• 전기학회논문지P
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• 제52권3호
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• pp.127-136
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• 2003

A point of doing this research is to give basic data for Junior college having matriculation resources in department of electricity majoring to the graduate students from technical high school in department of electricity. We have examined the effect of the 6th and the 7th educational curriculum and courses in department of electricity on technical high school and analyzed basic subjects of technical high school and detailed major basis subject of junior college in department of electricity by educational courses and mathematics education contents. Also we have examined tried to secure advantage of major studying on the basis of result of analysis.

• International Journal of Internet, Broadcasting and Communication
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• 제11권1호
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• pp.1-7
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• 2019

Nowadays learning has developed to a new way of anywhere and anytime by using mobile devices called m-learning which can provide flexibility, independency and creativity in academic environment. Most studies about m-learning are for higher education and the most users of m-learning are higher education students. Although developed countries are using m-learning in educational sectors, most of the Middle East countries are far from m-learning, and facing number of challenges. In Iran m-learning is still in early stage of implementation in higher education and in terms of technical and infrastructural aspects there is a vast gap in compare with developed countries. Although technical and infrastructural difficulties are one of the significant aspects in implementation and integration of m-learning technologies in education, the technology will not be successful if could not adopt with users. Due to the importance of user adoption with m-learning, there are limited studies about m-learning adoption in higher education of Iran. This paper attempts to review on technical and infrastructural aspects that facilitate m-learning which have effect on adoption of Iran higher education system. The review of the trend in the literature provides a reference for higher education institutes for decision making in developing m-learning for their students.

• 한국산학기술학회논문지
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• 제12권2호
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• pp.653-664
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• 2011

본 연구에서는 전문계 고등학생의 학교 적응유연성에 영향을 미치는 위험요인과 보호요인이 무엇인지 알아보기 위해 서울, 경기 지역의 전문계 고등학교 학생 573명과 인문계 고등학생 512명을 대상으로 설문조사를 통해 자료를 수집하였다. 연구 결과는 다음과 같다. 첫째, 학교 적응유연성과 위험요인과의 상관관계를 분석한 결과 위험요인이 높을수록 학교 적응유연성은 낮게 나타났다. 둘째, 위험요인이 학교 적응유연성에 미치는 영향을 검증한 결과, 전문계고 학생들에게는 교사차별, 비행유대, 반사회성이 영향을 미쳤고, 인문계고 학생들에게는 교사차별, 비행유대, 우울이 영향을 미쳤다. 셋째, 학교 적응유연성과 보호요인과의 상관관계를 분석한 결과 보호요인이 높을수록 학교 적응유연성은 높게 나타났다. 넷째, 보호요인이 학교 적응유연성에 미치는 영향을 검증한 결과, 전문계고 학생들에게는 교사지지, 학교의 민주적 분위기, 책임감, 가족응집력, 자아존중감, 합리적 부양태도로 나타났고, 인문계고 학생들에게는 교사지지, 민주적 학교 분위기, 책임감, 가족 응집력이 영향을 미쳤다. 다섯째, 학교계열과 학교 적응유연성 수준에 따른 위험요인과 보호요인의 차이를 분석한 결과 반사회성, 우울, 비행유대, 자아존중감의 변인에서 상호작용이 나타났다.

• 정보화정책
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• 제25권1호
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• pp.99-114
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• 2018

조직의 정보보안은 물리적, 기술적, 관리적 영역에서 균형적으로 이뤄져야 한다. 그러나 과거 기업의 정보보안 대책은 주로 물리적, 기술적 영역에 집중되는 경향이 있었다. 최근 조직구성원에 의한 보안사고가 늘어남에 따라 기업에서도 인적 보안 관리나 정보보안 교육에 관심이 점차 높아지는 추세이다. 본 연구는 현장실험을 통해 보안교육이나 보안서비스 제공이 조직구성원의 보안정책 준수 행동에 어떤 영향을 미치는지 알아보았다. 연구 1에서 국내 대기업 임직원을 대상으로 스팸 이메일 대응교육을 실시한 후 교육 효과를 알아보기 위해 스팸 이메일 열람 여부를 측정했고, 3개월이 지난 후에도 효과가 지속되는지 알아보았다. 연구 2에서는 보안서비스의 효과를 알아보기 위해 보안경고 알림 메시지를 제공한 후 그 효과를 측정하였다. 실험 결과, 보안교육은 보안정책 준수 행동에 긍정적인 영향을 미치는 것으로 나타났다. 보안교육 직후 교육 이수집단이 미이수집단에 비해 스팸 이메일 열람률이 낮았다. 그러나 3개월 후 이러한 집단 간 차이는 사라졌다. 또한 보안위험 경고 알림 메시지는 스팸 이메일을 열람률을 낮추는 데 효과가 큰 것으로 나타나 보안정책 준수 행동에 긍정적인 영향을 미쳤다. 이 결과는 조직의 인적보안관리를 위해서는 지속적인 보안교육이 필요하고, 보완적으로 보안서비스를 활용할 필요가 있음을 시사한다.

