구연산과 칼슘이 치아침식증의 발생에 미치는 영향

송인경,이광희,김대업,양영숙 大韓小兒齒科學會 2005 大韓小兒齒科學會誌 Vol.32 No.3

산성 음료의 치아침식증 유발력을 감소시키기 위한 연구의 일환으로, 0.1%, 0.3%, 0.5%, 1.0% 구연산용백의 5분, 15분, 30분, 60분간의 사람 소구치 법랑질의 치아침식증 유발력 및 구연산용액에 첨가되는 칼슘 0.05%, 0.1%, 0.2%에 따른 치아침식증 발생 억제효과를 표면미세경도를 측정하여 연구하였다. 전체적으로 볼 때, 구연산 농도가 높을수륵, 탈회시간이 길수록, 칼슘농도가 낮을수록 탈회후 경도가 하락하였다. 탈회 5분 후 경도는 칼슘 무첨가의 경우에 76~90%이었고 칼슘 첨가에 따른 5분간의 탈회억제량은 2~l5%이었다. 탈회 15분 후 경도는 칼슘 무첨가의 경우에 65~84%이었고 칼슘 첨가에 따른 15분간의 탈회억제량은 3~l7%이었다. 탈회 30분 후 경도는 칼슘 무첨가의 경우에 53~72%이었고 칼슘 첨가에 따른 30분간의 탈회억제랑은 6~22%이었다. 탈회 60분 후 경도는 칼슘 무첨가의 경우에 43~66%이었고 칼슘 첨가에 따른 60분간의 탈회억제량은 7~l9%이었다. 탈회억제량의 분포를 전체적으로 보면, 구연산 농도에서는 1.0%에서 가장 크게 나타났고, 칼슘농도에서는 0.2%에서 가장 크게 나타났으며, 탈회시간에서는 0,1% 구연산용액에서는 탈회시간이 증가함과 더불어 탈회억제량도 함께 커지는 경향을 보였으나, 0.3% 이상의 구연산용액에서는 30분에 가장 크고 60분에 약간 감소하는 경향을 보였다 이상의 결과는 구연산에 의한 치아침식증 발생에 칼슘이 억제효과를 나타낼 수 있음을 시사한다. The purpose of study was to observe the effect of calcium and citric acid on the dental erosion of human premolar enamel. Enamel specimens were demineralized in 0.1%, 0.3%, 0.5%, or 1.0% citric acid solutions with 0.05%, 0.1%, or 0.2% calcium for 5, 15, 30, and 60 minutes, and then the surface microhardness of the enamel was measured. The hardness decreased as the concentration of citric acid and the demineralization time increased. Hardness after 5 minutes was 76~90% in case of no calcium and the inhibition of dental erosion by calcium addition was 2~15%. Hardness after 15 minutes was 65~84% in case of no calcium and the inhibition of dental erosion by calcium addition was 3~17%. Hardness after 30 minutes was 53~72% in case of no calcium and the inhibition of dental erosion by calcium addition was 6~22%. Hardness after 60 minutes was 43~66% in case of no calcium and the inhibition of dental erosion by calcium addition was 7~19%. The inhibition was the highest in 1.0% citric acid and 0.2% calcium. In 0.1% citric acid the inhibition increased as the demineralization time increased, but in 0.3% to 1.0% citric acid the inhibition was most high at 30 minutes and decreased a little at 60 minutes. These results suggest that calcium has a inhibitory effect on the citric acid induced dental erosion.

부산지역 환경관련 제조업의 산업연관분석

이대식,김경필 釜山大學校 商科大學 2001 釜山商大論集 Vol.72 No.-

The purpose of this paper is to evaluate the industrial importance of the environment industry in Pusan through regional input-output analysis. In the absence of the consensus on the definition and scope of environment industry and related data, this research inevitably focuses on environmental manufacturing industry. There are various techniques in converting the coefficients of a national table to those of a regional table. Among them, it is said that RAS procedure is most widely used method. So that method is adopted also in this research. The regional table can be obtained through 360 iterative adjustments of rows and columns by using GAUSS program. The empirical findings of this research show that among the manufacturing industries in Pusan environmental manufacturing industry has relatively strong backward linkage effect and the weakest forward linkage effect. From the above findings, if the demands for environmental industry in Pusan can be created by government policies, we can infer that the growth of other industries as well as environmental industry can be expected.

