scholarly journals Sensorimotor Self-organization via Circular-Reactions

2021 ◽  
Vol 15 ◽  
Author(s):  
Dongcheng He ◽  
Haluk Ogmen
Keyword(s):  
Visual Processing ◽  
Reference Frames ◽  
Three Dimensional ◽  
Self Organization ◽  
Motor Systems ◽  
Sensory Inputs ◽  
Spatial Environment ◽  
Motor Activities ◽  
Motor Actions ◽  
Vector Representations

Newborns demonstrate innate abilities in coordinating their sensory and motor systems through reflexes. One notable characteristic is circular reactions consisting of self-generated motor actions that lead to correlated sensory and motor activities. This paper describes a model for goal-directed reaching based on circular reactions and exocentric reference-frames. The model is built using physiologically plausible visual processing modules and arm-control neural networks. The model incorporates map representations with ego- and exo-centric reference frames for sensory inputs, vector representations for motor systems, as well as local associative learning that result from arm explorations. The integration of these modules is simulated and tested in a three-dimensional spatial environment using Unity3D. The results show that, through self-generated activities, the model self-organizes to generate accurate arm movements that are tolerant with respect to various sources of noise.

scholarly journals Radial Turbine Design for Solar Chimney Power Plants

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 674
Author(s):  
Paul Caicedo ◽  
David Wood ◽  
Craig Johansen
Keyword(s):  
Power Plants ◽  
Reference Frames ◽  
Three Dimensional ◽  
Discrete Ordinates ◽  
Large Area ◽  
Solar Chimney ◽  
Cfd Simulations ◽  
Radial Turbine ◽  
Design Changes ◽  
Turbine Design

Solar chimney power plants (SCPPs) collect air heated over a large area on the ground and exhaust it through a turbine or turbines located near the base of a tall chimney to produce renewable electricity. SCPP design in practice is likely to be specific to the site and of variable size, both of which require a purpose-built turbine. If SCPP turbines cannot be mass produced, unlike wind turbines, for example, they should be as cheap as possible to manufacture as their design changes. It is argued that a radial inflow turbine with blades made from metal sheets, or similar material, is likely to achieve this objective. This turbine type has not previously been considered for SCPPs. This article presents the design of a radial turbine to be placed hypothetically at the bottom of the Manzanares SCPP, the only large prototype to be built. Three-dimensional computational fluid dynamics (CFD) simulations were used to assess the turbine’s performance when installed in the SCPP. Multiple reference frames with the renormalization group k-ε turbulence model, and a discrete ordinates non-gray radiation model were used in the CFD simulations. Three radial turbines were designed and simulated. The largest power output was 77.7 kW at a shaft speed of 15 rpm for a solar radiation of 850 W/m2 which exceeds by more than 40 kW the original axial turbine used in Manzanares. Further, the efficiency of this turbine matches the highest efficiency of competing turbine designs in the literature.

In-Between and Through: Architecture and Complexity

2005 ◽  
Vol 3 (3) ◽  
pp. 335-354 ◽  
Author(s):  
Clarissa Ribeiro Pereira de Almeida ◽  
Anja Pratschke ◽  
Renata La Rocca
Keyword(s):  
Complex System ◽  
Software Engineering ◽  
Complex Systems ◽  
Design Process ◽  
Three Dimensional ◽  
Self Organization ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Complex Thought ◽  
Basic Characteristics

This paper draws on current research on complexity and design process in architecture and offers a proposal for how architects might bring complex thought to bear on the understanding of design process as a complex system, to understand architecture as a way of organizing events, and of organizing interaction. Our intention is to explore the hypothesis that the basic characteristics of complex systems – emergence, nonlinearity, self-organization, hologramaticity, and so forth – can function as effective tools for conceptualization that can usefully extend the understanding of the way architects think and act throughout the design process. To illustrate the discussions, we show how architects might bring complex thought inside a transdisciplinary design process by using models such as software engineering diagrams, and three-dimensional modeling network environments such as media to integrate, connect and ‘trans–act’.

scholarly journals Projecting Facilities for Power Exercise Teaching System.

