7294 research outputs found
Sort by
Large Signal Analysis of the Infrared Semiconductor Mercury-Cadmium-Telluride Detectors
Get PDFA mathematical model for the relationship between the output voltage and incident radiation of the infrared semiconductor mercury-cadmium-telluride (MCT) detector is presented. The model, basically a sine-series function, can easily yield closedform expressions for the harmonic and intermodulation performance of the MCT detector with large-amplitude multisinusoidal incident radiation. The special case of two-tone equalamplitude incident radiation is considered in detail. The results show that the second-order harmonic and intermodulation products are always higher than the third-order components. Moreover, the results show that the second-order intermodulation is always dominant
Dynamic Performance of a Wind Generation System with Thyristor Controlled Capacitor Compensation
Get PDFA dynamic model of a variable speed cage machine wind generation unit, including wind profile, wind turbine, induction generator, local load and transmission line connecting the grid is developed. The steady state as well as the dynamic performance of the wind energy system is explored. The performance of the system under wind gust conditions has been studied and the amount of transient injection to the grid investigated. A stabilizing control scheme which minimizes the transient injection through a thyristor controlled variable capacitance at the generator terminal is explored. PI controller with optimized gain settings is included in the control loop. The ‘optimal’ parameters of the PI controller are obtained through a pole-placement technique. The PI controlled variable capacitance strategy has demonstrated very good damping profile for the wind turbine-generator power system
"signal performance of micromachined silicon inductive microphones"
Get PDFA mathematical model for the open-circuit output voltage of a micromachined silicon inductive microphone is presented. The model, basically a sine-series function, can easily yield closed-form expressions for the amplitudes of the output components resulting from a multisinusoidal input acoustic pressure. The special case of an equal-amplitude two-tone acoustic pressure input is considered in detail. The results show that, the microphone generates both even and odd-order harmonic and intermodulation products
"Harmonic and intermodulation performance of class-AB stages"
Get PDFA new technique for predicting the harmonic and intermodulation performances of class-AB stages is presented. The proposed technique is based on modelling the transfer characteristic of the class-AB stage using a Fourier-series approximation. The number of terms of the Fourier-series is decided based on the required accuracy and the coefficients of the series are obtainable using simple hand calculations. The results obtained are in excellent agreement with simulation results and confirm that the intermodulation performance is dominant compared to the harmonic performance
Dynamic Performance Improvement of an Isolated Wind Turbine Induction Generator
No full textA dynamic model of a variable speed stand alone wind generation unit is developed. The steady state as well as the dynamic performance of the wind energy system is explored. The necessary conditions for steady operation have been established. The performance of the system under variable wind gust and other disturbance conditions has been studied. It has been observed that a stand alone generator is very vulnerable to transient variations in the system. This is because of the lack of excitation to the unit. A stabilizing control scheme through a thyristor controlled variable capacitance at the generator terminal is suggested for stabilizing the system. PI controller with optimized gain settings is included in the control loop. The PI controlled variable capacitance strategy has demonstrated very good steady state and transient performance improvement of the wind turbine-generator syste
A Hybrid, PDE-ODE Control Strategy for Intercepting an Intelligent, Well-Informed Target in a Stationary, Cluttered Environment
Get PDFIn [15], [16] a new class of intelligent controllers that can semantically embed an agent in a spatial context constraining its behavior in a goal-oriented manner was suggested. A controller of such a class can guide an agent in a stationary unknown environment to a fixed target zone along an obstacle-free trajectory. Here, an extension is suggested that would enable the interception of an intelligent target that is maneuvering to evade capture amidst stationary clutter (i.e. the target zone is moving). This is achieved by forcing the differential properties of the potential field used to induce the control action to satisfy the wave equation. Background of the problem, theoretical developments, as well as, proofs of the ability of the modified control to intercept the target along an obstacle-free trajectory are supplied. Simulation results are also provided
Identification of Different Kinds of Plastics Using Laser Induced Breakdown Spectroscopy for Waste Management
Get PDF
Iterative Least Squares Functional Networks Classifier
Get PDFThis paper proposes unconstrained functional networks as a new classifier to deal with the pattern recognition problems. Both methodology and learning algorithm for this kind of computational intelligence classifier using the iterative least squares optimization criterion are derived. The performance of this new intelligent systems scheme is demonstrated and examined using real-world applications. A comparative study with the most common classification algorithms in both machine learning and statistics communities is carried out. The study was achieved with only sets of second-order linearly independent polynomial functions to approximate the neuron functions. The results show that this new framework classifier is reliable, flexible, stable, and achieves a high-quality performance. Index Terms—Functional networks, minimum description length, statistical pattern recognition
"Infusing Critical Thinking Skill Classification into a Software Engineering Course:,
No full textLife long learning is important to keep oneself up-to-date in ones profession. Due to the rapid evolutionary nature of computer science, life long learning becomes even more important. Equipping the students with critical and creative thinking skills can make learning more effective. Critical and creative thinking skills can be taught either by offering explicit courses on such topics or the important skills can be infused into the contents of various courses in the computer science or computer engineering programs. Teaching critical skills along with the course contents can prove itself more appropriate than only transferring the subject knowledge(course content). Some topics may provide a very natural way to teach a critical thinking skill. This paper describes some of our efforts in infusing the critical thinking skill of classification into a course on Principles of Software Engineering in our undergraduate computer science curriculum