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Stress Relaxation for Formability Improvement
Hariharan, Krishnaswamy,Majidi, Omid,Kim, Chong Min,Lee, Myoung Gyu,Barlat, Fré,dé,ric Trans Tech Publications, Ltd. 2013 Key Engineering Materials Vol.554 No.-
<P>Improved formability has been reported due to stress relaxation when the continuous forming cycle is interrupted with steps by adjusting the punch motion. The contribution of stress relaxation and its parameters on the ductility of materials has not been established so far. In the present work, the stress relaxation behavior of three materials, low carbon steel, DP and TRIP steels are studied. The influence of strain rate and strain on the ductility enhancement due to stress relaxation is analyzed. It is observed that stress relaxation improved the ductility of materials in all the cases and therefore can be used as a potential method to improve formability in sheet metal forming.</P>
Recent Advances in Infant Cry Signal Analysis and Emotion & Stress Recognition using Speech Research
( Hariharan Muthusamy ) 한국감성과학회 2017 한국감성과학회 국제학술대회(ICES) Vol.2017 No.-
Crying is a common symptom in the first 3 months of life and carries the information about the neurological and medical status of infants. According to statistics in 2015, Highest rate of infant deaths within the first year of life was recorded in the Africa region (55 per 1000 live births) than the European region (10 per 1000 live births). Every year, 15 million babies are born too early and this number is rising. The rate of preterm birth ranges from 5% to 18% of babies born across 184 countries. These statistics are completely independent of the information present in the infant cries. Early detection of risks for vulnerable children would allow implementing prevention strategies and policies in childhood. The aim of this research is to examine the ability of information embedded in infant cries to distinguish between several pathologies thereby cry analysis could be applied successfully in diagnostics and in the early detection of the infant at risk for developmental difficulties. Human beings use different forms of gestures, facial expressions, body languages and speeches for communication. These communications convey both messages and emotional states of the speakers. A speech signal carries the speaker’s linguistic information and also his/her gender, age, ori- gin and emotional states. ERS usually comprises four stages: pre-processing, feature extraction, feature selection and classification/recognition of emotion from speech signals. The aim of this research is to use both speech and its glottal waveforms to distinguish six different types of emotions and different style of speech under stress.
Hariharan, P. S.,Venkataramanan, N. S.,Moon, Dohyun,Anthony, Savarimuthu Philip American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.17
<P>A triphenylamine-based fluorophore, 4-((4-methoxyphenyl)(phenyl)amino)benzaldehyde (<B>1</B>), exhibits external-stimuli-responsive self-reversible solid-state fluorescence switching, tunable fluorescence, and a rare phenomenon of temperature-dependent fluorescence. Mechanically grinding a crystalline powder of <B>1</B> converts the blue fluorescence (λ<SUB>max</SUB> = 457 nm) to green (λ<SUB>max</SUB> = 502 nm), but blue fluorescence robustly self-recovers within 8 min. X-ray analysis and theoretical studies suggest that the change from a highly twisted molecular conformation and crystalline form into an amorphous phase with more planar conformation is responsible for the fluorescence switching. Self-reversible fluorescence switching did not show a significant change in fluorescence for several cycles of measurement. Interestingly, <B>1</B> in toluene showed a rare phenomenon of fluorescence enhancement with increasing temperature via activating more vibrational bands that lead to stronger twisted intramolecular charge-transfer (TICT) emissions. Morphological-change-mediated fluorescence tuning has also been demonstrated by fabricating nanoparticles of <B>1</B>. The conversion of highly polydispersed, featureless, different-shaped nanoparticles into nearly uniformly sized spherical nanoparticles (20–25 nm) converts green (λ<SUB>max</SUB> = 502 nm) to blue fluorescence (λ<SUB>max</SUB> = 478 nm). The self-reversible multi-stimuli-responsive fluorescence switching and polymorphism and nanofabrication-mediated fluorescence tuning suggest its potential application in sensors, particularly for fluorescent thermometers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-17/acs.jpcc.5b00310/production/images/medium/jp-2015-00310a_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5b00310'>ACS Electronic Supporting Info</A></P>
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>
Intertemporal Opimization under Threat of VER
Hariharan, Govind,Wall, Howard J. 세종대학교 국제경제연구소 1992 Journal of Economic Integration Vol.7 No.1
The imposition of a commercial policy does not generally come as a complete surprise to the affected parties. Exporting firms have some information about the political climate in their export markets, and thus, can assess the probability of a trade restraint being imposed. In the case of aquantity restriction, it is likely that the volume of trade allowed after the restraint is positively related to the volume of trade before the restraint. Thus, firms have an incentive to increase current production so that the losses they would incur in the event of a restriction are decreased. Such an incentive is referred to in the literature as the 'Yano effect'. This paper used an imperfectly competitive model to develop a different and more direct channel for the Yano effect and to determine its impact on intertemporal welfare.
Shape optimization of NACA0012 using Computational Fluid Dynamics and Response Surface Methodology
Hariharan Kallath,Jun Seok Lee(이준석),June Kee Min(민준기) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Airfoil shape optimization has been studied for a long time. The present study is related to the shape optimization of NACA 0012 airfoil profile using computational fluid dynamics and response surface methodology tools at Reynolds number 2 million, Mach number 0.15 and 10 deg angle of attack. The shape of the airfoil is parameterized differently, and a set of numerical simulations were carried out for all combinations of the parameters. The need for remeshing during CFD analysis is successfully bypassed using mesh morphing methods. Response surfaces are fitted to the drag and lift coefficient outcomes from the simulations based on several statistical criteria. Three optimization problems were formulated, and the shape of airfoil was optimized for each optimization problem. The optimized shape is compared and reported concerning the baseline shape.