Cohen’s kappa for categories of aspect and polarity.
\r\n\tThe development of the interpersonal model and the Kleinian school in the second half of the last century allowed the emergence of an original understanding of the unconscious mind. Within the intersubjective paradigm, the psychoanalytic situation is conceptualized as an interpersonal field to which both the analyst and the patient contribute substantially. We have shown elsewhere how the failure to give a full account of such an intersubjective dimension in both psychoanalytic theory and practice amounts to a core liability in contemporary psychoanalytic discourse.
\r\n\r\n\tThe present book will focus on a few areas where the insufficient development of our discipline is currently apparent: five wounds that mark the body of the psychoanalytic enterprise.
\r\n\r\n\tNew contributions are particularly needed in the following areas: Current conceptualization of the unconscious mind is mechanistic and not suited to incorporate the full network of interpersonal exchanges which unfolds in the analytic room; Furthermore, the development of interpersonal psychoanalysis and the theory of the object relations warrants a greater appreciation of the impact of extratranference relations (e.g., couple, family, peers) on the patient's inner life both within and without the psychoanalytic situation.
\r\n\r\n\tAn integration of theories and models from other psychological paradigms is clearly in order here; the book will also focus on Barangers’ theory of the bi-personal field that makes traditional unipersonal models of the psychoanalytic process untenable. Also, it will help in the understanding of the reciprocal interactions of the two partners in the psychoanalytic dyad in most psychoanalytic institutes the training format relies naively on models from the academic or the professional domains. This fosters rigidity, conformism, and a hierarchical organizational style in the institutional life; e) all over the long span of his creative life Freud showed consistent interest in the application of psychoanalysis to literature, the arts, religion, and politics. Contemporary psychoanalysis is getting more and shyer and is pressed at the margins of social and political debate. The psychoanalytic theory includes unique lore of knowledge about the conscious and unconscious mind. Without it, a comprehensive understanding of human reality will stay out of the reach of contemporary culture.
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Gaining insights into these fields can facilitate the development of the robust strategy that can enhance tourist experience and further boost tourist loyalty and recommendations. Traditionally, business rely on the structured quantitative approach, for example, rating tourist satisfaction level based on the Likert Scale. Although this approach is effective to prove or disprove existing hypothesis, the closed ended questions cannot reveal exact tourist experience and feelings of the products or services, which hampers obtaining insights from tourists. Actually, business have already applied sophisticated and advanced approaches, such as text mining and sentiment analysis, to disclose the patterns hidden behind the data and the main themes.
Sentiment analysis (SA) has been used to deal with the unstructured data in the domain of tourism, such as texts, images, and video to investigate decision-making process [1], service quality [2], destination image and reputation [3]. As for the level of sentiment analysis, it has been found that most extant sentiment analysis in the domain of tourism is conducted at document level [4, 5, 6, 7]. Document-based sentiment analysis (DBSA) regards the individual whole review or each sentence as an independent unit and assume there is only one topic in the review or in the sentence. However, this assumption is invalid as people normally express their semantic orientation on different aspects in a review or a sentence [8]. For example, in the sentence “we had impressive breakfast, comfortable bed and friendly and professional staff serving us”, the aspects discussed here are “breakfast”, “bed” and “staff” and the users give positive comments on these aspects (“impressive”, “comfortable” and “friendly and professional”). Since the sentiment obtained through DBSA is at coarse level, aspect-based sentiment analysis (ABSA) has been suggested to capture sentiment tendency of finer granularity.
To obtain the sentiment at the finer level, ABSA has been proposed and developed over the years. ABSA normally involves three tasks, the extraction of opinion target (also known as the “aspect term”), the detection of aspect category and the classification of sentiment polarity. Traditional methods to extract aspects rely on the word frequency or the linguistic patterns. Nevertheless, it cannot identify infrequent aspects and heavily depends on the grammatical accuracy to manipulate the rules [9]. As for the detection of sentiment polarity, supervised machine learning approaches, like Maximum Entropy (ME), Conditional Random Field (CRF) and Support Vector Machine (SVM). Although machine learning-based approaches have achieved desirable accuracy and precision, they require huge dataset and manual training data. In addition, the results cannot be duplicated in other fields [10]. To overcome these shortcomings, ABSA of deep learning (DL) approaches has the advantage of automatically extracting features from data [9]. Extant studies based on DL methods in tourism have investigated and explored tourist experiences in economy hotel [11], the identification of destination image [12], review classification [13]. Although DL methods have been applied in tourism, ABSA in tourism is scant. Therefore, this study reviewed sentiment analysis at aspect level conducted by DL approaches, compared the performance of DL models, and explored the model training process.
With the references of surveys about DL methods [9, 14], this study followed the framework of ABSA proposed by Liu (2011) [8] to achieve the following aims: (1) provide an overview of the studies using DL-based ABSA in tourism for researchers and practitioners; (2) provide practical guidelines including data annotation, pre-processing, as well as model training for potential application of ABSA in similar areas; (3) train the model to classify sentiments with the state-of-art DL methods and optimizers using datasets collected from TripAdvisor. This paper is organized as follows: Section 2 reviews the cutting-edge techniques for ABSA, studies using DL for NLP tasks in tourism, and research gap; Section 3 presents the annotation schema of the given corpus and DL methods used in this study; Section 4 describes the details of annotation results, model training, and the experiment results. Section 5 provides the conclusions and future extensions.
An extensive literature review of the state-of-art techniques for ABSA and the studies using DL in tourism is provided in this section.
To convert the NLP problems into the form that computers can deal with, the texts are required to be transformed into a numerical value. In ML-based approaches, One-hot and Counter Vectorizer are commonly used. One-hot encoding can realize a token-level representation of a sentence. However, the use of One-hot encoding usually results in high dimension issues, which is not computationally efficient [15]. Another issue is the difficulty of extracting meanings as this approach assumes that words in the sentence are independent, and the similarities cannot be measured by distance nor cosine-similarity. As for Counter Vectorizer, although it can convert the whole sentence into one vector, it cannot consider the sequence of the words and the context.
Nevertheless, in DL based approaches, pre-trained word embeddings have been proposed in [16, 17]. Word embedding, or word representation, refers to the learned representation of texts in which the words with identical meanings would have similar representation. It has been proved that the use of word embeddings as the input vectors can make a 6–9% increase in aspect extraction [18] and 2% in the identification of sentiment polarity [19]. Pre-trained word embeddings are favored as random initialization could result in stochastic gradient descent (SGD) in local minima [20]. Based on the network language model, a feedforward architecture, which combined a linear projection layer and a non-linear hidden layer, could learn the word vector representation and a statistical language model [21].
