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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 Yong Jin,Injae Hong,Jung Hoon Bae,Chul Seung Lee,Seung Rim Han,Yoon Suk Lee,In Kyu Lee 대한외과학회 2021 Annals of Surgical Treatment and Research(ASRT) Vol.101 No.6
Purpose: This study was performed to evaluate complications using comprehensive complication index (CCI) in colorectal cancer patients with implementation of the Enhanced Recovery After Surgery (ERAS) protocol, and to investigate the predictive factors associated with high morbidity rates. It can be used as a safety net in determining the timing of discharge. Methods: A total of 335 consecutive patients who underwent elective colorectal cancer surgery between January 2017 and December 2017 at a single tertiary center were enrolled. Postoperative complications were defined as occurring within 30 days after surgery. The predictive factor analysis for the high CCI group was also performed. Results: In total, 116 patients experienced postoperative complications. Wound-related complications and postoperative ileus were the most common. The mean CCI for overall colorectal cancer surgery was 9.1 ± 16.7. Patients featuring low CCI (<26.2) were 297 (88.7%) and high CCI were 38 (11.3%). In multivariable analysis, obstructive colorectal cancer (odds ratio, 3.278; 95% confidence interval, 1.217–8.829; P = 0.019) and CRP value on postoperative day (POD) 3–4 (odds ratio, 1.152; 95% confidence interval, 1.036–1.280; P < 0.010) were significant predictors for high CCI. Conclusion: The clinical usefulness of CCI in colorectal cancer patients with the ERAS protocol was verified, and it can be used for surgical quality control. More cautious care is needed and the timing of discharge should be carefully determined for patients with obstructive colorectal cancer or POD 3–4 CRP of ≥6.47 mg/dL.
Yoon, Jooil,Lee, Hyun Chul,Joo, Han Gyu,Kim, Hyeong Seog Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.11
The methods and performance of a 3D pin-by-pin neutronics code based on the 2D/1D decoupling method are presented. The code was newly developed as an effort to achieve enhanced accuracy and high calculation performance that are sufficient for the use in practical nuclear design analyses. From the 3D diffusion-based finite difference method (FDM) formulation, decoupled planar formulations are established by treating pre-determined axial leakage as a source term. The decoupled axial problems are formulated with the radial leakage source term. To accelerate the pin-by-pin calculation, the two-level coarse mesh finite difference (CMFD) formulation, which consists of the multigroup node-wise CMFD and the two-group assembly-wise CMFD is implemented. To enhance the accuracy, both the discontinuity factor method and the super-homogenization (SPH) factor method are examined for pin-wise cross-section homogenization. The parallelization is achieved with the OpenMP package. The accuracy and performance of the pin-by-pin calculations are assessed with the VERA and APR1400 benchmark problems. It is demonstrated that pin-by-pin 2D/1D alternating calculations within the two-level 3D CMFD framework yield accurate solutions in about 30 s for the typical commercial core problems, on a parallel platform employing 32 threads.
( Hyeong In Kim ),( Dong Lim Seol ),( Min Young Choi ),( Ji Yeon Seo ),( Young Chul Yoon ),( Soon Ho Cheong ),( Ki Jung Ahn ),( Mi Seon Kang ),( Won Hee Jang ),( Young Il Yang ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.1
Ionizing radiation produces both acute and delayed effects on skin and subcutaneous tissues, resulting in profound impairment in wound healing. Adipose tissue-derived stem cells(ASCs) have the potential to differentiate into different cell lineages and could be used to repair numerous injured tissues. We examined whether intradermal injection of ASCs would improve the impaired wound healing in irradiated mice. Mice were locally irradiated to the hindlimb to induce radiation dermatitis. Four weeks after irradiation, syngeneic ASCs were delivered into intradermal area of irradiated skin. To assess the effect of the ASCs injection, phenotypic and morphologic analyses and blood flow rate were assessed. The phenotypic analysis showed a progression from erythema to ulceration in irradiated mice. However, irradiated mice injected with ASCs displayed a complete healing of the epidermis and restoration of dermal components. CD31+ microvessels were significantly increased in irradiated mice injected with ASCs compared to those injected with PBS(p<0.05). Inaddition, blood flow rate was higher in irradiated mice injected with ASCs than those injected with PBS(p<0.01). The injected ASCs mostly located in dermis and formed vimentin-positive stromal cells. A few injected ASCs were incorporated into microvasculatures. In conclusion, ASCs could be used as useful cell therapeutics to accelerate wound healing in radiation-induced tissue damage.