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VEAD: Variance profile Exploitation for Anomaly Detection in real-time IoT data streaming

The explosion of online streaming services in the Internet-of-Things (IoT) ecosystem poses new difficulties in detecting anomalies in real-time and continuous data. The IoT data anomalies are classified into long-term and short-term, with unique characteristics that make it difficult to develop a common detection mechanism for both. The existing techniques require excessive training data and suffer from high variability. This paper overcomes these challenges by proposing a Variance profile Exploitation for Anomaly Detection (VEAD) scheme using discrete wavelet transform and k-means clustering. VEAD is initialized by a fast training phase with a single data segment, from which a sensor variance profile is created. This variance profile reflects the degree of deviation in the collected data from different sensors at a specific time period and is continuously updated by integrating new data segments for effective anomaly detection. Overlapping data collection in the detection phase shows correlations among consecutive data segments, leading to improved detection accuracy (ACC). The Intel Berkeley Research Lab dataset with injected synthetic anomalies is used to perform numerical experiments. A comparative performance evaluation with state-of-the-art methods confirms the effectiveness of VEAD in achieving a higher ACC and a lower false-positive rate (FPR). Notably, 95% and 97% ACCs are achieved in detecting long-term and short-term anomalies, respectively. The high specificity of VEAD is also revealed by the low FPR of at most 2% in all cases. The low computational complexity and fast anomaly detection make VEAD suitable for deployment in live systems with massive data streams.

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Deep Mobile Path Prediction With Shift-and-Join and Carry-Ahead

Importance of user mobility has rapidly increased in 5G due to reduced cell sizes, management of Multi-access Edge Computing (MEC), and ultra-low latency services. Reactive nature of existing management systems is a bottleneck, and it can be solved by building proactive systems that exploit temporal characteristics of time-series mobility data to predict long-term user movement (i.e.path). However, user mobile path prediction with useable accuracy is a challenging task, particularly for lengthy target trajectories. This paper adopts general approaches to propose two models for predicting mobile path with high accuracy. Step Forward Iteration (SFI) model is based on recursive approach, whereas Encoder-Decoder (ED) model follows multi-output approach, and both the models use Long-Short Term Memory (LSTM) as the learning unit. Training and testing of these models is done on mobility datasets from the wireless network of Pangyo ICT Research Center, Korea and one of the Korean mobile operators. The experiment results show viability of the proposed models for leveraging mobile network management, as they outperform state-of-the-art GRU with attention (GRU-ATTN) and Transformer Network (TN) models. The highest prediction accuracies achieved for 3, 5, and 7 steps of target sequences (i.e.predicted mobile path) in the campus dataset are 96%, 90%, and 87%, respectively.

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Is board-tie among rivals harmful to customers? Evidence from banks’ project-financing consortium

Purpose: Are board ties among competitors harmful to customers? The prevalent assumption on board ties among competitors is that they harm customer benefits. This study examines the mechanism by which board ties with competitors result in an outcome conducive to customers.Design/methodology/approach: Based on a sample of 79 savings banks in South Korea, we investigate the extent of banks’ board ties with other banks and their engagement in a project financing (PF) consortium from 2014 to 2020. The generalised least square was adopted to test the hypotheses. We also performed several supplemental analyses to further support our results.Findings/results: Savings banks with greater board ties with rivals provided more financial opportunities to their customers by forming PF consortia more actively with other banks. Furthermore, the positive impact of board ties on banks’ participation in a PF consortium increases, especially when the proportion of external shareholders is smaller or when savings banks are family firms.Practical implications: Outside directors can not only play the role of monitoring the management but also serve as assistants who can help banks provide financial services (or products) that banks could not provide individually.Originality/value: While prior studies have clearly recognised the negative impacts on customers of board-friendship ties among rivals, little attention has been paid to the potential mechanism by which board ties among competing firms can benefit customers. This study challenges the dominant assumption by demonstrating that savings banks with greater board ties with other banks provide more financial opportunities to their economically weak customers.Contribution: Finally, this study contributes to the family business literature by providing insight into how the unique characteristics of family firms in strategic choices make outside directors contribute as assistants than supervisors.

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