• 복식문화연구
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• 제14권6호
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• pp.887-899
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• 2006

In this study the preference degree of a Dangcho pattern with priority given to demographic variables was examined. The results was that demographic variables have influence on the preference degree of a Dangcho pattern. The continual arrangement pattern of a stylistic type was shown as the pattern that men in their 40s and over most prefer. The continual arrangement pattern of a realistic type was shown as the pattern that men in their 40s and over and women in their 50s and over most prefer. The continual arrangement pattern of a geometrical type was shown as the pattern that men working on a sales, service, production position and women in their 50s most prefer. The single arrangement pattern of a stylistic type was shown as the pattern that college men in their 20s, men in their 50s and women working on a sales, production, service position most prefer. The single arrangement pattern of a stylistic type of a realistic type was shown as the pattern that men in their 40s working on a sales, service, production position and college women in their 20s most prefer. The single arrangement pattern of a geometrical type was shown as the pattern that most of people prefer.

• 한국지반환경공학회 논문집
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• 제9권5호
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• pp.61-69
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• 2008

일반적으로 암반사면의 안정성을 평가하는 방법으로는 평사투영해석, 한계평형해석, 수치해석, 안정성 평가표에 의한 방법 등 여러 가지 방법이 이용되고 있다. 이 중 안정성 평가표에 의한 방법은 평가법의 제안기관이나 자국의 특성에 따라 그 평가항목이 상이하며, 또한 안정성 평가표상의 개개의 평가항목에 대한 연구는 미흡한 실정이다. 본 연구에서는 315개소의 고속도로 암반사면 분석자료를 이용하여 일반적으로 사용되고 있는 암반사면의 안정성 평가항목중 기하학적 형상(사면높이, 사면경사 및 경사방향, 주불연속면의 경사 및 경사방향, 사면과 주불연속면의 방향차이) 및 지형학적 특성(지형의 집수가능성, 상부자연사면 경사, 사면형상)에 대한 이상치(abnormal value) 분석을 통하여 암반사면 안정성 평가항목의 유효성을 평가하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권11호
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• pp.2893-2912
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• 2013

The design of geometrically invariant watermarking is one of the most challenging work in digital image watermarking research area. To achieve the robustness to geometrical attacks, the inherent characteristic of an image is usually used. In this paper, a geometrically invariant image watermarking scheme using connected objects and gravity center is proposed. First, the gray-scale image is converted into the binary one, and the connected objects according to the connectedness of binary image are obtained, then the coordinates of these connected objects are mapped to the gray-scale image, and the gravity centers of those bigger objects are chosen as the feature points for watermark embedding. After that, the line between each gravity center and the center of the whole image is rotated an angle to form a sector, and finally the same version of watermark is embedded into these sectors. Because the image connectedness is topologically invariant to geometrical attacks such as scaling and rotation, and the gravity center of the connected object as feature points is very stable, the watermark synchronization is realized successfully under the geometrical distortion. The proposed scheme can extract the watermark information without using the original image or template. The simulation results show the proposed scheme has a good invisibility for watermarking application, and stronger robustness than previous feature-based watermarking schemes against geometrical attacks such as rotation, scaling and cropping, and can also resist common image processing operations including JPEG compression, adding noise, median filtering, and histogram equalization, etc.

• 복식문화연구
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• 제10권6호
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• pp.763-780
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• 2002

The aim of this research is to analyze Vionnet´s geometric features, which can be regarded as the key formative beauty among the external characteristics of her works. and to thereby establish the theory that her works emitted a time-transcending life force because they were patterns designed based on a geometrical frame of mind. To prove such argument, studies to understand the basic geometrical aspects appearing in her works will be made by taking a look at the general features of geometry, viewing Vionnet´s philosophy for designing, and examining the geometric cutting methods. The period covered in this paper will center mainly on dresses Vionnet made from her very active days in the fashion sector, 1919. till when she retired from the fashion industry, around 1939. What's outstanding about Vionnet´s geometric principle expressed in her works is the unique cutting method that acknowledges the silhouette of the human body as a cubic or three-dimensions concept, through insight of the human body, the mechanics of the materials, and geometry. Vionnet introduced a simple and elegant design by combining geometric figure cuts, such as rectan히es. quadrants, and triangles. Moreover, she created a new sewing structure that plans everything about the materials to the tiniest detail, resulting in producing a softer style With this, Vionnet showed the geometrical correlation can bring about harmony and the beauty of ideal proportion, forming the source of eternal beauty. As discussed so fu, the geometrical characteristics appearing in Vionnet´s works are marked such as spirals, zig-zag lines, asymmetries. panels, gradation, golden proportion, and the mobius-band.

