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Tsinghua Science and Technology

Issue 1 • Date Feb. 2007

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Displaying Results 1 - 19 of 19
  • [Front cover]

    Publication Year: 2007, Page(s): c1
    IEEE is not the copyright holder of this material | PDF file iconPDF (184 KB)
    Freely Available from IEEE
  • Contents

    Publication Year: 2007, Page(s): 1
    IEEE is not the copyright holder of this material | PDF file iconPDF (73 KB)
    Freely Available from IEEE
  • Personalized service system based on hybrid filtering for digital library

    Publication Year: 2007, Page(s):1 - 8
    Cited by:  Papers (19)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (327 KB)

    Personalized service systems are an effective way to help users obtain recommendations for unseen items, within the enormous volume of information available based on their preferences. The most commonly used personalized service system methods are collaborative filtering, content-based filtering, and hybrid filtering. Unfortunately, each method has its drawbacks. This paper proposes a new method w... View full abstract»

    Open Access
  • Algorithmic study of for multi-function sensor data reconstruction

    Publication Year: 2007, Page(s):9 - 13
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (335 KB)

    This paper describes a data reconstruction technique for a multi-function sensor based on the Mestimator, which uses least squares and weighted least squares method. The algorithm has better robustness than conventional least squares which can amplify the errors of inaccurate data. The M-estimator places particular emphasis on reducing the effects of large data errors, which are further overcome b... View full abstract»

    Open Access
  • Robust adaptive neural control of a class of nonlinear systems

    Publication Year: 2007, Page(s):14 - 21
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (449 KB)

    In this paper we present a robust adaptive control for a class of uncertain continuous time multiple input multiple output (MIMO) nonlinear systems. Multiple multi-layer neural networks are employed to approximate the uncertainty of the nonlinear functions, and robustifying control terms are used to compensate for approximation errors. All parameter adaptive laws and robustifying control terms are... View full abstract»

    Open Access
  • A low complexity and high efficient method for image compression with bayer CFAs

    Publication Year: 2007, Page(s):22 - 29
    Cited by:  Papers (5)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    This paper presents a novel method of lossy image compression for digital colorful image sensors with Bayer color filter arrays (CFAs) based on an analysis of existing compression-first methods. An improved compression and decompression structure is described. The captured CFA raw data are firstly lowpass filtered in RGB space by a smooth filter followed by a down-sampling operation. Next, the dat... View full abstract»

    Open Access
  • SDG-based hazop and fault diagnosis analysis to the inversion of synthetic ammonia

    Publication Year: 2007, Page(s):30 - 37
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (354 KB)

    This paper presents some practical applications of signed directed graphs (SDGs) to computeraided hazard and operability study (HAZOP) and fault diagnosis, based on an analysis of the SDG theory. The SDG is modeled for the inversion of synthetic ammonia, which is highly dangerous in process industry, and HAZOP and fault diagnosis based on the SDG model are presented. A new reasoning method, whereb... View full abstract»

    Open Access
  • Convergence of recursive identification for ARMAX process with increasing variances

    Publication Year: 2007, Page(s):38 - 43
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (345 KB)

    The autoregressive moving average exogenous (ARMAX) model is commonly adopted for describing linear stochastic systems driven by colored noise. The model is a finite mixture with the ARMA component and external inputs. In this paper we focus on a parameter estimate of the ARMAX model. Classical modeling methods are usually based on the assumption that the driven noise in the moving average (MA) pa... View full abstract»

    Open Access
  • Estimating illumination parameters using spherical harmonics coefficients in frequency space

    Publication Year: 2007, Page(s):44 - 50
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (864 KB)

    An algorithm is presented for estimating the direction and strength of point light with the strength of ambient illumination. Existing approaches evaluate these illumination parameters directly in the high dimensional image space, while we estimate the parameters in two steps: first by projecting the image to an orthogonal linear subspace based on spherical harmonic basis functions and then by cal... View full abstract»

    Open Access
  • Personalized multi-view face animation with lifelike textures

    Publication Year: 2007, Page(s):51 - 57
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (447 KB)

    Realistic personalized face animation mainly depends on a picture-perfect appearance and natural head rotation. This paper describes a face model for generation of novel view facial textures with various realistic expressions and poses. The model is achieved from corpora of a talking person using machine learning techniques. In face modeling, the facial texture variation is expressed by a multi-vi... View full abstract»

    Open Access
  • Fast fractal image encoding based on special image features

    Publication Year: 2007, Page(s):58 - 62
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (419 KB)

