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Wire Optimization and Delay Reduction for High-Performance on-Chip Interconnection in GALS Systems
오명훈,김영우,김학영,김영균,김진성 한국전자통신연구원 2017 ETRI Journal Vol.39 No.4
To address the wire complexity problem in large-scale globally asynchronous, locally synchronous systems, a current-mode ternary encoding scheme was devised for a two-phase asynchronous protocol. However, for data transmission through a very long wire, few studies have been conducted on reducing the long propagation delay in current-mode circuits. Hence, this paper proposes a current steering logic (CSL) that is able to minimize the long delay for the devised current-mode ternary encoding scheme. The CSL creates pulse signals that charge or discharge the output signal in advance for a short period of time, and as a result, helps prevent a slack in the current signals. The encoder and decoder circuits employing the CSL are implemented using 0.25-μm CMOS technology. The results of an HSPICE simulation show that the normal and optimal mode operations of the CSL achieve a delay reduction of 11.8% and 28.1%, respectively, when compared to the original scheme for a 10-mm wire. They also reduce the power-delay product by 9.6% and 22.5%, respectively, at a data rate of 100 Mb/s for the same wire length.
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Chitosan assisted synthesis of LiFePO4/Graphene/C composite and its electrochemical performance
Qiru Li, Zhufa Zhou,Xingxing Zhang,ShanShan Liu 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.5
LiFePO4/graphene/C composite was prepared using chitosan (CS) and graphene oxide (GO) as carbon sources via a facile solidstate method. CS can bond with GO through electrostatic force between amino group on CS and carboxy group on GO. Withhigh temperature treatment, GO can be reduced to graphene and CS can be decomposed into carbon. By adding chitosan,severe agglomeration of graphene can be prevented. As a result, a continuous conductive framework was formed. The goodconductivity facilitates electron migration, contributing to excellent electrochemical performance especially the high-rateperformance. Consequently, the composite LiFePO4/graphene/C exhibited higher initial discharge capacity of 145.2 mAh • g−1atthe low rate of 0.1 C and retained 62.6 mAh • g−1at high rate of 10 C, while the LiFePO4 merely coated with graphene (LFP/G) was 125.9 mAh • g−1(0.1 C) and 6.5 mAh • g−1(10 C), respectively.
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최홍준(HongJun Choi),전형규(HyungGyu Jeon),김철홍(Cheolhong Kim) 한국정보과학회 2012 정보과학회 컴퓨팅의 실제 논문지 Vol.18 No.4
최근, GPU 성능이 급속도로 향상되면서 CPU를 대체할 수 있는 처리기로서의 GPU에 대한 관심이 더욱 높아지고 있다. GPU의 성능은 현재까지는 비약적으로 향상되어 왔지만, 향후에도 지속적인 성능 향상을 기대하기 위해서는 GPU의 성능에 부정적인 영향을 주고 있는 요인들에 대한 상세한 분석이 수반되어야 한다. 이를 위해, 본 논문에서는 고성능 상용 GPU의 성능에 부정적인 영향을 미치는 요인들을 크게 5가지로 분류하고, 각각의 요인들이 성능에 미치는 영향을 정량적으로 분석하고자 한다. 실험 결과에 의하면, 대용량 데이터 처리 응용프로그램을 GPU에서 수행하는 경우에는 메모리 오버헤드로 인해 성능이 최대 12.6% 저하된다. 연산 집중 응용프로그램을 수행하는 경우에는 내부연결망 지연과 레지스터 파일 충돌 때문에 발생하는 오버헤드로 인해 3.5%의 성능이 저하됨을 알 수 있다. The performance of Graphic Processing Unit (GPU) has been improved dramatically. To improve the GPU performance continuously, a quantitative analysis on the various factors which degrade the GPU performance should be provided. In this paper, we divide the negative factors on the GPU performance into five types and analyze the impact of each factor quantitatively. According to our experimental results using GPGPU-SIM, memory overhead degrades the GPU performance by 12.6% when the mass-data applications are executed. In cases that computation-intensive applications are executed, the degradation of GPU performance caused by the interconnection overhead and register file overhead is measured as 3.5%.
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Surendar Vadivel,Uthandipalayam Subramaniyam Ragupathy 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
This paper proposes a bidirectional Z-source dc-dc converter topology for the optimal utilization ofrenewable energy sources to the microgrid with the proposed control technique. Compared to the existing dc-dcconverter circuits, they can reduce in-rush and harmonic current, provide larger range of output dc voltage andimprove reliability. It can operate in voltage-fed and current-fed when the place of the source and load is exchangedeach other, and it can be perform buck-boost function in these two conditions. Its power flow can be bidirectional. The bidirectional Z-source dc-dc converter is revealed with the consideration of enhanced converter efficiency,effective utilization of renewable energy sources and reduced switching losses. The proposed control technique isthe combination of both the grasshopper optimization algorithm (GOA) and local random search (LRS) and henceit is known as GOLRS controller. Here, the searching behaviour of the GOA is enhanced by LRS with the helpof two operators named as crossover and mutation. In the proposed technique, the GOLRS is used to generate theoptimal gain dataset based on the minimum error objective function and select the exact gain parameter of thePI controller. Batteries are used as an energy source to balance out and allow the renewable power system units tocontinue running at a steady and stable output power. The proposed technique is executed in the MATLAB/Simulinkworking platform and compared with various existing techniques.
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