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Subject = Electrical and Electronics;
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Displaying Results 1 - 25 of 180 on page 1 of 8
Marked
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15 Ways to Save Energy
(2013)
Macrae, Iain
15 Ways to Save Energy
(2013)
Macrae, Iain
Abstract:
CIBSE & SLL International Lighting Conference
https://arrow.dit.ie/litcon/2013/april13/5
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A Comparison of Studies Conducted in Wales and Ireland on Issues Affecting Uptake of Micro-Generation Training
(2009)
Harrison, Alan; Irvine, SJC; O’Farrell, K; Stafford, A; Woolmington, Thomas
A Comparison of Studies Conducted in Wales and Ireland on Issues Affecting Uptake of Micro-Generation Training
(2009)
Harrison, Alan; Irvine, SJC; O’Farrell, K; Stafford, A; Woolmington, Thomas
Abstract:
In 2007 Irvine and Stafford [1] surveyed the attitude to the need for enhanced renewable education within groups of Electricians, Architects and Chemists in Wales. Similar groups were surveyed in Ireland in 2008. In comparing the attitudes of students in these two countries the principal differences are governmental support for microgeneration, the quantity of installed microgeneration and the year of the survey. The two countries are broadly similar in terms of geography, climate, population size, ethnicity, broadcast media, educational achievements, economy and income spread. In Ireland there is greater support for governmental intervention and for increased levels of installation. This could be a reaction to the very low level of activity that prevails in Ireland. The rapid changes during 2008 in economic outlook and in Climate Change consensus may have impacted on the responses. In many areas addressed in the survey the disciplines adopted a consensus position that superseded th...
https://arrow.dit.ie/engscheleart/175
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A Different Type of Lighting Research: a Qualitative Methodology
(2016)
Kelly, Kevin
A Different Type of Lighting Research: a Qualitative Methodology
(2016)
Kelly, Kevin
Abstract:
As lighting researchers we can learn from our colleagues in the humanities who have progressed Qualitative Research methods to a high level of rigour. We should consider using Qualitative Research Methods more. Such methods allow exploration of complex issues involving human behaviour and facilitate researchers to address difficult to answer questions that otherwise go unanswered. Good quality Qualitative Research can provide rich explanations of what went on in a given situation. Validity and Reliability are considered differently with this type of research methodology. This paper attempts to identify when qualitative research is appropriate, what questions it can answer in lighting research, how it is done, list the features and provide a simple brief example of a post occupancy evaluation case study. It is argued that qualitative research can be used with quantitative research; before quantitative research to inform it or afterwards to explain it; but it can also be extremely inf...
https://arrow.dit.ie/engscheleart2/105
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Mark
A Hardware One-Time Pad Prototype Generator for Localising Cloud Security
(2017)
Tobin, Paul; Tobin, Lee; mcKeever, Michael; Blackledge, Jonathan, Professor
A Hardware One-Time Pad Prototype Generator for Localising Cloud Security
(2017)
Tobin, Paul; Tobin, Lee; mcKeever, Michael; Blackledge, Jonathan, Professor
Abstract:
In this paper, we examine a system for encrypting data before storing in the Cloud. Adopting this system gives excellent security to stored data and complete control for accessing data by the client at different locations. The motivation for developing this personal encryption came about because of poor Cloud security and doubts over the safety of public encryption algorithms which might contain backdoors. However, side-channel attacks and other unwanted third-party interventions in Cloud security, probably contribute more to the poor security record history. These factors led to the development of a prototype for personalising security locally which defeats cryptanalysis. The key distribution problem associated with random binary sequences called one-time-pads, does not exist for one-to-Cloud applications, unlike bi-directional communications where it was a big issue. The random binary sequences were generated from chaotic analogue oscillators with initial conditions from a data re...
https://arrow.dit.ie/engscheleart/253
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Mark
A Mobile ECG Monitoring System with Context Collection
(2008)
Li, Jin Peng
A Mobile ECG Monitoring System with Context Collection
(2008)
Li, Jin Peng
Abstract:
An objective of a health process is one where patients can stay healthy with the support of expert medical advice when they need it, at any location and any time. An associated aim would be the development of a system which places increased emphasis on preventative measures as a first point of contact with the patient. This research is a step along the road towards this type of preventative healthcare for cardiac patients. It seeks to develop a smart mobile ECG monitoring system that requests and records context information about what is happening around the subject when an arrhythmia event occurs. Context information about the subject’s activities of daily living will, it is hoped, provide an enriched data set for clinicians and so improve clinical decision making. As a first step towards a mobile cardiac wellness guidelines system, the focus of this work is to develop a system that can receive bio-signals wirelessly, analyzing and storing the bio-signal in a handheld device and ca...
