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Tsinghua Science and Technology

Issue 2 • June 1999

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Displaying Results 1 - 23 of 23
  • [Front cover]

    Publication Year: 1999, Page(s): c1
    IEEE is not the copyright holder of this material | PDF file iconPDF (1572 KB)
    Freely Available from IEEE
  • Contents

    Publication Year: 1999, Page(s):1 - 2
    IEEE is not the copyright holder of this material | PDF file iconPDF (197 KB)
    Freely Available from IEEE
  • Concurrent engineering research and application

    Publication Year: 1999, Page(s):1375 - 1385
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1816 KB)

    Research and application of Concurrent Engineering have produced good results. A Chine se style concurrent engineering architecture and reference mode has been produced. A series of break thoughts in BPR (Business Process Reengineering) have been made with organization of the IPT (Integrated Product Development Team) and engineering support technologies. Several prototype tools were developed, inc... View full abstract»

    Open Access
  • Product development process modeling

    Publication Year: 1999, Page(s):1386 - 1391
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (965 KB)

    The use of Concurrent Engineering and other modern methods of product development and maintenance require that a large number of time-overlapped "processes" be performed by many people. However, successfully describing and optimizing these processes are becoming even more difficult to achieve. The perspective of industrial process theory (the definition of process) and the perspectiv... View full abstract»

    Open Access
  • Consistent algorithm for multi-value constraint with continuous variables

    Publication Year: 1999, Page(s):1392 - 1396
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (862 KB)

    Mature algorithms for the Constraint Satisfaction Problem (CSP) of binary constraint with discrete variables have already been obtained for the application. For the instance of multi value constraint with continuous variables, the approach will be quite different and the difficulty of settling will aggrandize a lot. This paper presents the algorithm for realizing global consistency of continuous v... View full abstract»

    Open Access
  • Case based reasoning in conflict negotiation in concurrent engineering

    Publication Year: 1999, Page(s):1397 - 1402
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1090 KB)

    Case-based reasoning (CBR) is a kind of analogous reasoning that is widely used in artificial intelligence. Conflicts are pervasive in Concurrent Engineering design environment. Conflict negotiation is necessary when conflicts occur. It is difficult to resolve conflicts due to several reasons. An approach to resolving conflicts by case-based reasoning is proposed in this paper. The knowledge repre... View full abstract»

    Open Access
  • Feature analysis of STEP application protocol and its application

    Publication Year: 1999, Page(s):1403 - 1406
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (757 KB)

    This paper uses semantic data modelling and CAD/CAPP/CAM integration to analyze the features defined in the STEP AP214, its characteristics of definition and distribution, and its influence on the complexity of CAD/CAPP/CAM application integration. A framework is developed for applications of CAD/CAPP/CAM integration based on the STEP to reduce the complexity of integration implementation. Two app... View full abstract»

    Open Access
  • Multimedia conferencing system and multicasting

    Publication Year: 1999, Page(s):1407 - 1411
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (905 KB)

    The multimedia conferencing system is an important tool for Computer supported Cooperative Work (CSCW), and also one of the basic techniques supporting team work in the Concurrent Engineering. In this paper the architecture and function modules of the reported multimedi a conferencing system are described. Then in order to reduce the network bandwidth required by the conferencing system, two metho... View full abstract»

    Open Access
  • Concurrent engineering oriented CAx/DFx information integration

    Publication Year: 1999, Page(s):1412 - 1417
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1028 KB)

    The information integration, especially in CAD/CAPP/CAM, is a basis for realizing the integrated and concurrent product development in Concurrent Engineering (CE) environment. The integration technology based on STEP application protocol gives an effective way for the CAx/DFx information integration. This paper discusses the characteristics of concurrent product development, analyzes the methodolo... View full abstract»

    Open Access
  • DFM/CAPP/CAM system in a concurrent engineering environment

    Publication Year: 1999, Page(s):1418 - 1423
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1170 KB)

    In this paper the importance of DFM/CAPP/CAM system in Concurrent Engineering (CE) is discussed. Based on the analyses of the character of concurrent product design and manufacturing process design, the workflow of DFM/CAPP/CAM system in CE is given. DFM/CAPP/CAM theories, methods and functions are invesigated in a delicate and all-round way, and are implemented in the developed DFM/CAPP/CAM syste... View full abstract»

    Open Access
  • CAPP framework system for concurrent engineering

    Publication Year: 1999, Page(s):1424 - 1430
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1286 KB)

    Difficulty in generalizing and lack of adaptability are important factors that hamper a computer aided process planning (CAPP) system from being popular and practical. New manufacturing philosophies such as Concurrent Engineering require special characteristic of a CAPP system. Proposed in this paper is a CAPP framework system for Concurrent Engineering (CAPPFS-CE) which can meet the requirements ... View full abstract»

    Open Access
  • Numerical simulation system for casting process in concurrent engineering

    Publication Year: 1999, Page(s):1431 - 1435
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1170 KB)

    According to the implementing principle and application background of the Concurrent Engineering (CE) project, studies on the integration of numerical simulation system for casting process with CE, simulation of turbulent phenomena in filling process of casting by Algebraic Stress Model (ASM), computation efficiency of filling process and quantitative prediction of shrinkage cavity and porosity un... View full abstract»

    Open Access
  • Assembly sequence planning for mechanical products

    Publication Year: 1999, Page(s):1436 - 1439
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (779 KB)

