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Speech Separation Methodology for Hearing Aid

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Computer Systems Science & Engineering 2023年第2期44卷 1659-1678页

作者： joseph Sathiadhas Esra Y.Sukhi Meenakshi Sundararajan Engineering College ChennaiTamil naduIndia R.M.K.Engineering College KavaraipettaiTamil naduIndia

In the design of hearing aids(HA),the real-time speech-enhancement is *** digital hearing aids should provide high signal-to-noise ratio,gain improvement and should eliminate *** generic hearing aids the perfor-mance towards different frequencies varies and non *** noise can-cellation and speech separation methods drops the voice magnitude under the noise *** performance of the HA for frequency response is non *** noise suppression methods reduce the required signal strength ***,the performance of uniform sub band analysis is poor when hearing aid is *** this paper,a speech separation method using Non-negative Matrix Fac-torization(NMF)algorithm is proposed for wavelet *** Proposed non-uniformﬁlter-bank was validated by parameters like band power,Signal-to-noise ratio(SNR),Mean Square Error(MSE),Signal to Noise and Dis-tortion Ratio(SINAD),Spurious-free dynamic range(SFDR),error and *** speech recordings before and after separation was evaluated for quality using objective speech quality measures International Telecommunication Union-Telecommunication standard ITU-T P.862.

关键词： Speech separation waveletﬁlter independent component analysis(ICA) non-negative matrix factorization(NMF) fejer-korovkin(FK) signal-to-noise ratio(SNR)

Two roads diverge in the yellow pigments metabolic pathway for ABA synthesis

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Molecular Plant 2022年第1期15卷 3-5页

作者： Prateek Gupta Varda Mann joseph Hirschberg Department of Genetics Alexander Silberman Institute of Life SciencesThe Hebrew University of JerusalemJerusalem 9190401Israel

The phytohormone abscisic acid(ABA)is a 15-carbon molecule that fulfills essential functions in all *** regulates many as-pects of plant life,including growth and development,seed dormancy and germination,leaf senescence,and responses to various biotic and abiotic stresses(Finkelstein 2013).Due to the latter functions,ABA is also known as the"stress phytohormone."As in the case of other hormones,the level of ABA in the cells is critical for its precise regulatory functioning.

关键词： hormone metabolic yellow

Low-cost client-side encryption and secure Internet of things(IoT)provisioning

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Frontiers of Computer Science 2022年第6期16卷 199-201页

作者： joseph MAMVONG Gokop GOTENG Yue GAO School of Electronic Engineering&Computer Science Queen Mary University of LondonLondonE1 4NSUK Department of Electrical and Electronic Engineering University of SurreyGuildfordSurreyGU27XHUK

1 Introduction and main contributions Internet of things(loT)deployments hold the promise to revolutionize the technology landscape through the unprecedented connectivity of billions of devices,in many sectors including:transportation,businesses,healthcare,agriculture and homes to mention a ***[1],cloud computing is defined as a model for enabling ubiquitous,convenient,ondemand network access to a shared pool of configurable computing resources(e.g.,networks,servers,storage,applications,and services)that can berapidly provisioned and released with minimal management effort or service provider interaction.

关键词： client services IoT

NUMERICAL SIMULATION OF SKIMMING FLOW OVER MILD STEPPED CHANNEL

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Journal of Hydrodynamics 2006年第3期18卷 367-371页

作者： DONG Zhi-yong LEE joseph Hun-wei School of Civil and Architecture Engineering Zhejiang University of Technology Hangzhou 310014 China Department of Civil Engineering The University of Hong Kong Hong Kong China

Numerical simulation of stepped channel flow was conducted using turbulence models based on the VOF technique. Stepped channel flow is a complicated air-water two-phase flow with free surface, which can be divided into three flow regimes： skimming flow, nappe flow and transition flow. The characteristics of skimming flow over mild stepped channel was investigated, including friction factors, air concentration profiles velocity field, clear-water and bulked depths, static pressure, etc. Smooth channel flow was also simulated to compare the hydraulic characteristics of the stepped channel flow with the smooth one. Comparisons between the computed and the measured were made. Furthermore, comparison of the computed air concentration with Straub and Anderson＇s data was also performed. The Fluent 6.1 software was employed to conduct this numerical simulation work.

