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Subject = Computer networks;
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Displaying Results 1 - 25 of 99 on page 1 of 4
Marked
Mark
A cross-layer quality-oriented energy-efficient scheme for multimedia delivery in wireless local area networks
(2014)
Song, Yang
A cross-layer quality-oriented energy-efficient scheme for multimedia delivery in wireless local area networks
(2014)
Song, Yang
Abstract:
Wireless communication technologies, although emerged only a few decades ago, have grown fast in both popularity and technical maturity. As a result, mobile devices such as Personal Digital Assistants (PDA) or smart phones equipped with embedded wireless cards have seen remarkable growth in popularity and are quickly becoming one of the most widely used communication tools. This is mainly determined by the flexibility, convenience and relatively low costs associated with these devices and wireless communications. Multimedia applications have become by far one of the most popular applications among mobile users. However this type of application has very high bandwidth requirements, seriously restricting the usage of portable devices. Moreover, the wireless technology involves increased energy consumption and consequently puts huge pressure on the limited battery capacity which presents many design challenges in the context of battery powered devices. As a consequence, power managemen...
http://doras.dcu.ie/19760/
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A discrete simulation model for heterogeneous traffic including bicycles on urban road networks
(2014)
Vasic, Jelena
A discrete simulation model for heterogeneous traffic including bicycles on urban road networks
(2014)
Vasic, Jelena
Abstract:
Environment and health-related concerns mean that pedal-bicycles as an alternative mode of urban transport are gaining ground, with study of motorised/non-motorised traffic mix a topic of practical interest in transportation science and traffic modelling. This thesis reports on a simulation model, developed for heterogeneous traffic on city networks with AD HOC lane-sharing, characteristic of Dublin streets. While based on simple cellular automaton rules, the vehicle movement model also accounts for vehicle type heterogeneity and network-specific factors, including the resolution of conflicts and effects of driver decisions on movement dynamics. The model has been implemented as an agent-based simulation framework. Its spatial component is based on a modular design that facilitates straightforward scenario configuration and scalability. In order to perform large network simulations, the framework has been adapted for parallel processing. Issues of both static and dynamic load balanc...
http://doras.dcu.ie/19765/
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A flexible, abstract network optimisation framework and its application to telecommunications network design and configuration problems
(2001)
Murphy, Sean
A flexible, abstract network optimisation framework and its application to telecommunications network design and configuration problems
(2001)
Murphy, Sean
Abstract:
A flexible, generic network optimisation framework is described. The purpose of this framework is to reduce the effort required to solve particular network optimisation problems. The essential idea behind the framework is to develop a generic network optimisation problem to which many network optimisation problems can be mapped. A number of approaches to solve this generic problem can then be developed. To solve some specific network design or configuration problem the specific problem is mapped to the generic problem and one of the problem solvers is used to obtain a solution. This solution is then mapped back to the specific problem domain. Using the framework in this way, a network optimisation problem can be solved using less effort than modelling the problem and developing some algorithm to solve the model. The use of the framework is illustrated in two separate problems: design of an enterprise network to accommodate voice and data traffic and configuration of a core diffserv...
http://doras.dcu.ie/19124/
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A multi-modal event detection system for river and coastal marine monitoring applications
(2011)
O'Connor, Edel; Smeaton, Alan F.; O'Connor, Noel E.
A multi-modal event detection system for river and coastal marine monitoring applications
(2011)
O'Connor, Edel; Smeaton, Alan F.; O'Connor, Noel E.
