Miracle-dz/UniFAR-FTUs huggingface dataset:
A shunt active filter control for one-phase and three-phase four-wire systems

The proposed active filter is based on a shunt configuration made up of three one-phase current controlled VSI-PWM inverters. A deep analysis of reference and filtering waveforms during a sampling period has been carried out to obtain a relationship between electrical feedback parameters and duty cycle of switching waveform. This analysis provides a design equation for switching signal generation and effective current tracking. Simulations have been carried out to show active filter performance under highly polluting load operation. Simulation results highlight a high reduction of line current harmonic distortion with an acceptable switching frequency as well as a sensible reduction of line neutral current.
Gas-Fired Distributed Energy Resource Technology Characterizations

The U. S. Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE) is directing substantial programs in the development and encouragement of new energy technologies. Among them are renewable energy and distributed energy resource technologies. As part of its ongoing effort to document the status and potential of these technologies, DOE EERE directed the National Renewable Energy Laboratory to lead an effort to develop and publish Distributed Energy Technology Characterizations (TCs) that would provide both the department and energy community with a consistent and objective set of cost and performance data in prospective electric-power generation applications in the United States. Toward that goal, DOE/EERE - joined by the Electric Power Research Institute (EPRI) - published the Renewable Energy Technology Characterizations in December 1997.As a follow-up, DOE EERE - joined by the Gas Research Institute - is now publishing this document, Gas-Fired Distributed Energy Resource Technology Characterizations.
EQUITABLY DISTRIBUTING QUALITY OF MARINE SECURITY GUARDS USING INTEGER PROGRAMMING

Abstract : Established through the Marine Security Guard (MSG) Program during the 1940s, the Marine Corps and Department of State have shared a partnership of providing critical security to designated diplomatic facilities worldwide. Approximately 250 Marines execute permanent change-of-station orders within the program five times every year to support personnel manning requirements. Are these Marines being sent to the right location? Is one embassy unintentionally staffed with a disproportionate quality of MSGs? Is there a better metric to measure and assign Marines based on a decision-maker's preference? The current assignment process is manpower-intensive and involves more than 15 personnel across three levels of command. At present, there is no formal methodology to quantify or measure how well MSGs are being assigned. The purpose of this research is to provide Marine Corps Embassy Security Group (MCESG) Headquarters senior leaders with an alternative method to complement the current assignment process by equitably distributing the quality of MSGs using integer programming. The results of this research support an improvement by up to 96% of distributing quality using the sum of squared differences across each region. The impact of using these alternative methods can be expected to significantly decrease MCESG assignment man-hours.
Photovoltaic inverter systems with self-tuning fuzzy control based on an experimental planning method

This paper presents analysis and design of photovoltaic inverter systems with self-tuning fuzzy control. The self-tuning algorithm is based primarily on an experimental planning method which is widely used in quality control. By conducting matrix experiments via an orthogonal array, several scaling-factor parameters of a fuzzy controller can be determined efficiently so that the designed fuzzy controller can satisfy the specifications. The proposed inverter system cannot only supply loads with real power but also feed excess power to the utility (grid-connection mode), or can supply loads exclusively (stand-alone mode). In this paper, simulation results have verified the feasibility of the proposed control scheme and hardware results obtained from a system with a 16-bit single chip microcontroller (Intel 80196MC) are also presented to verify the theoretical discussions.
PERFORMANCE OF A SINGLE-SIDED LINEAR INDUCTION MOTOR WITH SOLID BACK IRON AND WITH VARIOUS MISALIGNMENTS. PHASE II- VOLUME 1

A test facility was designed and built to measure all aspects of the performance of a single-sided high-speed linear induction motor with solid back iron over a wide range of frequency, speed, and excitation. The facility was equipped and instrumented to measure all the usual performance parameters plus all of the six-axis forces in normal operation and, when displaced, in the remaining five degrees of freedom (air gap, lateral, pitch, roll, and yaw). Performance in the normal position was compared to the mesh/matrix prediction. Generally good agreement was obtained between measured and predicted values of thrust and efficiency. Differences between predicted and measured thrust (especially at high slips) were related to the solid back iron and skin saturation. Agreement between predicted and measured normal forces was not satisfactory. The six-axis force measuring system was thoroughly analyzed to determine the range of validity of the measurements and the errors inherent in using a sector motor to simulate a flat linear motor.
Dynamics and robust control of underwater vehicles for depth trajectory following

