• Title, Summary, Keyword: system

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A Proposal of Quality Assessment for System Model

  • Onozuka, Yuki;Ioki, Makoto;Shirasaka, Seiko
    • Journal of the Korea Society of Systems Engineering
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    • v.12 no.2
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    • pp.59-67
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    • 2016
  • Recently, the increased complexity of systems has made systems engineering necessary. It is very useful for system designers to understand the whole context of the concerned system based on systems engineering. A system model can be used to describe the outcome of a system design. A system model describes the system from the viewpoint of the stakeholder's needs using the mutually exclusive and collectively exhaustive principle. A system model can be used to smoothly design a large and complicated system based on the systems engineering development process. Many companies and countries are attempting to apply model-based systems engineering, and the significance of the system model quality is increasing as system models are referenced during system development. In this paper, we propose a quality assessment method for ontology which is one of system models by focusing on the system development process. First, in this process, a system developer should explicitly show the relationship between viewpoints. Then, the system developer should select dependent rather than independent viewpoints. With dependent viewpoints, each viewpoint used to describe the system has some logical relationship. The set of viewpoints makes it possible to show, not only tangible and physical system parts, but also conceptual system parts. In this paper, we develop an ontological system model of a Japanese weather observation system. By comparing some ontological system models, we verify the effectiveness of explicitly describing the relationships between viewpoints and select dependent viewpoints.

The implementation of Access Control System using Biometric System (Biometric System(fingerprint Reader)을 이용한 Access Control System 구현에 관한 연구)

  • 김광환;김영길
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.439-442
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    • 2003
  • In this paper, a system that implementation of Access Control System Using Biometric System. Biometrics is science which deals with verifying or recognizing using physiological or behavioral characteristic Access Control System uses Biometric system to make an access control system. Biometrics goes under the study of bio-recognition or bio-measurement. It is a technology or study that identifies individuals using one's Biometric character. Access control system is a system used to identify one's entrance and exit, personal management, and security. Access control system can be joined with Biometric system to produce easier use and more sufficient effects. Access control system using Wiegand (Data Format) signal output, can replace earlier RF Card systems and make an access control (security) system. It uses RS-232, Rs-422 or TCP/IP type communication with the computer so an embedded system can be controlled using the software.

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The implementation of Access Control System using Biometric System (생체인식 시스템을 이용한 Access Control System 구현에 관한 연구)

  • 김광환;김영길
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.2
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    • pp.494-498
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    • 2004
  • In this paper, a system that implementation of Access Control System Using Biometric System. Biometries is science which deals with verifying or recognizing using physiological or behavioral characteristic Access Control System uses Bionietric system to make an access control system. Biometrics goes under the study of bio-recognition or bio-measurement. It is a technology or study that identifies individuals using one's Biometric character. Access control system is a system used to identify one's entrance and exit, personal management, and security. Access control system can be joined with Biometric system to produce easier use and more sufficient effects. Access control system using Weigand (Data format) signal output, can replace earlier RF Card systems and make an access control (security) system. It uses RS-232, Rs-422 or TCP/IP type communication with the computer so an embedded system can be controlled using the software.

Configuration of a Boiler Control System in Thermal Power Plant (화력 발전소 보일러 제어 시스템의 구성에 관한 연구)

  • 변승현;박두용;김병철;신만수
    • 제어로봇시스템학회:학술대회논문집
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    • pp.168-168
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    • 2000
  • In this paper, a boiler control system for thermal power plant is configured. The boiler control system for thermal power plant is largely composed of an ABC(Automatic Boiler Control) system and a MBC(Mill Burner Control) system. ABC system controls analog process values, so almost all analog control logic is dealt with in ABC system. On the other hand, MBC system relates to sequence control logic such as MFT logic, Furnace Purge, Safety related logic. Advanced control systems made from advanced countries deal with an ABC system and MBC system in a distributed control system. In this paper, we adopt a DCS as an ABC system and adopt a PLC system as a MBC system to configure a boiler control system for thermal power plant using domestic control system. Finally the validity of the configured boiler control system is shown via simulation using digital simulator for boiler system in thermal power plant.

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A Study on the Transition & Expectation through Survey for Existing Building and Engineer's Opinion (기존 사무소 건물 및 설비전문가 조사를 통한 설비시스템의 변화와 전망에 대한 연구)

  • Lee, Gwan-Ho;Kim, Nam-Gyu;Park, Jin-Chul;Rhee, Eon-Ku
    • Journal of the Korean Solar Energy Society
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    • v.25 no.2
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    • pp.63-69
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    • 2005
  • This study is the survey of a transition procedure of building services systems(heat source, HVAC, water supply) through the survey of existing office buildings, building design documents. The preference & major consideration of system selection is the engineer's opinions. The results of this survey can be used in selection of building services system design. In this survey, "Hot & cold water generator system" and "single duct CAV+FCU system", "Elevated water tank system" are selected. The most important consideration in system selection is the energy saving in heat source system, and comfort in HVAC system, and water pressure in water supply system. They prefer "steam boiler+absorption chiller system" for heat source system, "steam boiler+ice thermal storage system", "hot & cold water generator system", "district heating+absorption chiller system" : "single duct CAV+FCU system" and "single duct VAV+convector system" for HVAC system: and "booster pump system" for water supply system.

