Many applications demand distributing data with different contents efficiently in the network environment with unreliable links and a high node churn. Existing approaches mostly focus on optimizing either efficiency o...
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Many applications demand distributing data with different contents efficiently in the network environment with unreliable links and a high node churn. Existing approaches mostly focus on optimizing either efficiency or robustness of data distribution, and fail to ensure both of them simultaneously. In this paper, we propose Semantic Cast - a content-based data distribution approach over self-organizing semantic overlay networks. Semantic Cast maintains a self-organizing semantic overlay based on view exchange (called Crowd). In Crowd, each node seeks neighbors with more similar interests by periodically exchanging its neighbor list (called view) with a chosen neighbor. Through these nodes' self-organizing behavior, various interest communities emerge in the overlay. For data distribution over Crowd, Semantic Cast adopts random walk to route data between interest communities, and adopts flooding to disseminate data inside the interested communities. The experimental results show that compared to existing approaches, Semantic Cast can support efficient content-based data distribution in the unreliable and highly dynamic network environment.
The influence of on-chip metal interconnections, power grids, heat sink together with packaging, and metal dummy fills on the transmission characteristics of a 2mm-long integrated dipole antenna pair has been investig...
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The influence of on-chip metal interconnections, power grids, heat sink together with packaging, and metal dummy fills on the transmission characteristics of a 2mm-long integrated dipole antenna pair has been investigated in this paper. These metal structures and placements have been classified and particular simulations are performed to explore the interference effects of neighboring various metal structures on transmission gain, phase, impedance and radiation pattern for on-chip dipole antenna pair. By virtue of the experimental results and analyses, several experiential linear expressions for antenna pair gain and phase in interference circumstances are obtained using numerical fit. A set of design rules is concluded accordingly for guiding on-chip antenna layout and design targeting wireless interconnect.
Combining virtual machine technology, virtual computing is able to effectively aggregate the widely distributed resources to provide users services. We view the federation of multiple data centers and voluntary resour...
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Combining virtual machine technology, virtual computing is able to effectively aggregate the widely distributed resources to provide users services. We view the federation of multiple data centers and voluntary resources on the Internet as a very large scale resource pool. Based on the tree structure of the pool, this paper proposes a virtual machine deployment algorithm, called iVDA, considers users' requests and the capabilities of the physical resources as well as the dynamic load, implements an adaptive mechanism to scheduling servers to host virtual machines forming virtual execution environments for various applications, and supports on-demand computing.
Single-electronic transistors (SETs) are considered as the attractive candidates for post-CMOS VLSI due to their ultra-small size and low power consumption. Because SETs with single island can not work at room tempera...
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ISBN:
(纸本)9781424435432
Single-electronic transistors (SETs) are considered as the attractive candidates for post-CMOS VLSI due to their ultra-small size and low power consumption. Because SETs with single island can not work at room temperature normally, more and more researchers begin to make research on the SETs with 1-dimension multi-islands. A new simulation method-nSET, is introduced in this paper. Compared with other methods, nSET can simulate the SET device with 1-dimension multiple islands with high speed and accuracy. Through the comparison, it can be get that nSET is accurate and fast compared with the classical Monte Carlo (MC) simulator, and is very useful for the ASIC design of SET devices.
According to Moore's law the complexity of VLSI circuits has doubled approximately every two years, resulting in simulation becoming the major bottleneck in the circuit design process. parallel and distributed sim...
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According to Moore's law the complexity of VLSI circuits has doubled approximately every two years, resulting in simulation becoming the major bottleneck in the circuit design process. parallel and distributed simulations can be applied as fast, cost effective approaches to the simulation of large, complex circuits. In this paper, a simple yet effective simulated annealing-based approach is proposed to optimize the choice of a time window for optimistic parallel simulation. We chose gate level circuits simulations as our experimental vehicle. Our results show up to a 52% improvement in the simulation time using our simulated annealing algorithm. To the best of our knowledge, this is the first time that SA has been applied to optimize the performance of time warp simulations.
Insects build architecturally complex nests and search for remote food by collaboration work despite their limited sensors, minimal individual intelligence and the lack of a central control system. Insets' co...
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ISBN:
(纸本)9781424472796
Insects build architecturally complex nests and search for remote food by collaboration work despite their limited sensors, minimal individual intelligence and the lack of a central control system. Insets' collaborations emerge as a response of the individual insects to Stigmergy. A sign-based model of Stigmergy to discuss collaboration is proposed in this paper where we picked up "sign" as a key notion to understand it. Therefore, sign is the link of all the components in a Stigmergic complex adaptive system. Based on this understanding, we propose a definition that reveals the nature of signs and exploit the significations and relationships carried by the notion of sign. Then, a sign-based model of Stigmergy is consequently reached, which captures the essentials of Stigmergy. A basic architecture of Stigmergy as well as its constituents are presented and discussed. At last, some applications of the model are discussed.
Encryption technology has become an important mechanism of securing data stored in the outsourced database. However, it is a difficulty to query efficiently the encrypted data and many researchers take it into conside...
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ISBN:
(纸本)9781424477050
Encryption technology has become an important mechanism of securing data stored in the outsourced database. However, it is a difficulty to query efficiently the encrypted data and many researchers take it into consideration. To solve the problem, an encrypted schema, based on the Postgresql DBMS, is proposed. Through the security dictionary and the extended SQL, the approach implements the encrypted storage and efficiently query over the encrypted data in the outsourced databases. Results of experiments validate the efficiency and feasibility of our approach.
The effect of quantum capacitance (QC) on the switching speed in T-CNFETs (Tunneling Carbon Nanotube Field Effect Transistors) is investigated with simulation using NEGF (Non-Equilibrium Green's Function) formalis...
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ISBN:
(纸本)9781424435432;9781424435449
The effect of quantum capacitance (QC) on the switching speed in T-CNFETs (Tunneling Carbon Nanotube Field Effect Transistors) is investigated with simulation using NEGF (Non-Equilibrium Green's Function) formalism. Firstly, based on the analytical expression of SS, a quantitative study of the source/drain leads doping level is made to obtain an averaged inverse subthreshold slope(SS) as small as possible. And then the impact of QC on the gate control, thus on SS, is studied. Lastly, for the first time, approaches for restricting the impacts of QC are investigated, such as tuning the drain-source bias condition or CNT diameter which are governed by the analytical expression presented at the end of this paper. The modeling results reveal that the QC in T-CNFET has a negative impact on both the SS and on-current, and such impact could be restricted effectively with a proper choice of drain-source voltage and CNT chirality.
Multi-island single electron transistor (MISET) is a kind of single electron transistor (SET), which has advantages of the room temperature operating. A novel semi-empirical compact model for MISET is proposed. The ne...
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Multi-island single electron transistor (MISET) is a kind of single electron transistor (SET), which has advantages of the room temperature operating. A novel semi-empirical compact model for MISET is proposed. The new approach combines the orthodox theory of single electron tunneling for single Coulomb island and a novel empirical analysis for a chain of Coulomb islands. The model is verified by the Monte-Carlo method in SIMON simulator, and is much faster than the traditional multi-island SET simulator, which has the advantages for the large scale multi-island SET circuit simulation.
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