• Proceedings of the Korean Information Science Society Conference
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• 2000.04b
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• pp.48-50
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• 2000

대용량의 공간 및 비공간 데이터의 관리와 다수 사용자에 의한 데이터 공유를 지원하기 위해서는 클라이너트-서버 구조의 공간 데이터베이스 시스템을 사용하는 것이 효과적이다. 본 논문에서는 클라이언트-서버 구조의 공간 데이터베이스 시스템인 GEO/Millennium 시스템을 소개한다. GEO/Millennium은 클라이언트 캐슁을 수용한 질의 전송 방식을 사용하며, 공간 및 비공간 데이터를 통합하여 저장, 관리하는 통합구조의 시스템이다. 제안하는 시스템은 데이터베이스의 변경사항을 멀티캐스팅으로 클라이언트들에게 통지하여 데이터의 일관성을 유지하며, 클라이언트의 각 모듈을 컴포넌트로 구성하여 어플리케이션 개발의 용이성과 재사용성을 높인다. GEO/Millennium은 객체의 저장과 연산을 저장관리자와 질의 처리기에서 지원해 줌으로써 공간연산을 효율적으로 수행할 수 있으며, 클라이언트-서버간의 통신부하를 줄여 클라이언트의 질의에 대해 보다 빠른 응답시간을 갖는다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.424-426
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• 2000

소프트웨어를 개발하는 방법으로 기존의 구조적 방법론에서 객체지향 방법론으로 발전하였고 최근 들어 소프트웨어 재사용의 핵심 기술로 인식되고 있는 것이 컴포넌트 소프트웨어기반 개발 방법론이다. 본 논문에서는 컴포넌트 소프트웨어, 컴포넌트 기반개발의 이점, 컴포넌트의 요건과 자바 컴포넌트(자바 클래스 또는 자바 컴포넌트)들 간의 기능, 속성, 연결 등을 동적으로 상호 작용(Interaction)할 수 있는 환경(Environment)을 제안하려 한다. 이오 같은 환경은 이미 만들어진 자바컴포넌트의 컴포넌트를 재사용 및 조립 전에 아키텍쳐의 모델링 도구로서 행위분석(Behavioral analysis)과 인터페이스의 기반설계(Interface Based Design)의 기반을 제공하고 자바 컴포넌트의 인터페이스와 기능을 이해하고 결합형태를 미리 짐작할 수 있는 환경을 제공함으로써 소프트웨어 개발에 소요되는 개발비용을 최소화하고 사용자의 요구를 충족시킬 수 있는 장점을 지니고 있다.

• Science of Emotion and Sensibility
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• v.1 no.1
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• pp.13-17
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• 1998

현대의 인간 생활을 변화시키는 요인중에서 과학기술을 기반으로 한 산업과 사회의 비중은 높다. 특히 개인의 생활과 밀접한 관계가 있는 전지 전자 및 컴퓨터 산업은 짧은 기간에 인간의 생활과 의식구조를 변화시켰으며, 산업사회에서 정보사회로의 발전을 가속화 시키고 있다. 인간이 산업화를 통하여 물질적인 풍요와 신체적인 편리성을 얻었다면 정보화를 통해서는 정신적인 풍요와 만족감을 추구하고 있다. 이러한 정신적 풍요와 만족감은 인간 생활속의 제품과 환경에 대한 감성 만족을 통하여 얻어질 수 있다. 인간의 감성을 만족시킬 수 있는 제품과 환경의 개발은 개인의 감성에 대한 정확하고 정밀한 이해가 요구된다. 소비자의 욕구 또는 감성은 계속하여 변화하며, 세계는 정보통신기술에 의하여 좁아지고 있다. 우리가 ‘국가는 존재하되 국경은 없다’는 세계화된 정보사회에서 생존하기 위해서는 세계인 개인의 생활문화가 반영된 ‘High Clusture’제품을 개발하여야 하며, 그 과정이 감성과학이며 감성공학이다.

