• 한국국방경영분석학회지
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• 제23권1호
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• pp.88-99
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• 1997

Due to the various requests from consumers and rapidly changing market, the product design is continuously changing and the new products are manufactured in various forms. To satisfy this condition, companies must make the product design robust with better quality. However, considering many parameters and increasing the level of each parameter in product design can lead us to a difficult situation. In order to solve this problem, this paper attempts to develop an algorithm that takes into account more parameters and increased level of parameters using Genetic Algorithms. As a result of this study, we can use this algorithm for designing the parameters of new product since it can search the level of parameters in more detail and wider range.

• Journal of Electrical Engineering and Technology
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• 제9권2호
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• pp.379-389
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• 2014

Low frequency oscillations (LFOs) are load angle oscillations that have a frequency between 0.1-2.0 Hz. Power system stabilizers (PSSs) are very effective controllers in improvement of the damping of LFOs. PSSs are designed by linearized models of the power system. This paper presents a new model of the power system that has the advantages of the Single Machine Infinite Bus (SMIB) system and the multi machine power system. This model is named a single machine normal-bus (SMNB). The equations that describe the proposed model have been linearized and a lead PSS has been designed. Then, particle swarm optimization technique (PSO) is employed to search for optimum PSS parameters. To analysis performance of PSS that has been designed based on the proposed model, a few tests have been implemented. The results show that designed PSS has an excellent capability in enhancing extremely the dynamic stability of power systems and also maintain coordination between PSSs.

• 대한전자공학회논문지SP
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• 제43권1호
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• pp.1-8
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• 2006

본 논문은 다중 참조영상(multiple reference image)에 적용 가능한 새로운 고속 전역탐색 움직임 추정 기법을 제안한다. 제안된 방법은 기존의 비트율을 고려한 연속제거알고리즘(rate constrained successive elimination algorithm: RSEA)을 다중 참조영상에 확대 적용하는 방법이다. 첫 번째 참조영상에 대한 움직임 추정의 계산량에 비해 그 이후 참조영상에 대한 움직임 추정의 계산량이 적어질 수 있음을 보일 것이다. 계산량 감축을 위해, 본 논문에서 최적 움직임 벡터의 후보 블록의 개수를 감소시킬 수 있는 새로운 조건을 소개한다. 실험 결과을 통해 제안된 방법이 기존의 RSEA과 동일한 움직임 추정오차를 가지면서도 계산량을 감소시킴을 보일 것이다.

• 벤처창업연구
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• 제6권4호
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• pp.39-57
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• 2011

본 논문***은 청년창업가의 창업기회원천을 분석하여 기회탐색의 성격을 연구함을 그 목적으로 한다. 이를 위해 창업기회요인으로 창업의지, 창업기회 발생배경, 창업기회단서, 창업기회단서의 접촉상황, 사업아이디어 활용, 창업자본금 중 자기자본비율의 여섯 가지 변수를 사용하였다. 탐색적 조사를 위하여 서울시 "청년창업 1000프로젝트" SBA 강남청년창업센 터의 청년창업가를 대상으로 설문자료 182개를 획득하였고, SPSS Win Ver. 18.0 프로그램을 사용하여 빈도분석과 변수간 관계성을 검정하기 위하여 독립성 검정을 하였다. 연구결과는 첫째, 창업의지의 성격 조사에서 의도적 창업이 87.4%의 비율로 기존 연구와는 차별된 결과를 보여주었다. 둘째, 창업기회 발생배경은 교육을 통한 비율이 기존 연구에서보다 확연히 증가되었음을 확인할 수 있었다. 셋째, 창업기회단서의 접촉상황을 조사한 결과는 기존연구와 달리 응답자의 절반에 가까운 숫자가 탐색적으로 창업에 접근하였던 것으로 조사되었다. 본 연구결과는 청년창업가들의 창업기회 유형을 이해하여 청년창업가로 하여금 안정적이고 성공적인 창업에 이룰 수 있도록 정책적 지원 방안을 제시한다는 점에서 그 시 사점이 있다.

• BMB Reports
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• 제37권1호
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• pp.28-34
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• 2004

The discovery of biochemical and cellular functions of unannotated gene products begins with a database search of proteins with structure/sequence homologues based on known genes. Very recently, a number of frontier groups in structural biology proposed a new paradigm to predict biological functions of an unknown protein on the basis of its three-dimensional structure on a genomic scale. Structural proteomics (genomics), a research area for structure-based functional discovery, aims to complete the protein-folding universe of all gene products in a cell. It would lead us to a complete understanding of a living organism from protein structure. Two major complementary experimental techniques, X-ray crystallography and NMR spectroscopy, combined with recently developed high throughput methods have played a central role in structural proteomics research; however, an integration of these methodologies together with comparative modeling and electron microscopy would speed up the goal for completing a full dictionary of protein folding space in the near future.

