• 전기학회논문지
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• 제63권11호
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• pp.1526-1532
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• 2014

The Electronic Interlocking unit in railway signalling system is safety-related facilities to determine route and speed for train running. In particular, the SSI(Solid State Interlocking) is Electronic Interlocking unit for high-speed railway, and it performs safety-critical function by MPM(Micro-Processor Module). Meanwhile, MPM is composed of the PES(Programmable Electronic System)-based system, and the PES-based system in railway safety-related facilities should be implemented by complying with the safety requirements defined in IEC 62425 and IEC 61508. In this paper, we performed modeling of failure rate and reliability for MPM implemented by fault tolerance methods and analyzed functional safety for MPM. Moreover, we determined SIL(Safety Integrity Level) for MPM according to the safety requirements defined in IEC 61508 based on an analyzed functional safety.

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1915-1920
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• 2015

ISO 26262 is an international standard for the functional safety of electric and electronic systems in vehicles, and this standard has become a major issue in the automotive industry. In this paper, a functional safety compliant electronic control unit (ECU) for an electric power steering (EPS) system and a demonstration purposed EPS system are developed, and a software and hardware structure for a safety critical system is presented. EPS is the most recently introduced power steering technology for vehicles, and it can improve driver’s convenience and fuel efficiency. In conformity with the design process specified in ISO 26262, the Automotive Safety Integrity Level (ASIL) of an EPS system is evaluated, and hardware and software are designed based on an asymmetric dual processing unit architecture and an external watchdog. The developed EPS system effectively demonstrates the fault detection and diagnostic functions of a functional safety compliant ECU as well as the basic EPS functions.

• 대한한의학회지
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• 제43권3호
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• pp.150-163
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• 2022

Objectives: This research aimed to develop a guideline for evaluating safety and performance of electronic warm-acupuncture apparatus. With the development of medical devices like electronic warm-acupuncture apparatus with improved performance, convenience and safety measures compared to traditional warm-acupuncture needling, safety and performance guideline is a necessity. Methods: By referring to existing standards and guidelines of other electronic devices for Korean medicine with heating function, guideline for safety and performance assessment of electronic warm-acupuncture apparatus was drafted Results: The guideline, presents explanation for adequate temperature and settings of the apparatus, and safety measurements providing against thermal runaway situations along with guidelines for the manual. Guideline for detailed test method for the performance of the apparatus such as accuracy of temperature increase and the timer, and safety unit was also provided. The test items and suggested test methods for the requirements of biological, electrical and electromagnetic safety were referred to Korean approval documents of ministry of Food and Drug Safety. Conclusion: We proposed the relevant items to verify performance and safety of warm-acupuncture apparatus to assure patient safety and improve the quality of currently developing devices for application in clinical field.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2005년도 춘계학술대회
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• pp.259-266
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• 2005

In this paper, we developed a vehicle condition monitoring system that checks vehicle conditions, and transmits and displays them to a driver for safety and effective maintenance. We used a CAN controller and transceiver to establish the CAN communication that has been used commonly inside an actual vehicle for the collection of vehicle's status information. To validate the operation of the developed system, we have confirmed the accuracy and stability of data transmission and reception of vehicle information.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1998년도 춘계학술발표회논문집(1)
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• pp.862-868
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• 1998

Korean Next Generation Reactor(KNGR) is a standardized evolutionary Advanced Light Water Reactor design under development Korea Power Company(KEPCO). It incorporates design enhncements such as active and passive advanced design features(ADFs) to increase the plant safety. A Preliminary level 1 Probabilistic Safety Assessment(PSA) has been performed for KNGR to examine the effect of these safety features. The preliminary PSA result shows that it meets the KNGR safety goal on core damage frequency(CDF). The result of this safety assessment shows that the four-train safety systems, and the ADFs such as Passive Secondary Cooling System (PSCS) contributes greatly to the reduction the CDF. Furthermore, several design changes are made or proposed for detailed review based on the PSA insights.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 학술대회 논문집 전문대학교육위원
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• pp.204-207
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• 2006

Prevention of electrical and mechanical accidents from consumer switches needs early to detect and repair failure parts of the switches. But, safety accidents by the switches of consumers occur from non-systematic safety inspection techniques. So, we develope and propose the safety inspection techniques of the consumer switches.

