• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.264.2-264.2
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• 2014

비휘발성 메모리는 전원이 공급되지 않아도 저장된 정보를 계속 유지하는 메모리로써 현재 다양한 차세대 전자소자의 집적화 구현을 위해 저전압 동작 및 저장능력의 향상 등에 대한 연구가 활발히 진행되고 있다. 이때 삽입되는 전하저장층의 경우 기존 널리 이용되는 질화막(SiNx) 외에 최근에는 산화 알루미늄(Al2O3) 등의 고유전상수 물질 뿐만 아니라, 밴드갭 조절을 통해 전하저장능력을 향상시키는 산화막(SiOx)에 대한 연구도 진행 중이다. 이번 연구에서는 전하저장능력을 향상시키기 위해 전하저장층으로 산화막을 이용할 뿐만 아니라, 기존의 평편한 구조가 아닌 표면 조절을 통해 전하저장능력을 보다 향상시키고자 한다. 또한 이번 연구에서는 비휘발성 메모리 소자의 응용을 위해 우선적으로 금속-절연체-반도체 형태의 MOOxOyS 구조를 이용하였다. 이 때 실리콘 표면적을 변화시키기 위해 이용된 실리콘 웨이퍼는 1) 평편한 실리콘, 2) 수산화암모늄, 이소프로필 알코올 및 탈이온수를 혼합한 용액에 식각시킨 삼각형 구조, 3) 불산, 질산 및 아세트산을 혼합한 용액에 식각시킨 라운드 구조이다. 정전용량-전압 측정을 통해 얻어진 메모리 윈도우는 1) 평편한 실리콘의 경우 약 5.1 V, 2) 삼각형 구조의 경우 약 5.3 V, 3) 라운드 구조의 경우 약 5.9 V를 얻었다. 이 때, 라운드 구조의 경우 가장 넓은 표면적으로 인해 상대적으로 전하트랩이 가장 많이 되어 메모리 윈도우가 가장 커지는 특성을 볼 수 있었다.

• 대한세포병리학회:학술대회논문집
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• 1992.06a
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• pp.21-22
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• 1992

• 대한족부족관절학회:학술대회논문집
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• 2008.11a
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• pp.43-43
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• 2008

• Proceedings of the KIEE Conference
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• 2004.10a
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• pp.31-33
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• 2004

In order to simulate the dynamic characteristics, we have developed a new method of calculating the torque of the flat-type vibration motor which is using 2D finite element model. We have measured the load torque of the vibration motor which is used for the dynamic characteristics analysis. The simulated vibration characteristic is compared with experimental value.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1994.10a
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• pp.860-865
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• 1994

공학 설계 과정을 묘사하는 설계 방법중의 한 가지인 구성 설계 방법론을 레이저 프린터의 급지 기구 설계에 적용하였다. 급지기구 부품들은 반송될 종이에 진동을 일으키지 않고 평편하게 유지하도록 설계되어야 한다. 설계방법과 경험들은 규칙으로 나타내고, 기능에 따라 프린터 급지 기구 내의 부품들은 객체로 표현하는 하이브리드 방식을 사용한다, 여러가지 설계 제한 조건들이 고려되므로 설계의 신뢰성이 개선될 수 있다.

• Journal of the Korean Geosynthetics Society
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• v.2 no.3
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• pp.19-24
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• 2003

Long-term performance of smooth and textured type HDPE geomembranes which were used to the liner and slope systems of waste landfills was examined. Artificial surface defects were added to the surface of geomembranes by scratch addition apparatus specially designed. The mechanical and frictional properties, chemical and ultra violet light resistances and oxidative induction time(OIT) of geomembranes were examined for the cases of defective/non-defective surfaces. Frictional properties of textured type geomembranes showed more excellent than those of smooth type geomembranes. Finally, it was known that the long-term performance of non-defective and textured geomembranes was better than that of defective geomembranes through chemical and UV resistance and OIT tests etc.

• Tribology and Lubricants
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• v.26 no.5
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• pp.297-302
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• 2010

This study is focused on the resin layer formation of UV imprinting process by changing imprinting pressure and period. The mold shape is made for the process of window open over the pattern transfer area and the imprinting period is assigned as the time just before the UV light curing. The residual layer is measured by changing the imprinting period and pressure magnitude, and the measured data of residual layer provides useful information for the design of the process conditions of imprinting processes.

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.4
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• pp.39-43
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• 1985

The charcterization of optical lithography on the step and repeat projection system is studied. Parameters that influence optical lithography were analyzed and the experiment was performed on the mask of $\pm$ 5rm, the surface flatness. From the experiment, the relationship between linewidth diviation on defocus and linewidth shift on exposure of the small features is obtained. Conditions maintaining good uniformity of small features from these relation-ships is presented.

• Journal of the Korean Society of Costume
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• v.44
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• pp.77-89
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• 1999

The present study aims at developing standardized patterns of ready-made Korean traditional costume for women in twenties and at suggesting classified standards so that consumers can buy high quailty clothes easily without dissatisfaction on unsuitable measurments. It was found from the dressing experiment results that new-concept patterns of Korean jackets onsidering women's bodies were seriously required because jackets fabricated by conventional patterns were not properily fitted to their bodies. During the processes of patten development, dressing experiment, and subsequent pattern adjustment, measurment standards classified by women's bodies were established, and new standardized patterns were developed in accordance with characteristics of women's bodies. These findings suggested that future studies on the pattern modification should be achieved continuously in consideration of ages, tastes, and fashions of modern women consumers.

• Proceedings of the KIEE Conference
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• 1998.11a
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• pp.10-12
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• 1998

Pumping liquid metal in nuclear power plant application by conventional centrifugal pumps pose difficulties such as bearing wear out at high temperatures and leak proof sealing of the liquid metal. MHD machine is obtained by replacing solid conducting secondary of conventional motors with ionized gas or liquid metal. It is used for reactor cooling pump because of construction simplicity, perfect sealing and easy operation/maintenance MHD pump is complicated because it includes electromagnetic and hydrodynamic phenomena. The principle of MHD Pumps is described in this paper. We design small laboratory size Flat Linear Induction Pump(FLIP) for transferring sodium.