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LOCAL INFLUENCE ASSESSMENT IN A MULTIVARIATE t-MODEL WITH RAO'S SIMPLE STRUCTURE 被引量:3
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作者 邹清明 张怀雄 《Acta Mathematica Scientia》 SCIE CSCD 2005年第1期179-192,共14页
The local influence analysis is an important problem in statistical inference and some models have been discussed in many literatures This paper deals with the problem of assessing local influences in a multivariate t... The local influence analysis is an important problem in statistical inference and some models have been discussed in many literatures This paper deals with the problem of assessing local influences in a multivariate t-model with Rao's simple struc-ture(RSS). Based on Cook's likelihood displacement, the effects of some minor perturbation on the statistical inference is assessed. As an application, a common covariance-weighted perturbation is thoroughly discussed. 展开更多
关键词 Multivariate t-model Rao's simple structure ω-model likelihood displacement MLE
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Study on the Grey Polynomial Geometric Programming 被引量:1
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作者 LUODang 《Chinese Quarterly Journal of Mathematics》 CSCD 北大核心 2005年第1期34-41,共8页
In the model of geometric programming, values of parameters cannot be gotten owing to data fluctuation and incompletion. But reasonable bounds of these parameters can be attained. This is to say, parameters of this mo... In the model of geometric programming, values of parameters cannot be gotten owing to data fluctuation and incompletion. But reasonable bounds of these parameters can be attained. This is to say, parameters of this model can be regarded as interval grey numbers. When the model contains grey numbers, it is hard for common programming method to solve them. By combining the common programming model with the grey system theory, and using some analysis strategies, a model of grey polynomial geometric programming, a model of θ positioned geometric programming and their quasi-optimum solution or optimum solution are put forward. At the same time, we also developed an algorithm for the problem. This approach brings a new way for the application research of geometric programming. An example at the end of this paper shows the rationality and feasibility of the algorithm. 展开更多
关键词 interval grey numbers grey polynomial geometric programming θ positioned geometric programming ALGORITHM
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DISCUSSION ON MINIMUM FLOW MODEL FOR ITS RELATIONSHIP WITH HAMILTONIAN PATH PROBLEM 被引量:1
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作者 NINGXuan-xi 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2004年第4期322-325,共4页
A negative example shows that the model given by Mason Iri is used to prove that the relationship between the minimum flow problem and the Hamiltonian path problem in a (directed) network, is not rigorous. A new model... A negative example shows that the model given by Mason Iri is used to prove that the relationship between the minimum flow problem and the Hamiltonian path problem in a (directed) network, is not rigorous. A new model called minimum spanning flow in a network is established to revise the old one. It is proved that the problem of determining whether there is a Hamiltonian path from a specified vertex s to another t on a given digraph can be reducible at polynomial time to the problem of constructing a minimum spanning flow in a two-terminal extended network s,t , with the unit capacity for all arcs. 展开更多
关键词 graph theory Hamiltonian path spanning flow
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From Less or No Waste Manufacturing and Cleaner Production to Recycle Economy -- A Review on the Theoretical Research and Practice of Ecological Enterprises in China 被引量:2
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作者 LiuYong 《Ecological Economy》 2005年第2期32-39,共8页
Based on systematical research on the conception evolution of ecological enterprise, theoretical and practical development of constructing ecological enterprise, the paper makes conclusion that ecological enter- prise... Based on systematical research on the conception evolution of ecological enterprise, theoretical and practical development of constructing ecological enterprise, the paper makes conclusion that ecological enter- prises are developing into a new stage in which governments are launching some pilot projects about construct- ing ecological enterprises. And after that, governments should make policies to spread construction of ecological enterprises, to construct ecological enterprises in legal system and conforming to the standard as soon as possibly. So that, the basic units of ecological economy that fit to the conditions of China will be set up. 展开更多
关键词 ecological enterprises cleaner production recycle economy the system of environment management implements of cleaner production.
