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Design feasibility of gamma camera without collimator based on specific arrangement of the detectors

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Nuclear Science and Techniques 2016年第4期27卷 120-126页

作者： hossein akbari-Lalimi Seyed Ali Shafiei Geriatric Care Research Center Rafsanjan University of Medical Sciences Department of Medical Physics Mashhad University of Medical Sciences Department of Physiology and Pharmacology School of Medicine Qom University of Medical Sciences

In gamma camera and single-photon emission computerized tomography, the collimator removes most photons. Here, a gamma camera without collimator utilizes a specific arrangement of detectors. Instead of bending beams(like a lens) or directing beams(by parallel hole collimator), changes are created in detectors' field of view(FOV), so that each detector's FOV looks different from others. Simulation proved this theory, with 98 detectors(2 cm 9 1.41 cm) arranged in a zigzag manner for Monte Carlo simulation. A radioactive source with energy of140 ke V was situated on the detectors' faces. Sixty projections, each 3(0 –179) apart, were simulated by Monte Carlo N-Particle(MCNP) 4C code, rotating detectors around a radioactive point. The band containing the radioactive source is clearly visible in each *** obtained after simulation in different projections were reconstructed, and point source location emerged correctly. Simulation of gamma camera with zigzag arrangement of detectors and MCNP-4C code demonstrated that one could string the space and determine radioactive source by image reconstruction without using collimators, solely through these special detectors' distribution.

关键词：探测器准直器 γ相机蒙特卡洛模拟计算机断层扫描单光子发射设计布置

Analysis of dynamic wave model for flood routing in natural rivers

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Water Science and Engineering 2012年第3期5卷 243-258页

作者： Reza BARATI Sajjad RAHIMI Gholam hossein akbari Faculty of Civil and Environmental Engineering Tarbiat Modares University Social Development and Health Promotion Research Center Kermanshah University of Medical Sciences Department of Civil Engineering University of Sistan and Baluchestan

Flooding is a common natural disaster that causes enormous economic, social, and human losses. Of various flood routing methods, the dynamic wave model is one of the best approaches for the prediction of the characteristics of floods during their propagations in natural rivers because all of the terms of the momentum equation are considered in the model. However, no significant research has been conducted on how the model sensitivity affects the accuracy of the downstream hydrograph. In this study, a comprehensive analysis of the input parameters 9f the dynamic wave model was performed through field applications in natural rivers and routing experiments in artificial channels using the graphical multi-parametric sensitivity analysis （GMPSA）. The results indicate that the effects of input parameter errors on the output results are more significant in special situations, such as lower values of Manning＇s roughness coefficient and/or a steeper bed slope on the characteristics of a design hydrograph, larger values of the skewness factor and/or time to peak on the channel characteristics, larger values of Manning＇s roughness coefficient and/or the bed slope on the space step, and lower values of Manning＇s roughness coefficient and/or a steeper bed slope on the time step and weighting factor.

关键词： open channel ,flow," flood wave," dynamic wave model flood routing numericalexperiments," sensitivity analysis

Epidemiological, molecular characterization and risk factors of human brucellosis in Iran

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Asian Pacific Journal of Tropical Medicine 2020年第4期13卷 169-175页

作者： Afshar Etemadi Rezvan Moniri Mahmood Saffari hossein akbari Saeed Alamian Ali MohammadBehrozikhah Department of Microbiology Faculty of MedicineKashan University of Medical SciencesKashanIran Department of Biostatistics and Public Health Faculty of HealthKashan University of Medical SciencesKashanIranSocial Determinants of Health(SDH)Research CenterKashanIran Brucellosis Department Razi Vaccine and Serum Research InstituteAgricultural ResearchEducation and Extension Organization(AREEO)KarajIran