https://arrow.dit.ie/engmas/32
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A New Placement and Integration Method of UPQC to Improve the Power Quality in DG Network
(2013)
Khadem, Shafiuzzaman K.; Basu, Malabika; Conlon, Michael
A New Placement and Integration Method of UPQC to Improve the Power Quality in DG Network
(2013)
Khadem, Shafiuzzaman K.; Basu, Malabika; Conlon, Michael
Abstract:
A new proposal for the placement and integration of UPQC in DG connected microgrid/micro generation (μG) system has been presented here. DG converters (with storage), the load and shunt part of the UPQC will be placed at or after the PCC. The series part of the UPQC will be placed before the PCC and in series with the grid. DC link can be connected to the storage system also. Hence, it is termed UPQCμG. The advantages of the proposed UPQCμG over the normal UPQC are to compensate voltage interruptions in addition to voltage sags / swells, harmonic and reactive power compensation in the interconnected mode. The DG Converter with storage will supply the active power only and the shunt part of the UPQC will compensate the reactive and harmonic power of the load in the islanding mode. Therefore, the system can work both in interconnected and islanded mode. DG Converter does not require to be disconnected during the voltage disturbance. In all conditions, DG Converter will only provide th...
https://arrow.dit.ie/engscheleart/217
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A Novel Framework for Radio Resource Management in IEEE 802.11 Wireless LANs
(2005)
Davis, Mark; Raimondi, Tristan
A Novel Framework for Radio Resource Management in IEEE 802.11 Wireless LANs
(2005)
Davis, Mark; Raimondi, Tristan
Abstract:
In this paper we address the need to characterize and quantify resource usage in IEEE 802.11 WLANs in order to support radio resource management. We present a compact and intuitive framework for performance characterization and resource utilization that is based upon the concept of MAC bandwidth components. These MAC bandwidth components are directly related to the transmission rate and serve to quantify the resource requirements associated with accessing the wireless medium. We also introduce a graphical technique for presenting these MAC bandwidth components that illustrates how WLAN stations interact in contending for access to the wireless medium. We demonstrate the usefulness of this framework for radio resource management using a number of computer simulations based upon the emerging IEEE 802.11e QoS standard.
https://arrow.dit.ie/commcon/28
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A Novel QoS-Aware MPEG-4 Video Delivery Algorithm over the Lossy IEEE 802.11 WLANs to Improve the Video Quality
(2012)
Debnath, Tanmoy
A Novel QoS-Aware MPEG-4 Video Delivery Algorithm over the Lossy IEEE 802.11 WLANs to Improve the Video Quality
(2012)
Debnath, Tanmoy
Abstract:
Video traffic is bursty in nature and has different network requirements compared to other types of traffic (e.g. voice, data) in terms of bandwidth, delay, jitter, and loss etc. So it becomes important to manage video traffic on a WLAN carefully to achieve acceptable levels of Quality of Service (QoS). The unique contribution of this work is that it presents experimental and simulation studies of the performance of real video content streamed over WLAN networks. Under various test scenarios the performance of the WLAN network in terms of delay, loss, throughput etc. is analysed in the presence of background traffic. The effects of different types of server configurations and access contention between stations are also investigated for IEEE 802.11b and IEEE 802.11e networks. This work specifically considers the IPB fame based nature of MPEG- 4 encoded video. A novel QoS aware MPEG-4 video delivery algorithm is proposed and evaluated using a computer model written in the C programmin...
