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Systems Engineering and Electronics, Journal of

Issue 1 • Date March 2003

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Displaying Results 1 - 20 of 20
  • [Front cover]

    Page(s): c1
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    Freely Available from IEEE
  • Copyright page

    Page(s): 1
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  • Contents

    Page(s): 1
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  • Study on cell error rate of a satellite ATM system based on CDMA

    Page(s): 1 - 5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1025 KB)  

    In this paper, the cell error rate (CER) of a CDMA-based satellite ATM system is analyzed. Two fading models, i.e. the partial fading model and the total fading model are presented according to multi-path propagation fading and shadow effect. Based on the total shadow model, the relation of CER vs. the number of subscribers at various elevations under 2D-RAKE receiving and non-diversity receiving is got. The impact on cell error rate with pseudo noise (PN) code length is also considered. The result that the maximum likelihood combination of multi-path signal would not improve the system performance when multiple access interference (MAI) is small, on the contrary the performance may be even worse is abtained. View full abstract»

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  • Cooperative mechanism of supply chain under asymmetric information

    Page(s): 6 - 11
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1559 KB)  

    The cooperative mechanism is one main issue in the decentralized supply chain system, especially in an asymmetric information structure. We analyze the non-cooperative game behavior of a 2-echelon distribution supply chain, compare the results with the system optimal solution, and give the supplier dominated cooperative mechanisms. We also analyze the validity of our contract under the asymmetric retailers' holding cost information and give some useful conclusions. View full abstract»

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  • The synthetic evaluation of warhead overall efficiency

    Page(s): 12 - 17
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1133 KB)  

    The evaluation system of smart ammunirron warhead overall efficiency has been established in this paper. All kinds of evaluation methods have been analyzed. Having led the concept of hierarchical structure into technique for order preference by similarity to ideal solution (TOPSIS) method, we put forward the step TOPSIS method which is suitable for evaluating the overall efficiency of smart ammunition warheads. In the calculation of index weight, the graded weight calculus is put forward which hardly relies on the subjectivity of decision-makers and can reflect the sensitivity and compatibility of the index. In the graded weight calculation, the proportional-arithmetic weight value calculus and sensitivity-compatibility weight value calculus are given respectively. View full abstract»

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  • Probability criterion for a dynamic financial model with short-selling allowed

    Page(s): 18 - 23
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1164 KB)  

    Probability criterion has its practical significance, and its investment decision-making is determined by the expected discounted wealth. In a complete, standard financial market with short-selling allowed, this paper probes into the investment decision-making with probability criterion. The upper limit of criterion function is obtained. The corresponding discounted wealth process and hedging portfolio process are provided. Finally, an illustrative example of one-dimensional constant-coefficient financial market is given. View full abstract»

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  • A study on system availability vs system administration efforts with mathematical models

    Page(s): 24 - 29
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    Two mathematical models are developed in this paper to study effectiveness system administration efforts on improvement system availability, based the assumption that there exists transitional state for a computer system in operation before it is brought down by some hardware or software problems and with intensified system administration efforts, it is to discover and fix the problems in time to bring the system back normal state before it is down Markov chain is used to simulate the transition of system states. A conclusion is made that increasing system administration efforts may be a cost-effective way to meet requirements for improvement on system availability, but higher demand on this aspect still has to be met by advanced technologies. View full abstract»

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  • Agile supply chain reengineering based on multi-objective global performance measurement

    Page(s): 30 - 35
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1733 KB)  

    The process and related technology of agile supply chain reengineering is discussed in this paper. The process of supply chain reengineering is divided into two parts here: structure reengineering and operation strategy reengineering, Multi-agent concept is adopted in the structure reengineering for the convenience of the modeling. Enterprises in the agile supply chain are expressed as corresponding agents with specified characteristics. Cost and response time are adopted as the main objectives of the global supply chain performance measurement. A virtual simplified supply chain is used to illustrate the role of overall supply chain performance measurement in the reengineering process. View full abstract»

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  • A target recognition approach to projecting HRR profiles onto subspace

    Page(s): 36 - 40
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1012 KB)  

    A array of the azimuthally averaged range-profile vectors and the inter-class and intra-class divergence matrixes are constructed with many frames of the high resolution range profiles which result from radar echoes of airplanes. Taking the methods of whitening transformation and SVD produces a system of subspace vectors for target recognition. Where upon. a template library for target recognition is built by the projection of a class-mean vector made from the radar data onto the subspace for recognition. By Euclidean distance, a comparison is made between the above projection and each template in the library, to decide which class the target belongs to. Finally, simulations with the experimental radar data arte given to show that the proposed method is robust to variation in azimuth and immune to additive Gaussian noise when SNR ≥ 5dB. View full abstract»

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  • Air target fuzzy pattern recognition Threat-judgment model

    Page(s): 41 - 46
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1116 KB)  

    Threat-judgment is a complicated fuzzy inference problem. Up to now no relevant unified theory and measuring standard have been developed. It is very difficult to establish Threat-judgment model with high reliability in the air defense system for the naval warships Air target threat level judgment is an important component in naval warship combat command decision-making systems. According to the threat level judgment of air targets during the air defense of single naval warship, a fuzzy pattern recognition model for judging the threat from air targets is established. Then an algorithm for identifying the parameters in the model is presented. The model has an adaptive feature and can dynamically update its parameters according to the state change of the targets and the environment The method presented here can be used for the air defense system threat judgment in the naval warships. View full abstract»

