Bøger af Wei Ren

Internet of Things (IoT) has been attracted more and more attentions in both academy and industry recently. It is envisioned as a key technology for extending traditional interconnection of human to interconnection of physical objects such as sensors, RFID tags, and mobile smart phones. A lot of novel applications come, e.g., smart grid, machine-to-machine (M2M), mobile cloud computing, EPCglobal networks, unattended wireless sensor networks, and mobile social networks. The security in those typical IoT applications is of upmost importance for their deployment in reality. In different applications, the security requirements or concentrations are various and challenges are distinct, e.g., privacy protection, trust management, authentication, key management, confidentiality, to name a few. This book analyzes the most important security requirements and proposes corresponding security solutions for those applications. In particular, all solutions are lightweight in terms of computation (communication) and robust in terms of resilience to compromising, so as to tackle corresponding challenges in different applications of IoT.

The book assists the implementation of such applications by promoting the ability of multi-agent systems to track - using local communication only - the mean value of signals of interest, even when these change rapidly with time and when no individual agent has direct access to the average signal across the whole team;

Pragmatic competence plays a key role in intercultural communication, particularly for students studying in a target community. This book investigates the effect of study abroad on second language learners' productive and receptive pragmatic competences, as well as their cognitive processes during speech act production. It employs a variety of research instruments, both quantitative and qualitative, to explore learners' pragmatic development over one year. The inclusion of a control group is a methodological strength of the longitudinal study, many such studies often not including a control group. In addition, the study longitudinally examines learners' cognitive processes during study abroad with innovative and insightful analyses. The book makes an important contribution to second language pragmatics with regard to developmental changes in both speech act production and perception during such processes.

Assuming only neighbor-neighbor interaction among vehicles, this monograph develops distributed consensus strategies that ensure that the information states of all vehicles in a network converge to a common value. Readers learn to deal with groups of autonomous vehicles in aerial, terrestrial, and submarine environments.

Distributed Coordination of Multi-agent Networks introduces problems, models, and issues such as collective periodic motion coordination, collective tracking with a dynamic leader, and containment control with multiple leaders. Solving these problems extends the existing application domains of multi-agent networks.