• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.532-543
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• 2004

The present work have been developed the interpretation processor including the behavior of material failure and the separation phenomena under transient dynamic loading (the operation of explosive bolt) using AUTODYN V4.3, SoildWork 2003 and TrueGrid V2.1 programs. It has been demonstrated that the interpretation in ridge-cut explosive bolt under dynamic loading condition should be necessary to the appropriate failure model and the basic stress of bolt failure is the principal stress. The use of this interpretation processor developing the present work could be extensively helped to design the shape and the amount of explosives in the explosive bolt having a complex geometry. It is also proved that the interpretation processor approach is an accurate and effective analysis technique to evaluate the separation mechanism in explosive bolts.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1991년도 춘계학술대회 논문집
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• pp.243-250
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• 1991

This paper concerns the development of NC programming system TIG (Turning with Interactive Graphics) with interactive graphics for turning operation. The system cosists of the processor, the post-processor and the system-user interface. Different from previous segment contour based NC graphic programming systems, the frliability and efficiencyof programming is realized by using Boolean operation with block unit based ICONs for the geometry definition. The tool motion can be also displayed on the screen together with the part contour. The system calculate automatically the number of passes based on the user specified cutting conditions.

• 한국정보과학회논문지:시스템및이론
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• 제31권1_2호
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• pp.135-143
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• 2004

3차원 그래픽 가속기는 지오메트리 처리(geometry processing)와 레스터라이져(rasterizer)로 구성된다. 본 논문에서는 지오메트리 처리를 고속으로 수행할 수 있는 벡터 형태의 처리 구조(VGE)를 제안하였다. 특히 기존의 부동소수점을 계산할 수 있는 구조에 4개의 FADD, FMUL, 128개의 벡터 레지스터를 추가하여 지오메트리 연산을 가속했으며 VGE와 비슷한 H/W 비용을 갖는 Hitachi의 SH4와 비교했을 때 평균 4.7배의 성능향상을 보였다. 또한 성능 평가를 위해 범용프로세서 시뮬레이터인 Simplescalar 를 수정하여 시뮬레이터를 제작했으며 Viewperf Benchmark를 입력으로 사용하였다.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2004년도 추계 학술대회논문집
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• pp.53-59
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• 2004

A general purpose program NUFLEX for the analysis of 3-D heat/fluid flow in complex geometry with pre/post processor have been developed, which consists of a flow solver based on FVM and a dedicated pre/post processor. The program employs a general non-orthogonal grid system and solve laminar and turbulent (lows with standard and RNG $\kappa-\epsilon$ turbulence models. NUFLEX is capable of analysing two-phase flow with topologically complex interface, turbulent diffusion combustion, solidification problems and magnetic flow. For the purpose of verification of the program and testing the applicability, several practical problems are solved and compared with the available data. Comparison of the NUFLEX results with that by the STAR-CD program has been also made for the same flow configuration and grid structure.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2007년도 춘계 학술대회논문집
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• pp.91-94
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• 2007

A GUI based pre/post processor program, which is based on the MFC and OpenGL library in the Windows O/S, hee been developed for NUFLEX Using this program, users are able to generate and modify structured or unstructured grid geometries, set all the parameters for the solver, and observe the results of the simulation in graphic view by vector or scalar plots. The mesh geometry data can be imported from or exported to other programs by supporting functions for reading from and writing to CGNS data format files.

• 전자공학회논문지A
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• 제30A권3호
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• pp.114-129
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• 1993

A FFT array processor algorithm and architecture which anc use a minumum required number of simple, duplicate multiplier-adder processing elements according to various computation speed, will be presented. It is based on the p fold symmetry in the radix p constant geometry FFT butterfly stage with shuffled inputs and normally ordered outputs. Also, a methodology to implement a high performance high radix FFT with VLSI by constructing a high radix processing element with the duplications of a simple lower radix processing element will be discussed. Various performances and the trade-off between computation speed and hardware complexity will be evaluated and compared. Bases on the presented architecture, a radix 2, 8 point FFT processing element chip has been designed and it structure and the results will be discusses.

• 대한조선학회논문집
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• 제41권2호
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• pp.114-120
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• 2004

Propeller blades have complex airfoil section type geometry and the thickness is continuously varied to both its length and cord-wise direction. in the present research, the finite element analysis program PROSTEC (Propeller Stress Evaluation Code) is developed to calculate the structural responses of propeller blades in irregular ship wake field. To represent the curved and skewed geometry of propeller blades accurately, 20-node curved solid element using the quadratic shape function is adopted. Input data for the analysis including the geometry and pressure distribution of propeller blades can be generated automatically from the propeller design program. And to visualize the results of analysis on windows system conveniently, the post processor PROSTEC-POST is developed.

• 한국전산유체공학회지
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• 제12권2호
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• pp.8-13
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• 2007

A general purpose program NUFLEX for the analysis 3-D thermo/fluid flow and pre/post processor in complex geometry has been developed, which consists of a flow solver based on FVM and GUI based pre/post processor. The solver employs a general non-orthogonal grid system with structured grid and solves laminar and turbulent flows with standard/RNG $k-{\varepsilon}$ turbulence model. In addition, NUFLEX is incorporated with various physical models, such as interfacial tracking, cavitation, MHD, melting/solidification and spray models. For the purpose of evaluation of the program and testing the applicability, many actual problems are solved and compared with the available data. Comparison of the results with that by STAR-CD or FLUENT program has been also made for the same flow configuration and grid structure to test the validity of NUFLEX.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2007년도 춘계 학술대회논문집
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• pp.87-90
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• 2007

A general purpose program NUFLEX for the analysis 3-D thermo/fluid flow and pre/post processor in complex geometry has been developed, which consists of a flow solver based on FVM and GUI based pre/post processor. The solver employs a general non-orthogonal grid system with structured grid and solves laminar and turbulent flows with standard/RNG ${\kappa}-{\varepsilon}\;SST$ turbulence model. In addition, NUFLEX is incorporated with various physical models, such as interfacial tracking, cavitation, MHD, melting/solidification and spray model. For the purpose of verification of the program and testing the applicability, many actual problems are solved and compared with the available data. Comparison of the results with that by STAR-CD or FLUENT program has been also made for the same flow configuration and grid structure to test the validity of NUFLEX.

• 대한전자공학회논문지SD
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• 제44권10호
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• pp.23-32
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• 2007

본 논문에서는 3D 그래픽스(graphics), H.264/H.263/MPEG-4 같은 동영상 코덱, JPEG 혹은 JPEG2000 같은 정지영상 코덱, MP3 같은 오디오 코덱 등 다양한 멀티미디어 관련 기술을 효율적으로 구현하기 위한 재구성형 병렬 프로세서 구조가 제안된다. 제안된 구조는 메모리와 프로세서를 직접 연결하여 메모리 접근 시간과 소비전력를 감소시키고, 3D 그래픽스 처리 과정중 기하 단계의 부동소수점 연산을 지원한다. 또한 분할 SIMD(partitioned SIMD) 방식을 사용하여 하드웨어 비용을 줄이고, 명령어(instruction)의 조건부 실행(conditional execution)을 지원하여 알고리듬 개발이 용이하다.