A Null Constrained Weight Based on Focused Beam Forming

2014 ◽  
Vol 875-877 ◽  
pp. 2137-2142
Author(s):  
Wei Zhou ◽  
Feng Xu
Keyword(s):  
Real Time ◽  
Measurement Technique ◽  
Beam Forming ◽  
Image Measurement ◽  
Acoustic Image ◽  
First Derivative ◽  
Real Time Simulations ◽  
The Given ◽  
Focused Beam

The performance of acoustic image measurement technique will be affected badly by coherence interference, even unable to get the noise targets image at all. A null weight constrained by zero and first derivative based on focused beam forming is proposed in this paper. The weight can put null on the given positions which are only decided by the interferences positions. The weight also has advantages in high robustness and low computation account which doesnt have to be calculated on real time. Simulations about single and multiple interferences on the condition of different SIR are proposed in the paper. And the results show that the new weight proposed in this paper can get targets image while putting nulls on the coherent interferences position.

scholarly journals ATCO radar training assessment and flight efficiency: the correlation between trainees’ scores and fuel consumption in real-time simulations

2020 ◽  
pp. 1-17
Author(s):  
T. Rogošić ◽  
B. Juričić ◽  
F. Aybek Çetek ◽  
Z. Kaplan
Keyword(s):  
Real Time ◽  
Fuel Consumption ◽  
Basic Training ◽  
Air Traffic Controller ◽  
Training Assessment ◽  
Assessment Scores ◽  
Human In The Loop ◽  
Assessment Standards ◽  
Two Parameters ◽  
Real Time Simulations

ABSTRACT Air traffic controller training is highly regulated but lacks prescribed common assessment criteria and methods to evaluate trainees at the level of basic training and consideration of how trainees in fluence flight efficiency. We investigated whether there is a correlation between two parameters, viz. the trainees’ assessment score and fuel consumption, obtained and calculated after real-time human-in-the-loop radar simulations within the ATCOSIMA project. Although basic training assessment standards emphasise safety indicators, it was expected that trainees with higher assessment scores would achieve better flight efficiency, i.e. less fuel consumption. However, the results showed that trainees’ assessment scores and fuel consumption did not correlate in the expected way, leading to several conclusions.

Condition Monitoring of Tank Bore Surface Characteristics by an Integrated Measurement Technique

2021 ◽  
Vol 13 (2) ◽  
Author(s):  
Ramesh Shanmugam ◽  
D. Dinakaran ◽  
D.G. Harris Samuel
Keyword(s):  
Real Time ◽  
Condition Monitoring ◽  
Measurement Technique ◽  
Great Degree ◽  
Surface Characteristics ◽  
Integrated Approach ◽  
Thermal Camera ◽  
Monitoring Method ◽  
Measuring Surface ◽  
Combat Effectiveness

Accuracy and safety of tank guns are dependent a great degree on the condition of its gun bore. Many parameters affect accuracy and safety and have strong and complex interdependencies. While it is extremely difficult to monitor all these parameters during battle conditions, it is also essential to enhance the accuracy of the gun by measuring and compensating these parameters. Among all, bore wear and bore centreline are predominant factors. The surface characteristics of the bore also are indicative of potential accidents/deterioration, which should be monitored continuously. Hence, condition monitoring of tank gun bore characteristics in near real-time is an impending need with huge potential for enhancing the combat effectiveness of tank formations. This paper analyses various bore parameters affecting accuracy and safety and proposes a comprehensive condition monitoring method that uses vision camera, thermal camera and mechanical profiler. This integrated approach provides enhanced accuracy in measuring surface characteristics of tank bore that has been partially validated.

Improving Occupational Safety of the Metallurgical Enterprises Workers by the Methods of Monitoring the Psychophysiological Parameters of an Employee in Real Time

2021 ◽  
pp. 53-58
Author(s):  
D.A. Vishnevskiy ◽  
◽  
A.P. Zhiltsov ◽  
A.V. Bocharov ◽  
A.L. Sotnikov ◽  
...  
Keyword(s):  
Real Time ◽  
Personnel Selection ◽  
Occupational Safety ◽  
Metallurgical Industry ◽  
Sharp Change ◽  
Working Process ◽  
Skin Response ◽  
Psychophysiological State ◽  
Production Area ◽  
The Given