The Recognition of Energized & Deenergized System Using System Matrix in Expert system (전문가 시스템에서의 system matrix를 이용한 정전 및 비정전구간 인식)

  • Ham, W.K.;Chu, J.B.;Kim, K.J.;Sim, K.J.;Jo, H.H.
    • Proceedings of the KIEE Conference
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    • pp.237-240
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    • 1989
  • This paper deals with the expert system for power system recognition of energized and deenergized system using circuit breaker information. The basic idea is isolating the system with the system matrix representing the system configuration and the states of the circuit breakers. The knowledge base is composed of these isolated systems and decision rules. The isolated system with the sources is recognized as the energized system and the system without the source as the deenergized system. The rules use the system matrix and the the inference scheme is simplified in a great deal. Above all, the overall searching labor of the rules is independent on the system size and it is possible to expand into the real system and the real time restoration can be carried out easily. The expert system is written in PROLOG.

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The Current of Ultrapure Water System (초순수 제조공정현황)

  • 이창소
    • Membrane Journal
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    • v.6 no.3
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    • pp.127-140
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    • 1996
  • 국내의 초순수 제조장치는 90% 이상이 이온교환수지를 사용하는 이온교환법과 UF, R/O System과 같은 Membrane을 사용하는 Membrane System을 병행하여 적용하고 있다. 국내 초순수처리 Plant에서는 통상 전처리 System과 1차 순수제조 System및 초순수 System이 상호 연결되어 Plant가 구성 운영되고 있다. 전처리 System에는 응집침전, 여과 흡착, 살균 등이 적용되고 있으며 여과 System에 Membrane을 적용할 수 있으나 국내에서는 특별한 경우를 제외하고 대부분 전처리 여과 System에 Media Filter를 사용한다. 전처리 System도 순수처리 장치의 전처리로는 없어서는 안되는 System이지만 여기에는 전처리 System을 제외하고 국내에서 적용하고 있는 초순수처리 System의 공정현황과 각 System별 특징을 설명하였다. 초순수 System에는 요구 수질에 따라 다소 차이가 있지만 반도체 공업에서 사용되는 초순수 System이 이중 최고의 Grade로 반도체공업에서 적용되고 있는 System을 기준하였다. 특히 Membrane을 적용한 초순수제조 System이 증가하고 있어 R/O, ED, EDR, CDI(EDI)와 같은 Membrane System의 특성과 원리를 검토하였다.

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The study of verification for reliability in train control embedded system (열차 제어 임베디드 시스템에서의 신뢰성 검증에 관한 연구)

  • Hong, Hyo-Sik
    • Proceedings of the KSR Conference
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    • pp.483-494
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    • 2009
  • Since the embedded system is more intelligent, the importance of the reliability in the embedded system is a lot more visible. Especially the reliability of the embedded system in the train control system is even better important. As the special quality of the embedded system, the hardware of the system is directly controlled by the software in the embedded system. As the expansion of complexity, the expense amd the time for verification is required more and more. This paper is presented the verification of the reliability as the method with background of failure Embedded system is gradually, the importance of 'A built-in on the system embedded system's reliability is focused. In particular, in the train control system built-in of the embedded system, reliability is even more important. The embedded system of the system controls over hardware, software with built-in directly. The more complex system is, the more increasable of depending on the reliability of the time verification and expensive is. This paper is about he characteristics of the reliability and verification of embedded system under the failure mechanisms, based on the verification methodology suggested by in the train control system.

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KBS ALL-IP based UHD LIVE Broadcasting System (KBS ALL-IP 기반 UHD LIVE 방송시스템)

  • Shin, Jongseob;Koh, Ujong;Lee, SeungHo;Kim, Chulhwan;Kim, Bongseong;Choi, Mugyeong;Song, Jaeho;Ko, Yongseok;Lee, Donil;Choi, Minyeong;Lee, Jaegwan;Choi, Jongcheol;Hwang, Inju;Cho, Seungwan;Kim, Byeongu;Park, Hocheol;Woo, Deokjun;Park, Insu;Kim, Jinhong;Hong, Seokmyeong;Kim, Seongtae;Kim, Haejung;Cho, Hyeongjun;Shin, Hyeonuk;Yu, Gyeongho;Lee, Munsik;Ham, Jeongwan
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.186-189
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    • 2018
  • KBS는 차세대 방식인 IP전송 기술을 UHD방송에 적용하기로 결정하고 2017년 9월부터 2018년 3월까지 약 7개월에 걸쳐 ALL-IP UHD부조정실 구축을 완료했다. 이후 약 3개월간의 시뮬레이션 기간을 거쳐, 현재 KBS 1TV '아침마당'과 '무엇이든 물어보세요' 를 생방송으로 제작하고 있고 KBS 2TV '그녀들의 여유만만'을 녹화 제작하고 있다. 본 논문은 UHD비디오신호와 오디오신호를 ALL-IP로 전송하기 위해 참조한 표준기술과 각 파트별 구축 세부내용을 소개한다. 또한 향후 지속적으로 발전할 IP제작 시스템에 대해 효율적인 계획과 대응을 할 수 있도록 구축사례에 대한 경험을 결론으로 논한다.

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The application of open system architecture in power SCADA system (전력감시제어설비(SCADA)의 open system architecture 적용)

  • 이용해;문국연;박장범
    • 제어로봇시스템학회:학술대회논문집
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    • pp.992-995
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    • 1996
  • The major roles of Power SCADA System are continuous monitoring of electrical equipments state, real-time data processing and dispatching. Especially, SCADA system demands fast response time in heavy load condition, high reliability, fault tolerance, expansion capacity for the future. According to developing computer system technology, SCADA system is changing system configuration from centralized processing system to distributed processing system. This paper describes operational benefits, problems and improvement (which is studying in theory) in the application of Open System Architecture SCADA which has been installed since 1994, Seoul regional control center in KEPCO.

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