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Higher Order Spectra based Features for Infant Cry Signal Classification
( M. Hariharan ),( Yogesh C. K. R. Sindhu ),( Vikneswaran Vijean ),( Haniza Yazid ),( Thiyagar Nadarajaw ),( Kemal Polat ),( Sazali Yaacob ) 한국감성과학회 2017 한국감성과학회 국제학술대회(ICES) Vol.2017 No.-
Crying is an early communication medium for infants. The cry analysis provides an opportunity to assess the physical and pathological status of infants. Several short-term cepstral/spectral features were extracted from the recorded cry signals to detect the reason for crying (hunger, pain, sick condition etc). In this work, Higher order spectra (HOS) based features were proposed to study its efficacy in better representation of cry signals. Statistical features from Bi-spectral plots were derived. Two well-known short-term feature sets known as Mel-frequency cepstral coefficients (MFCCs) and Linear predictive coding based cepstral coefficients (LPCs, Linear predictive cepstral coefficients- LPCCs and weighted LPCCs) were also used. Cry signals from 2 different databases were utilized. Several experiments of twoclass and multi-class classification of cry signals were conducted and the results were reported to demonstrate the effectiveness of the proposed method. The experimental results indicate proposed combination of HOS based features with standard short-term cepstral features help to achieve promosing infant cry classification accuracy.
Hariharan, Palamarneri Sivaraman,Mothi, Ebrahim M.,Moon, Dohyun,Anthony, Savarimuthu Philip American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.48
<P>Halochromic isoquinoline attached mechanochromic triphenylamine, N-phenyl-N-(4-(quinolin-2-yl)phenyl)benzenamine (PQPBA) and tris (4-(quinolin-2-yl)phenyl) amine (TQPA), smart fluorescent materials exhibit thermo/mechanochromism and tunable solid state fluorescence and their unusual halochromic response in PMMA matrix have been used for fabricating rewritable and self erasable fluorescent platforms. PQPBA and TQPA showed strong fluorescence in solution (Phi(f) = 0.9290 (PQPBA) and 0.9160 (TQPA)) and moderate solid state fluorescence (Phi(f) = 20 (PQPBA) and 17% (TQPA). Interestingly, they exhibited a rare temperature (0-100 degrees C) dependent positive fluorescence enhancement via activating radiative vibrational transition. The deaggregation of PQPBA and TQPA in PMMA polymer matrix lead to the enhancement of fluorescence intensity strongly and fabricated strong blue fluorescent thin films (Phi(f)=58% (PQPBA) and 54% (TQPA). The halochromic isoquinoline has been exploited for demonstrating reversible off-on fluorescence switching by acid (TFA (trifluoroacetic acid)/HCl) and base (NH3) treatment in both solids as well as PMMA thin films. Importantly, rewritable and self-erasable fluorescent platform has been achieved by make use of unusual fluorescence responses of PQPBA/TQPA with TFA/HCl after exposing NH3. Single crystal and powder X-ray diffraction (PXRD) studies provided the insight on the solid-state fluorescence and external stimuli-induced fluorescence changes.</P>
Stress relaxation and its effect on tensile deformation of steels
Hariharan, K.,Majidi, O.,Kim, C.,Lee, M.G.,Barlat, F. Scientific and Technical Press ; Elsevier Science 2013 Materials & design Vol.52 No.-
The tensile deformation of metallic materials, when interrupted without unloading, exhibit relaxation of stress. The stress relaxation phenomenon can alter the mechanical behavior of the materials. Stress relaxation phenomenon during tensile test is studied in three steel grades with different microstructures. The influence of stress relaxation on uniform elongation has not been reported before. The uniform elongation varies with strain at which material relaxes and is found to increase upto 3.5%. Contradicting with the published results, the stress drop during stress relaxation varies with strain and the possible reasons are explained. The stress drop during relaxation is governed by strain hardening mechanism in low carbon steel and strain aging mechanism due to martensite in dual phase (DP) and transformation induced plasticity (TRIP) steels.
