CBT를 이용한 안전한 멀티캐스트 그룹 관리

윤성현,장주만,조원환 高麗大學校附設 컴퓨터科學技術硏究所 1999 JOURNAL OF COMPUTER SCIENCE & ENGINEERING TECHNOLO Vol.2 No.-

보다 높은 대역폭에서 안전한 멀티캐스트 통신을 하고자 욕구는 기업, 정부, 그리고 인터넷을 사용하는 모든 단체에서의 고조되고 있고 또한 주요 관심사이다. 멀티캐스트 환경에서 보안성을 제공하기 위해 최근까지 진행되어 오고 있는 연구는 주로 그룹 키 관리 기법에 관한 것들이다. 본 논문에서는 화장성이 우수한 CBT 멀티캐스트 라우팅 프로토콜을 기반으로 안전한 인터넷 멀티캐스트를 위한 CBT기반 그룹 관리 시스템을 제안한다. 본 논문에서 제안하는 기법은 핵심라우터가 키 생성, 키 재구성, 그룹 가입, 탈퇴 등 그룹 관리 뿐 아니라 여러 가지 보안사항을 고려한 기능도 제공해 준다. The need for high bandwidth, very dynamic secure internet multicast communications is increasingly evident in a wide variety of commercial, government, and Internet communities. One of the most recently researches is mainly about the group key management schemes. In this paper, We'll propose a CBT-based group management system with scalable CBT multicast routing protocol. The benefits of this proposed technique are that it offers not only key generation, rekey, group join and leaving but also many functions lated security of multicast group.

결합비를 조정할 수 있는 광 결합기에 관한 연구

尹星鉉,鄭萬永 東亞大學校 大學院 1989 大學院論文集 Vol.14 No.-

When optical coupler is fabrecated with the polished single mode potical fiber, coupling ratio is controlled by the off α set of the coupler block. that caused the effective coupling length. In this paper, we propose the condition that coupling ratio is 0%, 50%, 100% by the effective coupling length.

실험적 진폐증에서 투여약제에 따른 면역학적 병리학적 조직변화

윤임중,임현우,노영만,오상용,정장영,임영,김경아 가톨릭 대학 산업의학 쎈타 산업의학연구소 1993 韓國의 産業醫學 Vol.32 No.2

To access the effects of some drugs such as piperazine phosphare, azathioprine and allopurinol in the experimental pneumoconiosis, 263 rats weighted 240-320 gm was divided into the control and eight experimental groups. To each group, the turbid solution mixed free silica, talc and natural coal dust of 50 mg in 0.8 ml saline were instilled intratracheally. At the begining and 5th week of experiment, piperazine phosphate(8mg/week orally), aspirin(1.5mg/day intramuscularly), azathioprine(25mg/day orally) and allopurinol(1.5mg/day orally) were administered simultaneously, while the dust turbid solution was only given to the control group. For each group the change of body weight. dry right lung weight, cellularity including total cell, macrophage, lymphocyte and neurtrophil in bronchoalveolar lavage fluid, superoxide ion, hydroxyproline, leukotriene B₄, tumor necrotsis factor, prostaglandin E₂were examined, and observed the pathological chages in lung tissue. The results were as follow : 1. The larger amount of their instilled dust and the longer observation period, the severer pathological findings were found in the lung tissue of each experimental group. 2. The body and dry right lung wight was not significantly changed in the experimental groups compared with the control group. 3. The number of total cell in bronchoalveolar lavage fluid was markedly less in the experimental group than the control one, while no significant difference was found in the percent alveolar macrophages and lymphocytes in both groups. However, the percent of neutrophiles was usually lower than in the control group. 4. The amount of superoxide ion was frequently less in the experimental group compared with the control one. 5. The amount of hydroxyproline was significantly lower in the experimental group than in the control one. 6. The amount of leukotriene B₄was usually less in the drug administered group than in the control one. 7. The amount of tumor necrotic factor was also frequently lower in each experimental group than in the control one. 8. The amount of prostaglandin E₂was usually higher in each experimental group than in the control one.