• 한국유체기계학회 논문집
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• 제18권1호
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• pp.20-28
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• 2015

The pump-turbine impeller is the key component of pumped storage power plant. Current design methods of pump-turbine impeller are private and protected from public viewing. Generally, the design proceeds in two steps: the initial hydraulic design and optimization design to achieve a balanced performance between pump mode and turbine mode. In this study, the 3D inverse design method is used for the initial hydraulic impeller design. However, due to the special demand of high performance in both pump and reverse mode, the design method is insufficient. This study is carried out by modifying the geometrical parameters of the blade which have great influence and need special consideration in obtaining the high performance on the both modes, such as blade shape type at low pressure side (inlet of pump mode, outlet of turbine mode) and the blade lean at blade high pressure side (outlet of pump mode, inlet of turbine mode). The influence of the geometrical parameters on the performance characteristic is evaluated by CFD analysis which presents the efficiency and internal flow results. After these investigations of the geometrical parameters, the criteria of designing pump-turbine impeller blade low and high sides shape is achieved.

• 한국음향학회지
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• 제25권5호
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• pp.197-206
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• 2006

비올족 현악기에서 현의 진동은 브릿지에 의해 전판에 전달되어서 악기 몸통을 공명시킨다. 따라서 브릿지의 재질, 기하학적 형상, 설치 위치 등이 음색에 영향을 미치게 된다. 본 연구에서는 첼로에서 현에 의해 변위가 가해질 때 브릿지 내부의 변형, 응력, 그리고 브릿지 다리에 의해 전판에 미치는 힘을 탄성학적으로 해석하고, 브릿지의 고유진동모드와 고유진동주파수 등을 구하였다. 또, 브릿지의 형상이 음색에 미치는 영향을 주파수 응답의 관점에서 측정하였다. 본 연구의 결과는 첼로에서 브릿지의 진동특성은 대단히 복잡하고, 그 재질, 형상 등이 음색에 큰 영향을 미치며, 따라서 브릿지의 형상을 변화시킴으로써 첼로의 음색을 조정하는 것이 가능함을 실험적으로 보였다.

• 한국정밀공학회지
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• 제21권2호
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• pp.21-26
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• 2004

The formed tool is used to machine the geometrical shape of bearing rubber seal efficiently. The bearing rubber seal has complex geometry for the complicated geometrical shape to prevent leakage of lubricant oil and influx of the dust effectively. Because it is difficult to machine the unique shape exactly by the conventional tool, the formed tool is used in machining a rubber seal die. In this paper, It is performed to investigate machining characteristic of the formed tool； cutting edge wear, cutting force, and surface quality. Also, an efficient precision machining condition is proposed, and the inspection results of rubber seal with CAI are discussed.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -2
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• pp.1252-1255
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• 2002

In this paper, face recognition algorithm, by using skin color information of HSI color coordinate collected from face images, elliptical mask, fratures of face including eyes, nose and mouth, and geometrical feature vectors of face and facial angles, is proposed. The proposed algorithm improved face region extraction efficacy by using HSI information relatively similar to human's visual system along with color tone information about skin colors of face, elliptical mask and intensity information. Moreover, it improved face recognition efficacy with using feature information of eyes, nose and mouth, and Θ1(ACRED), Θ2(AMRED) and Θ 3(ANRED), which are geometrical face angles of face. In the proposed algorithm, it enables exact face reading by using color tone information, elliptical mask, brightness information and structural characteristic angle together, not like using only brightness information in existing algorithm. Moreover, it uses structural related value of characteristics and certain vectors together for the recognition method.

• 오토저널
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• 제9권4호
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• pp.35-40
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• 1987

The experimental study, using constant pressure injection system, is carried out to investigate the effect of the geometrical shape changes of the needle valve of the effective flow area, the spray angle and the Sauter's Mean Diameter according to needle valve lift for a pintle-type injection nozzle. The results are as follows: 1) With the increase of the needle valve lift, the effective flow area is increased, the spray angle is at first increased and later decreased, and the Sauter's Mean Diameter is decreased. 2) It is also shown that the spray angle is maximum at the rapidly increased region of the effective flow area.

• 한국주거학회논문집
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• 제15권2호
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• pp.63-73
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• 2004

Louis I. Kahn's spacial composition is characterized by traditional motives and Ecole des Beaux which had influenced him. This influence had showed five forms about Kahn's spacial composition. His constituent factors in geometrical form are classified into the propositional system, the cellular multiplication of a special unit, the Poche Space and others. According to the results of this study obtained from above mentioned subjects, it can be concluded that geometrical factors, which constitute space of plan, are totally expressed as a system of order which unites particular ones into whole one. This characteristic had developed into a completed meaning for passing through the residential architecture in 1950's, and showed in the other artworks there after.