What is the magnitude of fixed–mobile call substitution? Empirical evidence from 16 European countries

This paper investigates the degree of fixed–mobile call substitution (FMCS) within different European countries. We use quarterly data from 2004 to mid-2010 on 16 mainly Western European countries. By applying dynamic panel data techniques, we are able to estimate short- and long-run elasticities of the telecommunication usage prices on the fixed-line call demand. The own-price and cross-price elasticities found give strong empirical evidence for substitutional effects towards mobile services. In particular, the estimated cross-price elasticities of the mobile price on the fixed-line call demand are relatively large compared to other studies.     

便携式终端天线的分集设计

介绍了天线分集中便携式无线终端设备中天线分集系统的构成、分集天线单元的常用形式、特点、分析方法和设计以及分集信号的最终合成。     

不完美碰撞检测的CSMA/CA协议性能分析

传统中低轨小卫星群的移动自组织网络中，卫星采用半双工载波侦听/碰撞规避协议（Carrier Sensing Multi-access/Collision Avoidance,CSMA/CA）接入控制信道。为避免半双工模式“盲听”对碰撞感知存在的延时，提升接入效率，卫星需要工作在碰撞检测和数据接收同步进行的全双工模式；同时由于卫星通信特点，残余自干扰带来的不完美碰撞检测不可忽略。针对以上需求，设计了一种全双工CSMA/CA协议，对接入流程和参数进行了详细描述；研究了自干扰抑制度和检测门限等与虚警率、漏检率的数学关系；推导了系统吞吐量的解析表达式，并仿真探究了初始竞争窗口长度等参数的优化设计准则。仿真结果表明，通过合理选取参数，该协议能在存有不完美碰撞检测的情况下，实现吞吐量的提升。     

一种基于无线携能通信的MEC与用户匹配算法

多接入边缘计算（Multi-access Edge Computing,MEC）和无线携能通信可有效提高用户的服务质量和体验。在计算、通信和能量等资源的约束条件下，用户匹配是优化MEC任务卸载时系统效用的重要方法。针对无线携能通信的MEC网络结构，综合考虑用户的需求差异性和多元化能量供给，建立了基于计算资源、传输资源和能量资源的系统效用函数；以系统效用最大化为目标，采用基于多维背包理论的多轮拍卖，提出了一种适用于多用户和多网络边缘服务器的用户匹配算法。仿真验证了所提用户匹配算法的有效性与可靠性，结果表明所提匹配算法可优化系统资源配置，有效提高整体性能。     

Effects of game‐product congruity on in‐app interstitial advertising and the moderation of media‐context factors

Advertising has become one of the major sources of game apps revenues and interstitial ads, in particular, are the most used monetization method among the types of in‐game mobile ad formats. Interstitial ads overlaid on top of a mobile game app have more obvious advertising intent and a higher degree of forced exposure and perceived intrusiveness. This study examined how the degree of congruity (high vs. moderate vs. low) between the promoted products in interstitial ads and the mobile game app environment affects consumers’ responses. The moderating effects of media‐context factors (i.e., excited– or calm–happiness game types and game immersion) were further assessed. The results of two experiments revealed that game‐product congruity lead to better consumers’ responses toward ads and advertised products. The positive effects of game‐product congruity were more salient when consumers played calm–happiness games and were less immersed in the game. Theoretical implications on integrating perspectives across disciplines such as schema theory, happiness, and immersion within the media‐context framework, as well as practical suggestions are discussed.     

The interaction effect of mobile phone screen and product orientation on perceived product size

Perceived product size is a key concern in online retail, particularly in fashion and grocery. The screen on which consumers view a product (e.g., desktop or mobile) might constitute a frame that biases size perception, on the basis of assimilation and contrast effects (pool and store theory). The rise of mobile commerce exacerbates this issue, as framing effects might be stronger versus desktop settings as screens are smaller. Further, as mobile phone's screen orientation varies situationally (vertical vs. horizontal), the perceived product size might vary, depending on the interaction of screen and product orientation. By introducing the framing ratio as a means to predict extent, dimensionality and symmetry of size biases, we generalize specific findings from extant research. Empirically, four experimental studies demonstrate that contextual frames (i.e., vertical vs. horizontal screens) and product orientation (e.g., jeans vs. shoes) interact to bias the size perception, in that sizes are overestimated on the dimension that approaches the frame (high framing ratio), compared with conditions where the frame is distant (low framing ratio). If product size is misperceived, willingness to pay might be affected (e.g., for groceries). Thus, size perceptions have a direct impact on managerially relevant variables.     

