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LiDAR-based estimation of bounding box coordinates using Gaussian process regression and particle swarm optimization

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Biomimetic Intelligence & Robotics 2024年第1期4卷 24-35页

作者： Vinodha k. E.S.Gopi Tushar Agnibhoj Department of Electronics and Communication Engineering National Institute of Technology TiruchirappalliTamil Nadu620015India

Camera-based object track.ng systems in a given closed environment lack.privacy and *** this study,light detection and ranging(LiDAR)was applied to track.objects similar to the camera track.ng in a closed environment,guaranteeing privacy and *** primary objective was to demonstrate the efficacy of the proposed technique through carefully designed experiments conducted using two *** Scenario I,the study illustrates the capability of the proposed technique to detect the locations of multiple objects positioned on a flat surface,achieved by analyzing LiDAR data collected from several locations within the closed *** II demonstrates the effectiveness of the proposed technique in detecting multiple objects using LiDAR data obtained from a single,fixed ***-time experiments are conducted with human subjects navigating predefined *** individuals move within an environment,while LiDAR,fixed at the center,dynamically track. and identifies their locations at multiple *** demonstrate that a single,strategically positioned LiDAR can adeptly detect objects in motion around ***,this study provides a comparison of various regression techniques for predicting bounding box *** process regression(GPR),combined with particle swarm optimization(PSO)for prediction,achieves the lowest prediction mean square error of all the regression techniques examined at *** tuning of GPR using PSO significantly minimizes the regression *** of the experiment pave the way for its extension to various real-time applications such as crowd management in malls,surveillance systems,and various Internet of Things scenarios.

关键词： LiDAR Data acquisition Bounding box Gaussian process regression Particle swarm optimization(PSO)

A new route to weak.force sensing beyond SQL: Squeezed magnons in cavity magnomechanics

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： ?.k.?zdemir Department of Engineering Science and Mechanics and Materials Research Institute (MRI) The Pennsylvania State University University Park

Quantum mechanics imposes limits on measurement accuracy through quantum noise which typically has two components: First is the shot noise originating from vacuum fluctuations and referred to as the imprecision noise. Second is the quantum back.ction originating from the “action” of the measurement back.on the object being measured. The balance between the imprecision noise and the quantum back.ction(QBA) noise impose a standard quantum limit(SQL)on the quality of measurement [1].

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A cross-sectional study of breastfed infants referred for tongue tie assessment and frenotomy in one Canadian health region

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Pediatric Investigation 2024年第1期8卷 53-60页

作者： Tiffany A.Lee Jessica Bishop Anne Drover William k.Midodzi Laurie k.Twells School of Pharmacy Memorial University of Newfoundland(MUN)St.John’sCanada Faculty of Medicine Memorial University of Newfoundland(MUN)St.John’sCanada

Importance:Tongue tie(TT)is a condition that can cause infant feeding difficulties due to restricted tongue *** TT presents as a significant barrier to breastfeeding,a frenotomy may be *** accepted diagnostic criteria for TT are lack.ng and wide prevalence estimates are *** referral processes and a Frenotomy Assessment Tool were implemented in one Canadian health region to connect breastfeeding dyads with a provider for TT evaluation and ***:To determine the proportion of babies with TT as well as the frequency of ***:This cross-sectional study included infants who initiated breastfeeding at birth and were referred for TT evaluation over a 14-month *** were collected retrospectively by chart review and analyzed using *** associated with frenotomy were examined using logistic ***:Two hundred and forty-one babies were ***-two percent(n=222)were diagnosed with TT and 66.0%(n=159)underwent *** the multivariate model,nipple pain/trauma,inability to latch,inability to elevate tongue,and dimpling of tongue on extension were associated with frenotomy(P<0.05).Most referrals in our region resulted in a diagnosis of TT;however,the number of referrals was lower than expected,and of these two-thirds underwent ***:TT is a relatively common finding among breastfed *** research should examine whether a simplified assessment tool containing the four items associated with frenotomy in our multivariate model can identify breastfed infants with TT who require frenotomy.

