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이승범,장익,현도윤,이정로,김성훈,유은애,이수경,조규택,이경준,Lee, Seungbum,Jang, Ik,Hyun, Do Yoon,Lee, Jung-Ro,Kim, Seong-Hoon,Yoo, Eunae,Lee, Sookyeong,Cho, Gyu-Taek,Lee, Kyung Jun 한국작물학회 2020 한국작물학회지 Vol.65 No.4
Melon (Cucumis melo L.), one of the most important fruit crop species, is cultivated worldwide. In this study, a total of 206 melon accessions conserved at the National Agrobiodiversity Center (NAC) in RDA were characterized for nine morphological characteristics according to the NAC descriptor list. In addition, to confirm the genetic composition of each melon accession, genetic profiling was performed using 20 SSR markers. Among the 206 melon accessions, 159 (77.2%) were collected from Asia. The color of fruit flesh and skin were mostly 'white' (56.0%) and 'green' (49%), respectively. Days to female flowering (FD) and maturity (MD) of the accessions ranged from 58 to 72 and 17 to 63, respectively. The fruit length and width of the accessions ranged from 6.0 to 29.3 and 3.6 to 17.2 cm, respectively. The sugar content (SU) ranged from 2.5% to 13.2% with an average of 7.0%. In correlation analysis, SU showed positive and negative correlations with MD and FD, respectively. The accessions were classified into four clusters by cluster analysis. From the results of genetic profiling using 20 SSR markers, three accessions (K189118, K100486, and K190292) were expected to be inbred lines among 206 melon accessions. These results could expand the knowledge of the melon germplasm, providing valuable material for the development of new melon varieties to suit consumer tastes.
Diluent filler particle size effect for thermal stability of epoxy type resin
이승범,Hyung Jin Lee,홍인권 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
Epoxy resin is used as a material for electrical and electronics molding in various forms but its thermal conductivity must be controlled with various additives on account of its lower conductivity than metal or ceramics. Silicon dioxide (SiO2) and silica were selected as the reinforcement and diluent filler for epoxy resins, respectively. The optimum amount of reinforcement filler, SiO2, was 50 wt%. The thermal properties and thermal stability were observed according to silica ratio and particle size. An epoxy modified with a polyamide type hardener showed superior thermal conductivity to that modified with a cyclo-aliphatic amine type hardener. The thermal conductivity increased with increasing silica ratio and particle size. The thermal stability evaluation based on the particle size of silica was in the order of 14/18 mesh (1.00–1.16 mm) > 8/10 mesh (1.65–2.36 mm) > 28/35 mesh (0.42–0.59 mm). The optimum silica size of the diluent filler was 14/18 mesh (1.00–1.16 mm). An epoxy type resin transformer with excellent thermal properties and thermal stability could be designed when the mixing weight of epoxy resin was equal to that of the hardener.
백내장수술 후 발생한 안내염환자에서 최종시력과 연관된 여러 인자
이승범,한정원,정성근,백남호.Seung-Bum Lee. M.D.. Jung-Won Han. M.D.. Sung-Kun Chung. M.D.. Nam-Ho Baek. M.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.10
Purpose: The most serious complication related to cataract surgery is endophthalmitis. Although its incidence is decreasing, it remains the great threat to the outcome of visual acuity in patients who received cataract surgery. Methods: Retrospective analysis was performed on 18 patients who were diagnosed with endophthalmitis. The following factors were investigated: method of cataract extraction, performance of anterior vitrectomy, presence of posterior capsule rupture, results of bacterial culture, existence of systemic disease, and the duration of time from initial cataract surgery to diagnosis of endophthalmitis and then to subsequent posterior vitrectomy. In addition, the differences in final visual acuity due to variations in these factors were analyzed. Results: Patients who were diagnosed with endophthalmitis and had been commenced on systemic antibiotics within a week of the cataract operation, showed better outcomes in final visual acuity (P=0.043). Conclusion: Occurrence of endophthalmitis and subsequent usage of systemic antibiotics within a one-week time frame of cataract surgery, led to statistically significant improvement in final visual acuity compared to cases in which these events occurred one week later.
