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Ethylenediaminetetraacetic acid(EDTA)항응고제에 의한 Mean Corpuscular Volume(MCV)변화
홍승민,박영진,최하영,임진,정옥연,이호준,이호영,장숙진,문대수 朝鮮大學校 附設 醫學硏究所 1996 The Medical Journal of Chosun University Vol.21 No.2
It is essential that we put the anticoagulant into the blood specimen of the CBC test. However, the value of some parameters in the CBC test can be changed whenever using some anticoagulants. EDTA anticoagulant is mostly used these days. There are 3 kinds of EDTA, that is K_(2-), K_(3-), and Na_(2-) EDTA. The author studies how many effects each the EDTA gets into the true value of blood specimen for MCV of RBCs. Especially we compared the MCV effect of different concentrations of 3 EDTA anticoagulants on the bias with time and instrument. Some results are gotten. In our results, K_(3-)EDTA anticoagulant shows more satisfactory MCV value than K_(2) or Na_(2-)EDTA. On using concentration of EDTA, 1.5㎎ EDTA/㎖ of blood show more satisfactory MCV value than 7.5㎎ EDTA/㎖ of blood. However, the choice of anticoagulant may be dependant on the different instruments.
리니어 모터로 이송되는 탄성체의 진동 최소화를 위한 이송속도 최적화 연구
최영휴,홍대선,최응영,최국진 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
Linear motor feed drive systems have been broadly used in machine tools or precision automatic systems. Recently, modern machine tools require high speed and high precision feed drive system to achieve high productivity. Unfortunately, a feed drive system, even though it was designed optimally, may experience severe transient vibrations during high-speed operation if its feed rate control is unsuitable. A rough feed rate curve having discontinuity in its acceleration profile causes serious vibrations in the feed slides system. This paper presents a feed rate optimization of a machine tool feed slide system, which is driven by a linear motor, for its minimum vibrations. Firstly, a 4-degree-of-freedom lumped parameter model is proposed for the vibration analysis of a linear motor driven machine tool feed drive system. Next, a feed rate optimization of the feed slide is carried out for minimum vibrations. The feed rate curve optimization strategy is to find out the most appropriate acceleration profile with jerk continuity. Of course, the optimized feed rate should approximate to the desired one as possible. A genetic algorithm with variable penalty function was used in this feed rate optimization.
鉛暴露 作業者의 鉛中毒 早期發見을 위한 集團檢診法 改善方案에 관한 硏究
홍대용,김장락,정주화,최현림,윤형렬 慶尙大學校 1995 論文集 Vol.34 No.1
This study was carried out to evaluate the feasibility of current lead indicators used in screening lead who were sspeted to have been exposed to lead were selected as 'case'and 207 female workers from non-lead industry were selected for 'control'. The results obtained were as follows: 1. The mean values of blood lead for case and control were 31.4㎍/dl, 22.2㎍/dl,respectively. The difference observed in the mean concentration between case and control was statistically signifi-ant(P<0.01) 2. The mean values for blood ZPP by hematofluorometer for case and control were 31.3㎍/dl, 25.4㎍/dl,respectiely. And difference between two groups was statistically significant(P<0.01). 3. No statistically significant correlation was found between working duation and blood lead, blood ZPPlovel. 4. According to the simple correlation analysis,ZPPand urine lead were found to be statistically correlated with blood lead(P<0.01) 5. According to the discriminant analysis using blood lead as a dependent variable, it showed 89.1% predictability when using 40㎍/dl as a cutting value which is used as a screenig cutting value for industry workers health examination, while 81.8% for 30㎍/dl,77.54% for 20㎍/dl, respectively. 6. Lead related simptons which is used for screening the lead ntoxicated patients were used as a dependent variables in multiple regression analysis to find useful lead indicator. And significant independent variables were found to be ZPP, Age, and Hct. 7. Above results suggest that objective evalution of feasibbility of several lead indicators should be developed to correct the disutility of current lead screeng system in Korea.
