The roles of surface chemistry and topography in the strength and rate of osseointegration of titanium implants in bone

Sul, Young-Taeg,Kang, Byung-Soo,Johansson, Carina,Um, Heung-Sik,Park, Chan-Jin,Albrektsson, Tomas Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of biomedical materials research. Part A Vol.a89 No.4

<P>The present study investigated the effects of surface chemistry and topography on the strength and rate of osseointegration of titanium implants in bone. Three groups of implants were compared: (1) machine-turned implants (turned implants), (2) machine-turned and aluminum oxide-blasted implants (blasted implants), and (3) implants that were machine-turned, aluminum oxide-blasted, and processed with the micro-arc oxidation method (Mg implants). Three and six weeks after implant insertion in rabbit tibiae, the implant osseointegration strength and rate were evaluated. Surface chemistry revealed characteristic differences of nine at.% Mg for Mg implants and 11 at.% Al for blasted implants. In terms of surface roughness, there was no difference between Mg implants and blasted implants in developed surface ratio (Sdr; p = 0.69) or summit density (Sds; p = 0.96), but Mg implants had a significantly lower arithmetic average height deviation (Sa) value than blasted implants (p = 0.007). At both 3 and 6 weeks, Mg implants demonstrated significantly higher osseointegration strength compared with turned (p = 0.0001, p = 0.0001) and blasted (p = 0.0001, p = 0.035) implants, whereas blasted implants showed significantly higher osseointegration than turned implants at 6 weeks (p = 0.02) but not at 3 weeks (p = 0.199). The present results not only support the hypothesis that biochemical bonding facilitates rapid and strong integration of implants in bone, but also provide evidence for biochemical bonding theory previously proposed by Sul. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009</P>

Color Change in Mixed Zinc Sulfide Composite Displays due to a Biased AC Electric Field

Kim Taehun,Kim Ha Sul 한국물리학회 2023 새물리 Vol.73 No.8

In this study, we developed two types of electroluminescent (EL) devices. One type was made solely of ZnS:(Cu, Al, Mn) composite and the other type was a mixture of the ZnS:(Cu, Al, Mn) and ZnS:(Cu, Cl) composites. The light-emitting device was fabricated by mixing ZnS phosphor and polydimethylsiloxane between two indium tin oxide glasses. When the ZnS:(Cu, Cl) composites were added to the ZnS:(Cu, Al, Mn) composites, the intermixed EL device emitted brighter light than the device fabricated with only the ZnS:(Cu, Al, Mn) composite at the same bias and frequency. The International Commission on Illumination color coordinates of the EL devices produced with only the ZnS:(Cu, Al, Mn) composites and with the intermixed ZnS:(Cu, Al, Mn) phosphors and ZnS:(Cu, Cl) composites were (0.30, 0.40) and (0.24, 0.42), respectively, at 100 Hz. These values changed to (0.28, 0.31) and (0.23, 0.32), respectively, at 500 Hz. We believe that the ZnS EL device composed of the two mixed composites could be utilized as an illumination light source for large-area displays, which, in turn, require active color expression.

반도체 제조장비 시험평가원 구축

설용태 호서대학교반도체제조장비국산화 연구센터 2000 반도체 장비기술 논문집 Vol.2000 No.-

반도체 제조장비는 매우 높은 정밀도와 신뢰성이 요구되는 초정밀 시스템으로서 개발이 완료되어 실제 Product line 에 투입되기까지는 오랜 시간 동안 엄격한 시험 평가를 통하여 신뢰성이 입증되어야 한다. 그러나 국내 중소 업계의 경우 고가 시험평가 설비를 보유하고 있지 않아 연구 개발에 많은 어려움을 겪고 있다. 이에 본 과제는 반도체 제조장비 국산화 연구 센터의 국내에서 개발된 반도체 제조장비, 부품/Module 등에 대한 신뢰성을 입증할 수 있는 시험 평가원 구축을 위한 기반 시설 구축과 방향 등에 대한 연구이다

