Polypropylene사를 이용한 단속단층 식도문합술

성시찬,편승환 동아대학교의과대학 1997 동아의대학술지 Vol.9 No.2

액체막법에 의한 중금속이온의 분리 및 회수

曺文換,丁學鎭,이상인,金振浩,金始中 江原大學校 附設 環境硏究所 1994 環境硏究 Vol.11 No.-

거대고리 리간드는 금속이온과 선택적으로 결합하는데, 이를 이용하여 에멀젼 액체막을 통한 금속이온의 이동에 관하여 연구를 수행하였다. 금속이온은 유기층에 있는 운반체에 의하여 source phase에서 receiving phase으로 이동한다. 운반체로는 거대고리 리간드인 DBN_(3)O_(3)를 사용하였다. 여기에서 에멀젼 액체막을 통한 금속이온의 이동에 관한 요인과 어떤 금속이온의 선택적 분리에 관하여 검토하였다. 금속이온과 거대고리 리간드 그리고 금속이온과 receiving phase내에 있는 음이온에 대한 안정도 상수를 금속이온의 선택적 이동에 대한 척도로 조사하였다. 납이온이 혼합 용액에서 다른 금속이온보다 높은 이동속도를 나타내었다. Receiving phase내의 음이온이 금속이온의 이동에 중요한 역할을 한다. Receiving phase내에 있는 NO_(3)^(-)을 S_(2)O_(3)^(2-) 대치하면 이동량이 증가함을 보였는데 이는 Pb^(2-)-S_(2)O_(3)^(2-) 상호작용이 Pb^(2+)-NO_(3)^(-) 상호작용보다 크기 때문이다. Macrocyclic ligand has been know to selectively bind with metal ions so that ability applied for the transport of metal ions across the emulsion liquid membrane in this study. The metal ions are transproted from the source phase to the receiving phase by the carrier of the organic phase. Several factors involved in the transport of metal ions acrose the emulsion membrane we reported here and these factors proveided the informations for the selective seperation of some metal ion. Stability constants for cation-macrocyclic ligand and metal ion-anion receiving phase interaction are examined as parameters for the prediction of metal ion transport selectivities Pb^(2+) was transported higher rates than the other metal ions in the mixture solution. The interaction of metal ion to anion in receiving phase is important. S_(2)O_(3)^(2-) in replacement of NO_(3)^(-) in the receiving phase enhances the transport of pb^(2-) since Pb^(2-)-S_(2)O_(3)^(2-) interaction is greater than Pb^(2+)-NO_(3)^(+) interaction.

개수로의 종방향 하상고에 대한 통계학적 연구

안시권,이원환,박상덕 연세대학교 산업기술연구소 1987 논문집 Vol.19 No.2

This study is a statistical analysis for properties of bed elevation with distance along the open channel by stochastic models and spectral model. In this study, AR(2) model more adequate than ARMA(1,1) model in the equilibrium bed elevation of open channel. In the case of dunes, the spectrum is proportional to the wave number to the power-3 but in the case of ripples, this is not confirmed. Spectral model is more dependent on Re than Fr in the experimental data of shallow open channel.

노안수술후 각막형태검사 변화

박근성,고길환,김용선,이재림,민병무,최시환 충남대학교 의학연구소 2001 충남의대잡지 Vol.28 No.2

We prospectively analyzed the corneal topography of 26 eyes in 26 patients who had undergone scleral expansion for correcting presbyopia. We examined 26 eyes of 26 patients which were devided into 2 groups (mean age: 51 years, range 40-60 years) according to type of scleral expansion band, with computerized corneal topographic analysis system. Preoperatively and 5 times postoperatively (1day, 1week, 2weeks, 1month, 2months), quantitative descriptors of corneal topograpgy such as Sim K (simulated keratometry value), SRI(surface regularity index), and SAI(surface asymmetry index) were measured at each visit. The mean follow-up period was 43 days. Sim K of the operative eyes ranged from 0 to 2.5 (mean, 0.93) before operation, and mean 2.24 at postoperative 1 day in group Ⅰ. In group Ⅱ, Sim K was mean 2.20 at postoperative 1 day and decreased thereafter. SRI was from 0.54 to 1.39 and SAI was from 0.09 to 0.45 before operation. After operation, mean SAI was maximum at postoperative 2 week and mean SRI was maximum at postoperative 1 day and decreased thereafter. After two months, it became minimum. This study demonstrates that quantitative topographic change after scleral expansion for correcting presbyopia were great during first 1 week after surgery but this change diminished thereafter. Further long studies are in progress to evaluate the long term effects of this procedure.

