Technical articles A selection of technical papers and articles, relevant to your industry.
Lasers  | Pulsed power modules for compact excimer lasers
A Görtler & C Strowitzki, TuiLaser AG (October 2002)
For generation of excimer radiation, pulsed gas discharges under high pressure are necessary. In the pulsed power module thyristors or IGBTs are installed with additional magnetic switches for pulse compression. The state of the art of these circuits and test results of new magnetic materials used in pulse compression stages will be discussed.
Source: European Pulsed Power Symposium 2002, 22-24 October 2002 |
Location Based Services | | Managing the mega flock
Wendy Laursen (February 2006)
Sheep farmers in Australia’s outback are set to revolutionise their lifestyles with electronic systems that enable them to manage flocks from the comfort of their homesteads
Source: | | | We know where you are
K Raja, W J Buchanan and J Munoz (June 2004)
New services which depend on cellular networks accurately determining handset position are said to be the next holy grail for mobile operators. This article examines the available technologies and their prospects.
Source: Communications Engineer, June 2004 | | | 3G killer apps everywhere
T Ahonen (June 2004)
A service is called a 'killer application' if that service alone is sufficiently compelling to persuade someone to buy a device or a subscription. Killer applications are not necessarily the biggest revenue earners, but are new services that would compel a customer to get a new handset or sign up with a new operator. This article looks at a variety of 'killer apps' for 3G telecommunications networks.
Source: Communications Engineer, June 2004 | | | Wireless location technology
E Loi, Singtel Mobile (March 2004)
Locating a person or object wirelessly can be achieved in a variety of ways. The various techniques all differ in accuracy, cost, and ease of implementation. While all of these methods apply to terrestrial cellular systems, some require minor modifications to only the network infrastructure, while others require new technology in the handsets as well. Operators usually choose a variation of one or more of the methods, depending upon which application best suits the network already in place. As wireless location technology moves forward, accuracy and cost of implementation will improve, but it is likely that no single technology will prove better than all the rest for all environments.
Source: Communications Engineer, April 2004 - online | | | Intelligent inhabited environments as location based services [slides]
The Intelligent Inhabited Environments Group, University of Essex (September 2002)
The work of the Intelligent Inhabited Environment (IIE) group is briefly described. The term IIE is then defined, and example of an ‘intelligent dormitory’ (iDorm) is then elaborated. The communication structure and interfacing mechanisms are outlined, and the types and mechanisms of LBS in IIEs considered. Finally the linkages between the IIE concept and those of ubiquitous computing and ambient intelligence are drawn.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Integrated location technologies [slides]
S Atkinson, Roke Manor Research Ltd (September 2002)
There are many competing location technologies – no single location technology meets all LBS needs.The way ahead is integration of location technologies. The existing single technologies are reviewed, and hybrid/integrated systems (both loosely and closely coupled) described. Particular attention is given to EMILY, an optimised hybridisation The available benefits of the latter are discussed, and the factors contributing to a successful integrated system are considered.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | The sentient car : context-aware automotive telematics [slides]
P Vidales & F Stajano, University of Cambridge (September 2002)
First on-board systems are presented - current systems are reviewed, future systems are anticipated, and the importance of location is emphasised. The conceptual model for the sentient car is then presented, an example application of an adaptive pollution map is described.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | GPS / GPS-L2C / Galileo / GPS-III signal acquisition in the indoor environment
P G Mattos, STMicroelectronics (September 2002)
The problem with GPSII staellites in location based services is signal strength. Methods for improving sensitivity, reducing frequency and time ambiguity, increasing processing performance, signal improvements, are reviewed and some experimental results are presented.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | mPower: putting decision-making back in the hands of mobile workers [slides]
J Shepherdson, BTexact Technologies (September 2002)
A review of the mPower service is offered. Based on LEAP (Lightweight Extensible Agent Platform) technology, mPower provides ubiquitous access, is device agnostic, and provides various generic services (so far, knowledge management, travel management and distributed teamwork co-ordination), and more will be added as required. The results of the technology trial are described in some detail.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Using location data to support an event management system [slides]
J Paget, BTexact Technologies (September 2002)
The author defines an event management system, and explains why location is important, before proceeding to outline some system architectures and event control features
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Adaptation to wireless data communications in location based services [slides]
H Laamanen et al., Sonera (September 2002)
The background to this paper is the EU IST 5th framework project (known as the CRUMPET project). Aspects of the reference architecture are then described, and the nomadic application support ontology is outlined. The mechanism by which the wireless link is monitored and controlled is summarised. Experimental results are presented, and opportunities for future work presented.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Mobile LBS value chains - a discussion of the issues [slides]
C Harvey, Coleago Consulting (September 2002)
The questions of what people want and whether they will pay for it are first considered. The main players in providing services are identified – these competitors can be partners too. Issues of where revenue may be raised, and how might it be shared amongst the players are also tackled.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | E-OTD: business case for location services [slides]
A Pickford, Cambridge Positioning Systems (September 2002)
The US experience of location based services is first described, followed by a brief worldwide review. The industry momentum for E-OTD adoption is then analysed, and the opportunities for global take-up are considered.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | From local to global scale: the choice of location technology [slides]
A W Jones, Generics Group (September 2002)
The considerations of business needs and requirements in choosing a location technology are reviewed, including what you want from locations, high vs. low accuracy, availability, local to global scale. Some example technologies are reviewed in nmore detail.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Survey of current location and positioning techniques
M Ali, Oxford Brookes University (September 2002)
This paper presents a survey of the latest industrial mobile location and positioning techniques being implemented and marketed globally, the major players and their corresponding technology is clearly identified and explained. The research presented here is a significant, expanded and updated former paper by the author.
