CATV 망에서의 고속 DATA 서비스를 위한 적정 셀 규모에 관한 연구

정래성,구대성,김형준,김필중,김종빈 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2

Recently the surrounding of data communication industry has been changing through the rapid growth of the information technology, which has been sparked by the convergence of computer and optical fiber technology. This phenomenon requires broadband network to transmit video, audio and data at once. Multimedia and broadband services are provided widely over the Internet. The traditional telephone companies, CATV operators, and Internet service providers are all rushing to provide integrated services over their infra-structures. Among them, CATV seems to be the most promising from an economic perspective, because CATV infrastructure is already in place in a majority of homes and can deliver broadband service without requiring costly upgrade of the existing CATV systems. In this paper, analysis the problem of data services over CATV network, suggest size the proper cell for the high speed data services over CATV network.

고삼투압성 비케톤성 상태의 예후인자

안성훈,김양원,김미란,진헌철,안지영,이상래,류석용,김홍용,김성준,이병권,김경환 대한응급의학회 2001 대한응급의학회지 Vol.12 No.2

Background: A hyperosmolar nonketotic state has been known to have a high mortality, and even now, despite this high mortality, only a few studies of this disease have been performed. We studied the prognostic factors for the hyperosmolar nonketotic state. Methods: We retrospectively studied the cases of 40 patients who were in a hypersomolar nonketotic state when admitted to Sanggye Paik Hospital during the 6-year Period from 1995 through 2000. We divided the hyperosmolar nonketotic patients into two groups, the complete recovery group and the incomplete recovery group, and compared the clinical features, the laboratory findings, and the precipitating factors between two groups. Results: 1) A total of 40 patients were studied: 24 in the complete recovery group and 16 patients in the incomplete recovery group. The mortality rate was 32.5%. 2) No significant statistical difference existed among the clinical features of the two groups, except for the sex(p<0.01). 3) Among the laboratory findings of both groups, analysis revealed that the effective osmolarity was significantly higher among those in the incomplete recovery group(p<0.01). Serum sodium concentration was also significantly higher among those in the incomplete recovery group(p<0.01). Serum creatinine was also significantly higher among those in the incomplete recovery group(p<0.05). Serum bicarbonate concentration, on the other hand, was significantly lower among those in that group(p<0.05).4) Infection was identified as the most common precipitating factor(62.5%). Among the precipitating factors of the two groups, there were significant statistical difference in pneumonia, UTI, and inappropriate glucose control. 5) A significant statistical difference existed among the initial level of consciousness of both groups(p<0.05). 6) The only significant independent factor responsible for prognosis of nonketotic hyperosmolar state patients was the sex. Conclusion: The sex was only significant independent prognostic factor of nonketotic hyperosmolar state patients.

151종 생약제 추출물이 B형 간염 바이러스 표면 항원(HBsAg)과 항체(HBsAb)의 결합반응 그리고 HBV DNA polymerase 활성에 미치는 효과 : 한국산 각종 생약제를 이용한 B형 간염치료제의 개발

