• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.01a
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• pp.755-759
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• 2009

This paper proposes an HDR display system using multi-projectors for presentation of HDR contents to multi-users. An HDR image is resolved by luminance and the resolved images are assigned to several projectors. The proposed system projects the HDR contents onto a large screen, and the system can display the HDR contents to multi-users. The proposed system realized to output the broad luminance by emitting the light of multi-projectors onto the same screen. In addition, tonal steps of the proposed system increase so that other projectors cover the tonal steps in the region where the dynamic range is expanded. In this paper, we indicate an effectiveness of the proposed system.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.16 no.1
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• pp.75-90
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• 2005

Information literacy has been defined as "the ability to access, evaluate, and use information from a variety of sources." Recently, information literacy has become a hot topic in Korean education circles and school library fields, but few publications describe how to assess information literacy skills. This study is the first stage to develop a measurable assessment tool of the information literacy skills of korean high school students. In this paper, related projects, curricular models, and rubrics are reviewed and an assessment tool is suggested. This tool will be field-tested and revised on the results in the near future.

• Current Photovoltaic Research
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• v.1 no.2
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• pp.73-81
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• 2013

Heterojunction with Intrinsic Thin-layer (HIT) solar cells are currently an important subject in industrial trends for thinner solar cell wafers due to the low-temperature of production processes, which is around $200^{\circ}C$, and due to their high-efficiency of 24.7%, as reported by the Panasonic (Sanyo) group. The use of thinner wafers and the enhancement of cell performance with fabrication at low temperature have been special interests of the researchers. The fundamental understanding of the band bending structures, choice of materials, fabrication process, and nano-scale characterization methods to provide necessary understanding of the interface passivation mechanisms, emitter properties, and requirements for transparent oxide conductive layers is presented in this review. This information should be used for the performance characterization of the developing technologies for HIT solar cells.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.28 no.2
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• pp.157-183
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• 2017

The purpose of this study is to present the effects of a bibliotheraphy program using picture books on school adaptation of maladjusted high school students. The first and second year students of P High School that is located in Yongin city of Gyeonggi Do, bibliotherapy research using picture books has been carried out with 11 maladjusted students in school life. According to the analysis results is as follows. The bibliotherapy program using picture books turned out to be effective in adaptation ability ane sub-domains of adaptation ability such as teacher relationship, peer relationship, school class and school regulation of maladjusted students in school life.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.4
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• pp.1866-1883
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• 2019

As the youngest branch of information hiding, network covert timing channels conceal the existence of secret messages by manipulating the timing information of the overt traffic. The popular model-based framework for constructing covert timing channels always utilizes cumulative distribution function (CDF) of the inter-packet delays (IPDs) to modulate secret messages, whereas discards high-order statistics of the IPDs completely. The consequence is the vulnerability to high-order statistical tests, e.g., entropy test. In this study, a rich security model of covert timing channels is established based on IPD chains, which can be used to measure the distortion of multi-order timing statistics of a covert timing channel. To achieve rich security, we propose two types of covert timing channels based on nested lattices. The CDF of the IPDs is used to construct dot-lattice and interval-lattice for quantization, which can ensure the cell density of the lattice consistent with the joint distribution of the IPDs. Furthermore, compensative quantization and guard band strategy are employed to eliminate the regularity and enhance the robustness, respectively. Experimental results on real traffic show that the proposed schemes are rich-secure, and robust to channel interference, whereas some state-of-the-art covert timing channels cannot evade detection under the rich security model.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.4
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• pp.1689-1703
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• 2020

When data is transmitted over an unreliable channel, the error of the data packet may result in serious degradation. The multiple description coding (MDC) can solve this problem and save transmission costs. In this paper, we propose a deep multiple description coding network (MDCN) to realize efficient image compression. Firstly, our network framework is based on convolutional auto-encoder (CAE), which include multiple description encoder network (MDEN) and multiple description decoder network (MDDN). Secondly, in order to obtain high-quality reconstructed images at low bit rates, the encoding network and decoding network are integrated into an end-to-end compression framework. Thirdly, the multiple description decoder network includes side decoder network and central decoder network. When the decoder receives only one of the two multiple description code streams, side decoder network is used to obtain side reconstructed image of acceptable quality. When two descriptions are received, the high quality reconstructed image is obtained. In addition, instead of quantization with additive uniform noise, and SSIM loss and distance loss combine to train multiple description encoder networks to ensure that they can share structural information. Experimental results show that the proposed framework performs better than traditional multiple description coding methods.

• Journal of Korean Library and Information Science Society
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• v.46 no.3
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• pp.201-224
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• 2015

This study analyzes the influences on the reading flow, reading satisfaction, and continuous willingness to read books for parents, teachers, and friends as a reading role model to influence high school students and the differences in the personal characteristics; gender, disciplines, and grade. The result shows that the most important contributor for high school students' reading is friends and male students are more influenced by their friends than female students. In addition, students in vocational high school are more influenced by their friends than students in academic high school. Parents factor relatively affects the reading for male students, 3rd grade students in high school, and students in academic high school. On the other hand, teachers barely affect the reading factors for students.

• Journal of Gifted/Talented Education
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• v.25 no.2
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• pp.339-358
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• 2015

This study was to examine perceptions of information technology(IT) competencies among gifted and non-gifted students(i.e., information science high school students and technical high school students). Of the 370 high school students surveyed from 3 high schools(i.e., gifted academy, information science high school, and technical high school) in three metropolitan cities, Korea, 351 students completed and returned the questionnaires yielding a total response rate of 94.86%. High school students recognized the IT professional competence as being most important when recruiting IT employees. And they considered that practice-oriented education was the most importantly needed to improve their IT skills. In addition, the most important sub-factors of IT core competencies among gifted academy students and information science high school students were basic software skills. Also Technical high school students responded that the main network and security capabilities were the most importantly needed to do so. Finally, the most appropriate training courses for enhancing IT competencies were recognized differently among gifted and non-gifted students. Gifted academy students responded that the 'algorithm' was the mostly needed for enhancing IT competencies, whereas information science high school students responded that 'data structures' and 'computer architecture' were mostly needed to do. For technical high school students, they responded that a 'programming language' course was the most needed to do so. Results are discussed in relations to IT corporate and school settings.

• Journal of Korean Library and Information Science Society
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• v.46 no.4
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• pp.599-620
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• 2015

The purpose of this study was to examine effects of writing future autobiography program using information activities in school library on improving high school students' ego-identity. This study was conducted 198 high school students in grade 2. Writing an autobiography using information activities in library was conducted 15 times in total, once a week for 50 minutes, and students had done information activities to get to know about themselves and their own lives and they wrote their future autobiography based on those activities. Then they made their own books. As a result of analyzing the change of students' ego-identity before and after writing the future autobiography through t-test, it turned out that there were some meaningful differences.

• Journal of The Korean Association For Science Education
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• v.19 no.1
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• pp.100-106
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• 1999

The purpose of this study was to incorporate STS education into science education field by investigating high school science teachers' perceptions about inservice STS education program and suggesting the methods of improvement for it. The subjects consisted of 227 high school science teachers who attended at inservice program on general science and were shortly taught about STS education. Results from trachers' data indicated that high school science teachers perceived of the importance of STS education and showed willingness to attend at the inservice STS education program when it was opened. Above all. they wanted to get the materials and information related STS at the program.