Introducing usability in a conceptual modeling-based software development process.

Usability plays an important role to satisfy users? needs. There are many recommendations in the HCI literature on how to improve software usability. Our research focuses on such recommendations that affect the system architecture rather than just the interface. However, improving software usability in aspects that affect architecture increases the analyst?s workload and development complexity. This paper proposes a solution based on model-driven development. We propose representing functional usability mechanisms abstractly by means of conceptual primitives. The analyst will use these primitives to incorporate functional usability features at the early stages of the development process. Following the model-driven development paradigm, these features are then automatically transformed into subsequent steps of development, a practice that is hidden from the analyst.

Optical digital chaos cryptography

In this work we present a new way to mask the data in a one-user communication system when direct sequence - code division multiple access (DS-CDMA) techniques are used. The code is generated by a digital chaotic generator, originally proposed by us and previously reported for a chaos cryptographic system. It is demonstrated that if the user's data signal is encoded with a bipolar phase-shift keying (BPSK) technique, usual in DS-CDMA, it can be easily recovered from a time-frequency domain representation. To avoid this situation, a new system is presented in which a previous dispersive stage is applied to the data signal. A time-frequency domain analysis is performed, and the devices required at the transmitter and receiver end, both user-independent, are presented for the optical domain.

Optical regeneration based on noise generated in bistable devices: going from 2R to 3R

In this paper we propose to employ an instability that occurs in bistable devices as a control signal at the reception stage to generate the clock signal. One of the adopted configurations is composed of two semiconductor optical amplifiers arranged in a cascaded structure. This configuration has an output equivalent to that obtained from Self-Electrooptic Effect Devices (SEEDs), and it can implement the main Boolean functions of two binary inputs. These outputs, obtained from the addition of two binary signals, show a short spike in the transition from "1" to "2" in the internal processing. A similar result is obtained for a simple semiconductor amplifier with bistable behavior. The paper will show how these structures may help recover clock signals in any optical transmission system

Extended phone log-likelihood ratio features and acoustic-based I-vectors for language recognition

This paper presents new techniques with relevant improvements added to the primary system presented by our group to the Albayzin 2012 LRE competition, where the use of any additional corpora for training or optimizing the models was forbidden. In this work, we present the incorporation of an additional phonotactic subsystem based on the use of phone log-likelihood ratio features (PLLR) extracted from different phonotactic recognizers that contributes to improve the accuracy of the system in a 21.4% in terms of Cavg (we also present results for the official metric during the evaluation, Fact). We will present how using these features at the phone state level provides significant improvements, when used together with dimensionality reduction techniques, especially PCA. We have also experimented with applying alternative SDC-like configurations on these PLLR features with additional improvements. Also, we will describe some modifications to the MFCC-based acoustic i-vector system which have also contributed to additional improvements. The final fused system outperformed the baseline in 27.4% in Cavg.

L'Agricoltura coloniale.

anno 17

L'Agricoltura coloniale.

anno. 4

L'Agricoltura coloniale.

anno. 9 sem. 1

L'Agricoltura coloniale.

anno. 6

L'Agricoltura coloniale.

anno. 13

L'Agricoltura coloniale.

anno. 9 sem. 2

Memoria sull'origine e sullo sviluppo del progetto di condurre acqua potabile dal continente a Venezia /

Acquisition made accessible thanks to a 2015-2017 grant from the Council on Libraries and Information Resources.

Di alcuni strumenti musicali della Micronesia e della Melanesia regalati al Museo Nazionale d'Anthropologia e di Etnologia dal Dott. Otto Finsch /

Offprint: Archivio per l'antropologia e la etnologia. Vol. 17, fasc. 1.

Ginnasio di esperimento per i giovani compositori di musica : proposto dal maestro Giacomo Servadio e approvato dall'impresa già costituita.

Mode of access: Internet.

Il cimiterio di San Miniato al Monte /

Mode of access: Internet.

Historia dell'origine, fondatione, et progressi del famosissimo tempio di S. Maria delle Gratie, in campagna di Curtatone fuori di Mantoua : con la descrittione del monastero dignissimo, sue giurisdittioni, & altre attinenze della sopradetta Santa Casa /

Errata, p. [192].