Payment matrix of the participants in the ‘balancing’ game with example.
\r\n\t
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Dr. Tiefenbacher has published on a diverse array of topics that examine perception and behaviors with regards to the application of pesticides, releases of toxic chemicals, environments of the U.S.-Mexico borderlands, wildlife hazards, and the geography of wine. More recently his work pertains to spatial adaptation to climate change, spatial responses in wine growing regions to climate change, the geographies of viticulture and wine, artificial intelligence and machine learning to predict patterns of natural processes and hazards, historical ethnic enclaves in American cities and regions, and environmental adaptations of 19th century European immigrants to North America's landscapes.",institutionString:"Texas State University",position:null,outsideEditionCount:0,totalCites:0,totalAuthoredChapters:"1",totalChapterViews:"0",totalEditedBooks:"6",institution:{name:"Texas State University",institutionURL:null,country:{name:"United States of America"}}}],coeditorOne:null,coeditorTwo:null,coeditorThree:null,coeditorFour:null,coeditorFive:null,topics:[{id:"12",title:"Environmental Sciences",slug:"environmental-sciences"}],chapters:null,productType:{id:"1",title:"Edited Volume",chapterContentType:"chapter",authoredCaption:"Edited by"},personalPublishingAssistant:{id:"194667",firstName:"Marijana",lastName:"Francetic",middleName:null,title:"Ms.",imageUrl:"https://mts.intechopen.com/storage/users/194667/images/4752_n.jpg",email:"marijana@intechopen.com",biography:"As an Author Service Manager my responsibilities include monitoring and facilitating all publishing activities for authors and editors. 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Accordingly, considerable attention is being given to the development of novel strategies for the different nanoparticles of specific composition and size using biological sources. As the currently available techniques are expensive, environmentally harmful, and inefficient with respect to materials and energy use, so the emphasis is given to design the user friendly, non-toxic complexes, which can be used in biomedical and environmental applications. The major key prerequisite for achieving sustainability in the electronics industry is the usage of materials and technologies that have low embodied energy. Numerous efforts have been made throughout the world to develop environmentally benign technologies with nontoxic products using green nanotechnology and biotechnological tools. The synthesis of these nanoparticles using biological methods or green technology has diverse nature, greater stability and appropriate dimensions. So it is the current demand of the entire world to use specific techniques to characterize the potential of these hybrid complexes as an application towards drug delivery and biomedical fields. As we are focused towards Molecular electronics, so bottom up approach is included in this chapter, in which the individual molecular devices are built by synthesizing molecules with the desired electronic properties which are interconnected into an electronic circuits using attachment techniques like self-assembly. The main advantages of these complexes are their natural nanoscale structures, which can be created as absolutely identical in vast quantities and low fabrication cost [1, 2, 3, 4, 5, 6, 7, 8] (Figure 1).
Schematic sequence of processes in the construction of a commercial chip (image from official INTEL website http://www.intel.com).
The reason for green electronics arises as the elements used previously in the field of green electronics such as Pb, Cd, Zn, Cu, Cr and As are potential bio-accumulative toxins in the production system of milk and dairy products [9]. Cadmium cause bone demineralization, either through direct bone damage or indirectly as a result of renal dysfunction [10].
In contrast to the above, the application of nanoscale materials for electrochemical biosensors has been grown exponentially due to high sensitivity and fast response time [11, 12]. So we can say that there evolved a parallel study as nano-bio-complexes in the field of green electronics, blending the biomolecules and nanotechnology. These nano-biosensor designs have created revolution in the field which can become a pioneering research work. Recently hierarchical cluster analysis (HCA) and principal component analysis (PCA) [13] were used to assay the receptor signaling mechanisms which can be used in biosensors or nano-biosensors. The findings above lead to amperometric biosensor [14] based on enzyme from Brassica napus hairy roots to determine ochratoxin, is a colorless crystalline compound that is classified as pentaketides [15]. All biological molecules and cell organelles are chemo mechanically controlled systems known to every biologist. It is an interdisciplinary art to activate them to work as an electronic device [16]. Above all, developing an Immunosensor depends on immobilization of antibody molecules, which becomes an important factor for successful fabrication of immunosensors [17], which involves screen printing technology. Photoacoustic imaging technique has been developed which works on ultrasound spatial resolution and intrinsic rich optical contrast, penetrates deep into the tissues [18, 19] with acoustic ultra sounds and act as a detection tool in diagnostic medicine [20]. Thomas et al. [21], demonstrated all aspects of overhand throwing, using a 12 camera Vicon motion analysis system in a general motor program using bio-electronic signals. The synthesis from bioprocess or the material used as biomaterial, or the organism used for “GE” i.e. “Genetics Engineering,” or the sensor and the receptor in the field, there is a relation between each research studies; that is nothing but the field of biotechnology.
Molecular electronics (ME) deals intensively with a long term alternative for increasing the device density in an IC and continuing Moore’s law down to the nanometer scale. The basic idea of ME is to use individual molecules to act as wires, switches and memories. Till date, no detailed investigations have been carried out for various complexes using green technology, their utilization, or their analyses have been published. Therefore, this chapter is conducted to highlight the use of various nano-bio complexes, their use in green technology and different techniques for characterization of nanoparticles to provide a better understanding of the these sources to improve their uses in modern technology.
The ME can be further divided to (a) small covalently bonded organic molecules ((aromatic chains, conjugated polymers); b) large biomolecules (DNA, nucleoside-based aggregates, proteins); c) pure carbon aggregates (carbon nanotubes, graphenes).
The organic electronics based on conjugated polymers or small molecules as the core semiconductor element hold the high promise of delivering low-cost and energy-efficient materials and devices, yet the performance and stability of organic semiconductors remain major hurdles in their development as solid competitors of the inorganic counterparts. So the “soft” nature of carbon-based materials are considered enabling fabrication of extremely flexible, highly conformable and even imperceptibly thin electronic devices. In recent years, the graphene based nanomaterials have received considerable attention owing to their distinguished electronic and transport properties and act as promising candidates for electronics and spintronics. So green materials can act as emerging concept with carbon based class and integration of electronics into living tissue with the aim of achieving biochemical monitoring, diagnostic drug delivery tasks or generating human and environmentally benign technologies. Now the green technologies are carving the avenues towards achieving the ambitious goal of sustainability in the field of electronics. The quest is to achieve electronics sustainability by solving the energy deficiency puzzle and redressing the unfolding disaster, for which we look to the apparent simplicity of nature. Our aim is to create a novel class of engineered materials which are able to deliver complex functions that found applications in electronics; designing super-hydrophobic (lotus effect), super-adhesive (gecko effect) or self-healing surfaces. Nature is the most efficient energy consumption engine that can be used for infinite purposes. In the last 10 years, we have witnessed a great deal of effort towards the development of novel conductive materials (electrodes) able to interface electronics with biological matter to deliver recognize events (i.e. biosensing, bio-recognition) and the modulate events (i.e. tissue engineering). Here we have selected the larger biomolecules and pure carbon aggregates and their role in the field of green electronics.
The role of ME is to provide reproducible well-structured architectures, easy to wire in a programmed manner. Supramolecular chemistry seems to fulfill these needs [22]. The two properties which are attractive for this purpose is the (a) molecular recognition and (b) self-assembly. Molecular recognition is the capability of a molecule to form selective bonds with other molecules or with substrates, which rest on the information stored in the structural features of the interacting partners. Molecular recognition processes (a) the building up of the devices from their components (b) incorporate them into supramolecular arrays; (c) allow selective operations on given species (e.g. ions, dopants), and (d) control the response to external perturbations (e.g. external fields, light, electrons, other molecules, etc.).
The self-assembly has the capability of molecules to spontaneously organize in supramolecular aggregates under well-defined experimental conditions. Self-organization may occur both in solution and in the solid state, and make use of hydrogen bonding, electrostatic donor-acceptor effects (Van der Waals, dipolar, etc.) or metal-ion coordination as basic interactions between the components. Due to these two properties, DNA molecules seem particularly suitable to be used as components for the construction of nanometer scale devices [23, 24, 25, 26]. The idea of using DNA in molecular devices is its natural function of storing and coding the genetic information. DNA transmits well-defined chemical information through the pairing properties of the bases. In addition, it occurs in a large variety of structures and display physiochemical stability and mechanical rigidity.
The deoxyribonucleic acid (DNA) is a biopolymer in a double helical form, which is constituted by an extended array of aromatic π-stacked base pairs adenine-thymine (AT) and guanine-cytosine (GC) within a polyanionic sugar-phosphate backbone (Figure 2). Due to the biological implications, the studies about the charge migration in DNA were related to physiological processes: the possibility and efficiency of charge transfer is significant, because the migration of the radical cation is a critical issue to understand problems related to radiation damage and mutation [27, 28].
Representations of left (a) truncated octahedron containing six squares and eight hexagons. (b) Each edge of the truncated octahedron contains two double helical turns of DNA a DNA cube containing six different cyclic strands. Their backbones are shown with different colors.
The role of π-π interactions between stacked base pairs in double-stranded DNA could provide a pathway for rapid one-dimensional charge separation. Various experiments were performed to understand whether DNA facilitates the charge transfer over long distances and whether the base pair stack can act as a conducting medium. The issue of charge migration in DNA has recently become a hot topic with solution chemistry (in particular) after the first reports by Jacqueline Barton’s group [29, 30, 31, 32, 33] in the early ‘90s. Although the answer to the question: Is DNA a molecular wire? is still elusive.
The recent achievement is the construction of few DNA-hybrid devices, which requires the application of some state-of-the-art nanotechnologies are: electron beam lithography for the fabrication of metallic nanocontacts, trapping techniques to compel the molecules into the desired device scheme, Atomic Force Microscopy (AFM) or Scanning Tunneling Microscopy (STM) for imaging and probing samples.
