레진코팅된 상아질 표면과 레진인레이간 결합에 임시가봉재가 미치는 영향

김태균,이광원,유미경 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.6

이 연구의 목적은 레진 코팅된 표면과 레진인레이 사이의 자가-접착 레진시멘트를 이용한 결합 시 임시가봉제에 따른 미세인장결합강도를 평가하는 것이었다. Caviton(GC, Tokyo, Japan), Provifil(Promedica, Neumunster, Germany), Provifil(Promedica, Neumunster Germany) & petrolatum, and Eugenol-based cement, Tembond(Kerr, Orange. CA, USA) 이 임시가봉재로 사용되었다. Tescera(Bisco, Schamburg IL, USA) 로 제작하였고 자가-접착 레진시멘트인 Rely X unicem (3M, St. Paul. Minn, USA)를 이용하여 접착하였다. 이후 미세인장결합강도를 측정하였고 one-way anova와 Duncan test를 이용하여 분석하였다.(p<0.05) Caviton 군이 다른 그룹과 비교하여 유의성 있는 차이를 보여주었다(p<0.05). Provifil, Provifil & petrolatum, Tembond 군 등은 상대적으로 낮은 간을 보여주었다. The purpose of this research was to compare the microtensile bond strength of resin coated surface and resin inlay according temporary filling materials prior to applying self-adhesive resin cement. Caviton(GC, Japan), Provifi(Promedica, Neumunster, Germany), Provifi(Promedica, Neumunster, Germany) & Petrolatum, and Eugenol-based cement, Tembond(Kerr, Orange CA, USA) were used as temporary filling materials. After fabrication of Tescera(Bisco, Schamburg IL, USA), it was bonded with a self-adhesive resin cement, Rely X unicem(3M, St. Paul. Minn, USA). After this procedure, the microtensile bond strength was measured and it was analyzed through one-way ANOVA and Duncan test(p<0.05). Caviton(GC, Tokyo, Japan) showed statistical difference except for the control(group Ⅰ) and the saliva(group Ⅱ)(p<0.05). Provifil (group Ⅳ), Provifil & petroneum (group Ⅴ), Tembond(group Ⅵ) had lower microtensile bond strength.

중국인을 위한 한국어 교육 연구 : 문법교육을 중심으로

장광군 慶北大學校 退溪硏究所 2004 退溪學과 韓國文化 Vol.- No.35-1

중국학생을 위한 한국어 문법교육을 잘 하려면 '한국어'와 '문법', 그리고 '문법교육'과 관련된 문제를 똑똑히 할 필요가 있다. 왜냐하면 지금 중국학생을 위한 한국어 문법교육에 나타난 문제점이 거의 다 이러한 문제들을 정확히 인식하지 못한 데서 비롯된 것이며 그것에 대한 효과적 진단이 이러한 문제를 정확히 인식한 기초에서만 가능하기 때문이다. 문법교육에 존재한 문제를 종합해보면 첫째, 제1한국어와 제2한국어의 차이를 충분히 인식하지 못하고, 둘째, 학문문법과 실용문법을 잘 구별하지 못하며, 셋째, 해석문법에 치중하고 표현문법을 도외시 한다는 것이다. 이러한 문제점을 해결하기 위해서는 '한국어문법' 수업이 따로 필요하며 정독과 수업과 마찬가지로 2년반 내지 3년 동안 이뤄지는 것이 좋다. 또한 '정독과'에서의 문법수업은 본문강의와 결합시켜서 하는 방식과 먼저 새 문법에 대한 강의와 연습을 하고 그 다음 본문강의에 들어가는 방식의 두 가지가 있다. 문법교육의 실시방법은 중국학생의 난점, 표현문법의 중요성 등에 대한 종합적 분석의 기초에서 표현문법을 창립하고 문법교육에 구문환경해석식 강의법을 도입할 것을 제기한다. 문법학의 한 갈래인 표현문법은 내용, 즉 의미로부터 출발하여 표현형식을 찾는 것이다. 그리고 이 표현형식을 확립하는 데는 집합적 제약을 받기도 하고 통합적 제약을 받기도 한다. 한국어표현문법의 체계확립과 구문환경해석식 강의법은 아직 많은 연구가 필요한 과제이며 기초적인 이론설명과 구체적인 실례분석 역시 그 연구를 위해 마련되어야 할 점들이다. The present Korean Language Education needs to be examined in the grammatical approaches in order to provide Chinese students with the better education. I found that they suffered from misunderstanding the Korean grammar; they easily fail to discern the first and the second developed Korean, and are not accustomed to telling the practical usages from the pedantic expression. It is because they focused more on reading than expressing. Therefore, the language courses should include the independent unit of grammar classes, and let students compose new sentences of their own, applying the basic grammar. As a result, the students would come up with the forms imbeded in the sentences.