Objective:To determine epidemiological,molecular characterization,and potential risk factors of human ***:This descriptive study was carried out in the clinical setting in Iran between 2017 and 2018.A total of 297 participants enrolled in the *** sample size was calculated based on the occurrence rate of brucellosis in different *** were assessed using serological tests and conventional culture *** and multiplex PCR methods typed all of Brucella *** risk factors of disease were ***:A total of 141 of 297(47.5%)Brucella strains were isolated and all of them were detected as Brucella melitensis biovar *** on serologic titers,high culture positivity was recorded at 1/640 titer(P<0.006).The risk factors for brucellosis were patients older than 40 years(OR=2.23,95%CI:1.4-3.55,P=0.001),animal keeper(OR=7,95%CI:1.51-32.41,P=0.005),housewife(OR=8.76,95%CI:1.85-41.37,P=0.002),farmer(OR=6.42,95%CI:1.21-33.97,P=0.019),and contact with animal(OR=1.31,95%CI:0.60-2.85,P=0.005).Conclusions:To the best of our knowledge,this is the first comprehensive report from Iran presenting the detection of Brucella species by the multiplex *** melitensis biovar 1 is still the dominant causative agent in *** consumption of unpasteurized dairy products,living in rural areas,and animal contact were risk factors of brucellosis.

关键词： Brucellosis Epidemiology Molecular detection Risk factors

Thermodynamic Stability, Half-Metallic and Optical Properties of Sc_(2)CoSi [001] Film:a DFT Study

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Communications in Theoretical Physics 2019年第4期71卷 455-462页

作者： Maliheh Amiri hossein akbari Bashir Nedaee-shakarab Arash Boochani Amin Aminian Yousof Zangeneh Sirvan Naderi Department of Physics Kermanshah Branch Islamic Azad University Department of Physics Ardabil Branch Islamic Azad University Department of physics university of Guilan Young Researchers and Elite Club Kermanshah Branch Islamic Azad University

The electronic and optical characteristics of the Sc2 CoSi Heusler with L21 structure and also the surface effect on electronic and optical properties, and the ?lms thermodynamic stability of the [001] direction in four cases including:Sc-Sc, Sc-Co, Sc-Si and Co-Si terminations are studied using the ?rst principles calculations(FPLAPW) within the framework of the density functional theory(DFT). The band structure calculations represent the ferromagnetic halfmetallic properties with 100% spin polarization and 0.54 e V indirect gap in spin down for Sc2 CoSi bulk with optimized lattice parameters of 6.25 A?. The total magnetic moment obtained for this compound is-1.0 μB, which is in accordance with Slater-Pauling rule. The half-metallic(HM) behavior by 100% spin polarization at Fermi level is occurred in the Sc-Si termination with a 0.32 eV gap in down spin. The optical responses have been calculated for the bulk and ScSi termination by a red shift in these parameters and the metallic treatments have been increased. According to the thermodynamic phase diagrams, it is shown the Sc-Si and Sc-Sc terminations are more stable than other terminations.

关键词： half-metalicity DFT thermodynamic stability thin films Heusler alloy first-principles calculations

An analysis of association of personality traits with job burnout among nurses working in hospital

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Journal of Integrative Nursing 2023年第1期5卷 43-49页

作者： hossein akbari Masoud MOTALEBI KASHANI Sedighe DEHGHANI BIDGOLI Masoumeh Koochaki NASRABADI Fahimeh KARAMALI Trauma Research Center Kashan University of Medical SciencesKashanIran Social Determinants of Health Research Center Kashan University of Medical SciencesKashanIran Department of Occupational Health Kashan University of Medical SciencesKashanIran Department of English Literature Kashan universityKashanIran Department of Health Safety and Environmental ManagementSchool of HealthKashan University of Medical SciencesKashanIran

Objective:The objective of the present study is to explore the effects of personality traits on job burnout among hospital *** and Methods:This cross-sectional research was done during 2019-2020 at Kashan Shahid Beheshti *** data analysis procedures included descriptive statistics and the partial least squares-based structural equation *** participants were 150 nursing professionals.A questionnaire indicating information on demographics,burnout(measured using the Maslach Burnout Inventory with three dimensions of depersonalization,emotional exhaustion,and personal accomplishment),and personality profile(measured employing the neuroticism extraversion openness five-factor inventory including extroversion,conscientiousness,agreeableness,neuroticism,and openness to experience dimensions)was used to gather the required ***:The results of the study showed that the validity and reliability of the measurement model were desirable(factor load higher than 0.5,the Cronbach’s alpha value and the composite reliability are>0.7).Structural model showed statistically drastic,negative relationship between the nurses’burnout levels and neuroticism(β=0.722)and openness to experience(β=0.437).However,the relationship was significantly positive between the nurses’burnout levels and conscientiousness(β=0.672),agreement(β=0.594),and extraversion(β=0.559)(P<0.03).Conclusions:The present study helped the recognition of burnout among nurses working in hospitals and approved the effects of personality features on the burnout experience.

