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MODELING OF THE PRIORITY SCHEDULING INPUT-LINE GROUP OUTPUT WITH MULTI-CHANNEL IN ATM EXCHANGE SYSTEM

Journal of Electronics(China) 2006年第3期23卷 404-409页

作者： Lu Zhaoyi Lv Lei Lu Mai Information Engineering College Qingdao University Qingdao 266071 China International Business College Qingdao University Qingdao 266071 China Key Lab. of Opto-electronic and Intelligent Control Ministry of Education Lanzhou Jiaotong University Lanzhou 730070 China

In this paper, an extended Kendall model for the priority scheduling input-line group output with multi-channel in Asynchronous Transfer Mode （ATM） exchange system is proposed and then the mean method is used to model mathematically the non-typical non-anticipative PRiority service （PR） model. Compared with the typical and non-anticipative PR model, it expresses the characteristics of the priority scheduling input-line group output with multi-channel in ATM exchange system. The simulation experiment shows that this model can improve the HOL block and the performance of input-queued ATM switch network dramatically. This model has a better developing prospect in ATM exchange system.

关键词： Asynchronous Transfer Mode （ATM） network Priority Modeling research

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Research on characteristics of wood pyrolysis and gasification in fluidized beds

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Taiyangneng Xuebao/Acta Energiae Solaris Sinica 2006年第7期27卷 639-646页

作者： Xiao, Gang Chi, Yong Ni, Mingjiang Zhang, Jiaquan Miao, Qi Zhu, Wenli Zheng, Jiao Tu, Hongbin Cen, Kefa Clean Energy and Environment Engineering Key Lab. of Ministry Education College of Mechanical and Energy Engineering Zhejiang University Hangzhou 310027 China

Wood widely existed in municipal solid waste (MSW) was pyrolyzed and gasified in fluidized beds to research its reactive characteristics and mechanism. Products from pyrolysis and gasification was analyzed at different excessive air ratio (0-0.8) or temperature (400∼700°C) in fluidized beds. Optimal tar product from fluidized bed pyrolysis furnace with the yield about 38% of feedstock was obtained as temperature of 500°C. Wood gasification in fluidized beds is most suitable at temperature of 600°C and excess air ratio of 0.4. Under this condition, the efficiency of gasification is about 73%, LHV of syngas is about 5800 kJ/Nm3 and its yield is about 2.01 Nm3/kg. Then mechanisms of pyrolysis and gasification are proposed. It is expected to provide some basic data and reference for MSW/wood gasification.

关键词： Wood

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Signalling layout for fixed-block railway lines with real-coded genetic algorithms

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HKIE Transactions Hong Kong Institution of Engineers 2006年第1期13卷 35-40页

作者： Baohau, Mao Jianfeng, Liu Yong, Ding Haidong, Liu Kin, Ho Tin School of Traffic and Transportation Beijing Jiaotong University China Key Lab. of Intelligent Techniques and Systems for Traffic and Transport Systems Beijing Jiaotong University China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China Railway Society China Beijing Traffic Engineering Society China ASCE IEE Hong Kong IEEE Hong Kong IEAust Australia Key Lab. of Intelligent Techniques and Systems for Traffic and Transport Systems Ministry of Education Beijing Jiaotong University China

Signalling layout design is one of the keys to railway operations with fixed-block signalling system and it also carries direct effect on overall train efficiency and safety. Based on an analysis to system objectives, this paper presents an optimisation model with two objectives in order to devise an efficient signalling layout scheme. Taking into account the present railway line design practices in China, the paper describes steps of the computer-based signalling layout optimisation with real-coded genetic algorithms. A computer-aided system, based on train movement simulator, has also been employed to assist the optimisation process. A case study on a practical railway line has been conducted to make comparisons between the proposed GA-based approach and the current practices. The results illustrate the improved performance of the proposed approach in reducing signal block joints and shortening minimum train service headway.

