Realización electrónica de sistemas caóticos: Parte 3, en sistemas digitales

In the first parts of this work, the electronic realization with analog circuits of some continuous quadratic and piecewise linear chaotic systems was shown, using circuits with operational amplifiers and other components, as well as the equivalence of their electronic variables with the established mathematical models. In this third part, discretization of dynamic systems is applied for the implementation of these chaotic systems in the Arduino open-source platform, thus offering simplicity and versatility for digital applications. Finally, results of its chaotic behavior and numerical equivalence with continuous mathematical models are illustrated.En las primeras partes de este trabajo, se mostró la realización electrónica con circuitos analógicos de algunos sistemas caóticos continuos cuadráticos y lineales por tramos, mediante circuitos con amplificadores operacionales y otros componentes, así como la equivalencia de sus variables electrónicas con los modelos matemáticos establecidos. En esta tercera parte, se aplica discretización de sistemas dinámicos para la implementación de estos sistemas caóticos en la plataforma de código abierto Arduino, ofreciendo así simplicidad y versatilidad para aplicaciones digitales. Finalmente, se ilustran resultados de su comportamiento caótico y equivalencia numérica con los modelos matemáticos continuos

Realización electrónica de sistemas caóticos: Parte 1, Analógicos cuadráticos

Algunas aplicaciones de sistemas caóticos requieren su implementación mediante electrónica analógica o digital. En esta primera parte, se resume la realización electrónica de algunos sistemas caóticos más conocidos con no linealidades cuadráticas, mediante circuitos con multiplicadores y amplificadores operacionales. Se demuestra la equivalencia de sus variables y componentes electrónicos con las variables y parámetros normalizados de los modelos matemáticos caóticos. Además, se compara el comportamiento de cada circuito con simulaciones de sus modelos matemáticos establecidos. En las siguientes partes de este trabajo, se mostrará la realización electrónica de sistemas caóticos lineales por tramos e implementación en dispositivos digitales

Realización electrónica de sistemas caóticos: Parte 1, Analógicos cuadráticos

Some applications of chaotic systems require their implementation through analog or digital electronics. In this first part, the electronic realization of some well-known chaotic systems with quadratic nonlinearities is summarized, by means of circuits with multipliers and operational amplifiers. The equivalence of its variables and electronic components with the normalized variables and parameters of chaotic mathematical models is demonstrated. In addition, the behavior of each circuit is compared to simulations of their mathematical models. In the following parts of this work, the electronic realization of piecewise linear chaotic systems and implementation in digital devices will be shown.Algunas aplicaciones de sistemas caóticos requieren su implementación mediante electrónica analógica o digital. En esta primera parte, se resume la realización electrónica de algunos sistemas caóticos más conocidos con no linealidades cuadráticas, mediante circuitos con multiplicadores y amplificadores operacionales. Se demuestra la equivalencia de sus variables y componentes electrónicos con las variables y parámetros normalizados de los modelos matemáticos caóticos. Además, se compara el comportamiento de cada circuito con simulaciones de sus modelos matemáticos establecidos. En las siguientes partes de este trabajo, se mostrará la realización electrónica de sistemas caóticos lineales por tramos e implementación en dispositivos digitales

A New Simple Chaotic Lorenz-Type System and Its Digital Realization Using a TFT Touch-Screen Display Embedded System

This paper presents a new three-dimensional autonomous chaotic system. The proposed system generates a chaotic attractor with the variation of two parameters. Analytical and numerical studies of the dynamic properties to generate chaos, for continuous version (CV) and discretized version (DV), for the new chaotic system (NCS) were conducted. The CV of the NCS was implemented by using an electronic circuit with operational amplifiers (OAs). In addition, the presence of chaos for DV of the NCS was proved by using the analytical and numerical degradation tests; the time series was calculated to determine the behavior of Lyapunov exponents (LEs). Finally, the DV of NCS was implemented, in real-time, by using a novel embedded system (ES) Mikromedia Plus for PIC32MX7 that includes one microcontroller PIC32 and one thin film transistor touch-screen display (TFTTSD), together with external digital-to-analog converters (DACs)

Machine Learning in Sensors and Imaging

Machine learning is extending its applications in various fields, such as image processing, the Internet of Things, user interface, big data, manufacturing, management, etc. As data are required to build machine learning networks, sensors are one of the most important technologies. In addition, machine learning networks can contribute to the improvement in sensor performance and the creation of new sensor applications. This Special Issue addresses all types of machine learning applications related to sensors and imaging. It covers computer vision-based control, activity recognition, fuzzy label classification, failure classification, motor temperature estimation, the camera calibration of intelligent vehicles, error detection, color prior model, compressive sensing, wildfire risk assessment, shelf auditing, forest-growing stem volume estimation, road management, image denoising, and touchscreens

