Diagnosis of Mental Stress using Statistical Analysis and Wavelet Transformation of Electrocardiogram (ECG) Signal
The present work deals with the method to distinguish ECG signal of a normal person and
mentally stressed person. Time series analysis and unit root test has been applied to established that
they are auto regressive (AR) and non stationary process. A generalized deterministic mathematical
model of the normal and mentally stressed patient has also been suggested by applying the Yule
Walker method. Hence the wavelet transform based Semblance analysis has been applied to extract
features from the ECG signals.
Detection of Distributed Denial of Service Using Honeypots
Honeypots is a resource which pretends to be a real target, so that we can protect the real resource or service from the malicious users/hackers and know their intentions and attack patterns. In this paper, we present a security solution whereby we deploy three fake services on three ports on the server. These act as bait to the hacker and whenever one tries to access, we close the connection and know the IP address and the ports from which it is establishing the connection, and store it in a database. On a large number of connection attempts on these fake services, the IP addresses are deemed as malicious users and they are denied connection on the main service and their report is given to the admin, so that we can manually block or unblock the IP addresses and can identify the location and take requisite action.
A Review on Investigation on Mechanical Properties of Aluminium Micro and Nano Composites Produced by Stir Casting
The concept of composite A composite material is a material made from two or more
constituent materials with significantly different physical or chemical properties that, when
combined, produce a material with characteristics different from the individual components. The
individual components remain separate and distinct within the finished structure. The new material
may be preferred for many reasons: common examples include materials which are stronger, lighter,
or less expensive when compared to traditional materials. Aluminium matrix composites (AMCs)
have the potential to offer desirable properties, including low density, high speciûc strength, high
speciûc stiffness, excellent wear resistance and controllable expansion coefficient, which make
them attractive for numerous applications in aerospace, automobile, and military industries.
Normally micron-sized particles are used to improve the ultimate tensile and yield strengths of the
matrix, but the ductility of the AMCs deteriorates signiûcantly with high particle concentration. It
is of interest to use nano-sized particles to strengthen the matrix, while maintaining good ductility,
high temperature creep resistance and better fatigue resistance. Aluminium matrix composites
(AMCs) reinforced with micro and nano-sized Al2O3 particles are an interested group of advanced
materials, which are widely used for high performance applications such as automotive, military,
aerospace and electricity industries.The composites possess improved physical and mechanical
properties such as superior strength to weight ratio, good ductility, high strength and high modulus
,low thermal expansion coefficient, excellent wear resistance, excellent corrosion resistance, high
temperature creep resistance and better fatigue strength.
Implementation of Fast Fourier Transform Using Verilog with Improved Technique
The Discrete Fourier Transform (DFT) can be implemented very fast using Fast Fourier Transform (FFT). It is one of the finest operations in the area of digital signal and image processing. FFT is a luxurious operation in terms of MAC. To achieve FFT calculation with a many points and with maximum number of samples the MACs requirement could not be matched by efficient hardware’s like DSP. So a fine solution is to use dedicated hardware processor to perform efficient FFT working out at high sample rate, while the DSP could perform the less concentrated parts of the processing. Verilog implementation of floating point FFT with reduced generation logic is the proposed architecture, where the two inputs and two outputs of any butterfly can be exchanged hence all data and addresses in FFT dispensation can be reordered
Employing Capillarity in Pore Radius Estimation in Hardened Cement Paste
Concrete is an inherently porous material. Pores have been classified in terms of pore size distribution parameters. Mean radius or equivalent radius has also been used in the assessment of porous material like concrete and it has been related to other parameters like water-cement ratio, degree of hydration, age etc. Different methods are used to estimate such a radius and overall radii distribution, Mercury Intrusion Porosimetry being the most common. The method has yielded appreciable results within its limitations and they have been extensively studied. But it is quite cumbersome to carry out and becomes increasingly costly for higher pressure applications. Other methods like water retention curves and imaging of individual pores require a lot of effort to generate statistically significant results.
This paper presents the result of an effort to carry out pore radius estimation in essentially cement paste samples using the phenomenon of capillary absorption of water. Capillarity in porous materials is governed by the Lucas-Washburn equation to an appreciable extent. Five water-cement ratios(0.2,0.3,0.4,0.5,0.6) and five curing ages(1,3,7,28,90 days) have been used to widen the scope and observe the trends. Results have been compared with the MIP results from an earlier study in the same laboratory. The magnitude found for the effective pore sizes through Lucas Washburn Equation are two to three orders smaller than the corresponding mean pore radius as obtained in MIP studies. But the comparison trends between w/c ratios and curing ages are seen to be largely similar. It is believed that this parameter might be used for the purpose of comparative evaluation of materials based on actual rates of absorption.