The achievement of DNA-based devices requires [33]:
Construction of nucleic-acid networks.
Conversion of nucleic-acid (or DNA-protein) network into electron conducting system.
The DNA-based materials may be used either as conductive wires or as a template for other conductive materials. By exploiting the molecular recognition of its functional groups, it is possible to synthetize branched DNA-motifs that may be assembled into periodic arrays. Though a lot of research conducting in this field is giving the contrasting results.
The most important ones are:
The intrinsic properties of the different DNA molecules employed in the experiments, the length of the DNA (from a few nanometers to some microns) and the structural conformation of the double helix.
The properties of the buffer solution in which the DNA is kept and the presence and the concentration of counter ions;
The experimental conditions in which measurements are realized: in air, in vacuum, different humidity, and different temperatures (from 1 to 300 K);
The structural aggregation forms of DNA (films, network bundles, single molecules);
The presence of contacts and the effects of the DNA/electrode junction.
Apart from experimental difficulties in the fabrication of DNA-based device, several fundamental questions are still open: what are the interactions which control the electrical properties of DNA? How do they depend upon the sequence? What are the mechanisms for charge transport? What are the effects of dopants or defects? How does DNA attach to a metal electrode? What are the effects of the contacts on the conduction properties of the device?
DNA can be used in various applications in green electronics, which is discussed herein.
Nanowires known as G4-wires [34] (or quadruplexes), consist of stacked guanine (G) tetrads (G4). These one-dimensional polymers act as prospective candidates for bio-molecular electronics because, due to the low ionization potential of guanine (the lowest among nucleic-acid bases), they might be suitable to mediate charge transport by hole conduction along the helix, and have even been suggested as nano-mechanical extension-contraction machines [35]. In the presence of appropriate metal cations (especially K+ and Na+), solutions of homoguanylic strands in water [36, 37] as well as lipophilic guanosine monomers in organic solvents [38], self-assemble in right-handed quadruple helices. Recent investigations has been carried out for the G4-nanowires, but the conduction properties of these nanowires are basically unknown and a direct measurement of electrical properties of G4-wires is still missing.
Sensing and imaging of metal ions have attracted much attention by scientists and engineers because of the important roles of metals in many fields such as environmental, biological, and medical sciences. Significant progress has been made in developing sensors and imaging agents for the detection of metal ions, mostly based on organic molecules, peptides, proteins, or cells [39, 40, 41, 42, 43, 44, 45]. Prof. Yi Li has given a significant insight to the role of DNA as sensors and imaging agents for metal Ions [46], the structure of these systems is illustrated and described in Figure 3. DNA does not appear to be a good candidate for sensing metal ions with high selectivity because the negatively charged phosphodiester backbones of DNA are known to be capable of binding cationic metal ions with poor selectivity for any particular metal ion. While the four DNA bases can also serve as ligands for metal ions [47, 48, 49], many of these DNA–metal ion interactions are nonspecific and weak, making the use of DNA as sensors for metal ions very challenging because selectivity and sensitivity are required for the successful detection of a specific metal ion in the presence of other potentially interfering metals in complex samples. By incorporation of signal reporters such as chromophores, fluorophores, electrochemical tags, and Raman tags, these metal-ion-specific DNA sequences have been transformed into colorimetric, fluorescent, electrochemical, and Raman sensors and imaging agents for a broad range of metal ions with high sensitivity and selectivity [50, 51, 52, 53, 54, 55]. DNAzymes that is highly selective to use specific metal ions as cofactors to catalyze reactions can be obtained. In this way, DNAzymes that are dependent on bivalent metals for various chemical and biological reactions have been successfully discovered. One report of DNAzyme sensor was a fluorescent sensor for Pb2+ based on DNAzyme [56, 57, 58], which showed much higher specificity to Pb2+ over other metal ions in catalyzing the cleavage of DNA substrates with a single RNA linkage (rA) at the cleavage site.
a. General sensor design based on nucleic acid cleavage of DNAzymes for metal-ion detection. b. Fluorescent Ag+ sensor based on C–Ag+–C. c. Sensors based on G-quadruplex DNA stabilized by K+. Adapted with permission from Ref. [46].
These sensors can be further classified into different parts:
Fluorescent sensors based on metal ion-dependent DNAzymes
Fluorescent sensors labeled with fluorophores and quenchers [59]
Surface-immobilized fluorescent sensors [59]
Colorimetric sensors based on metal ion-dependent DNAzymes
Colorimetric “dipstick” tests using lateral-flow devices [65, 66]
Electrochemical and Raman sensors based on metal ion-dependent DNAzymes [67]
Hg2+ sensors based on T–Hg2+–T-containing DNA
Ag+ sensors based on C–Ag+–C-containing DNA
Sensors for K+, Pb2+, Cu2+, and Ag+ based on G-quadruplex DNA
Combination based sensors (DNAzymes and metal-binding DNA structure) [70]
Portable sensors [71]
In this category, new technologies have been developed to design sensors based on commercialized devices, compatible with portable devices, which could enable to monitor metal ions by all.
DNA biosensors are the integrated receptor-transducer devices that use DNA as biomolecular recognition element to measure specific binding processes with DNA, by electrical, thermal or optical signal transduction methods. The characteristics of DNA probes with the capacity of direct and label-free electrochemical detection find applications in rapid monitoring of pollutant agents or metals in the environment, investigation and evaluation of DNA-drug interaction mechanisms, detection of DNA base damage in clinical diagnosis, or detection of specific DNA sequences in human, viral and bacterial nucleic acids [72, 73, 74, 75].
Oxidative DNA damage caused by oxygen-free radicals lead to multiple modifications in DNA, including base-free sites and oxidized bases. The damage caused to DNA bases is potentially mutagenic [76] and can be enzymatically repaired. The interest lies in the sensitive determination and full characterization of the mechanism involved in oxidative damage to DNA bases. Electrochemical methods are used to study the DNA oxidative damage and in the investigation of the mechanisms of DNA-drug interactions. In recent study, it has been anticipated that the mispairs-coinage metal complexes can also be used as a biomarker [77].
The DNA-electrochemical biosensor enables pre-concentration of the hazard compounds which are investigated onto the sensor surface and in situ electrochemical generation of radical intermediates, which cause damage to the DNA immobilized on the electrode surface and can be electrochemically detected.
DNA has an optical response towards temperature, magnetic field, radiation and others. The flexibility of DNA can be modified by the radiations. When irradiated using gamma rays and neutrons (non-ionizing radiation), the dynamics of DNA macromolecules [78] changes its configuration when involved in environmental interactions with other components of the living cells [79]. Whenever any radiation passes through a semiconductor device, different effects are observed which depends on the range of energy of the particle (proton, alpha, neutron and both types of beta) and rays, such as gamma radiation [80]. These include defects as: vacancies, defect clusters, dislocation loops near the surface and adjustment of band gaps [81]. Electrical properties of DNA molecules can be understood by the electrical conduction mechanism, namely: thermionic emission, tunneling and hopping [82]. These all properties can be applied for DNA as radiation sensors.
Carbon Nanotubes (CNTs) has interesting physicochemical properties as electrical conductance, high mechanical stiffness, light weight, transistor behavior, piezoresistance, thermal conductivity, luminescence, electrochemical bond expansion as well as their versatile chemistry make them superb materials for a broad spectrum of applications ranging from energy storage devices, nanosensors and drug/gene delivery vehicles.
Carbon nanotubes (CNTs) are allotropes of carbon with a cylindrical nanostructure, a member of the
Representation of SWCNT and MWCNTs (armchair, zigzag and chiral).
Single-walled carbon nanotubes (SWCNTs) also have unique properties which make them suitable for applications in a variety of imaging modalities, such as magnetic resonance, near-infrared fluorescence, Raman spectroscopy, photoacoustic tomography, and radionuclide-based imaging.
The various features of carbon nanotubes are:
Physical cancer therapies delivered by CNTs [84]
Biosensing
Optical [85]
Electronic and electrochemical sensors [86]
Biomedical imaging
Scaffolds in tissue engineering
CNTs used as scaffolds in bone regeneration [99]
CNTs for neural applications
Representation of the role of CNTs in drug delivery. (a) Gene delivery by CNTs, (b) Normal drug delivery versus the efficient target drug delivery using CNTs.
The two-dimensional carbon material graphene find application for sensors, electronics and catalysis applications due to its exceptional electrical and mechanical properties. Some of these applications require the adsorption of metal clusters onto graphene and metal-graphene systems which are now become a subject of intense investigation. It show many interesting properties as the observable quantum Hall effect at room temperature [100, 101], existence of two-dimensional gas of massless Dirac fermions [102], ballistic transport properties on the sub micrometer scale [103], etc. As graphene is unique in nature, so researchers explore its unique properties in storage [104], spintronics [105], microelectronics [106], etc. A number of theoretical and experimental work have been carried out for the electronic and magnetic behaviors of dimers [107] and adatoms of different elements [108] adsorbed on graphene system, which have been found to yield many interesting results. Graphene also has immense potential to act as a key ingredient for new devices as single molecule gas sensors, ballistic transistors, and spintronic devices. Bilayer graphene, which consists of two stacked monolayers, has a quadratic low-energy band structure which generates very different scattering properties from those of the monolayer. It also presents the unique property i.e. the tunable band gap can be opened and controlled easily by a top gate. Another property of graphene is the high electronic mobility, which is crucial for many of its potential applications [109]. So, understanding the mechanism, which limit the mobility of carriers in graphene is extremely important. It is also of a high conceptual interest, since transport properties of chiral massless fermions are essentially different from those of conventional charge carriers in metals and semiconductors [110]. Charged impurity scattering has received the most attention [102], with the majority of studies modeling the impurities as point-like objects (1/r potential). Recently, it has been revealed in a theoretical study that the physical structure of the charged impurities and clusterization of charged impurities might be the an important factor, which influence their scattering properties [111]. Graphene nanoribbons (GNRs) present reactive edges which make GNRs not only more accessible to doping and chemical modification, but also more susceptible to structural defects [112]. In particular, for zigzag graphene nanoribbons (ZGNRs) terminated with one hydrogen atom on each zigzag edge, there are quite a few localized edge states near the Fermi energy level on both edges. Such localized edge states can lead to a spin induced energy gap [113] providing a significant effect on the electronic and transport properties [114]. The electronic and transport properties are thus very sensitive to the atomic structures and chemical modification of the edges. One of the natural ways of chemically modifying graphene is to include metal adatoms [115, 116, 117]. Motivated by the special transport properties of atomic wires of Al, Ag, Au and Cu, and inspired by the localized edge states of ZGNRs that greatly enhance the binding energy of adatoms, we also conducted the studies on (Al, Au and Cu) adatomed-objects on edge chlorinated nano graphenes to investigate the electronic, magnetic and adsorption and transport properties of these (C1 (C42CI18)/C2(C48CI18)/C3(C60CI22))–metal systems (Figure 6). Metals adsorbed on nanoscale carbon surfaces have been reported experimentally and theoretically to form a variety of structures, such as continuous coatings or discrete clusters [118] and novel interesting phenomena were observed to occur through suitable modification.