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  • An evolutionary real-time 3D route planner for aircraft

    Page(s): 47 - 53
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2637 KB)  

    A novel evolutionary route planner for aircraft is proposed in this paper. In the new planner. individual candidates are evaluated with respect to the workspace, thus the computation of the configuration space is not required. By using problem-specific chromosome structure and genetic operators, the routes are generated in real time, with different mission constraints such as minimum route leg length and flying altitude, maximum turning angle, maximum climbing/diving angle and route distance constraint taken into account. View full abstract»

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  • Adaptive endpoint detection based on subband speech

    Page(s): 54 - 57
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (716 KB)  

    An adaptive endpoint detection algorithm based on band energy and adaptive smoothing algorithm is described. This algorithm utilizes the capability of adaptive smoothing algorithm that intensifies the discontinuity between local areas. The band energy features are selected because of their usefulness in detecting high energy regions (in the incoming signal) and making the distinction between speech and noise. Heuristic “edge-focusing” is used to endpoint detection to save the time in iteration. View full abstract»

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  • Neuromorphic continuous-time state space pole placement adaptive control

    Page(s): 58 - 62
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1079 KB)  

    A neuromorphic continuous-time state space pole assignment adaptive conrroller is proposed, which is particularly appropriate for controlling a large-scale time-variant state-space model due to the parallely distributed nature of neurocomputing. In our approach, Hopfield neural network is exploited to identify the parameters of a continuous-time state-space model, and a dedicated recurrent neural network is designed to compute pole placement feedback control law in real time. Thus the identification and the control computation are incorporated in the closed-loop, adaptive, real-time control system. The merit of this approach is that the neural networks converge to their solutions very quickly and simultaneously. View full abstract»

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  • Relay feedback based autotuning PID control of paper basis weight in paper making process

    Page(s): 63 - 69
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1232 KB)  

    The brief arts crafts of the ordinary fourdrinier are introduced first. After the intractable points of paper basis weight (BW) control are analyzed, an autotuning PID/PI control algorithm based on relay feedback identification is proposed, which has such advantages as simple parameter adjustment, little dependence on process model, strong robustness and easiness to implementation. And it is very suitable for controlling such processes as BW loop with large time delay. View full abstract»

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  • Non-minimum phase nonlinear system predictive control based on local recurrent neural networks

    Page(s): 70 - 73
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (745 KB)  

    After a recursive multi-step-ahead predictor for nonlinear systems based on local recurrent neural networks is introduced, an intelligent PID controller is adopted to correct the errors including identified model errors and accurnulatec errors produced in the recursive process. Characterized by predictive control, this method can achieve a good control accuracy and has good robustness. A simulation study shows that this control algorithm is very effective. View full abstract»

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  • The optimal control for the output feedback stochastic system at the risk-sensitive cost

    Page(s): 74 - 80
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    The optimal control of the partially observable stochastic system at the risk-sensitive cost is considered in this paper. The system dynamics has a general correlation between system and measurement noise. And the risk-sensitive cost contains a general quadratic term (with cross terms and extra linear terms). The explicit solution of such a problem is presented here using the output feedback control method. This dean and direct derivation enables one to convert such partial observable problems into the equivalent complete observable control problems and use the routine ways to solve them. View full abstract»

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  • Study on high-speed magnitude approximation for complex vectors

    Page(s): 81 - 85
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    High-speed magnitude approximation algorithms for complex vectors are discussed intensively. The performance and the convergence speed of these approximation algorithms are analyzed. For the polygon fitting algorithms, the approximation formula under the least mean square error criterion is derived. For the iterative algorithms, a modified CORDIC (coordinate rotation digital computer) algorithm is developed. This modified CORDIe algorithm is proved to be with a maximum relative error about one half that of the original CORDIC algorithm. Finally, the effects of the finite register length on these algorithms are also concerned, which shows that 9 to 12-bit coefficients are sufficient for practical applications. View full abstract»

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  • Iterative multiuser receiver based on decorrelating decision-feedback detection

    Page(s): 86 - 91
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1162 KB)  

    Iterative multiuser receiver for joint multiuser detection and channel decoding improves the receiver's performance by passing soft information between multiuser detection and channel decoding In this paper. an iterative multiuser receiver based on decorrelating decision-feedback detection is proposed, which is effective to implement multiuser detection, channel decoding and parameter estimarion. The dena decoding and the parameter estimation are reinforced each other. The bit error rate decreases along with the increase of the iteration, and the parameter estimation approaches the optimum at the same time. View full abstract»

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  • Simulation for CCSDS advanced orbiting system (AOS) with BONeS designer

    Page(s): 92 - 96
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (644 KB)  

    This paper describes the modeling and simulation of the protocol of CCSDS advanced orbiting systems (AOS). The network features modeled in the implementation of CCSDS AOS are to multiplex different kinds of sources into virtual channel data units (VCDUs) in the data processing module The emphasis of this work is placed on the algorithm for com mutating VCDUs into physical channels in the form of continuous data stream. The objectives of modeling CCSDS AOS protocol are to analyze the performance of this protocol when it is used to process various data. View full abstract»

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Aims & Scope

Journal of Systems Engineering and Electronics reports the latest developments and achievements in both theoretical and practical aspects of systems engineering, electronics and related research areas.

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Editor-in-Chief
Professor Rong Shi
Journal of Systems Engineering and Electronics