scholarly journals A New Vibration Measurement Procedure for On-Line Quality Control of Electronic Devices

2002 ◽  
Vol 9 (1-2) ◽  
pp. 3-10
Author(s):  
Gian Marco Revel
Keyword(s):  
Quality Control ◽  
Power Supply ◽  
Electronic Devices ◽  
High Sensitivity ◽  
Experimental Tests ◽  
Measurement Procedure ◽  
International Standards ◽  
Vibration Measurement ◽  
Testing Time ◽  
On Line

In this paper the problem of experimentally testing the mechanical reliability of electronic components for quality control is approached. In general, many tests are performed on electronic devices (personal computers, power supply units, lamps, etc.), according to the relevant international standards (IEC), in order to verify their resistance to shock and vibrations, but these are mainly “go no-go” experiments, performed on few samples taken from the production batches.The idea here proposed is to improve the efficiency of these tests by using electro-optic techniques for the measurement of the vibration behaviour of the components under known excitation. This would allow the on-line testing of a high percentage of the production and would be useful to give important feedback to the design process.Scanning laser Doppler vibrometry seems to be a valuable solution for this problem, thanks to its capabilities of measuring several spatially-defined points on a vibrating object with reduced testing time for on-line application, with high sensitivity and accuracy, non-intrusivity and with any kind of excitation signal. Experimental tests are performed on a power supply: the results show the effectiveness of the proposed approach. The metrological problems connected with the on-line implementation are also discussed.

scholarly journals Challenges in meeting patient assessment international standards in ambulatory tuberculosis services

2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
L A Aslanyan ◽  
N T Truzyan
Keyword(s):  
Quality Control ◽  
Radiation Safety ◽  
Safety Management ◽  
Management Program ◽  
International Standards ◽  
Capital City ◽  
Diagnostic Tools ◽  
Patient Assessment ◽  
Safety Program ◽  
Environmental Controls

Abstract Background Limitations of tuberculosis (TB) diagnostic tools and measures restrict proper TB control in places with high drug-resistant TB prevalence. This study aimed to explore gaps in the primary health care (PHC) TB services in Armenia compared to international standards on Assessment of Patients (AOP). Methods We applied mixed methods to assess the AOP standards in 30 outpatient TB centers using observational and documents/medical records review's standardized checklists, in-depth interviews, and focus group discussions. Evaluation was conducted in all 10 regions of Armenia and the capital city Yerevan. Joint Commission International Standards for Ambulatory Care, International Standards for TB Care, and WHO framework, served as a guideline for this assessment. Results PHC physicians are qualified for a set of examinations to diagnose TB. Planned reassessments are conducted continuously, though defined writings for the scope and content of reassessments administered by each clinical discipline is absent. Laboratory departments provide high quality services to the TB patients with the defined timeframes for reporting the results. Laboratory and radiology services staff is qualified and experienced. The biosafety rules are compliant with local and international standards. However, the location and conditions of the laboratory departments are mostly non-compliant with the standards. Lack of modern equipment restricts maintaining proper environmental controls, including ventilation systems. Laboratory technicians have little knowledge of the organization's safety management program and its relation to the laboratory safety program. The facilities have neither formal quality control programs regulated by documents and policies nor an identified radiation safety program protocol. Conclusions On the level of AOP standards, the PHC TB services in Armenia have satisfactory performance. However, assessed standards for this function required certain improvements. Key messages In Armenia, the tuberculosis care in PHC facilities presents high level of compliance for patient assessment international standards. To fully meet the standards, facilities need to reconstructed/renovated laboratories and establish the radiology and diagnostic equipment management, quality control and radiation safety programs.

