Advanced Transport Operation Effects on Pilot Scan Patterns

1979 ◽  
Vol 23 (1) ◽  
pp. 347-351 ◽  
Author(s):  
Randall L. Harris ◽  
Randolph W. Mixon
Keyword(s):  
Stress Level ◽  
Automatic System ◽  
Pupil Diameter ◽  
System Control ◽  
Control Loop ◽  
Fixed Base ◽  
Vehicle Simulator ◽  
Manual Mode ◽  
Made In

Long straight-in and close-in, curved, descending instrument approaches were made in NASA's fixed-base Terminal Configured Vehicle simulator. The pilot either manually controlled the simulator or monitored the automatic system control of the simulated aircraft during the approach. Tests were performed with or without the display of traffic. The results indicate that the pilots' use of the Electronic Horizontal Situation Indicator (EHSI) increased appreciably for the close-in, curved, descending approach compared to the conventional straight-in approach. When operating as a monitor of the autopilot system, the pilot scanned around more with less attention devoted to the Electronic Attitude Direction Indicator (EADI). The pilots preferred the manual mode because it kept them in the control loop. The addition of displayed traffic to the EHSI increased the pilots' use of the EHSI with a corresponding reduction in his use of the EADI. Also, the pilot's pupil diameter increased during the landing flare indicating a higher stress level even though the tests were conducted in a fixed-base simulator.

Model of a neural network adaptive system for a digital control loop of an electric drive

2021 ◽  
Author(s):  
O.V. Nepomnyashchiy ◽  
A.V. Tarasov ◽  
Yu.V. Krasnobaev ◽  
V.N. Khaidukova ◽  
D.O. Nepomnyashchiy
Keyword(s):  
Neural Network ◽  
Intelligent Control ◽  
Electric Drive ◽  
Electric Motor ◽  
Control Device ◽  
System Control ◽  
Electric Transport ◽  
Control Loop ◽  
Software Environment ◽  
Power System Control

The problem of increasing the efficiency of power units of autonomous electric transport vehicles is considered. The task of creating a promising power system control device has been singled out. It is determined that in creating such devices, significant results can be obtained by using an intelligent module in the control loop of the electric drive. Goal. It is necessary to develop a power plant model with intelligent control, allowing to obtain data sets about currents, voltages and engine speeds in different modes of operation. The architecture of an intelligent control device, a PID controller based on a neural network, has been proposed; it has been proposed to exclude rotor angular velocity sensors from the classical feedback loop. The type and architecture of the neural network is defined. In the software environment MatLab the model of neuroemulator of the engine for formation of a training sample of a neural network by a method of Levenberg – Marquardt is developed. The trained neural network is implemented in the developed model of the electric motor control loop. The results of simulation of the intelligent control device showed a good convergence of the output influences generated by the neuroemulator with the actual parameters of the electric motor.

scholarly journals Task-evoked pupil responses reflect internal belief states

2018 ◽  
Author(s):  
O. Colizoli ◽  
J.W. de Gee ◽  
A.E. Urai ◽  
T.H. Donner
Keyword(s):  
Pupil Diameter ◽  
Theoretical Work ◽  
Prediction Errors ◽  
Decision Confidence ◽  
Uncertain Evidence ◽  
Recent Theoretical Work ◽  
The Face ◽  
Belief States ◽  
State Of The Environment ◽  
Made In

AbstractPerceptual decisions about the state of the environment are often made in the face of uncertain evidence. Internal uncertainty signals are considered important regulators of learning and decision-making. A growing body of work has implicated the brain’s arousal systems in uncertainty signaling. Here, we found that two specific computational variables, postulated by recent theoretical work, evoke boosts of arousal at different times during a perceptual decision: decision confidence (the observer’s internally estimated probability that a choice was correct given the evidence) before feedback, and prediction errors (deviations from expected reward) after feedback. We monitored pupil diameter, a peripheral marker of central arousal state, while subjects performed a challenging perceptual choice task with a delayed monetary reward. We quantified evoked pupil responses during decision formation and after reward-linked feedback. During both intervals, decision difficulty and accuracy had interacting effects on pupil responses. Pupil responses negatively scaled with decision confidence prior to feedback and scaled with uncertainty-dependent prediction errors after feedback. This pattern of pupil responses during both intervals was in line with a model using the observer’s graded belief about choice accuracy to anticipate rewards and compute prediction errors. We conclude that pupil-linked arousal systems are modulated by internal belief states.

Influence of number of cycles on strain

1978 ◽  
Vol 15 (4) ◽  
pp. 584-592 ◽  
Author(s):  
Vijay K. Khosla ◽  
Ram D. Singh
Keyword(s):  
Stress Level ◽  
Permanent Deformation ◽  
Field Performance ◽  
Complete Spectrum ◽  
Ottawa Sand ◽  
The Past ◽  
Stress Cycles ◽  
Number Of Cycles ◽  
Made In

In the past, tests conducted on sand to evaluate the field performance of machine foundations have utilized only a limited number of load cycles. Results of these tests were extrapolated to determine the permanent deformation experienced by the foundation materials over the life of the machines. An attempt has been made in this presentation to develop a complete spectrum of the variation of strain with stress level and number of loading cycles for anisotropically consolidated Ottawa sand. Up to 10 million stress cycles were applied. The axial strains show three distinct stages of strain with number of cycles.

