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주교진,박신애,노동윤 서울여자대학교 자연과학연구소 2012 자연과학연구논문집 Vol.24 No.-
Using optically-active 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl (BINAP) as a P-donor, heteroleptic Pt(Ⅱ) compounds (R)-/(S)-(BINAP)Pt(TFBT)2 (H(TFBT) = 2,3,5,6-tetrafluorobenzenethiol) are prepared from (R)-/(S)-(BINAP) and (COD)PtCl2 via (R)-/(S)-(BINAP)PtCl2. These Pt(Ⅱ) compounds are characterized by FT-IR and 1H NMR spectroscopic analyses. It is noted that the arylmonothiolate ligand (TFBT) is labile in solution due to the lack of chelate effect.
주교진,전소희,노동윤 서울여자대학교 자연과학연구소 2013 자연과학연구논문집 Vol.25 No.-
The morphology change of silver nano-structures has been investigated by changing reagent concentrations, the speed of a magnetic bar, reaction temperature, and reaction time in the polyol process which were carried out in ethylene glycol solutions containing AgNO3 as a metal source and PVP (polyvinylpyrolidone) as a capping agent. Under optimized reactions, silver nanowires or nanocubes were obtained as a major product, and their morphology and composition were identified by FE-SEM and EDX analyses, respectively.
조규상,류정인 忠南大學校 産業技術硏究所 1990 산업기술연구논문집 Vol.5 No.1
It is an experimental study to evaluate the characteristics of transient response and performance of carburettered SI engine quantititively, under rapid transient driving conditions. Performance parameters such as cylinder pressure, engine speed, torque, manifold pressure and signal of stepping motor are measured by means of data acquistion system using PC/AT and A/D converter. Performance parameters are evaluated as the function of running time. The results obtained are as follows: 1. Under the rapid transient driving conditions, the value of performance parameters is delayed and increased with transient time. 2. Stumble, hesitation, and stretchiness are increased with running time in the case of without accelerater pump. 3. A quantititive evaluation is attempted on troque fluctuations and stumbles under transient conditions by introducing the stumble rate S and achievement A.
정교철,김진성 안동대학교 환경연구소 2001 환경연구 Vol.1 No.-
The area under investigation for the past ten years is in the vicinity of the Imha dam. The area is excavated for construction of new road in 1989. Differential heave in one part of the area is occurred and differential subsidence and cracking in another part are took place because of the road construction. The rocks involved are sandstone, shale and mudstone. Geotechnical and surveying techniques have been used to analyze slope instability in the past but without solving the problem of the mechanism of the these failure processes. Geophysical methods (electric resistively method and seismic prospecting method) were applied in order to identify underground geology and geological structures. The interpretation of these slope failure studies is not a straightforward analysis, but the general conclusion is that the complexity of a slope failure requires a complex investigative approach by using a combination of different geophysical methods and geotechnical methods.
정교철 안동대학교 기초과학연구소 1997 基礎科學 硏究論文集 Vol.8 No.1
Most rock masses contain a joint system that consist of a number of joint sets. A joint may be defined formally as a fracture that traverses a rock mass and is not accompanied by any discernible displacement of one face of the fracture relative to the other. In addition to, individual joints have variable but finite length. This study describes how the three-dimensional estimation of joint distribution is calculated from surface observations in field for engineering purposes. Three-dimensional joint count is a useful measure of the degree of jointing given as number of joints in a unit volume of rock masses and is easily calculated from standard joint descriptions. The three-dimensional estimation on joint distribution in outcrop can also be used to calculate the interblock size in jointed rock masses.
위암의 병기결정에 있어서 이중시기 나선식 CT의 유용성
최교창 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.1
Purpose: To evaluate the usefulness of two-phase spiral CT in the staging of gastric carcinoma. Materials and Methods: The author preformed two-phase spiral CT in 49 patients with gastric carcinomas surgically and pathologically proven after endoscopic biopsy. CT scans were obtained after ingestion of 800-1000mL of water. In all 49 patients, two-phase spiral CT findings of gastric carcinoma were retrospectively evaluated and correlated with surgical and pathological findings. Results: The author correctly detected 15(83.3%) of 18 early gastric carcinomas and 31(100%) of 31 advanced gastric carcinomas by two-phase spiral CT. The overall detection rate of gastric carcinomas was 93.9%(46 of 49 cases). The detection rate of early gastric carcinoma was 100%(5 of 5 cases) among elevated lesions and 76.9%(10 of 13 cases) among flat or depressed lesions. With regard to the depth of tumor invasion, there was good correlation between CT findings and pathologic findings in 28 of 49 cases(57.1%). Overstaging occurred in 24.5%(12 of 49 cases) and understaging in 18.4%(9 of 49 cases). In lymph node staging, good correlation between CT findings and pathologic findings was noted in 33 of 49 cases(67.3%). Understaging occurred in18.4%(9 of 49 cases) and overstaging in 14.3%(7 of 49 cases). All of liver metastases(3 cases) and peritoneal carcinomatosis(1 case) were correctly diagnosed by two-phase spiral CT. Conclusion: In the staging of gastric carcinoma, two-phase spiral CT is useful in the deterction of early gastric carcinoma and distant metastasis. However, for determining the depth of tumor invasion and for the evaluation of metastasis to lymph node its usefulness is limited. Further research using various analytic approaches will therefore be necessary.