scholarly journals Informational uncertainty of measuring instruments

2021 ◽  
pp. 15-19
Author(s):  
Gennadii Manko ◽  
Elena Titova
Keyword(s):  
Traditional Approach ◽  
Measuring Instruments ◽  
Information Uncertainty ◽  
Measuring Instrument ◽  
Accuracy Class ◽  
Information Approach ◽  
Theory Of Measurements ◽  
Informational Uncertainty ◽  
Concept Of Information

Recently, there has been a revival of interest in the use of the information approach in the theory of measurements. Unlike the traditional approach, information theory does not evaluate error or uncertainty, but entropy and the amount of information. This article analyzes a number of recent publications that develop ideas for the information approach. The limitations and disadvantages of both the entropy approach and the concept of uncertainty are indicated. As a compromise solution, it is proposed to use a criterion based on the Bongard’s uncertainty and useful information. The concept of information uncertainty is proposed, which is estimated by the amount of negative useful information, that is, misinformation introduced by the measuring instrument. Some methods for calculating information uncertainty are described. The problems of using the uncertainty approach are noted. This approach does not imply the use of such a generalized characteristic of measuring instruments as an accuracy class. The article proposes an analogue of the accuracy class in the form of relative informational uncertainty, expressed as a percentage. This will make it possible to evaluate the quality of the measuring instrument by a single parameter, the calculation of which requires a minimum of computational operations.

scholarly journals Comparative research of quality indicators of measuring instruments: practical aspects

2021 ◽  
pp. 24-30
Author(s):  
Oleh Velychko ◽  
Tatiana Gordiyenko
Keyword(s):  
Quality Indicators ◽  
Metrological Characteristic ◽  
Comparative Research ◽  
Comparative Evaluation ◽  
Measurement Information ◽  
Measuring Instruments ◽  
Expert Evaluation ◽  
Measuring Instrument ◽  
Reliable Measurement

The main purpose of modern measuring instrument MI is to perform accurate and reliable measurements in order to obtain complete and reliable measurement information. The MI must be of proper quality, which must be reliably assessed. For technical means, traditional quality indicators have been established, some of which are common to MI. The metrological characteristic is unique to a MI and can be considered one of the most important of MI indicators. The quality of MI is characterized by a certain system of quality indicators. Depending on MI group, the system of quality indicators can differ. The target indicators are specific for each type of product. These indicators require additional analysis. The main metrological characteristics should be referred to the target indicators of MI. For some MI categories, additional indicators can be established, and for others, they are excluded. The methodology of evaluation of MI quality indicators and algorithm of its realization are offered. The digital multimeters as category of MI have been selected for practical comparative evaluation of MI quality indicators. The ten indicators for this category of MI have been refined. Comparative expert evaluation of quality indicators of 12 multimeters was carried out with the involvement of a group of 34 metrology experts. The weight of each of the 10 selected MI quality indicators was determined. The results of expert evaluation of multimeter are presented.

scholarly journals Calibration of Dial Indicator Using Calibration Tester with JIS B 7503 Standard

2021 ◽  
Vol 65 (2) ◽  
pp. 82-87
Author(s):  
Dodi S. Arief ◽  
◽  
Amri Pahlevi ◽  
Agus S. Permana ◽  
◽  
...  
Keyword(s):  
Production Process ◽  
Time Limit ◽  
Measuring Instruments ◽  
Measuring Instrument ◽  
Calibration Process ◽  
Measurement Results ◽  
Good Measurement ◽  
Dial Indicator ◽  
Predetermined Time

The measurement process is the most important part of the production process in the industrial world. Obtaining good measurement results can not be separated from using measuring instruments that are always maintained. Subsequence, the maintenance of calibration procedures must be carried out periodically based on a predetermined time limit. The calibration process is an activity to compare standard quantities between measuring instruments and testers that are in accordance with the measuring instrument and carried out periodically. The implementation of the calibration process often has generates an uneven value where this value is better known as the uncertainty value. This research objective is to determine the uncertainty value of the measuring instrument of a dial indicator using the JIS B 7503 Standard. The calibration can control the quality of the equipment used, and can show whether the tool is feasible or not to be used.

