• Journal of Korean Society of Steel Construction
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• v.27 no.4
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• pp.411-422
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• 2015

The design and buckling behavior of earth retaining system supported by high strength steel pipe and PHC pile under compression is presented in this study. Buckling analysis of various strut system was investigated according to the strut total length(30m, 60m, 90m), three types of built-up columns and connection condition. Buckling loads calculated by F.E analysis was compared with the theoretical solution corresponding to diagonal buckling mode, local and global buckling mode of main strut. The design of the built-up column struts are performed based on design guide for high strength steel pipes and P-M diagram for built-up column with two PHC pile section.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.1025-1028
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• 2001

인터넷의 확산과 이용자의 급증으로 웜바이러스에 대한 문제가 최근에 크게 대두되고 있다. 스크립트 형 웜바이러스의 경우 제작이 쉬워 누구나 몇 시간의 학습을 통하여 바이러스를 제작찬 수 있다. 이러한 문제의 심각성은 최근 7개월 동안의 바이러스 통계에서도 나타나는데 전체 바이러스 중 평균 22.5%를 차지하고 있다. 이러한 웜바이러스를 차단하기 위해서 여러 가지 방법들이 사용되고 있으나 E-mail로 급속하게 퍼지는 웜바이러스의 확산을 차단하기 위해서 네트워크 기반의 시스템 보호방법이 요구되어지고 있다. 이에 본 논문에서는 알려지지 않은 웜바이러스로부터 내부 네트워크를 방어하기 위한 면역시스템을 제안한다. 자동화된 면역 시스템은 분산된 각각의 웜바이러스 탐지 시스템들이 새로운 바이러스 정보를 동적으로 공유할 수 있도록 하여 새로운 바이러스로부터 해당 시스템과 그 시스템이 속해 있는 내부 네트워크를 바이러스로부터 보호할 수 있도록 한다.

• Electronics and Telecommunications Trends
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• v.32 no.3
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• pp.56-67
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• 2017

오랫동안 미개척 주파수 대역이었던 테라헤르츠 대역은 소자 및 시스템 기술 연구성과의 축적과 기술 성숙 과정을 거쳐, 최근 다수의 상용화 시스템이 출시되는 등 산업 분야에의 응용이 확산되었다. 특히, 투과 이미징이 가능한 테라헤르츠 이미징 시스템은 산업 분야에서 비접촉 비파괴 품질검사 분야 등에 많은 응용이 기대되고 있다. 이밖에 분광 기술에 기반을 둔 막 두께 측정 시스템, 초고속 통신 시스템 등도 향후 중요한 테라헤르츠 기술 응용 분야로 여겨지고 있다. 본고에서는 테라헤르츠 응용 기술에 관한 최근의 연구 동향을 간략히 살펴보고, 한국전자통신연구원 전파위성연구본부 테라헤르츠 창의원천연구실에서 주력해 온 포토닉스 기반 테라헤르츠 소자 및 시스템에 관해 상세히 소개한다.

• Journal of Life Science
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• v.31 no.6
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• pp.568-573
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• 2021

This study identified genomic factors associated with endoplasmic reticulum protein (ERp)29 gene expression in a genome-wide association study (GWAS) of genetic variants, including single-nucleotide polymorphisms (SNPs). In total, 373 European genes from the 1000 Genomes Project were analyzed. SNPs with an allelic frequency of less than or more than 5% were removed, resulting in 5,913,563 SNPs including in the analysis. The following expression quantitative trait loci (eQTL) from the long noncoding RNA LOC105372577 were strongly associated with ERp29 expression: rs6138266 (p<4.172e10), rs62193420 (p<1.173e10), and rs6138267 (p<2.041e10). These were strongly expressed in the testis and in the brain. The three eQTL were identified through a transcriptome-wide association study (TWAS) and showed a significant association with ERp29 and osteosarcoma amplified 9 (OS9) expression. Upstream sequences of rs6138266 were recognized by ChIP-seq data, while HaploReg was used to demonstrate how its regulatory DNA binds upstream of transcription factor 1 (USF1). There were no changes in the expression of OS9 or USF1 following ER stress.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.23-25
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• 2019

낸드 플래시 메모리(NAND Flash Memory)는 컴퓨터 시스템의 대용량 저장장치를 위한 소자로써, 대용량화의 주요 원인으로는 메모리 셀(Cell) 당 저장할 수 있는 비트 수를 증가시킴으로써 집적도를 증가시킨 것이다. 그러나, 이러한 집적도의 증가는 에러의 증가를 가져와서 저장장치에서 가장 중요한 신뢰성이 급격하게 저하하는 요인이며, 저장장치의 생명주기(Lifetime)을 감소시키게 된다. 기존에 낸드 플래시 메모리 저장장치의 Lifetime을 증대시키기 위해서 P/E cycle을 고려하여 데이터 영역의 일부를 점점 더 ECC 영역으로 변경시키는 방식을 적용한 바가 있다. 이러한 방식은 데이터 영역의 감소로 인한 저장장치 내에서 관리되는 호스트-플래시 간 데이터 관리 크기의 미스매치로 인한 여러 가지 오버 헤드를 생성한다. 본 연구에서는 P/E cycle에 따른 데이터 영역의 ECC 영역으로의 전환을 통한 Lifetime을 증가시키는 방식에 있어서, 오버헤드를 줄이기 위한 캐쉬 관리 구조 및 매핑 관리 구조에 대한 설계를 진행하였다. 이러한 설계를 낸드 플래시 메모리 기반 저장장치에 적용할 경우, LifeTime을 증대시키기 위해서 ECC를 데이터 영역으로 확장하는 방식을 사용할 때 저하될 수 있는 일반 읽기 및 쓰기의 성능 저하를 어느 정도 감소시켜줄 수 있을 것으로 기대한다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1998.06a
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• pp.153-157
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• 1998

