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오염지하수의 생물학적정화 설계에 대한 최적화기법의 특성
윤재흥 (Jae Heung Yoon) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.4
The characteristics of optimization methods are inspected by applying those to groundwater in situ bioremediation. The methods used in the comparison are Evolutionary Algorithms (Binary-Coded Genetic Algorithm (BIGA), Real-Coded Genetic Algorithm (RGA), Derandomized Evolution Strategy (DES)), Direct Search Methods (Nelder-Mead Simplex (NSLX), Modified Simplex (MSLX), Parallel Directive Search (PDS), and Derivative-Based Methods (Implicit Filtering for Constrained Optimization (IFFCO), Successive Approximation Linear Quadratic Regulator (SALQR)). For time-invariant control (9 decision variables), MSLX, IFFCO, DES and SALQR show preciseness in solutions. In case of time-varying control (54 and 72 decision variables), all the directive search methods and IFFCO converge to local optima, and produce inaccurate solutions. SALQR, an optimal control algorithm, shows high efficiency, but also converges to local optima to yield uns table solutions for some cases of time-varying control problems. RGA is more efficient and accurate than BIGA, and more robust than the deterministic search methods. Among the methods, DES is a promising method to be easily applied to other system problems because of its efficiency and accuracy.
김충환(Chung Hwan Kim),윤재흥(Jae Heung Yoon) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.3
N/A Membrane technology including microfiltration(MF) and ultrafiltration(UF) have been recently applied to produce drinking water from river and lake. The conventional water treatment processes such as rapid sandfilter is difficulty in managing the chemical dosage, but membrane technology can be easy to operate and maintain with no chemicals requirement. The membrane technology in Korea is adaptable to the small drinking water facilities that face problems such as the contamination of water resource, the lack of technical experts, and the low effectiveness. However, membrane technology has not been actually applied to water treatment plant due to insufficient institution of law and the lack of technology. In this study, MF and UF membrane processes were operated to develop KOWACO membrane systems including pretreatment, monitoring system, disinfection. Also, the drafting guideline for design, operation & maintenance were made to apply membrane technology as a drinking water facilities.