• 반도체디스플레이기술학회지
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• 제10권1호
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• pp.33-41
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• 2011

Due to the recent quantum leaps forward in bio-, nano-, and information-technologies (BT, NT and IT), the precisionization and miniaturization of mechanical and electrical components are in high demand. In particular, the ITrelated equipments that take a great part in our domestic industry are in the area requiring high precision technologies. As a consequence, the researches on the development vibration isolation systems that diminish external disturbance or internal vibration are highly required. Among the components comprising the vibration isolation system, air spring has become on a focal point for the researchers due to its merits. This air spring is able to support heavy loads, keep a low natural frequency despite of having a lower value of stiffness, and control the performance of vibration isolation. However, sometimes the sole use of air spring is in demand due to some economic reasons. Under this circumstance, the damping effect of sole air spring may not enough to reduce sufficient amount of vibration. In this study, the air spring mount system connecting with an external chamber is proposed to increase or control the damping effect. To investigate its damping mechanism, the thermal and dynamic behaviors of the system is examined through a theoretical modeling approach in this part of research. In this approach, thermomechanical and Helmholtz resonator type models are to be employed for the air spring/external chambers and connecting tube system, respectively. The frequency response functions (FRFs) derived from the modeling effort are evaluated with physical parametric values and the effects of connecting tube length on these FRFs are identified through computer simulations.

• 무역학회지
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• 제48권2호
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• pp.1-26
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• 2023

본 연구는 자회사가 현지시장 적응과 시장변화에 대한 대응으로서 내부능력의 재조정을 실시하며, 나아가 조직 내·외부의 네트워크를 활용하는 것이 투자성과에 어떠한 영향을 미치는 실증하는데 연구목적을 둔다. 실증결과로부터 자회사의 내부능력 조정 크기가 클수록, 이를 신속하고 유연적으로 실행할수록 투자성과에 긍정적 효과가 발생함을 입증하였다. 이 과정에서 네트워크 내부배태성의 활용과, 네트워크 외부배태성의 활용이 투자성과에 긍정적 매개자로서 역할을 하는 것도 입증하였다. 또한 중국시장에 진출한 다국적제조기업에게는 외부배태성의 매개효과의 크기가 내부배태성의 매개효과 크기보다 더 클 것이라는 연구가설에 대해 통계분석 결과가 지지하는 것으로 나타났다. 이러한 분석결과는 자회사 최고경영자에게는 현지 정보의 탐색과 접근, 현지 제도에 적응 등 외국비용 절감 전략을 수립하는 것과 함께 자회사가 현지에서 새로운 지리적 경쟁우위를 창출하는 데 외부배태성을 적극적으로 활용해야 한다는 시사점을 제공한다.

• 대한지역사회영양학회지
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• 제29권2호
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• pp.114-128
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• 2024

Objectives: The purpose of this study was to investigate the perception of nutrition teachers and the factors influencing their intention toward sustainable dietary education utilizing the theory of planned behavior (TPB). Methods: The self-administered online survey was completed by nutrition teachers in Jeollanam-do, South Korea. A total of 151 valid questionnaires were analyzed. Factor analysis and multiple regressions were employed to test the research model. Results: The study findings demonstrated that all TPB variables significantly influenced the sustainable dietary educational intention, with the degree of influence ranking as follows: external perceived behavioral control (β = 0.417), attitude (β = 0.240), internal perceived behavioral control (β = 0.207), and subjective norms (β = 0.181). For external perceived behavioral control, nutrition teachers and elementary schools exhibited higher levels compared to dietitians and middle/high schools, respectively. The participants in sustainable dietary education training programs exhibited a higher level of internal perceived behavioral control compared to those who did not participate. The highest perception levels were reported for attitude (4.26), followed by subjective norms (4.02), internal perceived behavioral control (3.67), and external perceived behavioral control (3.20). Conclusions: This study affirmed that the TPB variables elucidated the sustainable dietary educational intentions of nutrition teachers. The significant impacts of external and internal perceived behavioral control, attitude, and subjective norms on educational intentions were confirmed. Consequently, proactive support from schools and governments is essential to enhance the facilitating factors and mitigate the barriers toward sustainable dietary education in schools.

