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Accounting for Heterogeneity in Stop Frequency Models of Work Tours Using Latent Class Poisson Models

Journal of Transportation Technologies 2023年第2期13卷 243-261页

作者： babak Mirzazadeh KLD Engineering P.C. Islandia NY USA

Stop frequency models, as one of the elements of activity based models, represent an important part of travel behavior. Unobserved heterogeneity across the travelers should be taken into consideration to prevent biasedness and inconsistency in the estimated parameters in the stop frequency models. Additionally, previous studies on the stop frequency have mostly been done in larger metropolitan areas and less attention has been paid to the areas with less population. This study addresses these gaps by using 2012 travel data from a medium sized U.S. urban area using the work tour for the case study. Stop in the work tour were classified into three groups of outbound leg, work based subtour, and inbound leg of the commutes. Latent Class Poisson Regression Models were used to analyze the data. The results indicate the presence of heterogeneity across the commuters. Using latent class models significantly improves the predictive power of the models compared to regular one class Poisson regression models. In contrast to one class Poisson models, gender becomes insignificant in predicting the number of tours when unobserved heterogeneity is accounted for. The commuters are associated with increased stops on their work based subtour when the employment density of service-related occupations increases in their work zone, but employment density of retail employment does not significantly contribute to the stop making likelihood of the commuters. Additionally, an increase in the number of work tours was associated with fewer stops on the inbound leg of the commute. The results of this study suggest the consideration of unobserved heterogeneity in the stop frequency models and help transportation agencies and policy makers make better inferences from such models.

关键词： Activity Based Model Work Tour Stop Frequency Latent Class Poisson Regression Model

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Potentially Toxic Element Concentration in Fruits Collected from Markazi Province(Iran): A Probabilistic Health Risk Assessment

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Biomedical and Environmental Sciences 2019年第11期32卷 839-853页

作者： Mohammad Rezaei Bahareh Ghasemidehkordi babak Peykarestan Nabi Shariatifar Maryam Jafari Yadolah Fakhri Maryam Jabbari Amin Mousavi Khaneghah Department of Food Hygiene Faculty of Veterinary MedicineUniversity of TehranTehranIran Department of Food Safety and Hygiene School of Public HealthTehran University of Medical SciencesTehranTran Department of Biochemistry Payame Noor UniversityIsfahanIran Department of Agriculture Payame Noor UniversityTehranTran Department of Environmental Health Engineering School of Public Health and SafetyStudent Research CommitteeShahid Beheshti University of Medical SciencesTehranTran Department of Public Health School of Paramedical and HealthZanjan University of Medical SciencesZanjaniran Department of Food Science Faculty of Food EngineeringUniversity of Campinas(UNICAMP)Rua Monteiro Lobato80.Caixa Postal:6121.CEP:13083-862.Campinas.Sao Paulo.Brazil

Objective This study was conducted to evaluate the concentration of potentially toxic elements(PTEs)such as arsenic(As),cadmium(Cd),mercury(Hg),and lead(Pb)in fruit samples collected from Markazi Province,Iran.A probabilistic health risk assessment due to ingestion of PTEs through the consumption of these fruits was also *** The concentration of PTEs in 90 samples of five types of fruits(n=3)collected from six geographic regions in Markazi Province was *** potential health risk was evaluated using a Monte Carlo simulation *** A significant difference was observed in the concentration of PTEs between fruits as well as soil and water samples collected from different regions in Markazi *** order of PTE concentration in the soil and water samples was as follows:Pb>As>Hg>***,the highest level of transfer factor for Cd and Hg correlated with the *** estimated daily intake for adults and children was lower than the recommended tolerable daily *** The population in Markazi Province,Iran,is not at considerable noncarcinogenic or carcinogenic risk due to the ingestion of PTEs through the consumption of the examined fruits.