ATSTATOMOJO REABILITACINIO GYDYMO ĮTAKA PACIENTŲ GYVENIMO KOKYBEI PO STOMOS SUFORMAVIMO OPERACIJOS

2013 ◽  
Vol 23 (2) ◽  
pp. 116-121
Author(s):  
Jurgita Gulbinienė ◽  
Ugnė Žalkauskaitė
Keyword(s):  
Quality Of Life ◽  
Stress Level ◽  
Physical Condition ◽  
Skin Care ◽  
Psychological State ◽  
Rehabilitation Treatment ◽  
Self Evaluation ◽  
Two Stages ◽  
Made In

The aim of study was to evaluate the change quality of life of ostomy patients after reconstructive rehabilitation treatment. The study was performed in two Lithuanian‘s sanatoriums. The study was made in two stages. We questioner 40 patients, who arrived to sanatoriums for rehabilitation after ostomy operation. Patient‘s were asked to answer the questionnaires in the first day of stay and 3 month after operation. Questionnaires: Ostomate Quality of Life (QOL) Survey and 15 supplementary question were used. The results of the study show that after three months following ostomy operation patient‘s quality of life improves significantly. The results of the study show that stress level was significantly lower (77,5 percent) in three months after having an intestine stoma operation, physical condition got better (80 percent), psychological state (75 percent), self-evaluation (72,5 percent), sexuality (52,5 percent), activeness has risen as well (85 percent) (p<0,05). Patients education began in a hospital and is continued at the sanatorium. Ostomy patients were introduced about changing the colostomy pouches and parastomal skin care. It is important to note that at the sanatorium the majority of ostomy patients receive information about nutrition peculiarities. Conclusions. The quality of life of ostomy patients improved significantly in many areas after reconstructive rehabilitation treatment.

PMSG Based WECS with PR Control Strategy for Grid Control

2014 ◽  
Vol 573 ◽  
pp. 267-272
Author(s):  
V. Prasath ◽  
S. Vijayalakshmi ◽  
R. Jain Anush
Keyword(s):  
Control Strategy ◽  
Harmonic Distortion ◽  
High Gain ◽  
System Control ◽  
Control Loop ◽  
Current Feedback ◽  
Lcl Filter ◽  
Order Function ◽  
Average Value ◽  
Pr Controller

In this paper, a current feedback control scheme is proposed using Proportional Resonant (PR) for a grid-connected converter with an LCL Filter; PR controller with harmonic compensators has high gain at the desired frequencies for decrease harmonic distortion in the alternative voltage or current. Harmonic compensators of PR controller are limited to several low-order harmonics due to the system instability when the compensated frequency is out of system control loop’s bandwidth. The average value of current flow through inductors of LCL filter is feedback to the PR current regulator. Zero D-axis Control (ZDC) is to control the generator side converter to reduce the DC-link ripples, multi-loop harmonic current controllers are applied to regulate the higher-order harmonics by PR regulators. Consequently control strategy with LCL filter is to reduce third-order function to first-order function. By this way large control loop gain can be chosen to obtain control loop for the required harmonic components of the PR controller. The simulation and experimental results have been illustrated to validate the effectiveness of the proposed method in MATLAB Simulink.

A study of bearing capacity of skirted octagonal footings resting on different sands

2021 ◽  
Vol 1 (107) ◽  
pp. 21-31
Author(s):  
A. Thakur ◽  
R.K. Dutta
Keyword(s):  
Numerical Analysis ◽  
Bearing Capacity ◽  
Stress Level ◽  
Design Methodology ◽  
Numerical Models ◽  
Ultimate Bearing Capacity ◽  
Field Size ◽  
3D Software ◽  
Plaxis 3D ◽  
Made In

Purpose: After a thorough study of literature it is concluded that the studies related to unskirted/skirted octagonal footings on sand have not yet been investigated. Thus, this paper presents a numerical analysis to assess the ultimate bearing capacity of the unskirted, unskirted-embedded, singly and doubly skirted octagonal footings resting on different sands (S1, S2, and S3). The length of skirt and depth of the embedded footing were varied from 0.0B to 1.5B. Design/methodology/approach: The numerical square and octagonal footing with singly and doubly skirted footing models were developed using Plaxis 3D software. Findings: The results of the doubly skirted octagonal footings ultimate bearing capacity were marginally higher in comparison to the singly skirted footing at all normalised skirt depths as well as for all sands up to a Ds/B ratio 0.25 beyond which the increase in the ultimate bearing capacity in case of doubly skirted footing was appreciable. Research limitations/implications: The results presented in this paper were based on numerical analysis. However, for the actual footings the soil placement and compaction, details of skirt construction and the stress level will be different from the numerical analysis. Further investigations using full-scale numerical models simulating field size footings were recommended to generalize the results. Originality/value: No such study on singly and doubly skirted octagonal shaped footings were conducted so far. Hence, an attempt was made in this article to predict the bearing capacity of those footings using Plaxis 3D.

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