투시장치의 화질관리 실태 조사

이성길,김영근,김창복 광주보건대학 2004 論文集 Vol.29 No.-

It is important to control resolution for maintenance of good image quality in fluoroscopic unit. This study is to analyze current situation on control of image quality in fluoroscopic unit. Between the sixth and the twenty eighth March 2003, 77 fluoroscopic units in 40 hospitals in Seoul and Kyung-gi area were tested with fluoroscopic phantom(CDRH phantom, Nuclear associates, USA) and image quality test tool including hight contrast resolution patterns and low contrast objects. We exposed radiation in condition of colon study, and then counted the number of patterns on monitor, printed spot film, and printed abdominal film. In the test on monitor, suitable unit within standard number in hight contrast and low contrast test were 68(88%), 49(64%), respectively, and in the test on printed spot film 73(95%), 67(87%), respectively. The cases within standard number in hight contrast and low contrast test on all the two monitor and printed spot film were 44(57%), 65(84%), respectively. Thradiation was exposed from 100 to 120Kvp in fluoroscopy, and spot radiography 80 to 110Kvp mainly. In conclusion, it is necessary that image quality control is done continuously by standard of image quality control suitable for current situation.

論山 月城里 斷層地域의 電氣比抵抗 探査

李元國,李聖馥 공주대학교 사범대학 과학교육연구소 1990 과학교육연구 Vol.22 No.1

The detailed surface geological survey and electrical resistivity exploration were carried out in the study area. The resistivity data were measured over 3 lines with the Wenner and Schlumberger configuration. In the resistivity profiling, low resistivity anomaly zones were detected on every traverse, and they are interpreted to be caused by abundunt water content in the fracture zone or the fault zone. The fault trend recognized in this study coincides with the direction of the inferred fault line from the geological surface mapping, but the detailed location of the fault should be corrected. The strike and the dip of the fault is NNE and vertical. The width of the fault zone is about 10-20m in traverse A-A` and about 30-40m in traverse C-C`. Subsurface section models in the study area are interpreted as follows: 1) At the traverse A-A`, the first unit is mainly composed of clay(less than 100Ω-m) from surface to the depth of 16m and the second is bed rock(more than 2000Ω-m). 2) At the traverse B-B`, the first unit is mainly composed of clay and the second is composed of sandy gravel(400-800Ω-m) or sandy-soil (1000-2000Ω-m). 3) At the traverse C-C`, the first unit is alluvium deposit (200-800Ω-m), the second is mainly composed of clay (100-200Ω-m), and the third is bed rock (more than 2000Ω-m).

지방정부의 세계화전략에 대한 연구

이성복 건국대학교 사회과학연구소 2002 社會科學論叢 Vol.26 No.-

도시행정관리기법의 이용과 효과에 관한 비교·연구 : 서울특별시의 25개 자치구를 대상으로 Focused on 25 local autonomic districts of Seoul Metropolitan Government

이성복 건국대학교 사회과학연구소 2001 社會科學論叢 Vol.25 No.-

PC 상에서 On-line 한글 인식에 관한 연구

이재도,양승복,정수웅 대구보건대학 1994 대구보건대학 論文集 Vol.14 No.-

In this paper, Using a Fuzzy theory an On-Line phoneme recognition procedure of Korean characters is studied. The recognition method is performed by reading the pixel coordinates, finding the feature points, recognizing the stroke, recognizing the phoneme in order. In the course of recognizing the stroke, first the feature points of an inputed stroke is characterized by starting point, end point, and bending point. and then, based on 0, 5, 6, 7, 8, 9, and 10 stroke code among the recognized stroke the distance or direction between base stroke and the next input stroke is used for recognizing the phoneme

