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Tsinghua Science and Technology

Issue 4 • Date Aug. 2006

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Displaying Results 1 - 18 of 18
  • [Front cover]

    Publication Year: 2006, Page(s): c1
    IEEE is not the copyright holder of this material | PDF file iconPDF (383 KB)
    Freely Available from IEEE
  • Contents

    Publication Year: 2006, Page(s): 1
    IEEE is not the copyright holder of this material | PDF file iconPDF (78 KB)
    Freely Available from IEEE
  • INFORMATION SCIENCE AND TECHNOLOGY 
  • Transmit antenna selection with power and rate allocation for spatial multiplexing in distributed antenna systems

    Publication Year: 2006, Page(s):259 - 263
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    High spectral efficiency distributed antenna systems (DAS) require vertical Bell-Labs layered space-time (V-BLAST) like spatial multiplexing schemes. However, unlike normal point-to-point multiple input multiple output (MIMO) channels, DAS channels have different large-scale fadings from different transmit antennas, thus making equal power and rate transmission that is feasible in MIMO channels un... View full abstract»

    Open Access
  • Two normal basis multiplication algorithms for GF(2n)

    Publication Year: 2006, Page(s):264 - 270
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (336 KB)

    For software implementations, word-level normal basis multiplication algorithms utilize the full data-path of the processor, and hence are more efficient than the bit-level multiplication algorithm presented in the IEEE standard P1363–2000. In this paper, two word-level normal basis multiplication algorithms are proposed for GF(2n). The first algorithm is suitable for high comple... View full abstract»

    Open Access
  • Analytical expression for the MIMO channel capacity

    Publication Year: 2006, Page(s):271 - 277
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (327 KB)

    This paper presents analytical expressions for the multiple-input multiple-output (MIMO) channel capacity in frequency-flat Rayleigh fading environments. An exact analytical expression is given for the ergodic capacity for single-input multiple-output (SIMO) channels. The analysis shows that the SIMO channel capacity can be approximated by a Gaussian random variable and that the MIMO channel capac... View full abstract»

    Open Access
  • Adaptive delayed acknowledgement algorithm for mpeg-4 traffic in uwb networks

    Publication Year: 2006, Page(s):278 - 286
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (259 KB)

    Although ultra-wideband transmission rates are very high in the physical layer, the bandwidth utilization efficiency is very low in the medium access control (MAC) layer. The bandwidth utilization efficiency can be improved and the quality of service for delay-sensitive variable bit rate traffic such as high rate motion picture experts group (MPEG)-4 traffic can be guaranteed by a simple and effic... View full abstract»

    Open Access
  • Networked Control System Simulation Design and Its Application

    Publication Year: 2006, Page(s):287 - 294
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (271 KB)

    This paper presents a framework for networked control system simulation (NCSS) to enable the analysis of the influence of network transmissions on the performance of control systems. The simulation is composed of the network environment simulated using the network simulator, the control system component simulation using Matlab or C/C++, and an external application programming interfa... View full abstract»

    Open Access
  • Machine translation using constraint-based synchronous grammar

    Publication Year: 2006, Page(s):295 - 306
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (381 KB)

    A synchronous grammar based on the formalism of context-free grammar was developed by generalizing the first component of production that models the source text. Unlike other synchronous grammars, the grammar allows multiple target productions to be associated to a single production rule which can be used to guide a parser to infer different possible translational equivalences for a recognized inp... View full abstract»

    Open Access
  • MW-obs: An improved pruning method for topology design of neural networks

    Publication Year: 2006, Page(s):307 - 312
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    Topology design of artificial neural networks (ANNs) is an important problem for large scale applications. This paper describes a new efficient pruning method, the multi-weight optimal brain surgeon (MWOBS) method, to optimize neural network topologies. The advantages and disadvantages of the OBS and unit-OBS were analyzed to develop the method. Actually, optimized topologies are difficult to get ... View full abstract»

    Open Access
  • CIVIL AND HYDRAULIC ENGINEERING 
  • Transient flow in rapidly filling air-entrapped pipelines with moving boundaries

    Publication Year: 2006, Page(s):313 - 323
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (418 KB)

