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CAE 응용설계 기법을 이용한 클램프 척(Clamp chuck)의 금형설계 개선에 관한 연구
신명균,허용정,강성남 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1
사출성형에 관한 연구는 오랜 역사를 가지고 있으며 공정 시뮬레이션을 위한 상용화된 CAE 프로그램을 포함하여 많은 연구가 진행되는 분야중의 하나이다 그러나 다양한 고분자 재료의 성질, 금형의 복잡한 형상 및 성형조건 등의 변화로 인해 금형설계 및 제작 그리고 사출성형시 상당한 어려움을 겪게 된다. 사출성형 공정에서는 금형온도, 플라스틱 재료, 냉각수, 보압과 사출압 등의 여러 가지 공정변수가 있어 현장전문가의 경험에 의해 사출금형의 제작이 이루어지는 경우가 보통이다. 이와 같은 경험에 의한 금형 제작은 상당한 납기지연과 노동집약적인 방식으로 흘러가게 된다. 금형 제작시 가장 고려해야 될 사항 중의 하나는 사출성형품의 수축이다. 사출성형에서 용융수지는 냉각, 고화하면서 수축하는데 성형품 치수를 유지하기 위해서는 수축하는만큼 금형의 치수를 보정하여야 한다. 이 수축률은 사용수지의 종류와 성형품 트기, 살두께 등에 따라 다르다. 또 동일한 수지일 경우에도 성형조건에 따라 변화하고 특히 배향성을 가진 수지는 유동방향에 따라서도 변화가 있다. 즉, 금형의 온도가 높으면 수축률은 증가하고 사출압력이 높으면 감소한다. 또한 살두께가 두껍고 길이가 길 때 수축률은 증가한다. 방향성이 있는 수지는 유동방향에 대하여 직각방향에서 가장 적다. 특히 방향성이 현저한 HDP에서는 유동방향에 따라 수축차가 크므로 성형할 때 변형을 일으키는 경우가 많다. 일반적으로 PE, PP, PA와 같은 결정성 수지는 PS, SAN, ABS 등의 비결정성 수지보다 수축률이 크다. 본 연구에서는 한조산업사에서 제작한 '클램프 척' 금형 제작과정에서 성형품의 수축으로 인한 금형의 치수보정에 있어서의 문제점을 유동해석 전용 CAE 프로그램인 C-mold를 사용하여 해석하고 평가하였다. 그리하여 현장 전문가가 경험적으로 여러 번의 시행착오를 거쳐 완성된 금형을 제작하던 기존의 방법보다 체계적이고 합리적이며 또한 신속하게 문제를 해결함으로써 궁극적으로 금형설계 및 제작 기간을 단축하고자 한다.
오병훈,권준수,남궁기,김승현,지익성,김창윤,하규섭,박원명,김성곤,오강섭,김정범,이수정,정한용,이창욱,박용천,이영문,김세주,이병욱 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.5
Four Years Reports of "Journal of Korean Neuropsychiatric Association" during 2001 to 2005 were evaluated by 18 Editorial Board of Korean Neuropsychiatric Association. We investigated the articles to specific fields and rejection rate etc. by different section chiefs. Although several problems concerning review time duration and rejection guideline issues indicated but generally all reviewer processes proved relatively clear and concise criteria. Through these objective and systematic evaluation Processes, "Journal of Korean Neuropsychiatric Association" will develop a good journal.
