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류명수,백용균,이기연 한양대학교 의과대학 1985 한양의대 학술지 Vol.5 No.1
Presented in this paper is the data from a chromosome examination of 268 patients referred for suspected chromosomal abnormalities. Karyotypes were obtained using short-term blood culture and conventional staining and G-banding methods. Of these, 180 patients had normal chromosome complements; 84 (31.3%) a major chromosome abnormality; and 4 (1.5%) a minor chromosome anomaly, giving a total of 88 (32.8%) patients with a major chromosome abnormality or distincitive chromosome variant. Among all patients with chromosome abnormalities, 70 (79.5%) had aberrations of chromosome number (aneuploids), the others had aberrations of chromosome structure; and 9.1% of these (8 out of 88) were mosaic of a normal and an aberrant cell lines. Five had a chromosome rearrangement; 3 of them were reciprocal and 2 Robertsonian translocations. Two patients with pericentric inversions and 4 with isochromosomes were observed. There were 4 patients with partial deletion of a chromosome. One patient with a ring chromosome was observed and another patient had partial deletion of a chromosome along with a characteristic marker. In addition, one patient was found to be carrying a distinctive chromosome variant (15p+). Thus the results of the present study indicate the importance of cytogenetic evaluation in clinically abnormal patients.
류성기 慶尙大學校 1997 論文集 Vol.36 No.-
This paper deals with reliable estimation of bending fatigue strength in carburized spurgears. The constant stress amplitude fatigue test is performed by using an electrohydraulic sevo-controlled pulsating tester. The SN curves are obtained and the enhancement of fatigue strength due to carburized treatment is discussed. In this study, the improvement of fatigue strength is assumed to be caused by an increase of both hardness and residual stress, and an experimental formula has been proposed for the estimation of bending fatigue strength of carburized gears. The strength of tested gears are estimated by substituting the hardness and residual stress into proposed formula, and the results confirm the validity of the proposed formula.
Park, S.J.,Kim, B.J.,Seo, D.I.,Rhee, K.Y.,Lyu, Y.Y. Elsevier Sequoia 2009 Materials science & engineering. properties, micro Vol.526 No.1
In this study, montmorillonite (MMT) was modified using silane coupling agents (SCAs) to improve its interfacial adhesion to an epoxy matrix. The effects of the SCAs on the mechanical interfacial properties of MMT/epoxy nanocomposites were investigated by FT-IR, XRD, and TEM and with reference to the surface energetics. In the results, the SCAs led to an improvement of the organic functional groups, including the silanol and siloxane groups, on the MMT surfaces. This surface modification also led to an enhancement of the specific component of the surface free energy of the MMT. Regarding the mechanical interfacial properties, the critical stress intensity factor (K<SUB>IC</SUB>) and interlaminar shear stress (ILSS) values for all of the treated MMT/epoxy composites were enhanced; those of the γ-amino propyl triethoxy silane (APS)-treated MMT/epoxy composite showed the highest values of 3.55MPam<SUP>½</SUP> and 13.8MPa, respectively.
Foaming 조건에 따른 PMMA microcellular foam의 구조 연구
김영식,배효광,유성구,정종훈,서길수 한국공업화학회 2002 응용화학 Vol.6 No.1
Supercritical carbon dioxide is known to swell and plasticize poly(methyl methacrylate), PMMA, dramatically. In this paper, a basic characterization of the solid-state foam processing is presented. Experiments were conducted in order to determine the effect of foaming temperature and foaming time on cell structures, cell density, and so on. As a result, Higher foaming temperature and foaming time generated larger cell size, and lower cell density.
최현국,유성구,서길수,강재현 한국공업화학회 2000 응용화학 Vol.4 No.2
There have been significant developments in the pillaring of lamellar ionic materials, and the resulting zeolite-like pillared derivatives have built a large family of microporous materials. The intercalation of cubic octomer derived from the controlled hydrolysis of 3-amino propyltriethoxysilane with smectite clays has been studied. The organosilicon are adsorbedd in amounts exceeding the cation exchange capacity of mineral. The excess quantityis incorporated in the form of pysically adsorbed ion pairs [(H₃N-Pr)_8O_(12)Si_8](OH)_8.
Shear Thickening Polishing of Black Lithium Tantalite Substrate
B. H. Lyu,Q. Shao,W. Hang,S. H. Chen,Q. K. He,J. L. Yuan 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.9
To achieve high efficiency in the polishing process to obtain a high surface quality of black LT substrate (a kind of soft brittle material), shear thickening polishing (STP), which is a “gentle” finishing process developed in recent years, was employed in this study. The influence of three key parameters in the STP process including polishing speed, diamond abrasive size and diamond abrasive concentration were analyzed. To investigate the potential mechanical effect of the nanometre abrasive, nano-SiO 2 abrasive particles were added in the slurry, and the concentration of SiO 2 abrasive was also taken as a factor. Taguchi method was utilized to evaluate the influence of the four factors and optimize the polishing conditions. The surface roughness (Ra/Rz) was used as the evaluation index, and the optimized polishing conditions were verified through experiments. Diamond abrasive size has the most significant effect on Ra/Rz, followed by diamond abrasive concentration and then SiO 2 concentration, as the polishing speed has been selected and limited in a small variation rang according to the previous study. Based on the S/N average response analysis, the surface quality is the best under the conditions with 8000# diamond abrasive, 5 wt% diamond abrasive concentration, 90 rpm polishing speed and 10 wt% SiO 2 concentration. After 4 min polishing, the surface roughness Ra/Rz is reduced rapidly from 200.5/1374.6 to 4.2/22.1 nm without embedded abrasive particles on the surface of the black LT substrate. It also shows that the mechanical effect plays a dominant role in the material removal. A certain amount (10 wt% in this study) of nano-SiO 2 can reduce friction between solid colloidal and workpiece, and helps to improve surface quality.
원자로 스팀 제너레이터 홀의 수리 및 자동 검사를 위한 원격제어 로봇시스템 설계
정원용,김종규,한성현,류소평,정동연 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.2
In this paper, we propose a new approach to the development of the automatic vision system to examine and repair the steam generator tubes at remote distance. In nuclear power plants, workers are reluctant of works in steam generator because of the high radiation environment and limited working space. It is strongly recommended that the examination and maintenance works be done by an automatic system for the protection of the operator from the radiation exposure. Digital signal processors are used in implementing real time recognition and examination of steam generator tubes in the proposed vision system. Performance of proposed digital vision system is illustrated by simulation and experiment for similar steam generator model.
정종훈,정희정,유성구,최현국,서길수 한국공업화학회 2002 응용화학 Vol.6 No.1
Poly(acrylic acid)/Na-MMT superabsorbent nanocomposite was synthesized. Acrylic acid(AA) used as a monomer, N,N'-methylenebis-acrylamide was used as a crosslinker, and potassium persulfate was used as an initiator. Absorption amount of water at the superabsorbent nanocomposite was 311 to 801 times of' superabsorbent nanocomposite weight. Superabsorbent nanocomposite with a water absorbency higher than 801g H_2O/g was synthesized having 0.10 wt% crosslinker, 1.8 wt% initiator, 10 wt % Na-MMT, a neutralization degree of 65 % and a reaction temperature of 70℃.