• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 춘계학술대회 논문요약집
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• pp.34-34
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• 2004

정보의 급속한 발전, 컴퓨터, 가전기기, 자동차등 내구 소비재의 제품 개발기간 단축, 생산자의 지속적인 생산성 향상 활동, 소비자 선호의 다양성, 품질 요구 수준 상승 등 제반 환경변화는 절삭가공부분에 있어 핵심이 되고 있다. 여기에 전통적 제조업의 고부가가치화 및 새로운 시스템의 도입 등과 맞물려 최근의 초정밀 공작기계는 고속화, 고정밀화를 바탕으로 크게 발전하고 있다, 특히 21세기로 향하는 지금 공작기계 기술은 고속화, 정밀화, 개방화, 환경친화의 방향으로 혁신을 지속하고 있으며, 머지 않아 마이크로 프로세서의 급속한 발전에 힘입어 고속화 기술은 극 초고속화 단계로, 정밀화 기술은 극 초정밀화 단계로, CNC 기술은 오픈화 및 네트워크화를 통한 다양한 통신기술이 부가됨으로써 설계, 생산, 영업 및 서비스 정보와 연계시켜 통합제어를 통한 타 지역의 공작기계를 원격제어 할 수 있는 단계로 이르게 될 것이다.(중략)

• Journal of Biosystems Engineering
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• 제18권4호
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• pp.317-327
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• 1993

This study was carried out to develop a microcomputer-based data acquisition system and software for analysis of engine vibration. Due to this development of system and software, studies on the vibration of engine was able to conduct efficiently. From the display of color monitor, the outputs of test were compared and analysed on zero-base monitoring. The results obtained are summarized as follows : 1. Data acquisition system in microcomputer was designed and programmed and operated accurately. 2. The results of test were easily compared in monitoring of zero-base at color monitor. 3. The system and program developed was able to control the measuring intervals, number of channels, and number of data.

• Journal of Biosystems Engineering
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• 제19권2호
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• pp.99-111
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• 1994

Automatic control system using microcomputer that have been studied in greenhouse, however, it was very difficult operation with success due to handicap for a various conditions and cultivated plants. This study was performed in order to develop of the basic program and hardware system for automatic control in greenhouse, such as automatic supplying of water, liquefied fertilizer solution and chemical solution. The results were summarized as follows. 1. The program for soil moisture control used by the switch type tensiometer was well operated. 2. The proximity switch was applied as well to water level control but it was very expensive, so low-priced sensor has to be developed. 3. The water meter was not excellent for mixing control of liquefied fertilizer, chemical and water, so water meter for only agricalture has to be developed. 4. Interface system for this study was suited to the developed controller. 5. Automatic control system to supply for water, liquefied fertilizer and chemical solution that was well operated as a fundamental study for product of controller.

• 한국수학교육학회지시리즈A:수학교육
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• 제45권2호
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• pp.165-176
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• 2006

In this paper, we consider changes of algebra strands around the world. And we suggest needs of designing new computer environment where we make and manipulate geometric recursive patterns. For this purpose, we first consider relations among symbols, meanings and patterns. And we also consider Logo environment and characterize algebraic features. Then we introduce L-system which is considered as action letters and subgroup of turtle group. There are needs to be improved since there exists some ambiguity between sign and action. Based on needs of improving the previous L-system, we suggest new commands in JavaMAL microworld. So we design a microworld for recursive patterns and consider meanings of letters in new environments. Finally, we consider the method to integrate L-system and other existing microworlds, such as Logo and DGS. Specially, combining Logo and DGS, we consider the movement of such tiles and folding nets by L-system commands. And we discuss possible benefits in this environment.

• 한국식품저장유통학회지
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• 제1권2호
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• pp.99-105
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• 1994

To convert the analog signal from the drying process into the digital signal, the interface circuit was designed and built. To measure the weight and temperature during drying process, strain gauge type load cell and temperature transducer composed of pt 100 $\Omega$ thermometers and wheatstone bridge circuits were built and used. The temperature control device was composed of photocoupler and triac. Microcomputer aided experimental convective drying system was built with above cricuits and devices. Drying characteristics of onions can be estimated using this system.

• 한국식품영양과학회지
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• 제18권1호
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• pp.29-33
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• 1989

본 연구는 마이크로컴퓨터를 활용하여 식품건조 공정중 온도, 무게 변화에 대한 자료수집과 온도를 자동제어 하기위해 접속장치, 온도와 무게 계측장치, 온도제어시스템을 설계제작하였다. 또한 이들 시스템을 운영하기 위해 basic언어 Assembly언어로 프로그램을 작성하여 수행한 결과 건조중 식품무게변화와 온도변화값을 성공적으로 계측할 수 있었고 건조온도를 설정된 목표값에 따라 자동제어가 가능했다.

• 대한전자공학회논문지
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• 제16권4호
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• pp.27-31
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• 1979

두개의 광전 transducer array를 나란히 1/2 화소만큼 어긋나게 배치하여서 거기에서 얻어진 신호들로 부터 해상도가 2배높은 transducer의 성능을 얻는 방식이 제안, 그리고 실험되었다. 높은 해상도의 입장에서 보아 2개의 화소의 평균치들로 신호를 내어주는 이 transducer 둘로부터 고신호의 추정은 마이크로컴퓨터 -로 행하였다.

• 대한전자공학회논문지
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• 제20권6호
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• pp.43-51
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• 1983

CCITT의 X.25 규정에 의거한 소형파켓트 교환 시스템이 연구 설계되었다. 각 교환단국은 한 개의 마이크로컴퓨터에 의해서 가입자 접속제어로부터 교환회선 설정 및 링크제어의 기능을 수행하도록 되어있다. 각 계층에 대한 기본적인 제어절차가 설계 구성되었으며, 그 실험결과가 검토되었다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회B
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• pp.2043-2052
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• 2008

The increasing heat generation rates in CPU of notebook computers motivate a research on cooling technologies with low thermal resistance. This paper develops a closed-loop two-phase cooling system using a micropump to circulate a dielectric liquid(PF5060). The cooling system consists of an evaporator containing a boiling enhancement microstructure connected to a condenser with mini fans providing external forced convection. The cooling system is characterized by a parametric study which determines the effects of volume fill ratio of coolant, existence of a boiling enhancement microstructure and pump flow rates on thermal performance of the closed loop. Experimental data shows the optimal parametric values which can dissipate 33.9W with a film heater maintained at $95^{\circ}C$.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2002년도 춘계 기술심포지움 논문집
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• pp.203-207
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• 2002

CSP(Chip Size Packaging) SAW Filter Package에 대해서, 유한요소해석(Finite Element Analysis) 컴퓨터 Simulation 프로그램인 ANSYS를 이용하여 Package의 온도 분포를 해석하였다. 신뢰성(reliability) Test 조건에서 Transient Thermal Simulation을 한 후, 조건을 변화시켜 가면서 Chip 내부 온도가 어떻게 변화하는지 알아보았다. Chip에 1.8 hour 동안 4W의 열원을 주고, 주위는 2$0^{\circ}C$ 자연대류로 놓고 Transient Thermal Simulation한 결과는 약 99$^{\circ}C$로, 허용 가능한 온도인 11$0^{\circ}C$보다 약 11$^{\circ}C$ 낮음을 알 수 있었다. 또한 이는 실험값인 약 95$^{\circ}C$와 유사한 값을 나타내었다.