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Search Results: 1 - 10 of 645 matches for " Bandwidth "
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Temperature Dependence of the Raman Intensity and the Bandwidth Close to the Order-Disorder Phase Transition in NaNO3  [PDF]
Hamit Yurtseven, Sukran Aslan
Optics and Photonics Journal (OPJ) , 2012, DOI: 10.4236/opj.2012.223038
Abstract: We analyze the temperature dependence of the Raman intensity using the experimental data according to a power-law formula close to the order-disorder transition (Tc = 549 K) in NaNO 3. From this analysis, we extract the value of β = 0.26 as the critical exponent for the order parameter, which indicates a tricritical phase transition in this crystalline system. Using the temperature dependence of the order parameter, the Raman bandwidth is calculated at various temperatures in NaNO3. Our calculated bandwidths describe adequately the observed behaviour of the order-disorder transition in this crystal.
Strong Consistency of Kernel Regression Estimate  [PDF]
Wenquan Cui, Meng Wei
Open Journal of Statistics (OJS) , 2013, DOI: 10.4236/ojs.2013.33020

In this paper, regression function estimation from independent and identically distributed data is considered. We establish strong pointwise consistency of the famous Nadaraya-Watson estimator under weaker conditions which permit to apply kernels with unbounded support and even not integrable ones and provide a general approach for constructing strongly consistent kernel estimates of regression functions.

Compensation of Finite Bandwidth Effect by Using an Optimal Filter in Photoacoustic Imaging  [PDF]
Chen Zhang, Yan Zhang, Yuanyuan Wang
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B006

Most existing reconstruction algorithms for photoacoustic imaging (PAI) assume that transducers used to receive ultrasound signals have infinite bandwidth. When transducers with finite bandwidth are used, this assumption may result in reduction of the imaging contrast and distortions of reconstructed images. In this paper, we propose a novel method to compensate the finite bandwidth effect in PAI by using an optimal filter in the Fourier domain. Simulation results demonstrate that the use of this method can improve the contrast of the reconstructed images with finite-bandwidth ultrasound transducers.

