• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.494.1-494.1
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• 2014

태양광은 세계적으로 유망한 에너지 중의 하나이며, 태양광 모듈은 실제 옥외 조건에 따라 다르지만 장기 신뢰성과 수명을 보장하기 위해 최소 20년 이상을 안정적으로 작동될 필요성이 있다. 하지만 실제 태양전지는 옥외에 장기 노출됨에 따라 성능이 저하되며, 그 원인으로는 셀 균열, 부식, 접착 강도 손실 및 박리, 그리고 변색 등이 있다. 본 논문에서는 부식으로 인한 성능 저하를 완화하기 위해 희생금속을 이용하여 태양전지 모듈의 성능 향상에 대해 연구하였다. 태양전지는 4 cell 결정질 실리콘 태양전지 미니 모듈을 이용하였고, 희생금속의 영향을 확인하기 위해 두 종류의 시료를 준비하였다. 한 시료에는 Al 희생금속을 태양전지 리본 위에 부착하였으며, 나머지 한 시료는 비교 시료로 Al 희생금속을 부착하지 않았다. 시료는 $85^{\circ}C$ 85%의 상대습도인 고온고습 조건에서 2500시간을 진행하였다. 그리고 2500시간의 고온고습 시험이 진행된 시료의 전기적 특성을 분석하였다. 시험 결과, 희생금속이 없을 경우 28.8%의 출력 저하가 있었으며, 희생금속이 있을 경우 19.3%의 출력 저하가 확인되었다. 또한, 희생금속이 없을 경우, 충실도는 21.5% 감소하였으며, 단락전류 역시 약 6% 정도 감소하였다. 반면, 희생금속이 있을 경우, 충실도는 16.1%로 감소하였고, 단락전류는 거의 변화가 없었다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.5 no.1
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• pp.19-29
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• 2002

In this paper, the selection of transport route for import-export container cargo based on the sacrifice model and CO₂ emission was investigated. At first, the transportation of import-export container cargo, the transport share of each transport route, the CO₂ gas emission, the sacrifice model and the time value of import-export container cargo were investigated. And next, the selection of transport route based on the sacrifice model was investigated for the transport of import-export container cargo from Seoul to Pusan Port. Finally, the transport route was also selected by using the sacrifice model including the effect of CO₂ emission. The research results show that the transport route selection results of import-export container cargo based on the sacrifice model represents the present status of the transportation of import-export container cargo very well. And also the research results show that the reduction of transport time was very effective to increase the share of coastal transportation.

• Journal of the Korea Institute of Building Construction
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• v.10 no.5
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• pp.21-29
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• 2010

Cathodic Protection has been introduced as a method of protecting metals under the ground or sea from corrosion. Since 1970, it has been applied to reinforced concrete structures as a corrosion protection method. After 1990, it became used around the world, and its usability has been well confirmed. But this method has some problems in terms of construction and economy. To solve these problems, a Cathodic Protection Method using a highly-durable metal spray was developed. First, the specimen was covered with anodic materials (Zn, Al) by using metal spray. The corrosion protection performance was confirmed by measuring the corrosion current of the specimen. Through the experiment, it is possible to confirm that the Cathodic Protection Method using a high metal spray provides effective protection against corrosion to reinforced concrete structures.

• Journal of Sensor Science and Technology
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• v.8 no.5
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• pp.414-420
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• 1999

The oxide sacrificial layer technology is one of the key technologies in surface micromachining. However, the commonly used aqueous HF solutions, including the $NH_4F$ buffered HF solutions (BHF), are known to attack the Al metal layers during the oxide sacrificial etch. A mixed $NH_4F$/HF/glycerine aqueous solution of 4:1:2 ratio is known to have the best etch selectivity between oxide and AI, but even this sacrificial etchant has a significant etch rate for AI. This paper reports an extensive experimental study on various concentration ratios for HF, $NH_4F$ and glycerine, and develops the optimal mixture ratio for sacrificial etching. At the $NH_4F$/HF/glycerine ratio of 2:1:4, the etch selectivity between PSG and Al improves by approximately 6 times over the previously known best selectivity, to a value of 7,700. At this condition, the measured etch rate of PSG film is approximately $2.1\;{\mu}m/min$, which is sufficiently fast. The developed sacrificial etchant allows the addition of a Al metal layer in surface micromachining, without the worry of Al layer erosion during sacrificial etch.

• The Journal of the Convergence on Culture Technology
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• v.5 no.4
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• pp.367-371
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• 2019

In this study, we proposed the sacrificial anode cathodic protection method as a countermeasure to reduce the corrosion of railway rails under oceanic climatic conditions and proved the anticorrosive effect experimentally. In addition, the proposed sacrificial anode cathodic protection method were tested on site to examine long-term rail corrosion monitoring and field applicability for more than 26 months and to prove the effectiveness of rail corrosion. As a result of monitoring the corrosion state using the cellophane tape method, the appearance of the applied sections with sacrificial anode cathodic protection method was good at the present time about 26 months after the field test laying, and no abnormalities and other abnormalities of the rail welded section and the rail web were found. Hence, in places where no sacrificial anodes were installed, rust progressed rapidly. In addition, the proper spacing of sacrificial anodes was found to form the most stable corrosion coating at 1.0 ~ 1.5m. After about 26 months of monitoring, the installation of sacrificial anodes could help stabilize the overall rail corrosion level, even if the spacing was somewhat wider.

