• The Transactions of the Korea Information Processing Society
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• v.4 no.9
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• pp.2333-2341
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• 1997

The hyperlinks to related nodes should be changed when we insert, or modify an information in a hypertext database. We can find more informations by means of hyperlinks that are based upon hypertext indexes. Therefore, the management of the hypertext indexes is an important component for dynamic information storage. In this paper, we suggest a method to manage the hypertext indexes and to determine hyperlinks automatically by using a dynamic indexer. We also construct index, stopword, and postposition dictionaries, an inverted index file, and a thesaurus to help the dynamic indexer.

• 한국전산유체공학회:학술대회논문집
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• 2005.04a
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• pp.104-108
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• 2005

The Korean high speed train runs at 300 km/h, ballast-flying phenomenon often happens by strong train-wind. It is important to consider the prevention of ballast-flying phenomenon, because the train under-body and fares or walker around a rail might be damaged. In this study, Numerical analysis of the flow field of under-body of train and study of heighter-effect were conducted to decrease the speed of under-body. The shape of under-body was simplified for convenience of meshing and analysis. According to results of Taguchi's design by orthogonal arrays, a height of tie is dominant in the flow field, so if the heighter is installed on tie, the speed of under-body might be decreased. The result of this study is useful to build a new high-speed-line.

• 베이커리
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• no.10 s.339
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• pp.76-77
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• 1996

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.478-480
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• 1999

웹(WWW)기술은 기존 클라이언트 서버환경의 정보 시스템을 그대로 활용하면서 TCP/IP프로토콜을 이용하여 인터넷기반의 분산시스템 환경을 제공한다. 웹 어플리케이션을 개발할 경우 기존의 어플리케이션 개발방법과 더불어 하이터미디어 형식으로 개발되어 지기 때문에 하이퍼어플리케이션 개발방법론의 적용이 요구되어진다. 그러나 단지 정보획득의 목적으로 사용되던 기존에 제안된 하이퍼미디어 개발방법론들을 웹 어플리케이션 개발에 그대로 적용하기는 미흡하다. 따라서 본문에서는 웹 어플리케이션 개발 과정중 논리적인 업무 프로세싱작업을 지원하면서 주요작업이 되는 하이퍼미디어 사용자 인터페이스 설계단계를 확장 지원하는 정보 구조 모델 방법론과 개발 프로세싱 절차를 제안한다.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2155-2157
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• 2003

본 논문에서는 동일동기화(Identical Synchronization)파 일반동기화(General Synchronization)를 이용한 하이퍼카오스 시스템을 구성하고 검증하였다. 단일 카오스 모듈을 이용한 통신은 많은 보안의 취약점을 가진 것으로 알려져 있다. 이에 이런 취약점을 보안하기 위해 여러 방법들이 도입되었다. 본 논문은 두 개의 2-double scroll Chua 회로와 두 개의 2-double scroll Chua 오실레이터를 이용하여 하이퍼카오스 회로의 송수신단을 구성하고 동기화 방법을 제안하였다.

• Polymer(Korea)
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• v.28 no.6
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• pp.531-537
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• 2004

Various half-ester acrylates were prepared from anhydrides and 2-hydroxyethyl acrylate. Photocurable epoxy modified acrylates were prepared from synthesized half-ester acrylate and neopentylglycol diglycidylether. Physical properties such as hardness, yellowing, tensile strength and elongation were tested and compared as the structure of oligomer in cured-film differs. It was found that viscosity of neopentylglycol diglycidylether-hexahydrophthalic anhydride (NP-HA) was highest. Hardness and tensile strength of photocrosslinked neopentylglycol diglycidylether-hexahydrophthalic anhydride were better than those of other photocrosslinted epoxy acrylates. And 5% weight loss temperature of photocrosslinked neopentylglycol diglycidylether-hexahydrophthalic anhydride was higher than those of other photocrosslinked epoxy acrylates. Value of yellow index of photocrosslinked neopentylglycol diglycidyl ether-succinic anhydride (NP-SA) was lower than the other products.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.3
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• pp.241-250
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• 2011

The new gerotor developed in this paper has an inner rotor in which a circular arc is inserted between the hypocycloid and epicycloid curves, whereas the outer rotor is designed using the simulation results for the rotor and a modification method. The new gerotor has no cusps and loops and no limit on the eccentricity. We increase the average flow rate by adding a new design parameter, $\gamma$, which is the inclined angle of the inner rotor at the intersection of the hypocycloid and the circular arc. A calculation method to calculate the chamber area is also developed. This method can also be used to calculate the flow rate and flow rate irregularity when the contact points are unknown. The control of eccentricity and $\gamma$ is expected to lead to an efficient rotor.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2158-2160
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• 2003

본 논문에서는 동일동기화(Identical Synchronization)과 일반동기화(General Synchronization)를 이용한 하이퍼카오스 시스템을 구성하고 검증하였다. 단일 카오스 모듈을 이용한 통신은 많은 보안의 취약점을 가진 것으로 알려져 있다. 이에 이런 취약점을 보안하기 위해 여러 방법들이 도입되었다. 본 논문은 두 개의 2-double scroll Chua 회로와 두 개의 2-double scroll Chua 오실레이터를 이용하여 하이퍼카오스 회로의 송수 신단을 구성하고 동기화를 이룬 후 송신단에서 정보신호를 실어 채널을 통해 보내어 수신단에서 이를 복조하는 방법을 제안하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.11a
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• pp.445-446
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.10a
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• pp.95-96
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• 2009