• 대한토목학회논문집
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• 제12권1호
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• pp.159-166
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• 1992

Landsat 자료는 그 자체만으로도 가치가 있으며, 이를 양적인 정보로 분류하여 실사용자에게 전수하면 그 가치는 더욱 증대될 것이다. 이러한 관점에서 Landsat 자료로부터 수문 매개변수를 양적으로 산정하고, 이를 이용할 수문학자에게 전수될 수 있는 수문모델을 개발하는 것은 매우 가치가 있다 이 연구는 그러한 목적을 수행하기 위한 첫단계이다. 본 논문은 토지조건과 유출의 관계로 결정될 수 있는 수문모델의 결과와 그 모텔 에 적용할 수 있는 사진영상 및 수치영상의 해석절차를 포함한다. 결국 이 논문은 Landsat 영상이 매우 유용하고 경제적이며, 광역의 유역에서 수문모델에 대하여 충분히 정확한 정보를 제공한다는 것을 보인다.

• 전기학회논문지
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• 제64권6호
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• pp.857-863
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• 2015

OF cable with excellent reliability and economic efficiency, has been used as the main cable of underground transmission in Korea. However, as XLPE cable is excellent in view points such as reduction of loss, convenience on the construction/operation, and manufacturing technology, it has been replaced as instead of OF cable. Also, when the aging occurs in some sections of OF cable, the section is replaced as XLPE cable without changing of whole cable line. However, there are some differences like electrical constants between both types of cables. Therefore if underground transmission system will be operated as combined connection composited of both cables, it should be proved that overvoltage is stable in steady and transient state. This paper describes the effectiveness of connection operation in combined OF and XLPE cable. For the evaluation of effectiveness, some important analysis such as sheath component voltage, lightning and switching overvoltage, single line-to-ground fault are carried out in steady and transient state. EMTP/ATPDraw is used for modeling and analysis of system.

• Journal of Electrical Engineering and Technology
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• 제13권6호
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• pp.2245-2253
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• 2018

With the increase of electrical consumption and the unbalance of power demand and supply, power reserve rate is getting smaller and also the reliability of the power supply is getting deteriorated. Under this circumstance, the electrical energy storage (EES) System is considered as one of essential countermeasure for demand side management. This paper proposes efficient evaluation algorithms of multiple functions for EES systems, especially the secondary battery energy storage systems, in the case where they are interconnected with the power distribution systems. It is important to perform the economic evaluation for the new energy storage systems in a quantitative manner, because they are very costly right now. In this paper, the multiple functions of EES systems such as load levelling, effective utilization of power distribution systems and uninterruptible power supply are classified, and then the quantitative evaluation methods for their functions are proposed. From the case studies, it is verified that EES systems installed at distribution systems in a dispersed manner have multiple functions involved with direct and indirect benefits and also they can be expected to introduce to distribution systems with respects to economical point of view.

• 한국가구학회지
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• 제20권6호
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• pp.590-598
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• 2009

The study of Lurelle Van Arsdale Guild (1898-1986)'s vanity table and stool in the Cooper-Hewitt National Design Museum is essential to understand how the stylistic change was made on industrial design in the 1930s caused by economic necessity. The vanity furniture expresses in such relatively inexpensive image transformations that would attract new customers in the Depression. The objects are donated from a collector and became one of CHM's collections in 1997. In curatorial file, other than the designer's and manufacturer's names there is nothing specified for these objects. Therefore, this study is aimed for researching the exact date for these valuable objects for understanding American Art Deco furniture in the 1930s. Moreover, studying social aspect of these objects gives clear vision for the background. Especially, the History of American Standard (Rodengen, 1999) gives great over view to the history of the manufacturer, C. F. Church Company. The record in Fortune of 1934 suggests the designer, Lurelle Guild's position among other industrial designers at that time. And Profoundly, the objects were assigned design patents. Therefore, the vanity furniture set in the CHM was a significant symbol of early modernism rising from functional areas after the Depression.

• 수산해양기술연구
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• 제48권3호
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• pp.195-207
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• 2012

Fuel consumption in fisheries is a primary concern due to environmental effects and costs to fishermen. Much research has been carried out to reduce the fuel consumption related to fishing operations. The fuel consumption of fishing gear during fishing operation is generally related to hydrodynamic resistance on the gear. This research demonstrates a new approach using numerical methods to reduce fuel consumption. The results from the simulation were verified with results that mirrored the model experiments. By designing the fishing gear using drawing software, the whole and partial resistance force on the gear can be calculated as a result of simulations. The simulation results will suggest suitable materials or gear structure for reducing the hydrodynamic forces on the gear while maintaining the performance of the gear. Furthermore, the efficiency of low energy used trawl as economic point of view will be dealt. This research will helpful to reduce the GHG emissions from fishing operations and lead to reduce fishing costs due to fuel savings.

