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111.
本文针对高速数字信号处理技术中存在的数据接口问题,分析了几种数据存贮结构,在此基础上给出了一种性能/价格比较优的总线隔离的数据存贮器直接存贮数据接口结构。 相似文献
112.
Using radial super-efficiency data envelopment analysis (DEA) has improved the discriminating performance across efficient decision-making units (DMUs). This paper extends the super-efficiency approach to a non-radial super-efficiency DEA (NRSE-DEA) index. NRSE-DEA is shown to be invariant to units of input (output) measurement. NRSE-DEA is illustrated here via an application to NATO burden-sharing assessment in which the DMUs are the member nations of NATO. The NRSE-DEA provides additional insights into the ranking of efficient countries, suggesting which are absorbing a particularly large share of NATO responsibilities. The NRSE-DEA generates a smaller set of efficient DMUs. This, in turn, provides more discriminatory power, a more accurate measure of super-efficiency, a more meaningful ranking of the efficient burden sharing countries, and a more reliable assessment of contributions by NATO members, amongst other policy issues. 相似文献
113.
Recent technological developments have transformed the cable television industry (CATV) from a simple re-transmitter of terrestrial broadcasting to a provider of a broader-band information infrastructure. With cable operators facing an undesirable market situation while operating a fiber optics network vital to the creation of an information-based society within Japan, the Japanese Government has introduced several supportive measures for the industry. Such governmental intervention should desirably be justified not only from a political viewpoint but also from an economic one; otherwise such measures may distort economic efficiency. In this article, using Data Envelopment Analysis (DEA), the authors identify the deficiencies of an accounting-based intervention scheme and propose an alternative framework with no disincentive side effects. 相似文献
114.
Christopher K.M. Pong 《Journal of Business Finance & Accounting》1999,26(3-4):451-475
This paper examines the issue of auditor concentration in the UK during the period from 1991 to 1995. It shows that in 1995 the Big Six held 75% of the total number of audits and collectively earned 92% of the total audit fees. There was only a small increase in auditor concentration during the five year period, resulting from companies switching from small audit firms to Big Six and newly listed companies choosing a Big Six firm. The paper also examines auditor concentration within industries. Finally, the study assesses the measurement methods most commonly used in auditor concentration studies. 相似文献
115.
本文在简述地质雷达基本原理及工作方法的基础上,阐述了地质雷达的信号识别在土层疏松及空洞探测中的可行性及准确性,并对地质雷达的实测资料进行了处理及分析。结果表明,地质雷达检测技术能有效的探测土层疏松以及空洞异常,从而避免地铁施工过程中地下空洞等地质体对周围环境和施工安全造成的不良影响。 相似文献
116.
We present a multivariate benchmarking model for achieving consistency between large quarterly and annual accounting frameworks. The method is based on a quadratic optimization problem, for which many efficient numeric solvers exist. The method combines several features, such as linear constraints, ratio constraints, weights, and inequalities, in one model. Therefore, a wide range of modelling possibilities is supported. This method is especially interesting for national statistical offices, to simplify their processes to achieve consistency between publications. 相似文献
117.
David A. Weiskopf 《International Journal of the Economics of Business》2000,7(2):159-166
Using store-level scanner data, elasticity matrices are estimated using a twotiered demand system. Two basic models are estimated, one with promotion variables and one without. Differences between the estimates across the two models are statistically significant. However, when the elasticities are used as 'inputs' into several simulation exercises, there are only small differences in merger effects and patent damage estimates.The results suggest that the differences are not 'economically' significant. 相似文献
118.
Data Envelopment Analysis of different climate policy scenarios 总被引:1,自引:0,他引:1
Recent developments in the political, scientific and economic debate on climate change suggest that it is of critical importance to develop new approaches able to compare policy scenarios for their environmental effectiveness, their distributive effects, their enforceability, their costs and many other dimensions. This paper discusses a quantitative methodology to assess the relative performance of different climate policy scenarios when accounting for their long-term economic, social and environmental impacts. The proposed procedure is based on Data Envelopment Analysis, here employed in evaluating the relative efficiency of eleven global climate policy scenarios. The methodology provides a promising comparison framework; it can be seen as a way of setting some basic guidelines to frame further debates and negotiations and can be flexibly adopted and modified by decision makers to obtain relevant information for policy design. Three major findings emerge from this analysis: (i) stringent climate policies can outperform less ambitious proposals if all sustainability dimensions are taken into account; (ii) a carefully chosen burden-sharing rule is able to bring together climate stabilisation and equity considerations; and (iii) the most inefficient strategy results from the failure to negotiate a post-2012 global climate agreement. 相似文献
119.
Using Simulation and Data Envelopment Analysis to Compare Assembly Line Balancing Solutions 总被引:2,自引:0,他引:2
This paper presents a technique for comparing the results of different assembly line balancing strategies by using Data Envelopment Analysis (DEA). Initially, several heuristics--which can be thought of as assembly line balancing strategies--were used to solve seven line-balancing problems. The resulting line balance solutions provided two pieces of information that were of particular interest: the number of workers needed and the amount of equipment needed. These two items were considered inputs for DEA. The different line balance solutions were then used as layouts for simulated production runs. From the simulation experiments, several output performance measures were obtained which were of particular interest and were used as outputs for DEA. The analysis shows that DEA is effective in suggesting which line balancing heuristics are most promising. 相似文献
120.