대학생의 개인재무관리역량

이슬기, 박현정, 김민정 충북대학교 생활과학연구소 2012 생활과학연구논총 Vol.16 No.1

The purpose of this study is to measure financial competency of students in Chung-buk national university. The financial competency included financial attitude, financial knowledge, and financial skills. The major findings are as follows: First, as the financial management competency of university students, their attitude towards financial management was 75 points, knowledge in financial management was 68.5 points, and financial management skill was 59.9 points. Second, male students showed higher scores than female students in all areas. Third, students in the fields of medicine, education, and laws showed higher levels of financial management knowledge yet their financial management skill was low. Forth, students who receive allowances from parents showed high points of attitude towards financial management yet their financial management skill was low. Those who receive allowances from people that are not parents showed lower points in the attitude towards financial management or the knowledge than those who do not receive allowances. Fifth, students who spend money they earned showed higher points in every area than other students’ points. Finally students who received financial education showed similar or lowered points in financial management attitude and financial management knowledge with students who did not receive the financial education. However, the level of their financial management function was higher. Students who have saving accounts, periodicaldeposits, fixed deposits, a check card, or debit card showed higher levels of financial management knowledge and function that those who do not have the above items.

靑少年 性敎育 計劃을 爲한 性에 對한 知識·態度 및 經驗에 관한 基礎調査 : 일부 小都市 高三 男學生을 中心으로 Specially, the junror year of high school male students in the regional small city

金雪紫 김천과학대학 1980 김천과학대학 논문집 Vol.8 No.-

Recently the increasing tendency of adolescents toward the problem of adolescents sexual crime, veneral disease, abortion and unwed mothers has been observed and regarded as a social problems which requires urgent and concrete solutions. This survery was attempted for the purpose of presenting some data helpful for planning the fundamentals of a sex education plan. Thus, the general aims of this survey are to ; 1, Find out high school male students' knowledge, attitude and experience in sex. 2. Find out the need for high school male students' sex education. 238 purposely selected students were in their junior year in high school in B city. The group survey method was used for colleetion of data with a questionnaire which was developed espeeially for this survey. Data was collected for 4 days from Oct. 13th to Oct. 16th in 1980. Frequency, percentage and mean, standard deviation for age are used for statistical analysis. Results of this survey can be summarized as follows. 1. Knowledge. High school male students are lacking in the knowledge of veneral disease, purity, ovulation time, contraception. pregnancy, fertilization and reproductive physiology. 2. Attitude More students tend to think pre-marital sexual experience is acceptable if love is present. Approximately 50% of the students permit pre-marital pregnancy. 3. Experience. 29.8% of the students had sexual experience. Students who made someone become pregnant was 3.4% and 2.9% experienced abortion with their partners. Students who experienced veneral disease are 3.8% and the percentage of the students who had sexual intercourse with prostitutes was 12.6%. 16.0% of the students had experienced homosexuality. 4. Needs of sex education for high school students. Based on the survey results, contents of sex education necessary for high school students are ;Knowledge of veneral disease , purity, ovulation time, contraception, pregnancy, reproductive physiology, abortion, the control method of sexual desire, the value and conception of purity the right attitude toward pre-marital sexual experience, masturbation, hygienic sexual activities and counselling. In conclusion, sex education is needed and must be taught as a new subjest which contains all aspects sex education Sex education must be taught as a regular course in the curriculum of all korean high schools of all levels.

