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저밀도 폴리에틸렌의 표면개질과 이를 이용한 저밀도 폴리에틸렌 / 알루미늄 라미네이트의 접착특성
정배영(B . Y . Jung),류승훈(S . H . Ryu) 한국고무학회 2001 엘라스토머 및 콤포지트 Vol.36 No.3
N/A Ultraviolet photografting of acrylic acid onto low density polyethylene was characterized using XPS and contact angle measurement. Effects of surface modification of LDPE and aluminum on LDPE/Al laminate were also investigated. Contact angle decreased significantly at initial state and tends to level off with increasing UV irradiation time. The improvement of hydrophilicity was due to the presence of acrylic acid on LDPE surface. Graft of acrylic acid onto LDPE was also identified from Ols/Cls ratios in XPS spectrum. Adhesion strength of LDPE-g-AAc/Al laminate showed about 30 times higher than LDPE/Al system and it could be attributed to the increase of polarity of LDPE surface. Chemical treatment of Al surface using sulfuric acid/sodium dichromate also increased the adhesion strength of LDPE/Al laminate. Adhesion strength of LDPE/Al laminate decreased significantly under acetic acid.
배영일(Young-Il Bae),이주원(Ju-Won Lee),하태정(Tae Jung Ha),황승하(Seung-Ha Hwang),신창식(Chang-Sik Shin),정창호(Chang-Ho Jeong),김일훈(Il-Hun Kim),심기환(Ki-Hwan Shim) 한국식품영양과학회 2013 한국식품영양과학회지 Vol.42 No.3
메타세콰이어 나무 열매와 잎을 기능성식품 소재로 활용하기 위한 기초자료를 제공하기 위하여 화학성분 및 항산화활성을 조사하였다. 열매와 잎의 가용성 무질소물의 함량은 각각 69.04% 및 50.47%로 나타났으며, 열매의 총 페놀성 화합물 함량은 19.95 mg/GAE g이었고, 잎의 총 페놀성 화합물의 함량은 21.75 mg/GAE g으로 열매보다 잎에서 높은 함량을 보였다. 열매와 잎에 많이 함유되어 있는 무기성분으로는 Ca(2,136.08와 304.85 mg/100 g), K(1,355.53와 1,144.04mg/100 g) 및 P(426.30와 350.50 mg/100 g)이었다. 아미노산은 aspartic acid, glutamic acid 및 proline이 상대적으로 높았으며, 필수아미노산 중에서는 leucine이 상대적으로 높은 비율을 보였고, methionine과 cystine은 낮은 함량을 보였다. 메타세콰이어 열매와 잎의 열수 추출물을 이용하여 라디칼 소거활성 및 환원력을 조사한 결과 농도 의존적인 경향을 보였으며, 특히 잎 열수 추출물에서 높은 항산화 활성을 보였다. 따라서 메타세콰이어나무 잎의 폴리페놀성 화합물은 천연항산화제와 같은 기능성식품 소재로 활용가능성이 매우 높을 것으로 생각된다. The nutrients and antioxidative activities of fruits and leaves from Metasequoia glyptostroboides were investigated to provide basic data for the future development of functional foods. The nitrogen-free extract contents of fruit and leaves were 69.04% and 50.47%, respectively. Total phenolic content was higher in leaves (21.75mg/GAE g) compared to the fruit (19.95 mg/GAE g). The mineral components of fruit and leaves mainly consisted of calcium (2,136.08 and 304.85 mg/100 g, respectively), potassium (1,355.53 and 1,144.04 mg/100 g, respectively), and phosphorous (426.30 and 350.50 mg/100 g, respectively). In terms of amino acid composition, aspartic acid, glutamic acid, proline, and leucine were relatively high, but methionine and cystine were low. The hot water extract from leaves was a more potent free radical-scavenger and had higher reducing activities than extracts from fruit. Thus, phenolics of M. glyptostroboides leaves can be utilized as an effective functional food substance for its natural antioxidant properties.
차량용 에어컨 필터하우징 제작을 위한 냉간단조 공정 유한요소해석
민규영(Min, Kyu-Young),정배영(Jung, Bae-Young),박성영(Park, Sung-Young),박용복(Park, Yong-Bok) 한국산학기술학회 2009 한국산학기술학회 학술대회 Vol.- No.-
본 논문에서는 자동차 공조부품인 리시버드라이어로서 플랜지와 바디로 구성되어 있다. 리시버드라이어는 냉매 중 포함된 습기 및 기타 불순물을 차단하는 부품으로서 사이트글라스가 부착되어 냉매의흐름의 상태를 알 수 있다. 또한 압력 밸브가 부착되어 있어 냉매 회로의 압력과 온도가 상승하면 녹아서 냉매를 배출하므로 배관이나 부품들의 압력에 의해서 파괴되는 것을 방지 할 수 있다. 최근 경제적 성형에 관심이 많아 대표적 성형공정인 냉간단조를 적용하여 소재 회수율 및 절삭 비용 등을 절감하는데 목적을 두었다. 냉간단조를 적용하여 자동차 공조 부품인 플랜지와 바디를 개발하는데 공정설계, 금형설계, 금형제작 기술을 확보하였다.
