기후변화협약의 과제와 전망-기후변화협약이 석유산업에 미치는영향

유상희,Yu, Sang-Hui 대한석유협회 1994 석유와 에너지 Vol.1994 No.5

선진국의 환경규제가 무역에 미치는 영향

유상희,Yu, Sang-Hui 대한석유협회 1993 석유와 에너지 Vol.1993 No.7

이 자료는 지난 6월 4일 서울대 호암교수회관에서 열린 자원경제학회 학술대회에서 발표된 내용을 옮긴 것이다. <편집자 주>

공해비용균등화세가 우리나라 무역에 미치는 영향

유상희,Yu, Sang-Hui 한국자원경제학회 1993 資源經濟學會誌 Vol.3 No.1

기후변화협약과 한국산업

유상희,Yu, Sang-Hui 대한석유협회 1994 석유와 에너지 Vol.1994 No.8

이 자료는 지난 6월23일 산업연구원의 정책토론회에서 발표된 내용임. <편집자 주>

유리 섬유의 첨가에 따른 자가중합 및 열중합 의치상용 레진의 강화효과

유상희,김연수,최운재,전종남,Yu, Sang-Hui,Kim, Yeoun-Soo,Choi, Un-Jae,Jun, Jong-Nam 대한치과기공학회 2009 대한치과기공학회지 Vol.31 No.4

This study evaluated the effect of concentration of glass fiber reinforcement on the flexural properties of auto and heat polymerized denture base resin. The test specimens($64{\times}10{\times}3.3mm$) were made of auto and heat polymerized resin(Vertex, Dentimax, Netherlands). Glass fiber(ER 270FW, Hankuk Fiber Glass, Korea) were used to reinforce the denture base resin. The 2.6%, 5.3% and 7.9% volume pre-impregnated fiber were located at the bottom of specimen. The test specimens(n=7) of each group were stored in distilled water at $37^{\circ}C$ for 50 hours before test. The flexural strength and modulus were measured by an universal testing machine(Z020, Zwick, Germany) at a crosshead speed of 5 mm/min in a three-point bending mode. The data was analyzed by one-way ANOVA and the Duncan's multiple range test(${\alpha}$=0.05). The difference of auto polymerized resin groups and heat polymerized resin groups were statistically analyzed by t-test(${\alpha}$=0.05). Glass fiber showed significant reinforcing effects on auto and heat polymerized resin. For flexural strength and modulus, auto polymerized resin was the highest in 7.9% volume, while heat polymerized resin was the highest in 5.3% volume. In this study, glass fiber at 7.9% volume ratio showed most effective reinforcing effect on auto polymerized resin and glass fiber at 5.3% volume ratio showed most effective reinforcing effect on heat polymerized resin in terms of flexural strength and flexural modulus.

탄소세(炭素稅)의 산업부문별(産業部門別) 영향(影響)

유상희,Yu, Sang-Hui 한국자원경제학회 1994 資源經濟學會誌 Vol.4 No.1

지난 3월에 발효된 기후변화협약의 목적은 이산화탄소 등의 온실가스 배출을 억제하여 지구온난화를 방지하자는데 있다. 그런데 이산화탄소의 배출을/억제하기 위해서는 화석연료의 사용을 줄일 수 밖에 없고 나아가서는 경제성장목표를 수정하지 않을 수 없을 것이다. 이산화탄소 배출저감을 위한 여러 정책대안들 중에 탄소세가 가장 효과적이며 시행가능성이 높은 것으로 알려져 있으며 EU를 비롯한 선진국들을 중심으로 범선진국 차원에서 이를 도입하자는 움직임이 있다. 특히 우리나라는 OECD가입을 목전에 두고 있어 다른 선진국들과 마찬가지로 탄소세의 도입을 적극 검토하지 않을 수 없다. 이에 본 고는 원유환산배럴당 10달러의 탄소세를 부과할 때 우리나라 각 산업부문에 미치는 영향을 산업연관모형 및 정태적 무역모형을 이용하여 추정하였다. 그 결과 우리나라 산업전반에 걸쳐 탄소세의 영향이 상당히 크게 나타났으며 특히 시멘트, 철강, 화학 등의 에너지 다소비 업종을 중심으로 심각한 대외경쟁력 약화 및 수출감소가 추정되었다.

망사 형태의 유리섬유 구조와 함량에 따른 유동성 자가중합 의치상용 레진의 강화효과

유상희(Sang-Hui Yu),오승한(Seunghan Oh),배지명(Ji-Myung Bae) 대한치과재료학회 2014 대한치과재료학회지 Vol.41 No.1

The aim of this study was to evaluate the reinforcing effects of glass fiber meshes with different content and structures on auto-polymerized pour-type denture base resin. The reinforcements were two types of glass fiber meshes; SES mesh(SES: SES 1108, INNO Dental Co., Ltd., Korea) and Glass cloth(GC: Glass cloth R 326, Hankuk Fiber Co., Korea). GC groups were prepared in two layers(GC 2), three layers(GC 3), and four layers(GC 4). Auto-polymerized pour-type resin(PRESS LT; retec, Rosbach, Germany) was used as the denture base resin. The specimen(64×10×3.3 mm) was prepared by locating each reinforcement at the tension side of the three-point bending mode. Control group was prepared without any reinforcement. The flexural properties of the specimen were measured by an universal testing machine at a crosshead speed of 5 mm/min. The results were evaluated with 1-way ANOVA, and the Duncans multiple range test(α=0.05). The flexural strength and toughness of all the glass fiber reinforced groups were significantly higher than the control, except GC 2(P<0.05) and GC 3 showed the highest toughness(P<0.05). The flexural moduli of all the glass fiber reinforced groups were significantly higher than the control(P<0.05). SES(4.36 vol%), GC 3(5.34 vol%) and GC 4(7.39 vol%) were effective in reinforcing the flexural properties of the denture base resin and GC 3 was most effective. Content of the glass fiber reinforcement is considered to be a more important factor than the structure.