Source: IEE Seminar on Location Based Services, 16 September 2002 |  |
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Source: | | | A context-aware notification service
E Katsiri, Cambridge University (September 2002)
This paper discusses the principles of making inferences about a user's context from location time-series. These principles have been implemented and embedded in a statistical model, used in a Sentient Notification Service. This model makes estimates about the probability of a situation occuring in the future, based on users' locations and past behaviour and using methods such as Bayesian inference. This information is then used by a Context-Aware Notification Service to notify all registered users who are interested in the particular activity.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Location of simple nodes in an ad-hoc network
D P Robinson & I W Marshall, BTexact Technologies (September 2002)
Historically, the problem of node location in ad-hoc networks has been addressed using reference points. Each node uses these reference points to calculate their position by triangulation, some other positioning algorithm. This paper finds two further solutions to the problem of node location: first, an extension of existing trigonometric techniques allowing ambiguities in node location to be passed through the network: second, an iterative approach whereby each node guesses its location then alters that guess when it receives additional information from its neighbours.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Considerations on GPS disruption
D A Hayes, UK Radiocommunications Agency (September 2002)
The use of GPS has obvious benefits for the UK economy and should be encouraged. However, there is no doubt that businesses using GPS in critical applications should have backup provisions for providing timing or navigation information. Companies and organisations utilising GPS should consider for themselves the consequences of any disruption to the GPS service and the impact it may have on their business.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | A solution on the degradation of accuracy of mobile location in the presence of repeaters for FDD in UMTS
B A Bakaimis, Samsung Electronics Research Institute (September 2002)
The purpose of this paper was to propose a new approach of dealing with the problem of mobile positioning in the presence of repeaters. The performance of this proposal for different deployment scenarios was investigated. Experimental results are presented which suggest a signifcant improvement. Given that UMTS cells will be far smaller than GSM, this paper has covered the largest part of the deployment scenarios for UMTS.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Using JavaSpaces in location based services
N Warren, IntaMission Ltd (September 2002)
JavaSpaces are derived from research in the field of Tuple Spaces. Spaces allow distributed systems to communicate asynchronously and hence reduce system wide coupling to levels that have not been achievable by other means. They are defined in a standard published by Sun Microsystems, and communicate by sharing Objects within a distributed system. These notes present a location based scenario in which a number of ‘Actors’ of different types may find other Actors, although all of the Actors within the example are capable of moving within a defined area.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Small GPS antennas for positioning personal wireless mobility devices
O P Leisten & A Wingfield, Sarantel Limited (September 2002)
Sarantel has been researching a dielectric-loaded quadrifilar antenna technology which takes control of the resonant near-fields through the use of a high-dielectric core and also a feed topology that isolates the antenna from handset-ground. This paper shares evidence that this strategy makes the electrical performance of the antenna predictable, and thus in-use performance can be better than the conventional (antenna-is-as-big-as-the-box) proposition.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Overview of location based services
T D?Roza (September 2002)
This paper provides an overview of terms, technologies and standards used within the Location Based Services field in the determination and presentation of the location of an entity. It also provides some insight into how location information can be used in a range of applications.
Source: IEE Seminar on Location Based Services, 16 September 2002 | | | Secondary uses of location services: the Datafreeze patent [slides]
A Kelman, Telepathic Industries Limited (September 2002)
Datafreeze is a technical invention, set out in an international patent application, and now in its national phase in many countries. Datafreeze conceals location information within digitally signed electronic transactions thereby creating additional corroborative evidence of the validity or otherwise of the transaction. The algorithm is efficient in encryption and decryption – allowing it to be deployed in the current generation of cellular telephones as well as in computer workstations.
Source: IEE Seminar on Location Based Services, 16 September 2002 |
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