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Financial Supports to the Rejuvenation of the Old Industrial Base of Northeast China
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作者 CONGDan-yang LIYou-hua TANGXiu-qin 《Journal of Northeast Agricultural University(English Edition)》 CAS 2004年第2期184-186,共3页
Supporting the reconstruction and reform of the old industrial base in Northeast China is a significant strategy made by the Central Government. With the strategy going into effect, it will be a great opportunity for ... Supporting the reconstruction and reform of the old industrial base in Northeast China is a significant strategy made by the Central Government. With the strategy going into effect, it will be a great opportunity for the economy and finance development in Northeast. Based on the financial facts in Northeast China and the analyses on the key issues concerning finance and the rejuvenation of the old industrial base, countermeasures in five aspects are put forwarded in this paper. 展开更多
关键词 the old industrial base REJUVENATION money raising non-performing loans
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Increasing Subsidies to Main Grain Production Area——Necessity of the Rejuvenation of Northeast China
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作者 WEIHeng LIYou-hua CONGDan-yang 《Journal of Northeast Agricultural University(English Edition)》 CAS 2004年第2期187-190,共4页
As an old industrial base, Northeast China is one of the most important grain production base. To rejuvenate Northeast China, it is necessary to strengthen farming products processing, lengthen industrial chain and de... As an old industrial base, Northeast China is one of the most important grain production base. To rejuvenate Northeast China, it is necessary to strengthen farming products processing, lengthen industrial chain and develop sustainable agriculture. 展开更多
关键词 old industrial base main grain production area development
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Grassland Degradation,Construction and the Econmic-technological Strategies of Sustainable Development of Grassland-agriculture
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作者 WANGHua YUHua-ying +1 位作者 OKAMOTOChinobu WANGYu-sheng 《Journal of Northeast Agricultural University(English Edition)》 CAS 2004年第1期52-56,共5页
Natural grassland in the West of Northeastern China is located in 40°0′- 43°5′N latitude and 117°0′ -127°5′Elongitude. It lies in the Liao River Valley, the Songhua River Valley and Nen River V... Natural grassland in the West of Northeastern China is located in 40°0′- 43°5′N latitude and 117°0′ -127°5′Elongitude. It lies in the Liao River Valley, the Songhua River Valley and Nen River Valley. About 130 years ago, this region had rich natural grassland resources, was numerically 26.67 millions in hectare of grasslands. Since the last stage of Qing Dynasty, the grassland has been destroyed seriously in 3 times. Up to now, this region only preserved about 2 millions in hectare of the grasslands. In addition, 3.33 millions in hectare of the grasslands have changed from primary grassland to desertification, salinizatio-nalkalinization and degeneration grasslands in the form of patches of bare soil(their simple form of a name is'3 kinds of degeneration grasslands'). This paper indicaed that in any period both grasslands destruction and its restoration were relevant to economic changes and economic systems, particularly to market econmy in that time. The following agricultural economic-technological strategies have been applied to transform of retrogressive grasslands: ① to return reclaimed grassland as farmland to primary grassland in order to greatly increase-economic ecological benefits; ② to close desertification, salinizationalkalinization and degradation grasslands in the form of patches of bare soil; ③to develop grassland-agriculture for establishment of stable production bases of concentrated feed crops and coarse herbage crops. 展开更多
关键词 economic-technological strategy economic benefit grassland destruction vegetation restoration
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An Analysis on the Inconsistency of the Security Supervision Policy in the Method of Game Theory
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作者 WANGXing-yu JIAXing-qin 《Chinese Quarterly Journal of Mathematics》 CSCD 2003年第1期93-98,共6页
This article expounds and proves the basic model of the inconsistency of the security supervision policy and makes an analysis in the method of game theory on the inconsistency of the security transaction-tax-rate pol... This article expounds and proves the basic model of the inconsistency of the security supervision policy and makes an analysis in the method of game theory on the inconsistency of the security transaction-tax-rate policy, concludes that the security supervision department is inclined to increase or decrease the security transaction tax rate, thus points out ways for supervision department to surmount this difficulty. 展开更多
