로컬 QoS 라우팅을 위한 경로선택 알고리즘

서경용 대한전자공학회 2003 電子工學會論文誌-TC (Telecommunications) Vol.40 No.12

최근에 글로벌 QoS 라우팅방식의 약점을 개선하려는 노력으로 로컬 QoS 라우팅 방식이 제시되었다. 글로벌 라우팅과는 다르게 로컬 QoS 라우팅에서는 라우터간의 상태교환을 수행하지 않고 virtual capacity를 사용하여 라우터가 독자적으로 라우팅을 수행한다. 로컬 QoS 라우팅에서는 소스와 목적간의 경로가 효과적으로 선택되어야만 좋은 성능을 보장받을 수 있다. 본 논문에서는 효과적인 경로 선택을 위하여 몇몇의 휴리스틱을 제시하고 이를 활용한 경로 선택 알고리즘을 제안하였다. 제안된 알고리즘은 시뮬레이션과 함께 분석되었으며 경로선정방식에 따라 로컬 QoS 라우팅의 성능이 매우 큰 영향을 받는다는 것을 확인하였다. Recently, localized QoS routing scheme was recently proposed for overcome drawbacks of global state QoS routing schemes. Localized QoS routing dose not exchange QoS states among routers, but use virtual capacity based routing scheme instead. In localized QoS routing, to archive good performance, a set of candidate paths must be selected between the source and the destination effectively. In this paper we propose a few heuristics for effective path selection and develop path selection algorithms based on the heuristics. More detail analysis of the proposed algorithm is presented with simulation results which demonstrate that the path selection method can very affect the performance of localized QoS routing.

포스타 : 일반부인과학 ; 자궁외 임신의 조기진단을 위한 단일 혈청 프로제스테론(Progesterone) 측정의 효율성에 관한 연구

서경용,최두석,윤병구,이제호 대한산부인과학회 1995 대한산부인과학회 학술대회 Vol.76 No.-

時代의 徵表

徐炅龍(서경룡) 광주가톨릭대학교 신학연구소 2000 神學展望 Vol.- No.128

최근 임산부에서의 풍진면역항체 보유율에 관한 조사연구

심재식,노인화,서경용,오주환,민지영,박창민,고일영 대한산부인과학회 1996 Obstetrics & Gynecology Science Vol.39 No.9

Objective: To assess the rubella specific immune status of a group of Korean pregnant women. Methods: Between June 1995 and May 1996, the seroprevalence of rubella was determined in the study group that consistss of 132 pregnant women who had visited Korea Veterans Hospital in Seoul for prenatal care. We checked the rubella specific IgG and IgM antibody titer of the womens sera by ELISA. We also asked the past history of the rubella infection, rubella vaccination, parity, womens age and gestational age. Results: A total of 19(14.39%) pregnant women were found to be susceptible to rubella infection and the seropositive rate was 85.61% in them. And mean IgG antibody titer was 53.40 IU/ml. And, IgM positive rate was 0.81%, negative rate was 99.19% and mean titer was 2.97 aU/ml. Among them there were no one who had taken vaccination and no one suffered from rubella infection. And, there were no statistically significant differences of IgG positive rate according to age, gestational age and parity. Conclusion: With such a high susceptibel density of pregnant women in comparison to developed countries, the vaccination against rubella should be enforced more actively in order to prevent possible outbreaks of the congenital rubella syndrome.

Cisplatin이 흰쥐 신장에서의 hydroxyl radical 생성과 지질 과산화에 미치는 영향

서대규,신인철,서경용,고현철,하경란 한양대학교 의과대학 1994 한양의대 학술지 Vol.14 No.1

Cisplatin(cis-diamminedichloroplatinum Ⅱ) is a chemotherapeutic agent which is important in the treatment of several human cancers. The major limitation in the use of cisplatin is nephrotoxicity which may occur acutely or after several courses of treatment. THe mechanism of cisplatin nephrotoxicity is unknown. For the determination of the role of free radical in cisplatin-induced nephrotoxicity, we examined the effects of cisplatin on the activities of catalase and content of malondialdehyde(MDA) in rats. The Wistar rats(n=40), weighing about 200gm, were injected intraperitonealy with a single dose of cisplatin(6mg/kg). The rats were decapitated and the left kidney were perfused with an ice cold phosphate buffered saline(pH 7.3). The renal cortex was separated mudullar from the kidney and homogenized in a 10mM potassium phosphate buffer(pH 7.3) and then the cell membranes were disrupted by sonication. THe catalase activity was determined by the method of Cohen which involves titration of KMnO₄and the MDA contents were determined by the method of thiobarbituric acid assay. The catalase activity and the MDA contents were expressed on a mg protein. The results obtained were as follows. 1.Catalase activity(k/mg protein) In control group(n=5), the catalase acivity(means±S.D.) resulted in 43.80 4.26 and the catalase activity of group treated with cisplatin(n=15) was increased 10.1% at the 1st day but decreased 60.4 and 39.8%(p<0.01) respectively on the 2nd day and the 3rd day after the injection as compared with the catalase activity of control(p<0.01). 2.Malondialdehyde(MDA) content(nmol/mg protein) In control group(n=5), MDA content(means±S.D.) resulted in 2.11±0.35 and significantly the content of groups treated with cisplatin("n=15) increased 46.4(p<0.05), 20.9, 35.1%(p<0.01) respectively on the 1st, the 2nd, the 3rd day after the injection as compared with MDA content of control. These results suggest that hydroxyl radicals are involved in pathogenesis of cisplatin-induced nephrotoxicity.

