Browsing by Author "Ribeiro, Manuel"

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    Assessing Short-range Shore-to-Shore (S2S) and Shore-to-Vessel (S2V) WiFi Communications
    (2024) d'Orey, Pedro M.; Gaitan, Miguel Gutierrez; Santos, Pedro M.; Ribeiro, Manuel; de Sousa, Joao Borges; Almeida, Luis
    Wireless communications increasingly enable ubiquitous connectivity for a large number of nodes, applications and scenarios. One of the less explored scenarios are aquatic ecosystems, specially when enabled by nearshore and short-range communications. Overwater communications are impaired by a number of distinguishing dynamic factors, such as tides, waves or node mobility, that lead to a widely fluctuating and unpredictable channel. In this work, we empirically characterize near -shore, overwater channels at 2.4 GHz under realistic conditions, including tidal variations, and relatively short TX-RX separations. To this end, we conducted experiments in a coastal estuarine region and on a harbor to characterize Shore -to -Shore (S2S) and Shore -toVessel (S2V) communication channels, respectively, and to identify major factors impairing communication in such scenarios. The empirical results show that constructive/destructive interference patterns, varying reflecting surface, and node mobility (i.e. travel direction and particular maneuvers) have a relevant and noticeable impact on the received signal strength. Thus, a set of parameters should be simultaneously considered for improving the performance of communication systems supporting S2S and S2V links, namely tidal variations, reflection surface changes, antenna height, TX-RX alignment and TX-RX separation. The results useful provide insights into realistic S2S and S2V link design and operation.
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    Predicting Lymph Node Metastasis in Non-small Cell Lung Cancer Prospective External and Temporal Validation of the HAL and HOMER Models
    (2021) Martinez-Zayas, Gabriela; Almeida, Francisco A.; Yarmus, Lonny; Steinfort, Daniel; Lazarus, Donald R.; Simoff, Michael J.; Saettele, Timothy; Murgu, Septimiu; Dammad, Tarek; Duong, D. Kevin; Mudambi, Lakshmi; Filner, Joshua J.; Molina, Sofia; Aravena, Carlos; Thiboutot, Jeffrey; Bonney, Asha; Rueda, Adriana M.; Debiane, Labib G.; Hogarth, D. Kyle; Bedi, Harmeet; Deffebach, Mark; Sagar, Ala-Eddin S.; Cicenia, Joseph; Yu, Diana H.; Cohen, Avi; Frye, Laura; Grosu, Horiana B.; Gildea, Thomas; Feller-Kopman, David; Casal, Roberto F.; Machuzak, Michael; Arain, Muhammad H.; Sethi, Sonali; Eapen, George A.; Lam, Louis; Jimenez, Carlos A.; Ribeiro, Manuel; Noor, Laila Z.; Mehta, Atul; Song, Juhee; Choi, Humberto; Ma, Junsheng; Li, Liang; Ost, David E.
    BACKGROUND: Two models, the Help with the Assessment of Adenopathy in Lung cancer (HAL) and Help with Oncologic Mediastinal Evaluation for Radiation (HOMER), were recently developed to estimate the probability of nodal disease in patients with non-small cell lung cancer (NSCLC) as determined by endobronchial ultrasound-transbronchial needle aspiration (EBUS-TBNA). The objective of this study was to prospectively externally validate both models at multiple centers.