• Journal of the Korean GEO-environmental Society
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• v.14 no.4
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• pp.15-27
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• 2013

In order to plan out the Daegu G membrane filtration water treatment plant, water quantity, water quality and process stability were evaluated using the field pilot-scale tests, during the six months of continuous operation, including low water temperature period. The field model experiments, which were carried out according to the Installation Criteria of Ministry of Environment, consisted of two series : series 1 - water quality verification, and series 2 - membrane process evaluation. The process water quality met all drinking water standards with less than 0.03 NTU. Moreover, process operation showed a stable membrane pressure with 99% of recovery ratio. This shows that the tests were properly designed in terms of the influence of water loading and temperature. In conclusion, the purpose of this study is to establish core technology for advanced drinking water treatment, through on-going accumulation of engineering and construction know-how.

• 전기의세계
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• v.41 no.10
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• pp.30-37
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• 1992

우리나라에서의 공항시설의 자동화는 항공산업의 발전과 더불어 조속히 이룩해야 할 과제이다. 단기적으로는 기존공항의 전기설비를 중심으로 한 분야별 자동화설비의 정비와 상호 데이타링크 내지는 중앙감시제어시스템을 설치하는 것이다. 장기적으로는 수도권 신공항 건설계획과 발맞추어 공항시설의 종합자동화 시스템을 구축하여 공항관련 모든 시설과 정보를 통합관리하는 방안으로 추진토록 하겠다.

• Proceedings of the SAREK Conference
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• 2006.06a
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• pp.95-98
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• 2006

Filtration by fibrous filter is one of the Principle methods used for removing pollutant particles in the liquid. Because of the increasing need to protect both human health and valuable devices from exposure to fine particles, filtration has become more important. Filters have been developed with modified surface charge characteristics to capture and adsorb particles by electrokinetic interaction between the filter surface and particles contained in water. The main purposes of this study are to develop and evaluate the performance evaluation of the apparatus for making a positively charged porous filter media and to analyze the surface characteristics of the filter media for capturing negavitely charged contaminants mainly bacteria and virus from water. The experimental apparatus consists of a mixing tank, a vacuum pumping system, a injection nozzle, a roller press and a controller. The filter media is composed of glass fiber(50-750 nm), cellulose($10-20{\mu}m$) and colloidal charge modifier. The characteristics of filter media is analyzed by SEM(Scanning Electron Microscopy), AFM(Atomic Force Microscopy) and quantified by measuring the zeta potential values.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.1
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• pp.70-77
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• 2001

This paper present a fuzzy mxlel of describing reacton features for ozon contactor in advanced water treatn-ent systems. Input and output variables are chosen by considenng the object of ozon processing and several parameters related to management of water quahty. Dissolved organic carbon concentration, $UV_{254}$ absorptIon and $KM_NO_4$ consumption are proposed as common variables in input and outp.lt variables. Furthermore own concentration, raw water's temperature and contact time are suggested as input variables, Membership hmctions for input variables have triangular type share and the grades in each lrembership function are determined by investigating process data gathered at pilot planl The decision parts of fuzzy model have linear combination form of input variables and coefficients included in such linear equations are computedd with process clata in the sense of least square error Also fuzzy trodel suggested in this paper is partitioned by 3 independent fuzzy rnxlels using the characteristics of having no interactions armng output variables. As a result, such fuzzy mxlel has rrerits in computation and comprehension. According to simulatIon results, fuzzy moIel's outputs give almost similar data to process output under same input conditions.