Word2Vec [16] proposed the skip-gram and continuous bag-of-words (CBOW) models. By setting the window size, skip-gram can predict the context based on the given words, while the CBOW can predict the word based on the context. Frequent words also are assigned binary codes in Huffman trees because Also, due to the fact that the word frequency is appropriate to acquire classes in neural net language models, frequent words are assigned binary codes in Huffman trees. This practice in Word2Vec helps reduce the number of output units that are required to be assessed. However, the window-based approaches of Word2Vec do not work on the co-occurrence of the text and do not harness the huge amount of repetition in the texts. Therefore, to capture the global representation of the words in all sentences, GloVe can take advantage of the nonzero elements in a word-word cooccurrence matrix [17]. Although the models discussed above performed well in similarity tasks and named entity recognition, they cannot cope with the polysemous words. In a more recent development, Embeddings from language model (ELMo) [22], Bi-directional Encoder Representations from Transformers (BERT) [23] can identify the context-sensitive features in the corpus. The main difference between these two architectures is that ELMo is feature-based, while BERT is deeply bidirectional. To be specific, the contextual representation of each token is obtained through the concatenation of the left-to-right and right-to-left representations. In contrast, BERT applies masked language models (MLM) to acquire the pre-trained deep bidirectional representations. MLM can randomly mask certain tokens from the input and predict the ID of the input depending only on the context. Additionally, BERT is capable of addressing the issues of long text dependence.
Nonetheless, researchers have combined certain features with word embedding to produce more pertinent results. These features include Part-Of-Speech (POS) and chunk tags, and commonsense knowledge. It has been observed that aspect terms are usually nouns or noun phrases [8]. The original word embeddings of the texts are concatenated with as k-dimensional binary vectors that represent the k POS, or k tags. The concatenated word embeddings are fed into the models (Do et al.,, Prasad, Maag, and Alsadoon, 2019 [9]). It has been proved that the use of POS tagging as input can improve the performance of aspect extraction, with gains from 1% [18, 20] to 4% [24]. Apart from the POS, concepts that are closely related to the affections are suggested to be added as word embeddings [25, 26]. POS focused on the grammatical tagging of the words in a corpus, while concepts that are extracted from SenticNet emphasize the multi-word expressions and the dependency relation between clauses. For example, the multi-word expression “win lottery” could be related to the emotions “Arise-joy” and the single-word expression “dog” is associated with the property “Isa-pet” and the emotions “Arise-joy” [26]. After being parsed by SenticNet, the obtained concept-level information (property and the emotions) is embedded into the deep neural sequential models. The performance of the Long Short-Term Memory (LSTM) [27] combined with SenticNet exceeded the baseline LSTM [26].
This section reviews the DL methods used for ABSA, including Convolutional Neural Network (CNN), Recurrent Neural Network (RNN), Attention-based RNN, and Memory Network.
CNN can learn to capture the fixed-length expressions based on the assumption that keywords usually include the aspect terms with few connections of the positions [28]. Besides, as CNN is a non-linear model, it usually outperforms the linear-model and rarely relies on language rules [29]. A local feature window of 5 words was firstly created for each word in the sentence to extract the aspects. Then, a seven-layer of CNN was tested and generated better results [29]. To capture the multi-word expressions, the model proposed [30] contained two separate convolutional layers with non-linear gates. N-gram features can be obtained by the convolutional layers with multiple filters. Li et al. [13] put position information between the aspect words and the context words into the input layer in CNN and introduced the aspect-aware transformation parts. Fan et al. [31] integrated the attention mechanism with a convolutional memory network. This proposed model can learn multi-word expressions in the sentence and identify long-distance dependency.
Apart from simply extracting the aspects alone, CNN can identify the sentiment polarity at the same time, which can be regarded as multi-label tasking classification or multitasking issues. As for researchers who considered ABSA multi-label tasking classification, a probability distribution threshold was applied to select the aspect category and the aspect vector was concatenated with the word embedding, which was then further performed using CNN. Xu et al. [32] combined the CNN with the non-linear CRF to extract the aspect, which was then concatenated with the word embeddings and fed into another CNN to identify the sentiment polarity. Gu et al. [33] proposed a CNN with two levels that integrated the aspect mapping and sentiment classification. Compared with conventional ML approaches, this approach can lessen the feature engineering work and elapsed time [9]. It should be noticed that the performance of multitasking CNN does not necessarily outperform multitasking methods [19].
RNN has been applied for the ABSA and SBSA in the UGC. RNN models use a fixed-size vector to represent one sequence, which could be a sentence or a document, to feed each token into a recurrent unit. The main differences between CNN and RNN are: (1) the parameters of different layers in RNN are the same, making a fewer number of parameters required to be learned; (2) since the outputs from RNN relies on the prior steps, RNN can identify the context dependency and suitable for texts of different lengths [34, 35, 36].
However, the standard RNN has prominent shortcomings of gradient explosion and vanishing, causing difficulties to train and fine-tune the parameter during the process of prorogation [34]. LSTM and Gated Recurrent Unit (GRU) [37] have been proposed to tackle such issues. Also, Bi-directional RNN (Bi-RNN) models have been proposed in many studies [38, 39]. The principle behind Bi-RNN is the context-aware representation can be acquired by concatenating the backward and the forward vectors. Instead of the forward layer alone, a backward layer was combined to learn from both prior and future, enabling Bi-RNN to predict by using the following words. It has been proved that the Bi-RNN model achieved better results than LSTM in the highly skewed data in the task of aspect category detection [40]. Especially, Bi-directional GRU is capable of extracting aspects and identifying the sentiment in the meanwhile [23, 41] by using Bi-LSTM-CRF and CNN to extract the aspects in the sentence that has more than one sentiment targets.
Another drawback of RNN is that RNN encodes peripheral information, especially when it is fed with information-rich texts, which would further result in semantic mismatching problems. To tackle the issue, the attention mechanism is proposed to capture the weights from each lower level, which are further aggregated as the weighted vector for high-level representation [42]. In doing so, the attention mechanism can emphasize aspects and the sentiment in the sentence. Single attention-based LSTM with aspect embeddings [43], and position attention-based LSTM [44], syntactic-aware vectors [45] were used to capture the important aspects and the context words. The aspect and opinion terms can be extracted in the Coupled Multi-Layer Attention Model based on GRU [46] and the Bi-CNN with attention [47]. These frameworks require fewer engineering features compared with the use of CRF.
The development of the deep memory network in ABSA was originated from the multi-hop attention mechanism that applies the exterior memory to compute the influence of context words on the given aspects [36]. A multi-hop attention mechanism was set over an external memory that can recognize the importance level of the context words and can infer the sentiment polarity based on the contexts. The tasks of aspect extraction and sentiment identification can be achieved simultaneously in the memory network in the model proposed by [13]. Li et al. [13] used the signals obtained in aspect extraction as the basis to predict the sentiment polarity, which would further be computed to identify the aspects.
Memory networks can tackle the problems that cannot be addressed by attention mechanism. To be specific, in certain sentences, the sentiment polarity is dependent on the aspects and cannot be inferred from the context alone. For example, “the price is high” and “the screen resolution is high”. Both sentences contain the word “high”. When “high” is related to “price”, it refers to negative sentiment, while it represents positive sentiment when “high” is related to “screen resolution”. Wang et al. [48] proposed a target-sensitive memory network proposed six techniques to design target-sensitive memory networks that can deal with the issues effectively.
