• 복식문화연구
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• 제16권2호
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• pp.278-292
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• 2008

The purpose of this study is to propose apparel sizing system for each body shape of early adolescent boys. The subjects of this study were 549 boys in the capital area. Their body shapes were classified based on 47 anthropometric measurements, 43 photographic measurements and 10 indexed measurements. The apparel sizing system was proposed for each body shape. For data analysis were performed descriptive statistics, correlation analysis and crosstabulation using SPSS Ver. 12. The control dimensions to propose apparel sizing system were stature and waist circumference for the lower garments. Intervals between sizes were 5cm for stature and irregular for waist circumference. For each type, $5{\sim}8$ sizes were proposed for lower garments. Reference measurements suggested fur lower garments were 7 items. This study is meaningful in that it proposed apparel sizing system for each type of body shape. The results of this study are expected to contribute to planning sizes according to the type of body shape and improving the fitness of ready-made clothes in apparel and school uniform manufacturers.

• 한국구조물진단유지관리공학회 논문집
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• 제9권2호
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• pp.137-146
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• 2005

본 연구는 형상반복법과 수정 라그랑쥐 방법으로 사장교 케이블의 초기장력과 기준길이를 계산하였다. 사장교의 거더와 주탑은 3차원 frame 요소로, 케이블은 비선형 트러스요소와 Ernst의 케이블 요소로 이상화하였다. 본 연구의 유한요소법에 의한 케이블의 초기장력과 실무에서 사용하는 시산법에 의한 케이블의 장력을 비교한 결과, 전자의 경우가 후자의 경우보다 적음을 알 수 있었다. 케이블의 기준길이는 비선형 트러스요소를 사용한 해석결과와 Ernst의 케이블 요소를 사용한 해석결과를 비교하였으며 두 가지 해석결과가 거의 일치함을 알 수 있었다. 또한 기준길이는 초기장력값을 나타내는 단순교의 지간과 거의 일치함을 알 수 있었다. 따라서 케이블의 기준 길이는 본 연구로부터 얻은 초기장력을 가진 단순보의 호의 길이를 나타냄을 알 수 있었다.

• Journal of Electrical Engineering and information Science
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• 제3권2호
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• pp.230-238
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• 1998

When size and shape of moving object have been changed, a correlator often accumulates walk-off error. A success of correlation-based tracking largely depends on choosing suitable window size and position and thus transferring the proper reference image to the next frame. For this, we propose the Adaptive Window Algorithm with Four-Direction Sizing Factors (AWA-FSF) for fast adjusting a reference region to enhance reliability of correlation-based image tracking in complex cluttered environments. Since the AWA-FSF is capable of adjusting a reference image size more rapidly and properly, we can minimize the influence of complex background and clutter. In addition, we can finely tune the center point of the reference image repeatedly after main tracking process. Thus we have increased stability and reliability of correlation-based image tracking. We tested performance of the AWA-FSF using 45 real image sequences made of over 3400 images and had the satisfied results for most of them.

• 한국정밀공학회지
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• 제13권6호
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• pp.78-89
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• 1996

Every mechanical component is fabricated with the variations in its size and shape, and the allowable range of the variation is specified by the tolerance in the design stage. Geometric tolerances specify the size or the thickness of each shape entity itself or its relative position and orientation with respect to datums. Since the range of shape variation can be represented by the variation of the coordinate system attached to the shape, the transformation matrix of the coordinate system would mathematically express the range of shape variation if the interval numbers are inserted for the elements of the transformation matrix. For the shape entity specified by the geometric tolerance with reference to datums, its range of variation can be also derived by propagating the transformation matrices composed of interval numbers. The propagation depends upon the order of precedence of datums.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1268-1271
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• 2005

This paper proposes a compact-sized surface myoelectric sensor for myoelectric hand prosthesis. To fit the surface myoelectric sensor in the socket of the myoelectric hand prosthesis, the sensor should be a compact size. The surface myoelectric sensor is composed of a skin interface and a single processing circuit that are mounted on a single package. Since the skin interface has one reference and two input electrodes, and the reference electrode is located in middle of two input electrodes, we propose two types of sensors with the circle- and bar-shaped reference electrode, but all input electrodes are the bar-shaped. The metal material used for the electrodes is the stainless steel (SUS440) that endures sweat and wet conditions. Considering conduction velocity and median frequency of the myoelectric signal, we select the inter-electrode distance (IED) between two input electrodes as 18mm, 20mm, and 22 mm. The signal processing circuit consists of a differential amplifier with band pass filter, a band rejection filter for rejecting 60Hz power-line noise, amplifiers, and a mean absolute value circuit. We evaluate the proposed sensor from the output characteristics according to the IED and the shape of the reference electrode. From the experimental results we show the surface myoelectric sensor with the 18mm IED and the bar-shaped reference electrode is suitable for the myoelectric hand prosthesis.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.527-530
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• 2016