关键词： Railroad transportation

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Synthesis of Fluoridated Hydroxyapatite Containing Potassium and Its Effect on Dentin

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Journal of Wuhan University of Technology(Materials Science) 2005年第B12期20卷 38-40页

作者：李箐廖运贸 Key Lab. for Oral Biomedical Engineering Ministry of Education Sichuan University Chengdu 610041 China

The aim of this work was to produce a nanoscale fluoridated and potassium containing hydroxyapatite via sol-gel method and to observe the effect of occlusion of the dentin tubule under scanning electron microscopy. HF was selected as fluorine-containing rengent which was added into mixed Ca （ NO3 ）2-P2O5 ethanol solutions to obtain dipping sols. All of the resulting samples showed apatite structure in their X- ray diffraction pattern. The lattice parameter a and the crystallite size were calculated to demonstrate the crystalline structure of fluoridated and potassium containing HA. Extracted paired premolars were chosen to obtain a fiat surface with opened tubules. It was observed that the tubules were covered by a 10 μm layer of fluoridated and potassium containing HA under the SEM. As the experimental results show the nanoscale fluoridated and potassium containing hydroxyapatite occludes the dentin tubules.

关键词： sol-gel fluoridate hydroxyapatite potassium dentin

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Identification and Isolation of Human Dental Pulp Stem Cells

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生物医学工程学杂志 2005年第S1期22卷 101-102页

作者： Xue-Chao YANG Ming-Wen FAN(ministry education key lab. For Oral Biomedical engineering, Shool of Stomatology, Wuhan University,Wuhan 430079,China) Ministry Education Key Lab. For Oral Biomedical Engineering Shool of Stomatology Wuhan University Wuhan 430079 China

1 IntroductionDentinal repair in the postnatal organism occurs through the activity of specialized cells, odontoblasts,that are thought to be maintained by an as yet undefined precursor population associated with pulp... 详细信息

关键词： cell DPSCs Identification and Isolation of Human Dental Pulp Stem Cells DSPP

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Research progress of epiretinal prosthesis based on electrical stimulation

Research progress of epiretinal prosthesis based on electric...

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2005 First International Conference on Neural Interface and Control

作者： Wang, Xing Peng, Cheng-Lin Yang, Yong Key Lab. for Biomechanics and Tissue Engineering Chongqing University State Ministry of Education Chongqing 400044 China

ISBN: (纸本)0780389026

There are currently many experimental efforts to develop a treatment to restore useful vision for blind patients by electrical stimulation at epiretina, which is based on experiments that inner retinal layers can be electrically stimulated and elicit an electrical-evoked response. Generally, various researches on visual prosthesis are mainly focused on two solutions according to the research emphasis. One type is different designs surrounding the hardware circuitry, the other type is function evaluation and physiological test of artificial retina. On the one hand, there are probably three aspects, which are elementary structure, important factors of structure and biocompatible consideration. Among them, main structure generally consists of about three parts in theory. Moreover, it is claimed that other factors, such as electrode-retina interface and pulse shape, should be taken into account. And the last is material, electrode shape and production technique. On the other hand, in order to demonstrate that epiretinal stimulation actually helps construct a visual prosthesis, functional evaluation and physiological test of the artificial vision is required. At present, researchers mainly used several kinds of animals for vitro biocompatibility tests and vivo biocompatibility tests. Besides that, there are novel alternative which researchers attempted to find. This paper will begin with general considerations related to all or most of retinal prosthesis, and then concentrate on the epiretinal electrical design. At the end of the paper an outlook of the possible trend of epiretinal electrical stimulation in future is presented. © 2005 IEEE.

关键词： Functional electric stimulation

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Analysis of transmembrane potentials induced by pulsed electric field with different durations based on five-shelled dielectric model of cell

Analysis of transmembrane potentials induced by pulsed elect...

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2005 27th Annual International Conference of the engineering in Medicine and Biology Society, IEEE-EMBS 2005

作者： Chenguo, Yao Chengxiang, Li Yan, Mi Caixin, Sun Dengbin, Mo Key Lab. of High Voltage Engineering and Electrical New Technology Ministry of Education Chongqing University Chongqing 400044 China

ISBN: (纸本)0780387406

In order to account for the influence of subcellular organelles on transmembrane potential, five-shelled dielectric model of spherical cell was developed in this paper. And the calculation method of transmembrane potential induced by any pulsed electric field (PEF) was put forward. Thus the effects of different pulse duration on transmembrane potentials of cell membrane and nuclear membrane were also analyzed. It is shown that there is a strong relationship between the amplitude and waveform of transmembrane potential and pulse duration. PEF with shorter duration can reaches into the cell easily, thus with shorter duration pulses, transmembrane potential of nuclear membrane is increasing and close to that of cell membrane. So PEF with shorter duration will bring on some important biological effects, such as electroporation or apoptosis. © 2005 IEEE.