Potential adsorption sites and the most stable structures for Al, Au and Cu (dimers) on C1 (C42CI18), C2 (C48CI18) and C3 (C60CI22). Adapted from Ref. [117].
Metallic nanowires (namely, linear chains of metal atoms) have drawn significant attention due to the quantum confinement effect, as they represent the ultimate miniaturization of conductors. The nanoscales of metallic nanowires result in a number of novel and interesting phenomena different from their bulk materials [119, 120, 121]. Graphene based biosensors can be classified as follows:
Graphene-based electrochemical biosensors [122]
Graphene-based enzymatic electrochemical biosensors
Graphene-based bioaffinity electrochemical biosensors
Graphene-based DNA electrochemical sensors [123]
Graphene-based electrochemical immunosensors [124]
Graphene-based field-effect transistor (FET) biosensors [125]
Graphene-based optical biosensors [126]
In this chapter, we have discussed the role of DNA and CNTs in the field of green electronics. Metal nanoparticles and its interaction to the nucleobases and pure carbon aggregates are also described in detail. Current and future investigations of green nanotechnology will provide a more complete knowledge regarding various factors that influence green synthesis of nanoparticles and the most sophisticated technology that can be used for characterization of the synthesized nanoparticles for its more efficient future applications in environmental, optoelectronic and biomedical field.
“United Nations World Commission on Environment and Development” has stated that the sustainable development is established when humanity ensures its present needs without compromising the ability of future generations to meet their own needs. So the time has come when we have to bear the responsibility for the shape and type of environment our future generations will live in; a healthy environment, a non-toxic world. Right now the world is not what we have set up for the mankind. Since electronics has now become an indispensable part of our life- for us and our future generations. The natural and nature inspired materials allow the “green” technologies to achieve the substantial goals in the electronics field: they embody low energy and have biodegradable and biocompatible materials as their backbone. Now the time has started to imagine and explore the new possibilities of “Green” organic electronics.
Generalised and developed solutions to the problems of synthesis and ensuring the stability of the operation of automatic control and protection algorithms for a class of objects with a tunable internal structure. At the present stage of development, it is necessary to operate with information flows at a higher level of abstraction than traditional methods of building networks. The concept of information flow refers to a set of demodulated signal parameters from transient signals (transients) in an object. Connected network elements are considered as dynamic facilities (objects) of the control and protection (OCP). Within the framework of the smart grid concept, all the necessary algorithms for relay protection and automation (RPA) devices are in the foreground, and the equipment that controls the operation of the OCP (Figure 1) is at the second level. It implies the possibility of describing the properties of OCP electrical circuits through control algorithms [1, 2, 3, 4, 5, 6, 7, 8, 9]. Such a structural-informational (SI) method is developed by the author further [8, 9, 10, 11, 12, 13, 14, 15]. The methods of applying the available results of the SI method to describe the internal structure of high-voltage equipment of the OCR network are shown.
Unified circuit of smart grid Driver–EU–OCP.
In the traditional construction of networks, a great deal of experience has been gained in describing and calculating OCP [6, 7]. Usually it is enough to indicate the established terminology and mathematical description of the OCP in the technical literature [15, 16, 17, 18]. A method is necessary for describing the transient process in the OCP from the place of formation to the resulting text messages at a more abstract level, without loss of information and with the possibility of engaging the achievements of the traditional description. This allows a compact description of the problem and a focus on control algorithms [9, 10, 11].
The task was posed in a series of published works [7, 8, 9, 10, 11], based on the results achieved by improving recognition algorithms in devices for protection against single-phase earth faults in networks with a Petersen’s coil. Studies show [8, 9, 10, 11, 12, 13] that, for example, to maintain the stability of the operation of RPA device algorithms in distribution networks with a voltage of 6–35 kV, the amount of input information is insufficient [6, 8, 13, 16]. Faults are often and continuously present in externally operable high-voltage distribution networks, and information about the occurrence of such a situation cannot be distinguished during visual observation by the means currently available at substations [11, 13, 15]. Identification of the causes of situations is difficult and is associated with the lack of reliable information about the actual state of the network sections among consumers, configuration, state of high-voltage equipment, deviations in the technological processes of network load operation, etc. [15, 16, 17, 18].
Replenishment of the lack of information is drawn from the capabilities of intelligent search algorithms for pattern recognition, which are able to extract semantic states from transient signals occurring in networks [5, 8, 9, 10, 11, 12, 13, 14, 15, 16].
Further, when developing the SI method, the patterns of structural diagrams, which are stages in solving the problems of synthesis of automatic control and protection algorithms, are summarised in a general sequence [5, 8, 9, 10, 11, 12, 13, 14, 15, 16], namely, from information structures describing transients in a network, through a formal presentation of information in high-voltage network equipment, then dynamically changing network operating modes, to the synthesis of the necessary algorithms for structural processing of information in automatic devices.
The tasks of numerical assessment of the sufficiency of the signal information volume for automatic decision-making on shutting down a damaged part of an object are analysed (Figure 2). Algorithms for controlling the amount of information are implemented in the VCR, with built-in general purpose software information sensors and an arbitration function of RPA algorithms. The device is located in each OCP cell [7, 8, 9, 15, 16]. A method is proposed for obtaining the necessary additional information based on the sequence of steps of the SI method, namely, structured separation of information, control of the passage of elementary information components according to the structural diagrams of the control and OCP protection object, then through relay protection and automation devices RPA, and to the output of the SCADA control system [5, 11].
Diagram of a smart grid that is unique to a local measure and a signal S(t). T—RPA terminal.
Dynamic OCP management and control objects are those in which their internal information state develops sequentially in time, a new state replacing the previous one. We will call the elementary state the semantic situation SN, for example, S1 ‘normal operation’ or ‘NM’. One SN gives rise to another or many possible known developments. Such transitions to a fixed SN are similar to the operation of automaton models. A sequential change in time of the parameters, structure, dynamic properties and individual elements of the OCP is possible. The removal of sections from the OCP structure for various reasons or combining them into a common structure during the operation of automatic control devices is typical.
The OCP is characterised primarily by a change in time of the internal structure. Parametric changes are the result of such a change. For example, the task of adjusting the coordinate parameter L to changing the coordinate parameter C is successfully solved (Figure 3). Changes in parameter C result in changes of different types—(A) a change in the structure of the OCP by disconnecting the QN switches of the separated sections of the OCP; (B) there is a test change of the parameter L during operational work in the ‘NM’ mode, while the structure of the OCP does not change; and (C) the damaged section is disconnected by the QN switch by selective relay protection. In some modes of structural change, when damage occurs, blocking changes in the parametric coordinate L.
Structural scheme OCP (LZSC) with a Petersen’s coil L.
An analysis is made of the methods for describing well-known typical schemes of RPA systems to justify the possibility of operating with such a concept. So, on well-known typical schemes, a single-line OCP scheme, EU executive bodies, measuring transformers and the measuring part of the relay are indicated (Figure 3). The relay output was initially replaced with a multiple control result—from immediate shutdown to alarm.
In RPA tasks, the perturbation control principle is common. It is known that this principle is characterised by the presence of fatal errors and is relevant in the event of catastrophic failures in the OCP equipment. But most of the insulation damage to the network (75–98%), according to well-known statistics, can self-destruct. To do this, RPA algorithms must steadily determine such a transition process. Case studies have found that, in such SN situations, robustness of the RPA systems was not achieved.
The SI method is universal enough to describe various tasks and implement modern concepts of technology development [6, 7, 8, 9, 10, 11, 12, 13]. It consists of a description of the sequence of patterns as steps to solve the problem. The steps are due to the dynamic development of processes, control algorithms and moments of issuing control commands. Patterns are generalised equivalent structure (GES) schemes. They allow us to uniformly describe known and new devices within the framework of network development concepts (Figure 4). The GES scheme consists of automata A—morphological MorphA, syntactic (SyntA) and semantic (SemA). The SyntA machine controls the correct sequence of primary terminal symbols (TS) in the TS chains in the input information. SyntA states are nonterminal symbols (NTS) that appear when TS chains are known to SyntA recognition engines. The basis of GES circuits is the sensing S-detector introduced. It detects the semantic signal S(t), which is formed sequentially in the GES schemes of the object, recognition and control algorithms and is used at all hierarchical levels of information processing.
Diagram of the GESASNOM of system stabilisation ASNOM based on SSMART(t).