본 논문에서는 $0.35-{\mu}m$ standard CMOS 공정에서 낮은 전력을 소모하면서 낮은 전원전압에서 동작하는 곡률보상 기능을 갖는 기준전류/전압 발생 회로를 제안한다. 제안된 회로는 weak-inversion 영역에서 동작하는 MOS 트랜지스터들을 사용함으로써 1V 이하 전원전압에서 동작할 수 있다. 시뮬레이션 결과는 제안되는 곡률보상 기술을 사용하여 기존의 곡률보상 기능이 없는 BGR 회로들처럼 종 모양이 아닌 사인 곡선과 같은 모양을 나타내 작은 TC 값을 보여준다. 제안된 회로들은 모두 0.9V의 전원전압에서 동작한다. 먼저, 기준전압 발생 회로는 176nW 전력을 소모하며, 온도 계수는 $26.4ppm/^{\circ}C$이다. 기준전류 발생 회로는 194.3nW 전력을 소모하며, 온도 계수는 $13.3ppm/^{\circ}C$이다.

• 제어로봇시스템학회논문지
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• 제17권11호
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• pp.1159-1167
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• 2011

A novel 3D tube scanning technique is proposed. The proposed tube scanning technique is developed for a special tube inspection module which consists of four line-lasers and one camera. Using the scanning module, we can reconstruct the 360 degree shapes of the inner surfaces of a cylindrical tube. From an image frame captured by the camera, we reconstruct a partial tube model based on four laser triangulations. Then by aligning such partial models with respect to a reference tube axis, a complete 3D shape of the tube is reconstructed. The tube axis in each reconstructed frame is aligned with a 3D Euclidean transformation to the reference axis. Several experiments show that the proposed method can align multiple tube axes very accurately and reconstruct 3D shapes of a tube with very low shape distortion.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.1047-1050
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• 1997

Rapid Prototyping(RP) is an efficient method for rapid design verification and trial manufacturing. In order to improve their unique characteristics according to the working principles. Variable Lamination Manufacturing process and corresponding CAD/CAM system is developed. The objective of this study is to improve dimensional accuracy of VLM-ST process, and it can be done by offset for cutting error correction, cutting path correction for sharp edge and reference shape generation. To verify the proposed algorithms, they applied to three-dimensional shapes, such as spanner and mechanical part.

• 제어로봇시스템학회논문지
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• 제6권1호
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• pp.91-97
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• 2000

In this paper, the illuminator is designed to recognize the shape and the existence of holes of radiation fin in the point that the light reflection characteristics are different according to the roughness of the material. The threshold value, the positions of holes and the black pixel nembers in the positon are obtained under the illuminator, in accordance with the reference image, by applying binary conversion and hole segmentation algorithm, as they are suggested in this paper, The existence and shape of hole are recognized by calculating the distance and feature value in the test image, which is obtained from the parameters of reference image. It is programmed to apply to GUI(Graphic User the Interface) in windows. More than 98% of recognition rate is shown, as it is applied to three different sizes of the radiation fin.

• 한국유체기계학회 논문집
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• 제10권4호
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• pp.29-38
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• 2007

In this study, flow structure in a two-stage centrifugal compressor for a turbo-chiller with the refrigerant, R134a, was numerically investigated at the design point of the compressor using a commercial code. Flow characteristics in the passages of impeller, diffuser and return channel were analyzed in detail including velocity vector, secondary flow, Mach number and pressure contours in blade spanwise and meridional plane for each stage. The estimation on the one-dimensional output from the preliminary design and three-dimensional shape of the impeller blade and the meridional shape of the return channel were performed through the flow analysis, while some numerical schemes and techniques including Multiple Frames of Reference technique, real gas property data and inlet boundary condition changes, which were used in CFD, were compared with their features. The results will be used as reference data for a new design of 3-D impeller shape to improve R134a compressor performance.