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The non-iterative algorithm that reveals the general physical basis of measuring processes and instrumental (computer) computations is proposed and investigated. The algorithm is based on the previously proposed postulate and consists in finding the optimal, locally defined width of the averaging interval. The optimal width of the interval provides the smallest error when measuring or computing the...
This paper gives an overview of the calorimetric systems used to determine the losses of converters and motors, introduces the standards in the scope of the topic briefly, and highlights the problems associated with the loss determination of high efficiency devices. The calorimeters are classified in four categories based on chamber configuration. Information about previously published calorimeters...
In many real-life situations, we know the upper bound of the measurement errors, and we also know that the measurement error is the joint result of several independent small effects. In such cases, due to the Central Limit Theorem, the corresponding probability distribution is close to Gaussian, so it seems reasonable to apply the standard Gaussian-based statistical techniques to process this data...
This paper investigates the uncertainty of the day-ahead distribution system scheduling considering the random variations of both Photovoltaic-based distributed generator (PV-DG) output power and load. Instead of Monte-Carlo simulation (MCS), a two-point estimation method (2PEM) is applied to obtain accurate and computation-efficient analysis results. Based on the two-year real-world hourly weather...
The identification of online robot is important for managing the internet order, such as forbidding spam, fictitious information, and inductive words published by online robot to mislead the public. We studied the behaviors of the WeChat users to identify online robot, including turning pages, scanning the web, and forwarding posts. In fact, the amount and time interval of information forwarding were...
A modified measurement procedure for the purity determination of high purity potassium iodate is described. The procedure consists of the coulometric standardization of sodium thiosulfate by generated iodine, stoichiometric interaction of standardized sodium thiosulfate with potassium iodate and the coulometric titration of excess sodium thiosulfate by generated iodine. In the proposed measurement...
This work is devoted to the admissibility analysis for singular time-delay systems by using delta operator approach. By estimating the delay term with a two-term approximation, the singular system in delta operator domain is transformed into an interconnection of a time-invariant subsystem with constant delay and a uncertain one. By resorting to the input-output approach, a delay-range-dependent admissibility...
In this paper, we propose a predictor-based sliding mode control algorithm for LTI systems with input-delay and disturbance. It is shown that our proposed algorithm can completely reject the constant disturbance from the state channel. It is also shown that with our proposed algorithm, an enhanced disturbance rejection can be achieved for a large class of other time-varying disturbances. Simulations...
Recent years have seen an uprise in the development of middleboxes functionalities (CGNATs, proxies, accelerators, etc), participating so in the ossification of the Internet. In parallel, various solutions have been developed to detect or circumvent unwanted middleboxes interferences such as UDP-based middlebox-proof transports (Google’s QUIC, PLUS), middleboxproof extensions to TCP (HICCUPS, TCPcrypt),...
This paper describes the design and setup of different measuring systems for the calibration of commercial voltage and current transformer test sets for non-conventional instrument transformers. The calibration systems are recently developed at the national metrology institutes VSL, PTB, METAS and TUBITAK within the frame of the European project “FUTURE GRID — Non-conventional voltage and current...
In the course of the scheduling of a project we always have to face uncertainties in the planned durations of the individual activities. The most frequently used method to handle this situation, is PERT. But PERT offers some detriments like the systematic underestimation of the real risk. Therefore a further development led to the “critical field” approach, which implies the use of Monte Carlo simulation...
This paper presents the application of runs test for indirect consideration of observation's autocorrelation in estimation of a standard uncertainty of arithmetic mean value. At first stage researches were performed by Monte Carlo (MC) simulation for two kind's random signals: first order autoregression (AR) and moving averaging (MA). Comparison of theoretical values of effective number of observations...
Almost independent of the program, technology or functionality, the number one issue facing everyone is tackling the ever-increasing desire for tighter design margin. This has not only pushed designers and their simulation tools to the edge, it has kept test and test strategies one step behind the growing measurement needs. The result has been lower yields, greater false failures and a swelling number...
Inter-laboratory comparisons are important to evaluate the capabilities of EMC test laboratories. In this contribution, we present a device for such comparisons which is able to assess the test capabilities of a laboratory according to the IEC 61000-4-3 standard. The device is intended to be tested as a normal EUT. It is equipped with appropriate detecting mechanisms that record all important parameters...
Managing projects in an intercultural environment creates additional challenges for international project teams. International project teams working in such an environment should deal with issues connected with differences in time-zones, technology compatibility, communication [1], etc. Furthermore, project team members come from different cultural backgrounds, which is why, in multi-cultural projects,...
Objectives. The article proposes a modification of the method for quantitative risk assessment (the Monte Carlo simulation method) by taking into account the multifactorial relationship between the key parameters and the risk factors of the investment project, which makes it possible to obtain a more relevant and efficient sample of simulations. Methods. Investigations described in the article are...
This paper investigates curve-fitting methods to explore uncertainty quantification approaches for demand fluctuations in a power grid. Specifically, we use data sets from the Pennsylvania-New Jersey-Maryland (PJM) Interconnection, where we employ two stages of fitting. In stage one, a trigonometric based fit for historical data sets is carried out. In stage two, load forecasting for day-ahead market...
The rapidly rising penetration level of distributed generators (DGs) increases the risk of unacceptable voltages in distribution systems. The conventional voltage regulation devices are limited by physical constraints in their ability to perform voltage/var control in response to photovoltaic (PV) output fluctuations. However, the reactive power capability of PV inverters alongside with conventional...
Most systems in the real life are complex systems. In the study of complex systems, we tend to get highly uncertain information due to the dynamic and complexity of the cases and our knowledge limitations. Moreover, complex systems are compounded of many parts, and the methods of data collection and storage vary considerably. Hence, the data processed by complex systems are associated with multi-type...
• It has been shown that measured SVSWR is smaller than peak SVSWR. The measured SVSWR covers approximately 75% of the SVSWR • An method is shown to use a moving window to estimate the real SVSWR level. The site contribution to emissions measurement MIU can be derived based on the full knowledge of the SVSWR. • SVSWR of the back half of the QZ is not currently considered by the standard, but the levels...
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