• 한국전기전자재료학회논문지
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• 제31권5호
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• pp.330-334
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• 2018

With the development of the Internet of Things, the use of flexible displays has become widespread. In particular, the use of curved, bendable, and rollable displays is increasing. Flexible display production processes include various important components such as lamination material, flexible substrates, and adhesives. Among them, improvement of the lamination process comprises a large proportion of efforts for further development. In this paper, we attempt to improve the transmittance of the display substrate by performing a bubble removal process after adhesion. The transmittance of the glass substrate with the bubble removal process was 5~12% higher than that of the substrate without the bubble removal process. The fill-strength after the bubble removal process was improved by 21.4%, and the shear-strength was improved by 43.9%.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.101-102
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• 2011

The attraction force is an important parameter for permanent-magnet(PM) linear machines. This paper aims to analysis lumped magnetic circuit model of a magnetic levitation system. It accounts for the fringing effect and leakage flux which may greatly affect the accuracy of the analytical model for the optimal lumped magnetic circuit model. consequentially it will be able to apply to prospective permanent-magnet(PM) linear machines for accurate analysis.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 학술대회 논문집 정보 및 제어부문
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• pp.443-444
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• 2008

본 논문에서는 비행기 모델을 대상으로 invariance and immersion방법을 적용하여 비선형 제어기를 설계한다. 이 방법을 사용하면 추정오차에 대한 추정식 형태로 off-the-manifold 좌표축을 정의하고, dynamics를 구하고, 이로부터 파라미터 적응규칙을 유도한다. 제어기는 이와 관련된 파라미터로부터 선형 화하지 않고 직접 설정하며, 마지막으로 리아프노프 함수를 통하여 알고리즘의 안정성을 증명한다.

• 한국전자통신학회논문지
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• 제10권3호
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• pp.387-393
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• 2015

유한체위에서 ECC를 기반으로 하는 전자상거래 또는 비밀통신에서 송수신자가 서로 다른 기저를 사용하는 경우에는 기저변환으로 인한 통신지연이 발생하게 된다. 본 논문에서는 서로 다른 기저를 사용하는 H/W와 S/W 구현 시스템 사이의 비밀통신 또는 전자서명에 소요되는 기저변환의 횟수를 분석하여, 그로 인한 통신지연을 제거하기 위해서, All One Polynomial(AOP)을 사용하는 유한체위에서 하드웨어와 소프트웨어 구현 모두에 효과적이면서, 기저변환이 필요 없는 근점 기저를 소개하였다. 제안하는 근점기저를 사용한 곱셈기의 H/W 구현 결과, 삼항식과 다항식기저를 사용하는 곱셈기보다 연산 시간이 약 25% 감소하였다.

• 한국지능시스템학회:학술대회논문집
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• 한국지능시스템학회 2008년도 춘계학술대회 학술발표회 논문집
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• pp.233-236
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• 2008

Recently, the development and application of unmaned robots are increasing in various fields including surveillance and reconnaissance, planet exploration and disaster relief. Unmaned robots are usually controlled from distance using radio communications but they should be equipped with autonomous travelling function to cope with unexpected terrains and obstacles. This means that unmanned robots should be able to evaluate terrain's characteristics quantitatively using mounted sensors so as to traverse harsh natural terrains autonomously. For this purpose, this paper presents an algorithm for extracting terrain information from elevation maps as an early step of traversability analysis. Slope and roughness information are extracted from a world terrain map based on least squares method and fractal theory, respectively. The effectiveness of the proposed algorithm is verified on both fractal and real terrain maps.

• 반도체디스플레이기술학회지
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• 제13권3호
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• pp.21-25
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• 2014

The texturing is one of the most important processes for high efficiency crystalline silicon solar cells. The rear side flatness of silicon solar cell is very important for increasing the light reflectance and forming uniform back surface field(BSF) region in manufacturing high efficiency crystalline silicon solar cells. We investigated texturing difference between front and rear side of wafer by texturing of two adhered wafers. As a result, the flatter rear side was obtained by forming less pyramid size compared to the front side and improved reflectance of long wavelength and back surface field(BSF) region were also achieved. Therefore, the texturing of two adhered wafers can be expected to improve the efficiency of silicon solar cells due to increased short circuit current(Isc).

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2003년도 춘계학술발표논문집 (중)
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• pp.767-770
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• 2003

현재 사용되고 있는 ETCS(Electronic Toll Collection Services)는 충전식의 스마트 카드와 카드리더를 이용하여 필요한 정보를 읽음으로 인증 및 과금 결제를 처리하는 방식이다. 혀 방식은 스마트 카드 규격이 다양하여 사용자는 각 규격에 맞는 카드리더를 사용해야 한다. 게다가 충전식이기 때문에 매번 충전해야하는 불편함이 있다. 본 논문에서는 현 ETC(Electronic Toll Collection)시스템의 단점을 극복하고자 스마트 카드 대신 휴대폰과 WAP(Wireless Application Protocol) 서버를 사용하여 통행료 자동징수 시스템을 설계한다. 또한 휴대폰을 사용함으로써 ITS(Intelligent Transfer Service) 시스템과 별도로 지역적인 인증이 가능하여 인중절차를 간소화시킬 수 있으며, ITS 시스템의 부하를 줄일 수 있기 때문에 ETC시스템 처리속도 또한 증가시킬 수 있다.

• Journal of Information Technology Applications and Management
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• 제11권4호
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• pp.1-23
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• 2004

This study identifies communication patterns of groups using synchronous text communication medium for their group decision-making, and examines how these patterns are associated with creative solutions to problems. Our research suggests that certain communication behavior of groups, when appropriately organized, can be of help in enhancing creative production of outcomes. A qualitative study was conducted on communication patterns based on an analysis of text-based electronic conversation protocols. Specifically this research tried to overcome existing studies on electronic groups by focusing on interactive process of communication among participants. The major study conclusion; are: (1) The production of creative outcome may depend on the process or sequence of discussion among group members with synchronous text communication medium. That is, proper interactive responses and appropriate control of the discussion process are essential to obtain a high level of performance. (2) It is importantto make discuss rules based on meta-cognitive and interactive protocols in the early stage. Explicit rules relating to internal group processes as well as communication medium use are even more important to groups with electronic communication medium than face-to-face groups.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 추계종합학술대회 논문 초록집
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• pp.63-63
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• 2004

• 대한전자공학회논문지
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• 제24권1호
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• pp.115-122
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• 1987

In this paper, we proposed an improved weakly-coupled power divider(TAP UNIT) for CATV and/or MATV systems, by which the degree of freedom in design and density of coupling interval are signifcantly increased compared with the intrinsic one even though the turn ratios are still of discrete values. On the other hand, the new design theory of a generalized n-way power divider with arbitrary dividing ratios, for CATV and/or MATV systems, which consists of ideal multiwinding transformers and resistors only was presented. Since the circuit elements is not frequency dependent, the proposed power divider is to be of considerably broad bandwidth. Furthermore, the experimental verification has been achieved, and, hence, the validity of the design theory proposed here is confirmed.