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이병익,김성헌,이무성,Lee, Byung-Ick,Kim, Sung-Hun,Lee, Moo-Sung 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.5
The composites of poly(l-lactide) (PLLA) and silica were prepared using a Haake melt mixer. In order to improve the interfacial adhesion between the two components silica was modified using three different silane coupling agents with different functional moieties. For the case that silica is treated with GPTS or MPTS, the molecular weight of PLLA are significantly reduced. This results in the lowering of the glass transition temperature ($T_g$) and melt viscosity of the composites. However, when the APTS-treated silica with amine functionality is added to PLLA, the storage modulus and melt viscosity of the composites are somewhat increased compared to neat PLLA. The rate of melt crystallization of PLLA is also increased as a result of surface treatment of silica.
실리카 첨가에 의한 폴리카보네이트 수지의 니스크래치 특성 개선
이병익,임균택,이무성,Lee, Byung-Ick,Lim, Gyun-Taek,Lee, Moo-Sung 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.3
Polycarbonate (PC)/mineral silica composites were prepared by melt-mixing to improve PC's surface characteristics. The silica's surface was modified using a silane coupling agent with amine functional moiety prior to blending. The effects of silica on the PC's morphology, dynamic mechanical properties, molecular weight, and pencil hardness were investigated. Although SEM showed that silane treatment promoted interfacial adhesion between the PC and the silica, the storage modulus of the PC/silica composites increases with increasing silica content irrespective of silane treatment. Silica addition decreased the molecular weight (MW), and thus the melt viscosity of PC in the composites. The reduction was slightly greater at higher silica contents and when silane-treated silica was added. Despite the detrimental effects of silica on the MW, the pencil hardness of the PC increased to F grade when silane-treated silica of 40 phr was added possibly due to the increased modulus and interfacial adhesion.
초등학생의 태권도수련을 통한 자신감이 성격형성에 미치는 영향
이병익(Lee, Byung-Ek),안용철(An, Yong-Chel) 용인대학교 무도연구소 2007 武道硏究所誌 Vol.18 No.1
This study examines the effects of elementary student’s Taekwondo training on confidence and character and defines the effects of confidence gained from Taekwondo training on character formation. The subject of this study is 302 elementary students chosen as stratified cluster random sampling method in Gyeonggi area in 2006. According to the purpose of data analysis, t-test, ANOVA, correlation analysis and multiple regression analysis are done, using SPSS Windows 12.0 version. The results of data analysis are summarized as follows. First, physical confidence, social confidence, and general confidence show partial difference by population statistics features. For physical confidence, male students show higher than female students, first graders higher than second and third graders, and the better academic background and better income of their parents, the higher physical confidence they show. When parents have higher income, students show higher social confidence. Second, male students show positive character building than female students in their character male-oriented & social building. First graders show more positive in active, dominant, and considerate character building than second and third graders. Parent’s academic background did not show statistically significant difference in the whole group. However, when parents have better academic background and higher income, students show more positive character building, and when parents have poorer academic background and lower income, students show more positive in dominant, male-oriented, considerate, and social character building. Third, it shows that confidence obtained from Taekwondo training affects character building. Particularly, physical confidence highly affects active character building and male-oriented character building. Meanwhile, social confidence highly affects dominant, considerate, and social character building.
이병익 ( Byoung Ick Lee ) 대한폐경학회 2007 대한폐경학회지 Vol.13 No.1
Women undergoing stem cell transplantation (SCT) are mostly young and have more than 90% probability of ovarian failure, which is often permanent. A woman`s age, use of radiotherapy, alkylating chemotherapy, and the allogeneic type of transplant are associated with a higher rate of premature ovarian failure (POF) and worse residual ovarian function. POF has serious systemic and psychological effects that may need treatment and should be managed by practitioners trained to treat this particular population of women. Ultrasonographic evidence of ovarian follicles is often associated with a future resumption of cycles, but there are no serum markers to predict the return of ovarian function in these patients. There are no guidelines on how to manage POF induced by myeloablative treatments followed by SCT. Because of the likelihood of the need for long-lasting estrogen plus progestin therapy (EPT) and the increased risk of secondary neoplasia after SCT, the EPT should be as physiological as possible. The cyclical sequential combination of EPT was associated with excellent compliance because of its simple administration and few adverse effects. Such a treatment led to a dramatic improvement in vasomotor, urogenital, and psychological symptoms related to estrogen deficiency. However, in the allogeneic transplantation setting, up to 25% of women may suffer from gynecological chronic graft-versus-host disease (GVHD), which may become apparent as hematocolpometra after introduction of EPT. Thus, accurate pretreatment evaluation and frequent monitoring during treatment are required. Moreover, EPT absorption may be reduced in patients who received allotransplants and have gastrointestinal or skin chronic GVHD.