배수관망내 수압부족시 절점수요량의 변화에 대한 기초적 고찰

현인환,이상목,김영환,안용호 대한상하수도학회 2002 상하수도학회지 Vol.16 No.6

Pressure drop could happen in the water distribution systems due to pipe breaks or maintenance. The pressure drop causes the water service shutdown and nodal water demands should be reduced in some areas. The conventional analysis method of water distribution systems can not consider the change of nodal water demands caused by these pressure drops. This study is to investigate the variation of nodal water demands according to the nodal water pressure and its effect on the analysis of water distribution systems. For these purpose, one real water service district was selected as a study area. As a result, nodal water demand patterns according to the water pressure could be suggested. Also, we could confirm that the suggested new analysis method for the water distribution systems which considering water pressure drops could be more reliable than the conventional method.

잠김 금속판을 이용한 대퇴골 전자하 골절의 치료 : 압박 고 나사와 비교

손현철, 김용민, 김동수, 최의성, 박경진, 조병기, 박지강, 배승환 충북대학교 의과대학 충북대학교 의학연구소 2011 忠北醫大學術誌 Vol.21 No.2

-본문참고-

다분기 송수시스템의 설계용량 산정법에 관한 연구

현인환,민진호,이상목,이제인 대한상하수도학회 2003 상하수도학회지 Vol.17 No.6

This study is to evaluate the existing methods to determine the design capacity of the multi-branched water transmission systems. Three types of methods are generally used to determine the design capacity of water transmission systems. The first method is that total average day demand and peak factor of whole area is considered to estimate total maximum day demand, and then it is assigned to each pipe in the system. The second method is that total demand for each pipe in the system is calculated by adding up maximum day demand of each area. Because the calculation of design flow for each pipe is simple and convenient, this method is generally used for the design currently. The third method is that the each proper peak factor for each pipe in the system are estimated to predict maximum day demand of each pipe. In this study, two real water transmission systems were considered as study areas, and three methods were applied. The first method tends to underestimates the design capacities especially for branch pipes. On the other hand, the second method tends to overestimates the design capacities for most pipes. As a result, it is found that the third method generates most reasonable design capacities for each pipe. However, mass balance for the analysis of water transmission systems can not be satisfied automatically in the third method. Therefor, dummy nodal flows method are suggested to satisfy the Mass Balance Equations in this study.

인체 유방암종에서 Cyclic-Dependent Kinase Inhibitor, p27^Kip1 발현의 의의

송상용,김덕환,서연림,고영혜,김대식,남석진,양정현 대한병리학회 1998 Journal of Pathology and Translational Medicine Vol.32 No.12

등치관법이 배수관망 해석에 미치는 영향

현인환,이상목,김영환,전경호 대한상하수도학회 2002 상하수도학회지 Vol.16 No.5

In this study, the errors caused by improper application of equivalent pipe method on analysis of network were investigated. Especially, the errors related to selection of C-coefficients, pipe lengths, pipe diameters and flow rates were focused. To reduce errors caused by applying equivalent pipe method in network analysis, both C-coefficient of each parallel pipe and large flow rate variation in the parallel pipes between connected junctions should be considered. Results of this study are as follows. When the different C-coefficients of each parallel pipe was not considered, the application of equivalent pipe method caused 47.84% error in headloss and 24.75% error in pipe flow in model network. Also, When large flow rate variation existed in the parallel pipes between connected junctions, equivalent pipe method caused 51.61% error in headloss.

[논문]용접부의 피로 파손모드 평가에 대한 구조응력기법의 적용에 관한 연구

강성원,김명현,김정환 釜山大學校生産技術硏究所 2006 生産技術硏究所論文集 Vol.65 No.-

반복 하중을 받게 되는 하중전달형의 필릿 용접이음에서는 용접 토우부 뿐만 아니라 용입 부족부 선단에서도 응력집중을 일으키고 피로균열이 발생/ 전파하는 경우가 있다. 특히/ 용접 루트부에서 발생한 균열은 육안관찰이 불가능하고 초음파 탐상등에 의한 비파괴 검사에 의해서도 검출이 곤란한 경우가 많다. 이것은 중대한 손상을 일으키기 까지 방치되는 경우가 많기 때문에 용접 루트부에서 발생하는 균열에 대한 연구는 현재 활발히 진행되고 있다. 본 연구에서는 최근 유한요소 해석시 요소의 크기에 둔감하다고 알려진 구조응력 기법을 이용하여 용입 부족부를 가지는 하중전달형 필릿 용접부의 피로 파손모드를 평가하였다. 용접부 다리길이의 변화에 따른 사례 연구를 통하여 용접 루트부의 파손을 피할 수 있는 용접부 시공기준에 관한 연구를 수행하였으며 이에 대한 구조응력 기법의 적용 가능성을 검토하였다.