두가지 동기방식을 이용한 카오스 주파수천이 변조회로의 설계

安秉根,朴廣炫 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2

For the purpose of the secure communication, a study of the modulation circuit of chaotic frequency shift keying is presented. In this paper, the modulation citcuit of chaotic frequency shift keying was designed with two synchronization methods-the coupled and the drive synchronization. The designed circuit was simulated for the cases of no-load, 1K-load,3.6K-load and load of opeational anplifier respcetively. As a result of simulation,two chua's circuits which genitate two chaos signals,using coupled synchronization method is not affected from the output stage by using the operational amplifier for drive synchronization.

태권도 지도자들이 체육관 경영 시 고려하는 주요 요인 분석

조광민,이건희,김상유 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.3

Taekwondo which has adopted as a formula competitive games in 2004 Athens Olympic is establishing itself as world-widely recognized marshal arts, Taekwondo training centers which perform most of Taekwondo education, however, have been giving rise to many problems, Among others, reduction of the number of training peoples and limited an age group are the most serious ones. The purpose of this study was to help the Taekwondo trainers with solving various problems, such as facilities, trainer's quality, and training programs, and with consequently managing successful training center. It was abstracted by cluster random sampling method from Taekwondo Masters who work or operate Taekwondo Gym A questionnaire was sent to a Taekwondo Masters, Out of 300 copies, 196 copies were actually used in the practical analysis, Any copies with lost pages or insincere answers were excluded. For this study, SPSS 11.0 for Windows statistic package were used to analyzing collected samples, To analyze the data, frequency analysis, multiple responses, t-test, factor analysis, One-way ANOVA were conducted. And Scheffe method was used for the post analysis, investigating the propriety of the questionnaire, the factors analysis was executes by varimax after the professionals' review about the selecting Taekwondo Gym. As the result of the factor analysis, Factor 1 was named as the master's talent, Factor 2. as the accessive to the Taekwondo Gym and Factor 3 as the facility of Taekwondo Gym, And internal, external of Master, In the questionnaire of this study, reliability was used to verifying All Cronbach's a were over .700. As a conclusion, a diet program or a physical-training program need be developed forvarious groups of customers from the youth to the old, and training programs and in future study, marketing strategy for regional. needs should also be made.

Ni-Zn Ferrite/Rubber복합형 전파흡수체의 정합조건 설계

김한근,사공건,신광호 東亞大學校 1994 東亞論叢 Vol.31 No.1

The demands for microwave absorbing materials and designs are being increased. We have studied about a new design technique to seek for the matching conditions for composite absorbers. The ferrite/rubber composite microwave absorbers were fabricated with Ni-Zn ferrite prepared by coprzcipitation method and silicone rubber. We have figured out the matching conditions(frequency and thickness) through the material constants of the self-maded ferrite/rubber composite absorber by utilizing the matching map and the matching boundary map. We could make a prediction for the matching conditions of ferrite/rubber composite absorber with our developed design technique.

