Listar INIT_Articles por título
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Scalable and Efficient Clustering for Fingerprint-Based Positioning
IEEE (2023)Abstract: Indoor positioning based on IEEE 802.11 wireless LAN (Wi-Fi) fingerprinting needs a reference data set, also known as a radio map, in order to match the incoming fingerprint in the operational phase with the ... -
Second-harmonic illumination to enhance multispectral digital lensless holographic microscopy
Optical Society of America (2016-03)Multispectral digital lensless holographic microscopy (MDLHM) operating with second-harmonic illumination is shown. Added to the improvement of the spatial resolution of the previously reported MDLHM operating with ...
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Second-order analysis of anisotropic spatiotemporal point process data
Wiley (2015-02)Second-order orientation methods provide a natural tool for the analysis of spatial point process data. In this paper, we extend to the spatiotemporal setting the spatial point pair orientation distribution function. The ... -
Second-order and local characteristics of network intensity functions
Springer (2021)The last decade has witnessed an increase of interest in the spatial analysis of structuredpoint patterns over networks whose analysis is challenging because of geometricalcomplexities and unique methodological problems. ...
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Second-order smoothing of spatial point patterns with small sample sizes: a family of kernels
Springer Verlag (2015-01)We consider kernel-based non-parametric estimation of second-order product densities of spatial point patterns. We present a new family of optimal and positive kernels that shows less variance and more flexibility than ...
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Security and Reliability of Room Occupancy Detection Using Probe Requests in Smart Buildings
IEEE (2023-04-19)We present new approaches for determining occupancy in smart building management systems. The solutions can be applied dually, in civil and military areas, not only for economic management but also in crisis situations ...
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Security authentication using phase-encoded nanoparticle structures and polarized light
Optical Society of America (2015)Phase-encoded nanostructures such as quick response (QR) codes made of metallic nanoparticles are suggested to be used in security and authentication applications. We present a polarimetric optical method able to authenticate ...
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Self-exciting point process modelling of crimes on linear networks
SAGE Publications (2022)Although there are recent developments for the analysis of first and second-order characteristics of point processes on networks, there are very few attempts in introducing models for network data. Motivated by the analysis ...
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Self-referenced phase reconstruction proposal of Ghz bandwidth non-periodical optical pulses by in-fiber semi-differintegration
Elsevier (2011)We propose two new techniques able to retrieve the phase profile of a given temporal optical pulse based on the use of in-fiber semi-differintegral operators, where by semi-differintegration we mean either a 0.5th-order ...
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Self-similar behavior in semiconductor superlattices
World Scientific Publishing Company (2012)The scattering of particles in fractal superlattices has been analyzed by means of the transfer matrix method. The fractal superlattice consists of alternating layers of semiconductor materials following the rule of a ...
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Self-similar focusing with generalized devil’s lenses
Optical Society of America (2011)We introduce the generalized devil’s lenses (GDLs) as a new family of diffractive kinoform lenses whose structure is based on the generalized Cantor set. The focusing properties of different members of this family are ...
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Sense of place and the city: the case of non-native residents in Lisbon
University of Maine (United States) (2021-11-19)When immigrants move to a new city, they tend to develop distinct relationships with the urban landscape, which in turn becomes the new setting of their routine-based activities that evolve over time. Previous works in ...
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Sentinel-2 and Sentinel-3 Intersensor Vegetation Estimation via Constrained Topic Modeling
IEEE (2019-03)This letter presents a novel intersensor vegetation estimation framework, which aims at combining Sentinel-2 (S2) spatial resolution with Sentinel-3 (S3) spectral characteristics in order to generate fused vegetation maps. ...
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Sentinel-3 Super-Resolution Based on Dense Multireceptive Channel Attention
IEEE (2021-07-16)The unprecedented availability of remote sensing data from different complementary Sentinel missions provides increasing opportunities to alleviate the spatial limitations of Sentinel-3 (S3) from an intersensor perspective. ...
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Sentinel-3/FLEX Biophysical Product Confidence Using Sentinel-2 Land-Cover Spatial Distributions
IEEE (2021-03-11)The estimation of biophysical variables from remote sensing data raises important challenges in terms of the acquisition technology and its limitations. In this way, some vegetation parameters, such as chlorophyll fluorescence, ...
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SEnviro: A Sensorized Platform Proposal Using Open Hardware and Open Standards
MDPI (2015-03)The need for constant monitoring of environmental conditions has produced an increase in the development of wireless sensor networks (WSN). The drive towards smart cities has produced the need for smart sensors to be able ...
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Separable soft shadow mapping
Springer (2015-02)We propose an efficient technique for rendering visually plausible real-time soft shadows in screen space. First, we propose a novel blocker estimation technique based on a separable filter. Second, our technique performs ...
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Shape description from generalized support functions
Elsevier (2013)The generalized support function is considered to be a representation of shape properties of compact connected sets in R2. Some interesting properties are studied and several parameters are defined for use in shape description ...
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Shaping digital earth applications through open innovation – setting the scene for a digital earth living lab
Taylor & Francis (2013-06)
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Journal of Visualized Experiments (2019-01-29)The aim of this article is to visually demonstrate the utilization of an interferometric method for encoding complex fields associated with coherent laser radiation. The method is based on the coherent sum of two uniform ...
