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- 검색키워드
- 저자 : S. Mohan Kumar (검색결과 17 건)
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V. G. Sujadevi,Neethu Mohan,S. Sachin Kumar,S. Akshay,K. P. Soman 대한의용생체공학회 2019 Biomedical Engineering Letters (BMEL) Vol.9 No.4
Segmentation of fundamental heart sounds–S1 and S2 is important for automated monitoring of cardiac activity includingdiagnosis of the heart diseases. This pa-per proposes a novel hybrid method for S1 and S2 heart sound segmentation usinggroup sparsity denoising and variation mode decomposition (VMD) technique. In the proposed method, the measured phonocardiogram(PCG) signals are denoised using group sparsity algorithm by exploiting the group sparse (GS) property ofPCG signals. The denoised GS-PCG signals are then decomposed into subsequent modes with specifi c spectral characteristicsusing VMD algorithm. The appropriate mode for further processing is selected based on mode central frequencies and modeenergy. It is then followed by the extraction of Hilbert envelope (HEnv) and a thresholding on the selected mode to segmentS1 and S2 heart sounds. The performance advantage of the proposed method is verifi ed using PCG signals from benchmarkdatabases namely eGeneralMedical, Littmann, Washington, and Michigan. The proposed hybrid algorithm has achieved asensitivity of 100%, positive predictivity of 98%, accuracy of 98% and detection error rate of 1.5%. The promising resultsobtained suggest that proposed approach can be considered for automated heart sound segmentation.
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Mohan Kumar Kalaiah,Nikhitha B Theruvan,Kaushlendra Kumar,Jayashree S Bhat 대한청각학회 2017 Journal of Audiology & Otology Vol.21 No.1
Background and Objectives: The present study aimed to investigate the effect of active listening and listening effort on the contralateral suppression of transient evoked otoacoustic emissions (CSTEOAEs). Subjects and Methods: Twenty eight young adults participated in the study. Transient evoked otoacoustic emissions (TEOAEs) were recorded using ‘linear’ clicks at 60 dB peSPL, in three contralateral noise conditions. In condition 1, TEOAEs were obtained in the presence of white noise in the contralateral ear. While, in condition 2, speech was embedded into white noise at +3, -3, and -9 dB signal-tonoise ratio (SNR) and delivered to the contralateral ear. The SNR was varied to investigate the effect of listening effort on the CSTEOAE. In condition 3, speech was played backwards and embedded into white noise at -3 dB SNR. The conditions 1 and 3 served as passive listening condition and the condition 2 served as active listening condition. In active listening condition, the participants categorized the words in to two groups (e.g., animal and vehicle). Results: CSTEOAE was found to be largest in the presence of white noise, and the amount of CSTEOAE was not significantly different between active and passive listening conditions (condition 2 and 3). Listening effort had an effect on the CSTEOAE, the amount of suppression increased with listening effort, when SNR was decreased from +3 dB to -3 dB. However, when the SNR was further reduced to -9 dB, there was no further increase in the amount of CSTEOAE, instead there was a reduction in the amount of suppression. Conclusions: The findings of the present study show that listening effort might affect CSTEOAE.
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Comparative assessment of surface and ground water quality using geoinformatics
Giridhar, M.V.S.S.,Mohan, Shyama,Kumar, D. Ajay Techno-Press 2020 Advances in environmental research Vol.9 No.3
Water quality demonstrates physical, chemical and biological characteristics of water. The quality of surface and groundwater is currently an important concern with population growth and industrialization. Over exploitation of water resources due to demand is causing the deterioration of surface water and ground water. Periodic water quality testing must be carried out to protect our water resources. The present research analyses the spatial variation of surface water and groundwater in and around the lakes of Hyderabad. Twenty-Seven lakes and their neighboring bore water samples are obtained for water quality monitoring. Samples are evaluated for specific physico-chemical parameters such as pH, Total Dissolved Solids (TDS), Cl, SO<sub>4</sub>, Na, K, Ca, Mg, and Total Hardness (TH). The spatial variation of water quality parameters for the 27 lakes and groundwater were analysed. Correlation and multiple regression analysis were carried out to determine comparative study of lake and ground water. The study found that most of the lakes were polluted and this had an impact on surrounding ground water.
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Effect of Vowel Context on the Recognition of Initial Consonants in Kannada
Mohan Kumar Kalaiah,Jayashree S Bhat 대한청각학회 2017 Journal of Audiology & Otology Vol.21 No.3
Background and Objectives: The present study was carried out to investigate the effect ofvowel context on the recognition of Kannada consonants in quiet for young adults. Subjectsand Methods: A total of 17 young adults with normal hearing in both ears participatedin the study. The stimuli included consonant-vowel syllables, spoken by 12 native speakersof Kannada. Consonant recognition task was carried out as a closed-set (fourteen-alternativeforced-choice). Results: The present study showed an effect of vowel context on theperception of consonants. Maximum consonant recognition score was obtained in the /o/vowel context, followed by the /a/ and /u/ vowel contexts, and then the /e/ context. Poorestconsonant recognition score was obtained in the vowel context /i/. Conclusions: Vowel contexthas an effect on the recognition of Kannada consonants, and the vowel effect wasunique for Kannada consonants.
