$p^{n-m}$ fractional Factorial Design Excluded SOme Debarred Combinations

Choi, Byoung-Chul,Kim, Hyuk-Joo 한국통계학회 2000 Communications for statistical applications and me Vol.7 No.3

In order to design fractional factorial experiments which include some debarred combinations, we should select defining contrasts so that those combinations are to be excluded. Choi(1999) presented a method of selectign defining contrasts to construct orthogonal 3-level fractional factorial experiments which exclude some debarred combinations. In this paper, we extend Choi's method to general p-level fractional factorial experiments to select defining contrasts which cold exclude some debarred combinations.

백서 척수후근절로부터 슈반세포의 효과적인 체외 배양법

김성민,이종호,김남열,안강민,최원재,최시호,차미주,이주영,황순정,장정원,명훈,최진영,서병무,정필훈,김명진 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.4

Schwann cells(SCs), an important component of the peripheral nervous system, intract with nerous to mutually support growth and replication for the peripheral nerve regentation. Recently, ading SCs to the lumen of guidance channel is widely tried to improve regeneration or to make regeneration possible over otherwise irreparable gaps. however, it is not easy to isolate and multiplicate SCs as much as enough to help the axonal regeneration. For the allogeneic SCs source for tubular nerve guidance, we developed a little bit improved technique of harvesting and multiplicating SCs. by culturing dispersed dorsal root ganglia in specially designed medium with growth factors and serial processing, we repeatedlly generate relatively homogenous SC cultures. Our technique was compared with other methods of literature using immunostaining methods such as GFAP, S100, BDNF and the total SC count assessment at different time interval after primary culture.

접지선 굵기 산정방식에 관한 연구

崔洪圭,崔秉淑,宋榮柱 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-

Ground wire must choose enough sectional area of conductor endurably in maximum fault current, fault duration time, maximum allowable temperature and have strong durability and life-time can bear enough from spontaneous corrosion or electrolytic corrosion and must choose material that problem does not exist electrically and mechanically when connection or junction. In this paper, modeled new ground wire size numerical formula, and examine and compare of modeled numerical formula and abroad regulation, and proved and analyzed validity of the new ground wire size computation method because do simulation to computer program.

제올라이트 A를 혼화재로 사용한 모르터의 특성 연구

조병후,최고열,이창용,김봉주 서울産業大學校 1999 논문집 Vol.50 No.2

The characteristics of cement pastes and mortars containing zeolite A were investigated. The hydration of C₃S was a little restrained in cement pastes containing Zeolite A. The cement pastes containing zeolite A also exhibited that the formation of Ca(OH)₂ decreased and the amount of macropores increased with zeolite content. The strength of the mortar admixed zeolite A was lower than that of plain and decreased with zeolite content. These results would be related to the residual NaOH in the powder of zeolite A, which had influence on the cement hydration.

한국산 화살나무속(노박덩굴과)의 수리분류학적 연구

김주환,최병희,김윤식 대전대학교 이과대학 기초과학연구소 1997 自然科學 Vol.- No.-

한국산 화살나무속 16분류군의 분류군간의 한계를 규명하고 속내분류체계의 타당성을 논하고자, 화살나무속 107개의 OTU를 대상으로 60개의 외부형태형질에 대한 유집분석과 주성분분석의 수리분류학적 연구를 수행하였다. 중심연결법과 Ward방법에 의한 두 가지 유집분석의 결과, 유집군들의 구성이 거의 동일하게 나타났으며, grouprks에는 유사도가 매우 높은 것으로 관찰되었고, 각 종간에는 독립적으로 높은 수준의 유집이 형성되어 뚜렷한 불연속성이 존재하는 것으로 나타났다. 주성분분석결과 주성분1(38.4%), 주성분2(27.5%), 주성분3(17.2%)이 총 83.2%의 기여율을 보였으며, 이를 3차원공간에 투영하여 뚜렷한 5개의 유집군으로 구분할 수 있었다. 본 연구결과, 속내 각 종집단간의 명확한 불연속성이 관찰되었으나, sect. Biloculares의 분류학적 위치에 관한 문제점등이 제시되었다. 또한, 속내 분류체계에 있어서 Blakelock의 견해가 타당한 것으로 판단된다. This study was conducted to elucidate the delimitations of 16 taxa of Euonymus in Korea and to discuss the infrageneric classification system among the treated taxa by cluster analysis and principle components analysis (PCA) using 107 OTUs with 60 morphological characters. Based on the results of cluster analyses by the Ward and the UPGMC methods, there were similarities on the composition of clustered taxa and distinct discontinousity independently among the species. The treated taxa were divided into five groups by the PC1, PC2 and PC3, and the sums of contributions for the total variance were 83.2% (PCI 38.4%, PC2 27.5% and PC3 17.2%, respectively). This study suggested that there were taxonomic problems on the limits and composition of taxa in sect. Biloculares. The current study supported the infrageneric system of Euonymus proposed by Blakelock.