• Journal of Digital Contents Society
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• v.3 no.2
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• pp.221-233
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• 2002

In this paper, we present integer programming models and algorithms for the Capacitated Facility Location-Allocation Problem (CFLP). The models and algorithms can be used for the design of logistics networks and for the location of telecommunication facilities. We are given a set of candidate facility installation sites, one type of facility for each candidate site with its capacity and installation cost, a set of customers with their demand requirement, and flow cost for one unit of demand flow from each customer to each candidate site. (CFLP) is to determine the number of facilities for each candidate site and the set of customers which are connected to each site with minimum cost, while satisfying the demand requirement of each customer and constraints imposed on the allocation of customers to facilities. We present two integer programming models for (CFLP), and devise a branch-and-cut algorithm and a branch-and-price algorithm for the problem.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.214-216
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• 2008

현재 전력수급기본계획은 전국을 한일권으로 하여 발전계획을 수립하고 송변전설비계획을 수립하고 있다. 그러나 발전설비와 송변전설비는 하나의 망으로 연결되어 상호 보완적 영향을 주기 때문에 수급계획시 두 설비를 동시에 평가하는 것이 무엇보다 중요하다. 본 논문에서는 혼합정수형 선형계획법(MIP)을 이용하여 발송전 전력설비를 통합적으로 최적 구성할 수 있는 방안에 대하여 분석하였다. 전력수급기본계획 수립시 제출된 건설의향설비에 대해 송변전설비와 통합하여 적정 예비율을 갖는 최적설비 구성방안을 수립하고, 이때의 설비투자비와 운전비를 분석하였다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.33 no.4
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• pp.23-26
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• 2004

국내$.$외 공기청정기 시장 현황과 개발 동향을 살러보고, 아울러 공기청정기에 적용한 기술과 공기청정기 제품을 간략히 소개한다. 현대인들은 생활이 윤택해짐에 따라 개인과 가족의 건강을 생각하고 즐거운 인생을 살기 위해 노력한다. 이러한 사회적인 흐름에 의해 잘 먹고,잘 살자는 웰빙(Well Being)족이 출현하게 되었고, 건강가전에 대한 소비도 증가하게 되었다. 건강가전은 정수기, 공기청정기, 비데, 연수기, 산소 발생기 등을 꼽을 수 있으며 이중에서 봄철에 가장 관심을 갖는 제품이 공기청정기이다. (중략)

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.6
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• pp.73-81
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• 2001

This study uses the distributed parameter systems resented by the spatial discretization technique. In this paper, the distributed parameter systems are converted into lumped parameter systems, End fast Walsh transform and the Picard's iteration method are allied to analysis the state of the systems. This thesis presents a new algorithm which usefully exercises the optimal contro1 in the distributed parameter systems. In exercising the optimal control of the distributed parameter systems, the excellent consequences are found without using the existing decentralized contro1 or hierarchical control method. This study can be applied to the linear time-varying systems and the non-linear systems. Farther researches are required to solve the problems of convergence in case of the numerous applicable intervals. The simulation proves the effectiveness of the proposed algorithm.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.2099-2100
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• 2011

본 논문은 ${\circ}{\circ}$댐에서 원수를 공급받는 ${\circ}{\circ}$정수장(이하 정수장) 유입관로의 잉여압력을 이용하여 소수력 발전기를 설치하고, 정수장 여유부지에 태양광발전설비를 계획하여 총163.4kW(Peak 사용전력 128.16kW)의 시설용량으로 연간전력사용량(451 MWh) 대비 110% 정도의 발전생산(약500MWh)이 가능한 에너지자립형 개념의 정수장을 설계한 사례이다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.306-307
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• 2011

제 4차 전력 수급 기본 계획에 의하면 2022년 계통에는 총 32기의 원자력 설비와 신재생 설비 용량의 약38%를 차지하는 풍력 설비가 신규 도입 된다는 것을 확인 할 수 있다. 하지만 원자력과 신재생에너지원은 화력 설비에 비해서 부하추종 능력이 저조하여 이 두 설비의 비율을 높이면 계통 운영에 심각한 문제를 발생 시킬 수 있다. 이에 본 논문에서는 2022년 off-peak 계통 상황에서의 원자력 설비 32기가 모두 연계되었을 때, 계통 주파수의 안정도를 분석하고자 하였다. 이를 위해 계통에서 사용하는 각종 정수를 추정하고 이것을 이용하여 주파수 분석 시뮬레이션 tool을 통해 주파수 변화를 모의 하였다. 최종적으로 2022년 계통에서의 최적 전원 설비 구성을 제안하고자 한다.