https://arrow.dit.ie/engdoc/43
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A Remote Capacity Utilization Estimator for WLANs
(2014)
Ding, Yi
A Remote Capacity Utilization Estimator for WLANs
(2014)
Ding, Yi
Abstract:
In WLANs, the capacity of a node is not fixed and can vary dramatically due to the shared nature of the medium under the IEEE 802.11 MAC mechanism. There are two main methods of capacity estimation in WLANs: Active methods based upon probing packets that consume the bandwidth of the channel and do not scale well. Passive methods based upon analyzing the transmitted packets that avoid the overhead of transmitting probe packets and perform with greater accuracy. Furthermore, passive methods can be implemented locally or remotely. Local passive methods require an additional dissemination mechanism in order to communicate the capacity information to other network nodes which adds complexity and can be unreliable under adverse network conditions. On the other hand, remote passive methods do not require a dissemination mechanism and so can be simpler to implement and also do not suffer from communication reliability issues. Many applications (e.g. ANDSF etc) can benefit from utilizing thi...
https://arrow.dit.ie/engdoc/68
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A Review of Parallel Operation of Active Power Filters in the Distributed Generation System
(2011)
Khadem, Shafiuzzaman Khan; Basu, Malabika; Conlon, Michael
A Review of Parallel Operation of Active Power Filters in the Distributed Generation System
(2011)
Khadem, Shafiuzzaman Khan; Basu, Malabika; Conlon, Michael
Abstract:
In this paper a technical review of parallel operation of Active Power Filter (APF) for harmonic power compensation in distributed generation (DG) network has been presented. Controlling methods and connection topologies with their pros and cons are described. Recent improvements in controlling and future trends for the application of APFs in distributed mode are also identified.
https://arrow.dit.ie/engscheleart/168
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A Silica Single-Mode Fibre-Chalcogenide Multimode Fibre-Silica Single-Mode Fibre Structure
(2012)
Wang, Pengfei; Ding, Ming; Bo, Lin; Semenova, Yuliya; wu, Qiang; Farrell, Gerald
A Silica Single-Mode Fibre-Chalcogenide Multimode Fibre-Silica Single-Mode Fibre Structure
(2012)
Wang, Pengfei; Ding, Ming; Bo, Lin; Semenova, Yuliya; wu, Qiang; Farrell, Gerald
Abstract:
In this letter we theoretically and experimentally investigate a single-mode-multimode-single-mode (SMS) structure based on chalcogenide (As2S3) multimode fibre and silica single-mode fibres. The experimental results show a general agreement with the numerical simulation results based on a wide angle-beam propagation method (WA-BPM). Multimode interference variation was observed as a result of photo-induced refractive index changes arising from either localized laser irradiation at a wavelength of 405 nm or the use of a UV lamp. Our result provides a platform for the development
https://arrow.dit.ie/engscheceart/138
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A Study of Integrated UWB Antennas Optimised for Time Domain Performance
(2012)
Dumoulin, Antoine
A Study of Integrated UWB Antennas Optimised for Time Domain Performance
(2012)
Dumoulin, Antoine
Abstract:
Antennas for impulse radio ultra-wideband based portable devices are required to be compact and able to transmit or receive waveforms with minimal distortion in order to support proximity ranging with a centimetre-scale precision. The first part of thesis characterises several pulse types for use in the generation of picosecond-scale signals in respect to the regulatory power and frequency standards while the principles of antenna transient transmission and reception are stated. The proximity effect of planar conductors on the performance of an ultra-wideband antenna is investigated in both spectral and temporal domain demonstrating the relationship between the antenna-reflector separation and the antenna performance. Balanced and unbalanced antennas are also investigated for integration into asset-tracking tag applications and are designed to operate in close proximity to PCB boards while meeting realistic dimensional constraints and acceptable time domain performances. Monopole an...
https://arrow.dit.ie/engdoc/44
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A Study on the Power Quality of DG Integrated Building Energy System in Virtual Environment
(2013)
Khadem, Shafiuzzaman K.; Kerrigan, Ruth; Basu, Malabika; Basu, Biswajit
A Study on the Power Quality of DG Integrated Building Energy System in Virtual Environment
(2013)
Khadem, Shafiuzzaman K.; Kerrigan, Ruth; Basu, Malabika; Basu, Biswajit
Abstract:
In this paper, the electrical energy demand of a typical residential building has been extracted from a Virtual Environment (VE) simulation. The extracted energy demand is generated by input load demand and hourly operating information. Based on the electrical energy demand for a typical day, a building integrated photovoltaic (PV) system is then simulated in MATLAB to extract the current/voltage disturbance information into the network. Outcome of this simulation shows the voltage/current waveform along with the disturbances at different locations in the building. The city of Dublin, Ireland has been chosen as a geographical location and VE-Pro software has been used to develop the virtual environment simulation for the building energy system. The simulation based on VE-Pro and MATLAB indicates the scope for possible placement of Custom Power Devices (CPDs) to improve the power quality of the DG integrated building energy system.
