• Korean journal of communication and information
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• v.66
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• pp.110-132
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• 2014

This study attempts to redefine the concept of 'fairness' of Korean public broadcasting and tries to build a new model for evaluating the fairness of Korean public broadcasting. The author insists that the fairness in public broadcasting consists of binary components of the public and rightful reporting, and views that the public reporting represents of neutralness, balance and impartiality while the rightful reporting represents of factuality, multiplicity and the protection of social minorities. The author suggests that two criteria of the public and rightful reporting results in four models of 'shepherd', 'acrobat', 'tribune', and 'trumpeter' in accord with its focus on the public and the rightful reporting. Survey toward the professionals in public broadcasting in academia was conducted and addressed the fact that Korean public broadcasting is close to the trumpeter model with some feature of acrobat.

• Journal of the KSME
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• v.53 no.12
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• pp.45-48
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• 2013

이 글에서는 현재 연세대학교 기계공학과의 나노물리개론 교과목에 대해 소개하고자 한다. 최근 첨단 분야로 각광받고 있는 나노테크놀로지를 이해하기 위해서 요구되는 나노 세계의 기본 개념과 양자역학적인 현상기술들을 기계공학 전공자들이 쉽게 이해할 수 있도록 설명하고 현재 기계공학 연구에 어떻게 적용되는지 다양한 예를 통하여 알아본다.

• Proceedings of the Optical Society of Korea Conference
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• 2008.02a
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• pp.229-230
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• 2008

• Transactions of the Korean hydrogen and new energy society
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• v.32 no.6
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• pp.656-662
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• 2021

For the high efficiencies of quantum dot-sensitized solar cells (QDSCs), it is important to control the severe electron recombination at the interface of photoanode/electrolyte. In this work, we optimize the surface passivation process of ZnS/SiO₂ double overlayers for the enhanced photovoltaic performances of QDSCs. The overlayers of zinc sulfide (ZnS) and SiO₂ are coated on the surface of QD-sensitized photoanode by successive ionic layer adsorption and reaction (SILAR) method, and sol-gel reaction, respectively. In particular, for the sol-gel reaction of SiO₂, the influences of temperature of precursor solution are investigated. By application of SiO₂ overlayers on the ZnS-coated photoanode, the conversion efficiency of QDSCs is increased from 5.04% to 7.35%. The impedance analysis reveals that the electron recombination at the interface of photoanode/electrolyte is obviously reduced by the SiO₂ overlayers.

• Transactions of the Korean hydrogen and new energy society
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• v.32 no.6
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• pp.663-668
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• 2021

For the development of highly efficient quantum dot-sensitized solar cells (QDSCs), it is important to enhance the electrocatalytic activity of the counter electrodes (CEs). Herein, a fabrication process of Cu₂S CEs are optimized for the development highly efficient QDSCs. The surface of brass film is treated with HCl solution to prepare the Cu₂S CEs, and the concentraion as well as the temperature of HCl solution are controlled. It is found that the uniformity for the thickness of prepared Cu₂S CEs is enhanced when the diluted HCl solution is used, compared to the HCl solution of standard concentration. In addition, the electrocatalytic activity of the Cu₂S CEs is also increased with the modificed process, which is confirmed by impedance data and Tafel polarization curves. As a result, the photoconversion efficiency of QDSCs is improved from 4.49% up to 5.73%, when the concentraion and temperature of the HCl treatment are efficiently optimized.

• Transactions of the Korean hydrogen and new energy society
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• v.33 no.1
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• pp.113-120
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• 2022

Quantum dots (QDs) are attractive photosensitizer candidates for application not only in solar cells but also in solar hydrogen generation. For the prepartion of highly efficient QD-sensitized photoelectrodes, it is important to reduce electron recombination at the photoanode/electrolyte interface. Here, we study on the coating condition of ZnS passivation layers on the photoanodes in QD-sensitized solar cells (QDSCs). The ZnS passivation layers are coated by successive ionic layer adsorption and reaction method, and as the cation precursor, zinc acetate and zinc nitrate are empolyed. Due to the higher pH of cation precursor solution, the ZnS loading is improved when the zinc acetate is used, compared to the zinc nitrate. This improved loading of ZnS leads to the reduced electron recombination at the surface of photoanodes and the enhaced conversion efficiency of QDSCs from 6.07% to 7.45%.