연쇄상구균을 실험감염시킨 넙치치어의 병리조직학적 관찰

조성환,류시윤,김현수,박배근,김덕환,손화영,윤원기,신창호 충남대학교 수의과대학 동물의과학연구소 1999 動物醫科學硏究誌 Vol.7 No.-

Pathological observations were examined after abdominal inoculation in 7∼8㎝ sized flounder (Paralichthys olivaceus) with 1X10^7 cfu/㎖ of Streptococcus faecalis. The infected flounder were clinically observed and weighed a fish body at 0, 5, 10, 15, 20, 25, 30 days post inoculation. In infected group, mortality were 70% and feed efficiency were 7.2%. In non-infected group, mortality were 10% and feed efficiency were 18.2%. Macroscopically, the significant lesions were characterized by protrusions and opacity of the eyes and ulcer of the caudal pecuncle. Histopathologically, the lesions were observed a degeneration. necrosis and inflammatory cells in muscle of the caudal peduncle and a degeneration and necrosis of the rod cells and detached retina from the black pigmented layer

흰쥐에서의 카르복시메칠셀룰로오스나트륨과 겔란검 혼합겔의 유착방지 효과

권윤환,이시범,이정권,박용덕,박정숙,황성주 한국약제학회 2004 Journal of Pharmaceutical Investigation Vol.34 No.6

The aim of the present study was to investigate the efficacy of a mixed gel formulation composed of sodium carboxymethyl cellulose and gellan gum (Na-CMC gel) for the prevention of adhesions after laminectomv. The anti-adhesive effect of the Na-CMC gel was tested in a controlled randomized study using an animal model of lumbar laminectomv. The animals (60 female Sprague-Dawlev rats) were randomly allocated into two treatment groups to receive the Na-CMC gel on the injured area or no gel (control). The incidence of adhesions and their grade were blindly evaluated at 4. 8 and 12 weeks after surgery. The amount of scar tissue and tenacity were grossly reduced by the Na-CMC gel at postoperative 4. 8. and 12 weeks. The mean adhesion scores were 0.75. 125. and 1.38 at 4. 8. and 12 weeks in the gel-treated group. respectively. No significant inflammatory reaction was observed and the healing of wound was not affected by the Na-CMC gel. The Na-CMC gel reduced the amount of scar formation and tenacity in rat laminectomv model without affecting the healing of operation wound and other complications. Therefore. the Na-CMC gel may be the potential to prevent postsurgical adhesions in clinical state.

새마을 簡易上水道事業의 評價分析과 合理的方案에 관한 硏究

梁相鉉,尹載殖,金煥起 全北大學校 1982 論文集 Vol.24 No.-

Anthor examined the small water supply works of 108 which had been excuted in Jenbug region before the year of 1977, and this is the report on the evaluation of the works and the proposed rational methods for the works. It was found that the excuted woks had many faults. Though water works were required the highly specialized abilities in engineering and administration, water works were excuted in too small units of each villagage, and the many fauts of the works were resulted. Accordingly, the method of excuting the water supply works with the larger units bound several villages is proposed as the rationl.

BGO 단결정의 Scintillation 특성

김도성,이상환,도시홍 大邱大學校附設 基礎科學硏究所 1994 基礎科學硏究 Vol.11 No.-

In this study, the crystalline and scintillation characteristics of the BGO(Bi4Ge5O12) single crystal are investigated. The BGO single crystal is grown by Czochralski method at the pulling rate of 3---4mnVh, rotation rate of 20rpm and melting temperature of 1044`. It is shown that the crystal has been grown on the (I11) surface by XRD and etch-pit method. The gamma ray energy spectrum is measured by the BGO single ctystal attached to photomultiflier tube. The pulse height from the scintillation detector system using the BGO single crystal is linear to gamma ray energy and the energy resolution is typically 21.2% for Cs-137. The grown BGO single crystal may be useful in gamma ray detection and spectroscopy.

Paraquat Poisoning에서의 hemoperfusion치료 경험

김시환,최재성,윤경우,김영조,최수봉,김종설 대한신장학회 1986 대한신장학회잡지 Vol.5 No.1

Mitomycin-C 적용시간에 따른 누낭비강연결술의 수술결과

박근성,임진호,민병무,최시환,김창식,김용백 충남대학교 의학연구소 2001 충남의대잡지 Vol.28 No.2

To determine the usefulness of application of Mitomycin-C (MMC) and effectiveness of different concentration of MMC in external DCR. A total of 100 eyes of 87 patients diagnosed with primary acquired nasolacrimal duct obstruction were assigned randomly to either a MMC group or control group. The surgical procedures in both groups were same. In MMC group, a piece of neurosurgical cottonoid soaked with 0.4 mg/ml MMC was applied to the osteotomy site and then was removed after 5 and 10 minutes differently. Nasoendoscopic examination was performed at 1 month, 3 months, and 6 months after surgery for all patients. The causes of epiphora as trauma (20 cases), failed DCR (1 case), sinus surgery (2 cases), unknown (77 cases). The overall anatomical success rate of the procedure was 88% and functional success rate was 79%. Obstruction site was related to anatomical surgical results. Anatomical surgical outcome at lower lacrimal sac level group of patients showed a statistically significant success rate, but functional surgical outcome showed no significant difference between the two groups. The anatomical success rate was 87.7% and the functional success rate was 84.2% in MMC group. The anatomical success rate was 88.3% and the functional success rate was 74.4% in control group. Application of MMC and it's application time were not related to surgical results.