The concept of trusted computing and its technologies, such as TPM, more than a decade that has been used in personal computers and servers. But only in recent years, the application of these concepts
Electrical Vehicles (EVs) powered along their way are an attractive option since they are safe, lightweight, and have unlimited cruising range. In this work a novel moving field inductive power transfer (MFIPT) system for on the road powering of electric vehicles is presented. The MFIPT system is based on stationary primary coils linearly arranged along one or several tracks of a roadway and a secondary coil in each EV.In this arrangement only the primary coils in the roadway under the vehicles are activated. The active primary coil acts as a switched resonant converter. When switching from one primary coil to the subsequent primary coil on the track, in order to follow the moving vehicle, the electric and magnetic energies stored in the coils and capacitors are passed on to the subsequent coils and capacitors in order to avoid loss of the stored energy.
Structure of electromagnetic waves and their propagation features that obtain communication are examined frequently. In the systems that wireless communication and living spaces are nested, the effects of electromagnetic waves to the environment which waves exist must also be examined. Because there are lots of national and international limitations for all services that operate in the UHF and VHF bands which have wide usage in daily life. The limitations are based on safety distance and electric field strength or power density which are determined as limit values. In this paper, it was studied on the determination of the electric field strength which is produced by the broadcast transmitter antenna masts at the Trabzon - Boztepe region and the evaluation of these measured values according to limitations. The measured values were tested with a limitation test that uses ICNIRP and IEEE as references. All the results were below the limitations.
In this work, an intelligent recognition system is developed to determine the type of power quality events which cause power quality problems. Three phase voltage signals are used to determine the types of power quality events. In the first step of this recognition system, normalization and segmentation processes are applied to the three phase voltage signals. In the second step, wavelet transform method is applied to the voltage signals and wavelet transform coefficients are obtained. Later, the two phase feature extraction process is applied to these coefficients and an effective feature vector which stands for the distinctive features of voltage signals and reduces the data size. In the last step of the intelligent recognition system, power quality event types are determined by using an artificial neural network classifier Simulation data obtained from the ATP/EMTP model are used to evaluate the performance of the developed system. According to the results, the recognition system is classified the three phase event types very accurately.
In this study, performance of wavelet transform based features for the speech / music discrimination task has been investigated. In order to extract wavelet domain features, discrete and complex wavelet transforms have been used. The performance of the proposed feature set has been compared with a feature set constructed from the most common time, frequency and cepstral domain features used in speech/music discrimination such as number of zero crossings, spectral centroid, spectral flux and mel cepstral coefficients. In order to measure the performances of the feature sets for the speech/music discrimination, artificial neural networks have been used as a classification tool. The principal component analysis has been applied to eliminate the correlated features before classification stage. Considering the number of vanishing moments and orthogonality, the best performance is obtained with Daubechies8 wavelet among the other members.
7 level cascaded voltage source inverter structure is presented as Static Synchronous Compensator (STATCOM). Selective harmonic elimination method, synchronous reference frame instantaneous reactive power theory [1] method is applied. DC link capacitors voltage control algorithm is also used. Performance of STATCOM is examined in instantaneous load change from capacitive to inductive and vice versa. Rapid prototyping is applied for STATCOM. Matlab simulation and Matlab-DSP coworking simulation results are compared.
In this paper, a transfer matrix factorization based synthesis algorithm for resistively terminated high-pass LC ladder networks is presented. In the algorithm, component value of the extracted element and the scattering transfer matrix of the remaining network are formulated in terms of scattering transfer matrix coefficients of the whole network. An example is presented to exhibit the application of the proposed synthesis algorithm
Frequency selective channel distortions in the Multi Carrier Code Division Multiple Access (MC-CDMA) system is reduced with the use of guard interval. In previous works, guard interval is associated with root mean square delay spread of the channel (τ rms ) and the symbol duration. This paper investigates the sensitivity of MC-CDMA performance to guard interval and demonstrates a novel approach to determine the Optimum Guard Interval (OGI). System performance is determined from the Signal to Noise Ratio (SNR) level of a detected bit. The OGI for a given channel profile and system parameters is determined as the guard interval with maximum SNR. Unlike the previous studies, the OGI was investigated for different E s /N 0 . The OGI are growing increasingly with E s /N 0 and is equal to maximum delay spread for E s /N 0 =30dB. We show that the OGI used depending on E s /N 0 can be selected as the delay window that includes certain multipath power. With such a method with different frequency selective channel profile the optimum guard interval without the need for complex operations can be identified.