1996년과 1999년 경기지역 초등학교 학생들에서 유행성이하선염에 대한 면역도 조사

나병국,이주영,고운영,이진수,신구철,이주연,최보율,기모란,양병국,강춘,김우주,김지희 대한감염학회 2001 감염 Vol.33 No.3

Background : Although massive use of live attenuated mumps virus vaccines successfully reduced the incidence of mumps virus infection worldwide, mumps outbreaks have not been completely eliminated, even in vaccinated populations. In recent years, the incidence of mumps has been remarkably increased in Korea. This study was designed to evaluate the recent seroprevalence rate of mumps IgG among children in Kyonggi province at 1996 and 1999. Methods : Study population included students from 8 elementary schools in Kyonggi province. Serum samples were collected twice at 1996 and 1999 and tested for mumps-specific antibody by enzyme-linked immunosorbent assay (ELISA). We also conducted a questionnaire survey on the parents and collected the records including history of vaccination and mumps infection. Results : The seropositive rates against mumps were 89.47% and 89.74% at 1996 and 1999, respectively, and they were not significantly different when compared to age, sex, and region. Although the first vaccination rates were 92.17% and 92.25% at 1996 and 1999, respectively, the second vaccination rates were only 37.89% and 38.03% at 1996 and 1999, respectively. Infection rate showed no significant difference between vaccinated groups and nonvaccinated gropus. Seropositive rate of infected group was higher than that of noninfected group but it was not significantly different between the vaccinated and the nonvaccinated. Conclusions : This study showed the seropositive rate and vaccination against mumps in children. There were no significant relationships between vaccination and infection. Therefore, it seems likely that the vaccination is not fully protective against mumps infection. This study will be helpful for the establishment of guideline for prevention and treatment of mumps in Korea. (Korean J Infect Dis 33: 157∼164, 2001)

안전한 네크워크 환경을 위한 IP 역추적 시스템에 관한 연구

채철주,김재동,최병선,김지현,이재광 韓南大學校 2007 論文集 (인문·사회·자연과학·공학) Vol.37 No.-

컴퓨터 통신 네트워크의 급속한 발전은 사회 전반적인 부분에 많은 발전을 가지고 왔으나 이러한 통신 기술의 발전은 악의적인 목적을 가진 사용자들의 침입 증가라는 부작용을 초래하였다. 이로 인하여 좀 더 안전한 사이버 세상을 요구하는 많은 요구 사항들이 나타나고 있다. 이처럼 인터넷이 우리사회 전반의 지식 정보화 사회의 기반으로 발전하고 있는 반면, 정보통신망 역기능인 정보변조,해킹 등과 같은 불법적인 요소가 난무하는 장소로 변질되고 있는 것 또한 현실이다. 정보의 개방으로 인해 해킹 기술의 접근이 손쉬워진 현 상황에서 네트워크상에서 서비스를 제공하는 호스트들에 대한 보안 강화는 필수적인 요소로 대두되고 있다. 이러한 문제를 해결하기 위해서 본 논문에서는 능동적인 보안 시스템으로 IP 역추적 시스템을 제안하여 위와 같은 문제점들을 해결하고자 한다. There is a tremendous increase in the growth of Internet making people's life easy. The rapid growth in technology has caused misuse of the Internet such as cyber Crime. There are several vulnerabilities in current firewall and Intrusion Detection Systems (IDS) of the network computing resources. Automatic real time station chase techniques can track the Internet invader and reduce the probability of hacking. Due to the recent trends the station chase technique has become inevitable. In this paper, we design and implement lP traceback system using ICMP Traceback message. In this design there is no need to modify the router structure and we can deploy this technique in larger network. Our Implementation shows that ICMP Traceback system is safe to deploy and protect data in Internet from hackers and others.

