• 한국구조물진단유지관리공학회 논문집
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• 제24권1호
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• pp.116-124
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• 2020

코어 위치변화에 따른 횡력저항성능 분석을 위하여, 대칭 평면형 20층 건물을 대상으로 3차원 구조해석을 수행하였다. 중심 코어, 1축 편심 코어, 2축 편심 코어로 구분하여 4가지 해석모델을 구성하고, 고유치해석, 풍하중 해석, 지진하중 해석을 수행하였다. 중심 코어 건물에서는 비틀림이 발생하지 않았으나, 편심 코어의 배치에 따라 휨과 비틀림이 복합적으로 발생하였으며 횡력저항성능이 저하되었다. 코어의 편심 배치에 따른 풍하중 크기의 변화는 작으나, 최대 횡변위는 코어의 편심 배치에 의하여 크게 증가하는 것으로 확인되었다. 또한, 편심 코어의 경우 횡방향 강성의 저하로 인하여 중심 코어에 비해 지진하중이 다소 감소하였으나, 비틀림의 영향으로 최대 층간변위비는 크게 증가하는 것으로 확인되었다. 이러한 결과들을 바탕으로 코어의 위치에 따른 구조거동을 확인하고, 계획 및 설계 단계에서 코어 배치의 가이드라인으로 활용할 수 있다.

• 한국콘텐츠학회논문지
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• 제15권8호
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• pp.209-217
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• 2015

본 연구는 지방공무원들의 핵심자기평가가 직무열의와 고객지향성에 미치는 영향을 경험적으로 파악하여 정책적 시사점을 도출할 목적으로 수행되었다. 그동안 고객지향 행정서비스 제공하기 위한 다양한 제도적 방법이 도입되어 왔지만 만족할 만한 얻지 못했다. 제도적 접근만으로는 관료들이 직무수행 행태를 고객지향적 행동으로 바꾸는데 한계가 있기 때문이다. 공무원들의 서비스 공급자 중심의 역할인식과 직무수행방식을 수요자 중심으로 바뀌는 데는 다양한 접근이 필요한 것이다. 이론적 관점에서 볼 때 핵심자기평가는 조직심리학에서 나온 개념으로 조직구성원이 자신의 업무수행 능력이나 외부환경 대처 역량에 대한 잠재의식적 평가로 조직구성원의 직무열의에 긍정적 영향을 미치는 요인으로 알려져 있다. 심리적 개념인 핵심 자기평가와 고객지향성이라는 직무수행 태도와 이론적 차원의 관련성도 의의가 있다. 본 연구의 분석 결과 핵심자기평가가 공무원의 고객지향성에 긍정적으로 영향을 미치는 것으로 확인되었으며 직무열의가 매개적 역할을 수행하고 있음도 제시하였다. 행정서비스의 고객지향성을 강화하기 위해서는 제도적 통제와는 별도로 자신감과 외적 환경 변화 대응능력을 높이는 교육훈련을 강화하는 정책적 접근을 제안하였다.

• 디지털융복합연구
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• 제15권6호
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• pp.97-105
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• 2017

본 연구에서는 교수의 핵심역량과 대학생의 인지역량 및 생애역량의 구조적 분석을 위해 전국 7개 대학의 대학생 500명을 대상으로 빈도분석, 기술통계분석, 신뢰도 분석, 상관분석과 확인적 요인분석, 구조방정식모형 분석을 실시하였다. 연구결과, 교수의 핵심역량은 대학생의 생애역량에 유의한 영향을 미치는 것을 알 수 있었으며, 교수의 핵심역량은 대학생의 인지역량에 유의한 영향을 미치는 것을 알 수 있었다. 또한 대학생의 인지역량은 생애역량에 유의한 영향을 미치는 것을 알 수 있었으며, 대학생의 인지역량은 교수의 핵심역량과 대학생의 생애역량 사이에서 유의한 매개효과가 있음을 확인할 수 있었다. 이는 교수의 핵심역량이 대학생의 인지역량을 기반으로 생애역량에 더 많은 영향을 준다고 할 수 있다.