정태호,김정철,김문규,이인선,채성철,김승래,정준모,이인수,김승호,함경수 慶北大學校 醫科大學 1992 慶北醫大誌 Vol.33 No.3

세계인구 43억명 중 B형 간염 바이러스 보균자는 2억 1천 5백만명이며 이중 78%인 1억 6천만명 이상이 아시아 대륙에 집중되어 있다. 한국도 B형 바이러스 간염의 침윤지대이다. 본 연구는 B형 바이러스 보균자 혹은 만성간염을 치료할 수 있는 생약제를 탐색할 목적의 일환으로 한국에서 시판하는 생약제 151종을 구입하여 증류수로 추출하고 여과한 후 냉동건조하여 HBs 항원에 대한 결합능, HBV DNA polymerase억제능, tumor necrosis factor(TNF) 유리에 미치는 영향, 그리고 galactosamine 유발 간염에 대한간장보호 작용을 조사하였다. 151종의 생약제중 0.16㎍/㎖ 농도에서 간염 vaccine 내에 함유된 HBs 항원과 결합하는 생약제는 지유, 가자, 복분자, 대황, 정향, 빈량, 산수유, 소목, 마황, 쇄양, 후박, 목과, 양강, 오약, 산사, 목단피 등 16종이었다. 이들 생약제중 대황(Rheum palmatum L. 大黃), 가자(Terminalia chebula R. 訶子), 지유(Sanguisorba officinalis L. 地楡), 복분자(Rubus coreanus M. 覆盆子)는 HBV DNA polymerase 활성도를 비교적 강하게 억제하였으며 빈량(Areca catechu L. 빈랑), 정향(Eugenia caryophyllata T. 丁香), 목과(Chaenomeles japonica L. 木瓜), 산수유(Cornus officinalis S. 山茱萸)는 약하게나마 HBV DNA polymerase 활성을 억제하였다. 또한 HBV DNA polymerase를 억제한 대황, 가자, 지유, 복분자, 빈량, 정향, 마황, 소목, 산수유를 대상으로 TNF 유리에 미치는 영향을 조사한 결과 소목을 제외한 8종의 생약제 모두가 대식세포를 자극하여 TNF를 유리시켰다. 그리고 장차 임상에 사용함을 전제로 HBV DNA polymerase를 억제한 대황, 가자, 지유, 복분자, 빈량, 정향, 마황, 소목, 산수유를 galactosamine 유발 간염(백서)에 투여하여 간기능 검사에 미치는 효과를 조사하였으나 간기능 검사상으로는 특별한 보호작용을 나타내지 못하였으며 생약제 단독 투여로서는 간기능에 대하여 나쁜 영향을 주지 않았다. Hepatitis B virus infection is major cause of acute and chrome hepatitis, cirrhosis of liver, and hepatocellular carcinoma. There are over 200 million carriers of hepatitis B virus in the world, nearly 80 % of whom live in the South East Asia, Korea is also highly endemic area of hepatitis B virus infection. This study was performed to evaluate the effect of extracts of traditional Korean herbal medicines on hepatitis B virus. 151 traditional herbs were extracted, filtered and lyophilized. Using 151 herbal extracts we tested binding capability to the HBs Ag, inhibition of HBV DNA polymerase, release of tumor necrosis factor (TNF), and protection against galactosamine induced liver damage. Among 151 herbs, 16 herbs (Sanguisorba officinalis L., Terminalia chebula R., rubus coreanus M., Rheum palmatum L., Eugenia caryophyllata T., Areca catechu L., Cornus officinalis S., Caesalpinia sappan L, Ephedra sinica S., Cynomorium songaricum R., Machilus thunbergii S., Chaenomeles japonica L., Alpinia officinarum H., Lindera strychnifolia V., Crataegus pinnatifida B., Paeonia suffruticasa A. ) had binding capability to HBs Ag which contained in the commercial hepatitis vaccine, at 16 ug/㎖ of concentratioa Among the above 16 herbs, Rheum palmatum L., Terminalia chebula R., Sanguisorba officinalis L., Rubus coreanus M. significantly inhibited the HBV DNA polymerase activity, and Areca catechu L., Eugenia caryophyllata T., Ephedra sinica S., Caesalpinia sappan L., Chaenomeles Japonica L., Cornus officinalis S. also inibited the HBV DNA polymerase activity but less effective. All of the herbs, except Caesalpinia sappan L., which inhibited the HBV DNA polymerase activity, actively stimulated the mononuclear cells to release tumor necrosis factor(TNF) in whole blood culture system. The herbs which inhibited the HBV DNA polymerase activity, did not show any protective effect in galactosamine-induced hepatitis in rats, but there was no direct toxic effect when herbs were administered alone.

