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연구보문 : 자연과학 ; 황산처리에 의한 불투수성 황근 종자의 발아촉진에 관한 연구
서상흠 ( Sang Heum Seo ),박민우 ( Min Woo Park ),장미하 ( Mi Ha Chang ),장일웅 ( Il Ung Jang ),심상인 ( Sang In Shim ),나영왕 ( Young Wang Na ),김수영 ( Soo Young Kim ),김석현 ( Seok Hyeon Kim ) 한국국제농업개발학회 2012 韓國國際農業開發學會誌 Vol.24 No.3
The reason of poor germination rate of hamabo mallow seed was speculated using TZ test to determine the viability of seed. Seeds showed high viability via TZ test were not germinated well. The quiescent seeds did not imbibed properly due to the hard seed coat and did not show further processes required for germination. Several well-known treatments for seed coat loosening and water uptake into seed were applied and compared for their efficiency. Stratification, hot water treatment, seed coat scarification, wet-cold treatment were revealed as less effective for improving germination although those treatments were common method for breaking dormant seed. Chemical scarification with sulfuric acid, however, effectively increased germinability and promptness index of hamabo mallow seeds. Optimal time for sulfuric acid treatment was 20 min. Seeds treated for 20 min showed improved germination percentage, germination speed, and promptness index of 80%, 13, and 1969 at 30 days after imbibition, respectively, in petri dish experiment. The values were greater than control seeds showed low values (12%, 1, and 183, respectively). The similar tendency was observed in the pot experiment that sulfuric acid treated seed were sown in artificially mixed soil (loamy soil:peatmoss:sand:compost = 5:2:2:1) and placed in greenhouse. Ultrastructure analysis of chemically scarified seed with sulfuric acid for 20 min by scanning electron microscopy did not show any noticeable changes in seed coat hardness and water uptake via hilum. But the only change after sulfuric acid treatment was removal of hilum cap that close the hilum and hider imbibition. Therefore, subsequent experiment was conducted to know the relationship between removal of hilum cap and facilitated imbibition by sulfuric acid treatment and whether the hilum cap removal directly influenced to the opening of micropyle. Water uptake velocity of seed treated for 20 min in concentrated sulfuric acid for was greater than control seed. This result implies that the crucial effect of sulfuric acid treatment is the removal of hilum cap that increase water uptake via micropyle in hamabo mallow.
Bandom Amplified Polymorphic DNAs 기법을 이용한 Bifidobacteria의 신속한 동정
왕지원,민해기,장영효,강국희 성균관대학교 생명과학자원연구소 1995 生命資源科學硏究 Vol.2 No.1
Random Amplified Polymorphic DNAs (RAPD) has been applied to the identification of human intestinal anaerobic Bifidobacteria. Recently, The RAPD technique has been used to analyse DNA polymorphism of genomic DNA from eukaryotes such as plants and animals(1, 3, 4, 10, 11). But there were only several reports on the polymorphism of prokaryotic genomic DNA by using this method(2,7). Total 100 random sequence primers were used in screening of species-specific primer. The oligonucleotide primers were ten bases long and designed to have average G+C contents of 60 mol %. Eight species of Bifidobacteria from human feces were selected. According to conventional method genornic DNA were extracted from each bifidobacterium and then RAPD-PCR was performed. Four primers have produced distinct electrophoretic band patterns, RAPD markers. Especially arbitrary primer # 101 showed species-specific DNA polymorphism for each of Bifidobacterial genomic DNA tested. The arbitrary primer # 101 showed good reproducibility when the PCR conditions were optimized. And also primer # 156, # 174, # 183, have produced amplified PCR products but not for all of the strains tested. Better DNA polymorphism was observed when two arbitrary primers were used in combination.
AC8A-T6 알루미늄 合金材의 切削加工 特性에 關한 硏究
최현민,김경우,김우순,김용환,김동현,채왕석 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
In this study, examined the cutting characteristics of alumuminum alloy AC8A-T6 that is used to present car piston materials. And in been holding materials machining empirically escape as result that experiment comparison changing the cutting speed and feed on various condition to choose efficient machining condition. The following results can be summarized from this research. 1.As the cutting speed decreased, principal cutting force and thrust cutting force is increased, and reason that cutting force interacts greatly in the low cutting speed is thought by result by BUE's stabilization. 2.The feed speed and cutting speed increase, friction factor is decrescent and the cause appeared the thrust cutting force is fallen than cutting force relatively because chip flow according to increase of the feed rate is constraint. 3.Though specific cutting resistance grows cutting area and the feed rate are few, the cause was expose that shear angle decreases by rake face of tool gets into negative angle remarkably as wear of a cutting tool or defect part of workpiece is cut. 4.Cutting speed do greatly depth of cut is slow, surface roughness examined closely through an experiment that becomes bad, and know that it can get good surface that process cutting speed because do feed rate by 0.1㎜/rev low more than 250m/min to get good surface roughness can.
