PCB 드릴링용 스핀들을 위한 공기 베어링의 최적 설계에 관한 연구

배명일,김형철,김기수 충남대학교 공업교육연구소 2001 論文集 Vol.24 No.1

In this study, the stiffnesses of aerostatic thrust and radial bearings for PCB drilling are analyzed using system of experiment. The results are as follows: the stiffnesses of aerostatic thrust bearing are affected by input air pressure, clearance, number of nozzle. Also, the stiffnesses of aerostatic radial bearing are affected by input air pressure, diameter of nozzle, length of bearing. A recommended design conditions for aerostatic thrust bearing are as follow: input air pressure 7kg_(f)/cm^(2), clearance 0.02mm, diameter of nozzle 0.2mm, number of nozzle 7, bearing inner diameter 26mm and input air pressure 7kg_(f)/cm^(2), clearance 0.015mm, diameter of nozzle 0.2mm, bearing length 45mm, distance of nozzles 10.5mm for aerostatic radial bearing.

임상 증상이 심하지 않은 심낭 삼출 환자의 장기 추적 결과

배장호,김기식,강미숙,남명희,김미정,김민수,김기영,님창욱,김윤년,김권배,정시전,김여희 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.7

서울敎育大學敎 學內 電算網 構築 方案에 관한 硏究

裵鍾洙,洪命熹,張豪演 서울교육대학교 과학교육연구소 1994 科學과 數學敎育 論文集 Vol.20 No.-

호산구성 육아종에 병발된 동맥류성 두개골 골낭종 : 증례보고 Case Report

길승배,허철,변진수,한용표,김헌주,홍순기,김명순,홍순원,김윤미 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.9

A case of aneurysmal bone cyst(ABC1 secondary to eosinophilic granuloma of the skull is reported. In the skull the presence of ABC secondary to eosinophilic granuloma is rare. We reviewed the clinicopathological and radiological features of this type of eocinophilic granuloma at the cranium.

수치해석에 의한 복개터널 라이닝의 변위거동

이명욱,박병수,전용배,유남재 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A

This paper is results of experimental and nunerical works on the behavior of the cut-and-cover tunnel. Centrifuge model tests were performed to simulate the behavior of the cut-and-cover tunnels having cross sections of national road and subway tunnels. Model experiments were carried out with changing the cut slope and the slope of filling ground surface. Displacements of tunnel lining resulted from artificially accelerated gravitational force up to 40g of covered material used in model tests, were measured during centrifuge model tests. In model tests, Jumunjin Standard Sand with the relative density of 80% and the zinc plates were used for the covered material and the flexible tunnel lining, respectively. Basic soil property tests were performed to obtain it's the property of Jumumjin Standard Sand. Shear strength parameters of Jumunjin Standard Sand were obtained by performing the triaxial compression tests. Direct shear tests were also carried out to find the mechanical properties of the interface between the lining and the covered material. Numerical analysis with the commercially available program of FLAC were performed to compare with results of centrifuge model experiment. In numerical modelling. Mohr-Coulomb elasto-plastic constitutive model was used to simulaye the behavoor of Jumunjin Standard Sand and the interface element between the lining and the covered material was implemented to simulate the interaction between them. Compared results between model tests and numerical estimation with respect to displacement of the lining showed in good agreements.

연질재료의 초고속 정밀 가공 특성에 관한 연구

김기수,배명일 충남대학교 공업교육연구소 2000 論文集 Vol.23 No.1

This paper presents the construction of an ultra-precision machining system and a machining experiments using the developed system. The system is composed of air bearing system, granite bed, air pad, and linear feeding mechanism. The cutting conditions have great effect on the surface quality in ultra-precision machining. The ultra-precision machining is mainly processed by several ㎛ depth of cut and feed rate. For this, tools with sharper cutting edge and less tool wear are needed. To satisfy these requirements, diamond is generally used as a tool material for ultra-precision machining. In order to evaluate the cutting characteristics of the PCD and MCD tools on the aluminum alloy, the machining experiments performed using the developed system.

다시마 액즙 제조

김명희,이영재,강훈이,강동수,김해섭,배태진 여수대학교 1998 論文集 Vol.13 No.2

This study was intended to raise solids yield in the sea tangle extract. Sea tangle extracted by additions of acetone, methyl alcohol, isopropyl alcohol and ethyl alcohol. Among four solvents used for sea tangle extraction, the optimal solvent was ethyl alcohol. The most appropriate method of sea tangle extraction was two-stage extraction, that extracted with addition of ethyl alcohol and residue was extracted with water(1:13, w/v). As the optimal conditions of ethyl alcohol were 25℃ and 70%, respectively. The basis of solids yield in sea tangle extract, optimal extracting time was about 1 hour. The yield of soluble solids under above-mentioned conditions was 18.2%. Drinking product was made by adding 0.1% citric acid, 2% sorbitol and 2% oligosaccharide to the sea tangle extract(Brix 10).

