A new S2 and S3 sound detection by using the heart rate signal taken from dorsalis pedis artery as a reference is presented in this paper. This approach aims to evaluate the accuracy of the S1 and S2 sounds detection ...
A new S2 and S3 sound detection by using the heart rate signal taken from dorsalis pedis artery as a reference is presented in this paper. This approach aims to evaluate the accuracy of the S1 and S2 sounds detection by using dorsalis pedis pulse measurement as a reference. The dorsalis pedis pulse was measured by using MAX 30100 sensor controlled by a microcontroller. Meanwhile, the heart sounds were captured by using the ECG device. The measurement was taken for 5 minutes for a total of ten male and ten female subjects, with the age of 20 years old. This experiment has been conducted several times, and the average was calculated and compared to the existing solution. This proposed approach gives a small error compared to the standard S1 and S2 detection, leading it to be an acceptable and promising solution of a detection method.
In recent years many of the people are suffering from diabetics which may result damaging the human eye sights by damaging the blood vessels of the retinal by form exudates around the optic disc. In this paper, we int...
In recent years many of the people are suffering from diabetics which may result damaging the human eye sights by damaging the blood vessels of the retinal by form exudates around the optic disc. In this paper, we intend to build retinal exudates from fundus image to predict the severity of diabetics resulting in blood vessels tissue damages. In order to analysis the blood vessels damage and diabetic severity initially we use appropriate image pre-processing techniques to remove any noise from the retinal funds image, to remove the noise in this paper we use wavelet transform and first order Gaussian derivative and matched filter to segment the fundus image by rotating the original image by certain angle. The filtered data is stored in the matched filter bank, then by applying k-NN clustering technique to identify minimum value in each filter bank and marking such minimum value center of k-nearest neighbor value. Further, Support vector machine a supervised learning algorithm is applied to the identified k-nearest neighbor values thereby predicting the severity of blood vessel tissue damage from the fundus image.
The concept of mantle cloaking is applied to suppress the undesired cross-coupling among the antenna elements of two tightly spaced and interleaved phased antenna arrays used in 5G wireless applications, which in turn...
The concept of mantle cloaking is applied to suppress the undesired cross-coupling among the antenna elements of two tightly spaced and interleaved phased antenna arrays used in 5G wireless applications, which in turn enhances the radiation characteristics of the arrays. It is demonstrated that the specifically designed metasurface cloaks decouple the antenna elements of two different arrays and enable to restore the original radiation patterns of the isolated arrays, such that the antenna arrays placed in close proximity of each other can radiate independently for a wide range of beam scanning angles. This paper illustrates microstrip antenna arrays with elliptically shaped metasurface cloaks integrated in printed technology. The simulation results validate the fact that by encasing the elements of the arrays with their respective cloaks, it is not only possible to eliminate the cross coupling but also to restore the radiation properties of the antenna arrays within the frequency bands of their operation.
This paper describes new algorithms for spread spectrum time domain reflectometry (SSTDR) for detecting and locating faults in photovoltaic (PV) panels. Specifically, we present a new method for identifying the impeda...
This paper describes new algorithms for spread spectrum time domain reflectometry (SSTDR) for detecting and locating faults in photovoltaic (PV) panels. Specifically, we present a new method for identifying the impedance of multiple loads (such as PV panels) on a single transmission line. This method is based on adapting a well-known algorithm, known as orthogonal matching pursuit, to match simulated waveforms with multiple reflections in an SSTDR waveform. We demonstrate that our method successfully extracts waveform data from the SSTDR experiments and correctly estimates load impedances corresponding to reflections in this waveform data. We experimentally demonstrate that our method correctly estimates the capacitance values of various capacitive loads on a transmission line with an error as low as4%.
In this paper, a novel distributed control strategy addressing a (feasible) psycho-social-physical welfare problem in islanded Direct Current (DC) smart grids is proposed. Firstly, we formulate a (convex) optimization...
详细信息
The object of analysis is the casing of F124 turbofan engine. Analysis of load conditions indicates that a dimensioning load case is crash landing, while an axial component of inertial load is about 30g. The casing is...