• Product Safety
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• s.191
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• pp.28-31
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• 2009

우스갯소리로 한집 건너 한집에는 보유하고 있다는 스팀청소기, 스팀청소기 없는 집이 없을 정도로 주부들의 살림리스트에 스팀청소기는 필수품이 되었다. 그 중 스팀청소기 전체시장 점유율 70%을 차지하고 있는 한경희생활과학은 스팀청소기의 대표 아이콘이다. 이제 한경희생활과학은 국내뿐 아니라 세계를 제패하는 챔피언으로 또한 세계시장에서는 'HAAN'으로 재주목받고 있다. 스팀청소기 이름도 자신의 이름을 따 '한경희 스팀청소기'가 주부인 한경희 대표가 직접 이 제품을 개발했다는 얘기를 들으면, 이 정체불명의 아줌마에 대해 궁굼해지기 시작한다. 도대체 뭐하던 사람이길래?

• Journal of Sensor Science and Technology
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• v.5 no.1
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• pp.71-77
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• 1996

Considering that polycrystalline silicon, a structural material of the micromachining, is affected by a sacrificial oxide layer, the poly-oxide obtained by the thermal oxidation of polycrystalline silicon is newly proposed and estimated as the sacrificial oxide layer. The grain size of the polycrystalline silicon grown on the poly-oxide is larger than that of poly crystalline silicon grown on the conventional sacrificial oxide layer. As a result of XRD, increase of (111) textures and formation of additional (220) textures are observed on the polycrystaIline silicon deposited on the poly-oxide. Also, the polycrystalline silicon grown on the poly-oxide represents small and uniform stress.

• KOREAN POULTRY JOURNAL
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• v.14 s.149
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• pp.115-117
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• 1982

채란양계는 지난 3년간 악성적인 불황으로 많은 농가가 도산의 위기에 처해 있다. 생산자는 그 돌파구를 찾고저 수매비축, 적자수출, 사회여론에 호소 등 모든 방법을 강구하고 있으나 근본적인 해결방법은 되지 못하고 있다. 채란업계의 활성화를 위해서는 무엇보다도 먼저 생산자가 한데 모여 단합된 힘으로 뭉쳐 여론을 하나로 통일하는 것이 중요할 것이다. 한알의 밀알이 땅에 떨어져 썩어지면 새싹이 나와 자라서 60배, 100배의 열매를 맺지만 썩지 않으면 밀알 하나 그대로 있는다는 성구의 만고 불변의 진리는 우리 모두가 너무도 잘 알면서도 실제 자기 희생이 따르는 썩어지는 아픔을 감당하기를 회피하는 것이 보통 사람들의 일반적인 통례라 하겠다. 우리 나라에서 계우회중 가장 규모가 큰 채란 양계업자의 모임인 한국계우회는 고태영회장을 정점으로한 회장단 운영위원들이 우선 각자 한알의 밀알이 되어 희생을 감수하기로 하고 1억2천만원의 자금을 모아 계란의 비축으로 공급량을 조절하기 시작하였다. 계란의 비축은 정부나 축협에서도 사업의 특수성 때문에 감히 손을 대지 못하여 왔는데 이번 이러한 희생정신으로 비축사업이 시작되었다. 이제 생산자들의 희생으로 새싹이 나왔으니 업계는 물론 모든 유관기관 단체 정부에서까지도 많은 열매를 맺을 수 있도록 가꾸고 길러 주어야 할 것이다.

• Journal of Energy Engineering
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• v.23 no.3
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• pp.21-26
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• 2014

EU-APR1400, the Korean nuclear reactor design for European market adopts a so-called core catcher for ex-vessel molten corium retention and cooling as a severe-accident mitigation system. Sacrificial material, which controls melt properties and modifies melt conditions favorable for corium cooling and retention, is usually employed to protect core catcher body from molten corium. Since molten corium can be ejected through a breach of a reactor pressure vessel and impinged on the sacrificial material with enhanced heat transfer at a severe accident, it is very important to predict ablation rate of sacrificial material due to corium jet impingement accurately for core catcher design. In this paper, sacrificial-material ablation model based on boundary layer theory is suggested and compared with the experimental results by KAERI.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.3
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• pp.681-686
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• 2017

Degradation is commonly observed in field-aged PV modules due to corrosion of the photovoltaic ribbon. The reduced performance is caused by a loss of fill factor due to the high series resistance in the PV ribbon. This study aimed to mitigate the degradation by corrosion using five sacrificial anodes - Al, Zn and their alloys - to identify the most effective material to mitigate the corrosion of the PV ribbon. The corrosion behavior of the five sacrificial anode materials were examined by open circuit potential measurements, potentiodynamic polarization tests, and galvanic current density and potential measurements using a zero resistance ammeter. Immersion tests for 120 hours were also conducted using materials and damp heat test tests were performed for 1500 hours using 4 cell mini modules. The Al-3Mg and Al-3Zn-1Mg sacrificial anodes had a low corrosion rate and reduced drop in power, making then suitable for long-term use.