• Journal of Biomedical Engineering Research
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• v.34 no.2
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• pp.55-62
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• 2013

Wrist joints consist of irregularly shaped carpal bones and other complicated structures. Thus, evaluating the motion of a wrist joint is a challenging task. In this study, we used an infrared camera to perform a kinematic analysis of a dart-throwing motion. We measured the difference between the movement of a normal wrist and constrained wrist (wrist with a wrist glove) in the dart-throwing motion with thirty six healthy participants. We measured the ulna flexion - radial extension motion using the attached passive marker and analyzed it using Polygon software and SPSS. The pitch and yaw motions with a glove was bigger than the ones without a glove by 20 and 15 degrees, respectively. On the other hand, the roll motion without a glove was bigger than the one with a glove by 7 degree. Wilcoxon signed rank test (p<0.05) confirmed that there are significant differences between the motion with and without a glove. It was found that the magnitude of the pitch and yaw motion with a constrained wrist joint toward radial extension in dart-throwing motion is smaller than the one with a normal wrist joint. However, a normal wrist joint showed a bigger movement in the roll direction.

• Journal of the Korean Home Economics Association
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• v.43 no.5 s.207
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• pp.117-130
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• 2005

Western clothing is adjusted to the figures of the human body unlike Korean traditional clothes. For this adjustment, we need a method, known as dart, to reasonably adjust a wide circumference to curves of the human body. So far, there has been some research in the aspect of clothing engineering on how to decide darts of skirts or trousers, but no theoretical research has yet been conducted on how to decide the number and amount of dart, which has caused difficulties in beginners' understanding of dart. Futhermore, there is no consistent drawing method for the number and amount of darts in existing teaching and teaming materials. Therefore, to develop teaching and teaming methods for darts, this study identified the amount and number of darts for waist girth of 66-72cm and a hip girth of 86-102cm. When the difference between the waist girth and the hips girth, including margins, is above a minimum of 26cm, two darts can be designed, but when the difference is below 24cm, one dart is necessary. The amount of darts increases by 0.5cm for every 2cm increase of the hip girth to the waist girth. In addition, as darts become longer, the cutting of the waist line becomes smoother. For one, rather than two, darts the curve of the waist line is steeper. Based on the above results, it was assured that when belts are curved through adjustment to the waist line of skirts or slacks, their composition can be stable. Therefore, in basic teaching about slacks and skirts, the number and amount of the darts should be designed according to the difference between the girths of the waist and the hip. This difference should be a minimum of 24cm, but if it is below 24cm, the number of darts needed is one.

• Journal of Biomedical Engineering Research
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• v.32 no.2
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• pp.144-150
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• 2011

The primary purpose of this study was to analyze the motion of the scaphoid, capitate, and lunate during dart-throwing motion by three-dimensional modeling. Five series of CT images of five normal right wrists were acquired from five motion steps from radial extension to ulnar flexion in the dart-throwing motion plane. Segmentation and three-dimensional modeling of bones from CT images was performed using Analyze. Distances among centroids of the scaphoid, capitate and lunate and angles between principal axes of three carpal bones were calculated to analyze the motion by using MATLAB. As the wrist motion changed from radial extension to ulnar flexion, the distance between two adjacent bones decreased. The scaphoid and lunate rotated less than the capitates during dart-throwing motion. This study reports the Three-dimensional in vivo measurement of carpal motion using CT images.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.392-392
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• 2021

자료동화(data assimilation) 기법은 관측 자료와 예측 모형의 정보를 동시에 활용, 모형의 상태량(state variables)이나 매개변수(model parameters)를 실시간으로 업데이트하는 Bayesian 필터링 이론에 근거한 방법으로, 최근 이를 활용한 수문 모의 정확도 향상 기술이 빠르게 발전하고 있다. 본 연구에서는 앙상블 자료동화의 정확성을 향상시키기 위한 세부 방법인 along-the-stream localization과 inflation 기법의 분포형 수문 모형에 대한 적용성을 대규모 지역 단위(regional-scale) 모의를 통해 검토한다. 분포형 수문모형과 자료동화 framework로는 WRF-Hydro(Weather Research and Forecasting Model Hydrological Modeling System)와 DART(Data Assimilation Research Testbed)를 각각 적용한다. WRF-Hydro는 미국의 전 대륙지역(CONUS; continental United States)에 대한 수문 모델링 framework인 National Water Model의 핵심엔진이고, DART는 미국 National Center for Atmospheric Research(NCAR) 연구소에서 개발한 범용 자료동화 도구이다. 본 연구에서는 지표수 수문모형의 자료동화를 위해 개발된 기법인 along-the-stream localization과 inflation 기법이 하도 추적에 미치는 영향을 분석한다. along-the stream localization 기법은 공간적 근접도 외에 하도의 수문학적 연관관계를 고려하는 localization 기법으로, 상대적으로 수문학적 상관도가 떨어지는 하도에 대한 과도한 자료동화를 줄여줄 수 있다. inflation 기법은 앙상블의 다양성을 증가시키는 기법으로, 칼만 필터(Kalman filter)에 의한 업데이트의 이전이나 이후 적용하여 앙상블 예측의 정확도를 추가적으로 향상시킬 수 있다. 본 고에서는 앙상블 자료동화 기법을 지표수 수문 모의에 적용할 경우 남아 있는 난제와 적용 가능한 방법에 대해 중점적으로 논의한다.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.359-362
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• 1999

