<abstract xmlns="http://www.w3.org/1999/xhtml">This work explores beam forming and two-way relaying to alleviate the dual issues of the spectrum congestion and spectrum under-utilization. These problems can be alleviated by the implementation of underlay cognitive radio networks. However, their reliability, capacity or power, and coverage depend on bi-directional or abbreviated as primary-to-secondary (P2S) and secondary-to-primary (S2P) interference constraints. This work makes of two-way relaying to improve these essential and paramount efficiencies, performance and effectiveness measures.</abstract>

Next Generation Mobile Communication System with Cognitive Radio, OFDM and Beamforming Tecnique

<abstract xmlns="http://www.w3.org/1999/xhtml">In this paper is presented a numerical method for measurement and analysis of the charging characteristics I-λ-t (battery current-irradiance-time) of storage batteries for photovoltaic (PV) power systems. The experimental data is obtained from the PV modules by a data acquisition system built in the charger component. An algorithm developed as a Matlab source code is used to model the charging characteristics of the batteries connected to a PV system. Using the interpolation method, the mathematical function of total battery current and depending on time and illumination are obtained. The numerical values of the errors between the theoretical and experimental results prove the accuracy of the proposed method.</abstract>

Modeling the I- λ-T Characteristic for Photovoltaic Systems Storage Batteries During Charging Process

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper presents the main electrical loads that require reactive power, evaluating also its value in different operating states of the industrial installation (permanent sinusoidal or distorted). Also, the effects of reactive power flow in the networks are quantitatively estimated and accordingly, a series of specific power quality indicators (e.g. power factor, crest factor, total harmonic distortion) are highlighted. Different types of solutions dedicated to reduce the level of reactive power are also suggested. The proper design of the power factor correction systems is directly correlated with the consumer power quality parameters. A case-study will round up the work, underling the major importance of the reactive power flow in modern electric installations.</abstract>

On the Correction of the Power Factor in Modern Low-Voltage Power Electrical Installations

<abstract xmlns="http://www.w3.org/1999/xhtml">This work focuses on studying signal detection using three different equalization techniques, namely: Zero Forcing (ZF), Minimum Mean Square Error (MMSE) and Beam Forming (BF), for a 4×4 MIMO-system. Results show that ZF equalization is the simplest technique for signal detection, However, Beam Forming (BF) gives better Bit Error Rate (BER) performances at high Signal to Noise Ratio (SNR) values with some complexity in design. For more antennas at the base station, it is too complex to design the weight matrix for ZF, however, it is suitable for BF with the help of good quality digital signal processors. Performance of MIMO-system, with 8 antennas at the base station using BF equalization, is analysed to get BER values at different SNR. Results show a considerable improvement in BER for 8 antennas at the base station.</abstract>

Design, Analysis of 4×4 and 8×8 MIMO System with ZF, MMSE and BF Techniques

<abstract xmlns="http://www.w3.org/1999/xhtml">If the electrons and holes in excess are created in a semiconductor, either by means of light absorption, or using other methods, the thermic balance is disturbed, therefore these electrons and holes should be nullified after the source had been stopped. This process is named recombination. There are three main recombination types: radioactive, Auger and deep energy level recombination. All three are based on the doping concentration to a certain point. The life time is determined using the three recombination processes in semiconductor.</abstract>

Determination of the Lifetime Influence Upon the Conversion Efficiency of the Photovoltaic Silicon Solar Cells

<abstract xmlns="http://www.w3.org/1999/xhtml">This paper presents the magnetic cardiac stimulation, more precisely the stimulation with an electric field produced by a time-variable magnetic field. The modeling within this domain has in view the investigation of the induced currents in the body and the characteristics of the defibrillation coil (shape, number of turns, length) and the applied stimulus.</abstract>

Cardiac Stimulation Through Induced Currents

<abstract xmlns="http://www.w3.org/1999/xhtml">Researchers have already proved that data consumption in coming years will increase by leaps and bounds, so the present technologies like 3G, OFDM (Orthogonal Frequency Division Multiplexing) cannot hold the addition of huge capacitance, data use and demand of high data-rate. Hence, on that point is a necessity of fifth generation mobile communication system (5G). Presently the rollout for 5G is going virtually everywhere in the world and among several issues; selection of better modulation techniques is seen as unitary of the significant issues in the implementation of the 5G. In this work, we designed and analyse the performance of OFDM and FBMC (Filter Band Multi Carrier) multicarrier modulation schemes on the basis of Bit Error rate (BER) and Signal to Noise Ratio (SNR). Simulation results and mathematical analysis have confirmed that the performance and spectrum utilization of FBMC is better or equivalent as compared to OFDM, which can be very useful in next generation mobile communication and Internet of Things (IOT).</abstract>

