• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.502-504
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• 2004

해마다 보고되는 보안 취약점은 크게 늘어나고 있으며, 이를 보완하기 위한 보안패치 역시 릴리즈 되는 시간 간격이 짧아지고 있는 실정이다 따라서, 효과적인 보안패치 분배 작업이 이루어지기 위해서는 자동화된 보안패치 관리 시스템의 도입이 절실히 필요하다. 본 논문에서 이러한 필요성을 기반으로 한 지금까지의 보안패치 분배 및 관리 시스템에 대한 연구 내용들을 분석함으로써 보안패치 분배 및 관리 시스템이 갖추어야 할 요건들을 살펴보고, 이러한 문제점들을 해결하기 위한 프레임워크를 직접 설계함으로써 그 해결 방안을 제시하고자 한다

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.508-510
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• 2004

최근 네트워크를 통한 시스템 침해사고가 증가하고 있고, 이러한 침해사고는 대부분 시스템에 존재하는 취약성을 이용한 공격이므로 관련 패치의 설치는 매우 중요하다. 그래서 최근 자동화된 패치 관리 시스템의 연구가 많이 이루어지고 있다. 특히 시스템의 가장 기본적인 기능인 정확한 보안패치 분배는 중요하지만 벤더에 의존적이어야 하므로 어려움도 따른다. 본 논문에서는 Windows 환경에서의 의존성 해결을 위한 보안패치 분배 시스템을 설계하고 구현하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.559-561
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• 2002

시스템이나 네트워크 보안에 있어 관련된 페치의 업데이트는 보안의 최우선적 사항이다. 그러므로 패치 분배과정에 있어 패치 정보가 누출된다는 것은 시스템이나 네트워크의 취약성이 그대로 노출되는 것과 같은 문제를 발생시킨다. 본 논문에서는 일반적인 인터넷 환경에서의 패치 분배가 아닌 특정 조직이나 기관의 도매인 내부에서 안전하게 패치를 분배할 수 있는 구조에 대하여 제안한다. 본 제안 구조에서는 서버 인증서 기반의 사용자 인증, SKIP 모듈러스를 사용하는 DH 키분배, 패치 체크섬 암호화를 통한 기밀성ㆍ무결성 보장, 원격지에서의 패치 자동 설치 기능을 제공한다.

• Weed & Turfgrass Science
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• v.7 no.2
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• pp.87-97
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• 2018

Turfgrass provides various beneficial effects to our societies such as recreation, aesthetic components, and other public service. Diseases in turfgrass is the major issue, which cause quality problems in golf courses, playgrounds, parks and cultivation areas, and tremendous cost is required to prevent the diseases. Research activity and investigation for turfgrass disease remain to be further attributed when compared to other crops in Korea. In this study, we present previously reported turfgrass diseases researches, especially caused by fungal pathogens, and review the history of turfgrass research activity in Korea to contribute future turfgrass research direction. Research papers were searched and analyzed using Korea Educational and Research Information Service (www.riss.kr). More than eighty papers presented turfgrass diseases and among the papers, 50% were published in Korean Journal of Turfgrass. Half of the papers reported turfgrass diseases control. Research articles about large patch disease were the majority (36%), followed dollar spot (18%), Pythium blight (10%) and Typhular blight (8%). Number of the first disease reports in Korea were total fifteen. Total 542 fungicides have been registered in Korea to prevent turfgrass diseases and most of the fungicides were for brown patch, rust, yellow patch, dollar spot, snow mold, summer patch, anthracnose, Pythium blight, powdery mildew and algae. And we will also need to conduct ecological studies on turf diseases and to develop control methods with improved efficacy and environmentally-friend sound. Researches on epidemiology of turfgrass diseases which deals with the incidence, distribution, and interactions with other factors will be also greatly favored for precise control prescription, timing of control and use of less pesticides.

