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김용철(Yong-Chul Kim),정태영(Tae-Young Chung),전윤호(Yoon-Ho Chun) 한국해양공학회 1994 韓國海洋工學會誌 Vol.8 No.1
The axial and torsional coupled vibration of marine propeller shafts can be mainly caused by actual shape of the crank shaft and hydrodynamic forces and moments due to propellers : the former leads to stiffness matrix coupling and the latter leads to inertia and damping matrix coupling. In the present paper the characteristics of the coupled vibration of marine propeller shafts due to hydrodynamic coupling is investigated in details. First, the modelling procedure of the system and analysis technique are also developed. To verify the present method the numerical calculations were also performed. Finally, the results were compared with existing data in the literature and it was found to be in good agreement.
굴절교정술 후 건성안의 유병률 및 술 후 건성안 발생의 위험인자
손대용(Dae Yong Son),황성순(Sung soon Hwang),현 주(Joo Hyun),임동희(Dong Hui Lim),정의상(Eui Sang Chung),정태영(Tae Young Chung) 대한안과학회 2017 대한안과학회지 Vol.58 No.7
목적: 굴절교정술 후에 발생하는 건성안의 유병률 및 위험인자를 알아보고자 하였다. 대상과 방법: 2010년 3월부터 2014년 2월까지 삼성서울병원 안과에서 굴절교정술을 시행받은 98명, 180안의 의무기록을 후향적으로 분석하였다. 눈물막 파괴시간(tear break-up time)이 5초 미만이거나 안구표면 염색 점수(Oxford stain score)가 2점 이상인 경우를 건성안이라 정의하고, 술 후 건성안의 유병률을 알아보았다. 술 후 건성안군과 술 후 정상안군 간의 차이를 보이는 술 전 인자(인구학적 요인, 술 전 이학적 검사, 수술요인)들을 파악하고, 이를 바탕으로 술 후 건성안 발생의 위험인자들을 분석하였다. 결과: 굴절교정술 후 건성안의 유병률은 62.2%였다. 술 후 정상안군에 비해 술 후 건성안군에서 유의하게 여성의 비율이 높았고 (p=0.016), 연령이 많았으며(p=0.001), 각막 두께가 얇았다(p=0.002). 굴절교정술 후 건성안 발생의 위험 인자에 대하여 분석하였을 때, 술 전 건성안(odds ratio [OR]=9.02, confidence interval [CI]=3.8-21.4)이 수술 후 건성안 발생의 가장 강력한 위험인자로 나타났고, 연령의 증가(OR=1.06, CI=1.01-1.11) 또한 독립적인 수술 후 건성안 발생의 위험인자로 나타났다. 결론: 연령이 증가할수록, 그리고 굴절교정술 전에 건성안이 있을수록, 술 후 건성안 발생의 위험도가 더 증가하는 것으로 확인되었다. 건성안을 동반한 고령의 환자에서 굴절교정술을 시행할 경우, 굴절교정술 후 건성안 발생에 대한 주의 깊은 관찰 및 평가가 필요할 것으로 생각된다. <대한안과학회지 2017;58(7):782-787> Purpose: To assess the prevalence and the risk factors of dry eye disease after refractive surgery. Methods: A retrospective study was performed on 180 eyes of 98 patients based on medical records. Those who had tear break-up time less of than 5 seconds or had an Oxford stain scale equal to or greater than 2 were defined to have dry eye disease. We analyzed the prevalence of dry eye, compared demographic and clinical features of the dry eye group and normal group, and found risk factors of dry eye after refractive surgery. Results: The prevalence of postoperative dry eye was 62.2%. Compared to the normal eye group, the dry eye group had a significantly higher proportion of women (p = 0.016), older age (p = 0.001), and thin cornea (p = 0.002). The most significant risk factor of dry eye after refractive surgery was presence of dry eye before refractive surgery (odds ratio [OR] = 9.02, confidence interval [CI] = 3.8-21.4). Old age was also found to be an independent risk factor of dry eye after refractive surgery (OR = 1.06, CI = 1.01-1.11). Conclusions: The risk of dry eye after refractive surgery was increased in older age and preoperative dry eye disease. In order to prevent post-refractive surgery dry eye, caution should be exercised in middle aged patients with preoperative dry eye disease. J Korean Ophthalmol Soc 2017;58(7):782-787
等電點 電氣泳動法에 의한 벼 種子內 esterase 同位酵素 遺傳子 分析
Moo Young Eun(殷茂永),Yong Kwon Kim(金容權),Yong Gu Cho(趙龍九),Tae Young Chung(鄭泰英) 한국육종학회 1990 한국육종학회지 Vol.22 No.3
The inheritance of esterase isozvmes in rice was identified by controlled crosses and segregation analysis with esterase phenotypes classified. Using the method of isoelectric focusing(IEF), four esterase loci and their allozymes were identified and named as Est Ⅰ-1, Est Ⅰ-2, Est Ⅰ-3, and Est Ⅰ-4. There allozymes at each locus were found. Est Ⅰ-1 locus was controlled by two active dimeric alleles and a null allele. Two monomeric alleles and a null allele were found at both Est Ⅰ-2 and Est Ⅰ-3 locus. Two dimeric alleles and one weak allele were recognized at Est Ⅰ-4 locus. Linkage tests showed that four esterase loci were independent each other.