• 한국정보시스템학회지:정보시스템연구
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• 제13권2호
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• pp.155-172
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• 2004

The purpose of this study is to investigate factors which can lead small buyers to participate in a Reverse Aggregation Electronic Market (RAEM). Five factors including search, selection, price, delivery, and Internet literacy were selected as possible factors which are expected to influence small buyers' participation in a RAEM. This paper focused on a RAEM of the Korean automotive industry in which the third party aggregator formed a group of small automobile repair shops (ARS) and amassed buying power for them by building a buyer' oriented electronic market (EM). Survey data were collected from small ARS in South Korea. The results of the empirical analysis indicated that fast delivery and support for Internet illiteracy are potential incentives that could influence buyers' decisions to join a RAEM.

• 농업과학연구
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• 제38권4호
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• pp.723-730
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• 2011

To search for the new development of industrial application of woody plants, the chemical composition of the volatile constituents from woody plants (Evodia daniellii, Clerodendron trichotomum, Prunus padus, and Zanthoxylum ailanthoides) was determined by GC and GC/MS spectrometric analysis with the aid of NBS, Wiley Library and RI indice searches. The major constituents were t-ocimene from the leaves of E. daniellii, linalool from the leaves of C. trichotomum, benzaldehyde from the leaves and twigs of P. padus, ${\beta}$-thujene from the leaves of Z. ailanthoides, and 2-undecanone from the stems of Z. ailanthoides. These results suggested that the major volatile constituents of woody plants could be a useful lead compound in the development of functional materials for industrial application.

• Molecular & Cellular Toxicology
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• 제3권3호
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• pp.208-213
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• 2007

With the help of a development and popularization of microarray technology that enable to us to simultaneously investigate the expression pattern of thousands of genes, the toxicogenomics experimenters can interpret the genome-scale interaction between genes exposed in toxicant or toxicant-related environment. The ultimate and primary goal of toxicogenomics identifies functional context among the group of genes that are differentially or similarly coexpressed under the specific toxic substance. On the other side, public reference databases with transcriptom, proteom, and biological pathway information are needed for the analysis of these complex omics data. However, due to the heterogeneous and independent nature of these databases, it is hard to individually analyze a large omics annotations and their pathway information. Fortunately, several web sites of the public database provide information linked to other. Nevertheless it involves not only approriate information but also unnecessary information to users. Therefore, the systematically integrated database that is suitable to a demand of experimenters is needed. For these reasons, we propose SOP (Search of Omics Pathway) database system which is constructed as the integrated biological database converting heterogeneous feature of public databases into combined feature. In addition, SOP offers user-friendly web interfaces which enable users to submit gene queries for biological interpretation of gene lists derived from omics experiments. Outputs of SOP web interface are supported as the omics annotation table and the visualized pathway maps of KEGG PATHWAY database. We believe that SOP will appear as a helpful tool to perform biological interpretation of genes or proteins traced to omics experiments, lead to new discoveries from their pathway analysis, and design new hypothesis for a next toxicogenomics experiments.

• The Plant Pathology Journal
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• 제38권6호
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• pp.685-691
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• 2022

Plants produce chemicals of immense diversity that provide great opportunities for development of new antifungal compounds. In search for environment-friendly alternatives to the fungicide of current use, we screened plant extracts obtained from more than eight hundred plant materials collected in Korea for their antifungal activity against the model plant pathogenic fungus, Magnaporthe oryzae. This initial screening identified antifungal activities from the eleven plant extract samples, among which nine showed reproducibility in the follow-up screening. These nine samples were able to suppress not only M. oryzae but also other fungal pathogens. Interestingly, the plant extracts obtained from Actinostemma lobatum comprised five out of eight samples, and were the most effective in their antifungal activity. We found that butanol fraction of the A. lobatum extract is the most potent. Identification and characterization of antifungal substances in the A. lobatum extracts would provide the promising lead compounds for new fungicide.

• 산업융합연구
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• 제20권6호
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• pp.117-123
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• 2022

4차 산업혁명시대를 사는 현대인에게 경쟁력과 직결되는 외모는 필수적 자기관리 중 하나로 정착한 가운데 탈모는 헤어스타일 연출의 위해요소로 작용한다. 이렇게 고통 받는 고객을 위한 보다 실용적이고 편리한 가발 제작을 목적으로 정보검색 포털사이트를 통해 연구 대상의 자료를 수집했으며 키워트와 키프리스를 통해 특허출원 동향을 검색하여 가발기술의 시대별 특허동향과 국내 굴지 가발업체의 신소재 개발 동향에 대해 분석하였다. 연구결과 2005년 이전은 가발의 부착과 결속기술, 2006년에서 2013년경은 가발의 인조 모발 관련 제조기술, 2014년 이후는 기능성 관련 가발 기술이 다수 출원된 것으로 나타났다. 그리고 H사와 M사 모두 각자의 특성을 지닌 형상기억 소재와 나노스킨의 신소재 개발 동향을 나타냈다. 본 연구는 가발 산업시장에서 고객에게 편안하고 간편한 착용감을 제공하면서 고객만족까지 도출할 수 있는 기능성 가발 개발의 기초자료로 제공되리라 사료한다.