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A Flexible Power and Delay Modeling and Optimization for Small Size Systems Operated by Battery
Tatsuya Koyagi,Masahiro Fukui,Resve Saleh 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Due to the rapid popularization of portable equipments, a goal for designer becomes to make the battery lifetime longer without increasing the total system size. Especially for ubiquitous computing age, long battery lifetime in a tight size limitation will be required. A new flexible power and delay modeling for LSI are proposed in this paper. These models help the optimization for small size systems, is proposed in, to be more accurate and useful. The result of the optimization is shown in this paper.
A New Approach for Accurate RTL Power Macro-Modeling
Kawauchi, Hirofumi,Taniguchi, Ittetsu,Fukui, Masahiro The Institute of Electronics and Information Engin 2010 Journal of semiconductor technology and science Vol.10 No.1
Register transfer level power macromodeling is well known as a promising technique for accurate and efficient power estimation. This paper proposes effective approaches based on the tablebased method for the RTL power macro-modeling. The new parameter SD, which characterizes the distribution of switching activities for each gate in the circuit, is one of the contributions. The new parameter SD has strong correlation with power consumption. We also propose an accurate table reference method considering the circuit characteristics. The table reference method is applicable for every table-based method and outputs more accurate power value. The experimental results show that the combination of the proposed methods reduces max error 30.36% in the best case, comparing conventional methods. The RMS error is also improved 1.70% in the best case.
A New Approach for Accurate RTL Power Macro-Modeling
Hirofumi Kawauchi,Ittetsu Taniguchi,Masahiro Fukui 대한전자공학회 2010 Journal of semiconductor technology and science Vol.10 No.1
Register transfer level power macromodeling is well known as a promising technique for accurate and efficient power estimation. This paper proposes effective approaches based on the tablebased method for the RTL power macro-modeling. The new parameter SD, which characterizes the distribution of switching activities for each gate in the circuit, is one of the contributions. The new parameter SD has strong correlation with power consumption. We also propose an accurate table reference method considering the circuit characteristics. The table reference method is applicable for every table-based method and outputs more accurate power value. The experimental results show that the combination of the proposed methods reduces max error 30.36% in the best case, comparing conventional methods. The RMS error is also improved 1.70% in the best case.
STM TIP-CURRENT-INDUCED POLYMERIZATION OF C60, Ce2@C80 AND Lu2@C76
HISANORI SHINOHARA,KAZUNORI OHASHI,NOBUYUKI FUKUI,MASAHIRO AKACHI,TAKAO AKACHI,HISASHI UMEMOTO,YASUHIRO ITO,TOSHIKI SUGAI,RYO KITAURA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.5
Polymerization of C60, Ce2@C80, and Lu2@C76 metallofullerenes induced by electron injection from a scanning tunneling microscope (STM) tip has been studied. C60 polymerization has been observed only with C60 multilayer on Au(111) and not with C60 monolayer on Au(111). The Ce2@C80 metallofullerene on Si(111)-7 × 7 also polymerizes by electron injection but has less polymerization reactivity than C60. Interestingly, the Lu2@C76 metallofullerene on Si(111)-7 × 7 does not show any polymerization. Based on these STM observations on the tip-induced polymerization, the direction of the bond formation and the dependence of reactivity on the kind of fullerenes are discussed.
A Practical Battery Charge/Discharge Simulator for Portable System Design
Keita KOJIMA,Sayaka IWAKOSHI,Ittetsu TANIGUCHI,Masahiro FUKUI 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Accompanying with the rapid popularization of portable embedded systems, the battery technology continues remarkable improvement to achieve low-cost and long battery life. This paper proposes a practical battery simulator which enables simulation of the battery charge/discharge behavior considering characteristics of the battery such as electro chemical diffusion and voltage decline due to inner resistances, and the experimental result in realistic condition is also discussed.
A Massively Parallel Circuit Simulator for Power Grids Analysis
Hisako SUGANO,Yuuya ISODA,Makoto YOKOTA,Ittetsu TANIGUCHI,Masaya YOSHIKAWA,Masahiro FUKUI 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
With the shrinking of patterns in VLSIs, it becomes hard to neglect those problems related to IR-drop, electro migration, and so on. It takes huge calculation time to analyze and optimize these issues. The GPU computation is one of the expected approaches, since the innovation of the GPU is much faster than the CPU. The algorithm utilizes shared memories as much as possible to reduce to total computation time. The experimental results show that it achieves 15 times fast computation than CPU with similar accuracy.
A New Approach for RTL Power Macro-Modeling
Hirofumi KAWAUCHI,Toshio MORIKAWA,Ryohei MURASHIMA,Ittetsu TANIGUCHI,Masahiro FUKUI 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper presents a new power macro-modeling technique for resister transfer level (RTL). RTL power macro-modeling technique is well known as promising technique for fast power estimation. Our method is based on a table look-up constructed by statistical information extracted from the primary inputs to the circuit. In this paper, we propose a novel power estimation method with a new parameter SD. This parameter characterizes switching activity of an internal circuit. The switching activities of each gate are strongly related with the power consumption. Experimental results show that the proposed method improves RMS error about 10% in average with the ISCAS-85 combinational circuits. The average RMS error of our model was 4.5%.