르네쌍스 음악양식의 형성과정에 대한 연구 : 던스타블·뒤파이·죠스캥을 중심으로

신설령 민족음악학회 1996 음악과 민족 Vol.11 No.-

초등학교 학생들의 귀납연역적 추론 능력과 정신 용량 및 보석 오류와의 관계

김설한,정진우,김효남 한국교원대학교 과학교육연구소 1998 청람과학교육연구논총 Vol.8 No.1

The purpose of this study was to analyze the problem solving strategies of elementary school students and to find out correlations between the functional mental capacity, the perseveration error and the Creature Card Task solving ability. To study this purpose, four categories were selected through pilot test. The sample consisted of 231, the 4th grade students and the 5th grade students in Inchon, Korea and selected 32 students among them. Three instruments were used in this study, Creature Card Task, FIT(Figural Intersection Test) and WCST(Wisconsin Card Sorting Test). Researcher interviewed 32 students about Creature Card Task solving strategies and tests with FIT, WCST. Major findings of the study are as follows: 1. Creature Card Task solving strategies of the selected 4th & 5th grade students were different. Some students solved problems during individual interviews. 2. Creature Card Task solving abilities were significantly correlated with the functional mental capacity and the perseveration error.

방사선사진과 안모사진을 이용한 하악 비대칭의 평가

이설미 大韓口腔顎顔面 放射線學會 2001 Imaging Science in Dentistry Vol.31 No.4

Purpose : To assess the relationship between soft tissue asymmetry and bone tissue asymmetry using the standardized photographs and the posteroanterior (PA) cephalometric radiographs in mandibular asymmetric patients. And to clarify that the lack of morphologic balance among different skeletal components can often be masked by compensatory soft tissue contributions. Methods : Experimental group consisted of 58 patient whose chief complaints were facial asymmetry, they were taken with standardized facial photographs and PA cephalometric radiographs. Control group consisted of 30 persons in the normal occlusion. The reproducibility of the facial photograph was confirmed by model test. The differences of fractional vertical height and horizontal width from standardized facial photographs and PA cephalometric radiographs were compared and analyzed. Results : The difference of fractional vertical bone height was 0.63 and fractional vertical soft height was 0.58 in control group, 3.10 and 2.01 in asymmetric group, respectively. The difference of fractional horizontal bone width was 0.52 and fractional horizontal soft width was 0.70 in control group, 2.51 and 1.70 in asymmetric group, respectively. Both soft and bone tissue showed significant difference between control and asymmetric group (p<0.05). The difference of bone tissue was greater than that of soft tissue (p<0.05) in the experimental group but, not in control group. Conclusion : Soft tissue components may compensate for underlying skeletal imbalances. (Korean J Oral Maxillofac Radiol 2001; 31 : 199-204)

간호교육에 있어서 Projected Media

金雪紫 김천과학대학 1986 김천과학대학 논문집 Vol.14 No.-

Sudden increase of the student population and knowledge have brought to use audiovisual media as a educational method which delivery a lot of knowledge rapidly. Media use make attain to the educational goal, the learner take part in learning voluntarily and the learner themself gain the function that discover and understand the problems. Most of the educational curriculums are mentioned by media instructions. If the correct media use promptly and effectively, it will agree with nursing goals, philosophies and conceptual frameworks which teachers desire. The audiovisual media is seen from mass communication and direct learning viewpoint. If teachers use audiovisual media to nursing clinical practice, it will be much helpful to patient care in the clinic. When teachers use audiovisual media as a auxiliary instrument of the nursing instruction,the goal of audiovisual media must agree with total nursing educational curriculum. The audiovisual media play an important role on voluntary and active learning program viewpoint. Nursing teachers must know how to use audiovisual media effectively, utilize prompt time and must study hard to manage and treat audiovisual teaching materials correctly. Nowadays, scales of audiovisual education are developing and expanding gradually on the approach of educational tehchnology viewpoint. The above studies suggest that ; 1. The establishment of facilities in connection with research and development of audiovisual program relate to nursing. 2. The establishment of audiovisual library on a national scale. 3. Multimedia approach on the instruction technology viewpoint.

음악비평의 역사와 실제

신설령 민족음악연구소 1994 음악과 민족 Vol.8 No.-