( Hee Geun Park ),( Deog Jo Jung ),( Jun Hyun Jeong ),( Jong Kui Jun ),( A Ram Yoon ),( Young Ran Lee ),( Kyung Eun Min ),( Myung Hwa Kim ),( Kwang Moo Lee ),( Wang Lok Lee ) 한국운동영양학회 2013 Physical Activity and Nutrition (Phys Act Nutr) Vol.17 No.1
This study investigated the effect of aerobic exercise training on immune cell proliferation and inflammatory cytokine production in the spleen of high fat diet-induced obese mice. C57B1J6 male mice (4 weeks aged. n20) were fed a high fat diet (45% fat) for 5 weeks so that obesity was led intentionally. Then, these obese mice were divided into 2 groups: control group (CON. n10) or exercise group (EXE, n=l0). EXE performed treadmill running for 30-60 min/day at 10-22 m/min, 0% grade, five times per week for 8 weeks. After 13 weeks, all the splenocyte was collected and Con A (Concanvalin A 10 ㎍/ml) was used to stimulate the cell proliferation. MTS and BIOPLEX assay were used for cell proliferation and cytokine production. Independent t-test was used and a p-value under 0.05 was considered as statistically significant. In the results, body weight, IL-2 and IL-6 production were significantly reduced and Splenocyte proliferation was significantly increased after 8 weeks of exercise training. These findings suggest that aerobic exercise training has a positive effect for improving the obese-induced immune dysfunction.
유아의 행동문제와 유아교육기관 적응력, 또래관계, 자아탄력성 및 마음이론 간의 관계분석
조유진(Yu-Jin Cho),김민아(Min-Ah Kim),김성현(Seong-Hyun Kim),김채연(Chay-youn Kim),이영민(Young-Min Lee),김순희(Soon-Hee Kim),김진희(Jin-Hee Kim),김보라(Bo-ra Kim),왕혜원(Hye-Won Wang) 중앙대학교 한국교육문제연구소 2015 한국교육문제연구 Vol.33 No.2
본 연구의 목적은 유아의 행동문제와 유아교육기관 적응력, 또래관계, 자아탄력성, 및 마음이론 간 의 관계를 분석하고 유아의 행동문제에 영향을 미치는 예측변인을 밝히는데 있다. 본 연구의 연구대상 은 유치원에 재원중인 만 5세 유아 153명으로 평균 월령은 66.05개월 이였다. ‘K-CBCL 1.5-5’와 유 아교육기관 적응력 검사도구(PAQ)’, ‘또래관계 검사도구(PIPPS)’, ‘자아탄력성 검사도구(DECA)’, ‘ 마 음이론 검사도구를 사용하여 연구자료를 수집하였으며 수집된 자료는 Pearson 적률상관계수와 단계적 중다회귀를 통해 검증하였다. 연구결과, 유아의 내재화, 외현화 행동문제는 또래관계에 유의미한 정적 상관이 있는 것으로 나타났으며, 자아탄력성, 유아교육기관 적응력, 마음이론에 유의미한 부적상관이 있는 것으로 나타났다. 유아의 내재화 행동문제에 있어서는 유아교육기관 적응력이 유의미한 부적 예 측변인으로 나타났으며, 유아의 외현화 행동문제에 있어서는 자아탄력성, 또래관계, 마음이론이 유의미 한 부적 예측변인으로 나타났다. This study investigated the relationships among young children’s problem behavior and peer relation, ego-resilience, preschool adaptation, theory of mind. Subjects used in this study were 153 young children whose mean age of 66.05 months, and who were attended in eight kindergartens. Research instruments used in collecting data were ‘Child Behavior Check List preschool 1.5-5’, ‘Penn Interactive Peer Play Scale(PIPPS)’, The Devereux Early Childhood Assessment(DECA), ‘The Preschool Adjustment Questionnaire(PAQ)', and lastly, ’Theory of Mind’. The collected data were analyzed through SPSS 18.0 program. Pearson’s correlation and Stepwise Multi-Regression Analysis were used to analyze the data. The results of this study were as follows: First, there were positve correlations between young children’s problem behaviors and peer relationship. Second, there were negative correlations between young children’s problem behaviors and ego-resilience, preschool adaptation and theory of mind. Third, preschool adaptation were found to be predictable variables affecting young children’s internalizing problem behavior and peer relation, ego-resilience, and theory of mind were found to be predictable variables affecting young children’s externalizing problem behavior.
