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41.
《Microelectronics Journal》2014,45(11):1480-1488
—In this paper, we present a coordinate rotation digital computer (CORDIC) based fast algorithm for power-of-two point DCT, and develop its corresponding efficient VLSI implementation. The proposed algorithm has some distinguish advantages, such as regular Cooley-Tukey FFT-like data flow, identical post-scaling factor, and arithmetic-sequence rotation angles. By using the trigonometric formula, the number of the CORDIC types is reduced dramatically. This leads to an efficient method for overcoming the problem that lack synchronization among the various rotation angles CORDICs. By fully reusing the uniform processing cell (PE), for 8-point DCT, only four carry save adders (CSAs)-based PEs with two different types are required. Compared with other known architectures, the proposed 8-point DCT architecture has higher modularity, lower hardware complexity, higher throughput and better synchronization.  相似文献   
42.
In this paper, we propose a novel shape and physical attribute handling system Volume-CAD designated for practical and robust use in the manufacturing process of various industries. The internal data structure ‘Kitta Cube’ is formalized by CW-complexes. Complex is a structure consisting of different dimensional items with consistency (without gap or overlaps), therefore allowing each volume comprising of a material separated by boundaries to be represented completely. Volume-CAD (VCAD1) could be called ‘solid and fluid model’, as it goes beyond the solid model. As applications of VCAD, this paper discusses surface simplification of Kitta Cubes, cell labeling (three-dimensional coloring), and multiple-materials situation. These models can be used not only for manufacturing but also throughout the product life cycle from shipment tracking until the end of the product life cycle.  相似文献   
43.
In this work both detection of the beginning of dry-band arcing and correlating the average value of leakage current (LC) with non-ceramic insulator surface damage have been investigated. Silicone rubber insulators were tested in salt-fog under different voltage and conductivity levels. The autocorrelation function (ACF) was calculated for both the fundamental and third harmonic components of LC during the early aging period (EAP). It has been observed that distinct differences exist in the behavior of both the fundamental and that of the third harmonic components of the LC during EAP. Although the fundamental component of the LC begins to grow immediately after starting the test, the third harmonic requires a much longer period of time to begin. Dry-band arcing is highly correlated with distortion in the LC and hence to its third harmonic component. But it has been observed that the level of the fundamental component of LC at which the third harmonic component started to increase is different from one case to another. As such, it is more appropriate to use the ACF of the third harmonic component of LC as an indication of dry-band arcing rather than a simple threshold value. Moreover, the average value of LC during late aging period (LAP) was correlated with the damage of non-ceramic insulators. It has been found that the average level of both the fundamental and third harmonic component of LC is well correlated with the different degrees of damage of non-ceramic insulators’ surface.  相似文献   
44.
In this paper, we study the problem of multi-terminal nets layout optimization. To solve the problem, we propose a polynomial-time algorithm, which first constructs minimum spanning tree and then generates spanning tree set. An algorithm for near-minimum spanning trees set with controllable length deviation from a minimum is proposed. Effective trees length deviation value and trees number are investigated.  相似文献   
45.
以CRH2动车组的动力转向架的轴箱轴承(密封双列圆锥滚子轴承)为研究对象,利用温度场和热应力场的耦合关系,对该轴承建立了温度场和热应力分布的数值模型,再通过Matlab软件对建立的模型进行仿真分析和验证。结果表明:所采用的分析方法是合理、可行的,为后续的高速机车转向架传动装置中轴承的设计时的动态分析提供了一定的指导作用。  相似文献   
46.
47.
带休眠算法的无线传感器网络MAC协议   总被引:1,自引:0,他引:1  
由于无线传感器网络中每个传感器节点的能量有限,所以需要有效的MAC协议来保持能量的高效利用。在MAC协议中引入休眠算法是其中一种重要的节能方式。现有的带休眠算法的无线传感器网络MAC协议已有很多种,主要分为2大类:一类是以S-MAC协议为代表的基于休眠/监听排程方案来达到节能目的的MAC协议;另一类是以WiseMAC为代表的基于低功率信道检测方案的MAC协议。对现有的主要几种有代表性的带休眠算法的无线传感器网络MAC协议进行了描述,分析了它们各自的优缺点,并进行了对比和总结。  相似文献   
48.
Engineers need a breadth of experience to enrich the gene pool of ideas from which elegant engineering solutions can be drawn, called “individual diversity.” While performing large ethnographic research studies where hundreds of engineering students were interviewed, we interviewed Inez, a student that epitomizes individual diversity. Inez is unlike most engineers: she is female, multi‐minority, and from a socio‐economically disadvantaged background. Inez's story is told here using “ethnography of the particular,” where the story of a single individual is explored. Inez has persevered through challenges posed by her lack of familiarity with the culture of engineering, her weak high school preparation, and her feelings of being an outsider in engineering. Inez's story demonstrates that the playing field in engineering is still not level, particularly for socio‐economically disadvantaged students. Her story provides a poignant example of the impact of five of Conefrey's cultural myths of science.  相似文献   
49.
Author index     
《Calphad》2001,25(4):693-696
  相似文献   
50.
《Data Processing》1986,28(5):267
As networks become larger and more complex, the question of security and the prevention of network access by unauthorized users are real concerns. Software is now available which allows the PC user to set up a network offering similar advantages to those already enjoyed by minicomputer and mainframe users.  相似文献   
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