Abstract:
Abstract—This work is investigating the use of a multi-modal sensor network where visual sensors such as cameras and satellite imagers, along with context information can be used to complement and enhance the usefulness of a traditional in-situ sensor network in measuring and tracking some feature of a river or coastal location. This paper focuses on our work in relation to the use of an off the shelf camera as part of a multi-modal sensor network for monitoring a river environment. It outlines our results in relation to the estimation of water level using a visual sensor. It also outlines the benefits of a multi-modal sensor network for marine environmental monitoring and how this can lead to a smarter, more efficient sensing network.
http://doras.dcu.ie/16798/
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A performance model of a telecommunications network structured according to intelligent network principles
(1997)
Newcombe, A. G
A performance model of a telecommunications network structured according to intelligent network principles
(1997)
Newcombe, A. G
Abstract:
The Intelligent Network (IN) is an telecommunications services architecture which enables the rapid creation and deployment of supplementary telecommunications services. However, this flexibility makes the management of the network performance critical in ensuring that customers receive their expected Quality of Service. This thesis describes a model which has been developed to predict the delays in the network due to IN-specific service processing. The model proposed is a queuing network which builds on the existing state of the art as follows. The characteristics of the flows between the IN physical entities are considered and general service time distributions are assumed at each entity. Additionally, the model allows the reservation of capacities as the SCP for each service type. An analytic formulation was developed using the decomposition approximate method. The model was also simulated in order to ascertain its’ accuracy. The results of the analytic solution and the simulat...
http://doras.dcu.ie/19138/
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A practical assessment of network orientated load control for the intelligent network
(2003)
Wathan, Navinder Singh
A practical assessment of network orientated load control for the intelligent network
(2003)
Wathan, Navinder Singh
Abstract:
The purpose of this thesis is to assess a new method of controlling load in Intelligent Networks (INs). This will be done through the analysis of experimentation results and comparison with existing methods of IN load control. This exercise will result in the investigation and validation of the proposed benefits being offered by this new methodology and the unveiling of its disadvantages. The methodology is known as network-orientated load control for the IN. Network-orientated load control is demonstrated using the MARINER Service Traffic Load Control System developed by the European Commission’s Advanced Communication, Technologies and Services (ACTS) Multi-Agent Architecture for Distributed Intelligent Network Load Control and Overload Protection (MARINER) Project. This system is shown to be a network-orientated load control application operating at the service level, built specifically for Intelligent Networks. Network-orientated load control is then assessed by deploying the ...
http://doras.dcu.ie/18272/
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A reputation and trust based multi-modal sensor network for environmental monitoring
(2010)
O'Connor, Edel; Smeaton, Alan F.; O'Connor, Noel E.
A reputation and trust based multi-modal sensor network for environmental monitoring
(2010)
O'Connor, Edel; Smeaton, Alan F.; O'Connor, Noel E.
Abstract:
Water management is an important part of monitoring the natural environment and includes monitoring water quality of both coastal and inland marine locations. This covers the detection of pollution and monitoring the development of harmful algal blooms as well as coastal features and wave patterns. For many years water managers relied on field measurements for coastal monitoring and water quality evaluation. This type of sampling is quite limited on both temporal and spatial scales and is ineffective for capturing dynamic marine events, essential for increased knowledge and better decision making. It also involves costly, time and labour-intensive on-site sampling and data collection. The introduction of new policies such as the EU Water Framework Directive has increased pressure on governments to adopt new methods for continuous monitoring of all water bodies. In recent years, the use of in-situ wireless sensor networks (WSNs) for marine environmental monitoring has been developin...
http://doras.dcu.ie/15316/
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A review of connection admission control algorithms for ATM networks
(2002)
Curran, Maureen
A review of connection admission control algorithms for ATM networks
(2002)
Curran, Maureen
Abstract:
The emergence of high-speed networks such as those with ATM integrates large numbers of services with a wide range of characteristics. Admission control is a prime instrument for controlling congestion in the network. As part of connection services to an ATM system, the Connection Admission Control (CAC) algorithm decides if another call or connection can be admitted to the Broadband Network. The main task of the CAC is to ensure that the broadband resources will not saturate or overflow within a very small probability. It limits the connections and guarantees Quality of Service for the new connection. The algorithm for connection admission is crucial in determining bandwidth utilisation efficiency. With statistical multiplexing more calls can be allocated on a network link, while still maintaining the Quality of Service specified by the connection with traffic parameters and type of service. A number of algorithms for admission control for Broadband Services with ATM Networks are ...
http://doras.dcu.ie/17353/
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A route identification algorithm for assisted living applications fusing WLAN, GPS and image matching data
(2010)
Redzic, Milan; Brennan, Conor; O'Connor, Noel E.
