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| 1 | Wireless Acoustic Sensor Networks and Edge Computing for Rapid Acoustic Monitoring显示文摘Passive acoustic monitoring is emerging as a promising solution to the urgent, global need for new biodiversity assessment methods. The ecological relevance of the soundscape is increasingly recognised, and the affordability of robust hardware for remote audio recording is stimulating international interest in the potential for acoustic methods for biodiversity monitoring.The scale of the data involved requires automated methods,however, the development of acoustic sensor networks capable of sampling the soundscape across time and space and relaying the data to an accessible storage location remains a significant technical challenge, with power management at its core. Recording and transmitting large quantities of audio data is power intensive,hampering long-term deployment in remote, off-grid locations of key ecological interest. Rather than transmitting heavy audio data, in this paper, we propose a low-cost and energy efficient wireless acoustic sensor network integrated with edge computing structure for remote acoustic monitoring and in situ analysis.Recording and computation of acoustic indices are carried out directly on edge devices built from low noise primo condenser microphones and Teensy microcontrollers, using internal FFT hardware support. Resultant indices are transmitted over a ZigBee-based wireless mesh network to a destination server.Benchmark tests of audio quality, indices computation and power consumption demonstrate acoustic equivalence and significant power savings over current solutions. | Zhengguo Sheng Saskia Pfersich Alice Eldridge Jianshan Zhou Daxin Tian Victor C.M.Leung | 2019 | IEEE/CAA Journal of Automatica Sinica2019，6，1： | 6 |
| 2 | Recent advances and future challenges for mobile network virtualization显示文摘Recently, network function virtualization(NFV) was proposed as a paradigm shift in the telecommunication industry. Both industry and academia have drawn significant attention in mobile network virtualization.NFV decouples the software implementation of network functions from the underlying hardware, leading to considerable reductions in operating expenses(OPEX) and capital expenses(CAPEX), and facilitating the network deployment. However, as an emerging technology, NFV brings both challenges and opportunities in developing new architectures, applying and deployment. In this paper, we first survey the related work of NFV, and then propose promising research directions in this area. | Xiaofeng TAO Yan HAN Xiaodong XU Ping ZHANG Victor C.M.LEUNG | 2017 | Science China(Information Sciences)2017，60，4： | 2 |
| 3 | RecCac:Recommendation-Empowered Cooperative Edge Caching for Internet of Things显示文摘Edge caching is an emerging technology for supporting massive content access in mobile edge networks to address rapidly growing Internet of Things(IoT)services and content applications.However,the edge server is limited with the computation/storage capacity,which causes a low cache hit.Cooperative edge caching jointing neighbor edge servers is regarded as a promising technique to improve cache hit and reduce congestion of the networks.Further,recommender systems can provide personalized content services to meet user’s requirements in the entertainment-oriented mobile networks.Therefore,we investigate the issue of joint cooperative edge caching and recommender systems to achieve additional cache gains by the soft caching framework.To measure the cache profits,the optimization problem is formulated as a 0-1 Integer Linear Programming(ILP),which is NP-hard.Specifically,the method of processing content requests is defined as server actions,we determine the server actions to maximize the quality of experience(QoE).We propose a cachefriendly heuristic algorithm to solve it.Simulation results demonstrate that the proposed framework has superior performance in improving the QoE. | HAN Suning LI Xiuhua SUN Chuan WANG Xiaofei Victor C.M.LEUNG | 2021 | ZTE Communications2021，19，2： | 1 |
| 4 | Ultra-Dense Networking Architectures and Technologies for 5G显示文摘With the continuous enrichment of mobile communication application scenarios in the future,the traditional macro-cellular-based mobile communication network architecture will be difficult to meet the explosive growth in demand for communications services.A promising solution is the deployment of ultra dense networks(UDNs) | victor c.m.leung zhang haijun | 2018 | ZTE Communications2018，16，2： | 1 |
