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LCFQ ( Linear Clock Fair Queueing ) 알고리즘의 설계와 성능 분석
김영한,이재용,Kim, Young-Han,Lee, Jae-Yong 대한전자공학회 1999 電子工學會論文誌, S Vol.s36 No.1
종합 서비스망에서, 트랙픽을 발생시키는 각각의 플로우에 대하여 QoS(Quality of Service)를 적절하게 제공하기위해서는 호스트와 라우터에 자원 예약뿐만 아니라 효율적인 트랙픽 스케쥴링이 채택되어야 한다. 본 논문에서는 가상시간이 선형적으로 증가하는 새로운 페어 큐잉 알고리즘에 제안한다. 본 논문에서 제안된 알고리즘은 각 플로우에 대하여 기존의 SCFQ(Self-Clocked Fair Queneing) 알고리즘과 유사한 구현 복잡성을 갖으면서 더 감소된 최대 지연와 평균 지연시간을 제공하고 공평성 측면에서도 개선됨을 보여준다. 또한 자신에게 할당된 대역폭보다 더 많은 트랙픽을 발생시키는 플로우에 의해 다른 플로우는 영향을 받지 않도록하는 독립성 특성 또한 SCFQ보다 더 좋은 성능을 보인다. 본 논문에서는 제안된 알고리즘에 대한 공평성을 증명했고, 최대지연과 평균지연시간에 대한 시뮬레이션 결과를 나타냈다. In order to provide appropriate Quality of Service(QoS) guarantee to each traffic flow in intergrated service networks, an efficient traffic scheduling algorithm as well as resource reservation must be adopted in host and transit routers. In this paper, a new efficient fair queueing algorithm which adopts a linearly increasing virtual time is presented. The proposed algorithm is fair and the maximum and mean delay guaranteed of each flow are less than those of the SCFQ(self clocked fair queueing) algorithm which is one of the most promising traffic scheduling algorithm, while providing low implementation complexity as the SCFQ scheme. And, it has the better isolation provided than SCFQ, which means that each flow is much less influenced by the violating traffic flows provided its allocated bandwidth gurantee. The fairness of the proposed algorithm is proved and simulation results of maximum and mean delay presented.
정상 산모와 전자간증 산모의 태반에서 Adenosine 수용체의 발현 양상
김영한 ( Young Han Kim ),조남훈 ( Nam Hoon Cho ),황한성 ( Han Sung Hwang ),권자영 ( Ja Young Kwon ),강명화 ( Myoung Hwa Kang ),박용원 ( Yong Won Park ) 대한산부인과학회 2007 Obstetrics & Gynecology Science Vol.50 No.5
Objective: The aim of the study was to investigate the differential expression of adenosine receptors (ADORs) in the normal and preeclamptic placenta. Methods: Placentas were obtained from women undergoing cesarean section with normal and preeclamptic pregnancies at term. Total RNA was reverse transcribed using ADORs gene specific primers. RT-PCR measurements were made semi-quantitatively. Western blot analysis was performed for protein quantitation. Immunohistochemical staining with anti-adenosine receptor antibodies were employed to localize adenosine receptors in placental tissues. Results: RT-PCR revealed that A2aR, A2bR, and A3R mRNA, not A1 receptor mRNA were expressed in both normal and preeclamptic placenta. Interestingly, there were somewhat higher expressions of A2aR, A2bR, and A3R mRNA in preeclamptic placenta than in normal placenta. Western blotting revealed that A2a, A2b, and A3 receptors were all present in the placental tissue as verified by immunoreactive protein bands. The bands for the A2a, A2b, and A3 receptors were stronger in preeclamptic placenta than in normal placenta. A2a and A2b receptors were detected in endothelial cell, whereas we could not find the staining for A3 receptor in endothelial cells. Importantly, A3 antibody had high intensity of staining in trophoblasts in preeclampsia. Conclusion: To our knowledge, this study is the first to evaluate the expression of ADORs in normal placenta, and to compare ADOR subtypes in normal versus preeclamptic placenta. This study suggests that the specific subtype of ADORs may have a role in the development of preeclampsia.
