• 한국멀티미디어학회논문지
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• 제13권6호
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• pp.817-824
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• 2010

Linear Discriminant Analysis (LDA) has been successfully applied for dimension reduction in face recognition. However, LDA requires the transformation of a face image to a one-dimensional vector and this process can cause the correlation information among neighboring pixels to be disregarded. On the other hand, 2D-LDA uses 2D images directly without a transformation process and it has been shown to be superior to the traditional LDA. Nevertheless, there are some problems in 2D-LDA. First, it is difficult to determine the optimal number of feature vectors in a reduced dimensional space. Second, the size of rectangular windows used in 2D-LDA makes strong impacts on classification accuracies but there is no reliable way to determine an optimal window size. In this paper, we propose a new algorithm to overcome those problems in 2D-LDA. We adopt an ensemble approach which combines several classifiers obtained by utilizing various window sizes. And a practical method to determine the number of feature vectors is also presented. Experimental results demonstrate that the proposed method can overcome the difficulties with choosing an optimal window size and the number of feature vectors.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 추계학술발표대회 논문집
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• pp.232-235
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• 2004

This is the preliminary study to develop composite window frame of commercial aircraft using VaRTM process. For two candidate carbon fabric(triaxial fabric, sleeving braider dry carbon fiber), specimens were fabricated using VaRTM process ,and then the physical & mechanical tests were performed to gain material property according to ASTM. FEM analysis for each candidate carbon fabric were performed to find the minimum ply number and weight for composite window frame. In this study Tsai-Wu strength failure criteria was utilized to evaluate the safety of structure.

• 한국정밀공학회지
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• 제22권7호
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• pp.177-184
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• 2005

Recently, the engineering designer of injection mould has become more and more dependent on the CAE. In the design factors of injection mould, the shrinkage rate should be considered as one of the important performances to produce the reliable products. therefore the shrinkage rate can be mostly calculated by the MoldFlow and Pro-engineering. in the design process. However it is not easy to predict the shrinkage rate of a plastic injection mold in its design process because the analysis can take minutes to hours, the high computational costs of performing the analysis limit their use in design optimization. In this study, the surrogate models, DACE model, based on the Kriging in order to optimize the shrinkage rate of electric microwave oven window is used in lieu of the original models, facilitating design optimization.

• 한국기계가공학회지
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• 제13권4호
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• pp.106-112
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• 2014

This study presents the mechanical behavior of a ventilating window (a tsunami damper) on the building wall of a nuclear power plant. The window, which is under development, is used to ventilate a machinery room and the building under normal conditions, but it also provides a safety barrier for critical equipment against a tsunami caused by an earthquake. A finite element analysis was conducted to investigate the deflection and the stress distribution of the window under given loading conditions. With symmetry, a one-quarter portion of one window was modeled, and the pressure due to a great tide is assumed to be 7 bar. A structural analysis of the assembled frame, composed of a blade and casing, was also conducted using contact conditions to find the stress and strain configurations caused by the applied pressure.

• 대한전자공학회논문지SD
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• 제39권1호
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• pp.31-38
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• 2002

0.35㎛-비아(via) 식각공정을 개선하기 위하여 C₂F/sub 6/가스의 식각특성을 분석하였다. 실험한 재료는 TEOS/SOG/TEOS 막을 올린 8인치 웨이퍼이며, 실험의 기법은 직교행열(Orthogonal array matrix) 실험 방식을 활용하였다. 산화막 식각에 이용된 장비는 transformer coupled plasma(TCP) source 방식이며 고밀도 플라즈마(HDP)장비이다. 실험의 결과는, 실험변수의 범위 내에서 C₂F/sub 6/는 0.8㎛/min-1.l㎛/min 범위의 식각속도를 보이며 균일도(Uniformity)는 ±6.9%미만으로 측정되었다. CD 변화(skew)는 식각 전과 후를 비교하여 10% 미만이었고 그 결과 비등방성(anisotropic) 식각의 특성이 우수하였다. C₂F/sub 6/를.20sccm 공급할 때 문제점이 발견되지 않았지만 14sccm을 공급하면 SOG 막의 내벽이 침식당하는 문제점이 있었다. 결과적으로 C₂F/sub 6/는 HDP TCP에서 빠른 식각비와 넓은 공정창(process window)을 가진 식각특성을 나타내었다.

