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Sn- Bronze 계 마찰재료의 소결중 미세조직의 변화
김주완,송영두,강복석,강수석,강석중 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.2
The microstrure evolution of a 78.0 Cu-7.1 Sn-12.5 Fe-2.4 Pb(wt%) alloy, metal composition of a typical Cu-Sn base friction material, has been studied during pressure (1.5 Mpa) and pressureless sintering up to 810℃ for various times. Overall microstructural changes during sintering were found to be determined by the reaction between Cu and Sn. The Sn melts upon heating spread alone the capillaries leaving pores at their sites and form ε phase. The pores collapsed during subsequent pressure sintering at higher temperatures. Upon heating ε phase appeared to transform into γ and β phases, which remelted eventually by reverse peritectic reactions. Fores, however, formed again at the sites of the intermediate phases, when the sintering pressure was relieved in the temperature range of peritectic reactions. Remelting of the intermediate phases could thus enlarge the size of pores in Cu-Sn base materials. A good homogeneous microstructure was obtained after sintering at 810℃ for about 1 hr under 1.5 Mpa.
반사판의 표면거칠기와 구조의 오정렬에 의한 파라볼라 반사판 안테나 패턴 일그러짐 계산
김주완,김병성,남상욱,이충웅 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.1
For a parabolic reflector antenna, a simple method is presented for computing efficiently the average power pattern degradations caused by the surface roughness of the reflector and misalignments between the reflector and the feed. In this procedure, both nonuniform surface errors and nonuniform illuminations are employed. The assumptions to derive the expressions are that in each annular region of the antenna, the rms value of the surface roughness is known, and in a zone in a annular region, the phase error by misalignments is constant, and can be taken to its value at the center of the zone. Detailed parametric studies are performed with derived expressions to determine the effects of those errors and illumination tapers on parameters such as gain and sidelobe levels.
순환학습 모형에 따라 블록을 이용한 밀도 개념 학습의 효과
김주완,박윤배 慶北大學校 師範大學 科學敎育硏究所 2001 科學敎育硏究誌 Vol.25 No.-
The purpose of this study is to examine the effect of density concept learning using block according to Learning Cycle model. The Learning Cycle model has 3 stages, that is exploration, concept introduction and concept application. A total of 39 seventh graders were involved in this study. 18 blocks originally developed by Kohn(1993) were made by specified density although they have various mass and volume. Experimental group were given treatment instruction using the block and Learning Cycle model, while control group were given traditional instruction. After the treatment instruction, there was no significant difference of students' achievement between experimental and control group. Experimental group students felt the Learning Cycle instruction more difficult than control group students did. Students showing active attitude toward instruction have higher achievement score than students showing not active attitude.
김주완 대한영상의학회 1969 대한영상의학회지 Vol.5 No.1
1) Radiological evaluation of the lung volumes in Korean athletes to Mexico Olympic games was carried out and following results are obtained. 2) Mean lung volumes of the athletes in male is 6305.00$\pm$123.23ml in female. 3) Comparing with the healthy Korean adults, 20-25 years of ae group, 1392.41ml of larger mean lung volumes in male athletes and 1720.96ml in female are seen 4) Greater lung volumes are obtained in athletes as compared to the same height, weight and body surface area group of non-athletes. 5) Increas ein lung volume is closely related with the increase of height. Largest volume is observed inbasket ball players.
김주완,최환영,승익상 대한마취과학회 1992 Korean Journal of Anesthesiology Vol.25 No.3
Emergency surgical patients are more frequently critical to anesthesia and surgery more than elective cases. They are not ready to anesthesia and surgery, because they have not enough time for physical and laboratory examinations. In addition, they are usually exposed to operative situations to anesthetists and/or surgeons who made little assessments ofpatient's pathological and physical conditions. The goal of preoperative preparation is to assess the degree and process of disease with physiological changes and to improve them before surgery as possible and to get the better outcome of anesthsia and surgery. The outcome of emergency operation influenced by good or poor physiological states and many factors, that is, preanesthetic assessment, laboratory examination, operation time(day-time or night), operative personnel(professor or trainee) and coorperating system in operating theater. We analized 1406(male 704, female 702) emergency surgical patients from March 1990 to February 1991 in order to find out any problems in procedures of emergency anesthesia and/or surgical patients. The results were as follows. 1) The rate of emergency operation was over-all 19.1 percent. There was no sexual difference in number of patients and third and fourth decade of age group were highest candidates for emergency operation(52.9%). 2) Emergency patients were prevalent in obstetic(28.6) and general surgery department(25.2%) and acute appendicitis was most common emergency disease in both sex, if excluding Cesarean section. 3) Over-all rate of Cesarean section was 33.9%, of which 54.4% were managed in emergency situation. 4) Physical status by ASA classification was mainly in 1E and 2E status(72.7%). 5) Almost of cases(87.7%) were operated under endotracheal inhalational anesthesia and enflurane was mainly administered for them as inhalation anesthetics(84.4%). 6) Anesthesia was started in day-time(47.2) and in exra-day time(52.8%). With above results, we recognized that these emergency cases resulted in good outcomes because they were in mostly good physical status(1E and 2E), relatively healthy adults, and noncomplicated disease process. However we hope that anesthesiologists as well surgeons should always be careful to check and manage emergency operating patients in the perioperative period.