• 한국시뮬레이션학회논문지
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• 제11권3호
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• pp.49-58
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• 2002

It takes 2 or 3 months to manufacture memory device. Defect has to exist owing to hundreds of processes. If there are too many defects, the memory has to be rejected. But if there are a few defects, it will be more efficient and cost reducing for the company to use it by repairing. Therefore, laser-repair process is needed for such a reason and redundancy analysis is needed to establish correct target of laser-repair process. The equipment development company had provided the redundancy analysis and each development company had developed and provided separately. So, to analyze the similar type of defects, redundancy analysis time can be very different by the manufacture. The purpose of this research is to strengthen the competitive price and to apply correlation concept in business for reducing the redundancy analysis time to repair the defects

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2001년도 The Pacific Aisan Confrence On Intelligent Systems 2001
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• pp.393-399
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• 2001

The Purpose of this paper is how KM is implemented and executed to reform the organization in the change management aspect and how its current KM can be developed in the future, mainly based on the organizational system, business process, and information system related to KM. This Paper is longitudinal case study of Knowledge Management at LG-EDS Systems. The effective approach to undertake KM is phase. First, it is structured to share explicit knowledge for better performance and then implicit knowledge for best performance. But, This method had some limitations. So, LG-EDS systems integrated KMS-Knowledge Portal-to facilitate cooperation and improve contents quality.

• 한국발생생물학회지:발생과생식
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• 제10권3호
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• pp.203-209
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• 2006

Ethane 1,2-Dimethane sulfonate(EDS)은 Leydig cells(LC)만을 선별적 사멸을 유도하는 약물로서 가역적인 테스토스테론 결핍 흰쥐 모델을 만드는데 널리 사용된다. EDS 투여에 의해 유도된 'LC 녹아웃' 흰쥐의 경우 부정소와 저정낭과 같은 테스토스테론 의존성 부속 생식기관들의 급격한 무게 감소가 초래됨이 이전의 연구들에서 보고되었는데, 이러한 무게 감소의 상당 부분은 세포자연사에 의한 것으로 보인다. 본 연구는 흰쥐 부정소에서 세포자연사 관련 유전자들의 발현에 미치는 EDS 투여 효과를 조사한 것이다. 성숙한 수컷 흰쥐(SD strain, $300{\sim}350\;g\;B.W.$)에 EDS(75 mg/kg, i.p.)를 1회 복강주사하고 주사 후 0, 1, 2, 3, 4, 5, 6 그리고 7주가 경과한 날 희생시켰다. 희생 직후 조직 무게와 부정소 미부의 정자수를 측정하였다. 부정소로부터 total RNA를 추출한 후 세포자연사 관련 유전자들 가운데 bcl-2, bax, Fas 그리고 Fas ligand(Fas-L)의 발현 변화를 semi-quantitative RT-PCR로 측정하였다. 예상한 바처럼, 부정소 무게와 정자 수는 EDS 주사 후 $1{\sim}2$주 동안에 급격히 감소하였다. 이후 어느 정도 회복하였지만, 최종적으로 주사 후 7주경 부정소 무게(71%)와 정자 수(38%) 모두 최초 수준에는 미달하였다. 부정소에서의 bcl-2 전사 수준은 주사 직후부터 6주 후까지 지속되다가 주사 후 7주에 유의하게 상승하였다. 또한 bax 전사 수준은 주사 후 6주에 유의하게 감소하였으며 나머지 전 기간 동안에는 별다른 차이가 없었다. 한편 Fas 전사 수준은 EDS 주사 후 $1{\sim}2$ 주간 상승하였다가 주사 후 3주부터 정상 수준으로 감소하여 7주까지 지속되었다. 유사하게, Fas-L의 전사 수준도 주사 후 $1{\sim}3$주 동안 상승하였다가 주사 후 4주부터 정상 수준으로 복귀하였다. 본 연구의 결과는 EDS 주사가 흰쥐 부정소에서의 세포자연사 관련 유전자 발현을 유도할 가능성을 보여준 것이며, 특히 Fas와 Fas-L 유전자 활성이 초기 세포자연사 유도 과정에 중요하고, 그 결과로 부정소 무게 감소와 정자 수 감소가 초래되는 것으로 추정된다.