Young Sup Woo,Won-Myong Bahk,Jeong Seok Seo,Young-Min Park,Won Kim,Jong-Hyun Jeong,Se-Hoon Shim,Jung Goo Lee,Seung-Ho Jang,Chan-Mo Yang,Sheng-Min Wang,Myung Hun Jung,Hyung Mo Sung,Il Han Choo,Bo-Hyun 대한정신약물학회 2022 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.20 No.1
The Korean Medication Algorithm Project for Depressive Disorder (KMAP-DD) first was published in 2002, and has been revised four times, in 2006, 2012, 2017, and 2021. In this review, we compared recommendations from the recently revised KMAP-DD 2021 to four global clinical practice guidelines (CPGs) for depression published after 2010. The recommendations from the KMAP-DD 2021 were similar to those from other CPGs, although there were some differences. The KMAP-DD 2021 reflected social culture and the healthcare system in Korea and recent evidence about pharmacotherapy for depression, as did other recently published evidence-based guidelines. Despite some intrinsic limitations as an expert consensus-based guideline, the KMAP-DD 2021 can be helpful for Korean psychiatrists making decisions in clinical settings by complementing previously published evidence-based guidelines, especially for some clinical situations lacking evidence from rigorously designed clinical trials.
Wang, Min,Jang, Sung Kyu,Jang, Won‐,Jun,Kim, Minwoo,Park, Seong‐,Yong,Kim, Sang‐,Woo,Kahng, Se‐,Jong,Choi, Jae‐,Young,Ruoff, Rodney S.,Song, Young Jae,Lee, Sungjoo WILEY‐VCH Verlag 2013 ADVANCED MATERIALS Vol.25 No.19
<P><B>Direct chemical vapor deposition (CVD) growth of single‐layer graphene</B> on CVD‐grown hexagonal boron nitride (h‐BN) film can suggest a large‐scale and high‐quality graphene/h‐BN film hybrid structure with a defect‐free interface. This sequentially grown graphene/h‐BN film shows better electronic properties than that of graphene/SiO<SUB>2</SUB> or graphene transferred on h‐BN film, and suggests a new promising template for graphene device fabrication.</P>
Son, Byung Ho,Dominici, Laura S,Aydogan, Fatih,Shulman, Lawrence N,Ahn, Sei Hyn,Cho, Ja Young,Coopey, Suzanne B,Kim, Sung Bae,Min, H Elise,Valero, Monica,Wang, Jiping,Caragacianu, Diana,Gong, Gyung-yu Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6
Background: Breast cancer diagnosed in young women may be more aggressive, with higher rates of local and distant recurrence compared to the disease in older women. Epidemiologic evidence suggests that Korean women have a lower incidence of breast cancer than women in the United States, but that they present at a younger age than their American counterparts. We sought to compare risk factors and management of young women with breast cancer in Boston, Massachusetts (US) with those in Seoul, South Korea (KR). Materials and Methods: A retrospective review was performed of consecutive patients less than 35 years old with a diagnosis of breast cancer at academic cancer centers in the US and KR from 2000-2005. Patient data were obtained by chart review. Demographic, tumor and treatment characteristics were compared utilizing Pearson's chisquare or Wilcoxon rank-sum tests where appropriate. All differences were assessed as significant at the 0.05 level. Results: 205 patients from the US and 309 from KR were analyzed. Patients in US were more likely to have hormone receptor positive breast cancer, while patients in KR had a higher rate of triple negative lesions. Patients in US had a higher mean body mass index and more often reported use of birth control pills, while those in the KR were less likely to have a sentinel node procedure performed or to receive post mastectomy radiation. Conclusions: Patients under 35 diagnosed with breast cancer in the US and KR differ with respect to demographics, tumor characteristics and management. Although rates of breast conservation and mastectomy were similar, US patients were more likely to receive post mastectomy radiation. The lower use of sentinel node biopsy is explained by the later adoption of the technique in KR. Further evaluation is necessary to evaluate recurrence rates and survival in the setting of differing disease subtypes in these patients.