전격성 경과를 취한 만성 호산구성 폐렴 환자 1예

윤호상,진춘조,유광하,이상엽,이수인,정상만,김선두,이순제,이길도,전혜정 건국대학교 의과학연구소 2000 건국의과학학술지 Vol.10 No.-

Chronic eosinophilic pneumonia(CEP) is a rare disease of unknown etiology characterized by chronic infiltration of the lung with eosinophils. It presents with profound systemic symptoms comprising fever, night sweats, weight loss, dyspnea and blood eosinophilia with nonsegmental air-space consolidation confined to the outer third of the lung, the "photographic negative of pulmonary edema". Histopathologic features of chronic eosinophilic pneumonia are intraalveolar and interstitial infiltrations with eosinophils, histiocytes, giant cells, scattered lymphocytes and plasma cells. Glucocorticoid therapy cause prompt resolution of symptoms as well as disappearans of blood eosinophils, elevated serum Ig E levels and the roentgenographic lesions. Infrequent radiographic findings include nodular infiltrates, consolidations, cavitations, atelectasis and pleural effusions. Deaths from CEP although rare, have been reported, but the majorities of CEP have benign courses and do not need a therapy with ventilator. We report a case of chronic eosinophilic pneumonia, which had a sudden course associated with diffuse pneumonic consolidations on the both lung and bilateral pleural effusion.

열 변화에 의한 구리전선의 미세조직 및 상 변화에 관한 연구(Ⅲ)

박성우,김윤회,김상현,박남규,김수철,김영만 內務部 國立科學搜査硏究所 2002 國立 科學 搜査 硏究所 年報 Vol.34 No.-

알코올에 의한 α-Tocopherol이 혈중 Creatine kinase 활성도에 미치는 영향

김연선,이상한,김창세,조만희 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

This study was done in order to observe the effects of a-tocopherol and/or alcohol administration on the serum creatine concentration, creatine phosphokinase activity and CPK-isonzymes at each feeding day. The white Sprague-Dawley rats were classified with 4-groups : the 0.9% NaCl administration for the feeding days was group B(B1, B2 and B3), the 25% ethanol pretreated for the each 5 and 10 days and the 50% a-tocopherol for the 2 and 7 days administration was group C(Cl and C2), and the 50% a-tocopherol pretreated for the each ,10 and 16 days and 25% ethanol for the 2, 7 and 10 days administration was group D(D1, D2 and D3) The following results were obtained. 1. The serum creatine concentration was not significant. 2. The serum creatine activity was significantly increased in group B. The group C, and D was not significant. 3. The changes of electrophoresis pattern in serum CPK-isoezymes. CPK-BB and CPK-MB was significantly increased or decreased on the each feeding days, and however the CPK-MM was not significant.

연마된 단일 모드 광 섬유에서 외피 두께의 측정에 관한 연구

정만영,윤성현 동아대학교 공과대학 부설 한국자원개발연구소 1989 硏究報告 Vol.13 No.1

This paper studied cladding thickness that is the most important parameter when optical divices are fabricated with polished single mode optical fiber. When a drop of liquid with appropriate index oil is placed on the polished surface of the single mode optical fiber, guided mode of optical fiber is coupled in the liquid index oil. This coupling induces additional loss of the guided mode. These losses vary with the evanescent field in the cladding, and it is proportioned to thickness of polished cladding, so we can get cladding thickness by the measurement of loss, during optical fiber is polished.

