The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
Frequency and magnitude evaluation are two of the main signal analysis tasks in the electrical power systems. This paper presents a simple and robust algorithm which enables an accurate estimation of the harmonic parameters of signals with unknown frequency. Differing from the existing approaches, frequency and magnitude of harmonic waves are simultaneously and precisely identified. The proposed algorithm...
In this paper, we propose a two electrodes configuration for noncontact long-term cardiac monitoring. Our system was designed as an alternative to Holter devices. Unlike a traditional long-term monitoring equipment, our system is stationary and non-contact, the cardiac signal is acquired through a capacitive coupling between the sensor and the subject's body. The proposed system is the first prototype...
The signal processing techniques based on higher-order statistics are used in many applications due to their interesting properties. These techniques are very useful when the signals are affected by the gaussian noises. In this paper the higher-order moments and the moment spectra for deterministic signals are theoretically described. An analysis of the third-order statistics for some particularly...
This paper presents a low cost solution for a framework used for recording the electric network signal and for logging the fundamental frequency variations. The resulted database is used for time stamping audio recordings based on the Pearson correlation coefficient. Furthermore, we propose a fast algorithm for computing the Pearson correlation coefficient by emplying filters to implement efficiently...
The PPM (Prediction by Partial Matching) methods are applied before the lossless compression algorithms, as a preprocessing procedure for the text in order to use efficiently the redundancy. This paper presents 4 compression algorithms preceded by 3 different PPM methods. The compression ratio is studied in relation with the file size, its content, and the context order (the prediction degree). Some...
It is generally understood that in a (digital) measuring system, attention must be paid to the criterion usually identified with the name Nyquist. The paper shows that there is no such a priori requirement. The observations of Nyquist are examined: some may seem unfamiliar. Sampling and measurement are described as different activities in the quest of information retrieval. A link to Information Theory...
This paper presents the hardware and software structures of a proposed data acquisition and processing system, which is designated to perform an automated inspection of roads pavement condition. The system was designed to gather information from multiple sources - laser-based imaging systems for road profiling, cameras for environmental images, proximity sensors, all information being spatially correlated...
One of the main goals of the network was to obtain a perfect balance between the network optimization and the central intelligence. However the service providers desired a more simplified and optimized IP network, with an increased scalability. With this aim in mind the concept of Segment Routing was created.
The paper explores the main directions in which the augmented reality and the Web can change the approach in power engineering and significantly improving it. These innovations facilitate, in a user-friendly way, the availability of real-time data, fast processed information, assistance and guidance at any time and in any place along the entire energy chain. A step-by-step implementation of AR applications...
The paper presents the opinions of students at the Electrical Engineering, University POLITEHNICA of Bucharest (UPB) regarding the teaching and assessment methods. The students' opinions depend on various socio-demographic variables discussed. The study is based on a quantitative analysis and it was conducted on 844 students studying Electrical Engineering, during May–July 2016.
Power engineering is facing major changes - some of them are captured by the smart grids newly adopted paradigm, while others are perceived as external impact of technological evolution in the traditional topics, like measurements. Here the innovation is usually reduced to smart metering initiatives. However, measurement technology is acknowledged as being a fundamental layer in the endeavor of setting...
This paper presents an analog electronic circuit which traces the current-voltage (I–V) and power-voltage (P-V) characteristics of photovoltaic (PV) devices, using an appropriate varying electronic load. The circuit is developed for teaching solar cells performance and parameters at the Department of Electronics, Ruse University “A. Kanchev”. Experimental based teaching enhances students' interest,...
This paper presents a Robotics laboratory conceived for the Electrical Engineering students. The laboratory work comprises two stages - a preliminary one, in which they apply Robotics concepts by means of ready to use platforms, and a second one, when the students are engaged in a complex project, whose goal is to develop their own platform. There are detailed the work stages, emphasizing both the...
This paper covers the design and development of a custom portable equipment, which monitors gas concentrations from new types of microsensors, stores all the data and makes it available in digital format. Using sensors with information technology will lead to improving quality and safety of the climate.
During the studies performed in two experiments, in November 2016, the researches observed an unusual phenomenon in the dynamic of the bio-energetic human shell. The effects were registered with a Bio Well device. The observed process can be compared with the mode in which a ferromagnetic material remains magnetized after the disappearance of the electromagnetic force. With other words, we assist...
In the electric equipments with oil insulation, the processes of degradation and ageing of the electroinsulating oil can occur because of the solicitations during the exploitation. These solicitations are produceing a modification of the electroinsulation properties in such a measure that the dielectric breakdown phenomenon can occur having negative consequences on the operational safety of the electric...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.