A route identification algorithm for assisted living applications fusing WLAN, GPS and image matching data
(2010)
Redzic, Milan; Brennan, Conor; O'Connor, Noel E.
Abstract:
This paper addresses the automatic identification of often traversedroutes for assisted living applications using WLAN technology in addition to other modalities. This problem is complicated by a number of factors, including the changing and noisy nature of the WLAN channel, the need to track users seamlessly in both indoor and outdoor environments, the need for robustness to slight deviations in the precise path taken, and speed, along a route. In this work commonly traversed routes are identified by clustering based on sensed data, two of which take the form of wireless signals: GPS and WLAN. The latter is particularly important as it can be used both indoors and outdoors. In addition an efficient image matching algorithm is implemented to process data from images automatically taken along the route. In this work a finite number of routes were identified within the DCU campus. Each route was traversed many times over a period of 6 weeks and data sequences collected automatically o...
http://doras.dcu.ie/15322/
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A study of the origin and applications of nonlinear polarization rotation in semiconductor optical amplifiers
(2005)
Kennedy, Brendan F.
A study of the origin and applications of nonlinear polarization rotation in semiconductor optical amplifiers
(2005)
Kennedy, Brendan F.
Abstract:
In order to fully exploit the capacity of optical networks it is necessary to develop alloptical signal processing techniques. One device which can be used for this purpose is the Semiconductor Optical Amplifier (SOA). A lot of research has been devoted to this device. This work concentrates mainly on the nonlinearities in the device to perform alloptical processes such as switching and wavelength conversion. The main nonlinearities that have been considered are cross-phase modulation, cross-gain modulation and fourwave mixing. However, another type of nonlinearity has recently come to attention, which is due to the intensity dependent rotation in the state of polarization of a signal injected into the SOA. This phenomenon is called Nonlinear Polarization Rotation (NPR). The exact physical origin of this effect is yet to be determined. The physical origins behind the NPR effect are examined using several novel experimental techniques. Polarization dependence of the gain and birefri...
http://doras.dcu.ie/17961/
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A three-tier structured model of overlay networks
(2009)
Wu, Mei; Wu, Chanle; Collier, Martin
A three-tier structured model of overlay networks
(2009)
Wu, Mei; Wu, Chanle; Collier, Martin
Abstract:
One of the open research problems in the area of overlay networks is the creation of an adequate network topology and a proper network model. Current models mainly focus on traffic demands and loads between the nodes. However it is more challenging to find a model which supports scalability, adaptability and robustness in a heterogeneous environment. We introduce a new three-tier model based on regular-graph theory called STree and its two-stage joining mechanism. We compare STree with other models such as NICE, DTree and HMRB. Our results suggest that STree is a robust and scalable model for overlay networks in large, dynamic and heterogeneous environments.
http://doras.dcu.ie/15500/
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A Tree-based protocol for enforcing quotas in clouds
(2014)
Lakew, Ewnetu Bayuh; Xu, Lei; Hernandez-Rodriguez, Francisco ; Elmroth, Erik; Pahl, Claus
A Tree-based protocol for enforcing quotas in clouds
(2014)
Lakew, Ewnetu Bayuh; Xu, Lei; Hernandez-Rodriguez, Francisco ; Elmroth, Erik; Pahl, Claus
Abstract:
Services are increasingly being hosted on cloud nodes to enhance their performance and increase their availability. The virtually unlimited availability of cloud resources enables service owners to consume resources without quantitative restrictions, paying only for what they use. To avoid cost overruns, resource consumption must be controlled and capped when necessary. We present a distributed tree-based protocol for managing quotas in clouds that minimizes communication overheads and reduces the time required to determine whether a quota has been exhausted. Experimental evaluation shows that our protocol reduces communication costs by 42% relative to a distributed baseline solution and is up to 15 times faster.
