Haiqing Liu

Shandong University of Science and Technology · College of Transportation

Concerning roadside traffic detection applications, and to address the millimeter-wave radar’s missing data problem caused by target occlusion or the absence of features in low-speed conditions, this paper proposes a trajectory compensation method regarding car-following behavior. Referring to the installation scheme of the detector, a coordinate t...

Abstract In a new application scenario where the millimetre‐wave radar is installed above the road for detecting traffic flow in downward looking direction, the original data of the radar includes all kinds of background noises and false targets. In order to acquire effective vehicle trajectories, a two‐step abnormal data processing method for mill...

Speed guidance is a significant application in the driver assistance system or driverless automated system. Considering passengers’ comfort under different road conditions, this paper proposes an optimal vehicle speed trajectory planning strategy using the nonlinear programming solution method. In this method, the Pearl curve is taken as the basic...

With the rapid use of Android OS in mobile devices and related products, face recognition technology is an essential feature, so that mobile devices have a strong personal identity authentication. In this paper, we propose Android based software development framework for real-time face detection and recognition using OpenCV library, which is applic...

The vehicle license plate data obtained from video-imaging detectors contains a huge volume of information of vehicle trip rules and driving behavior characteristics. In this paper, a real-time vehicle trajectory prediction method is proposed based on historical trip rules extracted from vehicle license plate data in an urban road environment. Usin...

Transit signal priority (TSP) is a typical strategy used to reduce the delay in public transit and it has been used extensively to improve the transit operations in urban traffic systems. This paper proposes a transit signal priority controlling method considering both the non-transit traffic benefits and the coordinated phase states for multi-ring...

Real-time transit signal priority (TSP) control is affected by coordination phase and deprive non-transit traffic benefits. In this paper, fully considering the migration states of coordinated phases and queuing states of non-transit vehicles, a transit signal priority controlling method is proposed for the single-ring sequential phasing under the...

The Real-time traffic status estimation in urban signalized intersections is highly valuable for modern traffic control and management. This paper presents a real-time queue length estimation method based on probe vehicles data in connected vehicle (CV) environment. The probe data is used to identify the stopping states of connected vehicles. Based...

The millimeter-wave radar has been widely used in traffic applications. However, little research has been done to install the millimeter-wave radar on the top of a road for detecting road traffic flow at a downward looking direction. In this paper, the vehicle parameters, including the distance, angle and radar cross-section energy, are collected b...

Confined by the real-time and accuracy of traditional traffic collecting parameters, the existing traffic delay estimation models are generally with poor performance in guiding practical applications. In the Cooperative Vehicle-Infrastructure System, the real-time entire space-time driving state information of a single intelligent vehicle provides...

The large-scale VANET implies the network which covers a wide range of geographic space and contains a huge number of vehicles in urban scenario. The performance of traditional data transmitting protocols will be sharply decreased in such networks. In this paper, we propose a new data transmitting scheme based on improved AODV and RSU-assisted forw...

The performance of traditional AODV protocol will be sharply decreased in the scenario of large-scale VANET, which covers a wide range geographic space and contains a huge number of vehicles. This paper proposes an improved AODV routing protocol based on restricted broadcasting by communication zones for data transmitting in large-scale VANET. The...

Differing from the physical connectivity of the topology structure, the logical connectivity of VANET considers both the interior network configuration and the external communication environment. Hence, the traditional mathematical analysis and modeling methods which are usually used in physical connectivity research are no longer suitable for the...

IEEE 802.11p vehicular ad hoc network (VANET) applies multiple channels, including one control channel (CCH) and six service channels (SCHs); the enhanced distributor channel access (EDCA) mechanism is used to support wireless channel assignment and QoS requirements. But the method of SCH assignment is not proposed in IEEE 802.11p standard. We pres...

Dynamic Route Guidance System, which can provide the drivers with the optimal routes, is one of the most efficient solutions to the traffic jam. This paper presents a bee inspired zonal vehicle routing algorithm to provide a reasonable and effective optimal route for the Dynamic Route Guidance System. Firstly, the proposed algorithm divided the who...

In order to overcome the defects such as too many cluster heads and large overhead in traditional single hop VANET clustering algorithms when there are high density vehicles, this article proposes a multi-hop cluster algorithm named the Position Sensitive Clustering Algorithm (PSCA). Based on the establishment of cluster structure, initial cluster...

IEEE 802.11p Vehicular Ad-Hoc Network (VANET) applies one control channel (CCH) and six service channels (SCHs). CCH is dedicated for broadcasting traffic safety messages, SCHs are dedicated for transmission of varying application messages. In IEEE 802.11p standard, Coordinated Universal Time (UTC) scheme is recommended for coordinating channel acc...

Vehicular Ad-Hoc Network (VANET) is an essential technology to improve safety and efficiency of Intelligent Transportation System (ITS), it provides vehicle to vehicle as well as vehicle to roadside unit (RSU) wireless communications, so that on board unit (OBU) located in vehicles can share messages related to road traffic with not only other OBU...