How smartphones enhance local tourism experiences?

This study investigates the application of smartphones in providing local tourism experiences in Isfahan, Iran. A self-administrated questionnaire, employing the theory of planned behavior was developed, and distributed among international tourists visiting Isfahan. The results showed that tourists’ attitude towards smartphones positively influences the intention to participate in local tourism experiences. Findings confirmed that tourists’ perceived behavioral control has a positive and direct influence on their travel intention, while surprisingly no association was found between tourists’ beliefs, subjective norms, and travel intention. Findings also revealed that tourists’ beliefs and subjective norms have a positive and direct influence on participation in local tourism experiences.     

The EMF uncertainty problem related to mobile phones: where do consumers place their trust?

This paper addresses the uncertainty problem, i.e. cases characterized by lack of knowledge or scientific uncertainty. In such situations, it can be hard for consumers to ‘voice’ or practise consumer power. One field characterized by the uncertainty problem is electromagnetic radiation. An explicit goal of this study has been to articulate Norwegian consumers' practices, attitudes and beliefs regarding electromagnetic radiation from mobile phones to public authorities and consumer policy makers. The study was based on 1000 telephone interviews collected in 2008. Today, experts disagree on the potential health effects of radiation from electromagnetic fields (EMF), as well as standards for safe limits of exposure to mobile phones, base stations and wireless telecommunication systems. In addition, complicated technology and extremely rapid product development and diffusion leave consumers' security considerations to their own beliefs and trust. Whether or not electromagnetic radiation from mobile phones constitutes a health hazard will not be addressed in this paper. Rather, it will focus on how consumers react to this situation of uncertainty. The material reveals four main ways in which consumers can solve what we have named the EMF uncertainty problem: the confident and comfortable way, the sceptical and cautious way, the responsible and good citizen way, and finally, the neglecting way. The paper also discusses the precautionary principle related to EMF. Who should be precautionary: the public authorities, the mobile phone industry or the consumers themselves? We believe that a consistent governmental precautionary policy in combination with consumers taking their own precautionary measures is a viable solution. In this way, all consumers would be addressed and aided when navigating this field of uncertainty.     

高龄人群移动信息终端产品设计研究

目前我国的消费市场上针对高龄人群所设计开发的移动信息终端产品非常少,这方面研究也极其有限。通过资料分析以及市场调查等手段对高龄人群的生理和心理两大方面进行研究,其中生理方面包括听力、视力、触觉和肌力,心理方面包括消费心理和认知心理。根据研究结果,分析归纳得出高龄人群移动信息终端产品设计的指导性设计原则。最后,以面向高龄人群的移动信息终端产品设计为实例,验证上述设计原则。     

Time‐use and well‐being impacts of travel‐to‐work and travel‐for‐work

This article contributes to our understanding of the complex patterns of travel‐to‐work and travel‐for‐work which increasingly characterise highly skilled employment, using 2015 data from a UK Midlands study comprising an online survey and follow‐up interviews. Travel‐to‐work essentially lengthens the working day, and is difficult to use productively, especially when commuting by car. Travel‐for‐work, by contrast, results in intense schedules especially when requiring overnight stays. Ownership of travel‐for‐work is ambiguous: it is employer driven, and travel time is often spent productively using mobile technologies, but is rarely rewarded with TOIL. While general dissatisfaction is reported with the commute, negative effects of travel‐for‐work (family, health, reduced leisure time) are mediated by positive impacts including experience of new working cultures, and infrequency of travel. Four factors appear central to the differing well‐being impacts: (1) frequency of travel; (2) ability to plan travel; (3) productive use of travel time, and; (4) reciprocal benefits of travel.