There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

The Design and Analysis of Experiments

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

This review focuses on inverter technologies for connecting photovoltaic (PV) modules to a single-phase grid. The inverters are categorized into four classifications: 1) the number of power processing stages in cascade; 2) the type of power decoupling between the PV module(s) and the single-phase grid; 3) whether they utilizes a transformer (either line or high frequency) or not; and 4) the type of grid-connected power stage. Various inverter topologies are presented, compared, and evaluated against demands, lifetime, component ratings, and cost. Finally, some of the topologies are pointed out as the best candidates for either single PV module or multiple PV module applications.

A review of single-phase grid-connected inverters for photovoltaic modules

This paper presents a mixed integer quadratic programming to minimize the operation cost of isolated microgrid using diesel generator and energy storage. The deployment of energy storage with the distributed generators is an effective method for storing the energy for utilization during high load periods. The proposed method is applied on a power system with 3 diesel generators and energy storage serving as backup to meet the required load. The cost of microgrid is optimized by optimal dispatch of generators and power discharged by energy storage during peak load periods. The results show that the optimum cost of microgrid is achieved when the diesel generators dispatch the maximum power to load and the energy storage is used only during the peak load periods when the generators capacity is insufficient to fulfil the load demand.

Dynamic Economic Dispatch of Isolated Microgrid with Energy Storage Using MIQP

This paper presents a single-phase shunt active power filter with artificial intelligence based algorithms by introducing a new Simplified Adaptive Linear Neuron (ADALINE) algorithm for harmonics extraction. The proposed harmonics extraction is an innovative work over the established algorithm, known as Modified Widrow-Hoff ADALINE algorithm. Three significant major improvements are made by modifying weight updating technique which leads to introduction of fundamental active current updating technique, removing cosine component according to symmetrical theory of periodic signal, and minimizing large average square error by removing sum of elements. The SAPF with the proposed harmonics extraction algorithm was simulated in MATLAB/Simulink. For practical validation, the experimental laboratory prototype was also developed, and the algorithm was implemented using Digital Signal Processor TMS320F28335. Both simulation and experimental tests cover different types of nonlinear loads and dynamic operation of loads. From simulation and experimental results, significant improvements in terms of Total Harmonic Distortion and response time are shown together with comparison analysis with the established algorithm.

/pdf/simplified-adaptive-linear-neuron-harmonics-extraction-4pbrck9hiv.pdf

Simplified Adaptive Linear Neuron Harmonics Extraction Algorithm for Dynamic Performance of Shunt Active Power Filter

With the increasing concern in Photovoltaic (PV) as distributed resource (DR) nowadays, the power quality issues associated with PV usage became more and more challenging Reactive power compensation and voltage regulation are the most important power quality issues, which have to be considered when connecting PV panels to a utility grid This paper studying how a PV source can achieve a reactive power compensation when connected to a distribution network The interconnection between DC source (PV) and utility, performed by an inverter Pulse width modulation (PWM) technique used in this paper to control the inverter to get optimum values for DC link voltage and reactive power at the point of comment coupling (PCC) Matlab/Simulink reveals the effectiveness of the controller

Distributed photovoltaic generator performing reactive power compensation

Although sun is the source of all forms of energy including the energy contained in fossil fuels, the term “solar energy” is meant the energy obtained directly from sun’s radiation. Solar photovoltaic (PV) is the most promising of all the active solar energy technologies. This technology is affordable and the source of this energy is inexhaustible. Moreover, it is the cleanest source of energy developed so far, thereby establishing it as a sustainable solution to solve energy crisis. This chapter presents a succinct picture of the solar PV technology along with classification and application areas. The status of the technology maturity and energy–exergy and economic aspects of PV technology has also been addressed.

Solar Photovoltaics (PV): A Sustainable Solution to Solve Energy Crisis

This research aimed to design a three-phase ac-dc buck converter to achieve low-THD unity-power-factor sinusoidal input current and regulated dc voltage via modified pulse-width-modulation (PWM) technique. A 6-switch topology with bidirectional power flow capability is presented. The modified PWM switching strategy is discussed and verified via Matlab-Simulink and implemented in Digital Signal Processor (DSP) TMS320F28335. The topology and the switching technique performed well for sinusoidal input current, power factor, harmonic distortion level of the ac input currents, and regulated dc voltage, and enabled return of power flow from the dc side back to the ac. Simulation using Matlab-Simulink is presented to verify the effectiveness of the circuit configuration.

http://eprints.um.edu.my/7019/1/Bidirectional_three_phase_power_converter.pdf

Nasrudin Abd Rahim

Papers

Dynamic Economic Dispatch of Isolated Microgrid with Energy Storage Using MIQP

Simplified Adaptive Linear Neuron Harmonics Extraction Algorithm for Dynamic Performance of Shunt Active Power Filter

Distributed photovoltaic generator performing reactive power compensation

Solar Photovoltaics (PV): A Sustainable Solution to Solve Energy Crisis

Bidirectional three phase power converter