http://doras.dcu.ie/19993/
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Adaptive buffer power save mechanism for mobile multimedia streaming
(2007)
Adams, Janet
Adaptive buffer power save mechanism for mobile multimedia streaming
(2007)
Adams, Janet
Abstract:
With the proliferation of wireless networks, the use of mobile devices to stream multimedia is growing in popularity. Although the devices are improving in that they are becoming smaller, more complex and capable of running more applications than ever before, there is one aspect of them that is lagging behind. Batteries have seen little development, even though they are one of the most important parts of the devices. Multimedia streaming puts extra pressure on batteries, causing them to discharge faster. This often means that streaming tasks can not be completed, resulting in significant user dissatisfaction. Consequently, effort is required to devise mechanisms to enable and increase in battery life while streaming multimedia. In this context, this thesis presents a novel algorithm to save power in mobile devices during the streaming of multimedia content. The proposed Adaptive-Buffer Power Save Mechanism (AB-PSM) controls how the data is sent over wireless networks, achieving sign...
http://doras.dcu.ie/95/
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An efficient hardware architecture for a neural network activation function generator
(2006)
Larkin, Daniel; Kinane, Andrew; Muresan, Valentin; O'Connor, Noel E.
An efficient hardware architecture for a neural network activation function generator
(2006)
Larkin, Daniel; Kinane, Andrew; Muresan, Valentin; O'Connor, Noel E.
Abstract:
This paper proposes an efficient hardware architecture for a function generator suitable for an artificial neural network (ANN). A spline-based approximation function is designed that provides a good trade-off between accuracy and silicon area, whilst also being inherently scalable and adaptable for numerous activation functions. This has been achieved by using a minimax polynomial and through optimal placement of the approximating polynomials based on the results of a genetic algorithm. The approximation error of the proposed method compares favourably to all related research in this field. Efficient hardware multiplication circuitry is used in the implementation, which reduces the area overhead and increases the throughput.
http://doras.dcu.ie/456/
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An investigation into intelligent network congestion control strategies
(2000)
Lodge, Fiona
An investigation into intelligent network congestion control strategies
(2000)
Lodge, Fiona
Abstract:
This thesis examines the congestion control issues that arise in Intelligent Networks, when it is necessary to support multiple service types with different load requirements and priorities. The area of Intelligent Network (IN) congestion control has been under investigation for over a decade, but in general, the models used in this research were over-simplified and all service types were assumed to have the same priority levels and load requirements at the various IN physical elements. However, as the IN is a dynamic network that must process many different service types that have radically different call load profiles and are based on different service level agreements and charging schemes, the validity of the above assumptions is questionable. The aim of this work, therefore, is to remove a number of the classic assumptions made in IN congestion control research, by: • developing a detailed model of an IN, catering for multiple traffic types, • using this model to establish the ...
http://doras.dcu.ie/18965/
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Automated murmurs: the social mobile tourist application
(2009)
Freyne, Jill; Brennan, Adam J.; Smyth, Barry; Byrne, Daragh; Smeaton, Alan F.; Jones, G...
Automated murmurs: the social mobile tourist application
(2009)
Freyne, Jill; Brennan, Adam J.; Smyth, Barry; Byrne, Daragh; Smeaton, Alan F.; Jones, Gareth J.F.
