Zhe Wang

Recommender systems are ubiquitous in modern life and are one of the main monetization channels for Internet technology giants. This book helps graduate students, researchers and practitioners to get to grips with this cutting-edge field and build the thorough understanding and practical skills needed to progress in the area. It not only introduces the applications of deep learning and generative AI for recommendation models, but also focuses on the industry architecture of the recommender systems. The authors include a detailed discussion of the implementation solutions used by companies such as YouTube, Alibaba, Airbnb and Netflix, as well as the related machine learning framework including model serving, model training, feature storage and data stream processing.

This book gathers the thoughts of 8 hospital presidents, 9 vice presidents focusing on construction management in hospitals, and 6 hospital architects regarding the hospital design and construction in China. These experts are from top hospitals in Beijing, Shanghai, Zhenjiang, Gansu, Shangdong, Sichuang, and Neimenggu Province and have an average of 21 years of experience managing and developing hospitals in China. The book shares their thoughts on the soul of a hospital, the history and standards of Chinese healthcare systems, and the development of environments for healthcare in China.

This book is a study of the return migration of overseas Chinese students. By 2018, over 3.5 million Chinese students had returned from overseas universities to China, with the megacities of Beijing, Shanghai, and Shenzhen representing by far their main destinations. In other words, when overseas students return to China, many do not return to their hometown but usually land, work and settle down in Beijing, Shanghai and Shenzhen. Their return migration is thus not only transnational, but also internal-urban. This book adopts a multi-level geographical analysis to explore this important phenomenon, exploring why and how returnees choose these three cities and how they experience and interpret their everyday lives in these megacities after their return. In doing so, it highlights the importance of cultural logics and multiscalar thinking of transnational Chinese students’ return migration and illuminates how their transnational migration reproduces domestic socio-spatial inequalities. This book brings an important contribution to the fields of Cultural Geography, Urban Geography, Transnationalism, Migration Studies and Citizenship Studies.

70年代初，中国处于物质、精神都很困乏的时期，方、顾两个普通邻家发挥了人性大爱，共同养大一个被遗弃的女婴。方叶子的命是捡来的，人生本该平淡无奇，而爱神的箭偏偏射中了她。梦一般的异国婚姻把她带到纽约，却在繁华中搁浅。离婚后她所面临的挑战是如何维生？不久，她发现自己怀孕了。身在异国他乡，她一个人挑起生活的重担；养儿子、赚钱、作生意。不料，一场牢狱之灾又从天而降...... 

This Springer Brief investigates spectrum sharing with limited channel feedback in various cognitive radio systems, such as point-to-point, broadcast scheduling and ad-hoc networks. The design aim is to optimally allocate the secondary resources to improve the throughput of secondary users while maintaining a certain quality of service for primary users. The analytical results of optimal resource allocation are derived via optimization theory and are verified by the numerical results. The results demonstrate the secondary performance is significantly improved by limited feedback and is further improved by more feedback bits, more secondary receivers and more primary side information.