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Publications (48)
In this paper we consider tourism data as influenced by a number of economic and political factors expressed in a set of parameters within a classical, but retouched, CAST model: tourism is a complex reality that needs a not-so-simple approach. Starting on a general scheme consisting of two destinations that feed upon a market of total population P...
We describe a model based on dynamic systems theory to analyse the behaviour and flows of travellers between tourist markets and competing destinations, including a qualitative application, distinguishing several situations (destinations in mild competition and destinations in strong competition), to the case study of Gran Canaria and Tenerife, two...
In this paper we will initially make a review of the ample and rich set of ideas found in [2, 3], but in the core of it we shall focus in the revision of concepts related to the bio-cybernetics of visual processes, artificial and machine vision and their consequences in the following 20 years, that is, from 1965 to 1985. In both cited references it...
The two-volume set LNCS 12013 and 12014 constitutes the thoroughly refereed proceedings of the 17th International Conference on Computer Aided Systems Theory, EUROCAST 2019, held in Las Palmas de Gran Canaria, Spain, in February 2019.
The 123 full papers presented were carefully reviewed and selected from 172 submissions. The papers are organized i...
The two-volume set LNCS 12013 and 12014 constitutes the thoroughly refereed proceedings of the 17th International Conference on Computer Aided Systems Theory, EUROCAST 2019, held in Las Palmas de Gran Canaria, Spain, in February 2019.
The 123 full papers presented were carefully reviewed and selected from 172 submissions. The papers are organized i...
EXTENDED ABSTRACT In the three-year period 1965-1967 a fruitful collaboration between NASA and the Instrumentation Laboratory Group at the Massachusetts Institute of Technology (IL-MIT), commanded by Dr. Warren McCulloch, took place. A series of reports, developed under a contract intended to build robotic devices to be "junket" (using W.S. McCullo...
It is normally accepted that the beginnings of modern computing connectionism can be traced to McCulloch and Pitts’ paper of 1943 [1]. The important points of their historical contributions are however mislead by the drift that developments on theoretical computer architectures took after the 50’s. The so called Artificial Neural Nets and subsequen...
The two-volume set LNCS 10671 and 10672 constitutes the thoroughly refereed proceedings of the 16th International Conference on Computer Aided Systems Theory, EUROCAST 2017, held in Las Palmas de Gran Canaria, Spain, in February 2017.
The 117 full papers presented were carefully reviewed and selected from 160 submissions. The papers are organized...
In this work, we provide an analysis of BLE channel-separate fingerprinting using different distance and similarity measures. In a 168 m\(^{2}\) testbed, 12 beacons with Eddystone and iBeacon protocols set were deployed, taking into account the orientation of users and considering 10 distance/similarity measures. We have observed that there is an o...
The class of flat triangular and layered nets of simple computing units, which gives rise to Newton and Hermite filters in two dimensions are extended to 3-D by means of two natural discrete ways. First, by means of the so called Pascal Pyramids; and second, by introducing a rectangular grilled “retina”, which leads to a kind of Newton quadrangular...
We explore the possibilities of Eulerian numbers to define weights in layered networks and model distributed computation at the level of neurons receptive fields. These networks are then compared to those defined by binomial coefficients (Newton filters). Their potential as structures for signals convergence, divergence and overlapping is also esta...
We recover and develop some robotic systems concepts (on the light of present systems tools) that were originated for an intended Mars Rover in the sixties of the last century at the Instrumentation Laboratory of MIT, where one of the authors was involved.
The basic concepts came from the specifications for a type of generalized robot inspired in t...
This paper explores the origins and content of Neurocybernetics and its links to Artificial Intelligence, Computer Science and Knowledge Engineering. Starting with three remarkable pieces of work, we center attention on a number of events that initiated and developed basic topics that are still nowadays a matter of research and inquire, from goal d...
The two-volume set LNCS 8111 and LNCS 8112 constitute the papers presented at the 14th International Conference on Computer Aided Systems Theory, EUROCAST 2013, held in February 2013 in Las Palmas de Gran Canaria, Spain. The total of 131 papers presented were carefully reviewed and selected for inclusion in the books. The contributions are organize...
Directional selectivity to local visual stimuli appears in various levels of the visual pathway, being in the retina very conspicuous. Neurophysiology suggests that directionality (as well as other local and quasi-global filtering properties) are based in the space–time interactions of processes with different “memory” (latency). We draw inspiratio...
The general aim is to formalize known properties of real neurons, formulating
them into appropriate mathematical models. These will converge into, hopefully,
more powerful neurophysiological founded distributed computation units of ar-
ti¯cial neural nets. Redundancy and distributed computation are key factors to
be embodied in the corresponding bi...
We propose analytical models for slow potentials transients as they are recorded at different layers of the retina, but mostly
as they are integrated to produce ganglion cells outputs. First, two possible pathways from photoreceptors to bipolars and
to ganglia are formulated, their formal equivalence being shown for quasi-linear behaviour. Secondly...
