Yongpeng Liu

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Due to the time-varying nature of real workload, a large scale computer system has quite a number of idle nodes in most time of operation. They consume energy, but do nothing useful. To save the huge energy waste caused by such active idle nodes, most modern compute nodes provide multiple level dynamic sleep mechanisms to reduce power consumption. However,(More)
Many energy-efficient asynchronous duty-cycle media access control (MAC) protocols for wireless sensor networks (WSNs) have been proposed in recent years. However, for burst traffic, most of them suffer from significant performance degradation due to randomly waking up to communicate with each other. In this paper, we propose a new asynchronous duty-cycle(More)
Check pointing is an effective fault tolerant technique to improve the reliability of large scale parallel computing systems. However, check pointing causes a large number of computation nodes to store a huge amount of data into file system simultaneously. It does not only require a huge storage space to store system state, but also brings a tremendous(More)
With the increase of system scale, the inherent reliability of supercomputers becomes lower and lower. The cost of fault handling and task recovery increases so rapidly that the reliability issue will soon harm the usability of supercomputers. This issue is referred to as the “reliability wall”, which is regarded as a critical problem for current and future(More)
The rapid growth of large scale computing systems imposes a grave challenge to their power management, where power provision and capping is essential. In this paper, we propose a new architecture of power provision and capping to control the power consumption of large scale clusters. In this architecture, performance sensitive computation units are(More)
To improve nonuniformity correction real-time performance of infrared focal plane arrays (IRFPA), a novel compression nonuniformity correction algorithm is proposed. In this paper the basic principle of the proposed algorithm are expounded, and its real-time performance is tested by hardware. Experimental results show that the proposed algorithm has the(More)
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