METHOD FOR ESTIMATING ERRORS IN MEASURING INSTRUMENTS BY THE SPACE CATALOGUE ORBITS

2018 ◽  
pp. 76-84
Author(s):  
K. V. Sorokin ◽  
E. A. Sunarchina
Keyword(s):  
Dynamic Model ◽  
New Method ◽  
Measuring Instruments ◽  
Measuring Instrument ◽  
Software Complex

Improvement of orbits precision is one of the most important tasks of space surveillance catalogue maintenance. The solution of this problem is directly related to an adequate consideration of the errors of the coordinate information from the measuring instruments. The article consideresd a new method for estimating the precision of measuring instruments on the catalog orbits. To carry out such analysis, in PJSC «VIMPEL» special technological program was created. Main results of a study of radar errors with orbits of space surveillance catalogue was presented. Also, the results were compared with data of measuring instrument's calibration software complex. This software complex provides determination of satellite's position with errors less than 10 m. A new dynamic model of measuring instrument errors is proposed.

scholarly journals Spatiotemporal Fusion of Formosat-2 and Landsat-8 Satellite Images: A Comparison of “Super Resolution-Then-Blend” and “Blend-Then-Super Resolution” Approaches

2021 ◽  
Vol 13 (4) ◽  
pp. 606
Author(s):  
Tee-Ann Teo ◽  
Yu-Ju Fu
Keyword(s):  
Satellite Images ◽  
Traditional Approach ◽  
Spectral Band ◽  
Super Resolution ◽  
High Temporal Resolution ◽  
Landsat 8 ◽  
Fusion Model ◽  
Image Blending ◽  
Fine Resolution

The spatiotemporal fusion technique has the advantages of generating time-series images with high-spatial and high-temporal resolution from coarse-resolution to fine-resolution images. A hybrid fusion method that integrates image blending (i.e., spatial and temporal adaptive reflectance fusion model, STARFM) and super-resolution (i.e., very deep super resolution, VDSR) techniques for the spatiotemporal fusion of 8 m Formosat-2 and 30 m Landsat-8 satellite images is proposed. Two different fusion approaches, namely Blend-then-Super-Resolution and Super-Resolution (SR)-then-Blend, were developed to improve the results of spatiotemporal fusion. The SR-then-Blend approach performs SR before image blending. The SR refines the image resampling stage on generating the same pixel-size of coarse- and fine-resolution images. The Blend-then-SR approach is aimed at refining the spatial details after image blending. Several quality indices were used to analyze the quality of the different fusion approaches. Experimental results showed that the performance of the hybrid method is slightly better than the traditional approach. Images obtained using SR-then-Blend are more similar to the real observed images compared with images acquired using Blend-then-SR. The overall mean bias of SR-then-Blend was 4% lower than Blend-then-SR, and nearly 3% improvement for overall standard deviation in SR-B. The VDSR technique reduces the systematic deviation in spectral band between Formosat-2 and Landsat-8 satellite images. The integration of STARFM and the VDSR model is useful for improving the quality of spatiotemporal fusion.

scholarly journals Comparative Study of Burnout in Professional Caregivers of Institutionalized Elderly with Dementia and other Diseases

2011 ◽  
Vol 1 (2) ◽  
pp. 61-70
Author(s):  
Inmaculada Méndez ◽  
Esther Secanilla ◽  
Juan P. Martínez ◽  
Josefa Navarro
Keyword(s):  
Quality Of Life ◽  
Ad Hoc ◽  
Maslach Burnout Inventory ◽  
Well Being ◽  
Measuring Instruments ◽  
Global Approach ◽  
People With Dementia ◽  
Quality Of Patient Care ◽  
Psychoeducational Programs

In a global approach about the need of paying attention to staff working with and for older people with dementia and other diseases in residential care, it is necessary to investigate their emotional well-being to provide strategies to improve their quality of life and therefore their quality of patient care. Professional caregivers of people with dementia and other diseases have specific psycho-sociological problems. They are more prone to stress which can sometimes lead to the “burnout” due to specific functions in the workplace. To define the sample was decided to compare two residential centers of two regions, Murcia and Barcelona. We proceeded to the administration of the following measuring instruments: the scale Maslach Burnout Inventory (MBI) and an ad hoc survey conducted for professional caregivers. Finally, the results offer the possibility of carrying out programs to prevent emotional exhaustion in professional carers, as well as the possibility of designing psychoeducational programs for staff care and even future proactive and reactive interventions.

