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송재용 ( J Y Song ),사승훈 ( S H Sa ),남정우 ( J W Nam ),김진표 ( J P Kim ),조영진 ( Y J Cho ),오부열 ( B Y Oh ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.2
This paper describes electrical fire on electric pad caused by defect of hot wires, We analyzed two type electric-using by carbon type hot wire and magnetic shielded type hot wire, First, a carbon type hot wires electric-is virtually impossible to connect hot wire as a method of electrical welding or soldering, In order to connect between hot wires, that has to splice carbon type material connector, If junction of hot wires was occurrence of poor connection on electric pad, it increase contact resistance on this junction point With increasing contact resistance, junction of hot wires on electric-generates local heating and finally leads to electrical fire. An electric-using by a magnetic shielded type hot wire happened local heating on signal wire for sensing temperature-rise caused by applying current for magnetic shielded. With increasing local heating of signal wire, insulated coating of hot wire was melted. Finally the magnetic shielded type hot wire electric pad lead to electrical fire with breakdown between signal wire and hot wire, In this paper, we analyzed shape of damage in hot wire caused by electrical local heating and investigated fire cause on electric pad due to defect of hot wires.
송재용 ( J Y Song ),김진표 ( J P Kim ),조영진 ( Y J Cho ),최돈묵 ( D M Choi ),오부열 ( B Y Oh ),길경석 ( G S Kil ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 No.4
This paper describes electrical fire on residential environment such as apartment and detached house caused by defect of interior wiring. We carried out experimental study on short circuit characteristics by the interior wiring length We were measured arc current, arc energy and interrupting time of earth leakage current circuit breaker(ELB), when an interior wiring break out short circuit in residential environment. From the experiment results, the longer of the interior wiring, the magnitude of arc current decreased and the interrupting time of ELB increased. When applied the A maker`s ELB, the strength of arc current and interrupting time of ELB was 254 A and 245 ins respectively at 30 m interior wiring length, In 3 m interior wiring length, arc current and interrupting time was 716 A and 4.24 ins respectively. Arc energy was dependent on the magnitude of arc current and the interrupting time of ELB, the longer the interrupting time, arc energy increasing. In this paper, minimum arc energy was 277 J using C maker`s ELB and 3 m interior wiring length (arc current 283 A, interrupting time of breaker 6.28 ms). Therefore in the residential environment, short circuit caused by defect of the interior wiring lead to electrical fire.
송재용 ( J. Y. Song ),사승훈 ( S. H. Sa ),남정우 ( J. W. Nam ),김동환 ( D. H. Kim ),최영우 ( Y. W. Choi ),김진표 ( J. P. Kim ),고재모 ( J. M. Goh ),박남규 ( N. K. Park ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.3
We investigated the breakdown patterns of silica glass under the various impacts by forensic scientific analysis. The impacts were chosen by thermal and projectiles impact stress. Thermal impacts under the fire were constructed by changing the position of the flame with gas torches. Physical impacts were constructed with the projectiles of slingshots and rifles by changing the size of the projectiles at the surfaces and the initial distance. Also we identified incident angles of the projectiles by analysis of the punching portion at the glass surface. Under the thermal impacts, the breakdown patterns were various by changing the position of the flame. Especially, the configuration of breakdown patterns had radial shape with the position of the flame at the center of the glass sheet. Under the physical impacts by the projectiles, the breakdown patterns had always radial shape
지홍근 ( H K Ji ),김진표 ( J P Kim ),송재용 ( J Y Song ),최영우 ( Y W Choi ),박찬성 ( C S Park ),박남규 ( N K Park ),길경걱 ( G S Kil ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.5
This paper dealt with melting characteristics of low-voltage miniature cartridge fuse used for 220 V electronic equipment. The experimental sample is low-voltage miniature cartridge fuse with rating of 250 V(3A) and size of 5x20 mm. In order to evaluate melting and scattering characteristics of the fuse, we applied to 8/20 us surge current, overload current and external thermal stress such as flame of fire. From the experimental results, the fuse element was melted and scattered by applied surge current(above 0.79 kA) end overload current(above 4.5 A). It was also attached to the inner surface of the fuse tube. The fuse element was attached as a thin film on inner sur-¬face or fuse tube when large surge current was applied. It was confirmed, however, the fuse element was not changed by external thermal stress such as flame and hot-air.
이상민(S.M. Lee),김진표(J.P.Kim),박윤옥(Y.O.Park),김중배(J.B.Kim),안대영(D.Y.Ahn),최창열(C.Y.Choi) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.2B
본 논문은 디스크 어레이에서 패리티 계산을 빠르게 하고, 디스크 접근 횟수를 감소시키는 데이타 및 패리티 캐쉬의 구조와 관리 방법을 제안하였다. 다양한 RAID 레벨들이 동시에 지원되도록 데이타 캐쉬가 할당되어 서로 독립적으로 관리되고, 데이타 캐쉬와 별도로 패리티 캐쉬를 구성하여 독립적인 경로를 통한 동시 접근으로 패리티 계산 속도의 향상과 데이타 캐쉬 성공률(cache hit rate)의 저하를 방지하는 구조로 설계하였다. 패리티 계산을 위한 패리티 엔진(parity engine)을 하드웨어로 지원하여 패리티 연산 시간이 감소되고 디스크 접근 횟수를 줄일 수 있음을 확인하였다.
김의수 ( E. S. Kim ),심종헌 ( J. H. Shim ),김진표 ( J. P. Kim ),박남규 ( N. K. Park ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.3
The gas leak and explosion accident is able to give a fatal injury to nearby people from the explosion center and interest in effect of the explosion on the human body is increased. Accidents by Portable Butane Gas Range of a gas explosion accident occupy the most share. As a result, the injury on the human body frequently occur. However, It is situation that are experiencing difficulties in consequence analysis of explosion accidents owing to shortage of explosion power data and lack of research on the effect of the human body by the gas explosion. This paper acquire human injury data by performing the actual explosion experiment with Portable Butane Gas Range and evaluate power by explosion and effect of explosion on the human body to perform explosion simulation with LS-DYNA program. It is intended to contribute to the exact cause of the accident investigation and the same type of accident prevention.