• Maxillofacial Plastic and Reconstructive Surgery
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• 제42권
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• pp.18.1-18.9
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• 2020

Background: Bone grafting has been considered the gold standard for hard tissue reconstructive surgery and is widely used for large mandibular defect reconstruction. However, the midface encompasses delicate structures that are surrounded by a complex bone architecture, which makes bone grafting using traditional methods very challenging. Three-dimensional (3D) bioprinting is a developing technology that is derived from the evolution of additive manufacturing. It enables precise development of a scaffold from different available biomaterials that mimic the shape, size, and dimension of a defect without relying only on the surgeon's skills and capabilities, and subsequently, may enhance surgical outcomes and, in turn, patient satisfaction and quality of life. Review: This review summarizes different biomaterial classes that can be used in 3D bioprinters as bioinks to fabricate bone scaffolds, including polymers, bioceramics, and composites. It also describes the advantages and limitations of the three currently used 3D bioprinting technologies: inkjet bioprinting, micro-extrusion, and laserassisted bioprinting. Conclusions: Although 3D bioprinting technology is still in its infancy and requires further development and optimization both in biomaterials and techniques, it offers great promise and potential for facial reconstruction with improved outcome.

• The Journal of Advanced Prosthodontics
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• 제9권4호
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• pp.239-243
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• 2017

PURPOSE. The purpose of this study is to compare single and three-unit metal frameworks that are produced by micro-stereolithography. MATERIALS AND METHODS. Silicone impressions of a selected molar and a premolar were used to make master abutments that were scanned into a stereolithography file. The file was processed with computer aided design software to create single and three-unit designs from which resin frameworks were created using micro-stereolithography. These resin frameworks were subjected to investment, burnout, and casting to fabricate single and three-unit metal ones that were measured under a digital microscope by using the silicone replica technique. The measurements were verified by means of the Mann-Whitney U test (${\alpha}=.05$). RESULTS. The marginal gap was $101.9{\pm}53.4{\mu}m$ for SM group and $104.3{\pm}62.9{\mu}m$ for TUM group. The measurement of non-pontics in a single metal framework was $93.6{\pm}43.9{\mu}m$, and that of non-pontics in a three-unit metal framework was $64.9{\pm}46.5{\mu}m$. The dimension of pontics in a single metal framework was $110.2{\pm}61.4{\mu}m$, and that of pontics in a three-unit metal framework was $143.7{\pm}51.8{\mu}m$. CONCLUSION. The marginal gap was smaller for the single metal framework than for the three-unit one, which requires further improvement before it can be used for clinical purposes.

• 한국의류학회지
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• 제29권11호
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• pp.1399-1409
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• 2005

The purpose of this study was to analyze the shape of gathered skirts using a three-dimensional measurement system. And in this experiment, I try to accumulate three-dimensional data of wearing model and to figure out analyzing method made by shape of clothes. The experimental design consists of two factorial designs. I set up three different kinds of fabrics, ratio of gathers. Therefore nine samples were made. The instrument and tools for three-dimensional measurement was whole body 3D scanner. Analysis program used in experiment is RapidForm 2004 PP1 and Pattern Design 2000. Data analysis utilizes SPSS WIN 10.0 Package. T-test to effect an inspection of evidence, there was difference about measurement times. One-way ANOVA to analysis effect of gather made by gathering conditions. The following results were obtained; 1. As a result of inspecting an error several times using a three-dimension measurement system, convinced data was obtained. 2. At front, distribution of gap amount was larger than back. And as ratio of gathers increased, distribution of gap amount showed regularly. 3. After analyzing horizontal sectional figure of skirts, as a height of skirt changed from waist to the bottom of skirts, the results showed as follows. While section width, section thickness, node width, node depth increased, node count decreased. 4. With the horizontal section levels of gather skirt, the silhouette on middle hip section was similar with the silhouette of body line. And as ratio of gathers around hip section increased, nodes showed regularly. At the bottom of skirts showed different nodes by different gathering condition.

