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심운택,이종연,오장균,조영채 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.1
A questionnaire survey was conducted on 572 taxi drivers in Taejeon City to investigate the prevalence rate which was derived from the subjective symptoms of respondents according to the working condition and daily life effected on health. The disease were classified the cardiovascular disease, gastrointestinal disease, neurotic disease and musculoskeletal disease according to the subjetive symptoms. The results obtained were as follows : 1. Among the subjective symptoms. the complaint rate of latigability, eye strain, loss of appetite, irritability, dizziness on standing, stiffness on shoulder. and low back pain became decreased in that order. 2. The prevalence rates of cardiopulmonary and gastrointestinal disease were low in the old aged group, and the prevalence rates of all disease was proportional to the frequencies of accident experience. but no evident trend in job conditions. 3. The groups having regular meal time and rest after meal showed low prevalence rate in all disease. The sleeping time and smoking habit were related to the neurotic and cardiopulmonary disease. 4. The group of usual drug intake occupied 68% of all studied subjects, the age group of 40 or more and the group of having G-1 disease showed high rats of usual drug intake.
선반 기어박스의 기어열 - 축계 진동 해석 및 저감에 관한 연구
최영휴,박선균,배병태,정택수,김청수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
In this study, torsional and lateral vibrations of a gear box transmission system were analyzed theoretically using some mathematical models and examined to determine the causes of its excessive vibrations. As the results, it was found there exist possibility of resonance between gear mesh frequencies and lateral vibration mode of the transmission shaft during the third shifting mode operation. In order to avoid this resonance, we proposed changing the arrangement of gears on the transmission shaft. The measured vibration levels of the improved gear box were dramatically reduced. These results may be helpful to design a machine tool gear box with low noise and vibration.
NC선반 기어박스의 기어열 : 축계 진동해석 Spindle System for an NC Lathe Gear Box
최영휴,박선균,배병태,정택수,김청수 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
In this study, two mathematical models are first constructed to analyze vibration characteristics of a gear train - spindle system of an NC lathe gear box. One is a lumped parameter model which is used for calculating natural frequencies of the torsional vibration, the other is a finite element model for analyzing lateral vibration and critical speeds of the spindle system. In addition, this study examines some possible resonance conditions such as gear mesh frequencies, IX shaft rpm frequencies over whole operating speed range, and so on. The results may be helpful to design a machine tool gear box with low noise and vibration.
Microstructure and properties of cross-roll rolled and heat treated metastable TiNbSn alloy.
Jung, Taek-Kyun,Choi, Ho-Joon,Kim, Kyung-Taek,Shin, Young-Chul,Lee, Hyo-Soo,Lim, Sung-Chul,Kwon, Hyouk-Chon,Hanada, Shuji American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.10
<P>A (Ti-35mass%Nb)-4mass%Sn alloy was cross-roll rolled with a reduction ratio of 70% in which the roll axes are tilted by 5 degrees away from the transverse direction of the rolled sample and then aged at 250 degrees C for 2 h. Cross-roll rolling was found to increase yield strength and Young's modulus, simultaneously. Yield strength was higher in cross-roll rolled than in conventionally rolled at same reduction ratio. Yield and tensile strength further increased by a low temperature ageing by ψ precipitation hardening and microstructure refinement. Yield and tensile strength of the aged 70% cross-roll rolled sample were higher than those of the aged 70% conventionally rolled one.</P>
Role of NADH: quinone oxidoreductase-1 in the tight junctions of colonic epithelial cells
( Seung Taek Nam ),( Jung Hwan Hwang ),( Dae Hong Kim ),( Mi Jung Park ),( Ik Hwan Lee ),( Hyo Jung Nam ),( Jin Ku Kang ),( Sung Kuk Kim ),( Jae Sam Hwang ),( Hyo Kyun Chung ),( Min Ho Shong ),( Chul 생화학분자생물학회(구 한국생화학분자생물학회) 2014 BMB Reports Vol.47 No.9
NADH: quinone oxidoreductase 1 (NQO1) is known to beinvolved in the regulation of energy synthesis and metabolism, and the functional studies of NQO1 have largely focused on metabolic disorders. Here, we show for the first time that compared to NQO1-WT mice, NQO1-KO mice exhibited amarked increase of permeability and spontaneous in flammationin the gut. In the DSS-induced colitis model, NQO1-KO miceshowed more severe inflammatory responses than NQO1-WTmice. Interestingly, the transcript levels of claudin andoccludin, the major tight junction molecules of gut epithelialcells, were significantly decreased in NQO1-KO mice. The colons of NQO1-KO mice also showed high levels of reactiveoxygen species (ROS) and histone deacetylase (HDAC) activity, which are known to affect transcriptional regulation. Takentogether, these novel findings indicate that NQO1 contributesto the barrier function of gut epithelial cells by regulating the transcription of tight junction molecules.