이승범,연제영,채경준,정의원,김창성,이용근,조규성,채중규,김종관,최성호,Lee, Seung-Bum,Yon, Je-Young,Chae, Gyung-Joon,Jung, Ui-Won,Kim, Chang-Sung,Lee, Yong-Geun,Cho, Kyoo-Sung,Chai, Jung-Kiu,Kim, Chong-Kwan,Choi, Seong-Ho 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.4
Purpose: Various bone graft materials are being used for periodontal tissue regeneration. Th materials are being developed continuously for ideal clinical effects. Therefore, it is necessary to identify the clinical characteristics of each bone graft material through comparing the various bone graft materials statistically and in doing so, proposing a more efficient bone graft material. In this study, the following results were attained through comparing the clinical effects among the bone graft materials, using the statistical method based on the clinical studies published at the department of periodontology of Yonsei hospital. Materials and Method: 6 selected studies of department of Periodontology at Yonsei University Hospital were based on clinical study of bone grafting in intrabony defects. It was compared the clinical parameters among the 6 clinical studies, using the statistical META analysis. Result: When comparing the probing depth reduction, there was a relatively great amount of decease when using the xenograft, Anorganic Bovine Derived Hydroxapatite Bone Matrix/Cell Binding Peptide(ABM/P-15: PepGen $P-15^{(R)}$) and the autogenous bone and absorbable membrane, d, 1-alctide/glycolide copolymer(GC: $Biomesh^{(R)}$). The allogfrafts showed a relatively low decrease in the probing depth and clinical attachment change. It also showed a slight decrease in the bone probing depth. The allografts showed various results according to different bone graft materials. When comparing the ABM/P-15 and bovine bone $powder(BBP^{(R)})$, ABM/P-15 showed a relatively high clinical attachment level and the bovine bone powder showed a relatively high clinical attachment level. The probing depth change and gingival recession change showed a lower value than the mean value between the two bone graft materials. The synthetic bone showed a relatively high decrease in clinical attachment level and periodontal probing depth change. There was a relatively larger amount of gingival recession when using Bioactive Glass(BG) but a relatively low bone regeneration effect was seen. Conclusion: Good restorative results of the periodontal tissue can be attained by applying the various bone graft materials being used today after identifying the accurate clinical effects.
초임계유체 크로마토그래피를 이용한 지방산의 확산특성 해석
이승범,성대형,김형수,홍인권 ( Seung Bum Lee,Dae Hyung Seong,Hyung Su Kim,In Kwon Hong ) 한국공업화학회 1996 공업화학 Vol.7 No.6
지방산의 분리방법중 증류나 추출 등의 전통적인 방법을 대체할 수 있는 공정으로 초임계유체 크로마토그래피 분리법을 추천할 수 있다. 그러나 지방산을 구성하는 탄소수나 불포화도는 초임계유체내에서 확산특성을 달리 하지만 이들의 정량적인 데이터가 부족하여 초임계유체 크로마토그래피법을 공정화하는데 큰 어려움이 있다. 본 연구에서는 불포화도를 달리하는 지방산들의 초임계 이산화탄소내 확산계수를 CPB법(capillary peak-broadening method)을 기초로 온도(308.15∼328.15K)와 압력(13∼17MPa)을 변수로 하여 실험적으로 측정하였다. 이성분계 확산계수는 일정한 온도에서 압력이 증가함에 따라 감소하며 일정한 압력에서 온도가 증가함에 따라 증가하였다. 일정한 밀도에서 온도에 따른 확산계수의 영향은 크지 않으며, 밀도와 점도가 증가함에 따라 확산계수는 감소하였다. 또한 Wilke-Chang식과 Funazukuri의 실험식, Matthews-Akgerman식을 초임계 이산화탄소에서의 이성분계 확산계수에 대한 상관식으로의 이용가능성을 확인한 결과 다른 상관관계식에 비해 RHS(rough hard sphere)에 기초한 자유부피모델인 Matthews-Akgerman식이 잘 일치하는 상관식인 것으로 확인되었다. Supercritical fluid chromatographic method was recommended as an alternative separation method of fatty acids of the conventional method such as distillation or extraction. Although diffusion characteristics are varied by the carbon numbers and the degree of unsaturation of fatty acids, the quantitative data were so rare that the commercialization of supercritical fluid chromatographic method has been hindered. In this study, diffusion coefficients of fatty acids which are differently unsaturated are measured by CPB method in the range of 308.15K to 328.15K and 13MPa to 17MPa in supercritical carbon dioxide. A decrease in the binary diffusion coefficient was observed with an increase in temperature and pressure. Also, the decrease in the binary diffusion coefficient with increasing fluid density and viscosity. Wilke-Chang equation, Funazukuri empirical equation, and Matthews-Akgerman equation are used to correlate the experimental diffusion coefficients of fatty acids in supercritical carbon dioxide. Amongthe various theoretical equations, Matthews-Akgerman equation based on RHS theory was suggested as a more successful correlation model with experimental data.
이승범,김진형,주천기,Seung-Bum Lee,Jin-Hyoung Kim,Choun-Ki Joo 대한안과학회 2005 대한안과학회지 Vol.46 No.10
Purpose: To evaluate the reproducibility of the flap thickness in LASIK using Moria M2 microkeratome and to examine the safety and the complication rate intraoperatively and postoperatively. Methods: 92-Ninety-two consecutive eyes of 50 patients that received LASIK using the Moria M2 microkeratome were reviewed. The mean of the predictable corneal flap thickness was compared with the mean of the created corneal flap thickness, and intraoperative and postoperative complication and safety were evaluated. Results: The average corneal flap thicknesses were 140±15.16 μm with 130 μm head and 108.01±16.72 μm with 110 μm head. There was no statistically significant correlation between the predictable corneal flap thickness and the created corneal flap thickness with the 130 μm head (p=0.001, one-sample t-test), but there was a stastistically significant correlation with the 110 μm head (p=0.573, one-sample t-test). Conclusions: The M2 Moria microkeratome created a desirable thickness with the 110 μm head, and we can expect postoperative stability of the remaining corneal thickness. The complication rate both intraoperatively and postoperatively was very low.