• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.97-100
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• 2007

본 논문에서는 다차원 파일구조를 주어진 질의 패턴에 의해 최적으로 구성할 수 있는 방법을 제시한다. 지금까지의 다차원 파일구조는 응용 시스템에서 주어지는 질의의 패턴을 고려하지 않고 다차원 파일구조를 구성하는 애트리뷰트들의 클러스터링 정도를 동일하게 취급하였다. 그러나 다차원 파일구조를 이용하는 대부분의 응용 시스템에서 구성 애트리뷰트들 사이의 액세스 정도를 크게 다르게 하는 질의 패턴을 보인다. 따라서 본 논문에서는 다차원 파일구조의 응용 시스템에서 주어지는 질의 정보를 이용하여 각 구성 애트리뷰트들 사이의 클러스터링 정도를 각각 다르게 반영함으로써 최적이 되는 다차원 파일구조를 구성하는 방안을 제시한다. 먼저 질의처리의 성능이 질의 패턴에 주어진 질의 영역의 모양과 다차원 파일구조의 도메인 공간의 분할 상태를 나타내는 페이지 영역의 모양 사이의 유사성에 따라 크게 영향 받음을 보이고, 이러한 특성을 이용하여 수학적 분석을 통하여 제안된 기법의 이론적인 배경을 증명한다.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.509-511
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• 2004

This paper outlines the development of image processing system, which will allow the general users in Government and Public organizations easily to use and apply KOMPSAT EOC images in their own business. The system includes an import/export module of EOC image distributed in Hierarchical Data Format (HDF) file and various image processing analysis modules. Especially, the image mosaic and subset functions are designed to use EOC image as an image map, generating the Ortho-image module. To update the various spatial data with EOC image, some essential modules such as change detection by pattern recognition, overlay between images and vector data, and modification of vector data are implemented in the system. The system is developed based on the user request analysis of government agency, and suited for more efficient use of satellite image in public applications. Such system is expected to contribute to practical application of KOMPSAT-2 that will be launched in 2005. Further efforts will be made to accommodate the KOMPSAT -2 MSC data.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05a
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• pp.486-489
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• 2006

This paper presents a newly proposed object-oriented finite element framework and its applications on dynamic analysis of plate girder bridge. The developed framework supports various types of finite elements, materials, constraints, loads, and solution methods. One major feature different from other object-oriented finite element programs is that static model and dynamic state can be easily read from or written to a file. In addition, the framework supports efficient DOF pattern handling for a node connecting elements with different DOF patterns, new multi-point constraint handling, and various scripting languages for easy use of the library. In order to show the applicability to dynamic analysis, dynamic moving load analysis on plate girder bridge is performed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1996.04a
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• pp.592-596
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• 1996

The CAD/CAM System oriented to StereoLithographic Rapid Prototyping was constructed and developed. The software architecture uses a 586PC running the windows NT operating system. An .STL file brought into the software program can be verified in divers view points and focused for a detail of concern. A variety of Entity was applied to define an array of triangular facets and sliced loops. The system provides Edit, Scale, Orient, Copy and Divide commands to modify .STL model. The NC codes are created according to various laser beam scan pattern and the software show the parts on the platform before they are constructed. This system is written in Visual C and has been proved as a powerful tool for producing solid parts directly from a CAD modelling, using actual applications.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.17 no.32
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• pp.53-62
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• 1994

This paper deals with the analysis of the PC communication service system performance which will be installed as a gateway between PSTN and PSDN. Firstly, we classify the data traffic pattern into interactive, conversational, and file transfer type from the actual statistics. Secondly, we model the system structure as a closed queueing network model with multiservers and multiple customer classes and derive the analytic method to be able to measure the system performance using Mean Value Analysis. Finally, the simulation results indicate that the analytic method obtained is a good approximation method to measure the system performance of the PC communication service system as a gateway between PSTN and PSDN.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.275-278
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• 2013

Log is a file system, a system that uses all remaining data. Want situation now being issued in the IT, media Nate on information disclosure, the press agency server hack by numbness crime occurred. Hacking crisis that's going through this log analysis software professionally for professional analysis is needed. The present study, about APT attacks happening intelligently Log In case of more than traceback in advance to prevent the technology to analyze the pattern for log analysis techniques.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10a
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• pp.625-628
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• 2000

선반입 및 캐슁에 관한 기법은 병렬 파일 시스템 등의 저장 장치의 입출력 성능을 개선하는 효과적인 방법으로써 현재까지 여러 가지 연구가 많이 이루어져 왔다. 특히 선반입 기법은 응용프로그램에서 사용할 데이터 블록을 디스크로부터 미리 가져옴으로써 실제 필요할 때의 디스크 입출력 횟수를 줄여 실행 시간을 단축시키는 방법이다. 본 논문에서는 리눅스 기반의 병렬 파일 시스템 상에서 선반입 되는 블록의 수를 제한하여 캐쉬의 효율성을 높이고 실행 시간을 단축시키는 선반입 기법을 구현하였다. 특히 순차적인 접근을 하는 대용량 파일에서 그 성능이 개선됨을 보여 준다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.5C
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• pp.305-312
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• 2005

Three classification algorithms are tested using musical instruments. Several classification algorithms are introduced and among them, Bayes rule, NN and k-NN performances evaluated. ZCR, mean, variance and average peak level feature vectors are extracted from instruments sample file and used as data set to classification system. Used musical instruments are Violin, baroque violin and baroque cello. Results of experiment show that the performance of NN algorithm excels other algorithms in musical instruments classification.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.777-778
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• 2006

In this thesis, we design and implement a Flash Cache Core Module (FCCM) which operates on the YAFFS NAND flash memory. The FCCM applies memory replacement policy and prefetching policy based on the page reference pattern of applications. Also, implement the Clean-First memory replacement technique considering the characteristics of flash memory. In this method the decision is made according to page hit to apply prefetched waiting area. The FCCM decrease I/O hit frequency up to 37%, Compared with the linux cache and prefetching policy. Also, it operated using less memory for prefetching(maximum 24% and average 16%) compared with the linux kernel.

• Speech Sciences
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• v.10 no.4
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• pp.63-71
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• 2003

This study aims to experiment on learning French intonation, based on the visualization of melody, which was employed in the early sixties to reeducate those with communication disorders. The visualization of melody in this paper, however, was used to the foreign language learning and produced successful results in many ways, especially in learning foreign intonation. In this paper, we used the PitchWorks to visualize some French intonation samples and experiment on learning intonation based on the bitmap picture projected on a screen. The students could see the melody curve while listening to the sentences. We could observe great achievement on the part of the students in learning intonations, as verified by the result of this experiment. The students were much more motivated in learning and showed greater improvement in recognizing intonation contour than just learning by hearing. But lack of animation in the bitmap file could make the experiment nothing but a boring pattern practices. It would be better if we can use a sound analyser, as like for instance a PitchWorks, which is designed to analyse the pitch, since the students can actually see their own fluctuating intonation visualized on the screen.