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Using Audiometric Data to Weigh and Prioritize Factors that Affect Workers’ Hearing Loss through Support Vector Machine (SVM) Algorithm

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Sound & Vibration 2020年第2期54卷 99-112页

作者： Hossein ElahiShirvan MohammadReza Ghotbi-Ravandi sajad zare Mostafa Ghazizadeh Ahsaee Student Research Committee Kerman University of Medical SciencesKermanIran Associate Professor Department of Occupational HealthSchool of Public HealthKerman University of Medical SciencesKermanIran Assistant Professor Department of Occupational HealthSchool of Public HealthKerman University of Medical SciencesKermanIran Assistant Professor Department of Computer EngineeringShahid Bahonar UniversityKermanIran

Workers’exposure to excessive noise is a big universal work-related *** of the major consequences of exposure to noise is permanent or transient hearing *** current study sought to utilize audiometric data to weigh and prioritize the factors affecting workers’hearing loss based using the Support Vector Machine(SVM)*** cross sectional-descriptive study was conducted in 2017 in a mining industry in southeast *** participating workers(n=150)were divided into three groups of 50 based on the sound pressure level to which they were exposed(two experimental groups and one control group).Audiometric tests were carried out for all members of each *** study generally entailed the following steps:(1)selecting predicting variables to weigh and prioritize factors affecting hearing loss;(2)conducting audiometric tests and assessing permanent hearing loss in each ear and then evaluating total hearing loss;(3)categorizing different types of hearing loss;(4)weighing and prioritizing factors that affect hearing loss based on the SVM algorithm;and(5)assessing the error rate and accuracy of the *** collected data were fed into SPSS 18,followed by conducting linear regression and paired samples *** was revealed that,in the first model(SPL85 dBA),the frequency of 4 KHz had the highest impact(with a weight of 22%),while the frequency of 250 Hz had the smallest influence(with a weight of 3%).The accuracy of this model was 100%*** the fourth model,the frequency of 4 KHz had the greatest effect(with a weight of 24%),while the

关键词： Noise modeling hearing loss data mining support vector machine algorithm

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Weighing and Prioritizing Noise Control Methods Using the Delphi Technique and the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) in an Iranian Tire Manufacturing Factory

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Sound & Vibration 2020年第3期54卷 201-213页

作者： Mohammad Reza Ghotbi-Ravandi Davoud Hassanvand sajad zare Milad Beytollahi Associate Professor Department of Occupational HealthSchool of Public HealthKerman University of Medical Sciences and Health ServicesKermanIran Master of Occupational Health Student Research CommitteeSchool of Public HealthKerman University of Medical Sciences and Health ServicesKermanIran Assistant Professor Department of Occupational HealthSchool of Public HealthKerman University of Medical Sciences and Health ServicesKermanIran Department of Industrial Engineering Faculty of EngineeringShahid Bahonar University of KermanKermanIran

Undoubtedly,noise has become a major hazardous issue in today’s industrial world,with a lot of people suffering from exposure to excessive noise in their work *** study was conducted to weigh and prioritize noise control methods in an Iranian tire manufacturing complex in *** Delphi method and the Technique for Order Preference by Similarity and an Ideal Solution(TOPSIS)were utilized for this *** cross-sectional,descriptive study was conducted in the baking hall of an Iranian tire manufacturing factory in *** weigh and prioritize noise control methods,Analytic Hierarchy Process(AHP)and TOPSIS were *** total,4 criteria and 8 alternatives were *** AHP and TOPSIS questionnaire was then designed to prioritize noise control methods in the light of the objectives,criteria,and ***,the collected data were fed into Expert Choise.V.11 and Excel and data analysis was carried out using *** results of data analysis indicated that the inconsistency rate in all the cases was smaller than 10%,hence the consistency of the responses was *** to the TOPSIS results and experts’opinions about the criteria,implementation and maintenance cost(with a weight of 0.481)and method effectiveness and efficiency(with a weight of 0.046)had the highest and lowest priority *** on the weights TOPSIS,the appropriate methods for controlling noise in tire manufacturing are designing and manufacturing silencer,requiring people in charge to quickly fix the leaks and change baking press washers on time.

