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로타 초음파 검사에서의 초음파 평가 결함크기와 실결함 크기와의 관계
성운학,김정태,박윤식 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1
In order to evaluate the reliability of rotor forgings, it is very important to know the actual size of the defects in the rotor forgings. The determination of the defect size requires the accurate non-destructivc measurement. However, there may be some differences between the reported size with the ultrasonic non-destructive testing method and the actual size of defects. These differences may be a severe cause of errors in evaluation of rotor forgings. So, the calculated size with "Master Curve" considering safety factor, which is usually larger than the reported size, has been used in evaluation of rotor forgings. The relation between EFBH (Equivalent Flat Bottom Hole) size measured by non-destructive method and the actual size by destructive method in many rotors manufactured at Doosan was investigated. In this investigation, "Master Curve" compensating the differences between UT reported size and actual size of defects in our rotor forgings was obtainable. The applicability of this "Master Curve" as a way of calculating the actual defect sizc was also investigated. For the evaluation of rotor forgings, it is experted that this "Master Curve" may be used to determine the accurate actual size of defects.
Virtual FRF를 이용한 채터강성 해석에 관한 연구
김성운,정낙신,이강재,양민양 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
The prediction of chatter stable region is a significant requirement for the manufacturing industry. Usually, the chatter stability lobes are obtained by measuring the frequency response function(FRF) of a machining center using impulse test or exciter test. However, these tests are not only spent much time, but also performed after machining center is manufactured. This paper presents virtual FRF using by F.E.M for the prediction of chatter stable region. The proposed method enables a designer to estimate the chatter resistance of machine tools at the early stage of design.
모형 수평 축열조의 열원 유입구 형상에 관한 실험적 연구
박이동,정운철,안성호 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.2
The flow around a heat source rises through an inlet port of heat source and transports the thermal energy from heat source to storage water. The improvement of the geomtry of inlet port of heat source is able to enhance the thermal efficiency of horizontal storage tank and the rapidity of supplying thermal storage energy from heat source to load. In this experimental study, there are six kinds of thermal storage tank which have the different geometry of inlet port of heat source each other. This study is for choosing the tank which has the best thermal efficiency and the most rapid thermal flow in the same experimental conditions. Results have been obtained through this study as the following. Integrated tank system, specially round type, in this case, heat source is directly interposioned in the inlet port of heat source-the geometry of inlet port heat source-has the best thermal efficiency and the most rapid thermal flow. Therefore integrated tank system, specially round type, is suitable to store the sensible heat from the heat source efficiency and to supply thermal energy to load rapidly.
오감각적 자극과 감성 브랜드 프로모션 공간 연출 디자인에 관한 연구 -마임 건강식품 알로주스 프로모션 연출을 중심으로-
김은애,김예은,정채림,진산,이진민,장미정,이성애 숙명여자대학교 산업디자인연구소 2017 숙명디자인학 연구 Vol.24 No.-
본 연구는 최근 감성중심의 디자인 환경에서 화두되고 있는 ‘오감’을 활용하여 브랜드 프로모션 공간을 연출하는 일련의 프로세스를 제안하는데 목적이 있다. 본 연구 범위는 2017년 3월~6월 15주간 숙명여대 환경디자인학과 <융합연출디자인> 수업에서 진행된 수업의 결과물로서 4개 팀 중 1개 팀의 작업물이다. 연구방법은 오감에 대한 문헌 연구와 융합연출 디자인 조사 정리한 사례 연구로 한다. 그 결과 본 연구는 산업체 <마임>과 연계하여 오감을 융합하는 쇼케이스 프로젝트부터 실제 브랜드 프로모션 공간 연출에 이르기까지 건강식품에 대한 브랜드의 일관성과 감성, 스토리성을 제시하였다. 끝으로 본 연구는 오감 을 활용한 공간 연출 디자인으로, 브랜드와 실질적으로 융합하여 브랜드를 프로모션함에 있어서 감성적인 접근방안을 제시 한 것에 의의가 있다. 또한 향후 본 연구는 이와 관련된 공감각, 오감을 담은 브랜드커뮤니케이션 디자인과 브랜드이미지, 브랜드 공간 연출개발에 있어서 기초 자료로 활용될 것으로 기대된다.