    The fractal image encoding method has received much attention for its many advantages over other methods, such as high decoding quality at high compression ratios. However, because every range block must be compared to all domain blocks in the codebook to find the best-matched one during the coding procedure, baseline fractal coding (BFC) is quite time consuming. To speed up fractal coding, a new ... View full abstract»

    Open Access
  • FIDER: A force-balance-based interconnect delay driven re-synthesis algorithm for data-path optimization after floorplan

    Publication Year: 2007, Page(s):63 - 69
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (307 KB)

    As the feature size of integrated circuits is reduced to the deep sub-micron level or the nanometer level, the interconnect delay is becoming more and more important in determining the total delay of a circuit. Re-synthesis after floorplan is expected to be very helpful for reducing the interconnect delay of a circuit. In this paper, a force-balance-based re-synthesis algorithm for interconnect de... View full abstract»

    Open Access
  • Performance analysis of two ethernet over el schemes

    Publication Year: 2007, Page(s):70 - 76
    Cited by:  Papers (1)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (287 KB)

    The Ethernet over E1 approach, which takes advantage of widely deployed telecom networks, is an efficient and economical way to interconnect two Ethernets in different regions. Two Ethernet over E 1 schemes, namely a byte granularity scheme and a frame granularity scheme are discussed. The byte granularity scheme partitions Ethernet frames into several pieces for transmission and has a strict requ... View full abstract»

    Open Access
  • On-chip network design automation with source routing switches

    Publication Year: 2007, Page(s):77 - 85
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (517 KB)

    Network-on-chip (NoC) is a new design paradigm for system-on-chip intraconnections in the billion-transistor era. Application specific on-chip network design is essential for NoC success in this new era. This paper presents a class of source routing switches that can be used to efficiently form arbitrary network topologies and that can be optimized for various applications. Hardware description la... View full abstract»

    Open Access
  • Efficient multiple description scalable video coding scheme based on weighted signal combinations

    Publication Year: 2007, Page(s):86 - 90
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (235 KB)

    A simple, efficient multiple description coding (MDC) algorithm was developed based on weighted signal combinations. The scheme uses the standard video encoder with a pre-processing stage to generate multiple descriptions. The decoder then uses a post-processing algorithm to combine the descriptions to provide better image quality. A scalable codec in the MDC system allows the system to provide mu... View full abstract»

    Open Access
  • Fuzzy economic order quantity inventory models without backordering

    Publication Year: 2007, Page(s):91 - 96
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (291 KB)

    In economic order quantity models without backordering, both the stock cost of each unit quantity and the order cost of each cycle are characterized as independent fuzzy variables rather than fuzzy numbers as in previous studies. Based on an expected value criterion or a credibility criterion, a fuzzy expected value model and a fuzzy dependent chance programming (DCP) model are constructed. The pu... View full abstract»

    Open Access
  • Polarimetric synthetic aperture radar image classification by a hybrid method

    Publication Year: 2007, Page(s):97 - 104
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (517 KB)

    Different methods proposed so far for accurate classification of land cover types in polarimetric synthetic aperture radar (SAR) image are data specific and no general method is available. A novel hybrid framework for this classification was developed in this work. A set of effective features derived from the coherence matrix of polarimetric SAR data was proposed. Constituents of the feature set a... View full abstract»

    Open Access
  • Discrete time optimal adaptive control for linear stochastic systems

    Publication Year: 2007, Page(s):105 - 110
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (327 KB)

    The least-squares (LS) algorithm has been used for system modeling for a long time. Without any excitation conditions, only the convergence rate of the common LS algorithm can be obtained. This paper analyzed the weighted least-squares (WLS) algorithm and described the good properties of the WLS algorithm. The WLS algorithm was then used for adaptive control of linear stochastic systems to show th... View full abstract»

    Open Access
  • Spatial compatible user evaluation algorithm for space division multiplexing broadcast channels

    Publication Year: 2007, Page(s):111 - 114
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (243 KB)

    Cochannel interference introduced by frequency reuse under space division multiple access can be reduced by controlling the frequency sharing according to the users' spatial separability. The system avoids placing highly correlated users in space into the same spatial multiplexing group. This paper describes a user spatial compatibility evaluation criterion based on channel matrix structure analys... View full abstract»

    Open Access

Aims & Scope

Tsinghua Science and Technology (Tsinghua Sci Technol) aims to highlight scientific achievements in computer science, electronic engineering, and other IT fields. Contributions all over the world are welcome.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Professor Jiaguang Sun
School of Software
Tsinghua University
Beijing  100084 China
journal@tsinghua.edu.cn
Phone:86-10-62771385