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나희형,임윤철 연세대학교 산업기술연구소 1994 논문집 Vol.26 No.2
The heat generation mechanism of angular contact ball bearing are analyzed. The heat generation rate and ball temperature of angular contact ball bearing are calculated with respect to the various shaft speed, load and lubrication method. The analysis is focused mainly on the predominant sources of heat generation which are spin-moment, gyro-moment, torque due to applied load and viscous friction torque. The viscosity of lubricant is assumed to be a function of the temperature only and the contact between ball and race is assumed to be elastic. Lumped capacitance method is adopted to compute ball temperature. Effective load is calculated iteratively considering the rate of ball expansion due to the temperature rise.
조선,류소연,박종,강명근,김은숙,김형철,박광희,윤혜은,노희송 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2
Objectives: This study was performed to find the association of cigarette smoking and blood lipid profiles in healthy young adults. Methods: The data was collected by a self-administered questionnaire and health examination in 489 professional soldiers from 6 to 12 May, 2004. The status of cigarette smoking was classified by non-smoking, ex-smoked, ≤4.9, 5-9.9, and ≥10 pack-years. The statistical analysis were used by chi-square test, analysis of variance and analysis of covariates. Results: In status of subjects cigarette smoking, current smoking, ex-smoked, and non-smoking were 71.8%, 11.2%, and 17.0%, respectively, In distribution by amount of smoking, non-smoking, ex-smoked, ≤4.9 pack-years, 5-9.9 pack-years, and ≥10 pack-years were 17.0%, 11.2%, 37.4%, 21.3%, and 13.1%, respectively. At other confounding variables were controlled, total cholesterol and LDL-cholesterol were increased significantly when amount of smoking was increased. However, triglyceride and HDL-cholesterol did not showed statistically significant differences, Conclusion: Smoking has relevant to total cholesterol and LDL-cholesterol and it is need to perform the further study for finding how blood lipid profiles are affected its level by cigarette smoking and to find an influence of cigarette smoking on cardiovascular disease.
The Properties of Cu Thin Films on Ru Depending on the ALD Temperature.
Yoon, Hyeong-Chul,Shin, Jin-Ha,Park, Hwa-Sun,Suh, Su-Jeong American Scientific Publishers 2015 Journal of nanoscience and nanotechnology Vol.15 No.2
<P>The copper thin films were deposited by Atomic layer deposition (ALD) on a ruthenium depending on the substrate temperatures. The substrate deposited Ru and TaN on SiO2 by plasma enhanced ALD (PEALD) before Cu deposition for an adhesion layer between Si and Cu. The copper thin films were deposited 200 cycles. The thickness of Cu was different depending on the substrate temperatures. The properties of copper thin films were investigated by a 4 point probe, SEM, and AFM. TaN and Ru layers were deposited by plasma enhanced ALD (PEALD) for the adhesion layer. Also, TaN and Ru layers were observed as TEM because the thickness was too thin. The thickness and roughness of Cu thin film increased depending on the deposition temperatures but, Cu thin film was not deposited at 110 °C. The best sheet resistance of the copper thin film was obtained at a deposition temperature of 170 °C.</P>
울진 바다목장 강도다리 (Platichthys stellatus)와 넙치 (Paralichthys olivaceus)의 자원평가
윤상철 ( Sang Chul Yoon ),이성일 ( Sung Il Lee ),양재형 ( Jae Hyeong Yang ),윤병선 ( Byoung Sun Yoon ),김종빈 ( Jong Bin Kim ),차형기 ( Hyung Kee Cha ) 한국어업기술학회 2014 수산해양기술연구 Vol.50 No.4
This study was performed to estimate biomass and provide management guidance through population ecological characteristics, including growth parameters, instantaneous coefficients of natural and fishing mortalities, and age at first capture of the starry flounder, Platichthys stellatus and olive flounder, Paralichthys olivaceus of Korea. For describing growth of this species, a von Bertalanffy growth model was adopted. The von Bertalanffy growth parameters estimated from a non-linear regression for starry flounder were L∞=48.25 cm, K=0.16/yr, and t0=-1.48, respectively and those for olive flounder were L∞=86.46 cm, K=0.26/yr, and t0=-0.29, respectively. Biomass of Platichthys stellatus was estimated by direct biomass estimation method was 2.6 M/T, that was estimated by indirect method was 13.4 M/Tt. Those of Paralichthys olivaceus were estimated as 10.1 M/T, 19.3 M/T, respectively. An yield per recruit analysis showed that the current yield per recruit on Platichthys stellatus was about 48.2 g with F=0.646/yr and the age at first capture (tc) 1.35yr, that on Paralichthys olivaceus was about 167.6 g with F=1.121/yr and the age at first capture (tc) 1yr.
