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Accurate detection of pause boundary plays a major role in the segmentation of the speech corpus and improving the quality of speech synthesis. For pause modelling, we need to have pause tags in the training sentences. Manual tagging of pause is accurate but have the possibilities of missing out due to human error, and it is time-consuming. In this work, an automatic approach for marking the pause...
RSA and Elliptic Curve Cryptography (ECC) are the most common public cryptographic algorithms for encryption of symmetric keys which are used in https protocol and for digital signatures. The beauty of using ECC instead of using RSA is that machines which make use of ECC are likely to consume less system resources thereby ameliorating the performance of the machines. In this paper, we experimentally...
Creating a highly accurate pronunciation dictionary plays an important role in building English TTS system to produce high quality synthesised speech. Majority of the existing studies related to building Indian English TTS systems adapt CMU pronunciation dictionary to corresponding target Indian accent. Majority of these studies use hand-crafted rule-based approaches to adapt to the target language...
Majority of the social network analysis studies for counter-terrorism and homeland security consider homogeneous network. However, a terrorist activity (attack) is often defined by several attributes such as terrorist organisation, time, place, attack type etc. To capture inherent dependency between the attributes, we need to adopt a network which is capable of capturing the dependency between the...
Existing studies on evolution of social network largely focus on addition of new nodes and links in the network. However, as network evolves, existing relationships degrade and break down, and some nodes go to hibernation or decide not to participate in any kind of activities in the network where it belongs. Such nodes and links, which we refer as "dull", may affect analysis and prediction...
Elliptic curves in the geometric and algebraic parlances have been studied by computer scientists over the last few decades. Elliptic Curve Cryptography or Cryptosystem (ECC) is a public-key cryptosystem. The main advantage and benefit of using ECC instead of using RSA is that it gives equivalent security for a smaller key, thereby consuming less resource and ameliorating performance on the systems...
Elliptic curve cryptosystem has been heavily studied by computer scientists for many decades. This form of cryptosystem is based on elliptic curves over some Galois fields. Elliptic Curve Cryptography or Cryptosystem (ECC) is a public-key cryptosystem that makes use of public and private key pairs as a means of encrypting and decrypting information in the internet. The critical security of ECC relies...
Social network analysis (SNA) has been effectively used in counter-terrorism analysis by generating homogeneous network. In this paper, we consider a large dataset reporting various terrorist attacks over the globe and represent the dataset as a heterogeneous network. The objective of this paper is to the explore the effect of various link prediction frameworks such as topic modeling, network topology...
The main motivation of this work is to evaluate performance and characteristics of a 6.5kV SiC Thyristor based current switch (series connected active switch and diode). A unique series resonant testing circuit has been proposed to characterize this switch. The device has been tested in several soft and hard turn on and off transitions. Conceptual simulation and hardware results have been presented...
Collector-Emiter blocking voltages of 10.5 kV (91% of theoretical avalanche limit and 125 V/μm), on-resistance of 110 mΩ-cm2, which is close to the unipolar limit of 94 mΩ-cm2, and current gain as high as 75 are measured on 10 kV SiC BJTs. Monolithic Darlington-connected BJTs fabricated on the same wafer yield current gains as high as 3400, and show Si BJT-like output characteristics in the saturation...
1700 V/20 mΩ SiC Junction Transistors (SJTs) were recently released by GeneSiC with specific on-resistance as low as 2.3 mΩ-cm2, and current gain > 100. This paper benchmarks the electrical characteristics of the 1700 V SJTs against two best-in-class Si IGBTs. The SJT features 47% and 49% lower on-state voltage drops than the two Si IGBTs, respectively, with the SJT operating at 175°C, and the...
Short-circuit (SC) robustness of 1200 V-rated SiC npn Junction Transistors (SJTs) and commercial power DMOSFETs is investigated. Due to low overdrive base currents and low short-circuit currents the absence of short-channel effects, SJTs demonstrate superior SC capability including: (a) minimum short-circuit withstand time (tSc) of 14 μs, even at Vds=1000 V (b) Perfectly stable output and blocking...
A comprehensive evaluation of high-temperature (up to 200°C) on-state, blocking voltage and switching operation of 1200 V-class SiC Junction Transistors (SJTs) with on-chip integrated Schottky rectifiers is presented in this paper. The SJTs feature current gains of 69 and on-resistance of 6.3 mΩ-cm2 at room-temperature. The integrated free-wheeling Schottky rectifier displays a 0.9 V knee voltage...
This paper revisits the spectral based link prediction problem of evolutionary social networks reported in [9] and focuses on addressing two empirically observed issues which affect the prediction performance. First, the assumption that eigenvectors are constant over time is not valid for lower order eigenvectors and eigenvectors evolve over time as network evolves. A regression based method is proposed...
In this paper, we discuss a consortium effort on building text to speech (TTS) systems for 13 Indian languages. There are about 1652 Indian languages. A unified framework is therefore attempted required for building TTSes for Indian languages. As Indian languages are syllable-timed, a syllable-based framework is developed. As quality of speech synthesis is of paramount interest, unit-selection synthesizers...
India is home to about 1600 languages. Less than 5% of this population is English literate. A consortium effort on developing a common framework to build text-to-speech synthesis (TTS) in various Indian languages has already been realized. In this paper, we propose a parallel effort to integrate the various TTS systems developed into various applications. These applications are primarily aimed at...
A physics based compact model for SiC Junction Barrier Schottky (JBS) diodes is presented which features a comprehensive physical description of the DC and CV behavior of SiC JBS diodes. For the first time, modeling of leakage current for JBS diode in circuit simulation is done. The model includes temperature scaling of its parameters to enable modeling of the diodes over a wide range of temperature...
This paper reports on ultra-high voltage, >15 kV SiC PiN rectifiers exhibiting >95% of the avalanche rating and 115 V/μm. This is one of a few reports on > 15 kV blocking voltages measured on any single semiconductor device, and the highest percentage of the avalanche limit ever reported on devices fabricated on > 100 μm thick SiC epilayers. Excellent stability of on-state voltage drop...
Open-base breakdown voltages as high as 10.5 kV (91% of theoretical avalanche limit and 125 V/μm), on-resistance of 110 mΩ-cm2 close to the unipolar limit of 94 mΩ-cm2, and current gain as high as 75 are measured on 10 kV-class SiC BJTs. Monolithic Darlington-connected BJTs fabricated on the same wafer yield current gains as high as 3400, and show Si BJT-like output characteristics with a differential...
Electrical Characteristics of Industry's first commercially available 1200 V rated SiC Schottky rectifiers, specially designed for operation at ≥ 250 °C are presented. These high-temperature SiC rectifiers fabricated in 1, 5, and 20 A current ratings feature reverse leakage currents of < 3 mA/cm2 at 1200 V up to temperatures as high as 300 °C. GeneSiC's 1200 V/20A High Temperature Schottky (designated...
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