산전 초음파 소견상 단독으로 관찰되는 대조 확장의 임상적 의의
김영한(Young Han Kim),권혜경(Hye Gyung Gwon),이창희(Chang Hee Lee),강지용(Jee Yong Kang),조재성(Jae Sung Jo),박용원(Yong Won Park) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.12
Objective : To assess the clinical significance of isolated enlargement of the cisterna magna and to help obstetrician in further management. Methods : All prenatal sonography was reviewed, which was performed from 1996 to 1999. Prenatal sonographic findings and medical records of pregnant women and their babies were analyzed in 15 cases with regular antenatal care and delivery results at Severance hospital, out of 25 cases with isolated enlargement of the cisterna magna. Results : The mean maternal age was 29.2 years and the mean gestational weeks at diagnosis was 30 weeks. 5 cases were diagnosed during the 2nd trimester, 10 cases during the 3rd trimester. 13 cases were found before 32 gestational weeks. Prenatal cytogenetic study was made in 2 cases, of which results were normal. 12 fetuses were male and 3 female, showing male predominance. APGAR score after birth was good and phenotypic evidence of aneuploidy was not observed in all cases. Postnatal follow-up could be done in 7 cases, during which delayed development and neurological abnormality was not found. Conclusion : Our data demonstrate that it is important to assess other findings of chromosomal abnormality by performing detailed prenatal ultrasonography and that prenatal cytogenetic study and postnatal follow-up may be unnecessary in cases with isolated enlargement of the cisterna magna.
김영한(Young Han Kim),권혜경(Hye Gyung Gwon),이창희(Chang Hee Lee),강지용(Jee Yong Kang),조재성(Jae Sung Jo),박용원(Yong Won Park) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.12
Objective : This study is directed to analyze clinical outcome of fetuses that showed mild ventriculomegaly on prenatal sonography, thus aiding prenatal care, consultation, and further management of such patients. Method : All prenatal sonographic findings from 1996 to 1999 were evaluated. Mild ventriculomegaly of 10-15mm were observed in 60 cases, but only 31 that received continuous prenatal care and underwent delivery in our hospital were studied, whose cases were divided into two groups. The 1st group showed isolated mild ventriculomegaly(IMV, n=21). The 2nd group had mild ventriculomegaly with associated other anomalies(AMV, n=10). Prenatal sonographic findings and medical records of each group were compared and analayzed. Results : In each group(IMV : AMV), the mean maternal age(years; mean±S.D.) was 30.2±3.3 : 28.5±2.5(p=0.139), the gestational age at diagnosis(weeks; mean±S.D.) 27.8±4.3 : 28.3±5.3(p=0.784) and the cephalic index(mean±S.D.) 74.7±5.0 : 74.2±8.9(p=0.87). No statistically significant differences between the two groups were noted. Male babies predominated in the IMV group(61.9%). And resolution in utero was noted in 13 out of those cases. In the IMV group, those with mild ventriculomegaly≥12mm more frequently accompanied delayed development after birth(2/5) than those〈12mm(1/16). Mild ventriculomegalies≥12mm were more frequent in the AMV(8/10) than in the IMV(5/21), of which finding was statistically significant(p=0.003). Conclusion : Fetuses with mild ventriculomegaly≥12mm on prenatal sonography could be predicted to have relatively high risk of delayed development after birth and associated anomalies. Detailed ultrasonography is necessary to determine the presence of other anomalies in cases with mild ventriculomgaly. If isolated, periodic ultrasonography and consultation are requested. Thereafter, More cases with longer periods of follow-up should be evaluated.
유용균(Yong Gyun Yoo),김재욱(Jae Wook Kim),김세광(Sei Kwang Kim),김영한(Young Han Kim),연정은(Jung Eun Yeon),손용석(Yong Seok Sohn),정영내(Young Nae Jung),이윤정(Yun Jung Lee) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.3
The etiology of neural tube defects, a category encompassing spina bifida, anencephaly and encephalocele, remains highly controversial and unclear, However, there is overwhelming evidence supporting a multifactorial etiology for this group of defects. Recent studies have shown that folic acid supplements taken periconceptionally can reduce a woman's risk of having a child with a neural tube defect. Qenetic screening could identify women who will require folic acid supplements periconceptionally to reduce their risk of having a child with a neural tube defects. Recently, we encountered two cases of recurrent anencephaly that had occurted in a same pregnant woman in our hospital. We report these two cases with brief review of the literatures.