The quality of processing dynamic information flows in RPA systems in energy networks is controlled by the semantic signal S(t) (Figure 4). Such a signal is formed at each hierarchical level of processing the total amount of information in the system—morphological, syntactic and semantic. The amount of information about the state of the OCP is allocated and controlled by RPA devices based on demodulation of the information components in transient signals (Figure 5).
Formation of a signal with an S(t) signal—maximum amount of information.
The relationship of TS and NTS in the GES scheme is described by the rules P. Rules P are divided into groups of selectivity PS and blocking PB. Rules P are assigned weights KSN and KBM, according to the contribution to the overall semantic output SSMART(t). So, the information part of the S-filter is highlighted. The SemA output generates a semantic signal SSMART(t) = For(t)–Against(t) (1). The SSMART(t) signal reflects changes in semantic information in the OCP and in the system of automatic stabilisation of the normal operating mode (ASNOM) of the network (Figure 4).
where N = 1, 2, ...; M = 1, 2, ...; Σ is the sum of all weight coefficients KSN or KBM, which establish the significance of the rules PS and PB of the SyntA automaton and the weight coefficient KSSB of the resulting root rule PSSB of the SemA automaton; and β is the general scaling factor. The FIX function describes the operation of the fixation unit, in which, during the development of transients, the activated rules PS and PB are stored for a while to accumulate the SSMART(t) value. This signal can vary between ‘0%’ and ‘100%’ (Figure 6). The FIX function is similar to the operation of the emergency recorder and acts when the ‘activating’ TS appears, which is set in the settings of the RPA device. Such a TS is commonly known for OCP.
GESCOMAND scheme. Illustration of change of a signal S(t) and thresholds ρN.
The GES scheme is mathematically described by a list—grammar G as shown in Eq. (2).
where O are objects, for example, OCP, GES, TS, RPA, ASNOM, SCADA, PS and PB—the rules for connecting TS and secondary NTS—and PSSB is the resulting root rule of the GES scheme. The executive bodies EU of the ASNOM system (Figure 4) are the outputs of the RPA algorithms, combined by the block of the ExS expert system. The final semantic conclusions are formed in ExS, and decisions are made on the automatic removal of deviations from ρ1 ‘NM’ of the normal mode (NM) of OCP operation.
The OCP is presented on a single information field of elementary information components of TS. From these TS, an SN formation tree, a TS terminal symbol tree describing the SN structure and signal control SOCP(t)are built.
The SI method allows you to describe SN semantic situations by passing them through the GESOCP information block diagram. This is controlled by the sense signal S(t). Its area (otherwise, power in the interval of control duration) can be considered the meaning of events in the OCP circuit (Figure 5). By the amount of information that is formed in the structural diagram TS, we mean the area S(t). The authors of [6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16] studied the construction of a tree that recognises systems in RPA devices based on the generation and control of the SRPA(t) signal. The SRPA(t)signal in recognition algorithms controls the course of processes in the OCP in meaning. General control of all OCP loops is performed similarly within the framework of the ASNOM and SCADA systems with the corresponding GASNOM, GSCADA grammars and SASNOM and SSCADA signals (Figure 4).
Thus, the structure of the OCP can be described by a set of GESRPA schemes, i.e. the sum of Σ components and their GO grammars, namely,
The OCP objects are managed within the ASNOM system (Figure 4). Stabilisation is achieved by the criterion of the minimum deviation of the power of the semantic signal S(t) from the setpoint of the ‘normal mode’ system. The class of objects is controlled by issuing commands to the RPA device. The formation of commands is controlled on the time axis of the emergency file as a reaction of the recognition algorithm to the input signals from the OCP.
Figure 6 shows the GESCOMAND diagram as a command generation template in the ASNOM system. Teams manage not only the settings but primarily the structure of the OCP. Therefore, the ASNOM system differs from adaptive systems, which are characterised by a change in the parameters or structure of the controller depending on changes in the parameters of the object or external disturbances.
The operation of technological and other processes in the network is considered further along the OCP–SCADA chain, where GSCADA = ΣGASNOM (Figure 4).
Identifying the site or location of damage in the OCP from the indicated types of damage is a difficult task to put into practice (Figures 2 and 3).
Selective relays from the main phase to ground faults are separately available in large numbers. Relays are widespread but are characterised by instability. By device stability, we mean the quality of recognition of SN semantic situations in transient signals in the OCP, which is necessary for the correct operation of devices in the ASNOM system. To ensure the stability of the relay protection and automation devices, it turns out that in some cases the traditional choice of the settings for the operation of these devices is not enough. The same type of device with the same algorithm is installed in different networks. In each network, high-voltage equipment has its own specifics and operating history, exhaustion factors, etc. Therefore, it is possible to have complex interfering extraneous signals at the installation sites of devices that are present for long periods of time and for which the use of devices is not designed.
The flow of information develops sequentially in the object and can be interrupted and resumed for various reasons. This property of the object during operation can lead the ASNOM stabilisation system to instability.
Studies show that recognising RPA algorithms is often built on the analysis of only one or several SNs [16, 17, 18]. In the remaining SN, the algorithms are blocked during the development of damage to the OCP and do not recognise the change of SN and SN scenarios. In this case, the available information is not used. However, the change of SN and SN scenarios allows one to highlight this additional information and use the additional rules of the DOP in recognition algorithms (Figure 4).
The reasons for the instability of the work are insufficient information to make a decision on the management of OCP, the similarity in structure and content of the main situations of SN with interference and unrecognisable SNs. It was revealed that volume restrictions may be a consequence of: (1) minimisation and shortcomings of synthesised recognition algorithms; (2) the influence of various conditions of specific sections of the network when introducing devices with the same methods; and (3) the lack of redundancy in the reception and processing of signals. It is known that redundancy of information allows you to work with distortions, extraneous signals, interference and more. This requirement may not be implemented, despite the fact that the amount of information should correspond to the complexity of the task. We will consider ways to address these causes of violations of the recognition of dynamically changing information.
If, when modelling in CAD on a joint model of information sensors TS and an object, it turns out that the signal S(t) does not track the gradation of changes in the transient in the OCP and changes roughly, without distinguishing close SN situations, this is a sign of insufficient information for recognition. For the success of solving the recognition problem, it is necessary to provide a sufficient amount of information. If it turns out that it is necessary to use the internal coordinate of the object, then it is necessary to ensure the formation of such information. To do this, an additional TS sensor is needed for direct or indirect information acquisition.
Studies show that a residual amount of information is present in the situation recognition tree [16, 17, 18]. Information is captured by the FIX unit and evaluated by other algorithms. In the case of continued development of the processes in the OCP, algorithms for additional recognition of information in the DOP block are involved (Figure 4). Additional algorithms are also used to clarify the recognition and completion of the amount of information as well as for self-monitoring and partial diagnostics of the object, evaluating its performance, equipment and algorithms that make up the ExS expert system.
The purpose of further study is to obtain an additional amount of information from the OCP for its use in the GESRPA recognition tree to increase the stability of RPA algorithms. To do this, the passage of the elementary component of interest is tracked along the template structures, which are the GESOCP, GESSN, GESASNOM schemes, a separate SN situation, a scenario of SN changing in time and a tree of possible SN developments. It can also be considered from the place of origin to the exit to the OCP through the coordinates of the OCP to the input of the recognition system and then according to the patterns of the GES schemes to the control system output of interest (Figure 4).
There are several types of description of object models OCP:
Only by electrical parameters. The description of the models is based on the coordinates of currents, voltages, conductivities, etc. It is typical for him to study the parameters of movements in time using mathematical dependencies and identification by RLC elements [7], performed on the basis of functional modelling (integration of differential equations). Each test impact leads to a transient in time. A general solution is sought as attractors and hodographs of unit calculations. But these methods do not eliminate the fragmentation of the obtained results, the loss of compatibility for high-frequency components (HFC) and super-slow information (s-LFC) and informal empirical data preparation. Therefore, most RPA devices have been developed by heuristic, expert methods.
A structural-operator (SO) method. It establishes a connection between electrical and information parameters [7]. It is used to describe network circuits as a control object and control algorithms for the network zero sequence circuit. However, when solving related problems, namely, RPA, it turned out that the means of this method are not enough.
A structural-informational (SI) method that works only with informational semantic components. The establishment of interconnections between elementary information components (terminal symbols, TS) is considered, which can be detected from electrical parameters. The movements in dynamics are considered, similarly to the automaton model, as transitions between states. Modelling leads to visual methods for displaying the results in the form of attractors and hodographs. Equilibrium points of solutions can be found by the game theory method. This allows you to work with electric power OCP on a more abstract level. The use of the SI method of pattern recognition removes such restrictions on the processing of only information without the participation of parametric components.
Studies show that the first two methods for describing OCP models are limited to obtaining a parametric OCP control system.
Fuzzy logic and neural network methods are well known. Common to these methods are the following actions: the decomposition of information into elementary components; multiplication by weights; summation of the result; and comparison of the result with many threshold values. However, the extent to which these methods are used is limited by the specifics of the tasks they are to solve, for example, the dynamic development of the transition process in an OCP.
According to the SI method, the OCP structure is represented by transient signals [11, 12, 13]. The description is based on the fact that the total amount of information is supplied by all of the oscillatory circuits. These circuits constitute the OCP (Figure 7). Such an OCP model allows one to operate only on semantic components while improving RPA device algorithms. The OCP also appears to be a list of SN semantic situations.
Equivalent structural scheme of GESOCP with division of movements by frequencies.
