• Proceedings of the Korea Water Resources Association Conference
• /
• 2019.05a
• /
• pp.308-308
• /
• 2019

지구상 해양, 대기 및 대륙 상호간의 연속적인 물의 거동을 나타내는 물의 순환의 주요 과정 중 하나인 유량 자료는 경년부터 수십년간의 다양한 기상학적 변동성을 내포하며 해당 지역의 수문기상학적 특성을 반영한다. 이러한 기상학적 변동성 중에서 비교적 긴 시간 주기를 나타내는 저주파 진동은 전지구적 기후변화의 장기적 영향을 나타내며 해수면 상승, 홍수 또는 가뭄과 같은 극한 수문사상을 나타내는 매우 주요한 지표로 활용되고 있지만 관측된 수문 시계열의 짧은 자료길이로 인하여 통계적 분석의 신뢰성에 한계를 보여왔다. 따라서 과거 수문 시계열의 확장으로 인하여 부재의 영역으로 남아있던 자료 기간의 한계가 보완되면 보다 정확하고 신뢰도 있는 분석이 가능할 것이다. 나무나이테를 활용한 고기후 복원 등의 연구가 증가하고 있지만 공학 분야에서 이를 실제로 활용한 연구는 아직 미비하다. 따라서 본 연구에서는 과거 기후의 정보를 바탕으로 복원된 수문 시계열을 활용하여 수문 시계열에 내재된 장기 기후 변동성을 통계적으로 분석하기 위한 문헌들을 조사하고, 장기적인 시간 흐름에 내재된 잠재적인 경향 및 변동성을 통계적 분석을 파악하고자 한다. 이를 위해 주어진 수문 시계열에 내재된 저주파 신호을 추출하기 위한 경험적 모드분해법을 활용하여 수문 자료에 내재된 장기 변동성을 추출하였으며, 산업화 이전부터 연장된 수문 시계열의 공학적 활용성을 분석하고자 한다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2012.05a
• /
• pp.532-538
• /
• 2012

Failure mechanisms for a highly filled elastomer were discussed, and the stip-yield and the inherent flaw models were applied to them. Then, failure assessment diagram methods were investigated by means of modified two models. Fracture toughness tests using CCT(center-cracked tension) specimens made of a highly filled elastomer were conducted to generate the failure assessment diagrams. The failure assessment diagram of the inherent flaw model was normalized in order to compare with that of the modified strip-yield model. From the comparison of two failure assessment diagrams, it was found that the failure assessment diagram of the modified inherent flaw model more conservatively assesses the failure than that of the modified strip-yield model.

• International Journal of Highway Engineering
• /
• v.6 no.2 s.20
• /
• pp.25-36
• /
• 2004

The pressuremeter test can be used as an effective tool for evaluating stiffness of lower pavement layers including subgrade and subbase. At present, the most practical and applicable methods for evaluation of the stiffness of the subgrade and subbase are PBT and CBR in Korea. However, these methods have inherent drawbacks and large variabilities of test results themselves. In this study, an evaluation method and a test procedure that can be used for decision of pavement stiffness using pressuremeter were developed. The obtained results representing stiffness of the subgrade and subbase can replace PBT's soil reaction value k and CBR in design methods. It is found that the developed procedure based on the pressuremeter can provide an effective correaltion between the PBT's soil reaction value k and PMT's reloading modulus ($E_R$).

• The Journal of the Korea Contents Association
• /
• v.9 no.1
• /
• pp.223-237
• /
• 2009

We aimed at identifying the determinants of favorable UCC usage and creation by integrating emotional dimension, social influence and motivations. The finding show the significant effect of pleasure on intrinsic motivation in both Korea and U.S.A. Arousal has a positive effect on intrinsic motivation in the United States, but it has no relationship wit h intrinsic motivation in Korea. In case of social influence, subjective norm gives a significant impact on extrinsic motivation whereas proved insignificant in the United States. Image is shown to be significantly related with extrinsic motivation in both nations. Also, intrinsic motivation does not posit an effect on UCC usage and creation in Korea whereas it influences on UCC usage and is not related with UCC creation in the United States. In addition, it was observed that UCC usage has a positive and significant impact on UCC creation in both nations.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.33 no.9
• /
• pp.34-40
• /
• 2005

In present study, a two dimensional unsteady Navier-Stokes solver has been developed using the Diagonalized ADI (DADI) method and implicit dual time stepping method. The jacobian matrices in steady state Navier-Stokes equations are introduced from inviscid flux terms. The implicit treatment of artificial dissipation terms results in a block penta-diagonal matrix system and it becomes a scalar penta-diagonal matrix by diagonalization. In steady state equations about fictitious time, a new residual including a real time derivative term is introduced. From a converged solution about fictitious time, a real time unsteady solution can be obtained, which is called 'implicit dual time stepping method'. For code validation, an oscillating flat plate, a regular Karman vortices past a circular cylinder and shock buffeting around a bicircular airfoil problems are numerically solved. And they are compared with a theoretical solution, experiments and other researcher's computations.

• Journal of Digital Convergence
• /
• v.11 no.7
• /
• pp.111-122
• /
• 2013

The purpose of this study was to investigate the relationships among intrinsic motivators, psychological empowerment, affective commitment, and service quality among hotel industry employees. For this study, data were collected from 233 hotel employees in Seoul Metropolitan City with self-administered questionnaires and analyzed using structural equation modelling technique. This study found that two job characteristics variables(job challenge and job autonomy) had positive effects on hotel employees' psychological empowerment; that three job characteristics variables(job challenge, job variety and job autonomy) and psychological empowerment had positive effects on hotel employees' organizational commitment; and that psychological empowerment and organizational commitment had positive effects on hotel employees' service quality.

