The hybrid AC-DC microgrid (HMG) architecture has the merits of both DC and AC coupled structures. Microgrids are subject to intermittence when the renewable sources are used. In the HMG, since power fluctuations occur on both subgrids due to varying load and unpredictable power generation from renewable sources, proper voltage and frequency regulation is the critical issue. This article propos...

Various restrictions on transformational grammars have been investigated in order to reduce their generative power from recursively enumerable languages to recursive languages. It will be shown that any restriction on transformational grammars defining a recursively enumerable subset of the set of all transformational grammars, is either too weak (in the sense that there does not exist a genera...

Value prediction has been proposed for breaking datadependencies and increasing instruction level parallelism. One of the drawbacks of many of the proposed techniques is that the value predictors require very large hardware structures which use up many transistors and can consume a large amount of energy. In this study, we use data-widths to partition the value prediction table into several sma...

High peak to average power ratio of the transmit signal is a major drawback of OFDM systems. After defining the PAPR and analyzing its statistical properties, some of the most representative PAPRreduction techniques available in the literature are reviewed in detail. Several methods have been proposed to reduce the peak power of OFDM signals. In this paper the effectiveness of some recently pro...

Most previous low-power personal computer designs have been either focused on power efficiency improvement or on software power management in the working states. This research aims to reduce the total standby power amount in the off state. The authors accomplish the goal of reducing the power consumption by a wake-up device which is replaced by a chip with a still lower consumption. The authors...

Autonomous wireless devices for healthcare monitoring become a reality only if such devices are embedded with enough intelligent and processing capabilities to minimize the amount of data being transferred through the wireless network. Also, the embedded processing capability must be made energy efficient so that the device can operate on scavenged energy or very limited battery power. This pap...

T he growth of business enterprises and the Internet's emergence as a data processing medium have caused server-centric applications to proliferate. Data-centric services , such as file servers, Web portals, and transaction-processing systems have become commonplace in large corporations, smaller businesses, and academic institutions. Further, search engines such as Google and e-mail services l...

INTRODuCTION POWER electronics is a technology for using power devices to convert efficiently electric power into the optimum characteristics. As a key component for improving the energy efficiency and performance of various equipment, power electronics contributes to the realization of both a prosperous and comfortable way of life and a sustainable society by reducing CO2 (carbon dioxide) emis...

this paper presents a novel method to calculate the reference source current and the referencecompensating current for shunt active power filters (sapfs). this method first calculates theamplitude and phase of the fundamental load current from a recursive algebraic approach blockbefore calculating the displacement power factor. next, the amplitude of the reference mains currentis computed with ...