• Journal of Korea Multimedia Society
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• v.11 no.8
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• pp.1129-1137
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• 2008

E-learning as a new education trend is being applied not only to cyber school but also various education fields such as employee training for companies or interactive learning for consumers. Users of the E-learning can take online tests individually anywhere, to evaluate their achievement level. Because users who are taking the online tests may show their own IDs or passwords to others, the possibility of cheating is very high. Therefore, it is very important to authenticate the users. In this paper, we propose an adaptive-keyboard authentication method which depends on user behavior patterns through the use of IDs and passwords. This method does not need any additional devices or special effort. An adaptive method to update patterns in which IDs and passwords are entered was previously suggested and this new method has proved to be better than previous methods through simulations and implementation.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1834-1838
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• 2007

감조하천을 비롯한 주요 하천에서 수자원량의 정량화는 수위-유량관계곡선식 개발로부터 가능한 일이다. 그러나 신뢰성 있는 수위-유량관계곡선식을 개발하는 것은 수문관측의 불확실성과 현장의 열악한 사정 등으로 발생하는 오차들 때문에 어려운 일이다. 조위의 영향을 받는 감조하천은 무 강우에도 수위의 변동이 심한 특성으로 수위와 유량의 관계를 규정하는 것은 일반 하천의 경우보다 난해하다고 할 수 있다. 본 연구는 감조하천의 유출특성 분석에 관한 기초적인 연구로 향후 감조하천 구간에 설계되는 수공구조물의 설계, 혹은 치수목적으로 설계되는 유수지 등의 설계에 이용될 유량자료를 제공하기 위함이다. 유량자료를 생산하기 위해서는 대상 수위관측소지점의 수위-유량관계곡선식으로부터 수위-수문곡선을 유량-수문곡선으로 환산하여야 한다. 이렇듯 유량자료는 곡선식의 정밀도에 전적으로 좌우되기 때문에 신뢰성 있는 곡선식 개발은 중요한 일이다. 본 연구에서는 감조하천에서의 유량자료 생산과 유출 특성을 분석하고자, 만경강 수계에 위치하는 목천 지점을 대상유역으로 선정하였다. 2006년 저 평수기 및 홍수기에 걸쳐 유량측정을 실시하여 다수의 유량측정성과를 확보하였으나 조위의 영향으로 산만한 수리특성을 보였다. 따라서 본 연구에서는 이에 대한 영향을 파악하기 위해서 감조의 영향권에서 각각의 유량이 어떻게 변화하는지 검토하고자 국립해양조사원 해양자료실의 조위관측소에서 제공하는 군산외항 지역의 조석예보표를 이용하여 분석하였다. 본 연구의 분석 결과, 유량측정 당시 간조와 만조의 영향권에서 측정이 이루어진 관계로 유량과 유속 등의 수리 특성이 많은 변화가 발생한 것으로 분석되었다. 이와 같은 영향으로 목천과 같은 감조하천의 경우, 저수위 측정성과는 그 분산정도가 심해 일반화된 수위-유량관계 곡선의 개발이 의미 없다고 판단되며, 홍수기에 측정된 성과를 바탕으로 고수위대의 수위-유량관계 곡선식을 개발하여야 할 것으로 판단된다. 본 연구를 통해 일부 확인된 바와 같이, 일반적인 자연하천이 아닌 감조하천의 경우는, 각각의 수위대별 유량 값의 변화가 발생하는 바 기간별 혹은 간조와 만조부를 포함하여 유량측정을 하여야 할 것으로 판단된다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.29 no.5
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• pp.228-238
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• 2017

In coastal region, tidal harmonic constants of semi-diurnal tides and nonlinear tides were collected. The observed tide data of KHOA were analyzed by a tide harmonic analysis method. In the southwestern coasts and Han river estuary, nonlinear tides are clearly generated. The generation of tide non-linearity and tide asymmetry is closely related with tide form factor in Korean coastal zone. Tide non-linearity and asymmetry in Mokpo harbour have increased by a series of coastal development projects. The increase has caused rise of high water level and drop of low water level, and increase of tidal range. In Kunsan Outport, tidal range has been declined due to inter-annual change of nonlinear tides after completion of Samangeum sea-dyke.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.32 no.4
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• pp.252-261
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• 2020

Numerical simulations of the storm surge and waves induced by the Typhoon Kong-Rey incident on the south coast of Korea in 2018 are conducted using the JMA-MSM weather field provided by the Japan Meteorological Agency, and the calculated surge heights are compared with the time history observed at harbours along the south-east coast. For the waves occurring coincidentally with the storm surges the calculated significant wave heights are compared with the data measured using the wave buoys operated by the KHOA (Korea Hydrographic and Oceanographic Agency) and the KMA (Korea Meteorological Administration), and the data observed at AWAC stations of the KIOST (Korea Institute of Ocean Science and Technology). Additional simulations are also performed based on the pressure and wind fields obtained using the best track information provided by the JTWC (Joint Typhoon Warning Center) of the United States, and the results are compared and analyzed. Based on the results of this study it is found that the reliable weather fields are essential for the accurate simulation of storm surges and waves.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.20 no.4
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• pp.383-388
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• 2002

