선행강우지수를 고려한 저수유출해석

許彰桓,金知學 충주대학교 산업과학기술연구소 2002 産業科學論文集 Vol.10 No.-

This study is aimed at the development of a deterministic runoff model which can be used for low flow runoff. The model is formulated by the watershed runoff model. Based on the assumptions that runoff system is nonlinear, the proposed watershed runoff models are the conceptual model and tank model. In the model structures, the conceptual and tank model divide the runoff system into a surface structure and a subsurface structure corresponding to the surface flow, and inter flow and ground water flow respectively. The lag time effect of surface can be represented by the sub-tank of surface structure in the conceptual model and by the 2rd-tank in the tank model. The parameter calibration of inter flow and ground water flow in the subsurface structure of the conceptual model is made by separating the components with numeric filter. The runoff coefficient(α_2, K_1) is expressed as the function of antecedent precipitation index(API) in the conceptual and tank model. The parameters related to the surface flow can be calibrated with the runoff coefficient(α_1, α_11, C1, C2) in the conceptual and tank model. In the conceptual and tank model an algorithm are developed to calibrate the parameters automatically based on efficiency criteria. The tank model shows more closely to the observed hydrograph than conceptual model.

환경보고서의 유용성에 대한 이용자의 인식에 관한 설문조사연구

장지인,김장환,정혜정 대한경영학회 2003 大韓經營學會誌 Vol.16 No.7

This study will develop the way of working out the more useful environmental report based on the result of the survey which was carried out in the companies currently publishing the report(publisher) and stakeholder(report user). At present, the number of domestic company which publishers the environmental report is quite few, however, its number will be expected to reach high in near future in the light of its importance. In the survey of usefulness of those environmental reports, 24 out of 25 report publishers and 18 out of 22 report users answered "useful". However, both of publishers and users pointed out the various points at issue of their points of views when they wrote and used the reports. First of all, the publishers usually make out the environmental reports based on the guideline out of the Ministry of Environment which is official recognized standard to help the publishers the consistency of the report and easiness of making out. However, the publishers also indicate controversial points of impeding the publisher's creativity due to its too much generalization. The users of those environmental reports present the problems of the impossibility of making comparison between entities due to the difficulties of the substance of the report, credibility of its objectivity and confidence, and lack of unified formation of report. The result of this survey is expected to be good reference for the development of the environmental report.

중소하천유역에서 개념적 유출모형의 민감도 분석을 통한 매개변수 추정기법의 비교

김지학,허창환,최윤영 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.2

A Sensitivity analysis on the model parameters involved in the O'Donnell model is made to demonstrate the effect of each parameter on the magnitude of daily runoff for small to medium sized watershed. In the structure of O'Donnell model, the sub-tank is installed in O'Donnell's model in rainfall-runoff process to give lag effect. This model uses three parameter calibration methods, trial & error method, Powell method and Rosenbrock method, in estimating parameters in order to estimate parameters of the model. And as a consequence of calibration, Rosenbrock method was most suitable among three methods. The O'Donnell type model is dealt with time variant system in which rainfall- runoff process of basin is indicated as API's function. Index of API's function is used to calibrate the infiltration coefficient(βi) and runoff coefficient (α2i) of the model. The calculated values of applied hydrologic system by O'Donnell type model are closer to observed values compared with SSARR model values.

忠州川 水系의 水面形 算定에 關한 硏究

金知學,許彰桓,張仁洙 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.2

This study aims at the provision of optimal methodology which needs for a stream improvement plan in urban watershed. The study basin is the Chungju river basin, which have the 3 tributary basins. The rational formula applied to estimate peak runoff rates in this study is the most widely used method for designing drainage facilities for small urban and rural watersheds. The HEC-2 model is applied to caculate water surface profiles for steady, gradually varied flow in Chungju river system. The computational procedure is based on solution of the one-dimensional energy equation using the standard step method. The model is applied to floodplain management to evaluate floodway encroachments and to delineate flood hazard zones. The model also is used to evaluate effects on water surface profiles of channel improvement and levees as well as the presence of bridges or other structures in the floodplain.

산지소유역에서의 분포형 단위도의 적용

金知學,許彰桓 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.2

The aim of this study is to develop the of distributed unit hydrograph in the small mountainous watershed. The distributed unit hydrograph is a unit hydrograph derived from a spatially distributed excess rainfall. It is computed from the time-area diagram of a watershed. The excess rainfall is computed by means of the Soil Conservation Service runoff curve methed. Derivation and application of the distributed unit hydrogarph is illustrated by an example using data from Yogak valley watershed in the Chungju city.

都市 流域의 尖頭洪水量 算定

金知學,許彰桓 충주대 산업과학기술연구소 1996 産業科學論文集 Vol.4 No.-

Numerous methods are available for estimating the peak flow required for design apllications in urban watersheds. Some incorporate the rainfall - runoff process, whereas others are completely empiric or correlative in that they predict peak flow by correlating the flow with simple drainage basin characterstic such as area or slpoe. In this study, the rational formula is identified as the most effective method of peak flow estimation for designing drainage facitities in urban watersheds.