关键词： Fruits Soil Water Toxic elements Target Hazard Quotient(THQ) Estimated Hazard Index(HI)

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A new robust predictive model for lost circulation rate using convolutional neural network:A case study from Marun Oilfield

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Petroleum 2023年第3期9卷 468-485页

作者： Farshad Jafarizadeh babak Larki Bamdad Kazemi Mohammad Mehrad Sina Rashidi Jalil Ghavidel Neycharan Mehdi Gandomgoun Mohammad Hossein Gandomgoun Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Department of Petroleum Engineering Omidiyeh Branch of Islamic Azad UniversityOmidiyehIran Science and Research Branch Islamic Azad UniversityTehranIran Faculty of Mining Petroleum and Geophysics EngineeringShahrood University of TechnologyShahroodIran Department of Information Technology and Computer Engineering Shahid Madani University of AzerbaijanTabrizIran Faculty of Petroleum Engineering Sahand University of TechnologyTabrizIran

A major cause of some of serious issues encountered in a drilling project,including wellbore instability,formation damage,and drilling string stuck e which are known to increase non-productive time(NPT)and hence the drilling cost e is what we know as mud *** mud loss can be prevented or at least significantly reduced by taking proper measures beforehand provided the position and intensity of such loss can be properly predicted using an accurate predictor ***,in this study,we used the convolutional neural network(CNN)and hybridized forms of multilayer extreme learning machine(MELM)and least square support vector machine(LSSVM)with the Cuckoo optimization algorithm(COA),particle swarm optimization(PSO),and genetic algorithm(GA)for modeling the mud loss rate based on drilling data,mud properties,and geological information of 305 drilling wells penetrating the Marun *** this purpose,we began by a pre-processing step to attenuate the effect of noise using the Savitzky-Golay *** whole set of available data was divided into the modeling(including 2300 data points)and the validation(including 483 data points)***,the second generation of the non-dominated sorting genetic algorithm(NSGA-Ⅱ)was applied to the modeling data to identify the most significant features for estimating the mud *** results showed that the prediction accuracy increased with the number of selected features,but the increase became negligible when the number of selected features exceeded ***,the following 9 features were selected as input to the intelligent algorithms(IAs):pump pressure,mud weight,fracture pressure,pore pressure,depth,gel 10 min/gel 10 s,fan 600/fan 300,flowrate,and formation *** of the hybrid algorithms and simple forms of LSSVM and CNN to the training data(80%of the modeling data,i.e.1840 data points)showed that all of the models tend to underestimate the mud loss at higher mud loss rates,although the CNN exhibited l

关键词： Lost circulation prediction Artificial intelligence Deep learning Feature selection

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Electrodeposition and corrosion behavior of Zn-Ni-Mn alloy coatings deposited from alkaline solution

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Transactions of Nonferrous Metals Society of China 2020年第2期30卷 548-558页

作者： babak ABEDINI Naghi PARVINI AHMADI Sasan YAZDANI Luca MAGAGNIN Faculty of Materials Engineering Sahand University of TechnologyTabrizIran Dipartimento di Chimica Materiali e Ingegneria Chimica Giulio NattaPolitecnico di MilanoVia Mancinelli 720131MilanoItaly

The potentiostatic electrodeposition of Zn-Ni-Mn was carried out in an alkaline solution with the addition of Mn *** effects of electrolyte Mn2+concentration and deposition potential on the surface morphology,phase structure and corrosion behavior of coatings were *** results of corrosion polarization showed that the presence of higher Mn content in Zn-Ni-Mn coatings could lead to the formation of a good passive layer with a 7-fold increase in Rp of coating and a significant decrease in the corrosion current density compared to those of Zn-Ni *** XRD and the XPS analyses from the surface of Zn-Ni-Mn after corrosion test showed that the passive layer was composed of zinc hydroxide chloride,zinc oxide,zinc hydroxide carbonate,and manganese oxides.

关键词： Zn-Ni-Mn electrodeposition alkaline bath phase structure corrosion resistance chemical composition

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Maternal milk ILCs and adaptive immune cells populate neonatal organs

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Cellular & Molecular Immunology 2020年第6期17卷 665-667页

作者： Jack C.Yu Hesam Khodadadi Évila da Silva Lopes Salles Fairouz Chibane Jatinder Bhatia babak Baban Children’s Hospital of Georgia and Medical College of Georgia Augusta UniversityAugustaGAUSA Department of Oral Biology and Diagnostic Sciences Dental College of GeorgiaAugusta UniversityAugustaGAUSA Department of Surgery Medical College of GeorgiaAugusta UniversityAugustaGAUSA Division of Neonatology Department of PediatricMedical College of GeorgiaAugusta UniversityAugustaGAUSA

How does the neonatal immune system decide which of the millions and millions of microbes it encounters during and soon after birth are commensal and which are pathological?This is not a trivial *** vigorous responses to commensal bacteria cause unnecessary collateral tissue damage and loss of the potentially beneficial microbial flora needed for host *** the other hand,insufficient immune defense against invading,harmful,microbes is also very problematic,if not lethal.1 While the mechanisms for self-tolerance have been the subject of extensive investigations since the mid-1950s,such is not the case for selective unresponsiveness to commensal microbial flora residing on the skin or the mucosa of the gastrointestinal track.

