• 한국전기전자재료학회논문지
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• 제22권8호
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• pp.625-631
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• 2009

In this thesis, lateral thermosonic bonding with ACFs was investigated as a process to make high reliability joints for FPD fabrication. Conditions for thermosonic and thermocompression bonding with ACFs were determined and used to make specimens in a driving test jig for testing of bond reliability by thermal shock. The results showed that thermosonic bonding temperature of $199\;^{\circ}C$ and bonding time of 1s produced bonds with good reliability. Additionally, thermosonic bonding temperature and time were reduced and thermal shock test results compared to this proposed curing condition. It is concluded that theromosonic bonding with ACFs can be effectively applied to reduce bonding temperature and time compared with that of thermocompression bonding.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.2216-2217
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• 2008

This paper write about earth system for the prevention electric shock and a protection of equipment in england. The IEC60364 and BSI(British Standards Institution) define earthing method(IT, TT, TN-C, TN-S, TN-C-S)-BSI is british standards and in case of england almost use the TN system. TN system can classify TN-S & TN-C-S(PME). The findings on survey in england are used the TN-S system and TN-C-S system about 70% and residue 30% are used TT system and IT system from the exiting state of things.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1453-1454
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• 2007

A street light is an electrical equipment to improve the traffic safety and the security for people in night. However, many accidents due to electric shock have happened in recent, people were interested in the safety of electrical facilities. And people want to know the danger by touch and step voltages. When the electric power lines fall down on the ground, the fault current flows to ground rod and the potential near the ground rod is increased to induce the high touch and step voltages. In this paper, we installed different ground rods with a street light and investigated the electrical potential according to ground methods and the types of ground rod. Finally, we examined the electrical facilities with the experimental result and present the improved technical data for the safety from electric shock

• International Journal of Naval Architecture and Ocean Engineering
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• 제12권1호
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• pp.479-490
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• 2020

The hydrodynamic characteristic of transonic motion projectiles with different head diameters are investigated by numerical simulation. Compressibility effect in liquid-phase water are modeled using the Tait state equation. The result shows that with increasing of velocity the compression waves transfer to shock waves, which cause the significant increasing of pressure and decreasing the dimensions of supercavities. While the increasing of head diameter, the thickness, the vapor volume fraction and the drag coefficient of supercavities are all enhanced, which is conducive to the stability of transonic-speed projectiles. The cavity dynamics of the different head projectiles are compared, and the results shows when Mach number is in high region, the truncated cone head projectile is enveloped by a cavity which results in less drag and better stability.

• 전기학회논문지
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• 제65권10호
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• pp.1767-1773
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• 2016

Every year, lives are lost due to electrical safety accidents that could have been prevented with proper education and awareness of electrical safety. To prevent such accidents, experiential education is more effective than indoctrination education. This paper describes the electrical safety education system based on virtual reality (VR) and evaluates effect of the proposed system. Users operated the experiential electrical safety education system, and they were provided electrical stimulation in an electric shock experience using a haptic device. Appropriate stimulation values were calculated according to age (children vs. adults) and gender through experiment. The scenario in which participants experience electrical safety in the home environment was structured, and related educational contents was produced. A total of 68 healthy elementary students evaluated the educational effect of the system. The results showed that the educational effect and the sustainability of effect of the proposed system are superior to those of existing multimedia learning methods. By implementing electrical safety education stimulating the senses of human, the learning effect was promoted and this experiential education would be able to prevent electrical accidents.

• 전기저널
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• 1호통권85호
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• pp.46-50
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• 1984

• 전기학회논문지P
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• 제56권4호
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• pp.195-200
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• 2007

This paper describes the countermeasures for preventing the electric shock which can be occurred in the low-voltage handhole underwater. Low-voltage handholes were designed and made for the test in the testing field. Which were installed 4 cases. a metal handhole cover was employed in case 1; FRP(Fiber glass Reinforced Plastic) handhole cover in case 2; an insulated rubber was put on the joint of the cables in case 3; the exposed conductors(cover, frame etc) were commoned and grounded in case 4. Thus, an ground potential near the low-voltage handhole was measured and evaluated quantitatively for the 4 cases. The measured results show that the potential of case 2.3 were lower than that of case 1 because the insulated rubber and the FRP cover prevented direct contact to the fault point. The case 4 is the lowest among the 4 cases because the common and grounding helps the fault current release into the ground, which makes the ground potential rise lower. As a result, although each case has the defects, these ways can effectively lower the electric shock risk in the low-voltage handhole.

• 한국전기전자재료학회논문지
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• 제29권3호
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• pp.152-158
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• 2016

The bonding characteristics of MLCCs (multi layer ceramic capacitor, C1608) lead-free solder (SAC305) joints were evaluated through thermal shock test ($-40^{\circ}C{\sim}125^{\circ}C$, total 1,800 cycle). After the test, IMCs( intermetallic compounds) growth and cracks were verified, also shear strengths were measured for degradation of solder joints. In addition, The thermal stress distributions at solder joints were analyzed to compare the solder joints changes before and after according to thermal shock test by FEA (finite elements analysis). We considered the effects of IMCs growth at solder joints. As results, the bonding characteristics degradation was occurred according to initial crack, crack propagations and thermal stress concentration at solder-IMCs interface, when the IMCs grown to solder inside.

• 조명전기설비학회논문지
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• 제18권6호
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• pp.197-204
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• 2004

건설현장에서 공사기간 중 일시적인 전원공급을 위하여 사용되는 임시전력설비는 영구설비와 달리 최소한의 보호장치만을 구비하여 운용되는 설비로서, 산만한 작업환경, 전기설비의 재사용으로 인한 노후화 등의 불안요인에 의해 타설비에 비해 많은 감전위해요인을 나타내고 있다. 이에 임시전력설비의 감전위험요소를 분석하기 위해 수전 설비, 배ㆍ분전반 등에 대한 실태조사 및 설문조사가 병행하여 실시되었으며 관련 전문가, 연구원, 한국전기안전공사 기술자 등에 의해 전국적으로 실시되었다. 그 대상은 공항, 아파트, 시립운동장 등 다양하였다. 실태조사의 분석 결과 자물쇠장치의 불량, 충전부 방호의 미흡 등 문제점이 나타났으며 이를 해소하기 위해서는 관련 제도개선 안전교육, 안전점검 등이 이루어져야 한다. 향후 분석 자료는 건설현장에서의 감전사고를 방지하는데 활용될 수 있으며 전기설비를 안정화시키는데 이용될 수 있을 것이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2280-2283
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• 1999

Close to high power radio/radar transmitters, there is a possibility that electrical sparks may occur at discontinuities in metallic structures. If these structures are in an area where flammable mixtures are present, there is a danger that fire or explosion may happen by these sparks. Voltage may be induced on these metallic structures by the radio-frequency transmitter. In this case, a person who comes into contact with these structure may be undergone a severe electrical shock. In this paper, assessment of the these hazards was investigated through experimental and evaluation for actual tower cranes near AM radio transmitters.