Search results for " CIRCuiTS"
showing 7 items of 187 documents
Single Event Transients and Pulse Quenching Effects in Bandgap Reference Topologies for Space Applications
2016
An architectural performance comparison of bandgap voltage reference variants, designed in a $0.18~\mu \text {m}$ CMOS process, is performed with respect to single event transients. These are commonly induced in microelectronics in the space radiation environment. Heavy ion tests (Silicon, Krypton, Xenon) are used to explore the analog single-event transients and have revealed pulse quenching mechanisms in analogue circuits. The different topologies are compared, in terms of cross-section, pulse duration and pulse amplitude. The measured results, and the explanations behind the findings, reveal important guidelines for designing analog integrated circuits, which are intended for space appli…
Min-Type Control Strategy of a DC-DC Synchronous Boost Converter
2019
International audience; This paper presents the analysis and design of a min-type strategy to control a synchronous boost converter in continuous conduction mode. The strategy uses a nonlinear switching surface to establish the change of topology in the converter and is analyzed by means of a sliding-mode control approach. Subsequently, the min-type strategy is modified by a hybrid control formulation, which introduces a hysteresis width and a dwell-time to obtain a finite switching frequency in the start-up and steady-state respectively. The hybrid control formulation is implemented digitally by means of a microprocessor which processes the samples of inductor current and capacitor voltage…
Exploring students’ identity development from the perspective of study difficulties
2020
This work-in-progress paper in research category reports preliminary findings on how students taking introductory computing courses develop identity from the perspective of study difficulties. The motivation was that students identified lack of meaning and prospects (cf. identity) as a study difficulty in a previous qualitative study. The present study further explores this finding by issuing both an identity development and a self-efficacy scale to a larger first-year student cohort. The aim is to characterize the study cohort by the aspects included in the identity development scale, and thereby increase understandings of students’ challenges. Moreover, a correlation analysis between iden…
Linear Types for Higher Order Processes with First Class Directed Channels
1995
Abstract We present a small programming language for distributed systems based on message passing processes. In contrast to similar languages, channels are one-to-one connections between a unique sender and a unique receiver process. Process definitions and channels are first class values and the topology of process systems can change dynamically. The operational semantics of the language is defined by means of graph rewriting rules. A static type system based on the notion of linear types ensures that channels are always used as one-to-one connections.
Creativity by copying: imitating life as a work of imagination
2021
Engineering biological systems is easily interpretable as a process of mere and cold replication, or even distortion, of the natural domain, since it is often linked to industry and built on the Cartesian assumption of human rationality’s control over asubmissive nature. In this article, I approach living systems design from an alternative perspective, supporting its similarities with activities which are traditionally associated with creativity, like arts. I show that different kinds of creativity are deeply involved in copying, composing, and modifying life, focusing on two different levels: that of scientific modelling, recognisable by looking at biological circuits design, and that of a…
Synchronization of hidden chaotic attractors on the example of radiophysical oscillators
2017
In the present paper we consider the problem of synchronization of hidden and self-excited attractors in the context of application to a system of secure communication. The system of two coupled Chua models was studied. Complete synchronization was observed as for self-excited, as hidden attractors. Beside it for hidden attractors some special type of dynamic was revealed.
Rhythmic Memory Consolidation in the Hippocampus
2022
Functions of the brain and body are oscillatory in nature and organized according to a logarithmic scale. Brain oscillations and bodily functions such as respiration and heartbeat appear nested within each other and coupled together either based on phase or based on phase and amplitude. This facilitates communication in wide-spread neuronal networks and probably also between the body and the brain. It is a widely accepted view, that nested electrophysiological brain oscillations involving the neocortex, thalamus, and the hippocampus form the basis of memory consolidation. This applies especially to declarative memories, that is, memories of life events, for example. Here, we present our vie…