scholarly journals Spatial Information and Performance Evaluation in Coprime Array

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Ying Zhou ◽  
Dazhuan Xu ◽  
Chao Shi ◽  
Weilin Tu ◽  
Junpeng Shi
Keyword(s):  
Mutual Information ◽  
Information Content ◽  
Spatial Information ◽  
Theoretical Expression ◽  
Array Configuration ◽  
Actual Environment ◽  
Uniform Array ◽  
Entropy Error ◽  
And Performance ◽  
Coprime Array

In this paper, the mutual information between the received signals and the source in the coprime linear array is investigated. In Shannon’s information theory, the mutual information is used to quantify the reduction in the priori uncertainty of the transmitted message. Similarly, the spatial information in the coprime array is the mutual information between direction of arrival (DOA), source amplitude, and received signals. Such information content is composed of two parts. The first part is DOA information, and the second one is scattering information. In a single source scenario, we derive the theoretical expression and its asymptotic upper bound of DOA information. The corresponding expression of scattering information is also formulated theoretically. Besides, the application of spatial information is discussed. We can obtain the optimal array configuration by maximizing the DOA information of the coprime array. Similarly, the information is also used to quantify the performance difference between the coprime array and uniform array. In addition, the entropy error is employed to evaluate the estimation performance based on spatial information. Numerical simulation of the information content confirms our theoretical analysis. The results in this paper have important guiding significance for the design of the coprime array in the actual environment.

Sparse DOA estimation based on a shifted coprime array configuration

2016 ◽  
Author(s):  
Saeed M. Alamoudi ◽  
Mohammed A. Aldhaheri ◽  
Saleh A. Alawsh ◽  
Ali H. Muqaibel
Keyword(s):  
Doa Estimation ◽  
Array Configuration ◽  
Coprime Array

scholarly journals The Fear to Move in a Crowded Environment. Poor Spatial Memory Related to Agoraphobic Disorder

2021 ◽  
Vol 11 (6) ◽  
pp. 796
Author(s):  
Micaela Maria Zucchelli ◽  
Laura Piccardi ◽  
Raffaella Nori
Keyword(s):  
Working Memory ◽  
Spatial Information ◽  
Theoretical Background ◽  
Exploratory Activity ◽  
Visuospatial Working Memory ◽  
Spatial Tasks ◽  
And Performance ◽  
The Relationship ◽  
Crowded Environment ◽  
Active Processing

Individuals with agoraphobia exhibit impaired exploratory activity when navigating unfamiliar environments. However, no studies have investigated the contribution of visuospatial working memory (VSWM) in these individuals’ ability to acquire and process spatial information while considering the use of egocentric and allocentric coordinates or environments with or without people. A total of 106 individuals (53 with agoraphobia and 53 controls) navigated in a virtual square to acquire spatial information that included the recognition of landmarks and the relationship between landmarks and themselves (egocentric coordinates) and independent of themselves (allocentric coordinates). Half of the participants in both groups navigated in a square without people, and half navigated in a crowded square. They completed a VSWM test in addition to tasks measuring landmark recognition and egocentric and allocentric judgements concerning the explored square. The results showed that individuals with agoraphobia had reduced working memory only when active processing of spatial elements was required, suggesting that they exhibit spatial difficulties particularly in complex spatial tasks requiring them to process information simultaneously. Specifically, VSWM deficits mediated the relationship between agoraphobia and performance in the allocentric judgements. The results are discussed considering the theoretical background of agoraphobia in order to provide useful elements for the early diagnosis of this disorder.

scholarly journals The Scope of Earth-Observation to Improve the Consistency of the SDG Slum Indicator

2018 ◽  
Vol 7 (11) ◽  
pp. 428 ◽  
Author(s):  
Monika Kuffer ◽  
Jiong Wang ◽  
Michael Nagenborg ◽  
Karin Pfeffer ◽  
Divyani Kohli ◽  
...  
Keyword(s):  
Latin American ◽  
Spatial Information ◽  
Earth Observation ◽  
Living Conditions ◽  
Ethical Considerations ◽  
Continuous Increase ◽  
Data Provision ◽  
And Performance ◽  
American Cities ◽  
The City

