• Proceedings of the Korean Information Science Society Conference
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• 2007.06c
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• pp.124-129
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• 2007

지금까지 질의 점을 중심으로 최근접 객체(Nearest Neighbor : NN)를 찾는 다양한 연구가 진행되었다. 하지만 이 방법은 질의 점과 객체의 거리만을 고려하기 때문에 질의 점을 둘러싸고 있는 객체들을 찾을 수 없다는 문제점이 있다. 이것을 해결하기 위해서 제안 된 것이 최근접 주변객체(Nearest Surrounder : NS) 질의 처리이다. 최근접 주변 객체는 질의 점을 둘러싸고 있으면서 가장 가까운 객체들을 찾는 것에 대한 연구이다. 기존의 NS를 찾는 방법은 객체 인덱싱을 위하여 R-tree를 사용하며, 질의 점과 최소경계사각형(minimum bounding rectangle : MBR)이 이루는 각의 범위를 계산한다. 계산 수행 결과 각 MBR들 이 이루는 각의 범위가 겹치는 부분이 발생하면 해당 각 범위 내에서 질의 점으로부터 최소거리에 있는 MBR을 선택해야 하므로 범위별 질의 점과 MBR들의 최대 최소 거리를 구해야 한다. 이러한 범위별 계산 과정은 계산 비용을 높이는 단점이 있다. 따라서 본 논문에서는 NS를 필요로 하는 영역에서 각 범위별 겹쳐지는 MBR들의 꼭지점 좌표만을 비교한다. 이것은 기존 연구에서 계산 비용을 높이는 공통 각 계산 절차를 개선하고, 최대 최소 거리 계산 수행은 생략하여 NS를 찾는다. 제안 기법을 위해 논문에서 사용하는 각 알고리즘은 이전 연구보다 나은 계산비용 절감 효과를 가져 올 수 있다.

• The Korean Journal of Pesticide Science
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• v.18 no.4
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• pp.364-375
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• 2014

This study was carried out to investigate the pesticide efficacy and crop safety among different leafy vegetables applied with foliar spraying under greenhouse and to check extrapolating from some trial data to other minor crops. Leafy vegetables used in this study were: lettuce (Lactuca sativar), leaf broccoli (Brassica oleracea.), chicory (Cichorium intybus.), chinese cabbage (Brassica campestris subsp. napus var. pekinensis), radish (Raphanus sativus), rape (Brassica napus), crown daisy (Chrysanthemum coronarium), edible burdock (Arctium lappa), endive (Cichorium endivia) and mustard greens (Brassica jumcea). Based on the result of control efficacy, all crops were classified into the groups. The results showed the probabilities of extrapolating the control value data of minor crop within the same group. It would be possible to use the pesticides which are already been registered for similar crops to those crops have no registered pesticides.

• The Journal of the Korea Contents Association
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• v.7 no.9
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• pp.44-53
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• 2007

The purpose of this study is to identify the most efficient expression method by analyzing advertising expression method by 16 types of product in internet advertising. First of all, It made inquiries about expression method and attitude of internet advertising for this study and identified a conception, characteristics, and types of internet advertising through literature reviews about internet advertising. This study offered expression the korean alphabet, hangout about banners ads, sponsorship ads, interstitial ads and pop-up ads. This study analyzed advertising expression, advertising effectiveness and advertising attitude by 16 types of product in internet advertising. In conclusion, the marketers of internet advertising have to effort to make internet advertisements that suit their advertising purpose by using the right expression method of internet advertising because they know internet advertising are quite different the expression method, advertising effectiveness, and advertising attitude. And they have to convert negative attitude or medium size attitude of internet advertising into positive attitude in the future.

• Journal of the Korean Society of Propulsion Engineers
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• v.3 no.4
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• pp.12-22
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• 1999

Operation of an electromagnetic shaker system using a Class-D amplifier may cause unacceptable electromagnetic interference to another electronic system, requiring the user to take whatever steps are necessary to correct the interference. A differential amplifier in a Class-D amplifier is used to decrease the effect of a common-mode noise voltage in a shaker system. To prevent a ground loop, a transformer is inserted in another shaker system. These methods show reduction of the unwanted vibration which has occurred before. A transformer in a charge amplifier was used to prevent a ground loop in a shaker system using a Class-AB amplifier a few years ago, but it was susceptible of noise in a shaker system using a Class-D amplifier. Hence we corrected a ground loop between a charge amplifier and a vibration control/analysis system without a transformer. The usefulness of this approach is illustrated by the results of experiments.