To obtain finer-grained sentiment of tourists’ experiences in economy hotels in China, [11] used Word2Vec to obtain the word embeddings as the model input, and bidirectional LSTM with CRF model was used to train and predict the data. The whole model includes the text layer, POS layer, connection layer, and output layer, in which CRF was used for data output, reaching an accuracy of 84%. Chang et al. [49] applied GloVe to pre-train the word embedding. To improve the performance, feature vectors, like sentiment scores, temporal intervals, reviewer profiles, were added into CNN models. Their results proved that temporal intervals made a greater contribution than the sentiment score and review profile for the managers to respond to the reviews. Gao et al. [50] explored the model that built CNN on LSTM and proved that the combined model outperformed the single CNN or LSTM model, with an improvement of 3.13% and 1.71% respectively.
To summarize, DL methods have been extensively used to perform ABSA. However, ABSA in the domain of tourism is little in the literature. Therefore, this study aimed at conducting ABSA using a dataset collected from TripAdvisor for predicting sentiments. Based on the literature review, it can be observed that RNN models especially attention-based RNN models achieved better performance than CNN models in terms of accuracy. Therefore, attention-based gated RNN models including LSTM and GRU were used in this study, which is summarized in the following section. Zhou et al. [14] conducted a series of ABSA on Semeval datasets [51, 52] using various DL methods. The experimental results confirmed that RNN with an attention-based mechanism obtained higher accuracies but relatively low precisions and recalls. This is because the Semeval datasets are naturally unbalanced datasets in which the fraction of positive sentiment samples is significantly higher than the fractions of neutral and negative sentiment samples, which indicates the importance of fractions of sentiment samples in the datasets. Inspired by ABSA on Semeval datasets, four datasets with different fractions of sentiment samples were resampled from the dataset of TripAdvisor hotel reviews to investigate the effect of sample imbalance on the model performance. Also, optimizers to minimize loss play a key role in model training. Therefore, three optimizers including the state-of-art optimizer were used in this study to compare their performance.
Based on the consideration and the purpose of the study, the corpora in this study will be completely in English and will include reviews collected from casino resorts in Macao. A self-designed tool programmed in Python was implemented to acquire all the URLs, which were first stored and further used as the initial page to crawl all the UGC that belongs to the hotel. The corpus includes 61544 reviews of 66 hotels. The length of the reviews varied greatly, with a maximum of 15 sentences, compared to the minimum of one sentence.
In terms of the size of the corpora that requires annotation, as there is no clear instruction regarding the size of the corpora, this study referred to Liu’s work and SemEval’s task. In machine learning based studies, it is reasonable to consider that the corpus that has 800–1000 aspects would be sufficient, while for deep-learning based approach, we think at least 5000 aspects in total would be acceptable. As the original data was annotated first to be further analyzed, 1% of the reviews were randomly sampled from the corpus. Therefore, 600 reviews that contain 5506 sentences were selected for ABSA in this study.
Although previous works annotated the corpora and performed sentiment analysis, they did not reveal the annotation principles [51, 53] and the categories are rather coarse. For example, [53] used pre-defined categories to annotate the aspects of the restaurant. The categories involved “Food, Service, Price, Ambience, Anecdotes, and Miscellaneous”, which did not annotate the aspects of finer levels. In addition, the reliability and validity of the annotation scheme have not been proved.
As the training of the models discussed above requires the annotation of domain-specific corpora, this study referred to [54]. The design of the annotation schema calls for the identification of aspect-sentiment pairs. Specifically,
To ensure the reliability and validity, Cohen’s
The LSTM unit proposed by [25] overcomes the gradient vanishing or exploding issues in the standard RNN. The LSTM unit is consisted of forget, input, and output gates, as well as a cell memory state. The LSTM unit maintained a memory cell
where
The forget gate decides the extent to which the existing memory is kept (Eq. (2)), while the extent to which the new memory is added to the memory cell is controlled by the input gate (Eq. (3)). The memory cell is updated by partially forgetting the existing memory and adding a new memory content (Eq. (5)). The output gate summarizes the memory content exposure in the unit (Eq. (4)). LSTM unit can decide whether to keep the existing memory with three gates. Intuitively, if the LSTM unit detects an important feature from an input sequence at an early stage, it easily carries this information (the existence of the feature) over a long distance, hence, capturing potential long-distance dependencies.
A Gated Recurrent Unit (GRU) that adaptively remembers and forgets was proposed by [37]. GRU has reset and update gates that modulate the flow of information inside the unit without having a memory cell compared with the LSTM unit. Each GRU can be computed as follows:
The reset gate filters the information from the previous hidden layer as a forget gate does in the LSTM unit (Eq. (8)), which effectively allows the irrelevant information to be dropped, thus, allowing a more compact representation. On the other hand, the update gate decides how much the GRU updates its information (Eq. (9)). This is similar to LSTM. However, the GRU does not have the mechanism to control the degree to which its state is exposed instead of fully exposing the state each time.
The standard LSTM and GRU cannot detect the important part for aspect-level sentiment classification. To address this issue, [43] proposed an attention mechanism that allows the model to capture the key part of a sentence when different aspects are concerned. The architecture of a gated RNN model considering the attention mechanism which can produce an attention weight vector
where
The feature representation of a sentence with an aspect
where
To better take advantage of aspect information, aspect embedding is appended into each word embedding to allow its contribution to the attention weight. Therefore, the hidden layer can gather information from the aspect and the interdependence of words and aspects can be modeled when computing the attention weights.
In the first trial, Cohen’s
Attribute | Polarity | |
---|---|---|
First trial | 0.86 | 0.88 |
Second trial | 0.89 | 0.91 |
Cohen’s kappa for categories of aspect and polarity.
Based on the revisions of the annotation schema, the coders conducted the second trial. With the revised annotation schema, the Cohen’s
The experiment was conducted on the dataset of TripAdvisor hotel reviews which contains 5506 sentences, where the numbers of positive, neutral, and negative sentiment samples are 3032, 2986, and 2725, respectively. Given a dataset, maximizing the predictive performance and training efficiency of a model requires finding the optimal network architecture and tuning hyper-parameters. In addition, the samples can significantly affect the performance of the model. To investigate the effect of sentiment sample fractions on the model performance, four sub-datasets with 4000 sentiment samples subjected to different sentiment fractions were resampled from the TripAdvisor hotel dataset as the train sets, one is a balanced dataset and three are unbalanced datasets that the sample fraction of sentiment positive, neutral, and negative dominated, respectively. In addition, it is observed that the average number of the aspects in a sentence is about 1.4, and the average length of the aspects in a sentence is about 8.0, which indicates that one sentence normally contains more than one aspect and the aspect averagely contains eight characters. The number of aspects in train and test sets is more than 850 and 320, respectively, which confirms the diversity of aspects in the dataset of TripAdvisor hotel reviews. For each train set, 20% of reviews were selected as the validation set.