The continuous increase in deprived living conditions in many cities of the Global South contradicts efforts to make cities inclusive, safe, resilient, and sustainable places. Using examples of Asian, African, and Latin American cities, this study shows the scope and limits of earth observation (EO)-based mapping of deprived living conditions in support of providing consistent global information for the SDG indicator 11.1.1 “proportion of urban population living in slums, informal settlements or inadequate housing”. At the technical level, we compare several EO-based methods and imagery for mapping deprived living conditions, discussing their ability to map such areas including differences in terms of accuracy and performance at the city scale. At the operational level, we compare available municipal maps showing identified deprived areas with the spatial extent of morphological mapped areas of deprived living conditions (using EO) at the city scale, discussing the reasons for inconsistencies between municipal and EO-based maps. We provide an outlook on how EO-based mapping of deprived living conditions could contribute to a global spatial information base to support targeting of deprived living conditions in support of the SDG Goal 11.1.1 indicator, when uncertainties and ethical considerations on data provision are well addressed.

scholarly journals Honeybee dance-followers respond similarly to dances regardless of their spatial information content

2021 ◽  
Author(s):  
Matthew J. Hasenjager ◽  
William Hoppitt ◽  
Ellouise Leadbeater
Keyword(s):  
Information Content ◽  
Spatial Information ◽  
Empirical Support ◽  
Long Distance ◽  
Individual Level ◽  
Self Organized ◽  
Diffusion Analysis ◽  
Novel Targets ◽  
The Individual ◽  
Collective Influence

AbstractHoneybees famously use waggle dances to communicate foraging locations to nestmates in the hive, thereby recruiting them to those sites. The decision to dance is governed by rules that, when operating collectively, are assumed to direct foragers to the most profitable locations with little input from potential recruits, who are presumed to respond similarly to any dance regardless of its information content. Yet variation in receiver responses can qualitatively alter collective outcomes. Here, we use network-based diffusion analysis to compare the collective influence of dance information during recruitment to feeders at different distances. We further assess how any such effects might be achieved at the individual level by dance-followers either persisting with known sites when novel targets are distant and/or seeking more accurate spatial information to guide long-distance searches. Contrary to predictions, we found no evidence that dance-followers’ responses depended on target distance. While dance information was always key to feeder discovery, its importance did not vary with feeder distance, and bees were in fact quicker to abandon previously rewarding sites for distant alternatives. These findings provide empirical support for the longstanding assumption that self-organized foraging by honeybee colonies relies heavily on signal performance rules with limited input from recipients.

Human Stereopsis, Fusion, and Stereoscopic Virtual Environments

1995 ◽  
Author(s):  
Elizabeth Thorpe Davis ◽  
Larry F. Hodges
Keyword(s):  
Virtual Environments ◽  
Visual Cues ◽  
Spatial Information ◽  
Spatial Perception ◽  
Human Perception ◽  
Stereoscopic Vision ◽  
Human Vision ◽  
Spatial Factors ◽  
Stereoscopic Displays ◽  
And Performance

Two fundamental purposes of human spatial perception, in either a real or virtual 3D environment, are to determine where objects are located in the environment and to distinguish one object from another. Although various sensory inputs, such as haptic and auditory inputs, can provide this spatial information, vision usually provides the most accurate, salient, and useful information (Welch and Warren, 1986). Moreover, of the visual cues available to humans, stereopsis provides an enhanced perception of depth and of three-dimensionality for a visual scene (Yeh and Silverstein, 1992). (Stereopsis or stereoscopic vision results from the fusion of the two slightly different views of the external world that our laterally displaced eyes receive (Schor, 1987; Tyler, 1983).) In fact, users often prefer using 3D stereoscopic displays (Spain and Holzhausen, 1991) and find that such displays provide more fun and excitement than do simpler monoscopic displays (Wichanski, 1991). Thus, in creating 3D virtual environments or 3D simulated displays, much attention recently has been devoted to visual 3D stereoscopic displays. Yet, given the costs and technical requirements of such displays, we should consider several issues. First, we should consider in what conditions and situations these stereoscopic displays enhance perception and performance. Second, we should consider how binocular geometry and various spatial factors can affect human stereoscopic vision and, thus, constrain the design and use of stereoscopic displays. Finally, we should consider the modeling geometry of the software, the display geometry of the hardware, and some technological limitations that constrain the design and use of stereoscopic displays by humans. In the following section we consider when 3D stereoscopic displays are useful and why they are useful in some conditions but not others. In the section after that we review some basic concepts about human stereopsis and fusion that are of interest to those who design or use 3D stereoscopic displays. Also in that section we point out some spatial factors that limit stereopsis and fusion in human vision as well as some potential problems that should be considered in designing and using 3D stereoscopic displays. Following that we discuss some software and hardware issues, such as modelling geometry and display geometry as well as geometric distortions and other artifacts that can affect human perception.

