Wencheng Tang

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Vitellogenin (Vg) cDNA from Spodoptera litura Fabricius was cloned and sequenced. The open reading frame (ORF) of Vg cDNA was 5247 nucleotides in length (GenBank Accession no. EU095334), which encoded for a protein of 1748 amino acids. S. litura Vg comprised three conserved regions (Vitellogenin-N domain, DUF1943 and von Willebrand factor type D domain(More)
We present an algebra with the purpose to efficiently simplify the fault tree structure representing static or dynamic systems, and reduce the repeated events inside. We consider logical unions made up by events as variables. Each variable is represented by an array: 1) it has three elements; 2) each element is a set; 3) the first set contains the Boolean(More)
Dynamic simulation of alveolar bone remodeling is important for orthodontic study and clinical operation, but dynamic simulation based on tissue change has never been realized. Based on a remodeling model obtained from data in literature, using a viscoelastic constitutive model of periodontal ligament obtained by experiment data fitting, the alveolar(More)
Based on the principle of double-half-revolution mechanism, this paper designed a new-style bionic walking mechanism by using two tandem planetary gear trains, which is composed of one first swiveling arm, one second swiveling arm, two striding rods and mechanism bracket, etc. The first swiveling arm and second swiveling arm are the planet carriers (also as(More)
This paper presents a method to design servo controllers for flexible ball screw drives with time-varying dynamics, which are mainly due to the time-varying table position and the workpiece mass. A gain-scheduled H∞ loop shaping controller is designed to achieve high tracking performance against the dynamic variations. H∞ loop shaping design procedure(More)
Many intelligent transportation system applications require accurate, reliable, and continuous vehicle positioning. How to achieve such positioning performance in extended GPS-denied environments such as tunnels is the main challenge for land vehicles. This paper proposes a hybrid multi-sensor fusion strategy for vehicle positioning in tunnels. First, the(More)
Deficiency has been found in the current collaborative design systems. It is difficult and inconvenient to co-design on a Web CAD tool. New products to be designed are more and more complicated, and new requirements are advanced that automatic processes need to be used in collaborative design. A new concurrent engineering (CE) model based on automatic(More)
This paper presents a method to design servo controller for flexible ball screw drives. The state space model of the flexible ball screw drive with the nonminimum phase zero is considered. An adaptive backstepping sliding mode controller with minimum tracking error prefilter is proposed to actively suppress for the vibrations and achieve high positioning(More)
The configuration combination design method of wheel-legged lunar rover was proposed, which regards the mobile mechanism of wheel-legged lunar rover as three sub-configurations: wheel-legged mechanism, suspension and bodywork. The computation model of optional configuration scheme of the lunar rover was established, which is based on isomorphic combination(More)