• The Journal of the Korea Contents Association
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• v.17 no.12
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• pp.236-246
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• 2017

As a research on culinary staffs' subjective perception of star chefs' appearance in cooking broadcast, this study analyzed the subjective tendency targeting culinary staffs in hotels & restaurants by applying Q methodology. Three research questions of this study were set up like below. First, what are the culinary staffs' acceptance types of subjective perception of star chefs' appearance in cooking broadcast? Second, what are the characteristics of homogeneous type of culinary staffs' subjective perception of star chefs' appearance in cooking broadcast? Third, what are the things in common and differences of culinary staffs' each subjective perception type of star chefs' appearance in cooking broadcast? In the results of typological analysis based on such research questions, total four types were drawn such as Acquiring expertise through cooking broadcast type(Type1, N=8), New broadcast genre recognition type(Type2, N=10), The profession of the chef reality recognition type(Type3, N=2), and Profession image of chef synergy type(Type4, N=2). Each type showed its own distinctive characteristics.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.8C
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• pp.583-590
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• 2008

In this paper, we present a spatially adaptive post-processing algorithm for H.264 video coding standard to remove blocking artifacts. The loop filter of H.264 increases computational complexity of the encoder. Furthermore it doesn't clearly remove the blocking artifacts, resulting in over-blurring. For overcoming them, we combine the projection method with the Constraint Least Squares(CLS) method to restore the high quality image. To reflect the Human Visual System, we adopt the weight norm CLS method. Particularly pixel location-based local variance and laplacian operator are newly defined for the CLS method. In addition, the fact that correlation among adjoining pixels is high is utilized to constrain the solution space when the projection method is applied. Quantization Index(QP) of H.264 is also used to control the degree of smoothness. The simulation results show that the proposed post-processing filter works better than the loop filter of H.264 and converges more quickly than the CLS method.

• Journal of Digital Convergence
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• v.15 no.10
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• pp.63-81
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• 2017

Objectives of this study are to analyze the previous research perfomed in the Bus Information System (BIS) area and to suggest future research directions. This is a very meaningful and important work. To accomplish this, this study (1) summarizes the concepts of BIS, (2) establishes a research framework to be used to analyze the previous studies in the area, and (3) identifies and suggest trends and future directions of the BIS research. This study has identified total of 68 article (22 foreign and 46 domestic) using 'Google Scholoar' search engine. Major research results include (1) since non-empirical research is dominant, more explanatory empirical research is needed in the future, (2) research that provides consistent and comprehensive measures for BIS related constructs (e.g., BIS quality) is needed, and (3) impacts on the stakeholders of BIS not reflected in the current research (e.g., bus drivers, administrative agencies) should be analyzed in the future research.

• Journal of the Korean Institute of Intelligent Systems
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• v.13 no.2
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• pp.192-199
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• 2003

Agents in multi-agent systems (MAS ) are required to achieve their own goals. An agent s goal, however, can conflict with others either when agents compete with each other to achieve a common goal or when they have to use a set of limited resources to accomplish agents divergent goals. In either case, agents need to be designed to reach a mutual acceptable state where they can avoid any goal conflicts through negotiation with others to achieve their goals. In this paper, we consider a BDI agent architecture where belief, desire, and intention are the three major components for agents mental attitudes and represent resource-bounded BDI agents in logic programming framework. We propose a negotiation algorithm for BDI agents solving their problems without goal conflicts in distributed cooperative environments. Finally, we describe a simple scenario to show the effectiveness of the negotiation algorithm implemented in a negotiation meta-language.

• The Journal of the Korea Contents Association
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• v.11 no.1
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• pp.113-122
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• 2011

Visual images are very close to our living and we make decisions and choose behavioral options with the visual images on mass media. In current-affair documentary programs, interviews have potential effects that can change public opinions on important issues. Therefore, it's a consequence that the study examined how different expressions of visual images in documentary. Using preceding research methods, this study focus on form, color, movement and depth of visual images. This study analyzed quantitatively all interview shots with 15 current-affair documentary programs from major TV stations such as KBS, MBC and SBS. The findings of the study are 1) half of interview shots used the visual image expressions to hide interviewees' face according to the shield law, 2) choosing close-up shots in company with bust shots, 3) using natural lights and hand-held camera techniques for interviews, and 4) showing wide angles without depths of visual image.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.7 no.4
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• pp.143-148
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• 2012

The problem of common difficulties for the implemented business that imposing the Value Engineering(VE) is crucial. Because of the difference in effect of VE by how an abstract concept as function digitize. Furthermore, to improve achievement of VE,, the advancement of VE is demanded. The most of business conducting the VE is pushing this method with the purpose of cost reduction. As explaining this product, the cost occupies the desktop of F1 and the component of product 54% with the result of analyzing the coefficient of functional requirement. Then the functional cost can be confirmed. Through the result of this study, the fact that the desktop, the bluetooth, the probe occupy the most of products with satisfying the function is able to confirm. An effort for cost reduction in purchasing through adjusting a stable quality demanded for the cost reduction is needed. Also, another effort of proper price reduction by diversification of buyer business is needed also.