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전체 선택해제
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본문검색 결과만 보기
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시공간 화질의 절충을 고려한 MPEG-4 비트율 제어 알고리즘
이정우, 호요성, Lee. Jeong-Woo, Ho. Yo-Sung 대한전자공학회 電子工學會論文誌. Journal of the Institute of Electronics Engineers of Korea. SP, 신호처리 10 Pages
대한전자공학회 電子工學會論文誌. Journal of the Institute of Electronics Engineers of Korea. SP, 신호처리 2004, Vol.41 No.1 47-56 (10 pages)
본 논문에서는 여러 개의 비디오 객체를 부호화할 때 기존의 MPEC-4 VM5알고리즘에 비해 부호화 성능을 향상시키면서 고정 비트율을 지원하는 새로운 알고리즘을 기술한다. 특히, 부호화되는 객체와 건너뛰어지는 객체의 왜곡을 예측하는 비트율-왜곡 모델을 제시하고, 부호화 성능을 향상시키기 위해 시간적-공간적 절충을 고려한 부호화 모드와 버퍼를 제어하는 방법을 제안한다. 본 논문에서 제안된 객체 기반의 비트율 제어 방법은 넓은 범위의 비트율에서 향상된 성능을 보이며, 목표 비트율에 근접한 압축 비트열을 발생하고, 버퍼... -
Socio-Economic and Political Changes and the Cultural Hybridization of Early Childhood Education and Care since South Korean Independence in 1945
Seonghwan Kim, Mary McMullen 환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 22 Pages
환태평양유아교육연구학회 Asia-Pacific journal of research in early childhood education 2021, Vol.15 No.2 12 257-278 (22 pages)
South Korean ECEC has been transformed by dynamic socio-economic and political changes. In these changes, the Korean culture as it is embedded in ECEC is continuously being retranslated and reshaped in the new, and ever-changing context by means of globalization and from those who travel abroad and bring back new ideas. Previous research is limited in that it fails to connect broader Korean cultural and societal changes to changes in ECEC over time. In this paper we illustrate the history of... -
Synthesis and characterization of carbon doped TiO₂ photocatalysts supported on stainless steel mesh by sol-gel method
JO. Tijani, OO. Fatoba, TC. Totito, WD. Roos, LF. Petrik 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 6 48-59 (12 pages)
This study synthesized pure anatase carbon doped TiO₂ photocatalysts supported on a stainless steel mesh using a sol-gel solution of 8% polyacrylonitrile (PAN)/dimethylformamide (DMF)/TiCl₄. The influence of the pyrolysis temperature and holding time on the morphological characteristics, particle sizes and surface area of the prepared catalyst was investigated. The prepared catalysts were characterized by several analytical methods: high resolution scanning electron microscopy (HRSEM), energy... -
Biocomposite membranes based on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and multiwall carbon nanotubes for gas separation
Mongyoung Huh, Hye Min Lee, Young Soo Park, Seok Il Yun 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 17 116-121 (6 pages)
The development of gas separation membranes is currently an active research area because of the rapidly increasing interest in carbon dioxide capture and hydrogen recovery, which are two of the most important solutions for problems related to energy and the environment [1-4]. Polymer membranes show selectivity in the separation of gases due to differences in the permeability of individual gases through the polymer film [3,4]. Even though advantageous in terms of low cost, the segmental... -
Effects of maleic anhydride content on mechanical properties of carbon fibers-reinforced maleic anhydride-grafted-polypropylene matrix composites
Hyun-Il Kim, Woong Han, Woong-Ki Choi, Soo-Jin Park, Kay-Hyeok An, Byung-Joo Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2016, Vol.20 6 39-46 (8 pages)
In this work, the effects of maleic anhydride (MA) content on mechanical properties of chopped carbon fibers (CFs)-reinforced MA-grafted-polypropylene (MAPP) matrix composites. A direct oxyfluorination on CF surfaces was applied to increase the interfacial strength between the CFs and MAPP matrix. The mechanical properties of the CFs/MAPP composites are likely to be different in terms of MA content. Surface characteristics were observed by scanning electron microscope, Fourier transform infrared... -
Double-walled carbon nanotubes: synthesis, structural characterization, and application
Yoong Ahm Kim, Kap-Seung Yang, Hiroyuki Muramatsu, Takuya Hayashi, Morinobu Endo, Mauricio Terrones, Mildred S. Dresselhaus 한국탄소학회 Carbon Letters 12 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.2 4 77-88 (12 pages)
Double walled carbon nanotubes (DWCNTs) are considered an ideal model for studying the coupling interactions between different concentric shells in multi-walled CNTs. Due to their intrinsic coaxial structures they are mechanically, thermally, and structurally more stable than single walled CNTs. Geometrically, owing to the buffer-like function of the outer tubes in DWCNTs, the inner tubes exhibit exciting transport and optical properties that lend them promise in the fabrication of field-effect... -
Microwave heating of carbon-based solid materials
Teawon Kim, Jaegeun Lee, Kun Hong Lee 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.1 2 15-24 (10 pages)
As a part of the electromagnetic spectrum, microwaves heat materials fast and efficiently via direct energy transfer, while conventional heating methods rely on conduction and convection. To date, the use of microwave heating in the research of carbon-based materials has been mainly limited to liquid solutions. However, more rapid and efficient heating is possible in electron-rich solid materials, because the target materials absorb the energy of microwaves effectively and exclusively....