• Weed & Turfgrass Science
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• v.4 no.2
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• pp.124-128
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• 2015

Large patch, caused by Rhizoctonia solani AG2-2 IV, is a soil-born disease that is the most important of warm season turfgrass such as zoysia and Bermuda grass. This study was conducted to analysis of the soil microbial community structure on large patch. Center of the large patch (CLC), edge (CLE) and healthy (CLH) part of microbial communities were examined using metagenomics in Phylum level. Distribution trends of the rhizosphere microorganisms were similar to the order Proteobacteria, Acidobacteria, Chloroflexi, Firmicutes, Planctomycetes, Gemmatimonadetes, Nitrospira, Cyanobactria and Verrucomicrobia in soil collections. Contrastively Actinobacteria was more 56% abundant in healthy part soil (16%) than in the center (9.28%) or edge (10.84%) parts. Taxonomic distributions were compared among the CLC, CLE and CLH, total 6,948 OTUs were detected in the CLC, 6,505 OTUs for the CLE and 5,537 OTUs were detected in the CLE. Distributions of Actinobacteria OTUs were appeared 615 OTUs in the CLC, 709 OTUs in the CLE and 891 OTUs in the CLH. Among Actinobacteria, 382 OTUs were overlapped in the all soils. Not matched OTUs of CLH (286 OTUs) was detected 23 times higher than CLC (91 OTUs) and CLE (126 OTUs).

• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.1A
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• pp.39-48
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• 2012

This study deals with numerical determination of stress intensity factors of adhesively patch-repaired plates with cracks at V-shaped or semicircular notches. The p-convergent anisoparametric model are considered and then three-dimensional virtual crack closure technique is presented using formulations of anisoparametric elements. In assumed displacement fields of an element, strain-displacement relations and three-dimensional constitutive equations are derived with three-dimensional hierarchical shape functions expanded from one-dimensional Lobatto functions. Transfinite mapping technique is used to represent a circular boundary. The present model provides accuracy and simplicity in terms of stress concentration factor, stress distribution, the number of degrees of freedom, and non-dimensional stress intensity factor as compared with previous works in literatures. Stress intensity factors obtained by the three-dimensional virtual crack closure technique are estimated with respect to the variation of width of finite plate, radius of notch root, angular inclination of V-shaped notch, and crack length.

• Korean Journal Plant Pathology
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• v.10 no.1
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• pp.54-60
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• 1994

Incidence of Rhizoctonia blight ranged from 22.2% to 100% in the golf courses at six geographical locations in Korea from 1989 to 1993. Rhizoctonia blight occurred more severly in southern area than in northern area. Fifty seven isolates of Rhizoctonia solani obtained from diseased parts of zoysiagrasses were grouped to AG2-2 by anastomosis test. Pathogenicity testes revealed that this pathogen was strongly pathogenic to Korean lawngrasses(Zoysia japonica, Z. matrella, Z. tenuifolia), but not pathogenic to creeping bentgrass(Agrostis palustris), bermuldagrass(Cynodon dactylon), Kentucky bluegrass(Poa pratensis), perennial ryegrass(Lolium prenne), and creeping red fescue(Festuca rubra subsp. rubra L.). The isolation frequency of R. solani AG2-2 fro sheaths of the infected plants was the highest by 91.67%, and that from stolons and roots was 11.13% and 5.63% respectively. The pathogen was not isolated from the leaves. Population density of R. solani in the lawn of large circular patch was highest on surface soils down to 1 cm deep with the value of 4.9$\times$104 (CFU/g soil), but below 1 cm population density decreased sharply down to 0.8~9.8$\times$103 (CFU/g soil). Horizontal distribution of propagules in turfgrass soil was higher in the margin than in center of patch, where the number of propagules was similar to these of healthy looking soils close to the margin of diseased patch. The meteorological factors influencing the outbreak of the disease were temperature, the number of rainy days and precipitation. Optimum temperature for disease development of Rhizoctonia blight in field was 20~22$^{\circ}C$, and that for hyphal growth of R. solani AG2-2 in vitro was 25~3$0^{\circ}C$. In Pusan area, Rhizoctonia blight first occurred in late April and rapidly developed in late June. The disease slightly decreased during July to August and developed again in late September in 1993. The monthly disease progress in Pusan area was similar to that in Kyeonggi province.

