The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this study, the hierarchical backstepping control (HBC) is used for the trajectory-tracking of autonomous underwater vehicles (AUV) subject to uncertainties (e.g., current disturbances). The proposed HBC utilizes hierarchical structures of the backstepping control based on the kinematic and dynamic models such that both the virtual velocity control and trajectory-tracking of the AUV lead to asymptotic...
Visual surveillance is widely used in monitoring, entertainment and public security in recent years. This arouses the growing demand of automatic analysis system to deal with large amount of data produced by video cameras. Human action recognition is one of the most popular topics in video analysis. However, human activities are extremely complex and the dimensions of features extracted from a video...
In the beginning, the kinematic model, dynamic model of a differential mobile robot (DMR), and the dynamic model of left- and right-wheel DC motors are combined to be a controlled system. The control inputs of the proposed controlled system include the input voltages for the left- and right-wheel motors, i.e., two inputs. On the other hand, the system outputs contain two-dimension position and its...
Due to the under-actuated feature, the reference signals using the combination of the system outputs, whose number is larger than that of reference signal, are designed so that the number of control inputs and sliding surfaces is the same, and that the uncontrolled mode is indirectly controlled. Under the uncertain environment, the variable structure under-actuated control (VSUC) with the satisfaction...
Due to the under-actuated feature, the reference signals using the combination of the system outputs, whose number is larger than that of reference signal, are designed so that the number of control inputs and sliding surfaces is the same, and that the uncontrollable mode is indirectly controlled. Under the uncertain environment, the sliding-mode under-actuated control (SMUC) with the satisfaction...
Hybrid under-actuated control for the autonomous dynamic balance of a running electrical bicycle including frictional torque and motor dynamics is developed, where includes two control inputs: steering and pendulum voltages, and three system outputs: steering, lean and pendulum angles. Due to the under-actuated feature, two novel reference signals using three system outputs are designed so that the...
Based on the previous studies, the dynamic balance of an electrical bicycle includes two control inputs: steering and pendulum torques, and three system outputs: steering, lean and pendulum angles. Two novel reference signals are first designed so that the uncontrolled mode is simultaneously included into these two control modes. Two scaling factors for each subsystem are first employed to normalize...
In the financial crisis, many enterprises suffer great losses. The mainly reason is the deficiency in financial forecast derived from the shortcoming of financial data model. The legacy financial data model just shows the assets amount of an enterprise and the proprietorship of its assets. Traditional data model couldnpsilat show the stockholders the risk of the enterprisespsila operating, we engage...
With progress of information technology, it is necessary to access multiple heterogeneous databases in order to get the desired information from different sources. One main problem encountered constantly among heterogeneous databases is entity heterogeneity, which arises when the same real-word entity type is represented using different identifiers in different application domains. So identifying...
In an electric bicycle, two strategies are taken up to stabilize the running motion of a bicycle. One is the control of its center of gravity (CG), and the other is the control of its steering angle of handle. In general, the control of the CG is used a pendulum. In addition, the motion of a bicycle often possesses a lean angle with respect to vertical direction. In this situation, the proposed system...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.