Design and Performance Analysis of OFDM and FBMC Modulation Techniques

<abstract xmlns="http://www.w3.org/1999/xhtml">In the last decades, rhinology has developed in a great manner concerning new surgical techniques and extending the use of compatible biomaterials in order to achieve normal morphology and normal functional aspect after surgery (endoscopic or open approach). Since biomaterials are integrated in biological active organs and systems, they have to be easily accepted by the receiver with no toxicity, inflammation or other side effects. The authors try to review all biocompatible materials used in several rhinological pathologies in order to obtain the best results after functional or reconstructive surgery. In rhinological surgery there are usually used homograft’s but the use of biomaterials like alloplastics (silicone, high density polyethylene, polytetrafluoroethylene, etc.) has widely increased. The authors present their experience in endoscopic approach of choanal atresia using nasal stents, closure techniques for septal perforation using nasal splints, endoscopic drainage and sinus ventilation using balloon sinuplasty, lacrimal pathway obstruction using double margin stent and some materials used in cosmetic and reconstructive rhinoplasty.</abstract>

Institute of Phonoaudiology and Functional ENT Surgery “Prof. Dr. D. Hociota”

University of Medicine and Pharmacy “Carol Davila”

Compatible Biomaterials Used In Rhinology Surgery – Our Expertise

<abstract xmlns="http://www.w3.org/1999/xhtml">Present manuscript deals with the biometric identification and security. Features exploited for the purpose are the principal lines of the palm of an individual. We developed an algorithm which extracts palm region from a human hand, calculates few palm specific parameters using only principal lines that differentiate one palm from another and then verifies it against a database which contain s the palms of the registered users.</abstract>

Department of Electronics and Communication Engineering

Jaypee University of Information Technology

A Simple Technique for Palm Recognition Using Major Lines

<abstract xmlns="http://www.w3.org/1999/xhtml">Nowadays, the use of remote monitoring and transmission of vital parameters became extremely common, because these systems reduce the degree of risk among ill people and provide an additional time necessary for the intervention teams - in case of emergency action. Generally, these devices monitor and transmit data as values of blood pressure and the heart rate. This equipment permanently worn by the ill people have as sources of electric energy supply batteries or accumulators. The behavior of batteries and the parameters measurement for different operating states are defined as particularly important analyses, especially in terms of voltage and time. In this article we have analyzed two types of batteries (Lithium-Ion and Nickel-Metal Hydride) with different characteristics, using a monitoring device that measures the depth of discharge (DOD) while under load in our biomedical system. The battery characterizations were made while the system was operating measuring the body signs and transmitting the data.</abstract>

Characteristics Analysis of Battery Used in Equipment for Monitoring and Remote Transmission of Vital Human Parameters

<abstract xmlns="http://www.w3.org/1999/xhtml">The article emphasizes certain specific issues that a small and medium enterprise can encounter in terms of deviation from the rules regulating the quality of electrical power, as well as a couple suggestions for their regulation.</abstract>

New Approaches in the Consumer - Supplier Relationship Regarding Malfunctions in the Electroenergetic Systems and from the Perspective of the IoT Development

<abstract xmlns="http://www.w3.org/1999/xhtml">The study aims for the development of a unique positioning system in the world of microscopy consisting of a transducer and software application. The technology used is based on image processing which creates a special hardware (transducer). The virtual labeling is the essential idea of this system. It synchronizes two essential things: the actual object and a set of exact coordinates to be retained in a database, with the ultimate goal of relocating them by bringing them into the visual field.</abstract>

Positioning system in microscopic spaces (μ-GPS)

AHEAD OF PRINT

Volume 23 (2023): Issue 2 (December 2023)

Volume 23 (2023): Issue 1 (September 2023)

Volume 22 (2022): Issue 2 (December 2022)

Volume 22 (2022): Issue 1 (July 2022)

Volume 21 (2021): Issue 2 (December 2021)

Volume 21 (2021): Issue 1 (April 2021)

Volume 20 (2020): Issue 1 (April 2020)

Volume 19 (2019): Issue 2 (October 2019)

Volume 19 (2019): Issue 1 (April 2019)

