Most smartphones employ Li-ion(or Li-polymer)batteries as their power sources.Though battery consumption significantly varies along with the cell temperature,which is severely affected by ambient temperature,many stud...Most smartphones employ Li-ion(or Li-polymer)batteries as their power sources.Though battery consumption significantly varies along with the cell temperature,which is severely affected by ambient temperature,many studies simply assume that the cell temperature is equal to room temperature.Furthermore,there has not been any study that has quantitatively analysed the impact of ambient temperature on battery consumption.In this paper,it can be shown that low ambient temperature significantly affects battery consumption of a smartphone.To show the impact of the cell temperature on battery consumption,the battery consumption at low ambient temperature(-20℃)is compared with that at room temperature.As a result,high power consumption results in more severe battery consumption at low ambient temperature.Real measurements show that the battery consumption increases by up to 113.1%at low ambient temperature in comparison with the same discharge condition at room temperature.展开更多
In this paper, we propose a fast and simple system emulator, called a system performance emulator(SPE), to evaluate long read operations.The SPE estimates how much system-wide performance is enhanced by using a faster...In this paper, we propose a fast and simple system emulator, called a system performance emulator(SPE), to evaluate long read operations.The SPE estimates how much system-wide performance is enhanced by using a faster solid state disk(SSD).By suspending a CPU for a certain time during direct memory access(DMA) transfer and subtracting this suspended time from the total DMA time, the SPE estimates the improvement in system performance expected from an enhanced SSD prior to its manufacture.We also examine the relation between storage performance and system performance using the SPE.展开更多
基金The MKE(Ministry of Knowledge Economy),Korea,under the ITRC(Information Technology Research Center)support program supervised by the NIPA(National IT Industry Promotion Agency)(NIPA-2013-H0301-13-2006)The National Research Foundation of Korea(NRF)grant funded by the Korea government(MEST)(NRF2012R1A2A2A01013816)
文摘Most smartphones employ Li-ion(or Li-polymer)batteries as their power sources.Though battery consumption significantly varies along with the cell temperature,which is severely affected by ambient temperature,many studies simply assume that the cell temperature is equal to room temperature.Furthermore,there has not been any study that has quantitatively analysed the impact of ambient temperature on battery consumption.In this paper,it can be shown that low ambient temperature significantly affects battery consumption of a smartphone.To show the impact of the cell temperature on battery consumption,the battery consumption at low ambient temperature(-20℃)is compared with that at room temperature.As a result,high power consumption results in more severe battery consumption at low ambient temperature.Real measurements show that the battery consumption increases by up to 113.1%at low ambient temperature in comparison with the same discharge condition at room temperature.
基金Project supported by the Second Brain Korea 21 Project and Samsung Electronics
文摘In this paper, we propose a fast and simple system emulator, called a system performance emulator(SPE), to evaluate long read operations.The SPE estimates how much system-wide performance is enhanced by using a faster solid state disk(SSD).By suspending a CPU for a certain time during direct memory access(DMA) transfer and subtracting this suspended time from the total DMA time, the SPE estimates the improvement in system performance expected from an enhanced SSD prior to its manufacture.We also examine the relation between storage performance and system performance using the SPE.