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Naresh Kumar, A.,Min, Booki,Venkata Mohan, S. Elsevier 2018 Bioresource Technology Vol.269 No.-
<P><B>Abstract</B></P> <P>The objective of the study was to evaluate the potential application of defatted algal biomass (DAB) residue as a resource for biobased product synthesis in the biorefinery framework. Acid-catalyzed pretreatment of DAB residue resulted in higher reducing sugars (RS) solubilization (0.26 g RS/g DAB) than corresponding base method (0.19 g RS/g DAB). Subsequently, resulting RS were acidogenically fermented for the production of Bio-H<SUB>2</SUB> and short chain carboxylic acids (SCA)/volatile fatty acids (VFA) at varying redox conditions (pH: 6, 7 and 10). Biosystem with pH-6 resulted in higher SCA (0.54 g SCA/g RS) and Bio-H<SUB>2</SUB> production (0.83 l) followed by pH-10 (0.43 g SCA/g RS, 0.71 l) and pH-7 (0.27 g SCA/g RS, 0.48 l). Higher SCA production in pH-6 system resulted in maximum acidification (23%). Algal biomass majorly derived from CO<SUB>2</SUB> and its residues after lipids extraction accounted as major feedstock for acidogenic product synthesis. Evaluation of these studies using DAB residues offers sustainability to algal refineries on its entirety use.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Acid catalyzed pretreatment of DAB residues resulted in higher sugar solubilization. </LI> <LI> Higher biohydrogen production was resulted with pH-6 operation. </LI> <LI> Biosystem redox condition showed influence on SCA production and distribution. </LI> <LI> Use of DAB as a resource renders the sustainability to current algal biorefineries. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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R. Pramod,S. Mohan Kumar,A. Rajesh Kannan,N. Siva Shanmugam,Reza Tangestani 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
Wire plus arc additive manufacturing (WAAM) technology is utilized to fabricate a 347 stainless steel (SS347) plate usingthe gas metal arc welding process. The tensile properties of the WAAM plate revealed enhanced strength in comparisonwith the wrought alloy SS347. The microhardness and the ferrite measurement along the building direction (BD) were inthe range of 265–226 HV0.5 and 2.2–5.1 FN (Ferrite number), respectively. The microstructural features were comprehensively examined using electron backscatter difraction (EBSD) analysis and the Inverse pole fgure (IPF) maps revealed astrong <001> texture along the BD. Also, well-aligned equiaxed and columnar dendrites with a lower fraction of niobiumcarbide (NbC) was noticed in the microstructures of the as-built WAAM plate. A three-dimensional fnite element modelwas developed to simulate the build-up of a WAAM plate. Goldak heat source is used to model heat fux in thermal analysis,and the temperature distributions were predicted. Further, residual stress and plastic strain distributions were examined atvarious stages of the WAAM process.
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B. Sivakumar,S. Gokul Raj,G. Ramesh Kumar,R. Mohan 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
Single crystals of lithium potassium phthalate (LiKP) were successfully grown from aqueous solution by solvent evaporation technique. The grown crystals were characterized by single crystal X-ray diffraction. The lithium potassium phthalate C16 H12 K Li3 O11 belongs to triclinic system with the following unit-cell dimensions at 298(2) K; a = 7.405(5) Å; b = 9.878(5) Å; c = 13.396(5) Å; α = 71.778(5)°; β = 87.300(5)°; γ = 85.405(5)°; having a space group P1. Mass spectrometric analysis provides the molecular weight of the compound and possible ways of fragmentations occurs in the compound. Thermal stability of the crystal was also studied by both simultaneous TGA/DTA analyses. The UV-Vis-NIR spectrum shows a good transparency in the whole of Visible and as well as in the near IR range. Third order nonlinear optical studies have also been studied by Z-scan technique. Nonlinear absorption and nonlinear refractive index were found out and the third order bulk susceptibility of compound was also estimated. The results have been discussed in detail.
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Ilanchezhiyan, P.,Mohan Kumar, G.,Xiao, Fu,Poongothai, S.,Madhan Kumar, A.,Siva, C.,Yuldashev, Sh.U.,Lee, D.J.,Kwon, Y.H.,Kang, T.W. Elsevier 2017 Ultrasonics sonochemistry Vol.39 No.-
<P><B>Abstract</B></P> <P>Colloidal zinc telluride (ZnTe) nanostructures were successfully processed through a simple and facile ultrasonic (sonochemical) treatment for photoelectronic applications. The particle-like morphological features, phase and nature of valence state of various metal ions existing in ZnTe were examined using electron and X-ray photoelectron spectroscopic tools. Raman spectroscopic measurements revealed the dominance of exciton-phonon coupling and occurrence of TeO<SUB>2</SUB> traces in ZnTe through the corresponding vibrations. Optical bandgap of the ZnTe suspension was estimated to be around 2.15eV, authenticating the direct allowed transitions. The <I>p</I>-type electrical conductivity and charge carrier density of ZnTe were additionally estimated from the Bode, Nyquist and Mott-Schottky type impedance plots. The photoelectrical properties of ZnTe were investigated by fabricating <I>p</I>-ZnTe/<I>n</I>-Si heterostructures and studying their corresponding current-voltage characteristics under dark and white light illumination. The diodes revealed excellent rectifying behaviour with significant increase in reverse current under illumination. The stability of the devices were also affirmed through the time-dependent photoresponse characteristics, which actually suggested the improved and effective separation of photo generated electron hole pairs across the integrated heterojunctions. The obtained results also augment the potential of sonochemically processed ZnTe for application in photo detection and sensor related functions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanostructured ZnTe were ultrasonically processed for photoelectronics. </LI> <LI> Raman, XPS and electron microscopic tools affirmed their physico-chemical traits. </LI> <LI> Electrical properties were studied using Nyquist and Mott-Schottky plots. </LI> <LI> <I>I</I>-<I>V</I> studies augment the improved photo response in p-ZnTe/n-Si heterojunctions. </LI> </UL> </P>
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