The application of the fdtd method to imitation and analysis of the mems microstrip antenna effectually saves memories and the computing time . it consequently achieves preferable purpose . as a result, it shows the validity and superiority of the algorithm in analyzing complicate microstrip patch antennas 本论文将fdtd法应用于mems微带天线的仿真分析,有效地节约了存储空间和计算时间,取得了较好的效果,显示了fdtd法用于分析复杂结构微带贴片天线的有效性和优越性
This thesis mainly focuses on the multi-level parallelism development and performance optimization of scientific programs on this architecture, and our works are summarized as follows . ( 1 ) we put forward the multi-level parallel computing time model, which is suitable for smp cluster to analyze program performance from the micro-aspect . we also provide a multi-level parallel optimization speedup model based on the single-processor speedup factor, which can evaluate program performance from three parallel levels and guide us to improve the programs 本文围绕这种多级并行体系结构中的超节点级、节点级和单机指令级三个层次的并行性开发与优化,在科学计算程序的综合优化技术研究方面做了以下的工作与创新:(1)针对smp集群体系结构提出了多级并行计算时间模型,用于程序性能的微观分析;将单机处理速度与加速比统一起来,提出了基于单机优化加速因子的多级并行优化加速比评价模型,该模型分别从三个并行层次的角度出发对程序性能进行评价,并指导对程序的改进与优化。
These developed mlpnn models can give the same reliable results as that of the electromagnetic simulations, but their computing time are negligible . since this approach can efficiently remedy the time-consuming problem of single numerical method, it is very potential in the accurate and efficient interconnect modeling of circuit eda / cad 所得模型具有与电磁仿真同样的精度,而计算时间可忽略不计,成功地解决了纯数值方法的巨大耗时问题,非常适合用于电路设计所需的准确高效的edacad互连模型的建立。
According to one of voxel coloring algorithm's shortcomings this thesis brings forward an improvement method, with reference to the theory of shape from silhouette . this improvement method looks on every input image as a validate of the reconstruct results, improving the result accuracy and saving the computing time 针对原有算法的理论缺陷,借鉴shapefromsilhouette算法的思想,提出了一种将每一幅输入图像作为一种“验证”的改进方法,极大的提高了体素上色算法的计算精度和运算速度。
To analyze the factors of impacting load balancing of links, which is including the number of routes between source node and destination node, the number of routes through every link, the maximum flow between source node and destination node, the maximum flow through every link, the free bandwidth of every link and so on, we present the fast dynamic routing algorithm ( fdra ) and the critical link routing algorithm ( clra ) . simulation results show presented algorithms in the paper are better than other algorithms in reject ratio of the traffic requests and performance of rerouting the traffic requests when a link is failure, especially in computing time cost 通过分析影响网络的链路负载均衡的因素,比如源-目的节点间的最大流,通过每条链路的最大流,源-目的节点间的路径数目,通过每条链路的路径数目,以及链路的剩余容量等,提出了快捷动态路由算法fdra和关键性链路路由算法clra,通过仿真,与最小跳算法(mha)、最宽最短路径(wsp)算法、最小干扰路由算法(mira)相比较,提出的两种算法在业务阻塞率、资源利用率以及重路由性能方面都有很好的效果。
The hardware implementation results against real image input are presented and analyzed . compressed images compressed by fpga are compared to compressed images compressed by software, focusing on computing time and compress quality . future research areas are suggested to improve the jpeg encoder performance 在本文的测试部分,阐述利用实际图像作为输入,从fpga的输出得到了正确的压缩图像,计算了相应的图像压缩速度和图象质量指标,并与软件压缩的速度和结果做了对比,提出了未来的改进建议。
With a view to dct that costs the longer computing time, fast dct is proposed, and the method of prejudgment of an macro-block of all zero coefficient of dct is adopted in this paper, which makes about 40 percent dct computation reduced, consequently, the encoding speed of h . 263 encoder can be further increased 263编码器的编码速率;对运算量较大的dct给出了快速算法,并对全零dct系数块采用提前判断的方法,从而省去了约40的dct运算,进一步提高了h263编码器的编码速率。
Meanwhile, owing to the fact that there is huge hardness in accurate extracting of attenuation constant, one of the most new modified compact fdtd methods is applied to analyzing lossy multiple conductors to give accurate results . it is combined with the nonuniform mesh partitioning technique to reduce the computing time 针对有耗导体衰减常数难以精确提取的问题,将一种最新改进降维方法应用到有耗多导体系统分析中,并结合非均匀网格划分技术,在得到准确衰减常数的同时有效地减少计算时间。
In order to reduce the computing time and improve efficiency, the procedure has been paralleled and the distributed parallel computation is accomplished in a net with four pcs . the parallel computation of static aeroelasticity and flutter has been initiated at home . on this basis, the work includes four parts 通过对单机串行程序进行分布式并行化改造,在国内首次实现了基于微机网络上的静气动弹性和颤振分布式并行计算,解决了数值求解气动弹性问题难以避免的耗时巨大的问题。
Firstly, as a forward problem is solved for each iteration of ga reconstruction, calculating the electric field for a given distribution permitivity and driving source-this aspect will be treated with more detail . the thesis uses finite element method ( fem ) to solve it, because fem can conveniently handle inhomogeneous dielectric, converge well, and spare computing time by compacting the matrix 本文首先建立了介电成像的数学模型,采用有限元方法求解正问题,有限元方法的优点在于能方便地处理非均匀介质、具有良好的收敛性、可以压缩系数矩阵而节省计算时间,这有利于应用遗传算法进行优化。