• Asia pacific journal of information systems
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• 제19권1호
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• pp.1-31
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• 2009

This paper empirically examines factors that potentially influence the success of a Web-based semantic search engine. A research model has been proposed that shows the impact of quality-related factors upon the effectiveness of a semantic search engine, based on DeLone and McLean's(2003) information systems success model. An empirical study has been conducted to test hypotheses formulated around the research model, and statistical methods were applied to analyze gathered data and draw conclusions. Implications for academics and practitioners are offered based on the findings of the study. The proposed model includes three quality dimensions of a Web-based semantic search engine-namely, information quality, system quality and service quality. These three dimensions each have measures designed to collectively assess the respective dimension. The model is intended to examine the relationship between measures of these quality dimensions and measures of two dependent constructs, including individuals' net benefit and user satisfaction. Individuals' net benefit was measured by the extent to which the user's information needs were adequately met, whereas user satisfaction was measured by a combination of the perceived satisfaction with search results and the perceived satisfaction with the overall system. A total of 23 hypotheses have been formulated around the model, and a questionnaire survey has been conducted using a functional semantic search website created by KT and Hakia, so as to collect data to validate the model. Copies of a questionnaire form were handed out in person to 160 research associates and employees working in the area of designing and developing semantic search engines. Those who received the form, 148 respondents returned valid responses. The survey form asked respondents to use the given website to answer questions concerning the system. The results of the empirical study have indicated that, of the three quality dimensions, information quality was found to have the strongest association with the effectiveness of a Web-based semantic search engine. This finding is consistent with the observation in the literature that the aspects of the information quality should serve as a basis for evaluating the search outcomes from a semantic search engine. Measures under the information quality dimension that have a positive effect on informational gratification and user satisfaction were found to be recall and currency. Under the system quality dimension, response time and interactivity, were positively related to informational gratification. On the other hand, only one measure under the service quality dimension, reliability was found to have a positive relationship with user satisfaction. The results were based on the seven hypotheses that have been accepted. One may wonder why 15 out of the 23 hypotheses have been rejected and question the theoretical soundness of the model. However, the correlations between independent variables and dependent variables came out to be fairly high. This suggests that the structural equation model yielded results inconsistent with those of coefficient analysis, because the structural equation model intends to examine the relationship among independent variables as well as the relationship between independent variables and dependent variables. The findings offer some useful implications for owners of a semantic search engine, as far as the design and maintenance of the website is concerned. First, the system should be designed to respond to the user's query as fast as possible. Also it should be designed to support the search process by recommending, revising, and choosing a search query, so as to maximize users' interactions with the system. Second, the system should present search results with maximum recall and currency to effectively meet the users' expectations. Third, it should be capable of providing online services in a reliable and trustworthy manner. Finally, effective increase in user satisfaction requires the improvement of quality factors associated with a semantic search engine, which would in turn help increase the informational gratification for users. The proposed model can serve as a useful framework for measuring the success of a Web-based semantic search engine. Applying the search engine success framework to the measurement of search engine effectiveness has the potential to provide an outline of what areas of a semantic search engine needs improvement, in order to better meet information needs of users. Further research will be needed to make this idea a reality.

• 한국발생생물학회지:발생과생식
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• 제21권1호
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• pp.55-62
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• 2017

We used flowcytometry to ploidy verification after that investigate difference between diploid and spontaneous triploid through the truss dimension and classical dimension at crucian carp, Carassius auratus, crucian carp C. cuvieri and common carp, Cyprinus carpio collected from Hangang river, Hantangang river, Imjingang river, Geumgang river, Yeongsangang river and Nakdonggang river, Korea. There were significant differences among the three species for the truss dimensions anterior origin of dorsal fin $(2){\times}$ anterior origin of anal fin (5), $2{\times}$ anterior origin of pelvic fin (6), $2{\times}$ origin of pectoral fin (7), posterior origin of dorsal fin $(3){\times}5$, $3{\times}6$, and $3{\times}7$ (P<0.05). There were no significant differences among the three species in the truss dimensions dorsal fin length ($2{\times}9$) and eye diameter (ED)(P>0.05). On the other hand, there were no significant differences in the several classical dimensions of each species (P>0.05). Three classical dimensions, most anterior extension of the head $(1){\times}2$, $1{\times}6$ and $2{\times}$ most posterior scale in lateral line (4) did not differ between the C. auratus diploid and spontaneous triploid (P>0.05). Two classical dimensions, $1{\times}6$ and longest length between most anterior extension of the head and gill cover ($1{\times}8$) did not differ between the C. cuvieri diploid and spontaneous triploid (P>0.05). One classical dimensions, $1{\times}2$ did not differ between the common carp diploid and spontaneous triploid (P>0.05). There were significant differences in the each diploid and triploid species (P<0.05). These results suggest that the classification of each species and classification between diploid and spontaneous triploid morphometrical parameters used in this study are useful indices of morphometrical status in the each species from major river of Korea.

