移动社会网络中基于全局信任模型的用户影响力计算

针对现有算法和模型对于网络中用户影响力计算大多只考虑拓扑结构和贪心算法而较少考虑真实社会网络中信任度对于节点影响力的重要性这一问题, 该文提出一种全局信任模型(global trust model, GTM)用于评估节点的影响力. 首先计算节点与邻居节点间的信任关系作为局部信任度, 其次利用Beta信誉模型在节点局部信...     

Mobile Social Net work--Research and Implementation of Mobile Twitter System

This paper researched and analyzedweb2.0 technology and mobile social network.Then researched and implemented the mobile twitter system.This paper introduces the function and modules of mobile client and PC server respectively.We also had the user experience and system test which are wrote in this paper.     

From Mobile Phone Sensing to Human Geo‐Social Behavior Understanding

The study of geo‐social behaviors has long been a scientific problem. In contrast to traditional social science, which suffers from the problems such as high data collection cost and imported user subjectivity, a new approach is presented to study social behaviors based on mobile phone sensing data. Different from other similar studies on mobile social sensing, three different types of geo‐social behaviors, including online interaction, offline interaction, and mobility patterns, are characterized based on a newly released Nokia mobile phone data set. We further discuss the impact factors to these behaviors as well as the correlation among them. The findings in this article are crucial for many different fields, ranging from urban planning, location‐based services, to social recommendation.     

移动通信网络语境下的社会网络分析

介绍了移动通信和移动互联网的发展及融合过程,给出了社会网络的变迁和传播的历程,最后分析了移动通信网络下社会网络的特征,提出移动通信网络和社会网络的融合为人类社会交往创造了更为广阔的发展空间。     

Behavior‐Based Propagation of Trust in Social Networks with Restricted and Anonymous Participation

Increasing interactions and engagements in social networks through monetary and material incentives is not always feasible. Some social networks, specifically those that are built on the basis of fairness, cannot incentivize members using tangible things and thus require an intangible way to do so. In such networks, a personalized recommender could provide an incentive for members to interact with other members in the community. Behavior‐based trust models that generally compute social trust values using the interactions of a member with other members in the community have proven to be good for this. These models, however, largely ignore the interactions of those members with whom a member has interacted, referred to as “friendship effects.” Results from social studies and behavioral science show that friends have a significant influence on the behavior of the members in the community. Following the famous Spanish proverb on friendship “Tell Me Your Friends and I Will Tell You Who You Are,” we extend our behavior‐based trust model by incorporating the “friendship effect” with the aim of improving the accuracy of the recommender system. In this article, we describe a trust propagation model based on associations that combines the behavior of both individual members and their friends. The propagation of trust in our model depends on three key factors: the density of interactions, the degree of separation, and the decay of friendship effect. We evaluate our model using a real data set and make observations on what happens in a social network with and without trust propagation to understand the expected impact of trust propagation on the ranking of the members in the recommended list. We present the model and the results of its evaluation. This work is in the context of moderated networks for which participation is by invitation only and in which members are anonymous and do not know each other outside the community. Copyright © 2014 John Wiley & Sons, Ltd.     

Investigating Modern‐Day Talaria: Mobile Phones and the Mobility‐Impaired in Singapore

Revisiting the medical and social models of disability, this study adopted the integrated biopsychosocial approach to examine experiences of 25 mobility‐impaired respondents in Singapore with using mobile phones. We found that mobile phones provided respondents a greater degree of mobility, a sense of control, and opportunities to escape the stigma of disability, thus challenging the boundaries between the able‐bodied and the disabled. Mobile phone appropriation allowed the management of personal identities and social networks, leading to a sense of empowerment. However, mobile phone usage might act as a double‐edged sword for disabled people, creating mobile dependencies and a spatial narrowing of social connections. Theoretical and practical implications are discussed.     

IT‐mediated social interactions and knowledge sharing: Role of competence‐based trust and background heterogeneity

In the knowledge‐based economy, organizational success is dependent on how effectively organizational employees share information. Many studies have investigated how different types of communication activities and communications media influence knowledge sharing. We contribute to this literature by examining increasingly prevalent yet understudied IT‐mediated social interactions and their effects on knowledge sharing among employees in comparison to face‐to‐face social connections. By integrating the literature on knowledge sharing, social networks, and information systems, we theorize the ability of IT‐mediated social interaction to (1) afford interactions between individuals with heterogeneous backgrounds and (2) facilitate frequent IT‐mediated social interactions that are high in competence‐based trust—both supporting effective sharing of knowledge. Through a social network analysis of the employees in a high‐tech organization, this study finds that IT‐mediated frequent social interactions are the most effective in promoting knowledge sharing.     

情景感知的P2P移动社交网络构造及发现算法

如何通过情景感知,获得用户的行为特征,从而自动发现潜在的社会关系,是移动社交网络重要的研究内容之一.该文提出了情景感知的移动P2P社交网络系统架构、聚合模型及发现算法,将用户的位置信息、环境特征、运动轨迹等引入到聚合算法中,智能地聚合成潜在的P2P社交网络,根据用户需求自主发现匹配的社会关系,避免了社交活动的盲目性和随意性.最后对该方案和算法进行了理论分析及实验验证,结果表明该文所提出的方案和算法具有较高的响应速度、准确率及用户满意度.     

