In recent years, the scale of networks has substantially evolved due to the rapid development of infrastructures in real networks. Under the circumstances, intrusion detection systems (IDSs) have become the crucial tool to detect cyberattacks, malicious actions, and anomaly behaviors that threaten the credibility and integrity of information services in networks. The feature selection technologies are commonly applied in various intrusion detection algorithms owing to the potential of improving performance and speeding up decision-making. However, existing feature selection-based intrusion detection methods still suffer from high computational complexity or the lack of robustness. To mitigate these challenges, we propose a novel ensemble feature selection-based deep neural network (EFS-DNN) to detect attacks in networks with high-volume traffic data. In particular, we leverage light gradient boosting machine (LightGBM) as the base selector in the ensemble feature selection module to enhance the robustness of the selected optimal subset. Besides, we utilize a deep neural network with batch normalization and embedding technique as the classifier to improve the expressiveness. We conduct extensive experiments on three public datasets to demonstrate the superiority of the EFS-DNN compared with baselines.

Restaurant recommendation is one of the most recommendation problems because the result of recommendation varies in different environments. Many methods have been proposed to recommend restaurants in a mobile environment by considering user preference, restaurant attributes, and location. However, there are few restaurant recommender systems according to the internet of vehicles environment. This paper presents a recommender system based on the prediction of traffic conditions in the internet of vehicles environment. This recommender system uses a phased selection method to recommend restaurants. The first stage is to screen restaurants that are on the user’s driving route; the second stage is to recommend restaurants from the user attributes, restaurant attributes (with traffic conditions), and vehicle context, using a deep learning model. The experimental evaluation shows that the proposed recommender system is both efficient and effective.

Airlines have launched various ancillary services to meet their passengers’ requirements and to increase their revenue. Ancillary revenue from seat selection is an important source of revenue for airlines and is a common type of advertisement. However, advertisements are generally delivered to all customers, including a significant proportion of people who do not wish to pay for seat selection. Random advertisements may thus decrease the amount of profit generated since users will tire of useless advertising, leading to a decrease in user stickiness. To solve this problem, we propose a Bagging in Certain Ratio Light Gradient Boosting Machine (BCR-LightGBM) to predict the willingness of passengers to pay to choose their seats. The experimental results show that the proposed model outperforms all 12 comparison models in terms of the area under the receiver operating characteristic curve (ROC-AUC) and F1-score. Furthermore, we studied two typical samples to demonstrate the decision-making phase of a decision tree in BCR-LightGBM and applied the Shapley additive explanation (SHAP) model to analyse the important influencing factors to further enhance the interpretability. We conclude that the customer’s values, the ticket fare, and the length of the trip are three factors that airlines should consider in their seat selection service.

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