Cheongju National University of Education
Cheongju, South Korea

Cheongju National University of Education is one of several national universities of education in South Korea. It provides training to teachers, particularly those who plan to teach in public elementary schools. The campus is located in Cheongju City, the capital of North Chungcheong province. Campus facilities include a lab school, library, and broadcasting center. The current president is Su-Hwan Kim. The school employs around 55 professors. Wikipedia.

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Bae I.,Korea Advanced Institute of Science and Technology | Han J.,Cheongju National University of Education
ACM/IEEE International Conference on Human-Robot Interaction | Year: 2017

For humans, a taller height is an advantage in expressing one's dominant strictness to others. To this point, robotic telepresence has preferred low-height robotic platforms for reasons such as operational stability, user convenience and psychological comfort. We examined whether the height of the robot had an effect on an instructor connected to a telepresence robot in robot-assisted learning with regard to controlling a large number of students. The experiment showed that the use of a taller robot, compared to a shorter robot, did not make a meaningful difference in the instructors' authority being accepted by the students. Though, students felt a shorter robot friendly than a life-size taller robot. © 2017 Authors.

Kim B.,Korea University | Kim J.,Cheongju National University of Education
Performance Evaluation | Year: 2017

We consider a polling system with a single server and multiple queues where customers arrive at the queues according to independent Poisson processes. The server visits and serves the queues in a cyclic order. The service discipline at all queues is exhaustive service. One queue uses processor-sharing as a scheduling policy, and the customers in that queue have phase-type distributed service requirements. The other queues use any work-conserving policy, and the customers in those queues have generally distributed service requirements. We derive a partial differential equation for the transform of the conditional sojourn time distribution of an arbitrary customer who arrives at the queue with processor-sharing policy, conditioned on the service requirement. We also derive a partial differential equation for the transform of the unconditional sojourn time distribution. From these equations, we obtain the first and second moments of the conditional and unconditional sojourn time distributions. © 2017 Elsevier B.V.

Kim B.,Korea University | Kim J.,Cheongju National University of Education
Operations Research Letters | Year: 2017

We find the optimal policy for the information disclosure problem of the M/M/1 queue studied by Simhon et al. (2016). Our optimal disclosure policy is as follows: the service provider informs all customers of the queue length when the queue length is above a specified threshold and does not inform them when the queue length is below the threshold. © 2017 Elsevier B.V.

You D.K.,Kangwon National University | Lee J.H.,Kangwon National University | Hwang H.,Kangwon National University | Kwon H.,Cheongju National University of Education | And 2 more authors.
Tetrahedron Letters | Year: 2017

1,3,5-Tris-(o-carboranyl-methyl)benzene (closo-1) and its nido-form (nido-1) were synthesized and fully characterized. The solid-state molecular structure of closo-1 was determined by single-crystal X-ray diffraction analysis. Compound closo-1 exhibited an intense single emission in various organic solvents that was red-shifted with increasing solvent polarity. The positive solvatochromic effect and theoretical calculation results at the first excited (S1) optimized structure of closo-1 strongly suggest that this emissive band can be assigned to an intramolecular charge transfer. Meanwhile, nido-1 showed a pronounced red-shift of the emissive band compared to that of closo-1 and aroused low-energy emission. The specific emissive features of nido-1 were attributed to the elevation of its HOMO level, estimated by cyclic voltammetry. The photophysical changes by conversion from closo-1 to nido-1 allowed the emissive color-tunable sensing of fluoride. Thus, the tris-o-carboranyl compound showed great potential as a chemodosimeter for fluoride anion sensing, detectable by the naked-eye. © 2017 Elsevier Ltd.

Park J.,Kyungpook National University | Chung B.-H.,Cheongju National University of Education
Journal of Chemical Education | Year: 2015

Chemistry was almost exclusively the product of Western culture until the 20th century, and it was in the early 20th century that chemistry was introduced as a new type of learning within Korea. The work of a British chemist, Henry E. Roscoe, was unintentionally introduced into Korean education in 1907. We briefly explore how chemistry knowledge was accepted in Korea by tracing the publication process and lineage of Hong's Chemistry Textbook. © 2015 The American Chemical Society and Division of Chemical Education, Inc.

