Encontrados 64 documentos, a visualizar página 1 de 7
Analyzing the quality of crowd sensed WiFi data
Pérez-Penichet, Carlos; Moreira, AdrianoThe widely extended WLAN infrastruc- ture has often been used as geographic landmark to support localization applications and human mobility studies. In these applications a WiFi network made of static nodes seems to be always assumed. Here, evidence is presented to show that this is hardly ever the case. Several independently collected datasets were analyzed to show that dynamic, moving Access Points are often...
Integrating public transportation data : creation and editing of GTFS data
Braga, Mário José Matos; Santos, Maribel Yasmina; Moreira, AdrianoPresented at the 2014 World Conference on Information Systems and Technologies (WorldCIST'14). Serie - Advances in intelligent systems and computing, vol. 276 ; The current state of standardization related to representa tion and exchange of data about public transportation systems is still at its infancy, which leads to severe interoperability issues in projects that depend on the data from several diverse sou...
Indoor positioning and navigation, part III : navigation systems
Moreira, Adriano; Mautz, RainerIn the age of automation the ability to navigate persons and devices in indoor environments has become increasingly important for a rising number of applications. With the emergence of global satellite positioning systems, the performance of outdoor navigation has become excellent, but many mass market applications require seamless navigation capabilities in all environments. Therefore indoor navigation has bec...
Removing useless APs and fingerprints from WiFi indoor positioning radio maps
Eisa, Samih; Peixoto, João; Meneses, Filipe; Moreira, AdrianoMaintaining consistent radio maps for WiFi fingerprinting-based indoor positioning systems is an essential step to improve the performance of the positioning engines. The radio maps consist of WiFi fingerprints collected at a predefined set of positions/places within a positioning area. Each fingerprint consists of the identification and radio signal level of the surrounding Access Points (APs). Due to the wide...
Social interactions around public transportation
Machado, Sandro; José, Rui; Moreira, AdrianoIn this work, we explore how information services can be used to improve the travel experience in public transportation and reduce the perceived travel time. More specifically, we describe the creation of a mobile application for assisting passengers, which explores the integration of social networking features into the traveling experience. The overall objective is to understand how social networking concepts ...
Human mobility analysis by collaborative radio landscape observation
Pérez-Penichet, Carlos; Conde, Ângelo; Moreira, AdrianoA new method to analyze the spatio-temporal activities of humans based on the symbolic information that can be extracted from a set of observations of mobile networks taken through smart phones is presented. Specifically, GSM andWiFi network observations collected by several users are gathered to collaboratively build a symbolic base map of the logical structure of the geography. At the same time a map of the m...
Requirements and metrics for location and tracking for ambient assisted living
Eisa, Samih; Moreira, AdrianoLocation and tracking services and technologies are becoming fundamental components for supporting healthcare solutions. They facilitate patients’ tracking and monitoring processes and also allow for better and long-term daily activity recognition. Various location and tracking services have been developed, over the last years, to provide real time localization for different applications. However, most of these...
Combining similarity functions and majority rules for multi-building, multi-flo...
Marques, Nelson; Meneses, Filipe; Moreira, AdrianoFingerprint is one of the most widely used methods for locating devices in indoor wireless environments and we have witnessed the emergence of several positioning systems aimed for indoor environments based on this approach. However, additional efforts are required in order to improve the performance of these systems so that applications that are highly dependent on user location can provide better services to ...
Large scale movement analysis from WiFi based location data
Meneses, Filipe; Moreira, AdrianoUnderstanding and modeling the way humans move in urban contexts is beneficial for many applications. The recent advances on positioning technologies, namely those based on the ubiquity of wireless networks, is facilitating the observation of people for human motion analysis. In this paper we present the result of a large scale work conducted to study the human mobility in a University’s campuses. The study was...
Multi-technology RF fingerprinting with leaky-feeder in underground tunnels
Pereira, Fernando; Theis, Christian; Moreira, Adriano; Ricardo, ManuelTechniques using RSS fingerprinting for localization have been studied over a number of ifferent technologies in many different scenarios. In the case of underground tunnels localization can be quite challenging, yet it is extremely important for safety reasons. In the specific case of the CERN tunnels, accurate and automatized localization methods would additionally allow the orkflow of some activities to beco...
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