Abstract:
The popularity of mobile devices and their increased computing power has given rise to surge in mobile computing technologies. Users are increasingly turning to mobile devices for information relating to their activities and location while on the move. Independent of this, the world has seen a huge uptake in the social web, which has fueled the production of applications where users are the sole providers of valuable information. In this work we present a mobile platform which leverages the popularity of mobile and social computing to produce a location sensitive messaging system which delivers user generated content to the public in the context of their physical location.
http://doras.dcu.ie/15018/
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Automatic configuration of smart city applications for user-centric decision support
(2017)
Pham, Thu-Le; Germano, Stefano; Mileo, Alessandra; Kuemper , Daniel; Muhammad, Intizar Ali
Automatic configuration of smart city applications for user-centric decision support
(2017)
Pham, Thu-Le; Germano, Stefano; Mileo, Alessandra; Kuemper , Daniel; Muhammad, Intizar Ali
Abstract:
Smart city applications in the Big Data era require not only techniques dedicated to dynamicity handling, but also the ability to take into account contextual information, user preferences and requirements, and real-time events to provide optimal solutions and automatic configuration for the end user. In this paper, we present a specific functionality in the design and implementation of a declarative decision support component that exploits contextual information, user preferences and requirements to automatically provide optimal configurations of smart city applications. The key property of user-centricity of our approach is achieved by enabling users to declaratively specify constraints and preferences on the solutions provided by the smart city application through the Decision Support component, and automatically map these constraints and preferences to provide optimal responses targeting user needs. We showcase the effectiveness and flexibility of our solution in two real usecas...
http://doras.dcu.ie/21770/
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Bluetooth familiarity: methods of calculation, applications and limitations
(2007)
Lavelle, Barry; Byrne, Daragh; Gurrin, Cathal; Smeaton, Alan F.; Jones, Gareth J.F.
Bluetooth familiarity: methods of calculation, applications and limitations
(2007)
Lavelle, Barry; Byrne, Daragh; Gurrin, Cathal; Smeaton, Alan F.; Jones, Gareth J.F.
Abstract:
We present an approach for utilising a mobile device’s Bluetooth sensor to automatically identify social interactions and relationships between individuals in the real world. We show that a high degree of accuracy is achievable in the automatic identification of mobile devices of familiar individuals. This has implications for mobile device security, social networking and in context aware information access on a mobile device.
http://doras.dcu.ie/425/
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Branch Prediction For Network Processors
(2010)
Bermingham, David
Branch Prediction For Network Processors
(2010)
Bermingham, David
Abstract:
Originally designed to favour flexibility over packet processing performance, the future of the programmable network processor is challenged by the need to meet both increasing line rate as well as providing additional processing capabilities. To meet these requirements, trends within networking research has tended to focus on techniques such as offloading computation intensive tasks to dedicated hardware logic or through increased parallelism. While parallelism retains flexibility, challenges such as load-balancing limit its scope. On the other hand, hardware offloading allows complex algorithms to be implemented at high speed but sacrifice flexibility. To this end, the work in this thesis is focused on a more fundamental aspect of a network processor, the data-plane processing engine. Performing both system modelling and analysis of packet processing functions; the goal of this thesis is to identify and extract salient information regarding the performance of multi-processor workl...
http://doras.dcu.ie/15731/
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Building a context rich interface to low level sensor data
(2012)
Shi, Jie
Building a context rich interface to low level sensor data
(2012)
Shi, Jie
Abstract:
Sensor networks play an important role in our modern information society. These networks are used for a variety of activities in different domains, including traffic monitoring, environmental analysis, transport and personal health. In general, systems generate data in their own format with little or no associated semantics. As a result, data must be managed individually and significant human effort is required to analyze data and develop ad-hoc applications for different end-user requirements. The research presented here proposes a holistic and comprehensive approach to significantly reduce the human effort in analyzing networks of sensors. The goal is to facilitate any form of sensor network, enabling users to combine related semantics with sensor data, and facilitate the end-user transformation of data necessary to provide more complex query expressions, and thus meet the analytical requirements.
