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This article describes universal tracking control method. It is based on model linearization in every point of trajectory. Tested device is an inertial wheel pendulum (IWP). This is an underactuated nonlinear object — two degrees of freedom (angle from vertical and angle of rotation of electric motor) and one actuator (current). The linear quadratic regulator (LQR) and the model of the object are...
This paper describes a method aimed at producing reduced order models in state-space form for speeding up the transient thermal simulation of mechatronics products. Designed in a non-intrusive framework, this method is implemented as an offline tool that post-processes the inputs and outputs of a detailed reference model considered as a black box. The reduction algorithm is based on robust linear...
The entity disambiguation task partitions the records belonging to multiple persons with the objective that each decomposed partition is composed of records of a unique person. Existing solutions to this task use either biographical attributes, or auxiliary features that are collected from external sources, such as Wikipedia. However, for many scenarios, such auxiliary features are not available,...
Placing appropriate numbers of PMUs is critical to collect phase angle data for best identifying multiple line outages in wide-area transmission system, because of high deployment costs. This work focuses on exploring the global optimal strategy of PMU deployment for maximizing the average identification capability of multiple line outages. Inspired by Kullback-Leibler (KL) distance, this paper proposes...
The paper shows that the manifestation of Hamilton principle in electric power system is tending of its states to self-optimization. Characteristic feature of these states is minimum dissipation of electric energy during its transmission. The possibility and expedience of this principle usage for optimal control of normal modes of electric power system is shown.
Digital control has significantly advanced in the last decade enabling the implementation of higher performance controllers using digital devices such as microcontrollers, DSPs or FPGAs. The design and implementation of controllers using FPGAs is often a challenging and time-consuming task. In order to improve this process, high level synthesis tools allow the use of high-level programming languages,...
The Automatic Identification System (AIS) is becoming a cornerstone of maritime situational awareness. Nevertheless, AIS suffers the lack of security measures that makes it prone to receiving vessel positions that are unintentionally incorrect, jammed or deliberately falsified. In this work we consider the processing of Time Difference of Arrival measurements from a network of AIS base stations using...
Circular microphone arrays facilitate spatial processing and analysis of sound fields in applications where the sound field sources are primarily expected from the azimuthal directions. The operating frequency bandwidth of the array depends on the array aperture and on the number of microphones. At high frequencies, spatial aliasing generates side-lobes in the array beam pattern, which limits array...
Most non-sinusoidal power theories have been developed from theoretical techniques, as well as relying on hypothetical and experimental networks to highlight the advantages of each. The drawback of the power theories is that no single one has been universally accepted as a benchmark for other developments. This paper will however show this weakness by means of evaluating two power theories in the...
In recent years, cross-site scripting attacking usually occurred on the social networks. The attackers hide the malicious script codes in web links, and easily get personal sensitive information if someone clicks these links. This article firstly analyzes the characteristics of the social network topology and the relationships of network users, and then establishes the worm propagation model in order...
Efficiency represents an important parameter that characterizes a mechanism or a machine. This value gives fundamental information about the energy that is lost during the process. Machines or mechanisms can be combined in order to build a more complex system. For example, they can be arranged as a series or as a parallel layout. For these cases, the efficiency can be easily evaluated. However, in...
The LANDMARC system is a radio frequency identification (RFID) based location system and has attracted great attention recently. In our implementation of the LANDMARC system, we have observed that some unusual large errors occur in the traditional LANDMARC. Thus, in this study, we proposed ways of resolving these problems. There are two major ideas proposed in this study. The first one is to forsake...
The subject of this paper is the homotopy continuation method (HCM) for solving basic motion planning problems. The validity of the HCM has been demonstrated for driftless control-affine systems belonging to a special class. In this paper, we study the validity of the HCM for control-affine systems with drift. A crucial step in the validation process is to establish a certain sublinear growth condition...
Sequential linear decompressors are inherently efficient and attractive for compressing test cubes with many don't cares. The test cubes are encoded by solving a system of linear equations. In continuous decompression, typically a fixed number of free variables are used to encode each test cube in a “one-size-fits-all” manner. The non-pivot free variables used in Gaussian elimination are wasted when...
This article describes an online optimization method of an air flow control system realized in pneumatic industrial applications. With respect to the limited computational power of industrial hardware the presented algorithm is optimally designed for a low execution time and source consumption. Based on a least square optimization method the presented algorithm leads to an effective and robust control...
This paper review the effectiveness of the parity space approach to identify faults or disturbance in a system. The most commonly used is the observer based procedures, and redundancy relationship method. This involves analytical mathematical analysis of geometry and bilinear algebra. Then, technological advances which require complex computation such as artificial intelligence and genetic algorithm...
Spectrum sensing constitutes a key ingredient in many cognitive radio paradigms in order to detect and protect primary transmissions. Most sensing schemes in the literature assume a time-invariant channel. However, when operating in low Signal-to-Noise Ratio (SNR) conditions, observation times are necessarily long and may become larger than the coherence time of the channel. In this paper the problem...
In order to overcome the inherent coupling effect and the sluggish response of scalar control the vector control is employed. By using the vector control, the performance of the AC machines can be made similar to that of a DC machine. In this paper to achieve high performance the vector control of the Permanent magnet synchronous motors drive is employed. Two-axis mathematical modeling is presented...
A new technique of designing spectral null codes with permutation sequences is presented. These new codes have nulls at sub-multiples of the frequency of the transmitted symbols and are also DC-free codes. The choice of the corresponding channel levels given to each transmitted symbols has guaranteed the elimination of the DC component at the lower frequencies and gave an advantage on the binary spectral...
Different techniques exist for camera calibration based on photogrammetry or self-calibration. Much work has been done to obtain intrinsic and extrinsic camera parameters and also in data pre - and post-processing techniques. From a practical viewpoint, it is quite difficult to decide which calibration method produces the best results and even whether any data processing is necessary. This paper proposes...
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