• 한국산학기술학회논문지
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• 제19권4호
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• pp.525-531
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• 2018

본 연구는 우리나라 대표적인 전통 천연염색 기술인 풋감 염색의 단점인 뻣뻣한 촉감을 개선하고 천연자원을 효율적으로 활용하기 위하여 갈조류 감태와의 이성분 복합염료를 제조하여 염색성을 타진하고자 하였다. 풋감과 감태로 각 단일염료를 제조하고 단일염료 간의 혼합 비율을 달리한 동시 일욕염색을 실시한 결과, 전통 풋감 염색직물과의 색채의 차이가 허용 가능하고 염색 직물의 강연성이 가장 낮아져서 촉감의 개선이 기대되는 최적의 감태 혼합비율은 6%로 판단하였다. 이 혼합 비율로 풋감과 감태의 단일 염료를 혼합하여 열수추출과 필터링을 거쳐 동결건조시킨 이성분 복합염료를 제조하여, 염료의 입자 크기가 각 단일염료보다 미세하며, 풋감의 기능성 성분인 카테킨 함량이 유지됨을 확인하였다. 또한 이성분 복합염료로 염색한 면직물은 일욕염색 직물보다 전통 풋감 단일염색 직물과의 색차가 더 적어서 전통 풋감 염색과 시각적으로 차이가 없었으며, 강연성이 더 낮아져서 뻣뻣한 촉감이 완화되는 것으로 사료되었다. 따라서 풋감/감태의 이성분 복합염료는 풋감을 이용한 전통 천연염색 제품의 촉감을 개선할 뿐 아니라, 천연자원을 효율적으로 활용하는 데에 도움이 될 것으로 기대된다.

• 환경정책연구
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• 제3권2호
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• pp.89-112
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• 2004

This Study aims to demonstrate how much flood vulnerability in urban area changed for the past 32 years by using the panel model. At the same time, this study strives to determine the primary factors and to construct an effective counter-plan by means of empirical research. After selecting research hypotheses based on considerations of issues concerning causes for urban flooding, their relevance is put to the test by conducting empirical research in individual case locations. This research verifies the four research hypotheses by using one-way error component regression model. In conclusion, this research has shown that urban land use and local characteristics act as significant flood determinants, with forests acting to reduce flood dangers. Moreover, constructing embankments can no longer represent a reliable flood control policy. The changes in future flood control policies need to incorporate local characteristics and to minimize natural destruction, so that humans and nature can coexist through environmentally friendly flood management policies.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.272-279
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• 2002

A common task in assembly modeling is the determination of the position and orientation of a set of components by solving the spatial relationships between them. Assembly models could be constructed at various levels of abstraction. They could be classified into component or geometry-level assembly models. The geometry-level assembly design approach using mating constraints such as against and fits is widely used in the commercial modelers, but it may be very tedious in some cases fur designer. In this paper, we propose a new method to construct an assembly model at the component-level by extracting joint mating features from the kinematics constraints specified between components. The assembly model constructed using the proposed method includes hierarchical and relational assembly models, component/sub-assembly positions and degrees of freedom information. The proposed method is more intuitive and natural way of assembly design and it guarantees the topological robustness of assembly modification such as component replacement and modification.

• 스마트미디어저널
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• 제1권4호
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• pp.27-34
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• 2012

In this paper, a novel text binarization is presented that can deal with some complex conditions, such as shadows, non-uniform illumination due to highlight or object projection, and messy backgrounds. To locate the target text region, a focus line is assumed to pass through a text region. Next, connected component analysis and stroke width estimation based on location information of the focus line is used to locate the bounding box of the text region, and each box of connected components. A series of classifications are applied to identify whether each CC(Connected component) is text or non-text. Also, a modified K-means clustering method based on an HCL color space is applied to reduce the color dimension. A text binarization procedure based on location of text component and seed color pixel is then used to generate the final result.

• 소음진동
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• 제9권2호
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• pp.401-408
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• 1999

A method is presented for the vibration analysis of steam turbine-generator rotor system based on the component mode synthesis method. The motion of each component of the system is described by superposing constraint mode associated with boundary coordinates and constrained normal modes associated with internal coordinates. This method using real fixed-interface modes allows for significant reduction in system model size while retaining the essential dynamic characteristics of the lower modes. The capability of this method is demonstrated in the natural frequency and unbalance response analysis of the steam turbine-generator rotor system in which the dynamics of the pedestal is considered. The results by the present method are compared with finite element method and trnasfer matrix method in terms of the accuracy and computing time.

