• 마이크로전자및패키징학회지
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• 제6권2호
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• pp.1-12
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• 1999

Brown oxide and/or black oxide layers were formed on the surface of Cu-based leadframe by chemical oxidation of leadframe in hot alkaline solutions, and their growth characteristics were studied. Then, to measure the adhesion strength between leadframe and epoxy molding compound (EMC), oxidized leadframe samples were molded with EMC and machined to form sandwiched double-cantilever beam (SDCB) specimens and pull-out specimens, respectively. Results showed that the adhesion strength of un-oxidized leadframe/EMC interface was inherently very poor but could be increased drastically with the nucleation of acicular CuO precipitates on the surface of leadframe. The presence of smooth faceted $Cu_2O $ on the surfaces of leadframe gave close to zero interfacial fracture toughness (Gc) and reasonable pull strength (PS). A direct correlation between Gc and PS showed that PS can be a measure of Gc only in a limited range.

• 조명전기설비학회논문지
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• 제28권7호
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• pp.91-96
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• 2014

The requirements for separation between ICT cables and power cables depend upon the electromagnetic immunity of the ICT cable, the construction of the power cable, the quantity of, and type of electrical circuits and the presence of dividers etc. We studied and reviewed the regulations and standards relevant for requirements of this separation in domestic and foreign. And then we would like to suggest the method of separation calculation between ICT and power cabling taking the EMC into consideration.

• 한국표면공학회지
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• 제36권4호
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• pp.347-355
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• 2003

Roughening of metal surfaces frequently enhances the adhesion strength of metals to polymers by mechanical interlocking. When a failure occurs at a roughened metal/polymer interface, the failure prone to be cohesive. In a previous work, an adhesion study on a roughened metal (oxidized copper-based leadframe)/polymer (Epoxy Molding Compound, EMC) interface was carried out, and the correlation between adhesion strength and failure path was investigated. In the present work, an attempt to interpret the failure path was made under the assumption that microvoids are formed in the EMC as well as near the roots of the CuO needles during compression-molding process. A simple adhesion model developed from the theory of fiber reinforcement of composite materials was introduced to explain the adhesion behavior of the oxidized copper-based leadframe/EMC interface and failure path. It is believed that this adhesion model can be used to explain the adhesion behavior of other similarly roughened metal/polymer interfaces.

• 한국전자파학회지:전자파기술
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• 제25권1호
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• pp.19-28
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• 2014

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 1999년도 추계 기술심포지움 논문집
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• pp.85-88
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• 1999

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 1998년도 춘계학술발표회 초록집
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• pp.71-72
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• 1998

• 한국ITS학회 논문지
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• 제3권2호
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• pp.119-128
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• 2004

최근 해상을 통한 선박의 교통량 증가와 선박의 디지털화로 인한 오동작으로 인해 해상에서 발생되는 사고가 증가하고 있다. 이에 따라 항해 안전에 관련하여 선박탑재용 장비에 대한 IMO(국제해사기구)의 결의에서 2002년 7월 1일 이후 건조되는 선박 선교에 대해서 SOLAS 협약에 의해 무선통신, 항해 관련기기에 대한 전자파장해 방지 및 내성의 규격을 강제 적용하고 있다. 본 논문에서는 선박의 기초적인 EMC 환경 조사의 필요성을 인지하고 선박의 EMC 환경 조사를 위해 한국해양대학교 실습선인 한바다호를 대상으로 측정하였다. 측정 장소는 실습선의 Bridge와 Engine Control Room이고 Test Point를 설정하여 측정하였다. 측정주파수 대역은 30MHz$\~20$Hz이고 편파 측정은 수평편파와 수직편파에 대해서 측정하였다. 측정된 결과값을 IEC에서 규정된 허용기준을 고려하여 선박의 EMC 환경을 분석하였다.

• 한국융합학회논문지
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• 제7권6호
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• pp.23-28
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• 2016

본 연구에서 전력 변환 회로의 전자파적합성(EMC: Electromagnetic Compatibility)에 관한 설계 및 측정 결과를 제시하고 있다. 태양광 에너지 저장 장치에 주로 사용되는 LT3652 칩을 사용한 DC-DC 전력 변환 회로가 설계되어 제작되었다. 제작된 회로를 이용하여 원거리 방사, 근거리 전도성 및 복사성 방출에 대한 시뮬레이션이 ANSYS SIwave로 수행되었으며 결과가 제시되었다. 본 연구에서 불필요한 방사를 최소화하기 위해 콘덴서와 접지 포스트가 추가된 회로를 사용하였다. 전도 및 방사 방출은 CISPR 22의 표준화 된 시험 절차에 따라 EMC 전용무반사실에서 측정되었다. 개선된 회로를 사용하여 측정된 데이터를 제시하였고 개선 전후의 값들이 비교되었다. 제시된 결과를 보면 EMI 감소 기술이 적용된 회로에서 원치 않는 방출이 크게 감소하는 것을 보여주고 있다. 여기서 제안 된 결과는 전력 컨버터 모듈의 설계에 효율적으로 적용 가능한 기술이다.

• 한국물환경학회지
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• 제22권2호
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• pp.294-299
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• 2006

The Ministry of Environment in Korea has introduced Total Pollution Load Management System (TPLMS) in major 4 large rivers to protect the water quality from possible pollutants. In order to successfully achieve the TPLMS, the nonpoint source should be controled by applying the best management practices in highly polluted areas. Of the various nonpoint sources, the highways are stormwater intensive landuses because of its high imperviousness and high pollutant mass emissions. The EMC (Event Mean Concentration) is an important parameter to correctly determine the pollutant mass loadings from nonpoint sources. However, it has wide ranges because of various reasons such as first flush phenomenon, rainfall and watershed characteristics. Even though the EMC is closely related to the first flush phenomenon, the relationship have not proven until present. Therefore, in this paper, the dynamic EMC method will be introduced to clearly make the relationship between EMC and first flush phenomenon. Also by applying the dynamic EMC method to monitored data, we found that the highly concentrated stormwater runoff was washed off within 20~50 minutes storm duration. The first flush criteria for economical treatment was also determined to 5~10 mm (mean=7.4 mm) as a cumulative rainfall.

• 한국물환경학회지
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• 제25권4호
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• pp.615-623
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• 2009

The research of the determination of event mean concentration (EMC) was focussed combined sewer overflows and highway runoff in korea. But those of non-urban areas are few. In this study, EMC and unit loading on land use types in Nogok watershed were estimated by runoff loading of non-point source (NPS) on non-urban area. Two monitoring sites were equipped with an automatic velocity meter, flow meter, and water sampler. Monitoring was conducted at two monitering site during the rainy season. The results show that the EMC ranges in forest land use are 1.3~2.6 mg/L for BOD, 2.0~16.1 mg/L for SS, 0.1~2.1 mg/L for TN, and 0.12~0.49 mg/L for TP. The unit loading of NPS in this study was difficult to compare directly with that used conventionally because of the difference of field investigation. In near future, it needs to conduct more systematic and long-term research about NPS within the watershed. The results of this research can be used to estimate the total pollution load management system (TPLMS) program in korea.