https://arrow.dit.ie/engscheleart/213
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A Techno-economical Appraisal of a PV Domestic Plant on a Irish Dwelling
(2016)
Sandano, Roberto
A Techno-economical Appraisal of a PV Domestic Plant on a Irish Dwelling
(2016)
Sandano, Roberto
Abstract:
A comprehensive study of a domestic PV installation is addressed in this paper. A series of economic results are presented for a domestic installation in Ireland.
https://arrow.dit.ie/engscheleart2/109
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A Two-Level Identity Model To Support Interoperability of Identity Information in Electronic Health Record Systems.
(2016)
Chen, Xu
A Two-Level Identity Model To Support Interoperability of Identity Information in Electronic Health Record Systems.
(2016)
Chen, Xu
Abstract:
The sharing and retrieval of health information for an electronic health record (EHR) across distributed systems involves a range of identified entities that are possible subjects of documentation (e.g., specimen, clinical analyser). Contemporary EHR specifications limit the types of entities that can be the subject of a record to health professionals and patients, thus limiting the use of two level models in healthcare information systems that contribute information to the EHR. The literature describes several information modelling approaches for EHRs, including so called “two level models”. These models differ in the amount of structure imposed on the information to be recorded, but they generally require the health documentation process for the EHR to focus exclusively on the patient as the subject of care and this definition is often a fixed one. In this thesis, the author introduces a new identity modelling approach to create a generalised reference model for sharing archetype-...
https://arrow.dit.ie/engdoc/87
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A Wireless and Digital Electrode Bus Topology for Biopotential Measurement
(2012)
Nolan, Mark; Burke, Edward; Coyle, Eugene
A Wireless and Digital Electrode Bus Topology for Biopotential Measurement
(2012)
Nolan, Mark; Burke, Edward; Coyle, Eugene
Abstract:
The conventional biopotential measurement configuration utilises long lead wires which connect measuring electrodes to signal conditioning circuitry. The majority of bioelectric signals that are measured from the human body have a tiny signal amplitude (5µV-5mV range) and thus any interference that is induced on the lead wires can have a detrimental effect on the original signal. In this paper, we present an alternative configuration, in which digitisation occurs on the electrode, potentially providing enhanced signal measurement as well as significant benefits in terms of the simplification of the physical interconnections between electrodes. Multiple electrodes are combined to form a digital electrode bus. This proposed topology represents the next stage in the evolution of bioelectric measurement as, due to the decrease in cost and size of integrated circuits, more of the bioinstrumentation circuitry is shifted away from a base measurement station and into the electrode itself. T...
https://arrow.dit.ie/teapotcon/28
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A Wireless Traffic Probe for Radio Resource Management and QoS Provisioning in IEEE 802.11 WLANs
(2004)
Davis, Mark
A Wireless Traffic Probe for Radio Resource Management and QoS Provisioning in IEEE 802.11 WLANs
(2004)
Davis, Mark
Abstract:
The emergence of real-time services such as voice over IP (VoIP) and video streaming imposes stringent requirements on the performance of a network if quality of service (QoS) targets are to be achieved. In the case of wireless networks, some form of radio resource management (RRM) is typically required to allocate the available resources among the contending stations in accordance with their needs and respective priorities. A critical aspect of any RRM scheme is the ability to monitor resource usage and to determine the resource requirements on a per-station basis. In this paper we describe a wireless traffic probe for IEEE 802.11 WLANs capable of obtaining this information and presenting it in a compact and intuitive format. The probe also shows how the wireless stations interact with one another in competing for the resources of the WLAN in a clear and quantifiable way. The results from the WLAN traffic probe obtained in a series of video streaming test scenarios are also present...
