• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.24-26
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• 2006

본 논문에서는 브랜치 교환(Branch Exchange) 방법을 이용하여 배전 계통을 재구성하는 문제에 대하여 연구하였다. 최적 재구성 문제는 선로 절체에 따라 달라지는 모든 가능한 계통 구성들에 대해 선로손실, 전압조건을 계산하고 이들 중 최적인 구성을 찾아내는 것이다. 하지만 빠른시간 내에 이에 대한 해를 찾기란 대단히 어렵다. 그 이유는, 계통내에 수많은 연계개폐기와 구분개폐기들이 존재하고 이들로서 방사상의 운전조건을 만족해야 하기 때문이다. 따라서 본 연구에서는 시간적으로 가장 유리한 특성을 갖는 브랜치 교환법을 이용하여 시스템 전체 손실이 감소하고 방사상 운전조건과 전압의 제약조건을 만족하도록 최적화하는 방안을 구현하고자 한다.

• Electric Engineers Magazine
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• v.210 no.2
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• pp.28-35
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• 2000

빗물펌프장은 지역침수로 인한 피해를 방지 또는 최소화시키는 것을 목적으로 한 비상 시설물이며 재해대책 시설로서 그 중요성이 커지고 있다. 여기에 그 시스템 운영에 있어서 중추적인 역할을 담당하는 기계, 전기설비 시스템의 최적화, 효율 화는 필수적이며 설비 자체의 안전과 시스템 운전안전 확보가 우선되므로 과잉설비로 계획되어 경제적인 시스템 구축이 간과될 소지가 많다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2002.05b
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• pp.271-272
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• 2002

하수 또는 폐수의 재이용시 사용되는 역삼투막설비의 전처리공정으로 사용되는 연속식정밀여과기의 전단에 PAC와 같은 응집제를 10ppm 투입하고 역세주기를 20분으로 하여 막오염을 최소화함으로써 재이용 시스템의 안정적인 운전이 가능하였다.

• 한국가스학회:학술대회논문집
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• 2004.11a
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• pp.35-42
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• 2004

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.29 no.2
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• pp.32-38
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• 2000

중앙냉방시스템의 에너지 절약을 위해서는 실내외의 환경변화에 따라 시스템제어변수들인 최적의 운전조건들을 선정할 수 있고, 온라인으로 실제 적용이 용이한 최적화 기술이 필요하며, 이를 통한 효율적인 에너지 관리시스템의 구성이 이루어져야 한다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.2 no.4
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• pp.271-273
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• 1973

에너지 사용의 최적화는 건축설비계통의 각 관점을 다른 모든 사항들과 비교고찰하는 (설치비에 대응하는 장기운전 및 정비의 요구사을 고려하는) HVAC계통설계로부터 얻어 진다. 저자는 최상목표인 쾌적과 경제성을 고려해서 전반적으로 각 분야를 집약한 계통설계의 프로그램을 제시하고 있다.

• Korean Chemical Engineering Research
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• v.45 no.3
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• pp.234-241
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• 2007

To achieve safe operation and to improve economics it is imperative to monitor and analyse demand and supply of utilities and to meet utility needs in time. The main objective of motor/turbine processes is to manipulate steam and electricity balances in utility plants. The optimal operation of motor/turbine processes is by far the most important to improve economics in the utility plant. In order to analyse motor/turbine processes, we need steady state models for steam generation equipments and steam distribution devices as well as turbine generators. In addition heuristics concerning various operational situations are required. The motor/turbine optimal operation system is based on utility models and operational knowledgebase and provides optimal operating conditions when the amount of steam demand from various steam headers is changed frequently. The optimal operation system also produces optimal selection of driving devices for utility pumps to reduce operating cost.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.5
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• pp.1-11
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• 2000

A control system using a programmable logic controller (PLC) has been developed for a dual tower dryer (DTD) in a canadian deuterium natural uranium reactor (CADND) type nuclear power plant. This system will replace the existing DTD control system which was implemented with mechanical timers and relays. The new control system makes it possible for an operator to perform more precise time and dew point control for the DTD, thanks to the high efficiency and flexibility of the PLC. The operational cost for the control system is much reduced compared to the existing system.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.15 no.2
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• pp.49-56
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• 2001

This paper describes the improvement of passenger's comfort by analyzing the debasement of early adapted ATO control pattern. First we give the characteristics of ATO controller, principle of running control, distance & velocity calculation methods used mainly in INCHEON subway UNE 1 and then analyze the ATO control pattern. For early control pattern, we reviewed it in view of passenger's comfort while keeping the track conditions. In order to achieve the improvement of passenger's comfort we propose the modification of early ATO control pattern based on JERX characteristics. Simulation and application test are performed to prove the effectiveness of modified ATO control pattern.

• Journal of Energy Engineering
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• v.23 no.2
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• pp.62-73
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• 2014

This research was focused to apply response surface methodology for optimization of bio-methane production by biogas upgrading process. Methane concentration(Y1) and methane efficiency(Y2) on biogas upgrading process were mathematically described as being modeled by the use of the Box-Behnken design on response surface methodology. The results of ANOVA(analysis of variance) about models, the probability value of the methane concentration and methane recovery response surface model are 0.0001 and 0.0001, respectively and coefficient of determination($R^2$) are 0.9788 and 0.9710, respectively. The response surface model is proved of high reliability and suitability. The operation pressure had the greatest influence to methane concentration than other operation parameters and the PSA rotary valve velocity had the greatest influence to methane recovery than other operation parameters. Optimal condition of biogas upgrading process for production of $100Nm^3/hr$ bio-methane were operation pressure 8.0bar and outlet flow rate 31.55RPM, respectively. At that operation condition the methane concentration of bio-methane was 97.13% and methane recovery in biogas upgrading process was 75.89%.