Presented are the developments using methods of monitoring the psychophysiological state of a person that are designed to improve the work safety of the employees at the metallurgical enterprises. A wearable device was developed for taking readings of the psychophysiological reactions (pulse, galvanic skin response, body and environmental temperature, etc.), and for determining the location of an employee within the production area in real time. The device can also record a sharp change in the position of a person in space, which indirectly indicates an emergency. The device indicates and reads changes throughout the shift and transfers to the server; when one of the monitored parameters increases, a message is generated on the operator monitor about a problem in the employee condition and his location. Previously developed program «System for monitoring the psychophysiological state of an operator at the metallurgical industry» with the help of a software processes the information from the device and warns the operator about the occurred hazard, and, also, suggests the ways for solving the problem. However, the decision itself remains with the operator. Under the conditions of working process modeling using the given parameters, the situations (accidents, personnel selection) were simulated that were close to real ones, which allowed to conduct a comparative analysis of the maximum and minimum permissible characteristics of the psychophysiological reactions for the employees of the metallurgical production. The developed device and monitoring system can significantly reduce (or completely prevent) the number of errors and accidents at the production site that are provoked by the influence of the human factor.

scholarly journals Lateral Trochlear Inclination Angle: Measurement via a 2-Image Technique to Reliably Characterize and Quantify Trochlear Dysplasia

2020 ◽  
Vol 8 (10) ◽  
pp. 232596712095841
Author(s):  
Sheeba M. Joseph ◽  
Chris Cheng ◽  
Matthew J. Solomito ◽  
J. Lee Pace
Keyword(s):  
Measurement Technique ◽  
Trochlear Dysplasia ◽  
Intraclass Correlation ◽  
Single Image ◽  
Image Measurement ◽  
Mri Scan ◽  
Morphologic Characteristics ◽  
Mri Scans ◽  
Image Technique ◽  
Dejour Classification

Background: Trochlear dysplasia (TD) is a risk factor for patellar instability (PI). The Dejour classification categorizes TD but has suboptimal reliability. Lateral trochlear inclination (LTI) is a quantitative measurement of trochlear dysplasia on a single axial magnetic resonance imaging (MRI) scan. Hypothesis: A modified LTI measurement technique using 2 different axial MRI scans that reference the most proximal aspect of the trochlear cartilage on 1 image and the fully formed posterior condyles on the second image would be as reliable as and significantly different from the single-image measurement technique for LTI. Further, the 2-image LTI would adequately represent overall proximal trochlear morphologic characteristics. Study Design: Cohort study (diagnosis); Level of evidence, 2. Methods: Patients aged 9 to 18 years treated for PI between 2014 and 2017 were identified. The Dejour classification was radiographically determined. Single-image LTI was measured on a single axial MRI scan at the most proximal aspect of visible trochlear cartilage. A 2-image LTI was measured from 2 separate MRI scans: 1 at the most proximal aspect of trochlear cartilage and the second at the fully formed posterior condyles. This 2-image LTI was repeated at 3 subsequent levels (the first measurement is referred to as LTI-1; repeated measurements are LTI-2, LTI-3, and LTI-4, moving distally). In total, 65 patients met the inclusion criteria, and 30 were randomly selected for reliability analysis. Results: Inter- and intrarater reliability trended toward more variability for single-image LTI (intraclass correlation coefficient [ICC], 0.86 and 0.88, respectively) than for 2-image LTI (ICC, 0.97 and 0.96, respectively). The Dejour classification had lower intra- and interrater reliability (ICC, 0.31 and 0.73, respectively). Average single-image LTI (9.2° ± 12.6°) was greater than average 2-image LTI-1 (4.2° SD ± 11.9°) ( P = .0125). Single-image LTI classified 60% of patients with PI as having TD, whereas the 2-image LTI classified 71% as having TD. The 2-image LTI was able to capture 91% of overall proximal trochlear morphologic characteristics. Conclusion: LTI has higher reliability when performed using a 2-image measurement technique compared with single-image LTI and Dejour classification. The strong correlation between 2-image LTI and average LTI shows that 91% of TD is represented on the most proximal axial image. Because the single-image measurement appears to underestimate dysplasia, previously described thresholds should be reexamined using this 2-image technique to appropriately characterize TD.

Real Time Acoustic Imaging by Holographic Interferometry

1980 ◽  
Vol 2 (4) ◽  
pp. 313-323 ◽  
Author(s):  
Amin Hanafy ◽  
Mauro Zambuto
Keyword(s):  
Real Time ◽  
Holographic Interferometry ◽  
Vibration Amplitude ◽  
Imaging System ◽  
Mechanical Vibration ◽  
Visual Image ◽  
Acoustic Imaging ◽  
Acoustic Image ◽  
Vibration Pattern ◽  
Amplitude Amplification

A two-step real time acoustic imaging system is presented. The system incorporates a novel acoustic image coupler which transfers an acoustical interference pattern from a water-bounded to an air-bounded surface with vibration amplitude amplification. An original technique termed step-biased real time holographic interferometry is used to convert the amplified mechanical vibration pattern, which carries all information about the insonified object, into a visual image with improved sensitivity.

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