The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The talk will start with a historical review appreciating and emphasizing the importance and relevance of the Hanbury-Brown & Twiss (HBT) experiment for nowadays quantum optics. Then, we investigate within a modern and sophisticated version of the HBT experiment the quantum optical properties of optoelectronic quantum dot based superluminescent diodes (SLDs). The demonstrated full incoherence...
THE quest for miniaturization of integrable optoelectronic devices has led to the development of smaller and smaller nanolasers. Optical microcavities are used to confine the electromagnetic field on the extent of the wavelength itself, culminating in photonic-crystal cavities that combine small mode volumes with long storage time of photons. The small mode volume in particular puts a limit on the...
Cohesion of a software module broadly refers to the relatedness of the elements of the module. A highly cohesive module has elements that all contribute to a single common purpose. Such modules are believed to be more understandable and maintainable. Most existing object-oriented class cohesion metrics measure the cohesion of a class based on internal connections between the methods of the class where...
This paper exploited the single trial decoding of cortical-muscular activities (CMAs). The CMAs were measured by acquiring Electromyographic (EMG) signal, and Electroencephalographic (EEG) signal. We focused on CMAs related to sustained muscular contractions (SMC), and investigated on the classification performance of four types of CMAs with different combinations of three types of features. The four...
We report measurement of mode-locking process using optical pulse ruler. It can provide an approachable optical pulse measurement tool like a litmus paper for pH measurement in a liquid solution.
We present nonasymptotic bounds on the maximum coding rate achievable over a Rician block-fading channel for a fixed packet size and a fixed packet error probability. Our bounds, which apply to the scenario where no a priori channel state information is available at the receiver, allow one to quantify the tradeoff between the rate gains resulting from the exploitation of time-frequency diversity and...
The current design drivers for multi-cores, namely performance per watt, scalability and flexibility, make the Networks-on-Chip (NoCs) the de-facto on-chip interconnect. State of the art NoCs can exploit heterogeneous solutions and complex DVFS techniques to fulfill also the variability of the application requirements. Relevant showstoppers to the design of a truly flexible NoC fitting all the possible...
Many multicore and manycore architectures support hardware cache coherence. However, most of them rely on software techniques to maintain Translation Lookaside Buffer (TLB) coherence, namely the TLB shootdown routine, which is a costly procedure, known to be hardly scalable.The TSAR architecture is a manycore architecture including hardware TLB coherence, but in which the TLB coherence mechanism is...
The Compressed Sensing (CS) framework is heavily utilized to reduce data rate in hardware restricted scenarios by exploiting the intrinsic sparsity of the transmitted data. Considering multiple sensors at the same time, one variation of the Multi Channel (MC) framework takes several measurements at one time instant and then uses CS in the spatial domain to compress the data. This paper provides a...
Target detection in the presence of mainlobe jamming (MLJ) is a challenging task for radar signal processing. Spatial filtering techniques for MLJ cancellation on uniform linear array (ULA) have been proposed recently. However, the performance of these techniques degrades greatly when MLJ is located close to target. To solve this problem, we propose a sparse detection method on uniform distributed...
In the era of constantly increasing Earth Observation (EO) data collections, information extraction and data analysis should be enhanced with a multi-temporal component enabled by the temporal resolution of satellite missions and create handy, yet powerful tools for those applications involving monitoring of land cover. The image time series, as results of the satellite revisiting period, gives you...
This paper presents the main concepts and the initial analysis of the ESA SEOM project SInCohMap “EXPLOITATION OF SENTINEL-1 INTERFEROMETRIC COHERENCE FOR LAND COVER AND VEGETATION MAPPING”. The project evaluates the performance of using the interferometric coherence of S-1 time series for land cover and vegetation mapping. One of the main objectives of the project is to quantify the impact in using...
We study an uplink multi-user massive Multiple-Input Multiple-Output (MIMO) system employing Semi-Orthogonal Multiple-Access (SOMA) scheme. Two achievable sum-rates for the SOMA scheme are presented by use of Minimum Mean-Square Error (MMSE) channel estimation and Maximum Ratio Combining (MRC) for data detection with two detection strategies; Single-User Detection (SUD) and Successive Interference...
In this study we propose an automatic algorithm that aims to map built-up areas by using two multi-temporal SAR features: the backscattering intensity and the InSAR coherence. The proposed algorithm is based on an adaptive parametric thresholding methodology and makes use of a hierarchical split-based approach. With this approach, the size of the tiles is not set a priori but, rather, tiles of variable...
In this paper, we present a new framework for the RGB composition of SAR data. The proposed processing chain aims at providing products particularly oriented toward the end-user community, thus characterized by a high degree of interpretability and by the possibility to be processed with simple algorithms for information extraction. The physical rationale of the proposed RGB products is presented...
Displacement Field Time Series (DFTS) are often derived from Satellite Image Time Series to study dynamic systems such as glaciers. This analysis can be performed with pattern-based data mining techniques that search DFTS for all possible displacement evolutions. Nevertheless, existing pattern oriented methods do not take into account the coherence measures coming along with such DFTS data. This paper...
Cross-correlations provide a useful technique to analyse the similarities between vegetation indices and time series of climatic variables. However, correlation analyses are not sufficient to unveil changes in the co-variability of vegetation and climate as a function of time or for different temporal scales. Here, we introduce the use of wavelet coherence to evaluate the relationship between vegetation...
On-demand single-photon sources that produce a single photon as a response to a deterministic input are widely regarded as critical light sources for quantum key distribution, quantum repeaters, and quantum information science generally [1]. The wavepackets from such a source must have low probability to contain more than one photon, exist in a pure state so they may interfere with one another, and...
We present a numerical study of the nonlinear dynamics of a population of coupled semiconductor lasers with saturable absorber operating in the excitable regime [1] and described by a set of coupled Yamada models [2]. In particular we have investigated the self-organized synchronization process taking place spontaneously among the lasers, showing significant correlations between the spike-like pulses...
Hollow-core photonic crystal fibers (HC-PCF) opened new perspectives towards multi-octave comb generation and waveform synthesis using stimulated Raman scattering (SRS) generation in gases introduced in its core [1, 2]. In the transient regime of SRS [3], a short pump pulse combined to a high gain can amplify a few spatial-temporal modes (STM) from the quantum noise. It is even possible to have only...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.