In this work, we present our implementation of the density functional theory (DFT) plane wave pseudopotential (PWP) calculations on GPU clusters. This GPU version is developed based on a CPU DFT-PWP code: PEtot, which...
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In this work, we present our implementation of the density functional theory (DFT) plane wave pseudopotential (PWP) calculations on GPU clusters. This GPU version is developed based on a CPU DFT-PWP code: PEtot, which can calculate up to a thousand atoms on thousands of processors. Our test indicates that the GPU version can have a ~10 times speed-up over the CPU version. A detail analysis of the speed-up and the scaling on the number of CPU/GPU computing units (up to 256) are presented. The success of our speed-up relies on the adoption a hybrid reciprocal-space and band-index parallelization scheme. As far as we know, this is the first GPU DFT-PWP code scalable to large number of CPU/GPU computing units. We also outlined the future work, and what is needed to further increase the computational speed by another factor of 10.
Delay tolerant networks(DTNs) can interconnect highly heterogeneous networks among extreme environments even between nodes without end-to-end path. As a new evolution of Mobile Ad hoc network(MANET)and wireless sensor...
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Delay tolerant networks(DTNs) can interconnect highly heterogeneous networks among extreme environments even between nodes without end-to-end path. As a new evolution of Mobile Ad hoc network(MANET)and wireless sensor network(WSN), the DTN is an important technique in ubiquitous networking when the time-space range of data collection and service is greatly expanded. As the key components of DTN, routing technique is a challenge and promising research field. While a lot of DTN routing protocols have been proposed, there is no comprehensive classification system for DTN routing protocols. Review for various protocols in respect of principles, characteristics, comparisons is also needed. This paper introduces the architecture, challenges, theoretical basis, evaluation metrics and classification of DTN routing protocols. The basic principles and features of representative routing algorithms are analyzed and compared for each class, intending to motivate new research and development in this area.
The properties and known constructions of orthomorphic permutations were investigated. On this basis, a new recursive method to construct an n-variable orthomorphic permutations from two (n-2)-variable ones is present...
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The properties and known constructions of orthomorphic permutations were investigated. On this basis, a new recursive method to construct an n-variable orthomorphic permutations from two (n-2)-variable ones is presented. Furthermore, the new constructed orthomorphic permutations are different from the known ones. In addition, the constructed orthomorphic permutations are pair-wise different. Finally, combining the known orthomorphic permutations and a special class of orthomorphic permutations, the number of the new constructed orthomorphic permuta-tions is proposed.
Two simple quantum broadcast communication schemes are proposed. A central party can broadcast his secret message to all the legitimate receivers simultaneously. Compared with the three schemes proposed recently （Wan...
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Two simple quantum broadcast communication schemes are proposed. A central party can broadcast his secret message to all the legitimate receivers simultaneously. Compared with the three schemes proposed recently （Wang et al. 2007 Chin. Phys. 16 1868）, the proposed schemes have the advantages of consuming fewer quantum and classical resources, lessening the difficulty and intensity of necessary operations, and having higher efficiency.
To safeguard the interests of transacting parties,non-repudiation mechanisms need to assure fairness and *** non-repudiation service currently implemented usually does not consider the requirement of fairness and the ...
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To safeguard the interests of transacting parties,non-repudiation mechanisms need to assure fairness and *** non-repudiation service currently implemented usually does not consider the requirement of fairness and the fair non-repudiation protocols to date can not be suitably applied in real environment due to its complex *** paper discusses the transaction-oriented non-repudiation requirement for Web services transaction,analyzes the constraints of the traditional model for the available fair non-repudiation protocols and designs a new Online-TTP fair non-repudiation *** new protocol provides a fair non-repudiation solution to secure Web services transactions and can be embedded into a single Web service *** protocol adopts evidence chained to decreasing the overhead of evidence verification and management and alleviates the overhead of certificate revocation checking and time-stamp generation for *** protocol has strong fairness,timeliness,efficiency and practicability.
Unconditionally secure signature is an important part of quantum cryptography. Usually, a signature scheme only provides an environment for a single signer. Nevertheless, in real applications, many signers may collabo...
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Unconditionally secure signature is an important part of quantum cryptography. Usually, a signature scheme only provides an environment for a single signer. Nevertheless, in real applications, many signers may collaboratively send a message to the verifier and convince the verifier that the message is actually transmitted by them. In this paper, we give a scalable arbitrated signature protocol of classical proved to be secure even with a compromised arbitrator. messages with multi-signers. Its security is analyzed and proved to be secure even with a compromised arbitrator.
A novel video steganography scheme based on motion vectors and linear block codes has been proposed in this paper. Our method embed secret messages in the motion vectors of cover media during the process of H.264 comp...
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In this paper, a model for the static channel assignment in multi-radio multi-channel wireless mesh networks is proposed. We describe an interference model in wireless communication environment. The degree of detail i...
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An energy-balanced multicast routing algorithm EBMR in wireless sensor networks (WSNs) is proposed. The objective of EMBR algorithm is to improve the energy efficiency and extend the network lifetime in multicast. To ...
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In 2D animation processes, many simulated the movement and the deformation of a moving deformable object simultaneously. The binding of the movement and the deformation increased the complexity and restricted user'...
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