Hangoeunbi Kang(Hangoeunbi Kang),Bo-Hyun Yoon(Bo-Hyun Yoon),Won-Myong Bahk(Won-Myong Bahk),Young Sup Woo(Young Sup Woo),Won Kim(Won Kim),Jonghun Lee(Jonghun Lee),InKi Sohn(InKi Sohn),Sung-Yong Park(Su 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.1
Objective: The Functioning Assessment Short Test (FAST) is a relatively specific test for bipolar disorders designed to assess the main functioning problems experienced by patients. This brief instrument includes 24 items assessing impairment or disability in 6 domains of functioning: autonomy, occupational functioning, cognitive functioning, financial issues, interpersonal relationships, and leisure time. It has already been translated into standardized versions in several languages. The aim of this study is to measure the validity and reliability of the Korean version of FAST (K-FAST). Methods: A total of 209 bipolar disorder patients were recruited from 14 centers in Korea. K-FAST, Young Mania Rating Scale (YMRS), Bipolar Depression Rating Scale (BDRS), Global Assessment of Functioning (GAF) and the World Health Organization Quality of Life Assessment Instrument Brief Form (WHOQOL-BREF) were administered, and psychometric analysis of the K-FAST was conducted. Results: The internal consistency (Cronbach’s alpha) of the K-FAST was 0.95. Test-retest reliability analysis showed a strong correlation between the two measures assessed at a 1-week interval (ICC = 0.97; p < 0.001). The K-FAST exhibited significant correlations with GAF (r = −0.771), WHOQOL-BREF (r = −0.326), YMRS (r = 0.509) and BDRS (r = 0.598). A strong negative correlation with GAF pointed to a reasonable degree of concurrent validity. Although the exploratory factor analysis showed four factors, the confirmatory factor analysis of questionnaires had a good fit for a six factors model (CFI = 0.925; TLI = 0.912; RMSEA = 0.078). Conclusion: The K-FAST has good psychometric properties, good internal consistency, and can be applicable and acceptable to the Korean context.
Sohn, Woon Yong,Ishiuchi, Shun-ichi,Miyazaki, Mitsuhiko,Kang, Jeongseok,Lee, Soyoung,Min, Ahreum,Choi, Myong Yong,Kang, Hyuk,Fujii, Masaaki The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.3
<P>Electronic and vibrational spectra of acetaminophen were measured by using UV-UV hole burning (HB) and IR dip spectroscopy. HB spectra show the coexistence of 4 different species, which include two new ones. Low-frequency transitions in the spectra are reproduced by a one-dimensional periodic potential with a free-rotor basis set for the methyl group. From the analysis, we concluded that acetaminophen has two conformers and each conformer gives two independent transitions starting from the most stable 0a<SUB>1</SUB> and the hot 1e internal rotational levels. It is also found that the HB spectrum of the <I>trans</I>-conformer in the previous report is that from the 1e excited level, while the HB spectrum of the <I>cis</I>-conformer is contaminated by the transitions of the <I>trans</I>-conformer. Potential curves of the methyl rotational motion are determined both in S<SUB>0</SUB> and S<SUB>1</SUB>.</P> <P>Graphic Abstract</P><P>Four species of acetaminophen were found and assigned to two isomers with methyl internal rotations. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp43552g'> </P>
Sang Ik Han,Suk Bok Bae,Tae Joung Ha,Myong Hee Lee,Ki Chang Jang,Woo Duck Seo,Geum Yong Park,Hang Won Kang 한국육종학회 2011 한국육종학회지 Vol.43 No.2
The groundnut or cultivated peanut (Arachis hypogaea L.) in Korea consists of 36 domestic varieties which have been developed and registered as cultivars for the public during last 25 years. To screen and identify of Korean peanut varieties and genetic resources, we present a simple and reliable method. A methodology based on simple sequence repeat (SSR) markers developed and widely used for prominent gene identification and variety discrimination. For identification of those 36 Korean peanut varieties, 238 unique peanut SSR markers were selected from some previously reported results, synthesized and used for polymerase chain reaction (PCR). Data were taken through acryl amide gel electrophoresis and changed into proper formats for application of data mining analysis using Biomine (all-in-one functional genomics data mining program). Consequently, twelve SSR primers were investigated and revealed the differences between those 36 varieties. These primer pairs amplified 27 alleles with an average of 2.3 allele per primer pair. In addition, those results showed genetic relationship by classification method within 36 varieties. The approach described here could be applied to monitoring of our varieties and adapting to peanut breeding program.