关键词： neonatal organs immune

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Discrete fractional watermark technique

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Frontiers of Information Technology & Electronic Engineering 2020年第6期21卷 880-883页

作者： Zai-rong WANG babak SHIRI Dumitru BALEANU Data Recovery Key Laboratory of Sichuan Province School of Computer ScienceNeijiang Normal UniversityNeijiang 641100China Data Recovery Key Laboratory of Sichuan Province College of Mathematics and Information ScienceNeijiang Normal UniversityNeijiang 641100China Department of Mathematics Cankaya UniversityAnkara 06530Turkey Institute of Space Sciences Măgurele-Bucharest 011254Romania

The fractional logistic map holds rich dynamics and is adopted to generate chaotic series.A watermark image is then encrypted and inserted into the original *** the encryption image takes the fractional order within[0,1],it increases the key space and becomes difficult to *** study provides a robust watermark method in the protection of the copyright of hardware,images,and other electronic files.

关键词： Discrete fractional calculus Image encryption Watermark

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Case study scenarios in site selection of hazardous material facilities based on transportation preferences

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Journal of Modern Transportation 2019年第4期27卷 317-333页

作者： babak Mehran Musharraf Ahmad Khan Mina Mehran Hyukjae Roh Satish Sharma Department of Civil Engineering University of Manitoba66 Chancellors CirWinnipegMB R3T 2N2Canada Faculty of Engineering and Applied Science University of Regina3737 Wascana PkwyReginaSK S4S 0A2Canada City of Regina 2476 Victoria AvenueReginaSK S4P 3C8Canada

A methodology is proposed to evaluate and rank potential sites for facilities dealing with hazardous materials(HAZMAT).The proposed methodology incorporates HAZMAT route planning into facility siting while considering transportation preferences and *** area of interest is divided into smaller zones representing potential sites for a HAZMAT facility.A multimodal transportation network including railways and roads is considered for transportation of *** zone is evaluated based on its accessibility from a set of selected points of interests(POIs),which are defined as potential origin/destination points for transportation of *** shortest routes between each POI and potential zones are evaluated based on a cost function which can accommodate multiple criteria to determine the associated disutility for each potential ***,zones are ranked based on their cumulative disutility *** proposed analysis method is quantitative,and at the same time it is adequately flexible to allow inclusion of subjective *** of the proposed methodology is demonstrated for identifying optimal locations for a HAZMAT facility(e.g.,a nuclear facility)using the Canadian province of Saskatchewan as an *** scenarios were evaluated including(1)all network segments and POIs were treated equally,(2)network segments were rank ordered based on their functional classification while POIs were treated equally and(3)network segments were rank ordered based on their functional classification with preferences given to specific POI(s).

关键词： HAZMAT transportation Site selection Route planning Shortest path analysis

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Effect of addition of inulin and fenugreek on the survival of microencapsulated Enterococcus durans 39C in alginate-psyllium polymeric blends in simulated digestive system and yogurt

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Asian Journal of Pharmaceutical Sciences 2015年第4期10卷 350-361页

作者： babak Haghshenas Yousef Nami Minoo Haghshenas Abolfazl Barzegari Simin Sharifi Dayang Radiah Rozita Rosli Norhafizah Abdullah Institute of Biosciences University Putra Malaysia43400 UPM SerdangSelangorMalaysia School of Medicine Shahid Beheshti University of Medical SciencesTehranIslamic Republic of Iran Tabriz University of Medical Sciences Molecular Medicine and Therapy LabResearch Center for Pharmaceutical NanotechnologyTabrizIslamic Republic of Iran Chemical and Environmental Engineering Department Faculty of EngineeringUniversity Putra Malaysia43400 UPM SerdangSelangorMalaysia

The use of biopolymers for probiotic microencapsulation has been investigated in this *** objectives are to enhance its survival rate,colonic release,and stability of these probiotic cultures in digestive condition during storage *** types of biopolymers(alginate-psyllium)blend with different concentration of prebiotic;(inulin or fenugreek)were used as candidate for microencapsulation *** strain of probiotic candidates,namely;Enterococcus durans 39C was used in this *** microencapsulation of this strain with the respective polymer blend was performed by using a simple extrusion *** blend of formulations have recorded high encapsulation efficiency at value>98%.The survival rate of viable probiotic cells under simulated digestive conditions was also high with value above 47%as compared to non-microencapsulated *** nine gel formulations also displayed the high survival rate of viable probiotic cells during storage time(28 d).Their release occurred after 2 h in colonic condition and sustained until 12th h of incubation *** increase of prebiotic effect value added was observed in incorporated inulin and fenugreek *** short,this study revealed that a new herbal-based psyllium and fenugreek polymers have suitable potential as a matrix for probiotic microencapsulation.