개심술(開心術)의 임상적 고찰 : 치험 200예 200 Cases
최형호,서홍주,임영혁,김정중,배대양,이석기,임진수 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.2
Background and Objectives: Two hundred cases of the open heart surgery due to congenital and acquired heart disease were done using the cardiopulmonary bypass in the Department of Thoracic and Cardiovascular surgery, Chosun University Hospital from November, 1980 to June, 2001. Material and Methods: The number of congenital heart disease was 132 cases. 68 cases were acquired heart disease. 'The age of the congenital heart disease was from 22 days to 45 years. In the acquired heart disease, the age was from 14 to 72 years. Result: Congenital heart disease consisted of 113 congenital acyanotic heart disease, 19 congenital cyanotic heart disease. Corrective operation was done for congenital heart disease with 4. 5 % operative mortality. Of 68 cases acquired heart disease, 44 patients were valvular heart disease, 3 cardiac tumors, 9 ischemic heart diseases, 12 aortic dissections and etc. The operative mortality was 13%. Conclusion: The postoperative complications were appeared in 68 cases and the complications were wound infection, occipital alopecia, low cardiac output syndrome, arrhythmia, septicemia etc. The mortality after open heart surgery was 15 cases and the causes of death were low cardiac output syndrome, septicemia, respiratory failure and left ventricle rupture.
Pd/C 촉매에 의한 2-(2-hydroxy-5-methyl-phenyl)-2H-benzotriazole 합성 반응의 특성
최주홍,이정원,이대광,이동근 慶尙大學校生産技術硏究所 1994 生産技術硏究所論文集 Vol.10 No.-
The reduction process using Pd catalyst is very attractive in the view points of the simple reaction step and the relatively less discharge of pollutants. The reduction characteristics of o-nitrohydroxyazobenzene(O-NHAB) with Pd/c catalyst was investigated in an autoclave and a reactor operated at atmospheric pressure. The reduction performance of O-NHBA in the auto clave showed high pressure gave good yield for tinuvin P. The maximum yield of tinuvin P based on o-nitroaniline was 63.3%. Some contents of water in the solution improved the reaction rate ad reduced the formation of impurities. Reaction temperature was able to be increased up to 75℃ with the relatively less impurities. The optimum content of NBA was about 10%.
최광배,민대홍,윤진호,김승홍 大韓成形外科學會 1982 Archives of Plastic Surgery Vol.9 No.2
The auricle, diverging from the side of the head, consists of a delicate shell of elastric cartilage between the anterior and posterior of the thin skins. Thus, a radiacl chage in the outlook for the results of ear reconstruction has occured in recent years due to the delicate anatomical specificity. Inspite of the challenge of the many plastic surgeons, successful resconstruction of acquired defects may be extrimely difficult or impossible- especially, in patients who have suffered total traumatic loss of the auricle in which the local soft tissues are destroyed or deeply scarred. We experienced the case of total auricular loss with severe periauricular abrasion and dirty tattooing, and can obtained successful total ear reconstuction using buried cartilage and the distant flap.
최익대,이윤복,박홍채,오기동 부산대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.59 No.-
마그-크롬질 캐스타블에 대한 내알칼리성 증진에 의한 수명 향상의 가능성을 검토하였다. 골재로서 전융 알루미나, 크롬질, 소결 스피넬, 마그-크롬질, 마그네시아질 순으로 알칼리 침식에 대한 저항성이 우수하였다. 마그-크롬질은 다른 골재에 비하여 알칼리에 대한 침식저항성 뿐만 아니라 열충격에 대한 저항성이 양호하였다. 장시간 적용 시험시 β-2CaO · SiO2.3CaO · SiO2 및 K2SO4가 존재하였고 조직 취화를 초래하여 가동면에서 손상을 가속하였다. 전융 마그네시아를 사용한 경우 소결 마그네시아질에 비하여 재질 변경 및 조직 치밀화로 인하여 알칼리에 대한 침식 억제 효과가 있었다. For long life of applications in MgO-Cr2O3 castables, the improvement of chemical resistance against alkali salts were investigated. Chemical resistance against alkali salts was excellent in order, i.e fused alumina, chrom ore, sinterded spinel, Magnesia-chrome, magnesia based castables. magnesia-chrome based tastable was comparatively good in the chemical attacks and the thermal resisatnce. As working for long time, β-2CaO · SiO2, 3CaO · SiO2 and K2SO4 were existed, and they accelerated chemical wear in the working area of magnesia-chrome castables caused the degreaded microstructure. The chemical resistance of fused magnesia in MgO-Cr2O3 castables showed the more excellent than that of the sintered magnesia due to the densification of mircrostructure and the change of materials