주류소비지출에 관한 연구

이성림,복미정 울산대학교 2002 생활과학논문집 Vol.4 No.1

본 연구는 도시가계조사자료를 이용하여 우리나라 가계의 주류소비지출 수준과 가계의 사회인구학적 특성에 따라 주류 소비지출수준에 의미있는 차이가 있는지 분석하였다. 분석결과 맥주주와 소주의 지출 수준이 가장 높게 나타났고 맥주는 주로 젊은층에서, 소주는 중년층에서 소비지출 수준이 보다 높게 나타났다. 대체로 고소득, 고학력, 전문직 가계에서는 맥주, 위스키, 기타 주류의 소비지출이, 저학력, 조작원 및 단순 노무직 종사자 가계에서 소주, 탁주, 청주에 대한 지출 수준이 보다 높은 것으로 나타났다. This study investigates the levels of the household consumption expenditures in various alcohols, and analogies whether there are significant differences in the alcoholic expenditures by households with different socio-demographic characteristics. The major findings are: first, among the five alcoholic categories, the consumption expenditure levels on beers and Soju are relatively high, while young households seem to prefer beers and Mid-aged household seem to prefer Soju; generally high income, high educational attainment, and managerial and professional occupations are associated with the high expenditure levels on beer, whisky, and other alcoholic beverage, while low educational attainment, operator & laborer occupation are associated with the high expenditure levels on Takju and Chungju.

질산용액에서 Nitroaniline 류에 의한 Al-brass의 부식억제에 관한 연구

주석복,김면섭,이성하 漢陽大學校 環境科學硏究所 1992 環境科學論文集 Vol.13 No.-

0.1M 질산용액에서 nitroaniline류에 의한 Al-brass의 부식억제에 대하여 무게감량 실험, 분극실험, SEM사진 분석 등을 행하였다. Al-brass의 부식속도는 부식계의 온도와 억제제의 농도 그리고 부식억제제의 형태 등에 의존한다. 무게갈량실험과 분극실험을 통해 알아낸 부식억제 효율은 2-nitroaniline>3-nitroaniline>4-nitroaniline의 순이었다. 분극실험의 결과로부터 억제제의 농도가 증가할수록 부식전위는 noble한 방향으로 이동하며 양극 Rafel slope는 일정한 반면 음극 Tafel slope는 증가하여 전류밀도를 감소시키는 것으로 보아 억제제인 nitroaniline는 Al-brass의 음극반응을 억제하는 것을 알 수 있었다. SEM사진 분석에서는 Al-brass의 표면상태를 확인함으로써 각 억제제가 부식반응을 상당히 억제하고 있음을 알 수 있었다. 또한, Flory-Huggins adsorption isotherm의 도입으로 구한 열역학적 특성치로부터 억제제의 흡착형태 등을 알 수 있었다. The inhibition effect of nitroanilines of corrosion of Al-brass in 0.1M nitric acid has been studied by weight loss measurement, polarization method and scanning electron microphotographs. Corrosion rate of Al-brass was depended on concentration of inhibitor and and temperature. The order of inhibitor efficiency according to the position of the substitued group was 2-nitroaniline>3-nitroaniline>4-nitroaniline. The results obtained from weight loss measurements were agreed to those obtaind from polarization studies. Thermodynamic parameters obtained form Flory-Huggins adsorption isotherm showed strong interaction between inhibitor molecules and Al-brass surface.

저주기 피로변형시 316L 스테인리스강의 비안정화 거동에 미치는 온도의 영향 : 반복응력거동 및 적정 피로수명인자 Cyclic Stress Response and a Suitable Fatigue Parameter

홍성구,이순복 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.1

In this study, cold worked (CW) 316L austenitic stainless steel was investigated by performing low-cycle fatigue test with varying temperature, strain amplitude, and strain rate. CW 316L stainless steel underwent additional hardening at room temperature and in the temperature range of 250-600℃: The hardening at room temperature came from plasticity-induced martensite transformation, and the hardening over 250-600℃ was attributed to dynamic strain aging. These hardening mechanisms competed with the softening mechanism which was induced by dynamic recovery, generally observed in cold worked materials, resulting in the cyclical non-stabilization of the material. Three fatigue parameters, such as stress amplitude, plastic strain amplitude, and plastic strain energy density, were evaluated. The results revealed that plastic strain energy density was nearly invariant through a whole life and, thus, recommended as a suitable fatigue parameter. (Received September 3, 2004)

