• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2006.06a
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• pp.232-249
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• 2006

e-learning은 오프라인 교육에 비해 시간과 공간의 제한을 받지 않고, 반복학습이 가능하며, 비용이 저렴하다. 그러나 이러한 장점에도 불구하고 1990년대 말 도입되어 6년 이상 경과되었으나 아직 널리 보급되지 않고 있다. 본 연구에서는 e-learning이 갖는 다양한 장점에도 불구하고 왜 채택이 저조한가에 대한 원인을 찾고, 보급을 확산시킬 방안을 찾는데 목적이 있다. 이를 위해 e-learning 채택에 대한 선행연구를 검토하고 e-learning 채택자와 미채택자에 대한 인터뷰를 수행하였다. 결과적으로 유용성, 지속성: 재미, 반복성, 비용, 접근성, 학습동기, 즉시성 요인이 e-learning 채택에 영향을 미친다는 연구모델을 도출하였다 여기서 비용과 접근성은 기존 선행연구들과 반대의 가설을 제시하였다. 즉, e-learning은 오프라인에 비해 비용이 저렴하기 때문에 그리고 반복해서 학습할 수 있기 때문에 학습을 미루게 되어 오히려 채택을 저해한다는 것이다. 다중회귀분석을 통해 검증한 결과 즉시성은 채택되지 않았고, 비용이 저렴하기 때문에 그리고 반복해서 학습할 수 있기 때문에 e-learning을 채택하게 된다고 나타나, 본 연구의 가설은 성립되지 않고 기존 연구가설이 타당한 것으로 나타났다. 본 연구의 대상이 e-learning을 사용해본 경험이 비교적 많지 않은 사람을 대상으로 하였기 때문에 나타난 결과라 생각된다. 향후 e-learning을 6개월 이상 사용해본 사람들을 대상으로 연구해 볼 필요가 있다고 생각된다.

• Journal of Science and Technology Studies
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• v.6 no.1 s.11
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• pp.89-118
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• 2006

The formation of early korean scientific community is a dynamic process of korean modern history in which colonialization, liberation, United States Army Military Government and Korean War is included. Particularly, scientist's crossing over the border into north korea and south korea have profound effect on the early stage of our scientific community. This period is so important to understand the nature of korean scientific community that we need to re-interpret the role of 'ideology' in the development of scientific community. On the other hand, war is a important element in our formation of the image of the science. This study purported to interpret the problem of political ideology, it's role in the formation of early scientific society, it's implication on our idea of science positively. Also the study is a an attempt to re-construct the scientist's struggle(1945-1950) to demarcate new science from old, colonial science.

• Journal of Digital Convergence
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• v.11 no.6
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• pp.311-317
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• 2013

Most of the existing interactive arts or entertainment systems consist of the following three steps: 1. the system's prompting the action of the participant, 2. action of the participant, and 3. response of the system. They do not presuppose these successive processes are performed continuously and repeatedly, and they are designed to express the concept of the work in each interaction. The opposite approach is to transmit the concept of the work in a continuous and repeated experience. The authors propose "Adjustive Media" as a type of work based on this approach. Adjustive Media has a spiral model with feedback. When participants experience the work repeatedly, they can recognize the difference of results between each interaction, and they can under- stand more closely the intent of the designer. This paper will propose 3 design processes for Adjustive Media as design method, and will introduce the prototypes of Adjustive Media.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.9
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• pp.1137-1140
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• 2014

Faulty electric motors onboard vessels with anomalies in windings or poor insulation are usually repaired at land based workshops and reinstalled in place by crew hands after receiving the repaired motors. Especially for 3 phase induction motors which need Y-${\delta}$ starters with 6 lead wires, it would happen that the polarities of stator windings cannot be well distinguished if the original tags of these wires are erased or not visible clearly, resulting in subsequent damage to the repaired motor due to extreme current flow when the power is given to the motor the stator windings of which are wrongly connected in the polarity. This study proposes an easy way to make correct connection in winding polarities without failures based on the electro-magnetically induced voltages on windings when a slight DC current is supplied to a winding coil by using an analog multi-tester. The proposed method is applied to actual motors and delves into the applicability for polarity discrimination through a few measurements onboard vessels.

• Journal of The Korean Association For Science Education
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• v.32 no.4
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• pp.703-716
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• 2012

Frequently, pre-service elementary teachers are asked to write reflective journals on their teaching during teacher education program. However, writing reflective journals can not guarantee pre-service teachers to learn from their experience. In this study, 44 reflective journals of pre-service elementary teachers on their science teaching were analyzed in terms of 'productive reflection', a concept suggested by Davis (2006). Productive reflection may help teachers' effective learning by considering interrelationships among aspects of teaching including learners and learning, subject matter knowledge, assessment, and instruction. The result showed what aspects of teaching were included, emphasized, and integrated in the pre-service elementary teachers' reflective journals. Implications for teacher education would be discussed.

