• Review of KIISC
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• v.1 no.2
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• pp.86-101
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• 1991

• TTA REPORT
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• v.4 no.2 s.12
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• pp.47-53
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• 1992

• 발명특허
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• v.10 no.3 s.109
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• pp.58-59
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• 1985

• Journal of Advanced Navigation Technology
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• v.21 no.1
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• pp.78-83
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• 2017

Linux was born under the influence of Unix except for the kernel, Linux was used to bring the Unix system and relevant program package, commands, etc. However, the latest version of Enterprise Linux, RHEL 7 was adopted systemd instead of init to boot program and management services. The adoption of systemd was building its own Linux system, the system only. Also noteworthy point is that given the considerable number of features specific to a particular package and instructions. As Linux has been recognized as a subtype of Unix itself as a catch all this time the turn of the tide in the cloud era and there on their own to try various changes, the start of the adoption of these changes can be called systemd. Linux is the future beyond the confines of Unix is noteworthy not attempt any changes.

• The Transactions of the Korea Information Processing Society
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• v.3 no.3
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• pp.617-630
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• 1996

In this paper, a shared-concurrent file system (S-CFS) is designed and implemented using conventional disks as disk arrays on a Workstation Cluster which can be used as a small-scale server. Since it is implemented on UNIX operating systems, S_CFS is not only portable and flexible but also efficient in resource usage because it does not require additional I/O nodes. The result of the research shows that on small-scale systems with enough disks, the performance of the concurrent file system on transaction processing applications is bounded by the bottleneck of CPUs computing powers while the performance of the concurrent file system on massive data I/Os is bounded by the time required to copy data between buffers. The concurrent file system,which has been implemented on a Workstation Cluster with 8 disks,shows a throughput of 388 tps in case of transaction processing applications and can provide the bandwidth of 15.8 Mbytes/sec in case of massive data processing applications. Moreover,the concurrent file system has been dsigned to enhance the throughput of applications requirring high performance I/O by controlling the paralleism of the concurrent file system on user's side.

• The Transactions of the Korea Information Processing Society
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• v.1 no.3
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• pp.367-379
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• 1994

This paper describes scheduling algorithms of the UNIX operating system and shows an analytical approach to approximate the average conditional response time for a process in the UNIX operating system. The average conditional response time is the average time between the submittal of a process requiring a certain amount of the CPU time and the completion of the process. The process scheduling algorithms in thr UNIX system are based on the priority service disciplines. That is, the behavior of a process is governed by the UNIX process schuduling algorithms that (ⅰ) the time-shared computer usage is obtained by allotting each request a quantum until it completes its required CPU time, (ⅱ) the nonpreemptive switching in system mode and the preemptive switching in user mode are applied to determine the quantum, (ⅲ) the first-come-first-serve discipline is applied within the same priority level, and (ⅳ) after completing an allotted quantum the process is placed at the end of either the runnable queue corresponding to its priority or the disk queue where it sleeps. These process scheduling algorithms create the round-robin effect in user mode. Using the round-robin effect and the preemptive switching, we approximate a process delay in user mode. Using the nonpreemptive switching, we approximate a process delay in system mode. We also consider a process delay due to the disk input and output operations. The average conditional response time is then obtained by approximating the total process delay. The results show an excellent response time for the processes requiring system time at the expense of the processes requiring user time.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.254-258
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• 2008

본 연구는 격자기반 운동파 강우유출모형 KIMSTORM(grid-based KIneMatic wave STOrm Runoff Model)의 기능을 개선하고 적용성을 평가하는 것이다. KIMSTORM은 김성준(1998)이 개발한 분포형 강우유출모형으로 포화상태의 지표흐름 및 토양수분상태의 시공간적인 분포를 파악할 수 있다. UNIX C++ 언어로 개발되었으며, GRASS 형태의 ASCII Grid를 입출력하도록 구성되어 있는 모형으로 UNIX 운영체제에서 구동이 가능하다. 그러나 UNIX와 GRASS는 최근에 많이 이용되지 않는 추세로 KIMSTORM 모형을 이용한 홍수유출해석이 적극적으로 활용되는데 주요 제약사항이 되어 왔다. 본 연구에서는 KIMSTORM을 윈도우즈 환경에서 운영될 수 있도록 FORTRAN 90을 이용하여 재개발하였으며 주요개선 사항으로, ESRI ASCII Grid 형태의 GIS(geographic information system) 자료 입력, 물리적 침투모의 방법인 GAML (Green-Ampt and Mein- Larson) 적용, 공간강우 입력가능, 정렬 알고리즘을 이용한 계산속도의 개선, 모형 자료입력 등 전처리 기능개선, 계산결과의 자동평가 및 분포도출력 등 후처리 방식개선으로 요약할 수 있다. 개선된 모형 GAML에 의한 침투방법을 적용하여, 남강댐유역($2,293\;km^2$)의 6개 강우사상을 대상으로 결정계수, Nash & Sutcliffe 모형효율계수, 용적편차, 첨두유량의 상대오차, 첨두시간의 절대오차를 이용하여 적용성을 평가하였으며, 민감도분석결과 초기토양수분조건과 하천조도계수가 가장 큰 민감도를 나타내었다.

