1,721,051 research outputs found
Outdoor sports tracking by means of hybrid GPS-LoRaWAN localization
No full textIn this paper, we propose a hybrid LoRaWAN/GPS solution for the tracking of athletes performing outdoor sport activities. The combination of the two technologies has the main purpose of optimizing power consumption by limiting GPS usage and providing a continuous people tracking even in case of GPS-denied areas, for example when walking through woods and forests. In this case, GPS is replaced by LoRaWAN connectivity which, besides acting merely as a data transmission technology, thus sending the user's position to a remote server, is also used to estimate such position. To this aim, different localization techniques are evaluated, testing a simple technique based on preliminary area mapping and presenting a data fusion technique to improve the positioning accuracy. To demonstrate the feasibility of the proposed approach, a prototypical tracker was set up, integrating a GPS module with a LoRa transceiver. Then, field tests were performed correlating the positions along a pre-defined path, acquired by means of a GPS module, with the Received Signal Strength Indication (RSSI) values related to the LoRaWAN transmission. Acquired values suggest the usability of these parameters to estimate the user's position in case of lack of GPS coverage
LoRaWAN in Motion: Preliminary tests for real time low power data gathering from vehicles
No full textThe aim of this paper is to study the usability of the Long Range (LoRa) Wide Area Network (LoRaWAN) protocol in the context of vehicular networks, in order to exploit it as enabling technology for the realization of Internet of Things (IoT) solutions within automotive contexts. Despite the critical requirements of this application scenario in terms of bandwidth and latency, LoRaWAN may be exploited for several purposes thanks to its excellent performances in terms of low power consumption and long transmission range. However, the vehicular context features some peculiar constraints that require a specific validation of this technology. One of this requirements concerns the fact that vehicles are actually in motion when transmitting data. Such motion can occur at different speeds that may affect in some way the transmission performances. To this aim, the performances of the LoRaWAN link are evaluated with the transmitter in motion at different speeds, from 20 km/h up to 90 km/h. In particular, received packets percentage, Received Signal Strength Indicator (RSSI) and Signal to Noise Ratio (SNR) are measured, with varying transmission setups in terms of Spreading Factor (SF). The measurement campaign is carried out in an elliptical track, with a LoRaWAN Gateway positioned exactly in its center, in order to limit the variations of the wireless link. Achieved results demonstrate the robustness of LoRaWAN also in case of transmissions taking place in motion, with limited signal degradation in the case of highest speed values
PROTEOMIC ANALYSIS OF AMYCOLATOPSIS BALHIMYCINA TO REVEAL NOVEL LINKS BETWEEN PRIMARY AND SECONDARY METABOLISM.
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Comparative proteomics and immunoproteomics of Helicobacter pylori related to different gastric pathologies
No full textHelicobacter pylori is a Gram-negative bacterium which causes ulcer, atrophic gastritis, adenocarcinoma, or mucosa-associated lymphoid tissue lymphoma. A comparative proteomic and immunoproteomic analysis was chosen to identify the antigenic patterns of three different H. pylori strains. These strains were probed against single sera from H. pylori-positive patients affected by gastric adenocarcinoma or duodenal ulcer. We found a quite heterogeneous antigenic pattern, both from strain and sera points of view, thus underlying both a strain- and a host-specificity. The different antigenic repertoires introduced the importance of the strain to be used for immunoblotting as a diagnostic test
LoRaWAN Underground to Aboveground Data Transmission Performances for Different Soil Compositions
Full text linkThe aim of this article is to discuss the usability of the long-range (LoRa) transmission technology together with the LoRa wide-area network (LoRaWAN) protocol for underground monitoring activities. In particular, this article focuses on the transmission performances in different soils (i.e., gravel, sand, and clay), for an underground-to-aboveground (UG2AG) communication. The three soils have been chosen in order to test the system behavior in case of pure soil compositions, in order to provide a general result that can be used to evaluate the transmission chances for any kind of soil. The performances of the transmission channel have been tested using an experimental setup for depths up to 50 cm, acquiring the values of the received signal strength indicator (RSSI) and the signal-to-noise ratio (SNR) for every transmission and analyzing the packet loss (PL). Such a kind of system may be crucial in several application scenarios, such as environmental monitoring or smart agriculture, where the real-time, remote acquisition of underground parameters at different depths is required
Security and Privacy of Smart Waste Management Systems: A Cyber-Physical System Perspective
No full textSmart Waste Management Systems (SWMSs) represent a fundamental technology to efficiently manage the waste management and disposal process. Indeed, they provide means to efficiently manage the collection process, to optimize resources, and foster the adoption of recycling policies. These systems are increasingly more connected and equipped with communication and sensing capabilities. Currently, the research on SWMSs security only focuses on the communication part. However, SWMSs may be subject to different cyber-physical threats due to the interconnection of information and operational technologies. In this paper, we investigate the security and privacy issues of SWMSs from a cyber-physical system perspective. To provide a clear understanding of the possible threats, we first provide an overview of the current state-of-the-art on SWMSs implementations. We then review the attacks and security measures proposed in the literature, showing that they solely focus on communication technologies. Then, we provide a thorough overview of all possible cyber-physical threats towards SWMSs. Our analysis shows SWMSs are still vulnerable to a large number of threats impacting both the system’s and the users’ security, privacy, and safety
A proteomic approach to investigate the spatial and temporal response of Populus nigra to mechanical stress.
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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