• 수산해양기술연구
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• 제53권1호
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• pp.98-106
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• 2017

In order to investigate the effect of land reclamation on the life of local fishermen, a survey was conducted with the 246 people living in 12 different adjacent villages located in Hwasung District. It was found that income of residents decreased, while the amount of debts increased after reclamation. 65% of the people surveyed answered that their economic situation became worse than before and they blamed the decrease of fishery resources as the main cause. It further led to the loss of the family's means of livelihood. 40% of the people surveyed claimed that they wanted to leave the fishing village and believed that reclamation divested them of all their hope for the future. Regarding to the effect of reclamation project on the image of Hwasung District, most of the respondents have a negative view on the reclamation project. They have negative views even on the tourism, regional welfare, employment of community residents and local infrastructure. Therefore, it can be concluded that local community residents thought that reclamation project had negatively influenced their overall quality of life.

• 한국실내디자인학회논문집
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• 제23권3호
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• pp.100-107
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• 2014

Traditional architectural space, which is a historical cultural heritage must be connected mutually as a organic flow of various elements such as the environment of the time, political background and values, rather than approaching with fragmentary point of view. The Silhak Philosophy, the basis of late Chosun society developed equity thoughts on the basis of ideology of humanism, and it asserted the promotion of technology and industry as a measure to realize the pursuit of truth which is practically useful. Thus, we could verify the possibility of convergent interpretation of cultural technology of Hwaseong architectural space through the humanistic viewpoint of pioneer spirit of Silhak Philosophy which regards human as a main agent of desire of life, and the pursuit of truth which is useful for reality, and the realization of ethical value by aesthetic practicalism. Based on this, the ontological meaning and value of Suwon Hwaseong by the viewpoint of convergence of culture and technology have been drawn as the construction of planned new town by the practice of filial duty, the plan of city space based on rational values, the realization of a metropolis where self-sufficient economic activities are possible, the introduction of thorough construction management system, the introduction of advanced culture and its creative application, and the application of scientifical knowledges and cutting-edge technology.

• Industrial Engineering and Management Systems
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• 제13권4호
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• pp.383-397
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• 2014

Reverse logistics network design issues have been popularly discussed in recent years. However, few papers in the past literature have been dedicated to incentive effect on return quantity of used products. The purpose of this study is to formulate a dynamic nonlinear programming model of reverse logistics network design with the aim of managing the used products allocation by coordinating the collection centers and recovery facilities to warrant economic efficiency. In the optimization model, a fuzzy approach is applied to interpret the relationship between the rate of return and the suggested incentives. Due to funding constraints in setting up the collection centers, this work considers these centers as multi-capacity levels, which can be opened or closed at different periods. In view of the fact that the problem is known as NP-hard, we propose a heuristic method based on tabu search procedure to solve the presented model. Finally, several dominance properties of optimal solutions are demonstrated in comparison with the results of a state-of-the-art commercial solver.

• 한국콘텐츠학회논문지
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• 제11권12호
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• pp.785-799
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• 2011

본 연구는 지역복지를 극대화하는 지방자치시대에 있어 지역주민으로서 갖추어야 할 시민의식 형성에 영향을 미치는 요인들에 대해 파악하였다. 즉, 지역사회 문제인식의 정도, 개인의 가치 및 태도, 그리고 사회활동 참여여부 등이 민주시민의식 형성에 어떠한 영향을 미치고 있는지 살펴봄으로써 지역사회의 상황과 현실에 맞춘 성숙한 시민의식 형성에 기여하고자 하였다. 조사는 용인시에 거주하는 20세 이상의 지역주민 600명을 대상으로 비례확률층화표집 하였다. 연구결과, 경제 환경문제인식, 노인문제인식 등 지역사회문제를 높이 인식하고, 사회적성취욕구, 자아인식, 문화적 가치지향 정도가 높고, 사회활동에 참여할수록 긍정적인 시민의식 형성이 높은 것으로 나타났다.

• Steel and Composite Structures
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• 제11권5호
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• pp.391-402
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• 2011

It is clear from the former researches on reinforced concrete filled steel tubular (RCFT) structures that RCFT structures have higher strength and deformation capacity than concrete filled steel tubular (CFT) structures. However, in the case of actual applications to large-scaled structures, the thin-walled steel tube must be used from the view point of economic condition. Therefore, in this study, compression tests of RCFT columns which were made by thin-walled steel tube or small load-sharing ratio in cooperation with high strength concrete were carried out, meanwhile corresponding tests of CFT, reinforced concrete (RC), pure concrete and steel tube columns were done to compare with RCFT. By the a series of comparison and analysis, characteristics of RCFT columns were clarified, and following conclusions were drawn: RCFT structures can effectively avoided from brittle failure by the using of reinforcement while CFT structures are damaged due to the brittle failure; with RCFT structures, excellent bearing capacity can be achieved in plastic zone by combining the thin-walled steel tube with high strength concrete and reinforcement. The smaller load-sharing ratio can made the reinforcement play full role; Combination of thin-walled steel tube with high strength concrete and reinforcement is effective way to construct large-scaled structures.