커패시터 放電 임펄스 着磁機 및 着磁 요크시스템의 定數算定에 관한 硏究

白壽鉉,金 龍,金必洙,尹秀鳳,朴永浩,尹信容 동국대학교 대학원 1992 大學院硏究論集-東國大學校 大學院 Vol.22 No.-

In a capacitor-discharge impulse magnetizer, a magnet is magnetized by the discharging current of capacitor The actual construction of magnetizing fixtures and discharge matching is expensive and time-consuming. Since the parameters of the impulse magnetizer have been determined and the resistance and inductance of such a magnetizing fixture can be easily computed using FEA, it is possible to predict the performance of such a fixture without actually building it. This paper describes that by mathematically modeling the capacitor-discharge impulse magnetizer fixture the problem can be solved with resonable predictability. The basic equations are presented and used to predict the magnetic-field intensity inside the fixtures. Finite-Element-Analysis is also used as part of the design process

하수슬러지를 이용한 복합소재 개발연구

연규석,권윤환,유근우,김남길,김동준,이윤수 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

본 연구는 하수 종말 처리에 의해 발생되는 하수 슬러지를 잔 골재(경량골재)로 사용하여, 폴리머 콘크리트를 제조하여 그 때의 역학적 성질에 대하여 검토하였다. 하수 슬러지는 5일간 110±5℃에서 수분함량 0.1%미만으로 건조한 후 파쇄하여 No.4∼No. 200 번체의 잔골재 표준 시방서 기준에 부합되도록 사용하였다. Pellet는 보통 회전pan에서 만드나, 본 실험에서는 수동으로 제조하였다. 제조한 하수 슬러지 경량 골재는 평균 겉보기 비중은 1.58(g/㎤), 단위용적중량은 1.98(t/㎥)으로 KS F 2534의 경량골재의 절건비중과 단위용적에 따른 분류에 의하면 중위급(medium weight) 경량골재에 속하는 것으로 측정되었다. 또한 잔 골재 중 하수 슬러지 경량 골재를 0%, 5%, 10%, 15%, 20%, 25%, 30%로 치환하여 그때의 압축, 휨, 인장강도를 측정하였다. 그 결과 하수 슬러지의 증가에 따라 강도 감소를 보였으나, 일반 경량콘크리트 제조 또는 단열용 콘크리트 블록 제조에 사용이 가능하다고 사료된다. 그러므로 앞으로 건조수축, 크리이프 특성 및 내구성에 관한 연구가 더욱 심도 있게 이루어져야 폐자원인 하수 슬러지를 이용한 건자재의 개발이 가능하리라 판단된다. In this study, the polymer concrete was produced by using the lightweight aggregate that had been manufactured using the sewage sludge and its physical properties were experimentally examined. Experimental results show that when the portion of sewage sludge lightweight aggregate in the fine aggregate increases, slump values decreases. Also, the compressive, the flexural and the tensile strengths decrease when the portion of sewage sludge lightweight aggregate increases. Although its strengths decreases, the sewage sludge lightweight fine aggregates is thought to be used for construction materials.

기둥 형상에 따른 Wide Beam-기둥 접합부의 이력거동에 관한 연구

윤용대,이우진,서수연,吉村浩二,윤승조 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)

In this paper, the effective width of wide beam with variable column section was investigated experimentally. Three specimens with variable column sections were designed to represent the exterior wide beam-column joint and incremental cyclic loads were acted to the beam. Test result showed that the strength of beam was increased when the section size of column was enlarged. In case of the enlargement of column depth, especially, the strength was maximized. On the comparison of Wight's and Newzealand code formula with test results, it was concluded that these two formula underestimated the effective width of wide beam.

R.C.造에서 超音波速度에 미치는 鐵1筋의 影響 : 길이방향鐵筋을 중심으로 On the longitudinal Steel bar

윤석천,정수영,연길환 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.2

Ultrasonic testing of a reinforced concrete member by means of the ultrasonic testing apparatus is affected by the steel bar embedded in concrete. A test location avoid the zone of steel effect when selecting test location in reinforced concrete member. But if it is impossible, it is necessary to make a correction to the measured value to provide an estimate of the velocity of the pulse in the plain concrete. The purpose of this study is to analyze the effect of steel bar on ultrasonic pulse velocity and the evaluate optimum correction formular by means of comparison between pulse velocity in concrete and effective pulse velocity according to steel bar diameters. Concrete mixes having water cement ratio of 0.4 and 0.6 by weight and slump values of 18㎝ in fresh concrete were used to make 20×30×60㎝ cubes for pulse velocity in concrete and effective pulse velocity. The diameters of the plain bars were 6, 9, 12, 19, 25, 32, 38 and 50㎜.

뇌낭미충증으로 인한 난치성 간질에서 병변 주변의 간질 생성 소견

윤수진,서대원,홍승봉,홍승철,서연림,이광호,이원용,김병준 대한신경과학회 1999 대한신경과학회지 Vol.17 No.5

최근 10년간 원광의대병원에서 시행한 소아 심장혈관 수술의 임상적 고찰

윤향석,정수미,최두영,오광수,오연균,김종덕,양현웅,이삼윤,김형곤,최종범,최순호,노병석 圓光大學校 醫科學硏究所 1995 圓光醫科學 Vol.11 No.2

We reviewed 10 years experiences of the clinical aspects and early postoperative results in 544 pediatric patients(age less than 16 years old). Among them. 529 cases had the congenital heart diseases, and 15 had the acquired diseases. Open heart surgery was performed in 413 patients. 115 cases were treated with non-open heart surgery. 16 with interventional catheterization. Annual increase of the cardiac patients was not significant in recent 10 years, except slight increase in 1994. The mean age of the study patients had been evidently changed to younger year by year. Total mortality rate of the open heart surgery was 6.4%. The cyanotic congenital heart diseases were high in early postoperative mortality by 25.7%, whereas 4% in acyanotic group. The age group less than one month was most highest in surgical mortality(66.7%). There were no deaths in patients with patent ductus arteriosus(103 cases), atrial septal defect(83 cases) or pulmonary stenosis(17 cases). Among 220 patients with ventricular septal defects(VSD). 10(4.5%) were died early postoperatively. In cyanotic group, the patients with pulmonary atresia with ventricular septal defects(PAVSD), transposition of the great arteries(TGA), interrupted aortic arch(IAA), complex cardiac anomalies with isomerism seemed to be most susceptible to an early death.