A Novel Multi-objective Genetic Algorithms-Based Calculation of Hill’s Coefficients
Hariharan, K.,Chakraborti, N.,Barlat, F. d.,Lee, M. G. Springer Science + Business Media 2014 Metallurgical and Materials Transactions A - Physi Vol.45 No.6
<P>The anisotropic coefficients of Hill's yield criterion are determined through a novel genetic algorithms-based multi-objective optimization approach. The classical method of determining anisotropic coefficients is sensitive to the effective plastic strain. In the present procedure, that limitation is overcome using a genetically evolved meta-model of the entire stress strain curve, obtained from uniaxial tension tests conducted in the rolling direction and transverse directions, and biaxial tension. Then, an effective strain that causes the least error in terms of two theoretically derived objective functions is chosen. The anisotropic constants evolved through genetic algorithms correlate very well with the classical results. This approach is expected to be successful for more complex constitutive equations as well.</P>
M.Mahalakshmi,Dr.G.Hariharan 장전수학회 2016 Proceedings of the Jangjeon mathematical society Vol.19 No.2
Wavelet transform is a recently developed mathematical tool in applied mathematics. In this paper, a mathematical model by Hayes et al. [1] of porous the concentration of species arising from enzyme kinetics is discussed. The proposed model involves the nonlinear steady state reaction diusion type. The Hermite Wavelet Method (HWM) is employed to obtain the analytical solution for non-linear reaction-diffuusion equation. The proposed method is a powerful and easy to use analytical tool for linear and non-linear problems. To the best our knowledge, until there is no rigorous Probabilists Hermite poly- nomials based solutions has been reported for the proposed model. Numerical applications are given to demonstrate the validity and applicability of the pro- posed method.
M.salai mathi selvi,G.hariharan 장전수학회 2017 Proceedings of the Jangjeon mathematical society Vol.20 No.3
A mathematical model of dynamic form of the Michaelis-Menten enzy- matic reaction model is discussed. In this paper, we have applied Legendre spectral algorithm for solving the time dependent Michaelis-Menten enzy- matic reaction equations. To the best of our knowledge until there is no rigorous Legendre wavelet solution has been reported for the above men- tioned model. From the Legendre spectral solutions, we are then able to analyze the efficiency of the enzymatic reaction model parameters on the solutions to the dynamic Michaelis-Menten enzymatic reaction equations. The numerical results demonstrate the accuracy and efficiency of the pro- posed spectral approach. The Legendre computational matrix method (LCMM) is shown to be a rather useful and efficient tool for constructing analytical solutions to the dynamic Michaelis-Menten enzymatic reaction equations. Convergence analysis of the proposed method is discussed. Some illustrative examples are given to demonstrate the validity and ap- plicability of the proposed method.
Das, M.,Du, Y.,Mortensen, J.,Ribeiro, O.,Hariharan, P.,Guan, L.,Loland, C.,Kobilka, B.,Byrne, B.,Chae, P. THE ROYAL SOCIETY OF CHEMISTRY 2017 Chemical Science Vol.8 No.2
<P>Amphiphile selection is a crucial step in membrane protein structural and functional study. As conventional detergents have limited scope and utility, novel agents with enhanced efficacy need to be developed. Although a large number of novel agents have been reported, so far there has been no systematically designed comparative study of the protein stabilization efficacy of stereo-isomeric amphiphiles. Here we designed and prepared a novel class of stereo-isomeric amphiphiles, designated butane-1,2,3,4-tetraolbased maltosides (BTMs). These stereoisomers showed markedly different behaviour for most of the targeted membrane proteins depending on the chirality of the linker region. These findings indicate an important role for detergent stereochemistry in membrane protein stabilization. In addition, we generally observed enhanced detergent efficacy with increasing alkyl chain length, reinforcing the importance of the balance between hydrophobicity and hydrophilicity in detergent design. The stereo-isomeric difference in detergent efficacy observed provides an important design principle for the development of novel amphiphiles for membrane protein manipulation.</P>