• Journal of the Korean Society of Child Welfare
• /
• no.59
• /
• pp.87-114
• /
• 2017

This study aimed to examine whether adolescents' self-esteem mediates the relationship between adolescent-teacher relationship and the intrinsic life goals of adolescents. This study used 1,776 cases from the sixth-wave data of the Korean Children and Youth Panel Survey (KCYPS). This study conducted a hierarchical regression analysis and a Sobel test to examine whether the mediation effect was significant. Primary findings are summarized as follows: First, adolescents who had a good relationship with their teacher were more likely to have better intrinsic life goals. Second, adolescents who had a good relationship with their teacher were found to have higher levels of self-esteem. Third, the effect of adolescents' relationship with teachers on intrinsic life goals was found to be partially mediated by self-esteem. This study concludes with implications, limitations, and suggestions for future research.

• The Journal of Korean Philosophical History
• /
• no.23
• /
• pp.245-273
• /
• 2008

Choi Je Woo was stressed superiority of god and it was immanence. IT was religion human theory. Choi See Hyung and Son Byung Hee writed change from god to the heaven. It was stressed superiority of god better than immanence of heaven. Choi Je Woo of human must attend god changed Choi See Hyung and Son Byung Hee of human being god. Choi See Hyung and Son Byung Hee was stressed the subject. Choi Je Woo was stressed superiority of god speciality. Choi See Hyung and Son Byung Hee was not disappeared absolutely. Son Byung Hee of human being god disappeared absolutely because it leave only immanence of god by Yi Don Hwa.

• Journal of Digital Convergence
• /
• v.20 no.5
• /
• pp.61-68
• /
• 2022

This study examines the impact of consumers' subjective perception on the quality loyalty of the Internet of things, explores academic innovation schemes, and puts forward business strategies for on-site optimization of the industry. The research methods use online survey methods for Chinese consumers who have used or bought Xiaomi IoT products. The results show that the inherent attributes of Internet of things products have an impact on brand image, and brand image has an impact on customer loyalty. Brand image shows complete media effect in the relationship between hyper-connectivity and customer loyalty of Internet of things products. For the enterprises that develop the Internet of things, obtaining the perceived brand image has a very important strategic significance in expanding the loyal customer base.

• 한국벤처창업학회:학술대회논문집
• /
• 2020.11a
• /
• pp.69-80
• /
• 2020

본 연구는 국내 기업의 대다수를 차지하고 있는 중소기업 중 기술과 연관성이 깊은 제조 분야의 종사자를 대상으로 기업과정신과 개인적 특성에 대한 핵심요인이 창업 의도에 미치는 영향을 조사해보았다. 특히 기업가정신의 핵심요인과 개인적 특성이 기회역량을 매개로 하였을 때 창업의도에 어떠한 유의미한 연관성을 설명해 줄 것인지 그리고 창업의도에 공기업의 기술개발지원사업(R&D)이 어떠한 조절적 영향을 미치는지에 대해 알아보고 제조분야 중소기업 창업 활성화를 위한 정부의 정책 설정에 시사점을 제공할 목적으로 수행하였다. 이를 위해 장치산업과 관련된 제조분야 중소기업 종사자 292명을 대상으로 2020년 5월 설문 조사를 통해 자료를 수집하였고, 각종 통계분석과 방정식을 통해 자료를 분석하였다. 기업가정신의 핵심요인 중 진취성과 개인적 특성 중 하나인 내재적 통제 요인이 반복적으로 결과에 영향을 미치지 못하였는데, 이는 실제 창업 이전단계에서 나타날 수 있는 특성으로 구분할 수 있으며, 혁신성 또한 창업 전, 후로 구분하여 연구해야 할 필요성을 확인하였다. 연구의 결과를 정리하면 다음과 같다. 첫째, 기업가정신의 핵심변수인 혁신성, 진취성, 위험감수성 중 진취성을 제외한 요인이 기회역량에 영향을 미치며, 개인적 특성의 하위변수인 자기효능감, 내재적 통제, 모호성에 대한 인내 중 내재적 통제 요인만이 기회역량에 영향을 미치지 못하였다. 둘째, 기회역량의 하위변수인 기회인식과 평가는 모두 창업의도에 영향을 미치는 것으로 나타났다. 셋째, 기업가정신과 개인적 특성에 대한 하위요인과 창업의도 사이에서 기회역량의 매개 여부를 조사하였는데, 진취성과 내재적 통제 요인이 기각되었으며, 혁신성은 기회역량 중 기회인식만이 매개하는 것으로 나타났다. 마지막으로 공기업의 기술개발지원사업(R&D)이 창업의도를 조절하는데 유의미한 역할을 하는 것으로 나타났다. 이를 종합하면 기업가정신과 개인적 특성은 실제로 창업이 일어나는 전, 후로 구분하여 창업의도에 미치는 영향에 관한 연구가 진행되어야 한다는 점을 보여주고 있으며, 제조분야의 창업 활성화를 위한 정책을 수립하는 데 있어 효과적인 자료로 활용될 수 있는데 본 연구가 기여하는 바가 크다고 할 수 있다.