Es wird zunehmend erkannt, daß es für Unternehmen von strategischer Bedeutung sein kann, Dokumente nicht nur als fortlaufenden Text zu betrachten, sondern als Objekte mit einer wohldefinierten logischen Struktur. Darüber hinaus ist es häufig für eine qualitativ befriedigende Lösung von Informationsproblemen notwendig oder wünschenswert, Dokumente auch inhaltlich aufzubereiten und im Hinblick au...

Targeted Hypernym Discovery (THD) applies lexico-syntactic (Hearst) patterns on a suitable corpus with the intent to extract one hypernym at a time. Using Wikipedia as the corpus in THD has recently yielded promising results in a number of tasks. We investigate the reasons that make Wikipedia articles such an easy target for lexicosyntactic patterns, and suggest that it is primarily the adheren...

This paper presents a compact low-power bidirectional current mirror suitable for low-voltage applications. The key element is the use of a CMOS complementary input stage working in subthreshold regime; which allows setting a reduced bias current through the mirror. The circuit was simulated using LTSpice and presents class AB operation with a THD of 1% at 1MHz. The power consumption is close t...

A trojan is a type of malicious software (globally known as malware) that is either packaged along with a useful piece of software or pretends to be a piece of useful software itself. Once a trojan is activated, which usually goes unnoticed by the user, it releases a payload such as a virus or a backdoor that may allow a remote user to gain access to the system.2,3 A popular means of infection ...

For medium voltage, high power applications 3-phase neutral point clamped AC-DC multilevel converters are becoming a good choice. In this paper the performance of a 3-phase neutral point clamped Active Front End three level converter for high power application with simplified control scheme is presented. A complete mathematical model of the control scheme is developed and performance is investi...

A low-voltage, low-power four-quadrant analog multiplier with optimized current-efficiency is presented. Its core corresponds to a pseudodifferential cascode, gain-boosting triodetransconductor. According to a low-voltage 1.2μm CMOS n-well process, operand differential-amplitudes are 1.0Vpp and 0.32Vpp for a 1.3V-supply. Common-mode voltages are properly chosen to maximize current-efficiency to...

Multilevel Converters are known to have many advantages for electricity network applications. In particular Cascaded H-Bridge Converters are attractive because of their inherent modularity and scalability. Predictive control for power converters is advantageous as a result of its applicability to discrete system and fast response. In this paper a novel control technique, named Modulated Model P...

A new topology for a LVLP variable-gain CMOS amplifier is presented. Inputand load-stage are built around triode-transconductors so that voltage-gain is fully defined by a linear relationship involving only device-geometries and biases. Excellent gain-accuracy, temperature-insensitivity and wide range of programmability are thus achieved. Moreover, adaptative biasing improves the common-mode vo...

This paper presents analysis, modeling, and design of a low-harmonic, isolated, active-clamped SEPIC rectifier for future avionics applications. Simpler converter dynamics, high switching frequency, zerovoltage-switching, and a single-layer transformer construction result in an efficiency of 90% and a very low total harmonic distortion over 400 -800 Hz line frequency variation.