• 서비스연구
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• 제9권3호
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• pp.17-38
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• 2019

최근 공유 경제 문화의 확산으로 소비자의 소비문화가 소유가 아닌 공유로 변화하면서 2030세대를 중심으로 공유 문화가 확산되고 있다. 그러나 차량공유경제시장은 급속도로 성장하는 반면 현재까지 카쉐어링 서비스에 대한 소비자의 행동과 관련된 연구는 많이 진행되지 않았다. 앞으로의 시장성장 가능성을 본다면 카쉐어링 서비스에 대한 서비스품질과 소비자의 이용행태에 관한 연구는 그 의미가 크다고 볼 수 있다. 본 연구는 공유경제(sharing economy)부문의 대표 업태인 카쉐어링 서비스에 대한 전반적인 서비스평가에 관한 연구로 서비스품질 만족도, 서비스상품 만족도, 서비스체험 만족도의 세 부문을 가지고 종합만족도에 미치는 영향을 알아보고자 하였다. 각 부문의 차원이 서비스만족도에 미치는 영향력을 카쉐어링 브랜드별로 살펴보고 추가로 이용자의 성별과 이용목적을 구분하여 종합만족도에 미치는 영향력을 분석하였다. 분석결과 서비스품질만족도, 서비스상품만족도, 서비스체험 만족도가 종합 만족도에 미치는 영향은 유의하고, 서비스품질 만족도가 가장 큰 영향을 미치는 것으로 나타났다. 서비스품질 차원은 모든 차원에서 만족도에 영향을 미치는 것으로 나타났다. 서비스상품의 차원 중 차고지 접근성 및 차량정비가 만족도에 큰 영향을 미치는 것으로 나타났다. 마지막으로 서비스체험의 차원 중 긍정감정이 부정감정보다 만족도에 미치는 영향이 더 큰 것으로 나타났다. 이용자 성별에 따른 종합만족도에 미치는 영향력의 차이는 여성이 높게 나타났고 이용목적의 유형 중 여행, 데이트 및 친구만남의 목적으로 서비스를 이용할 때 만족도가 높게 나타나는 것으로 확인되었다. 또한 카쉐어링 서비스의 관리적 함의를 제시한다.

• 디지털융복합연구
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• 제17권6호
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• pp.247-255
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• 2019

본 연구는 만성 뇌졸중 환자에게 키네시오테이핑과 경피신경전기자극을 결합 적용하여 단일방법과 비교하기 위함이다. 본 연구는 뇌졸중환자 29명을 대상으로 테이핑군(10명), 경피신경전기자극군(10명), 테이핑과 경피신경전기자극 결합한 결합군(9명)으로 나누었다. 중재기간은 4주간 주 5회, 30분씩 실시하였다. 평가에는 Timed Up & Go(TUG)와 Berg balance Scale(BBS)를 이용하여 균형평가를 실시하였고 보행 평가는 Functional Gait Assessment(FGA)와 10-metre walk test를 이용하였다. 삶의 질 평가는 EuroQol-5 dimension (EQ-5D)를 이용하였다. 연구결과 세 군 모두에서 TUG, BBS, FGA, 10 meter walk test, EQ-5D에 유의한 개선이 나타났다(p<.05). 세 군간 중재효과 비교에서 결합군이 나머지 두 군보다 FGA에 유의한 증가를 보였다. 본 연구를 통해 경피신경전기자극과 테이핑 결합이 단일적용 보다 FGA에 더욱 효과적인 것을 알 수 있었다. 하지만 FGA를 제외하고 다른 변수간에 차이가 없었으므로 앞으로의 연구에서는 더 많은 대상자 수와 중재기간이 필요할 것으로 사료된다.

