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ROBUST ESTIMATION OF VARIANCE COMPONENTS MODEL

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中国有色金属学会会刊：英文版 1999年第1期9卷 194-198页

作者： Zhizhong, Wang jianjun, zhu Central South Univ of Technology Changsha China

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｌｅａｓｔｓｑｕａｒｅｓｍｅｔｈｏｄｉｓａｖｅｒｙｐｏｐｕｌａｒｅｓｔｉｍａｔｉｏｎｔｅｃｈｎｉｑｕｅｉｎｔｈｅｌｉｎｅａｒｒｅｇｒｅｓｉｏｎ（ａｄｊｕｓｔｍｅｎｔ）ｍｏｄｅｌ．Ｂｕ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｌｅａｓｔｓｑｕａｒｅｓｍｅｔｈｏｄｉｓａｖｅｒｙｐｏｐｕｌａｒｅｓｔｉｍａｔｉｏｎｔｅｃｈｎｉｑｕｅｉｎｔｈｅｌｉｎｅａｒｒｅｇｒｅｓｉｏｎ（ａｄｊｕｓｔｍｅｎｔ）ｍｏｄｅｌ．Ｂｕｔｉｎｓｐｉｔｅｏｆｉｔｓｍａｔｈ...

关键词： influence function robust estimation variance component

Evolutionary game analysis of problem processing mechanism in new collaboration

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Journal of Systems Engineering and Electronics 2021年第1期32卷 136-150页

作者： ZHANG Ming zhu jianjun WANG Hehua College of Economics and Management Nanjing University of Aeronautics and AstronauticsNanjing 211106China School of Business Jinling Institute of TechnologyNanjing 211169China

This paper analyzes a problem processing mechanism in a new collaboration system between the main manufacturer and the supplier in the"main manufacturer-supplier"mode,which has been widely applied in the collaborative development management of the complex *** paper adopts the collaboration theory,the evolutionary game theory and numerical simulation to analyze the decision-making mechanism where one upstream supplier and one downstream manufacturer must process an unpredicted problem without any advance contract in *** show that both players'decision-makings are in some correlation with the initial state,income impact coefficients,and dealing *** is worth noting that only the initial state influences the final decision,while income impact coefficients and dealing cost just influence the decision *** paper shows reasonable and practical suggestions for the manufacturer and supplier in a new collaboration system for the first time and is dedicated to the managerial implications on reducing risks of processing problems.

关键词： collaborative development management unpredicted problem problem processing mechanism evolutionary game theory

Strategic Cooperation with Differential Suppliers' Ability under Downstream Competition in Complex Products Systems

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Journal of Systems Science and Systems Engineering 2019年第4期28卷 449-477页

作者： Jinhua Zhou jianjun zhu Hehua Wang College of Economics and Management Nanjing University of Aeronautics and Astronautics Nanjing 211106 China School of Business Jinling Institute of TechnologyNanjing 211169 China

This paper investigates the strategic cooperation of two competitive suppliers with different abilities and a weak main manufacturer in Complex Products Systems (CoPS), where a main manufacturer signs a revenue-sharing contract based on a relationship-specific investment with the stronger supplier. The stronger supplier provides one key element to the main manufacturer and encroaches on the downstream market by producing substitutable final products simultaneously. We consider multi-period decisions, by building different models based on centralized, decentralized, and cooperative decisions. The equilibrium strategies are characterized under downstream competition, and optimal cooperation strategies are derived by building multi-period game models. The results show that strong cooperation can enhance the economic performance of each individual as well as the whole supply chain. The weak main manufacturer would face the risk of strong suppliers' supply interruptions when the competitive degree of suppliers and downstream competition are fierce enough under decentralized decisions. Additionally, the gap in the abilities of the two competitive suppliers reduces the main manufacturer's profitability. However the revenue-sharing contract based on a relationship-specific investment can motivate the strong supplier to establish cooperation relationship and improve both stakeholders' profitability. Moreover, strategic cooperation is efficient to prevent the strong supplier encroaching on downstream and has a positive impact on boosting the weak main manufacturer's market share. Meanwhile, nurturing a domestic supplier is an effective measure for improving competitiveness and indigenous technological capability of the main manufacturer in CoPS. Finally, some useful management sights on cooperation strategy and optimal decisions are derived.

