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In imaging process of digital cameras, digital number (DN) of images is often automatically compensated for effectiveness of human vision. In this study, DN correction based on gamma transformation theory is combined with a look-up table method to convert the output DN into a calibrated digital number (cDN). Then, the leaf area index (LAI) of paddy rice is estimated from gap fraction measurement in...
This paper presents a benchmark investigation on control algorithms for active trailer steering (ATS) systems of articulated heavy vehicles (AHVs). Two control algorithms are designed for the ATS systems of AHVs, which are derived using the Fuzzy Logic Control (FLC) and Linear Quadratic Regulator (LQR) techniques, respectively. The two algorithms are evaluated through dynamic simulations of an AHV...
Aiming to the shell protection for the circuit, on the basis of analysising the relationship between the stress on passing the cover of protective shell and the least plastic flection stress, utilizing the principle of the wave front conservation, the equation is built to evaluate the impact resistance on protective shell, and the evaluation factor of the impact resistance can be extracted from this...
The grid method of global path planning is widely used on mobile robots. We introduce a new algorithm of the grid method based on main directions of the gird map to improve the performance of this approach. Specifically, we conduct experiments to demonstrate its positive effect through reducing the number of nodes for test in global path planning. The results obtained from such experiments prove this...
Multiple regression method is used in this article to research the relationship between indicators of economic transformation and three industries' output value, in order to analyze the relationship between economic transformation and three industries and extent that the economic transformation affects the industrial development. In this article the data of Beijing from 1996 to 2006 is used for analyzing,...
An improved AC standstill inductance measurement method for interior permanent magnet synchronous machine (IPMSM) is proposed in this paper. Only the 3-phase voltage source, oscilloscope, and DC voltage source are required in this method, rather than the dynamometer and vector controller in the other methods. Depending on the derivative q- and d-axis voltage equations in the stationary reference frame,...
The paper describes the composition structure and key technology of a mobile intelligent training system (MITS),it can be used for cockpit learning and flight training. By tracking the position and orientation of learner's head,this system can perceives the learner's interest, and then displays the corresponding teaching information on the head mounted display (HMD). The design of this system involves...
Hands-free is very important in the design of human-computer interaction (HCI) in the application of virtual reality or augmented reality (AR). Head tracker with six-degrees-of-freedom (6-DOF) is common used in AR, without additional devices, this paper presents a new and practical approach to design HCI by virtue of it. The design includes two steps: the first is the calibration or initialization,...
Tracking the position and orientation of learner's head, the cockpit intelligent tutoring system (CITS) based on augmented reality perceives the learner's interest, and then displays corresponding teaching information on the head mounted display (HMD). The system modeling involves the depiction of main framework and the mathematical solutions of subsystems. Cockpit components can be abstractly regarded...
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