It is wisely stated that the most valuable knowledge that a person cam acquire is the knowledge of how to learn. The human's learning is characterized by the ability to extract relationships between the different characters of a given situation. The ellipse is a first approach of comparison. We assimilate each character to a half axis of the ellipse and the result is a geometrical figure that varies according to values of the two characters. Thus, we take into account the two characters as an alone entity.

• Journal of Life Science
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• v.21 no.9
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• pp.1323-1328
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• 2011

We herein report the development of an agarose-gel-immobilized recombinant bacterial biosensor simple system for the field monitoring of phenolic compounds. Escherichia coli cells harboring the pLZCapR plasmid, which was previously designed to express the ${\beta}$-galactosidase reporter gene in the presence of phenolic compounds, were co-immobilized with a substrate [chlorophenol red ${\beta}$-galactopyranoside (CPRG) in agarose gel, and dispensed to the wells of a 96-well plate. Field samples were added to the wells and color development was monitored. In the presence of 5 ${\mu}M$ to 10 mM of phenol, the biosensor developed a red (representing hydrolysis of CPRG) color. Other phenolic compounds were also detected by this immobilized system, with the pattern resembling that previously reported for the corresponding non-immobilized biosensor. The immobilized cells showed optimum activity when the gel was simultaneously supplemented with 6% dimethyl formamide (DMF), 0.1% SDS and 10 mM $CaCl_2$. The immobilized biosensor described herein does not require the addition of a substrate or the use of unwieldy instruments or sample pretreatments that could complicate field studies.

• Journal of Korean Library and Information Science Society
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• v.32 no.4
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• pp.99-117
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• 2001

This paper reports on the development of an automatic book classification system using the faced classification principles of CC(Colon Classification). To conduct this study, some 670 words in the botanical field were selected, analyzed in terms [P], [M], [E], [S], [T] employed in CC 7, and included in a database for classification. The principle of an automatic classification system is to create classification numbers automatically through automatic subject recognition and processing of key words in titles through the facet combination method of CC. Particularly, a classification database was designed along with a matrix-principle specifying the subject field for each word, which can allow automatic subject recognition possible.

• Polymer(Korea)
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• v.33 no.5
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• pp.441-445
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• 2009

In order to develop an intelligent delivery system for cosmetic active agents (e.g., arbutin, ascorbic acid, and adenosine), pH-responsive P(MAA-co-PEGMA) hydrogel particles having an average size of approx. $2{\mu}m$ and spherical shape were synthesized via dispersion photopolymerization. There was a drastic change in the swelling ratio of P (MAA-co-PEGMA) hydro gels at a pH 5, which is the $pK_a$ of the hydrogel. To determine the factors that have an effect on the loading of cosmetic active agents into the hydrogel, the loading efficiency of the active agents was investigated at various MAA and EG compositions of the hydrogel and the loading pH conditions. When the MAA contents in the hydrogel decreased, the loading efficiency of the active agents increased. In loading experiments with different pH conditions, the active agents showed higher loading efficiency into the hydrogel at the pH where the hydrogel was at the swollen state than at the pH where the electrostatic repulsion was minimized.

• Korean Chemical Engineering Research
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• v.60 no.1
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• pp.116-124
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• 2022

In this study, waste air containing ethanol and hydrogen sulfide, was treated by an integrated hybrid system composed of two alternatively-operating UV/photocatalytic reactor-process and biofilter processes of a biofilter system having two units with an improved design (R reactor) and a conventional biofilter (L reactor). Both a pressure drop (△p) per unit process of the integrated hybrid system and a microbe-population-distribution of each biofilter process were observed. The △p of the UV/photocatalytic reactor process turned out very negligible. The △p of the L reactor was observed to increase continuously to 4.0~5.0 mmH₂O (i.e., 5.0~6.25 mmH₂O/m). In case of R reactor, its △p showed the one below ca. 16~20% of the △p of the L reactor. Adopting such microbes-carrying biofilter media with high porosity as waste-tire crumb media, and the improved biofilter design, contributed to △p of this study, reduced by ca. 37~50% and 40~53%, respectively, from the reported △p of conventional biofilter packed with biofilter media of the mixture (50:50) of wood chip and wood bark. In addition, the △p of R reactor in this study, reduced by ca. 80% from the reported △p of conventional biofilter packed with biofilter media of the mixture (75:25) of scoria with high porosity and compost, was mainly attributed to adopting the improved biofilter design. On the other hand, in case of L reactor, the CFU counts in its lowest column was analyzed double as much as those in any other columns. However, in case of R reactor, its CFU counts were bigger by 50% than the one of L reactor and its microbes were evenly distributed at its higher and lower columns of R_dn reactor and R_up reactor. This phenomena was attributed to an even moisture distribution of 50~55% of R reactor at its higher and lower columns. Therefore, R reactor showed superb characteristics in terms of both △p and microbe-population-distribution, compared to L reactor.