Browsing by Author "Wang, Po-Han"

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A Latency-Elastic and Fault-Tolerant Cache for Improving Performance and Reliability on Low Voltage Operation
(2015)
Yu, Yung-Hui
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Wang, Po-Han
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Tsai, Shang-Jen
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Chen, Tien-Fu
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資訊工程學系
The ever-increasing transistor threshold-voltage (Vth) variation caused by process technologies shrink brings the performance and reliability issues in SRAM cells. To keep power limitations, scaling down the supply voltage is inevitable in mobile devices and future chips. However, caches become susceptible even fail in low voltages, and the distribution of access latencies increases in new technology nodes. To deal with the respectable power of SRAM in modern processors, the memory reliability wall poses a major challenge in cache design nowadays and continues for years to come. This thesis proposes a latency-elastic and fault-tolerant cache not only for fault tolerant, but aiming at the performance issues. It varies the latency of cache access to achieve better-than-worst-case designs for improving performance.
Analyzing OpenCL 2.0 Workloads Using a Heterogeneous CPU-GPU Simulator
(2017-01-01)
Wang, Li
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Tsai, Ren-Wei
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Wang, Shao-Chung
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Chen, Kun-Chih
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Wang, Po-Han
Heterogeneous CPU-GPU systems have recently emerged as an energy-efficient computing platform. A robust integrated CPU-GPU simulator is essential to facilitate researches in this direction. While few integrated CPU-GPU simulators are available, similar tools that support OpenCL 2.0, a widely used new standard with promising heterogeneous computing features, are currently missing. In this paper, we extend the existing integrated CPU-GPU simulator, gem5-gpu, to support OpenCL 2.0. In addition, we conduct experiments on the extended simulator to see the impact of new features introduced by OpenCL 2.0. Our OpenCL 2.0 compatible simulator is successfully validated against a state-of-the-art commercial product, and is expected to help boost future studies in heterogeneous CPU-GPU systems.
High-performance graphene-based heaters fabricated using maskless ultraviolet laser patterning
(2019-06-01)
Tseng, Shih-Feng
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Cheng, Pi-Ying
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Hsiao, Wen-Tse
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Chen, Ming-Fu
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Chung, Chien-Kai
Graphene-based film heaters (GFHs) with laser-patterned electrode structures can be used in microheaters, thermal sensors, and thermostatic apparatuses for various high-value-added medical devices and creative products. To obtain uniform and higher temperatures, this study aims to design, fabricate, and measure GFHs with net-like electrode structures using ANSYS Workbench software, an ultraviolet laser processing system, and an infrared thermal imaging camera, respectively. The electric heating experiments (which were measured with an infrared thermal imaging camera) demonstrated that the temperatures of GFHs with net-like electrode structures were significantly higher than those of devices without patterned graphene films. Moreover, the temperatures of GFHs with net-like electrode structures increased rapidly with time when DC voltages higher than 12V were applied for at least 10s. A maximum temperature of 91.5 degrees C was obtained at 200s when a DC voltage of 18V was applied. Besides, minimal and maximal deviations of steady-state temperatures between experimental and simulated values were 6.9 degrees C and 10 degrees C under each corresponding DC voltage, respectively.