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Erasure codes are widely used in practical storage systems to prevent disk failure and data loss. However, these codes require excessive disk I/Os and network traffic for recovering unavailable data. As a result, the recovery performance of erasure codes is suboptimal. Among all erasure codes, Minimum Storage Regenerating (MSR) codes can achieve optimal repair bandwidth under the minimum storage during...
Die-stacked DRAM (a.k.a., on-chip DRAM) provides much higher bandwidth and lower latency than off-chip DRAM. It is a promising technology to break the "memory wall". Die-stacked DRAM can be used either as a cache (i.e., DRAM cache) or as a part of memory (PoM). A DRAM cache design would suffer from more page faults than a PoM design as the DRAM cache cannot contribute towards capacity of...
As there is a rapid development of the wearable camera embed glasses in this decade and these wearable camera embed glasses are portable for the consumer uses, many image recognition systems are developed based on these wearable camera embed glasses. To perform the image recognition, a deep learning based convolution neural network is employed. Instead of using the conventional back propagation approach...
Erasure codes are widely used in distributed storage systems to prevent data loss. Traditional erasure codes suffer from a typical repair-bandwidth problem in which the amount of data required to reconstruct the lost data, referred to as the repair bandwidth, is often far more than the theoretical minimum. While many novel erasure codes have been proposed in recent years to reduce the repair bandwidth,...
Erasure codes are widely used in modern distributed storage systems to prevent data loss and server failures. Regenerating codes are a class of erasure codes that trades storage efficiency and computation for repair bandwidth reduction. However, their non-unified coding parameters and huge computation overhead prohibit their applications. Hence, we first propose a family of Functional Regenerating...
A front-end preamplifier consisted of transimpe-dace amplifier (TIA) core, single-to-differential converter (STDC) and output buffer(OB) is proposed in this paper. The goal is to realize a low cost and high performance preamplifier to be used in the optical receiver modules based on the standard 0.5um complementary metal oxide semiconductor (CMOS) process. The regulated cascade (RGC) input structure...
Large scale scientific applications are often bottlenecked due to the writing of checkpoint-restart data. Much work has been focused on improving their write performance. With the mounting needs of scientific discovery from these datasets, it is also important to provide good read performance for many common access patterns, which requires effective data organization. To address this issue, we introduce...
Significant challenges exist for achieving peak or even consistent levels of performance when using IO systems at scale. They stem from sharing IO system resources across the processes of single largescale applications and/or multiple simultaneous programs causing internal and external interference, which in turn, causes substantial reductions in IO performance. This paper presents interference effects...
According to deep analysis on the usability of COPS protocol in the solution to network QoS, the paper puts forward an argument which is based upon call control server in Softswitch system, then give a simulation by using the scheme. Via analyzing the simulation results, it proves that the scheme could improve network transmission quality effectively, and make a better use of network bandwidth.
Based on circular conjugate symmetry properties (CCSP) of discrete Fourier transform (DFT), a novel approach to nonorthogonal frequency division multiplexing (NOFDM) is presented. Different from other NOFDM systems, a simple estimation algorithm is exploited in the receiver instead of maximum likelihood sequence detection (MLSD) while the bit error rate (BER) of the proposed system is similar to those...
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