In J.,Chungnam National University | Han J.,Cheongju National University of Education
ACM/IEEE International Conference on Human-Robot Interaction | Year: 2015

This study is to verify the effectiveness of robot TTS technology in assisting Korean English language learners to acquire a native-like accent by correcting the prosodic errors they commonly make. Child English language learners' F0 range, a prosodic variable, will be measured and analyzed for any changes in accent. We examined whether if robot with the currently available TTS technology appeared to be effective as much as a tele-presence robot with native speaker from the acoustic phonetic viewpoint. © 2015 Authors.

Shin K.W.C.,Indiana University Bloomington | Han J.,Cheongju National University of Education
ACM/IEEE International Conference on Human-Robot Interaction | Year: 2016

The primary concern of this study is to explore children's engagement and learning experiences in distant learning environments using three different videoconferencing technologies-two traditional screen-based videoconferencing technologies and a remotely-controlled telepresence robot. To truthfully capture the perspectives of the children, we employed multiple data collection methods-rating scales, narratives, ranking scales, and one-on-one interviews, as well as observation of nonverbal cues. Our findings suggest that participants reacted more positively to interactions via telepresence robot than to screen-based video-conferencing. © 2016 IEEE.

Park S.J.,Yujin Robot and 601 | Han J.H.,Stanford University | Han J.H.,Cheongju National University of Education | Kang B.H.,Yujin Robot and 601 | Shin K.C.,Yujin Robot and 601
Proceedings of IEEE Workshop on Advanced Robotics and its Social Impacts, ARSO | Year: 2011

Various studies on robot assisted learning have proven them to be effective tools for language education because robots are remarkably successful in eliminating the affective filter. This study demonstrates ROBOSEM with class content for sustaining long-term interaction with students in English classes of elementary schools as a teaching assistant, not a teacher. We close with some practical considerations for the continuous process of improving technology and its diffusion throughout society, such as in elementary schools, through interviews with developers and observations from field trials. © 2011 IEEE.

Han J.,Cheongju National University of Education
Language Learning and Technology | Year: 2012

Along with the rapid development of information and communication technologies, educators are trying to keep up with the dramatic changes in our electronic environment. These days mobile technology, with popular devices such as iPhones, Android phones, and iPads, is steering our learning environment towards increasingly focusing on mobile learning or m-Learning. Currently, most interfaces employ keyboards, mouse or touch technology, but some emerging input-interfaces use voice- or marker-based gesture recognition. In the future, one of the cutting-edge technologies likely to be used is robotics. Robots are already being used in some classrooms and are receiving an increasing level of attention. Robots today are developed for special purposes, quite similar to personal computers in their early days. However, in the future, when mass production lowers prices, robots will bring about big changes in our society. In this column, the author focuses on educational service robots. Educational service robots for language learning and robot-assisted language learning (RALL) will be introduced, and the hardware and software platforms for RALL will be explored, as well as implications for future research. © 2012.

PubMed | Cheongju National University of Education
Type: Journal Article | Journal: Mycobiology | Year: 2016

Arbuscular mycorrhizal fungi (AMF) are ubiquitous in the rhizosphere and form symbiotic relationships with most terrestrial plant roots. In this study, four strains of Rhizophagus clarus were cultured and variations in their growth characteristics owing to functional diversity and resultant effects on host plant were investigated. Growth characteristics of the studied R. clarus strains varied significantly, suggesting that AMF retain high genetic variability at the intraspecies level despite asexual lineage. Furthermore, host plant growth response to the R. clarus strains showed that genetic variability in AMF could cause significant differences in the growth of the host plant, which prefers particular genetic types of fungal strains. These results suggest that the intraspecific genetic diversity of AMF could be result of similar selective pressure and may be expressed at a functional level.

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