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Sérgio Duarte David Navalho Heitor Ferreira Nuno Preguiça 《Mobile Networks and Applications》2013,18(3):357-372
Participatory Sensing is a new computing paradigm that aims to turn personal mobile devices into advanced mobile sensing networks. For popular applications, we can expect a huge number of users to both contribute with sensor data and request information from the system. In such scenario, scalability of data processing becomes a major issue. In this paper, we present a system for supporting participatory sensing applications that leverages cluster or cloud infrastructures to provide a scalable data processing infrastructure. We propose and evaluate three strategies for data processing in this architecture. 相似文献
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This paper focuses on the design of time-homogeneous fully observed Markov decision processes (MDPs), with finite state and action spaces. The main objective is to obtain policies that generate the maximal set of recurrent states, subject to convex constraints on the set of invariant probability mass functions. We propose a design method that relies on a finitely parametrized convex program inspired on principles of entropy maximization. A numerical example is provided to illustrate these ideas. 相似文献
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This paper presents a survey on Nonlinear Analog-to-Digital converters (ADC). This class of converters is extremely relevant in applications where there is a need for non-uniform quantization characteristic, for example, some specific applications in the areas of light detection, hearing aid, nuclear physics, image acquisition, communication systems, etc. This survey outlines the state-of-the-art Nonlinear ADC topologies, such as, floating point, logarithmic, piecewise linear and oversampled nonlinear converters, and discusses their performance and advantages in terms of their applications. 相似文献
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L. Fonseca M. D. Santos R. P. Queirós I. Abrantes J. A. Saraiva 《Holz als Roh- und Werkstoff》2014,72(6):825-827
The efficacy of high pressure processing, a non-thermal phytosanitary treatment, to eliminate Bursaphelenchus xylophilus in Pinus pinaster wood was evaluated. Infected wood sections and chips were exposed to high pressure processing for 5 min at 5, 15 and 30 MPa. Live nematodes were observed in wood sections and chips treated at 5 and 15 MPa but at 30 MPa no nematodes were detected. The results revealed that high pressure processing was successful in eliminating B. xylophilus from wood materials. 相似文献
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Hugo Plácido da Silva André Lourenço Ana Fred Nuno Raposo Marta Aires-de-Sousa 《Computer methods and programs in biomedicine》2014
The Check Your Biosignals Here initiative (CYBHi) was developed as a way of creating a dataset and consistently repeatable acquisition framework, to further extend research in electrocardiographic (ECG) biometrics. In particular, our work targets the novel trend towards off-the-person data acquisition, which opens a broad new set of challenges and opportunities both for research and industry. While datasets with ECG signals collected using medical grade equipment at the chest can be easily found, for off-the-person ECG data the solution is generally for each team to collect their own corpus at considerable expense of resources. In this paper we describe the context, experimental considerations, methods, and preliminary findings of two public datasets created by our team, one for short-term and another for long-term assessment, with ECG data collected at the hand palms and fingers. 相似文献
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Tânia F.C.V. Silva M. Elisabete F. Silva A. Cristina Cunha-Queda Amélia Fonseca Isabel Saraiva M.A. Sousa C. Gonçalves M.F. Alpendurada Rui A.R. Boaventura Vítor J.P. Vilar 《Water research》2013
A multistage treatment system, at a scale close to the industrial, was designed for the treatment of a mature raw landfill leachate, including: a) an activated sludge biological oxidation (ASBO), under aerobic and anoxic conditions; b) a solar photo-Fenton process, enhancing the bio-treated leachate biodegradability, with and without sludge removal after acidification; and c) a final polishing step, with further ASBO. 相似文献
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A Quinacrine Analogue Selective Against Gastric Cancer Cells: Insight from Biochemical and Biophysical Studies 下载免费PDF全文
Ana Gomes Dr. Iva Fernandes Dr. Cátia Teixeira Prof. Nuno Mateus Prof. M. J. Sottomayor Prof. Paula Gomes 《ChemMedChem》2016,11(24):2703-2712
One of the earliest synthetic antimalarial drugs, quinacrine, was recently reported as interesting for the treatment of acute myeloid leukemia. Inspired by this and similar findings, we evaluated a set of quinacrine analogues against gastric (MKN‐28), colon (Caco‐2), and breast (MFC‐7) cancer cell lines and one normal human fibroblast cell line (HFF‐1). All the compounds, previously developed by us as dual‐stage antimalarial leads, displayed antiproliferative activity, and one of the set stood out as selective toward the gastric cancer cell line, MKN‐28. Interestingly, this compound was transported across an in vitro MKN‐28 model cell line in low amounts, and approximately 80 % was trapped inside those cells. Nuclear targeting of the same compound and its interactions with calf thymus DNA were assessed through combined fluorescence microscopy, spectroscopy, and calorimetry studies, which provided evidence for the compound's ability to reach the nucleus and to interact with DNA. 相似文献