The object of analysis is the casing of F124 turbofan engine. Analysis of load conditions indicates that a dimensioning load case is crash landing, while an axial component of inertial load is about 30g. The casing is a thin-walled ribbed shell made of titanium alloy. The aim of the paper is mass analysis of the casing subjected to axial compression. Comparative analysis of selected materials, i.a., a sandwich structure (metal-fibre laminate) made of titanium alloy faces and flax fibre core, is performed using a finite element method. In the case of a sandwich structure, a shift of titanium layers from a neutral surface of the shell is significant since it causes a decrease in titanium overall thickness compared to a reference plain model (without decreasing bending stiffness). The best material mass efficiency were obtained for a sandwich structure and it is over 40% higher compared to a plain isotropic structure, whereas, in the case of the original ribbed structure the efficiency is about 26% higher.
Nowadays, large aircrafts such as Boeing 787 and Airbus A350 are built in fifty percent of composites (e.g. CFRP, GFRP or Glare). Composites, in general, are brittle and more notch sensitive material than metal alloys...
Nowadays, large aircrafts such as Boeing 787 and Airbus A350 are built in fifty percent of composites (e.g. CFRP, GFRP or Glare). Composites, in general, are brittle and more notch sensitive material than metal alloys. Therefore, mechanical joints of composite parts require a special attention during both the designing and manufacturing process. In the paper, a review of modelling methods for a pin loaded laminate is presented. The simulation of a specimen made of quasi-isotropic CFRP laminate was carried out. Nonlinear analysis was performed using Newton-Raphson method with ***. The specimen load capacity was estimated using the maximum stress and Hashin failure criteria in quasi-linear as well as in progressive failure analyses. Failure indices and bearing curves for various contact descriptions (node to segment analytical and discrete, segment to segment and using simplified kinematic ties) and two models of a laminate structure (single layer model and eight orthotropic plies) were compared. The assumed criterion and properties of a failure progressive analysis strongly influence the results. The gradual stiffness reduction analysis with displacement loading in a single layer model results in the upper estimation of the specimen load capacity.
The underwater acoustic channel is a difficult communication medium due to its variable link quality which depends on location, time and the *** paper reports on underwater channel characterization for shallow water (...
The underwater acoustic channel is a difficult communication medium due to its variable link quality which depends on location, time and the *** paper reports on underwater channel characterization for shallow water (< 100 m) in the Atlantic offshore of Halifax, Canada. The underwater channel characteristics drives the level of multi-domain robot collaboration possible to characterize a floating target both above- and below-water. RF communications is used between the topside unmanned surface vehicle and unmanned aerial vehicle. Underwater, acoustic modems are used between the submerged part of the unmanned surface vehicle and the unmanned underwater vehicles. The outcome is a multi-domain picture of the floating target from the sensors on these collaborating *** deployment, simulations were performed with a tool that integrates BELLHOP and newly developed complementary analysis capabilities in a MATLAB framework to determine operational ranges from range-dependent attenuation. The main contributions are an underwater acoustic environment-informed approach to placing mobile communicating nodes in a network, the network’s range predictions, channel analysis and a user-friendly GUI to manage the BELLHOP inputs and outputs. The approach and tools are validated in simulations and verified in-water. Transmission losses (TL) and underwater channel characteristics for illustrative cases are presented.
The strength of mechanical joints is the weakness of laminates, therefore, mechanical joints require a special attention to be focused during both a designing and a manufacturing process. The aim of the paper is to pr...
The strength of mechanical joints is the weakness of laminates, therefore, mechanical joints require a special attention to be focused during both a designing and a manufacturing process. The aim of the paper is to present sensitivity analysis of a mechanical joint in a composite structure on selected parameters. Parameters of this analysis were classified into four groups: geometrical, stiffness, material failure and initial stress. Global stiffness and strength of laminate, two methods of the nut washer and the bolt head modelling, residual stiffness, initial delamination and other parameters were taken into account. A double-shear bolted joint with four fasteners is the object of analysis. The inner part of the specimen was made of a quasi-isotropic CFRP laminate. The outer elements were made of 2024T3 aluminum alloy sheet, typically used in aircraft structures. Nonlinear finite element analysis of a metal-composite joint was performed using Newton-Raphson method with MSC. Marc code. The numerical and the experimental results were compared.
The paper considers iterative learning control for differential and discrete linear systems with control input saturation. A new design is developed based on the use of a full state observer in combination with the me...
详细信息
The paper considers iterative learning control for differential and discrete linear systems with control input saturation. A new design is developed based on the use of a full state observer in combination with the method of vector Lyapunov functions and dissipativity theory for repetitive processes. An example demonstrating the features and advantages of the new design is given.
暂无评论