关键词： Hospital nursing job burnout nurses personality traits professional burnout

Cerebral state index versus Glasgow coma scale as a predictor for in-hospital mortality in brain-injured patients

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Chinese Journal of Traumatology 2014年第4期17卷 220-224页

作者： Mehrdad Mahdian Mohammad Reza Fazel Esmaeil Fakharian hossein akbari Soroush Mahdian Trauma Research Center Kashan University of Medical Sciences Kashan I.R.Iran Student Research Committee Arak University of Medical Sciences Arak I.R.Iran

Objective：To compare the value of Glasgow coma scale （GCS） and cerebral state index （CSI）on predicting hospital discharge status of acute braininjured ***：In 60 brain-injured patients who did not receive sedatives,GCS and CSI were measured daily during the first 10 days of *** outcome of prognostic cut-off points was calculated by GCS and CSI using receiver operating characteristic （ROC） curve regarding the time of admission and third day of ***,specificity and other predictive values for both indices were ***：Of the 60 assessed patients,14 patients had mild,13 patients had moderate and 33 patients had severe *** the course of the study,17 patients （28.3％） deteriorated in their situation and *** mean GCS and CSI in patients who deceased during hospitalization was significantly lower than those who were discharged from the ***＜4.5 and CSI＜64.5 at the time of admission was associated with higher mortality risk in traumatic brain injury patients and GCS was more sensitive than CSI to predict in-hospital death in these *** the first day of hospitalization,the area under ROC curve was 0.947 for GCS and 0.732 for ***：GCS score at ICU admission is a good predictor of in-hospital ***＜4.5 and CSI＜64.5 at the time of admission is associated with higher mortality risk in traumatic brain injury patients and GCS is more sensitive than CSI in predicting death in these patients.

关键词： Brain injuries Glasgow coma scale Outcome assessment

Comparison of the predictive value of the Helsinki,Rotterdam,and Stockholm CT scores in predicting 6-month outcomes in patients with blunt traumatic brain injuries

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Chinese Journal of Traumatology 2023年第6期26卷 357-362页

作者： Nushin Moussavi Biuki Hamid Reza Talari Mohammad hossein Tabatabaei Masoumeh Abedzadeh-Kalahroudi hossein akbari Mahsa Masjedi Esfahani Reihaneh Faghihi Department of Surgery Trauma Research CenterKashan University of Medical SciencesKashanIran Department of Radiology Kashan University of Medical SciencesKashanIran Trauma Research Center Kashan University of Medical SciencesKashanIran Department of Biostatistics Trauma Research CenterKashan University of Medical SciencesKashanIran

Purpose:Despite advances in modern medicine,traumatic brain injuries(TBIs)are still a major medical *** diagnosis of TBI is crucial for clinical decision-making and *** study aims to compare the predictive value of Helsinki,Rotterdam,and Stockholm CT scores in predicting the 6-month outcomes in blunt TBI ***:This cohort study was conducted on blunt TBI patients of 15 years or *** of them were admitted to the surgical emergency department of Shahid Beheshti Hospital in Kashan,Iran from 2020 to 2021 and had abnormal trauma-related findings on brain CT *** patients’demographic data such as age,gender,history of comorbid conditions,mechanism of trauma,Glasgow coma scale,CT images,length of hospital stay,and surgical procedures were *** Helsinki,Rotterdam,and Stockholm CT scores were simultaneously determined according to the existing *** included patients'6-month outcome was determined using the Glasgow outcome scale extended.M Data were analyzed by SPSS software version ***,specificity,negative/positive predictive value and the area under the receiver operating characteristic curve were calculated for each *** Kappa agreement coefficient and Kuder Richardson-20 were used to compare the scoring ***:Altogether 171 TBI patients met the inclusion and exclusion criteria,with the mean age of(44.9±20.2)*** patients were male(80.7%),had traffic related injuries(83.1%)and mild TBIs(64.3%).Patients with lower Glasgow coma scale had higher Helsinki,Rotterdam,and Stockholm CT scores and lower Glasgow outcome scale extended *** all the scoring systems,the Helsinki and Stockholm scores showed the highest agreement in predicting patients’outcomes(kappa=0.657,p<0.001).The Rotterdam scoring system had the highest sensitivity(90.1%)in predicting death of TBI patients,whereas the Helsinki scoring system had the highest sensitivity(89.8%)in predicting the 6-month outcome in TBI

