We quantified the user-perceived quality for a VoIP application running in an encrypted wireless network and we experimentally determined the maximum number of parallel VoIP calls that can be achieved, at the best qua...
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We quantified the user-perceived quality for a VoIP application running in an encrypted wireless network and we experimentally determined the maximum number of parallel VoIP calls that can be achieved, at the best quality of the speech signal. We studied the behaviour of the application for four encryption mechanisms and for each of them we measured the bandwidth waste due to encryption. We used the ITU-T PESQ score to objectively assess the quality of the speech signal. In this paper we present the test setup and the tools we used for our experiments, as well as our experimental results and conclusions.
This paper describes the development of GTBoT, a multipurpose robot platform. The design of this robot includes mechanical, electrical and software development. The key features of the robot are the indoor operation, ...
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ISBN:
(纸本)9781424467242;9781424467228
This paper describes the development of GTBoT, a multipurpose robot platform. The design of this robot includes mechanical, electrical and software development. The key features of the robot are the indoor operation, low costs and easiness to use and to repair. The main issues solved in the present project are about the autonomous navigation using an algorithm for recognizing the surrounding environmental. There is a construction system within the robot, used for applications that need collection and construction. As a result, this robot took part on the international competition of robotics, Eurobot 2009.
In this paper, we propose a multiobjective stochastic model with linear partial information on probability distribution (MSPLI) for portfolio selection problem. We apply an extended chance constrained compromise progr...
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Any person involved in R&D activities is aware about the importance of testing. Depending on the type of R&D field, test associated costs can vary between 25% of the total costs to 80%. The importance of this ...
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ISBN:
(纸本)9781424467242;9781424467228
Any person involved in R&D activities is aware about the importance of testing. Depending on the type of R&D field, test associated costs can vary between 25% of the total costs to 80%. The importance of this activity is not always fully understood nor financially supported. Also, the high pressure put on reducing the time to market (TTM) for new products leads to reductions being made sometimes in the detriment of the testing activities. Therefore the efficiency and speed of the testing processes, in different stages of the product development, has to increase with every intended reduction for the TTM. This paper presents an integrated test platform which targets the testing of electronic control units (ECUs) from the automotive field as well as other industrial controllers and hardware solutions. It includes the hardware test equipment and the software tools developed for this purpose.
We investigate the plasmonic responses of gold nanoparticles (AuNP) coated and uncoated on 40nm gold thin film with surrounding medium having different refractive indices using Surface Plasmon Resonance (SPR) ellipsom...
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ISBN:
(纸本)9781439834152
We investigate the plasmonic responses of gold nanoparticles (AuNP) coated and uncoated on 40nm gold thin film with surrounding medium having different refractive indices using Surface Plasmon Resonance (SPR) ellipsometry. The bulk sensitivities obtained from the measurements in both the cases are found to have same order of magnitude. However SPR dip in case of AuNP coated gold thin film has been shifted to longer wavelength (near IR) as compare to the bare gold thin film under the same environment and condition. Hence, it could provide a good platform to study biomolecular interaction where the absorption of light by the biomolucules is minimal. By monitor the induced changes in polarization state or phase of reflected light from the sample surface, which depend on surface properties of the sample, we use these changes as a sensor signal and compare that with theoretical simulation. This kind of characterization technique is non-destructive, label free and it has high sensitivity and sub-nanometer thickness resolution.
Edge detection plays a significant role in assessing the capability level of the robot's vision. Accurate edge detection leads to better vision. The work in this paper was conducted by the inspiration of the biolo...
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Edge detection plays a significant role in assessing the capability level of the robot's vision. Accurate edge detection leads to better vision. The work in this paper was conducted by the inspiration of the biological concept of mammalian vision. That is, the retina enriches the edges in the view before passing it to the visual cortex in the brain for further processes. Although many works have been done to investigate surrounding this issue, these works are still limited in compare with that exists in retina. In this study, we investigated the main role of horizontal cells for the retina's network toward building a retina-like robot's vision technique. Experimental results show the validity of the proposed algorithm to provide accurate edges in real-time with less noise.
We have been developing a new approach to layered hybrid (inorganic/organic) photovoltaic materials for fabrication by Roll-to-Roll (R2R) manufacturing. In this report, we combine the low cost and processability of or...
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Collaboration networks are social networks in which relationships represent some kind of professional collaboration. The study of collaboration networks can help identify members that are important or influential with...
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Collaboration networks are social networks in which relationships represent some kind of professional collaboration. The study of collaboration networks can help identify members that are important or influential within a given community. This work is divided into two parts. The first part is a study of the topological properties of two collaboration networks: the global collaboration network and the Brazilian collaboration network of authors of scientific papers within the area of Computer Science. The second part presents a ranking metric for vertices based on the intensities of their relationships. Using the proposed metric and other more classical metrics, we rank the researchers in Brazil in Computer Science. The proposed metric was compared with subjective evaluation of researchers made by CNPq. The results show the effectiveness of the proposed metric in identifying influential researchers when compared to another metrics in the literature.
The cross plane thermal conductivity of CuFeSe2 thin film was determined by differential 3 omega technique with a deposited Au-Cr narrow strip as the microprobe. The microprobe was driven by an AC current at frequency...
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ISBN:
(纸本)9781605950150
The cross plane thermal conductivity of CuFeSe2 thin film was determined by differential 3 omega technique with a deposited Au-Cr narrow strip as the microprobe. The microprobe was driven by an AC current at frequency ω and result a third-harmonic voltage corresponding to the temperature drop for the calculation of thermal conductivity across the thin film. In order to obtain the accurate data by excluding the influence of thermal resistance of interfaces between film and substrate, a series of thin films with various thickness of 200, 400, 600 and 800 nm were prepared for systematic study. Basically the thermal conductivity is linearly dependent on temperature for T=100-350 K. One interesting finding is that the thinner the film the larger the thermal conductivity. For example, at 300 K the thermal conductivity of the 200 nm thin film is about 8.8 W·m-1·K-1, whereas the thermal conductivity of 600 and 800 nm films are 2.4 and 1.7 W·m-1·K-1 respectively. This consequence is attributed to the better crystallization in thinner films that was confirmed by X-ray diffraction analysis.
This paper represents a novel microfluidic device for simple refractive index (RI) measurement of fluid sample with sub microliter volume. The defocusing imaging technique using a three pinhole aperture plate is imple...
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This paper represents a novel microfluidic device for simple refractive index (RI) measurement of fluid sample with sub microliter volume. The defocusing imaging technique using a three pinhole aperture plate is implemented for the refractive index measurement. For the self-calibration, the microfluidic device has a measurement region and a self-calibration region, and both regions are designed to be captured on single image frame. Thus, the refractive index of a sample fluid is automatically calculated with the self-calibration. For the demonstration of the proposed device, standard refractive index liquids with the refractive indices of 1.300, 1.400, 1.500, 1.600 and 1.700 are used. The measured refractive index has the maximum deviation of 0.0036 (0.24%) from the standard refractive index values.
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