关键词： Ranking noise control methods TOPSIS delphi technique

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The Acoustic Performance of 3D Printed Multiple Jet Nozzles with DifferentConfigurations

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Sound & Vibration 2020年第1期54卷 43-55页

作者： Ali Safari Variani Ali Dastamoz sajad zare Ahmad Nikpey Saeid Ahmadi Department of Occupational Health and Safety School of Public HealthQazvin University of Medical SciencesQazvinIran Department of Occupational Health and Safety School of Public HealthKerman University of Medical SciencesKermanIran

This work investigated multiple jet nozzles with various geometrical shape,number of exits,and material on reducing noise radiated from jet *** are categorized in two groups with few and many exit numbers,each with various exit shapes,slot and circular,and ***,nozzles are designed and then fabricated by a 3D printer,Form Labs,Form2USA,with polymeric ***,the nozzle with the most noise reduction made of stainless *** and air thrust were measured at three air pressure gauges,3,5,7 BAR and directions from nozzle apex,30°,90°,135°.Nozzles with slot exit shape made of both plastic and stainless steel revealed the most noise reduction among all nozzles with few exit numbers,nearly 11–14 dB(A)and 11.5–15 dB(A),*** average,slotted nozzle noise reduction was nearly 5–6 dB(A)more than finned ***,nozzles with more exit numbers,finned and finned-central exit,illustrated much more noise reduction than nozzles with few exit numbers,by almost 16–18 dB(A),they represented similar *** tested nozzles and open pipe demonstrated equal air thrust at each pressure *** nozzles with slotted exit shape,either plastic or stainless steel,can provide reasonable noise reduction in comparison to other configuration with few exit *** contrast,nozzles with more exit numbers demonstrated the most noise reduction.

关键词： Jet noise multiple jet nozzle noise reduction 3D design exit shape nozzle geometry

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Reducing Occupational Noise Propagated from Centrifugal Fan through Dissipative Silencers:A Field Study

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Sound & Vibration 2021年第1期55卷 31-41页

作者： Ali Safari Variani Masoumeh Ghorbanide sajad zare Saeid Ahmadi Zahra Hashemi Department of Occupational Health and Safety School of Public HealthQazvin University of Medical SciencesQazvinIran Department of Occupational Health and Safety School of Public HealthKerman University of Medical SciencesKermanIran Department of Occupational Health Engineering Behbahan Faculty of Medical SciencesBehbahanIran

Acoustic performance of dissipative silencer was evaluated to determine the effectiveness of perforated duct porosity and absorbent material density in reducing occupational noise exposure propagated from centrifugal *** charts were applied to predict noise reduction and length of a dissipative *** silencers with various punched duct porosity(14%,30%and 40%)and sound absorbent density(80 Kg/m^(3),120 Kg/m^(3),and 140 Kg/m^(3))were designed and *** to ISO9612 and ISO11820,noise level was measured before and after installing all nine test silencers at fixed workstations around the discharge side of a centrifugal fan in a manufacturing *** average,the noise level at the discharge side of a fan without silencer was measured to be 93.6 dBA,whereas it was significantly mitigated by 67.4 dBA to 70.1 dBA after installing all *** insertion loss for a dissipative silencer with 100 cm length was predicted to be 27.9 dB,which was in agreement with experimental ***,there was no significant differences between insertion loss of silencers,the one with 30%porosity and 120 Kg/m^(3)rock wool density had the highest insertion loss of 26.2 *** silencers noticeably reduced centrifugal fan noise *** sound absorbent density and duct porosity up to a certain limit could probably be effective in noise reduction of dissipative silencers.