关键词： numerical simulation skimming flow stepped channel Volume Of Fluid (VOF) technique

Heat Transfer and Fluid Flow of Nanofluids in Laminar Radial Flow Cooling Systems

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Journal of Thermal Science 2005年第4期14卷 362-367页

作者： Gilles ROY Samy joseph PALM Cong Tam NGUYEN Faculty of Engineering Universite de MonctonMonctonNBCanadaElA 3E9

Nanofluids are considered as interesting alternatives to conventional coolants. It is well known that traditional fluids have limited heat transfer capabilities when compared to common metals. It is therefore quite conceivable that a small amount of extremely fine metallic particles placed in suspension in traditional fluids will considerably increase their heat transfer performances. A numerical investigation into the heat transfer enhancement capabilities of coolants with suspended metallic nanoparticles inside a radial, laminar flow cooling configuration is presented. Temperature dependant nanofluid properties are evaluated from experimental data available in recent literature. Results indicate that considerable heat transfer increases are possible with the use of relatively small volume fractions of nanoparticles. Generally, however, these are accompanied by considerable increases in wall shear-stress. Results also show that predictions obtained with temperature variable nanofluid properties yield greater heat transfer capabilities and lower wall shear stresses when compared to predictions using constant properties.

关键词： nanofluids nanoparticles heat transfer laminar flow confined radial flow.

Lead-phase and red-stripe color morphs of red-backed salamanders Plethodon cinereus differ in hematological stress indices:A consequence of differential predation pressure?

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Current Zoology 2010年第2期56卷 238-243页

作者： Andrew K.DAVIS joseph R.MILANOVICH D.B. Warnell School of Forestry and Natural Resources The University of Georgia

Throughout the animal kingdom there are species that have two or more phenotypic forms or ‘morphs＇, and many of these are amphibians. In North America, the red-backed salamander Plethodon cinereus can have either a red dorsal stripe or no dorsal stripe （lead-phase form）, and evidence to date indicates the lead-phase form incurs a greater number of attacks from predators. In a recent collection of 51 P cinereus, blood smears of both color morphs （35 red-stripe, 16 lead-phase） were examined to obtain numbers of circulating leukocytes （via light microscopy）, which can be used to indirectly estimate levels of stress hormones in vertebrates via a ‘hematological stress index＇, which is the ratio between the number of two leukocyte types （neutrophils and lymphocytes）. Our results showed that lead-phase salamanders tended to have greater numbers of circulating neutrophils and lower numbers of circulating lymphocytes than red-stripe morphs, leading to higher average neutrophil-lymphocyte ratios in lead-phase individuals. Since the salamanders were held （refrigerated） for 7 days before sampling, we cannot be certain if this effect is a stress reaction to the captivity or the normal level for this morph. However comparison with two sets of related salamanders that were captured and sampled immediately indicates the red-stripe salamanders were either not stressed from the captivity at all, or their white blood cell distributions had returned to normal after 7 days of captivity. Taken together, our results indicate that lead-phase forms of P. cinereus have higher stress levels than the red-stripe forms, which may be a consequence of their higher exposure to, and/or attacks from, predators. They may also indicate that the lead-phase form is less-suited to captivity than the red-stripe form of this species.