• 한국실내디자인학회논문집
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• 제40호
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• pp.86-93
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• 2003

Korean traditionally prefer a house with a southern exposure to other styles. Moreover, pretty part of dwelling style in Korea is apartment building. But generally, there are much more north oriented rooms than opposite one in apartment. Generally, most Korean tends to consider the direction of the room as an important factor to decide the arrangement of their furniture. Also, the location of window, door, bed, and closet can affect on the decision-making process of furniture layout. So, the closet position should be determined by not only window direction and door position, but also the furniture arrangement preference of residents. After considering the window and door position, there are 16 alternatives in a room. (Multiplied 4 window directions by 4 door positions under the assumption that the window and the door cannot be on the same side of the wall.) Also, this study analyzed each room style ratio considering the symmetry of each plan by comparing the apartment building plan. This paper studied the bedroom style by analyzing the 180 apartment building plans and survey of furniture layout; the furniture in this study represents bed and desk those are mainly laid in Korean bedroom. Finally, this paper suggested the methodology to find optimal alternatives of furniture and closet layout for high-rise apartment residents, based on the door and window position, and the furniture layout preference of residents.

• 대한조선학회논문집
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• 제51권4호
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• pp.291-299
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• 2014

In the design process of ship or its comprising components, the key to the successful design is how to guarantee the structural safety satisfying the international standard and regulation, which sometimes is not clear enough to cover the detail designs. This study deals with the design procedure for submersible viewing window installed in catamaran. As the window material, the Plexiglass, a type of reinforced plastic, is considered to satisfy the design requirements of international standard. Window thickness is calculated using geometric nonlinear finite element analysis, in order to take into account possible large deformation due to low stiffness of the Plexiglass, and the results are compared with those determined by the procedure specified in ISO12216. Finally, for the validation of proposed design, the pressure test had been carried out following the procedure specified in the standard, and structural safety was checked.

• 한국태양에너지학회 논문집
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• 제30권5호
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• pp.38-43
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• 2010

Enhancement of exterior's insulation performance like wall or window etc. is general way for building's energy efficient and thermal performance. But exterior's opening plan is important for minimizing the energy consumption and heat loss. In this paper, energy saving rate will be analyzed and compared considering the window area's rate and window's SC(Shading Coefficient) in a apartment with Building Energy Efficiency Rating System's evaluation tool. In the process of evaluation, energy saving rate is measured at each stage of the window area's rate from 20% to 60% every 10% term and the shading coefficient value from 1.0 to 0.6. As a result of this research, energy saving evaluation could not be measured exactly with existing evaluation tool. Accord this research, Building Energy Rating System's evaluation range is needed to be broaden for exact evaluation of energy saving rate.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.291-296
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• 2007

This study presents the evaluation process for door module. Its objective evades the resonance generated at module plate due to the operation of window regulator motor. For this study, the design improvement process is composed of experimental methods having three steps. First step is modal analysis at door assembly status for acquisition of dynamic characteristics which are modal frequency and damping. Second step is a vibration experiment to get the test mode considered an efficiency of window regulator motor. Last step is a vibration measurement by the form of $6{\times}6$ array on module plate. A vibration measurement of 6x6 array form can be got to three analysis results which are a transfer path of vibration using cross correlation function, a vibration map using OA level and a contribution by frequency band using coherent output power spectrum on module plate. These results are applied to SDM(structural dynamic modification) for design improvement to get around the resonance on module plate by the excitation of window regulator motor.

• KIEAE Journal
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• 제13권6호
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• pp.77-82
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• 2013

Light environment in the school building is one of the most important elements of the plan in order to improve student's ability to learn and the healthy growth. Thus, the window plan of the school building is a great addition to improve environmental-friendly performance through the daylight control. Daylight is highly beneficial for improving the indoor environmental quality and reducing building energy consumption, daylighting applications are scarcely considered, especially during the school building design process, because of lack of previous studies on the light environment of student and complex simulation process. Therefore, daylighting process were performed using ECOTECT, which has various advantage such as easy user interface and simple simulation processes. ECOTECT simulation were performed using weather data. As a result, ECOTECT simulation are performed for daylight autonomy and useful daylight illuminance. Using this data, Window planing is to propose and effective method in the early stages of design.