Acta Polytechnica Hungarica 

About: Acta Polytechnica Hungarica is an academic journal published by Óbuda University. The journal publishes majorly in the area(s): Computer science & Fuzzy logic. It has an ISSN identifier of 1785-8860. It is also open access. Over the lifetime, 594 publications have been published receiving 4936 citations.

Definition and synergies of cognitive infocommunications

Abstract: In this paper, we provide the finalized definition of Cognitive Infocommunications (CogInfoCom). Following the definition, we briefly describe the scope and goals of CogInfoCom, and discuss the common interests between CogInfoCom and the various research disciplines which contribute to this new field in a synergistic way.

Robust fixed point transformations in adaptive control using local basin of attraction

Abstract: A further step towards a novel approach to adaptive nonlinear control developed at Budapest Tech in the past few years is reported. This approach obviates the use of the complicated Lyapunov function technique that normally provides global stability of convergence at the costs of both formal and essential restrictions, by applying Cauchy sequences of local, bounded basin of attraction in an iterative control that is free of such restrictions. Its main point is the creation of a robust iterative sequence that only slightly depends on the features of the controlled system and mainly is determined be the control parameters applied. It is shown that as far as its operation is considered the proposed method can be located between the robust Variable Structure / Sliding Mode and the adaptive Slotine-Li control in the case of robots or other Classical Mechanical Systems. The operation of these method is comparatively analyzed for a wheel + connected mass system in which this latter component is "stabilized" along one of the spokes of the wheel in the radial direction by an elastic spring. The robustness of these methods is also investigated againts unknown external disturbances of quite significant amplitudes. The numerical simulations substantiate the superiority of the robust fixed point transformations in the terms of accuracy, simplicity, and smoothness of the control signals applied.

A unified terminology for the structure and semantics of CogInfoCom channels

Abstract: Due to its multidisciplinary origins, the elementary concepts and terminology of Cognitive Infocommunications (CogInfoCom) would ideally be derived – among others – from the fields of informatics, infocommunications and cognitive sciences. The terminology used by these fields in relation to CogInfoCom are disparate not only because the same concepts are often referred to using different terms, but also because in many cases the same terms can refer to different concepts. For this reason, we propose a set of concepts to help unify the CogInfoCom-related aspects in these fields, from the unique viewpoint necessary for the human-oriented analysis and synthesis of CogInfoCom channels. Examples are given to illustrate how the terminology presents itself in engineering applications.

Origins of surgical robotics: From space to the operating room

Abstract: The rapid development of telerobotic systems led to novel applications beyond the nuclear and industrial domains. Medical telerobotics enabled surgeons to perform medical operations from remote places, far from their patient. Telesurgery systems allow great flexibility, improved performance in general, and support the creation of ideal surgical conditions. The first attempts to develop telesurgical systems borrowed the idea from space research, where the need of novel robots emerged for invasive treatment, even under extremesituations, such as weightlessness. Telesurgical instruments on Earth appeared following the same concept, aiming first for military, then onward for civilian applications. Today, more than 1.5 million patients are receiving telerobotic treatment annually, worldwide. As the surgical robotics domain grew from the initial concepts, it developed along three major concepts: telesurgery, cooperatively controlled robots and automated (image-guided) applications. These domains continue to develop into application specific systems with the goal of reaching the specificity and versatility of conventional surgical instruments.

Active Knowledge for the Situation-driven Control of Product Definition

Abstract: The current product model consists of features and unstructured contextual connections in order to relate features. The feature modifies the previous state of the product model producing contextual connections with previously defined features. Active knowledge is applied for the adaptive modification of product model features in the case of a changed situation or event. Starting from this state-of-the-art, the authors of this paper introduced a new method to achieve higher-level and more advanced active feature driven product model definition. As part of the related research program, new situation driven model definition processes and model entities are explained in this paper. Higher-level knowledge representation in the product model is motivated by a recent trend in industrial product modeling systems towards more advanced and efficient situation-based self- adaptive model generation. The proposed model represents one of the possible future ways of product model development for product lifecycle management (PLM) systems on the global or product level of decisions. Its implementation will be new application-oriented model entity generation and representation utilizing existing modeling resources in industrial PLM systems by use of application programming interfaces (API).