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Study on an intelligent fault-tolerant technique for multiple satellite configured navigation under highly dynamic conditions

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Science china(Information Sciences) 2011年第3期54卷 529-541页

作者： WANG ShiCheng 1 , ZHAO Xin 1 , MIN HaiBo 1 , LIU ZhiGuo 1 & SI XiaoSheng 2.1 High-Tech Institute of Xi’an, Xi’an 71002., china 2.department of Automation,{2., Beijing 100084, china 1. High-Tech Institute of Xi’an Xi’an 710025 China2. Department of Automation Tsinghua University Beijing 100084 China

The probability of pseudo-range information being faulty will increase when there is increased noise in the receiver due to highly dynamic conditions. In this paper, an intelligent fault-tolerant federated Kalman filter (IFFKF) is presented to solve the problem of invalid position information as a result of the uncertainty in the category and quantity of failed satellites in a multiple configured satellite system. At the same time, a corresponding intelligent fault-tolerant system structure based on a cell-level fusion mode of operation was designed. Furthermore, a fault diagnosis strategy is proposed to deal with gradually or suddenly changing faults. By monitoring the residual and the residual rate, an observation quality gene is obtained using a fuzzy logic control system, and the local filter is adaptively adjusted on-line. Consequently, any filtering divergence arising from a gradually changing fault can, to a large extent, be prevented. The results show that the proposed algorithm and structure can achieve reliable positioning by fully utilizing new multiple satellites, monitoring and managing the gradual fault, as well as detecting and isolating any sudden fault in a synchronous manner. As such, the proposed algorithm has the potential to improve the reliability of a multiple satellite configured navigation system.

关键词： multiple satellite configured systems fuzzy logic control intelligent fault-tolerant filtering federated filtering fault detection and isolation

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Effect of an impurity on 3-electron quantum dots in magnetic fields

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Science china(Physics,Mechanics & Astronomy) 2004年第5期47卷 521-530页

作者： LIU Yimin1,2. HUANG Gangming1 & BAO Chengguang1 1. department of Physics, Zhongshan university, Guangzhou 5102.5,{2. 2. department of Physics, Shaoguan university, Shaoguan 512.05,{2. 1. department of Physics Zhongshan University 510275 Guangzhou China 2. department of Physics Shaoguan University 512005 Shaoguan China

The ground-state property of a 2.dimensional 3-electron quantum dot (QD) subjected to an external magnetic fieldB and affected by an impurity is studied. The impurity is located at thez-axis by a distanced from the plane of the dot. The evolution of the angular momentumL o and the spinS o of the ground state in accordance withB andd has been calculated, and the results are summarized and plotted in a (L o,S o) diagram. The spatial distribution of the electrons (the size and the geometric features) and the optical absorption have also been investigated. The (L o S o) diagram indicates thatL o andS o may jump whend and/orB vary. It was found that, due to the constraints arising from symmetry, each symmetric geometry is accessible only to a specific group of states having specificL o andS o.

关键词： quantum dot, ground state, charged impurity, magnetic field.

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A Novel CAPP System Based on SML for Variant Design of Process Planning

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武汉理工大学学报 2006年第S3期28卷 820-823页

作者： ZHAO Haibin~1 WANG Junying~1 ZHANG Min~2.(1.department of precision {2. & mechanology,tsinghua university,Beijing 100084,china, 2.department of Mechanical Equipment & Control Engineering,Beijing university of Science and Technology,Bejing 100083,china) department of precision {2. & mechanology Tsinghua UniversityBeijing 100084China department of Mechanical Equipment & Control Engineering Beijing University of Science and TechnologyBejing 100083 China

The production model of“multi-specification and low-quantity”is becoming the main trend of manufacturing *** a key activity in the manufacturing chain,traditional computer aided process planning(CAPP)system fails to adapt to the production model of ***,a novel method for variant design of process planning was proposed to develop CAPP system based on Tabular Layouts of Article Characteristics(Sach-Merk Leisten in German and SML for short). With the support of standard database of master process planning documents which are developed by parameterization technique, and instance process planning for special product(instance product)can be generated automatically by the sub-system of variant de- sign of process ***,a CAPP system was developed for process design of rotor of steam turbine to validate the feasibil- ity and applicability of the method.