An SN situation is understood as a dynamic change in the output of the OCP block diagram as a reaction to the appearance of changes at any point of the OCP (input or internal) [8, 9]. That is, the SN modulates the industrial frequency signals in the OCP. Demodulation of the signals makes it possible to recognise the SN situation among the well-known and rather limited number of SN. Recognition is performed by automatic machines (A). Cases of a complex, simple SN situation and dynamic SN change [9, 10, 11] are taken into account. The signals at the output of the OCP are characterised by the consistent development in time of information components. These components are distinguished by information sensors [8]. The sensor outputs are terminal symbols and are grouped in TS chains. The totality of a TS is a morphological automaton (MorphA).
According to the SI-method, all available information about the OCP is monitored. First of all, the OCP is replaced by oscillatory circuits with the corresponding frequency components (FC), that is, from the HFC to the super-LFC (Figure 7). Low-quality contours, in which only one half-wave of oscillation develops, are also vibrational. It is known that in RPA and SCADA devices, input information is sampled by time in the ADC block. The sampling frequency of the ADC is selected based on the presence of the highest-frequency component in the OCP. So, the ADC block will fix in the input signal all the components with a lower natural frequency (i.e. all the LFCs). So with the well-known operator description of the OCP, y(t) = W(D)*x(t). Constants in W with indices n and m describe the highest frequencies with which movements in the OCP are possible. We assume further that for the ADC, these constants aN, bM will be the initial a0, b0. Then all other frequencies in the new W will be slower; therefore aN, bM will be the slowest s-LFCs. This allows us to provide a description of the OCP transfer function W for the highest-frequency component, which can be recorded by the ADC. You can control all the slow oscillatory circuits of the OCP. Very low-frequency motions may be present in the OCP. The lowest-frequency components and movements in the OCP can be considered informational (Figure 7).
This record allows you to highlight the presence of super-LFC in the OCP using the signals of emergency files of RPA devices. Such frequency components are generated in the OCP (Figure 7) by input shock effects of overvoltage, short circuit, OPG, operational switching, etc. Motions in super-LFC circuits of the OCP can be in different time ranges—second, monthly, annual and so on, for example, envelope industrial frequency response (e-LFC). e-LFC mathematically summarises signal circuits in OCP. s-LFC is only an information loop.
The OCP structure is represented by the GESOCP scheme in the common field of TS information sensors that recognise SN situations. Each SN is divided into elementary components—nonterminal components of NTS. Information components are controlled by a logical change in TS outputs. For example, the amplitude parameters of the signals of the OCP loops are monitored and represented by the corresponding TS. Each OCP oscillation circuit is controlled by RPA devices. Devices at a morphological hierarchical level will be further represented by a GESTS scheme with a GTS grammar (Figure 9).
Extending the discussion about the presence of information loops to the features of higher-frequency loops, we can separate the signal description of processes in the OCP from the information description of the essence of the processes. This implies the task of searching for vibrational components in the ranges of the LFCs of super-LFCs by means of analysis in CAD of the frequency components of the alarm file signals. Solving the problem of separating parametric and information loops will help fill the lack of information when recognising SN situations in OCP.
It is proposed to implement the stable working of recognition devices based on an algorithm for the selective search (SP) for a sufficient amount of information to perform RPA functions. The amount of information is accumulated based on the control of a number of information components, for example, the type of damage, the steadiness of the development of damage, the location of the damage, the presence of selective and blocking signs for damaged and undamaged areas, the absence of extraneous semantic situations, etc.
Further, attention is paid to the formation of OCP grammar for the tasks of improving the algorithms of RPA devices. It is necessary to develop consistent structural trees of OCP and RPA with respect to the semantic signal S(t) as well as a method for the end-to-end mathematical description of transients in the ‘network equipment-RPA devices’ hierarchical chain in the automatic control system (Figure 4). This is part of the developed SI method.
The SI method is based on the application of sequential graphic transformations from a circuit diagram based on electrical parameters and the transition to a circuit based on information components. The structural-operator method is involved for the formal description of the OCP by parametric components [7]. Then the transition to the description of the SI method is carried out only by information components. The transition is performed by introducing terminal symbol sensors at the control points of the OCP scheme (Figure 9). In the internal OCP scheme, these can be imaginary points, since most of the structure of the OCP is not divided into control parts.
For example, Figure 8 shows the SO description in the form of electrical parameters of one of the elements of the OCP—transformer. Information flows are generated by inertial fields and are described by the operators D = d/dt, 1/D = S. The input to the circuit is the coordinate of the perturbation signal SN(t) for OCP. According to the SI method, at each control point of the circuit, the output of the elementary transfer function must be monitored by the TS sensor with the corresponding weight coefficient. TS consists of a GESTS scheme. It includes a filter and a threshold element ρN. The TS acts as an observer for the operation of the structural-operator diagram of the OCP. Naturally, this is an imaginary and often unrealisable scheme in connection practice. But the implementation of such a solution is performed in CAD. This makes it possible to implement a theoretical description of the OCP scheme. In OCP, all TSs are combined into a more general S-filter, which generates the signal SOCP(t) and is controlled by the threshold ρN. Thus, a rigorous mathematical description of the OCP is feasible.
Hardware example diagram.
This allows you to build a mathematical model of OCP in CAD for the selective search algorithm SP to reach the maximum amount of information. Functional modelling in CAD will provide an additional amount. The passage of the informational components of the SN semantic situation through the structural-informational models of electrically connected equipment (Figure 8) of the OCP using the signals of real emergency files supplied by modern devices is simulated. If theoretically and practically received amount of information from real OCP is sufficient for recognition, then the problem is solved by practically recognisable algorithms. OCP is observed and controlled by recognition algorithms. If the theoretical amount of information is not sufficient for distinguishing SN and making decisions in particular cases or in the general case, then indirect methods of detecting errors in management are necessary.
GESOCPscheme description. The structural tree of SN→TS formation for the OCP uses the internal coordinates and OCP contours not observed by the GESRPA device circuits (Figure 9). The construction of the GESOCP scheme proceeds from three foundations:
Structural-operator description. We will compile descriptions of the OCP and high-voltage equipment based on Figure 9. We will divide the description elements into alternative streams ‘For’ and ‘Against’ in relation to the formation of the OCP output.
Separation of movements by frequencies. We transform the structural-operator description of the OCP to the canonical form of a digital filter with an infinite impulse response (IIR) according to the rules of structural transformations (Figure 10). This possibility follows from the theory of filtration, according to which any inertial model can be described by an IIR or FIR filter. We will focus on the ‘central’ elements of the GES scheme. The ‘Cons’ group includes flows initiated by the UOUT output and arriving with a minus sign at the central internal adder. The elements of the ‘Cons’ group belong to the Filter block on the basis that the Filter passes only a selective signal.
Mutual grammar mapping of GOCP ≈ ΣGRPA. In the OCP structural models obtained, when the situation is S1 ‘NM’, the output information stream ‘balances’ the input stream. If the ‘balance’ is violated, a transient occurs in the OCP. The transition to a new state of the SyntA automaton occurs as the transition process develops and is determined by the SN situation. Since the physically non-separable design of the OCP and equipment has its own movements, the IIR filter scheme is more consistent with the OCP scheme.
Structural schemes of ownership, prompted by the operator method.
GESOCP scheme for dividing SN situations into elementary components of NTS.
The OCP model is built on the basis of a bundle relative to the internal adder. In the IIR filter scheme, each rule P is assigned a weight coefficient KN or KM (Figure 10). In the structure of digital filters, the inertia is set discretely by the SyntA structural automaton, and the dynamic behaviour of the filters (their own transient process) depends on the information received from the input and from the output of the OCP circuit. The GOCP grammar differs from GRPA in (2, 3) in that its elements have an oscillatory, harmonic output, while GRPA elements have a threshold output.
Separation of movements by frequencies: The OCP representation is introduced as a description of the GOCP grammar, including a list of SN situations (root S characters). SNs are interconnected by the semantic rules of PN (Figure 11) and characterise the work of OCP. In turn, the SNs themselves are represented by semantic information components (terminal and nonterminal symbols) and the PN rules of their relationship. Thus, the lists of the grammar G and the GES schemes form the semantic model of OCP, composed of semantic components. The start and end vertex is the SN ‘NM’ situation.
Scheme of the ‘GESOCP by the SN situation’. Shaping SN and signal situations S(t).
By dividing the movements according to frequencies, we mean to clarify the number and parameters of the oscillatory circuits in the OCP (Figure 7). Based on the descriptions obtained by the structural-operator method [7], it is possible to represent the structure of the OCP definition tree in the form of the relationship of a number of oscillatory or inertial circuits (Figures 7 and 9). The method of dividing movements by frequencies from the point of view of the SI method is as follows.
According to the SI method, when frequency motions are divided, all the frequency circuits of the OCP are controlled [9, 10, 11]. If the selective GESRPA part (synchronous detector) controls one circuit (Figure 7), then the blocking part of the GESRPA monitors the other circuits. For information to appear in the slowest OCP loop, a series of events in the transition process must occur, and a sufficiently large amount of information should have accumulated. But the goal of the RPA is to minimise the development of events in the OCP. As a result of this, movement in super-slow circuits rarely occurs; the appearance of transient information in the OCP can be interrupted. This leads to the indicated conflicts ‘a’ to ‘c’.
For the OCP scheme: (A) The number and parameters of the oscillatory circuits in the OCP are determined from the mathematical descriptions and signals of the emergency files (Figures 7 and 8). (B) An OCP is drawn up in the form of an IIR filter (Figure 9). (C) The GESOCP scheme is compiled in the form of an FIR filter as the inverse of the GESRPA scheme according to GOCP ≈ ΣGRPA relative to ΔSN (Figure 10). (D) The elements MorphA, SyntA and SemA stand out in GOCP and are implemented in separate computing parts. (E) WTABL is filled out to represent the OCP. Training and supervising samples of SN situations are formed.
Such a volume of simultaneously solved problems leads to a limited capability to divide movements by frequencies for modelling in the OCP and solving smart grid problems.
