• The Journal of Advanced Prosthodontics
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• 제15권2호
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• pp.63-71
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• 2023

PURPOSE. The aim of this study was to assess the effect of hemispherical dimple structures on the retention of cobalt-chromium (Co-Cr) crowns cemented to titanium abutments, with different heights and numbers of dimples on the axial walls. MATERIALS AND METHODS. 3.0-mm and 6.0-mm abutments (N = 180) and Co-Cr crowns were prepared. The experimental groups were divided into two and four dimple groups. The crowns were cemented by TempBond and PANAVIA F 2.0 cements. The retention forces were measured after thermal treatments. A two-way Analysis of Variance (ANOVA) and post-hoc Tukey HSD test were conducted to analyze change in retention forces by use of dimples between groups, as well as t test for the effect of abutment height change (α = .05). RESULTS. Results of the two-way ANOVA showed a statistically significant difference in retention force due to the use of dimples, regardless of the types of cements used (P < .001). A significantly higher mean retention forces were observed in the groups with dimples than in the control group, using the post hoc Tukey HSD test (P < .001). Results of t test displayed a statistically significant increase in the retention force with 6.0-mm abutments compared with 3.0-mm abutments (P < .001). The groups without dimples revealed adhesive failure of cements, while the groups with dimples showed mixed failure of cements. CONCLUSION. Use of hemispherical dimples was effective for increasing retention forces of cemented crowns.

• 한국운동역학회지
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• 제31권2호
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• pp.119-125
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• 2021

Objective: The purpose of this study was to identify the effect of dynamic postural balance control against tilting platform between golfers and non-golfers. Method: 24 golfers and 26 non-golfers were participated. Eight motion capture cameras, two force plates, and one dynamic balance control platform were used for sensory perception test. It was performed two-way repeated ANOVA with a Bonferroni adjustment at a significant level of a 0.05. Results: Golfers' perception ability was higher than non-golfer according to slope. the CoP, time, angle variables were indicated main effect and interaction effect between golfer and non-golfer. Conclusion: It was known that golfer's proprioception perception ability was higher than non-golfers. Repeated practice such as shots and putting on the uneven ground might improve their balance control.

• 전기학회논문지
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• 제62권12호
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• pp.1712-1718
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• 2013

This paper proposes a compact dual-band 3-way power divider that helps lowering the weight of a transceiver for the L-band or multi-purpose satellite communication. Instead of the multi stages or tapering which ends up with loss accumulation and size-growth, the non-linear dispersive phases from the metamaterial CRLH(composite right and left-handed) properties are obtained by the accurate formulation and implemented by the short transmission line segments. Firstly, the CRLH dual-band two-way unequal power divider and equal power divider are separately designed. And then, the input of the two-way equal power divider is plugged in the output port of the unequal one, and the entire geometry is slightly adjusted for the desirable performance. The circuit analysis and full-wave simulation are used to predict the frequency responses and validated by the measurement of the prototype. Besides, the size-reduction effect is addressed.

• 한국항행학회논문지
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• 제16권5호
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• pp.846-852
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• 2012

영상분할 결과는 알고리즘에 관련된 매개변수들에 따라 다르기 때문에 최적 분할을 위하여 시행 착오법이 많이 이용된다. 본 논문에서는 3차원 변량 분석법을 이용하여 영역기반 active contour 방법에 관련된 최적 매개변수들을 결정하는 방법을 제안한다. 3원 변량 분석법에 의해서 추출된 결과와 사용자가 영상에서 직접 그린 결과가 상호 비교된다. 마지막으로 각 매개변수들의 주요 효과와 상호작용 효과를 측정하고 최적 값을 추출하기 위하여 점 추정 및 구간 추정 값을 계산한다. 본 논문에서 제안한 방법은 구간 상수 모델을 대상으로 영상분할시 최적 매개변수들을 추출하는데 큰 도움을 줄 것이다.

• 전자공학회논문지CI
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• 제37권2호
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• pp.1-10
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• 2000

기존의 syntax 위주의 직력성 이론만 가지고서는 거래의 실행시간상 차별화 특성을 수용하면서 다수의 거래에 대한 단위시간당 처리 생산성을 높이기는 힘든 형편이다. 이러한 상황을 해결하기 위하여 이타적 잠금기법(altruistic locking ：AL)은 거래가 객체를 사용한 다음 더 이상 그 객체를 요구하지 않을 때 다른 거래들이 그 객체를 로크할 수 있도록 미리 객체에 대한 로크를 해제함으로써 거래들의 대기시간을 줄이기 위한 취지에서 제안된 것이다. 확장형 이타적 잠금(extended altruistic locking ：XAL)기법은 AL을 자취의 확장 측면에서 개선한 잠금기법으로서 AL이 근본적으로 안고 있는 반드시 기부된 객체만을 처리해야 한다는 부담을 보다 완화한 기법이다. 본 논문에서는 우선 장기거래로 인한 단기거래의 장기적 대기현상 완화 측면에서의 AL과 XAL의 공통적 한계점을 분석하였다. Client-server 환경하에서 장기거래로 인한 단기거래의 장기적 대기현상을 최소화하도록 줄임으로써 작업처리율을 높이는 반면, 거래간의 평균 대기시간을 줄일수 있는 새로운 확장형 이타적 잠금기법인 전후진방식의 신형 확장 기법인 2DL(two-way donation locking)을 제안하였다. 모의실험에 의한 성능평가 결과 장기거래의 길이가 5이상, 9이하인 상황에서 2DL은 2PL 보다 작업 처리율과 거래의 평균 대기시간 면에서 우수한 결과를 나타내었다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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• pp.234.2-234.2
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• 2015

