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Hematite의 還元速度에 미치는 Al₂O₃, CaO, SiO₂의 影響
金東義,尹秉河,朴漢赫 경북대학교 공과대학 1985 工大硏究誌 Vol.14 No.-
Reduction of hematite by H_2 and CO-CO_2 gas was performed at 800℃, 900℃, 1000℃ after the addition of Al_2O_3, CaO and SiO_2 as an impurity substances. The reduction rate was appeared maximum by CaO and minimum by Al_2O_3 addition, when their amounts were equal at any temperatures, and regardless of the kinds of foreign oxides, the effects on the reduction rate revealed maximum, when the amount was about 1.0wt%. The reduction rate by the mixed control rate equation was showed straight lines by adopting the values of De and Kr from those experimental data. As the results, effects on the reduction rate when hematite contains foreign oxides, such as Al_2O_3, CaO and SiO_2, at high temperature, it was controlled by chemical reaction, and at low temperature it was controlled by interparticle pore diffusion.
김태식,윤한용,임명환,정의정 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-
Many researchers have made a lot of progress in studying the evaluation of fracture probability of brittle materials. However, studies of fracture probability for elastic-plasticity have not been made yet. An evaluation method for fracture probability which is grafted onto a 2-parameter criterion and statistical probability analysis is not only introduced in this study, but also applied to the simple 2-dimensional model and carbon steel piping to evaluate the effect of statistical variables.
임명환,정의정,윤한용 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
Bending and fracture damages occur on marine propellers in services. A method by heating and hammering is generally used to repair the propellers. However, it is inevitable that the strength is degraded by using the method. A new method to increase the fatigue strength of propeller materials was suggested in the previous study. In this study, we adapted the method to repair bended propeller materials and proved its usefulness by the static and fatigue testing.
Choi, Ui-Yoon,Han, Seung Beom,Lee, Soo Young,Kang, Jin Han,Kim, Sun Mi,Ma, Sang Hyuk The Korean Pediatric Society 2012 Clinical and Experimental Pediatrics (CEP) Vol.55 No.11
Purpose: We phylogenetically analyzed the Escherichia coli strains isolated from children with urinary tract infection (UTI) in 2 regions of Korea. Virulence factors (VFs) and antibiotic resistance of the strains were also determined to compare the possible differences. Methods: A total of 138 E. coli strains were collected from the 2 regions; Gyeongin (78 strains) and Gyeongnam (60 strains). The phylogenetic groups were determined using the triplex polymerase chain reaction (PCR) method and multiplex PCRs were used to detect 7 VFs genes (fimH, papC, iutA, hlyA, sfa/focDE, afa/draBC, and kpsMT II). We also tested for antibiotic resistance. Results: Phylogenetic groups, B2 (61.6%) and D (26.8%), comprised the majority of all isolated strains. Regional comparisons revealed that more B2 strains and fewer non-B2 (A+B1+D) strains were found in Gyeongnam, than in the Gyeongin region (P=0.033), and certain VFs were predominantly detected in Gyeongnam (P<0.05). Neither regional nor phylogenetic differences, in antibiotic resistance of the strains, were significant. Conclusion: We were able to confirm that the geographic location is an important determinant of the distribution of the phylogenetic groups and VFs among the E. coli strains that cause UTI in children.
Long-term follow-up of Fanconi anemia: clinical manifestation and treatment outcome
Yoon, Byung Gyu,Kim, Hee Na,Han, Ui Joung,Jang, Hae In,Han, Dong Kyun,Baek, Hee Jo,Hwang, Tai Ju,Kook, Hoon The Korean Pediatric Society 2014 Clinical and Experimental Pediatrics (CEP) Vol.57 No.3
Purpose: The aim of this study was to characterize Korean patients with Fanconi anemia (FA), which is a rare but very challenging genetic disease. Methods: The medical records of 12 FA patients diagnosed at Chonnam National University Hospital from 1991 to 2012 were retrospectively reviewed. Results: The median age at diagnosis was 6.2 years. All patients showed evidence of marrow failure and one or more physical stigmata. Chromosome breakage tests were positive in 9 out of 11 available patients. The median follow-up duration was 69.5 months. The Kaplan-Meier (KM) survival of all patients was 83.3% at 10 years and 34.7% at 20 years, respectively. Seven patients underwent 9 stem cell transplantations (SCTs). Among them, 5 were alive by the end of the study. Ten-year KM survival after SCT was 71.4% with a median follow-up of 3.4 years. All 5 patients treated with supportive treatment alone died of infection or progression at the median age of 13.5 years, except for one with short followup duration. Acute leukemia developed in 2 patients at 15.4 and 18.1 years of age. Among 6 patients who are still alive, 3 had short stature and 1 developed insulin-dependent diabetes mellitus. Conclusion: We provide information on the long-term outcomes of FA patients in Korea. A nation-wide FA registry that includes information of the genotypes of Korean patients is required to further characterize ethnic differences and provide the best standard of care for FA patients.