본 연구에서는 작은 삽입손실을 구현하기 위해 적용되는 SPUDT 중에서 현재 가장 널리 사용되고 좋은 성능을 가지는 DART와 EWC/SPUDT형 SAW 필터에 대해서 그 효용성을 Smith 등가회로 해석법을 이용하여 분석하였다. 그리고 apodization weighting된 SAW 필터에 단순히 SPUOT를 적용하였을 때 발생하는 일부 특성열화를 보상하기 위한 방법으로, 이 두 종류 SPUDT의 폭이 넓은 전극에 대한 weighting을 독립적으로 행하였고 전극두께를 조절하여 성능변화를 보았다. 그 결과로 동일 전극길이를 갖는 경우에는 EWC/SPUDT형 SAW 필터가 DART형 SAW 필터보다 삽입손실이 더 작으나 리플이 크고, apodization weighting된 SAW필터에 SPUDT를 적용한 경우에는 전반적으로 DART형 SAW 필터가 EWC/SPUDT형 SAW 필터보다 우수한 성능을 가지는 것으로 나타났다. 본 연구의 결과는 특정 형태의 SAW 필터에 SPUDT를 적용하는 문제에 있어서 적절한 SPUDT의 타입을 결정하는데 도움을 주리라 기대된다.

• The Research Journal of the Costume Culture
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• v.7 no.6
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• pp.140-158
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• 1999

The purposes of this study are to examine the characters of the lower body shape in the middle aged women and to make slacks pattern on the base of four difference body shapes. The lower body shapes were classified into 4 types on the basis of their lateral view silhouettes. The slacks patterns were based on the lower body shape characters and resulted in followings. In “Type 1” of the right body shape with the standard protrusion of abdomen and hips, little difference from conventional patterns was seen in experiment pattern, in which the front waist girth was W/4+0.5㎝+0.5㎝+fold(2.5㎝) and the back waist girth W/4+0.5㎝-0.5㎝+dart(3.5㎝). The front hip girth was defined as H/4+2.0㎝+0.5㎝ and the back hip girth as H/4+2.0㎝-0.5㎝ due to its increased ease amount produced by abdominal fat deposition. In the experimental pattern of “Type 2” with prominent hips, the front and back differences of the waist girth and the hip girth and the hip girth were defined as 1.0㎝ and 2.0㎝ separately. Accordingly, the front waist girth was W/4+0.5㎝+1.0㎝+fold(2.0㎝), the back waist girth W/4+0.5㎝-0.1㎝+dart(6.5㎝), the front hip girth H/4+2.0㎝+1.0㎝ and the back hip girth H/4+2.0㎝-1.0㎝. In “Type 3” with the prominent abdomen and the flat hips, the front waist girth was set up as W/4+0.5㎝+0.5㎝+fold(4.5㎝) for the increased front fold amount and the back waist girth was W/4+0.5㎝+0.5㎝+dart(3.0㎝). The front hip girth was made as H/4+2.5㎝+0.5㎝ and the back hip girth H/4+2.5㎝-0.5㎝. In “Type 4” with prominent abdomen and hips, considered were ① the increased front fold amount due to the abdominal protrusion, ② the increased back dart amount and the decreased back dart length owing to the hips prominent and ③ the front and back differences of waist and hip girth for the lateral view silhouette. Therefore the front waist girth was defined as W/4+0.5㎝+2.0㎝+fold(5.0㎝), the back waist girth as W/4+0.5㎝-2.0㎝+dart(4.0㎝), the front hip girth as H/4+2.0㎝+1.0㎝ and the back hip girth as H/4+2.0㎝-1.0㎝. The sensory evaluation of appearance and comfort was appeared more suitable on the experiment pattern than on the conventional pattern.

• Journal of the Institute of Electronics and Information Engineers
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• v.49 no.12
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• pp.256-264
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• 2012

The directional algebraic reconstruction technique (DART) using the trigonometric current pattern is one of the image reconstruction algorithms in electrical impedance tomography (EIT). This method needs to compute resistances between electrode pairs as using relation between the injected currents and measured voltages for the reconstruction of the inner image. The delay time is incurred in this process. Therefore this paper proposes modified directional algebraic reconstruction technique (mDART) using the adjacent current pattern instead of the trigonometric current pattern to solve the delay time for initial resistance values. The proposed method uses measured voltages instead of computed resistances in the reconstruction algorithm. Hence this method can eliminate the delay time because it does not use the resistances. In conclusion, the proposed method improves image quality and image reconstruction time by using the adjacent current pattern. To prove performance of the proposed method, we carried on computer simulation of various cases.

