基于V5的用户接入系统ISDN接入模块的设计与实现

介绍Ｖ５接入网用户接入系统的ＩＳＤＮ接入模块硬件和软件设计方案。这个方案具有系统配置灵活的特点。另外，此方案主要采用西门子公司的芯片组。     

V5接口的测试方法

本文道德简要介绍了Ｖ５接口的基本发展情况，以及各种测试方法和测试类型。然后详细论述了Ｖ５接口协议的一致性测试，并以检测ＨＶ５ＰＣ系统为例，深入讨论这种测试方法的原理。     

VOD视频点播系统

在信息技术狂飙猛进的今天,大多数网民已经满足于文字与图片的浏览,音频和视频的在线欣赏势在必行。流媒体技术的应用使得在线欣赏视频得以实现。本点播系统利用VBScript语言在ASP环境下,以Access做后台数据库实现了用户和后台管理两个应用。在本系统中用户可以进行注册,然后点播自己想看的电影,但是作为毕业设计,由于影视版权等种种原因的限制,本系统不能实现影视欣赏这一功能,若本系统日后用于商业用途,取得影视版权后,将有可能实现该功能;后台管理有管理员可以实现添加删除用户,添加删除影视信息等功能。     

我国基础设施建设推行PFI模式的影响因素分析及发展对策研究

本文从我国基础设施建设中推行PFI的影响因素角度，分析了PFI在我国基础设施建设中的推广和应用问题，并提出了促进我国PFI项目的发展对策。     

“小产权房”供地市场的制度成因研究——基于博弈论视阈

研究目的：分析土地市场制度安排的非均衡问题,揭示“小产权房”供地市场的制度成因。研究方法：文献资料法、博弈模型分析法。研究结果：1．在我国社会转型的宏观环境下,“小产权房”供地市场是现有土地制度安排非均衡的结果;2．土地商品价值的认知给农村集体土地带来了潜在的获利机会,产生了土地制度变迁的强烈需求。研究结论：由于国家对土地市场制度改革的滞后,导致农村集体经济组织容易进行诱致性制度安排,从而形成了“小产权房”供地市场。     

DRAMs, fiber and energy compared with three models of market penetration

When a new technology is introduced in the market, this technology generally follows an S-shaped curve, especially if measured on a relative (market share) basis. Marchetti and Nakicenovic and Norton and Bass have modeled the multivariant case of various technologies introduced at different times. A new, simple and flexible model has been proposed based on potential penetration. Potential penetration is penetration on the assumption that no other new technology will enter the market. In a stable competitive environment, potential penetration curves are typically positively sloped S-curves. The new model gives a good fit in markets with a limited number of competitors, which are capable of totally cannibalizing previous generations of technologies. It also fits well with markets with many competitors in a competitive equilibrium situation. Examples are the Dynamic Random Access Memory chips (DRAMs), fiber and energy market. The new model features fewer variables compared with existing models and can readily be adapted to technological processes with time varying parameters, which is particularly important in volatile competitive markets.     

Non-manipulable domains for the Borda count

Summary. We characterize the preference domains on which the Borda count satisfies Arrows independence of irrelevant alternatives condition. Under a weak richness condition, these domains are obtained by fixing one preference ordering and including all its cyclic permutations (Condorcet cycles). We then ask on which domains the Borda count is non-manipulable. It turns out that it is non-manipulable on a broader class of domains when combined with appropriately chosen tie-breaking rules. On the other hand, we also prove that the rich domains on which the Borda count is non-manipulable for all possible tie-breaking rules are again the cyclic permutation domains.Received: 24 November 2003, Revised: 12 December 2004, JEL Classification Numbers: D71. Correspondence to: Clemens PuppeThe third author gratefully acknowledges the financial support from the Deutsche Forschungsgemeinschaft (DFG), Graduiertenkolleg 629 at the University of Bonn and from the Hungarian Scientific Research Fund (OTKA F 043496).     

Large agricultural investments in Kenya’s Nanyuki Area: Inventory and analysis of business models

Many experts agree that more agricultural investment is needed in the global South to improve local food security and reduce poverty. However, there is a lack of consensus about the types of investment needed to achieve these goals. This paper contributes to the literature on large agricultural investments and corresponding business models by inventorying and analysing such investments in Kenya’s Nanyuki area. We identify four clusters of business models that differ primarily by type of production and other distinct determinants, namely: demand from markets; access to land; land tenure regime and colonial history; actors involved; biophysical context; labour availability; and governance of the value chain via private standards. The study results shed light on the factors that help or hinder implementation of large agricultural investments and shape their impacts in the context of African land use systems. The way land is accessed represents one of the most-decisive factors determining the risks and opportunities associated with such projects. We find that most investments in the Nanyuki area occur on land bought or leased from private owners.     

Access prices,unbundling and product variety in European Internet markets

A fundamental policy in European broadband regulation is unbundled access to the local loop of the incumbent telephone company. We present comparative static results that show as the access price decreases, the retail price decreases, the variety of plans offered by Internet service providers increases and the quantity of each variety increases when a threshold condition is met. Using data from 18 European countries from 2006 to 2012, we find empirical support for these results when Internet product variety is measured by variation in download speeds.     

A tale of two Italies: ‘access-orders’ and the Italian regional divide

ABSTRACT

This paper uses the ‘access orders’ paradigm developed by North, Wallis, and Weingast [(2009). Violence and social order: A conceptual framework for interpreting recorded human history. Cambridge: Cambridge University Press] to analyse the case of the Italian North–South economic divide. In line with their framework, we collect and discuss several social and political indicators over the long-run, at the regional level. Firstly we looked at data on the pre-conditions for the establishment of an open-access order, such as murders per capita (a proxy for control over violence), voting turnout and referendums participation (proxies for political legitimacy), and the impersonality of exchange. We then showed evidence of different access orders in the North and in the South, using the information on human capital formation, women participation in the labour market, and referendum results. On the basis of this evidence, we argue that, despite being part of the same State and subject to the same formal institutions, the North of the country progressively developed into an open-access order, while the South remained a form of limited access order.

Institutional differences are linked to specific aspects of the economic performance of the two areas, thus the ‘access order’ paradigm appears to be an effective conceptual scheme to explain the North–South economic divide.