Ioannis G. Papageorgiou

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This paper presents several methods based on signal strength and wave scattering models for tracking a user. The received-signal level method is first used in combination with maximum likelihood (ML) estimation and triangulation to obtain an estimate of the location of the mobile. Due to nonline-of-sight conditions and multipath propagation environments,(More)
The paper presents a new two-step cellular location determination (CLD) method based on signal strength and wave scattering models. The received signal level (RSL) method is first used in combination with maximum likelihood estimation (MLE) and triangulation to obtain an estimate of the location of the mobile. Due to non line of sight (NLOS) conditions and(More)
This paper presents a method based on wave scattering model for tracking a user. The 3D wave scattering multipath channel model of Aulin is employed together with particle filtering to obtain mobile station location and velocity estimates with high accuracy. This model takes into account non-line-of-sight and multipath propagation environments, which are(More)
Parasitic protozoa are unable to synthesise purines de novo and thus depend on the uptake of nucleosides and nucleobases across their plasma membrane through specific transporters. A number of nucleoside and nucleobase transporters from Trypanosoma brucei brucei and Leishmania major have recently been characterised and shown to belong to the equilibrative(More)
While purine transport has been widely studied in protozoa, almost nothing is known about their capacity to salvage pyrimidines. Here, we report a Leishmania major transporter with high affinity for uracil (Km=0.32+/-0.07 microM) which we designated LmU1. This transporter displayed a high degree of specificity, as it had virtually no affinity for cytosine,(More)
“Access to the right information anytime, anywhere” is becoming the new driving force for the information technology revolution. The “right” information’s relevance is based on the user’s profile and his/her current geographical position and/or time. Location Based Service (LBS) is an innovative technology that provides information or makes information(More)
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