• Journal of the Korea Institute of Military Science and Technology
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• v.21 no.2
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• pp.225-234
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• 2018

In this paper, we consider a problem of partitioning a search area into smaller rectangular regions, so that multiple platforms can conduct search operations independently without requiring unnecessary coordination among themselves. The search area consists of cells where each cell has some prior information regarding the probability of target existence. The detection probability in particular cell is evaluated by multiplying the observation probability of the platform and the target existence probability in that cell. The total detection probability within the search area is defined as the cumulative detection probability for each cell. However, since this search area partitioning problem is NP-Hard, we decompose the problem into three sequential phases to solve this computationally intractable problem. Additionally, we discuss a special case of this problem, which can provide an optimal analytic solution. We also examine the performance of the proposed approach by comparing our results with the optimal analytic solution.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2004.04a
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• pp.541-546
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• 2004

This study compare the coordination and area between cadastral map digital data corrected by normal nap and serial cadastral map edited by formal data. By superposition ortho image made from aerial photo to serial cadastral map, we propose the method to improve the confidence and use the ortho image efficiently in cadastral part.

• ETRI Journal
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• v.29 no.3
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• pp.393-395
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• 2007

Analytic modeling and computational simulation for the protection of DTV from cognitive radio interference are performed. Protection is achieved by using the protection ratio, which is derived through system modeling and its analysis. On the frequency coordination between digital TV and cognitive radio, an analysis in a co-channel environment, in a rural area in Korea, is performed.

• Proceedings of the KIEE Conference
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• 2004.11d
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• pp.37-39
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• 2004

To restrain abnormal voltage and effective operation in protect system, some of customer in Korea earth their own transformer in 154kV power system. The above ground system has some problems if ground fault occurs in other related area such as ground relay errors, under count register in two element register system. There for most huge customers opens the ground neutral and it causes errors in insulate and protection coordination and register system. In this paper presents the solution for above system.

• Journal of Korean Institute of Industrial Engineers
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• v.4 no.1
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• pp.5-10
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• 1978

In this paper it was attempted to design a system for the effective development of electronics industry by use of systems management concept. For the design of this system, current status of electronics industry was analyzed; problem area was derived through this analysis and developmental strategy was determined. As an organization for centeralized coordination, "Electronics Industry Committee" was proposed. The committee controls three specialized organizations such as R&D center, marketing management center, and council for political support. Each function of these special organizations was introduced and special role as a system manager was described.

• The Research Journal of the Costume Culture
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• v.15 no.3 s.68
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• pp.369-382
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• 2007

The purpose of this study was to propose the strategy for increasing the merchandising power of the SPA brand to improve the competitiveness of domestic fashion industry. A questionnaire survey was administered to 270 SPA brand customer who live in Seoul Metropolitan area and Gyeongi-do area. 240 data were analyzed by factor analysis, t-test, crosstabs analysis, and one-way ANOVA using SPSSWIN 12.0 program. The result were as follows: Importance of store attributes were categorized in five factors: store environment, service, product sales promotion, and convenience. A consumer's the importance of store attributes was significantly different depending on that consumer's demographic characteristics(major, grade etc..) and general product purchasing characteristics(purchasing expense). This result should not be interpreted by expanding to the whole group of the consumer in SPA brand, as the sample used in this study is limited to those in Seoul and GyeongGi area.

• Journal of the Korean Home Economics Association
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• v.42 no.10 s.200
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• pp.53-61
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• 2004

The purpose of this study was to provide information for the manufacturers of shoes for males to develop more adequate footwear. The data was collected through a questionnaire on purchasing and wearing practices of footwear, and overall satisfaction with the shoes for males. The questionnaire survey was conducted on 237 male adults in the Cheongju area. Most of the respondents were commuting by their own cars and the average walking time in their shoes was five minutes per day. The main reasons for buying new footwear were to replace the worn out footwear or to adapt the color and design coordination with other apparel. Males generally bought footwear from sports brand retailers and individual footwear stores. The criteria for purchasing in order of considered were size, design, price, comfort, and style coordination. During the spring, autumn and winter seasons, the footwear of first choice was ordinary shoes, followed by exercise shoes, but during the summer season they wore sandals next to the ordinary shoes. Regarding the form of the shoes, they preferred classic models with round front and strings. They were satisfied with the design, color and size of the shoes, but the price, quality and durability of the material were considered to be unsatisfactory.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.60 no.5
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• pp.921-928
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• 2011

This paper presents a new method of local voltage control to achieve coordinative control among UPFC(Unified Power Flow Controller) and conventional reactive compensation equipments, such as switched-shunt and ULTC(Under-Load Tap Changing) transformer. Reactive power control has various difficult aspects to control because of difficulty of system analysis. Recently, the progress of power electronics technologies has lead to commercial availability of several FACTS(Flexible AC Transmission System) devices. The UPFC(Unified Power Flow Controller) simultaneously allows the independent control of active and reactive power flows as well as control of the voltage profile. When conventional reactive power sources and UPFC are used to control system voltage, the UPFC reacts to the voltage deviation faster than the conventional reactive power sources. Keeping reactive power reserve in an UPFC during steady-state operation is always needed to provide reactive power requirements during emergencies. Therefore, coordination control among UPFC and conventional reactive power sources is needed. This paper describe the method to keep or control the voltage of power system of local area and to manege reactive power reserve using PSS/E with Python. The result of simulation shows that the proposed method can control the local bus voltage within the given voltage limit and manege reactive power reserve.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.3
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• pp.36-40
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• 2011

OFDM technology is already commonplace in the current mobile communication system environment. However, inter-cell interference causes many problems in the cellular system as seen from the problem caused by the surge in the use of smart phones. In this paper, we will research how user distribution influences a performance of a conventional proposed algorithm in the certain cell area and confirm it through computer simulations. As a result, we proved that there is an appropriate user distribution in the cell. In addition, it has an effect on the performance of inter-cell interference coordination.

• Fashion & Textile Research Journal
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• v.10 no.2
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• pp.236-241
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• 2008

Hair manicure is usually and widely operated in the area of hair-dyeing by the reason that acidic hair color is less damaged and more stable than other chemical color treatment. However, there is no an in-depth study to prove them. This study purposes to provide basic resources for effectively using products of hair manicure by experiments on Physical Properties of Hair. Hair of one healthy woman in mid-20's, Level 4, was sampled for experiments. For the tests, hair samples were classified by the frequency of hair manicure treatment The control group(a), once treatment(b), twice(c), three times(d), four times(e) and five times(f). The results were measured with Scanning Electron Microscopy(SEM) and Tensile Strength and Elongation test. The lower Values of Tensile Strength according to repeated hair manicure treatment. Elongation is not affected by the frequency of hair manicure treatment. There was no remarkable change of hair surface in once(b) and twice(c) treatment. The change of hair surface which was able to judge by cuticle layers looseness, tunics and the transformation of cuticle cell were observed in the hair samples operating more than three times(d) of hair manicure treatment.