关键词： Red-backed salamander Plethodon cinereus Color polyrnorphism Hematological stress index Corticosterone

Effect of benzaldehyde on the electrodeposition and corrosion properties of Ni–W alloys

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International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1060-1066页

作者： U.Pramod Kumar C.joseph Kennady Department of Chemistry Karunya Institute of Technology and SciencesKarunya NagarCoimbatore 641114Tamil NaduIndia

The effect of different concentrations of benzaldehyde on the electrodeposition of Ni–W alloy coatings on a mild steel substrate from a citrate electrolyte was investigated in this study. The electrolytic alkaline bath(p H 8.0) contained stoichiometric amounts of nickel sulfate, sodium tungstate, and trisodium citrate as precursors. The corrosion resistance of the Ni–W-alloy-coated specimens in 0.2 mol/L H2SO4 was studied using various electrochemical techniques. Tafel polarization studies reveal that the alloy coatings obtained from the bath containing 50 ppm benzaldehyde exhibit a protection efficiency of 95.33%. The corrosion rate also decreases by 21.5 times compared with that of the blank. A higher charge-transfer resistance of 1159.40 ?·cm2 and a lower double-layer capacitance of 29.4 μF·cm-2 further confirm the better corrosion resistance of the alloy coating. X-ray diffraction studies reveal that the deposits on the mild steel surface are consisted of nanocrystals. A lower surface roughness value(Rmax) of the deposits is confirmed by atomic force microscopy.

关键词： nickel–tungsten alloys benzaldehyde electrodeposit

Cuttlebone： Characterisation, Application and Development of Biomimetic Materials

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Journal of Bionic Engineering 2012年第3期9卷 367-376页

作者： joseph Cadman Shiwei Zhou Yuhang Chen Qing Li School of Aerospace Mechanical and Meehatronic Engineering The University of Sydney NSW 2006 Australia Innovative Structures Group School of Civil Environmental and Chemical Engineering RMIT University GPO Box 2476 Melbourne 3001 Australia School of Engineering and Physical Sciences Heriot-Watt University Edinburgh EH14 4AS UK

Cuttlebone signifies a special class of ultra-lightweight cellular natural material possessing unique chemical, mechanical and structural properties, which have drawn considerable attention in the literature. The aim of this paper is to better understand the mechanical and biological roles of cuttlebone. First, the existing literature concerning the characterisation and potential applications inspired by this remarkable biomaterial is critiqued. Second, the finite element-based homogenisation method is used to verify that morphological variations within individual cuttlebone samples have minimal impact on the effective me- chanical properties. This finding agrees with existing literature, which suggests that cuttlebone strength is dictated by the cut- tlefish habitation depth. Subsequently, this homogenisation approach is further developed to characterise the effective me- chanical bulk modulus and biofluidic permeability that cuttlebone provides, thereby quanti lying its mechanical and transporting functionalities to inspire bionic design of structures and materials for more extensive applications. Finally, a brief rationale for the need to design a biomimetic material inspired by the cuttlebone microstructure is provided, based on the preceding inves- tigation.

关键词： cuttlebone characterisation biomimetic homogenisation

Nanoscopic imaging of oxidized graphene monolayer using tip-enhanced Raman scattering.

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Nano Research 2018年第12期11卷 6346-6359页

作者： joseph M.Smolsky Alexey V.Krasnoslobodtsev Department of Physics University of Nebraska at Omaha6001Dodge StreetOmaha NE 68182USA

Tip-enhanced Raman scattering (TERS) can be used for the structural and chemical characterization of materials with a nanoscale resolution, and offers numerous advantages compared to other forms of imaging. We use TERS to track the local structural features of a CVD-grown graphene monolayer. Ag nanoparticles were added to AFM probes using ion-beam sputtering in order to make them TERS-active. Such modification provides probes with large factors of enhancement and good reproducibility. TERS measurements on graphene show an emergence of a defect-induced D-Raman band and a strain-induced shoulder of the graphene’s G-band. Comparison of TERS results with micro-Raman for oxidized graphene suggests that local oxidation occurs with the introduction of sp3 defects, under TERS conditions.

关键词： graphene Raman spectroscopy tip-enhanced Raman scattering graphene oxidation