• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.76-80
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• 2000

This paper describes a coordinate measuring technique based on optical triangulation using the two images. To overcome the defect of structured light system which measures coordinate point by point, light source is replaced by CCD camera. Pixels in CCD camera were considered as virtual light source. The overall geometry including two camera images is modeled. Using this geometry, the formula for calculating 3D coordinate of specified point is derived. In a word, the ray from a virtual light source was reflected on measuring point and the corresponding image point was made on the other image. Through the simulation result, validation of formula is verified. This method enables to acquire multiple points detection by photographing.

• Journal of Advanced Marine Engineering and Technology
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• v.11 no.4
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• pp.41-49
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• 1987

Recently microcomputers have come into wide use in the field of control. They are used not only as monitors and or controllers in various plant control systems but also for Computer Aided Design of control systems. In this paper, authors propose a method to design the reduced order observers for the higher order systems and have digital simulation of time responses of the optimal state feedback control system using the maximum principle. And the real time optimal state feedback control system for the third order plant which is realized by an anolog computer is constructed by means of a microcomputer, A/D converter and D/A converter. Time responses of the real time control system are compared with those obtained by the digital simulation and their well coincedence is confirmed.

• Journal of Power System Engineering
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• v.20 no.3
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• pp.36-42
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• 2016

A cylinder control system of the conventional construction machine has been controlled by hydraulic spool valves. This system is low-cost but system efficiency is not high. Recently, to improve this, all valves are controlled electronically and independently. Bu and Yao suggested four way electronic hydraulic control valve system. It is called IMVT(Independent Metering Valve Technology). The purpose of the study is to find proper IMV pressure control method for excavator and to validate excavator's bucket regeneration energy effect by controlling the IMV system. In this paper, we mathematically describe the bucket system of excavator first. And then, based on these results, we design the control system which is divided into two operations(none regeneration or regeneration).The results of the experiment show the desirable performance and usefulness of the designed control system.

• Journal of KSNVE
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• v.8 no.1
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• pp.195-203
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• 1998

The magnetic levitation system is utilized in the magnetic bearing of high-speed rotor because of little friction, no lubrication, no noise and so on. The magnetic levitation system need the feedback controller for the stabilization of system, and gap sensors are generally used to measure the gap. The use of sensor easily goes into troublesome caused by sensor failure discord between the measurement point and the control point etc. This paper presents the design of robust stabilizing contoller by $H_{\infty}$ control theory using the sensorless method proposed by authors in the magnetic levitation system. And we investigated both the validity of the designed controller and the usefulness of the sensorless magnetic levitation system through results of actual experiment.

• Journal of Institute of Control, Robotics and Systems
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• v.3 no.1
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• pp.1-8
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• 1997

In order to reject the steady-state tracking error, it is common to introduce integral compensators in servosystems for constant reference signals. However, if the mathematical model of the plant is exact and no disturbance input exists, the integral compensation is not necessary. From this point of view, a two-degree-of-freedom(2DOF) servosystem has been proposed, in which the integral compensation is effective only when there is a modeling error or a disturbance input. The present paper considers robust stability of this 2DOF servosystem incorporating an observer to the structured and unstructured uncertainties of the controlled plant. A robust stability condition is obtained using Riccati inequality, which is written in a linear matrix inequality (LMI) and independent of the gain of the integral compensator. This result impies that if the plant uncertainty is in the allowable set defined by the LMI condition, a high-gain integral compensation can be carried preserving robust stability to accelerate the tracking response.

• The Magazine for Energy Service Companies
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• s.39
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• pp.70-73
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• 2006

클린 에너시 시장 "2015년 1672억 달러로 성장"/대림산업 양주 택지지구에 구역형 집단에너지 사업/산자부 에너지진단의무화 입법예고/동아전람 '제2회 동아 빌딩박람회'참가업제 모집/에너지기술연 제지설비 응축열 재활용 '열교환기'상용화/산자부 환경친화 산업구조개선 법률 개정/미국 냉동공조공학회 이진원 교수·이상민 박사에 최고논문상/광주시 그린빌리지, 수소연료전지 본격가동/대전 신동아파트 소형열병합 ESCO자금 상황 '끝'/기획예산처 교육세 일부 환경,에너 지 분야에 활용/유기태양전지 개방 '청신호'/중소기업청 신기술 제품 공공구매 본격 확대/에노지관리공담 혁신도시 건설을 위한 신·재생에너지보급 촉진 간담 회 개최/산자부 온실가스 배출통계 시스템 구축

• KOREAN POULTRY JOURNAL
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• v.36 no.7 s.417
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• pp.109-111
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• 2004

산란계 및 육계, 오리 산업의 발달로 고밀도 사육 추세로 전에 없던 많은 질병이 발생하고 있어 행정당국 및 양축 농밀들은 많은 예산을 투입하여 질병 예방에 전력하고 있음에도 2003년 12월 국내에서는 처음으로 고병원성 가금인플루엔자가 발생하였다. 고병원성 가금인플루엔자 발생으로 오리 10농가, 닭 9농가로 총 19농가의 오리$\cdot$닭 560만 여수가 살처분되어 보상비만 1,500억원이 직접 소요되었다. 처음 오리 농장에서 발병, 인근농가로 살처분이 확대되어 위생적으로 관리하는 농가도 선의의 피해를 입게되면서 안타까움을 더 해줬다. 당국의 철저한 차단 방역으로 재발병 및 전파에 전력하였으나 2004년 3월 20일 양주시 은현면에서 남은 음식물을 사료화하고 일반 산란농가에서 노계로 도태되는 수명이 다한(정상사료 급여로는 경제성이 없는 노계) 닭을 저렴한 가격으로 구입, 서울 등지에서 수거한 남은 음식물을 적당히 가열, 살균 조치가 의심스러운 남은 음식물을 처리수수료까지 받으며 급여하던 농가에서 발병, 인근 3km 이내의 10여 농가 40여만수를 살처분하여 막대한 재산상의 손실을 초래하였다.

• Journal of Power System Engineering
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• v.5 no.4
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• pp.44-52
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• 2001

This paper considers a modeling and identification for the MIMO magnetic bearing system. To obtain the nominal plant transfer functions, we have experimented on the frequency response by a closed-loop identification method because the system is unstable essentially. We suggest a method of curve-fitting for obtaining the transfer function from the frequency responses by using the system's modeling structure and two controllers which are different from each other. From the frequency response results, we found the effects of coupling by opposing controllers. And using this effects and the system's modeling structure, we could obtain the transfer functions of which have the same modularized denominators.

• Journal of Power System Engineering
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• v.5 no.4
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• pp.53-60
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• 2001

This paper considers a modeling for the MIMO magnetic bearing system. The rotor is flexible and has a complex shape. To obtain the nominal plant transfer functions, we perform a numerical analysis by using the finite element method(F.E.M.) for the rotor's dynamics, and make a nominal model by reducing the modes from the results. And, we have experimented on the frequency response by a closed-loop identification method, and compared it with the simulation's result on the closed-loop control system.

• Journal of Power System Engineering
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• v.20 no.6
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• pp.11-19
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• 2016

A variable speed refrigeration system(VSRS) has been received high attention for energy saving ability. This paper investigates effects of design factors such as membership function range and sampling time to control performances for systematical designing fuzzy logic controller of the VSRS. Some comparisons of control performance between the fuzzy and PI are conducted including comparative evaluation of robustness against noise by using computer simulations. The simulation results showed that the fuzzy is very useful design method for engineers in the industrial fields which have big noises system and deal with inherent nonlinear system like the VSRS.