• 한국초전도ㆍ저온공학회논문지
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• 제11권1호
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• pp.49-54
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• 2009

This paper presents the numerical simulation results on the moving type electrodynamic suspension (EDS) simulator and static type EDS simulator using high-Tc superconducting (HTS) levitation magnet. The levitation force of the EDS system is formed by the reaction between the moving magnet and the fixed ground conductor. The possible two ways to simulate the EDS system were simulated in this paper by using finite element method (FEM). The first way was the moving type simulator which consists of the fixed HTS magnet and the moving ground conductor. The second way was the static type simulator which consists of the fixed magnet, the fixed ground conductor and the ac current supply system. To verify the characteristics of high speed EDS system with the moving type simulator heavy, large and fast moving ground conductor is needed. The static type simulator can get the characteristics of the high speed EDS system by applying equivalent ac current to velocity, therefore it does not need large moving part. The static type EDS simulator, which can consist of an HTS magnet, the fixed ground conductor(s), an AC power supply and the measuring devices, also test the effect of the shape of the ground conductor easily. The plate type ground conductor made stronger levitation force than ring type ground conductor. Although the outer diameter 335 mm ring type ground conductor (Ring3) was larger than the outer diameter 235 mm ground conductor (Ring2), the levitation force by Ring2 was stronger than that by Ring3. From the calculation results on this paper, the consideration of the magnetic flux distribution according to the levitation height should be included in the process of the ground conductor design.

• 한국산업보건학회지
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• 제25권3호
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• pp.294-300
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• 2015

Objectives: The aim of this study is to identify physicochemical properties such as chemical composition, size, shape and crystal structure of powder byproducts generated from a metallization process and its 1st scrubber in the semiconductor industry. Methods: Powder samples were collected from inner chambers during maintenance of the W-plug process equipment (using tungsten hexafluoride as a precursor material) and its 1st scrubber. The chemical composition, size and shape of the powder particles were determined by field emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM) equipped with an energy dispersive spectroscope (EDS). The crystal structure of the powders was analyzed by X-ray diffraction (XRD). Results: From the SEM-EDS and TEM-EDS analyses, O and W were mainly detected, which indicates the powder byproducts are tungsten trioxide ($WO_3$), whereas Al, F and Ti were detected as low peaks. The powder particles were spherical and nearly spherical, and the particle size collected from the process equipment and its 1st scrubber showed 10-20 nm (agglomerates: 55-90 nm) and 16-20 nm (agglomerates: 80-120 nm) as primary particles, respectively. The XRD patterns of the yellow powder byproducts exhibit five peaks at $23.8^{\circ}$ $33.9^{\circ}$ $41.74^{\circ}$ $48.86^{\circ}$ and $54.78^{\circ}$ which correspond to the (200), (220), (222), (400), and (420) planes of cubic $WO_3$. Conclusions: We elucidated the physicochemical characteristics of the powder byproducts collected from W-plug process equipment and its 1st scrubber. This study should provide useful information for the development of alternative strategies to improve the working environment and workers' health.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 추계학술대회 논문집
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• pp.307-310
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• 2009

Nowadays, the usage of high strength steel has been growing in automobile industry mainly as structural parts since for its lightweight and high strength properties the oil crisis happened. Owing to poor formability, complex-shaped high-strength steel components are invariably produced through hot press forming. The high-strength steel sheets are in so me instances used with an Al-Si-coating with a view to prevent scaling of components during hot press forming. How ever, friction and fracture characteristics of Al-Si-coated high-strength steel during hot press forming process have not yet been investigated. In this paper, the formed parts which were formed in hot bending process were investigated by using EDS. SEM and nano indenter in order to analysis the coating layer behavior.