Attention-based gated RNN models including LSTM and GRU were used for ABSA. Attention-based GRU/LSTM without and with aspect embedding were referred to as AT-GRU/AT-LSTM and ATAE-GRU/ATAE-LSTM, respectively. The details of the configurations and used hyper-parameters are summarized in Table 2. In the experiments, all word embeddings with the dimension of 300 were initialized by GloVe [17]. The word embeddings were pre-trained on an unlabeled corpus of which size is about 840 billion. The dimension of hidden layer vectors and aspect embedding are 300 and 100 respectively. The weight matrices are initialized with the uniform distribution U (−0.1, 0.1), and the bias vectors are initialized to zero. The learning rate and mini-batch size are 0.001 and 16 respectively. The best optimizer and number of epochs were obtained from {SGD, Adam, AdaBelief} and {100, 300, 500} respectively via grid search. The optimal parameters based on the best performance on the validation set were kept and the optimal model is used for evaluation in the test set.
Configuration | Hyper-parameter |
---|---|
Word embedding | GloVe |
Dimension of word embedding | 300 |
Dimension of hidden layer | 30 |
Dimension of aspect embedding | 100 |
Initializer of weight matrices | Uniform distribution U(−0.1, 0.1) |
Initializer of bias vectors | Zero |
Optimizer | Search from {SGD, Adam, AdaBelief} |
Number of epochs | Search from {100, 300, 500} |
Dropout | 0.5 |
Learning rate | 0.001 |
Multi-batch size | 16 |
Details of configurations and used hyper-parameters.
The aim of the training is to minimize the cross-entropy error between the target sentiment distribution
where
On the other hand, early stopping is a commonly used and effective way to avoid over-fitting. It reliably occurs that the training error decreases steadily over time, but validation set error begins to rise again. Therefore, early stopping terminates when no parameters have improved over the best-recorded validation error for a pre-specified number of iterations. Additionally, dropout is a simple way to prevent the neural network from overfitting, which refers to temporarily removing cells and their connections from a neural network [55]. In an RNN model, dropout can be implemented on input, output, and hidden layers. In this study, only the output layer with a dropout ratio of 0.5 was followed by a linear layer to transform the feature representation to the conditional probability distribution.
Optimizers are algorithms used to update the attributes of the neural network such as parameter set and learning rate to reduce the losses to provide the most accurate results possible. Three optimizers namely SGD [56], Adam [57], and AdaBelief [58] were used in the experiment to search for the best performance. The standard SGD uses a randomly selected batch of samples from the train set to compute derivate of loss, on which the update of the parameter set is dependent. The updates in the case of the standard SGD are much noisy because the derivative is not always toward minima. As result, the standard SGD may have a more time complexity to converge and get stuck at local minima. In order to overcome this issue, SGD with momentum is proposed by Polyak [56] (1964) to denoise derivative using the previous gradient information to the current update of the parameter set. Given a loss function
where
Both Adam and AdaBelief are adaptive learning rates optimizer. Adam records the first moment of gradient
where
The second moment of gradient
The update rules for parameter set using Adam and AdaBelief are given by Eqs. (23) and (24), respectively:
where
Specifically, the update direction in Adam is
It is noted that the best models in the validation set were obtained by returning to the parameter set at the point in time with the lowest validation set error.
As for the confusion matrix for a multi-class classification task, accuracy is the most basic evaluation measure of classification. The evaluation measure accuracy represents the proportion of the correct predictions of the trained model, and it can be calculated as:
where
Summary of model performance.
where
This study computed accuracy (A), macro precision (P), macro recall (R), and macro F1-score (F) of AT-GRU, ATAE-GRU, AT-LSTM, and ATAE-LSTM trained with various optimizers and epochs. The results show: (1) Attention-based models (AT-GRU and AT-LSTM) performed better than attention-based models with aspect embedding (ATAE-GRU and ATAE-LSTM). Taken Dataset 1 for example, the best accuracy in the test set using AT-GRU was 80.7%, while the best accuracy using ATAE-GRU was 75.3%; (2) Attention-based GRU performed better than attention-based LSTM. Taken AT-GRU and AT-LSTM for example, the accuracy and macro F1-score of AT-GRU for all datasets were higher than those of AT-LSTM; (3) The balanced dataset (Dataset 1) achieved the best predictive performance for all models. For the unbalanced datasets, the accuracy was exactly close to that of the balanced dataset. However, the macro precision, recall, and F1-score were significantly lower than those of the balanced dataset, which confirmed that the balanced dataset had the best generalization and stability in this study; (4) For Dataset 3 in which the neutral sentiment samples dominated, all of the models exhibited the worst predictive performance compared with other datasets. The candidate model for each dataset is illustrated in Figure 1. It is noted that the candidate model was selected according to accuracy. However, the model with a higher macro F1-score was selected as the candidate model instead when the accuracies of models were similar. Among 16 models, AT-GRU trained with the optimizer of AdaBelief and epoch of 300 in Dataset 1 achieved the highest accuracy of 80.7% and macro F1-score of 75.0% in the meanwhile. Figure 2 illustrates the normalized confusion matrix of the best predictive model of which diagonal represented for the precisions. The precisions of positive and negative sentiment classification were about 20% higher than that of neutral sentiment classification, which confirmed that the need to boost the precision of neutral sentiment classification in order to globally improve the accuracy of the model in future work.
Normalized confusion matrix of model with best predictive performance.
Early stopping was used in this research to avoid overfitting and save training time. Figure 3 illustrates the learning history of AT-GRU using early stopping in four datasets, where the training stopped when the validation loss kept increasing for 5 epochs (i.e., “patience” equals to 5 in this study). For all datasets, the validation accuracy was exactly close to the training validation during the training procedure, which confirmed that early stopping was able to effectively avoid overfitting. Experimental results of A/P/R/F obtained based on training AT-GRU and AT-LSTM using early stopping. The accuracies obtained by AT-GRU and AT-LSTM were similar. For the balanced dataset, the accuracy and macro F1-score obtained by early stopping were significantly lower than that obtained by the corresponding model without early stopping. This is because the loss function probably found the local minima if the training stopped when the loss started to rise for 5 epochs. All of the optimizers used in this study were aimed at avoiding the loss function sticking at the local minima to find the global loss minima, therefore, using more epochs in the training was effective to obtain the best predictive performance model. On the other hand, for the unbalanced datasets, the accuracy and macro F1-score obtained by early stopping were similar to that obtained by the corresponding model without early stopping, which indicated that early stopping was effective to avoid overfitting as the loss converged fast in the unbalanced dataset. Although early stopping is a straightforward way of avoiding overfitting and improving training efficiency, the trade-off is that the model for test set possibly returns at the time point when reaching the local minima of loss function especially for the balanced dataset, and a new hyper-parameter of “patience” which is sensitive to the results is introduced.
Learning history of AT-GRU using early stopping.
Three optimizers were used in this study to find the best model. Figure 4 illustrates the learning history of AT-GRU in four datasets. The gap between training and validation accuracy was the largest, which indicated that the worst generalization of Adam among three optimizers in this study although it converged quickly at the very beginning except for Dataset 3. Both SGD and AdaBelief can achieve good predictive performance with good generalization, however, AdaBelief converged faster than SGD, and the best results were achieved by AdaBelief.
Learning history of AT-GRU.
