摘要：
Limited diffracting waves which have great application potential for field focus depth enlargement in acoustic imaging systems. The calculation of limited diffracting waves acoustic fields is most often based on the spatial impulse response approach as suggested by field is found from a convolution between the acceleration of Tupholme and Stepanishen. This paper shows the limited diffracting waves acoustic based on annular planar transducers, it can be found from the crossings between the boundary of the aperture and a spherical wave emitted from the field point onto the plane of the emitting aperture. Summing the angles of the arcs within the aperture readily yields the spatial impulse response for a point in space. The approach not only make it easy to calculate of limited diffracting waves acoustic fields but also improve the accuracy of simulation results of acoustic fields.
关键词：
World Wide Web;Geographical Information Systems;three-tier mode;Component Object Model;three-tier browser-server architecture
摘要：
We designed an Efficient World Wide Web Geographical Information Systems (WebGis). We firstly presented a novel three-tier mode of WebGis. Then, we designed an efficient Gis server. Finally, we designed in detail the function of each module.
关键词：
Congestion Control;Stream Control Transmission Protocol (SCTP);Transmission Control Protocol (TCP);Wireless Local Network (WLAN)
摘要：
The technologies of Wireless local networks and cellular network are very popular and more and more service under the integrated heterogeneous environment. Stream Control Transmission Protocol (SCTP) is considered as an ideal to support the communication between them by enabling a mobile client to freely switch the IP address in different networks. In this paper, we propose an extended analytical model for SCTP which consider the congestion window and scalable of congestion control mechanism. A great advantage of our model is that establishing a relationship between the throughput and congestion control mechanism. Furthermore, the analytical model provides a useful tool to improve congestion control mechanism of SCTP.
作者：
Feng, Hong-Cai;Yuan, Xiao-Juan;Ming, Wei;Yuan, Cao
期刊：
Proceedings of the International Conference on E-Business and E-Government, ICEE 2010,2010年:1647-1650
通讯作者：
Feng, H.-C.(fenghc@whpu.edu.cn)
作者机构：
[Feng, Hong-Cai; Yuan, Cao; Ming, Wei; Yuan, Xiao-Juan] Department of Computer and Information Engineering, Wuhan Polytechnic University, Wuhan, China
摘要：
This paper studies the utility-maximization resource allocation problem for soft QoS traffic in wireless networks, which demands certain amount of bandwidth for normal operation but allows some flexibility. With deviations to the known approaches and solutions, we propose a novel utility optimization model, which bounds the bandwidth allocation of each flow around its desired value and allows certain flexibility. We theoretically analyse this model and give a complete procedure to obtain the solution.
摘要：
In traditional vocal tract length normalization (VTLN) method, the details of the differences of spectral among speakers can not be modeled, because only a simple vocal tract length factor is regarded as the absolutely indicator of the speaker specific attribute, according to the assumption of lossless multi-tube vocal tract model. In this paper, the piece-wise frequency warping function is adopted to describe the speaker specific character in detail. With an appropriate partition of frequency axis, the differences of spectral can be removed well. Due to the model-independent warping function, this method is proved to be a quite fast adaptation technique, and especially suitable for the unsupervised adaptation.
