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Pedestrian detection for surveillance video, which is the basic of person re-identification, aims to capture the pedestrians in the monitors. However, the existing pedestrian detection algorithms still have two issues: (1) The recall and precision are not applicable for complicated scenes; (2) It is limited for processing the high-resolution video in real-time. Therefore, pedestrian detection algorithm...
A dielectric elastomer membrane is prestretched firstly and held by a circular rigid frame, it may form wrinkles or bulging with increasing applied voltages. Experiments and theory in this paper investigate phase transitions on a circular DE film. Experimental phenomena were found out before electric breakdown, active region of a membrane expanded against the passive region, sometimes bulging formed...
In bridge buildings, concrete is widely used because its materials are considerably low-cost and it has high plasticity. However, some drawbacks exist in this kind of bridges, and crack is the most common ones. In order to avoid the cracks in bridge buildings becoming worse, it is necessary to periodically perform the inspection for it. Thus, a bridge inspection robot system with machine vision is...
In this paper, we propose a monocular SLAM system for robotic urban search and rescue (USAR), based on which most USAR tasks (e.g. localization, mapping, exploration and object recognition) can be fulfilled by rescue robots with only a single camera. The proposed system can be a promising basis to implement fully autonomous rescue robots. However, the feature-based map built by the monocular SLAM...
In this paper, a virtual synchronous generator with photovoltaic energy storage hybrid system (VSG-PV) is adopted. VSG-PV can not only output the maximum power of photovoltaic, but also can maintain a stable voltage and frequency of the point of common coupling when system worked in the island model comparing to the conventional photovoltaic generation system. The small signal model of the hybrid...
Urban evacuation is of great significance in saving human lives when disasters strike major cities. Comparing with the large population to evacuate, the number of evacuation guiders is much smaller. Since the location of evacuation guiders can greatly influence the evacuation process, it is crucial to identify the most critical locations to assign guiders. The assignment optimization for evacuation...
LiFePO4 battery has been widely used in electric vehicles due to high safety and long cycle life. This paper firstly analyses the basic characteristics of LiFePO4 battery including the capacity and internal resistance. Secondly, particle filter (PF) algorithm is introduced to predict the remaining useful life (RUL) of LiFePO4 battery effectively. Based on the LiFePO4 battery life degradation data,...
Aiming at improving the level of the Human-Robot Interaction (HRI), a novel HRI system based on 3D mapping and virtual reality (VR) is proposed, in the background of rescue robots. In the HRI system, the rescue robot constructs a 3D map in the complex post-disaster environment based on a multi-line LiDAR and an inertial measurement unit (IMU) in real time. The map is represented using 3D-NDT, which...
To meet the higher requirements of human-machine interface technology, the quadruped robot with human recognition capability is discussed in this paper. We present a marker tracking system which uses laser scanner and pan-tilt to allow a particular user to designate himself as the robot's leader. Optimal motion curve of pan-tilt is planned so as 3D point clouds can be returned by a rotating 2D laser...
We developed a simple and novel liquid pendulum-based side-polished fiber Bragg grating (FBG) tilt sensor. Sucrose solution of ∼36 ml with a refractive index (RI) of 1.435 was dispensed into a plexiglass container preprocessed by hydrophobic agent, where the side-polished FBG with a D-shaped polished zone of ∼54 μm depth and ∼15 mm length was attached on the side wall. The liquid level changes caused...
We demonstrate a flexible wearable optical fiber strain sensor using side-polished fiber Bragg grating (FBG) with a D-shaped polished zone of ∼54 μm depth and ∼15 mm length. The opto-mechanical response of the sensor embedded in a biocompatible polydimethylsiloxane elastomer is firstly investigated through various subtle wrist pulse tests. In comparison to a bare FBG, the developed sensor exhibits...
When the multilevel fast multipole algorithm (MLFMA) is adopted to accelerate the solution of matrix equation generating by the volume-surface integral equation (VSIE), different submatrix-selecting schemes of near-field matrix preparing for constructing sparse approximate inverse (SAI) preconditioner are discussed. Numerical result indicates that for VSIE, a SAI preconditioner with high quality can...
In this paper, a novel W-band microstrip patch antenna array with 45 degree polarization is proposed. In order to excite the 45 degree radiation mode, a slot is etched on the patch. Also, second-order inductive window is utilized to achieve better impedance matching. The antenna is fabricated with single-layer PCB process, and good agreement between the experiment and simulation results is obtained...
Array antennas for 77GHz automotive radar application are designed and measured. Linear series-fed patch array (SFPA) antenna is designed for transmitters of middle range radar (MRR) and all the receivers. A planar SFPA based on the linear one and substrate integrated waveguide (SIW) feeding network is proposed for transmitter of long range radar (LRR), which can decline the radiation from feeding...
Time based regulation is considered an effective way to reduce the driver fatigue risk. However, the maximum driving hours or limitation of accumulated driving hours differs from countries. The purpose of this study is to estimate the time-based fatigue level and establish the prediction model. Twenty-seven field driving trails were conducted to gather the fatigued driving data. Then the fatigue level...
Fatigue driving is one of the major reasons causing road traffic accidents. With the purpose to propose one recognition fatigue model, the measurements of vehicle control characteristics, physiological and psychological under fatigue have been studied through dynamic and static driving tests in the paper. ANOVA test results indicated that there is a significant difference between normal condition...
This paper investigates the contributing factors of the driving risk of naturalistic driving using k-means clustering and ordered logit regression. A naturalistic driving experiment is conducted in order to collect driving data on Chinese roads especially on the roads of the City of Wuhan. K-means clustering method is adopted to a group near crash events according to their driving risk. In addition,...
Taxi trajectories can reflect human mobility over urban roads' network. Although taxi drivers cruise the same city roads, there is an observed variation in their daily incomes. To reveal the reasons behind this issue, this study introduces a method for investigating and understanding the impact of human mobility patterns (taxi drivers' behavior) on drivers' income. Firstly, a method for classifying...
This paper investigates an induction machine using a novel concept of a converter-fed rotor. The stator is directly connected to the grid while the rotor is fed by a converter with a floating capacitor over the dc-link. In earlier work this topology has shown to be capable of improving the power factor and efficiency of a 4-pole induction machine. This paper explores the possibility to improve the...
Two linear hall sensors are utilized to detect the mover position of permanent magnet linear motor (PMLM) in this paper. To eliminate the harmonics of the sensor signals, suboptimal multiple fading Kalman filter (SMFEKF) is utilized to estimate the mover position. The third-order harmonic is considered into the observation model of SMFEKF, and high-order harmonics are considered as measurement noise...
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