关键词： Cooperation downstream competition CoPS contract coordination suppliers' ability

Ergodic stationary distribution of a stochastic rumor propagation model with general incidence function

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Chinese Physics B 2022年第6期31卷 145-154页

作者： Yuhuai Zhang jianjun zhu College of Economics and Management Nanjing University of Aeronautics and AstronauticsNanjing 211106China

In daily lives,when emergencies occur,rumors will spread widely on the ***,it is quite difficult for the netizens to distinguish the truth of the *** main reasons are the uncertainty of netizens’behavior and attitude,which make the transmission rates of these information among social network groups be not *** this paper,we propose a stochastic rumor propagation model with general incidence *** model can be described by a stochastic differential *** the Khasminskii method via a suitable construction of Lyapunov function,we first prove the existence of a unique solution for the stochastic model with probability *** we show the existence of a unique ergodic stationary distribution of the rumor model,which exhibits the *** also provide some numerical simulations to support our theoretical *** numerical results give us some possible methods to control rumor ***,increasing noise intensity can effectively reduce rumor propagation when R_(0)>1That is,after rumors spread widely on social network platforms,government intervention and authoritative media coverage will interfere with netizens’opinions,thus reducing the degree of rumor ***,speed up the rumor refutation,intensify efforts to refute rumors,and improve the scientific quality of netizen(i.e.,increase the value ofβand decrease the value ofαandγ),which can effectively curb the rumor propagation.

关键词： rumor propagation model general incidence function It?’s formula ergodic stationary distribution

Research on consistency measurement and weight estimation approach of hybrid uncertain comparison matrix

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Journal of Systems Engineering and Electronics 2008年第6期19卷 1145-1150页

作者： zhu jianjun zhu Ningning Liu Sifeng Li Tao Wang Hehua Coll. of Economics and Management Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China

The consistency measurement and weight estimation approach of the hybrid uncertain comparison matrix in the analytic hierarchy process （AHP） are studied. First, the decision-making satisfaction membership function is defined based on the decision making＇s allowable error. Then, the weight model based on the maximal satisfactory consistency idea is suggested, and the consistency index is put forward. Moreover, the weight distributing value model is developed to solve the decision making misleading problem since the multioptimization solutions in the former model. Finally, the weights are ranked based on the possibility degree approach to obtain the ultimate order.

关键词： analytic hierarchy process, uncertainty hybrid comparison matrix, weight

Dynamic hesitant fuzzy linguistic group decision-making from a reliability perspective

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Journal of Systems Engineering and Electronics 2018年第5期29卷 1009-1021页

作者： MA Zhenzhen PONNAMBALAM Kumaraswamy zhu jianjun ZHANG Shitao College of Economics and Management Nanjing University of Aeronautics and Astronautics Department of Systems Design Engineering University of Waterloo School of Mathematics & Physics Science and Engineering Anhui University of Technology

A dynamic hesitant fuzzy linguistic group decisionmaking(DHFLGDM) problem is studied from the perspective of information reliability based on the theory of hesitant fuzzy linguistic term sets(HFLTSs). First, an approach is applied to transform the dynamic HFLTSs(DHFLTSs) into a set of proportional linguistic terms to eliminate the time dimension. Second, expert reliability is measured by considering both group similarity and degree of certainty, and an optimization method is employed to quantify the linguistic terms by maximizing the group similarity. Third, through computing the attribute stability as well as its reliability, a combination rule which considers both reliability and weight is proposed to aggregate the information, and then the aggregated grade values and degree of stability are used to make a selection. Finally,the application and feasibility of the proposed method are verified through a case study and method comparison.