In this study, the hotel review dataset collected from TripAdvisor for aspect-level sentiment classification was first established. The dataset contains 5506 sentences in which the numbers of positive, neutral, and negative sentiment samples are 3032, 2986, and 2725, respectively. In order to study the effect of the fraction of sentiment samples on the model performance, four sub-datasets with a various fraction of sentiment samples were resampled from the TripAdvisor hotel review dataset as the train sets. The task in this study is to determine the aspect polarity of a given review with the corresponding aspects. To achieve a good predictive performance toward a multi-class classification task, attention-based GRU and LSTM (AT-GRU and AT-LSTM), as well as attention-based GRU and LSTM with aspect embedding (ATAE-GRU and ATAE-LSTM), were optimized with SGD, Adam, and AdaBelief and trained with epochs of 100, 300, and 500, respectively. Conclusions from these experiments are as follows:
AT-GRU and AT-LSTM performed better than ATAE-GRU and ATAE-LSTM. Taken the balanced dataset as an example, the best accuracy in the test set using AT-GRU was 80.7%, while the best accuracy using ATAE-GRU was 75.3%.
Attention-based GRU performed better than attention-based LSTM. Taken AT-GRU and AT-LSTM for example, the accuracy and macro F1-score of AT-GRU for all datasets were higher than those of AT-LSTM.
The balanced dataset achieved the best predictive performance. For the unbalanced datasets, the accuracy was exactly close to that of the balanced dataset, however, the macro precision, recall, and F1-score were significantly lower than those of the balanced dataset, which confirmed that the balanced dataset had the best generalization and stability in this study. For the dataset in which the neutral sentiment samples dominated, all of the models exhibited the worst predictive performance.
For the balanced dataset, the accuracy and macro F1-score obtained by early stopping was significantly lower than that obtained by the corresponding model without early stopping. However, for the unbalanced datasets, the accuracy and macro F1-score obtained by early stopping were similar to that obtained by the corresponding model without early stopping, which indicated that early stopping was effective to avoid overfitting as the loss converged fast in the unbalanced datasets.
For optimizers, both SGD and AdaBelief can achieve good predictive performance with good generalization, however, AdaBelief converged faster than SGD, and the best results were achieved by AdaBelief.
This work includes the application of natural language processing technologies on the aspect-level sentiment analysis of the TripAdvisor hotel dataset, and there are still several extensions to be explored as follows:
Enlargement of the dataset. This study focused on the hotel in Macau, collecting 5506 reviews from TripAdvisor. To improve the model performance, hotels from other countries and regions can be collected into the dataset.
Improvement of model performance, especially for the predictive capacity of the neutral sentiment samples. The sentence and aspect embeddings were initialized with GloVe, and BERT which is popular in recent research can be used. In addition, although the attention mechanism was used in this study to improve model performance, the state-of-art self-attention mechanism such as multi-head attention can be used in the future to further refine the model.
Development of a mobile application. Once the model with stable performance is achieved, RNN algorithms can be integrated into a portable device such as a smartphone to help with real-time aspect-level sentiment analysis in tourism.
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These include smaller particle used to fill the column, more homogeneous spherical particles, core-shell particles, monolithic columns, more pure silica as a stationary phase support, use of ethylene bridge silica, a wider variety of active phases, use of mixed mode stationary phases, use of polymers as stationary phase, use of various endcapping techniques, etc. Miniaturization and progress in the instrumentation played an important role for the chromatographic column development. All these aspects are summarized in the present chapter.",book:{id:"11204",title:"Analytical Liquid Chromatography - New Perspectives",coverURL:"https://cdn.intechopen.com/books/images_new/11204.jpg"},signatures:"Serban C. 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That is exactly what he does, diving into Machine Learning algorithms and technologies to help TECNALIA to decide whether something is great in theory or will actually impact on the product or processes of its projects. So, he is expert at framing experiments, developing hypotheses, and proving whether they’re true or not, in order to investigate fundamental problems with a longer time horizon. He is also able to design and develop PoCs and system prototypes in simulation. He has participated in several national and internacional R&D projects.\n\nAs another relevant part of his everyday research work, he usually publishes his findings in reputed scientific refereed journals and international conferences, occasionally acting as reviewer and Programme Commitee member. Concretely, since 2018 he has published 9 JCR (8 Q1) journal papers, 9 conference papers (e.g. ECML PKDD 2021), and he has co-edited a book. He is also active in popular science writing data science stories for reputed blogs (KDNuggets, TowardsDataScience, Naukas). Besides, he has recently embarked on mentoring programmes as mentor, and has also worked as data science trainer.",institutionString:"TECNALIA Research & Innovation",institution:{name:"Tecnalia",country:{name:"Spain"}}},{id:"103779",title:"Prof.",name:"Yalcin",middleName:null,surname:"Isler",slug:"yalcin-isler",fullName:"Yalcin Isler",position:null,profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bRyQ8QAK/Profile_Picture_1628834958734",biography:"Yalcin Isler (1971 - Burdur / Turkey) received the B.Sc. degree in the Department of Electrical and Electronics Engineering from Anadolu University, Eskisehir, Turkey, in 1993, the M.Sc. degree from the Department of Electronics and Communication Engineering, Suleyman Demirel University, Isparta, Turkey, in 1996, the Ph.D. degree from the Department of Electrical and Electronics Engineering, Dokuz Eylul University, Izmir, Turkey, in 2009, and the Competence of Associate Professorship from the Turkish Interuniversity Council in 2019.\n\nHe was Lecturer at Burdur Vocational School in Suleyman Demirel University (1993-2000, Burdur / Turkey), Software Engineer (2000-2002, Izmir / Turkey), Research Assistant in Bulent Ecevit University (2002-2003, Zonguldak / Turkey), Research Assistant in Dokuz Eylul University (2003-2010, Izmir / Turkey), Assistant Professor at the Department of Electrical and Electronics Engineering in Bulent Ecevit University (2010-2012, Zonguldak / Turkey), Assistant Professor at the Department of Biomedical Engineering in Izmir Katip Celebi University (2012-2019, Izmir / Turkey). He is an Associate Professor at the Department of Biomedical Engineering at Izmir Katip Celebi University, Izmir / Turkey, since 2019. In addition to academics, he has also founded Islerya Medical and Information Technologies Company, Izmir / Turkey, since 2017.