S-2 (3-aminopropylamino)ethylphosphorothioic acid (WR-2721)가 방사선에 조사된 흰쥐의 효소 활성에 미치는 영향

고성진,이천복,김재영 THE KOREAN SOCIETY FOR BIOMEDICAL LABORATORY SCIEN 1997 Journal of biomedical laboratory sciences Vol.3 No.1

S-2 (3-aminopropylamino)ethylphosphorothioic acid (WR-2721)이 방사선에 대한 방어효과에 미치는 영향을 규명하고자 Sprague-Dawley계 웅성 흰쥐를 대조군, WR-2721 단독투여군 (200㎎/㎏), X-선 단독조사군, WR-2721투여 (200㎎/㎏)후 X-선 조사한 병용군으로 나누어 X-선 8 Gy선량을 전신조사한 후 1,3,7,10일 간에 각각 혈액을 채취하여 효소활성치와 glucose함량 변화를 측정하여 다음과 같은 결과를 얻었다. X-선 단독조사군에서는 ALP와 AST의 활성치가 대조군에 비하여 감소하였으나 WR-2721 을 병용한 군에서는 그 감소폭이 줄어들었고, ALT와 LDH의 활성치는 X-선 단독조사군에서 대조군에 비하여 증가하였고, WR-2721을 병용한 군에서는 그 증가폭이 감소되었다. 또한 glucose치의 변동은 X-선 단독조사군에서 대조군에 비하여 유의성 있게 증가하였으나 WR-2721을 병용한 군에서는 그 증가폭이 감소되었다. 이로 미루어 보아 WR-2721이 X-선으로부터 생체내 주요 장기들을 보호하는 작용이 있음을 시사하고 있다. Male rats of Albino strain were divided into four groups, control group, X-irradiated group, WR-2721 treatment group and X-irradiated group treated with WR-2721. The radioprotective effect of treatment with S-2 (3-aminopropylamino)ethylphosphorothioic acid (WR-2721) in the dose of 200㎎/㎏ by intraperitonial injection on rats 20min prior to wholebody X-irradiation (8Gy) was studied. Each group determined serum alkaline phosphatase (ALP), aspartate aminotransferase (AST), alanine aminotransferase (ALT), lactate dehydrogenase (LDH) activities and contents of serum glucose after 1, 3, 7 and 10 days. The ALP and AST activities of X-irradiated group were significantly decreased (p<0.05) compared with that of control group, but X-irradated group treated with WR-2721 less decreased those enzyme activities compared with the X-irradiated group. X-irradiated group was significantly increased (p<0.05) ALT and LDH activities compared with that of control group, but X-irradated group treated with WR-2721 less increased those enzyme activities compared with the X-irradiated group. The concentration of serum glucose of X-irradiated group was signficantly increased (p<0.05) compared with that of control group, but X-irradated group treated with WR-2721 less increased compared with that of X-irradiated group. It may be considered that WR-2721 provided radioprotective effect of organs of body from X-irradiation.

316L 스테인리스강의 고온 저주기 피로저항에 미치는 동적변형시효의 영향

홍성구,이순복 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.2

Mechanism of dynamic strain aging (DSA) and its effect on the low-cycle fatigue (LCF) behavior in type 316L stainless steel were investigated by performing LCF tests in air in a wide temperature range from 20 to 650℃ with strain rates of 3.2x10^(-5)-1x10^(-2)/s. The regime of DSA was evaluated using the anomalies associated with DSA and was in the temperature range of 250-550℃ at a strain rate of 1x10/s, in 250-600℃ at 1x10^(-4)/s, and in 250-650℃ at 1x10^(-2)/s. The activation energies for each type of serration were about 0.57-0.74 times those for lattice diffusion indicating that a mechanism other than lattice diffusion is involved. It seems to be reasonable to infer that DSA is caused by the pipe diffusion of solute atoms through the dislocation core. Dynamic strain aging reduced the crack initiation and propagation life by way of multiple crack initiation, which comes from the DSA-induced inhomogeneity of deformation, and rapid crack propagation due to the DSA-induced hardening, respectively. (Received October 29, 2004)