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The proliferation of IoTs beside the emergence of various cloud services push the horizon of edge computing. By offering cloud capabilities at the network edge closer to mobile devices, edge computing is a promising paradigm to resolve several vital challenges in IoTs, such as bandwidth saturation, energy constraints, low latency transmission, and data security and privacy. To provide a comprehensive understanding of edge computing supported by the integration of IoTs and cloud computing, that is, CoTs, this article first discusses some distinct research directions in CoTs with respect to edge computing. Given the significance of energy efficiency and sustainability of edge deployment in CoTs, we put forward a green and sustainable virtual network embedding framework for cooperative edge computing in wireless-optical broadband access networks. Specifically, we leverage a reliability function to confirm the number of backup edge devices, and embed virtual networks onto the suitable edge devices in CoTs. Finally, several research challenges and open issues are discussed. [ABSTRACT FROM AUTHOR]

As an emerging platform based on ITS, SIoV is promising for applications of traffic management and road safety in smart cities. However, the endto- end delay is large in store-carry-and-forwardbased vehicular networks, which has become the main obstacle for the implementation of large-scale SIoV. With the extensive applications of mobile devices, crowdsensing is promising to enable realtime content dissemination in a city-wide traffic management system. This article first provides an overview of several promising research areas for traffic management in SIoV. Given the significance of traffic management in urban areas, we investigate a crowdsensing-based framework to provide timely response for traffic management in heterogeneous SIoV. The participant vehicles based on D2D communications integrate trajectory and topology information to dynamically regulate their social behaviors according to network conditions. A real-world taxi trajectory analysis-based performance evaluation is provided to demonstrate the effectiveness of the designed framework. Furthermore, we discuss several future [ABSTRACT FROM AUTHOR]

Vehicular transportation is an essential part of modern cities. However, the ever increasing number of road accidents, traffic congestion, and other such issues become obstacles for the realization of smart cities. As the integration of the Internet of Vehicles and social networks, vehicular social networks (VSNs) are promising to solve the above-mentioned problems by enabling smart mobility in modern cities, which are likely to pave the way for sustainable development by promoting transportation efficiency. In this article, the definition of and a brief introduction to VSNs are presented first. Existing supporting communication technologies are then summarized. Furthermore, we introduce an application scenario on trajectory data-analysis-based traffic anomaly detection for VSNs. Finally, several research challenges and open issues are highlighted and discussed. [ABSTRACT FROM PUBLISHER]

Design flaws and unseen vulnerabilities in the photonic network-on-chip (PNoC) have made it a focal point of potential security attacks. Previous works well investigate remote attacks launched outside from electrical NoCs. However, it is still a challenge to find possible threats and efficient countermeasures for PNoCs. In PNoCs, for example, micro resonators can be maliciously controlled by a remote attacker to miss expected tuning function, thus leading to data loss and information disclosure. In this article, we first summarize remote denial of service attacks caused by hardware Trojan insertion and timing channel in NoCs. We then show that these two kinds of remote attacks are also effective threat models in PNoCs. We design, for the first time, countermeasures protecting against threat models in the hybrid wavelength and mode division multiplexing PNoC. Finally, we propose the challenging issues of enhancing the safety of the 3D PNoC under new potential threats. [ABSTRACT FROM AUTHOR]