2018 ◽  
pp. 1082-1087
Author(s):  
Rustam A. Aydarov ◽  
Irina G. Kalina ◽  
Nuriya Kh. Gzhemskaya
Keyword(s):  
Motor Skills ◽  
Training System ◽  
Educational Process ◽  
Teaching Aids ◽  
Effective Training ◽  
Motor Activities ◽  
Motor Actions ◽  
Educational Conditions ◽  
Theoretical Foundations

In the context of modern educational conditions, it becomes actual to solve the problem of preparation of such teaching aids that would act as an integral tool of the pedagogical technology of effective training in power exercises. The aim of the article is to present the results of the analysis of modern requirements for the didactic projection of teaching aids, to justify the demand for their design and to present a project for the integrated use of didactic tools in the training of power exercises. The study used a method of theoretical analysis and generalization of scientific and methodological literature on the issues reflecting the state of the problem of the didactic facilities projection, the theoretical foundations of training motor activities, the problems of creating and using didactic means for teaching motor activities. To determine the efficiency of the traditional methods of teaching power exercises a pedagogical experiment was established. 34 girls and 47 boys participated in the experiment. The results which showed the quality of learning the orienting basis for motor actions were obtained by testing. Results of the study. The modern requirements of the theory of projecting teaching aids indicate the need for a comprehensive design and reflection of the components of the implemented didactic system in the teaching facilities, namely: the purpose of training, the content of training, the learning process itself and organizational forms of education. Projecting these elements in accordance with the requirements presented in the theory makes it possible to implement a pre-designed didactic system in practice. The analysis of the theoretical bases of teaching motor actions shows that the process of mastering knowledge of motor actions as an indicative basis for carrying out these actions is of primary importance for developing motor skills and abilities. The obtained results of power exercises training system according to the traditional method showed the following: 70.2% of young men and 84.3% of girls reached the first level of learning the orienting basis of motor actions in power training. Indicators of the second level of learning were extremely low: only 5% of boys and 18.7% of girls reached it. The project has been created for training motor activities using such didactic facilities as an electronic educational resource and instruction cards. Each facility has its own functions in providing the stages of the educational and cognitive cycle, the use of which is designed depending on the way the group of students are organized, the forms of the educational process organization.

scholarly journals An internal model approach for motor behavior

2021 ◽  
Vol 15 (5) ◽  
pp. 356-371
Author(s):  
Cláudio M. F. Leite ◽  
Carlos E. Campos ◽  
Crislaine R. Couto ◽  
Herbert Ugrinowitsch
Keyword(s):  
Motor Skills ◽  
Internal Model ◽  
Motor Behavior ◽  
External World ◽  
Internal Models ◽  
Sensory Inputs ◽  
Theoretical Approaches ◽  
Internal Coherence ◽  
Motor Actions ◽  
Model Approach

Interacting with the environment requires a remarkable ability to control, learn, and adapt motor skills to ever-changing conditions. The intriguing complexity involved in the process of controlling, learning, and adapting motor skills has led to the development of many theoretical approaches to explain and investigate motor behavior. This paper will present a theoretical approach built upon the top-down mode of motor control that shows substantial internal coherence and has a large and growing body of empirical evidence: The Internal Models. The Internal Models are representations of the external world within the CNS, which learn to predict this external world, simulate behaviors based on sensory inputs, and transform these predictions into motor actions. We present the Internal Models’ background based on two main structures, Inverse and Forward models, explain how they work, and present some applicability.

Equivalent Circuits of the Elastic Field

1944 ◽  
Vol 11 (3) ◽  
pp. A149-A161
Author(s):  
Gabriel Kron
Keyword(s):  
Steady State ◽  
Reference Frames ◽  
Three Dimensional ◽  
Elastic Field ◽  
Companion Paper ◽  
Theory Of Elasticity ◽  
Equivalent Circuits ◽  
Two Dimensional ◽  
Arbitrary Boundary ◽  
Nonlinear Stress

Abstract This paper presents equivalent circuits representing the partial differential equations of the theory of elasticity for bodies of arbitrary shapes. Transient, steady-state, or sinusoidally oscillating elastic-field phenomena may now be studied, within any desired degree of accuracy, either by a “network analyzer,” or by numerical- and analytical-circuit methods. Such problems are the propagation of elastic waves, determination of the natural frequencies of vibration of elastic bodies, or of stresses and strains in steady-stressed states. The elastic body may be non-homogeneous, may have arbitrary shape and arbitrary boundary conditions, it may rotate at a uniform angular velocity and may, for representation, be divided into blocks of uneven length in different directions. The circuits are developed to handle both two- and three-dimensional phenomena. They are expressed in all types of orthogonal curvilinear reference frames in order to simplify the boundary relations and to allow the solution of three-dimensional problems with axial and other symmetry by the use of only a two-dimensional network. Detailed circuits are given for the important cases of axial symmetry, cylindrical co-ordinates (two-dimensional) and rectangular co-ordinates (two- and three-dimensional). Nonlinear stress-strain relations in the plastic range may be handled by a step-by-step variation of the circuit constants. Nonisotropic bodies and nonorthogonal reference frames, however, require an extension of the circuits given. The circuits for steady-state stress and small oscillation phenomena require only inductances and capacitors, while the circuits for transients require also standard (not ideal) transformers. A companion paper deals in detail with numerical and experimental methods to solve the equivalent circuits.