Social context cognition crowd‐sourcing and semi‐automatic parametrization

This paper presents a semi‐automatic method of parameterizing an existing social context cognition model. It discusses benefits of the social context cognition models for example in personality modeling and their key issue that is parametrization. It briefly introduces social context cognition model and describes a new method of its crowd‐sourcing‐based parametrization. Later, validation is provided, and ability to recreate social context cognition in the provided samples is presented with good generalization for the unknown cases. Finally, model's stability for the continuous stream of dynamic social context input data is shown. Presented system contributes to the believable agent modeling and social simulations by making much needed applications of social context cognition models easier by addressing the so far unsolved troublesome parametrization issues. Copyright © 2016 John Wiley & Sons, Ltd.     

基于合作贡献的移动社会网络自私路由协议

移动社会网络的路由工作中存在一个不合理的假设,即所有节点是无私合作的,愿意为其他节点转发数据.然而,MSN网络节点通常表现出自私性,因为在现实世界中,节点通常被人们所支配,而社会中的人们可能由于节点资源的匮乏不愿意节点参与转发.这种节点的自私行为无疑极大地降低了网络的性能.为了解决移动社会网络的自私路由问题,提出了一种...     

Design of a Mobile Social Community Platform for Older Chinese People in Urban Areas

The increasing proportion of the older population and changes in the Chinese family structure make older Chinese people more vulnerable to social isolation than they previously were. This article illustrates the development of a mobile social application for older people in urban areas in China. The application facilitates the organization of leisure‐time activities between older people with similar interests living in adjacent areas. Preliminary social requirements of older people were collected through user interviews, and the major functions and features for the application were determined from the results of the interviews. Usability considerations for user interface design for older people were collected from literature and were integrated in the prototype of the mobile application. Older people's acceptance of the application was assessed by demonstrating the prototype to and interviewing 100 older people living in Beijing. The results highlight the critical impact of perceived benefits or relevancy on older people's adoption of new technology. Implications for the mobile social application for older Chinese people are discussed.     

面向社交物联网的移动端应用系统研究与实现

社交物联网是社交网络与物联网有机融合的新型网络,相应的社交物联网应用系统越来越得到人们的关注。社交物联网应用系统主流的架构是基于代理的模式连接物联网与社交网络,而有关社交网络直接应用物联网设备资源及其服务的模式仍有欠缺。物联网设备和服务资源如何作为社交网络的重要属性被社交网络发现、搜索和应用;用户、设备和服务资源如何通过社交网络进行共享等问题还有待解决。该研究面向社交物联网的基本应用,设计了一种将社交网络与物联网统一起来的应用系统。该系统以移动端应用程序开发平台作为开发工具,在应用程序开发框架内进行相关设计和开发,以社交网络应用、物联网设备管理、物联网设备的服务搜索等功能为主,解决了社交物联网中用户、设备和服务资源的统一共享问题。     

基于Android 平台与LBS 的移动社交系统的研究与设计

随着人们的生活水平的提高,人们的社交圈子和活动范围越来越广,人们对跨地域环境的不熟悉也造成了出 行和活动的不便。如何能随时随地了解当前位置信息和留下记录成为了人们关心的话题。针对这样的需求,本文设计了一个 基于Android 和LBS 技术的系统,重点介绍了该系统的需求分析、功能结构、系统设计及数据库设计。     

Observer‐based leaderless and leader‐following consensus for multiagent systems: A modified integral‐type event‐triggered design

This article aims to solve leaderless and leader‐following consensus problems for general linear systems by integral‐type event‐triggered control method. Different from the existing integral‐type event‐triggered controllers for multiagent systems (MASs), a modified distributed integral‐type event‐triggered scheme is designed via defining a measurement error without continuous communication. Then, distributed event‐triggered protocols are proposed for MASs to achieve the leaderless and leader‐following consensus. Moreover, for the case that all the agents' states are not available, distributed observers are given to estimate the full states. Meanwhile, leaderless and leader‐following consensus problems are investigated based on the observer‐based event‐triggered schemes. In addition, no agent will exhibit Zeno behavior. Finally, simulations are given to verify the effectiveness of our results.     

Social skills as predictors of communication,performance and quality of collaboration in project‐based learning

The assumption that social skills are necessary ingredients of collaborative learning is well established but rarely empirically tested. In addition, most theories on collaborative learning focus on social skills only at the personal level, while the social skill configurations within a learning group might be of equal importance. Using the integrative framework, this study investigates which social skills at the personal level and at the group level are predictive of task‐related e‐mail communication, satisfaction with performance and perceived quality of collaboration. Data collection took place in a technology‐enhanced long‐term project‐based learning setting for pre‐service teachers. For data collection, two questionnaires were used, one at the beginning and one at the end of the learning cycle which lasted 3 months. During the project phase, the e‐mail communication between group members was captured as well. The investigation of 60 project groups (N = 155 for the questionnaires; group size: two or three students) and 33 groups for the e‐mail communication (N = 83) revealed that personal social skills played only a minor role compared to group level configurations of social skills in predicting satisfaction with performance, perceived quality of collaboration and communication behaviour. Members from groups that showed a high and/or homogeneous configuration of specific social skills (e.g., cooperation/compromising, leadership) usually were more satisfied and saw their group as more efficient than members from groups with a low and/or heterogeneous configuration of skills.     

