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In this paper, one robust adaptive controller is proposed for hypersonic flight dynamics with high gain observer (HGO) and neural networks (NNs). For the attitude subsystem, it contains flight path angle, pitch angle and pitch rate. To avoid the complex back-stepping design, the dynamics are transformed into the normal feedback form. With HGO estimating the newly defined states, the controller is...
Recently numerous controller designs have been developed for the longitudinal dynamics of hypersonic flight vehicle in cruising phase. Among these methods, back-stepping is widely studied since it provide the systematic design dealing with mismatched uncertainty. This paper first presents the nonlinear formulation for the dynamics and then the recent back-stepping related design is reviewed such as...
The p-xylene (PX) oxidation process is of great industrial importance because of the strong global polyester fiber demand. Usually, the optimization of operating conditions for this process is specified in terms of the combustion loss caused by the side reactions. When the optimization objective only refers to the economical performance of the p-xylene oxidation process, the product of the side reactions...
This paper presents dynamic surface control for longitudinal dynamics of a generic hypersonic flight vehicle in presence of unknown dynamics. For the attitude subsystem, the minimal-learning-parameter technique is combined with dynamic surface design. The uniform ultimate boundedness stability is guaranteed via Small-gain Theorem. The singularity problem is removed and the simpler adaptive algorithm...
Location-based mobile applications such as Foursquare and Jiepang help bridge the gap between offline and online. People that we encounter and connect with around physical resources such as conferences, provide opportunities for extending our social networks from offline to online. We give a preliminary study on the relationship between the online and physical social networks in terms of the online...
This paper presents adaptive asymptotic tracking control of a class of uncertain strict-feedback discrete-time nonlinear systems subjected to parametric and nonparametric model uncertainties with unknown periodic time delay. Using states information in the past instant to compensate for non-parametric uncertainties at the current instant, constructive adaptive control is developed based on predicted...
This paper presents the flight path angle tracking control of the longitudinal dynamics of a generic hypersonic flight vehicle(HFV). Due to the use of digital computers and microprocessors for controls applications, the discrete hypersonic flight control is investigated. The altitude command is transformed into the flight path angle information. The back-stepping scheme is applied for the attitude...
Location privacy has been a serious concern for mobile users who use location-based services provided by the third-party provider via mobile networks. Recently, there have been tremendous efforts on developing new anonymity or obfuscation techniques to protect location privacy of mobile users. Though effective in certain scenarios, these existing techniques usually assume that a user has a constant...
Accelerating Genetic Algorithm (AGA)'s disadvantages of unable to search the optimal solution when the solution is in the boundary of feasible region was proved through theoretical analysis and numerical experimentation. The solution of adding random individuals whose variable obeying to saddle distribution into initial population to increase the ability of searching the optimal solution in the boundary...
Historical photos constitute an important part of architectural heritage documents and achieves. They are also one of the important bases for “authenticity” in the practice and research of architectural heritage conservation. From 1921 to 1929, Tokiwa Daijo has investigated into Chinese cultural relics for five times and has taken many photos. These photos perfectly outlined the cultural relics' status...
Although MVC pattern is widely used in software design and development, bringing us many advantages, it still has weak points. Author puts forward an improved MVC and applies it to stowage plan component design in container terminal management system.
Networked education has been popular in China and quality of such education should not be scarified by low cost. Reflection evaluation is one key part in evaluating the education quality. This paper presents a reflection evaluation method in online e-learning system on the basis of hyperlinks analysis.
Compared with class-room teaching, distance education system has significant advantages especially the lower cost and ability of maintenance. The practice of course management is introduced and the studentspsila learning path is presented. The quality of education is paid particular attention, and the quality evaluation criteria are proposed. Since the systems are designed on the basis of open source...
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