• Journal of the Korea Society for Simulation
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• v.7 no.1
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• pp.69-83
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• 1998

In this paper, we present the results of simulation by running parallel VHDL simulation on typical MPP(Massively Parallel Processor) systems such as IBM SP2 and SGI Origin 2000. Parallel simulation uses the synchronous protocol and parallel program is implemented using MPI(Message Passing Interface) based on message passing model, so that it can urn on any parallel programming environment which supports MPI, a standard communication library. And then GVT(Global Virtual Time) computation for parallel simulation is based on the global broadcasting with MPI＿Bcast(), which is a standard function in MPI and piggybacking. Our benchmark exhibits that as size of VHDL grows, the parallel simulation has a better performance compared with the sequential simulation. In addition, we also show the results of comparison between IBM SP2 and SGI Origin 2000 by applying the same application to those indirectly.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1681-1683
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• 2010

시스템의 한정된 자원을 다수의 사용자들이 프로그램을 실행 시 자원을 효율적으로 배분하기 위하여 작업관리 시스템을 사용한다. 이러한 작업관리 시스템은 여러가지 종류가 있으며 사용하는 시스템의 환경과 작업의 특성에 따라 적당한 작업관리 시스템을 선택하여 사용한다. IBM 시스템은 자체로 제공하는 작업관리 시스템으로서 LoadLeveler를 사용하고 있는데, 이러한 LoadLeveler에서의 클래스를 설계하여 작업의 처리 효율을 높혔으며 계정별 작업 우선순위를 부여하여 사용자게 선택의 폭을 넓히고 최적 환경을 구성하였다. 작업관리 시스템의 주요한 시스템 환경변수는 CPU와 메모리이고, 작업환경 변수는 작업 실행시간이다. 따라서 KISTI IBM 시스템에서는 이러한 환경을 사용자의 배분정책에 맞게 설계하여 시스템의 안정성을 유지하고 사용자의 선택에 따라 전체 작업처리 효율을 증가하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1349-1351
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• 2011

다수의 사용자가 사용하는 시스템의 자원을 프로그램을 실행 시 한정된 자원을 효율적으로 배분하기 위하여 작업관리 시스템을 사용한다. 이러한 작업관리 시스템은 여러가지 종류가 있으며 사용하는 시스템의 환경과 작업의 특성에 따라 적당한 작업관리 시스템을 선택하여 사용한다. IBM 시스템은 자체로 제공하는 작업관리 시스템으로서 LoadLeveler를 사용하고 있는데, 멀티 노드 시스템에서 이러한 LoadLeveler에서의 클래스를 구분하여 시스템의 이용 효율을 높이고 사용자게 다양한 선택의 폭을 가질 수 있게 최적 환경을 구성하였다. 작업관리 시스템의 주요한 환경변수는 CPU와 메모리 그리고 작업 실행시간이다, 이러한 작업환경 변수에 따라 클래스의 종류를 구분하여 KISTI IBM의 1, 2차 시스템에서 이러한 환경을 사용자의 이용률과 배분정책에 따라 알맞게 설계하여 시스템의 전체 작업처리 효율을 증가하였다.

• 정보화사회
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• s.48
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• pp.54-55
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• 1991

지난 7월 세계 컴퓨터산업계에 충격을 던져준 IBM과 애플컴퓨터의 업무제휴 발표 이후, 그 구체적 제휴내용이 밝혀지면서 앞으로 업계의 세력판도가 크게 바뀔 것이라는 예측이 나오고 있다.

• ETRI Journal
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• v.8 no.1
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• pp.16-24
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• 1986

본고에서는 network controller인 82588을 이용한 EENET interface board로 IBM PC간의 LAN(Local Area Network)을 구성하고, 각 PC들간의 자원공유와 메세지 전송을 위한 network support programs의 개발에 관하여 기술한다.

• the USERS
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• s.45
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• pp.54-55
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• 2005

'IBM"과 '레노버'의 장기적 전략적 제휴내용을 살펴보면, '새로운 레노버'가 양사의 부족한 점을 보완하여 강력한 브랜드 인지도를 갖춘 글로벌 PC리더로서, 제품과 고객을 모두 갖춘 균형 잡힌 포트폴리오로 시너지를 창출할 수 있는 'Win-Win' 전략을 기조로 제휴하게 되었음을 알 수 있다.

