• Journal of Energy Engineering
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• v.8 no.2
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• pp.213-223
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• 1999

In recently, the safety system software of the nuclear power plant has been verified and validated according to ANSI/IEEE-ANS-7-4.3.2-1982 to improve the reliability. This standard requires that safety-related software should be tested in the static and dynamic environments. In case of Inadequate Core Cooling Monitoring System (ICCMS), the static test procedure and related techniques are developed but the dynamic test procedure and related techniques are not developed. Therefore, this paper discusses the undeveloped techniques, and suggests the dynamic test procedure and the program for generation of test input data. The performance of the program was identified using accident analysis report of Ulchin 3&4 Final Safety Analysis Report (FSAR).

• Convergence Security Journal
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• v.6 no.3
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• pp.87-95
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• 2006

An intrusion can be defined as any set of actors that attempt to compromise the integrity, confidentiality and availability of computer resource and destroy the security policy of computer system. The Intrusion Detection System that detects the intrusion consists of data collection, data reduction, analysis and detection, and report and response. It is important for feature selection to detect the intrusion efficiently after collecting the large set of data of Intrusion Detection System. In this paper, the feature selection method using Genetic Algorithm and Decision Tree is proposed. Also the method is verified by the simulation with KDD data.

• Proceedings of the KIEE Conference
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• 2004.11b
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• pp.249-251
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• 2004

Harmonic resonant overvoltage during restoration of primary restorative transmission system originates in switching operations and nonlinear characteristics of equipments. Actually it is difficult to predict the occurrence of harmonic overvoltage, since they result from nonlinear characteristics of transformers and other equipments. This paper describes the analysis of domestic primary restorative transmission system using PSCAD/EMTDC. The harmonic resonance is verified and showed the relation with equipments which have nonlinear characteristics such as generator and transformer in this paper. And the solution to prevent harmonic resonance is proposed too. As a result, the PSCAD/EMTDC simulation showed slightly conflictive results that had been presented by IEEE Power System Restoration Working Group report.

• Aerospace Engineering and Technology
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• v.8 no.2
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• pp.41-53
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• 2009

This study describes to design the interface between VDL (VHF Digital Link) Mode 2 system and AOA (ACARS Over AVLC) network. KARI-Wrapper using aircraft and ground station design requirements should be designed to the system configuration of the in-out interface of the components and analyzed with the ARINC 618, 620, 622 documentations. According to the system interface test, we are verified the satisfactions of uplink and downlink VDL Mode 2 requirements.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.34 no.9A
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• pp.704-711
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• 2009

In this paper, we report the results of the field trial test of 1GbpsX16channels Injection locking FP-LD based WDM-PON system which could guarantee 40Mbps minimum bandwidth per subscriber, We have confirmed the system reliability, also verified that the system could reliably deliver the service such as internet, VoD through the systems during the field trial test.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.130-136
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• 1998

In the PANBOX 2 system an excore detector module simulating the excore signal responses during a short term transient is implemented in order to simulate the reaction of the flux detector and control system upon rapid power changes as it occurs e. g, in rod drop events. This module has been verified in the past by comparison calculations with the PANBOX 1 system. This report describes additional PANBOX 2 validation calculations which have bee compared with experiment data measured at german plant KKG, cycle 1, for a rod drop event. In general, the PANBOX 2 results are in very good agreement with the KKG experiments. Therefore it is concluded that the excore detector model of PANBOX 2 is successfully validated.

• Journal of Korean Neurosurgical Society
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• v.29 no.6
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• pp.805-809
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• 2000

Hemangioblastoma of the central nervous system rarely occurs in cervicomedullary junction. The unique pathologic features of the tumor involving midline structures are grossly solid in consistency and accompanying extensive spinal cord enlargement. A 63-year-old women presented with progressive right motor weakness and tingling sensation. The MR image showed a well enhancing mass having a cyst and diffuse cord enlargement in the cervicomedullary junction. A total surgical resection was performed and hemangioblastoma was histologicaly verified. Postoperative MR image showed the disappearance of cord enlargement. The right motor weakness was also improved. The authors report a rare case of hemangioblastoma in cervicomedullary junction and the pathophysiology of the spinal cord enlargement are discussed.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2008.10b
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• pp.96-103
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• 2008

The information systems audit is an proactive action to find out the predicted issues on proceeding the business beforehand, to make out whether the information systems satisfies the user's demand or not and to check up the result of the project with complementing the capabilities of self-diagnostics for the complicated and advanced information system. However, the results of the audited project are apt to be regarded as a failure in a case that an opinion of the audit area evaluation is described as 'insufficient' or 'negative' in the audit report that is submitted as the result of the audit. It makes a lot of arguments among the board of audit, the institution ordering the audit and the auditor. In this study, we made an attempt to finding out the factors affecting the audit area evaluation and verifying them objectively. A study model and hypothesis including the improvement type of the recommended subject to be improved, the importance, the audit time, the business scale of the audited object and the auditing company as a factor variable were established and the hypothesis was verified by analyzing the correlation between the factor variables and the audit area evaluation.

• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.510-512
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• 2005

This paper introduces the development of automatic system for estimation of digital relay performance. We have developed an automatic estimation system "HRV2004(Himap Relay function Verifier 2004)" for digital relay in 2004 and it has been verified in the field for one years. This paper describes the development details and field experience of HRV2004. HRV2004 can perform a series of jobs required for the relay testing in one environment and could handle most of all models of protective relay currently produced by Hyundai Heavy Industries. The functionality of this program consists of GUI of relay setting for beginner, fault record analysis and relay performance estimation. The core of this system is an automatic reporting of estimation test. If user is only click a button for relay estimation and one will received testing report to deliver customer. Additional benefit is fast response than the manual estimation. For example, the manual estimation takes spending 6 hours but this system is about 15 minutes.

• Special Issue of the Society of Naval Architects of Korea
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• 2006.09a
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• pp.23-33
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• 2006

Generally wave buoy and visual observation are used to measure sea waves. But the wave buoy cannot be applicable for the ship moving in deep sea. So the visual observation has been used for it. But it has several defects and limitation related to environmental condition and observer. To overcome this problem, various wave measurement systems have been suggested. Recently, the wave measurement systems using nautical X-band radar have been developed and extended its application area. In this report, we introduce the wave measurement system, WaveFinder, developed by authors. The system was calibrated and verified with the measurement results of wave buoy. The system was adopted to measure wave condition during sea trials. The system will be a device to support safe navigation in ship's voyage.