• Journal of the Korean Geographical Society
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• v.48 no.2
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• pp.288-302
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• 2013

This paper aims to compare and analyze the undergraduate geography curriculums of Korean and American universities. is rarely offered as an undergraduate geography subject in both Korean and American universities. This may be due to the fact that the four fields of geography(human geography field, physical geography field, regional geography field, and other geography field) are not easily able to be integrated and taught as an independent geography subject. The ratio of the subject number of human geography field(39.4%) is greater than that of physical geography field(24.5%) at the geography departments of Korean universities, but the ratio of the subject number of physical geography field(32.8%) is a little more greater than that of human geography field(29.4%) at the geography departments of American universities. The ratio of the subject number of regional geography fields at the geography department of American universities(18.1%) is greater than that of Korean universities(13.8%), so more stress seems to be laid on the field of regional geography in American universities than in Korean universities. Although the geography curriculums of Korean universities seems to follow generally those of American universities, this paper reveals that there is also differences between the geography curriculums of Korean and American universities in terms of their emphasis on four fields of geography. The differences could be explained by the historical context of the geography departments of Korean universities during the last half a century.

• Journal of Broadcast Engineering
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• v.20 no.2
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• pp.224-237
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• 2015

In this paper, we introduce the fast decoding method with the SIMD (Single Instruction Multiple Data) instructions for HEVC RExt (High Efficiency Video Coding Range Extensions). Several tools of HEVC RExt such as intra prediction, interpolation, inverse-quantization, inverse-transform, and clipping modules can be classified as the proper modules for applying the SIMD instructions. In consideration of bit-depth increasement of RExt, intra prediction, interpolation, inverse-quantization, inverse-transform, and clipping modules are accelerated by SSE (Streaming SIMD Extension) instructions. In addition, we propose effective implementations for interpolation filter, inverse-quantization, and clipping modules by utilizing a set of AVX2 (Advanced Vector eXtension 2) instructions that can use 256 bits register. The evaluation of the proposed methods were performed on the private HEVC RExt decoder developed based on HM 16.0. The experimental results show that the developed RExt decoder reduces 12% average decoding time, compared with the conventional sequential method.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.05a
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• pp.1328-1333
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• 2006

For fault diagnosis of machines and equipments, knowledge-based method has been used widely but has some limitations for complex systems. These can be covered by model-based method. As one kind of model-based method, Qualitative modeling diagnosis method is developed in this research. The developed method uses output signal only. In this method quantization of the output signal mattes automata which can characterize the flow of the signal pattern to normal and fault respectively. As an example of the qualitative diagnosis method, an electric tool which has faults at gear and bearing were examined in this research. The result shows that the developed method can diagnose the fault clearly for the two fault cases.

• Korean Journal of Ichthyology
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• v.6 no.2
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• pp.172-192
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• 1994

The fish fauna from the Yellow Sea was reviewed based on the published materials from Korea and China. As a results, author confirmed 389 species belonging to 257 genera, 123 families and 27 orders. Among them, the ascertained species in the western coast of Korean were 233 species belonging to 161 genera, 80 families and 20 orders, and those distributed in the Chinese water were 300 species belonging to 213 genera, 115 families and 27 orders. The largest fish group in this area was order Perciformes having 164 species belonging to 114 genera and 51 families, followed by order Scorpaeniformes comprising 45 species belong to 27 genera and 11 families, and order Pleuronectiformes having 34 species belong to 24 genera and 5 families. The important species in Korea economically were families Rajidae, Anguillidae, Clupeidae, Engraulidae, Scorpaenidae, Serranidae, Platycephalidae, Sciaenidae, Mugilidae, Trichiruridae, Stromateidae, Cynoglossidae, Pleuronectidae, Tetraodontidae. There were 9 endemic species in the westernsea of Korea : Neosalanx jordani, Pseudosciaena poliactis, Repomucenus koreanus, Repomucenus leucopoecilus, Achanthogobius elongata, Scartelaos sp., Cynoglossus joyneri, Takifugu flavidus and Takifugu obscurus.