땅비싸리와 좀땅비싸리의 형태적변이 및 분류

조숙경,최병희,김주환 대전대학교 이과대학 기초과학연구소 1997 自然科學 Vol.- No.-

동북아시아에 분포하는 땅비싸리와 좀땅비싸리의 분류학적 한계를 규명하기 위하여 형태적 변이와 염색체수가 조사되었다. 땅비싸리의 이명으로 취급되어 왔던 좀땅비싸리는 소엽의 모용, 꽃의 크기, 화분형태, 지리적 분포 등에 있어 땅비싸리와 뚜렷한 차이를 보였으며, 또한 염색체수가 4배체(2n=32)로 나타나, 2배체(2n=16)인 땅비싸리와 차이를 보였다. 땅비싸리와 좀땅비싸리 11 집단을 대상으로 19개의 외부형태 형질에 대한 주성분분석을 실시한 결과 두 종은 제1주성분에 의해 뚜렷이 나누어 졌는데, 전체분산에 대한 제1주성분의 기여율은 63.2%이었으며, 제1주성분은 소엽 표면의 털과 화서의 길이 등과 높은 상관성을 보였다. 이러한 결과로부터 좀땅비싸리는 땅비싸리와는 구별되어 독립된 종으로 처리되었다. 한편 큰땅비싸리는 땅비싸리의 변이의 한 형태로 판단되므로 땅비싸리의 이명으로 처리되었다. 각 종의 지리적 분포에 대한 분류학적 의의가 염색체수 변이 등과 비교논의 되었다. The morphological analysis and cytological study of Indigofera kirilowii Maxim. and Indigofera korean Ohwi were undertaken to assess the numbers and ranks of taxa that usefully could be recognized. I, koreana, previously recognized as I. kirilowiii, was separated from I. kirilowii in hairiness on leaflets, flower size, pollen exine sculptures, geographical distribution and chromasome number. Chromosome count of 2n=32 (tetraploidy) from I. koreana was obtained for the first time. The results of principal components analysis (PCA) on a matrix of 11 populations of Korea by 19 morphological characters indicated that two species could be recognized by the first principal component, contribution of which for the total variance is 63.2%. Our results supported that I. koreana could be clearly distinguished from I. kirilowii. Since the quantitative differences between the two varieties, I. kirilowii var. coreana and var. Kirilowii, were smaller, a nomenclatural synonymy was developed for them, ie, var. kirilowii.

관상동맥질환 환자에서 스텐트 시술 후 재협착에 관한 연구

강진환,권영주,박상호,한대희,이상철,김명구,변정득,최병조,심규혁,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background and aims : In the coronary artery disease, a rate of restenosis was much decreased by placement of coronary stent than when percutaneous transluminal coronary angioplasty has been applied, but there are still important clinical problems of restenosis. There has been many progressive studies about various factors contributed to this restenosis. So, we studied a relation between restenosis after placement of coronary stent in the coronary artery disease and many clinical factors, characteristics of stenotic lesion and procedural factors, and also assessed the restenosis rate of various coronary stents. Methods : Total 58 lesions(46 cases of patients ; man 30, woman 16) were evaluated, which has been performed a follow-up coronary angiography after 6 months (mean 188 days) since coronary stent had been placed. Various stents were implanted and assessed a relation between restenosis and many factors. Results : Of 58 lesions were target stenotic studies, there were 22 of restenotic lesions(37.9%), and the restenosis rate wes statistically significant difference in the relation with diabetes mellitus(p<0.05), group of acute myocardial infarction(p<0.05) among clinical diagnosis of ischemic heart disease(stable angina, unstable angina and acute myocardial infarction) in clinical factors and with high dilation pressure of stent(p<0.05) in procedural factors. When the rate of restenosis was evaluated among implanted stents, it was lowest in the Multilink^(®) stent and highest in the Nir Royal^(®) stent(60%). Conclusion : In this study of restenosis and various factors after placement of stents in the coronary artety disease, factors such as diabetes mellitus, group of acute myocardial infarction and a dilation pressure of stent were significant related with restenosis and the restenosis rate of Multilink^(®) stent was lowest and the highest restenosis rate was of Nir Royal^(®) stent.

허혈성 심질환에서 염증지표에 관한 연구

번정득,권영주,박상호,한대희,이상철,강진환,김명구,심규혁,최병조,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background : Atherosclerosis is the chief underlying cause of ischemic heart disease and there is increasing evidence that inflammation is an important determinant of the development of atherosclerosis. We assessed the levels of inflammatory markers in patients with ischemic heart disease and normal group who has normal coronary angiograms. Materials and Methods : Coronary angiography was performed in 142 patients. 107 patients of ischemic heart disease(stable angina pectoris 58, unstable angina pectoris 30, Acute myocardial infarction 19) and 38 normal control subjects. We assessed the level of inflammatory markers, such as CRP, ESR, fibrinogen and leukocyte. Results : CRP, ESR and fibrinogen values of the patients with stable angina pectoris and unstable angina pectoris were higher than that of normal control group, but there were no statistical significance. Leukocyte value of the patients with unstable angina pectoris(9003.3±701.5/mm^(3)) was significantly higher than that of the patients with stable angina pectoris(6685.5±245.8/mm^(3)) and normal control subjects(6394.3±235.1/mm^(3)). CRP, ESR and fibrinogen values of the patients with acute myocardial infarction were also higher than that of normal control subjects. CRP was 3.88±2.05 mg/dL in acute mocardial infarction group, and 0.29±0.15 mg/dL in normal control subject group(p<0.05). Fibrinogen was 541.6±45.1 mg/dL in acute myocardial infarction group, 321.4±25.6 mg/dL in normal control subject group(p<0.05). Leukocyte was 10942.1±737.6/mm^(3) in acute myocardial infarction group, 6394.3±235.1/mm^(3) in normal control subject group(p<0.05). Conclusions : This study demonstrate that CRP, fibrinogen and leukocyte values of acute myocardial infarction group were significantly higher than that of control group and stable, unstable argina pectoris group. Leucokyte values were significantly elevated in unstable angina group, but CRP values were not in unstable angina group.