• Journal of Korea Water Resources Association
• /
• v.46 no.11
• /
• pp.1103-1113
• /
• 2013

In this study, determination methods of the pressure monitoring location in water distribution system were introduced and applied to sample pipe network. The best determination method of the pressure monitoring location was suggested and applied to the real city pipe network. Three kinds of determination methods of pressure monitoring locations are categorized such as the sensitivity analysis according to changing roughness coefficient, pressure contribution analysis, and sensitivity analysis according to changing demand. Further-more, pressure contribution analysis and sensitivity analysis from the results of unsteady analysis were conducted and compared each other. From the results, the most accurate and simplest method was selected in this study. Therefore, the best method can be applied for the pressure management or leakage detection as a determination method of pressure monitoring location in water distribution system.

• 프린팅코리아
• /
• v.10 no.11
• /
• pp.110-111
• /
• 2011

어려움을 겪고 있는 인쇄산업에 조금이나마 도움이 될 소식이 전해졌다. 동반성장위원회(위원장 정운찬)가 최근 발표한 '중소기업 적합업종, 1차선정 품목 16개에 인쇄업이 포함되었기 때문이다. 동반성장위원회는 지난 5월 중소기업을 대상으로 업종신청을 받은 234개 중 45개를 1차로 걸러냈고 지난 9월말에 16개를 우선 1차로 선정했다. 중소기업 적합업종으로 선정되면 향후 3년간 대기업과 중소기업간 협의를 통해 대기업의 사업철수 내자는 확장 자제가 이뤄지게 된다. 이 제도는 대기업의 무분별한 사업영역 확대 자제를 통한 대 중소기업 간 동반성장를 고려한 최적의 조치라고 평가받고 있으며 전통적인 중소기업업종인 인쇄업으로서도 선정된 것은 당연하면서도 다행스러운 결과라 할 수 있다.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 1992.04b
• /
• pp.615-624
• /
• 1992

비디오의 주행계의 안정성은 비디오 품질의 중요한 요소로서 이에 영향을 주는 인자들은 다양하며 여러 인자들이 복합적으로 작용하여 비디오 테이프의 주행상에 영향을 준다. 본 연구에서는 D전자회사의 비디오 주행경로의 변동을 최소화하기 위하여 어떠한 인자를 제어하는 것이 필요한지 주요 인자의 선정문제를 회귀분석을 이용하여 결정하는법, 선정된 인자의 최적수준 조합을 결정하는 문제를 해결하는 절차와 부품의 조립허용공차의 선정절차를 제시한다.

• Journal of the Korean Institute of Gas
• /
• v.18 no.2
• /
• pp.1-9
• /
• 2014

To develop a coalbed methane(CBM) reservoir, it is important to apply production methods such as drilling, completion, and stimulation which coincide with coal properties. However, the reliability of the selected resulted in most of CBM field is not enough to accept because the selection of production method has been done by empirical decision. As the result, the empirical decision show inaccurate results and need to prove using simulation whether it was true exactly. In this study, the intelligent system has been developed to assist the selection of CBM production method using artificial neural network(ANN). Before the development of the system, technical screening guideline was analyzed by literature survey and the system to select drilling and completion method, and hydraulic fracture fluid was developed by utilizing the guideline. The result as a validation of the developed system showed a high accuracy. In conclusion, it has been confirmed that the developed system can be utilized as a effective tool to select production method in CBM reservoir.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.7 no.4
• /
• pp.82-92
• /
• 1997

In this paper, a fuzzy measure and integral-based model fnr interactive systems is proposed. The processes of model identification consists of the following three steps : (i) structure identification (ii) parameter identification and (iii) selection of an optimal model. An algorithm for the model structure identification using the well-known genetic algorithm ((;A) with a modified selection operator is proposed. A method for the identification of par;imetcrs corresponding to fuzzy measures is presented. A statistical model selection criterion is used for the selection of an optimal model among the candidates. Finally, experimental results obtained hy applying the proposed model to the subjective evaluation data set and the well-known time series data are presented to show the validity of the proposed model.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.16 no.7
• /
• pp.1559-1566
• /
• 2012

This paper proposed the method to find out the optimal sensing point of temperature in test-bed with the sensor of temperature, such as real residence. We selected optimal locations by checking temperature change which was simulated by the means of CFD (Computational Fluid Dynamics) and the variation of air flow. We made 3-dimensional model of the testbed using DesignBuilder software, and ran the CFD. We selected the optimum temperature measurement location of 1.5 m height from the floor and low temperature variation. The experiments were conducted 30 temperature and humidity sensors in real place. After that, we confirmed the results of temperature change.

• Journal of Korea Water Resources Association
• /
• v.41 no.6
• /
• pp.619-628
• /
• 2008

Bank protection is a structure constructed to protect directly embankment breakage and erosion by river flow. Traditionally, the type of bank protection has been decided by practitioner's subjective and empirical judgement, which often causes problems after construction. Recently, however, it becomes important to consider not only physical protection but also environment. Various types of bank protection for environment-friendly river are now available. Thus, there is a need for more objective and quantitative decision method for bank protection work. This study adopts the analytic hierarchy process (AHP) to improve the objectiveness in the decision of bank protection work. Criteria for stability, economy, construction, environment are identified and a standardized process is presented for field application. With the proposed method, one can prioritize various bank protection works and make the optimal decision. We believe that the method can serve as a useful tool for river engineers in practice.

• Journal of Korea Water Resources Association
• /
• v.40 no.12
• /
• pp.931-941
• /
• 2007

Traditionally, the decision of river width has aimed majorly at flood control and good river conveyance. And the river width has been decided by practitioner#s subjective and empirical opinion. Recently, however, there is a need for more objective and thus quantitative decision method for decision of river width considering not only economical aspect but also social or environmental aspect. This study adopts the analytic hierarchy process (AHP) to improve the objectiveness in the decision of river width. Criteria and a standardized process are presented for field application. Using the proposed method, one can prioritize various river width and make the optimal decision. We believe that the method can serve as a useful tool for river engineers in practice.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.21 no.8
• /
• pp.1575-1580
• /
• 2017

The electric vehicle business is important because it can reduce 30% of the fine dust generated in the metropolitan area and it can solve the air pollution problem by replacing automobile exhaust gas from an internal combustion engine with eco-friendly electric cars. For the construction of the electric charging station infrastructure, which is the core part of the electric car business, we focus to select the optimal location of the electric car charging station in Seoul. The goal of this paper is to utilize and analyze the traffic statistics of T-Map navigation users data and Seoul Metropolitan Transportation Policy Department to deploy the electric cars charging station with optimal location to increase the efficiency. In this paper, the proposed algorithm is composed of two parts of electric charging station selection. First, we analyze real traffic statistics and area. Second, we utilize T-Map navigation data distribution. To select optimal electric charging station location, we apply these two algorithms.

• Spatial Information Research
• /
• v.11 no.3
• /
• pp.241-249
• /
• 2003

The purpose of this paper is to provide the basic data to select the most proper site, which is essential for the economic activation of North Korea by means of the GIS tool. In this purpose, firstly, Nampo area is sampled as model case, classifying the factors into the natural environmental one and socio- cultural one. Secondly, to analyze the land use status and topographic status which is essential for natural environment factor. Besides USLE(Universal Soil Loss Equation), which is one of the disaster effect assessments, is being applied to suggest the selection method for minimizing the environment change by way of assuming the land effluence amount. The started could advance to prove the ideal model in selecting the most suitable site while minimizing the environmental change by means of the composite tool of GIS and USLE.