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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
송재용(J. Y. Song),길경석(G. S. Kil),신광철(G. C. Shin),박종국(J. K. Park),심재원(J. W. Sim) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, a ubiquitous sensor for condition monitoring of insulators and lightning arresters installed in power distribution lines and electric traction vehicles is presented. The sensor consists of two parts; a leakage current measurement and a lightning surge detection. Measured data are transmitted to a supervisory computer through ZigBee protocol based on IEEE 802.15.4. To detect leakage current, a window type Mn-ZCT is used and a low-noise amplifier with a gain of 60 ㏈ is designed, and this can measure leakage current in ranges of 100 ㎂ ~ 5 ㎃. A sample-hold (S/H) and a Rogowski coil are injected to analyze the magnitude of surge current in ranges from 500 A to 10 ㎄ with 8/20 ㎲-waveform.
강자성체 박막(Fe-Ni, Co-Ni)의 자기-저항 효과에 관한 연구( I )
장충근,유중열,송재용,윤만영,박재형,손대락,Chang, C.G.,Yoo, J.Y.,Song, J.Y.,Yun, M.Y.,Park, J.H.,Son, D.R. 한국센서학회 1992 센서학회지 Vol.29 No.3
자기-저항 센서를 제작하기 위하여 Fe-Ni 합금과 Co-Ni 합금을 슬라이드 그라스와 Si wafer에 진공 증착하여 sensor element를 제작한 후 포화자속밀도($B_{s}$), 보자력($H_{c}$), 자기-저항 변화율 등을 조사하였다. 진공 증착된 Fe-Ni 합금 박막의 포화자속밀도는 0.65T이었으며 자화주파수 1 kHz에서 보자력은 0.379A/cm이었고 자냉처리 후 종방향 보자력은 0.370Acm(//), 횡방향 보자력은 0.390Acm(${\bot}$)로 변화되었다. 자기-저항 변화율은 박막의 산화로 인하여 매우 불안정하였다. 진공 증착된 Co-Ni 박막의 포화자속밀도는 0.66T이었으며 자냉처리 후의 종방향 보자력은 5.895Acm(//)이었고 횡방향 보자력은 5.898A/cm(${\bot}$)이었다. 한편 자기-저항 변화율(${\Delta}R/R$)은 $3.6{\sim}3.7%$로써 실온에서 매우 안정하였다. Fe-Ni 박막은 화학친화력이 강하여 자기-저항 센서 제조 공정에서 많은 문제점을 야기시키고 있으나, Co-Ni 박막은 화학친화력이 작고 자기-저항 효과가 뚜렷하여 고온용 자기-저항 소자 개발용 재료로 매우 적합할 것으로 사료된다. In order to fabricate magnetoresistive sensor, Fe-Ni and Co-Ni alleys were evaporated on the slide glass and the silicon wafers. Saturation magnetic induction($B_{s}$), coercive field strength($H_{c}$) and magnetoresistance were measured for fabricated samples. The evaporated Fe-Ni thin films show that the saturation magnetic induction was 0.65 T, and coercive field strength was 0.379 A/cm, and this value was changed to 0.370 A/cm(//), 0.390 A/cm(${\bot}$), respectively after magnetic annealing. For the measurement of coercive field strength, magnetizing frequency of 1 kHz was used. For the fabricated sensor element, the change of magnetoresistance (${\Delta}R/R$) was excessively unstable due to oxidation in the process of fabrication. The evaporated Co-Ni alloy thin films show that saturation magnetic induction was 0.66 T, and coercive field strengthes were 5.895 A/cm(//), 5.898 A/cm(${\bot}$), respectively, after magnetic annelaing. The change of magnetoresistance(${\Delta}R/R$) was $3.6{\sim}3.7%$ of which value was excessively stable to room temperature. Fe-Ni thin film could have many problems due to large affinity in the process of fabrication of magnetoresistance sensor, but Co-Ni thin film could be a suitable material for fabrication of magnetoresistance sensor, because of its small affinity and definite magnetoresistance effects.
강자성체 박막 ( Fe-Ni , Co-Ni ) 의 자기 - 저항 효과에 관한 연구 ( 1 )
장충근,유중열,송재용,윤만영,박재형,손대락 ( C . G . Chang,J . Y . Yoo,J . Y . Song,M . Y . Yun,J . H . Park,D . R . Son ) 한국센서학회 1992 센서학회지 Vol.1 No.1
In order tp fabricate magnetoresistive sensor, Fe-Ni and Co-Ni alloys were evaporated on the slide glass and the silicon wafers. Saturation magnetic induction(Bs), coercive field strength(H) and magnetoresistance were measured for fabricated samples. The evaporated Fe-Ni thin films show that the saturation magnetic induction was 0.65 T, and coercive field strength was 0.379 A/cm, and this value was changed to 0.370 A/cm(//), 0.390 A/cm(⊥), respectively after magnetic annealing. For the measurement of coercive field strength, magnetizing frequency of 1 kHz was used. For the fabricated sensor element, the change of magnetoresistance (△R/R) was excessively unstable due to oxidation in the process of fabrication. The evaporated Co-Ni alloy thin films show that saturation magnetic induction was 0.66 T, and coercive field strengthes were 5.895 A/cm(//), 5.898 A/cm(⊥), respectively, after magnetic annelaing. The change of magnetoresistance(△R/R) was 3.6∼3.7% of which value was excessively stable to room temperature. Fe-Ni thin film could have many problems due to large affinity in the process of fabrication of magnetoresistance sensor, but Co-Ni thin film could be a suitable material for fabrication of magnetoresistance sensor, because of its small affinity and definite magnetoresistance effects.