http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자율 무인 무인잠수정 OKPO-600의 개발과 실해역 성능 확인
주영석(Young Seok Joo),조경남(Kyung Nam Jo),김주일(Ju Il Kim),이광민(Kwang Min Lee),한성곤(Sung Gon Han),박명철(Myung Chul Park),유진수(Jin Su Ryu),우종식(Jong Sik Woo),한민구(Min Gu Han) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
This paper deals with autonomous underwater vehicle (AVY) named OKPO-600 which has been designed and manufactured by Daewoo Shipbuilding & Marine Engineering(DSME). OKPO-600 is implemented to be 2.6m in length, 0.28m in diameter and weight about 70㎏ in air. A test is conducted to verify the basic function of OKPO-600.
한옥진(Ok-Jin Han),주영석(Young-Seok Joo),한흥국(Heung-Kuk Han) 산업기술교육훈련학회 2007 산업기술연구논문지 (JITR) Vol.12 No.1
The snow melting system by electric heating wires which is adopted in this research is a part of road facilities to keep surface temperature of the road higher than freezing point of water for melting the snow accumulated on it. The system is designed to increase traffic safety and capacity. The electric heating wires are buried under paved road at a certain depth and operated automatically and manually. Design theory, amount of heating, and installation standard vary according to economic situation, weather condition, and installation place and purpose of each country which is applying the system. We tried to figure out the appropriate range of required heat capacity and installation depth and intervals for solving snowdrifts and freezing problems with the minimum electric power consumption. The most important factors of designing the system are calculation of heating capacity depends on weather condition and depth and interval of the electric heating wires depend on air condition respectively. We performed this research under the air temperatures(-2℃, -5℃, -8℃) , the intervals of the electric heating wires(70mm, 100mm, 125mm), and installation depths(50mm, 70mm, 100mm). The results of this research were verified by a program Fluent.
비뉴턴유체 해석을 위한 Fully Implicit ISPH 모델 개발
신동빈(Dongbin Shin),김지환(Jihwan Kim),변제윤(Je-Yun Byun),주영석(Young-Seok Joo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Highly viscous fluids are used in a wide range of applications such as natural disasters, computer graphics, and food industries, etc. Numerical approaches are mainly adopted to reproduce complex and nonlinear phenomena of highly viscous fluids. In this study, the fully implicit Incompressible Smoothed Particle Hydrodynamics (ISPH) model was developed to analyze highly viscous fluids, and the model was verified by comparing with the analytic solutions of Poiseuille flow and the experimental data of dam break. The proposed model can overcome the limitation of the large computational time interval that inevitably occur in the analysis of highly viscous fluids, so that it is expected that the model will be widely applicable to practical industries.
ISPH-CGDEM을 활용한 제트류에 의한 3차원 세굴 수치해석
김지환(Jihwan Kim),신동빈(Dongbin Shin),변제윤(Jeyun Byun),주영석(Young Seok Joo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Scour by jet flow is one of the common characteristics between fluid and solid particles in many study fields such as mechanical, civil, and environmental engineering, etc. In this study, Incompressible Smoothed Particle Hydrodynamics (ISPH) was employed to simulate fluid motions and overcome the weaknesses of WCSPH (Weakly-Compressible Smoothed Particles Hydrodynamics). Coarse-grained Discrete Element Method (CGDEM) was used to simulate soil particles and reduce computational time using larger particle sizes for the simulations than the experiments. The interaction between fluid and solid particles was computed with the fluid porosity. The simulation result was reasonably validated with the experiment results in terms of scour depth and length in time. Furthermore, the CGDEM showed a significant reduction in computational time cost. Thus, the developed model improved the applicability of large-scale simulations.
Multi-GPU 기반 SPH에 대한 동적 부하분산 전략
김기덕(Gi-Deok Kim),이완기(Wan-Ki Lee),변제윤(Je-Yun Byun),주영석(Young-Seok Joo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Graphics processing unit(GPU) has been developed as much research has been conducted on smoothed particle hydrodynamics(SPH). Therefore, many researchers developed a variety of particle methods based on GPU as well as studies on multi-GPU instead of single-GPU are conducted. One of most widely adopted load balancing algorithms is the fixed analysis area division. The fixed region load balancing algorithm has the advantage that the implementation of load balancing is not complicated, since the particle distribution is not necessary to be considered. However, in the case of a dynamic flow analysis as dam-break, there is a drawback that particles are not distributed evenly into each device. To solve this issue, this paper presents a breakthrough that allocates the number of particles evenly to each GPU. Thus, it can be stated that the proposed load balancing algorithm has a higher applicability than the fixed analysis area division algorithms.