• 전기학회논문지
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• 제59권8호
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• pp.1456-1463
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• 2010

The safety critical systems in nuclear power plants should be designed to have a high level of fault tolerant capability because those systems are used for protection or mitigation of the postulated accidents of nuclear reactor. Due to increasing of the system complexity of the digital based system in nuclear fields, the reliability of the digital based systems without an auto-test or a self-diagnostic feature is generally lower than those of analog system. To overcome this problem, additional redundant architectures in each redundant channel and self-diagnostic features are commonly integrated into the digital safety systems. The self diagnostic function is a key factor for increasing fault tolerant capabilities in the digital based safety system. This paper presents an availability and safety evaluation model to analyze the effect to the system's fault tolerant capabilities depending on self-diagnostic features when the loss or erroneous behaviors of self-diagnostic function are expected to occur. The analysis result of the proposed model on the several modules of a safety platform shows that the improvement effect on unavailability of each module has generally become smaller than the result of usage of conventional models and the unavailability itself has changed significantly depending on the characteristics of failures or errors of self-diagnostic function.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2003년도 춘계학술발표대회 개요집
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• pp.138-139
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• 2003

This paper describes the control system which was designed and implemented for a new automatic welding equipment. The system has the self diagnostic function which facilitates maintenance and repairs, and also has the network function via which the welding task data call be transmitted and the welding process data can be monitored.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1137-1140
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• 2005

Automatic welding has been used frequently on pipeline projects. The productivity and reliability are most essential features of the automatic welding system. The mechanized GMAW process is the most widely used welding process and the carriage and band system is most effective welding system for pipeline laying. This application-oriented paper introduces new automatic welding equipment for pipeline construction. It is based on cutting-edge design and practical welding physics to minimize downtime. This paper also describes the control system which was designed and implemented for new automatic welding equipment. The system has the self diagnostic function which facilitates maintenance and repairs, and also has the network function via which the welding task data can be transmitted and the welding process data can be monitored. The laser vision sensor was designed for narrow welding groove in order to implement higher accuracy of seam tracking and fully automatic operation.

• 센서학회지
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• 제8권1호
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• pp.38-44
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• 1999

본 논문에서는 8빔 압저항형 가속도센서에서 하나 이상의 빔이 파손되는 대부분의 경우에 대하여 에러신호를 검출할 수 있는 자기진단회로를 구현하고, 이를 PSPICE를 사용하여 시뮬레이션으로 그 기능을 확인하였다. 또한 현재 상용으로 나오는 KA 324 증폭기의 레이아웃을 사용하여 자기진단회로를 표준 바이폴라(bipolar)공정을 이용하여 IC칩으로 제조하고, 24핀 플라스틱 패키지 한 후 자기진단 특성을 조사하였다. 이때, 측정된 회로의 자기진단 특성을 시뮬레이션 결과와 비교하였다.

• 한국산업정보학회논문지
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• 제28권6호
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• pp.1-10
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• 2023

원전 계측제어계통은 정상운전 시 자가 진단기능의 유지보수를 위해 일정 주기로 건전성을 확인하고 있으며, 계획예방정비 기간 동안 기능 및 성능점검을 실시하여 필요한 경우 유지보수를 하고 있다. 하지만 원전의 정보를 계측하고 제어하는 계측제어계통에서도 선제적으로 고장을 진단하고 대처하여 사고전파를 방지할 수 있는 기술개발이 필요하다. 이에 본 논문에서는 계측제어 장비의 환경조건과 자가 진단 데이터를 활용한 신뢰도 함수 추정 방안을 연구하였으며, 고장데이터의 획득을 위해 계측제어 장비의 부품에 대한 Feature 별 확률분포를 가정하여 가상 고장데이터를 생산하였다. 이러한 고장데이터를 바탕으로 생존분석에서 활용되는 대표적인 인공지능 모델(DeepSurve, DeepHit)을 이용하여 신뢰도 함수를 추정하였고, 그와 동시에 전통적인 준모수적 방법론인 Cox 회귀모델을 통해 신뢰도 함수를 추정하여 환경조건과 진단 데이터를 바탕으로 한 잔여 수명 계산을 통해 적용 가능성을 확인하였다.