关键词： Brain injuries,traumatic Traumatic Rotterdam CT scoring system Helsinki CT scoring system Stockholm CT scoring system CT scan Glasgow outcome scale extended

Road traffic deaths in Kashan region, Iran： An eight-year study （2006-2013）

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Chinese Journal of Traumatology 2018年第1期21卷 54-57页

作者： Mehrdad Mahdian Mojtaba Sehat Mohammad Reza Fazel hossein akbari Habibollah Rahimi Mahdi Mohammadzadeh Trauma Research Center. Kashan University of Medical Sciences Kashan Iran Department of Biostatistics and Epidemiology School of Health Kashan University of Medical Sciences Kashan Iran

Purpose： The aim of this study was to analyze the trend of road traffic fatalities in Kashan Region, lran, in a period of eight years. Methods： Through a cross-sectional study, all road traffic deaths classified under the VO1-V99 codes according to ICD-10 in Kashan region, central Iran, from March 2006 to March 2013 and population data were collected from the registration system of Kashan University of Medical Sciences. Years of lost life （YLL） and mortality rates were calculated regarding age, gender and year of the accident. Generalized linear model （GLM） with Poisson log-linear link was used to evaluate the effects of the mentioned variables on mortality rate. Results： During the period of the study （8 years）, 928 people （767 men） died due to road traffic injuries （RTIs）. The total YLL was 20,818. The mortality rate due to RTIs has been declined constantly from 43.1 in March 2006 to 21.1 per 100,000 in March 2013. The highest mortality rate was found in the age group of over 60 years old and the lowest in the age group of 0-14 years old. Both mortality rate and YLL was greater in men than in women. Poisson regression showed that age, gender and year of the accidents had a significant effect on mortality rate （p 〈 0.001 ）. Conclusion： Although there has been a constant decline of mortality rate in Kashan area within the study period, the value remains higher than the mean level of Eastern Mediterranean region and the global average, which is a notable fact for policymakers and authorities.

关键词： Premature Mortality Traffic accident Epidemiology Iran

An SDN-Based Algorithm for Caching,Routing,and Load Balancing in ICN

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China Communications 2024年第5期21卷 64-76页

作者： MohammadBagher Tavasoli hossein Saidi Ali Ghiasian Department of Electrical and Computer Engineering Isfahan University of TechnologyIsfahanIran Department of Technology and Engineering Shahrekord UniversityShahrekordIran

One of the challenges of Informationcentric Networking(ICN)is finding the optimal location for caching content and processing users’*** this paper,we address this challenge by leveraging Software-defined Networking(SDN)for efficient ICN *** achieve this,we formulate the problem as a mixed-integer nonlinear programming(MINLP)model,incorporating caching,routing,and load balancing *** explore two distinct scenarios to tackle the ***,we solve the problem in an offline mode using the GAMS environment,assuming a stable network state to demonstrate the superior performance of the cacheenabled network compared to non-cache ***,we investigate the problem in an online mode where the network state dynamically changes over *** the computational complexity associated with MINLP,we propose the software-defined caching,routing,and load balancing(SDCRL)algorithm as an efficient and scalable *** evaluation demonstrates that the SDCRL algorithm significantly reduces computational time while maintaining results that closely resemble those achieved by GAMS.

关键词： in-network caching information-centric network power efficiency routing software-defined networking