• 한국항행학회논문지
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• 제22권4호
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• pp.288-294
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• 2018

항공기의 엔터테인먼트 시스템은 고정된 모니터를 사용하는 대신에 승객 개인의 휴대용 전자기기를 사용하는 형태로 그 패러다임이 바뀌었다. 이로 인해 기내 설비는 간소해진 반면 휴대용 전자기기들의 전기 충전으로 안전에 대한 리스크는 증가되었다. 송신 기능이 없는 개인 휴대전자기기와 달리 와이파이 기능이 있는 전자기기(T-PED)의 사용이 허용되고 기내에서 배터리의 충전도 요구된다. 본 연구에서는 기내 무선 환경과 엔터테인먼트 서비스의 변화에 따른 영향을 조사하기 위해 NASA 항공안전보고시스템을 이용하여 기내 전자기기 사용 관련 자료를 분석하였다. 이를 기초로 하여, 항공기 안전관리 관점에서 비행 중에 발생된 객실 전자장비나 승객 휴대용 전자기기(특히 스마트폰)로 인한 이벤트 발생 사례를 공유하여 개인용 전자기기의 위험성을 분석하였다. 이러한 분석을 위해 잠재적 위해요인의 식별과 리스크 평가 작업이 수행되었으며, 최종적으로 휴대용 전자기기의 안전한 사용을 위한 리스크 완화 전략이 제시되었다.

• 한국안전학회지
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• 제13권2호
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• pp.22-29
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• 1998

The natural convection cooling of simulated electronic chips located on a printed circuit board(PCB) has been studied by Computer Aided Engineering(CAE). In CAE, 3-dimensional finite element model of simulated electronic chip was made to accomplish heat transfer analysis at each design stage of a printed circuit boards for thermal optimization. The simulated electronic chips are installed protrudent from the plate about 3mm. The materials the plates are epoxy and aluminum. The results show that the chip with relatively high heat generation rates should not be close to each other. It is found, as well that cooling effect for the aluminum plate is superior to the epoxy plate and location of maximum temperature is significantly influenced by the structure variation of PCB. In developing PCB and electronic chips, it's recommended that CAE is very useful to estimate to the distribution of temperature.

• 한국안전학회지
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• 제26권5호
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• pp.13-16
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• 2011

The vibration and shock of the opto-electronic protective device was induced mechanical failure or fail to work correctly. In order to identify the exciting frequency components of vibration and shock, vibration signals are measured and analyzed from the mechanical power press. In addition, the modal test for the opto-electronic protective device was performed to investigate the dynamic characteristics. Some FEM simulations were carried out and then anti vibration mount was made for opto-electronic protective device. Based on the results of simulations, some kind of rubber mounts were tested to demonstrate the reduction of vibration and shock. It was verified by the test that a considerable amount of vibration and shock were reduced.

• 정보학연구
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• 제3권3호
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• pp.77-88
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• 2000

인터넷인구의 급속한 증가와 함께 전자상거래 역시 놀라운 증가 추세를 보이고 있다 그러나 전자상거래의 지급결제시스템은 여전히 신용카드와 온라인 입금 방식 위주로 이루어지고 있다. 그러나 이들 결제수단은 전자상거래 지급시스템으로는 불충분하다. 따라서 새로운 결제수단인 전자화폐를 전자상거래 지급수단으로 사용하기 위한 상용화 실험이 전세계에서 다양하게 시도되고 있으며 우리 나라의 경우에도 IC카드형은 금융기관을 중심으로 네트워크형은 전자상거래 관련 업체를 중심으로 상용화 실험이 활발히 진행 중에 있다 그러나 이들이 전자상거래 결제수단으로 자리잡기에는 몇 가지 과제가 있다. 특히 범용성확보를 위한 표준화 작업과 지불의 안정성과 가치의 안정성 확보를 위하여 난립하고 있는 전자화폐 발행 업체의 정비 및 엄격한 규제와 함께 예금보호 적용여부도 신중히 검토할 필요가 있다. 또한 전자상거래 업체들의 전자화폐 기피 현상을 해소할 수 있는 정책적 배려가 요청된다.