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방사 기저 함수 회로망을 이용한 비선형 혼돈 시스템의 직접 적응 제어기 설계
김근범,박진배,최윤호 연세대학교 산업기술연구소 1997 논문집 Vol.29 No.2
Radial basis function networks(RBFN) are widely used for interpolations and function approximation problems and because of their properties such as fast convergence and superior local approximation ability, conventional multilayered perceptron networks(MLPN) are now being replaced by RBFN. So in this paper, for the control of chaotic systems which are highly nonlinear, a direct adaptive control method using a radial basis function network is proposed. Compared with indirect adaptive methods, direct adaptive methods do not need the off-line identification of the system so that fast and effective control results could be obtained. We simulate on the two representative continuous nonlinear chaotic systems, Duffing and Lorenz systems, and the validity of the designed direct adaptive control system is shown.
IGCC 용 유동층 고온건식탈황공정에서 Zinc-Titanate 탈황제의 100 시간 연속운전 성능실험
이창근,조성호,권학선,김근범,채현규,진경태,손재익 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.2
벤치규모의 고온건식탈황 유동층공정의 연속운전을 탈황제의 장기 반응성, 내마모성, 공정의 신뢰성을 확보하기 위하여 수행하였다. 분무건조법에 의하여 제조된 zinc-titanate 탈황제를 사용하였으며, 반응기 압력은 5기압, 황화반응온도 600℃, 재생반응온도 700℃로 유지하였고, 두 유동층 반응기 사이의 탈황제의 고체순환은 안정적이었다. 환원성 연료 가스중에 7,700 ppm의 H_2S가 황화반응기를 통과한 후 가스중의 황화합물 배출농도를 100시간동안 40ppm미만으로 연속적으로 유지하였다. 두 유동층 반응기에서의 반응과 비산유출 특성을 밝히기 위하여 입자의 밀도, 황성분, SEM, 수은기공분석, BET, 입도분포 등의 분석이 이루어졌다. Continuous operation was performed at high pressure and high temperature to see the long-term reactivity and the attrition resistance of the sorbent, the reliability of the process in a bench-scale KIER fluidized hot gas desulfurization process. A spray dried sorbent consisting of zinc-oxide and titanium oxide was used. The pressure was maintained at 5 atm, the temperatures were 600℃ in a desulfurizer and 700℃ in the the regenerator. Solids were circulated continuously and stably between two fluidized reactors at high pressure. The H_2S concentration at exit was consistently maintained for 100 hours below 40 ppmv for a simulated coal gas containing 7,700 ppm H_2S. The analysis of solid samples, such as densities, sulfur content, SEM, Mercury pore analysis, BET, size distribution, were contributed to uncover the characteristics of reactions and entrainment in two fluidized bed reactors
박진배,박광성,김경근,김근범,장욱 연세대학교 산업기술연구소 1997 논문집 Vol.29 No.1
Due to the relatively limited road capacity, the excess of vehicles cause one of the severest social problems. As a result, some appropriate methods for managing the exploding traffic are needed. In this paper, a fuzzy traffic signal controller is proposed as the most feasible and cost effective alternative. In contrast to the fixed length controller in which all the traffic signals have fixed time length, a fuzzy traffic signal controller has an advantage of varying signal length according to the individual traffic conditions. In addition, the methodology of optimizing the fuzzy traffic signal controller is also proposed using genetic algorithms which emulate the process of biological evolution. Through the simulations, the validity and superiority of the GA-optimized fuzzy traffic signal controller(GA-fuzzy traffic signal controller) is verified over other controllers.