\n\nHis main research interests cover biomedical signal processing, pattern recognition, medical device design, programming, and embedded systems. He has many scientific papers and participated in several projects in these study fields. He was an IEEE Student Member (2009-2011) and IEEE Member (2011-2014) and has been IEEE Senior Member since 2014.",institutionString:null,institution:{name:"Izmir Kâtip Çelebi University",country:{name:"Turkey"}}},{id:"339677",title:"Dr.",name:"Mrinmoy",middleName:null,surname:"Roy",slug:"mrinmoy-roy",fullName:"Mrinmoy Roy",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/339677/images/16768_n.jpg",biography:"An accomplished Sales & Marketing professional with 12 years of cross-functional experience in well-known organisations such as CIPLA, LUPIN, GLENMARK, ASTRAZENECA across different segment of Sales & Marketing, International Business, Institutional Business, Product Management, Strategic Marketing of HIV, Oncology, Derma, Respiratory, Anti-Diabetic, Nutraceutical & Stomatological Product Portfolio and Generic as well as Chronic Critical Care Portfolio. A First Class MBA in International Business & Strategic Marketing, B.Pharm, D.Pharm, Google Certified Digital Marketing Professional. Qualified PhD Candidate in Operations and Management with special focus on Artificial Intelligence and Machine Learning adoption, analysis and use in Healthcare, Hospital & Pharma Domain. Seasoned with diverse therapy area of Pharmaceutical Sales & Marketing ranging from generating revenue through generating prescriptions, launching new products, and making them big brands with continuous strategy execution at the Physician and Patients level. Moved from Sales to Marketing and Business Development for 3.5 years in South East Asian Market operating from Manila, Philippines. Came back to India and handled and developed Brands such as Gluconorm, Lupisulin, Supracal, Absolut Woman, Hemozink, Fabiflu (For COVID 19), and many more. In my previous assignment I used to develop and execute strategies on Sales & Marketing, Commercialization & Business Development for Institution and Corporate Hospital Business portfolio of Oncology Therapy Area for AstraZeneca Pharma India Ltd. Being a Research Scholar and Student of ‘Operations Research & Management: Artificial Intelligence’ I published several pioneer research papers and book chapters on the same in Internationally reputed journals and Books indexed in Scopus, Springer and Ei Compendex, Google Scholar etc. Currently, I am launching PGDM Pharmaceutical Management Program in IIHMR Bangalore and spearheading the course curriculum and structure of the same. I am interested in Collaboration for Healthcare Innovation, Pharma AI Innovation, Future trend in Marketing and Management with incubation on Healthcare, Healthcare IT startups, AI-ML Modelling and Healthcare Algorithm based training module development. I am also an affiliated member of the Institute of Management Consultant of India, looking forward to Healthcare, Healthcare IT and Innovation, Pharma and Hospital Management Consulting works.",institutionString:null,institution:{name:"Lovely Professional University",country:{name:"India"}}},{id:"310576",title:"Prof.",name:"Erick Giovani",middleName:null,surname:"Sperandio Nascimento",slug:"erick-giovani-sperandio-nascimento",fullName:"Erick Giovani Sperandio Nascimento",position:null,profilePictureURL:"https://intech-files.s3.amazonaws.com/0033Y00002pDKxDQAW/ProfilePicture%202022-06-20%2019%3A57%3A24.788",biography:"Prof. Erick Sperandio is the Lead Researcher and professor of Artificial Intelligence (AI) at SENAI CIMATEC, Bahia, Brazil, also working with Computational Modeling (CM) and HPC. He holds a PhD in Environmental Engineering in the area of Atmospheric Computational Modeling, a Master in Informatics in the field of Computational Intelligence and Graduated in Computer Science from UFES. He currently coordinates, leads and participates in R&D projects in the areas of AI, computational modeling and supercomputing applied to different areas such as Oil and Gas, Health, Advanced Manufacturing, Renewable Energies and Atmospheric Sciences, advising undergraduate, master's and doctoral students. He is the Lead Researcher at SENAI CIMATEC's Reference Center on Artificial Intelligence. In addition, he is a Certified Instructor and University Ambassador of the NVIDIA Deep Learning Institute (DLI) in the areas of Deep Learning, Computer Vision, Natural Language Processing and Recommender Systems, and Principal Investigator of the NVIDIA/CIMATEC AI Joint Lab, the first in Latin America within the NVIDIA AI Technology Center (NVAITC) worldwide program. He also works as a researcher at the Supercomputing Center for Industrial Innovation (CS2i) and at the SENAI Institute of Innovation for Automation (ISI Automação), both from SENAI CIMATEC. He is a member and vice-coordinator of the Basic Board of Scientific-Technological Advice and Evaluation, in the area of Innovation, of the Foundation for Research Support of the State of Bahia (FAPESB). He serves as Technology Transfer Coordinator and one of the Principal Investigators at the National Applied Research Center in Artificial Intelligence (CPA-IA) of SENAI CIMATEC, focusing on Industry, being one of the six CPA-IA in Brazil approved by MCTI / FAPESP / CGI.br. He also participates as one of the representatives of Brazil in the BRICS Innovation Collaboration Working Group on HPC, ICT and AI. He is the coordinator of the Work Group of the Axis 5 - Workforce and Training - of the Brazilian Strategy for Artificial Intelligence (EBIA), and member of the MCTI/EMBRAPII AI Innovation Network Training Committee. He is the coordinator, by SENAI CIMATEC, of the Artificial Intelligence Reference Network of the State of Bahia (REDE BAH.IA). He leads the working group of experts representing Brazil in the Global Partnership on Artificial Intelligence (GPAI), on the theme \"AI and the Pandemic Response\".",institutionString:"Manufacturing and Technology Integrated Campus – SENAI CIMATEC",institution:null},{id:"1063",title:"Prof.",name:"Constantin",middleName:null,surname:"Volosencu",slug:"constantin-volosencu",fullName:"Constantin Volosencu",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/1063/images/system/1063.png",biography:"Prof. Dr. Constantin Voloşencu graduated as an engineer from\nPolitehnica University of Timișoara, Romania, where he also\nobtained a doctorate degree. He is currently a full professor in\nthe Department of Automation and Applied Informatics at the\nsame university. Dr. Voloşencu is the author of ten books, seven\nbook chapters, and more than 160 papers published in journals\nand conference proceedings. He has also edited twelve books and\nhas twenty-seven patents to his name. He is a manager of research grants, editor in\nchief and member of international journal editorial boards, a former plenary speaker, a member of scientific committees, and chair at international conferences. His\nresearch is in the fields of control systems, control of electric drives, fuzzy control\nsystems, neural network applications, fault detection and diagnosis, sensor network\napplications, monitoring of distributed parameter systems, and power ultrasound\napplications. He has developed automation equipment for machine tools, spooling\nmachines, high-power ultrasound processes, and more.",institutionString:'"Politechnica" University Timişoara',institution:null},{id:"221364",title:"Dr.",name:"Eneko",middleName:null,surname:"Osaba",slug:"eneko-osaba",fullName:"Eneko Osaba",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/221364/images/system/221364.jpg",biography:"Dr. Eneko Osaba works at TECNALIA as a senior researcher. He obtained his Ph.D. in Artificial Intelligence in 2015. He has participated in more than twenty-five local and European research projects, and in the publication of more than 130 papers. He has performed several stays at universities in the United Kingdom, Italy, and Malta. Dr. Osaba has served as a program committee member in more than forty international