• 한국컴퓨터정보학회논문지
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• 제26권10호
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• pp.83-91
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• 2021

본 논문에서는 단순한 드론 조작 교육을 통한 자격증 취득 교육이 아닌 특성화된 에듀테인먼트 SW 교육강사 및 드론 실감미디어 크리에이터 양성을 위한 효율적인 교육 방법을 제시한다. 이를 위해 일차적으로 NCS 기반 교육과정을 도출하였다. 개발된 교육과정으로는 에듀테인먼트 드론 교육과정과 실감미디어 크리에이터 교육과정이 있다. 이 중 드론 조종 교육과정에 대해 핵심 책무를 정의하고 각각에 대해 핵심작업, 지식, 태도를 기술함으로써 드론 조종에 대한 세부 교육과정을 도출하였다. 실감미디어 크리에이터 교육과정에서는 광고 영상물을 실제 제작하는 파일럿 과정을 통해 산업 현장에서 바로 활용할 수 있는 전문가 교육을 실시하였다. 최종적으로 메타버스 환경에서 온라인 컨퍼런스 개최를 통해 교육생들이 제작한 미디어 영상물을 서로 공유하고, 토론하는 가상 컨퍼런스를 운영하였다. 교육종료 후에는 교육 수료자 46명을 대상으로 교육만족도 분석을 통해 본 교육과정의 효율성을 증명하였다. 본 논문은 포스트 코로나 이후 우리 사회가 해결해야 하는 비대면 온라인 교육에서의 SW 교육 내실화를 이룰 수 있는 방법을 제시하였으며, 실감미디어 크리에이터 양성 교육과정과 파일럿 프로그램, 메타버스 컨퍼런스 운용 사례를 보임으로써 실감미디어 환경에서의 효율적인 교육 방법을 제시하였다.

• Journal of Biosystems Engineering
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• 제15권3호
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• pp.219-229
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• 1990

The compression creep behavior of grains when loaded depends not only on load but also on duration of load application. The most common methods of studying the load-time characteristics of agricultural products is by employing rheological models such as Burger's model. However it is sometimes not sufficient to describe the viscoelastic behavior of grains to be Burger's model. For this reason, this study was conducted to develop the rheological model which represented the creep compliance response of the rough rice kernel and was a function of initial stress applied and time. The effects of the initial stress applied and the moisture content on the compression creep behavior of the rough rice kernel were analyzed. The results were obtained from the study as follows: 1. Since the viscoelastic behavior of the rough rice kernel was nonlinear, the transient and steady state creep compliance was satisfactorily modelled as follows: $$J({\sigma},t)=A{\sigma}^B[C+Dt-exp(-Ft)]$$ But, for the every stress applied, the compression creep behavior of the samples tested can be well described by Burger's model respectively. 2. The creep compliance, the instantaneous elastic strain, the retarded elastic strain and the viscous strain of the sample tested generally increased in magnitude with increasing the applied initial stress and the moisture content used in the tests. At low moisture content, the creep compliance for the Japonica-type rough rice kernel Was a little higher than those for Indica-type and at high moisture content, vice versa at high moisture content. 3. The retardation times of the samples had not an uniform tendency by the initial stress and the moisture content. The retardation times ranged from 0.66 to 6.76 seconds, and the creep progressed from transient to steady state at a relatively high rate. 4. The less viscous strain than the instantaneous elastic strain for the samples tested indicated that rough rice kernel behaved as a viscoelastic body characterized by elasticity than viscosity.

• 한국금형공학회:학술대회논문집
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• 한국금형공학회 2008년도 하계 학술대회
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• pp.39-44
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• 2008

Magnesium alloys have given high attention to the industry of light-weigh as automobile and electronics with aluminium, titanium and composite alloys due to their high strength, low specific density and good damping characteristics. But the magnesium contained structures under high temperature have the problems related to creep deformation and rupture life, which is a reason of developing the new material against creep deformation to use them safely. The purpose of this study is to predict the creep deformation mechanism and rupture time of AZ31 magnesium alloy. For this, creep tests of AZ31 magnesium alloy were done under constant creep load and temperature with the equipment including automatic temperature controller with acquisition computer. The apparent activation energy Qc and the applied stress exponent n, rupture life have been determined during creep of AZ31 Mg alloy over the temperature range of $150^{\circ}C$ to $300^{\circ}C$. In order to investigate the creep behavior. Constant load creep tests were carried out in the equipment including automatic temperature controller, whose data are sent to computer. At around the temperature of $150^{\circ}C{\sim}300^{\circ}C$ the creep behavior obeyed a simple power-law relating steady state creep rate to applied stress and the activation energy for the creep deformation was nearly equal and a little low, respectively, to that of the self diffusion of Mg alloy.