This paper addresses the robust control synthesis of diving/climbing manoeuvres for underwater vehicle in the vertical plane. First, a new state–space representation for the vehicle dynamics is presented, and the corresponding problem formulation is clearly stated. Next, the two-controller set-up using a H∞-loop shaping design is employed to deal with the bottom following capability and robustness issues. Then the reduced order control system with a Hankel norm is evaluated in the frequency domain. In addition, the preview control approach is used to improve the overall tracking performance for undersea manoeuvres. The specific control tasks include the tracking of a set of depth profiles or ocean floors. Simulation results show that control objectives are effectively accomplished in spite of model uncertainties. Finally, it is found that the proposed control methodology is suitable for the depth trajectory following applications over a wide range of operating conditions.
SKIN SEGMENTATION AND SKULL SEGMENTATION FOR MEDICAL IMAGING

In this paper aims we present tools for medical imaging applications to do skin and skull segmentation in a short time. The desired output for skin segmentation is a 3D visualization of the facial skin without any cavities or holes inside the head, while skull segmentation aims to create a 3D visualization of the skull bones. The algorithm used for skin segmentation is thresholding the image, extracting the largest connected component, and holefilling to fill the unnecessary holes. As for the skull segmentation, the process is done by removing the spines which is connected to the skull, and then extracting the largest connected component. Afterwards, mesh generation is done to produce the 3D objects from the processed images. This mesh generation process is done using the marching cubes algorithm. The testing results show that the skin and skull segmentation process will work well when there are no other objects that are connected to the skin or the skull. Skin segmentation process takes a significant amount of time, primarily caused by the holefilling process.
Using Natural Language Generation for Navigational Assistance

In this paper we tackle the problem of generating natural route descriptions on the basis of input obtained from a commercially available way-finding system. Our framework and architecture incorporates the use of generic natural language generation techniques. Through examples we demonstrate that it is possible to bridge the gap between underlying representation and natural sounding descriptions. The work presented contributes both to the area of natural language generation and to the improvement of way-finding system interfaces.
Wire‐Mesh Capacitance Tomography in Gas‐Liquid Flows

A new intrusive, wire‐mesh capacitance tomography for phase distributions in horizontal pipes is presented. A wire with an insulating film is used as a capacitor. The capacitance is in direct proportion to water film thickness, independent of water distribution and the salinity. We can obtain film thickness by measurement of capacitance. The sensor consists of four parallel wire capacitors, vertically placed over the cross section of the pipe. The interface is the result of linking the discrete film thicknesses with smooth curve, which are the tomographic result only when both phases are continuous. Static and dynamic experiments were carried out in air‐water two‐phase flows in horizontal pipes, from which we analyze the disturbance factors of the sensor to the flow field and measurement error of film thickness. The experimental results show that the tomographic results are consistent with expectation. The method has several advantages of no reconstructed algorithms, high signal‐to‐noise ratio, high sensi.
AFSATCOM Life Cycle Cost Model

Abstract : A Life Cycle Cost (LCC) mathematical model has been developed for the Air Force Satellite Communications System (AFSATCOM). The model (under FORTRAN program name SITELCC) has been used in various tradeoff analyses involving acquisition costs, operation and support costs, and system performance. The AFSATCOM LCC Model provides for three echelons of maintenance, for communications terminal configurations of black boxes which may differ from base to base, and for reliability data which is a function of operating environment. In addition to LCC, the model calculates terminal availability as a result of initial sparing levels computed. This report presents the detailed structure of the model. A description of the output reports with illustration from a sample model run is included. (Author)
High reliability non-hermetic 0.15 /spl mu/m GaAs pseudomorphic HEMT MMIC amplifiers

High reliability performance of a Ka-band low-noise MMIC amplifier fabricated using a 0.15 /spl mu/m production AlGaAs-InGaAs-GaAs HEMT process technology is reported. Operating at an accelerated DC bias condition of Vds=5.2 V and Ids=250 mA/mm, two-stage balanced amplifiers were lifetested at three-temperatures (T/sub ambient/=235/spl deg/C, T/sub ambient/=250/spl deg/C, and T/sub ambient/=265/spl deg/C) in air ambient. Failure time for each temperature was determined using /spl Delta/S21=-1.0 dB measured at room temperature as the failure criteria. The activation energy (Ea) is 1.6 eV, achieving a projected median-time-to-failure (MTF) of 7/spl times/10/sup 9/ hours at a 125/spl deg/C junction temperature. This is the first report of 0.15 /spl mu/m HEMT reliability based on S21 failure criteria of MMIC amplifiers under DC stress at high junction temperature in air ambient. This result demonstrates a robust HEMT technology immune to the stress effects of high electric field under high temperature operation suitable for non-hermetic commercial Ka-band applications.
On the Identification of Machine Settings for Gear Surface Topography Corrections