중증 임신오조에 합병된 Wernickes Encephalopathy 1 예

심재식,노인화,서경용,박창민,고일영,정창호,송진범 대한산부인과학회 1998 Obstetrics & Gynecology Science Vol.41 No.10

임신오조는 체중감소, 산-염기, 수분, 전해질의 불균형을 초래한는 심각한 상황으로 적절한 수액과 영양분의 공급이 되지 않으면 심각한 합병증을 초래하게 된다. 본 저자들은 임신오조에 합병되어 발생한 Wernicke 뇌병변 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Hyperemesis Gravidarum is definied as vomiting sufficiently pernicious to produce weight loss, dehydration, acid-base imbalance, electrolyte imbalance. In severe cases, it also leads to neurologic abnormality including confusion, gate disturbance, nystagmus, due to thiamine deficiency known as Wernickes encephalopathy. We have experienced a case of Wernickes encephalopathy associated with hyperemesis gravidarum and reviewed the Wernickes encephalopathy and new aspects of hyperemesis gravidarum.

폐경전 여성에서 자궁적출술 시행시 난소 보존여부와 관련된 비만의 관계

심재식,노인화,서경용,민지영,박창민,고일영,정창호 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.8

Objectives:To determine if hysterectomy with or without ovarian preservation is asso-ciated with obesity in premenopausal women. Methods:581 women for routine check up from Jan. 1985 to Dec. 1995 in the depart-m ent of Gynecology at Korea Veterans Hospital were included. The obesity was evaluated by BMI(body mass index) scores. 80% of hysterectomy were confirmed from the hospital records. The age, weight, height, blood pressure, menstr- ual history, history of DM and hypertension, social history of alcohol and smoking and other cardiovascular risk factors such as cholesterol, HDL-cholesterol, triglycerides were checked. The 248 women with natural postmenopausal status before hysterectomy, taking hormonal replacement therapy after hysterectomy and having performed hysterectomy due to malign- ancy were excluded. Results:All women performed hysterectomy were in premenopausal status in this study. Therefore, the final numbers of subjects included in the analysis was 333. Hysterectomy wit- hout ovarian preservation were performed in 58 cases and hysterectomy with ovarian pres- ervation were in 57 cases. The 218 premenopausal cases which did not performed hystere- ctomy were considered control group. BMI scores were higher in cases without ovarian pres- ervation than with ovarian preservation. And BMI score was associated with the postoper- ative duration in hysterectomy with ovarian preservation. Conclusions:We suggest that hysterectomy without ovarian preservation in premeno- paussal women were associated with increased obesity, especially BMI scores.

자궁근종환자에서의 골 밀도와 혈중 지질 동태에 관한 연구

신경자,서용수,최두석,윤병구,서경용,이재호 대한폐경학회 1996 대한폐경학회지 Vol.2 No.2

To testify the hypothesis that BMD and serum lipid profiles might be different in women with leiomyoma, estrogen-dependent tumor, retrospective study was perfarmed in healthy women who visited Health Promotion Center in Samsung Medical center. One hundred sixty-one women with leiomyoma diagnosed by pelvic ultrasound examination were compared with 315 women with normal uterus. All women were divided into 3 groups accarding to serum FSH levels(mIU/ml)-group 1: FSH$lt;20, group 2: 20≤FSH$lt;35, group 3: FSH≥35. BMD tends to be higher in patients with leiomyoma than control. In group 1, women with leiomyoma showed higher femur BMD at trochanter and Ward's triangle(p$lt;0.05). Serum lipid profiles also seemed to be better in leiamyoma patients higher total and HDL cholesterol levels in group 1, elevated HDL cholesterol concentrations in group 2, and lower LDL cholesterol levels in group 3(p$lt;0.05). These data suggest that estrogen-sensitive markers such as BMD and serum lipid profiles tend to be improved in women with leiomyoma compared with control. A hyper-estxogenic state co-existing with leiomyoma might contribute to these differences. $quot;

자궁외임신의 조기진단을 위한 혈청 황체호르몬 일회 측정의 효율성에 관한 연구

이제호,윤병구,최두석,서경용 대한산부인과학회 1996 Obstetrics & Gynecology Science Vol.39 No.9

In order to evaluate the usefulness of single measurement of serum progesterone concentration in the differentiation of normal intrauterine and ectopic pregnancies, 106 patients(30 of pathologically proven ectopic pregnancies and 76 of normal intrauterine pregnancies) were analyzed. Serum progesterone levels were measured during 4-8 gestational weeks in normal intrauterine and in ectopic pregnancies preoperatively. The serum progesterone levels did not change significantly during early normal pregnancies. The serum levels(ng/ml, Mean±SEM) of progesterone with ectopic pregnancies(7.54±1.05) was significantly lower than that measured in intrauterine pregnancies(21.81±0.72, p$lt;0.05). Especially in early pregnancies with serm B-hCG$lt;1,000 mlU/ml when gestational sac is usually invisible by ultrasound examination, serum progesterone level with cut off value of 15 ng/ml can differentiate intrauterine from ectopic pregnancies with a very high sensitivity(100%). In conclusion, single measurement of serum progesterone level in early pregnancy deserves a additional diagnostic labaratory tool for the earlier detection of ectopic pregnancy.

골반경수술 90예에 대한 고찰

박종성,김미령,윤호주,이경범,서경용,정좌구 한림대학교의료원 1996 人間科學 Vol.20 No.2