Young Chan Cho(曺永璨),Tae Young Chung(鄭泰英),Yong Hwan Park(朴用煥),Hak Soo Suh(徐學洙) 한국육종학회 1995 한국육종학회지 Vol.27 No.1
Genetic variation and phylogenetic relationship among twenty four strains of Korean red rice, one foreign red rice and five cultivars (Oryza sativa L.) were investigated at the DNA level by using randomly amplified polymorphic DNA (RAPD) method. Twenty of 23 10-mer primers assayed, produced strong and reproducible DNA bands. The number of amplified bands from each 10-mer primer varied from 2 to 8, with an average of 5.3 bands per primer. However, an average of 0.5 band per primer was polymorphic between a Korean red rice strain and a japonica cultivar. Out of 103 different bands observed among thirty accessions by using fifteen primers, 85(82.5%) were informative to differentiate one or more accessions for the others. Particularly, many polymorphic bands were detected among accessions which detected few polymorphism by RFLP analysis. A dendrogram of the phylogenetic similarities among thirty Korean red rices and cultivars was constructed based on their DNA polymorphisms. Classification of rice accessions based on the results from RAPD analysis was differentiated into two main groups, short grain red rices which include japonica cultivars and long grain red rices which include indica and Tongil-type cultivars. This result was in accordance with previous classifications based on isozyme and RFLP analysis. From genetic analysis of F₁ and F₂ populations of a cross between a japonica cultivar, Nagdongbyeo and a Korean red rice strain with short grain type, Geumleungaengmi 33, RAPD polymorphic bands were dominant and inherited following the Mendelian ratio.
Moo Young Eun(殷茂永),Yong Kwon Kim(金容權),Yong Gu Cho(趙龍九),Young Woo Kim(金永雨),Tae Young Chung(鄭泰英),Hae Chune Choi(崔海椿) 한국육종학회 1989 한국육종학회지 Vol.21 No.4
Using the method of isoelectric focusing in polyacrylamide horizontal slab gels, Korean native rice cultivars, which were collected from Gene Bank of the Rural Development Administration, were analyzed for their five isozyme patterns and classified into the enzymatic groups. Among 259 Korean native rice cultivars screened, 5 esterase(EST), 4 phosphoglucose isomerase(PGI), 4 malic enzyme(ME), 2 hexokinase(HK) and 5 β-amylase(β-AMY) isozyme phenotypes were distinguished. Total 15 enzymatic groups could be classified by combining five enzyme phenotypes. The eleventh enzymatic group 〔EST-ⅡC:ME-Ⅲ:PGI-Ⅱ:HK-Ⅱ:β-AMY-Ⅰ〕 was most frequent (111 cultivars), but only one to three cultivars were found in the 1st-6th, 9th and 13th groups. Over 96% of Korean native rice cultivars were showed the isozyme phenotypes of 〔EST-ⅡC:ME-Ⅲ:PGI-Ⅱ〕.