scholarly journals Extended Coprime Array Configuration Generating Large-Scale Antenna Co-Array in Massive MIMO System

2019 ◽  
Vol 68 (8) ◽  
pp. 7841-7853 ◽  
Author(s):  
Wang Zheng ◽  
Xiaofei Zhang ◽  
Yunfei Wang ◽  
Mengjie Zhou ◽  
Qihui Wu
Keyword(s):  
Massive Mimo ◽  
Large Scale ◽  
Mimo System ◽  
Array Configuration ◽  
Coprime Array

scholarly journals Mild Traumatic Brain Injury Decreases Spatial Information Content and Reduces Place Field Stability of Hippocampal CA1 Neurons

2020 ◽  
Vol 37 (2) ◽  
pp. 227-235 ◽  
Author(s):  
John I. Broussard ◽  
John B. Redell ◽  
Jing Zhao ◽  
Mark E. Maynard ◽  
Nobuhide Kobori ◽  
...  
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Information Content ◽  
Mild Traumatic Brain Injury ◽  
Spatial Information ◽  
Place Field ◽  
Ca1 Neurons ◽  
Hippocampal Ca1 Neurons ◽  
Hippocampal Ca1

scholarly journals Human Cognitive and Motor Abilities in the Aging Workforce: An Information-Based Model

2020 ◽  
Vol 10 (17) ◽  
pp. 5958
Author(s):  
Salvatore Digiesi ◽  
Daniela Cavallo ◽  
Andrea Lucchese ◽  
Carlotta Mummolo
Keyword(s):  
Information Content ◽  
Cognitive Abilities ◽  
Cognitive Task ◽  
Experimental Studies ◽  
Motor Task ◽  
Aging Workforce ◽  
Motor Abilities ◽  
Workforce Aging ◽  
And Performance

In the digital society, individuals are in charge of performing tasks based on the information gathered by huge amount of data and effectively use them to manifest their cognitive and motor abilities. In this paper, on the basis of experimental studies available in literature concerning lab tests on motor or cognitive abilities of differently aged subjects, an information-based theoretical model is proposed. The model allows to quantify the information content of a motor or a cognitive task and provides estimates of information processing time of individuals of different age and sex in accomplishing tasks with prevalent motor or cognitive nature, in spite of the fact that a “pure” cognitive or a “pure” motor task are rarely observed in practical cases. The model is then applied to a case study from automotive industry in which workforce aging phenomenon is experienced. Potential applications of the model go beyond the case study developed. Quantifying the information content of a general motor-cognitive task paves the way to new understanding and modelling of movements and performance time of both natural and artificial systems with applications in industrial robotics (e.g., human-robot cooperation), biomechanics, and neurorehabilitation.

Sizing Software of a Solar Farm System

2015 ◽  
Vol 785 ◽  
pp. 611-615
Author(s):  
Nuril Yaqin Ab Rahim ◽  
Shahril Irwan Sulaiman ◽  
Zulkifli Othman
Keyword(s):  
Performance Ratio ◽  
Specific Yield ◽  
Array Configuration ◽  
Pv Module ◽  
Planning Procedure ◽  
In Series ◽  
Final Yield ◽  
Tariff Rates ◽  
And Performance ◽  
Farm System

This paper presents sizing software for the design of a solar farm system. The sizing software provides few guidelines to the designer for the planning procedure before the final of optimum array configuration is decided. Some specifications that the designer may consider are the type of PV module, the type of inverter, the available space for installation, the required energy per year and also the sum of money to be allocated for the instalment. The output result of this software will be the suggestion of possible configuration of the total number of modules in series per string with the total number of strings in parallel. This software also does the prediction of the system performances such as final yield, specific yield and performance ratio. The expected income is provided by the software is based on the Feed-in Tariff rates and the energy generated by the system.

Sign in / Sign up

Export Citation Format

Share Document