• 한국의류산업학회지
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• 제23권6호
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• pp.744-757
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• 2021

This study aims to develop a bodice and a jacket in 3D of the late 19th to early 20th based on the pattern drafting book of Gordon S. S., which contains body measurement method and pattern drafting system. The findings of this research are as follows. First, female tops of the late 19th to early 20th century are categorized as outer, jacket, vest, and bodice. Of these, this study highlights the jacket, which can be divided into 4 types: 4 kinds of basic jacket, 2 kinds of riding jacket, bolero jacket, and newmarket jacket. Second, by referring to Gordon's pattern drafting system and book, a bodice was developed in 3D format based on the adherence to the following steps: analysis of the pattern drafting system, pattern drafting, 3D virtual simulation, 3D virtual fitting analysis, and the pattern correction. A bodice pattern corrected by 3D virtual clothing simulation results was proposed. Last, a basic sleeve and collar pattern for a basic jacket was drafted, which was followed by the correction and transformation of the bodice pattern. The jacket developed shows great fit except for the issues at the armhole line and shoulder, which were caused by the unique shape of the sleeves(big sleeve head) of the time. The study attempted to develop the past costumes in 3D, providing the basis for interdisciplinary research in the field of fashion history field and suggesting a new approach for the virtual restoration of costumes. Future studies should target to 3D virtual simulation in accordance to the 3D avatar pose in the developed virtual costume.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.593-595
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• 2001

This paper presents the performances of eddy current brake for the vehicle. Because travelling magnetic field problem of eddy current brake cannot be analyzed accurately in Galerkin finite element method(FEM) for large cell Peclet number, the characteristics are analyzed by using 2-D upwind FEM. The magnet stack width are compensated in order to increase the precision of the solution. The validity of the analysis results is obtained by comparing with experimental data.

• International Journal of Aeronautical and Space Sciences
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• 제17권2호
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• pp.149-156
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• 2016

The hypersonic flow on the stagnation streamline of a blunt body is analyzed with quasi one-dimensional (1-D) Navier-Stokes equations approximated by adopting the local similarity to the two-dimensional (2-D)/axisymmetric Navier-Stokes equations. The governing equations are solved using the implicit finite volume method. The computational domain is confined from the stagnation point to the shock wave, and the shock fitting method is used to find the shock position. We propose a boundary condition at the shock, which employs the shock wave angle in the vicinity of the stagnation streamline using the shock shape correlation. As a result of numerical computation conducted for the hypersonic flow over a sphere, the proposed boundary condition is shown to improve the accuracy of the prediction of the shock standoff distance. The quasi 1-D Navier-Stokes code is efficient in computing time and is reliable for the flow analysis along the stagnation streamline and the prediction of heat flux at the stagnation point in the hypersonic blunt body flow.

• 한국지반신소재학회논문집
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• 제4권2호
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• pp.11-18
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• 2005

본 연구에서는 지오그리드로 보강된 성토지지말뚝의 보강 및 아칭효과를 분석하기위하여 실대형 현장모형시험과 2차원 평면변형 수치해석을 수행하였다. 연약지반 상 지오그리드로 보강된 성토지지말뚝의 현장모형시험은 $3{\times}3$ 콘크리트말뚝을 말뚝간격변화에 따라 연약지반에 타입하고 지오그리드를 포설한 후, 침하량, 수직하중, 지오그리드의 스트레인을 계측하였다. 또한 2차원 수치해석은 범용 유한차분해석 프로그램인 FLAC 2D를 이용하여 현장모형시험에 대한 비교해석을 실시하였다. 각각의 현장모형시험 및 수치해석결과, 말뚝 보강에 의한 지반의 아칭효과는 말뚝캡 중앙부에서 가장 크게 발생하였으며, 말뚝-지반-지오그리드의 강성차이로 인하여 지오그리드에 인장력이 유발되고 지오그리드 인장력발생에 의한 하중전이로 전체 지오그리드 및 성토지지말뚝 보강지반의 부등침하가 급격히 감소하였다. 또한, 말뚝간격에 따른 보강효과는 말뚝간격 $D/b{\geq}6.0$일 경우 보강효과가 거의 없는 것으로 도출되었다.

• 전기의세계
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• 제29권2호
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• pp.129-132
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• 1980

For large gas-insulated systems, the conductor utilized possess some degree of surface roughness which locally enhances the applied field at highpressure in $SF_{6}$. In order to investigate the effect of field enhancement on the breakdown field strength, the spheric protrusion was employed which gives a quantitative analysis on field enhancement. For further investigations on the breakdown level and polarity effect in $SF_{6}$, the repeated breakdown tests were performed with d.c. voltage at pressures up to about 4 bar. The experimental results show that the breakdown level does vary noticeably due to successive voltage applications and the breakdown field strength measured for a test gap with the cathode protrusion is markedly lower than that determined from the identical anode protrusion.