Real-Time Analysis of Human Body Parts and Gesture-Activity Recognition in 3D

2011 ◽  
pp. 130-174
Author(s):  
Burak Ozer ◽  
Tiehan Lv ◽  
Wayne Wolf
Keyword(s):  
Real Time ◽  
Activity Recognition ◽  
Visual Processing ◽  
Visual Analysis ◽  
Three Dimensional ◽  
Real Time Processing ◽  
Visual Reconstruction ◽  
Three Dimensional Models ◽  
Main Components ◽  
Processing Techniques

This chapter focuses on real-time processing techniques for the reconstruction of visual information from multiple views and its analysis for human detection and gesture and activity recognition. It presents a review of the main components of three-dimensional visual processing techniques and visual analysis of multiple cameras, i.e., projection of three-dimensional models onto two-dimensional images and three-dimensional visual reconstruction from multiple images. It discusses real-time aspects of these techniques and shows how these aspects affect the software and hardware architectures. Furthermore, the authors present their multiple-camera system to investigate the relationship between the activity recognition algorithms and the architectures required to perform these tasks in real time. The chapter describes the proposed activity recognition method that consists of a distributed algorithm and a data fusion scheme for two and three-dimensional visual analysis, respectively. The authors analyze the available data independencies for this algorithm and discuss the potential architectures to exploit the parallelism resulting from these independencies.

Three-Dimensional Modelling for Cultural Heritage

2021 ◽  
pp. 418-443
Author(s):  
Luis Marques ◽  
Josep Roca
Keyword(s):  
Augmented Reality ◽  
3D Modeling ◽  
Three Dimensional ◽  
Human Perception ◽  
3D Models ◽  
3D Modelling ◽  
Digital Archives ◽  
Spatial Environment ◽  
The City ◽  
Model Visualization

The creation of 3D models of urban elements is extremely relevant for urbanists constituting digital archives and being especially useful for enriching maps and databases or reconstructing and analyzing objects/areas through time, building/recreating scenarios and implementing intuitive methods of interaction. The widespread data available online offer new opportunities to generate realistic 3D models without the need to go physically to the place. This chapter aims to demonstrate the potential 3D modeling and visualization/interaction of urban elements in the city for multiple purposes, and it is organized in four main topics: The first deals with the theoretical framework regarding the bases of the human perception of the spatial environment and the importance of 3D modelling. The second and third deal with technical procedures on terrestrial/aerial data acquisition and demonstrate alternatively data gathered online to generate 3D models for the visualization of urban elements of the city, and the fourth introduces 3D model visualization within an augmented reality environment.

Three-dimensional SWCNT and MWCNT hybrid networks for extremely high-loading and high rate cathode materials

2019 ◽  
Vol 7 (29) ◽  
pp. 17412-17419 ◽  
Author(s):  
Dae-wook Kim ◽  
Nobuyuki Zettsu ◽  
Katsuya Teshima
Keyword(s):  
Cathode Materials ◽  
Three Dimensional ◽  
Hybrid Networks ◽  
High Rate ◽  
Self Organization ◽  
High Loading ◽  
Dimensional Network

Extremely high-loading LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode materials (up to 99.5 wt%) were achieved through self-organization of a three-dimensional network of multi-walled and single-walled CNT hybrids.

Ordered Assembling of Size and Shape Selected Nanocrystals

1998 ◽  
Vol 4 (S2) ◽  
pp. 728-729
Author(s):  
Z.L. Wang
Keyword(s):  
Organic Molecules ◽  
Three Dimensional ◽  
Building Blocks ◽  
Organic Coating ◽  
Self Organization ◽  
Functional Specificity ◽  
Orientation Order ◽  
Self Assembled ◽  
Superlattice Structures ◽  
Physical And Chemical

Nanoparticles and the physical and chemical functional specificity and selectivity they possess, suggest them as ideal building blocks for two- and three-dimensional cluster self-assembled superlattice structures, in which the particles behave as well-defined molecular matter and they are arranged with long-range translation and even orientation order [1]. Self-assembled arrays involve self-organization into monolayers, thin films, and superlattices of size-selected nanoclusters encapsulated in protective compact organic coating. The macroscopic properties of the nanocrystal superlattice (NCS) are determined not only by the properties of each individual particle but by the coupling/interaction between nanocrystals interconnected and isolated by a monolayer of thin organic molecules.Periodic packing of nanocrystals is different from the 3-D packing of atoms. First, to an excellent approximation atoms are spherical, while nanoparticles can be faceted polyhedra, thus, the 3-D packing of particles can be critically affected by their shapes and sizes.

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