자생 차(Camellia sinensis L.)의 육묘 방법에 관한 연구

이용호,이종성,강남대,송근우,강동주,고영옥,정대수 동아대학교 2001 大學院論文集 Vol.26 No.-

These experiments were conducted to studies on methods raising seedling in Native Tea Trees(Camellia sinensis L.). this experiment was conducted for 2years from 1999 to 2000 in Kyeongnam Provincial Rural Development Administration(R.D.A) The results were summarized as follows: 1. Germination percentage, mature seedling percentage, tiller, leaf number, leaf length and dry weight become higher Cup Pot Φ16cm treatment plot, plant height and leaf area was high some Net Pot Φ15cm treatment plot. 2. The growth of underground and aboveground show a good result all Cup Pot Φ16cm treatment plot. 3. The T/R rate of Cup Pot Φ16cm treatment plot were found 100% and Cup Pot Φ15cm treatment plot were found 114%. 4. The economic gains become higher Cup Pot Φ16cm.

Paraquat lung에서 TNF alpha 분포에 관한 연구

강상균,양승하,김대중,김의한,정용민 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.1

To investigate the process of the Paraquat induced lung damage, the white rats were administered 20 mg/Kg of Paraquat intraperitoneally. Three, seven, ten, 24 hours, three, five, seven, ten and fifteen days after this injection, the rats were sacrificed. The removed lung were evaluated by tumor necrosis factor and histologic study, so following results were obtained. 1. The significant inflammatory changes appeared after 3 days and most severity was seen in 7 days. The fibrosis appeared after 7 days and the degree was mild through observation period which indicate that the developement of fibrosis need more time. 2. TNF-∝ positivity precedes morphologic changes of the lung induced by Paraquat administratin, then positiviey of TNF-∝ decreases if the tissue destrucion is severe. 3. Early histologic change such as edema and ARDS like finding may be due to vascular leakage, caused by retraction of endothelium influenced by TNF-∝.

Paraquat lung에서 Fibronectin 분포에 관한 연구

강상균,양승하,김대중,김의한,김성용 순천향의학연구소 1996 Journal of Soonchunhyang Medical Science Vol.2 No.1

To investigate the process of the Paraquat induced pulmonary fibrosis, 10 mg/Kg and 20mg/kg of paraquat was administered intraperitoneally each of 10 rats respectively. Three, five, seven, ten and fifteen days after this injection, the rats were sacrificed. Immunohistochemical studies for fibronectin and histologic studies were carried out. Results were as follows. 1. Toxic effect of the paraquat seems to be depend on the dose of administered paraquat since the groups of the rate treated with 10 mg/kg revaled no significant tissue damage after 7 days. 2. The pulmonary changes seen in 20 mg/Kg treated group could be classified into two stages: the early changes such as hemorrhage, edema and hyaline membrane formation which are similar to the findings observed in adult respiratory distress syndrome and the late change characterized by fibrosis which observed in mild degree even after 2 weeks, so the fibrosis seen to need more time for full blown. 3. The positivity of fibronectin were observed in macrophage and exudate in the early stage of tissue destruction that the fibronectin productin is preceded fibrosis and plays an important role for the collection of inflammatory cells such as macrophaques and fiboblasts. The more tissue desturction is severe, the more strong positivity of fibronectin was observed in the early stage of tissue destruciton.

생체적합성과 생분해성을 갖는 Polypeptide Copolymers의 합성과 물성에 관한 연구(Ⅲ): Polypeptide Hydrogels의 약물조절방출