关键词： CAPP variant design SML master process planning documents(DocMPP) parameterization

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THE EXISTENCE OF J-HOLOMORPHIC CURVES AND APPLICATIONS TO THE WEINSTEIN CONJECTURE

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Chinese Annals of Mathematics,Series B 1999年第4期20卷 425-434页

作者： MA RENYI(department of Applied Mathmatics, tsinghua university, Beijing {2., china) tsinghua Univ Dept Appl Math Beijing 100084 Peoples R China

The author first proves the existences of J-holomorphic curves in the symplectizations of Legendre fibrations and then as an application confirms the Weinstein conjectures on contact manifolds of Legendre fibrations. As a corollary a new proof on the theorem due to Hofer,Viterbo, Gluck, Ziller, Weinstein and Ljusternik-Fet Theorem is provided, which is quite different from their original proofs.

关键词： Symplectic geometry J-holomorphic curves Periodic orbit

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K-uniformly rotund spaces and k-uniformly smooth spaces

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Chinese Science Bulletin 1998年第2期43卷 92-95页

作者： Suyalatu 1 and WU Congxin 2.1. department of Mathematics,Inner Mongolia Normal university, Huhhot 01002.,{2. 2. department of Mathematics, Harbin Institute of Technology, Harbin 150006,{2. department of Mathematics Inner Mongolia Normal University Huhhot China department of Mathematics Harbin Institute of Technology Harbin China

The conception of k_uniform smoothness (KUS) is introduced. It is the extension of the conception of uniform smoothness. It is proved that the k_uniform smoothness and Sullivan’s K_uniform rotundity (KUR) are the daul notions. X+* is a KUR space if and only if X is a KUS space, X+* is a KUS space if and only if X is a KUR space. If X is a KUS space, then X is a (K+1)US space. It is also proved that the KUS space includes the Nan’s k_strongly smooth space.

关键词： K_uniform smoothness K_uniform convexity.

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RRM:An incentive reputation model for promoting good behaviors in distributed systems

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Science in china(Series F) 2008年第11期51卷 1871-1882页

作者： ZHANG Hong1,2.DUAN HaiXin1,3 & LIU Wu1,3 1 tsinghua National Laboratory for Information Science and Technology,tsinghua {2.,Beijing 100084,china 2.department of Computer Science and Technology,tsinghua {2.,Beijing 100084,china 3 Network Research Center,tsinghua {2.,Beijing 100084,china 1. tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing 100084 China 2. department of Computer Science and Technology Tsinghua University Beijing 100084 China 3. Network Research Center Tsinghua University Beijing 100084 China

Reputation systems represent soft security mechanisms that complement traditional information security mechanisms. They are now widely used in online e-commerce markets and communities in order to stimulate good behaviors as well as to restrain adverse behaviors. This paper analyzes the limitations of the conversational reputation models and proposes an incentive reputation model called the resilient reputation model （RRM） for the distributed reputation systems. The objective of this reputation model is not only to encourage the users to provide good services and, therefore, to maximize the probability of good transaction outcomes, but also to punish those adverse users who are trying to manipulate the application systems. The simulation results indicate that the proposed reputation model （RRM） could effectively resist against the common adverse behaviors, while protecting the profits of sincere users from being blemished by those adversaries.

关键词： reputation model distributed system trust soft security

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NEURO-FUZZY NETWORKS IN CAPP

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Chinese Journal of Mechanical Engineering 2000年第1期13卷 30-34页

作者： Bernard S Maiyo Wang Xiankui Lin Chengying (department of precision {2. and mechanology, Qinghua university) 清华大学北京

The neuro-fuzzy network (NFN) is used to model the rules and experience of the process planner. NFN is to select the manufacturing operations sequences for the part features. A detailed description of the NFN system development is given. The rule structure utilizes sigmoid functions to fuzzify the inputs, multiplication to combine the if Part of the rules and summation to integrate the fired rules. Expert knowledge from previous process Plans is used in determinning the initial network structure and parameters of the membership functions. A back-propagation (BP) training algorithm was developed to fine tune the knowledge to company standards using the input-output data from executions of previous plans. The method is illustrated by an industrial example.

