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1

오픈소스 코드를 이용한 통합 전산유체역학 환경 구축

강승훈, 손성만, 오세홍, 박원만, 최청열

한국융합보안학회 융합보안논문지 제18권 제1호 2018.03 pp.33-42

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CFD 해석 기술은 열 또는 유체 유동과 관련한 산업 전분야에 걸친 제품의 설계, 개발 시에 컴퓨터를 응용하는 해석 기술로서, 컴퓨터를 이용한 가상 시험 (시뮬레이션)을 통해 개발기간 단축, 비용절감 등을 이루고자 활용되고 있다. 그러나 CFD 해석을 위해서는 고가의 외산 상용 CFD 소프트웨어의 사용이 일반적이다. 이에 대한 대안으로 Opensource 기반의 CFD 소프트웨어가 있으나 텍스트 인터페이스 환경만을 지원하기 때문에 전문적인 지식을 가진 사용자만이 사용 가능하다. 이에 본 기술개발에서는 상용 CFD 해석 소프트웨어 수준의 신뢰도를 가지며, 국내외적으로 많은 사용자를 확보하고 있는 Opensource 기반의 CFD 소프트웨어인 OpenFOAM에 대하여 그래픽 기반 환경 설정을 지원하도록 구성하여 전문가뿐만 아니라 초보자도 쉽게 CFD 해석 환경의 구축이 가능하도록 하는 환경을 개발하였다. 또한 개발된 시스템은 CFD 해석을 위한 전처리(형상 및 격자생성) 환경과 후처리(결과 분석 및 가시화)를 위한 환경을 연계를 지원하여 하나의 플랫폼안에서 통합된 CFD 해석 프로세스가 가능하도록 지원한다.
CFD analysis is an analytical technique that applies a computer to the design and development of products across the e ntire industry for heat or fluid flow. This technology is used to shorten the development period and reduce costs through computerized simulation. However, the software used for CFD analysis is now required to use expensive foreign software. The Opensource CFD analysis software used in the proposed system has reliability of commercial CFD analysis software and has various user groups. However, for users who have expert knowledge, Opensource CFD software which supports o nly text interface environment, We have developed an environment that enables the construction of a CFD analysis enviro nment for beginners as well as professionals. In addition, the proposed system supports the pre-processing (design and me shing) environment for CFD analysis and the environment for post-processing (result analysis & visualization), enabling t he integrated CFD analysis process in one platform.

4,000원

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4

척추 질환 치료/재활을 위한 노령 척추 CAE 모델 및 의료기기 제품화 기술

김윤혁, 박원만

[Kisti 연계] 대한기계학회 기계저널 Vol.55 No.3 2015 pp.47-50

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이 글에서는 척추 생체역학 연구를 위한 다양한 컴퓨터 시뮬레이션 생체역학 모델을 소개하고, 이를 이용한 척추 퇴행성 질환 관련 임상 및 의료기기 개발 관련 연구 사례들을 소개하고자 한다.

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5

시뮬레이션에 기반한 휴머노이드 로봇 두 대의 안정적인 물체 운반 및 제어 연구

김한근, 김형진, 박원만, 김윤혁, 김동한, 안진웅

[Kisti 연계] 제어로봇시스템학회 제어로봇시스템학회 논문지 Vol.16 No.2 2010 pp.120-125

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This paper proposes an intelligent PID/Fuzzy control system for two humanoid robots to transport objects stably. When a robot transports an object while walking, a whole body system of a robot may not be stable due to vibration or external factors from a different departure speed error and a body movement of walking robots. Therefore, it is necessary to measure the horizontal and vertical locations and speeds of object, then calibrate the difference of departure speed between robots with PID/Fuzzy control. The results of simulation with two robots indicated that a proposed controller makes robots to transport an object stably.

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6

인공 추간판 치환술 후 경추의 생체역학적 특성

박원만, 주증우, 김경수, 이기석, 김윤혁

[Kisti 연계] 대한기계학회 대한기계학회논문집A Vol.33 No.7 2009 pp.637-644

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We have analyzed the biomechanical characteristics of cervical spine after total disc replacement using finite element analysis. A finite element model of C2-C7 spinal motion segment was developed and validated by other experimental studies. Two types of artificial discs, semi-constraint and un-constraint, were inserted at C6-C7 segments. Inferior plane of C7 vertebra was fixed and 1Nm of moment were applied on superior plane of C2 vertebra with 50N of compressive load along follower load direction. Mobility of the cervical spine in which each artificial disc inserted was higher than that of intact one in all loading conditions. Also, high mobility at the surgical level after total disc replacement could lead higher facet joint force and ligaments axial stresses. The results of present study could be used to evaluate surgical option and validate the biomechanical characteristics of the implant in total disc replacement in cervical spine.