• Transactions on Control, Automation and Systems Engineering
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• 제1권1호
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• pp.54-61
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• 1999

FCM(Fuzzy Cognitive Map) is proposed for representing causal reasoning. Its structure allows systematic causal reasoning through a forward inference. By using the FCM, authors have proposed FCM-based fault diagnostic algorithm. However, it can offer multiple interpretations for a single fault. In process engineering, as experience accumulated, some form of quantitative process knowledge is available. If this information can be integrated into the FCM-based fault diagnosis, the diagnostic resolution can be further improved. The purpose of this paper is to propose an enhanced FCM-based fault diagnostic scheme. Firstly, the membership function of fuzzy set theory is used to integrate quantitative knowledge into the FCM-based diagnostic scheme. Secondly, modified TAM recall procedure is proposed. Considering that the integration of quantitative knowledge into FCM-based diagnosis requires a great deal of engineering efforts, thirdly, an automated procedure for fusing the quantitative knowledge into FCM-based diagnosis is proposed by utilizing self-learning feature of neural network. Finally, the proposed diagnostic scheme has been tested by simulation on the two-tank system.

• 지역사회간호학회지
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• 제18권1호
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• pp.90-101
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• 2007

Purpose: The purpose of this study was to investigate influencing factors of health problems which the vinyl house farmers had experienced. Method: Based on PRECEDE model, this study was done with 110 respondents(50 to 69 years old), working in vinyl house and living in the remote area where the primary health post located. Results: Quality of life was low in economical status, emotional status, and physical function. Health problems were founded as pain and chronic fatigue that were caused by physical symptoms, weakened physical strength, and increased blood pressure and cholesterol. Behavioral and environmental factors were related with lack of exercise, irregular eating habit, curtailed sleep, overwork, wrong working postures, stress, and non-fulfillment of safety standard during spraying pesticide. Self efficacy was low in excercise practice, working way, and stress management. Conclusion: The Health Promotion Program for vinyl house farmers should be developed to improve health promoting behavior and self efficacy, to reduce stress, and to strengthen physical function.

• 동의생리병리학회지
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• 제33권3호
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• pp.163-168
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• 2019

In order to enhance the 8 principle pattern diagnosis rate comparing with diagnostic method by self-report questionnaire on cold/heat pattern in the clinical practice, a new diagnostic method using form-color-pulse-symptom (FCPS) system is proposed. FCPS system is composed of outputs of cold/heat pattern through the calculation process of contribution degree to the cold, heat pattern and qi, blood, yin, yang deficiency patterns, based on analysis of 16 mechanisms of disease calculated by diagnostic system of oriental medicine (DSOM) first. And second component is an output of differentiated 8 principle patterns in detail through binding and calculating process with digital informations of pulse, color, form, constitution obtained by computerized measurement system. Putting together above two processes consecutively, cold-heat complex or true/false cold/heat patterns and personalized characters of cold/heat patterns of each patient can be subdivided through a computation method of determining each pattern. In conclusion, 8 principle pattern identification can be performed more accurately using FCPS system than existent self report questionnaire method. These hypothetic proposal is needed to be proven by clinical trial for the future and then the accurate numbers used in each calculational function should be revised properly.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제28권1호
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• pp.23-30
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• 2022

Purpose: Health examination centers of regional public hospitals are essential facilities for strengthening preventive medical services in local communities. This study is to organize architectural planning data related to function, space, and area composition of health examination center by the size of the regional public hospitals. Methods: The literature review on the function and spatial composition of the health examination center and the drawings of the regional public hospitals were analyzed. Results: The result of this study can be summarized into several points. 1) The function of the health examination center consists of a diagnostic area, patient area, and staff area based on general examination and comprehensive examination. 2) The type of spatial composition of the 300-bed public hospital examination center is a spatial linkage type with examination rooms of the other departments where general examination and comprehensive examination are undifferentiated. 3) The examination center of public hospitals with 500 beds or more is composed of an independent space-separated type with self-installed examination rooms, and general examination and comprehensive examination are divided. 4) The examination center of public hospitals with 300 beds around, the diagnostic area occupies most of the total area, around 80%, but in public hospitals with 500 beds or more, the proportion of diagnostic area drops to 50-60%, and patient area increases to 30-40%. Implications: The examination center planning of public hospitals requires an architectural planning approach to the function and spatial composition according to the size of the hospital.

• 조명전기설비학회논문지
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• 제30권1호
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• pp.49-54
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• 2016

There is needed the quard channel triple wave lengths pyroelectric infrared flame detector to recognize the unique characteristics of fire sources in various type. This system detects the triple wave lengths of infrared flame emitting maximum radient energy and scattering frequency of flame. The quard channel infrared flame detector detects the duplicate wave lengths of maximum radient energy to enhance the accuracy of detecting fire. Especially this paper focuss on development of the self diagnosis function system including contamination, temperature and input voltage. Therefore, the prevention and early suppression of fire is available.