• Carbon letters
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• v.11 no.1
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• pp.34-37
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• 2010

In this work, graphite nanofibers (GNFs) were prepared by ammonia and heat treatment at temperatures up to $1000^{\circ}C$ to improve its $CO_2$ adsorption capacity. The effects of the heat treatment on the textural properties and surface chemistry of the GNFs were investigated by $N_2$ adsorption isotherms, XRD, and elemental analysis. We found that the chemical properties of GNFs were significantly changed after the ammonia treatment. Mainly amine groups were formed on the GNF surfaces such as lactam groups, pyrrole and pyridines. The GNFs treated at $500^{\circ}C$ showed highest $CO_2$ adsorption capacity of 26.9 mg/g at 273 K in this system.

• Proceedings of the ESK Conference
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• 1997.10a
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• pp.160-167
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• 1997

The statistics of work related Low Back Pains(LBPs) in Korea and outside the countires have erviewed. Despite improved working enviroment with increased automation in industry, the LBPs hve been gradually increased and the workers compensation of such injuries has increased drama- tically. An epidemiological study indicated tha tthe LBPs is te major cause of injury, lost time and medical costs in many industrial workplace especially, a high occurrence rate of LBPs among construction and manufacturing workers. The objective of this study is to investigate problems involved with LBPs in Korea and outside the country for identifying its possible causal factors and characteristics. This study will thus contribute as a basic reference to the industries and ergonomic practitioners for preventing and managing LBPs.

• Korean Journal of Computational Design and Engineering
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• v.15 no.6
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• pp.403-410
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• 2010

This paper is aimed at the development of a theoretical framework that addresses practical applications of generative design system that have been observed in architectural practice. Existing theoretical frameworks are not aimed at addressing this specific use of parametric tools but do provide a set of key themes. Based on these themes a generative design system is presented here as a means for tackling architectural design development tasks. This is then used in order to examine a case study; the generative design system tasks involved in the design development and documentation of the Olympic Stadium in Germany. The findings from this examination are used to discuss proposals and implications for a practical framework for generative design in architecture.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.234-236
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• 2011

Saigon Port within the port system of the Vietnam Maritime sector is one of the port having highest throughput and productivity in the country. The marine traffic of Saigon water ways is the heaviest in Vietnam and the number of marine accidents in this area are much higher than the others area in Vietnam. In order to reduce the risk of the accident in Saigon fairway, this paper concentrates on marine accident frequency in this area. The marine traffic and the marine accident were analyzed to find out the probability of vessel collision and the marine traffic risk. It follows that the main shipping route through Saigon fairway has the high risk of ship-ship collision.

• Proceedings of the KIEE Conference
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• 1998.07g
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• pp.2495-2497
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• 1998

Fiber optic facilities are increasingly being deployed in loop applications for both busines and residential areas. These facilities support a variety of communications services that include high speed data and video using leading technologies such as Synchronous Optical Network (SONET), Wavelength Division Multiplexing(WDM). This proliferation of fiber optic facilities combined with the increasing pressure on network operators to reduce costs are fostering increased automation to reduce labor costs associated with providing and maintaining communications services. Effective fiber management and accurate records can improve the reliability and integrity of the future telecommunications networks and the quality of customer services. This paper describes the trend forward and the need for the deployment of Fiber Administration System (FAS) into the operations enviroment of a typical network provider.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2009.11a
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• pp.107-110
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• 2009

After inquiring into physical characteristics of using fly ash and alkali solution, it was found that higher pH density is favorable to strength development at early age and the higher the age is, the higher the compressive strength gets. Also, it was found that when there is more addition of activator, the compressive strength is higher. I was shown that more than atmospheric curing, steam curing was favorable for development of compressive strength. When the temperature of curing temperature was higher, most of the compressive strengths were higher. Thus, based on this study, it was understood that environmental-friendly chemically combined concrete using fly ash and alkali solution can be utilized without using cement.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.16 no.6
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• pp.489-497
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• 1991

The error rate pquations of digital radio signals transmitted throught the Nakagami's m-distribution fading channel have been both for nondiversity reception and for diversity reception cases in the environmment of Gaussin noise. Using the derived equation. erro rate performance has been evaluated and represented in figures as a function of carrier to noise ratio, fading figure, and the power correlation coefficient between two diversity branches. By comparing the diversity reception case with nondiversity reception case. We could measure the amount of error rate performance improvenment of digital radiosignals in fanding enviroment.