자가 이식편에 의한 전방십자인대 재건술의 실패요인 : 침해(Impingement)에 대하여 About Impingement
배영재,정영복,태석기 대한슬관절학회 1995 대한슬관절학회지 Vol.7 No.2
The aim of this study was to investigate the influnce of impingement of the geaft by intercondylar roof to stability of the joint and clinical result after reconstruction of anterior cruciate ligament(ACL) with bone-patellar tendon-bone graft. Among 74 cases of ACL reconstruction were done by one tunnel arthroscopic technique from May l991 to February 1994,30 casas with excellent result and 4 cases with poor result were analysed by radiological measurements & stability assessed hy Lachiman test and KT-1000 arthrometer, OAK(Orthopadische Arbeitsgruppe Knie) knee score. Impingement was assessed by relationship between the locations of intersection points on tibial tunnel plateau rnade by the lines drawn along the tibial tunnel and the slope of femoral inteizondylar roof in full extension lateral roentgenogram. Impingement was defined as severe(group 1) which the line of tibial tunnel was in front of the line of intercondylar slope; moderate or non when the former was at the same point or behined the latter(group II). In addition to that, the degree of impingement was evaluated by dividing the distance between the intersection point of intercondylar slope line an anterior margin of tibial tunnel by the width of tibial tunnel, and expressed in terms of percentage. The were as follows; 1. There were 2 cases of group I(severe impingernent) and 32 cases of group II (moderate or no impingement) 2. Regarding the range of motion, one case of group I showed limitation of extension under l0 degrees, and one case of group II showed limitation of flexion under 15 degrees. 3. Lachman test was positive in one case of group I and 3 cases of group II, and negative in one case of y oup I illld 29 cases of group II. 4. Maximal manual displacement measured by KT-1000 arthrometer was 4.81.0 in group I and 1.0+- l.7 in group II(statistically significant difference al p&.00]). 5. The degree of impingement obtained by radiological measurement was 123% in group I and 34% in group lI(statistically significant difference at p=0.001). 6. Accarding to OAK criteria, one cases of group I and 29 cases group II showed excellent result, one case of group I and 3 cases of group II showed poor result. From above results, the presence and degree of impingement assessed by full extension lateral roentgewgram seems to have influence on the stability and clinical result after reconstruction of ACL by one tunnel arthrosccpic technique.
정배영,부기원 江原大學校附設體育科學硏究所 2004 江原大學校附設體育科學硏究所論文集 Vol.- No.27
This study aims to analyze team preference types according to various variables in game activity situations in elementary school class. It is possible to identify students' participation level in game activities in class by examining team preference types indicated in forming teams with the variables of gender differences, of the time of measurement - in the beginning and at the end of a school term, and of team formation of the same-sex members and mixed-sex members. And then this study addresses individual characteristics of students and locates the students alienated from activities in order to create environments that can make all students enjoy class. To serve this purpose, 41 students (23 male and 18 female students) from 2nd class of Year 4 at Nara Elementary School(Alias) in Chuncheon were chosen for the subjects of this study. This study addressed a series of physical training classes conducted by a physical education teacher by observing them, and another series of physical training classes conducted by the researcher herself. The data were collected by resorting to participatory observation, descriptive observation, in-depth interviews and a survey. The data collected were analyzed by means of constant comparative method, examination by member, diversified analytical method, and agreement by colleagues. The results drawn from the above processes are as follows: First, team preference types by gender difference indicated that male students preferred 'victory pursuing style' and 'activity pursuing style', while female students went for 'close friends prefering style'. Second, team preference types in the beginning and at the end of a school term revealed that students preferred 'indifferent style' and 'activity pursuing style' in the beginning of a term, while they preferred 'victory pursuing style' at the end of the term. Third, team preference types in team formation of the same-sex members and mixed-sex members shoed that in the teams with the same-sex members, the styles of 'victory pursuing style', activity pursuing style' and 'close friends preferring style' were evenly distributed, whereas in the teams with mixed-sex groups a lot more students preferred 'victory pursuing style'.