Yiwen Zhao

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The formation control of multiple vehicles using a perceptive frame is studied in this paper. The method is applied to multiple mobile robots. The controller design and lab experiments are shown in the paper. Some useful strategies of coordination are implemented in a perceptive frame by reference projections. The feature of the coordination is illustrated(More)
BACKGROUND To define the sites where the lateral femoral cutaneous nerve (LFCN) is more easily visualized and to describe the anatomical variations of the LFCN. METHODS A total of 240 LFCNs in 120 volunteers were evaluated with 18 MHz ultrasound; the intermuscular space between the tensor fasciae latae muscle and the sartorius was used as an initial(More)
Traditional APF-based mobile robot path planning approaches posses an inherent problem which is the formation of local minimum that probably prevent robot from arriving at the target. In view of those considerations, an improved potential field function is proposed to settle this problem. The new method includes an improved attractive potential function and(More)
When the autonomous mobile robot (AMR) is popular in unknown environment, accurate estimation of SOC (state of charge) is becoming one of the primary challenges in autonomous mobile robots research. However, as defects of the extended Kalman filter (EKF) in nonlinear estimation, there exists estimated error, which affects the estimation accuracy, when it is(More)
Lithium-ion battery is a kind of advanced sources and is a quite complex and nonlinear system comprised of interacting physical and chemical processes. Its state-of-charge (SOC)/ battery residual capacity (BRC), which is parameters to describe how much energy battery has, is key factors in applications; its estimations is an important and challenging task.(More)
This paper investigates real-time road detection for an unmanned ground vehicle (UGV) to navigate in a campus environment. A novel vision system with two monocular cameras at different heights and angles is utilized to accomplish both road region detection and direction estimation tasks simultaneously. An Adaboost-based classifier is used in the road region(More)
To investigate the incidence and pattern of traumatic spinal fractures (TSFs) and associated spinal cord injury (SCI) resulting from motor vehicle collisions (MVCs).This was a cross-sectional study. We retrospectively reviewed 698 patients with TSFs resulting from MVCs admitted to our university-affiliated hospitals from 2001 to 2011. The incidence and(More)
To investigate the incidence and pattern of patients managed for traumatic upper cervical spinal fractures (TUCSFs) in teaching hospitals in China over 13 years.We retrospectively reviewed 351 patients with TUCSF admitted to our teaching hospitals. Incidence rates were calculated with respect to age, gender, etiologies of trauma, anatomical distribution,(More)