강인규,권대룡,성용길 동국대학교 자연과학연구소 1991 자연과학연구 논문집 Vol.11 No.-

Poly(γ-benzyl L-glutamate) (PBLG)의 측쇄에 polyethylene glycol(PEG) 또는 ethanolamie(EA)을 반응시켜 적심성이 서로 다른 몇가지 폴리펩티드 공중합체를 합성하였고, 이들 공중함체의 약물방출특성을 살펴보았다. 합성된 폴리펩티드공중합체의 수분흡수율은 공중합체 중의 PEG 또는 EA 함량이 높아짐에 따라 증가하였다. PEG-PBLG-EA 공중합체로부터의 5-fluorouracil의 방출속도는 PEG-PBLG 공중합체로부터의 방출속도보다 크게 나타났으며, 이러한 결과는 팽윤성의 폴리펩티드를 합성하고자 할 때 사용되는 치환제로서는 PEG보다도 EA가 더욱 효과적이라는 것이 나타났다. 한편, PEG를 가교시킨 PBLG 공중합체막상에서는 5-fluorouracil의 방출에 기인하여 작은 pores를 명료하게 나타나고 있음을 알 수 있었다. Several copolypeptides having different swellabilities are are synthesized by introducing polyethylene glycol(PEG) or ethanolamine(EA) to the side chains of poly(γ-benzyl L-glutamate) (PBLG) and their drug release characteristics are examined. The degree of swelling of copolypeptide is increased by increasing PEG or EA content in the polymer. The release rate of 5-fluorouracil from the PEG-PBLG-EA copolymers was higher than that of the PEG-PBLG copolymers. This results indicated that EA is more effective than PEG for the preparation of the swellable polypeptides. It was observed, from the morphological study by scanning electron microscope, the pores are generated on the PEG-crosslinked PBLG, but not on the PEG-grafted-PBLG.

한국인의 각막에 관한 연구

강현식,김대년,김상연,강인산,박은규,서용원 대구보건대학 1999 대구보건대학 論文集 Vol.19 No.-

As the results of measurement of the radius of corneal curvature by keratometry for the right eye of 100 subjects, the steep meridian radius is 7.21㎜ to 8.27㎜ and flat meridian is 7.45㎜ to 8.65㎜, for the left eye the steep meridian radius is 7.30㎜ to 8.35㎜, and flat meridian is 7.45㎜ to 8.72㎜. The mean value of radius of corneal curvature is 7.8㎜ for night eye, 7.8㎜ for left eye. The results of measurement of P-value by topography, it is ranged from 0.45 to 0.91 for the night eye, 0.55 to 0.90 for the left eye, mean value is 0.756 for right eye, 0.735 for left eye respectively. That means the corneal shape is ellipses. The corneal thickness is measured 0.69㎜ 10°degree to the nasal, 0.76㎜ 20°degree to the nasal, 0.66㎜ 10°degree to the temporal, 0.72㎜ 20° degree to the temporal from the visual axis and 0.60㎜ at the central position. The horizontal size of corneal is 11.34㎜ for the night eye, 11.373㎜ for left eye. Those data can be used for contact lens design and fitting.

복막유착의 원인 규명과 예방을 위한 실험적 연구

강대영,송규상,노승무,조준식,이태용 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1

Postoperative peritoneal adhesion is the most common cause of intestinal obstruction, and intestinal obstruction is one of the most difficult problems in abdominal surgery. In this experimental study for developing peritoneal adhesion model and its prevention, we divided rats into 5 groups; the talc powder treated group, the cotton-fluff treated group, the talc+fluff treated group, the ischemia group and the control group. There were 16 rats in each group. We made incisions on the midabdomen of the rats and administered talc powder, cotton fluff and talc powder+fluff into the peritoneal cavity respectively. In the ischemia group, we clamped the root of superior mesenteric artery for two minutes to induce ischemia on the small bowel of the rat. We counted the number of the peritoneal adhesive sites in peritoneal cavity on the 7th, 14th , 21st and 42nd postoperative day after peritoneal adhesion induced operation, and observed the characters of the adhesion state. The average number of the peritoneal adhesions were 1.25 per one rat in the talc powder group, 1.44 in the fluff group, 1.31 in the talc+fluff group and 1.31 in the ischemia group compared with 0.94 per one rat in the control group performed sham operation. 91.6% of the all adhesions were observed on the peritoneum of the previous incision sites and only 8.4% of the adhesions were adhered to the peritoneal surface of non-incision sites. The data of this study suggest that peritoneal injury and inflammatory reaction is the major cause of peritoneal adhesion. Also this study indicates that foreign bodies can develop peritoneal adhesion, but the effect is much lower than that of peritoneal injury with inflammatoty reaction.