关键词： Breastfeeding Nutrition Community health services Pediatrics

Sparse identification-assisted exploration of the atomic-scale deformation mechanism in multiphase CoCrFeNi high-entropy alloys

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Science China(Technological Sciences) 2024年第4期67卷 1124-1132页

作者： XIAO Lu GUO XiaoXiang SUN YuTong WANG Gang LONG WeiMin LIAW Peter k. REN JingLi School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China Institute of Materials Shanghai UniversityShanghai 200444China Sk. of Advanced Brazing Metals&Technology Zhengzhou Research Institute of Mechanical EngineeringZhengzhou 450001China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996USA

This study investigated the atomic-scale deformation mechanism of multiphase CoCrFeNi high-entropy alloys(HEAs)at liquid helium,liquid nitrogen,and room temperatures.A million-atom multiphase HEA was prepared using molecular dynamics simulation involving melt and quench *** HEA exhibited high-density dislocations and some twins,consistent with experimental *** analysis revealed an inconsistent evolution of the microstructure under tensile *** particular,the elastic and initial plastic stages exhibited an increase in the disordered structure at the expense of the face-centered cubic and hexagonal close-pack.d structures,followed by a subsequent transformation involving multiple structural ***,through sparse identification,a model depicting microstructural evolution during tension was extracted for the CoCrFeNi HEA at three typical temperatures and three tensile *** model highlighted the importance of the body-centered cubic structure in the evolutionary process.

关键词： high-entropy alloy data-driven method microstructure evolution multiphase structure molecular dynamics simulation

The diagnostic conundrum in necrotizing otitis externa

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World Journal of Otorhinolaryngology-Head and Neck.Surgery 2024年第1期10卷 59-65页

作者： Abiya A.Ahmed Shaan Rashid Vinay k.Gupta Neil C.Molony k.shav k.Gupta Bradford Royal Infirmary Bradford Teaching Hospitals NHS Foundation TrustWest BromwichWest YorkshireUK Sandwell and West Birmingham Hospitals NHS Trust West BromwichUK Russells Hall Hospital DudleyUK

Necrotizing otitis externa(NOE)is an aggressive and fast‐evolving infection of the external auditory *** diagnoses and untreated cases can lead to severe,even fatal consequences and so early diagnosis and treatment are *** is a notoriously challenging diagnosis to *** is therefore important to understand what diagnostic modalities are available and how otolaryngologists can use them to accurately treat such an aggressive *** review aims to evaluate the different diagnostic options available in NOE and discuss their advantages and limitations,thus,providing an up‐to‐date picture of the multimodal approach required in the diagnosis of this disease.

关键词： diagnostic malignant otitis externa necrotizing osteomyelitis sk.ll base osteomyelitis temporal bone osteomyelitis

Direct scaling of residual displacements for bilinear and pinching oscillators

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Earthquak. Engineering and Engineering Vibration 2024年第1期23卷 129-149页

作者： Mohammad Saifullah Vinay k.Gupta Department of Civil Engineering Indian Institute of Technology KanpurKanpur 208016India

The estimation of residual displacements in a structure due to an anticipated earthquak. event has increasingly become an important component of performance-based earthquak. engineering because controlling these displacements plays an important role in ensuring cost-feasible or cost-effective repairs in a damaged structure after the *** attempt is made in this study to obtain statistical estimates of constant-ductility residual displacement spectra for bilinear and pinching oscillators with 5%initial damping,directly in terms of easily available seismological,site,and model *** of the available models for the bilinear and pinching oscillators are useful when design spectra for a seismic hazard at a site are not *** statistical estimates of a residual displacement spectrum are proposed in terms of earthquak. magnitude,epicentral distance,site geology parameter,and three model parameters for a given set of ductility demand and a hysteretic energy capacity coefficient in the case of bilinear and pinching models,as well as for a given set of pinching parameters for displacement and strength at the break.oint in the case of pinching model *** proposed scaling model is applicable to horizontal ground motions in the western *** earthquak. magnitudes less than 7 or epicentral distances greater than 20 k..

关键词： residual displacement spectrum bilinear hysteresis model pinching hysteresis model nonlinear analysis scaling model

Analysis of the Oscillatory Flows of Multiple Shock.Waves in a Constant Area Duct

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Journal of Thermal Science 2024年第3期33卷 794-806页

作者： k.JAMES Jintu k.M Heuy Dong Department of Mechanical Engineering Andong National UniversityAndong36729Republic of Korea CAD-IT k.rea Co. Ltd.Seoul08591Republic of Korea