Deep Learning-based Prediction of Axial Length Using Ultra-widefield Fundus Photography
Richul Oh(Richul Oh),Eun Kyoung Lee(Eun Kyoung Lee),Kunho Bae(Kunho Bae),Un Chul Park(Un Chul Park),Hyeong Gon Yu(Hyeong Gon Yu),Chang Ki Yoon(Chang Ki Yoon) 대한안과학회 2023 Korean Journal of Ophthalmology Vol.37 No.2
Purpose: To develop a deep learning model that can predict the axial lengths of eyes using ultra-widefield (UWF) fundus photography. Methods: We retrospectively enrolled patients who visited the ophthalmology clinic at the Seoul National University Hospitalbetween September 2018 and December 2021. Patients with axial length measurements and UWF images taken within 3months of axial length measurement were included in the study. The dataset was divided into a development set and a testset at an 8:2 ratio while maintaining an equal distribution of axial lengths (stratified splitting with binning). We used transferlearning-based on EfficientNet B3 to develop the model. We evaluated the model’s performance using mean absolute error(MAE), R-squared (R2), and 95% confidence intervals (CIs). We used vanilla gradient saliency maps to illustrate the regions predominantlyused by convolutional neural network. Results: In total, 8,657 UWF retinal fundus images from 3,829 patients (mean age, 63.98 ±15.25 years) were included in thestudy. The deep learning model predicted the axial lengths of the test dataset with MAE and R2 values of 0.744 mm (95% CI,0.709-0.779 mm) and 0.815 (95% CI, 0.785-0.840), respectively. The model’s accuracy was 73.7%, 95.9%, and 99.2% in prediction,with error margins of ±1.0, ±2.0, and ±3.0 mm, respectively. Conclusions: We developed a deep learning-based model for predicting the axial length from UWF images with good performance.
Hyeong Seop Kim,Heesuk Shin,Chul Ho Yoon,Eun Shin Lee,Min-Kyun Oh,Se-Woong Chun,Seung-Kyu Lim,Hoi Sik Min,Hayoung Byun 대한재활의학회 2021 Annals of Rehabilitation Medicine Vol.45 No.1
Objective To retrospectively review the characteristics of preschool children with speech and language disorders to determine their clinical features and compares the average degrees of language delay based on hospital visit purposes, language developmental delay causes, and maternal language. Methods One thousand one hundred two children (832 males, 270 females) with the chief complaint of language or speech problems who underwent language assessment for the first time were included. Their medical records, including demographic data, language environments, and family history of language problems and other developmental problems, were collected. Furthermore, the results of language and developmental assessments and hearing tests were collected. Results Among the children enrolled in this study, 24% had parental problems and 9% were nurtured by their grandparents. The average degree of language delay did not differ regarding purposes of hospital visits. The average degree of language delay was greatest in children with autism spectrum disorders and least in children with mixed receptive–expressive language disorders. In children with mothers who do not speak Korean as their native language, social quotients in the social maturity scale were less than 70. Conclusion Language environment is an essential factor that may cause speech and language disorders. Moreover, maternal language seems to affect the social quotient of the social maturity scale.
Yoon, Kyung-Chul,Mun, Gui-Hyeong,Kim, Sang-Duck,Kim, Seung-Hyun,Kim, Chan Yun,Park, Ki Ho,Park, Young Jeung,Baek, Seung-Hee,Song, Su Jeong,Shin, Jae Pil,Yang, Suk-Woo,Yu, Seung-Young,Lee, Jong Soo,Lim The Korean Ophthalmological Society 2011 Korean Journal of Ophthalmology Vol.25 No.6
<P><B>Purpose</B></P><P>The aim of this study is to report on preliminary data regarding the prevalence of major eye diseases in Korea.</P><P><B>Methods</B></P><P>We obtained data from the Korea National Health and Nutrition Examination Survey, a nation-wide cross-sectional survey and examinations of the non-institutionalized civilian population in South Korea (n = 14,606), conducted from July 2008 to December 2009. Field survey teams included an ophthalmologist, nurses, and interviewers, traveled with a mobile examination unit and performed interviews and ophthalmologic examinations.</P><P><B>Results</B></P><P>The prevalence of visual impairment, myopia, hyperopia and astigmatism in participants over 5 years of age was 0.4 ± 0.1%, 53.7 ± 0.6%, 10.7 ± 0.4%, and 58.0 ± 0.6%, respectively. The prevalence of strabismus and blepharoptosis in participants over 3 years of age was 1.5 ± 0.1% and 11.0 ± 0.8%, respectively. In participants over 40 years of age, the prevalence of cataract, pterygium, early and late age-related macular degeneration, diabetic retinopathy and glaucoma was 40.2 ± 1.3%, 8.9 ± 0.5%, 5.1 ± 0.3%, 0.5 ± 0.1%, 13.4 ± 1.5%, and 2.1 ± 0.2%, respectively.</P><P><B>Conclusions</B></P><P>This is the first nation-wide epidemiologic study conducted in South Korea for assessment of the prevalence of eye diseases by both the Korean Ophthalmologic Society and the Korea Center for Disease Control and Prevention. This study will provide preliminary information for use in further investigation, prevention, and management of eye diseases in Korea.</P>
Yoon, Sung Chul,Lee, Hye Jin,Ko, Jung Min,Kang, Hee Gyung,Cheong, Hae Il,Yu, Hyeong Gon,Kim, Jae Hyung Korean Society of Medical Genetics and Genomics 2014 대한의학유전학회지 Vol.11 No.1
Bardet-Biedl syndrome (BBS) is a rare ciliopathy generally inherited with an autosomal recessive pattern. BBS is characterized by 6 primary features namely retinal dystrophy, obesity, postaxial polydactyly, renal dysfunction, learning difficulties, and hypogonadism and a wide range of secondary features. To date, mutations in 16 genes have been identified as causative factors for BBS. Among them, the BBS1 and BBS10 genes are major disease-causing genes, and each of these gene mutations presents in more than 20% of all BBS patients. Genotype-phenotype correlations have not been observed in BBS, and there can be phenotypic overlap between BBS and other ciliopathies. In Korea, no molecular, genetically confirmed case of BBS has been reported to date. Herein, we describe the case of the first Korean siblings with BBS resulting from 2 BBS10 gene mutations who showed typical clinical phenotypes, including retinal dystrophy, obesity, intellectual disability, cystic tubular disease, and postaxial polydactyly.