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The rotor shaft angular position accuracy of a motor is an important parameter in most of the modern control applications like avionics, control and computer applications. Resolver is an angular position transducer that provides analog form of angular position and Resolver to Digital Converters (RDCs) are always needed to recover the analog angular position in digital form. This paper provides the...
The performance of software cost estimation based on analogy reasoning depends upon the measures that specifying the similarity between software projects. This paper empirically investigates the use of probabilistic-based distance functions to improve the similarity measurement. The probabilistic-based distance functions are considerably more robust, because they collect the implicit correlation between...
Accurate software size measurement is an important factor to assure the success of software projects. COSMIC method is a widely used functional size measurement method. Improving the accuracy of COSMIC measurement concerns three factors: measurers, measurement process and software artifacts. In this paper, we proposed some combined control methods to improve the accuracy of COSMIC measurement. Experiments...
The principle of the passive optoelectronic rangefinder (POERF) is known since c. the second half of 1950s. Publications about research and development of POERF do not exist practically. Presumptive causes are presented in this contribution. We deal with POERF research and development since year 2003. The last fully functional demonstration model is from the year 2009. We present firstly its brief...
We provide results and error analysis for over four hundred individual measurements of a Near-Field Electromagnetic Ranging (NFER®) Real-Time Location System (RTLS). The system operated over ranges from 1.41m to 23.4m and the bulk of the points were taken “through wall” in a non-line-of-sight configuration. We break the error down into orthogonal range and transverse components in order to assess...
Map digitization is an important source of spatial data, and its process of production is complicated, the error generated by each step will influence the outcome of data quality. First, from perspective datasource, hardware, software and personnel factors related to map digitizing, the paper discussed the uncertainty; After that, an uniform spatial data quality model is built. Then starting from...
A small scale, high precision positioning table was developed to solve measurement problems originating from microtechnic. A construction with a single reference surface preferred and vacuum preloaded air bearing are used to enable smooth motion and eliminate stick slip. The nested tables are driven by ultrasonic piezomotors to enable submicron resolution, high speed and low health generation. The...
Accuracy of the functional size is critical in software project management, since functional size is the most prevalent input for effort and cost estimation models. Functional size measurement is performed based on standardized manuals; however, the accuracy of FSM results is still based on the knowledge and cautions of the measurers. In this study we performed a multiple case study to identify the...
A precision line scale calibration method in a dynamic regime enables to gain the calibration throughput and simplify the comparatorpsila s structure and control. However, the errors featured by geometrical deviations, static and dynamic loads as well as temperature induced deformations should be considered and incorporated into uncertainty budget. These errors contain random and systematic components...
A crucial issue in the software cost estimation area that has attracted the interest of software project managers is the selection of the best prediction method for estimating the cost of a project. Most of the prediction techniques estimate the cost from historical data. The selection of the best model is based on accuracy measures that are functions of the predictive error, whereas the significance...
This paper describes an automated procedure for verifying the characterization of mechanical tuners used in automated load-pull systems. Precise tuner characterization is critical for making accurate load-pull measurements, as small inaccuracies in the tuner S-parameters can lead to significant errors in measured results. A software routine was written to automate the tuner verification process by...
This paper presents a structural health monitoring system for monitoring, with reduced visual impact, one historical building structure. The system is based on fiber Bragg gratings and comprises 19 displacement sensors and 5 temperature sensors. All the sensors were custom made according to the monitoring points' characteristics. The results obtained over the first year of monitoring are presented...
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