    A method for assembly sequence planning is proposed in this paper. First, two methods for assembly sequence planning are compared, which are indirect method and direct method. Then, the limits of the previous assembly planning system are pointed out. On the basis of indirect method, an improved method for assembly sequence planning is put forward. This method is composed of four parts, which are a... View full abstract»

    Open Access
  • Part machinability evaluation system

    Publication Year: 1999, Page(s):1440 - 1442
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (557 KB)

    In the early design period, estimation of the part or the whole product machinability is useful to consider the function and process request of the product at the same time so as to globally optimize the design decision. This paper presents a part machinability evaluati on system, discusses the general restrictions of part machinability, and realizes the inspection of these restrictions with the r... View full abstract»

    Open Access
  • Automatlc fixture planning

    Publication Year: 1999, Page(s):1443 - 1447
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (995 KB)

    Fixture planning is a, crucial problem in the field of fixture design. In this paper, the research scope and research methods of the computer-aided fixture planning are presented. Based on positioning principles of typical workparts, an ANN algorithm, namely Hopfield algorithm, is adopted for the antomatic fixture planning. Also, this paper leads a deep research into the selection of positioning a... View full abstract»

    Open Access
  • Study and application of cooperative work environment

    Publication Year: 1999, Page(s):1448 - 1450
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (580 KB)

    The concept of Cooperative Work Environment (CWE) is introduced. Three key elements of CWE, inforrration integration, process integration, and organization integration, are analysed. An application framework of CWE is prcoosed and with this framework a CE CWE based on Lotus Notes/Domino and Intel Proshare used in a large enterprise is introduced. View full abstract»

    Open Access
  • Affinity capillary electrophoresis: Study of the binding of HIV-1 gp 41 with a membrane protein (P45) on the human B cell line, Raji

    Publication Year: 1999, Page(s):1454 - 1457
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (686 KB)

    Affinity capillary electrophoresis has been used to study the interaction between a membrane protein (P45) isolated from the Human B cell line, Raji, and rsgp 41. P45, rsgp 41 and the complexes were well resolved. The entire separation was achieved in less than 3 min. Formations of two kinds of stable P45-rsgp 41 complexes were confirmed based on migration time comparison; the binding equilibrium ... View full abstract»

    Open Access
  • Electronic states of some semiconductor clusters

    Publication Year: 1999, Page(s):1458 - 1461
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (777 KB)

    Potential surfaces and equilibrium geometries of InAs2, In2As, InAs2+ and In2As+ were studied using the complete active space multi-configuration self consistent field (CASMCSCF) technique. Two electronic states, namely 2B2 and 2B1 were fround to prevail as the ground states ... View full abstract»

    Open Access
  • Determination and prediction of binary solubility for aromatic-tetraethylene glycol (with water) systems

    Publication Year: 1999, Page(s):1462 - 1465
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (758 KB)

    The binary solubilities of tetraethylene glycol (TTEG) with benzene, toluene or p-xylene, were measured by the turbidity point method. In TTEG the content of water ranged from 0 to 5% and the test temperature ranged from 20°C to 120°C. Increasing the temperature resulted in greater solubility of the aromatics in TTEG, while increasing the content of water caused the aromatic solubili... View full abstract»

    Open Access
  • Filtration process of the spiramycin fermentation broth

    Publication Year: 1999, Page(s):466 - 1471
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (921 KB)

    This paper presents the effects Of acidity and additive pretreatment on the filtering rate and Spirarnycin (SPM) concentration in the filter liquor of SPM fermentation broth. The experimental results show that the SPM peak value in filter liquor iS obtained at pH5.5 with either 0.1% methanal or 0.1% BAPE. It is also indircatedt that there exists a dissolution equilibrium of proteins from the exper... View full abstract»

    Open Access
  • Overexpressions of lambda phage lysis genes and biosynthetic genes of poly-β-hydroxybutyrate in recombinant E. coli

    Publication Year: 1999, Page(s):1472 - 1476
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1125 KB)

    A plasmid (pTu9) containing the lambda (λ) phage lysis genes S(−) RRz and the biosynthetic genes phb CAB of poly-β-hydroxybutyrate (PHB) was constructed and transformed into E. coli JM109. Oultured in Luria Bertani (LB) medium with 20g/Lglucose, E. coli JM109 (pTu9) could accumulate PHB in cells up to 40% (g PHB per g dry cells). Achelating agent EDTA was applied to induce a ... View full abstract»

    Open Access
  • Extractive distillation with salt in solvent

    Publication Year: 1999, Page(s):1477 - 1479
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (601 KB)

    Extractive distillation with salt in solvent is a new process for producing anhydrous ethand by combining the principle of “salt effecf” and some traditional extractive distillation methods. Compared with the common extractive distillation the performance of solvent is improved, the recycling amount of slovent is reduced to 1/4–1/5, and the number of theoretical plates is redu... View full abstract»

    Open Access
  • Synthesis of ultrafine AlN powders in an Al-OC-N system

    Publication Year: 1999, Page(s):1480 - 1484
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1255 KB)

    AlN powders were Synthesized by both ordinary and modified processes of carbothermal reduction and nitridation in an Al-OC-N system. In the ordinary process, the AlN phase appeared at 1300°C for 6h and the nitridation was completed at 1600°C for 6h. The particle size of the ordinary AlN powders was about 1μm and the specific sarface area was 1–1.5 M2/g. In th... 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.

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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