Recently, the electromagnetically-induced transparency (EIT)-like effect in metamaterials has attracted enormous interest. Metamaterial analogs of EIT enable promising applications in slow-light devices, low-loss metamaterial, quantum optics, and novel sensors. In this work, we experimentally and numerically studied a bilayer metamaterial for controllable EIT-like spectral response at microwave frequencies. Bilayer metamaterial consists of two snake-shape resonators (SSRs) with one and two bars. The transmission spectra were measured in a frequency range of 4 - 8 GHz in an anechoic chamber at normal incidence. It is found that two SSRs in the metamaterial are activated in bright modes, and the coupling between two bright modes leads to the EIT-like effect, which results in the enhanced transmission at 5.61 GHz. Furthermore, we confirm that the EIT-like feature could be controlled by adjusting the geometric parameters of metamaterial structure. Our work provides a way to tunable EIT-like effect and various potential applications including filters, sensors, and other microwave devices.

• 간호행정학회지
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• 제5권3호
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• pp.463-475
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• 1999

This study investigated the relationship between nurses' Career Commitment and Organizational Commitment, and the moderating effect of individual career-related characteristics (age, tenure, position, number of department change, number of hospital change) on the relationship between career commitment and organizational commitment. The sample for this study consisted of 594 nurses from 8 large Korean hospitals. And the factor analysis, Cronbach's alpha, multiple regression analysis and two-way ANOVA were used for the statistical methods. Research was found that (1) career commitment and the two dimensions of organizational commitment(affective and transactional) were validated as distinct concepts for Korean nurses. (2) career commitment showed positive influence on the two dimension of organizational commitment, (3) all individual career-related characteristics did not moderated the effect of career commitment on affective commitment, but (4) number of career department change and of hospital change among career-related characteristics moderated the effect of career commitment on transactional commitment. Theoretical and practical implication of these result were discussed in the conclusion.

• 한국콘텐츠학회논문지
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• 제13권5호
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• pp.377-386
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• 2013

본 연구의 목적은 우리나라 제조 기업을 대상으로 기업조직의 재무성과에 유의적인 영향을 미치기 위해 CEO특성, 경영혁신, 경영통제시스템 간에 어떠한 적합성이 존재해야하며, 그리고 구체적으로 해당 변수들 간에 어떠한 인과관계가 존재하는지를 규명하고자 한다. CEO특성에는 위험감수성향, 성취동기로 측정하였고, 경영혁신은 제품혁신과 기술혁신으로 구분하였고, 경영통제시스템은 결과통제와 행동통제로 구분하여 측정하였다. 본 연구의 목적을 위해 상관관계분석, 다중회귀분석을 적용하여 적합성을 확인하고, 이 적합성이 재무성과에 유의적인 영향을 미치는 가를 실증 분석하였다. 적합성은 Ven de Ven and Drazin(1985)의 연구에서 적용한 세 가지 적합성(선택적 접근법, 상호작용 접근법, 시스템 접근법)을 적용하여 분석하였다. 그리고 세변수간의 상호작용 항이 재무성과에 유의적이 영향을 미치는 경우에 이들 간의 구체적인 인과관계를 파악하기 위해 경로분석을 이용하여 추가분석을 실시하였다

• 한국노년학
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• 제39권4호
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• pp.847-859
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• 2019

본 연구는 노인의 가구 소득 수준과 우울증상의 관계에서 나이아신(Niacin)의 조절효과를 증명하는데 목적을 두고 있다. 연구 방법은 보건복지부에서 실시한 2016년 국민건강영양조사 자료에 포함된 65세 이상 노인 총 1,632명을 대상으로 연구를 진행하였다. 통계 분석 방법은 가중치를 적용 후, SPSS 24.0을 이용하여 Two-way ANCOVA를 실시하였다. 연구결과, 가구 소득 수준이 낮을수록 우울증상이 상대적으로 높은 것으로 나타났고 나이아신(Niacin) 섭취량 역시 부족한 것으로 나타났다. 또한 가구소득 수준과 우울증상의 관계에서 나이아신(Niacin)의 조절효과가 있는 것으로 확인되었다. 따라서 노인의 가구소득 수준에 따른 우울증상의 차이를 줄이고, 노년기 정신건강 향상을 위해 나이아신(Niacin)과 같은 영양소 섭취의 중재전략의 필요성을 강조한다.

• 동의생리병리학회지
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• 제22권4호
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• pp.918-929
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• 2008

This study investigated the effects of inverted position on EEG and heart rate variability before and after Bang song gong. BSG is a training method using in qi-gong and meditation to give a convergence of consciousness on body segments in order and take a silent speech of 'song'. The subjects were the 14 university students(n=7 per group) who had not experienced any medical problem and had not practiced BSG. They took a practice of the two way of BSG training program for 30 minutes every other day for two weeks. During practicing BSG, A group took sitting position and lean sitting position by turns, B group took inverted and lean sitting position in the same way. Statistical analysis conducted by two-way ANOVA($2groups^{\ast}2periods$) with p<0.05 for average difference of EEG and HR according to position change in each group before and after BSG. In A group, EEG and HR were changeless irrespective of the change of position and BSG. On the other hand, in B group, significant changes were observed in EEG(p<0.05). ${\alpha}$ wave of inverted position were on the increase, ${\beta}$ and ${\delta}$ wave of inverted position showed smaller power after two weeks training. In the variation of HR, there were smaller variation according to the position change after BSG compared to before BSG(p<0.05). The results suggested that an inverted position may make the depth of meditation deeper, and is likely to be effective for decreasing tension of brain and the sleepiness during qi-gong training. In addition to, an inverted position seemed to promote control of blood pressure of brain. So the application of an inverted position to 'BSG' will be very helpful to achieve deeper relaxation and to obtain the desired effect from qi-gong training.