• Title, Summary, Keyword: 시스텐 공학

Search Result 5, Processing Time 0.028 seconds

Measurement of Viscoelastic Properties of Heat Denatured Gluten Network (열변성 글루텐의 점탄성 측정에 관한 연구)

  • Hong, Sung-Hie;Lee, Cherl-Ho
    • Korean Journal of Food Science and Technology
    • /
    • v.20 no.2
    • /
    • pp.148-156
    • /
    • 1988
  • A method for the measurement of viscoelastic properties of heat denatured gluten network was developed in order to evaluate the noodle making quality of wheat flour. The stress relaxation of elongated heat denatured gluten network could be expressed by 6-element generallized Maxwell model. The tensile force of heat denatured gluten network increased by the heating time. The elastcity and viscosity of the first exponential term which covers 70-74% of the total relaxation increased as cooking time was extended up to 1q min. The addition of gluten network strengthening agent, potassium bromate, at 1000ppm level reduced the elasticity and viscosity, while weakening agent, L-cystein, increased them. The relaxation time decreased after 11 min of cooking in both cases. The elasticity and viscosity of heat denatured gluten were affected differently by the concentration of added urea.

  • PDF

A Study on the Enterprise Architecture to Develop the Requirements for Railway Safety Support information Systems (철도안전정보 지원시스템의 요구사항 개발을 위한 엔터프라이즈 아키텍처 활용 연구)

  • Lee, Byoung-Gil;Lee, Jae-Chon
    • Journal of the Korean Society for Railway
    • /
    • v.10 no.6
    • /
    • pp.751-757
    • /
    • 2007
  • This paper is concerned with the development of the requirements for railway safety support information systems. The five safety elements at the system level have been modeled based on the enterprise architecture approach. Specifically, the modeling has been carried out as follows. First, the requirements are derived according to EIA-632 process. Also, the possible scenarios on the accident-investigation-support are developed from the help of relevant personnel in the area. The developed scenarios are reflected in modeling the operational and system architectures of DoDAF approach using a CASE tool. From this architecture model, we can easily get the specifications required for the operations. These results can give the improved understanding of the railway safety system to the members of diverse teams and areas working for the system development.

An Execution Control Algorithm for Mobile Flex Transactions in Mobile Heterogeneous Multidatabase Systems (이동 이질 멀티데이타베이스 시스텐을 위한 이동 유연 트랜잭션의 실행 제어 알고리즘)

  • Gu, Gyeong-Lee;Kim, Yu-Seong
    • The Transactions of the Korea Information Processing Society
    • /
    • v.6 no.11
    • /
    • pp.2845-2862
    • /
    • 1999
  • As the technical advances in portable computers and wireless communication technologies, mobile computing environment has been rapidly expanded. The mobile users on mobile host can access information via wireless communication from the distributed heterogeneous multidatabase system in which pre-existing independent local information systems are integrated into one logical system to support mobile applications. Hence, mobile transaction model should include not only the features for heterogeneous multidatabase systems but also the ones for mobile computing environment. In this paper, we proposed a mobile flex transaction model which extends the flexible transaction model that previously proposed for heterogeneous multidatabase systems is extended to support the requirements of mobile heterogeneous multidatabase systems. We also presented the execution control mechanism of the mobile flex transaction model. The proposed mobile flex transaction model allows the definition of location-dependent subtransactions, the effective support of hand-over, and the flexibility of transaction executions. Hence, the proposed mobile flex transaction model can be suit to mobile heterogeneous multidatabase systems that have low power capability, low bandwidth, and high communication failure possibility.

  • PDF

Design and Analysis of Digital Circuit System Considering Power Distribution Networks (파워 분배망을 고려한 디지털 회로 시스템의 설계와 분석)

  • Lee, Sang-Min;Moon, Gyu;Wee, Jae-Kyung
    • Journal of the Institute of Electronics Engineers of Korea SD
    • /
    • v.41 no.4
    • /
    • pp.15-22
    • /
    • 2004
  • This paper presents the channel analysis considering power distribution network(PDN) system of PCB. For achieve the target PDN system we proposed the useful design approach for acquiring the characteristic target of power distribution network in overall frequency ranges. The proposed method is based on the hierarchical approach related to frequency ranges and the path-based equivalent circuit model to consider the interference of the current paths between the decoupling capacitors and the board through it is a lumped model for fast and easy calculation, experimental results show that the proposed model is almost as precise as the numerical analysis. The analysis of PDN system shows that although the effective inductance of package dominatly affects the power noise and the signal transfer through data channel, the board PDNs also can not be neglected for achieving the accurate channel signaling. Therefore, we must design concurrently the chip, package, and board from the initial spec design of high speed digital system.