Highly Thermal Conductive Alumina Plate/Epoxy Composite for Electronic Packaging
Jeong, Un Seong,Lee, Yoon Joo,Shin, Dong Geun,Lim, Hyung Mi,Mun, So Youn,Kwon, Woo Teck,Kim, Soo Ryong,Kim, Young Hee,Shim, Kwang Bo The Korean Institute of Electrical and Electronic 2015 Transactions on Electrical and Electronic Material Vol.16 No.6
In this study, alumina plates 9~25 μm in size were used as thermal fillers, and epoxy resin was used as a polymer matrix. Oriented alumina plate/epoxy composites were prepared using a rolling method. The effect of ordering alumina plates increased with alumina plate size. The thermal conductivity and flexural strength of the composites were investigated. The horizontal thermal conductivity of the oriented composite was significantly higher than the vertical thermal conductivity. The horizontal thermal conductivity of the 75 wt% alumina content was 8.78 W/mk, although the vertical thermal conductivity was 1.04 W/mk. Ordering of the alumina plate using a rolling method significantly improved the thermal conductivity in the horizontal direction. The flexural strengths of the ordered alumina/epoxy composites prepared at different curing temperatures were measured.
결명자 첨가식이가 흰쥐의 체내 카드뮴 축적에 미치는 영향
김성조,백승화,허종욱,김운성,이주돈,강경원,박성혜,한종현,정성윤,이승현 동아시아식생활학회 2002 東아시아食生活學會誌 Vol.12 No.6
The purpose of this study is to investigate the effect of raw Cassia tora L. powder added-diets on reducing cadmium accumulation in rats. The experimental animals were Sprague-Dawley family(♂ , 4 weeks) which was classified into normal group CN, compared group CS, Cd-added group C1 and groups C2, C3. C4 in which 0.5, 1.0 and 1.5% of the Cassia tora L. powder are added, respectively. The growth rate and food efficiency ratio, and the amounts of accumulated cadmium in rats for 8 weeks were measured and analyzed. The results are as follows; 1. The rates of weight gain decreased in the order of C3>C2>C4>Cn>Cs>C1 groups, and C1 group to which only cadmium water had been fed was the lowest among them. The correlation between groups C1 and C3 was significantly different at the 1% level. 2. Food efficiency ratio(FER) decreased in the order of C3>C2>Cs>Cn>C4>C1, and the FERs of C3, C2, CS, CN and C4 are greater than that of C1 by 22.87, 19.89, 18.54, 14.20 and 13.17%, respectively. 3. As fix the Cassia tora L. powder-added groups, the amounts of cadmium accumulated in organs and tissues that is, the brain, heart, spleen, liver, lungs, testicles, kidney, femoral muscle and leg bones were 0.45±0.04 to 0.83±.04, 1.68±0.02 to 2.16±0.02, 3.26±0.05 to 4.62±0.27, 37.82±0.09 to 47.71±0.73, 1.07±0.10 to 1.66±0.04, 1.04±0.06 to 1.24±0.08, 36.79±0.20 to 39.61±0.53, 0.87±0.02 to 1.00±0.02 and 0.65±0.17 to 1.27±0.06 ㎍/g respectively. 4. The accumulated Cd content for C4 was the lowest among Cassia tora L. powder-added groups. When the results for C4 are compared with those for C1, it is observed that each cadmium content accumulated in the brain, heart, spleen, liver, lungs, testicles, kidney, femoral muscle and leg bones is dropped by 49.03, 22.56, 36.02, 35.75, 41.75, 36.20, 37.00, 22.77 and 56.67%, respectively. On the other hand, the accumulated Cd content increased in the order of brain <leg bones <femoral muscle <testicles <lungs <heart <spleen <kidney <liver. 5. The average Cd accumulation rate in organs and tissues relative to the total Cd intake was 7.14% for C1, while they are 4.91, 4.81 and 4.509a for Cassia tora L. powder-added groups C2, C3 and C4, respectively. 6. The Cd content accumulated in the hair for C1 was the highest, and those for Cassia tora L. powder-added groups gradually increased until 6 weeks and decreased after that. 7. The Cd content accumulated in the feces for C4 was the highest, and those for the groups other than C3 and C4 gradually decreased until 6 weeks and increased after that.