Arch교의 橫桁連結部 局部應力과 疲勞擧動에 관한 硏究

최광순,조호근,손영호,최광규 동아대학교 건설기술연구소 1997 硏究報告 Vol.21 No.2

In this paper, the relation between the local stress and the fatigue behavior at gusset plate connected with main girder and floor beam in arch bridges was obtained. The conclusion was as follows : (1) In-plane bending moment and out-of-plane bending moment are higher than other internal stress resultants. (2) When a vehicle crosses the bridges, the change of out-of-plane bending moment corresponds with the change of relative difference in displacement in the longitudinal direction between the tie-girder and stringer. (3) The change of in-plane bending moment corresponds with the change of the displacement in the transverse direction of arch-rib. (4) Fatigue crack can be initiated by in-plane bending stress that Is produced by out-of-plane bending moment at the toe of gusset plate. (5) Fatigue crack can be initiated by tension stress that is produced by in-plane bending moment at the toe of gusset plate.

비만 및 정상체중 여고생의 체력 비교분석

추건이,이광석 仁荷大學校 스포츠科學硏究所 1998 論文集 Vol.10 No.-

In order to investgate the relationship between the degree of obesity and physical fitness, a comparative study was performed. Degree of obesity was calculated by fomula using Standard Height-Weight chart and bodyweight. Total of 1472 high school girls were put into one of 3 group (Group 1 (normal): less than 20%, Group 2 (light obesity): 20-3O%, Group 3 (heavy obesity): 30%-5O%). Each subject performed six events (100M running, standing borad jumping, throwing, sit-up, long distance run(800M), glinging). T-test identified the difference between two means for the groups. The conclusions are as follows. 1. 1OOM Running (1) There was no difference between Group 1 and Group 2. (2) There was no difference between Group 1 and Group 3. 2. Long Jump (1) There was no difference between Group 1 and Group 2. (2) There was no difference between Group 1 and Group 3. 3. Throwing (1) Throwing distance was significantly greater for Group 2 than for Group 1. (p<.05) (2) Throwing distance was significantly greater for Group 3 than for Group 1. (p<.01) 4. Glinging (1) Hang time was significantly smaller for Group 2 than for Group 1.(p<.01) (2) Hang time was significantly smaller for Group 3 than for Group 1.(p<.01) 5. Sit-up (1) Number of sit ups was significantly lower for Group 2 than for Group 1. (p<.01) (2) Number of sit ups was significantly lower for Group 3 than for Group 1.(p<.01) 6. Long Distance Run (1) Running time was was significantly longer for Group 2 than for Group 1.(p<.01) (1) Running time was was significantly longer for Group 3 than for Group 1.(p<.01)

연폭로 수준에 의한 공기중 연농도와 혈액중 연농도간의 상관성

박석건,김광종,장성훈 大韓産業醫學會 1991 대한직업환경의학회지 Vol.3 No.1

The correlation between the lead concentration in air at work site and in blood among three different groups of workers was studied. The test subjects were 50 lead solderers in an eleotronic company(Group 1). 66 lead smelters(Group 2). 40 workers in storage battery factory(Group 3). The results were as follows: 1. The geometric mean of air lead concentration in Group 3 was the highest level among the three groups at 0.226 mg/㎥ (0.070-1.475 mg/㎥). The lead concentrations at work sites were found to be significantly different among, the three groups. 2. The mean of blood of lead concentration in Group 3 was 74.3 ㎍/dl(17.0-149.3 ㎍/dl) was also the highest level among the three groups. The levels of lead concentration among the three groups were significantly different. 3. In Group 2 and 3, the correlation coefficient between lead concentration in air and in blood was statistically significant. The correlation coeffioient was found to increase with the level of lead exposure.