    A mathematical model is presented for transient flow in a rapidly filling pipeline with an entrapped air pocket. The influence of transient shear stress between the pipe wall and the flowing fluid is taken into account. A coordinate transformation technique is employed to generate adaptive moving meshes for the multiphase flow system as images of the time-independent computational meshes in auxili... View full abstract»

    Open Access
  • Application of method-of-lines to charging-up process in pipelines with entrapped air

    Publication Year: 2006, Page(s):324 - 331
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (361 KB)

    A mathematical model is presented for the charging-up process in an air-entrapped pipeline with moving boundary conditions. A coordinate transformation technique is employed to reduce fluid motion in time-dependent domains to ones in time-independent domains. The nonlinear hyperbolic partial differential equations governing the unsteady motion of fluid combined with an equation for transient shear... View full abstract»

    Open Access
  • Wave damping over a perforated plate with water chambers

    Publication Year: 2006, Page(s):332 - 338
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (277 KB)

    The movement of waves propagating over a horizontally submerged perforated plate with water-filled chambers bellow the plate was investigated by using linear potential theory. The analytical solution was compared with laboratory experiments on wave blocking. The analysis of the wave energy dissipation on the perforated bottom surface shows that the effects of the perforated plate on the wave motio... View full abstract»

    Open Access
  • Socio-economic impact assessment of intelligent transport systems

    Publication Year: 2006, Page(s):339 - 350
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (293 KB)

    A general review of the socio-economic impact of the intelligent transport system (ITS) is presented with a case study to demonstrate the data envelopment analysis method. Cost-benefit analyses are still the dominant method for evaluating ITS and other transport engineering projects, while cost effective analyses and multi-criteria appraisals are widely used to define and prioritize objectives by ... View full abstract»

    Open Access
  • Disaggregate traffic mode choice model based on combination of revealed and stated preference data

    Publication Year: 2006, Page(s):351 - 356
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    The conventional traffic demand forecasting methods based on revealed preference (RP) data are not able to predict the modal split. Passengers' stated intentions are indispensable for modal split forecasting and evaluation of new traffic modes. This paper analyzed the biases and errors included in stated preference data, put forward the new stochastic utility functions, and proposed an unbiased di... View full abstract»

    Open Access
  • Credit assessment of contractors: A rough set method

    Publication Year: 2006, Page(s):357 - 362
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (219 KB)

    A rough set method is presented in this paper to assess the credit of contractors. Unlike traditional methods, the rough set method deduces credit-classifying rules from actual data to predict new cases. The method uses a contractors' database with a genetic algorithm and an exhaustive reduction implemented using ROSETTA software that integrates rough set method. The classification accuracy of the... View full abstract»

    Open Access
  • CHEMICAL ENGINEERING 
  • Effect of methyl jasmonic acid on baccatin III biosynthesis

    Publication Year: 2006, Page(s):363 - 367
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (369 KB)

    As baccatin III is an immediate diterpenoid precursor of taxol, the increase of baccatin III is beneficial to the biosynthesis of taxol. Addition of methyl jasmonic acid (MJ) enhances the activity of 10-deaceyle baccatin (DAB) III acetyl transferase which catalyzes the bioconversion from 10-DAB III to beccatin III. In this paper, the baccatin III content was increased by 174% by the addition of 10... View full abstract»

    Open Access
  • Isothermal kinetics of the pentlandite exsolution from mss/pyrrhotite using model-free method

    Publication Year: 2006, Page(s):368 - 373
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (343 KB)

    The pentlandite exsolution from monosulfide solid solution (mss)/pyrrhotite exsolution is a complex multi-step process, including nucleation, new phase growth and atomic diffusion, and lamellae coarsening. Some of these steps occur in sequence, others simultaneously. These make its kinetic analysis difficult, as the mechanisms cannot be elucidated in detail. In mineral reactions of this type, the ... View full abstract»

    Open Access
  • Ultrasonic enhancement of industrial sludge settling ability and dewatering ability

    Publication Year: 2006, Page(s):374 - 378
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB)

    This paper investigates the treatment of chromium (Cr) contaminated industrial sludge from a tanning process with ultrasound to enhance the sludge settling ability and dewatering ability. Ultrasound at various frequencies, intensities, and time was tested to optimize the operation. The results show that treatment with 30 kHz, 12 W/L ultrasound for 120 s shortened the sludge settling time from 3 h ... 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