• 대한안전경영과학회지
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• 제15권2호
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• pp.55-61
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• 2013

For years, many studies have mainly been investigated in a complicated human motion analysis. Recently, many motion analysis equipments have been studied and developed. Therefore, the more complex human movement analyses are possible, we have enabled us to perform more and more complicated human movement analyses. A Three-dimensional(3D) motion analysis on of the several methods is a useful tool for analyzing the human motion analysis. The purpose of this study was to develop the 3D human motion analysis using a kalman filter algorithm and a gyro sensor. The algorithm and sensor were used to human motion analysis with high-speed motion capture. In this study, the developed system will be adapted to facilitate golf swing analysis. Using the developed system, golfers and coaches who do not have advanced biomechanical knowledge can easily be used to their golf swing analysis. Future study is necessary for more practical and efficient area such as other sports industries, 3D game industries, rehabilitation training, etc..

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2009년도 정기 학술대회
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• pp.530-533
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• 2009

This study deals with 2D and 3D nonlinear seismic damage analysis of a concrete gravity dam using the finite element program ABAQUS and the concrete damaged plasticity model. 2D and 3D spillway sections of the dam are simulated. First the frequency analysis is conducted to compare the fundamental frequency and estimate the value of damping coefficient. Then the seismic analysis is conducted using the simulated ground acceleration motion. The relative displacement between the crest and bottom of the dam is obtained and compared for the maximum value and occurrence time. The results indicate that the plane-stress assumption gives similar results of maximum relative displacement and final damage distribution with 3D analysis.

• 한국철도학회논문집
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• 제9권2호
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• pp.180-186
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• 2006

In this study, a large-scale laboratory model test, 2-D and 3-D numerical analyses were conducted to verify the reinforcement effect by utilizing geotextile bag on the railway roadbed. Static loading which simulated train load was applied on the geotextile bag-reinforced railway roadbed and also unreinforced railway roadbed, Computer program named Pentagon which is a part of FEM programs was used in the numerical analysis. Based on the results of laboratory test, 2-D and 3-D numerical analyses, the effect of load distribution and settlement reduction was found to be depending on the geotextile characteristics, tensile strength of geotextite, and interface friction angle between geotextile bags. In general, the result of 2-D and 3-D numerical analyses shows lower value than that of laboratory test. Also, the result of 3-D numerical analyses shows lower value than that of 2-D numerical analyses because of its stress transfer effect.

• Korean Chemical Engineering Research
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• 제55권6호
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• pp.854-860
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• 2017

본 연구에서는 di-(2-ethylhexyl)-phosphoric acid (D2EHPA)와 carbon nanotubes (CNTs)를 polysulfone (PSf)에 고정화시켜 PSf/D2EHPA/CNTs 비드를 제조하였으며, 제조한 비드에 의한 Sr(II)의 제거특성을 살펴보았다. Scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR) 및 Thermo gravimetric analysis (TGA) 분석을 통하여 PSf/D2EHPA/CNTs 비드의 형태적 특성들을 조사하였다. PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거는 운전시간 60 min 정도에서 평형에 도달하였으며, 속도 실험결과는 유사 2차 속도식에 잘 부합하는 것으로 나타났다. 또한 PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거에서 Langmuir 식으로부터 구한 최대 제거량은 4.75 mg/g이었다. PSf/D2EHPA/CNTs 비드에 의한 Sr(II)의 제거효율은 추출제 D2EHPA 만을 사용하는 경우보다 CNTs를 첨가함으로써 Sr(II)의 제거량이 2.5배 정도 향상되는 결과를 보였다.

• 대한시과학회지
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• 제20권4호
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• pp.413-420
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• 2018

