检索结果-南通市图书馆

Prediction of efficient outputs based on GM(1,N) model and weak DEA efficiency

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2011年第6期22卷 933-939页

作者： Jiefang Wang sifeng liu College of Economics and Management Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China College of Management and Economics North China University of Water Resources and Electric Power Zhengzhou 450000 E R. China

This paper expresses the efficient outputs of decisionmaking unit（DMU） as the sum of ＂average outputs＂ forecasted by a GM（1,N） model and ＂increased outputs＂ which reflect the difficulty to realize efficient *** increased outputs are solved by linear programming using data envelopment analysis efficiency theories,wherein a new sample is introduced whose inputs are equal to the budget in the issue No.n ＋ 1 and outputs are forecasted by the GM（1,N） *** shortcoming in the existing methods that the forecasted efficient outputs may be less than the possible actual outputs according to developing trends of input-output rate in the periods of pre-n is *** new prediction method provides decision-makers with more decisionmaking information,and the initial conditions are easy to be given.

关键词： efficient outputs GM(1 N) model data envelopment analysis(DEA) weak DEA efficiency prediction.

Prediction model of interval grey number based on DGM(1,1)

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2010年第4期21卷 598-603页

作者： Bo Zeng sifeng liu Naiming Xie College of Business Planning Chongqing Technology and Business University Chongqing 400067 E R. China College of Economics and Management Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China

In grey system theory,the studies in the field of grey prediction model are focused on real number sequences,rather than grey number ***,a prediction model based on interval grey number sequences is *** mining the geometric features of interval grey number sequences on a two-dimensional surface,all the interval grey numbers are converted into real numbers by means of certain algorithm,and then the prediction model is established based on those real number *** entire process avoids the algebraic operations of grey number,and the prediction problem of interval grey number is usefully ***,through an example＇s program simulation,the validity and practicability of this novel model are verified.

关键词： grey system theory prediction model interval grey number grey number band grey number layer DGM(1 1) model.

Using the Fractional Order Method to Generalize Strengthening Buffer Operator and Weakening Buffer Operator

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2018年第6期5卷 1074-1078页

作者： Lifeng Wu sifeng liu Yingjie Yang College of Economics and Management Hebei University of EngineeringHandan 056038China Centre for Computational Intelligence De Montfort UniversityLeicester LE1 9BHUK Institute for Grey System Studies Nanjing University of Aeronautics and AstronauticsNanjing 210016China

To reveal the relationship between a weakening buffer operator and strengthening buffer operator, the traditional integer order buffer operator is extended to one that is fractional order. Fractional order buffer operator not only can generalize the weakening buffer operator and the strengthening buffer operator, but also results in small adjustments of the buffer *** effectiveness of the grey model(GM(1,1)) with the fractional order buffer operator is validated by six cases.

关键词： Fractional order grey system theory strengthening buffer operator (SBO) weakening buffer operator (WBO)

Extension of TOPSIS for fuzzy multi-attribute decision making problem based on experimental analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2010年第3期21卷 416-422页

作者： Min Tian Yuanyuan He sifeng liu College of Economics and Management Nanjing University of Aeronautics and Astronautics Nanjing 210016 P. R. China

This paper is concerned with a technique for order performance by similarity to ideal solution（TOPSIS） method for fuzzy multi-attribute decision making,in which the information about attribute weights is partly known and the attribute values take form of triangular fuzzy *** the fact that the triangular fuzzy TOPSIS results yielded by different distance measures are different from others,a comparative analysis of triangular fuzzy TOPSIS ranking from each distance measure is illustrated with discussion on standard *** applying the most reasonable distance,the deviation degrees between attribute values are measured.A linear programming model based on the maximal deviation of weighted attribute values is established to obtain the attribute ***,alternatives are ranked by using TOPSIS ***,a numerical example is given to show the feasibility and effectiveness of the method.

关键词： fuzzy multi-attribute decision making technique for order performance by similarity to ideal solution(TOPSIS) method triangular fuzzy number distance measure.

TWO-STAGE ORDERING DECISION FOR A SHORT-LIFE-CYCLE PRODUCT

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2006年第3期15卷 340-358页

作者： Bin liu Jian CHEN Shu WU sifeng liu Department of Management Science Henan Agricultural University Zhen g zhou 450002China School of Economics and Management Tsinghua University Beijing 100084 China College of Economics and Management Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

This paper investigates the ordering decision problem for a short-life-cycle product under Bayesian updating. For a product characterized by a single manufacturing cycle and two selling periods, we depict a Two-Stage （TS） ordering strategy with a stochastic dynamic programming model in the view of the whole system, and prove that the expected profit function of the whole system is concave on the first ordering quantity and the remedial ordering quantity, respectively. Then, the optimal ordering decision is developed. Finally, characteristics of the optimal ordering quantities are analyzed with several examples. Our results show that the suggested TS decision model is better than a Quick Response （QR） decision model.