생리식염수 및 포도당수액 정액 투여가 에탄올 농도에 미치는 효과에 관한 연구

김원율,이상래,안지영,안성훈,류석용,김경환,김홍용 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3

Background: In emergency department, there are many drunken patients with various emergency medical situations. In these patients, evaluation and management of the medical problems are delayed from time to time because of the uncooperative nature of the patients and because of consciousness and sensory changes. A precise evaluation can only be obtained when the patients become sober. For this purpose, most clinicians start IV fluid loading. This study was carried out to evaluate the effect of IV fluid(normal saline and glucose solution) on the rate of ethanol clearance in such patients Methods: Ten volunteers(healthy males in their twenties and with a Michigan alcohol screening test below 4) were enrolled in this study. Alcohol intake was restricted to at least 48 hours before the test and food intake to at least 4 hours. For the test, A predetermined dose of ethanol(1 gm/kg) was given to the volunteers. Each volunteer was tested on three consecutive times with 3 or more days interval for alcohol wash out period . On the lst day, the volunteers received ethanol only per os. On the second day, they received ethanol and a liter of IV 10% dextrose solution. Each day, blood was drawn from the antecubital vein to measure the ethanol level at the time of ethanol ingestion and at 0.5, 1, 1.5, 2, 3, 4, 5 and 6 hours after ingestion. The repeated measure ANOVA test was used for the statistical analysis. Results: The difference in the blood ethanol level between the 3 test was F=1.7, p=0.184 and the difference corrected by the time factor was F=0.32, and p=0.985. Conclusion: There was no significant difference in the blood ethanol level between the tests. In conclusion, the IV normal saline or glucose solution does not accelerate ethanol clearance in suffering

아임계 및 초임계수하의 p-Xylene 의 무촉매 부분 산화반응에서 반응조건이 Terephthalic acid 의 선택성에 미치는 영향

김영래,김재덕,임종성,이윤우,이성철 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.1

아임계와 초임계수 매체하에서 p-xylene을 과산화수소에 의해 무촉매로 부분 산화시켜 terephthalic acid(TPA)를 제조하는가능성을 실험적으로 검토하였다. 회분식 반응실험을 통해 p-xylene의 새로운 산화 분해 경로를 제시하였다. 반응 시작 후 20분이 경과하였을 때 p-xylene의 전화율은 아임계수 조건에서 89.0% 이상이었고, 초임계수 조건에서는 99.0% 이상으로 온도가 높아질수록 증가하였다. TPA의 선택성은 초임계수 조건보다는 아임계수 조건에서 더 높았으며, 특히 온도 300 ℃, 압력 220 bar, 과산화수소 주입비 50%일 때 TPA수율은 29.0%로 최대값을 나타내었다. 또한 TPA 선택성에 미치는 압력의 영향은 초임계수보다는 아임계수 조건에서 더 큰 것으로 나타났다. The possibility of manufacturing the terephthalic acid(TPA) by partial oxidation of p-xylene without a catalyst in subcritical and supercritical water medium was investigated experimentally. The effects of reaction condition such as reaction temperature, pressure and hydrogen peroxide feed ratio on the conversion of p-xylene and the selectivity of TPA produced were investigated in batch reactor and new oxidation reaction pathway of p-xylene was proposed. Conversion of p-xylene was about 89.0% in subcritical condition and increased with the temperature increasing, over 99.0% in supercritical condition after 20 minutes from the start of reaction. The selectivity of TPA in subcritical conditions was higher than in supercritical conditions and the maximum value was 29.0% at 300 ℃, 220 bar, 50% H_2O_2 feed ratio. The pressure effect on TPA selectivity was higher at subcritical water condition than at the supercritical condition.

