Qian Zhang

Resonance Self-Shielding Calculation Methods in Nuclear Reactors presents the latest progress in resonance self-shielding methods for both deterministic and Mote Carlo methods, including key advances over the last decade such as high-fidelity resonance treatment, resonance interference effect and multi-group equivalence. As the demand for high-fidelity resonance self-shielding treatment is increasing due to the rapid development of advanced nuclear reactor concepts and progression in high performance computational technologies, this practical book guides students and professionals in nuclear engineering and technology through various methods with proven high precision and efficiency.

Recommender systems provide users (businesses or individuals) with personalized online recommendations of products or information, to address the problem of information overload and improve personalized services. Recent successful applications of recommender systems are providing solutions to transform online services for e-government, e-business, e-commerce, e-shopping, e-library, e-learning, e-tourism, and more.This unique compendium not only describes theoretical research but also reports on new application developments, prototypes, and real-world case studies of recommender systems. The comprehensive volume provides readers with a timely snapshot of how new recommendation methods and algorithms can overcome challenging issues. Furthermore, the monograph systematically presents three dimensions of recommender systems — basic recommender system concepts, advanced recommender system methods, and real-world recommender system applications.By providing state-of-the-art knowledge, this excellent reference text will immensely benefit researchers, managers, and professionals in business, government, and education to understand the concepts, methods, algorithms and application developments in recommender systems.

This book aims to present implications for China’s urban development through international comparison of urbanization process from the perspective of spatio-temporal pattern, driving factors, rural-urban interactions, development trends and economic-ecological-social synergic development. Followed the research hotspot of the international urban studies, this book identifies challenges and opportunities in the process of urban development through analyzing and comparing urbanization pathways of several Asian countries as for representatives. It provides both decision support for China’s urban development and management, and scientific support for the sustainable urban development in Asian countries.

When severe sandstorms swept Beijing at the beginning of this century, the importance of the land degradation issue was lifted to an unprecedented level since land degradation was seen as threatening the ‘national ecological security’. To stop the underlying ‘ecological crisis’, a large-scale ‘ecological construction’ programme was carried out. This thesis focuses on exploring ecological resettlement, a policy measure in the programme, in the pastoral context of western China. The aim is to understand environmentalisation through drawing out the politics of the formulation, implementation and effects of ecological resettlement at and across different scales. By combining insights from political ecology, environmental governance, migration, and pastoralism studies, with fieldwork, interviews, analysis of policy documents, and statistical analysis, this book provides a nuanced approach to exploring the human-environment relationship. The analysis exposes in a developmental context how the central state made grassland degradation governable, how and why the local state put emphasis more on short-term-effective solutions rather than on environmental sustainability, and how and why the pastoral households prioritised social, economic and cultural considerations over environmental concerns when making migration decisions. The study draws attention to the significant impact of ecological resettlement on Mongolian pastoralism. While further fragmented rangelands obstructed mobile pastoralism, new social arrangements enabled migrant households to remain involved with pastoralism.

This brief explores current research on dynamic spectrum auctions, focusing on fundamental auction theory, characteristics of the spectrum market, spectrum auction architecture and possible auction mechanisms. The brief explains how dynamic spectrum auctions, which enable new users to gain spectrum access and existing spectrum owners to obtain financial benefits, can greatly improve spectrum efficiency by resolving the artificial spectrum shortage. It examines why operators and users face significant challenges due to specialty of the spectrum market and the related requirements imposed on the auction mechanism design. Concise and up-to-date, Dynamic Spectrum Auction in Wireless Communication is designed for researchers and professionals in computer science or electrical engineering. Students studying networking will also find this brief a valuable resource.

This Brief introduces the wireless spectrum market and discusses the current research for spectrum auctions. It covers the unique properties of spectrum auction, such as interference relationship, reusability, divisibility, composite effect and marginal effect, while also proposing how to build economic incentives into the network architecture and protocols in order to optimize the efficiency of wireless systems. Three scenarios for designing new auctions are demonstrated. First, a truthful double auction scheme for spectrum trading considering both the heterogeneous propagation properties of channels and spatial reuse is proposed. In the second scenario, a framework is designed to enable spectrum group secondary users with a limited budget. Finally, a flexible auction is created enabling operators to purchase the right amounts of spectrum at the right prices according to their users’ dynamic demands. Both concise and comprehensive, Auction Design for the Wireless Spectrum Market is suited for professionals and researchers working with wireless communications and networks. It is also a useful tool for advanced-level students interested in spectrum and networking issues.

This brief focuses on the current research on location privacy preservation in cognitive radio networks (CRNs). Along with a review of the existing works, this book includes fundamental privacy models, possible frameworks, useful performance, and future research directions. It explores privacy preservation techniques, collaborative spectrum sensing, database-driven CRNS, and modeling potential privacy threats. Conflicts between database owners and unlicensed users can compromise location privacy, and CRNs are a means to mitigate the spectrum scarcity issue due to the increasing demand for wireless channel resources. By examining the current and potential privacy threats, the authors equip readers to understand this developing issue. The brief is designed for researchers and professionals working with computer communication networks and cognitive radio networks. Graduate students interested in networks and communication engineering will also find the brief helpful.