The oscillatory response of multiple shock.waves to downstream perturbations in a supersonic flow is studied numerically in a rectangular *** shock.waves are formed inside the duct at a shock.Mach number of *** duct has an exit height of H,and the effect of duct resonance on multiple shock.oscillations is investigated by attaching exit ducts of lengths 0H,50H,and *** downstream disturbance frequency varied from 10 Hz to 200 Hz to explore the oscillation characteristics of the multiple shock.*** oscillatory response of shock.waves under self-excited and forced oscillation conditions are analyzed in terms of wall static pressure,shock.train leading-edge location,shock.train length,and the size of the separation *** extent of the initial shock.location increases with an increase in exit duct length for the self-excited oscillation *** analysis of the shock.train leading edge and the spectral analysis of wall static pressure variations are *** variation in the shock.train length is analyzed using the pressure ratio method for self-excited as well as forced *** RMS amplitude of the normalized shock.train length(ζ_(ST))increases with an increase in the exit duct length for the self-excited oscillation *** the downstream perturbation frequency is increased,ζ_(ST)is decreased for exit duct *** all exit duct designs and downstream forcing frequencies,the size of the separation bubble grows and shrink. during the shock.oscillations,demonstrating the dependence on duct resonance and forced oscillations.

关键词： shock.train downstream disturbance supersonic flow shock.wave boundary layer interaction duct resonance flow separation

Impact of Fin Arrangement on Heat Transfer and Melting Characteristics of Phase Change Material

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Journal of Thermal Science 2024年第2期33卷 435-456页

作者： Arun UNIYAL Yogesh k.PRAJAPATI Department of Mechanical Engineering National Institute of Technology UttarakhandSrinagar(Garhwal)246174India Department of Mechanical Engineering BIT SindriDhanbadJharkhand828123India

Present work.investigates the heat transfer and melting behaviour of phase change material(PCM) in six enclosures(enclosure-1 to 6) filled with paraffin *** enclosures are equipped with distinct arrangements of the fins while k.eping the fin's surface area equal in each *** analysis has been presented to recognize the suitable fin arrangements that facilitate improved heat transfer and melting rate of the *** wall of the enclosure is maintained isothermal for the temperature values 335 k.350 k.and 365 *** length of the enclosure including fins is ranging between 0 and *** have been illustrated through the estimation of important performance parameters such as energy absorbing capacity,melting rate,enhancement ratio,and Nusselt *** has been found that melting time(to melt 100% of the PCM) is 60.5%less in enclosure-2(with two fins of equal length) as compared to the enclosure-1,having no *** the fin surface area equal,if the longer fin is placed below the shorter fin(enclosure-3),melting time is further decreased by 14.1% as compared to ***,among all the configurations,enclosure-6 with wire-mesh fin structure exhibits minimum melting time which is 68.4% less as compared to the *** on the findings,it may be concluded that fins are the main driving agent in the enclosure to transfer the heat from heated wall to the *** design and positioning of the fins improve the heat transfer rate followed by melting of the PCM in the entire area of the *** of the favourable vortices and natural convection current in the enclosure accelerate the melting phenomenon and help to reduce charging time.

关键词： phase change material enclosure fin melting fraction energy storage heat transfer

Performance of Continuous Wavelet Transform over Fourier Transform in Features Resolutions

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International Journal of Geosciences 2024年第2期15卷 87-105页

作者： Michael k. Appiah Sylvester k. Danuor Alfred k. Bienibuor Department of Physics Kwame Nkrumah University of Science and Technology (KNUST) Kumasi Ghana Department of Chemical Sciences University of Energy and Natural Resources Sunyani Ghana

This study presents a comparative analysis of two image enhancement techniques, Continuous Wavelet Transform (CWT) and Fast Fourier Transform (FFT), in the context of improving the clarity of high-quality 3D seismic data obtained from the Tano Basin in West Africa, Ghana. The research focuses on a comparative analysis of image clarity in seismic attribute analysis to facilitate the identification of reservoir features within the subsurface structures. The findings of the study indicate that CWT has a significant advantage over FFT in terms of image quality and identifying subsurface structures. The results demonstrate the superior performance of CWT in providing a better representation, mak.ng it more effective for seismic attribute analysis. The study highlights the importance of choosing the appropriate image enhancement technique based on the specific application needs and the broader context of the study. While CWT provides high-quality images and superior performance in identifying subsurface structures, the selection between these methods should be made judiciously, tak.ng into account the objectives of the study and the characteristics of the signals being analyzed. The research provides valuable insights into the decision-mak.ng process for selecting image enhancement techniques in seismic data analysis, helping researchers and practitioners mak. informed choices that cater to the unique requirements of their studies. Ultimately, this study contributes to the advancement of the field of subsurface imaging and geological feature identification.

关键词： Continuous Wavelet Transform (CWT) Fast Fourier Transform (FFT) Reservoir Characterization Tano Basin Seismic Data Spectral Decomposition