• 한국학교수학회논문집
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• 제4권1호
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• pp.69-80
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• 2001

A web-based intelligent education system(WEST) was designed and implemented to improve the self-directed study for students by providing them the study according to one's ability. WEST is composed of a tutor agent, an administrator module, a teacher module and a student module. The tutor agent analyzes students' ability and selects questions from a database according to their ability. The administrator module administrates subjects and students. The teacher module makes questions with three levels and administrates questions. The students module gives the questions students and the result of study. WEST was used in a mathematics subject for high-school students. Especially our system was better than the others in study according to students' ability.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.52.4-52
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• 2001

In this paper we propose a framework of an open architectured manufacturing system base on CORBA middleware. The manufacturing system consists of four configurable software modules 9mchine control module, database module, monitoring module, and operation module). Each module is distributed through the network and integrated with CORBA middleware technology. CORBA Characteristics including independence from programming languages, computing platforms and networking protocols makes us to easily develop new applications and to effectively integrate new module into existing distributed systems. The CORBA program used in this study is The ACE ORB (TAO) developed by the laboratory in Washington University.

• 반도체디스플레이기술학회지
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• 제20권3호
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• pp.161-166
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• 2021

To prevent accidents caused by changes in the surrounding environment or other factors, various protection facilities are installed at the photovoltaic connection module. The main causes of fire are sparks due to foreign substances inside the photovoltaic connection module through high temperature rise and dew condensation in the photovoltaic connection module, and fire due to heat from the power diode. The proposed method can predict the fire by measuring flame, carbon dioxide, carbon monoxide, temperature, humidity, input voltage, and current on the photovoltaic connection module, and when the fire conditions are reached, fire alarm and power off can be sent to managers and users in real time to prevent fire in advance.

• 경영과학
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• 제9권1호
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• pp.41-52
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• 1992

The QOS(Quality of Service) recognized by the customer will become the most important thing under the competitive telecommunications market. Korea Telecom is going to develop many system to manage the telecommunication network, to improve the level of QOS, and to increase the revenue. Operation and Maintenance Adiministration System is one of the systems developed to meet those purposes efficiently. This system gathers qualities data from telephone offices or operation centers and analyze the results of QOS improvement activities and evaluate overall QOS. And also system makes it possible to improve the cost/effectiveness of operation and maintenance of telecommunication network. Operation and Maintenance Administration System has four functional modules, i.e., the user interface module, the database management module, the QOS management module, and the database conversion module. The purpose of this study is to develop the QOS management program, one of the four functional modules of the system,using FOCUS 4GL/DBMS. Since Operation and Maintenance Administration System is developed using FOCUS 4GL, every user can handle and maintain the system very easily and reduce system backlogs.

• 한국지반환경공학회 논문집
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• 제14권11호
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• pp.47-54
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• 2013

본 연구는 모듈러 도로시스템에 적용 가능한 맞춤형 지지구조 모듈러 개발을 위한 기초연구로서 연약지반 조건에 대한 지지구조 모듈의 설계사례 연구를 수행하였다. 지지구조 모듈은 크로스빔 지지구조와 크로스빔-말뚝 지지구조 두 가지 형식으로 제안하였다. 두 형식에 대한 설계검토를 통하여 연약지반에 대해서는 크로스빔-말뚝 지지구조가 적합한 것을 확인하였으며, 모듈러 도로시스템에 적합한 크로스빔-말뚝 지지구조의 제원을 도출하였다. 맞춤형 지지구조 모듈러 개발을 위해서는 향후 다양한 국내 도로건설 현장의 원지반이나 노체에 대한 DB를 구축하고 설계사례 연구를 통하여 지반조건에 따른 지지구조 모듈의 분류 및 체계화가 필요할 것으로 판단된다.

• 한국정보통신학회논문지
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• 제23권5호
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• pp.487-494
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• 2019

소형인공위성 전력시스템체계 설계 및 개발방법은 태양풍 자계인 우주환경의 영향에 따라 기술적 제약이 큰 편이다. 이를 극복하기 위해 최근 전력모듈을 융합화와 유닛화 단계별 개발 방식으로 변화 하고 있다. 모듈화 단계에서는 탑재체 전력공급 모듈 요구조건과 함께 유니버설미들웨어를 사용하여 융합하였다. 융합모듈화대상은 탑재체에서 전력분배, 부하관리, 서브유닛의 전원공급체계와 지속성을 고려한 최종모듈 설계 및 개발 단계를 범위로 한다. 본 연구는 위성본체에서 공급되는 전력모듈을 유니버설미들웨어 기반으로 전력모듈의 정밀성과 수요처모듈데이터를 컨텐츠화 하였다. 이 동적시스템과 전력서비스 모듈화는 전력분배모듈과 전원공급모듈간 상호작용으로 Range Control 알고리즘으로 제어된다. 그리하여 전력모듈 설계단계에서 탑재체 전력수요 변수의 변동성에 따른 불확실성을 해소하고 설계의 효율성을 제시하였다.

