低轨卫星移动通信系统馈电链路切换方案

研究了无星际链路低轨卫星移动通信系统中的馈电链路的切换问题,提出了两种馈电切换方案-最短馈电链路切换方案和最长可视时间切换方案。结合两种已有的用户链路切换准则,在构造的非均匀分布全国话务密度模型上进行了系统仿真。仿真结果表明馈电链路切换方案对系统开销影响较大,选择最长可视时间馈电链路切换方案,可以减少切换带来的信令开销,提高服务质量,具有较高的参考和实用价值。     

移动学习模式探讨及系统架构设计

移动学习应用环境日趋成熟。在此背景下,本文就移动学习的定义与范畴、移动学习的特征进行了探讨;提出了移动学习的两类模式;在此基础上对移动学习系统的架构进行了设计,为移动学习模式在教育教学中的进一步应用奠定了基础。     

我国手机回收逆向物流模式研究

我国废旧手机逐年增长,通过逆向物流管理可以回收资源,保护环境,净化手机流通渠道,提高顾客满意度。发达国家通过＂生产商延伸责任制＂使废旧手机通过生产商、生产商委托运营商回收方式或是第三方回收公司从消费者逆向返回生产商/供应商。通过借鉴国外成功的回收模式经验,建立我国手机联合回收模式,可充分发挥各主体的职责。     

Permanently online and permanently connected: Taiwanese university students’ attachment style,mobile phone usage,and well-being

Taiwan has been the top country worldwide in terms of its adoption and use of mobile phones. This study explores the permanently online (PO) and permanently connected (PC) phenomenon in mobile phone use among Taiwanese university students. It seeks to determine whether attachment styles are a distinctive factor that influences PO and PC (POPC) behavior and leads to various levels of well-being. The results of this study provide initial evidence that Taiwanese users highly depend on their mobile phones for PC and PO activities but perceive that being permanently connected causes interpersonal stress. Although the findings showed that all styles were positively associated with PO, only the secure and anxious styles predicted PC. Regarding mobile phone activities, the avoidant attachment style was not associated with any activities, the secure attachment style was positively associated with online and voice communication as well as information-seeking activities, and the anxious attachment style was associated only with voice communication. Furthermore, attachment styles lead to various levels of interpersonal stress through PO and PC behavior. The anxious style interacts with PO on interpersonal stress. This study provides evidence that attachment style is a significant antecedent of POPC and its consequences in mobile phone usage.     

Distributed intervention: networked content moderation in anonymous mobile spaces

Given recent public focus on the use of digital tools to engage in discrimination and harassment, online platforms have come under increasing scrutiny to address online incivility. Many of these efforts have been critiqued for relying too heavily on technical tools or burdening individuals with the responsibility for reporting inappropriate actions. This research examines practices of digital bystander intervention on the anonymous localized mobile app Yik Yak. Through an analysis of the firsthand experiences of college students in the United States, this research identifies and investigates practices of networked intervention—that is, strategies of content moderation where success relies on collective action. Rooted in a general uncertainty and skepticism regarding reporting tools provided by the platform, findings suggest a preference for intervention practices that depend on distributed responsibility and networked activity. Taking inspiration from research on college bathroom graffiti—a parallel discursive environment—this paper employs the feminist theory of relational autonomy to explore the possibilities and limitations of networked intervention to cultivate individual and collective empowerment.     

Blood,Sweat, and Tears: Navigating Creepy versus Cool in Wearable Biotech

ABSTRACT

This paper considers how personal data protections figure into the design process of wearable technology. The data question is becoming especially important in the face of recent innovations in biotechnology that capitalize on the new fungibility of biology and electronics, in which new biotech wearables capitalize on the ability to analyze and track changes in blood, sweat, and tears. Interviews and participant observation with wearable tech designers, data scientists, fashion tech entrepreneurs, and select experts in cybersecurity and intellectual property law, reveal a range of approaches to data protection in design within the culture where wearables are beginning to merge with biotech. While a few respondents were extremely vigilant about protecting consumer’s privacy, the majority felt that when consumers ‘opt in’ to data sharing, they should be cognizant of the risks. From their perspective, it is not necessarily the producer’s responsibility to protect user's personal data. These attitudes present a problematic logic, which leaves users vulnerable to data exploitation. The paper concludes by arguing that this laissez-faire culture is the environment in which wearable biotech is being developed and will be deployed. This emerging technology raises issues about bodies, data, and ownership in crucial need of analysis and critique to push its move into the mainstream toward more equitable and inclusive ends.     

There is an app for that? The impact of community knowledge workers in Uganda

Rapidly expanding mobile network coverage in developing countries offers new ways to reach poor farmers in isolated places. This article explores the potential for Information and Communication Technology to provide agricultural information and extension services to smallholder farmers, and links this to empirical insights of an intervention in Uganda, where community knowledge workers rely on mobile devices to deliver context- and time-sensitive data to farmers. Consistent with theoretical insights related to information inefficiencies, we find that the intervention leads farmers to move away from low-risk low-return crops toward more commercially oriented commodities. Our analysis also suggests that, for the case of maize, the intervention causes farmers to sell less on the market, but at significantly higher prices.     

Usability and Feasibility Study of a Remote Cognitive Behavioral Therapy System with Long-Term Unemployed Women

We present the results of the use of a cognitive behavioral therapeutic intervention tool to improve the mental, physical, and social health of a group of long-term unemployed women in Spain. Method: We sent automated text messages (SMS) to the mobile phones of long-term unemployed women selected at random from public social services. During a 28-day intervention period, women received four daily automated text messages on her mobile phone on a predetermined hourly schedule. We measured depression symptoms at the start and end of the intervention and we analyzed qualitative data to determine the acceptability of a remote SMS program. Results: Depression symptoms using the Personal Health Questionnaire-9 (PHQ-9), went from an average of 13.8 at baseline to 4.9 at the end of 28 days (p?=?0.89). One hundred percent of the women reported that they liked receiving the text messages and most found them helpful.     

The ‘digital glimpse’ as imagining home

This paper proposes the concept of the ‘digital glimpse’, which develops the existing framing of imaginative travel. Here it articulates the experiences of mobile workers digitally connecting into family life and everyday rituals when physically absent with work. The recent embedding of digital communication technologies into personal relationships and family life is reconfiguring how absence is experienced and practiced by workers on the move, and through this, new digital paradigms for life on-the-move are emerging. This paper explores how such social relationships are maintained at-a-distance through digital technology – using evidence from qualitative interviews with mobile workers and their families. Digital technology now enables expressive forms of ‘virtual travel’, including video calling, picture sharing, and instant messaging. This has implications for the ways in which families can manage the social and relational pressures of being apart. Experiences of imaginative travel created through novel media can enrich the experience and give a greater sense of connection for both those who are at home and those who are away. While technology is limited in its ability to replicate a sense of co-presence, ‘digital glimpses’ are an emergent set of sociotechnical practices that can reduce the negative impact of absence on family relationships.     

The middling mobile: finding place in the liquid city

The middling mobile, differentiated by their modest and unsure mobility, are a vast of bulk of people who intend or expect to move on. As they travel, they tread differing intensities of rhythm and social embeddedness felt to be chaotic, constraining, liberating, or comforting. Owing to their aspirations to ‘get out’ of a rhythmic life, or to move somewhere familiar, the middling mobile use movement and rootedness to navigate and manage everyday life in the liquid city. My analysis offers a holistic exposition of a life that flows between mobility/immobility and rhythmic/arrhythmic forms, and the transitions between them.