섬유의 종류와 배열방향에 따른 상악 총의치의 강화효과

유상희(Sang-Hui Yu),박다령(Da-Ryeong Park),오승한(Seung-han Oh),배지명(Ji-Myung Bae) 대한치과재료학회 2012 대한치과재료학회지 Vol.39 No.1

The fracture of denture base resin occurs due to repeated loading caused by masticatory forces or accidental dropping. One method strengthening denture base resin is the addition of reinforcing fibers to resin. The aim of this study was to evaluate the effect of glass and aramid fibers according to the fiber orientation on maxillary complete denture. In the study of denture model, maxillary complete denture was fabricated with auto-polymerized resin(Vertex SC). Glass fiber and polyaromatic polyamide fiber (aramid) were used in unidirectional and bidirectional orientation to reinforce the maxillary complete denture. The maxillary complete denture without fibers was used as a control. The flexural strengths, moduli and toughness of the denture were measured with and without silicone maxillary cast, respectively. The specimens of each group were stored in distilled water at 37℃ for 50 hours before test, The flexural strengths, moduli and toughness were measured with a universal testing machine at a crosshead speed of 5 ㎜/min in a three-point bending mode. For flexural strengths, there were no significant differences according to the fiber type and orientation. The flexural strength of bidirectional glass fiber and unidirectional aramid fiber with silicone cast denture were significantly higher than those without silicone cast denture. However, the flexural modulus of unidirectional aramid fiber was significantly higher than those of other experimental groups and the control at test without silicone cast. The flexural modulus of unidirectional aramid fiber and bidirectional glass fiber without silicone cast denture were significantly higher than those without silicone cast denture. For the toughness, the bidirectional glass fiber with silicone cast were significantly higher than those of other experimental groups and the control, with the exception of unidirectional aramid fiber. The toughness of control, bidirectional glass fiber and unidirectional aramid fiber with silicone cast denture were significantly higher than those without silicone cast denture. In this study, bidirectional glass fiber and unidirectional aramid fiber showed the significant reinforcing effect on maxillary complete denture in terms of flexural modulus and toughness.

원저 : 공중구강보건학 분야 ; 가철성 의치장착 노인의 구강건강관련 삶의 질

유상희 ( Sang Hui Yu ),김영임 ( Young Im Kim ),이흥수 ( Heung Soo Lee ) 대한구강보건학회 2008 大韓口腔保健學會誌 Vol.32 No.4

섬유강화재의 종류와 함량이 교정용 아크릴릭 레진의 굴곡성질에 미치는 영향

유상희(Sang-Hui Yu),오승한(Seunghan Oh),배지명(Ji-Myung Bae) 대한치과재료학회 2012 대한치과재료학회지 Vol.39 No.4

The aim of this study was to evaluate the reinforcing effect of three different fibers according to the fiber concentration on the flexural properties of orthodontic acrylic resin. The auto polymerized orthodontic acrylic resin(Orthocryl<SUP>®</SUP>, Dentaurum Gmbh & Co. KG, Ispringen, Germany) was used in the study. Glass fiber (GL: ER 270FW, Hankuk Fiber Glass, Korea), polyaromatic polyamide fiber (PA: Kevlar-49, Dupont, U.S.A.), and ultra-high molecular weight polyethylene fiber (PE: P.E, Dong Yang Rope, Korea) were added to orthodontic acrylic resin. The 2.6 %, 5.3 %, and 7.9 % volume pre-impregnated fibers placed at the bottom of a specimen mold. The test specimens(n=10) of each group were stored in distilled water at 37 ± 1 ℃ for 50 ± 2 hours before test. The flexural strength and modulus were measured by an universal testing machine(Z020, Zwick, Germany) at a crosshead speed of 5 ㎜/min in a three-point bending mode. The data was analyzed by one-way ANOVA and the Duncan’s multiple range test(α=0.05). In terms of flexural strength and modulus, all of the experimental groups showed significant reinforcing effects compared with the control group(P<0.05), with the exception of the 2.6 % and 5.3 % PE groups. Among all the groups, the flexural strength and modulus of the 7.9 % GL groups were the highest(P<0.05). In the same volume ratio, GL groups showed significantly higher flexural strength and modulus than the PA and PE groups at 7.9 % volume ratio(P<0.05). In the same fiber type, 7.9 % GL and PE groups showed significantly higher flexural strength and modulus than the groups of other volume ratio(P<0.05). However, there was no significant difference between the PA groups of each volume ratio(P>0.05). In this study, glass fiber at 7.9 % volume ratio showed most effective reinforcing effect on the flexural properties of orthodontic acrylic resin.