Arabinoxylane과 PSP의 면역세포 활성화 효과, 항암 효과 및 알레르기 억제 효과 검증

배만종,이성태,신성해,채수연,권상호,박미현 경산대학교 생명자원개발연구소 2002 생명자원과 산업 Vol.6 No.-

The objective of the current study was to determine the effects of arabinoxylane and PSP on the immune cell functions. Arabinoxylane and PSP directly induced the proliferation of spleen cells in a dose-dependent manner. Stimulation of spleen cells with arabinoxylane and PSP resulted in increased IFN-γ synthesis. Especially, PSP induced IL-2, IL-4 and IL-10 production. Both arabinoxylane and PSP increased PFC(10∼15%) and RFC(10∼30%) formation. Arabinoxylane was not induced the proliferation of T cells, but PSP directly induced the proliferation of T cells in a high dose. Arabinoxylane and PSP increased the proliferation of B cells isolated from spleen cells. Stimulation of macrophage with PSP(20%) and arabinoxylane(22%) resulted in increased phagocytic effects. When arabinoxylane and PSP were used in macrophage stimulation, there was a marked induction of NO synthesis in a dose-dependent. Stimulation of macrophage with arabinoxylane and PSP resulted in increased TNF-α and IL-6 synthesis. Expecially, PSP also induced IL-1β production. When arabinoxylane and PSP were used in macrophage stimulation, there was induction of MHC class Ⅱ expression. The cytotoxic effect was revealed at 1 day in the 7 strains, and at 5 days in the 9 strains of cancer cell lines treated with arabinoxylane and PSP. There are some cancer cell lines treated with arabinoxylane and PSP was inhibited S and G2/M stage, but other cancer cell lines was not inhibited in the cell cycles. PSP feeding for 2 weeks significantly increased the cytotoxic effect of natural killer cells. PSP feeding for 2 weeks also significantly increased the cytotoxic effect of cytotoxic T cells. Both arabinoxylane and PSP induced the supressive effect in the mice with sarcoma-180 cell injected intracutaneously. When the mice injected intraperitoneal cavity with sarcoma 180 cells, survival ratio was increased in the mice fed on arabinoxylane and PSP. There was no difference in the ratio and kind of immune cells in the mice fed on arabinoxylane and PSP for 2 weeks. The ratio of PCA was slightly decreased in the mice fed on PSP, especially fed on arabinoxylane than in the control mice. The concentrations of blood histamine was slightly decreased in the mice fed on arabinoxylane and PSP. These results suggest that the capacity of arabinoxylane and PSP seem to act as a potent immunomodulator causing augmentation of immune cell activity, and with the absence of notable side-effects, arabinoxylane and PSP could be used as a biological response modifier having possible therapeutic effects against immunological disorders.

동물과 사람유래 Vancomycin 내성 장구균의 항균제 감수성 비교

조윤상,이희수,김종만,류판동,박용호,유한상,이문한 한국수의공중보건학회 2003 예방수의학회지 Vol.27 No.1

It has been recently reported the possibility in the bansfer of antimicrobial resistance to other animals and humans. In particular, vancomycin resistant enterococci (VRE), which have been known as a principal antimicrobial resistant bacteria in humans, have been increased as a pathogen of nosocomial infections. And then animal VRE were suspected as an origin of human VRE. In this study, we isolated Enterococcus spp. from animals, identified by bio- chemical tests, examined for antimicrobial susceptibility, and then compared the antimicrobial susceptibility of VRE among each other as well as human VRE. Enterococcus iecium (29%) was predominant in Enterococcus species (n=122) isolated from animal feces in this study. E. hirae, E. iecalis, E. casseliflam and E. gallinarum were also isolated as rates of 24%, 21%, 16% and 7%, respectively. The resistance of enterococci to penicillin and tetracycline were 66% and 78%, respectively, and the susceptibility of them to chloramphenicol was 66%. Antimicrobial susceptibility test has shown that 91% of VRE from humans (n=11) was susceptible to chloramphenicol and all resistant to penicillin, rifampin and streptomycin. Seventy-five percentage of VRE from chickens (n = 12) was susceptible to rifampin and resistances of them to penicillin, tetracycline and sbeptomycin were 75%, 83%, and l00%, respectively. Therefore, we confirmed the difference of antimicrobial susceptibility from animals and humans, and the antimicrobial susceptibility test could be one of the simple and useful methods for the epidemiological survey of VRE.

Random Amplified Polymorphic DNA Typing에 의한 동물과 사람 유래 Vancomycin 내성 장구균의 유전학적 비교

조윤상,이희수,김종만,류판동,박용호,유한상,이문한 한국수의공중보건학회 2003 예방수의학회지 Vol.27 No.1

It has been recently reported the possibility in the transfer of antimicrobial resistant to other animals and humans. In particular, the occurrence of vancomycin resistant enterococci (VRE), which have been known as a principal antimicrobial resistant bacteria in humans, has been increased as a pathogen of nosocomial infections. And then animal VRE were suspected as an origin of human VRE. In this work, we investigated the relatedness between VRE from animals and humans through random amplified polymorphic DNA (RAPD) typing. The genetic relatedness of vanA, vanB, vanC-1 and vanC-2 genotypes was examined by RAPD typing, respectively. van4 genotypes have not been shown high genetic relationship each other, containing VRE from humans (n = 8) and chickens (n = 5). In vanB genotypes from humans (n = 3), 2 isolates were made up one cluster, shown 77.8% homology. Chicken isolates of vanC-1 genotypes (n = 11) were constituted 2 clusters and the homology of 2 clusters was 81.8% and 80.0%, respectively. In case of vanC-2 genotypes (n = 19), 2 isolates from pigs have been shown 76.9% homology. But, between VRE from animals and humans, the isolates of high genetic relationship could not be found and RAPD typing was a useful epidemiological method that could be confirmed the genetic relationship among VRE.