말기신부전 환자에서 혈액투석 전후의 QT간격분산 비교

강대웅,정지용,윤나라,안치용,김종오,신병철,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2

Background: Some cases of QT interval, corrected QT interval (QTc), QT dispersion (QTd) and corrected QT dispersion (QTcd) have been reported in ESRD, but these results are variable and the influence of a hemodialysis is still controversial, In this study, we investigated the effect of hemodialysis on QT and QTc interval and QT and QTc dispersion in patients with ESRD 15 min before and 15 minute after each hemodialysis. Methods: Sixty-seven patients with ESRD (men 33 & women 34) on three-times stable hemodialysis (>3 months) were randomly enrolled. Fifty control subjects with a similar age and normal renal function were enrolled from this hospital. Routine biochemical studies were measured pre- and post dialysis, at the time of the ECG. Plasma Na+, K+, BUN, creatinine, ionized calcium and phosphate were checked. Twelve-lead electrocardiographs were performed at 10㎜/mv and 50㎜/s using a HewIett-Packard Pagewriter 100, before and after a single hemodialysis session.The QT interval was measured from the onset of the QRS complex to the end of the T wave. If the end of the T wave was not clear in a particular lead then it was excluded from analysis. When U waves were present, the end of the T wave was taken as the nadir between the T and U waves. Each QT interval was corrected for heart rate using Bazett's formula (QTc==QT/√(RR)) (ms). The difference between maximal and minimal QT interval duration was defined as QT dispersion (QTd) in each of the 12 leads. Result: This study demonstrates that QT, QTd, QTcd is higher in hemodialysis patients compared with control subjects, and QT and QTd rise postdialysis to levels comparable to those seen acutely following myocardial infarction, when patients are at greatly increased risk of potentially fatal ventricular arrhythmias, Conclusions: QT interval and QT dispersion, markers of risk for arrhythmias and sudden death, are elevated in hemodialysis patients, and rise postdialysis. QT interval and QT dispersion is an easily obtainable, noninvasive, simple, inexpensive, and widely available method of risk stratification in uremic patients receiving chronic dialysis. Additional studies are needed to clarity whether increased postdialysis QT dispersion results in an increased occurrence of arrhythmias.

정밀전단시의 유한요소 해석을 위한 파단기준 연구

강대철,전병희,이원평,성부용 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.5

The Tailor Welded Blanks(TWB) are using various materials (different thickness, strength and different materials) can be welded together prior to the forming process. Therefore, TWB applications have become little by little important in automobile industries, because it has more light weight and process reduction. A burnish area is very important for TWB using laser welding. In this paper, evaluated failure criterion, effect of clearance and distance of between pad and punch by computer simulation. We used element separation method for fracture. And applied a plastic strain to failure criterion. According to the analysis results, we obtain failure criterion, when plastic strain is 2.0. The burnish area and clearance were inverse proportional.

삼각형 모양에 의한 회절현상에 관한 연구

강성수,성덕용,육도진,홍성대,이원진 대구산업정보대학 2003 논문집 Vol.17 No.-

A review of diffraction phenomena for double slit and regularly triangular aperture has been done. First, as a width b and a space d of double slit vary, a diffraction pattern has been calculated by theory. Second, an intensity of diffraction light and separation between fringes for slit has been measured. And, we can expect that the calculated diffraction pattern for a regularly triangular aperture has three symmetric axes.

Zn_39.5Cd_60.5Te 단결정을 이용한 Solar Cell 제작과 그 특성 연구 (Ⅱ) : n형 Zn_39.5Cd_60.5Te 단결정의 열처리에 의한 비저항조절 Resistivity control of the n-type Zn_39.5Cd_60.5Te single crystals by thermal diffusion and heat treatment method

강현식,최용대,김내호 全北大學校 敎育大學院 1985 敎育論叢 Vol.5 No.-

For the control of low resistivity of n-type Zn_39.5 Cd_60.5 Te single crystals, we employed several processes of doping and thermal diffusion using the vapor of Cl_2, I_2, CdI_2, Al and In. As seem to be most proper method we thought, the following techniques were used; 1. In the crystal growing by Bridgman method, I_2 donor impurity (0.025-0.005 atomic wt%) is dopped. 2. The grown crystals are transfered and placed in In-vapor(6 Torr) for 1 hr to diffuse thermally again I_2 into the crystals. 3. And then make to diffuse Cd into the vacancies of Cd among the grown crystals in Cd-vapor (0.25 Torr) for over 5 hrs. As the result, we obtained the n-type Zn_39.5 Cd_60.5 Te crystals having the low resistivity of about 0.1Ω-cm.