The realization of local space-time models of retinal processes can be achieved by means of available typical dynamical systems
simulation tools (like Simulink) because only a very small number of parallel channels is needed. In short, the aim is to simulate both the time and space
dimensions as delay chains, where the travelling signals are availa...
Directional sensitivity to local stimuli by retinal ganglion cells are related to processes which probably are located at the Inner Plexiform Layer of the retina, at the ganglion cells dendrites and it is the result of at least two mechanisms. First, at the ganglion dendrites, either by postsynaptic inhibition from amacrines or by presynaptic inhib...
Traditional interpretation of early visual image processing in a retinal level has focused exclusively on spatial aspects of receptive fields (RFs). We have learned recently that RFs are spatiotemporal entities and this characterization is crucial in understanding and modelling circuits in early visual processing ([1]). We present a generalization...
In this paper, we review McCulloch's legacy, from his early work in neurophysiology, and its relationship to his philosophical quest for an 'experimental epistemology' to his role in the cybernetics movement during the 1940s and 1950s and his contributions to the development of computer science and communication theory. There are three parts in chr...
Presynaptic Inhibition (PI) basically consists of the strong suppression of a neuron’s response before the stimulus reaches
the synaptic terminals mediated by a second, inhibitory, neuron. It has a long lasting effect, greatly potentiated by the
action of anaesthetics, that has been observed in motorneurons and in several other places of nervous sy...
Traditional interpretation of early visual image processing in a retinal level has focused exclusively on spatial aspects
of receptive fields (RFs). We have learned recently that RFs are spatiotemporal entities and this characterization is crucial
in understanding and modelling circuits in early visual processing ([2]). We present a generalization...
The ability to detect object size, location and movement is essential for a visual system in either a biological or man made environment. In this paper we present a model for estimating these parameters by using a set of randomly distributed receptive fields on a retina. This approach differs from more conventional ones in which the receptive field...
The concept of fast and slow signals interacting by non-linear lateral processing at the inner plexiform layer and its suitable
mathematical formulation, allows for a coherent interpretation of simple, complex and colour coding ganglion retinal cells
of various representative vertebrates. In its simplest formulation, the processing can be expressed...
Systems theoretical methods used to describe lower vertebrate retinal processing [1] can be extended to include models of
the amphibian tectum. Figure 1 is a diagram of the frog’s visual system with the eyes enlarged so that the ganglion cells
can be illustrated collecting information from the retina and conveying it to both the optic tectum and th...
This article is a first approach to the use of Rete algorithm to design a team of robotic soccer playing agents for Robocup Soccer Server. Rete algorithm is widely used to design rule-based expert systems. Robocup Soccer Server is a system that simulates 2D robotic soccer matches. The paper presents an architecture based on CM United team architect...
This paper presents some systems theoretical and computational tools which allow for qualitative and quantitative models to
explain the rate of firing (outputs) of ganglion retinal cells to various stimuli, mostly in higher vertebrates. Section 1
presents the neurophysiological bases of the formal tools, in which the main point is that specialized...
The different aspects of classical neural nets are treated here at the light of Systems Theory. First, we consider McCulloch-Pitts-Blum
formalisms, which are regarded as biological counterparts of logical machines (automata). Systems Theory inspired the introduction
of state transition and functional matrices, to treat problems of analysis, synthes...
Presynaptic Inhibition (PI) basically consists of the strong suppression of a neuron's response before the stimulus reaches the synaptic terminals mediated by a second, inhibitory, neuron. It has a long lasting effect, greatly potentiated by the action of anesthetics, that has been observed in motorneurons and in several other places of nervous sys...
This paper shows the interaction among the algebraic-analytical data fields theory, the complete descriptions that may be truncated for practical visual tasks and the different level of processing in the early visual pathway, in order to establish a measure of the representation of similarity between images. Our work is based on the approach of mod...
1)
We have studied in depth the Theory of Receptive Field Functinal Transformation, increasing their scope to situations of variable dimension partitions.
2)
We have developped a theorem which allows the Systematic generation of Complete Transform in the above case.
The analisys of the properties of specialized cells in the retina using concepts from Systems Theory allow us to exclude several retinal mechanisms in the generation of responses to spatial and temporal stimuli, suggesting other mechanisms as more probable. We need more experimentation to clarify the underlying mechanisms.
Concepts and methods in non-linear System Theory, developped according to the Volterra-Wiener formulation, are one of the effective system tools to analyze certain physiological systems, and they are made apparent by setting forth formulations and solutions of various research problems of different degrees of abstraction to identify the local nonli...
The importance of this, theorem rests in that it integrates the algebra and analysis of the data fields, stating that, given an algebraic partition with certain restrictions, them the computation of a number of analytical descriptors independently in each partition provide for a complete and non-redundant description of the data fields.
In the desi...