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ATM 망에서 다중 멀티캐스팅 서버를 이용한 통합된 그룹 통신 플랫폼 구현 (pp.544-551)
정창수(Chang-Su Jung),변태영(Tae-Young Byun),김민수(Min-Su Kim),한기준(Ki-Jun Han) 한국정보과학회 2000 정보과학회논문지 : 정보통신 Vol.27 No.4
본 논문은 ATM망에서 다중 그룹 통신 서버를 이용하여 다양한 멀티캐스팅 응용 서비스를 지원할 수 있는 통합된 그룹 통신 플랫폼의 설계 및 구현 내용을 기술하였다. 본 논문에서 구현한 플랫폼은 단일 그룹 통신 서버에서 발생할 수 있는 트래픽 부하로 인한 병목현상을 줄이기 위해 다중 그룹 통신서버 구조를 가지며, 테스트를 위하여 멀티캐스팅 응용 서비스를 통하여 올바른 동작을 검증하였다. 이 플랫폼은 하부 ATM망을 기반으로 하여 TCP/IP 프로토콜 및 Native ATM 프로토콜 상위에서 동작하여 다양한 멀티캐스팅 응용 및 서비스를 효과적으로 지원할 수 있다. In this paper, we describe our work for design and implementation of Unified Group Communication Platform which can support various multicasting application services using multiple multicasting servers over ATM Networks. The architecture of this platform consist of multiple group communication servers to reduce bottleneck occurred in single communication server. We utilized multicasting application programs for verifying correct operation of this platform. This platform operates in both TCP/IP protocol and Native ATM protocol based on ATM Networks and can support various multicasting applications and services effectively.
태아발육지연 임신에서 산소농도가 영양배엽세포의 telomerase 활성도에 미치는 영향
정영내(Young Nae Jung),김세광(Sei Kwang Kim),정현철(Hyun Cheol Chung),박규현(Kyu Hyun Park),김창한(Chang Han Kim),장영건(Young Kwon Chang),권자영(Ja Young Kwon),김성훈(Sung Hun Kim),노성일(Sung Il Roh),조동제(Dong Jae Cho) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.8
N/A Objective : To observe the difference in telomerase activity (TA) expression in the placenta between fetal growth restriction (FGR) with preeclampsia and those without and to evaluate the effect of oxygen concentration on the TA expression in the trophoblastic cells. Methods : Telomerase activity was measured in 48 (normal pregnancies, 16; preeclampsia with FGR, 15; normotensive FGR, 17) placentas which were obtained between 32 and 41 weeks' gestations. Trophoblastic cells were extracted from 8 chorionic villi samples obtained from 8-10 weeks' placenta and were cultured in either 2%, 8%, and 20% oxygen atmosphere. Then TA was examined by using telomeric repeat amplification protocol (TRAP) assay. Results : During 3rd trimester of pregnancy, exhibited TA expression in normal pregnancy, FGR complicated by preeclampsia, and normotensive FGR groups were 11 of 16 (68.8%), 4 of 15 (26.7%), and 4 of 17 (23.5%), respectively. Significantly lower level of TA was detected in the FGR group compared to the normal pregnancies (p=0.009), whereas within FGR pregnancies, presence of preeclampsia did not seem to have statistically significant effect on TA expression. TA expression levels were measured by optical density in trophoblasts cultured under various oxygen concentration which revealed that significantly higher TA was exhibited in the cells cultured in 2% oxygen compared to 8% and 20% (p<0.001). However no significant difference was noted in TA between cells cultured in 8% and 20% oxygen. Conclusion : Decreased TA in the placenta from pregnancies with FGR was noted regardless of presence of preeclampsia indicating a probable correlation between FGR and placental senescence. Since increased TA was noted in trophoblastic cells that were cultured in hypoxic condition, we could speculate that the intervillous oxygen tension during early-stage placental development plays a certain role in the placental degeneration in pregnancies complicated by FGR and preeclampsia.
사염화탄소에 의해 유발된 간독성에 대한 galangin의 보호효과
정배동(Bae Dong Jung),김천호(Cheon Ho Kim),김정한(Jung Han Kim),허문영(Moon Young Heo) 대한약학회 1996 약학회지 Vol.40 No.3
In order to evaluate the protective effects of galangin on CCl4-induced hepatotoxicity, GOT, GPT and malondialdehyde(MDA) values were measured in ICR mice. Galangin,a flavonoid compound, was administered orally for six days and immediately CCl4 was injected intraperitoneally after the last dose of galangin. Mice were sacrificed at 24h after the administration of CCl4. In the multiple pre-treatments for 6 consecutive days, galangin showed more potent protective effects than silymarin as reference active compound in serum GOT, GPT and MDA values in the liver at all doses tested. Antioxidative activity was determined by measuring the amounts of MDA formed from ethyl linoleate by H2O2 in vitro. Galangin showed higher inhibition than silymarin. These results demonstrate a possible hepato-protective role of galangin against CCl4-induced hepatotoxicity in vivo and H2O2-induced lipid peroxidation in vitro. Therefore, galangin may be capable of protecting hepatotoxicity.
시설물 유지관리를 위한 IT 지향적 프레임워크의 개발에 관한 기초적 연구
정영한(Jung Young-Han),황영삼(Hwang Young-Sam),박태근(Park Tae-Keun) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.2
This research shows the preservation administration framework which is conceptualized by link of development of IT solution for the preservation administration of facilities.<br/> Also, the preservation administration framework to propose is general. That is, it is not subject to restriction of administration formation's scale which apply variety of examined property type or scale of equipment administration project or framework. Framework can act in general policy guide line to execute preservation administration within organization which attend to government official of various property set.<br/> Framework would make a standard of process techniques, process activities, and information and method to interchange each activity. In addition to, the update of knowledge would be possible to establish new logical process about these process and activity and to adjust the integration through new administration process or activity if framework's structure would be soft and substantial.
정재한,선종주,민인규,김미영,최원우,홍진우,나병조,정우상,문상관,조기호,김영석,Jung, Jae-Han,Sun, Jong-Joo,Min, In-Kyu,Kim, Mi-Young,Choi, Won-Woo,Hong, Jin-Woo,Na, Byong-Jo,Jung, Woo-Sang,Moon, Sang-Kwan,Cho, Ki-Ho,Kim, Yong-Suk 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.4
Objectives : This study investigated stroke lesions and their relationship with warning signs and risk factors in stroke patients. Methods : Three hundred fifty-three stroke patients were recruited at the Department of Cardiovascular and Neurologic Diseases (stroke center) of Kyung Hee University Oriental hospital from October 2005 to July 2007. We evaluated their stroke lesions with brain MRI, their warning signs, and risk factors. Results : 353 subjects were included in the final analysis. The frequency of diabetes was found more in presence of brain stem lesion than without. The cortex lesion showed a close relationship with smoking, drinking and the frequency of one side paralysis or weakness. These were more common in males than in females. Conclusions : We observed stroke lesions and their characteristics in stroke patients. The subjects' brain lesions seemed affectedby the risk factors. A concrete conclusion can hardly be drawn from this study; additional research is necessary.