254 research outputs found
Supporting Smart Farming through Bandwidth Adaptation in Satellite Communications
No full textAccess to the Internet is a crucial enabler for many of the Sustainable Development Goals (SDGs) of the United Nations. Unfortunately, a significant part of the world's population is left behind due to the lack of access to a reliable and affordable Internet connection. Satellites have the potential to impact the current market of Internet services significantly. In particular, Low Earth Orbit (LEO) satellites promise high-bandwidth without compromising latency. They can be employed in 5G Non-Terrestrial Networks (e.g., IoT connectivity, connected autonomous driving, communication in rural areas, and more). Smart farming and precise agriculture (even remotely controlled), especially in underdeveloped areas, are compelling use cases for LEO satellites. In these scenarios, high bandwidth and low latency are required to facilitate both quick transmission of images/videos and prompt remote control of drones, tractors, actuators, etc. This study compares different TCP protocols based on the..
Smart Mobility Applications Supported by Non-Terrestrial Networks: Addressing the Need for Low Per-Packet Delays
No full textLow Earth Orbit (LEO) satellites offer a promising solution for ubiquitous connectivity and can be utilized in 5G Non-Terrestrial Networks (NTNs) for applications like IoT, autonomous driving, and rural communication. They are particularly suited for smart mobility in urban environments, where fast data transmission and real-time control of vehicles and infrastructure are crucial. In this study, we compare TCP protocols for satellite communication in smart mobility scenarios and propose a solution that uses a limited buffer size to reduce per-packet delays without affecting the throughput
Bilateral Central Core and an External Envelope and its Impact on the Thermal Behaviour of Individual Self-construction Housing in the City of Biskra
No full textAbstractThe essence of architectural design rests upon in kind of manipulation between dualism central core and external envelope of any architectural composition; there are some compositions that are concerned with the external envelope,while other compositions the outer shell is result of the interned division. Besides there are other compositions that blend the central core and the external envelope in a harmonious dialogue. This combination between central core and the external envelope touch this diversity in houses of Biskra city through different periods of time to create a comfortable thermal environment.The dry areas, which are distributed on a large scale over the space of Algeria, characterized by climate is hot and dry. We found Morphological diversity in houses of this region that reflects primarily adaptation to climatic conditions, social and economic through different periods.In our research, we depend on the experimental method through digital simulation technology program ECOTECT to calculate data, for various thermal models. in addition in the selection of network studied models we adopted to the variables morphology of both core and the external envelope of the dwelling which are: 1) the oceanic layer, 2) type of the core 3) type of the external envelope. Then we calculated the temperature of various houses layers to make comparisons between various layers and various models.The results of this study came to show the laws that control heat in the atmosphere and that is affected by alphabet elements of local architecture of Biskra region. These laws allow the architect to manipulate to these elements to search for improved thermal yield of the building and control of energy consumption in the range of what is available to him
Preparation and characterization of glassy carbon powder modified with a thin layer of boron-doped ultrananocrystalline diamond (B-UNCD)
No full textS.2705-2713The surface of glassy carbon powder (4 mu m diam, 2m(2)/g) was modified with a thin layer of borondoped ultrananocrystalline diamond (B-UNCD) for the purpose of improving the dimensional stability and corrosion resistance of the material. The UNCD layer was deposited by microwave-assisted chemical vapor deposition using a 1% CH4, 7% H-2, 92% Ar and 1 x 10(-3) % B2H6 (10 ppm) source gas mixture at 800 W or microwave powder and a system pressure of 140 Torr. Each sample was coated twice using a 2 h growth period with powder mixing in between to increase the number of particles coated and the coverage over each particle. SEM, XRD, Raman spectroscopy, and electrochemical methods were used to characterize the as received and B-UNCD-GC powders before and after anodic polarization at 1.6 V vs Ag/AgCl (25 degrees C 30-60 min) in 0.5 M H2SO4. Most particle surfaces were coated with a thin layer of UNCD and there was some particle aggregation due to diamond overlayer formation over multiple neighboring particles. The results demonstrate that the as received powder undergoes surface oxide formation, layer plane exfoliation and fracturing caused by the stress of the oxide formed and or the oxidation of an intercalation compound, and carbon corrosion during electrochemical polarization. On the other hand. negligible microstructural damage or corrosion was found for the B-UNCD-coated powder. The work demonstrates that modification of sp(2) carbon powders with a thin layer of conducting diamond is a viable approach for creating a more durable and corrosion-resistant carbon powder.21Nr.1
A novel m-Health system for epidemic tracking and prediction using Big Data and Electronic health record
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