In this paper we set out to investigate the performances of some of the algorithms proposed in the gear literature for identifying the machine-settings required to obtain predesigned gear tooth surface topographies, or needed to compensate for flank form deviations of real teeth. For the ease of comparison, the problem is formulated as a nonlinear least-squares minimization, and the most widely employed algorithms are derived as particular cases. The algorithms included in the analysis are: (i) one-step methods; (ii) iterative methods; (iii) iterative methods with step control. The performance index is devised in their ability of returning practical solutions in the presence of: (i) strong model nonlinearities, (ii) ill-conditioning of the sensitivity matrix, (iii) demanding topographic shapes purposely selected. Instrumental here is an original classification of topographic modifications as either “simple” or “complex”, based on the SVD analysis of the sensitivity matrix. On the basis of the numerical tests documented, iterative techniques with step control seem the most convenient, due to reliability and robustness of the solutions produced. The generation process here considered is face-milling of hypoid gears, even though the methodology is general enough to cope with any gear cutting method requiring only some minor technical changes.Copyright © 2011 by ASME
Identification of rotor position and speed of standard induction motors at low speed including zero stator frequency

The total leakage inductance as seen from the stator windings of standard induction motors varies with the rotor position angle. The effect is exploited to extract the rotor position, and speed, from measured stator voltages. The extraction algorithm is incorporated based on a modification of the pulsewidth modulator. Experimental results demonstrate accurate position measurement at high resolution and high bandwidth at any speed including standstill. Preliminary results of a sensorless vector controlled AC drive system are presented.
Indoor location for safety application using wireless networks

This paper presents the indoor positioning research activities carried out within the scope of the Liaison project. Most of the work has been performed on WiFi location. WiFi is nowadays widely deployed in buildings such as hotels, hospitals, airports, train stations, public buildings, etc. Using this infrastructure to locate terminals connected to the wireless LAN is expected to have a low cost. Methods presented in this paper include fingerprinting with particle filter constrained on a Voronoi diagram and TOA based on data frames and acknowledgments at the IEEE 802.11 MAC level. Other technologies have also been researched: A-GNSS to handle the transition between outdoors and indoors, UWB in ad-hoc mode to cope with possible lacks of infrastructure and inertial MEMS to increase the availability and robustness of the overall system.
Events Management: An International Approach

Written by a team of twenty-five high profile, international authors, this exciting new text successfully combines theory and practice, making it a must-have for all students of Events Management.Events Management: An International Approach provides comprehensive coverage of all the most common types of events, preparing students for a future career in Events Management. Covering key issues such as fundraising, sponsorship, globalization and sustainability, this text addresses the challenges and examines the realities of events management in an international context. A wide range of case studies and examples look at sporting, music, catering and fundraising events across Europe, Africa, Asia, Australia and North America.Key features include:• An international approach, drawing on a wide range of cases from around the world• Extensive pedagogical features such as Diary of an Event Manager and Exercises in Critical Thinking• A companion website offering a full Instructor's Manual, PowerPoint slides, additional case studies and links to SAGE journal articlesThis book is essential reading for all undergraduate and postgraduate students studying Events Management.Nicole Ferdinand is Senior Lecturer in Events Management at the London Metropolitan Business School.Paul J. Kitchin is Lecturer in Sports Management at the University of Ulster.
Gender differences affecting the relationship between sleep attitudes, sleep behaviors and sleep outcomes

Abstract Research has found that discrepancies exist in many health-related behaviors, leading to discrepancies in health outcomes, between men and women. Among these, women tend to have more positive attitudes towards sleep and better sleep hygiene practices despite often having poorer sleep quality and insufficient sleep duration. The present study operationalized sleep hygiene as multi-faceted behaviors rather than a unitary construct. Using the PROCESS macro, we analyzed whether an interaction exists between gender and sleep attitudes to predict sleep hygiene, if sleep hygiene mediated the relationship between sleep attitudes and sleep outcomes, and if this indirect relationship is moderated by gender. Within our sample, gender moderated sleep attitudes predicting environment- and eating-related sleep hygiene behaviors. Sleep quality was indirectly predicted by sleep attitudes via pre-sleep arousal-related sleep hygiene behaviors. Additionally, gender moderated the indirect relationship between sleep attitudes and sleep quality through environment-related sleep hygiene behaviors. These findings reinforce the relevance of studying sleep attitudes in combination with demographic characteristics as predictors of sleep outcomes, and the usefulness of conceptualizing sleep hygiene as separable factors. It may help inform development of potential interventions intended to improve sleep and suggest directions for future studies.
Municipal solid waste management in Port Harcourt, Nigeria