• The Journal of Advanced Prosthodontics
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• 제5권3호
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• pp.319-325
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• 2013

PURPOSE. The objective of this study was to determine the effect of the color of a background substructure on the overall color of a zirconia-based all-ceramic crown. MATERIALS AND METHODS. Twenty one posterior zirconia crowns were made for twenty subjects. Seven premolar crowns and six molar crowns were cemented onto abutments with metal post and core in the first and second group. In the third group, eight molar crowns were cemented onto abutments with a prefabricated post and composite core build-up. The color measurements of all-ceramic crowns were made before try-in, before and after cementation. A repeated measure ANOVA was used for a statistical analysis of a color change of all-ceramic crowns at ${\alpha}$=.05. Twenty four zirconia specimens, with different core thicknesses (0.4-1 mm) were also prepared to obtain the contrast ratio of zirconia materials after veneering. RESULTS. $L^*$, $a^*$, and $b^*$ values of all-ceramic crowns cemented either on a metal cast post and core or on a prefabricated post did not show significant changes (P>.05). However, the slight color changes of zirconia crowns were detected and represented by ${\Delta}E{^*}_{ab}$ values, ranging from 1.2 to 3.1. The contrast ratios of zirconia specimens were 0.92-0.95 after veneering. CONCLUSION. No significant differences were observed between the $L^*$, $a^*$, and $b^*$ values of zirconia crowns cemented either on a metal cast post and core or a prefabricated post and composite core. However, the color of a background substructure could affect the overall color of posterior zirconia restorations with clinically recommended core thickness according to ${\Delta}E{^*}_{ab}$ values.

• 대한치과기공학회지
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• 제32권4호
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• pp.327-335
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• 2010

Purpose: The purpose of this study was to investigate the correlation between zirconia core thickness and color tone blocking of discolored tooth and metal post. Methods: For this study, we made 20-porcelain sample and 4-metal sample( liechtenstein IPS e.max) bonded to zirconia core of different thickness with cement(Relyx ARC-3M USA)for produce discolored. We measured the color-spectral characteristics, using Shadepilot equipment(Degudent USA).We measured it with Shadepilot equipment set by automated average mode in 3 times And applied the average value obtained from 2 times of measurement in the middle of each sample. Results: As a result of analysing color-spectral characteristics on zirconia core sample, Depending on the thickness of zirconia core, the value of brightness(${\Delta}L*$:color-spectral characteristic) was increased within limited range, value of ${\Delta}a*$, ${\Delta}b*$ was decrease. Conclusion: Consequently, we obtained the following results: Changes of sample color were observed depending on the thickness of zirconia, but the range of change did not exceed the scope range of shade guide. The case of metal posts, shade guide color D2 were observed in 0.5mm of zirconia core thickness. As a result, in case of porcelain, increasing the zirconia thickness of 0.3mm or more is unnecessary for color blocking effect, in case of metal post, considering the discolored tooth, thickness of zirconia with at least 0.5mm or more is recommended.

• 대한통합의학회지
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• 제10권4호
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• pp.93-102
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• 2022

Purpose : The purpose of this study was to analyze the change in thickness of transvers abdominis, internal oblique, and external oblique when virtual reality based ring fit adventure is applied to young adults in order to investigate the effect of ring fit adventure on core stabilization. Methods : 30 subjects participated in the experiment. Subjects were randomly assigned to two groups. 15 subjects performed ring fit adventure core exercise (experimental group) and 15 subjects bridge and dead bug exercise (control group). The ring fit adventure core exercise program consists of 6 types, 1) bow pull, 2) overhead lunge twist, 3) pendulum bend, 4) seated ring raise, 5) plank, 6) warrior III pose. Each exercise was performed for 5 minutes, for a total of 30 minutes. The bridege and dead bug exercise were performed for 15 minutes each for a total of 30 minutes. All interventions were performed 3 times a week for 4 weeks. Thickness of the abdominal muscles was measured with a ultrasound. The paired t-test was used to compare the thickness of the transverse abdominis, internal oblique, and external oblique before and after intervention, and the comparison between groups was analyzed using the independent t-test. Results : As a result, in the experimental group, thickness of transverse abdominis and internal oblique increased significantly (p<.05), but external oblique decreased significantly (p<.05), and in the control group, thickness of transverse abdominis, internal oblique, and external oblique increased significantly (p<.05). There was a significant difference in external oblique in the difference between groups (p<.05). Conclusion : These study results showed that core exercise using ring fit adventure can reduce external oblique and increased selective muscle activity of transverse abdominis and internal oblique of the deep abdominal muscles, so it is meaningful as an effective intervention for core stabilization.