https://arrow.dit.ie/commcon/27
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Accelerated Aging Test on Multiple XLPE MV Cables Simultaneously to Induce Water Trees
(2015)
Conlan, Shane; Courtney, Jane; Looby, Tom
Accelerated Aging Test on Multiple XLPE MV Cables Simultaneously to Induce Water Trees
(2015)
Conlan, Shane; Courtney, Jane; Looby, Tom
Abstract:
The objective of this paper is to develop an accelerated ageing test to induce water tree growth which is capable of testing up to ten 10 kV cable samples simultaneously. An existing accelerated ageing method was used as a basis for this project. This method uses a high frequency power supply (3 kHz) to achieve a test duration of 14 days. Modifications were made to this method to allow for multiple samples to be tested simultaneously. A specially designed variable inductor was utilised in a parallel RLC resonance circuit. This resonance circuit limits the current draw from a high frequency high voltage transformer which allows for up to ten sample to undergo the test. Water trees were found in a number of the samples tested. The maximum length and quantity of water trees in each sample was recorded and analysed. A ranking system was used to grade how each cable preformed during the test. The method of using the parallel resonance circuit to limit the current was successful. The acce...
https://arrow.dit.ie/engscheleart/233
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Mark
Adaptive Environments for Enabling Senior Citizens: An Holistic Assessment Tool for Housing Design and IoT-based Technologies
(2016)
Zallio, Matteo; Berry, Damon; Casiddu, Niccolò
Adaptive Environments for Enabling Senior Citizens: An Holistic Assessment Tool for Housing Design and IoT-based Technologies
(2016)
Zallio, Matteo; Berry, Damon; Casiddu, Niccolò
Abstract:
The population of older adults will continuously increase over the coming decades. As they get older, people will require assistance and regular monitoring, with higher costs for welfare system and families. Two vital aspects of a healthy lifestyle, are domestic autonomy and maintenance of relationships within the neighborhood. This leads to an interesting research issue: “Could houses and appliances have the potential to improve autonomy and quality of life of citizens? Which methods and tools could enhance wellbeing and healthy conditions? The house has the potential to be a safe, adaptive environment, integrated with technologies for life support. This work seeks to investigate the key implications of architectural accessibility, interior Design features and interactive technologies, related to User Experience Design. The proposed Design approach called “Environment Design to Sustain Users” is based on a scenario composed of two empirical strategies. The reported research aims to...
https://arrow.dit.ie/engscheleart/244
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Advanced Circularly Polarised Microstrip Patch Antennas
(2013)
Narbudowicz, Adam Z.
Advanced Circularly Polarised Microstrip Patch Antennas
(2013)
Narbudowicz, Adam Z.
Abstract:
The thesis describes outcomes of research on advanced circularly polarised antennas. The proposed designs are intended for integration into small mobile devices, therefore low profile and easy manufacturability are key parameters, along with good CP radiation properties. The designs were validated by simulation and measurement, and are also backed by theory and design guidelines. The primary focus is on the development of planar omnidirectional circularly polarised antennas, which are fabricated using multilayer PCB techniques and thus are lightweight and cost-efficient. Unlike in classical microstrip patch antenna designs, the groundplane of the proposed antenna was substantially reduced. This helps to achieve an omnidirectional circular polarisation pattern and miniaturize the antenna, however at the cost of increased feed circuit complexity. The basic design, its advantages and disadvantages are discussed in Section 3. In the next step, the omnidirectional circularly polarised an...
https://arrow.dit.ie/engdoc/57
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An Assessment of the Audio Codec Performance in Voice over WLAN (VoWLAN) Systems
(2005)
Narbutt, Miroslaw; Davis, Mark
An Assessment of the Audio Codec Performance in Voice over WLAN (VoWLAN) Systems
(2005)
Narbutt, Miroslaw; Davis, Mark
Abstract:
In this paper we present results of experimental investigation into the performance of three audio codecs (ITU-T G.711, G.723.1 and G.729A) under varying load conditions on a Voice over WLAN system utilizing the IEEE 802.11b wireless LAN standard. The analysis is based upon a new technique for estimating user satisfaction of speech quality calculated from packet delay and packet loss/late measurements. We also demonstrate the importance of the de-jitter buffer playout scheme for insuring speech quality. From our results we conclude that the use of the G.711 audio codec in conjunction with the new adaptive playout scheme gives the highest user satisfaction of the Voice over WLAN schemes considered.
