• Transactions on Semiconductor Engineering
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• v.2 no.4
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• pp.78-83
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• 2024

As the integration of multiple systems into a single chip increases, on-chip bus power consumption has become a significant concern, necessitating strategies to reduce it. In contrast, off-chip environments requiring reduced energy consumption on buses primarily utilize the Data Bus Inversion (DBI) technique. DBI is a data encoding method that reduces switching activity, achieving an average reduction of 18.25% in switching activity and effectively lowering total energy consumption in off-chip applications. However, applying conventional DBI on-chip leads to energy overhead issues, highlighting the need for a novel DBI encoder tailored to on-chip environments. This paper proposes an approximate DBI encoder that incorporates approximate computation into the majority voter circuit, a key component of the DBI encoder, to address the energy overhead issue. The DBI technique using the two proposed approximate majority voter circuits reduces average switching activity by 5.75% and 10.50%, respectively. While the approximate computation results in a slight increase in switching activity compared to the conventional DBI, it achieves an average reduction of approximately 20% in delay time and around 56% in power consumption.

• Journal of IKEEE
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• v.16 no.3
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• pp.274-282
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• 2012

In this paper, we propose the design of lighting control algorithm for intelligent LED lighting system. The proposed lighting control algorithm transmitted to MCU through a data bus the environmental information detected from respectively sensor node. The MCU control software was designed to determine the level maintained to depending on the set control method by comparing the results that calculated the dimming level using a signal value. Also, it was designed to be lighting by cross-performed periodically the rotation and reverse method by created fully symmetrical pattern using the control algorithm to LED lighting device. In this paper, the proposed lighting control algorithm improved the reliability of the data sent by designed the system that can be controlled lighting to stable, and it was maintained the event delivery ratio of 91%. Also, the lighting device was decreased the luminous intensity of 32%, the power consumption of 49%, and heat generation of 32%. As a result, it were could be improved the energy efficiency that the life-cycle of LED has been increased 50%.