conferences and participated in organizing activities in more than ten international conferences. He is a member of the editorial board of the International Journal of Artificial Intelligence, Data in Brief, and Journal of Advanced Transportation. He is also a guest editor for the Journal of Computational Science, Neurocomputing, Swarm, and Evolutionary Computation and IEEE ITS Magazine.",institutionString:"TECNALIA Research & Innovation",institution:{name:"Tecnalia",country:{name:"Spain"}}},{id:"275829",title:"Dr.",name:"Esther",middleName:null,surname:"Villar-Rodriguez",slug:"esther-villar-rodriguez",fullName:"Esther Villar-Rodriguez",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/275829/images/system/275829.jpg",biography:"Dr. Esther Villar obtained a Ph.D. in Information and Communication Technologies from the University of Alcalá, Spain, in 2015. She obtained a degree in Computer Science from the University of Deusto, Spain, in 2010, and an MSc in Computer Languages and Systems from the National University of Distance Education, Spain, in 2012. Her areas of interest and knowledge include natural language processing (NLP), detection of impersonation in social networks, semantic web, and machine learning. Dr. Esther Villar made several contributions at conferences and publishing in various journals in those fields. Currently, she is working within the OPTIMA (Optimization Modeling & Analytics) business of TECNALIA’s ICT Division as a data scientist in projects related to the prediction and optimization of management and industrial processes (resource planning, energy efficiency, etc).",institutionString:"TECNALIA Research & Innovation",institution:{name:"Tecnalia",country:{name:"Spain"}}},{id:"49813",title:"Dr.",name:"Javier",middleName:null,surname:"Del Ser",slug:"javier-del-ser",fullName:"Javier Del Ser",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/49813/images/system/49813.png",biography:"Prof. Dr. Javier Del Ser received his first PhD in Telecommunication Engineering (Cum Laude) from the University of Navarra, Spain, in 2006, and a second PhD in Computational Intelligence (Summa Cum Laude) from the University of Alcala, Spain, in 2013. He is currently a principal researcher in data analytics and optimisation at TECNALIA (Spain), a visiting fellow at the Basque Center for Applied Mathematics (BCAM) and a part-time lecturer at the University of the Basque Country (UPV/EHU). His research interests gravitate on the use of descriptive, prescriptive and predictive algorithms for data mining and optimization in a diverse range of application fields such as Energy, Transport, Telecommunications, Health and Industry, among others. In these fields he has published more than 240 articles, co-supervised 8 Ph.D. theses, edited 6 books, coauthored 7 patents and participated/led more than 40 research projects. He is a Senior Member of the IEEE, and a recipient of the Biscay Talent prize for his academic career.",institutionString:"Tecnalia Research & Innovation",institution:{name:"Tecnalia",country:{name:"Spain"}}},{id:"278948",title:"Dr.",name:"Carlos Pedro",middleName:null,surname:"Gonçalves",slug:"carlos-pedro-goncalves",fullName:"Carlos Pedro Gonçalves",position:null,profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bRcmyQAC/Profile_Picture_1564224512145",biography:'Carlos Pedro Gonçalves (PhD) is an Associate Professor at Lusophone University of Humanities and Technologies and a researcher on Complexity Sciences, Quantum Technologies, Artificial Intelligence, Strategic Studies, Studies in Intelligence and Security, FinTech and Financial Risk Modeling. He is also a progammer with programming experience in:\n\nA) Quantum Computing using Qiskit Python module and IBM Quantum Experience Platform, with software developed on the simulation of Quantum Artificial Neural Networks and Quantum Cybersecurity;\n\nB) Artificial Intelligence and Machine learning programming in Python;\n\nC) Artificial Intelligence, Multiagent Systems Modeling and System Dynamics Modeling in Netlogo, with models developed in the areas of Chaos Theory, Econophysics, Artificial Intelligence, Classical and Quantum Complex Systems Science, with the Econophysics models having been cited worldwide and incorporated in PhD programs by different Universities.\n\nReceived an Arctic Code Vault Contributor status by GitHub, due to having developed open source software preserved in the \\"Arctic Code Vault\\" for future generations (https://archiveprogram.github.com/arctic-vault/), with the Strategy Analyzer A.I. module for decision making support (based on his PhD thesis, used in his Classes on Decision Making and in Strategic Intelligence Consulting Activities) and QNeural Python Quantum Neural Network simulator also preserved in the \\"Arctic Code Vault\\", for access to these software modules see: https://github.com/cpgoncalves. He is also a peer reviewer with outsanding review status from Elsevier journals, including Physica A, Neurocomputing and Engineering Applications of Artificial Intelligence. Science CV available at: https://www.cienciavitae.pt//pt/8E1C-A8B3-78C5 and ORCID: https://orcid.org/0000-0002-0298-3974',institutionString:"University of Lisbon",institution:{name:"Universidade Lusófona",country:{name:"Portugal"}}},{id:"241400",title:"Prof.",name:"Mohammed",middleName:null,surname:"Bsiss",slug:"mohammed-bsiss",fullName:"Mohammed Bsiss",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/241400/images/8062_n.jpg",biography:null,institutionString:null,institution:null},{id:"276128",title:"Dr.",name:"Hira",middleName:null,surname:"Fatima",slug:"hira-fatima",fullName:"Hira Fatima",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/276128/images/14420_n.jpg",biography:"Dr. Hira Fatima\nAssistant Professor\nDepartment of Mathematics\nInstitute of Applied Science\nMangalayatan University, Aligarh\nMobile: no : 8532041179\nhirafatima2014@gmal.com\n\nDr. Hira Fatima has received his Ph.D. degree in pure Mathematics from Aligarh Muslim University, Aligarh India. Currently working as an Assistant Professor in the Department of Mathematics, Institute of Applied Science, Mangalayatan University, Aligarh. She taught so many courses of Mathematics of UG and PG level. Her research Area of Expertise is Functional Analysis & Sequence Spaces. She has been working on Ideal Convergence of double sequence. She has published 17 research papers in National and International Journals including Cogent Mathematics, Filomat, Journal of Intelligent and Fuzzy Systems, Advances in Difference Equations, Journal of Mathematical Analysis, Journal of Mathematical & Computer Science etc. She has also reviewed few research papers for the and international journals. She is a member of Indian Mathematical Society.",institutionString:null,institution:null},{id:"414880",title:"Dr.",name:"Maryam",middleName:null,surname:"Vatankhah",slug:"maryam-vatankhah",fullName:"Maryam Vatankhah",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Borough of Manhattan Community College",country:{name:"United States of America"}}},{id:"414879",title:"Prof.",name:"Mohammad-Reza",middleName:null,surname:"Akbarzadeh-Totonchi",slug:"mohammad-reza-akbarzadeh-totonchi",fullName:"Mohammad-Reza Akbarzadeh-Totonchi",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Ferdowsi University of Mashhad",country:{name:"Iran"}}},{id:"414878",title:"Prof.",name:"Reza",middleName:null,surname:"Fazel-Rezai",slug:"reza-fazel-rezai",fullName:"Reza Fazel-Rezai",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"American Public University System",country:{name:"United States of America"}}},{id:"426586",title:"Dr.",name:"Oladunni A.",middleName:null,surname:"Daramola",slug:"oladunni-a.