关键词： Cell membranes

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A novel three-phase rectifier topology with double frequency

A novel three-phase rectifier topology with double frequency

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2005 IEEE International Conference on Industrial Technology, ICIT 2005

作者： Luowei, Zhou Xiong, Du Quanming, Luo IEEE Key Lab. of High Voltage Engineering and Electrical New Technology Chongqing University Ministry of Education Chongqing China

ISBN: (纸本)0780394844

A novel topology of three-phase rectifier with double frequency is proposed in this paper. The topology is composed of two standard three-phase bridges, which work in different frequency. The novel converter topology employs the high frequency converter to improve power factor correction performance, and the low frequency one to handle power, so this topology is suitable for high power application with high performance and high efficiency. Because of the cascaded structure, there is no zero-sequence circulating current, which appears in converter's paralleling operation. The new topology has the same performance with the single high frequency three-phase rectifier, but the efficiency is close to a single low frequency one. The simulation and experiment results verify the validity of the proposed new topology and the corresponding control method. © 2005 IEEE.

关键词： Electric rectifiers

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A 3-D microelectrodes array microchip applied to cell fusion

A 3-D microelectrodes array microchip applied to cell fusion

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2005 27th Annual International Conference of the engineering in Medicine and Biology Society, IEEE-EMBS 2005

作者： Zhao, Zhiqiang Zheng, XiaoLin Xiong, Jiangong Cui, Jianguo Wen, Jing Li, Zhiguo Wang, Xing Key Lab. of Biomechanics and Tissue Engineering under the State Education Ministry Bioenginering College Chongqing University 400044 China

ISBN: (纸本)0780387406

A cell-to-cell fusion technique using 3-D microelectrodes array microchip has been developed. It permits cell-to-cell fusion operation in large amount simultaneously. And it needs much lower voltage (alternating voltage and pulse voltage) than the conventional cell fusion techniques. An array of 16 (4×4) microelectrodes can be fabricated on a 1×1cm silicon wafer. And an experimental system, including circuit control unit, temperature control unit, etc., has been developed to fuse cells. The alternating voltage is applied to the electrodes makes cells in alignment and in pairs firstly. Dielectrophoresis (DEP) force is used to form cell pairs in the microchip and makes cell pairs contact each other tightly. And then fusion of the cell pairs is induced by electric pulse is applied between electrodes. Microelectrodes of 8μm carbon-fiber are used to test the feasibility of the proposal experimental system, Human hepatocarcinoma SMMC-7721 cells are used as specimens. It's observed that SMMC-7721 cells formed cell pairs and fused successfully. © 2005 IEEE.

关键词： Microelectrodes

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Research progress of subretinal implant based on electronic stimulation

Research progress of subretinal implant based on electronic ...

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2005 27th Annual International Conference of the engineering in Medicine and Biology Society, IEEE-EMBS 2005

作者： Wang, Xing Peng, Chenglin Zhao, Zhiqiang Luo, Xiaogang Hu, Ning Zhang, Huiquan Key Lab. of Biomechanics and Tissue Engineering under the State Education Ministry Bioengineering College Chongqing University 400044 China

ISBN: (纸本)0780387406

Subretinal prosthesis is one kind of retinal prosthesis, which means that a microimplant based on MEMS technology is inserted in the subretinal space to stimulate the optic nerve and elicit an electrical-evoked response on the cortical region. The subretinal implant is made up of extraocular part and intraocular part. As an important part, the latter consists of accessorial setting and stimulation chip that contains microphotodiode array (MPDA) and microelectrodes. The paper main body is made up of four parts. Firstly significance of the retinal prosthesis is given out;secondly fundamentals on both in retina physiology and retinal prosthesis theory are introduced simply. Then the key segment about the subretinal microimplant is presented in detail. In the third segment, first of all is its design concept, the second is fabrication of MPDA which consists of several parts. First is microscopic configuration, electric prototype schematic and chip image COMS. The second is detailed fabrication flow with several special materials. Then is situation of its dimension. The fourth segment presents challenge and outlook. © 2005 IEEE.

关键词： Implants (surgical)

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