关键词： Neuro-fuzzy networks Training Semi-generative systems CAPP

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Anisotropic effect on the vibronic reduction factors

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Chinese Science Bulletin 2006年第21期51卷 2553-2558页

作者： QIU Qing-chun1,2.& QIAO Fen1,2.1. department of Physics and IT, Medical College, Shantou university,Shantou 515041,{2. 2. department of Physics, Shantou university, Shantou 515063,{2. department of Physics and IT Medical College Shantou University Shantou 515041 China department of Physics Shantou University Shantou 515063 China

The reduction factors p and q defined by Ham in the Ee JT system and their relation 2.-p=1 have been well accepted and the concept of reduction factors is widely used in the studies of vibronic coupling. However, when the system is under the anisotropic conditions, the reduction factors and their relation will change accordingly. The first-order reduction factors p and q of Ee system were further studied using the method of unitary transformation here. The relation between p and q proposed by Ham was investigated under both conditions of the linear coupling and the anisotropic effects. The result demonstrated that the relation of 2.-p=1 was only correct for the linear vibronic coupling, but not correct when the anisotropic effect was considered. This result suggested that the anisotropic effect influence considerably the reduction factors, and hence the physical properties of materials. Our method could be also applied to other JT systems, especially the highly symmetric JT systems involving C60 molecules.

关键词：电子振动耦合声子交迭 Jahn-Teller效应各向异性

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A　new　approach　for　realizing　the　optical　morphological　dilation　of　1－D　gray　images

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Chinese Journal of Lasers 1994年第5期B3卷 455-461页

作者： HUANG Guoliang JIN Guofan WU Minxian YAN Yingbai(Dept.o,precision instruments,{2. university,Beijing 100084,china) tsinghua Univ Beijing China

Ａｎｅｗａｐｐｒｏａｃｈｆｏｒｒｅａｌｉｚｉｎｇｔｈｅｏｐｔｉｃａｌｍｏｒｐｈｏｌｏｇｉｃａｌｄｉｌａｔｉｏｎｏｆ１－ＤｇｒａｙｉｍａｇｅｓＨＵＡＮＧＧｕｏｌｉａｎｇ；ＪＩＮＧｕｏｆａｎ；ＷＵＭｉｎｘｉａｎ；ＹＡＮＹ... 详细信息

Ａｎｅｗａｐｐｒｏａｃｈｆｏｒｒｅａｌｉｚｉｎｇｔｈｅｏｐｔｉｃａｌｍｏｒｐｈｏｌｏｇｉｃａｌｄｉｌａｔｉｏｎｏｆ１－ＤｇｒａｙｉｍａｇｅｓＨＵＡＮＧＧｕｏｌｉａｎｇ；ＪＩＮＧｕｏｆａｎ；ＷＵＭｉｎｘｉａｎ；ＹＡＮＹｉｎｇｂａｉ（Ｄｅｐｔ．ｏ，Ｐｒｅ...

关键词： mathematical morphology digital umbra shading and shadowing algoRithm

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Transitional function of DG to CA3 in the hippocampus

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Progress in Natural Science:Materials International 2007年第12期17卷 1436-1444页

作者： Yan Chuankui1 and Liu Shenquan2.1. department of Mathematics, Hangzhou Normal university, Hangzhou 310036,{2. 2. department of Applied Mathematics, School of Mathematical Sciences, South{2. university of Technology, Guangzhou 510640,{2.) department of Mathematics Hangzhou Normal University Hangzhou 310036 China department of Applied Mathematics School of Mathematical Sciences South China University of Technology Guangzhou 510640 China

Using single cell channel model, the transmission features of CA3-DG network in the hippocampus are investigated. The influence of the stimulation on discharge pattern of pyramidal neurons is analyzed, which shows that it starts with period spiking discharges, followed by period-doubling bifurcation to chaos, and period 3 discharge evolving into chaos, and ultimately a period of bursting discharges. By the synaptic model, the CA3-DG network model is constructed, which analyzes the summation of postsynaptic currents in the network, the influence of postsynaptic current on discharge rhythm as well as the mechanism of bursting discharges. The strong capacity of spatiotemporal encoding in the network indicates the features of CA3 network during the information transmission process in the hippocampus. The modeling result with time delay of the synaptic transmission is in accordance with the experimental phenomena of action potential in the hippocampus.

关键词： hippocampus CA3-DG period-doubling bifurcation chaos.

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