关键词： Absorbent density dissipative silencer fan noise porosity

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Evaluation of Individual and Environmental Sound Pressure Level and Drawing Noise-Isosonic Maps Using Surfer V.14 and Noise at Work V.5.0

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Sound & Vibration 2021年第2期55卷 163-171页

作者： sajad zare Rasoul Hemmatjo Hossein ElahiShirvan Ashkan Jafari Malekabad Mansour Ziaei Farshad Nadri Department of Occupational Health School of Public HealthKerman University of Medical SciencesKermanIran Department of Occupational Health School of Public HealthUrmia University of Medical SciencesUrmiaIra Student Research Committee Kerman University of Medical SciencesKermanIran Department of Occupational Health School of Public HealthBushehr University of Medical SciencesBushehrIran Department of Occupational Health School of Public HealthKermanshah University of Medical SciencesKermanshahIran

Noise pollution is one of the common physical harmful factors in many work *** current study aimed to assess personal and environmental sound pressure level and project the sound-Isosonic map in one of the Razavi Khorasan Paste manufacture using Surfer V.14 and Noise at work *** cross-sectional,descrip-tive study is analytical that was conducted in 2018 in the Paste factory that contains Canister,production and Brewing *** ISO 9612:2009,Casella Cel-320 was used to measure personal sound pressure level,while CEL-450 sound level meter(manufactured by Casella-Cel,the UK)was employed to assess environmental sound pressure *** analyzes was done using SPSS V.18 and Linear Regression *** sound-isosonic maps were projected using Surfer V.14 and Noise at work *** results of assessing personal sound pressure level indicated that the highest received dose(172.21%)and personal equivalent sound level(87.36 dBA)were recorded for workers in the Canister *** to results of measuring of the environmental sound pressure level,out of 16 measurement stations in this unit,overall 87.5%were regarded as danger and caution *** lowest and highest sound pressure levels in this units were 61 dBA and 92 dBA that belong to Brewing and Canister units *** indicate Over 75%of the Canister and production units had a sound pressure level greater than 85 dBA and these two units were regarded as the most dangerous area in terms of noise *** is there-fore necessary to implement noise control measures,apply hearing protection program and auditory tests among workers in these units.

关键词： Sound pressure level personal sound environmental sound sound map isosonic map surfer noise at work

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Presenting a Signal to Noise Ratio Model Based on the Combined Effect ofSound Pressure Level/frequency, Exposure Time and Oral Potassium:Experimental Study in Rats

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Sound & Vibration 2020年第1期54卷 17-25页

作者： Parvin Nassiri sajad zare Mohammad Reza Monazzam Akram Pourbakht Rasoul Hemmatjo Hossein ElahiShirvan Department of Occupational Health School of Public HealthTehran University of Medical SciencesTehranIran Student Research Committee Kerman University of Medical ScienceKermanIran Department of Audiology School of RehabilitationIran University of Medical SciencesTehranIran Department of Occupational Health School of Public HealthUrmia University of Medical SciencesUrmiaIran

Exposure to noise can lead to anatomical,nonauditory,and auditory *** auditory influence of noise exposure is manifested in the form of Noise-induced hearing loss(NIHL).The current study aimed at present a signal to noise ratio model of otoacoustic emission of rats’ears in the light of the combined effect of sound pressure level,sound frequency,exposure time,and potassium concentration of the used *** total,36 adult male rates,whose age varied from 3 to 4 months and had a weight of 200±50 g,were randomly divided into 12 groups,with each group consisting of 3 *** rats in both groups(case and control groups)were exposed to SPLs of 85,95,and 105 dB,emitted from sources that generated white noise.A distortion product otoacoustic emission(DPOAE)machine(4000 I/O manufactured by Homoth of Germany)was utilized to gauge the signal to noise ratio(SNR)of otoacoustic emissions of rats’ears at various frequencies in an acoustic *** inclusion criterion was SNR≥6 *** collected data were fed into the Statistical Package for Social Sciences(SPSS)version 18,followed by conducting descriptive and inferential data analysis *** results of SNR analysis indicated that over 82%of all data had SNRs that were equal to or greater than 6 *** data were considered as acceptable ***,SPL and sound frequency had significant associations with SNR(P<0.0001).Exposure time also significantly correlated with SNR(P=0.008).However,the potassium concentration of the used water had no significant correlation with SNR(P=0.97).High sound pressure levels result in lower ***,higher frequency leads to higher *** the contrary,longer exposure time reduces ***,the potassium concentration of the used water has no effect on SNR.