Until recently, Port Harcourt was known as the “garden city of Nigeria” because of its neatness and the overwhelming presence of vegetation and flowers all over the metropolis. But today, the presence of piles of refuse dotting the entire city may have turned Port Harcourt rather to a “garbage city”. Indiscriminate dumping of wastes – industrial, commercial and household – such as food waste, paper, polyethene, textiles, scrap metals, glasses, wood, plastic, etc. at street corners and gutters, is still very common. The situation is so bad that traffic flow is obstructed, while there is likelihood that leachates from such dumps, after mixing with rain water, have the potential to contaminate drinking water. The basic solid waste management processes of collection, transport, segregation and final disposal appear to be very inefficient. This research carefully assessed the present system of solid waste management in Port Harcourt, with the aim of identifying the main bottlenecks to its efficiency and the way forward. The subject matter of solid waste management is the main object of discussion throughout this article.
Multiple-vehicle resource-constrained navigation in the deep ocean

Abstract : This thesis discusses sensor management methods for multiple-vehicle fleets of autonomous underwater vehicles, which will allow for more efficient and capable infrastructure in marine science, industry, and naval applications. Navigation for fleets of vehicles in the ocean presents a large challenge, as GPS is not available underwater and dead-reckoning based on inertial or bottom-lock methods can require expensive sensors and suffers from drift. Due to zero drift, acoustic navigation methods are attractive as replacements or supplements to dead-reckoning, and centralized systems such as an Ultra-Short Baseline Sonar (USBL) allow for small and economical components onboard the individual vehicles. Motivated by subsea equipment delivery we present model-scale proof-of-concept experimental pool tests of a prototype Vertical Glider Robot (VGR), a vehicle designed for such a system. Due to fundamental physical limitations of the underwater acoustic channel, a sensor such as the USBL is limited in its ability to track multiple targets at best a small subset of the entire fleet may be observed at once, at a low update rate. Navigation updates are thus a limited resource and must be efficiently allocated amongst the fleet in a manner that balances the exploration versus exploitation tradeoff. The multiple vehicle tracking problem is formulated in the Restless Multi-Armed Bandit structure following the approach of Whittle in [108], and we investigate in detail the Restless Bandit Kalman Filters priority index algorithm given by Le Ny et al. in [71]. We compare round-robin and greedy heuristic approaches with the Restless Bandit approach in computational experiments. For the subsea equipment delivery example of homogeneous vehicles with depth-varying parameters, a suboptimal quasi-static approximation of the index algorithm balances low landing error with safety and robustness.
Multicriteria Mission Route Planning Using A Parallel A* Search.

Abstract : The Mission Route Planning (MRP) Problem falls into the general class of multicriteria path search problems. Multiple criteria are evaluated to select an optimal aircraft mission route through a hostile environment. Criteria for distance travelled and radar exposure are combined into a single cost function for route evaluation. Radar calculations are performed dynamically. The A* search algorithm is applied to the MRP problem, and a parallel implementation is developed and tested. A unique combination of distributed OPEN lists with a global CLOSED list strategy produced fast execution times on the Paragon. Test cases for scenarios with 15 radars took less than 5 minutes with 16 processors. Measured performance is far superior to previous efforts.
Tackling Acceptability Issues in Communities of Practice by Providing a Lightweight Email-based Interface to eLogbook: a Web 2.0 Collaborative Activity and Asset Management System

eLogbook is a Web-based collaborative environment designed for communities of practice. It enables users to manage joint activities, share related assets and get contextual awareness. In addition to the original Web- based access, an email-based eLogbook interface is under development. The purpose of this lightweight interface is twofold. First, it eases eLogbook access when using smart phones or PDA. Second, it eases eLogbook acceptance for community members hesitating to learn an additional Web environment. Thanks to the proposed interface, members of a community can benefit from the ease of use of an email client combined with the power of an activity and asset management system without burden. The Web-based eLogbook access can be kept for supporting further community evolutions, when participation becomes more regular and activities become more complex. This paper presents the motivation, the design and the incentives of the email-based eLogbook interface.
Relational Contracting for Construction Excellence: Principles, Practices and Case Studies

Taylor and Francis RCME_A_488268. sgm 10.1080/01 46193 2010.488268 Const uction Manage ent and Economics 0144-6193 (pri t)/1466-433x (online) B ok Review 2 10 & Francis 0 002 0 Dr Sai-OnCheung bcs c@ ityu. du.hk Relational Contracting for Construction Excellence: Principles, Practices and Case Studies Albert P. Chan, Daniel W. Chan and John F. Yeung, Spon Press, Abingdon, 2010, 269 pp., ISBN 978-0415-46669-1, £80
Validation of field-to-transmission line coupling models

This paper presents experimental validations of field-to-transmission line coupling models using EMP simulators. Several configurations have been considered such as single-wire lines, multiconductor lines, and ramified lines above a conducting ground plane. All these structures were terminated in different ways (open circuit, short circuit, matched). Comparisons between calculations using transmission line theory and experimental measurements are presented and discussed. In general, agreement between numerical calculations and measurements is found to be reasonably good and validate the coupling models widely used today by the EMC community.