FCL(5-FU, Carboplatin, Leucovorin) 항암 화학요법에서 Gm-CSF의 효과

최지영,김현수,김종숙,박상준,윤환중,조덕연,남상륜,김삼용 忠南大學校 癌共同硏究所 1998 癌共同硏究所 硏究誌 Vol.2 No.1

Background: One of the major side effects of cancer chemotherapy is myelosuppression. Neutropenia and/or thrombocytopenia are dose-limiting factors in chemotherapy. Colony-stimulating factor induces proliferation and functional maturation of hematopoietic progenitor cells. GM-CSF is primarily active on progenitor cells of granulocytic and monocytic lineage. Methods: Fifteen patients with histologically proven malignancy diagnosed at Chungnam National University Hospital from January 1993 to August 1995 were included in this study. We could evaluate the clinical efficacy of GM-CSF in 13 patients undergoing FCL(5-FU, Carboplatin and Leucovorin) chemotherapy; the first cycles involved no GM-CSF while the second cycles involved GM-CSF on day 6 through 15 of chemotherapy. Results: 1) The subjects were fifteen patients in all, there were five patients with head and neck cancer, which was the most common types of maligancy. There were four patients with colon cancer, two patients with stomach cancer, and one patient with breast cancer, gallbladder cancer, cervix cancer and cholangiocarcinoma respectively, two patients, who did not complete two cycles of chemotherapy were excluded. 2) Age distribution was from 38 years to 78 years with a median age of 57. 3) In FCL chemotherapy cycles with GM-CSF, the duration of neutropenia(<500/μL) was 0.5±0.3 day, while FCL chemotherapy cycles without GM-CSF, it was 2.9±0.7 day(P=0.008). 3) There was no significant difference in platelet count between the two chemotherapy cycles(P=0.133). 4) Febrile duration without GM-CSF was 4.9±2.1 day, but with GM-CSF the duration was 1.3±0.7 day, which was significantly different(P=0.003). The duration of antibiotics use with GM-CSF was 1.7±1.2 day and without GM-CSF was 6.8±3.2 day, also significantly different(P=0.002). But hospital stay between the two cycles were not significantly different(P=0.064). Conclusion: GM-CSF was effective in preventing or restoring bone marrow depression after FCL chemotherapy.

급성골수백혈병에 대한 관해유도화학요법 후의 Granulocyte Colony-stimulating Factor의 효과

윤환중,최지영,전의건,길준영,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.2

Granulocyte colony-stimulating factor(G-CSF) have been shown to hasten the recovery of neutropenia following anti-cancer chemotherapy. There are controversial opinions on the use of G-CSF in acute myelogenous leukemia(AML) because clonogenic studies have shown that G-CSF stimulates leukemic colonies as well as granulocyte colonies. In this study, we evaluated the effectiveness and safety of recombinant human G-CSF after induction chemotherapy with DAV regimen(Ara-C 100mg/㎡ day 1-8, Doxorubicin 45mg/㎡ day 3-5, VP-16 100mg/㎡ day 6-8) in 9 patients with AML. G-CSF therapy(200 ㎍/㎡/day) was begun 2 days after the end of chemotherapy and continued for 10 days. 17 AML patients who recieved the same chemotherapy before the onset of this study were used as historical control. G-CSF shortened the duration of granulocytopenia (less than 500/㎣) significantly (13 vs 23 days, p<0.001), but it had no effect on platelet recovery. Although the incidence of febrile episodes was almost the same, the duration of febrile episodes was shorter in the group treated with G-CSF( 5 vs 12 days, p=0.03). There was no evidence that G-CSF accelerated the regrowth of leukemic cells and the complete remission rates between the 2 groups were not different. These results show that G-CSF accelerates the recovery of granulocytopenia and shortens the febrile days after chemotherpy in patients with AML, without affecting the regrowth of leukemic cells.

부모-자녀 관계 문제를 동반하는 아동에서 운동성 가족화 검사의 반응에 관한 연구

신지용,한창환 한국임상예술학회 1999 임상예술 Vol.10 No.1

리튬이 도핑된 막을 이용한 실리콘-실리콘 접합

정지원,주병권,최우범,정성재,이남양,최두진,오명환 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1

Silicon-to-silicon anodic bonding was accomplished using lithium doped interlayer. Lithium doped interlayers were deposited on silicon substrates by electron beam evaporation, which has a fast deposition rate compared with sputtering method. Silicon-to-silicon bonding occurs in the range of temperatures from 250℃ to 300℃ with the applied voltages from 70V_(DC) to 100V_(DC). The bonding strength obtained from tensile test was about 5MPa under the condition of 80V_(DC) in 300℃. The surface morphology of lithium doped interlayer was studied with the atomic force microscopy (AFM). Finally, secondary ion mass spectroscopy (SIMS) analysis was carried out in order to investigate the role of the lithium ions in bonding mechanism.