Mobile Ad Hoc Network (MANET) is a self-organized, quickly configurable network, which does not have fixed infrastructure. Mobility is one of the most characteristic in MANET, but it may cause the failure of a valid l...
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Topological structure is an important part of the design of network on chip systems. The majority of current NoC architectures employ mesh topology, but at some practical application, NoC systems often integrate a num...
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UHF-band radar, which is widely used in early warning, has the unique advantage on target detection. However it can be seriously interfered by the GSM base station with the same frequency channel in practical applicat...
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Increasing demand for high performance has impelled the development of process technology and IC design technology. Due to production technology restrictions, traditional single-core processors have encountered bottle...
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ISBN:
(纸本)9781467349345
Increasing demand for high performance has impelled the development of process technology and IC design technology. Due to production technology restrictions, traditional single-core processors have encountered bottlenecks both in frequency and performance. Heterogeneous multi-core SoC, such as CPU + coprocessor + peripherals, is accepted as a cost-effective solution for the increasing computation demands in embedded system. The system performance depends on the processor frequency, the memory access rate, and the I/O access rate, but their development is unbalanced, and CPU has to wait for the response from the memory or I/O for a long time in order to continue pro- cessing. Hardware multithreading technology has been used to effectively hide memory latency and significantly increase total system performance with low cost. This paper presents a design of coprocessor IP based on altera PicaRISC multithreaded pro- cessor which can execute eight threads simultaneously using a time-slicing multithreading approach. The IP core was designed based on avalon bus, and can be easily integrated into nearly any system. The test result shows that fft3780 calculation can speed up to 9 times using 16 threads.
A double-layer grating structure is proposed, which can show nonreciprocal transmission in near-IR frequency range. The structure is composed of metallic grating with magneto-optical substrate. The nonreciprocity depe...
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Topological structure is an important part of the design of network on chip systems. The majority of current NoC architectures employ mesh topology, but at some practical application, NoC systems often integrate a num...
详细信息
ISBN:
(纸本)9781467349345
Topological structure is an important part of the design of network on chip systems. The majority of current NoC architectures employ mesh topology, but at some practical application, NoC systems often integrate a number of heterogeneous blocks, or some fabrication faults, reliability issues, may lead to the need of irregular topologies. Consequently, simplistic routing techniques such as XY scheme can not be employed in irregular topologies. This paper presents an efficient specific routing scheme for the irregular mesh network which can be guaranteed for the connection in irregular topologies. This paper applies routing tables (RT) to realize the algorithm and use OVP (Open Virtual Platforms)+ TLM (Transaction Level Modeling)+systemC to create a virtual platform, achieving a 16 xl6 irregular mesh topology of heterogeneous systems. Finally the routing scheme is applied to test specific real application network instances, and the result shows its connectivity and efficiency.
Multi-hop time synchronization in wireless sensor networks (WSNs) is often time-consuming and error-prone due to random time-stamp delays for MAC layer access and unstable clocks of intermediate nodes. Constructive in...
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In Opportunistic Mobile Networks (OppNets), data is opportunistically exchanged between nodes who encounter each other. In order to enable such data exchanges, nodes in the network have to probe their environment cont...
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In Opportunistic Mobile Networks (OppNets), data is opportunistically exchanged between nodes who encounter each other. In order to enable such data exchanges, nodes in the network have to probe their environment continually, so as to discover neighbor nodes. This can be an extremely energy-consuming process. If nodes probe very frequently, they will consume a lot of energy, and might be energy inefficient. On the other hand, infrequent contact probing might cause nodes to miss many of their contacts, and thus opportunities to exchange data are lost. Therefore, there exists a trade-off between energy efficiency and the contact opportunities in OppNets. In this paper, in order to investigate this trade-off, we first propose a model to quantify the detecting probability in OppNets, using the Random WayPoint (RWP) model. Then, extensive simulations are conducted to validate the correctness of our proposed model. Finally, based on the proposed model, we analyze the tradeoff between energy efficiency and the total number of effective contacts under different situations. Our results show that the good trade-off points are obviously different when the speed of nodes is different. Moreover, the detecting probability increases as the speed of nodes decreases, while the total number of effective contacts increases as the speed of nodes increases.
Recently biosensors based on silicon nanowire field-effect transistors (SiNW-FETs) have drawn huge amounts of attention, due to their ultrasensitivity, selectivity, lab.l-free and real-time detection abilities. As peo...
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The electrical characteristic test of nanowires is important in nano-materials research. The metal-semiconductor junction that is fabricated with semiconductor nanowire and metal probe in electrical test system has im...
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