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Features
Mobile Social Networks
Guest Editors: Xie Xing and Yu Zhiwen
Ephemeral Social Network: From Online to Mobile
Liu Zhen, Qin Yongjian, Wang Xia and Xu Bin
Dr. Liu et al. from Nokia Research Center (Beijing) propose the concept of ephemeral social network (ESN), which supports ways to offer users the integrated social experiences, and discuss the challenges and the research issues related to ESN.
Aware Comuting Model, Platform and Practice in Mobile Social Networks 
Yu Zhiwen, Zhou Xingshe and Guo Bin
Prof. Yu et al. from the Northwestern Polytechnical University describe the essential features of mobile social networks (MSN) from the perspective of context-aware computing. By identifying MSN’s major characteristics and its difference from traditional social networks, they propose the context-aware model of MSN and present a generic infrastructure for it. Two applications, the smart campus and the social-aided medical intake, are also described to illustrate their vision on MSN.
User Behavior Prediction Model in Mobile Social Networks
Tang Jie and Yang Yang
Peoples’ behaviors in the social networks directly reflect their feelings and activities in the real world. Dr. Tang et al. from Tsinghua University propose a time-varying factor graph model to formalize users’ dynamic activities. The model considers both network structure and users’ context information. They also validate the proposed model on various social networks.
Mobile Social Networks and User Location
Xie Xing and Lian Defu
Understanding user location is an important research problem in mobile social networking services. Dr. Xie et al. from Microsoft Research Asia and the University of Science and Technology of China describe a novel location naming approach, which can provide concrete and meaningful location names to users based on the information of their current location, time and check-in records. They propose a local search framework to integrate different kinds of popularity factors and personal preferences, and discuss the challenges in predicting locations where a user may check in next.
Location Trace Analysis for Smart Cities
Pan Gang, Li Shijian, Qi Guande and Zhang Wangsheng
Trace analysis is becoming a hot topic in the development of smart cities and social networks. Prof. Pan et al. from Zhejiang University summarize the data types, research challenges, and potential applications related to trace analysis. They also introduce their recent work on analysis of large-scale real taxi GPS traces.
Mining Spatio-temporal Trajectory Patterns from Social Media
Peng Wenzhi
Nowadays, people can share their daily or travel information of movement by location-based services (LBSs). Several research issues, such as trajectory mining, mobile data management, and trajectory search, also arise from the huge volume of user-generated data. These user-generated social media reveal users’ implicit travel or driving experiences. Dr. Peng from National Chiao Tung University in Taiwan, China introduces their works, which include several different frameworks for travel and driving applications.
 

Columns
Issues on Recommended Postgraduates
Yang Yixian
Typically the students, who enter the graduate school by recommendation without entrance examination, are thought to be better qualified. But Prof. Yang from Beijing University of Posts and Telecommunications, a veteran graduate school teacher, raises some serious issues existing in this group.
The Best Rule of System Design: Keep It Simple and Stupid
Bao Yungang
Dr. Bao from the Institute of Computing Technology, CAS, summarizes the viewpoints of some influential articles, and combined with his own experiences, presents his understanding of the system design rule -- “Keep It Simple and Stupid!”.
Runtime System: Challenges in Multi/Many-Cores Era
Liao Xiaofei, Zhang Weihua, Jin Hai and Ye Chencheng
Runtime system is one of the basic components of system software stack. It is the key to ensure the computer applications run safely and efficiently. The challenges in multi/many-core era faced by runtime system are mainly performance and management. Based on the 863 Key Project New Kind of Multi/Many-Cores Processor Programming and Runtime Support Environment, Dr. Liao et al. from Huazhong University of Science & Techno-logy, introduce their relevant works.
Natural and Harmonious Human Computer Interaction
Meng Xiangxu
In order to build a natural and harmonious environment of human computer interaction, researchers do a lot of attempts and make some progresses. Prof. Meng, from Shandong University introduces the recent progresses of Human Computer Interaction from three aspects including context-awareness, user-ability-based design and brain–machine interface with some interesting cases.
Psycho-physiological Computing: A New Intercross Subject-based Computing Model
Hu Bin, Zhang Jianyuan and Yao Zhijun
Psycho-physiological computing, which has been deeply involved in investigating inherent co-relationship between psychological phenomena and physiological features, is a promoting computing model based on psychophysiology combined with advanced developments in computer science, mathematics and physics. Prof. Hu et al. from Lanzhou University introduce the relevant information about its research significance, related technologies and recent works, as well as its potential applications and future possible development.
JavaScript Will Likely Be a Dominant Programming Language
Liu Zhenxing
With the development of mobile Internet and HTML5, JavaScript as a client-side and light-weight programming language has been reviewed again. Mr. Liu, a network researcher from the Institute of People’s Daily Online, introduces an interview of JavaScript’s founder from IEEE Computer and presents some exciting examples of application based on JavaScript and HTML5, including a server-side JavaScript project NodeJS.

Advances
Profiles  Prof. Robert Tarjan – the Receipt of ACM Turing Award
Wang Min and Luo Ping
Conferences  IEEE VisWeek 2011
Yuan Xiaoru

Translations
Tabletops: Interactive Horizontal Displays for Ubiquitous Computing
Christian M¨¹ller-Tomfelde and Morten Fjeld (translated by Guo Minyi)