• Journal of Ecology and Environment
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• v.29 no.2
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• pp.75-84
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• 2006

In Korea, a bibosoop is a type of village grove fostered to complement a weak part of the village from a Feng-Shui perspective. We examined the characteristics of bird communities in remaining bibosoops in two regions, Gyeonggi-do Province and Jeollanam-do Province. We surveyed patch preferences of birds at two landscapes in Gyeonggi-do Province. One contains a bibosoop with other rural landscape elements, and the other does not have a bibosoop. The two landscapes of Gyeonggi-do Province were similar to each other in the distribution of landscape elements. We observed that species richness was significantly higher at the site with a bibosoop, and that tits, Mandarian ducks, starlings, Eurasian scops owls, and woodpeckers utilized the bibosoop as a nesting site. Birds preferred the landscape with the bibosoop, and the internal movement of birds was significantly higher at the landscape with the bibosoop than at the other. The results suggest that bibosoops serve as a unique biotope that provides nest sites for cavity nesters, especially near nest-insufficient forests, and enhance the internal movements of birds among patches in the landscape.

• Journal of the Korean Society of Clothing and Textiles
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• v.29 no.9_10 s.146
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• pp.1359-1368
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• 2005

When we develop the tight-fit 2D pattern from the 3D scan data, segmentation of the 3D scan data into several parts is necessary to make a curved surface into a flat plane. In this study, Garland's method of triangle simplification was adopted to reduce the number of data point without distorting the original shape. The Runge-Kutta method was applied to make triangular patch from the 3D surface in a 2D plane. We also explored the detailed arrangement method of small 2D patches to make a tight-fit pattern for a male body. As results, minimum triangle numbers in the simplification process and efficient arrangement methods of many pieces were suggested for the optimal 2D pattern development. Among four arrangement methods, a block method is faster and easier when dealing with the triangle patches of male's upper body. Anchoring neighboring vertices of blocks to make 2D pattern was observed to be a reasonable arrangement method to get even distribution of stress in a 2D plane.

• Journal of Chest Surgery
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• v.19 no.3
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• pp.363-373
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• 1986

Even though the pathogenesis is still controversial, electrocardiographic changes after congenital open heart surgery depend on various etiologic factors. Author reviewed 261 cases of congenital open heart surgery patient experienced in the Dept. of Thoracic & Cardiovascular Surgery, Pusan National University Hospital, since July, 1981 to Sept., 1985. The results were summarized as followed: 1. The age distribution was from 3 to 29 years old with mean age 10.8 years. And the most frequent congenital heart defect we had done operation was VSD. 2. Preoperatively, the most frequent ECG finding was abnormal QRS complex and postoperatively the most frequent ECG change was arrhythmia. 3. The most frequent arrhythmia before operation was intraventricular conduction disturbance. 4. Right ventriculotomy incision produced the more frequent abnormal ECG changes postoperatively than right atriotomy or pulmonary arteriotomy. 5. According to the operative technique, outflow patch graft of TOF repair produced the highest frequency of ECG changes after operation, and in comparing simple and patch closure of VSD, the latter was higher frequency of ECG changes, in valvotomy and infundibulectomy of PS, the latter was higher too. 6. The common symptom and signs in abnormally ECG changed patients after operation were palpitation, dyspnea, congestive heart failure and murmur in this order., 7. The longer the time of CPB, the more number of abnormally ECG changed patients had been developed after operation. 8. The most of postoperative ECG changed patients recovered spontaneously or with only medication and were clinically insignificant. And the rest other minor group recovered with temporary pacing. Eight cases out of 261 [3.1%], these with abnormal QRS complex and arrhythmia couldn`t recover in spite of every effort and eventually succumbed.