국제전립선증상점수와 요류속도 및 전립선용적과의 상관성에 대한 고찰

이상철,이형래,김용태,김원 大韓泌尿器科學會 1998 Korean Journal of Urology Vol.39 No.4

주행차량에 의한 강교량의 충격계수에 관한 연구

김상효,이상호,김방래 연세대학교 산업기술연구소 1996 논문집 Vol.28 No.1

In this study, a finite element program which can perform the dynamic analyses of bridges by considering the interaction forces between the bridge and moving vehicle is developed. The impact factors and dynamic behaviors of bridges according to the various parameters, such as speed and weight of vehicles, span length, damping ratio, girder spacing and transverse stiffnesses of bridges, are studied. The impact factor, in general, increases as the traveling speed increases, whereas the weight of vehicle does not affect the impact factor. The impact factor is larger in exterior girders than in interior girders. As the spacing between two girders increases, the impact factor decreases, and it is also affected by the lateral rigidities of the bridges. In addition, the impact factor is smaller in continuous bridges than in simply supported bridges.

기준타원체가 상이한 지도간의 정확도 비교

김감래,김명배,한상학 명지대학교 대학원 1999 대학원논문집 Vol.3 No.-

In order to obtain exact location information from the map which has different reference datum, we have to do coordinate transformation from other to reference coordinate system we use. In this paper, in order to evaluate accuracy between two maps have different ellipsoid, it is studied theory of map projection and coordinate transformation. Then, select maps about same area, select points which can be recognized on the maps for accuracy evaluation. After obtain coordinates about the points by TM projection and UTM projection, evaluated accuracy between TM coordinates, after to do Two-dimensional coordinate transformation, and after coordinate transformation from UTM to TM. As a result of this study, the maps which have different reference datum can be used if the exact transformation parameters can be obtained and applied.

민챙이(Bullacta exatrata)의 화학성분 연구

김인규,최병래,박선구,박성혜,명승운 성균관대학교 1990 論文集 Vol.41 No.2

한국 서해 상낙월도에서 채집한 연체 동물인 Bullacta exatrata 로부터 통상적인 9-hexadecenoic ethyl ester 이외에 불포화된 5, 8, 11, 14-eicosatetraenoic, 7, 10, 13-hexadecatrienoic, 10-13-octadecadienoic ethyl ester 및 상당량의 glyceryl ether인 chimyl alcohol이 검출되었다. 주 sterol 성분인 cholesterol이었으며 지방산 ester 형태로도 소량 존재하였다. Unsaturated 5, 8, 11, 14-eicosatetraenoic, 7, 10, 13-hexadecatrienoic, 10, 13-octadecadienoic ethyl ester and a lot of chimyl alcohol were isolated along with common 9-hexadecenoic ethyl ester from marine mollusca Bullacta exatrata collected from sangnackworl island of the Korea sea. In addition, cholesterol and its fatty acid ester were obtained by futher elution in more polar solvent. Their structures were deduced from ^1H-and ^13C-NMR, GC-ms, FT-IR spectra.

증기발생기 세관 와전류 탐상 신호해석을 위한 주성분 분석

김영환,송성진,김의래,임창재,김기복,최영환 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1

증기발생기(SG) 세관은 그 가동 특성상 결함이 발생할 가능성이 매우 높으며 이들의 건전성 확보는 원자력 발전소의 안전을 위해서는 필수적이다. 이들의 가동중검사에는 ECT가 널리 사용되고 있다. 본 연구에서는 bobbin coil probe를 사용한 원전 SG 세관 ECT신호를 해석하기 위해서 신경회로망을 이용하였다. ECT의 특징을 추출하였고, 이들 중에서 단일특징 분류성능을 분석하여 유용한 특징을 선택하였으며, 또한 주성분분석을 이용하여 유용한 특징들을 정의하였다. 이와 같이 정의된 특징들로 정의된 신경회로망을 학습시키고, 학습된 신경회로망으로 미지의 결함신호에 대해서 결함의 분류와 크기 산정을 수행하였다. 수치해석으로 만들어진 모사 ECT신호에 대해서 적용한 결과, 주성분분석으로 정의된 특징들을 사용하는 경우에 보다 적은 수의 특징을 사용함에도 불구하고 신호해석의 성능이 향상되었다. 따라서, 주성분 분석은 ECT신호와 같은 다변량 데이터를 처리하는데 매우 유용함을 알 수 있었다.