Networks-on-Chip (NoC) has been proposed as an only efficient and scalable solution for providing global on-chip communications in any large VLSI design. Simultaneously, power dissipation issues have grown to such importance that they now constrain attainable performance. The large value of power consumption, relative to the active power, can therefore have serious implications for the feasibility of deploying NoCs. If NoCs are to be accepted, their full power implications need to be known. Moreover, these power characteristics must be accurately understood across the large possible design space of NoCs. Blocking time is one of the effective factors on NoC power consumption. In this paper we present a Markovian model for evaluating the amount of the dissipated power comes from packet blocking and show the blocking time effects on total power consumption of on-chip networks approach.
It is necessary to suppress the average delay to low when a packet is forwarded from a source node to a destination node in Network-on-Chip (NoC) for the quality maintenance of the communication between nodes. Routing algorithms have a prominent impact on communication quality and performance in on chip interconnection networks. In this paper, we present a novel routing method called Predominant Routing which can select the best route for communication flows using a simple setup network.
In the setup network time, a number of low-latency virtual point-to-point connections are provided to construct the best route at run time when a new flow (a connection between a source and its destination to carry messages) is detected.Evaluation results show that the proposed routing algorithm consumes low power and approach to extremely low latency in packet switched Networks-on-Chip.
In this paper the specimens of Aluminum 2024 with 5 millimeter in thickness are joined together by friction stir welding with travel speed of 100 mm/min and tool rotational speeds of 450, 900 and 1800 rpm and a tool were made of hot working steel, H13, firstly. Thus three kinds of welds are produced. Radiography and ultrasonic (UT) non-destructive testing (NDT) procedure were applied to characterize the presence and geometry of possible weld defects prior to mechanical destructive testing. A Echograph Model 1090 digital UT instrumentation and a 4 MHz angle beam probe (refraction angle α = 70°) was used for C-scan of UT contact testing of welded samples (transverse UT velocity 2850 m/s and signal amplification 40 dB). The detection accuracy of defects can be improved by image fusion of ultrasonic and radiography data. For this reason, the data of the two sensors are transformed into a same scale images (length, width and also depth). Pixel by pixel image fusion is used for fusion and analysis. Comparing these results with the destructed part shows that the fusion of two tests improves the results.
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