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《中国高新技术企业评价》2016,(17)
目前地铁已在城市中占据很大地位,然而地铁的主要通信信号传输问题一直存在。地铁建设或运营时,因其车-地的独特信号传输方式极易受到不同程度的信号干扰。文章对地铁信号的基本车-地无线传输系统中的信号受干扰问题展开了探讨,根据分析出的各干扰信号源进行研究,找出对应车-地无线信号传输的应对措施实用解决方案。 相似文献
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随着目前我国的铁路列车向高速化方向的迈进,为了保证有效的人机控制和提高运输效率,就必须要求我们建立健全功能完善的,技术构成先进的铁路通信网,本文就通过对相邻线、既有线通信设备和线路条件的分析,结合铁路通信传输系统的设置,以通信业务的需求的角度出发,从通信业务的需求、主要通信系统和容量的选择、电话交换系统、通信调度系统、无线通信系统、站间行车电话及其他专用通信系统、应急通信系统等方面,全面的阐述铁路通信传输系统的构成和实现的方法。 相似文献
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从地铁通信传输组网技术系统的定义、地铁通信传输组网技术系统应用的意义以及地铁通信传输组网技术系统主要技术比选这三个方面来进行阐述。 相似文献
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根据物流发展领域对物流运输监控的要求,综合无线传感器网络和无线通信技术的特点,提出了一种基于无线传感器网络与GPRS通信的物流运输车的远程监控系统。该系统适用性较高,在对物流运输车及货物的信息进行实时地采集和信息传送方面达到设计的要求,实现远程监控的功能。 相似文献
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地铁通信传输系统的方案设计与研究 总被引:1,自引:0,他引:1
地铁通信系统是整个地铁的中心环节,是保障地铁能够正常运行的基础。本文对于地铁通信传输系统的常见系统进行简要的分析,对如何选择最佳的通信传输系统方案进行研究。 相似文献
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根据物流发展领域对物流运输监控的要求,综合无线传感器网络和无线通信技术的特点,提出了一种基于无线传感器网络与GPRS通信的物流运输车的远程监控系统.该系统适用性较高,在对物流运输车及货物的信息进行实时地采集和信息传送方面达到设计的要求,实现远程监控的功能. 相似文献
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随着无线通信技术的发展,采用无线通信网不依赖于电网网架,且抗自然灾害能力较强,同时具有带宽大、传输距离远、非视非传输等优点,因此,无线通信技术已经在电力通信中广泛应用。 相似文献
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随着人类社会的发展与进步,人类对通信的依赖程度越来越高,无线通信以其不需铺设明线,使用便捷等特点,在现代通信领域占据重要地位.目前国内微机网络多为有线通信方式,有线通信的优点是数据传输可靠性较高,但需要铺设较多明线,而有些领域由于条件所限,难以铺设线路,这时就需要无线通信来解决问题.为此,本文介绍了单片无线收发一体芯片nRF401在无线传输中的应用. 相似文献
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Tim Power 《Revue internationale de statistique》2003,71(1):59-67
This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field. 相似文献
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field. 相似文献
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Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis
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Christopher Niedt Brett Christophers 《International journal of urban and regional research》2016,40(6):1094-1111
Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support. 相似文献
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Christian Busch 《Journal of Management Studies》2024,61(3):1110-1151
Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research. 相似文献
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Mohammad Mohabbat Khan 《Public Management Review》2013,15(2):267-278
NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders. 相似文献
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Chris Rowley John Benson Malcolm Warner 《International Journal of Human Resource Management》2013,24(4-5):917-933
There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion. 相似文献
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Based on a review of established U.S. management journals (1995–2003), six schools of thought are identified within the Anglo-American M&;A research: “Capital Market”, “Principal/Agent”, “Industrial Organization”, “Organizational Behavior”, “Human Resources” and “Strategic Management”. The literature review shows that the definition of M&;A success, the methods applied, and insights from empirical research differ according to the respective school of thought. Empirical studies focus on the resource combinations of merger partners, the specific circumstances of merger negotiations, and on integration management as antecedents of merger performance. Unfortunately, empirical findings have not yet provided reliable explanations for M&;A success. Based on the current state of Anglo-American M&;A research, the authors discuss implications for business practice, identify research gaps, and propose areas for future research. 相似文献
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John Pullinger 《Revue internationale de statistique》1997,65(3):291-308
A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context. 相似文献
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We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates. 相似文献
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物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。 相似文献
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大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。 相似文献