IP电话系统中SNMP代理的实现

结合对简单网络管理协议（SNMP）的研究，分析了Agent 网管代理开发包，并介绍了利用Agnet 实现IP电话系统中SNMP代理的过程。     

The Measurement of Consumption Efficiency Considering the Discrete Choice of Consumers

In this study we propose a mathematical definition of the consumption efficiency of multi-attribute products in the price–quality space. A new model, the discrete Range Adjusted Measure (RAM) model, is suggested as an empirical tool to measure the level of consumption efficiency. We further discuss the effect of consumption efficiency on the innovation incentive. Empirical work is made for the mobile phone market. We expect that the consumption efficiency concept will contribute to the extension of the traditional framework of production efficiency analysis on the one hand and to the understanding of the nature of innovation in a technology-intensive market on the other hand.JEL Classification: C67, D11, D12, D21     

智能车辆流量检测器的设计与实现

本文介绍了利用单片机如何实现智能环形线圈车辆检测器，讨论了此类检测器的软硬件设计要点。给出了相应的接口电路。     

电话录音与自动拨号报警系统的设计

介绍了一种以89C51单片机为控制器的电话录音与自动报警系统，该系统兼有录音电话和利用电话自动拨号报警的功能，给出了硬件框图和主程序流程图，该系统特别适用于家庭和办公室。     

单片开关电源的原理及应用

TOPSwitch系列三端单片开关电源集成电路是由控制电压源、带隙基准电压源、振荡器、脉宽调制器等部分组成的。其工作原理是利用反馈电流来调节占空比达到稳压目的。在光电反馈式开关电源中由于增加了光电反馈电路 ,使输出电压的精度与调整率均得到明显提高。 TOP1 0 0系列还能构成固定频率、非连续式功率因数校正升压预调节器 ,可用于提高功率因数、降低无功功率、减少谐波及防止输出波形失真等作用。     

中国电信套餐选择策略研究与评析

对中国电信的乐享3G上网版套餐,利用聚类分析法对其10种套餐重新分类,以适应消费者心理及需求。同时利用层次分析法将中国电信和移动运营商针对某一消费群体制定的套餐进行对比分析,找出其不足并给出合理性建议。     

The significance of digital data systems for smart city policy

Our planet is gradually moving towards an urbanized world. Modern urban agglomerations tend to turn nowadays into advanced information hubs supporting a smart management of dynamic urban systems. The currently popular notion of ‘smart cities’ aims to provide a new perspective for sustainable and high-performance strategies of city stakeholders in our ‘urban century’. In this context, digital information technology provides a new tool for efficient and effective management and planning of urban space, inter alia in the field of transportation, environment, public facilities or advanced service provision to citizens. This paper aims to offer, first, a concise overview of the emerging opportunities of information and communication technology (ICT) for smart urban policy; digital technology in particular, appears to provide novel pathways for modern planning strategies in smart cities. Against this background, the paper sketches out the complex force field of global urbanisation phenomena and highlights the data and information needs for strategic planning of cities (using inter alia as a framework the so-called ‘urban piazza’ strategy framework). Secondly, various new decision support tools that are currently emerging and that offer a new promising scope for handling complex urban management issues (for instance, on accessibility, congestion, safety or sustainability) are briefly presented. And finally, the potential of such digital data systems for urban management and policy is concisely illustrated by means of some recent applications in the area of smartphone data systems. The paper concludes with a discussion of the challenges ahead for urban policy, inter alia by paying attention to institutional and governance aspects of ‘big digital data’ management in urban systems.     

The effects of distributive,procedural, and interactional justice on customer retention: An empirical investigation in the mobile telecom industry in Tunisia

The framework offered in this study provides empirical evidence concerning the interaction between distributive, procedural and interactional perceived justice and loyalty program satisfaction on relational satisfaction in the mobile telecommunication context. Firms that rely on justice perception for strategy implementation are able to attain customer retention. This study suggests a theoretical model of customer retention that aims at investigating the role of satisfaction with loyalty program on relationship marketing. The structural equation modeling was used to test the hypothetical relationships. A self-administrated questionnaire was distributed to a total of a convenience sample of 520 customers of multiple mobile phone companies. The target population includes customers who have subscribed to a loyalty program. Results show that distributive justice moderates the relationship between satisfaction with the loyalty program and relational satisfaction. The results highlight the need to focus on distributive justice in order to nurture satisfaction and loyalty. Satisfaction with the loyalty program is a key predictor of a satisfactory relationship with the operator and customer retention.     

自动干手器设计

自动干手器的电动机自动运转的电路组芯片往往比较多,管脚与管脚之间的焊接常常会出现虚焊和脱焊现象,从而造成电路无法实现其功能。文章主要介绍了用单片机设计控制电动机自动运转的电路组成、设计原理、设计思路及其功能。