Arch교의 橫桁連結部 局部應力과 疲勞擧動에 관한 硏究

최광순,조호근,손영호,최광규 東亞大學校 建設技術硏究所 1997 硏究論文集 Vol.21 No.2

In this paper, the relation between the local stress and the fatigue behavior at gusset plate connected with main girder and floor beam in arch bridges was obtained. The conclusion was as follows : (1) In-plane bending moment and out-of-plane bending moment are higher than other internal stress resultants. (2) When a vehicle crosses the bridges, the change of out-of-plane bending moment corresponds with the change of relative difference in displacement in the longitudinal direction between the tie-girder and stringer. (3) The change of in-plane bending moment corresponds with the change of the displacement in the transverse direction of arch-rib. (4) Fatigue crack can be initiated by in-plane bending stress that is produced by out-of-plane bending moment at the toe of gusset plate. (5) Fatigue crack can be initiated by tension stress that is produced by in-plane bending moment at the toe of gusset plate.

논에서 물과 양분관리에 따른 메탄(CH_4), 아산화질소(N_2O) 배출 특성

김건엽,박상일,송범헌,신용광 한국환경농학회 2002 한국환경농학회지 Vol.21 No.2

물관리방법을 달리한 상시담수와 간단관개에서 메탄과 아산화질소의 배출 양상과 서로 다른 종류의 유기물원 및 질소비료 시용에 따른 메탄과 아산화질소 배출을 비교하고 저감 할 수 있는 방법을 찾기 위해 본 시험을 실시하였다. 물관리방법으로는 상시담수 (이앙∼출수 35일까지 담수)와 이앙 35일 이후 중간낙수한 간단관개 (중간낙수기간 20일),그리고 시비방법으로는 토양을 검정한 시비량인 토양검정, 토양 검정시비량+볏짚 돈분액비, LCU 완효성비료 그리고 N을 시용하지 않은 대조구 등을 처리하여 메탄 및 아산화질소 배출량을 측정하였다. 메탄 배출량은 간단관개보다 상시담수에서 높았고, 아산화질소 배출량은 이와 반대로 나타났다. 유기물과 비료시용 종류에 따른 메탄과 아산화질소 배출량은 액비와 검정시비+볏짚시용구에서 가장 높았으며, LCU 완효성비료구에서 가장 낮았다. 지구온난화잠재력으로 환산한 온실가스 배출은 물관리 조건에서 상시담수가 간단관개보다 170∼208% 높았으며, 요소를 시용하고 상시담수를 기준 한 것과 간단관개로 물 관리하여 각 처리에 따라 온실가스 배출을 비교하면 요소는 41.4%, LCU 완효성비료 55.8%로 온실가스 배출을 줄일 수 있는 것으로 나타났다. 그리고 비료이용효율은 LCU완효성비료, 액비>검정시비+볏짖>검정시비 순이었다. Emission of methane and nitrous oxide affected by nitrogen fertilizer materials were measured simultaneously in rice paddy fields under flooding and intermittent irrigation in 2000. Studies focused on mitigating CH_4 emission from rice paddy fields are summarized and the possibilities and limits applied to world's rice cultivation are discussed. The mitigation options are water management, soil amendments, organic matter management, different tillage, rotation, and cultivar selection. Altering water management, in particular promoting midseason aeration by short-term drainage, is one of the most promising strategies, although these practices may be limited to the rice paddy fields where the irrigation system is well prepared. The test site was divided into two water managements: a continuously flooded plot which was maintained flooded by constant irrigation from May to September, and an intermittently drained plot in which short-term (20days) draining practices were performed one times during the flooding period. By total emission of GHGs converted by global warming potential (GWP), flooding plots were higher 170~208% than intermittent irrigation plots. For emission of GHGs in fertilizer materials, it was high in the order of Swine slurry>Urea+Rice straw>Urea>LCU. Basing on GHGs emission of urea fertilization under flooding as baseline GWP of urea fertilization and Latex-coated urea under intermittent irrigation showed lower GHGs emission by 41.4% and 55.8%, respectively. In this case fertilizer use efficiency (kg unhulled rice/kg of applied N) were 18.2~20.2 and 18.7~19.0 and 9.3 and 5.8~6.6 for Swine slurry and LCU and Urea+Rice straw and Urea in the continuously flooded and intermittently drained plot.