• 한국주거학회논문집
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• 제13권4호
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• pp.61-66
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• 2002

The objectives of this study are to clarify the impacts of stack effect in high-rise residential buildings and to present technical methods to reduce stack effect. For the evaluation of stack effect, architectural design guidelines were used and computer program simulations based on network model were performed. The evaluation shows that problems due to stack effect may be reduced by appropriate architectural designs, such as increase in air-tightness of building envelop, and provision of vestibules around entrance and elevator hall doors.

• 펄프종이기술
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• 제37권2호
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• pp.11-20
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• 2005

This study was carried out to investigate the influence of paper stock type and heat treatment on sizing effect. Various types of pulps were used to make handsheets sized internally with AKD(alkyl ketene dimer) and externally with CMC(carboxyl methyl cellulose). Most of the handsheets were treated with heat by dry oven $(100^{\circ}C,\;30min)$ to evaluate the effect of heat treatment on sizing development. Internal sizing development of newsprint was very bad, but the effect of heat treatment was much higher than those of NBKP, BCTMP. In case of surface sizing, newsprint was more effective compared to the other pulps. Considering above mentioned results, it seems that internal sizing slows down water into paper by molecular diffusion much more than capillary penetration, but surface sizing slows down capillary penetration. With regard to density, a higher thickness sheets showed high heat treatment effect on sizing, therefore it assumed that heat treatment effect on sizing had very close relationship with sheet density.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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• pp.395-400
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• 2006

Polylactic acids polymer (PLA) was applied as an additive to improve the strength properties of handsheets prepared from three unbleached southern pine kraft pulps with different kappa number and an aspen bleached chemithermomechanical pulp (BCTMP). The results showed that PLA could greatly improve the tensile and burst strength of the pulp handsheets. Heat pressing effect was also important to enhance the strength properties. For unbleached kraft pulps, it was found that an appropriate amount of residual lignin in pulps had a positive effect on the handsheets strength improvement when adding PLA. The thickness of the handsheet did not change the PLA strengthening effect. In general, PLA effect on tear strength improvement could be neglected. However, it had a significant effect on the improvement of tear strength for the aspen BCTMP handsheets not containing sufficient amount of fines.

• 펄프종이기술
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• 제37권5호통권113호
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• pp.1-7
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• 2005

The objective of this work was to investigate the effect of spreading behavior of the sizing agents (AKD or dialkyl ketone) on the sizing development of AKD-sized paper. There was a direct relationship between the spreading behavior of the sizing agents and their melting points. Both AKD and dialkyl ketone showed no substantial spreading until the temperature reaches to their melting points. Consequently, dialkyl ketone did not provide sizing development when the paper was heat-treated below $75^{\circ}C$, while AKD provided sizing effect even the paper heated at $50^{\circ}C$. The ketone, however, provided rather higher sizing effect than that of AKD, when the paper was heat-treated over $100^{\circ}C$. This result means that the ketone also gives sizing development to paper, moreover the ketone could give higher sizing effect to paper than AKD when it was melted and well spreaded on the fiber surface. While the ketone introduced to papers from hydrolyzed AKD emulsion could not contribute to sizing development.

• Structural Engineering and Mechanics
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• 제31권6호
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• pp.639-662
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• 2009

A comprehensive investigation of the stochastic response of an isolated cable-stayed bridge subjected to spatially varying earthquake ground motion is performed. In this study, the Jindo Bridge built in South Korea is chosen as a numerical example. The bridge deck is assumed to be continuous from one end to the other end. The vertical movement of the stiffening girder is restrained and freedom of rotational movement on the transverse axis is provided for all piers and abutments. The longitudinal restraint is provided at the mainland pier. The A-frame towers are fixed at the base. To implement the base isolation procedure, the double concave friction pendulum bearings are placed at each of the four support points of the deck. Thus, the deck of the cable-stayed bridge is isolated from the towers using the double concave friction pendulum bearings which are sliding devices that utilize two spherical concave surfaces. The spatially varying earthquake ground motion is characterized by the incoherence and wave-passage effects. Mean of maximum response values obtained from the spatially varying earthquake ground motion case are compared for the isolated and non-isolated bridge models. It is pointed out that the base isolation of the considered cable-stayed bridge model subjected to the spatially varying earthquake ground motion significantly underestimates the deck and the tower responses.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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• pp.217-221
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• 2002

In the coarse grain HAZ adjacent to the fusion line, most of the TiN particles in conventional Ti added steel are dissolved and austenite grain growth is easily occupied during welding process. To avoid this difficulty, thermal stability of TiN particle is improved by increasing the nitrogen content in steel. In this study, the effect of high nitrogen TiN particle on preventing austenite grain growth in HAZ was investigated. Increased thermal stability of TiN particle is helpful for preventing the austenite grain growth by pinning effect. High nitrogen TiN particle in simulated HAZ were not dissolved even at high temperature such as 1400 C and prevented the austenite grain growth in simulated HAZ. Owing to small austenite grain size in HAZ the width of coarse grain HAZ in high nitrogen TiN steel was decreased to 1/10 of conventional TiN steel. Even high heat input welding, the microstructure of coarse grain HAZ consisted of fine polygonal ferrite and pearlite and toughness of coarse grain HAZ was significantly improved.