https://arrow.dit.ie/commcon/31
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An Evaluation of a Conservative Transmit Power Control Mechanism on an Indoor 802.11 Wireless Mesh Testbed
(2008)
Kowalik, Karol; Bykowski, Marek; Keegan, Brian; Davis, Mark
An Evaluation of a Conservative Transmit Power Control Mechanism on an Indoor 802.11 Wireless Mesh Testbed
(2008)
Kowalik, Karol; Bykowski, Marek; Keegan, Brian; Davis, Mark
Abstract:
Power control techniques for IEEE 802.11 wireless networks have already gained considerable attention. Such techniques are particularly attractive because they can improve various aspects of wireless network operation such as interference mitigation, spatial reuse in dense wireless deployments, topology control, and link quality enhancement. In this paper we propose a novel delivery ration based Conservative Transmit Power Control (ConTPC) mechanism. Our implementation is conservative when it comes to deciding if the transmit power should be reduced for a given link. This is because we do not want poor quality wireless links to further reduce their quality and be overwhelmed by other links transmitting at maximum power. We have experimentally evaluated the benefit of the proposed power control scheme when compared with fixed power level systems. We show that our ConTPC mechanism can increase the throughput, however the magnitude of this enhancement largely depends on the topology of...
https://arrow.dit.ie/commcon/7
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Mark
An explicit mapping between the frequency domain and the time domain representations of nonlinear systems
(2005)
Condon, Marissa; Ivanov, Rossen
An explicit mapping between the frequency domain and the time domain representations of nonlinear systems
(2005)
Condon, Marissa; Ivanov, Rossen
Abstract:
Explicit expressions are presented that describe the input-output behaviour of a nonlinear system in both the frequency and the time domain. The expressions are based on a set of coefficients that do not depend on the input to the system and are universal for a given system. The anharmonic oscillator is chosen as an example and is discussed for different choices of its physical parameters. It is shown that the typical approach for the determination of the Volterra Series representation is not valid for the important case when the nonlinear system exhibits oscillatory behaviour and the input has a pole at the origin (in the frequency domain), e.g. the unit-step function. For this case, resonant effects arise and the analysis requires additional care.
https://arrow.dit.ie/scschmatart/71
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An Investigation of the Correlation between Passive Monitoring and Activie Probing Techniques used in WLAN Mesh Networks
(2008)
Zhang, Chenzhe; Davis, Mark
An Investigation of the Correlation between Passive Monitoring and Activie Probing Techniques used in WLAN Mesh Networks
(2008)
Zhang, Chenzhe; Davis, Mark
Abstract:
In recent years, Wireless Mesh Networks (WMNs) have emerged as a promising solution to provide low cost networks that extend Internet access and other networking services. Mesh routers form the backbone connectivity through cooperative routing in an often unstable wireless medium. Therefore, the techniques used to monitor and manage the performance metrics to help optimize the link performance in WMNs. This paper presents an assessment of the correlation between passive monitoring and active probing techniques used for link performance measurement in WMNs. This paper presents an assessment of the correlation between passive monitoring and active probing techniques used for link performance measurement in WMNs. The study reveals that by combining multiple performance metrics obtained by using passive monitoring, a good correlation with active probing can be achieved. We then analyze the reaction of the passive monitoring and active probing techniques to variations in the network load...
https://arrow.dit.ie/commcon/10
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ANALYSIS OF A VARIABLE SPEED DOUBLE-FED INDUCTION GENERATOR WIND TURBINE DURING NETWORK VOLTAGE UNBALANCE CONDITIONS.
(2007)
Kearney, Joseph; Conlon, Michael
ANALYSIS OF A VARIABLE SPEED DOUBLE-FED INDUCTION GENERATOR WIND TURBINE DURING NETWORK VOLTAGE UNBALANCE CONDITIONS.
(2007)
Kearney, Joseph; Conlon, Michael
Abstract:
The behaviour of Double-Fed Induction Generators to supply network voltage unbalance is investigated. The paper shows the effects that voltage unbalance can have on a DFIG, using Matlab/Simulink. The results from simulations show that voltage unbalance affects both the induction generator and the rotor converter, due to the high unbalanced currents generated. The ability to modify the control strategy of a DFIG to compensate for voltage unbalance is outlined and simulations show the improvements to the performance of the DFIG.
https://arrow.dit.ie/engscheleart/219
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