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Dragonfly network is widely used in modern high-performance computing systems. On this network, however, interference caused by network sharing can lead to significant network congestion and degraded performance. In this work, we present a comparative analysis of intra-application interference on applications with nearest neighbor communication, considering various placement strategies. Our results...
As Internet applications have become more diverse in recent years, users having heavy demand for online video services are more willing to pay higher prices for better services than light users that mainly use e-mails and instant messages. This encourages the Internet Service Providers (ISPs) to explore service differentiations so as to optimize their profits and allocation of network resources. Much...
Nowadays, virtual private network has become more and more significant for internet users. As one of the key techniques among VPN architecture, the implementation of data encryption algorithm is playing an important role. In this paper, we implements a Chinese encryption algorithm SM4 towards network flows based on Tilera-Gx multiprocessor, considering some of the features of the processor: SIMD and...
Cognitive radio (CR) techniques promise to significantly increase the available spectrum thus wireless bandwidth. With the increase of spectrum allowed for CR, it is critical and challenging to perform efficient wideband sensing. We propose an integrated sequential wideband sensing framework which concurrently exploits sequential detection and compressed sensing (CS) techniques for more accurate and...
Semi-supervised learning algorithms make use of labeled and unlabeled samples. A large number of experiments show that the use of unlabeled samples may improve approximation power. However, there is seldom quantitative analysis of approximation power when the number of samples increases. In this paper a semi-supervised learning algorithm is constructed based on diffusion matrices. We establish the...
This paper develops a unified approach to obtain optimal transmission schedule for an energy-harvesting node with non-ideal circuit power consumption. For both time-invariant and time-varying fading channels, we show that the optimal transmission between any two consecutive channel or energy state changing time, termed epoch, can only take one of the three strategies: (i) no transmission, (ii) transmission...
Distributed storage systems provide large-scale reliable data storage services by spreading redundancy across a large group of storage nodes. In such big systems, node failures take place on a regular basis. When a node fails or leaves the system, to maintain the same level of redundancy, it is expected to regenerate the redundant data at a replacement node as soon as possible. Previous studies aim...
User profiling plays an important role in online news recommendation systems. In this paper, we analyze the relationship between users' clicking behaviors and the category of the news story to model user's interests by mining web log data of an adaptive news system. We train a Memory-based User Profile (MUP), which imitates human being's learning, remembering and forgetting mechanisms, to predict...
Microgrid can effectively integrates micro-sources, loads and energy storage devices; can make economic and environmental benefits by using new energy power generation; can better meet the requirements of customers for higher power quality and reliability of power supply. The optimal operation of the microgrid is a complex optimization problem, which contains multi-goal and multiple constraint situations...
A type of near-field antenna for RFID reader is proposed, which has folded-dipole antenna structure. A parasitic capacitance patch is inserted on the gap between two arms of folded-dipole antenna to adjust the antenna impedance. It's shown by simulation that near-field antenna is efficient to reduce antenna dimension for UHF RFID reader.
Mobile robots often need to find a trajectory to another position in their environment, subject to constraints posed by obstacles and the robot's capabilities. Several approaches have been used to address this problem each with some limitations, including state discretizations, planning efficiency, and lack of interleaved execution. Anytime RRTs algorithm is a recently developed algorithm on which...
This paper proposes an approach for automated composition of Web services using the And/Or graph and designs a corresponding layered architecture. The composition approach which decomposes tasks into smaller And, Or subtasks in And/Or graph bases on the similarity algorithm to find out optimized solution graph. Additionally, we embed the sequence-and node to support the transition from the And/Or...
Peer-to-peer applications require high cooperation among users. User cooperation consists of two aspects, upload and download operations. However, not all users are willing to cooperate, and free-riders with little upload bandwidth are widely seen in the applications. Hereby, we put forward the relation between data block probability and the node distance in static situations. Then we discuss the...
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