• 한국산학기술학회논문지
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• 제18권4호
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• pp.608-613
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• 2017

본 연구에서는 저품위인 35wt% 금합금에 대해 80.0wt% 이상의 Au를 얻기 위한 건식 정련 공정을 제안하였다. Au35wt%-Ag5wt%-Cu60wt%의 조성을 가진 금합금에 대해 PbO/(PbO+CaO)의 혼합비를 각각 0~1로 변화시키고 플럭스/금합금의 무게비는 1/2로 하여 $1200^{\circ}C$-5시간의 열처리를 진행하였다. 이때 공정 전, 후 시료의 조성 변화는 energy dispersive X-ray spectroscopy(EDS)로 확인하고, 공정이 완료된 후 분리된 플럭스 금속 원소 성분은 time of flight secondary ion mass spectromerty(ToF-SIMS)로 확인하였다. EDS분석 결과 플럭스의 비율이 1(PbO 단일)인 경우 Au의 함량이 35.0wt%에서 86.7wt%로 가장 크게 향상되었고, 다른 플럭스 조성의 경우도 84wt% 이상으로 정련이 가능하였다. 또한 2/3 혼합비의 플럭스에서 Ag가 플럭스부로 빠져나가는 손실이 가장 적었다. 플럭스부의 ToF-SIMS 분석 결과 플럭스의 비율이 1, 0 일 때 $Au^+$의 특성 피크의 강도가 각각 349, 37로 측정되었다. Au의 손실을 고려하였을 때 CaO 단일 플럭스의 사용이 더 유리할 수 있었으나, 이 정도의 신호강도는 무시할 수 있는 정도로 판단되었다. 따라서 혼합플럭스를 이용한 건식 열처리를 통해 효과적인 금의 정련이 가능하여 경제적인 습식제련의 전처리 공정으로 사용될 수 있음을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1159_1160
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• 2009

본 논문에서는 초고속 자기부상열차의 유력한 후보가 될 수 있는 초전도 반발식 자기부상의 특성을 연구하기 위한 반발력을 3차원 유한요소 자기 해석을 통하여 계산하고 분석하였다. 본 해석의 결과에 따르면 움직이는 부분이 없는 정지형 시험기는 반발식 자기부상시험기로써 적용될 수 있다.

• Applied Microscopy
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• 제45권3호
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• pp.131-134
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• 2015

Here we show how by processing energy dispersive X-ray spectrometry (EDS) data obtained using highly sensitive, new generation EDS detectors in the AZtec LayerProbe software we can obtain data of sufficiently high quality to non-destructively measure the number of layers in two-dimensional (2D) $MoS_2$ and $MoS_2/WSe_2$ and thereby enable the characterization of working devices based on 2D materials. We compare the thickness measurements with EDS to results from atomic force microscopy measurements. We also show how we can use electron backscatter diffraction (EBSD) to address fabrication challenges of 2D materials. Results from EBSD analysis of individual flakes of exfoliated $MoS_2$ obtained using the Nordlys Nano detector are shown to aid a better understanding of the exfoliation process which is still widely used to produce 2D materials for research purposes.

• 대한두개안면성형외과학회지
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• 제20권2호
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• pp.130-133
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• 2019

Ehlers-Danlos syndrome (EDS) is an inherited disorder of collagen biosynthesis and structure, characterized by skin hyperextensibility, joint hypermobility, aberrant scars, and tissue friability. Besides the skin, skeleton (joint) and vessels, other organs such as the eyes and the intestine can be affected in this syndrome. Accordingly, interdisciplinary cooperation is necessary for a successful treatment. Three basic surgical problems are arising due to an EDS: decreased the strength of the tissue causes making the wound dehiscence, increased bleeding tendency due to the blood vessel fragility, and delayed wound healing period. Surgery patients with an EDS require an experienced surgeon in treating EDS patients; the treatment process requires careful tissue handling and a long postoperative care. A surgeon should also recognize whether the patient shows a resistance to local anesthetics and a high risk of hematoma formation. This report describes a patient with a wide open wound on the foot dorsum and delayed wound healing after the primary approximation of the wound margins.