Volume 18 (2018): Issue 2 (October 2018)

Volume 18 (2018): Issue 1 (April 2018)

Volume 17 (2017): Issue 2 (October 2017)

The Scientific Bulletin of Electrical Engineering Faculty

 Although the beginning of higher education in Targoviste has its roots in the Middle Ages, it became official and institutionalized after 1990, when, on the 1st of June 1992 University Valahia of Targoviste was set up.  Since 1994, regularly, the scientific life of University was gradually enriched with the first volumes of Annals of Valahia University. Starting from the year 2000, the Faculty of Electrical Engineering periodically organizes the “International Symposium on Electrical Engineering” – ISEE, a national and international scientific event, its works being published with the support of Bibliotheca Publishing House in a special Proceedings volume.  A qualitative step was made with the first issue of the journal „The Scientific Bulletin of Electrical Engineering Faculty - SBEEF” in 2001, which provided to the electrical engineering community an important instrument to express the scientific engineering creation. At the same time, through the strategy for the selection and publication of best scientific contributions, „The Scientific Bulletin of Electrical Engineering Faculty - SBEEF” has constantly followed to manifest the leadership position in education and research in the electrical engineering field.  Currently, the journal encourages and strengthens the scientific cooperation at international level, by conducting exchanges with the journals of several well-known national and international institutions. The editorial committee and reviewers of SBEEF are composed by prestigious personalities of the academic and research life, both at national level – Romanian Academy, University Politehnica of Bucharest, University of Oradea, University of Pitesti, Technical University “Gh. Asachi” Iasi, University Dunarea de Jos of Galati, Univerrsity of Medicine and Pharmacy “Carol Davilla” of Bucharest, CEZ Trade Romania, ICPE Bucharest, University Valahia of Targoviste, and at international level – Politecnico di Torino, University of Poitiers, Technical University of Copenhagen, University of Patras, Polytechnic University of Warsaw, University of Tampere, Technical University of Melbourne, University of Valladolid, Canadian Institute Energy, Technical University of Fes, Institute for Research ABB-Schwartz of Geneva, University of Louvain, Belgium, Univ. Paris8, IUT de Montreuil, University of Zaragoza, Grenoble Institute of Technology, Energy System Institute SB RAS, Irkutsk, Universidade Federal de Santa Catarina Florianopolis, University of Ulster, Nevsehir Haci Bektas University.  The editorial committee receives and analyzes the contributions of authors, the review activities being made in the frame of two main sections, which of them contains eleven subsections, Section A: Electric Circuit Theory and Analysis, Renewable Energy Sources, Electromagnetic Compatibility/Power Quality, Energy Efficiency, Electrical Machines and Drives, Power Systems, Computational Electromagnetic, Materials for Electrotechnics, Measurements Techniques/Virtual Instrumentation/Sensors and Transducers, CAD in Electrical Engineering, and Biomedical Engineering, and Section B: Control Systems, Artificial Intelligence Techniques, Modeling and Simulation, Distributed Systems, Real-time Systems, Telecommunications Technologies and Software, Signals and Image Processing, E-learning, Applied Informatics, Robotics, Educational use of ICT. On these lines, in the Editorial Board academia professors and researchers with scientific competences were co-opted – all of them fully recognized by the scientific international community. The peer-review process of the manuscript proposed for publication in „The Scientific Bulletin of Electrical Engineering Faculty” is conducted in accordance with the common international procedures, including anti-plagiarism verification.  For all the authors, whose number has increased continuously, the doors for affirmation are permanently opened in all the scientific fields of electrical and electronic engineering, power systems, and computer science and also in biomedical engineering and their chirurgical applications. In addition, even if the journal had initially an annual occurrence, in 2008 and 2009 two numbers saw the light of printing and since 2010 there were three occurrences every year and since 2013, 4 volumes every year. Since 2008 SBEEF is indexed in international database Index Copernicus Master List Journals  journals.indexcopernicus.com/karta.php?action=masterlist&amp;id=3797 with IC value 3,61 for 2009, 4,41 for 2010, 4,91 for 2011, 5,19 for 2012, 5,27 for 2013, and 6.5 for 2014.  On behalf of the editors we invite scientific researchers, specialists and teachers involved in electrical engineering and in close areas to work for the preparation and publication of their scientific contributions in the „The Scientific Bulletin of Electrical Engineering Faculty”.   Rejection Rate   8%   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 