Radio frequency interference affects the integrity, continuity and availability of the GPS system. These are the highly important parameters for critical applications like aviation. Interference also has an adverse impact on accuracy. Continuously operating reference stations (CORS) networks are employed to improve the accuracy of GPS position measurements used by surveyors. Interference can af...

Cooperative trajectory mapping is an emerging technique that allows users to create such a map by using data that is collected from each other’s mobile phones. This technique has been proposed for many applications, such as people localization, public transportation tracking, and traffic monitoring. Unlike the traditional GPS, cooperative trajectory mapping only requires information about the d...

In this paper we describe a modeling approach for studying fair rate sharing in a CDMA link. Capacity models derived for CDMA indicate that fair rate sharing belongs to the class of generalized processor sharing (GPS) schemes, as these were defined and studied by J.W. Cohen. From this starting point, we examine the steady-state characteristics of flows in a CDMA link considering multiple classe...

This article presents a novel network interface hardware architecture, which enables clock synchronization in fault-tolerant distributed real-time systems with sub-μsrange accuracy. The proposed mechanism, which is applicable for any packet-oriented data network, inserts time information into data packets at the interface between the physical layer transceiver and the network controller upon pa...

This paper describes a novel network interface hardware, which enables clock synchronization with sub-μs-range accuracy in network-coupled distributed systems. The basic idea, which works for any packet-oriented data network, is to timestamp data packets at the interface between physical layer transceiver and network controller upon packet arrival and departure. Our particular implementation ta...

Geographic information from the global positioning system (GPS) logs of taxi cabs are useful in the novel applications like Smart Maps needed for a city traffic. The historical path logs of the GPS trajectories are mined to provide the landmark graph. Based on the landmark graph and the routing algorithm that uses the variance-entropy based clustering techniques to build and evaluate the system...

BACKGROUND Network forms of organization are increasingly popular in primary care. At the end of the 1990s General Practitioners (GPs) in Italy were given the opportunity to adopt network forms of organization with the aim of improving the quality of their services. However factors affecting GPs' choices to join a network and the consequences of network membership have not been evaluated. MET...

This paper considers the micro-econometric analysis of patients’ hospital choice for elective medical procedures when their choice set is pre-selected by a general practitioner (GP). It proposes a two-stage choice model that encompasses both, patient and GP level optimization, and it discusses identification. The empirical analysis demonstrates biases and inconsistencies that arise when strateg...