지방섭취량의 차이가 운동선수의 혈액성분변화에 미치는 영향
강명신,홍경란,유병렬,최용어,김근우 韓國體育大學校附屬 體育科學硏究所 1990 韓國體育大學校附屬 體育科學硏究所論文集 Vol.9 No.1
The purpose of this study was to investigate effects of different fat contents of diets (15% of total energy and 30% of total energy), which had been supplied to the two groups of cycling subjects for 16 days, on their blood components. During intakes of the experimental fat diet, the subjects had poacticed their fixed and consistent training every day. The blood samples were collected five times from each subject's ante-cubital vein at rest, after 30 min(during exercise), after 60min (during exercise), after 90 min (during exercise), and after 120 min (during exercise). The statistically analyzed results of hematological and biochemical components related to pre- and post- experomental diet intakes and pre- and post- training were summarized as follows: 1. Each of caloric expenditure from two groups with 15% and 30% fat diets demonstrated 3288±177.0kcal and 3563.0±130.0kcal. Each of protein expenditure from two groups(15% and 30%) showed 172.3±22.9g and 179.5±17.1g. Each of fat expenditure from two groups(15% and 30%) illustrated 64.8±9.9g and 120.0±10.5g. Each of carbohydrate expenditure from two groups (15% and 30%) showed 489.3±57.7g and 460.7±44.1g. 2. Both groups who had consistently exercised increased in their weights approximately by 800g after they had been ingested with 15% fat and 30% fat diets for 15 days. 3. Both groups showed the same values(scores) of hematological and biochemical blood components and total fatty acid composition in plasma lipids before and experimental diets (15% of total energy and 30% of total energy) and training for 15 days. 4. The values of RBC, WBC and Hb in the group of 15% fat diet revealed statistically higher increases than those of them in the group of 30% fat diet during exercise (cycling) (P < 0.05). But in process of exercised values of RBC, WBC, Hb and MCV. 5. The values of NEFA in the group of 30% of fat diet were statistically higher than those in the group of 15% fat diet during during exercise (P < 0.05). But in theprocess of exercise time, two groups revealed significantly different values of TG, NEFA, TC, HDL-C.
In vitro Callus formation and Plant Regeneration of Epimedium koreanum Nakai
Chang-Yeon Yu,Na-Young Kim,Won-Hee Kang,Myong-Jo Kim,Kwon Heo,Won-Cheol Choi,Hyeon-Yong Lee 韓國藥用作物學會 2002 韓國藥用作物學會誌 Vol.10 No.4
The efficiency of regeneration of callus and explants from leaf and stem disks of Epimedium koreanum was examined on the MS media containing 2,4-D, NAA, Kinetin, BA and TDZ. Calli were formed on the 2mg/l 2,4-D media at the rate of 32% from leaf discs and 52% from stems. No callus was produced on the media which are containing BA or TDZ alone. The combination of 2,4-D and BA showed the effect on the formation of callus. The combination of 2mg/l 2,4-D and 0.lmg/l BA in the MS media had produced the highest percentage of callus formation, 50% from leaf discs and 40% from stems, respectively. The combination of 2mg/l 2,4-D and 1mg/1 BA in the MS media had affected the formation of callus in the rate of 40% from leaf discs and 25% from stems. The combined plant growth regulators of 2,4-D and BA increased the formation of calli from leaf discs, but single treatment of 2,4-D showed the highest callus formation from stems. Multiple shoots from leaf discs were formed on the media containing NAA, BA, kinetin, and TDZ. The highest number of multiple shoots were obtained 0.1mg/l NAA combined with 1mg/l kinetin. As a result, leaf discs or stems can be used for the mass propagation of Epimedium koreanum, but stem elongation of shoots from calli was not easy.