Separation of movements by meaning: Further solution of the problems leads to using the method of separation of movements by meaning [9, 10, 11]. We will understand the separation of the dynamic flow of information into hierarchically subordinate structural elementary parts and the operation of these parts (Figures 10–12). Additionally, the division into alternative information flows ‘For-Against’ is performed.
Tree scripting SN in dynamics by signal S(t).
The relationship of the methods of separation of movements: The separation of motions in frequencies determines the structure of oscillatory motions in the OCP (Figure 7), but the meaning of these motions is determined by the division in meaning (Figure 10). To clarify the relationship of the methods, an analogy can be introduced. The method for separating movements by frequencies describes the relationship of all the available circuit elements. This description is located within a single plane. At the same time, the LFC processes take up the resources of the computing system while the HFC processes are being calculated. The method of separation of movements by meaning represents the relationship of the elements in the circuit, not in the plane but in space [11, 12, 13].
Within the framework of the SI method, we can talk about the method of separating movements by frequencies as an additional preliminary hierarchical level of the method of separating movements by meaning. The application of the above methods can be as follows—structural-operator, identification, separation of movements by frequencies to describe the OCP and then the SI method with structural-morphological, structural-syntactic and structural-semantic steps.
The parameters of the electrical signals are only the SN carriers. The characteristic features of the input coordinates of the RPA are the natural spatio-temporal sequence of consideration of the information components. The SI method is applied to the description of the OCP. All SN components are located in a certain way relative to each other and relative to the general synchronising time axis [10, 11]. The semantic information about the state of the OCP can be represented in the form of separate elementary SN situations. Each SN characterises the corresponding known (classical) state of the OCP. The problem arises of separation of the information set of states and recognition of the SN. In the limit, SOCP(t) can be specified by a single SN. This becomes the minimum information for building an OCP model, which reduces the time required for a single calculation in CAD.
The OCP scheme can be in dynamic consideration in one of the semantic situations of SN. Suppose that S1 ‘NM’ corresponds to the steady-state values of the OCP internal parameters (operator outputs, NTS symbols, P rules). Thus, the concept of semantic situation SN means the appearance of the reaction ΔUOUT of the OCP structural scheme in response to a change in Δ in any OCP coordinate. We also understand the structural, logical relationship of the individual TS control points in the structural-operator model of the OCP or equipment that form the transient signals (Figure 9). And also SN means a part of the OCP formation tree with activated root symbols PS, PB, then NTS and TS. The steady state of the OCP parameters can be distinguished and named SN. By the SN situation template is meant the sequence of characters PS, PB, TS, NTS of the OCP tree established for this SN, which is formally described by the GOCP grammar. Thus, it is necessary to systematise all SN situations. These SN definitions are based on the OCP. The definition of SN relative to RPA devices is introduced as an analogy—each SN corresponds to a stencil with the corresponding sequence of ‘selectivity windows’. Compilation of the OCP generation tree can be planned using the table transfer function WTABL = TSN/SN [9, 11]. WTABL is populated based on emergency files as well as by calculating OCP models and GESRPA schemes in CAD.
The SN tree consists of a series of SN, replacing one another in time logically sequentially as the transition process develops (Figure 12). A scenario of SN development is formed.
A special role in the operation of the OCP is the situation of SN ‘NM’. Although this SN does not apply to single-phase insulation faults to ground (OPG), it is from this that it begins, and it ends with its analysis of the transient into semantic and structural-informational components (Figure 13). The normal SN mode includes: (a) SN ‘NM’ itself; (b) SN ‘processes not related to OPG’; and (c) SN ‘neutral displacement’, caused by the exceeding the normalised levels of emergency situations and resulting from the operation of the technological equipment of the distribution network.
Structural schemes of GESSN semantic situation SN in OCP by signal S(t).
Characteristic SN situations can be highlighted (Figure 12). The initial OPG breakdown (the first damage to the network insulation until a pronounced neutral reaction of the network), then the network reaction to the initial breakdown, subsequent OPG breakdowns and the restoration of SN ‘NM’ after OPG elimination are different stages of the transition process, of which OPG is a particular case. Of these named elementary SNs, the ‘GESOCP by SN situation’ formation tree is composed. Recognition algorithm in RPA devices restores exactly such SNs, SN scripts and SNscript tree. Therefore, the description of the OCP obtained by the SI method should return all possible relationships in SN in the SN tree.
In the dynamics, a sequential change of the elementary SN occurs. As a result, a scenario for the development of the SN appears. The OCP can be in one SN state for a long time (e.g. SN ‘NM’, SN ‘metallic OPG’, SN ‘skew’), for a short time (SN ‘metallic’) or very briefly (SN ‘first half-wave OPG’). Scenarios of SN development can also be sequentially described by the logical change of certain elementary SNs. Such scenarios are typical for OCP and should have their own names (e.g. SN ‘intermittent arc’, SN ‘self-eliminating multiple breakdowns’). In RPA algorithms, such SN scenarios are restored at a semantic level of recognition. It is possible to create an SN transition tree (Figure 12). Both mutually inverse formation and recognition trees make up the ‘GESOCP scheme for the SN situation’. We can distinguish ‘GESOCP along oscillatory circuits’ schemes for considering the separation of movement and a ‘GESOCP scheme for SN semantic situations’, which shows movement in the meaning of SN situations.
Thus, the recognition algorithm determines not only the SN situation but also the essence of the transition process in the OCP. At this recognition level, a significant part of the non-selective operation of RPA devices occurs due to the limited or lack of appropriate PN rules in RPA algorithms.
The task associated with RPA and OCP management has the peculiarity of intersecting SN semantic situations. Generally speaking, in order to increase the stability of the operation of RPA algorithms for each area of overlapping situations SN, it is desirable to define its own information sensor TS. The more it is necessary to determine the current SN, the greater the number of TS that should be laid in the structure of the algorithms. Reducing this intersection is the ultimate goal of a theoretical description of the OCP. For this, according to the theory of information, it is necessary to supply an excessive amount of information for rechecking, determining errors and recovering information from errors for a recognition system. In practice, the implementation of this important property does not occur. This leads to recognition errors.
In a real OCP, there are third-party processes unrelated to typical SN situations and SN scenarios. These may be present for a long time and be registered by some TS in the RPA. They need to be discovered and their named list compiled. Formation can be in CAD based on mathematical functional modelling, with real emergency files. In the presence of a generated mathematical model of the OCP or individual equipment, it is possible to introduce situational changes from the signal source at a certain moment during the transition process, which interfere with SN ‘NM’, for example, by short-circuiting or shunting a single element, or a series of elements in the structural-operator model of OCP, or equipment (Figure 8). This leads to observable transients. Similarly, it is possible to repair the cause of damage through transient signals in real emergency files.
The combined scheme in Figure 14 allows one to obtain a high-quality SN recognition model in view of the mutual reflection of GOCP ≈ ΣGRPA and the possibility of comparing SOCP(t) and SRPA(t). From a comparison of the parts of Figure 14, it follows that the synchronous detector is a ‘central’ element in the GESOCP scheme. It is known that a synchronous detector consists of a comparing element based on the multiplication or summation, a zero component filter and a threshold device. The filter turns out to be feedbacks from the UOUT output to the common adder. When replacing the elements covered by feedbacks in Figures 7 and 10 with the transfer function, a more general OCP scheme is obtained in the form of a unidirectional SN→TS formation tree (Figure 14). The scheme makes it possible to solve modelling problems and smart grid information tasks [7, 8, 9, 10, 11, 12, 13, 14, 15, 16].
Structural schemes of GESOCP and GESRPA by signal S(t) and GOCP ≈ ΣGRPA.
The minimum information for constructing an OCP model are two elements of the iOCP information part—a selective TS and a blocking TS. Also, the bundle—the signal source SOCP(t)and the controlled frequency generator—will be the minimum OCP model [11, 12, 13]. The generator can have amplitude, frequency and phase modulation of the output signal from the super-LFC to HFC range, depending on the problem being solved. Such OCP models minimise the time required for a single calculation. Thus, models of the OCP, RPA devices and S-detector were built. The SOCP(t) recovery algorithm from the OCP model can be used to decrypt the accumulated emergency files (Figures 11–13). For this, models of the ExS expert system and the diagnostic message generator are used (Figure 4).
A ‘balancing’ task arises when considering GES schemes (Figure 14). According to GOCP ≈ ΣGRPA, it is possible to set the ‘balance’ task for the GESOCP scheme as well. The solution of the ‘balancing’ problem is a development of the theory of the SI method [8, 9, 10, 11]. A numerical determination of the equilibrium point of GES schemes is proposed when considering the ‘For-Against’ problems for OCP and ‘selectivity-blocking’ using the game theory method [14]. The result is compared with the published solution through the method of dynamic functional modelling [11, 17]. This section briefly discusses the algorithm for solving the problem, designed in the form of a computing module. The problem when using computational modules is the possibility of a multivariate interpretation in the formulation of the problem and in the analysis of the results. The following aspects of the problem have emerged—(a) the need to be an expert in the specific problem being solved; (b) being sure of the possibility of using the module to solve the particular problem; and (c) it requires the presence of training and supervising samples of real semantic situations for testing and verification of results. Experience of using the module can be gained on the basis of modelling in CAD.
In the ‘balancing’ game, the competitors are the two root weights, KSS selectivity and KSB blocking, where the corresponding root characters are SSS and SSB. The contest is won (victory) V, when there is a clear victory for KSS or KSB—the correct operation of the threshold element ρN. It is lost L if there is ‘error excessive response ρN’. The competitors have the following features, aimed at implementing the requirement to increase the stability of RPA devices in complex SN situations. The KSB blocking group always fights ‘compete KSS and KSB’ until they win: ‘The SSB(t) signal is greater than SSS(t)’ of the blocking group and retreats with ‘error excessive operation ρN’ in the case of serious injuries, with ‘error excessive failure ρN’. The KSS selectivity group is limited by the threats of winning: ‘The SSS(t)signal is greater than the threshold ρN’; however, if it gets to a ‘complex SN’ bout, the selectivity group recedes, with ‘error excessive ρN failure’.
