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모바일 멀티미디어 응용을 위한 고에너지효율 재구성형 프로세서의 설계 및 제작
여순일(Soon-il Yeo),이재흥(Jae-Heung Lee) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.11A
모바일 멀티미디어 응용을 위한 기존의 프로세서들이 다방면에서 검증되고 응용되고 있다. 그런데, 이 모바일 멀티미디어 응용을 위해서 채택할 수 있는 하드 와이어드 즉 ASIC으로 된 칩 솔루션은 유연성이 떨어지며 비용이 많이 소요된다. 또한 유연성이 큰 CPU 솔루션은 그 성능에서 한계에 봉착하게 된다. 그러므로 ASIC 과 같은 성능과 CPU 같은 유연성 모두를 충족시키는 방법으로 재구성형 연산 프로세서를 사용하는 방법이 추천된다. 특히, 모바일 시스템들은 저전력과 고성능을 같이 추구하고 있으므로 본 논문에서는 이들을 모두 충족시키는 고에너지효율을 가지는 재구성형 프로세서를 제안한다. 130㎚ CMOS 기술에 의해 제작된 것은 121MOPS/㎽의 에너지효율을 보이며 이를 90㎚ CMOS 기술과 명령어의 효율적인 사용을 통한 재구성형 프로세서의 시뮬레이션 결과는 539MOPS/㎽의 에너지효율을 보임을 확인하였다. 또한 그 응용을 MP3의 IMDCT와 MPEG4의 DF H.264의 ME 알고리즘에 대해 시행함으로써 모바일 멀티미디어 분야에 적용될 수 있음을 보였다. Applications for mobile multimedia are testing the performance limits of present day CPUs with variety. However, hardwired solutions are inflexible and expensive to develop. CPUs with flexibity have limitation of performance. So, the requirement for both ASIC-like performance and CPU-like flexibility has led to reconfigurable processor. Mobile systems require low power and high performance concurrently. In this paper, we propose reconfigurable processor for mobile multimedia with high energy efficiency. Reconfigurable processor with 121MOPS/㎽ is developed by 130㎚ CMOS technology. And the processor was simulated for energy efficiency with 539MOPS/㎽ by 90㎚ CMOS technology and effective use of instructions. And we tested its applications for multimedia field. We tested the case of inverse MDCT for MP3 and DF for MPEG4 and ME for H.264.
Evaluation of Changes in Agricultural Stream Water Quality of Small Watershed in Chungnam Province
Yeo-Uk Yun,Jin-Il Lee,So-jin Yeob,Soon-Kun Choi 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.4
This study aimed to identify the changing trends in the agricultural water quality of the major watersheds in Chungnam Province over a 10-year period ranging from 2007 to 2016. The results of water quality analysis revealed that the mean chemical oxygen demand was 4.1 mg L<SUP>-1</SUP>, with the median values being 4.0 mg L<SUP>-1</SUP>. The result of annual CODMn of stream water showed tendency to increase. The mean and median values of EC(electrical conductivity) were 0.21 dS m<SUP>-1</SUP>and 0.19 dS m-1, respectively. The mean T-N (total nitrogen) was 2.91 mg L<SUP>-1</SUP>, with the median values being 2.47 mg L<SUP>-1</SUP>. The mean and median values of the T-P (total phosphorous) content were 0.11 mg L<SUP>-1</SUP> and 0.07 mg L<SUP>-1</SUP>, respectively.
Molten Salt Synthesis of La0.8Sr0.2MnO3 Powders for SOFC Cathode Electrode
Sin-il Gu,Hyo-soon Shin,Youn-woo Hong,Dong-hun Yeo,Jong-hee Kim,남산,윤상옥 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
For La0.8Sr0.2MnO3 (LSM) perovskite, used as the cathode material for solid oxide fuel cells (SOFC), it is known that the formation of a triple-phase-boundary is restrained due to the formation of a second phase at the YSZ/electrode interface at high temperature. To decrease the 2nd phase, lowering the sintering temperature has been used. LSM powder was synthesized by molten salt synthesis method to control its particle size, shape, and agglomeration. We have characterized the phase formation, particle size, shape, and sintering behavior of LSM in the synthesis using the variation of KCl, LiCl, KF and its mixed salts as raw materials. In the case of KCl and KCl-KF salts, the particle size and shape of the LSM was well controlled and synthesized. However, in the case of LiCl and KCl-LiCl salts, LiMnOx as 2nd phase and LSM were synthesized simultaneously. In the case of the mixed salt of KCl-KF, the growth mechanism of the LSM particle was changed from ‘diffusion-controlled’ to ‘reaction-controlled’ according to the amount of mixed salt. The sintering temperature can be decreased below 1000 °C by using the synthesized LSM powder.
The Changes of Morphology and Composition in Cu(In1-xGax)Se2 Powder Synthesis by Solvothermal Method
Sin-Il Gu,Hyo-Soon Shin,Youn-Woo Hong,Dong-Hun Yeo,남산 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
To prepare the thin film solar cell by the screen printing method, the synthesis of nano CIGS powder has been frequently studied. Especially, the solvothermal method is normally used in the synthesis of CIGS. How-ever, in the synthesis of CIGS, the experimental studies such as the path of phase formation, the composition change of synthesized CIGS, and the change of powder morphology have rarely been reported. In this study,the changes of phase and morphology of the powders were observed with the ratio of In and Ga ions and the increase of reaction temperature. The phases of CIS and CuIn0.7Ga0.3Se2 were synthesized in a = 0.1. The phase of CIS and two kinds of CIGS coexisted in the range of a = 0.3~0.7. In a = 0.9, the single phase of CuIn0.9Ga0.1Se2 was synthesized in the same ratio as the source materials. In the case of the a = 0.5 com-position, as the concentration of material source and the reaction temperature were increased, the particle size of synthesized CIGS was decreased. The CIGS particles of 200 nm size and the lower aggregate were synthesized in the concentration of 0.01 M at 230 °C.
여일연(Yeo il-yeon),김선태(Kim sun-tae),김순영(Kim soon-young),한희준(Han hee-jun),윤희준(Yoon hee-jun),예용희(Yae yong-hee) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_1
본 논문은 한국과학기술정보연구원의 해외저널 및 프로시딩 논문에 대한 국가과학기술전자도서관 NDSL에서 서비스 중인 IEEE 컨퍼런스 프로시딩 자료에 대한 DB 구축 프로세스를 개선하고 그에 따른 시스템을 구현하였다. 각 출판사에서 제공하는 원시데이터 포맷이 각각 상이하고 수시로 변경됨에 따라 NDSL에서는 그에 따른 분석과 프로그램 수정이 매번 필요하게 되고, 그 시간만큼의 서비스 지연이 발생할 수밖에 없다. 본 논문에서는 원시데이터 포맷의 변화에 따른 프로그램의 의존도를 최소화하기 위해 프로그램을 모듈화 하여 원시데이터 포맷이 변경되어도 프로그램 상에서 변화되는 부분을 최소화 하였다. This thesis improved the DB building process for IEEE conference proceedings that is being serviced in National Digital Science Library(NDSL) of KISTI and implemented the resulting system. Raw data format provided by the each publisher is different and change from time to time, so NDSL have to analyze and fix the programming. And it causes the service delays. This paper modularize the program to minimize dependence on the program due to the changes of raw data format.