• Polymer(Korea)
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• v.37 no.2
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• pp.162-166
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• 2013

Graphene-coated polymer particles have attracted research interests due to their emerging applications derived from their controlled structure and morphology. To control the properties of graphene oxide (GO)-polystyrene (PS) composite particles, the adsorption time and instantaneous adsorption conditions were investigated by varying their mixing method. Polystyrene particles prepared by emulsion polymerization were modified to have positive surface charge by adsorption of polyethylene imine (PEI) on the surface of PS particles. GO prepared by the chemical exfoliation method had negative surface charge from the oxygenated groups. The adsorption of the negatively charged GOs onto the positively charged PS particles was successfully completed, and it was found that a longer adsorption time and a greater difference in the instantaneous relative concentration led PS-GO particles to have more homogeneously coated surfaces without aggregation.

• Korean Journal of Plant Resources
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• v.26 no.5
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• pp.652-657
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• 2013

In the present study, anti-oxidative and the RMC proliferation inhibitory propeties of 80% ethanol extracts from 63 kinds of traditional medicines were investigated. Inhibitory effects of RMC proliferation were showed that Dalbergia odorifera T. Chen., Melia azedarach Linn$\acute{e}$ and Hydnocarpus anthelmintica Pierre. Among them Hydnocarpus anthelmintica Pierre had the highest anti-oxidative activity ($ORAC_{PE\;value}=1.6$, DPPH = 81.1), but Dalbergia odorifera T. Chen. and Melia azedarach Linn$\acute{e}$ had no effects. These results suggest that the Hydnocarpus anthelmintica Pierre could prevent or protect from kidney disease as antioxidant and anti-proliferative agent for RMC.

• The Journal of the Korea Contents Association
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• v.22 no.10
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• pp.460-474
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• 2022

The purpose of this study was to explore the perception of the extension of the retirement age perceived by corporation top leaders who are the main agents of employment. As a result of analyzing the interview data by qualitative content analysis, companies centered on manufacturing and construction preferred the elderly to foreign workers and leaders of social service organizations suggested that healthy and capable elderly people should be able to continue to work. However several opinions were also presented against the extension of the retirement age uniformly without considering the circumstances of the company. The passion for work of older workers with higher salary decreased, which concerns that the absence of a retirement system would reduce the vitality of the organization and increase the burden of labor costs. As an alternative to this, there is the opinion that employment can be extended even after the retirement age with the contract and in the form of a commissioned job according to an agreement with the company. Furthermore, it was also suggested that it would be easier not only to maintain employment but also to create jobs for the elderly given the employment flexibility.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.spc1
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• pp.84-91
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• 2006

This study was carried out to comparatively evaluate growth characteristics of rice cultivars under rice-mono (conventional) and rice-Chinese milk vetch (Vetch) cropping system. Six rice cultivars such as Geumobyeo, Pungmibyeo, Hwayeongbyeo, Sobibyeo, Junambyeo and Dongjinbyeo were tested in 2005. The results obtained are summarized as follows ; plant height and culm length of all the tested cultivars at heading and harvest time were shorter in rice-vetch cropping system than conventional, however, nitrogen content of rice plants at heading and harvesting time was higher in rice-vetch cropping system. The total amount of nitrogen of rice plants was higher in conventional than rice-vetch cropping system. Nitrogen content of rice plant and uptake of Pungmibyeo was the highest of all the tested cultivars in both cropping systems. Generally, grain yietd ef tested cultivars seemed to be higher in conventional than rice-vetch cropping system. And it was the highest in Junambyeo as compared to those of other cultivars. Head rice ratio and protein content were higher in rice-vetch cropping system.

• The Korean Journal of Applied Statistics
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• v.25 no.2
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• pp.363-376
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• 2012

Excessive zeroes are often observed in ordinal categorical response variables. An ordinary ordered Probit model is not appropriate for zero-inflated data especially when there are many different sources of generating 0 observations. In this paper, we apply a two-stage zero-inflated ordered Probit (ZIOP) model which incorporate the zero-flated nature of data, propose a Bayesian analysis of a ZIOP model, and apply the method to alcohol consumption data collected by the National Bureau of Statistics, Korea. In the first stage of a ZIOP model, a Probit model is introduced to divide the non-drinkers into genuine non-drinkers who do not participate in drinking due to personal beliefs or permanent health problems and potential drinkers who did not drink at the time of the survey but have the potential to become drinkers. In the second stage, an ordered probit model is applied to drinkers that consists of zero-consumption potential drinkers and positive consumption drinkers. The analysis results show that about 30% of non-drinkers are genuine non-drinkers and hence the Korean alcohol consumption data has the feature of zero-inflated data. A study on the marginal effect of each explanatory variable shows that certain explanatory variables have effects on the genuine non-drinkers and potential drinkers in opposite directions, which may not be detected by an ordered Probit model.