聾啞들의 運動 興味에 대한 調査硏究

金命祚,裵鍾秀 釜山大學校 師範大學 1985 교사교육연구 Vol.10 No.-

The purpose of this study is to find out the way for the deaf-mute to awake their latent faculties and to motivate the spontaneous participation in society through physical education by analyzing the realities of the education for the education for the deaf-mute in Korea and their underatanding or interest in exercise. For this, we passed round questionnaires to 1329 deaf-mutes in Seoul, Pusan and Daegu and analyzed their interest: in exercise as follows; 1. How much are they generally interested ie exercise? 2. How much do they understand exercise? 3. What kind of exercise are they concerned about? As a result, they are much more interested in exercise than we expected. in order to get them to have their total physical development and to develop their latent faculties to the utmost and let them partccipate in socity with a strong intention.

모 축전지 회사 근로자들의 연폭로 지표에 대한 경시적 관찰

강명식,김용배,이용진,리갑수,김화성,황규윤,장봉기,이성수,안규동,이병국 순천향대학교 산업의학연구소 1998 순천향산업의학 Vol.4 No.1

Lead poisoning is still prevalent and one of important occupational disease in Korea. To prevent undue high lead burden and maintain good health condition of lead workers in lead using industries, periodic health examination and regular biological monitoring of lead workers are often required in addition to the fundamental improvement of their working condition. To evaluate the effect of comprehensive occupational health program with regular biological monitoring on the level of lead exposure of lead workers in lead using industries, 11 year database from 1983 to 1994 of one storage battery factory was reviewed. From 1983 to end of 1986 only periodic health examination was provided to the lead workers, but from 1987 comprehensive occupational health program with regular biological monitoring was provided to maintain better health condition of lead workers. Selected study variables for lead exposure were blood lead(PbB), zinc protoporphyrin in blood(ZPP), δ-aminolevulinic acid in urine(ALAU), hemoglobin(Hb), hematocrit(HCT). Information on sex, age and work duration was also reviewed. 5 years data from 1983 to 1987 and 3 years data from 1990, 1993 and 1994 were available for all lead exposure indices except ALAU which has only 5 years data from 1983 to 1997. The results of 11 years longitudinal observation of lead indices are all follows: 1. The mean value of ZPP of lead workers in 1983 was 148.7±73.1 ㎍/㎗(Male: 145.5±72.3, Female: 168.1±79.1), whereas that of ZPP of lead workers in 1994 was decreased to 64.3±32.7 ㎍/㎗(Male: 60.2±28.8, Female: 95.2±43.4). 2. The mean value of PbB of lead workers in 1983 was 56.4±18.8 ㎍/㎗(Male: 55.59±19.1, Female: 59.6±19.1), whereas that of PbB of lead workers in 1994 was dcreased to 35.4±11.9 ㎍/㎗(Male: 35.7±12.0, Female: 32.8±10.8). 3. The mean value of Hb of lead workers in 1983 was 14.1±1.4 g/㎗(Male: 14.4±1.1, Female: 11.7±0.8), whereas that of Hb of lead workers in 1994 was increased to 15.6±1.5 g/㎗(Male: 15.9±1.2, Female: 12.9±1.1). 4. Blood lead is most highly correlated with ZPP(r=0.522, male:0.54 and female:0.50) and also correlated with ALAU and work duration also. 5. The simple regression analysis of PbB and ZPP showed different coefficient of regression by the measurement year, but there was no difference of coefficient of regression between sex. The slope of equation of pooled data for 1983-1986 without comprehensive occupational health program was 2.16 and differed from that of pooled data for 1987-1994(1.25). This difference suggests that the unit effect of blood lead on ZPP was relatively smaller in later period of comprehensive occupational health program than carly period without comprehensive program. The slope change in the analysis of linear regression of PbB on ZPP in lead workers can be used to evaluate the possible effect of health intervention to prevent undue high lead absorption in lead using industries. 6. 11 years occupational health service in this storage battery factory brought out considerable improvement of health status of lead workers in terms of decrease of PbB and ZPP and increase of Hb and the improvement was more remarkable after the introduction of comprehensive occupational health program.

수영 인구의 저변확대를 위한 활성화 방안에 관한 연구

정명수,임효택,손배민 조선대학교 스포츠과학연구소 1999 스포츠科學硏究 Vol.10 No.-

The purposes of this study are to examine characteristics of participants in leasure and sport activities and to explore ways for an increase in swimming population. 850 questionnaires were distributed to 850 adults who had participated in leasure and sport activities at 7 commercial swimming pools in Kwangju. Of these, 813 questionnaires were collected and 790 questionnaires were used for this study. The results were as follows. 1. Most participants in swimming did exercise for health and physical strengthen improvement. Above 1.3-1.6 million won monthly payed-people more participated in swimming than other people. 2. Many people participated in swim between 9 and 12 AM and more than 3-4 times a week. Usually, they went to swimming pools by their own cars and most of them took lesson in swimming. 3. Most sports facility users felt that utility fee was moderate and resting rooms and sports equipment shops were satisfactory, but other subsidiary facilities were not satisfactory dissatisfaction with swimming pool facilities and service of employees revered to be the most barrier to access to swimming pools. Thus, program development by step by step approach for beginners and active investment for convenience facilities might be necessary. And also more active governmental support are needed and public facilities should be established and opened for more people to access more easily to sports facilities.