A Study of Bandwidth Measurement Technique in Wireless Mesh Networks
Ajeet Kumar Singh,Jatindra Kr Deka
International Journal of Ad Hoc, Sensor & Ubiquitous Computing , 2011,
Abstract: Wireless mesh networks (WMNs) have been proposed as a key technology for next generation wirelessnetworking to provide last-mile broadband access. Here we have given our observation and study for endto-end bandwidth estimation in WMNs. End-to-end Bandwidth Estimation is an important metric fornetwork management and monitoring. It can also improve the effectiveness of congestion controlmechanism, audio/video stream adoration and dynamic overlay. In recent years, many techniques havebeen developed for bandwidth estimation in the wired as well as the last-hop wireless networks, but theyunder-perform in WMNs. We investigate attributes that can affect the bandwidth estimation in WNMs; wefound existing techniques do not consider the effect of attributes like CSMA/CA-based contending trafficand high interference interference that leads to the error full estimation.In this paper, we present an active bandwidth measurement technique called Bandwidth Probe based on thepacket dispersion principle. It measures the steady state bandwidth of the system while considering theeffects of the FIFO cross and CSMA/CA-based contending traffic. It is also mitigating the effect ofinterference. We also show how to achieve the stationary state behaviour of the system to limit the numberof probe packets. On simulation, Bandwidth Probe gives a accurate estimation of the available bandwidthusing average convergence time and lower intrusiveness.
In search of better statistics for traffic characterization
Taralp, Tarkan;Devetsikiotis, Michael;Lambadaris, Ioannis;
Journal of the Brazilian Computer Society , 1999, DOI: 10.1590/S0104-65001999000100002
Abstract: we model and simulate stochastic traffic based on two established statistics: marginal distribution and autocorrelation function. although apparently equivalent to each other in these aspects, the three different synthetic models produce notably different behavior in a g/d/1/¥ queue. as an alternative modeling strategy, we measure the log-moment generating function of the synthetic models. our results indicate that recent works related to effective bandwidth functions may provide the discriminatory statistic required to explain the noted inconsistency.
Advaced Spatio-Temporal Thermal Analysis of Electronic Systems
Miroslav Hrianka,Lubomir Tarovsky
Advances in Electrical and Electronic Engineering , 2003,
Abstract: The article gives a brief review the of diagnostics and analysis possibilities by a spatio-temporal approach into electronic system in infrared bandwidth. The two dimensional image grabbed by the thermo vision camera provides information about the surface temperature distribution of an electronic system. The main idea is based on the analysis of the object which consists of a temporal sequence of a spatial thermal images. Advanced analysis is achieved by morphological image gradient spatio-temporal model: The mentioned method provides a total temperature system evaluation as well as it allows separate analysis in the chosen determined temperature area.
New Services Development
Peter Ciganek,Robert Hudec
Advances in Electrical and Electronic Engineering , 2004,
Abstract: Dynamic changes in traditional technologies and rising of new technologies call for development of new services. If service providers want to stay on information technologies market, they must keep track with this trend and adjust their services to customer requirements or develop new services. New applications will mainly depend on communication bandwidth and end users ability to handle it. If network providers will be able to ensure necessary bandwidth, there will be nothing that can stop service providers and developers in new service development. People know about growing necessity of new service and ask for them, but they hardly understand that the most important thing for service providers is merchantability and economic return of resources they gave to the development and implementation. By the lack of flexible development environment that is able to develop, test and provide final service for operation, new service development is not easy. There are different new service design procedures for various technological and user areas. This is the reason why this paper provides brief description of new service development procedure from technological and administrative point of view.
Improving Ad Hoc Network Performances by Estimating Available Bandwidth
K. Mohideen Vahitha Banu
International Journal on Computer Science and Engineering , 2010,
Abstract: The term bandwidth refers to the data rate that a network link or a network path can transfer. Bandwidth is one of the guarantee attribute to measure the performance of the network. Measuring available bandwidth in ad hoc networks is a challenging issue in Mobile Ad hoc Network (MANET). In this paper, the new technique is proposed to evaluate the accurate available bandwidth in ad hocnetworks. This technique considers reducing backoff time, node’s and link’s capability. By these network flows, the amount of bandwidth is wasted. Estimating accurate available bandwidth allows a node to make an optimal decision before sending a packet in networks.
Effective cum Efficient Bandwidth by LZW Compression Technique
Indian Journal of Computer Science and Engineering , 2012,
Abstract: The Internet and World Wide Web (WWW) have made electronic commerce a reality. According to an estimate the WWW presently contains more than 800 millions pages, encompassing about 6 terabytes of textdata on about 3 million servers. As the number of web users is increasing rapidly, there is a need to build fast and efficient systems for handling users requests on the web. Jakob Nielsen's figures from his keynote talk at the QualityWeek 1999 Conference & Exhibition suggest that the webpage should be received within 7 seconds after the request from the user. The real answer to "too slow" probably is more subjective, but at the same time probably not too terribly different. The WebSite sever is configured properly and effectively when it has "enough capacity to meet the customer demands." Estimating the actual capacity of a WebSite server requires a variety of different types of analyses. There are many deep, highly technical methods for calculating the capacity of a server to meet imposed load. However, a more practical way is to simply measure the perceived response time accurately, and scale up server capacity to make sure that maximum real-user experiences don't exceed unacceptable delays.
Efficient Resource Scheduling in Data Centers using MRIS
Indian Journal of Computer Science and Engineering , 2011,
Abstract: Scheduling the resources is decisive in shared data centers. Today scheduling algorithms focus only on onedimensional resource models, infact the multiple resources (e.g. Memory, Storage, CPU and Networkbandwidth) can be consumed concurrently. There is a lot of demand for multiple resources in cloud computing which allows various users to share a data center. This paper depicts resource scheduling problemto a bounded multi-dimensional knapsack problem, taking into account the requirement dependency among multi-dimensional resources. Due to the NP hardness of B-MDKP, we present Multi-dimensional ResourceIntegrated Scheduling (MRIS), an inquisitive algorithm to obtain the approximate optimal solution. MRIS will be highly efficient and achieves high performance for a various set of workloads.
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