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Research in financial domain has shown that sentiment aspects of stock news have a profound impact on volume trades, volatility, stock prices and firm earnings. In-depth analysis of stock news is now sourced from financial reviews by various social networking and marketing sites to help improve decision making. Nonetheless, such reviews are in the form of unstructured text, which requires natural language processing (NLP) in order to extract the sentiments. Accordingly, in this study we investigate the use of NLP tasks in effort to improve the performance of sentiment classification in evaluating the information content of financial news as an instrument in investment decision support system. At present, feature extraction approach is mainly based on the occurrence frequency of words. Therefore low-frequency linguistic features that could be critical in sentiment classification are typically ignored. In this research, we attempt to improve current sentiment analysis approaches for financial news classification by focusing on low-frequency but informative linguistic expressions. Our proposed combination of low and high-frequency linguistic expressions contributes a novel set of features for sentiment classification. The experimental results show that an optimal Ngram feature selection (combination of optimal unigram and bigram features) enhances sentiment classification accuracy as compared to other types of feature sets. [ABSTRACT FROM AUTHOR]

Redundant and irrelevant features in data have caused a long-term problem in network traffic classification. These features not only slow down the process of classification but also prevent a classifier from making accurate decisions, especially when coping with big data. In this paper, we propose a mutual information based algorithm that analytically selects the optimal feature for classification. This mutual information based feature selection algorithm can handle linearly and nonlinearly dependent data features. Its effectiveness is evaluated in the cases of network intrusion detection. An Intrusion Detection System (IDS), named Least Square Support Vector Machine based IDS (LSSVM-IDS), is built using the features selected by our proposed feature selection algorithm. The performance of LSSVM-IDS is evaluated using three intrusion detection evaluation datasets, namely KDD Cup 99, NSL-KDD and Kyoto 2006+ dataset. The evaluation results show that our feature selection algorithm contributes more critical features for LSSVM-IDS to achieve better accuracy and lower computational cost compared with the state-of-the-art methods. [ABSTRACT FROM AUTHOR]

Potential topics include but are not limited to the following: (1) Security machine learning modelling and architecture (2) Secure multiparty computation techniques for machine learning (3) Attacks against machine learning (4) Machine learning threat intelligence (5) Machine learning for cybersecurity (6) Machine learning for intrusion detection and response (7) Machine learning for multimedia data security (8) Machine learning for public safety After a thorough review process, this special issue has selected a set of eight papers to provide new insights on the abovementioned research areas. Machine learning (ML) has recently gained a renewed interest as the technology powering it has become more widely available and accessible to organizations of all sizes. [Extracted from the article]

Industrial Control Systems (ICS) are hardware, network, and software, upon which a facility depends to allow daily operations to function. In most cases society takes the operation of such systems, for example public transport, tap water or electricity, for granted. However, the disruption of those systems might have serious consequences across different sectors. In this paper, we propose a supervised energy-based approach for anomaly detection in a clean water supply system using a new dataset which is physically modelled in the Festo MPA workstation rig. The novelty relies on the set of engineered features collected from the testbed, including voltage, current and power from the sensors that compose the ICS. These values are obtained from independent current sensors that we have physically wired to the testbed. Five machine learning algorithms; Support Vector Machine, k-Nearest Neighbours, Multilayer Perceptron, Decision Tree and Random Forest are employed to evaluate the effectiveness of our proposed features. The metrics used to present the performance of the selected machine learning algorithms are F1-Score, G-Mean, False Positive Rate (FPR) and False Negative Rate (FNR). The results show that machine learning algorithms can classify the variations of energy produced by the execution of cyber-attacks as anomalous by achieving 95.5% F1-Score, and 6.8% FNR with the Multilayer Perceptron classifier. [ABSTRACT FROM AUTHOR]