Modeling Simulation and Harmonic Analysis of a Series Resonant Inverter Feeding RL Load: Considering Transformer Parameters
Series Resonant Inverter (SRI) is a source of very high frequency energy and is used for high frequency applications, such as Induction heating, Metal and thin film plastic surface treatment, communication and AC power flow areas (HVDC and HVAC) etc. SRIs are linked with the load through high frequency transformers to improve the current gain. Inclusion of transformers and RL load leads to higher frequency harmonic components in the load voltage. The present papers includes the harmonic analysis of a basic SRIs (Class – A), feeding RL load with the consideration of transformer parameters. System is modeled first in continuous time domain and then harmonic analysis is carried out using MATLAB/SIMULINK which is extended to the filtering out the higher frequency harmonic components using Butterworth IIR filter.
On the Rainfall in Marathawada and the Need for Farmers to have an Alternative Source of Income
: In this work the rainfall in Marathawada is studied, and possible source of rainfall erraticism is analyzed. Based on the historical data, prediction of rain in the year 2015 is made. Since the rain amount varies widely from year to year, it would be advisable for the farmers to have an alternative for irrigation or have alternate sources of income. Since the prediction is being made well in advance on December 2, 2014 i.e. the date of completion of the manuscript, , it gives sufficient time to farmers to select future course of action if the technique demonstrated here is followed subsequently.
E-epidemic Model of Computer Worms with Random Coefficients in the Network
In epidemiology, lots of mathematical models are developed by using the system of
differential equations and many of the systems have used the parameters as deterministic variables.
In this paper, the variables, which are used in the system, are considered as random variables with
specified distributions because the equations with random coefficients are better in describing the
real behavior of the parameters as compared to deterministic coefficients. A stochastic spectral
representation of the parameters is used. Numerical methods and polynomial chaos method are used
to simulate and obtain the evolution of the mean and higher – order moments with respect to time.
Present Status and Future Possibilities of Growth of Solar Energy in India
The sun can be one of the most possible powerful renewable energy sources. Solar energy
is finite energy resources to meet up long term global energy crisis. The recent energy crisis and
environmental burden are becoming increasingly urgent and drawing enormous attention to solarenergy
utilization. The present study is intended to review on recent advances in developing the STE
and SPV technologies for solar power generation. Capturing and using just the sunlight which hits
the earth in one day could provide enough energy for the entire world all year. Solar power has the
immense capacity to bring in stability to the fluctuating electricity tariffs in India as it is cheaper than
thermal and domestic coal. We have realized that solar radiation in the worst part of India is better
than the best part of Europe. In India, the electricity demand is drastically increasing. Solar Thermal
(STE) and Photovoltaic Electricity (SPV) technology can be implemented in India as solar resources
and large wasteland areas are widely available in the country. Solar thermal energy is finite energy
resources to meet up long term global energy crisis. The recent energy crisis and environmental
hazards are drawing enormous attention to solar-energy utilization. The utilization of solar energy in
India has got prime importance in the present scenario of energy crisis in the country
Intrinsic Shapes of Elliptical Galaxies: ngc 5638 and ngc 5813 Using Modified Prior
We determine the intrinsic shapes of the light distribution of elliptical galaxies NGC 5638 and NGC 5813 by combining the profiles of photometric data from the literature with triaxial models. We use ensembles of models so that the shape estimates are largely model independent. We follow the methodology as described in Statler (1994) which is modified to suit our requirements. We find that short to long axial ratios at very small radii and at very large radii, and the absolute value of the triaxiality difference are the best constrained shape parameters. We use a modified prior as obtained from the shape estimates of a large sample of elliptical galaxies to determine the intrinsic shapes of the elliptical galaxies NGC 5638 and NGC 5813. Shape estimates using modified prior should be more reliable. These results are compared with the previous estimates which are determined by using flat prior reported by Chakraborty et al (2008) and Singh and Chakraborty (2009).
The plot shows the intrinsic shapes of the NGC 5638 and NGC 5813 as a function of (q0,q∞) for two dimensional shapes and (q0,q∞,|Td|) for three dimensional shapes, where q0 and q∞(=q) are the short to long axial ratios at small and at large radii and |Td| is the absolute values of the triaxiality difference, defined as |Td|= |T∞ - T0|. The probability is shown in the dark grey region: darker is the region higher is the probability. We find that both the galaxies NGC 5638 and NGC 5813 are rounder inside and flatter outside.