연부조직 신경주막종 - 1예 보고 -

최윤라,김대수,고재향,서연림 대한병리학회 1998 Journal of Pathology and Translational Medicine Vol.32 No.11

중합효소연쇄반응을 통해 확진되고 Atovaquone과 Azithromycin으로 치료한 Human Babesiosis 1예

윤기태,김연아,구남수,김준형,정세진,김홍정,송경호,최유경,신소연,김영근,김명수,박윤선,최준용,송영구,김준명 대한감염학회 2006 감염과 화학요법 Vol.38 No.5

저자들은 국내에서 처음으로 중합효소연쇄반응 검사를 통하여 B. microti에 의한 인체 바베시오시를 진단하였으며, atovaquone과 azithromycin 병합요법을 사용하여 치유한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Human babesiosis is a tick-borne infectious disease caused by Babesia species. The clinical diagnosis is difficult because of nonspecific symptoms like flu. Rapid diagnosis of human babesiosis is microscopic examination in peripheral blood smear (Giemsa-stain) which reveals characteristic forms of an intracellular quadruplet parasite. But differentiation between Babesia microti and Plasmodium species can be quite difficult because of the morphologic similarity. We experienced a case of human babesiosis. The patient was a 62-year old Korean male who had been in New Jersey, U.S.A for 2 months. We initially diagnosed as malaria infection because the peripheral blood smear revealed intracellular single ring form organism. But the patient was not improved significantly by the treatment with chloroquine regimen. Finally we confirmed human babesiosis by polymerase chain reaction for Babesia microti. We treated the patient successfully with a regimen of atovaquone and azithromycin which has fewer adverse reactions than a regimen of clindamycin and quinine.

난소 및 난소 종양 염전의 초음파 소견

오연희,이현경,이원재,이성우,박수성,윤혜원,임문환,심재철,김용탁,김성숙,김정란 동국대학교 경주대학 1993 東國論集 Vol.12 No.-

Acute torsion of the ovary and ovarian mass is a recognized surgical emergency, but rarely has the diagnosis been made preoperatively on the basis of imaging studies. The sonographic findings in 14 cases of surgically proven torsion of the ovary and ovarian mass are described. Mostly cystic ovarian mass, engorged vessel, dilated uterine tube, beak-like echo(torsion site), smooth mass wall thickening an free-fluid collection in cul-de-sac are described. More significant in terms of specificity were the demonstration in 6 cases(42.9%) of the smooth mass wall thickening and in 8 cases(57.1%) of a free fluid in the cul-de-sac. We report the sonographic findings of ovary and ovarian mass torsion that may suggest the preoperative diagnosis of this condition.

噴霧法에 依한 硫化亞鉛 薄膜의 電場發光 調査

손연규,윤지홍,권태향,한광수,이자현 안동대학교 기초과학연구소 1991 基礎科學 硏究論文集 Vol.2 No.1

The study of Electroluminescence has been begun with that the two Germans, B. Gudden & R. W. Pohl in 1920 examined the remaining lights by dint of adding Electric Field at the fluorescent substance, and from 1952 the study became brisk, in 1960 made a peak, and afterward it was diminished. The above facts were appeared through H. E. Ivey`s investigation. The cause was it that the light-efficiency and the brightness were very pessimistic, though the beginning of EL-Study was given in the development of illumination. In 1950, however, with the initiative that C. W. Jerome of Sylvania Co. deviced and announced EL-Lamp, EL-Fluorescent substances were embed and merchandised as EL-Panels, and after a while it was applied to EL-Lamps, Expression Apparatuses, Light Amplifier, Logic Circuit and so on, with which the use frequency got high, and it has been developed as a promising Electronic Industry. But in our country, considering the various conditions, in order to find out the possibility of EL-Production within the home country, Impurity was introduced to ZnS powder, EL of ZnS : Cu, Cl & ZnS : Cu, Mn, Cl could be manufactured, and surveying the Voltage Characteristics, the Frequency Characteristics, and the Spectral Response of the manufactured things, the fundamental technique-problems about the composition of ZnS powder, the introduction of impurity, the formation of thin-thickness, and the construction of Cell, etc were solved gradually. 1. The quantity of Cu must commonly be more one order than in the use of Photoluminescence, as a whole 10(-3)gm,atm/mole ZnS is fitted, and Mn suitable in about 10 times of Cu. 2. Yellow color must dope Cu as well as Mn, when the quantity of Cu fixed to a certain amount, in case that the quantity of Mn is decreased, it be turned into Yellow color, if it is increased, it be taken Orange color. 3. In vacuum flowing HzS gas and baking at the moment, it is said that EL of which brightness is high, but in the air we can secure ZnS : Cu, Cl EL. only. 4. In referring to the conditions 1, 2, 3, I can infer that EL-manufacture if possible in our country.