关键词： Short-life-cycle product Bayesian updating ordering quantity stochastic dynamic programming

Fundamental definitions and calculation rules of grey mathematics: a review work

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第6期26卷 1254-1267页

作者： Qiaoxing Li sifeng liu Jeffrey Yi-Lin Forrest School of Management Guizhou University School of Economics and Management Nanjing University of Aeronautics and Astronautics Centre of Computational Intelligence De Montfort University School of Business Slippery Rock University

Grey mathematics is the mathematical foundation of the grey system theory. Recently, some important results have been achieved. In order to accelerate the development of grey mathematics, the results are summarized and redefined. This paper includes the fundamental definitions and calculation rules of the grey hazy set, grey number, grey matrix and grey function. Grey mathematics includes four types of operation, i.e. the grey operation, the whitened operation, the covered operation and the only potential true operation. According to its intrinsic quality, the covered operation, which differs from the interval one, is called as the whole-proximate calculation that means the proximate calculation spreads through the whole range of the covered set of every grey number, and we confirm that it may be a new branch of computational or applied mathematics. The overview should develop the grey system theory and grey mathematics.

关键词： grey mathematics grey hazy set grey number covered operation grey system theory.

Interval grey number sequence prediction by using non-homogenous exponential discrete grey forecasting model

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2015年第1期26卷 96-102页

作者： Naiming Xie sifeng liu College of Economics and Management Nanjing University of Aeronautics and Astronautics Institute of Grey System Studies Nanjing University of Aeronautics and Astronautics

This paper aims to study a new grey prediction approach and its solution for forecasting the main system variable whose accurate value could not be collected while the potential value set could be defined. Based on the traditional nonhomogenous discrete grey forecasting model（NDGM）, the interval grey number and its algebra operations are redefined and combined with the NDGM model to construct a new interval grey number sequence prediction approach. The solving principle of the model is analyzed, the new accuracy evaluation indices, i.e. mean absolute percentage error of mean value sequence（MAPEM） and mean percent of interval sequence simulating value set covered（MPSVSC）, are defined and, the procedure of the interval grey number sequence based the NDGM（IG-NDGM） is given out. Finally, a numerical case is used to test the modelling accuracy of the proposed model. Results show that the proposed approach could solve the interval grey number sequence prediction problem and it is much better than the traditional DGM（1,1） model and GM（1,1） model.

关键词： grey number grey system theory interval discrete grey forecasting model non-homogeneous exponential sequence

Reliability Evaluation of All-User Terminals in LEO Satellite Communication Network Based on Modular Reduction

在线全文

学校读者我要写书评

暂无评论

China Communications 2022年第2期19卷 235-246页

作者： Yangyang Du sifeng liu Zhigeng Fang Su Gao College of Economics and Management Nanjing University of Aeronautics&AstronauticsNanjing 211106Jiangsu ProvinceChina Institute of Telecommunication Satellite China Academy of Space Technology(CAST) Beijing 100094China

LEO satellite communication network has a large number of satellites distributed in low orbits,which leads to multiple coverage of many areas on the *** is hard work to describe and evaluate the reliability of LEO satellite communication *** solve this problem,the reliability of all-user terminals in LEO satellite communication network is defined,and the corresponding reliability evaluation method is proposed in the *** to the large scale of the interstellar network,a modular reduction algorithm using the modular network instead of the original network for state decomposition is proposed in this *** study shows that the calculation time of the proposed method is equivalent to 6.28%of the original state space decomposition *** this basis,the reliability of LEO satellite communication network is further *** is found that the reliability of LEO satellite network was more sensitive to the reliability of Inter-Satellite link and the satisfaction of global coverage in the early stage,and it is more sensitive to the reliability of the satellite in the later *** satellite-ground link has a relatively constant impact on of LEO satellite network.

关键词： reliability evaluation LEO satellite communication network modular approach full probability formula all-user terminals

A DEA-TOPSIS METHOD FOR MULTIPLE CRITERIA DECISION ANALYSIS IN EMERGENCY MANAGEMENT

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2009年第4期18卷 489-507页

作者： Ye CHEN Kevin W. LI Haiyan XU sifeng liu College of Economies and Management Nanjing University of Aeronautics and Astronautics Nanjing Jiangshu 210016 China Odette School of Business University of Windsor Windsor Ontatio N9B 3P4 Canada Department of Systems Design Engineering University of Waterloo Waterloo Ontario N2L3G1 Canada

A hybrid approach of DEA （data envelopment analysis） and TOPSIS （technique for order performance （preference） by similarity to ideal solution） is proposed for multiple criteria decision analysis in emergency management. Two DEA-based optimization models are constructed to facilitate identifying parameter information regarding criterion weights and quantifying qualitative criteria in TOPSIS. An emergency management case study utilizing data from the Emergency Management Australia （EMA） Disasters Database is provided to demonstrate the feasibility of the proposed analysis procedure.

关键词： Multiple criteria decision analysis multiple criteria ranking DEA TOPSIS emergency management