초등 사회과 3학년 지역화 교수·학습자료개발 연구

홍기대,손정선,김언식,김용조,이광성,김경운 光州敎育大學校 初等敎育硏究所 2002 初等敎育硏究 Vol.17 No.-

The purpose of this study is in developing locally-oriented teaching-learning materials to motivate students to effectively take part in activities using map and in improving the field work of social studies to plan a map learning and to give them the ability of practice. It represents the right order involved in teaching the activities using map after doing preceding learning : classroom, playground, and the environs of the school including to some learning methods such as a puzzle map, a correlative of learning. Field trip study planning and lesson-plan are designed in case of Sewage disposal plant, Duknam filtration plant, Bonchon industrial complex relating to field trip study. There are some effects expected which follow through this study. First, teachers are able to draw learner's interest in finding learning sources directly through the community where they live. Second, learners have active participation in class, motivation, drawing their interests through map learning by doing preceding study of learner-centered. Third, teachers can make use of it as useful tools to get high achievement goal with self-direct learning.

생산자 입장에서 본 단기소득임산물의 유통문제

김의경,김병택,정병헌,김대현 慶尙大學校 地域開發硏究所 1999 地域開發硏究 - 慶尙大學校 地域開發硏究所 Vol.10 No.-

건강인에서 결핵균 30-kDa항원이 말초혈액 임파구증식에 미치는 영향

최대경,고석신,김화중,조은경,백태현,신철식 충남대학교 의과대학 지역사회의학연구소 1991 충남의대잡지 Vol.18 No.1

T lymphocytes are thought to play a central role in cell mediated immune response. To Study the T lymphocyte proliferative response to 30-kDa antigen purified from Mycobacterium tuberculosis H37Rv, peripheral blood lymphocytes isolated from healthy subjects were stimulated with the 30kDa antigen, crude antigen or PHA. Healthy subjects were divided into three groups so that PPD(+), PPD(±) and PPD(-). The proliferations of lymphocytes were measured by the incroporation of ^3H-thyrnidine. The results were summarized as follows: 1. For the PPD(+) person, at concentration of < 1 ㎍/ml, the proliferative response to 30-kDa antigen resulted in a mild reduction but crude antigen showed relatively rapid reduction. For the PPD(-) person, decreasing the concentration of the both antigens showed rapid reduction of proliferation 2. The lymphocytes proliferations to 30-kDa antigen and crude antigen were significantly increased in PPD(+) group when compared to those in PPD(-) group, but PHA response was no significant difference. 3. The sensitivity and specificity of lymphocyte proliferation assay to 30-kDa antigen and crude antigen when compared with skin test results were 92.3%, 100% and 76.9%, 50%, respectively.

Radiation Stress에 의한 尙州海水浴場의 海濱流 解析

安庚模,張大正,咸契運 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-

In this paper, authors analyzed to discuss on the nearshore current characteristics with radiation stress concept. And authors calculated on the nearshore current velocity at SANGJU beach. Discussed and calculated results are as follows; 1. The direction of incident wave affected with radiation stress and nearshore currents. 2. With the analysis results, nearshore currents at the vicinity of groin increased coastal erosion at SANGJU beach. The model results show a qualitatively good agreement with observed patterns in the field.

산업용 이차전지의 열화진단에 관한 연구

장대경,황호석,박민기 서울産業大學校 2005 논문집 Vol.54 No.3

This paper proposes a new degradation diagnosis method of secondary battery in order to improve a battery economy. In the proposed method, a bad cell is detected by the measurement of DC internal resistance and the battery capacity is estimated by the electric discharge test in a short period of time, which can be used to determine the time to replace the battery. Through the computer simulation and actual experimentation, the proposed method's validity is confirmed by comparing and analyzing the performance. As a result, we show that it is possible to estimate the accurate capacity of secondary battery in a short space of time.

Radiation Stress 에 의한 尙州海水浴場의 局所 海濱流 解析

咸契運,張大正,安庚模 慶尙大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.14 No.-

In this paper, authors analyzed to discuss on the near-shore current characteristics at the vicinity of groin with radiation stress concept. And authors calculated on the near-shore current velocity at SANGJU beach. Discussed and calculated results are as follows; 1. With the analysis results, near-shore current velocity is about 4 times that's of non-groin and radiation stress is about 3 times that's of non-groin. 2. The pattern of near-shore current is very important to sediment movement. 3. In this study, to compare numericial analysis with esbablished data was qualitatively harmonized.

밤의 유통마진 및 유통체계에 관한 연구

김병택,김의경,정병헌,김대현 慶尙大學校 地域開發硏究所 1999 地域開發硏究 - 慶尙大學校 地域開發硏究所 Vol.10 No.-

Acyclic Diterpenoids from the Leaves of Capsicum annuum L

Jin Gyeong Cho,Dae Young Lee,Jae Woong Lee,Do Gyeong Lee,Mi Young Baek,Eun Mi Ahn,Youn Hyung Lee,Nam In Baek 한국응용생명화학회 2008 Applied Biological Chemistry (Appl Biol Chem) Vol.51 No.5