Reflections on FDA and WHO recommendations concerning clinical trials

1989 ◽  
Vol 4 (2) ◽  
pp. 117-122 ◽  
Author(s):  
J.-F. Dreyfus ◽  
D. Cremniter ◽  
J.D. Guelfi
Keyword(s):  
Clinical Trials ◽  
Drug Users ◽  
Objective Evaluation ◽  
World Health ◽  
Measuring Instruments ◽  
New Techniques ◽  
The Usa ◽  
The One ◽  
Health Organization

SummaryWe are still confronted by numerous different nosographic models and problems concerning the objective evaluation of patients progress during treatment. It is interesting to consider the consequences of this situation in psychiatry which still involves a relative diversity of practical methods used in clinical trials. The recommendations of the USA Food and Drug Administration, on the one hand, constitute a highly structured and precise reference. The World Health Organization, on the other hand, promulgates general recommendations resulting from a compromise designed to satisfy the greatest number of clinicians.Despite the apparently diverse principles and the different practical methods they propose, both those sets of recommendations have been useful in inspiring clinicians to reflect upon these different methodological approaches. The qualities of the inclusion criteria used in the study of patients and the sensitivity of the different measuring instruments have allowed psychotropic drug users as well as producers to recognize the need for a certain rigour in clinical trials.The FDA and WHO guidelines have certainly improved the quality of clinical trials in psychopharmacology. However, they also represent a source of resistance to innovation.A series of consensus meetings to first reconcile US and European points of view and later to include new techniques in the recognized sets of methods would therefore be helpful.

scholarly journals A questionnaire to measure the quality of midwifery care in the postpartum period from women’s point of view: development and psychometric testing of MMAYpostpartum

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mirjam Peters ◽  
Petra Kolip ◽  
Rainhild Schäfers
Keyword(s):  
Factor Analysis ◽  
Postpartum Period ◽  
Psychometric Testing ◽  
Personal Control ◽  
Sample Survey ◽  
Measuring Instruments ◽  
Cronbach’S Alpha ◽  
Midwifery Care ◽  
Cronbach's Alpha

Abstract Background Home postpartum care is a major part of midwifery care in Germany. The user perspective plays an increasingly important role in the evaluation of health services, but there is a lack of valid and theoretically based measuring instruments, especially in midwifery care. The aim of this study was to develop and validate an instrument for measuring quality of midwifery care in the postpartum period from the perspective of women. Methods The following steps were taken to achieve this: (1) definition of the goals of midwifery work; (2) literature-based item development; (3) item selection based on a pre-test (n = 16); (4) item reduction and investigation of factor structure by means of explorative factor analysis (EFA; n = 133);(5) second EFA (n = 741) and confirmatory factor analysis (CFA; n = 744) based on a split representative sample survey; (6) hypothesis-based testing of correlations to sociodemographic characteristics of women and to characteristics of care. Results Measurement of Midwifery quality postpartum (MMAYpostpartum) consists of three scales with a total of 17 items which were found to have acceptable internal consistency: Personal Control (Cronbach’s alpha = .80), Trusting Relationship (Cronbach’s alpha = .87) and Orientation and Security (Cronbach’s alpha = .78). CFA verified and confirmed three factors: CFI = .928, TLI = .914, RMSEA = 0.073. Conclusion MMAYpostpartum is a predominantly valid, reliable short tool for evaluating the quality of midwifery care postpartum. It can be used to evaluate midwifery care, to compare different care models and in intervention research. It thus supports the orientation of midwives’ work towards the needs of women and their families.

Means for raising the quality of measuring instruments

1964 ◽  
Vol 7 (12) ◽  
pp. 1033-1035
Author(s):  
S. P. Krasivskii
Keyword(s):  
Measuring Instruments

The measurement problem of calibration of measuring instrument under specified conditions

2021 ◽  
pp. 9-15
Author(s):  
Sergey F. Levin
Keyword(s):  
Risk Assessment ◽  
Risk Management ◽  
Measurement Problem ◽  
Parametric Identification ◽  
Correction Function ◽  
Measuring Instruments ◽  
Measuring Instrument ◽  
Mathematical Apparatus ◽  
Second Stage ◽  
Assessment Techniques

The problem of calibration of measuring instruments for given conditions based on the correction function is considered as a measurement problem of structural-parametric identification of the calibration diagram. It is shown, that the correction function allows at the first stage to obtain a ratio for correcting the readings, and at the second stage to obtain a corrected measurement result, it is necessary to identify the probability distribution of possible deviations from it. An example of solving the measurement problem of calibration for given conditions is given. Negative aspects of the practice of calibration of measuring instruments are noted: carrying out calibration under normal conditions according to the methods of verification of measuring instruments; presentation of calibration results by tables of joint readings of measuring instruments and standards; the presence in the calculations of the calibration diagram of significant restrictions on the mathematical apparatus of the «Guidelines for the expression of measurement uncertainty», specified by ISO/IEC 31010:2019 “Risk management – Risk assessment techniques”.

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