• 한국산학기술학회논문지
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• 제13권11호
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• pp.5534-5541
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• 2012

본 연구의 목적은 자연재해 취약성에 근거하여 수도권 도시를 유형화하고, 유형별 특성에 따른 차별적인 자연재해 저감방안을 제시하는데 있다. 본 연구의 실증분석은 자연재해 취약성 요인의 추출, 요인득점을 이용한 수도권 도시의 유형분류, 유형화 결과에 기초한 차별적인 자연재해 저감방안 제시라는 세 단계로 구성되었다. 보다 구체적으로 주성분분석의 결과 고유치가 1 이상인 유의미한 요인은 3개로 추출되었고, 이들은 각각 자연재해에 대한 지형적 내재해성, 비도시성, 재해예방능력을 나타내는 요인으로 특징지을 수 있었다. 지역별 요인득점을 이용한 k-medians 비계층적 군집분석의 결과 사례지역은 지형적으로 자연재해에 취약하고 재해예방능력이 미흡한 지역, 시가화지역으로서 재해예방능력이 양호한 지역, 비도시지역으로서 지형적으로 자연재해에 취약한 지역, 자연재해에 대한 지형적 내재해성을 갖고 있으나 재해예방능력이 미흡한 지역이라는 4개의 군집유형으로 분류되었다. 끝으로 수도권 내 유형별 특성을 고려한 차별적인 자연재해 저감방안이 제시되었다.

• 한국염색가공학회지
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• 제15권6호
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• pp.47-54
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• 2003

To be dyed with cationic Berberine, the cotton fiber was modified with reactive anionic agent. The Berberine, a natural cationic colorant of pure yellow, is the major component of Amur Cork tree extract and also can be employed as a natural antimicrobial agent due to its characteristic of cationic quaternary ammonium salt. By LC/MS analysis, it became obvious that the Berberine was contained in Amur Cork tree extract as a major color component. The adsorption of the Berberine on the cotton fabrics pretreated with the anionic agent was greatly increased comparing to that of untreated fabric. Because the anionic agent was colorless, it did not cause unintended color change of the dyeings. The dyed fabric with the Berberine has strong antimicrobial activity showing 99.5% of reduction of bacteria against Staphylococcu aureus.

• 한국정밀공학회지
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• 제31권8호
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• pp.697-703
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• 2014

This paper is study of solving vibration problem occurred in moving hand of wafer transfer robot in semiconductor manufacturing line. Long settling time for decreasing vibration makes low production rate, and moreover the excessive vibration of hand sometimes breaks the wafer in a cassette. The ways of reducing the moving speed and changing the type of motion profile did not help for lessening vibration. Therefore, we analyzed the mechanical property of the hand such as natural frequency, and frequency component of the motion profile currently used in the manufacturing line. In several conditions of motion profile, we found the best condition of which the frequency component in near of natural frequency of the hand is minimal and this induced small vibration in moving hand. The results were verified theoretically and experimentally using frequency analysis.

• BMB Reports
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• 제28권3호
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• pp.275-280
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• 1995

The respiratory burst oxidase of neutrophils is a multicomponent enzyme, domant in resting cells, that catalyzes the reduction of oxygen to $O_{2}^{-}$ at the expense of NADPH. In the resting neutrophil, some of the components of the oxidase, including proteins p47 and p67, are in the cytosol, while the rest are in the plasma membrane. Recent evidence has suggested that at least some of the cytosolic oxidase components exist as a complex. The cytosolic complex with a molecular weight of ~240 kDa was found to bind to blue-agarose and 2',5'-ADP-agarose, which recognize nucleotide requiring enzymes. In order to identify the nucleotide binding component of the cytosolic complex we purified recombinant p47 and p67 fusion proteins using the pGEX system. Pure recombinant p47 was retained completely on 2',5'-ADP-agarose, whereas pure recombinant p67 did not bind to these affinity beads. On the basis of these results, we infer that p47 may contain the nucleotide binding site.

• 소음진동
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• 제7권5호
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• pp.737-746
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• 1997

The substructure synthesis method is used for making it easy to analyze vibration systems generally in vibration field. In the past, this method has been to be used mainly because of shortage of computer memory and CPU time. But recently this method is used for analyzing complex structure or identifying the characteristics of systems precisely. The purpose of this study is to develop acoustic substructure synthesis method that can be applied to acoustic modal analysis of complex acoustic systems. Acoustic modal analysis method to be introduced here is a method that analyze acoustic natural mode shape of the complex acoustic system by the principle of CMS(component mode synthesis method). This paper describes the acoustic modal analysis of the acoustic finite element model of simple expansion pipe by acoustic substructure synthesis method. The resutls of acoustic modal analysis analyzed by Acoustic substructure synthesis method and the results by FEM(finite element method) shows good agreement.