• 한국멀티미디어학회논문지
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• 제11권11호
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• pp.1547-1554
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• 2008

본 논문은 센서 네트워크를 이용하여 실시간으로 건물 내부의 화재 정보를 감시하고, 화재 발생 시 적절한 대피 경로를 제안하는 화재 대피 유도 시스템 모델을 제안한다. 이 시스템 모델은 센서 경보 모듈(sensor alert module), 행위 제안 모듈(behavior suggestion module), 비상 장치 제어 모듈(emergency device control module) 등으로 구성된다. 센서 경보 모듈은 센서 네트워크에서 수집한 정보를 주기적으로 감시하고, 규칙기반 알고리즘을 이용하여 화재 여부를 판별한다. 그리고 행위 제안 모듈은 센서 경보 모듈이 생성한 위험 센서 목록(danger sensor list)을 가지고 화재지역을 파악하여 화재 위치에 따른 비상등의 방향을 제시하고, 비상 장치 제어 모듈은 제시된 비상등의 방향에 따라 관련 비상 장치를 제어하거나 화재 상태를 도시한다. 이 시스템의 동작을 검증하기 위해 가상으로 무선 센서 네트워크의 데이터를 생성하여 인터넷 웹 기반의 화재 대피 유도 시스템을 구현하여 실험한다. 향후 본 연구를 통하여 대형 건축물에서 화재 발생과 같은 긴급 상황 발생할 경우 사람들을 안전하게 보호할 수 있을 것으로 사료된다.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1998년도 추계 학술발표회 논문집
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• pp.3-8
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• 1998

The present work proposes the potential fuzzy framework, based on fuzzy set theory, for supporting decision-making problems, especially, selection problems of a best design in the area of nuclear energy system. The framework proposed is composed of the hierarchical structure module, the assignment module, the fuzzification module, and the defuzzification module. In the structure module, the relationship among decision objectives, decision criteria, decision sub-criteria, and decision alternatives is hierarchically structured. In the assignment module, linguistic or rank scoring approach can be used to assign subjective and/or vague values to the decision analyst's judgment on decision variables. In the fuzzification module, fuzzy numbers are assigned to these values of decision variables. Using fuzzy arithmetic operations, for each alternative, fuzzy preference index as a fuzzy synthesis measure is obtained. In the defuzzification module, using one of methods ranking fuzzy numbers, these indices are defuzzified to overall utility values as a cardinality measure determining final scores. According these values, alternatives of interest are ranked and an optimal alternative is chosen. To illustrate the applicability of the framework proposed to selection problem, as a case example, the best option choice of four design options under five decision criteria for primary containment wall thickening around large penetrations in an advanced nuclear energy system is studied.

• 한국정밀공학회지
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• 제20권1호
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• pp.107-117
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• 2003

Polishing a die that has free-form surfaces is a time-consuming and tedious job, and requires a considerable amount of high-precision skill. In order to reduce the polishing time and cope with the shortage of skilled workers, an automatic polishing robot system was developed. The polishing robot system is composed of two subsystems, a three-axis machining center and a two-axis polishing head. The machining center is controlled by a FANUC controller, and the polishing head by DSP controller. The system has five degrees of freedom and is able to keep the polishing tool normal to the die surface during operation. To easily operate the developed polishing robot system, this study developed an integrated operating program in the Windows environment. The program consists of five modules: a polishing data generation module, a code separation module, a polishing module, a graphic simulator module, and a teaching module. And, the automatic teaching system was developed to easily obtain teaching data and it consists of a three dimensional joystick and a proximity sensor. Also, to evaluate the performance of the integrated operating program and the polishing robot system, polishing experiments of a die of shadow mask were carried out.

• 한국태양에너지학회 논문집
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• 제32권2호
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• pp.1-10
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• 2012

A photovoltaic/thermal (PVT)solar system is the solar technology that allows for simultaneous conversion of solar energy into both electricity and heat. This paper compared the performance of PVT system with a conventional PV module and solar collector and analyzed electrical and thermal efficiency of PVT system in terms of solar irradiance and inlet temperature of the working fluid. Based on the experimental data, thermal and electrical efficiencies of he glazed PVT system were57.9% and14.27% under zero reduced temperature condition which were lower by 13.6% than the solar thermal absorber plate and by 0.08% than the PV module respectively. For the unglazed PVT system it had lower thermal efficiency than the solar thermal absorber plate but higher electrical performance than the PV module due to the cooling effect by the working fluid. However, total efficiency of the glazed PVT system was72.2% which was higher than combined efficiencies of the solar collector and PV module. Besides, total efficiency of the PVT system would be much higher if calculated based on unit area.