• 한국초등과학교육학회지:초등과학교육
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• 제43권2호
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• pp.337-352
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• 2024

본 연구는 참여와 실천의 차원을 위한 창의적 설계 기반 비형식 과학교육 프로그램을 개발하고 그 타당성과 효과성에 대하여 알아보는 데 목적이 있다. 프로그램의 개발은 참여와 실천의 지역화와 맥락화에 초점을 맞추어 주제를 선정하였고 연구 개발진의 반복적인 논의와 수정을 통해 최종적으로 '마션, 화성에서 살아남기', '선정릉이 있어 다행이다', '햇빛 레스토랑 설계하기'의 세 가지 프로젝트로 하였다. 프로그램은 총 42차시로 프로젝트 수행 이외에도 학습을 수행하면서 알게 된 내용을 자료로 정리하고 발표하는 발표회를 포함하여 개인적인 맥락화가 가능하도록 구성하였다. 개발된 프로그램의 적용은 5~6학년 학생 15명을 대상으로 하였으며, 효과성을 검증하기 위하여 참여와 실천 차원, 과학긍정경험은 전체 프로그램의 시작과 끝에 사전･사후 검사를 수행하였다. 또한 검사 문항 말미에 학생들의 소감이나 느낌을 자유롭게 적을 수 있는 자율 서술식 문항을 추가하여 학생들의 생각을 알아보았다. 효과성에 대한 적용 결과, 참여와 실천 차원의 안전 사회 기여에서 가장 높은 상승 폭을 보였으며 그 외의 다른 하위 구인도 상승한 것을 알 수 있었다. 과학긍정경험과 관련해서는 과학 관련 자아개념이 가장 높은 상승 폭을 보였고 다른 하위 구인도 참여와 실천 차원과 동일하게 모두 소폭 상승하였다.

• 한국운동역학회지
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• 제12권1호
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• pp.173-191
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• 2002

The purpose of this study was defined efficient throw motion pattern to obtain the quantitative data and to achieve successful bowling through kinetic - kinematic variables on the throw motion. Subject of group composed of three groups : Higher bowlers who are two representative bowlers with 200 average points and one pro-bowler. Middle bowlers who are three common persons with 170 average points. Lower bowler who are three common persons with 150 average points. Motion analysis on throw motion in three groups respectively has been made through three-dimension cinematography using DLT method. Two high-speed video camera at operating 180 frame per secondary. One-way ANOVA has been used to define variable relations. Analyzed result and conclusion are the following : The displacement of back of the hand must have wider difference of each right-left displacement to increase the spin of the ball. In high bowlers group, difference between the front-rear position of back of the hand in case of success and that in case of failure in follow throw is 0.17m. That is to say, momentum in case of success come to increase greatly, compared with that in case of failure. To increase the spin of the ball, the potential difference should be narrower in follow through. In case of the high bowlers, the velocity of the front-rear direction of the back of the hand has been the fastest both in release and follow through, compared with those in other groups, which has contributed to increasing the spin force of the ball. The orders in the resultant velocity of the back of the hand has shown the this : the finger tip$\rightarrow$the back of the hand$\rightarrow$wrist.These orders made the proximal segment support the distal segment. The distal segment has provided the condition to accelerate the velocity. In case of failure, the suddenly increased velocity has caused the failure in the follow through. Acutely flexing the angle of the back of the hand has contributed to lifting to increase the spin of the ball.

• 한국정보통신학회논문지
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• 제13권11호
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• pp.2373-2377
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• 2009

본 연구에서는 3차원 포아송방정식을 이용하여 FinFET의 문턱전압특성을 분석하였다. FinFET는 차세대 나노소자로서 단채널효과를 감소시킬 수 있다는 장점 때문에 많은 연구가 진행중에 있다. 이에 FinFET에서 단채널효과로서 잘 알려진 문턱 전압이하 스윙 및 문턱 전압 등을 3차원 포아송방정식의 분석학적 모델로 분석하고자 한다. 나노소자인 FinFET의 구조적 특성을 고찰하기 위하여 채널의 두께, 길이, 폭 등의 크기요소에 따라 분석하였다. 본 논문에서 사용한 분석학적 3차원 포아송방정식의 포텐셜모델 및 전송모델은 여러 논문에서 3차원 수치해석학적 값과 비교하여 그 타당성이 입증되었으므로 이 모델을 이용하여 FinFET의 문턱전압특성 및 문턱전압이하 특성을 분석하였다.