• 한국입자에어로졸학회지
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• 제18권4호
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• pp.109-127
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• 2022

Recently, low-cost particulate matter (PM) sensors have been widely used in monitoring mass concentration. Maintaining the accuracy of the sensors is important and requires rigorous performance evaluation and calibration. In this study, two commercial low-cost PM sensors(LCS), Plantower PMS3003 and Plantower PMS7003, were evaluated in the laboratory and field with a reference-grade PM monitor (GRIMM 11-D). Laboratory evaluation was conducted with single/mixed particles of PSL (Poly Styrene Latex) in an acrylic chamber at 20℃ and relative humidity of 20%. Field evaluation was conducted inside a building of Yonsei University (Shinchon) from February 12 to March 31, 2022. In both evaluations, LCS measured values became different from reference measured values when the relative humidity was high or the outdoor air PM10/PM2.5 ratio was high. Based on the field evaluation, the LCS measured values were corrected through four different regression analysis models. As a result, the multivariate polynomial regression analysis model showed highest matching with the reference PM monitor (PM2.5 >0.9, PM10 >0.85). In this model, the PM10/PM2.5 ratio and relative humidity were chosen as independent variables.

• 전기학회논문지
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• 제56권12호
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• pp.2135-2144
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• 2007

This paper presents system design of the slotless double-side Permanent Magnet Linear Synchronous Machine system (PMLSM) through magnetic field analysis and dynamic modeling. In our analysis, 2-D analytical treatments based on the magnetic vector potential were adopted to predict magnetic field with space harmonics by PM mover magnetization and stator winding current. From these, the design parameters such as inductance, Back-emf, and thrust are estimated. And, the electrical dynamic modeling including synchronous speed is completed by calculation of a DC link voltage in effort to obtain the accurate mechanical power from Space Vector Pulse Width Modulation(SVPWM). Therefore, the system design of PMLSM is performed from estimation of design parameters according to PM size and coil turns in magnetic field and from calculation of a DC link voltage to satisfy base speed and base thrust represented as the maximum output power in dynamic modeling. The estimated values from the analysis are verified by the finite element method and experimental results.

• 대한원격탐사학회지
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• 제36권5_4호
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• pp.1195-1207
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• 2020

GeoWeb 기술이 발전하면서 재난관리 분야에서도 웹을 통한 2D/3D 공간정보 서비스에 대한 관심과 활용도가 높아지고 있다. 본 논문은 재난사고 현장에서 수집된 다양한 공간정보를 웹 환경에서 시각화하기 위한 3D 공간정보 맵핑 플랫폼 구축에 관한 연구로서, 웹 개발 표준기술인 HTML5/WebGL과 오픈소스를 활용하여 재난사고 현장에서 다양한 형태로 수집된 2D/3D 공간 데이터와 대용량의 LiDAR 점군 데이터에 대한 웹기반의 공간정보 맵핑 서비스 방안을 제시하였다. 첫째, 오픈소스인 GeoServer의 WMS 서비스와 PostGIS를 이용하여 수집된 재난현장 조사 2D 데이터를 공간 DB로 구축한 후 웹 환경에서 렌더링하였다. 둘째, 웹 환경에서 대용량 3D 점군 데이터를 효율적으로 렌더링하기 위하여 다중 해상도의 옥트리 구조를 이용하여 점군 데이터를 2D 타일로 단순화하는 Potree 알고리즘을 적용하였다. 마지막으로 OpenLayers3를 기반으로 3차원 지도를 제어 및 측정하기 위한 기본·응용 기능을 Graphic User Interface(GUI)로 구현하여 2D/3D 공간정보의 웹 시각화를 위한 3D 웹 맵핑 파일럿 시스템을 개발하였다. 향후, 재난현장의 각종 2D 조사 데이터 및 다양한 공간영상정보를 구축된 웹기반 3차원 공간정보시스템에 중첩·표출함으로써 재난사고 과학조사 및 분석 업무에 활용될 수 있을 것으로 기대된다.

• 한국항해항만학회지
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• 제32권1호
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• pp.9-14
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• 2008

VOF법은 유체 체적 비율을 통해 밀도가 다른 두 유체를 한꺼번에 계산할 수 있는 수치해석 기법이다. 상용 CFD프로그램의 VOF옵션을 이용하여 자유수면 부근에서 정속으로 움직이는 물체 주위의 수치해석을 시도하였다. 검증 대상으로는 물 속에 잠겨있는 2차원 날개, 자유수면을 수직으로 관통하는 3원 날개, 그리고 컨테이너 선형이 사용되었다. 검증 결과 정도의 차이는 있지만 상용 코오드의 범용성을 어느 정도 확인할 수 있었고 자유수면 유동장을 모사하는데 VOF법이 무난히 활용될 수 있음을 알 수 있었다.

• 한국지반환경공학회 논문집
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• 제8권6호
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• pp.29-36
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• 2007

지표면 침하량, 침하 기울기 그리고 터널주변의 지반변위에 대한 관리와 예측은 도심지 터널 시공에 있어서 주요한 인자가 된다. 본 논문은 도심지 NATM터널의 변형거동에 대한 세밀한 분석을 위하여 사례분석과 수치해석적인 방법을 통하여 굴착에 따른 지반 평가와 거동 예측을 수행하였다. 수치해석적인 방법은 FLAC-2D 변형률 연화모델과 탄소성모델을 이용하였다. 현장계측은 지표면 침하와 지중변위를 수행하였으며, 계측결과는 시공중 설계물성치의 재설정에 이용되어졌다.