This study suggests a data processing method for precise geoid height calculation through sea gravity data of mid-Yellow Sea provided by Haeyang 2000 and satellite altimetry data and the EGM96 geopotential model from GSFC/DMA in USA. Also it compared sea gravity data with satellite altimetry gravity data. As a result, precise geoidal undulation of the mid-Yellow Sea presented from calculating and integrating EGM96 geopotential model in degree and order 167 and a relative geoid by integral radius of 27km respectively It has a mean value of 18.339m, varying from 13.564m to 22.785m. the comparison between sea gravity data and satellite altimetry data shows that the former is more precise than the latter, which showed an anomaly of 0.56m0Gal and RMSE of 4.195m.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.9
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• pp.3967-3974
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• 2011

In this study, the college's curriculum and industry satisfaction with graduates were investigated. As a result, the college education of the consumer's feedback to an education as the basis for the survey was conducted. To this end, a survey of industry conducted and analyzed a result. Questions of the survey are as follows: Foundation for industrial research, the recruitment of new employees, research on skills, basic research on curriculum, and skills related to satisfaction surveys were conducted. According to survey results the average period of employment in manufacturing. Research and development, and public officials, and management in the area has served more than three years. Distribution and service the tourism sector, mainly two years. The major practical difficulty in working theory of scarcity and insufficient foreign language skills, and inter personal relationship. Working in a variety of school curriculum and an emphasis on training relevant and practical by developing a training curriculum and the majors, colleges will improve for the satisfaction.

• Journal of Korea Foundry Society
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• v.41 no.5
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• pp.445-453
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• 2021

Computational thermodynamics for various alloy systems is well known as the CALPHAD technique. Gibbs energy model parameters for each phase are obtained from experimentally measured thermodynamic properties and are mainly used to predict areas not experimentally measured and to analyze experimental results thermodynamically. In this study, the thermodynamic modeling of the Ni-Cr-Nb-C quaternary system is conducted for a thermodynamic analysis of the phenomena by which heat-resistant cast alloys (IN-657) are destroyed in certain areas after long-term use. The stable phases in the system according to the Cr content, phase fraction depending on the temperature, and long-range ordering parameters for the Ni₂Cr phase are calculated and compared to results obtained experimentally. The calculated thermodynamic properties suitably explain the experimentally reported fracture temperature range and the results of stable phases formed in the fractured areas. Thermodynamic modeling through the CALPHD method is expected to be useful for analyzing and predicting the thermodynamic behaviors of various cast alloys.

• Journal of Convergence for Information Technology
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• v.9 no.5
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• pp.243-251
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• 2019

Men's beauty experts are engaged in the beauty area, which has been recognized as a woman's entirety due to changes in the society in which the standards of the occupational groups according to sex are collapsed. The purpose of this study is to find out the strategic implications for attracting male beauty workers to male beauty practitioners through the influence of the service quality of male sales workers of cosmetics road shop among the growing beauty industry and increasing male beauty practitioners. I want to provide you with basic data. As a result, the service quality of male sales personnel of cosmetics road shop had a positive effect on the purchasing intention. As a result, male sales workers of cosmetics road shop seemed to have a well - It is necessary to provide continuous product education and education to provide prompt and accurate service.

• The Journal of the Convergence on Culture Technology
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• v.8 no.2
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• pp.23-28
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• 2022

This paper analyzed the influence of employment, human resource development, and labor practices on the corporate performance. Data were collected from the Korea Labor Institute's workplace panel survey(WPS) from 2017, and the analysis used 2,868 companies. This study employed operating profit as a corporate performance. Employment included open recruitment of new employees, evaluation of NCS job competency, and implementation of core human resources acquisition program. Human resource development consisted of incumbent training, job competency improvement evaluation, management program for low performer, emoloyee's career plan, and HRD using job analysis. Labor practices included guarantees for parental leave, guarantees for maternity leave, and support for childcare facilities. The analysis method used binominal logistic regression analysis for two groups of operating profit surplus and deficit companies. As a result of the analysis, it was possible to confirm the influence of employment, human resource development, and labor practices on performance. And the implications of employment, human resource development, and labor practices to improve corporate performance were discussed.

• Journal of Industrial Convergence
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• v.20 no.11
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• pp.233-240
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• 2022

The purpose of this study is to understand the influence factors of job stress and resilience to recovery in an organization on job satisfaction and immersion in the organization. For this reason, we developed a questionnaire scale based on previous research, and conducted a questionnaire survey of the sales staff of company S. As a result of the analysis, it was found that job stress had a significant effect on job satisfaction, and job stress had a significant effect on recovery elasticity. It was shown that recovery elasticity affects job satisfaction and organizational immersion, and that job satisfaction affects organizational immersion, but the hypothesis that job stress has a significant effect on organizational immersion was rejected. In addition, it was found that recovery elasticity mediates the relationship between job stress, job satisfaction, and organizational immersion. The results of this study are expected to be used as guidelines for various practical plans that can improve the resilience of recovery as well as stress management of organizational members in the organization.