Thus, there are four game options. These appear more pronounced in a difficult SN situation, when there is little information for the correct operation of the threshold element ρN. The results of the game are evaluated in the form of arbitrary units (points) received or lost by the participants.
In the ‘grammar G of one of the devices’ population, we denote the share of the blocking group with z, and then the fraction of the selectivity group will be 1–z. If two competitors KSS and KSB are randomly participating in a ‘one of the SN situations’ clash, then with a probability of z × 2, they are two KSB; with a probability of (1–z) × 2, they are two KSS; and with a probability of 2 × z × (1–z), they are KSS versus KSB.
Let us designate the parameters of the ‘balancing’ game as damage from injury W, ‘error excessive failure of ρN’ and energy consumption E for the opposition ‘operation-failure of ρN’. We will assume that in the ‘balancing’ game, the winning ‘correct work ρN’ is estimated as follows (Table 1)—victory V = 75 points, loss L = 5 points, damage from injury W = 150 points and energy consumption for opposing E = 5 points. Let us find the average number of points that competitors KSS and KSB get as a result of the ‘one of the trainings SN’ fight. The results of the ‘balancing’ game can be visualised in the form of a payment matrix (Table 1). Based on Table 1, on average for the blocking group, we get
← | ↓ | Selectivity, 1–z, For, (Doves, D), KSS | Blocking, z, KSB, Against (Hawk, H) |
---|---|---|---|
SD(z) | Selectivity, For (Doves), KSS | S(S,S) = (V–L)/2–E S(S,S) = 30 | S(S,B) = −L S(S,B) = −5 |
SH(z) | Blocking, Against (Hawk), KSB | S(B,S) = V S(B,S) = 75 | S(B,B) = (V–W)/2 S(B,B) = −37.5 |
Payment matrix of the participants in the ‘balancing’ game with example.
SB(z) = SH(z) = 0.5 × (V–W) × z + V×(1–z) = V–0.5 × (V + W) × z = 75–112.5 × z.
Similarly, for the selectivity group, we get.
SS(z) = SD(z) = −L × z + [0.5 × (V–L)–E] × (1–z) = 0.5 × (V–L)–E–[0.5 × (V + L)–E] × z = 30–35 × z.
The graphs of these equations in the S–z coordinate axes are shown in Figure 15. As can be seen, the winning lines ‘correct work of ρN’ for the groups selectivity KSS and blocking KSB intersect at the equilibrium point Ω defined by the relation:
Graph of the winning line of the participants in the ‘balancing’ game.
Ω = 75–112.5 × z = 30–35 × z, z = 45/77.5 = 0.58.
In Figure 15, we choose the reliability point zRELIABILITY = 0.8 × z = 0.8 × 0.58 = 0.464. At this point, we put SS(z)/SB(z) = KSS/KSB. The ratio kR = KSS/KSB = 13.76/22.8. Then.
KSS = kR/(kR + 1) = 0.356, KSB = 1/(kR + 1) = 0.624.
An object is considered to be managed when it can be transferred from any initial state using an input action to a given state within a finite time. In this case, the ASNOM system stability requirement must not be violated. Stability of operation is understood as the ability of the system to return to the initial SN ‘NM’ situation when OCP parameters change within specified limits in the absence of malfunctions in the system (Figure 4).
A latent malfunction should lead to exceeding, by one or several components of the vector of parameters Ξ, the limits acceptable for the normal operation of the OCP. The fact of exceeding by Ξ the boundaries of the parameters will be considered a sign of a latent or developing SN ‘unrecognised’ situation. A change in the steady-state value of one parameter Ξ leads to a change in the steady-state value of the parameters Ξ of all the components of the boundary vector.
In dynamics, some SN, given the random, complex, spontaneous development of damage, or the irregular, unstable behaviour of OCP elements, can replace one another very quickly, according to the GESSN or GESOCP tree SN scenarios. Such situations are ‘difficult’. A more complete definition and separation of the SN ‘violation NM’ is possible based on automatic control of the ASNOM system’s controllability parameters [13]. These parameters are controlled if a disturbance appears. Natural functional disturbances of the OCP are not a sufficiently complete search signal of self-control from the point of view of determining and separating the SN ‘violation NM’. So, for example, in the case of malfunctions of the elements of the formation of the information signal 3uo, the error ε mismatch in the ASNOM system will still remain in the zero zone (Figure 3). Although natural resonance detuning is not a sufficient search signal, its use can increase the frequency of self-checking. For a more complete definition and separation of the SN ‘violation NM’, an artificial search action is introduced into a closed ASNOM system (Figure 4).
It can be proposed to use ‘additional’ information components in the selective search algorithm SP of sufficient information in cases where there are no ‘main’ information components, despite the fact that this proposal tends to solve the problem in the direction of ‘complicating’ the devices. For this, additional rules for the recognition of PDOP and an excess of information and additional recognition time are required. The device solves the following problems within the framework of the automatic stabilisation system: (1) eliminating the ambiguity of determining the essence of transients; (2) control of the amount of information necessary for the operation of relay protection and automation algorithms; (3) monitoring the current possibility of self-destruction of the damage site; (4) monitoring the effectiveness of measures over long time intervals; and (5) implementation of the requirements of self-monitoring and diagnostics when ‘energised’.
All the variety and ‘complexity’ of real-world network signals is controlled by the high-frequency emergency files of RPA device registrars. These registrars supply emergency files for outsourcing analysis. [8, 11, 15]. To solve the control problems and eliminate the instability of the algorithms, we will continue to use the dynamic synthesis method in CAD. A presentable sample of signals from the OCP emergency files is used. In the synthesis and development of real-time algorithms in CAD systems, real circuit diagrams are used. The physical implementation of tasks is monitored in a continuous improvement mode, from ‘simple’ to ‘essential’.
A model is being developed in Matlab to study the properties of a class of dynamic objects for the synthesis of algorithms for managing them over time [11, 12, 13, 14, 15, 16]. Monitoring the operation of the system and algorithms is performed at a given time interval in the form of alarm file signals (Figures 4, 7, 9, 13, and 14). Device models are also represented by GESTS and GESRPA schemes. The more structured and detailed the description of such schemes is obtained, the more qualitatively it is possible to build stable recognition algorithms. Sources of interference signals and damage are used for ‘hacking’, connected to control points of the device. Hacking signals are generated by arcing and interference burning models for various types of development of insulation damage, in emergency operation modes and in normal operation of an object. The training and control samples of signals of real emergency files are generated.
The purpose of the simulation is to develop ways to search for additional information. The modelling problems were solved by dividing the project into hierarchically subordinate computational parts with the result reduced in the generalising part [11, 12, 13]. Each part is calculated separately. Groups of preparatory, main and resulting elements are allocated. Each subsequent group is less active and does not consume computing resources. The more elements in the circuit, the more computing parts it can be divided into. As a result, the time required for a single calculation is reduced while maintaining the stability of the calculation. For example, the group of preparatory elements (MorphA) may include the signal sources, both generating and controlling, of measuring transformers, etc. In the group of basic elements (SyntA) are the inertial circuits of equipment, etc. (Figure 4). The resulting group (SemA) includes elements of the executive bodies, of operational switching, etc. Thus, in addition to modelling, first a certain third-party algorithm for preparing the project for calculation follows. Such an algorithm can be automated. The main general synchronising parameters for the separation of movements are the well-known preliminary settings of the CAD project—the calculation time and control points for displaying information.
The practical significance of the work comes from solving the problems of protection against earth faults in medium-voltage networks of 6–35 kV [7, 8, 9, 16, 17, 18]. The results are used to improve the ASNOM system devices (Figures 1–4), namely, a selective search for the SP of a damaged part of the ‘P-VCR-SP’ network with the functions of a high-frequency recorder VCR, an RPA terminal ‘T-LZSC-ARC’ with the function of auto-compensation of ARC capacitive currents and a widget ‘W-LZSC’ for a window graphically representing of the terminal information on the computer display of the automatic control system.
An analysis of the waveforms of the real high-frequency transient emergency files in the OCP shows that as the transient develops, the ASNOM system will in most cases enter a state of information sufficiency [11, 12, 13]. Therefore, if the ASNOM system is not blocked in the case of insufficient information, as is usually done in known devices, and continues to work according to the appropriate algorithms, then the solution of the problems will be achieved.
Automatic resolution of practical conflicts: The important practical significance of the whole work is automatic conflict resolution in the work of RPA algorithms, the lack of solutions of which has led to a decrease in the reliability of OCP operation, but could not be resolved by other methods. In resolving conflicts previously, there was a reliance on technical and economic optimisation methods, with which it is difficult to practically eliminate doubts about the correctness of the method chosen for dealing with the development of damage in the network. Conflicts were found during practical research in real networks.
Known management conflicts for OCP are: (A) The requirement to quickly disconnect the damaged section of the OCP and realise the network’s ability to isolate itself for self-repair; (B) The possibility of damage to the weakened isolation area of high-voltage equipment caused by a voltage increase in healthy phases in cases of the malfunctioning of protective equipment, and the recorded efficiency of the resonant network’s neutral tuning; (C) Automation of the control algorithms of technological processes and the forced opening (transfer to alarm) of the output of an unstable selective relay protection; (D) The tradition of full control over the operation of the network, but a lack of control over the long-term effectiveness and correct functioning of the protective equipment of the network and of the devices that implement the selected type of neutral grounding in the tasks under consideration. Here are some examples of resolving some conflicts:
Conflict resolution A: ‘temporary compromise’. This is based on the formulation of the general problem of stabilising the normal operating mode of the OCP (Figure 16). It is based on a change in the response time tOFF of the selective search relay SP depending on the value of the semantic signal S(t). Change tOFF is not prohibited for the OCP and may be in the range 0.1 s to 4 h. Figure 17 shows a diagram illustrating the change in the tOFF value depending on the appearance of various (structural) information (TS, NTS) components of the transition process in the OCP. If, during the transition process, counting from the appearance of ‘LFC3uO’, the indicated TS and NTS have appeared, and then the damaged section will be disconnected after the corresponding time interval tOFF. If a longer tOFF time has elapsed from the start of the transient than indicated, and then TS and NTN appear, then disconnection occurs immediately.