关键词 SECURITY supervision policy GAME
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Model of Cost-benefit Flow in Six Green Projects in China
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作者 ZhuYongjie ZhouBoling 《Forestry Studies in China》 CAS 2003年第3期49-53,共5页
From the point of cost-benefit flow and with the Six Green Projects in China as the case and background, it is criticized that the current natural resource and environmental management and the policies in China have s... From the point of cost-benefit flow and with the Six Green Projects in China as the case and background, it is criticized that the current natural resource and environmental management and the policies in China have some problems unsolved since the model of cost-benefit flow is still centralized and mainly in an administrative way in spite of many efforts made theoretically and practically. It is suggested that a new model based on market-oriented economy from the point of cost-benefit flow with Six Green Projects Management and Policies System consist of complete natural reserve (NR). Management system included environmental nature reserves in addition to biodiversity nature reserve, paid using nature resources, an environmental conservation and construction industry and renewable resource production incentive system that turn the direct administration and operation to management and services. The detail figure of the new model of cost-benefit flow is provided and the main points related are discussed in this paper. 展开更多
关键词 Six Green Projects model of cost-benefit flow management and policy frame
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中国城乡居民对粮食安全的态度、风险承受能力及其影响因素分析
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作者 HaifengXiao 《中国农业经济评论》 2003年第3期374-384,共11页
城乡居民对粮食安全的态度与风险承受能力是中国政府制定和完善粮食安全政策的重要依据。本文根据在4个不同级别城市(北京、郑州、顺德、榆林)和3个不同特点农村县(榆树、中山、榆林)专门进行的居民家庭抽样调查数据,对中国城乡居民对... 城乡居民对粮食安全的态度与风险承受能力是中国政府制定和完善粮食安全政策的重要依据。本文根据在4个不同级别城市(北京、郑州、顺德、榆林)和3个不同特点农村县(榆树、中山、榆林)专门进行的居民家庭抽样调查数据,对中国城乡居民对粮食安全的态度、风险承受能力及其影响因素进行了分析。并在此基础上提出相应的政策建议。 展开更多
关键词 中国 粮食安全 风险承受能力 城市居民 农村居民 抽样调查
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ON THE INVERSE MINIMUM SPANNING TREE PROBLEM WITH MINIMUM NUMBER OF PERTURBED EDGES 被引量:1
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作者 BangyiLI ZhaohanSHENG 《Systems Science and Systems Engineering》 CSCD 2003年第3期350-359,共10页
Let G=<V, E, L> be a network with the vertex set V, the edge set E and the length vector L, and let T* be a prior determined spanning tree of G. The inverse minimum spanning tree problem with minimum number of p... Let G=<V, E, L> be a network with the vertex set V, the edge set E and the length vector L, and let T* be a prior determined spanning tree of G. The inverse minimum spanning tree problem with minimum number of perturbed edges is to perturb the length vector L to L+ , such that T* is one of minimum spanning trees under the length vector L+ and the number of perturbed edges is minimum. This paper establishes a mathematical model for this problem and transforms it into a minimum vertex covering problem in a bipartite graph G0, a path-graph. Thus a strongly polynomial algorithm with time complexity O(mn2) can be designed by using Hungarian method. 展开更多
关键词 Inverse network optimization problem minimum spanning tree vertex covering set
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Study on China’s Import Trade and Market in Main Forest Products
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作者 TIANGang 《Chinese Forestry Science and Technology》 2005年第2期44-48,共5页
The forest products trade from other countries to China is predominantly and tremendously increasing and many dealers, officials and scholars are convinced that this trend will continue. This paper covers 5 topics: (1... The forest products trade from other countries to China is predominantly and tremendously increasing and many dealers, officials and scholars are convinced that this trend will continue. This paper covers 5 topics: (1) Analysis on China’s forest resources; (2) Analysis on the supply and demand factors of forest products in China; (3) The import trade of recent main forest products in China; (4) The market characteristics of forest products in China; (5)The development trends of forest products in China. 展开更多
关键词 main forest products import trade MARKET China
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