• Transactions on Electrical and Electronic Materials
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• 제18권2호
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• pp.97-102
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• 2017

A current transformer (CT) is a type of sensor that consists of a combination of electric and magnetic circuits, and it measures large ac currents. When a large amount of current flows into the primary winding, the alternating magnetic flux in the iron core induces an electromotive force in the secondary winding. The characteristics of a CT are determined by the iron core design because the iron core is saturated above a certain magnetic flux density. In particular, when a large current, such as a current surge, is input into a CT, the iron core becomes saturated and the induced electromotive force in the secondary winding fluctuates severely. Under these conditions, the CT no longer functions as a sensor. In this study, the characteristics of the secondary winding were investigated using the time-difference finite element method when a current surge was provided as an input. The CT was modeled as a two-dimensional analysis object using constraints, and the saturation characteristics of the iron core were evaluated using the Newton-Rhapson method. The results of the calculation were compared with the experimental data. The results of this study will prove useful in the designs of the iron core and the windings of CTs.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 춘계학술대회 논문집
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• pp.47-47
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• 2009

The formation of variable one-dimensional structures including core/shell structure is of particular significance with respect to potential applications for thermoelectric devices with the enhanced figure of merit ($ZT=S2{\sigma}T/{\kappa}$). We report the fabrication of Bi-Te core/shell nanowire based on a novel stress induced method. Fig. 1 schematically shows the nanowire fabrication process. Bi nanowires are grown on the Si substrate by the stress-induced method, and then Te is evaporated on the Bi nanowires. Fig. 2 is a transmission electron microscopy image clearly showing a core/shell structure for which effective phonon scattering and quantum confinement effect are expected. Electrical conductivity of the core/shell nanowire was measured at the temperatures from 4K to 300K, respectively. Our results demonstrate that Bi-Te core/shell nanowire can be grown successfully by the stress-induced method. Based on the result of electrical transport measurement and characteristic morphology of rough surface, Seebeck coefficient and thermal conductivity of Bi-Te core/shell nanowires are presented.

• 국제물리치료학회지
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• 제10권1호
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• pp.1717-1724
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• 2019

Background : Several studies have suggested different arguments for the effect of stretching exercises and core muscle exercises on flexibility and balance ability. Objective : To determine the effects of stretching exercises and core muscle exercise on flexibility and balance ability. Design : Quasi experimental research Method : The study applied exercise interventions (three sessions per week for 6 weeks) on 40 subjects. The subjects were divided into stretching and core muscle exerciseing groups to identify the change of flexibility and balance ability. Sit- and- reach test results and hip hyperextension were measured for identifying changes in flexibility, and the Romberg test and Pedalo stabilizer were used for changes in balance ability. Results : Both the stretching exercise and core muscle exercise groups showed a statistically significant increase in flexibility (p<.05). However, the stretching exercise group showed a statistically significant increase in balance ability (p<.05), whereas the core muscle exercise group showed partially statistically significant differences in this par t(p>.05). In the analysis of the differences in the amount of change in flexibility, based on the types of exercise, stretching exercises showed a significant difference (p<.05), whereas a significant difference was not found in the amount of change in balance ability (p>.05). Conclusions : These findings indicate that stretching exercises are the more effective intervention for improving and maintaining flexibility, whereas there is no difference between stretching and core muscle exercises with respect to improving balance ability.

• 경영과정보연구
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• 제32권3호
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• pp.153-172
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• 2013

대부분의 중소기업은 대기업에 비해 인적 자원과 물적 자원의 제한이 더 크다고 할 수 있고, 처해 있는 경영환경은 더 위험하고 복잡하고 동태적이라고 할 수 있다. 따라서 중소기업의 생존과 발전에 있어서 인적 자원의 지식과 기술이 매우 중요하고, 이에 중소기업의 인적자원 관리에 대한 연구의 필요성이 있다. 특히, 중소기업의 핵심인재에 대한 우대정책과 관리제도가 인적자원의 경쟁력과 조직몰입에 어떠한 영향을 미치는지에 관한 연구는 매우 미흡하고 이론 및 실무적 시사점 또한 제한적이었다. 본 연구는 216개의 중소기업을 대상으로 890명의 종업원을 표본으로 하여 핵심인재우대정책과 핵심인재관리제도가 인적자원의 경쟁력과 조직몰입에 미치는 영향력을 검증하였다. 분석자료로는 한국직업능력개발원이 개발한 인적자본기업 패널의 2009년 자료를 활용하였다. 연구결과로는 중소기업의 핵심인재우대정책이 인적자원의 경쟁력에 긍정적인 영향을 미치고 있었고, 인적자원 경쟁력이 조직몰입에 긍정적인 영향력을 미치고 있었다. 하지만 중소기업의 핵심인재우대정책이 핵심인재관리제도에는 유의미한 영향을 미치고 있지 않았고, 핵심인재관리제도도 인적자원 경쟁력에 유의미한 영향력을 나타내고 있지 않았다. 이러한 연구결과가 중소기업에 있어서 인적자원의 경쟁력을 향상시키는데 핵심인재우대정책에 대한 중요성을 제고시키며, 중소기업의 핵심인재관리제도에 관한 관심도를 제고시키는 시사점을 제공한다.