목적 : MR8 로 제조된 안경렌즈에서 굴절력별로 나누어 투과율을 측정하여 광학적 시험 및 청광 영역을 David L.의 분석법을 적용하여 분석하였다. 방법 : 시중에서 판매되고 있는 MR8 로 제조된 -8.00D, -7.00D, -6.00D, -5.00D, -4.00D, -3.00D, 0.00D의 렌즈를 선정하여 UV-VIS Spectrophotometers(SolidSpec 3700)로 200~1000nm까지 5nm 간격으로 투과율을 측정하고, 청광영역(380~500nm)을 David L.의 청광분석 방법을 적용하여 분석하였다. 결과 : 연구에 선정한 MR8렌즈들 모두 UV영역을 거의 모두 차단하였다. -8.00D의 렌즈가 청광영역에서 투과율 59.56%로 가장 낮게 측정되었고 또한, David L. 분석에 따른 청광영역1과 2에서 낮은 값이 측정되었다. 적외선 영역에서는 모든 렌즈의 투과율이 점진적으로 감소하였다. 그리고 시감투과율에서 평균 23.67%~26.33%의 계산값을 얻었고 -4.00D부터 점진적으로 감소하였다. 결론 : David L.의 분석법을 적용하면, 청광 1영역에서는 최소 41.28%, 최대 46.60%가 측정되었으며, 청광 2영역에서는 최소 87.30%, 최대 97.55%가 측정되었다. 그리고 청광 3영역에서는 최소 86.83%, 최대 96.55%가 측정되었으며 평균 94%였다. 시감투과율에서는 측정된 렌즈 중 -3.00D렌즈가 26.33%으로 가장 높은 값이 계산되었으며, -8.00D렌즈가 23.67%으로 가장 낮은 계산 값을 얻었다.

• Bulletin of the Korean Chemical Society
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• 제26권12호
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• pp.2027-2032
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• 2005

This paper demonstrates details of thermal behavior of Langmuir-Blodgett (LB) film of poly(tert-butyl methacrylate) (PtBMA) by using the principal component analysis based two-dimensional correlation spectroscopy (PCA2D) through eigenvalue manipulating transformation (EMT). By uniformly lowering the power of a set of eigenvalues associated with the original data, the smaller eigenvalues becomes more prominent and the subtle contribution from minor components is now highlighted much more strongly than the original data. Thus, the subtle difference of thermal behavior of LB film of PtBMA from minor components, which is not readily detectable in the conventional 2D correlation analysis, is much more noticeable than the original data. PCA2D correlation spectra with EMT operation for the temperature-dependent IR spectra of LB film of PtBMA reveal the hidden property of phase transition processes during heating.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.358-363
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• 2008

Through this study, 2D multibody dynamics models for analysis of train collisions have been developed to evaluate the crashworthiness requirements of the TSI regulation. The crashworthiness regulation requires some performance requirements for two heavy collision accident scenarios; a train-to-train collision at the relative speed of 36 kph, and a collision against a standard deformable obstacle of 15 ton at 110 kph. The complete train set will be composed of hybrid model with 2D and 1D model. Using numerical analysis of the hybrid model, some crashworthy design were evaluated in terms of mean crush forces and energy absorptions for main crushable structures and devices. especially, 2D model can evaluate overriding effect in train collisions. It is shown from the simulation results that the suggested hybrid model can easily evaluate the crashworthiness requirements.

• 한국음향학회지
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• 제31권1호
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• pp.11-18
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• 2012

본 논문은 경계가 주기적으로 변하는 주름관에 음파가 전파할 때 발생하는 차단주파수밴드 (stopband)를 이론 및 BEM으로 해석한 내용을 다루었다. 2-D 덕트를 고려하였으며 경계가 길이방향의 사인함수로 변하는 주름관에서 주름의 크기가 덕트 높이에 비해 충분히 작은 경우 다중 스케일 섭동법 (Multiple Scaling Perturbation Method)을 이용하여 해를 구하였다. 주파수가 복소수가 되는 조건에서 Bragg 공진과 Non-Bragg 공진에서 발생하는 차단주파수밴드의 형성조건을 구하였다. 2-D BEM 해석을 수행하여 주름관의 삽입손실 (Insertion Loss)을 계산하였으며 이론적으로 예측한 차단주파수밴드의 존재를 확인하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.301-304
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• 2003

Nowadays, hydration heat analysis using FEM is common in thermal crack control of concrete structure. Many kinds of general FEM programs for hydration heat analysis are used in practice. But there are some problems in this using. In this study hydration heat analysis of wall according to placement length are performed. In this results we could get two conclusions. First, general structures like wall having general geometry and construction condition have similar behavior. So it is not necessary to analysis thermal crack in every case. Second, the results of 2D analysis is possible to be applied instead of those of 3D analysis because the results of 2D analysis is similar to 3D analysis in long wall having about 15~18m or over length at 3m height.

• 한국정보기술학회 영문논문지
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• 제9권2호
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• pp.107-113
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• 2019

In this study, we examined the feasibility of considering the transverse edge effect of flat type linear induction motor as 2D finite element analysis (FEA) by changing the resistivity of secondary conductor. For this purpose, the 3D FEA analysis results were compared with the 2D FEA analysis results with the change of the resistivity of the secondary conductors. As a result, simply changing the resistivity could not accurately account for the transverse edge effect of LIM because of leakage components that could not be considered by 2D FEA.