• Journal of the Institute of Electronics Engineers of Korea SC
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• v.37 no.2
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• pp.1-7
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• 2000

In this paper, an adaptive control law for nonlinear systems represented by input-output models are proposed under the assumption that unknown system parameters are in a known compact and convex set. Contrary to the previous results, the compact and convex set is not restricted to a ball whose center is at the origin or convex hypercube. It is proven that the proposed parameter update rule produces a sequence of parameters which reside in the set and guarantees that the position, velocity, and acceleration error converges to zero as time goes to infinity. This theoretical result was justified through simulations.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1995.05a
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• pp.117-122
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• 1995

원자력의 이용 분야 확대를 위하여 선박용 소형 동력로를 설계하였다. 본 연구에서는 다음의 제한 조건 및 설계 조건을 설정하여 핵적 개념 설계를 수행하였다. 노심의 부피는 국내 제작가능한 VLCC기종 유조선 기관실내에 배치 가능하도록 제한하였고, 선박의 정기 점검 기간에 맞춘 핵연료 재장전 주기 길이, 무붕산 노심 운전, 상용 가압경수로 보다 낮은 선출력과 출력 밀도, MUTSU호와 같은 1차 계통 열수력 조건, 등의 설계 조건을 설정하였다. 울진 3＆4의 핵연료 집합체의 길이만을 짧게 하여 사용하는 것에 대한 타당성 모색을 핵적 개념 설계 목표로 삼았다. 핵연료 집합체의 설계 및 반응단면적 생산은 CASMO-3 코트를, 노심 전체의 분석은 3차원 노달 코드인 KINS-3코트를 사용하였다. 개념 설계 결과, 노심 주기길이 690일을 달성할 수 있는 핵연료 집합체의 농축도와 갯수는 1.88%의 17개, 3.3%의 20개로 결정하였고, F$_{Q}$는 2.833이였고, 운전 상태에서의 감속재 온도 개수는 -24.8 pcm/$^{\circ}C$로 나타나서 한국형 원자로용 핵연료 집합체를 그대로 선박용 원자로에 사용 가능함을 볼 수 있었다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.40 no.1
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• pp.79-86
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• 2003

A new quantization constraint set based on the theory of Projection onto Convex Set(POCS) is proposed to reduce blocking artifact appearing in block-coded images. POCS-based postprocessing for alleviating the blocking artifact consists of iterative projections onto smoothness constraint set and quantization constraint set, respectively. In general, the conventional quantization constraint set has the maximum size of range where original image data can be included, therefore over-blurring of restored image is unavoidable as iteration proceeds. The projection onto the proposed quantization constraint set can reduce blocking artifact as well as maintain the clearness of the decoded image, since it controls adaptively the size of quantization constraint set according to the DCT coefficients. Simulation results using the proposed quantization constraint set as a substitute for conventional quantization constraint set show that the blocking artifact of the decoded image can be reduced by the small number of iterations, and we know that the postprocessed image maintains the distinction of the decoded image.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.2
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• pp.87-94
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• 2004

The feature subset selection is used as a preprocessing step of a teaming algorithm. If collected data are irrelevant or redundant information, we can improve the performance of learning by removing these data before creating of the learning model. The feature subset selection can also reduce the search space and the storage requirement. This paper proposed a new feature subset selection algorithm that is using the heuristic function based on entropy to evaluate the performance of the abstracted feature subset and feature selection. The ACS algorithm was used as a search method. We could decrease a size of learning model and unnecessary calculating time by reducing the dimension of the feature that was used for learning.

• Journal of the Korea institute for structural maintenance and inspection
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• v.19 no.3
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• pp.139-148
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• 2015

The purpose of this paper is to induce the ductile behavior of the UHPFRC member after the peak load by using the bundle of longitudinal reinforcing bar as a substitute for steel fiber. Experiments on the flexural behavior of the Ultra High Performance Concrete rectangular beam with the combination of the steel fiber and longitudinal reinforcing bar were carried out. The volume fractions of steel fiber are 0%, 0.7%, 1%, 1.5%, 2% and the reinforcement ratios of longitudinal reinforcing bar which induce the ductile behavior are 0.0036, 0.016, 0.028 and 0.036. 15 UHPC beams were made with the combination of these test factors. Not only steel fiber but also bundle of longitudinal reinforcing bar has the effect to induce ductile behavior of UHPC structural member. The combination of 0.7% volume fraction of steel fiber and 0.028 reinforcement ratio showed the most economic combination. The relationship of load-deflection, strain variation of the concrete and the crack pattern indicate the usefulness of the bundle of the longitudinal bar which has small diameter with close arrangement each other.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2005.11a
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• pp.164-165
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• 2005

• Proceedings of the Korean Fiber Society Conference
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• 1997.10a
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• pp.264-269
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• 1997

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.4
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• pp.19-26
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• 2008

Gene set enrichment analysis (GSEA) is a computational method to identify statistically significant gene sets showing significant differences between two groups of microarray expression profiles and simultaneously uncover their biological meanings in an elegant way by employing gene annotation databases, such as Cytogenetic Band, KEGG pathways, gene ontology, and etc. For the gone set enrichment analysis, all the genes in a given dataset are first ordered by the signal-to-noise ratio between the groups and then further analyses are proceeded. Despite of its impressive results in several previous studies, however, gene ranking by the signal-to-noise ratio makes it difficult to consider highly up-regulated genes and highly down-regulated genes at the same time as the candidates of significant genes, which possibly reflect certain situations incurred in metabolic and signaling pathways. To deal with this problem, in this article, we investigate the gene set enrichment analysis method with Fisher criterion for gene ranking and also evaluate its effects in Leukemia related pathway analyses.

• Korean Journal of Metals and Materials
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• v.47 no.6
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• pp.356-362
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• 2009

In order to vary the primary recrystallization textures, AA 1050 sheets were cold rolled in two different manners. Differences in cold rolling schedule gave rise to the formation of different cold rolling textures also leading to the formation of different primary recrystallization textures. Upon annealing for grain growth, changes in microstructure and texture hardly occurred in the sample depicting Cube recrystallization texture, while grain growth was accompanied with the development {001}<100> Cube texture in the sample displaying a recrystallization texture comprising of weak rolling texture components. The selective growth of Cube oriented grains is attributed to the high mobility of their grain boundaries.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1714-1717
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• 2010

디바이스 드라이버는 커널의 대부분을 차지하기 때문에 디바이스 드라이버에 문제가 발생하면 시스템에 심각한 영향을 미치게 된다. 따라서 디바이스 드라이버의 고장 분리 기술은 운영체제의 신뢰도 향상을 위해서 매우 중요하다. 동적 코드 변환 기법(Binary Translation)은 기계어 코드의 수준에서 기존의 디바이스 드라이버의 명령어 집합을 다른 명령어 집합으로 변환하여 실행하도록 하는 기법이다. 이 기법을 통해 우리는 각 명령어의 변환 과정에서 디바이스 드라이버의 모든 행위를 감시할 수 있다. 따라서 동적 코드 변환기법은 디바이스 드라이버의 고장을 분리하며 악의적인 메모리 접근을 제한하는 장점을 가지고 있다. 또한 커널 코드의 수정과 디바이스 드라이버의 수정이 요구되지 않는다. 이 논문에서 우리는 동적 코드 변환 기법을 설계하고 구현하였다. 그리고 동적 코드변환 기법을 이용한 몇 가지 실험을 통해, 디바이스 드라이버를 수행 시 발생하는 오버헤드와 고장 분리 가능 여부를 평가해 보았다.