무증상 당뇨환자의 T 반사 변화

안규환,조용진,김상화,사은희,임용빈,김대성,정대수,박규현 대한신경과학회 1999 대한신경과학회지 Vol.17 No.5

臨床檢體에서 分離된 E. coli의 臨床細菌學的 調査硏究

申鉉成,吳是煥,李敏雄 대한화학요법학회 1986 대한화학요법학회지 Vol.4 No.2

A total of 25004 cases of clinical materials from patients was collected in H hospital from January 1974 to December 1984 in Seoul. Among the materials, 7773 cases of the clinical specimens were identified as pathogenic, organisms. The numbers of cases of E. coli isolated from the specimens were 1838 except for cases of incubation of human feces. Infectious pattern and antibiotics sencitivity of the pathogenic organisms and E. coli were as follows: Total clinical specimens, and isolation rate of E. coli from total clinical materials and to the identified pathogenic organisms were increased more than 2 times in 1982 to 1984 comparing to the year in 1974 to 1976. The range of percentage of all identified microorganisms to total clinical specimens was 27.0~34.6% yearly. Isolated ratio E. coli to total specimens was 7.4% and the ration of isolated E. coli to total isolated pathogens was 23.6%(1838/7773). The isolation ratio of E. coli per each patient was 1.323 for male and 1.21 for female. The isolation ratio-of male to female was 1 : 1.88. The highest number of E. coli was found in May for male and June for female according to monthly isolation. On the other hand the lowest number of E. coli was observed in February for male and October for female respectively. In seasonal fluctuation of the isolated orgainsms from patients specimens, the isolation rate was maximized in fall for male, and in summer for female, but the ratio was generally decreased in winter season. The age specific isolation rate of E. coli was 27.8% under 10 year old group for male and 27.1% in 20~29 year old group for female, but the frequency of the organisms was observed lower in 10~19 year old group in both sexes. The isolating sources of specimens in male were 41% in pus, 22.2% in urine and 20.1% in throat swab, and the sources in female were 59.7% from urine, 14% in pus and 11.3% from vaginal discharge. The susceptibility to antibiotics studied for 11 years was all less than 40% in streptomycin, cephalothin, chloramphenicol, carbenicillin, tetracyclin, ampicillin, erythromycin and penicillin except for 73.6% in gentamicin and 52.8% in kanamycin. But in the last 2 years, the antibiotics showing over 90% sensitivity against E. coli were cefotaxime, sisomicin, cefoxitin, amikacin and pipemidic acid.

한국인의 우울증 진단기준의 특성

장성만,손지훈,이준영,최지환,조성진,전홍진,함봉진,이동현,조맹제 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.5

목적 국내의 여러 역학 조사에 따르면 한국인은 서구에 비하여 우울증의 유병률이 낮은 것으로 보고되고 있다. 낮은 유병률에 대하여 서구에서 정의하는 우울증의 진단 기준이 한국인의 문화에 맞지 않다는 진단 기준의 오류를 제시하거나, 실제로 유병률이 낮다는 설명을 시도하기도 하였다. 본 연구는 DSM-IV에서 제시하는 우울증의 진단 기준에 대하여 한국인의 반응 특성을 알아보고자 한다. 방법 2001년 KECA 연구에 응답한 만 18세 이상 65세 미만의 6,275명을 대상으로 하였다. 한국어판 CIDI (K-CIDI)를 통해 정신장애의 이환을 진단하였으며, K-CIDI 내의 우울장애 진단 기준만을 추출하여 분석하였다. 분석은 문항반응이론(Item Response Theory)을 적용하였다. 결과 한국인에서 DSM-IV의 주요우울장애 진단 기준의 오류는 없었으나, 진단 기준의 역치는 높았다. 한국인이 호소하는 우울증상으로서 "피로감"과 "집중력 저하", "수면 변화"는 진단되는 우울증의 초기부터 잘 나타나는 증상 들이며, "정선운동변화", "죽음/자살사고", "무가치함/죄책감"은 보다 심한 우울증에서 잘 나타나는 증상들이었다. 결론 DSM-IV가 제시하는 주요우울장애 진단 기준은 한국인의 우울증을 평가하는 데 있어 타당하기는 하나, 진단 기준의 역치가 높다. 우울증의 중증도에 따라 호소하는 증상들이 달랐다. Baekgrounds : Many Korean epidemiologic studies reported lower prevalence rates of depression than those of Western countries. For the low prevalence, it is explained that there's something wrong in the direct application of diagnostic criteria of depression to Korean culture, i.e. categorical fallacy, or it may be truly low-prevalent. We will analyze diagnostic criteria for depression detined by Western. Methods : Six thousand and two hundred seventy-five cummunity dwelling subjects, aged 18-64 years were interviewed by using Korean version of Composite International Diagnostic Interview (K-CIDI). Diagnostic criteria for depression defined by DSM-IV were analyzed using the item response theory. Rcsults : We could not find any fallacies of diagnostic critcria tbr depression defined by DSM-IV when assessing depre-ssion among Koreans. Fatigue, concentration difficultics, and sleep disturbance appeared more fequently in mild depression, while psychomotor change, death/suicide, and worthlessness/guilt did not appear until severe depression. Cunclusion : The diagnostic criteria for depression defined by DSM-IV arc appropriate for the Koreans. There are different responding levels, i.e. threshold, of depressive criteria according to severities of depression. Koreans with depression are more likely to complain of appetite change, but less of worthless or guilty feelings than Western people.

파킨슨씨병 환자에 있어서 자가부신수질 이식술

정상섭,박상근,오성훈,김선호,윤도흠,박정수,양우익,최인준,안영수,김경환,박창일,김진수,이현철 대한신경외과학회 1988 Journal of Korean neurosurgical society Vol.17 No.6

Recent experimental studies and clinical cases have suggested that grafting tissue from the adrenal medulla into the brain may alleviate the symptoms of Parkinson's disease. Autologous adrenal medullary grafts into the striatum was performed stereotactically in two patients with Parkinson's disease. Both patients were bedridden preoperatively, but 4 months after the surgery both became ambulatory and one was even capable of returning to his job. Even though the number of cases was small⑵ and the follow-up period was short, this study shows that adrenal medullary transplantation into the striatum may have some beneficial effects in patient with Parkinson's disease. Further experimental and clinical trials are necessary to see whether this procedure will be a recommendable surgical treatment for patients suffering from Parkinson's disease.