• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 추계 학술논문 발표대회
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• pp.95-96
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• 2012

This study makes with the environment-friendly artificial stone which doesn't use the cement and natural aggregate and increases the blast furnace slag that is the eco-friendly material that is the industrial byproduct, fly ash, and availability of the red mud and applies the coares aggregate substitute material as the cleistothecium. The experimental plan according to it indicated the compressive strength and flexural strength which is the most excellent in the mixied ratio 40% of the result degree of closeness magnetism of experimenting with the optimal mix obtained through the preceding stude.

• Journal of Advanced Marine Engineering and Technology
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• 제24권1호
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• pp.119-126
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• 2000

In constructing the positioning system based on a conventional dead-reckoning for a wheeled vehicle with pneumatic tires, the position estimation error is inevitable as changes of the radius of the wheels depend on live load and variable enviroment. Therefore, this paper proposes the positioning system which can estimate the error source i.e. the vehicle parameter errors, such as the right and left wheel radius error, using gyroscope and ultrasonic sensor and correct the parameter to reduce the dead-reckoned position estimation error. The extended Kalman filter was used as a method for the multisensor data fusion. The simulation to verify the effectiveness of the proposed positioning system is performed.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2007년도 동계학술대회
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• pp.169-172
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• 2007

최근 DMB 서비스와 같이 저 전력 무선 환경에서 유료 콘텐츠 서비스가 활발히 이루어지고 있다. 이러한 콘텐츠 서비스를 정당한 서비스 수신자에게 제공하기 위해서는 서비스 제공자와 수신자 사이에 안전한 키 교환이 필요하다. 본 논문에서는 모바일 콘텐츠 서비스를 위한 효율적 인 ID-기반의 그룹 키 교환, 즉 다수의 서비스 수신자들(클라이언트)과 서비스 제공자(서버) 사이의 인증된 동적 그룹 키 교환 프로토콜을 제안한다 제안한 프로토콜은 클라이언트의 계산량이 낮아 저 전력 모바일 환경에 적합하며, 또한 가입과 탈퇴 발생 시에도 효율적으로 키 교환을 수행할 수 있다. 제안한 그룹 키 교환 프로토콜은 랜덤 오라클 모델에서 그 안전성을 제공한다.

• 한국산업정보학회논문지
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• 제4권4호
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• pp.137-142
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• 1999

본 논문은 리눅스 서버 환경에서 여러 분야의 업무를 운영하려고 할 때에 발생되는 보안 문제를 해결하기 위해서 역할기반 접근제어(Role-Based Access Control : RBAC) 기법을 이용하여, 리눅스 환경에서 운영 가능한 RBAC＿Linux 보안 시스템을 설계하였다. 본 논문에서 RBAC_Linux는 RBAC 기법을 리눅스 환경에 적용하여 설계되었으며, 적용한 RBAC 모델로는 Sandhu 등이 제안한 RBAC96모델을 이용한다. 따라서 리눅스 서버 시스템에 설계 제안된 RBAC_Linux 보안 시스템을 이용하면 서버의 소스코드를 수정없이 구현 가능하여, 이식성이 높으며, 보안 관리가 단순하고 용이하다는 장점을 갖는다.

• 한국정밀공학회지
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• 제17권10호
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• pp.89-94
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• 2000

Engineering database for CIM of injection mold production has been developed to manage design information and parameters of injection mold. The database has direct connection with product data management system and management database. Design specifications are generated in initial stage of mold design with integration of management information. Design parameters and bill of materials for mold base parts are generated during the CAD process and transferred to the manufacturing database and procurement system. Standard modules for parts and mold base are constructed using national standard and legacy data of industries. The engineering database provides important information route for CIM of injection mold design and production.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2004년도 춘계학술발표대회 논문집
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• pp.150-155
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• 2004

The purpose of this study was to get a possibility of maintenance architecture, which present instead of contemporary architecture through interrelation between Organic architecture and Gaia theory. Through this study to fine a interrelation part between Organic architecture and Gaia Theory as general case, and through the Gaia theory, Organic architecture being progress as new design experiment exposition. After modern time, we can have presentation of main subject which corresponds to mechanical rationalism and rising Organic architecture from Organic Holism. Organic architecture is get close to biological or ecological access to nature and environment so from and inner order could apply to architecture after that better circumstances and maintenance(sustain architecture) development could possible, although the point became more importance. In this point, Jim E. Lovelock's Gagia theory which try to proscript relationship(element of enviroment) of earth, this is pretty big deal and we can find a connection with Organic architecture in the theory.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.516-516
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• 1993

This study was carried out to develop an environment -controlled vegetable growth system. The control objects considered were light, temperature, humidity, $CO_2$ concentration and the conditions of nutrient solution such as pH , EC and dissolved oxygen. A monitoring system was developed to measure the above environmental factors, fresh weight and $CO_2$consumption rate. The overall performance of the developed system was reasonably acceptable for vegetable growth. by the lettuce growing test, it was shown that the developed system had a good repeatability , and the growth responses could be measured satisfactorily.

• 한국생활과학회지
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• 제6권2호
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• pp.1-14
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• 1997

The purpose of this study was to find out middle age women's needs of the educare services. Furthermore this study was done to serve as the basic data for guidance and the preparation of effective educare services. For these purposes, the data were collected by using questionnare from to 305 middle age women living in T city. The data were analyzed by frequency, percentile, chi square analysis. The major findings of this research are as follows: 1. Most subjects of present study needs for the daycare center. Furthermore there were significant differences in the daycare management, caring agent, day care cost according to the school career. 2. They wantd nere home daycare center and part time daycare center. And there were no significant differences in general enviroment of daycare center according to the school career. 3. There were significant differences in 1)the standards of selection for teacher 2)teacher's educational level, 3)teacher's age according to the school level. And they wanted 'low school career but caring experiences' daycare teacher.

• 한국통신학회논문지
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• 제18권8호
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• pp.1083-1093
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• 1993

Recently, some applications require the multicast service that transmit messages to multiple destinations in computer communication network enviroment. Multicast service is to send messages to the group which consists of a number of processes. A multicast group is a collection of processes which are destinations of the transmitted messages and these processes may run on one or more hosts. Therefore, it is important to manage each member of process groups in order to provide efficient multicast services. In this paper, we design and implement group management system to support multicast services. Group Management System was designed with Process Group Management System(PGMS) and Host Group Management System(HGMS). We have implemented basic primitives of PGMS, HGMS. Also, membership tree management algorithm is designed and implemented. Membership tree provides the relation of the members of multicast groups and routing Informations.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.3052-3054
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• 2005

Ubiquitous Computing 환경은 모든 사물과 공간이 지능화되어 사용자가 컴퓨터나 네트워크를 의식하지 않는 상태에서 장소에 구애받지 않고 자유롭게 네트워크에 접속할 수 있는 환경을 의미한다. 만일 이러한 환경 속에서 개인정보들이 노출되었을 경우는 법적, 사회적, 경제적으로 커다란 손실을 초래하게 된다. 이것을 방지하기 위해서는 안정성과 효율성이 높은 암호 알고리즘이 요구된다. 본 논문에서는 한국 표준으로 제정된 ISPN(Involutional SPN) 구조의 블록 암호화 ARIA 알고리즘을 사용하여 고속의 통신망과 Smart Card, PDA, 이동전화 및 다양한 기기 둥의 사용이 보편화될 Ubiquitous Computing 환경에 응용 가능한 ARIA 암호화 프로세서(이하 ARIA 프로세서)를 설계하였다.