• Journal of Radiation Protection and Research
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• v.28 no.3
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• pp.255-261
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• 2003

An environmental radiation monitoring system based on high pressurized ionization chamber has been used for on-line gamma monitoring surrounding the KAERI (Korea Atomic Energy Research Institute), which transmits the dose data measured from ion chamber on the site via radio frequency to a central processing computer and stores the transmitted real-time data. Although communication using radio frequency has several advantages such as effective and economical transmission, storage, and data process, there is one main disadvantage that data loss during transmission often happens because of unexpected communication problems. It is possible to restore the loss data by off-line such as floppy disk but the simultaneous process and display of current data as well as the backup data are very difficult in the present on-line system. In this work, a new electronic circuit board and the operation software applicable to the conventional environmental radiation monitoring system are developed and the automatical synchronization of the ion chamber unit and the central processing computer is carried out every day. This system is automatically able to restore the backup data within 34 hours without additional equipments and also display together the current data as well as the transmitted backup data after checking time flag.

• Journal of Korea Society of Industrial Information Systems
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• v.12 no.3
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• pp.104-115
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• 2007

As soon as an intrusion is detected by kernel backdoor, the proposed method can be preserve secure and trustworthy evidence even in a damaged system. As an experimental tool, we implement a backup and analysis system, which can be response quickly, to minimize the damages. In this paper, we propose a method, which can restore the deleted log file and analyze the image of a hard disk, to be able to expose the location of a intruder.

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.79-82
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• 2002

The addition of switches to a distribution feeder does, in general, increase reliability by decreasing the duration of the outage of many to the customers on the feeder. To cover its service area so that feeder-level delivery reaches sufficiently close to all customers, feeders typically split their routes many times, in what is often called a lateral feeder. It is interesting to note, however, that the effectiveness of a switch is very much dependent on the types of lateral feeder. The types of lateral are classified into two types. The first is loop lateral feeder that can connect its load to an adjacent feeder through a tie line in case that a fault occurs in its feeder and it is laid out so that every feeder has complete fault backup through re-switching of its loads to other sources like a main feeder. The second is the radial lateral feeder cannot connect its load to an adjacent line, no provision is made for contingency backup of feeders. There are no other circuits in the radial lateral feeder form which to restore power. In this study, we evaluate the effectiveness of a switch installation between on the radial and loop lateral feeders to increase reliability by decreasing the duration of the outage. These results can help power utility to design the switch layouts on the radial and loop lateral feeder system.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.653-656
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• 2002

본 연구는 데이터웨어하우징/의사결정시스템, 그리고 업무 처리 자동화 소류션등 새로운 애플리케이션 개발로 이하여 발생하는 엄청난 양의 데이터를 효율적으로 관리하기 위한 백업 서장 시스템을 SAN 환경을 지원하는 SANtopia 파일시스템에서 동작하도록 설계 구현하였다. 지금까지 데이터 저장시스템은 하나의 서버에 접속되어 있어서 네트워크 상의 다른 컴퓨터가 직접 활용하는 것을 허용하지 않기 때문에 기존의 네트웍을 기반으로 하는 파일서버 형태로는 이러한 대용량의 자료를 저장하고 관리하는데 한계가 있다. 이러한 문제를 해결할 수 있는 방법으로 Fibre Channel과 LAN 네트워크 모델을 결합하여 대역폭(Bandwidth)의 병목 현상을 크게 완화할 수 있는 SCSI 명령어를 이용하여 SANtopia 파일 시스템에서 파티션별 Full backup과 Restore 할 수 있는 시스템을 리눅스 기반에서 구현하였다.

• Journal of KIISE:Information Networking
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• v.27 no.2
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• pp.187-196
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• 2000

Failures in ATM networks can occur at virtual path (VP) links, virtual path switches, and virtual channel (VC) switches. Restoration schemes have been proposed for VP link and VP switch failures, however, none for VC switch failures. In general, VC switches are used for edge nodes in protection domains. Since even only one VC switch failure can cause a critical problem, new restoration schemes for VC switch failures are highly required. Restoration schemes at the VP level proposed so far can be categorized into those using the flooding algorithm and those using the backup virtual path (BVP) concept. Even though the latter cannot handle unpredictable failures, it has some advantages such as fast restoration and low spare capacity requirement. In this paper, we propose new restoration schemes using a new type of BVPs to handle VC switch failures. The simulation results show that the proposed schemes can restore virtual connection failures due to VC switch failures without degrading restorability for VP failures.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.188-194
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• 2011

The purpose of this paper is to explain the implementation method in order to enhance stability and reliability of embedded system. In this research, Texas Instrument (TI)'s TMS570 MCU(Micro Controller Unit) is used to satisfy the standard of stability that is IEC 61508. IEC 61508 suggest SIL(Safety Integrity Level) from 1 to 4 and TMS570 is satisfied SIL3. Also, TMS570 can provide several stability functions can be used in realtime system. To use such functions, this paper suggest the solution about the defect that can be used in realtime system. In basic way TMR(Triple Modular Redundancy) suggested in addition to explain about the way to improve safety and reliability. Also this paper will suggest the method that reinforce the stability of calculation by using multiplex voter and memory.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.10B
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• pp.841-848
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• 2004

In case of failure in the IP network services should be provided via a backup path which fully meets QoS requirements. In this regard, we in this paper suggest simple-PFC(5-PFC) to restore single link failure, iterative-PFC(i-PFC) for multiple link failures, and fault_node Avoidance-PFC(a-PFC) for failures of nodes such as routers. Taking the minimum cost rerouting problem into account, we compare and analyze performance of those three mechanisms carrying out Direct_destination Rerouting(DR).

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.9B
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• pp.791-798
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• 2004

In case of failure in the IP network, services should be provided via a backup path which fully meets QoS requirements. In this regard, we in this paper suggest simple-PFC(s-PFC) to restore single link failure, iterative-PFC(i-PFC) for multiple link failures, and fault_node Avoidance-PFC(a-PFC) for failures of nodes such as routers. Taking the minimum cost rerouting problem into account, we compare and analyze performance of those three mechanisms carrying out Direct-destination Rerouting(DR).

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.187-189
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• 2003

This paper presents new service restoration algorithm to deal with multiple faults such as main transformer fault, whole substation fault and simultaneous faults. The most important consideration of restoration planning for multiple outage areas is efficient use of redundant backup feeders. The proposed algorithm tries to restore all outage loads using outage area ordering method and tie switch exchange method that are newly proposed in this paper.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.60-63
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• 2012

최근 스마트폰 시장에서 제품 수명주기가 계속 짧아지고 있다. 소비자는 항상 최신의 스마트폰을 원하고 있고, 그로 인해 스마트폰 교체시기가 점점 짧아지는 추세이다. 그러나 스마트폰의 교체시 저장되어 있는 개인적인 자료의 백업 및 복원은 필수적이다. 본 논문에서는 소프트웨어적 지식이 없는 소비자들이 안드로이드 시스템에서 터치 몇 번으로 쉽고 간편하게 주소록이나 SMS 메시지 등의 자료를 저장하고 백업할 수 있는 시스템의 개발에 대해서 설명한다. 본 시스템을 이용하면 일반 소비자들이 필요한 자료를 저장하고 백업을 할 수 있어 시간을 절약하고 불필요한 노력을 줄일 수 있을 것으로 기대한다.