关键词： Noise sound pressure level potassium DPOAE rat

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Evaluation of Environmental Sound Pressure Level,Drawing of Noise-Isosonic Map Using Surfer V.19,and Prioritization of Engineering Noise Control Methods Using the Analytic Hierarchy Process(AHP):A Field Study in CGS Stations

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Sound & Vibration 2022年第3期56卷 275-291页

作者： sajad zare Abdolrasoul Rahmani Javad Korouzhdeh Masoud Hajghani Rouhollah Rostami Reza Esmaeili Department of Occupational Health Engineering and Safety at Work Faculty of Public HealthKerman University of Medical SciencesKerman***Iran Social Determinants of Health Research Center Institute for Futures Studies in HealthKerman University of Medical SciencesKerman***Iran Department of Occupational Health and Safety School of HealthLarestan University of Medical SciencesLarestan***Iran Student Research Committee Kerman University of Medical SciencesKerman***Iran Department of Industrial Engineering Shahid Bahonar University of KermanKerman***Iran Department of Occupational Health Engineering and Safety at Work Faculty of Public HealthUrmia University of Medical SciencesUrmia***Iran Department of Occupational Health Engineering School of HealthIsfahan University of Medical SciencesIsfahan***Iran

Noise pollution is one of the most significant harmful physical factors in the industrial and occupational *** to the high costs of exposure to excessive noise;continuous sound evaluation,propose and implement noise control plans in occupational environments is ***,the present study aimed to review environmental sound measurements,drawing of noise maps,and prioritizing the engineering noise control methods using the Analytic Hierarchy Process(AHP).This study was a descriptive-analytical study that aimed to assess occupational noises and present a control plan in the City Gas Stations(CGSs)of Kerman,Iran in *** present study was done in two *** the first phase,six CGSs were investigated to measure and evaluate the *** addition,the noise map of a CGS was drawn using the Surfer ***,the AHP was used in the second phase of the research to prioritize the control *** this phase,four criteria and ten alternatives were *** to first phase results,the sound pressure level(SPL)of the stations varied from 76 to 98 ***,the majority of the studied stations had a sound level higher than 85 dBA(danger zone).The second phase of the study showed that out of the four evaluated criteria,the executability criterion had the highest impact and the cost criterion had the lowest impact on the selection of control measures with a weight of 0.587 and 0.052,*** on the results of prioritization of the alternatives,using a silenced regulator(weight of 0.223)and increasing the thickness of the tube(weight of 0.023)had the highest and lowest priorities among the alternatives,*** use of engineering noise control methods such as using silenced regulators was the best way to control the noises of ***;it is noteworthy that AHP is a practical method for prioritizing alternatives to achieve the most accurate *** results of AHP can be of great help to health and s

关键词： Engineering noise control sound pressure level noise map analytic hierarchy process

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Studies on mass attenuation coefficients for some body tissues with different medical sources and their validation using Monte Carlo codes

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Nuclear Science and Techniques 2020年第12期31卷 50-64页

作者： Sepideh Yazdani Darki sajad Keshavarz Department of Physics University of YazdYazdIran Department of Medical Radiation Engineering University of Science and Research Branch TehranTehranIran

