• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2009.10a
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• pp.17-20
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• 2009

• Journal of the Korean Chemical Society
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• v.35 no.5
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• pp.599-600
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• 1991

• Journal of the Economic Geographical Society of Korea
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• v.15 no.3
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• pp.404-423
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• 2012

This study is aimed at exploring the impact of the characteristics of the firms on firm's networking. We develop a framework theorizing firm's networking according to sales, size, research facility, the percentage of R&D staff to total employees, the percentage of R&D investment to total sales, the number of the certification, the intention of attending seminars, the experience of participating in the government subsidy program. The results of the analysis show that research capacity, openness to a variety of information source, the experience of participating in the government subsidy program are significant in determining the firm's networking. The government needs to encourage the firms to improve their research capacity, and to train the coordinators to help the firms get higher openness to a variety of information source, use the government subsidy program.

• 한국노년학
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• v.31 no.2
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• pp.419-437
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• 2011

The purpose of this study is to compare on the productive activities and life satisfaction between rural and urban elderly. Economic activities and caring labor activity had a negative effect on life satisfaction. but, community participation had a positive effect. In other words, the concept of productive activities in life satisfaction has multidimensionality. Therefore, using multiple indicators to measure is inappropriate. And, according to Chow test, coefficients that describe the structure of life satisfaction were different between the elderly living in rural and urban. The self-actualization needs of the elderly can be interpreted as due to be implemented differently, because of the different cultures of urban and rural areas. And, In life satisfaction, we have found that individual volunteer activity is more effective than volunteer through groups.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.7 no.1
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• pp.108-115
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• 1995

An efficient model for the dynamic analysis of caisson breakwaters under impulsive wave loadings is presented. The caisson structure is. regarded as a rigid body, and the rubble mound foundation is idealized as virtual added masses, springs, and dampers using the elastic half-space theory. The frequency-dependent hydrodynamic added mass and damping coefficients are considered by using the time memory functions and added mass at infinite frequency. To simulate the permanent sliding phenomenon of the caisson, the horizontal spring is modeled as a nonlinear spring with plastic behaviors. Comparisons with experimental results show that the present model gives fairly good results. Sensitivity analysis is performed for the relevant parameters affecting the dynamic responses of a caisson breakwater. Numerical experiments are also carried out to investigate the applicability to the prediction of permanent sliding distance and critical weight of the caisson.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.5
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• pp.667-674
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• 2023

In the event of a disaster occurring within a building, the prompt and efficient evacuation and rescue of occupants within the building becomes the foremost priority to minimize casualties. For the purpose of such rescue operations, it is essential to ascertain the distribution of individuals within the building. Nevertheless, there is a primary dependence on accounts provided by pertinent individuals like building proprietors or security staff, alongside fundamental data encompassing floor dimensions and maximum capacity. Consequently, accurate determination of the number of occupants within the building holds paramount significance in reducing uncertainties at the site and facilitating effective rescue activities during the golden hour. This research introduces a methodology employing computer vision algorithms to count the number of occupants within distinct building locations based on images captured by installed multiple CCTV cameras. The counting methodology consists of three stages: (1) establishing virtual Lines of Interest (LOI) for each camera to construct a multi-camera network environment, (2) detecting and tracking people within the monitoring area using deep learning, and (3) aggregating counts across the multi-camera network. The proposed methodology was validated through experiments conducted in a five-story building with the average accurary of 89.9% and the average MAE of 0.178 and RMSE of 0.339, and the advantages of using multiple cameras for occupant counting were explained. This paper showed the potential of the proposed methodology for more effective and timely disaster management through common surveillance systems by providing prompt occupancy information.

• Transactions of the Korean hydrogen and new energy society
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• v.18 no.3
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• pp.275-283
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• 2007

본 논문은 세관(ID<7 mm) 내 R-22와 R-134a의 증발 열전달과 유동양식에 대한 실험적 연구이다. R-22와 R-134a의 유동양식을 관찰하기 위해 내경 2와 8 mm의 파이렉스 튜브를 사용하였고, 열전달 계수는 내경 1.77, 3.35, 5.35 mm의 수평 평활동관에 대해서 측정하였다. 증발 유동양식에서 내경 2 mm의 환상류 영역이 내경 8 mm에 비해 저건도 영역에서 발생하는 것을 확인할 수 있었고, 내경 2 mm의 유동양식은 Mandhane의 선도와 많은 오차를 보였다. 세관(ID<7 mm) 내 증발 열전달 계수는 종래의 대구경관(ID>7 mm)에 비해 관직경에 대한 영향이 많이 나타나는 것을 알 수 있었다. 내경 1.77 mm의 열전달 계수는 내경 3.36 mm와 5.35 mm에 비해서 20내지 30% 정도 높은 것을 나타났다. 또한 종래의 열전달 상관식(Shah's, Jung's, Kandlikar's and Oh-Katsuda's correlation)과 비교한 결과, 실험 데이터는 상관식과 많은 이탈 정도를 보였다. 따라서 실험데이타를 기초로 세관내 R-22와 R-134a에 적용할 수 있는 증발 열전달 상관식을 새로이 제안하였다.

• The Journal of the Acoustical Society of Korea
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• v.34 no.4
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• pp.310-315
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• 2015

A single channel VAD (Voice Activity Detection) algorithm for nonstationary noise environment is proposed in this paper. Threshold values of the feature parameter for VAD decision are updated adaptively based on estimates of means and standard deviations of past non-speech frames. The feature parameter, SPD-TE (Spectral Power Difference-Teager Energy), is obtained by applying the Teager energy to the WPD (Wavelet Packet Decomposition) coefficients. It was reported previously that the SPD-TE is robust to noise as a feature for VAD. Experimental results by using TIMIT speech and NOISEX-92 noise databases show that decision accuracy of the proposed algorithm is comparable to several typical VAD algorithms including standards for SNR values ranging from 10 to -10 dB.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.4
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• pp.897-912
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• 2017

This paper focuses on how the protection of information security incident is effective in via Information security awareness when conducting information security activities of enterprises. Research models have theorized that the information security activity and the information security awareness will reduce the incidence of information security. The general characteristics of analysis targets have been carried out in the frequency analysis, and the reliability of the measuring tool has been utilized to calculate the coefficient of Cronbach's information protection. Evidence has been demonstrated regarding the relationship between information security activities and information security awareness and information security incidents.

• Korean Journal of Social Welfare
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• v.67 no.2
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• pp.5-31
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• 2015

This study aims to develop the corporate philanthropy scale focusing on the guidelines of ISO26000 and to test its reliability and validity. For the purpose of this study, author conducted focus group interview, individually interview, consult and pilot test in order to clarify description and relevance of scale items. To test reliability and validation of scale, 94 staffs in charge of the corporate philanthropy work in the companies were surveyed as research subjects. The results of the explanatory factor analysis on scale found the six factor structure and 27 items. The construct validity and discriminant validity were confirmed through the confirmatory factor analysis. The reliability of the scale also remained at a high level. Based on these results, implications for corporate philanthropy was suggested.