关键词： Microencapsulation Psyllium Fenugreek Probiotic Enterococcus durans 39C

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COVID-19 and congenital heart disease:a case series of nine children

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World Journal of Pediatrics 2021年第1期17卷 71-78页

作者： Elmira Haji Esmaeil Memar babak Pourakbari Mojtaba Gorgi Meisam Sharifzadeh Ekbatani Amene Navaeian Mahmoud Khodabandeh Shima Mahmoudi Setareh Mamishi Pediatrics Center of Excellence Children's Medical CenterTehran University of Medical SciencesTehranIran Pediatric Infectious Disease Research Center Tehran University of Medical ScienceTehranIran Division of Pediatric Intensive Care Unit Pediatrics Center of ExcellenceChildren's Medical CenterTehran University of Medical SciencesTehranIran Department of Infectious Diseases Pediatrics Center of ExcellenceChildren's Medical CenterTehran University of Medical SciencesTehranIran

Background Coronavirus disease 2019(COVID-19)is the current pandemic disease without any vaccine or efficient treat-ment to rescue the *** diseases predispose the patients to a more severe disease and to a higher mortality ***,little evidence exists about COVID-19 outcomes in the pediatric population with congenital heart disease(CHD).Here,we report nine children with COVID-19 and concomitant *** Our study included nine children with COVID-19 and concomitant CHD who were admitted to Children Medical Center Hospital during March and April *** patients were classified based on the final outcome(death),and their clinical sign and symptoms,type of CHD,and drugs administered were *** Among the nine patients,two died and we compared different characteristics,laboratory results and clinical findings of these cases based on the *** deceased patients had severe types of CHD,worse arterial blood gases,severe clinical symptoms,higher mean level of partial thromboplastin time and C-reactive protein,and required more *** The present study showed that the general consideration of mild COVID-19 in children does not include patients with CHD and that it is necessary to pay greater attention to children with CHD to determine guidelines for treatment of COVID-19 in these *** to the scarcity of CHD and COVID-19,we reported only nine ***,further studies are highly required in this regard.

关键词： Congenital heart disease Coronavirus disease 2019 Pediatrics

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Investigation of the factors affecting the consistency of short-period traffic counts

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Journal of Modern Transportation 2017年第3期25卷 150-162页

作者： Solomon Yadessa Kenno Prasanta K.Sahu babak Mehran Satish Sharma Saskatchewan Ministry of Highways and Infrastructure Department of Civil Engineering Birla Institute of Technology and Science Pilani(BITS Pilani) Faculty of Engineering and Applied Science University of Regina

The main intent of this study is to investigate the accuracy of short-duration traffic counts conducted during winter months. The investigation is based on 11-year sample data collected using permanent traffic counters at various locations in Alberta, Canada. Four types of road sites： commuter, regional commuter, rural long-distance, and recreational sites are studied. The sample data consti- tute six different durations of counts （12-, 24-, 48-, 72-, 96-h, and 1 week） taken during summer and winter months. The coefficient of variation （CV） is used as the relative measure of deviation for counts of different dura- tions to measure the accuracy of short-period traffic counts. The study results indicate that 48-h count seems to be the most cost-effective counting interval during both summer and winter months. It is also found that the lowest values of CV result for counts taken at commuter sites, and the highest values are observed for recreational sites. Frequent changes in temperature and other weather events cause significant variation in traffic volume, which results in an increase in CV values for counts taken during winter months. The application of an adjustment factor to remove the effect of cold and snow from short-period counts is also included in this study. Introduced adjustment factors can reduce the values of CV for all counts taken during winter months. The findings of this study can lead highway agencies to improve the cost-effectiveness of their short- period traffic counting programs.

关键词： Short-period traffic counts Average annualdaily traffic - Design hourly volume

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