• 대한통합의학회지
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• 제9권4호
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• pp.183-190
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• 2021

Purpose : The purpose of this study was to investigate the effect of side planks on the muscle thickness of the core muscles, external oblique, internal oblique, and transverse abdominis, and this study was conducted to compare whether side plank exercise according to the application of various unstable support surfaces increases the thickness by activating the action of the muscles. Methods : The subjects of this study were 30 healthy adults and were randomly and equally assigned to three groups by a random number table. All subjects were divided into three groups according to the application of an unstable support surface during the side plank(Group A = stable support, Group B = one unstable support, Group C = two unstable supports). The side plank exercise was performed 30 minutes a day, 3 times a week for a total of 4 weeks. The muscle thickness of the core muscle was measured before the intervention, 2 weeks, 4 weeks, and 3 times in total. All measured data were comparatively analyzed by repeated measures ANOVA and one-way ANOVA. The statistical significance level was set to .05. Results : The results of this study were as follows : 1. All muscles showed an interaction between training period and group. 2. There was a significant difference between the groups at the 2 weeks and 4 weeks of the internal oblique and transverse abdominis muscle measurements. Conclusion : The thickness of the abdominal muscle increased during the side plank exercise according to the support surface, and the thickness of the abdominal muscle increased the most during the side plank exercise on the unstable support surface. Therefore, it is thought that the addition of an unstable support surface will provide a more effective therapeutic effect on the thickness change of the abdominal muscle during side plank exercise.

• 대한물리의학회지
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• 제11권3호
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• pp.97-104
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• 2016

PURPOSE: Bridge exercise is widely used in rehabilitation exercise for trunk stabilization through various applications in clinical practice. However, there is a lack of studies changing the base of support for the shoulders. The purpose of this study is to investigate the changes in the base of support for the shoulders of trunk muscle activation during bridge exercise. METHODS: 20 healthy subjects (10 men, 10 women) in their twenties were participated in this study. They performed 5 bridge exercises (bridge exercise with their shoulders on a stable table (1/2 knee height, knee height), and on a sling (1/2 knee height, knee height), conventional bridge exercise. The surface electromyography were used for rectus abdominis (RA), internal oblique (IO), external oblique (EO), and erector spinae (ES). RESULTS: During bridge exercise that their shoulders on the sling of 1/2 knee height, the RA, EO, IO muscle activities were significant increased. And during bridge exercise that their shoulders on the stable surface of knee height, the IO/RA ratio were higher than other positions but there were no significant difference between positions for EO/RA, IO/RA ratio. CONCLUSION: Based on this result, using various bases of support and changing the height of bridging exercise may be used to provide effective trunk stabilization exercises.

• 한국강구조학회 논문집
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• 제17권2호통권75호
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• pp.183-194
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• 2005

기존의 연속 프리플렉스 거더교는 내측지점부 바닥판 콘크리트에 압축력을 도입시키기 위해 내측지점을 상승시키고 부모멘트 구간만큼의 바닥판 콘크리트를 타설하고 하강시키는 시공법을 사용하였다. 그러나 상기의 시공법은 장시간의 내측지점 상승 작업과 종곡선의 굴곡 문제 등 여러 가지 시공상 문제점을 가지고 있다. 따라서 본 논문은 이러한 문제점을 해소하기 위해 내측지점 및 외측지점을 하강시키는 공정만을 이용한 개선된 연속 프리플렉스 합성형 거더교의 시공법을 제시하였으며, 특정화된 연속 프리플렉스 거더교의 설계 프로그램에만 의존하지 않고 프리플렉스 거더교의 단면을 쉽게 추정할 수 있는 체계화된 설계식을 제시하였다.