http://doras.dcu.ie/17445/
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Capturing personal health data from wearable sensors
(2008)
Camous, Fabrice; McCann, Dónall; Roantree, Mark
Capturing personal health data from wearable sensors
(2008)
Camous, Fabrice; McCann, Dónall; Roantree, Mark
Abstract:
Recently, there has been a significant growth in pervasive computing and ubiquitous sensing which strives to develop and deploy sensing technology all around us. We are also seeing the emergence of applications such as environmental and personal health monitoring to leverage data from a physical world. Most of the developments in this area have been concerned with either developing the sensing technologies, or the infrastructure (middleware) to gather this data and the issues which have been addressed include power consumption on the devices, security of data transmission, networking challenges in gathering and storing the data and fault tolerance in the event of network and/or device failure. Research is focusing on harvesting and managing data and providing query capabilities.
http://doras.dcu.ie/4555/
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Chemical species concentration measurement via wireless sensors
(2008)
Hayes, Jer; Beirne, Stephen; Kiernan, Breda M.; Slater, Conor; Lau, King-Tong; Diamond,...
Chemical species concentration measurement via wireless sensors
(2008)
Hayes, Jer; Beirne, Stephen; Kiernan, Breda M.; Slater, Conor; Lau, King-Tong; Diamond, Dermot
Abstract:
This paper describes studies carried out to investigate the viability of using wireless cameras as a tool in monitoring changes in air quality. A camera is used to monitor the change in colour of a chemically responsive polymer within view of the camera as it is exposed to varying chemical species concentration levels. The camera captures this image and the colour change is analyzed by averaging the RGB values present. This novel chemical sensing approach is compared with an established chemical sensing method using the same chemically responsive polymer coated onto LEDs. In this way, the concentration levels of acetic acid in the air can be tracked using both approaches. These approaches to chemical plume tracking have many applications for air quality monitoring.
http://doras.dcu.ie/715/
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Chemical species concentration measurement via wireless sensors
(2011)
Chemical species concentration measurement via wireless sensors
(2011)
Abstract:
This paper describes studies carried out to investigate the viability of using wireless cameras as a tool in monitoring changes in air quality. A camera is used to monitor the change in colour of a chemically responsive polymer within view of the camera as it is exposed to varying chemical species concentration levels. The camera captures this image and the colour change is analyzed by averaging the RGB values present. This novel chemical sensing approach is compared with an established chemical sensing method using the same chemically responsive polymer coated onto LEDs. In this way, the concentration levels of acetic acid in the air can be tracked using both approaches. These approaches to chemical plume tracking have many applications for air quality monitoring.
http://hdl.handle.net/10793/658
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Client service capability matching
(2004)
Lyttleton, Oliver Martin
Client service capability matching
(2004)
Lyttleton, Oliver Martin
Abstract:
In order to tailor web-content to the requirements of a device, it is necessary to access information about the attributes of both the device and the web content Profiles containing such information from heterogeneous sources may use many different terms to represent the same concept (eg Resolution/Screen_Res/Res). This can present problems for applications which try to interpret the semantics of these terms In this thesis, we present an architecture which, when given profiles describing a device and web service, can identify terms that are present in an ontology of recognised terms in the domain of device capabilities and web service requirements The architecture can semi-automatically identify unknown terms by combining the results of several schemamatching applications. The ontology can be expanded based on end-user’s interaction with the semi-automatic matchers and thus over time the application’s ontology will grow to include previously unknown terms.
http://doras.dcu.ie/18022/
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Competition at the wireless sensor network MAC layer: low power probing interfering with X-MAC
(2011)
Zacharias, Sven; Newe, Thomas
Competition at the wireless sensor network MAC layer: low power probing interfering with X-MAC
(2011)
Zacharias, Sven; Newe, Thomas
Abstract:
Wireless Sensor Networks (WSNs) combine sensors with computer networks and enable very dense, in-situ and live measurements of data over a large area. Since this emerging technology has the potential to be embedded almost everywhere for numberless applications, interference between different networks can become a serious issue. For most WSNs, it is assumed today that the network medium access is non-competitive. On the basis of X-MAC interfered by Low Power Probing, this paper shows the danger and the effects of different sensor networks communicating on a single wireless channel of the 2.4 GHz band, which is used by the IEEE 802.15.4 standard.
http://hdl.handle.net/10344/3788
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