• 한국자동차공학회논문집
• /
• 제7권6호
• /
• pp.156-164
• /
• 1999

The body structure of a bus is generally assembled by using various spot welded box sectional members. The shape of window pillar joint is ordinarily built up by T-type member. It has been shown that T-type member has problems like high stress concentrations, low fatigue strength and low structural rigidity. In this study, to solve these problems a new approach to optimize the design of the bus window pillar joint was tried by FEM analysis and experiments. To describe the shape of the gusset connecting the vertical and horizontal members of the T-type window pillar joint B-spline curve was adopted and this curve was optimized . It was found that the new model developed could effectively improve fatigue durability an structural rigidity.

• 한국추진공학회:학술대회논문집
• /
• 한국추진공학회 2011년도 제37회 추계학술대회논문집
• /
• pp.801-804
• /
• 2011

추진제 탱크와 배관의 연결부에 대한 개념 설계단계로 해외 발사체의 배관 연결부를 조사하였고, 그 결과를 토대로 몇가지 대표 형상을 선정하여 유동해석을 수행하였다. 유동해석 결과 배관의 연결부 중 제일 유동특성이 좋은 것을 찾을 수 있었다, 하지만 큰 차이는 없었다. 그 이유는 배관이 길어서 배관 내부를 유체가 흐르면서 배관 내부 유동이 안정되는 것으로 판단된다.

• International Journal of Control, Automation, and Systems
• /
• 제4권4호
• /
• pp.495-505
• /
• 2006

A class of robust control for flexible joint manipulators with nonlinearity mismatched uncertainty is designed based on Lyapunov approach. The uncertainties are unknown but their values are within certain prescribed sets. No statistic information of the uncertainties is imposed. The control which utilizes state transformation via virtual control is proposed. The resulting robust control guarantees practical stability for the transformed system and later the stability for the original system is proved. The designed robust control is implemented by experiments in a 2-link flexible joint manipulator.

• 한국건축시공학회지
• /
• 제4권3호
• /
• pp.125-131
• /
• 2004

Nowadays, it seems we are in the high time of construction design because development of construction technology widen the option of construction exterior closing materials and deepen the high-tech construction method with all various materials. When we see the flow of construction market, the mainstream is the high-rise intelligent building, which makes the best use of the small midtown area efficently. Therefore, Alum curtain wall is becoming the main material of exterior construction, the concept of which is changing from just a simple window frame to an outer wall which has comprehensive function and capability. As we think of the importance of Curtain wall as a comprehensive outer wall, We should do thorough technical examination and verification at the stage of construction design and plan of carrying out construction.

• 한국기계가공학회지
• /
• 제16권1호
• /
• pp.102-111
• /
• 2017

An automobile ball joint is the element for connecting the control arm and the knuckle arm, allowing rotational motion. The ball joint consists of the stud, plug, socket, and seat. These components are assembled through the caulking process that consists of plugging and spinning. In the existing research, the pull-out strength and gap stiffness were calculated, but we did not consider the uncertainties due to the numerical analysis and production. In this study, the uncertainties of material property and tolerance are considered to predict the distributions of pull-out strength and gap stiffness. Also, pull-out strength and gap stiffness are predicted as the a distribution rather than one deterministic value. Furthermore, a robust design applying the Taguchi method is suggested.

• 한국구조물진단유지관리공학회 논문집
• /
• 제1권2호
• /
• pp.151-156
• /
• 1997

An experimental study was performed on the pull-out behavior of 90-deg standard hooks from exterior beam-column connections. The effects of the number of hooked bars of joint area were investigated. Under the pull-out action of hooked bars, the damage and cracking of joint area tends to be more extensive as the number of hooks pulling out from a joint increases. The pull-out strength and post-peak ductility of hooked bar are adversely influenced by the increase in number of hooks pulling out from an exterior joint. Current hooked bar anchorage design guidelines may be improved by considering the effect of the number of hooked bars on anchorage conditions at exterior joints.

• Journal of Computational Design and Engineering
• /
• 제1권1호
• /
• pp.55-66
• /
• 2014

A knee joint's longevity depends on the proper integration of structural components in an axial alignment. If just one of the components is abnormally off-axis, the biomechanical system fails, resulting in arthritis. The complexity of various failures in the knee joint has led orthopedic surgeons to select total knee replacement as a primary treatment. In many cases, this means sacrificing much of an other-wise normal joint. Here, we review novel computational approaches to describe knee physiotherapy by introducing a new dimension of foot loading to the knee axis alignment producing an improved functional status of the patient. New physiotherapeutic applications are then possible by aligning foot loading with the functional axis of the knee joint during the treatment of patients with osteoarthritis.

• 한국산학기술학회논문지
• /
• 제8권6호
• /
• pp.1332-1336
• /
• 2007

본 논문의 목적은 대형 교량건설시 정밀시공을 보장하기 위하여 지그접합부를 3차원 정밀설계하고 지그접합 시 문제점을 해결하기 위하여 시뮬레이션에 의한 검증작업을 거쳐 구조를 개선한다. 지그를 제작하여 설치할 때 많은 예산이 소요되므로 문제발생을 방지하고 소요되는 시간과 예산낭비를 방지함으로서 건설엔지니어링의 효율성을 높이고 기술경쟁력을 향상시킨다.

• Journal of the Korean Wood Science and Technology
• /
• 제41권2호
• /
• pp.100-104
• /
• 2013

Bearing occurs by the rotations of members induced from horizontal or vertical load at traditional wooden joint in frame. The bearing between wooden members is not occurring at the whole surface of joint, but occurring only at the particular bearing area. In this study, partial bearing according to the different grain direction was evaluated. The partial compressive strength showed 3 times higher than pure compressive strength perpendicular to grain, 1.5 times higher than parallel to grain and 3.3 times higher than both of them. It is expected that this result can be very importantly applied when evaluating and analyzing the actual behavior of traditional wooden mortise and tenon joint.

• 터널과지하공간
• /
• 제14권6호
• /
• pp.391-398
• /
• 2004

시추공에서 관찰된 절리면의 방향성과 위치자료를 이용하여 개착면에서의 trace 분포를 예측하는 대수학적 기법을 개발하였다. 절리 trace 예측은 절리면과 투영면의 3차원 평면식을 활용하여 대수학적으로 수행되며, 개별 불연속면의 영속성을 고려하여 투영 영역 내에서 trace가 표출되는 범위가 산정된다. 절리 예측기법을 활용하여 슬럼핑 현상에 의해 구조적으로 불안정한 김해 내삼사면의 안정성 및 보강 계획의 적정성을 분석하였다. DOM 시추작업을 수행하여 암반구조 특성을 조사하였으며, 사면 파괴를 유발시킬 수 있는 절리들을 추출하여 심도별 지반거동 특성을 분석하였다. 또한, 사면보강을 위하여 계획된 앵커 정착부에서의 절리분포 및 거동양상을 분석하고 앵커 보강의 효율성을 고찰하였다.