Creating user‐generated content for location‐based learning: an authoring framework

Two recent emerging trends are that of Web 2.0, where users actively create content and publish it on the Web, and also location awareness, where a digital device utilizes a person's physical location as the context to provide specific services and/or information. This paper examines how these two phenomena can be brought together so that user‐generated content on mobile devices is used to provide informal learning opportunities relevant to a person's location. However, the generative process of such media does not always have much guidance on how or what to create, so the quality of such information can be highly variable. To overcome this, a framework has been designed to guide the authoring of user‐generated content so that it can be used for informal learning about one's immediate surroundings (particularly in an outdoor setting), combining pedagogical aspects with those from human–computer interaction and environmental aesthetics. The framework consists of six dimensions that include aspects such as curriculum area (e.g. science, art), type of communication, use of language/media related to the landscape, knowledge level of content, contextual aspects, and types of interaction. In order to test the framework before it could be used to scaffold new content, it was first used to analyse and evaluate over 200 items of existing user‐generated content, to investigate the appropriateness of the proposed dimensions and the items contained therein or if any were missing. This paper presents the findings of this initial testing phase, together with a discussion of how the framework can be improved, in order to help scaffold the creation of new user‐generated content in the future.     

Mobile‐Based micro‐Learning and Assessment: Impact on learning performance and motivation of high school students

Mobile‐based micro‐learning has gained a lot of attention lately, especially for work‐based and corporate training. It combines features of mobile learning and micro‐learning to deliver small learning units and short‐term learning activities. The current study uses the lens of the Self‐Determination Theory of motivation and proposes a series of Mobile‐Based micro‐Learning and Assessment (MBmLA) homework activities to improve high school students' motivation and learning performance in science. An experiment was conducted to evaluate the effectiveness of the proposed approach. One hundred and eight students of a senior‐level high school in Europe were randomly assigned into either a control condition (conventional paper‐based homework approach) or an experimental (MBmLA approach) condition. The study carried out for a period of 5 weeks. From the experimental results, it was found that, in comparison to the conventional paper‐based approach, the proposed MBmLA approach enhanced students' basic psychological needs of self‐perceived autonomy, competence, and relatedness and improved students' exam performance in terms of factual knowledge. Moreover, students self‐reported greater learning satisfaction with the mobile‐based microassessment and micro‐learning homework tasks. Implications on educational practices as well as future research are discussed.     

Social Networking Sites: Their Users and Social Implications — A Longitudinal Study

The rapid adoption of social networking sites (SNSs) raises important questions about the social implications of such usage. Drawing on unique longitudinal data, surveying a representative sample of Norwegian online users (N = 2,000, age 15–75 years) in 3 annual waves (2008, 2009, and 2010), this study found a significantly higher score among SNS users in comparison to nonusers in 3 out of 4 social capital dimensions: face‐to‐face interactions, number of acquaintances, and bridging capital. However, SNS‐users, and in particular males, reported more loneliness than nonusers. Furthermore, cluster analyses identified 5 distinct types of SNS users: Sporadics, Lurkers, Socializers, Debaters, and Advanced. Results indicate that Socializers report higher levels of social capital compared to other user types.     

K‐MING: A mobile proxy handoff control scheme for proximate group‐based geodata sharing

This work adopts a mobile social network in proximity (MSNP)–centric group touring service concept to share geo–points of interest's (POIs') data among mobile users belonging to the same touring group. In a group‐based touring service, a mobile user can create a group in the MSNP that can consist of some clusters in which some members having the 3G/3.5G/4G cellular network service are selected as cluster leaders to enable their Wi‐Fi hot spot functions as mobile proxies. After that, each group member can join one of the clusters by connecting with a cluster leader's Wi‐Fi hot spot. Thereafter, each cluster leader downloads geo‐POIs' data using 3G/3.5G/4G cellular network and then shares the downloaded POIs' data with its cluster members through its Wi‐Fi hot spot. This work proposed a handoff mechanism such that each mobile user can handoff from its currently connected cluster to the other one that belongs to the same MNSP group. The main handoff concern is that each handheld device only allows a limited number of handheld devices to connect with its Wi‐Fi hot spot at the same time. This work proposed a K‐member‐limited MSNP‐based INter Group handoff scheme called K‐MING to tackle the handoff problem. The performance analysis shows that K‐MING for the group touring scenario has better performance for the sharing of geo‐POIs' data downloading in terms of average power consumption and average downloaded data volume from 3G/3.5G/4G cellular network than that of the individual touring scenario.