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7

컴퓨터 네비게이션을 이용한 슬관절 전치환술에서 핀 홀에 의한 응력 집중: 유한요소해석

박형균, 김윤혁, 박원만, 김경수

[Kisti 연계] 대한의용생체공학회 Journal of biomedical engineering research : the official journal of the Korean Society of Medical & Biological Engineering Vol.29 No.6 2008 pp.451-456

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Total knee arthroplasty(TKA) using computer-assisted navigation has been increased in order to improve the accuracy of femoral and tibial components implantation. Recently, a few clinical studies have reported on the femoral stress fracture after TKA using computer-assisted navigation. The purpose of this study is to investigate the stress concentration around the femoral pin-hole for different pin-hole diameter, the modes of pin penetration by finite element analysis to understand the effects of pin-hole parameters on femoral stress fracture risk. A three-dimensional finite element model of a male femur was reconstructed from 1 mm thick computed tomography(CT) images. The bone was rigidly fixed to a 25 mm above the distal end and 1500 N of axial compressive force and 12 Nm of axial torsion were applied at the femoral head. For all cases, transcortical pin penetration mode showed the highest stress fracture risk and unicortical pin penetration mode showed the lowest stress concentration. Pin-hole diameter increased the stress concentration, but pin number did not increase the stress dramatically. The results of this study provided a biomechanical guideline for pin-hole fracture risk of the computer navigated TKA.

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8

무릎관절 재활 운동기기의 운동범위 분석

박원만, 김윤혁

[Kisti 연계] 대한기계학회 대한기계학회 학술대회논문집 2008 pp.1515-1517

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The purposes of this study were to measure the ranges of motion in knee joint and during continuous passive motion(CPM) treatment and to computationally calculate joint angles at the knee joint dependent on the CPM machine design and its application. Four CPM machines and eleven candidates were recruited for this study. Experimental and numerical studies have been peformed to calculate the range-of-motion of CPM machines. From the experimental measurements, the average range of motions at the knee joint for the CPM machine #1, #2, #3, and #4 were lower than the manufactures suggested values due to improper alignments of the hip and knee joints to the CPM machines. Different design of CPM machine generated different outcomes of the ROM at the knee joints during CPM. The experiments and kinematic simulation in this study could be used to provide useful guidance in the treatment of CPM after joint surgery.

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9

컴퓨터 네비게이션 슬관절 전치환술에서 노화에 따른 핀 홀에서의 대퇴골 골절 위험성

박형균, 박원만, 김윤혁

[Kisti 연계] 대한기계학회 대한기계학회 학술대회논문집 2008 pp.1518-1520

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Recent clinical studies have shown that computer navigation for total knee arthroplasty (TKA) provides improved component alignment accuracy. However, femoral stress fracture after computernavigated TKA have been reported due to the pin hole and we hypothesized that osteoporosis would be one of the key factors in pin hole fracture after computer-navigated TKA. We investigated the von-Mises stress around the femoral pin-hole for different elastic modulli and ultimate stresses and four different pin penetration modes to understand the aging effect on femoral stress fracture risk after computer-navigated TKA by finite element analysis. In this study, aging effect was shown to increase the femoral stress fracture risk for all pin penetration modes. Especially, aging effect was shown dramatically in the transcortical pin penetration mode.

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10

추간판 치환술이 요추분절에 미치는 생체역학적 영향 : 유한요소해석

박원만, 김기택, 홍규표, 김윤혁, 오택열

[Kisti 연계] 한국CAD/CAM학회 한국CAD/CAM학회 논문집 Vol.13 No.1 2008 pp.58-66

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The artificial discs have recently used to preserve the motion of the treated segment in lumbar spine surgery. However, there have been lack of biomechanical information of the artificial discs to explain current clinical controversies such as long-term results of implant wear and excessive facet contact forces. In this study, we investigated the biomechanical effects of three artificial implants on the lumbar spinal segments by finite element analysis. The finite element model of intact lumbar spine(L1-S) was developed and the three implants were inserted in L4-L5 segment of the spine model. 5 Nm of flexion and extension moments were applied on the superior plate of L1 with 400 N of compressive load. Excessive motions and high facet contact forces at the surgical level were generated in the all three implanted models. In the flexion, the peak von-Mises stresses in the semi-constrained type implant was higher than those in the un-constrained type implant which would cause wear on the polyethylene core. The results of the study would provide a biomechanical guideline for selecting optimal surgical approach or evaluating the current design of the implants, or developing a new implant.