• Journal of Internet Computing and Services
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• v.2 no.4
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• pp.25-32
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• 2001

The CAD tools for ASIC design, which are already developed or will be developed in the future, have their own functions and different working environments in many cases. Therefore, it would be more effective in achieving the final design goal, if we have a system called CAD framework in which these CAD tools are systematically integrated. In this paper, we introduce same novel techniques for integrating systematically such the CAD tools, which are usually developed under UNIX shell environments, into the CAD framework with the standard graphics interface such as X-windows. Some meta languages and script file formats are developed for flexible specification of the system MENU hierarchy and the data dependencies among executable programs. We integrated two existing CAD tools into our CAD framework using the techniques and find out the integrated protype system is working well under the new system environments.

• 월간산업보건
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• s.89
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• pp.36-38
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• 1995

인터넷은 한마디로 "정보의 바다"라고 할 수 있다. 다른 방향에서 본다면 인터넷이란 하나의 거대한 도서관이라고도 할 수 있다. 도서관에서는 각 정보를 색인화하여 쉽게 정보를 찾아 볼수 있게 되어 있고 새로운 정보가 나오면 추가로 색인을 재 정리하는 시스템으로 되어 있다. 인터넷도 도서관의 색인 시스템과 마ㅏㄴ가지로 전세계의 전산망 특히 산업보건과 관련된 기관에 접속하여 키보드로 산업보건정보를 찾을수 있게 되어 있다. 그렇다면 우리가 어떻게 전세계에 산재되어 있는 대형, 소형, IBM, 매킨토시 컴퓨터의 전산망에 접근하여 정보를 찾아 낼 수 있는가? 하고 의문을 갖는 사람들이 있을 것이다. 인터넷이 바로 그것을 가능하게 해준다. 그러면 어떻게 인터넷에 접근을 할 수 있는가? 많은 대학의 전산망, 교육망, 연구망을 통해 인터넷에 연결되어 있고 여러가지 상업서비스도 생겨나서 인터넷접속이 얼마든지 가능하다. 그러나 여기에는 또 한가지의 문제가 있다. 인터넷은 UNIX 운영시스템으로 구성되어 있기 때문에 약간의 UNIX언어를 알아야 인터넷 접근이 가능하다는 것이다. 이런한 문제 때문에 일반인들은 인터넷의 접근을 회피하게 된다. 그러나 이러한 단점은 World Wide Web(WWW)와 Web browser라는 프로그램이 나오면서 해결되었고 요즈음 일반적으로 많이 사용하고 있는browser는 Mosaic과 Netscape라는 프로그램이다. Netscape은 UNIX운영시스템이 탑재된 work station이나 대형컴퓨터에 보다 많이 이용되고 일반 개인용컴퓨터 사용자는 Mosaic 프로그램 버그(bug)가 적기 때문에 주로 사용하고 있다. Netscape도 사용법에 있어서는 Mosaic과 별 차이가 없다. 필자는 Netscape보다는 Mosaic을 주로 사용해 왔기 때문에 Mosaic을 이용하여 인터넷에 접근하는 방법과 필자가 접속해 본 미국의 산업보건관련 기관을 소개하고자 한다.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.53 no.2
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• pp.89-93
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• 2004

Supervisory Control And Data Acquisition(SCADA) of electric power system refersto the system that displays, monitors and executes the control commands for remote electric power system. KNR's existing electric power control system is built on UNIX platform such that it costs more for system construction, and people with UNIX skills can only be an operator who controls and manages the system. Moreover, since the system is mainly operated in local offices, system operators must communicate with local operators to investigate the cause of the accident and react the accident every time the system fails. As a new integrated SCADA system is constructed, establishment of small-unit electric power control system, that alters local electric power control system in designated stations, is required. In this study, the electric power control system, which accommodates all functions of UNIX-based SCADA system and facilitates operation and even maintenance for local operators, is to be developed. In order to develop small-unit electric power control system, the industrial automation program, "Cimon", is used. The small-unit electric power control system that accommodatesRTU and newly installed electronic switchboard is being developed and tested at Chulam station of KNR.