关键词： dynamic decision-making hesitant fuzzy linguistic term sets(HFLTSs) proportional linguistic terms group similarity degree of certainty

Experimental studies on overall property of thermoelectric modules with sandwiched structures

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Chinese Science Bulletin 2014年第5期59卷 571-576页

作者： jianjun zhu Zhen Li Xing Zhang Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua University

Based on direct-current transient Harman method,an integrated characterization system of thermoelectric device’s performance is *** overall properties of thermoelectric modules with sandwiched structures are experimentally investigated,including Seebeck coefficients,figures of merit(ZT),electrical and thermal *** results reveal that ZT values of thermoelectric modules are smaller than those of commercial bismuth telluride(Bi2Te3)*** contrast,Seebeck coefficients are significantly larger than traditional thermoelectric device’s ***,both electrical and thermal conductivities are greater compared with literature *** results have proposed a feasible and economical way that can potentially increase Seebeck coefficients as to bulk Bi2Te3materials without significant deterioration to the nature of Peltier effect.

关键词：热电器件模块性能结构塞贝克系数试验珀尔帖效应表征系统

Inversion of vegetation height from Pol In SAR using complex least squares adjustment method

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Science China Earth Sciences 2015年第6期58卷 1018-1031页

作者： FU HaiQiang WANG ChangCheng zhu jianjun XIE QingHua ZHAO Rong School of Geosciences and Info-physics Central South University

In this paper, we propose the novel method of complex least squares adjustment （CLSA） to invert vegetation height accurately using single-baseline polarimetric synthetic aperture radar interferometry （PollnSAR） data. CLSA basically estimates both volume-only coherence and ground phase directly without assuming that the ground-to-volume amplitude radio of a particular polarization channel （e.g., HV） is less than -10 dB, as in the three-stage method. In addition, CLSA can effectively limit errors in interferometric complex coherence, which may translate directly into erroneous ground-phase and volume-only coherence estimations. The proposed CLSA method is validated with BioSAR2008 P-band E-SAR and L-band SIR-C PollnSAR data. Its results are then compared with those of the traditional three-stage method and with external data. It implies that the CLSA method is much more robust than the three-stage method.

关键词： polarimetric SAR interferometry (PolInSAR) complex least squares adjustment random volume over ground (RVoG) vegetation height inversion truncated singular value decomposition (T-SVD)

A type of polarimetric parameter for evaluating the reliability of model-based decomposition result and its application

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International Journal of Digital Earth 2023年第1期16卷 2111-2128页

作者： Wentao Han Haiqiang Fu jianjun zhu Qinghua Xie School of Geosciences and Info-Physics Central South UniversityChangshaPeople’s Republic of China School of Geography and Information Engineering China University of Geosciences(Wuhan)WuhanPeople’s Republic of China

The reliability of the model-based decomposition result,which is seldom investigated,is a key factor in determining whether decomposition parameters can be effectively applied to polarimetric synthetic aperture radar(PolSAR)*** this paper,a type of polarimetric parameter for evaluating the reliability of model-based decomposition result is *** originates from the degree of correlation between the scattering *** main idea is whether the measured power can be assigned to the corresponding scattering *** more the measured power that can be allocated to the corresponding scattering model,the more reliable the decomposition *** C-band Radarsat-2,L-band UAVSAR,X-band TerraSAR-X,and L-band E-SAR PolSAR data are selected for *** results show that the type of polarimetric parameter can effectively represent the reliability of the decomposition *** reliabilities of surface and double-bounce scattering are high in the ocean and orthogonal buildings,*** oriented buildings,the reliability of the decomposition result is lower owing to the overestimation of volume *** forested areas,reliability is generally higher if volume scattering is not ***,the results show that the reliability of soil moisture retrieval is positively correlated with surface scattering reliability.

关键词： Model-based decomposition decomposition reliability model correlation soil moisture inversion PolSAR