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11

디지털 인체 모델 콘텐츠의 개발과 활용

김윤혁, 박원만

[Kisti 연계] 한국콘텐츠학회 한국콘텐츠학회지 Vol.5 No.1 2007 pp.76-80

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12

유한요소해석을 이용한 이형성 고관절 절골술에 대한 수술예비계획

박원만, 김윤혁, 김경수, 조태준, 오택열

[Kisti 연계] 한국정밀공학회 한국정밀공학회 학술대회논문집 2007 pp.205-206

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13

슬관절 유한요소 모델을 이용한 후방십자인대 재건술의 생체역학적 평가

김윤혁, 박원만, 김상훈, 김경수, 이순걸

[Kisti 연계] 한국정밀공학회 한국정밀공학회지 Vol.24 No.12 2007 pp.7-12

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14

인공슬관절 치환술에서 임플란트 경골 기저에 나타나는 회전오정렬의 생체역학적 영향

김상훈, 김윤혁, 박원만, 이순걸

[Kisti 연계] 한국정밀공학회 한국정밀공학회 학술대회논문집 2007 pp.207-208

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15

척추고정용 형상기억합금 동적안정기기의 생체역학적 성능 평가

김윤혁, 박원만, 김경수, 박형균, 주증우, 박경우

[Kisti 연계] 한국정밀공학회 한국정밀공학회 학술대회논문집 2006 pp.517-518

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In this study, a commercial fixation device, BioFlex, which was designed with shape memory alloy(SMA) for dynamic stabilization of spine was biomechanically evaluated. The finite element model of intact lumbar spine from L1 to S was developed using CT images. Also, low FE models of 2-level(L4-L5-S) and 3-level(L3-L4-L5-S) posteriori fixation using titanium(Ti) rod and BioFlex(SMA) rod. The rotations of bone segments in the intact model and four models were predicted. Although the rotations of the BioFlex fixation model were smaller than those of the intact model, they were relatively larger than those of Ti fixation. The present can be applied for not only evaluation of the stability of interbody fixator, but also development of new implant.

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16

척추 파열 골절 치료를 위한 전.후방 척추고정술의 생체역학적 안정성 평가

박원만, 김윤혁, 박예수, 오택열

[Kisti 연계] 한국정밀공학회 한국정밀공학회 학술대회논문집 2006 pp.187-188

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A 3-D finite element model of human thoracolumbar spine (T12-L2) was reconstructed from CT images. Various anterior and posterior instrumentation techniques were performed with long cage after corpectomy. Six loading cases were applied up to 10 Nm, espectively. The rotations of T12 with respect to L2 were measured and the stiffnesses were calculated as the applied forces divided by the segmental rotations. The posterior fixation technique increased the stiffness of the spine the most. The addition of anterior rod from 1 to 2 increased the stiffness significantly without posterior fixation, but no effect was found with posterior fixation. We found that different fixation techniques changed the stiffness of the spine.

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17

유한요소해석을 이용한 이형성 고관절의 선반형성술에 대한 생체역학 해석

박원만, 김윤혁

[Kisti 연계] 한국정밀공학회 한국정밀공학회 학술대회논문집 2006 pp.519-520

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The aim of this study was biomechanical analysis of shelf operation in patients with dysplastic hip joint by finite element contact analysis. Two dimensional CT images were used to construct the finite element models to analyze the contact pressure, and the 3D expansion of the Ninomiya's method was used in the calculation of the resultant force in the hip joint. The surgery recovered the center-edge angles to the normal anatomical range and increased the contact areas in two patients. The maximum contact pressures and von-mises stresses were decreased. The present study provides the biomechanical guideline of optimal surgical parameters to maximize the surgical efficiency and the clinical outcomes in dysplastic hip joint using the shelf operation.

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18

세 가지 인공 추간판의 생체역학적 평가

박원만, 주증우, 김경수, 김윤혁

[Kisti 연계] 한국정밀공학회 한국정밀공학회 학술대회논문집 2006 pp.123-124

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19

방사성 폐기물 작업 중의 피폭서량 예측 프로그램 개발

박원만, 김윤혁, 황주호

[Kisti 연계] 대한인간공학회 Journal of the ergonomics society of Korea Vol.24 No.2 2005 pp.71-77

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In spite of the importance of nuclear power as one of major electric energies in Korea, the nuclear safety has become the most serious social issue in the operation of the nuclear power plant. In this paper, a virtual work simulation program was developed to predict exposure dose during radiation work in radwaste storage. The work simulation program was developed. using $Java ^{TM}$applet and VRML-virtual reality modeling language. A numerical algorithm to find the optimal work path which minimize exposure dose during the given work, was developed and exposure dose on the optimal work path was compared with that on the shortest path. Comparing with the shortest path for the given work, the predicted optimal path consumed longer work time by II% but reduced total exposure dose by 46%. The simulation result showed that the exposure dose depended on not only work time, but also the distance between the worker and the radiation source. The developed simulation program could be a useful tool for the planning of radioactive waste work to increase the radiation safety of workers.

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20

음향센서를 이용한 역지 밸브의 감시 및 진단 알고리듬 개발

성승환, 허섭, 김정수, 박원만, 차대범, 김정택

[Kisti 연계] 한국원자력학회 한국원자력학회 학술대회논문집 2004 p.221

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