초미세 틈새의 기체 베어링 해석용 유효 점도의 표현식과 관련 계수들의 민감도 해석
김의한(Ui Han Kim),임윤철(Yoon Chul Rhim) 한국트라이볼로지학회 2014 한국윤활학회지(윤활학회지) Vol.30 No.1
A more accurate expression for effective viscosity is obtained using a linear regression of the data from Fukui-Kaneko’s model, which are obtained through numerical calculations based on the linearized Boltzmann equation. Veijola and Turowski’s expression is adopted as a base function for effective viscosity. The four coefficients in that equation are optimized, and sensitivity analysis is conducted for these coefficients. The results show that the coefficient for the first-order Knudsen number is the most accurate, whereas the coefficient in the exponential of the Knudsen number is the least accurate compared with Fukui-Kaneko’s results. The expression for effective viscosity is accurate within 0.02% rms of Fukui-Kaneko’s results for the inverse Knudsen numbers from 0.01 to 100 and surface accommodation coefficients ranging from 0.7 to 1.
프로필티오유라실 (Propylthiouracil)과 연관된 p-ANCA 양성 혈관염에 동반된 초점성 분절성 사구체 경화증
박윤경 ( Yoon Kyung Park ),윤여욱 ( Yeo Wook Yun ),성상석 ( Sang Suk Sung ),박의순 ( Ui Soon Park ),박성현 ( Sung Hyun Park ),우진현 ( Jin Hyun Woo ),박재일 ( Jae Il Park ),장선주 ( Sun Joo Jang ),한상웅 ( Sang Woong Han ),오영하 대한신장학회 2004 Kidney Research and Clinical Practice Vol.23 No.6
초미세 틈색의 기체 베어링 해석용 유효 점도의 표현식과 관련 계수들의 민감도 해석
김의한(Ui Han Kim),임윤철(Yoon Chul Rhim) 한국트라이볼로지학회 2013 한국트라이볼로지학회 학술대회 Vol.2013 No.10
A most accurate expression for the effective viscosity is obtained using the linear regression of the data from Fukui-Kaneko’s model which are obtained through numerical calculations based on the linearized Boltzmann equation. Veijola and Turowski"s expression is adopted as a base function for the effective viscosity and four coefficients in that equation are optimized. The sensitivity analysis is conducted for four coefficients. As a results, the coefficient for the first order of Knudsen number is the most and the coefficient in exponential of Knudsen number is the least effective in error compared with the results of Fukui-Kaneko"s results. The expression for the effective viscosity is accurate within 0.02% rms of Fukui-Kaneko"s results for the inverse Knudsen number range from 0.01 to 100 and the range of surface accommodation coefficient from 0.7 to 1.
Alveolar bone height according to the anatomical relationship between the maxillary molar and sinus
Choi, Yoon Joo,Kim, Young Hyun,Han, Sang-Sun,Jung, Ui-Won,Lee, Chena,Lee, Ari,Jeon, Kug Jin Korean Academy of Periodontology 2020 Journal of Periodontal & Implant Science Vol.50 No.1
Purpose: The aim of this study was to investigate the available alveolar bone height between the maxillary molars and the sinus floor according to their anatomical relationship using cone-beam computed tomographic (CBCT) images. Methods: A total of 752 maxillary first (M1) and second molars (M2) on CBCT scans of 188 patients were selected. First, each maxillary molar was categorized as type 1, 2, 3, or 4 according to the relationship of the molar root with the maxillary sinus floor. The frequency distribution of each type was analyzed. Second, the shortest vertical distance (VD) of each molar was measured from the furcation midpoints of the roots to the lowest point of the sinus floor by 2 observers. Intraclass correlation coefficients and the t-test were calculated for the VD measurements. Results: For M1, type 3 was the most frequent, followed by type 2. For M2, type 3 was the most common, followed by type 1. The VD measurements of type 1 were 9.51±3.68 mm and 8.07±2.73 mm for M1 and M2, and those of type 3 were 3.70±1.52 mm and 4.03±1.53 mm for M1 and M2, respectively. The VD measurements of M2 were significantly higher in female patients than in male patients. Conclusions: Type 3 was the most frequent anatomical relationship in the maxillary molars, and showed the lowest alveolar bone height. This information will help clinicians to prevent complications related to the maxillary sinus during maxillary molar treatment and to predict the available bone height for immediate implant planning.