The mass attenuation coefficients of the breasts,lungs,kidneys,pancreas,liver,eye lenses,thyroid,brain,ovary,heart,large intestines,blood,skin,spleen,muscle,and cortical bone were measured at different sources(i.e.,0.021,0.029,0.03,0.14,0.218,0.38,0.412,0.663,0.83,and 1.25 MeV)using various methods including the Monte Carlo N-particle transport code(MCNP),the geometry and tracking code(GEANT4),and theoretical approach described in this *** attenuation coefficients were also compared with the values from the national institute of standards and technology(NIST-XCOM).The values obtained were similar to those obtained using *** results show that the theoretical method is quite convenient in comparison with GEANT4 and MCNP in the calculation of the mass attenuation coefficients of the human body samples applied when compared with the NIST values and demonstrated an acceptable difference.

关键词： Mass attenuation coefficient MCNP Geant4 XCOM Human organs

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Parametric study of droplet size in an axisymmetric flow-focusing capillary device

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1016-1022页

作者： Mostafa Rahimi sajad Yazdanparast Pouya Rezai Department of Mechanical Engineering University of Mohaghegh ArdabiliArdabilIran Department of Mechanical Engineering York UniversityTorontoONCanada

A conventional technique for microfluidic droplet generation is Co-axial Flow Focusing(CFF)in which a contraction zone is placed downstream of the dispersed phase *** this contraction zone,the dispersed-phase(dphase)fluid is pinched off by continuous-phase(c-phase)fluid to generate *** the influence of multiple parameters such as the fluids velocities and viscosities,the interfacial tension,and nozzle and orifice diameters on the droplet size is of great importance for the design and application of CFF ***,development of more complete numerical models is *** this paper,we show our model is compatible with experimental data and then numerically investigate the effects of aforementioned parameters on the droplet generation in a CFF microfluidic *** results showed that the c-phase flow rate,viscosity and the interfacial tension had great impacts on the droplet *** effect of the nozzle diameter on the generated droplet size was small compared to that of the orifice in a CFF *** the simulation results,a correlation was also developed and suggested which predicts the droplet size with less than 15%error in a wide range of the introduced dimensionless parameters.

关键词： Co-axial Flow Focusing Microfluidics Droplet generation Numerical investigation

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Explosive synchronization:From synthetic to real-world networks

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Chinese Physics B 2022年第2期31卷 89-108页

作者： Atiyeh Bayani sajad Jafari Hamed Azarnoush Department of Biomedical Engineering Amirkabir University of TechnologyNo.350Hafez Ave.Valiasr SquareTehran 159163-4311Iran Health Technology Research Institute Amirkabir University of TechnologyNo.350Hafez Ave.Valiasr SquareTehran 159163-4311Iran

Synchronization is a widespread phenomenon in both synthetic and real-world *** collective behavior of simple and complex systems has been attracting much research during the last *** different routes to synchrony are defined in networks;first-order,characterized as explosive,and second-order,characterized as continuous *** pioneer researches explained that the transition type is a generic feature in the networks,recent studies proposed some frameworks in which different phase and even chaotic oscillators exhibit explosive *** relationship between the structural properties of the network and the dynamical features of the oscillators is mainly proclaimed because some of these frameworks show abrupt *** different theoretical analyses about the appearance of the firstorder transition,studies are limited to the mean-field theory,which cannot be generalized to all *** are different real-world and man-made networks whose properties can be characterized in terms of explosive synchronization,e.g.,the transition from unconsciousness to wakefulness in the brain and spontaneous synchronization of power-grid *** this review article,explosive synchronization is discussed from two main ***,pioneer articles are categorized from the dynamical-structural framework point of ***,articles that considered different oscillators in the explosive synchronization frameworks are *** this article,the main focus is on the explosive synchronization in networks with chaotic and neuronal ***,efforts have been made to consider the recent articles which proposed new frameworks of explosive synchronization.

关键词： synchronization explosive synchronization Kuramoto oscillator chaotic systems neuronal networks complex network

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