| 5 | 相关阴影衰落信道下复合分集系统的中断概率(英文)显示文摘The outage probability of a composite microscopic and macroscopic diversity system is evaluated over correlated shadowed fading channels.The correlations on both a microlevel and macrolevel are taken into account for the evaluations.The expression of the desired outage probability is explicitly presented,and two evaluation approaches,i.e.a compact Gaussian-Hermite quadrature method and an effective iterative algorithm,are proposed.The accuracy and efficiency of the proposed approaches are analysed,and a guideline is provided for their application.By employing the proposed evaluation approaches,results and demonstrations are presented,which display the implied effects of the corresponding parameters on the system outage performance,and reveal the potential to facilitate the design and analysis of such composite diversity systems. | 张锐 魏急波 Victor C.M.Leung | 2013 | China Communications2013，10，11： | 0 |
| 6 | Editor's note显示文摘Along with the flourishing development of information science,the Internet has realized the interconnections among the ubiquitous entities in the cyber space.It brings the unceasing expansion of the interactive data,information,knowledge,and services.The frontier information science is expected to imitate the heuristic intelligence,including human cognition(e.g.attention,emotion,and wisdom)and natural attributes(e.g.,dynamics,and self-adaptability),to promote the evolution of the information techniques.Accordingly,Cybermatics(i.e.,cyberscienceand technology)emerges as an interdisciplinary involving three main aspects:the Internet of Things(IoT),cyber,physical and social computing,and green computing and communications. | HuanSheng NING JianHua MA Laurence T.YANG WeiFeng L XinDong WU Victor C.M.LEUNG Vincenzo PIURI | 2014 | Science China(Information Sciences)2014，57，3： | 0 |
| 7 | Subcarrier Intensity Modulated Optical Wireless Communications:A Survey from Communication Theory Perspective显示文摘Subcarrier intensity modulation with direct detection is a modulation/detection technique for optical wireless communication systems,where a pre-modulated and properly biased radio frequency signal is modulated on the intensity of the optical carrier.The most important benefits of subcarrier intensity modulation are as follows:1) it does not provide irreducible error floor like the conventional on-off keying intensity modulation with a fixed detection threshold;2) it provides improved spectral efficiency and supports higher order modulation schemes;and 3) it has much less implementation complexity compared to coherent optical wireless communications with heterodyne or homodyne detection.In this paper,we present an up-to-date review of subcarrier intensity modulated optical wireless communication systems.We survey the error rate and outage performance of subcarrier intensity modulations in the atmospheric turbulence channels considering different modulation and coding schemes.We also explore different contemporary atmospheric turbulence fading mitigation solutions that can be employed for subcarrier intensity modulation.These solutions include diversity combining,adaptive transmission,relay assisted transmission,multiple-subcarrier intensity modulations,and optical orthogonal frequency division multiplexing.Moreover,we review the performance of subcarrier intensity modulations due to the pointing error and synchronization error. | Md.Zoheb Hassan Md.Jahangir Hossain Julian Cheng Victor C.M.Leung | 2016 | ZTE Communications2016，14，2： | 0 |
| 8 | Evolutionary Algorithms in Software Defined Networks: Techniques, Applications, and Issues显示文摘A software defined networking(SDN) system has a logically centralized control plane that maintains a global network view and enables network-wide management, optimization, and innovation. Network-wide management and optimization problems are typicallyvery complex with a huge solution space, large number of variables, and multiple objectives. Heuristic algorithms can solve theseproblems in an acceptable time but are usually limited to some particular problem circumstances. On the other hand, evolutionaryalgorithms(EAs), which are general stochastic algorithms inspired by the natural biological evolution and/or social behavior of species, can theoretically be used to solve any complex optimization problems including those found in SDNs. This paper reviewsfour types of EAs that are widely applied in current SDNs: Genetic Algorithms(GAs), Particle Swarm Optimization(PSO), Ant Colony Optimization(ACO), and Simulated Annealing(SA) by discussing their techniques, summarizing their representative applications, and highlighting their issues and future works. To the best of our knowledge, our work is the first that compares the tech-niques and categorizes the applications of these four EAs in SDNs. | LIAO Lingxia Victor C.M.Leung LAI Chin-Feng | 2017 | ZTE Communications2017，15，3： | 0 |