• Journal of Information Technology Applications and Management
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• 제22권1호
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• pp.153-163
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• 2015

The purpose of this study is to investigate the relationship among factors that expand the win-win growth between domestic finished goods-making manufacturers and subcontractors. One-hundred twenty six firms participated for this study and were used for the data analysis. As a result of analysis, first, it was found that the win-win growth between first-tier suppliers and second-tier suppliers has positive effects on the win-win growth made by second-tier suppliers helping the third-tier suppliers. Second, it was found that the win-win growth policies supported by the government for the positive relationship between first-tier suppliers and second-tier suppliers for the finished goods-making manufacturers have positive effects on the win-win growth between second-tier suppliers and third-tier suppliers. Third, the results also showed that the win-win growth between second-tier suppliers and third-tier suppliers has a positive influence both on the financial and on the non-financial performances of the second-tier suppliers. Based on the results of this study, it is recommended to (1) construct infrastructure by sector through partnership between finished goods-making manufacturers and subcontractors, (2) draw in active support through the governmental win-win growth policies, (3) induce increasing productivities through information sharing, manpower support, technical support and educational support, and (4) strengthen and cultivate the culture of the small- and medium-sized companies.

• 아동학회지
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• 제28권5호
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• pp.221-232
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• 2007

The purpose of this study was to investigate the relationship among personal attributions of daycare center teachers in fields, social support, and teachers' burn-out. Data were collected by 228 teachers in day care center. To examine the relationship among personal attributions of daycare center teachers in fields, social support, and teachers' burn-out, it was used the scale of 'the tendency of attributions', 'social supports', and 'burn-out'. To analyze data, Pearsons' correlation and multiple regression were used. The results of this study were as followed. First, the score of daycare center teachers' personal attributions, social support, and teachers' burn-out were higher than the mean score. Second, internal and external variables were related to burn-out factors. Third, attribute disposition were related to teachers' burn-out. As a whole, teachers were tend to be in internal attributions, which led to a tendency to show positive reactions against burn-out. Forth, social supports were related to teachers' burn-out.

• Nuclear Engineering and Technology
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• 제51권5호
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• pp.1297-1306
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• 2019

Probabilistic safety assessments (PSA) have been used for several decades to visualize the risk level of commercial nuclear power plants (NPPs). Since the role of a human reliability analysis (HRA) is to provide human error probabilities for safety critical tasks to support PSA, PSA quality is strongly affected by HRA quality. Therefore, it is important to understand the underlying limitations or problems of HRA techniques. For this reason, this study conducted a survey among 14 subject matter experts who represent the HRA community of domestic Korean NPPs. As a result, five significant HRA issues were identified: (1) providing a technical basis for the K-HRA (Korean HRA) method, and developing dedicated HRA methods applicable to (2) diverse external events to support Level 1 PSA, (3) digital environments, (4) mobile equipment, and (5) severe accident management guideline tasks to support Level 2 PSA. In addition, an HRA method to support multi-unit PSA was emphasized because it plays an important role in the evaluation of site risk, which is one of the hottest current issues. It is believed that creating such a catalog of prioritized issues will be a good indication of research direction to improve HRA and therefore PSA quality.

• 유통과학연구
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• 제20권12호
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• pp.99-108
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• 2022

Purpose: This study attempted to identify determinants affecting research collaboration and R&D distribution activities, especially regarding facility and equipment leasing of small and medium enterprises (SMEs) in South Korea. The objective of this study was to find the most significant firm characteristics that affect firms participating in an R&D collaboration and distribution program and investing in R&D in terms of leasing payment for equipment. Research design, data, and methodology: This study analyzes which SMEs' characteristics influence external research cooperation activities by examining the SMEs that received government support for equipment leasing using multiple regression analysis and residual plots. The survey combined two databases: 1) a fact-finding survey of participating firms by the Ministry of SMEs and Startups, and 2) leasing information by the Korea Association of University, Research Institute and Industry. Results: The study found that firm size positively impacts R&D investment, R&D collaboration and distribution. Conclusions: The study provided evidence to policymakers and government officials that firms with more employees will more likely participate in government support programs. The study results also prove that government officials believe firm location does not impact R&D investment, R&D collaboration and distribution.