Urban travel time estimation is a strategically important task for many levels of traffic management and operation. Although number technologies regarding data model have been developed recently, it has not well solved yet given the following challenges: effective modeling approach, sparsity, condition fluctuation. In this paper, tensor-based spatial-temporal proposed citywide estimation, using big sparse GPS trajectories received from taxicabs. The different road segments under conditions...

Abstract C 29 H 32 BrO 2 P, monoclinic, P 1 / c (no. 14), a = 8.52420(10) Å, b 13.5027(5) 23.3580(4) β 95.359(1)°, V 2676.75(11) Å 3 , Z 4, R gt ( F ) 0.0386, w ref 0.1039, T 298(2) K.

An analytic high-frequency (HF) radar cross section model for ionosphere-ocean propagation is presented. Based on earlier work, an expression the first-order received electric field after a single scatter from each of ionosphere and sea surface derived reduced to integral form. The integrals are taken time domain, with source being that vertically polarized pulsed dipole antenna. Subsequently, mixed path mode ionospheric clutter developed. reflection coefficient used in analysis assumed be...

A theoretical model of the first-order high-frequency (HF) radar cross section (RCS) for ionosphere-ocean propagation involving a frequency-modulated continuous wave (FMCW) source is presented in this paper. Based on previous modeling scattering HF electromagnetic radiation from ocean surface, an expression electric field with FMCW derived mixed-path case which occurs both ionosphere and surface. Then, Fourier transformed frequency distribution demodulated indicates range information...

This paper proposes a method to estimate multimodal traffic volume on urban road networks using cellphone location data. The study considers the fact that there can be more than one phone user in each driving vehicle. Firstly, temporal and spatial is used distinguish whether signals are sent by cellphones running vehicles roads. Secondly, minimum spanning tree clustering proposed calculate number of commuters Based method, various travel modes, including drive alone, carpooling, bus,...

A theoretical second-order monostatic high-frequency radar power model is derived for the case of mixed-path ionosphere-ocean propagation. First, general form received electric field investigated by considering ionospheric reflection and sea scattering, which involves both electromagnetic hydrodynamic contributions. Then, this inversely Fourier transformed to time domain, a pulsed source incorporated. Subsequently, developed assuming that coefficient ocean surface can be described as series...

Aggressive driving is common across the world. While most aggressive conscious, some behavior may be unconscious on part of motor vehicle drivers. Perceptual bias one main causes traffic accidents. This paper focuses identifying impact factors related to perceptual bias. Questionnaire data from 690 drivers, collected a drivers’ retraining course administered by Traffic Management Bureau in Nanjing, China, were used collect socioeconomic characteristics, personality traits, and external...

An air quality monitoring network consisting of 53 stations at 9 cities over the Yangtze River Delta (YRD) simultaneously measured gaseous and particulate pollutants (SO2, NO2, CO, O3, PM2.5 PM10) during six-month Shanghai World Expo in 2010. The regional distribution showed that was a low-SO2-PM10 zone YRD Expo, owing to effective controls were applied power plants, industrial activities construction works. However, also became high-NOx-CO-O3 YRD, partly due large number vehicles Shanghai,...

To meet the growing demand of accurate and reliable travel time information in intelligent transportation systems, this a develops deep architecture incorporating contextual to estimate urban road network from citywide perspective. First, several categories features that affect significantly are analyzed extracted. On basis, architecture, which utilizes sparse denoising auto-encoders as building blocks, is proposed learn feature representations for estimation. train successfully, greedy...

The objective of this research is to develop a dynamic model predict bus dwell time at downstream stops. also intends test the proposed using real-world data. This based on k-Nearest Neighbour (KNN) algorithm history and current data collected by GPS (Global Positon System) fixed buses. In research, buses No.B1 line Changzhou in China used. with data, prediction performed effectively both accuracy calculating speed.

A theoretical mixed-path ionospheric clutter model for bistatic high frequency radar is presented. Based on previous monostatic work, the first-order received electric field derived by considering scattering processes both ionosphere and ocean surface. Then, power developed incorporating a vertically polarized pulsed dipole antenna. In order to investigate spectrum of this its relative intensity that clutter, normalized simulated. Numerical simulation results are compared with looking at...

A theoretical model of the high frequency (HF) radar ionospheric clutter for case vertical incidence is presented in this letter. Assuming a pulsed dipole source, equation received electric field after reflection by ionosphere first derived. Then relationship between coefficient and electron density incorporated into development power model. In order to investigate spectrum its relative intensity that first-order ocean clutter, normalized simulated. Simulation results show horizontal plasma...

The phenomenon that pedestrian violates traffic signals at intersections and crosses with danger is universal.This study aims to find out the influence of waiting time pedestrians an intersection three main factors violations.In this study, 13 1075 violations sample were collected in Suzhou China, which had different maximum times.The validation would use complementary video data.There are several factors, have great on proportion violations, such as age, sex, arrive time, red phase,...

Ionospheric clutter is one of the main sources interference affecting performance high frequency surface wave radar (HFSWR). One component this arises from a portion transmitted signal which reflected ionosphere to ocean surface, whence it backscattered receiving antennas. The influence ionospheric reflection can be accounted for by so-called coefficient (IRC). This paper presents three spectral models may used determine power within reasonable limitations.

High frequency surface wave radar (HFSWR) is becoming accepted as an important remote sensing device for sea state monitoring, and the frequency-modulated continuous (FMCW) has been widely used transmitted waveform. However, performance of HFSWR may be significantly impacted by unwanted echoes, which ionospheric clutter one main sources. During transmission, a portion radiation travel upwards to ionosphere from transmitting antenna. This partially reflected back receiving antennas directly...

The dynamic behavior of droplet impingement is one the most important processes spray cooling. Although refrigerants with a low boiling point have been widely used in cooling, their high volatility makes it difficult to generate stable under atmospheric pressure, and thus rarely reported. Therefore, great significance study refrigerant fill relevant research gaps. In this paper, an experimental system for single generation at pressure has established. By means high-speed photography...