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Evaluating returns to scale and congestion by production possibility set in intersection form

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Science China Mathematics 2011年第4期54卷 831-844页

作者： wei quanling YAN Hong Institute of Economics Renmin University of ChinaBeijing 100872China Department of Logistics and Maritime Studies Hong Kong Polytechnic UniversityKowloonHongkongChina

This research proposes a new method to estimate returns to scale(RTS) of decision making units(DM Us) with multiple inputs and *** state of return to scale includes increasing RTS,constant RTS,decreasing RTS and evidence of *** method is based on the production possibility set in the intersection form given by a set of linear *** propose and prove the necessary and sufficient conditions for the RTS *** the new procedure,to estimate the RTS of a DM U is simply to check the position of the DM U on the production *** point out that the procedure is particularly important for dealing with a large number of DM U ***,it can be regarded as a complementary to the data mining.

关键词： DEA production possibility set intersection form return to scale congestion

Data envelopment analysis

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Chinese Science Bulletin 2001年第16期46卷 1321-1332页

作者： wei quanling Institute of Operations Research and Mathematical Economics, Renmin University of China, Beijing 100872, China Institute of Operations Research and Mathematical Economics Renmin University of China Beijing China

This review introduces the history and present status of data envelopment analysis (DEA) research, particularly the evaluation process. And extensions of some DEA models are also described. It is pointed out thatmathematics, economics and management science are themain forces in the DEA development, optimization provides the fundamental method for the DEA research, and the wide range of applications enforces the rapid development ofDEA.

关键词： data envelopment analysis non-dominated solution production frontier.

Evaluating Efficiency of Decision Making Units with Network Structures

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Journal of Systems Science and Information 2009年第3期7卷 231-244页

作者： quanling wei Hong Yan Institute of Operations Research and Mathematical Economies Renmin University of China Beijing 100872 China Department of Logistics and Maritime Studies The Hong Kong.Polytechnic University

This paper considers the problem of evaluating efficiency of Decision Making Units （DMUs） with network structures of divisions by the Data Envelopment Analysis （DEA） model. All divisions in the network are under a decentralized authority organiza- tion. That is, each division in a decision making unit has its own authority to adjust its input and output. By incorporating the division operations in the DEA model, we discuss the sufficient and necessary conditions for a DMU to be network efficient in series structure and general structure respectively.

关键词： data envelopment analysis network DEA multi-stage production efficiency

An　Integral　Method　for　the　Measurement　of　Technological　Progress　and　Data　Envelopment　Analysis

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Systems Science and Systems Engineering 1996年第1期6卷 75-86页

作者： wei quanling(Institute of Operation Research Mathematics of EconomicsThe People’s Univ.of China,Beijing 100872,China)CHIANG Wen-Chyuan(Department of Quantitative Methods and MIS College of Business,The Univ.of Tulsa,Tulsa OK 74104,USA)

DEA method can be regarded as a non-parametric statistical estimating method which is applied to the determination of the frontier production *** Technological progress can be studied by the change of frontier production *** this paper, using the efficient frontier face obtained from DEA method,the new methoan integral method for estimating the speed of technological progress of enterprise group is *** integral method for estimating the speed of technonlogical progress of enterprise group in the case of an arbitray number of inputs for factor augmenting technological progress is *** assumption of the homogeneity of degree 1 for the production function is relaxed to the general case.A case study from application of Chinese agriculture demonstrates the usefulness of the method.

关键词： Technological Progress Data Envelopment Analysis Mathematical Programming

USING DISPLACED CONE REPRESENTATION IN DEA MODELS FOR NONDOMINATED SOLUTIONSIN MULTIOBJECTIVE PROGRAMMING

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Systems Science and Mathematical Sciences 1997年第1期10卷 41-49页

作者： W. W. Cooper (Graduate School Of Business, University of Texas at Austin, Austin, Texas, USA 78712-1174)wei quanling (Department of Information Management, People’s University of China, Beliing 100872, China) G. Yu (Department of MSIS, University of Texas University of Texas 美国中国人民大学信息管理系北京

Concepts revolving around "displaced cones" are used to extend the ideas of nondominated solutions in multiobjective programming. Necessary and sufficient conditions are formed around the additive models of DEA to idelltify nondominated solutions. This provdes a basis for effecting contacts with other disciplines and other parts of DEA.

关键词： Multi-objective programming efficiency dominance data envelopment analysis

KULKARNI'S QUESTION AND ERDS CONJECTURE

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Chinese Science Bulletin 1988年第22期33卷 1835-1840页

作者：冯克勤魏权龄刘木兰 University of Science Technology of China Hefei People's University of China Beijing Institute of Systems Science Academia Sinica Beijing

R. Kulkarni has proposed the following question: For a given positive real number A and a natural number n, consider the numbers of the

关键词： nonlinear integer programming Egyptin fraction diophantine equation

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DEA方法与技术进步评估

系统工程学报 1991年第2期6卷 1-11页

作者：魏权龄 D. B. Sun 肖志杰中国人民大学 College of Business Administration University of Maine U.S.A.

本文通过由DEA模型确定生产前沿面的途径,给出了测量技术水平和技术进步速度的模型,并且讨论了估计每个决策单元技术进步的相对年限的方法。文章不仅对常见的中性技术进步作了研究,也对要素增长型技术进步进行了讨论。最后,通过一个例... 详细信息

本文通过由DEA模型确定生产前沿面的途径,给出了测量技术水平和技术进步速度的模型,并且讨论了估计每个决策单元技术进步的相对年限的方法。文章不仅对常见的中性技术进步作了研究,也对要素增长型技术进步进行了讨论。最后,通过一个例子的运算,对模型作了进一步验证。

关键词：技术进步数据包络分析法评估

OXA-23 overproduction caused by insertion sequence ISAbal is associated with resistance to imipenem in Acinetobacter baumannii

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OXA-23 overproduction caused by insertion sequence ISAbal is...

中华医学会第七次全国中青年检验医学学术会议

作者： Dawei Wu DianJun wei quanling Ma The Laboratory of Medicine The Second HospitalTianjin Medical University

A total of eight Imipenem-resistant Acinetobacter baumannii isolates were tested for the presence of blaOXA-23 carbapenemase *** amplification revealed the gene was positive in all isolates and the ISAbal was located ...

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吉兰泰杜氏盐藻中类胡萝卜素的分析和鉴定

天然产物研究与开发 2000年第6期12卷 56-60页

作者：李淑清索全伶杨伟内蒙古工业大学化学工程系呼和浩特010062

利用高压液相色谱 ( HPL C)技术及 IR、1H NMR、MS、UV等现代测试手段 ,对吉兰泰杜氏盐藻中的类胡萝卜素等色素及胡萝卜素异构体进行了分析与鉴定。研究结果表明 ,吉兰泰杜氏盐藻中含有 11种类胡萝卜素 ,其中 β-胡萝卜素包含 7-顺式、9... 详细信息

利用高压液相色谱 ( HPL C)技术及 IR、1H NMR、MS、UV等现代测试手段 ,对吉兰泰杜氏盐藻中的类胡萝卜素等色素及胡萝卜素异构体进行了分析与鉴定。研究结果表明 ,吉兰泰杜氏盐藻中含有 11种类胡萝卜素 ,其中 β-胡萝卜素包含 7-顺式、9-顺式、15-顺式、全反式等 4种异构体。吉兰泰杜氏盐藻中的这些类胡萝卜素对人体十分有益 ,具有开发利用的价值。

关键词：杜氏盐藻类胡萝卜素高压液相色谱分析