Method for automatically resolving a temporary conflict between SP devices and resonant tuning of a network zero sequence loop (LZSC).
Changes in time tOFF in the ASNOM system depending on S(t).
Conflict resolution C: ‘automation of algorithms’. Analysis of the solution of the problem at the modelling stage shows that for correct and effective working of the operational staff in the event of the appearance of SN ‘undetectable’, it is necessary to display the operation of the ASNOM system in the ‘scanner-analyser’ mode (Figures 4 and 16). The screen displays the line of the entire transient process in the network, starting from the background and ending with the current moment. This will help the operating staff in the absence of automatic repair of the damaged network section to eliminate it in manual mode.
Conflict resolution D: ‘on the coincidence of exits’. A method is proposed for the selective search of the required amount of information to detect equipment failures, failures in RPA devices and then through the RPA devices OCP faults (Figures 4 and 15). The algorithm generalises the functions of self-monitoring, monitoring and diagnostics ‘under voltage’. The criteria of active and passive selective SP search are used with the control of natural and artificial transient processes in the OCP [11, 13]. For example, the active methods may include phase-voltage imbalance in a network with a resonantly tuned neutral or phase shunting to ground in a network with an isolated neutral (Figure 3).
An outsourcing method for investigating SN situations using alarm file signals is being implemented. For this, specialised organisations or individual specialists may be involved. Firstly, it is assigned that the output of the TS is formed as efficiently as possible. If the recognition ability is preserved and the amount of information is sufficient, then the second stage of the investigation begins—the establishment and refinement of the parameters of the TS, their weight coefficients of significance and the quality of the TS structural elements. If the problem is not solved, we must investigate further along the information formation chain. The structural tree of the formation of information inside the control object (high-voltage network equipment) should be studied.
The SI method is universal enough for tasks that can be reduced to informational. Information flows can describe the control and protection algorithms of various control objects not only in the energy sector but also in other areas of control. The problems of automatic control in the classical setting are being solved. For example, coordinate control, search, extreme, adaptive, optimal, automatic, automated, expert, dispatch control systems, etc. The problems of pattern recognition in linguistics are solved: decision-making tasks based on morphological features, for example, biological, mechanical, etc., and recognition of information carried by sound vibrations, for example, cochlear and sound pattern recognisers in medicine.
The SI method allows to improve control systems with a lack of initial information in situations that are difficult in meaning when operating the control object. When the input information is changed, impulse rarely appears, consisting of separate diverse components.
Consistent application of SI method templates allows you to not ignore the necessary stages of obtaining results when solving management problems. The statement of management is carried out in the dynamics of the development of processes with the issuance of management commands, for example, up-down, buy-sell, etc. So, first, when solving problems, a workplace is built that allows you to realise the final desired result in CAD, for example, a device issuing commands and receiving input signals. The final result is immediately controlled. In case of its inconsistency, part of the control algorithm changes. Further, as the problem is solved, control algorithms are improved. The development of algorithms proceeds along the path of improvement: ‘from the simple to the necessary’.
A class of dynamic control and protection objects has been allocated for solving problems of improving control algorithms. The development of the SI method for dynamic objects with minimal reference to the specifics of objects is shown. A generalisation of the results is carried out for application to a wider range of tasks in relation to the initial electrical tasks.
Problem-solving is obtained using the instrument of formation and control of a semantic signal. It allows you to operate with a minimum of information but to control the necessary amount of information and solve problems at a more abstract level as well as simulate the operation of specific recognition algorithms, taking into account the specific operation of objects.
A sequence of patterns is presented that allows one to obtain solutions of problems by the SI method. Templates are the reference points for the solution. By templates, you can explore the passage of information components as on navigation charts through interconnected structures. Examples are considered for OCP, individual equipment, transient recognition algorithms and automatic control systems, which can be reduced to dynamic ones.
A method of restructuring the general task of describing the OCP into elementary information components is shown. The principles of the separation of movements by frequencies and meaning for the analysis of the flow of information through the elements of the OCP and recognition algorithms by discrete steps are shown. Operating the structure of information flows will help to improve recognition algorithms and ensure the stability of their work.
Solving the problems of analysing the operation of algorithms and recognising situations is performed at the workplace in CAD in two ways—by functional modelling and by using game theory. The functional modelling takes into account the inertia of movements in the contours of the object as well as the movement of information in the recognition algorithms. Real-time algorithms are presented on a temporary scan of alarm file signals received by device registrars from real objects. Situations make up a library of test signals. An album of the results of modelling emergency files with the results of ‘hacking’ algorithms and countering ‘hacking’ is accumulating. Game theory makes it possible to get a static solution on the points of equilibrium and recognition, which may be the recognition algorithm. This also applies to the object of control and protection. A computing module for use in relay protection and automation tasks is described. The methodology for generating information for the module should prevent misuse of the module and facilitate the interpretation of the results.
According to the SI method, control algorithms are synthesised based on the equality of the GES forming and recognising grammars. The chapter focuses on the formative grammar of the OCP, high-voltage equipment, the structure of the SN semantic situation, the passage of the SN script through the GESOCP and GES equipment circuits as the input of control and monitoring algorithms. Methods for the analysis and synthesis of the recognising grammar are described in detail in the articles from the list of published sources. The recognition algorithms are written off to the finished devices. They are improved for each network, taking into account the reaction of the algorithms to the signals from real emergency files, and the network model in CAD.
The general algorithm for the automatic control of dynamic objects is developed in the form of the selective search for sufficient information for recognition. The SP algorithm makes it possible to synthesise new and analyse well-known algorithms for relay protection and automatic control of ‘complex’ objects with a tunable structure, distributed parameters and the spontaneous development of damage.
It is possible to compensate for the lack of information in difficult semantic situations through new ways of obtaining information, additional information sensors and increasing their intellectual capabilities. Separate sensors are required for all the parameters of the input signals—frequency, phase, transit time and the ratio of special moments in the transient signals in the network.
Several practical examples of the application of the theoretical part of the description are given. This is, first of all, the solution of known conflict situations of automatic control, manifested in the dynamics of the development of semantic situations, namely: (A) The operating time of the automatic system for compensating capacitive currents and the operation of selective relays can and should be variable according to the volume of the semantic signal. (B) Distinguishing between a working and a faulty system in the absence of output commands can be based on analysis of the semantic situations under natural and test influences. (C) Recognition systems need to be built as a dynamic sequence of the opening ‘windows of selectivity’ as one of the moves through the semantic situation tree and the situation scenario tree.
The approach considered is proposed for the joint analysis and synthesis not only of algorithms and software products of semantic processing of information at different levels of the hierarchy of control systems but also for constructive technical solutions. In this analysis, the method is applied in the ‘bottom-up’ direction, that is, starting from the processing of information by a multitude of information sensors; next, the processing of information is concentrated in the ‘branches’ of the processing of the structural-semantic relationships and then in the ‘root’ of automatic decision-making on the outcome. It is clear that, for synthesis problems, this method is best applied ‘bottom-up’.
Supporting women in scientific research and encouraging more women to pursue careers in STEM fields has been an issue on the global agenda for many years. But there is still much to be done. And IntechOpen wants to help.
",metaTitle:"IntechOpen Women in Science Program",metaDescription:"Supporting women in scientific research and encouraging more women to pursue careers in STEM fields has been an issue on the global agenda for many years. But there is still much to be done. And IntechOpen wants to help.",metaKeywords:null,canonicalURL:null,contentRaw:'[{"type":"htmlEditorComponent","content":"At IntechOpen, we’re laying the foundations for the future by publishing the best research by women in STEM – Open Access and available to all. Our Women in Science program already includes six books in progress by award-winning women scientists on topics ranging from physics to robotics, medicine to environmental science. Our editors come from all over the globe and include L’Oreal–UNESCO For Women in Science award-winners and National Science Foundation and European Commission grant recipients.
\\n\\nWe aim to publish 100 books in our Women in Science program over the next three years. We are looking for books written, edited, or co-edited by women. Contributing chapters by men are welcome. As always, the quality of the research we publish is paramount.
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\n\nWe aim to publish 100 books in our Women in Science program over the next three years. We are looking for books written, edited, or co-edited by women. Contributing chapters by men are welcome. As always, the quality of the research we publish is paramount.
\n\nAll project proposals go through a two-stage peer review process and are selected based on the following criteria:
\n\nPlus, we want this project to have an impact beyond scientific circles. We will publicize the research in the Women in Science program for a wider general audience through:
\n\nInterested? If you have an idea for an edited volume or a monograph, we’d love to hear from you! Contact Ana Pantar at book.idea@intechopen.com.
\n\n“My scientific path has given me the opportunity to work with colleagues all over Europe, including Germany, France, and Norway. Editing the book Graph Theory: Advanced Algorithms and Applications with IntechOpen emphasized for me the importance of providing valuable, Open Access literature to our scientific colleagues around the world. So I am highly enthusiastic about the Women in Science book collection, which will highlight the outstanding accomplishments of women scientists and encourage others to walk the challenging path to becoming a recognized scientist." Beril Sirmacek, TU Delft, The Netherlands
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