| 9 | Anchor Vertex Selection for Enhanced Reliability of Traffic Offloading Service in Edge-Enabled Mobile P2P Social Networks显示文摘As the rapid growth of mobile social networks,mobile peer-to-peer(P2P)communications and mobile edge computing(MEC)have been developed to reduce the traffic load and improve the computation capacity of cellular networks.However,the stability of social network is largely ignored in the advances of P2P and MEC,which is related to the social relations between users.It plays a vital role in improving the efficiency and reliability of traffic offloading service.In this paper,we integrate an edge node and the nearby P2P users as a mobile P2P social network and introduce the problem of adaptive anchored(k,r)-core to maintain the stability of multiple mobile P2P networks.It aims to adaptively select and retain a set of critical users for each network,whose participation is critical to overall stability of the network,and allocate certain resource for them so that the maximum number of users of all networks will remain engaged and the traffic of cellular network can be minimized.We called the retained users as anchor vertices.To address it,we devise a peer-edge-cloud framework to achieve the adaptive allocation of resources.We also develop a similarity based onion layers anchored(k,r)-core(S-OLAK)algorithm to explore the anchor vertices.Experimental results based on a real large-scale mobile P2P data set demonstrate the effectiveness of our method. | Hengda Zhang Xiaofei Wang Hao Fan Taotao Cai Jianxin Li Xiuhua Li Victor C.M.Leung | 2020 | Journal of Communications and Information Networks2020，5，2： | 0 |
| 10 | Special Focus on Machine-Type Communications显示文摘Machine-type communication(MTC)refers to the communication between devices with or without the involvement of the network infrastructure.In recent years,we have witnessed a rapid penetration of embedded devices;and we believed that MTC traffic is likely to predominate in future and has the | Xiaofeng TAO Ping ZHANG Victor C.M.LEUNG Songwu LU Yu CHEN | 2017 | Science China(Information Sciences)2017，60，10： | 0 |
| 11 | Wireless Body Area Networks for Pervasive Healthcare and Smart Environments显示文摘Wireless body area networks(WBANs)use RF communication for interconnection of tiny sensor nodes located in,on,or in close proximity to the human body.A WBAN enables physiological signals,physical activity,and body position to be continuously monitored.Designing a WBAN is challenging because of the limited energy that a WBAN can consume and the limited processing capabilities of sensor nodes.Also,the radio communication environment is highly variable and prone to interference.Recent ad- | Victor C.M.Leung Hongke Zhang | 2014 | ZTE Communications2014，12，3： | 0 |
| 12 | Arm PSA-Certified IoT Chip Security: A Case Study显示文摘With the large scale adoption of Internet of Things(IoT)applications in people’s lives and industrial manufacturing processes,IoT security has become an important problem today.IoT security significantly relies on the security of the underlying hardware chip,which often contains critical information,such as encryption key.To understand existing IoT chip security,this study analyzes the security of an IoT security chip that has obtained an Arm Platform Security Architecture(PSA)Level 2 certification.Our analysis shows that the chip leaks part of the encryption key and presents a considerable security risk.Specifically,we use commodity equipment to collect electromagnetic traces of the chip.Using a statistical T-test,we find that the target chip has physical leakage during the AES encryption process.We further use correlation analysis to locate the detailed encryption interval in the collected electromagnetic trace for the Advanced Encryption Standard(AES)encryption operation.On the basis of the intermediate value correlation analysis,we recover half of the 16-byte AES encryption key.We repeat the process for three different tests;in all the tests,we obtain the same result,and we recover around 8 bytes of the 16-byte AES encryption key.Therefore,experimental results indicate that despite the Arm PSA Level 2 certification,the target security chip still suffers from physical leakage.Upper layer application developers should impose strong security mechanisms in addition to those of the chip itself to ensure IoT application security. | Fei Chen Duming Luo Jianqiang Li Victor C.M.Leung Shiqi Li Junfeng Fan | 2023 | Tsinghua Science and Technology2023，28，2： | 0 |
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