• Proceedings of the ESK Conference
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• 1997.10a
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• pp.40-55
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• 1997

The purpose of this study are to examine the characters of the lower half body shape in the middle aged women and to make slacks patttern on the base of four difference body shapes as follows. The lower half body shapes were classified into 4 types on the basis of their lateral view silhouette, whose characters were summarized as followings. (1) "Type 1" meant the right body shape with the standard protrusion of abdomen and hips. (2) "Type 2" showed the body shape with prominent hips, which had the flat abdominal silhouette and the greatly curved hips silhouette. (3) "Type 3" was the body shape with the prominent abdomen and the flat hips, in which the frontal view silhouette of the abdomen was greatly curved and the rear view silhouette of hips is less curved. (4) "Type 4" was characterized with prominent abdomen and hips. The slaks patterns were based on the lower half body shape characters and resulted in followings. (1) In the type 1, little difference from conventional patterns was seen in experiment pattern, in which the front waist girth was W/4{\times}0.5cm+0.5cm+fold(2.5cm) and the back waist girth W/4+0.5cm-0.5cm+dart(3.5cm). The front hip girth was defined as H/4+2.0cm+0.5cm and the back hip girth as H/4+2.0cm-0.5cm due to its increased ease amount produced by abdominal fat deposition. (2) In the type 2 experimental pattern, the front and back differences of the waist girth and the hip girth were defined as 1.0cm and 2.0cm separately. Accordingly, the front waist girth was W/4+0.5cm+ 1.0cm+fold(2.0cm), the back waist girth W/4+0.5cm-1.0cm+dart(6.5cm), the front hip girth H/4+2.0cm+1.0cm and the back hip girth H/4+2.0cm-1.0cm. (3) In type 3, the front waist girth was set up as W/4+0.5cm+0.5cm+fold (4.5cm) for the increased front fold amount and the back waist girth was W/4+0.5cm+0.5cm+dart(3.0cm). The front hip girth was made as H/4+2.5cm+0.5cm and the back hip girth H/4+2.5cm-0.5cm. (4) In type 4, considered were $\circled1$ the increased fornt fold amount due to the abdonimal protrusion, $\circled2$ the increased back dart amount and the decreased back dart length owing to the hips prominent and $\circled3$ the front and back differences of waist and hip girth for the lateral view silhouette. Therefore the front waist girth was defined as W/4+0.5cm+2.0cm+flod (5.0cm), the back waist girth as W/4+0.5cm-20.cm+dart(4.0cm), the front hip girth as H/4+2.0cm+1.0cm and the back hip girth as H/4+2.0cm-1.0cm. The sensory evaluation of appearance and comfort was appeared more suitable on the experiment pattern than on the conventional pattern.

• Fashion & Textile Research Journal
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• v.16 no.6
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• pp.921-926
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• 2014

The aim of this study is to develop upper bodice pattern for obese girls aged 10~12 by using 3D virtual garment simulation system. The criteria for subjects in this study were girls who had over 1.46 of the R$\ddot{o}$hrer Index. A total of 229 schoolgirls who met these criteria were enrolled. The results of this study are as follows: First, by using 3D virtual garment simulation, new upper bodice pattern considered obese-schoolgirls was development. The basic numerical formula were as follows ; bust girth B/2+4.5, armhole depth B/4-1, waist girth W/4+0.5+dart amount, front chest width B/6+2, back width B/6+2, neck width B/12-0.5 and neck depth B/12+0.5. Second, armhole darts were added to compensate the loose amount of front armhole and dart manipulation was used to ensure a better appearance on armhole in the design. The dart side line was modified concavely to help cover the protruding stomach. Curved lines on the armhole were significantly relieved using dart manipulation and the darts side line was modified concavely to reduce the tightness around the front waist darts. Third, according to the results of the new upper bodice pattern's appearance evaluation, it estimated more highly than existing pattern in silhouette and ease amount, confirming that new upper bodice pattern was appropriate for the obese-schoolgirls. This study is expected to serve as one of important basic data for ensuing studies that may utilize 3D virtual garment simulation system with 2D patterns.

• Mass Spectrometry Letters
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• v.6 no.1
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• pp.1-6
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• 2015

Direct analysis in real time mass spectrometry (DART-MS) is one of the variants of ambient mass spectrometry. The ionization process of DART-MS is in open environment and only takes few seconds, so it is suitable for fast analysis. Actually, since its introduction in 2005, more and more attentions have been drawn to its various applications due to its excellent properties, e.g., fast analysis, and no or less sample preparation, high salt tolerance and so on. This review summarized the promising features of DART-MS, including its ionization mechanism, equipment modification, wide applications, coupling techniques and extraction strategies before analysis.