首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   243篇
  免费   0篇
财政金融   4篇
工业经济   156篇
计划管理   10篇
经济学   49篇
贸易经济   15篇
农业经济   1篇
经济概况   8篇
  2022年   5篇
  2021年   3篇
  2020年   9篇
  2019年   8篇
  2018年   3篇
  2017年   8篇
  2015年   1篇
  2014年   11篇
  2013年   23篇
  2012年   16篇
  2011年   14篇
  2010年   15篇
  2009年   6篇
  2008年   14篇
  2007年   13篇
  2006年   9篇
  2005年   4篇
  2004年   7篇
  2003年   2篇
  2002年   10篇
  2001年   3篇
  2000年   7篇
  1999年   2篇
  1998年   1篇
  1997年   3篇
  1996年   1篇
  1994年   1篇
  1993年   1篇
  1985年   10篇
  1984年   12篇
  1983年   12篇
  1982年   9篇
排序方式: 共有243条查询结果,搜索用时 15 毫秒
31.
Competition in the long-distance market in the US continues to intensify; the 1996 Telecommunications Act has led to increased competition in long-distance telephony especially as the Regional Bell Operating Companies have begun to gain entry to long-haul, long-distance markets. In order to better understand the implications of having increased service offerings, models of how customers choose between carriers (and the impact of this choice on subsequent usage) will be useful. We develop the first publicly available models that simultaneously estimate choice and usage for intraLATA long-distance in the US. Utilizing a generalized Tobit model, the price responsiveness of usage and carrier choice are estimated. The results are generally consistent with expectations both in terms of theory and of practical experience in the industry.  相似文献   
32.
Infrastructures of surveillance—everyday, taken-for-granted, institutionalized and technically mediated practices which identify, observe, and analyze individual actions—permeate society. These infrastructures mediate the production of social knowledge and action toward individuals. This article examines the genesis of one such infrastructure, namely the coordinated practices of identifying and locating mobile phone users during emergency (9-1-1) calls. Implementing this infrastructure has entailed creating and coordinating systems to locate wireless phones, to deliver the emergency calls to the appropriate service agency, and to deliver appropriate services to the emergency event. This implementation has occurred within historically specific regulatory, political, cultural, technological, and economic contexts and has specific implications for general surveillance practice. Focusing primarily on the state of Texas, this article examines the development of systems which store and deliver individuals’ geographic location. It argues that, despite privacy laws tightly restricting the use of information generated in the 9-1-1 process, and despite the special purpose to which the 9-1-1 system is dedicated, the wireless 9-1-1 initiative has created the infrastructure for a general purpose locational surveillance infrastructure capable both of surveilling broad patterns of activities and of responding to particular individuals. Moreover, the infrastructure is more available to police agencies and to well-established and well-funded corporate entities than to grass roots organizations. This trend is driven by the need to coordinate a national emergency response system within a fractured telecommunication industry, by the desire of marketers to understand and address their customers’ habits of mobility, and by an increasing willingness of police agencies to include widespread surveillance under the rubric of “emergency services.” Policy responses such as greater ability to opt out of the surveillance system, public oversight of emergency operations, and greater public access to the infrastructure itself might mitigate the most harmful potential social effects of this infrastructure, while distributing its benefits in a more democratic and egalitarian way.  相似文献   
33.
Public activity in the telecommunications industry has experienced important transformations in the last decade: “reinvolvement” in infrastructure deployment, “innovative” boosting measures, and decentralisation of some decisions. Conceptually, even more important than the measures themselves is the fact that private agents often participate in their realisation and execution. This paper reviews how justifications for public action that would apply to any economic activity area have modelled the public-private relationship in the telecommunications sector. Subsequently, it focuses on the analysis of the new spaces for public-private collaboration that are currently opening up.  相似文献   
34.
The Telecommunications Act of 1996 (1996 Act) established the framework for four federal universal service programs: the High-Cost program, the Low-Income program, the Schools and Libraries (E-rate) program, and the Rural Health Care program. During the past 15 years, these programs have been examined from a number of perspectives in an attempt to measure their efficiency and effectiveness, including the funding mechanisms that support them. The Federal Communications Commission is in the process of restructuring the universal service programs to move support to broadband-based technologies. This is an opportune time to examine what is known about whether these programs have met the universal service objectives of the 1996 Act and have efficiently and effectively used universal service funding. To that end, this article surveys both oversight reports by federal government agencies and academic research literature drawn from a variety of sources to identify areas of concern regarding the mission, implementation, and impact of the federal universal service programs and support mechanisms. The article also includes research findings on how the economic incentives created by the federal universal service programs affect corporate investment and deployment decisions and consumer service and technology adoption decisions.  相似文献   
35.
The second–generation (GSM) spectrum auction in Germany is probably the most clear cut example of a low price outcome in a simultaneous ascending-bid multi-unit auction. The present paper gives an account of the events, describes the auction rules and market conditions, and provides a game theoretic explanation of low price equilibrium in simultaneous, ascending-bid multi-unit auctions. In particular, it is shown that in the unique equilibrium that survives iterated elimination of dominated strategies, the efficient allocation is reached at minimum bids.  相似文献   
36.
With telecommunications technology and patterns of use changing ever more rapidly, formal multilateral Administrative Conferences on radiocommunication are becoming more unmanageable and the results less satisfactory. This article contrasts the formulation of the ITU's radio arrangements with the Consultative Committee process for telecommunication arrangements. The author argues that the time has come to deformalize the radio arrangements. Improvements in flexibility, knowledge level and cost benefits would greatly outweigh any liabilities, and would enhance international cooperation.  相似文献   
37.
The demand for Toll Free Numbers (TFNs) languished from 2000 to 2008; however recent growth in demand caused the FCC to open a new toll-free code (855) with the possibility of new code openings in the next three years. The analysis here indicates the demand for TFNs is highly inelastic (the coefficient for own price elasticity for TFNs is approximately −0.04). This has implications for concerns regarding future exhaust of toll-free codes and the price structure for recovery of SMS/800's costs. This article considers the effects of the limited property rights for TFN, and welfare implications of gray markets for vanity TFNs. The FCC's allocation mechanism for new 855 codes is considered and whether other allocation mechanisms, such as auctions, could be welfare superior.  相似文献   
38.
39.
This paper charts the development of telecommunications in Bhutan. Since the introduction of telecommunications services in 1963 Bhutan has faced many challenges as it has sought to roll out a network that covers the whole population and country. A small population, a mountainous geography, a transitional economy and a unique approach to development—Gross National Happiness—present many challenges that need to be overcome if the telecommunications industry is to develop further. Added to this is the decision of Bhutan to join the outside world through membership of the ITU, APT and WTO that has added liberalisation and privatisation to the challenges faced by Bhutan. This paper identifies two broad policy options that Bhutan could adopt—network expansion nationally or investment concentration towards urban areas. The authors conclude that due to the limited resources available to Bhutan these policies are contradictory and will take the telecommunications industry in quite different directions if adopted.  相似文献   
40.
Judging by historical and crossnational experience, privatization of British Telecom promises to increase the rate of expansion of telecommunications usage, but also to redistribute services and charges. Public dissatisfaction with these reallocations could recreate the political discord that stunted the early growth of the British telecommunications manufacturing sector, unless the new technology and regulatory institutions substantially alter the economic environment. More intense competition. rather than prospective changes of network ownership, seem to have improved the seem to have improved the manufacturing industry's performance in recent years.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号