• Journal of the Korean Institute of Telematics and Electronics T
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• v.36T no.4
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• pp.115-122
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• 1999

The Y2K bug, what is called "millennium bug" or "2000 year bug", take place because the year after 2000 year is not recognize as the year marking method of the computer designed for take up two-digit number. This takes place because the RTC chip architecture of PC can not change the century information to the operating together with date. In this paper, we make an analysis about Y2K hardware bug of RTC in the IBM compatible PC, and make a Y2K compensation board in order to solve Y2K hardware bug. And the test results by various Y2K diagnosis program is bug before put in Y2K compensation board, but is not bug after put in Y2K compensation board. Therefore, we suggest a solution method for Y2K hardware bug of RTC in the IBM compatible PC.

• Journal of the Society of Naval Architects of Korea
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• v.51 no.5
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• pp.409-418
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• 2014

Simulation of flow past a complex marine structure requires a fine resolution in the vicinity of the structure, whereas a coarse resolution is enough far away from it. Therefore, a lot of grid cells may be wasted, when a simple Cartesian grid system is used for an Immersed Boundary Method (IBM). To alleviate this problems while maintaining the Cartesian frame work, we adopted an Adaptive Mesh Refinement (AMR) scheme where the grid system dynamically and locally refines as needed. In this study, We implemented a moving IBM and an AMR technique in our basic 3D incompressible Navier-Stokes solver. A Volume Of Fluid (VOF) method was used to effectively treat the free surface, and a recently developed Lagrangian Dynamic Subgrid-scale Model (LDSM) was incorporated in the code for accurate turbulence modeling. To capture vortex induced vibration accurately, the equation for the structure movement and the governing equations for fluid flow were solved at the same time implicitly. Also, We have developed an interface by using AutoLISP, which can properly distribute marker particles for IBM, compute the geometrical information of the object, and transfer it to the solver for the main simulation. To verify our numerical methodology, our results were compared with other authors' numerical and experimental results for the benchmark problems, revealing excellent agreement. Using the verified code, we investigated the following cases. (1) simulating flow around a floating sphere. (2) simulating flow past a marine structure.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.4
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• pp.411-422
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• 2002

Recently, there have been active researches about the VPCS (Virtual Parallel Computing System) based on multiple agents. The PVCS uses personal computers or workstations that are dispersed all over the internet, rather than a high-cost supercomputer, to solve complex problems that require a huge number of calculations. It can be made up with either homogeneous or heterogeneous computers, depending on resources available on the internet. In this paper, we propose a new method in order to distribute worker agents and work packages efficiently on the VPCS based on the IBM Aglets. The previous methods use mainly the master-slave pattern for distributing worker agents and work packages. However, in these methods the workload increases dramatically at the central master as the number of agents increases. As a solution to this problem, our method appoints worker agents to distribute worker agents and workload packages. The proposed method is evaluated in several ways on the VPCS, and its results are improved to be worthy of close attention as compared with the previous ones.

• Reproductive and Developmental Biology
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• v.32 no.1
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• pp.9-14
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• 2008

Efficient gene transfer into hematopoietic stem cells is a great tool for gene therapy of hematopoietic disease. Retrovirus have been extensively used for gene delivery and gene therapy. However, current in vitro gene transfer has some obstacles suck as induction of differentiation loss of self-renewal capacity, and down-regulation of homing efficiency for in vitro hematopoietic stem cells transplantation. To overcome these problems, we developed efficient in vitro retroviral transfer technique by direct intra-bone marrow injection (IBM). We identified effective retrovirus gene transfer in bone marrow hematopoietic cells in vitro. Two weeks after retrovirus transfer via IBM injection, we observed stable EGFP gene expression in bone marrow, lymph node, spleen, and liver cells. In addition, $6.4{\pm}2.7%$ of hematopoietic stem/progenitor cells were expressed EGFP transgene from flow cytometry analysis. Our results demonstrate that in vitro retrovirus gene transfer via IBM injection can provide a viable alternative to current or moo gene transfer approach.