On-Line Quality Control

1995 ◽  
pp. 37-57 ◽  
Author(s):  
Frank W. Henrikson
Keyword(s):  
Quality Control ◽  
On Line

On-Site Experimental Testing to Study the Vibration of Composite Floors

2014 ◽  
Vol 601 ◽  
pp. 231-234
Author(s):  
Cristian Lucian Ghindea ◽  
Dan Cretu ◽  
Monica Popescu ◽  
Radu Cruciat ◽  
Elena Tulei
Keyword(s):  
Dynamic Characteristics ◽  
Experimental Testing ◽  
Concrete Slab ◽  
Human Perception ◽  
Experimental Tests ◽  
International Standards ◽  
Structural Element ◽  
Element Analysis ◽  
Floor Slabs ◽  
Composite Floors

As a general trend, in order to reduce material consumption or to reduce the mass of the structures, composite floor slabs solutions are used to achieve large spans floor slabs. This solutions led to floors sensitive to vibrations induced generally by human activities. As a verification of the design concepts of the composite floors, usually, it is recommended a further examination of the floor after completion by experimental tests. Although the experimental values of the dynamic response of the floor are uniquely determined, the processing can take two directions of evaluation. The first direction consist in determining the dynamic characteristics of the floor and their comparison with the design values. Another way that can be followed in the processing of the experimental results is to consider the human perception and comfort to the vibration on floors. The paper aims to present a case study on a composite floor, with steel beams and concrete slab, tested on-site. Both aspects of data processing are analyzed, in terms of the structural element, and in terms of the effect on human perception and comfort. Experimentally obtained values for the dynamic characteristics of the floor are compared with numerical values from finite element analysis, while the second type of characteristic values are compared with various human comfort threshold values found in international standards.

Quality Control of Multichannel Hematology Analyzers: Bivariate On-line Comparison of MCV and MCH Values for the Detection of Random Errors

1992 ◽  
Vol 97 (5) ◽  
pp. 645-651
Author(s):  
Veli Kairisto ◽  
Timo Kouri ◽  
Allan Rajamäki ◽  
Arja Virtanen ◽  
Esa Uusipaikka ◽  
...  
Keyword(s):  
Quality Control ◽  
Random Errors ◽  
On Line ◽  
Hematology Analyzers

Boosting the Capabilities of Gas Stand Data Acquisition and Control Systems by Using a Digital Twin Based on a Holistic Turbocharger Model

2021 ◽  
Author(s):  
José R. Serrano ◽  
Luis Miguel García-Cuevas ◽  
Vishnu Samala ◽  
Juan Antonio López-Carrillo ◽  
Holger Mai
Keyword(s):  
Data Acquisition ◽  
Control Systems ◽  
Heat Fluxes ◽  
Testing Time ◽  
Time Saving ◽  
Digital Twin ◽  
Dimensional Modeling ◽  
On Line ◽  
And Control

Abstract During the last decade, increasingly advanced turbocharger models have been developed for sizing, engine matching and one-dimensional modeling. This work goes further and, instead of using these models for turbocharged engines design or analysis, it implements them in the data acquisition and control system of a turbocharger gas stand. This way, interesting new capabilities arise. The paper shows that there are important synergies between advanced turbocharger gas stand data acquisition and control systems and the modern turbocharger holistic models that have not been deeply exploited until now. They can be summarized as: on-line heat fluxes analysis, in-situ outlier testing points detection, testing time saving and using digital-twin techniques to monitor turbocharger health during testing.

A STRUCTURAL APPROACH TO ON-LINE CHARACTER RECOGNITION: SYSTEM DESIGN AND APPLICATIONS

1991 ◽  
Vol 05 (01n02) ◽  
pp. 311-335 ◽  
Author(s):  
FATHALLAH NOUBOUD ◽  
RÉJEAN PLAMONDON
Keyword(s):  
Character Recognition ◽  
Computation Time ◽  
Experimental Tests ◽  
Recognition System ◽  
Structural Approach ◽  
Chain Code ◽  
String Comparison ◽  
Average Computation Time ◽  
On Line ◽  
A Chain

This paper presents a real-time constraint-free handprinted character recognition system based on a structural approach. After the preprocessing operation, a chain code is extracted to represent the character. The classification is based on the use of a processor dedicated to string comparison. The average computation time to recognize a character is about 0.07 seconds. During the learning step, the user can define any set of characters or symbols to be recognized by the system. Thus there are no constraints on the handprinting. The experimental tests show a high degree of accuracy (96%) for writer-dependent applications. Comparisons with other system and methods are discussed. We also present a comparison between the processor used in this system and the Wagner and Fischer algorithm. Finally, we describe some applications of the system.

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