-daramola",fullName:"Oladunni A. Daramola",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Federal University of Technology",country:{name:"Nigeria"}}},{id:"357014",title:"Prof.",name:"Leon",middleName:null,surname:"Bobrowski",slug:"leon-bobrowski",fullName:"Leon Bobrowski",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Bialystok University of Technology",country:{name:"Poland"}}},{id:"302698",title:"Dr.",name:"Yao",middleName:null,surname:"Shan",slug:"yao-shan",fullName:"Yao Shan",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Dalian University of Technology",country:{name:"China"}}},{id:"354126",title:"Dr.",name:"Setiawan",middleName:null,surname:"Hadi",slug:"setiawan-hadi",fullName:"Setiawan Hadi",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Padjadjaran University",country:{name:"Indonesia"}}},{id:"125911",title:"Prof.",name:"Jia-Ching",middleName:null,surname:"Wang",slug:"jia-ching-wang",fullName:"Jia-Ching Wang",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"National Central University",country:{name:"Taiwan"}}},{id:"332603",title:"Prof.",name:"Kumar S.",middleName:null,surname:"Ray",slug:"kumar-s.-ray",fullName:"Kumar S. Ray",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Indian Statistical Institute",country:{name:"India"}}},{id:"415409",title:"Prof.",name:"Maghsoud",middleName:null,surname:"Amiri",slug:"maghsoud-amiri",fullName:"Maghsoud Amiri",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Allameh Tabataba'i University",country:{name:"Iran"}}},{id:"357085",title:"Mr.",name:"P. Mohan",middleName:null,surname:"Anand",slug:"p.-mohan-anand",fullName:"P. Mohan Anand",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Indian Institute of Technology Kanpur",country:{name:"India"}}},{id:"356696",title:"Ph.D. Student",name:"P.V.",middleName:null,surname:"Sai Charan",slug:"p.v.-sai-charan",fullName:"P.V. Sai Charan",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Indian Institute of Technology Kanpur",country:{name:"India"}}},{id:"357086",title:"Prof.",name:"Sandeep K.",middleName:null,surname:"Shukla",slug:"sandeep-k.-shukla",fullName:"Sandeep K. Shukla",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Indian Institute of Technology Kanpur",country:{name:"India"}}}]}},subseries:{item:{id:"87",type:"subseries",title:"Economics",keywords:"Globalization, Economic Integration, Growth and Development, International Trade, Environmental Development, Developed Countries, Developing Countries, Technical Innovation, Knowledge Management, Political Economy Analysis, Banking and Financial Markets",scope:"
\r\n\tThe topic on Economics is designed to disseminate knowledge around broad global economic issues. Original submissions will be accepted in English for applied and theoretical articles, case studies and reviews about the specific challenges and opportunities faced by the economies and markets around the world. The authors are encouraged to apply rigorous economic analysis with significant policy implications for developed and developing countries. Examples of subjects of interest will include, but are not limited to globalization, economic integration, growth and development, international trade, environmental development, country specific comparative analysis, technical innovation and knowledge management, political economy analysis, and banking and financial markets.
",coverUrl:"https://cdn.intechopen.com/series_topics/covers/87.jpg",hasOnlineFirst:!1,hasPublishedBooks:!1,annualVolume:11971,editor:{id:"327730",title:"Prof.",name:"Jaime",middleName:null,surname:"Ortiz",slug:"jaime-ortiz",fullName:"Jaime Ortiz",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0033Y00002zaOKZQA2/Profile_Picture_1642145584421",biography:"Dr. Jaime Ortiz holds degrees from Chile, the Netherlands, and the United States. He has held tenured faculty, distinguished professorship, and executive leadership appointments in several universities around the world. Dr. Ortiz has previously worked for international organizations and non-government entities in economic and business matters, and he has university-wide globalization engagement in more than thirty-six countries. He has advised, among others, the United Nations Development Program, Inter-American Development Bank, Organization of American States, Pre-investment Organization of Latin America and the Caribbean, Technical Cooperation of the Suisse Government, and the World Bank. Dr. Ortiz is the author, co-author, or editor of books, book chapters, textbooks, research monographs and technical reports, and refereed journal articles. He is listed in Who’s Who in the World, Who’s Who in America, Who’s Who in Finance and Business, Who’s Who in Business Higher Education, Who’s Who in American Education, and Who’s Who Directory of Economists. Dr. Ortiz has been a Fulbright Scholar and an MSI Leadership Fellow with the W.K. Kellogg Foundation. 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Chapters exploring biomaterial approaches such as polymer synthesis and characterization, drug and gene vector design, biocompatibility, immunology and toxicology, and self-assembly at the nanoscale, are welcome. Finally, the tissue engineering subcategory will support topics such as the fundamentals of stem cells and progenitor cells and their proliferation, differentiation, bioreactors for three-dimensional culture and studies of phenotypic changes, stem and progenitor cells, both short and long term, ex vivo and in vivo implantation both in preclinical models and also in clinical trials.",annualVolume:11405,isOpenForSubmission:!0,coverUrl:"https://cdn.intechopen.com/series_topics/covers/9.jpg",editor:{id:"126286",title:"Dr.",name:"Luis",middleName:"Jesús",surname:"Villarreal-Gómez",fullName:"Luis Villarreal-Gómez",profilePictureURL:"https://mts.intechopen.com/storage/users/126286/images/system/126286.jpg",institutionString:null,institution:{name:"Autonomous University of Baja California",institutionURL:null,country:{name:"Mexico"}}},editorTwo:null,editorThree:null,editorialBoard:[{id:"35539",title:"Dr.",name:"Cecilia",middleName:null,surname:"Cristea",fullName:"Cecilia Cristea",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002aYQ65QAG/Profile_Picture_1621007741527",institutionString:null,institution:{name:"Iuliu Hațieganu University of Medicine and Pharmacy",institutionURL:null,country:{name:"Romania"}}},{id:"40735",title:"Dr.",name:"Gil",middleName:"Alberto Batista",surname:"Gonçalves",fullName:"Gil Gonçalves",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002aYRLGQA4/Profile_Picture_1628492612759",institutionString:null,institution:{name:"University of Aveiro",institutionURL:null,country:{name:"Portugal"}}},{id:"211725",title:"Associate Prof.",name:"Johann F.",middleName:null,surname:"Osma",fullName:"Johann F. 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Valarmathi",profilePictureURL:"https://mts.intechopen.com/storage/users/69697/images/system/69697.jpg",institutionString:"Religen Inc. | A Life Science Company, United States of America",institution:null},{id:"205081",title:"Dr.",name:"Marco",middleName:"Vinícius",surname:"Chaud",fullName:"Marco Chaud",profilePictureURL:"https://s3.us-east-1.amazonaws.com/intech-files/0030O00002bSDGeQAO/Profile_Picture_1622624307737",institutionString:null,institution:{name:"Universidade de Sorocaba",institutionURL:null,country:{name:"Brazil"}}}]}]}},libraryRecommendation:{success:null,errors:{},institutions:[]},route:{name:"chapter.detail",path:"/chapters/29060",hash:"",query:{},params:{id:"29060"},fullPath:"/chapters/29060",meta:{},from:{name:null,path:"/",hash:"",query:{},params:{},fullPath:"/",meta:{}}}},function(){var e;(e=document.currentScript||document.scripts[document.scripts.length-1]).parentNode.removeChild(e)}()