In this study, a two-state Markov switching count-data model is proposed as an alternative to zero-inflated models to account for the preponderance of zeros sometimes observed in transportation count data, such as the number of accidents occurring on a roadway segment over some period of time. For this accident-frequency case, zero-inflated models assume the existence of two states: one of the ...

<span id="docs-internal-guid-9754d3d8-7fff-a7d2-6605-1c8f8c5a707a"><span>The classification method in the spatial analysis modeling based on multi-criteria parameter is currently widely used to manage geographic information systems (GIS) software engineering. The accuracy of proposed model will play an essential role successful development GIS. This related nature GIS for mapping th...

BACKGROUND Pulmonary hypertension is a hallmark of high-altitude pulmonary edema and may contribute to its pathogenesis. When administered by inhalation, nitric oxide, an endothelium-derived relaxing factor, attenuates the pulmonary vasoconstriction produced by short-term hypoxia. METHODS We studied the effects of inhaled nitric oxide on pulmonary-artery pressure and arterial oxygenation in 1...

the nnw-trending dena fault, with 140 km length, cuts the major structures of zagros fold-thrust belt in borujen region. the fault has divided the region in two zones, in which different structural, andmorphological features as well assedimentation and seismtectonic characteristics have developed. this study presents a new interpretation for the kinematics of dena fault based on field evidence....

Background and aims: This study aimed to investigate the deaths and injuries following pedestrian traffic accidents and factors associated with death of pedestrian in Tehran and Alborz provinces. Methods: In this cross-sectional study all traffic accidents related to pedestrians in Tehran and Alborz provinces reported from March 21, 2013 to March 21, 2014...

conclusion the chances of sustaining serious spine and associated multiple injuries in car accidents are quite high in iran. this may be due to the low level of standards or car manufacturing, absence, or inadequacy of appropriate safety measures in cars, poorly designed roads, and problems in the quality of driving to mention just a few reasons. therefore, these victims are prone to significan...

Urban road traffic safety has always been vital in transportation research. This paper analyzed the factors influencing degree of accident casualties on Jinan Jingshi Road and its branch roads, taking them as study area for urban problems. Additionally, it used application Particle Swarm Optimization (PSO), a Support Vector Machine (SVM) model, recursive feature elimination (RFE) to rank contri...