Managing the cross-industry networks of the audiovisual sector: a perspective from the independent screen productions in the UK and Taiwan

The thesis is a qualitative account of the much neglected issues of the bottom-up, and interconnected organization of the Cross-Industry Network (CIN) phenomena within the Audiovisual Sector (AVS). The aims are achieved by exploring the why and how of the independent screen content producers in developing CIN during the production process. By conceptualizing the CIN phenomenon as a Complex Adaptive System (CAS), I used its theories as analogies to analyze the multi-case and multi-level studies conducted at two scenarios of independent TV production sector in the UK/ the developed, and the independent film production sector in Taiwan/the developing. My research produced the following four conclusions. 1. From Top-Down Industry Disintegration to Bottom-up Production Reconfiguration The industrial disintegration of the media industry has resulted in the reconfiguration of content production networks and intense self-adaptation of creative producers who are facing multi-directional connections within the CIN during their production process. Such adaptation reveals tensions between the producers’ self-perception as ‘independent’ and ‘creative’ producers and their networking decisions and actions. 2. From Managing the Creative Project to Managing the Creative and Commercial Venture The evolution of the CIN in the creative and media production is not entirely top-down/linear/serial, but more accurately, bottom-up/ non-linear/parallel. These internal self-organizing dynamics enable the production network to radiate outwardly, which induces trade-offs between and beyond commercial and creative priorities. 3. From Distribution-led Value System to Production-led Microcosm The production process has evolved its own diverse CIN, involving different types of relationships, a higher degree of complexity and structural tensions inherent in the value-creating system. Such production-led networking functions are the most fundamental source for developing broader CIN and the economic return for creative producers. 4. From Network Adaptation to Complex Adaptive System The networking activities of independent and creative producers radiate and interact outwards to connect and affect all levels of the network, resulting in unexpected directions and complex collaborations. In particular, the elements of multi-directional adaptation and tensions of the involved network actors have an important impact on the emergence and organization of the network. The main contributions of the research are firstly to have taken a bottom-up analysis by integrating the micro-level organizational complexity of the independent production into the theorizing about the AVS; and secondly, to have placed the intangible values and real practice of creative producers at the centre of the network study

Museum, memories and digital stories : A liminal space for human computer interaction.

Objects, material or digital, mediate memories: they act as anchors in between temporal notions and relations of past and present. Through those objects of memory, the act of remembering occurs neither completely relived in the mind, nor fully captured in the medium. Essential to personal memories, objects represent also our collective memory and capture our social history.The papers submitted for this PhD by selected publications look at the design of innovative technology that can make remembering more evocative and affective. They look at both museums, where digital and material are combined in an augmented reality, and personal/family contexts, where the home and mundane objects can be technologically enhanced to encapsulate digital memories.The museum was ideal to experiment with hybrid settings that combine material (the collection and the architectural space) and digital (the information) (papers 1 to 3). Personalization of information was used to augment the reality of rooms and exhibits: whole body interaction (i.e. physical movements in the space) was used to select and personalize the content and engage visitors with both material (the object) and digital (the information). Although the mobile technology is dated, these papers show the value of combining digital and physical to provide a holistic experience that made visitors wonder. Where the fusion occurs, however, is in the digital technology. To balance this perspective, paper 4 looks at the effect of taking the digital content out into the exhibition space. My recent research (papers 5-9) looks at objects of memory in the personal realm, in particular in the family home. Starting from observing the role and function of mementos, I conclude that a more holistic and organic approach has to be taken to make personal digital objects of memory more present in people's life. Materialization can be achieved with digital devices designed for individual and family use, so that the product fits with the mundane aspects of life, is immediate, and stimulates affect, not efficiency.Finally papers 10 and 11 provide evidence of the innovative methodologies I have developed and successfully used in iterative user studies and evaluations across different research projects and many years of research. As a whole this submission shows that there is a huge design space to explore in looking at how technology could be used in public or private spaces to bring together the two aspects of memory: remembering in the mind and capturing through objects, in order to preserve our digital life as tangible interactive objects

Benelux meeting on systems and control, 23rd, March 17-19, 2004, Helvoirt, The Netherlands

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