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.

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.

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

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.

실내 골프 연습장 단골고객의서비스애호도 결정요인에 관한 연구

설민신 한경대학교 2007 論文集 Vol.39 No.-

It was the precedence pivot of their protection island in an object in favorite customer (relational customer) that the loyalty degree for an indoor driving range was high and even the precedence pivot examined, Relations between customers and the influence in a study. If it tries to summarize analysis of a study it seems to be next. First, Quality of service, In other words result of service, Mutual relations with service provider and a consumer, And it was confirmed by having influence that all the physical environment paid attention to customer satisfaction. In addition, I was able to confirm that general satisfaction for service had an affirmative influence on name value for service provider. The second, However, I appeared in what I did not have influence that the result and the environment of service paid attention to switch expense in quality of service on and, But I appeared by having influence that only mutual relations characteristics among service provider and a consumer paid attention to switch expense. The third, General satisfaction for service and name value for service provider, And I appeared by having influence that the switch expense that it was late for paid attention to recycling intention for specification service. The fourth, Satisfaction for service, Large Korea name value among service provider, And I appeared by having influence that the recycling intention paid attention to learning through the grapevine.

음악비평의 역사와 실제

신설령 민족음악연구소 1994 음악과 민족 Vol.8 No.-

단면 CT 영상을 이용한 무치악 하악 대구치부 잔존골의 형태 분석

이설미,허경회,이원진,허민석,이삼선,강태인,최순철 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.3

Purpose : The purpose of this study was to evaluate the morphologic features of posterior edentulous mandible for Korean patients using cross-sectional CT images. Materials and Methods : Computed tomographic cross-sectional views taken in 2004 and 2005 at Seoul National University Dental Hospital were analyzed by an oral and maxillofacial radiologist. Four indices were measured to meet the purpose of this study: 1) the horizontal distance between the alveolar crest and mandibular canal (Type), 2) the angle of the mandibular long axis (Angle), 3) the bucco-lingual location of mandibular canal, and 4) the depth of the submandibular fossa. The averages and standard deviations of the measurements were compared according to the location (the first and second molar area) and sex of the patients. Results : Statistically significant difference was found in Type, Angle, and submandibular fossa depth between the first and second molar area (P<0.05). However, there was no significant difference between men and women in any of the measured indices. Most of the mandibular canals were located in lingual side of posterior mandible. Conclusion : More care should be taken when an implant is installed on the mandibular second molar area.

18세기 영 소설에 나타난 결혼과 가족관계

김설자 亞洲大學校 1983 論文集 Vol.6 No.-

The aim of this paper is to describe the special features of marriage and the family depicted by the 18th century major novelists in their works, With the rise of protestantism and capitalism a new conception of marriage (companionship based on mutual love) was brought early to England. However, in practice for most marriages in the 18th century England the main consideration was still the property. Thus, property marriage was one of the prevalent themes in the novels of the period. The conflicts between two concepts of marriage, one based on romantic love and the other based on the property interests, were also invariably dealt with in almost every major novel. In developing the marriage theme, most writers employed the family as a microcosm of the world. Thus, the family structure of the period was reflected in their works. Usually, the father was the absolute head of the family and a woman's property became her husband's on marriage. Daughters were considered as the property of their parents. Under these circumstances, in the novels of the period we witness property marriage, hypergamy, mock marriage, bigamy and adultery, and monogamy. These were portrayed faithfully by writers of the period whose works are believed to be reflections of their society.