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김영태,김대희,황성민,김성진,윤희권,Kim, Youngtae,Kim, Deahee,Hwang, Sungmin,Kim, Sungjin,Yoon, Heekeon 항공우주시스템공학회 2009 항공우주시스템공학회지 Vol.3 No.1
This study is on the establishment process of Certification Plan of KPP small aircraft development, domestic BASA(Bilateral Aviation Safety Agreement) shadow certification project. For the development of certification plan incorporations process understanding applicable regulations, selection of certification basis, definition of means of compliance and establishment of compliance checklist. On the basis of this process, we develop type certification procedure suitable for domestic small aircraft.
폐기물 매립지의 복토재로 엔지니어드스톤 슬러지의 활용에 관한 연구
김영태,안광국,강홍식,Kim, Youngtae,Ahn, Kwangkuk,Kang, Hongsig 한국지반환경공학회 2022 한국지반환경공학회논문집 Vol.23 No.7
The industrial waste is becoming a big problem in the aspect of spatial and environmental in domestic and international. Therefore, the waste reduction and recycling policy has been being implemented as a way to solve this problem. The engineered stone sludge, which is waste, is generated duing the engineered stone production process. since engineered stone sludge is mostly treated by landfill, an increase in the amount of the sludge leads to an increase in landfill sites and treatment costs. therefore, there is a need for a method of resourcization with engineered stone sludge. So, laboratory tests (Plastic and liquid limits, compaction, unconfined compression and permeability test) were conducted to confirm the possibility of using engineered stone sludge mixed with weathered granite soil as a cover material for landfill in this study. The result shows that the mixed soil material with less that 62.5% of engineered stone sludge can be used as a cover material for landfill.
High Performance Computing Classes (HPCC) for Parallel Fortran Programs using Message Passing
김영태(Youngtae Kim) 한국정보과학회 2011 정보과학회논문지 : 시스템 및 이론 Vol.38 No.2
HPCC (High Performance Computing Class)는 Fortran90으로 구현된 객체지향형 클래스로서 FDM (Finite Difference Method) 모델 프로그램을 메시지 전송 방식을 사용하는 병렬 프로그램으로의 구현을 지원한다. HPCC는 병렬프로그램에서 메시지 전송 방식의 사용을 단순화하고, HPCC에 의해 정의 된 객체는 실행 시간에 병렬처리에 관련된 데이터와 관련 메소드를 제공한다. 또한 HPCC는 순차프로그램의 인덱스 전환을 위하여 매크로를 제공한다. HPCC를 사용하여 병렬화를 할 경우에는 병렬화 기간이 현격히 단축될 수 있으며, 메시지 전송을 직접 사용하는 것보다 효율적인 성능을 보인다. HPCC의 유용성과 성능을 알아보기 위하여 Fortran으로 구현된 3개의 레거시 모델 코드를 병렬화하였으며 PC 클러스터를 사용하여 성능의 효율성을 알아보았다. High Performance Computing Classes (HPCC) is a group of portable object-oriented classes designed with following objectives: (1) to simply the parallelizing process of the Fortran programs based on the FDM (Finite Difference Method) model and (2) to enhance performance of the parallel programs. The objects defined by HPCC provide the parallel programs with the information and the methods required for parallel processing at run-time. HPCC also provides the macros for the index transformation of the sequential programs. To show usefulness and efficiency of HPCC, three different legacy FDM models were parallelized with HPCC, and performance results were presented on a cluster of PC's.
생체모방 의료용 마이크로시스템의 마찰 메커니즘에 대한 연구
김영태(YoungTae Kim),김대은(DaeEun Kim),박석호(SukHo Park) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.11
In order to develop a self-propelled medical microrobot to move by its feet inside the small intestine, frictional mechanisms between the small intestine wall and the foot of the robot must be understood. In this paper biomimetic approach was considered to design the surface of the foot to achieve the desired frictional interaction. The concept of the design was derived from the hookworms that live inside the small intestine. They have teeth that adhere to the small intestine wall by interlocking with villi on the surface of the small intestine. The interlocking mechanism was considered as the main frictional mechanism for the design of the microrobot foot surface. The cylinder shaped foot specimens were designed and tested to understand the frictional mechanism. Experiments were performed with various diameter solid and hollow cylinders and the effects of contact area, interlocking, and contact pressure were investigated.
김영태(Youngtae Kim),김대은(Daeeun Kim) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
With the advent of various medical devices such as endoscope robot and surgical robot surface interaction between the medical device and human tissue has been of great concern in recent years. The issue is to maintain adequate contact between the two surfaces while assuring no significant damage to the tissue. In this work, three different multi-fiber foot specimens were designed and tested for effective friction generation with minimum surface damage of Ole organ surface. From the results it was found a multi-fiber foot which has a circular arrangement of the fibers showed the highest friction force. The results of this work will aid in the design of frictional surfaces for various medical applications.
도시기상모델 CFD_NIMR의 GP-GPU 실행을 위한 병렬 프로그램의 구현
김영태 ( Youngtae Kim ),박혜자 ( Hyeja Park ),최영진 ( Young-jeen Choi ) 한국인터넷정보학회 2014 인터넷정보학회논문지 Vol.15 No.2
본 논문은 도시기상모델인 전산유체역학모델(CFD_NIMR)을 GP-GPU에서 실행시키기 위해 CUDA Fortran 병렬프로그램을 구현하였다. GP-GPU는 원래 PCI 카드 형태의 그래픽 처리 장치이지만 저비용, 저전력으로 대량의 계산을 초고속으로 수행할 수 있는 일반 계산 가속기이다. 모델을 단일 Intel XEON 2.0 GHz CPU에서 실행한 결과와 Nvidia Tesla C1060 GPU에서 실행한 성능을 비교하였을 때 GP-GPU에서 15배 정도의 빠른 속도를 보였다. 또한 다중 CPU를 사용한 MPI 병렬프로그램과 비교한 경우에도 GP-GPU에서 보다 더 효율적인 성능을 보였다. 본 논문에서 제시한 프로그램 방식은 유사한 구조를 가진 수치모델을 GP-GPU 병렬 프로그램으로 구현 하는데 쉽게 적용할 수 있을 것으로 기대한다. In this paper, we implemented a CUDA Fortran parallel program to run the CFD_NIMR model on GP-GPU`s, which simulates air diffusion on urban terrains. A GP-GPU is graphic processing unit in the form of a PCI card, and a general calculation accelerator to perform a large amount of high speed calculations with low cost and electric power. The GP-GPU gives performance enhancement of speed by 15 times to compare the Nvidia Tesla C1060 GPU with Intel XEON 2.0 GHz CPU. In addition, the program on a GP-GPU shows efficient performance compared to an MPI parallel program on multiple CPU`s. It is expected that a proposed programming method on the GP-GPU parallel program can be used for numerical models with a similar structure.