• 대한설비관리학회지
• /
• 제23권4호
• /
• pp.29-38
• /
• 2018

Through process quality information, the time required for process quality analysis has been drastically shortened, the process defect rate has been reduced, and the manufacturing lead time has been shortened and the on-time delivery rate has been improved. Therefore, The purpose of this study is to develop a quality information analysis system model that effectively shortens the time required for process quality analysis in automobile safety belt parts manufacturing process. As a result of experiments on communication operation between manufacturing execution system (MES) quality server, injection machine control computer, injection machine programmable logic controller (PLC) and terminal, in analyzing quality information, the conventional handwriting input method took an average of 20 minutes, but the new multi-network method took about 2 minutes on average. In addition, the process defect rate was reduced by 13% and the manufacturing lead time was shortened from 28 hours to 20 hours. The delivery compliance rate improved from 96 to 99%.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
• /
• pp.1008-1011
• /
• 1996

Most control systems of power plants are using classical PID controllers for their process control. In order to get the desired control performances, the correct tuning of PID controllers is very important. Sometimes, it is necessary to retune PID controllers after the change of system operating condition and system design change, etc. Commercial auto-tuning controllers such as relay feedback controller can be used for this purpose. However, using these controllers to the safety-critical systems of nuclear power plants may be cause of unsafe operation, because they are using test signals for tuning. A new system identification auto-tuning method without using test signal has been developed in this paper. This method uses process input/output signals for system identification of unknown control process. From the model information of control process which was obtained from system identification approach, the optimal PID parameters can be calculated. The method can be used in the safety-critical systems because it is not using test signals during system modeling process.

• 대한안전경영과학회지
• /
• 제9권5호
• /
• pp.49-55
• /
• 2007

A special cause producing temporary deviation in the underlying process can influence on process adjustment in First-Order System feedback control system. In this paper, the impact of special causes on the forecasts and the process adjustment that is based on the EWMA forecasts are derived for a first-order system. For some special causes with patterned type of contamination, the influence of the causes on the output process are explicitly investigated. A data set, contaminated by a special cause of level shift, is analyzed to confirm the impact numerically.

• 한국기계가공학회지
• /
• 제19권11호
• /
• pp.1-7
• /
• 2020

Recently, hydrogen has gained considerable attention as an eco-friendly fuel, which helps in reducing carbon dioxide content. Specifically, there is a growing interest in vehicles powered by a hydrogen fuel cell, which is spotlighted as an environmental-friendly alternative. A hydrogen transport system, fuel cell system, fuel supply system, power management system, and hydrogen storage system are key parts of a hydrogen fuel cell truck. In this study, a hydrogen storage system is built and analyzed. The expansion length of the storage vessel at maximum operating pressure (87.5 MPa) was calculated with ABAQUS, and then the optimized system was designed and built. The leak and bubble tests were performed on the built storage system. The leakage of the system was measured to be under 5 cc/hr. Hence, it can be used as a research test for the safety evaluation of leading systems of hydrogen fuel-powered commercial vehicles.

• International Journal of Railway
• /
• 제2권3호
• /
• pp.113-117
• /
• 2009

Risk management is an important part of system assurance and it is widely used in safety-related system. Railway signal system is one kind of safety-related system and its most important goal is to guarantee the safety of railway system. The method based on risk management can find and solve the security issues of railway signal system more effectively. This paper introduces the basic conception of risk management, studies the whole process of risk management and related tools and techniques and discusses some key points qualitatively combining with the particularity of railway signal system.

• 대한안전경영과학회지
• /
• 제14권4호
• /
• pp.23-29
• /
• 2012

There are insufficient models that find problems and solutions for accident prevention through risk assessment and suggest safe work process and work instruction from foundation works to finish work for accident decrease. This paper presents a quantitative risk assessment model by analysis of risk factors in each process such as appurtenant works, temporary works, structural works, equipment work, finishing work and etc based on accident examples and investigation on actual condition in plants construction work. In addition, the safety management system was developed to perform risk assessment of plants construction and use it for effective safety training for labor.

• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2005년도 추계학술대회
• /
• pp.194-198
• /
• 2005

Inventory information system is providing the benefits of smoother demand, lower inventories(work in process, safety stock) and reduced costs. This study focused on improvement of safety level inventory efficiency by inventory information system. The results indicated that inventory information system allowed the company to serve its customers more surely and efficiently.

• 한국가스학회지
• /
• 제23권2호
• /
• pp.55-60
• /
• 2019

가상현실 기술을 이용한 플랜트 안전훈련 시스템 개발을 위해서 대규모 플랜트를 대상으로 훈련 시스템을 구성하였다. 소규모 플랜트 또는 단위장치의 안전훈련에 비해서 가상 플랜트 구현, 공정 내 데이터 처리, 작업 지시 등 많은 시스템 구성이 필요하며 이들에 대한 통합 시스템 작업을 진행 하였다. 대상 플랜트인 RDS 공정은 고온 고압의 위험도가 높은 공정으로 해당 범위에서 누출로 인한 화재가 발생할 경우에 조치할 수 있는 훈련 시나리오를 고려하였으며 실제 사용 중인 운전 정지 절차를 참조하였다. 제안한 안전훈련 통합 시스템은 RDS 공정에서 일어날 수 있는 유사 상황에서도 이용 가능하며 대규모 플랜트에서의 가상현실을 이용한 안전훈련의 새로운 플랫폼으로 고려될 수 있다.

• 대한안전경영과학회지
• /
• 제7권4호
• /
• pp.165-177
• /
• 2005

Supply Chain Management(SCM) system is a critical investment that can affect future competitiveness and performance of a company. Selection of a right SCM system is one of the critical issues. This paper provides the characteristic factors of SCM system selection and the SCM system evaluation and selection model based on Analytic Hierarchy Process(AHP). The proposed model can systematically construct the objectives of SCM system selection to support the business goals. A empirical example demonstrates the feasibility of the proposed model and the model can help a company to make better decision-making in selecting SCM system.

• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2016년도 춘계학술대회
• /
• pp.404-406
• /
• 2016

해양시추시스템에 대한 국산화과정을 통해 안전성 확보가 중요한 현안으로 부각되고 있다. 이에 따라 해양시추시스템의 각 개발공정에 대한 단계별 안전성 분석 수행이 의무화되고 있다. 위험과 운전분석은 화학공장과 같은 산업에서 시스템 안전성 분석을 위해 성공적으로 사용되었던 기법이다. 이 위험과 운전분석 Study를 통해 공정에 따른 단계별 안전성 분석을 수행을 위해 해양시추시스템의 한분야인 LP Mud System에 위험과 운전분석을 수행하였다.