Blind Source Separation (BSS) is a process which includes detection of the individual source signals from mixed different sources. BSS can be used for image processing, communication and biomedical applications. To achieve BSS different techniques are used. Independent Component Analysis (ICA) is used for it frequently. In this study, to realize BSS, applicability of ICA on a portable environment TMS320C6713 DSK kit is tested with three different application. Jean François CARDOSO's JADE (Joint Approximate Diagonalization of Eigenmatrices) Algorithm is used for the realization of ICA. Test signals stored in PC are sent to TMS320C6713 DSK kit via Real Time Data Exchange. Blind Source Separation is achieved on TMS320C6713 DSK kit by using JADE algorithm.
Software defined instrumentation technique provides us with user specific but also easily adaptable and reconfigurable devices instead of unadoptable and non-flexible conventional devices. In the future, it is expected that in an emergency case software defined devices facilitates the communication between different organizations and increase the capability of organizations for common operations. In this paper, APCO Project-25 the digital radio standard, an open architecture public safety digital radio standard widely used in the world like Turkey, has been implemented on a radio platform by using software defined instrumentation technique and the communication between this platform and the commercial hand-held radio 4700, produced by ASELSAN, has been tested. Furthermore, it is demonstrated that a new or hybrid standard can run on the same platform by modifying the software according to the needs, fast and cheap implementation aspects of the Software Defined Instrumentation technique is emphasized.
A three-stage low noise ultra-wide band amplifier for 0.5GHz–15GHz frequency band has been designed in Silicon-Germanium hetero junction bipolar technology using AMS 0.35µ BiCMOS process. Simulation results in CADENCE Spectra show input return loss of 14dB and a gain of 33dB along the band of interest. The gain curve of the first stage, which has been optimized for the input impedance matching along the full band of interest, is straightened by using the gain characteristic of the Cascode stage which has been added as second stage. The simulation results of the studied LNA have been compared with referenced low noise amplifiers and showed the achievement of better gain level along a wider band while providing the noise figure and impedance matching requirements.
Parallel cables used with the aim of meet growing energy demand at the energy systems which operates via cable. To use of parallel cables may bring out imbalance among the cables. This event, known as the current distribution imbalance, cause problems such as over heating on the high current-carrying cables, wear out of insulation and reduced life expectancy. In this study, effects of cable configurations by changing phase sequences and layouts are investigated via data obtained from a data center which recently goes a major upgrade. The cable configuration which has the most uniform current distribution is determined.
History has marked a large number of man endeavours towards building machines that are capable of performing arithmetic operations more efficiently than he can do himself. These started with very primitive instruments but evolved over the course of time due to the accumulative knowledge of man kind. In the recent decades, many computer architectures exhibiting various design methodologies and computation models have been developed. One of the most widely accepted of which is von-Neumann architecture.
Recently multilevel inverter technology has been a very important alternative in the applications which requires multiple separated DC voltage sources such as solar and fuel cells. But as the number of levels and switching devices which must be used increase circuit becomes more open to faults. Furthermore the complexity of both the circuit and the control method rises. In this paper an improved cascaded multilevel inverter topology which is developed by taking advantage of recent studies is presented. To avoid system to be affected adversely, a control strategy based on harmonic elimination in fundamental frequency with determining switching angles by using Newton-Raphson method is also introduced.
Transmission congestion has become a new challenge in an open-access environment of electric power systems. In today's world, electric transmission networks have been so much loaded that such a case has never been observed before. It is mainly because of deregulation in the electricity industry and utilization of renewable energy resources for power generation. Under these circumstances, management of transmission congestion is a crucial task to successfully operate power systems and to plan new additions to the current power grid. The first objective of this study is to determine maximum amount of possible power transfer between a load bus and a generator bus of interest in the running system. The second objective is to detect load centers that are not congested for power transmission from a newly-built power plant such as a wind farm, a solar power plant, and a small size hydro dam. In order to identify congestion in transmission networks, power-flow solutions have been examined for various load and generation levels. Under the condition that additional generation is supplied and the corresponding load is demanded, the power-flow program developed by the authors of the paper has been run. After a base case solution of the power flow is obtained, a load bus and a generator bus have been selected to apply incremental changes in real power and reactive power. The scenarios for simulations of this research work are based on applying equal amount of power as load and generation for the selected buses. To assess the real and reactive power capacities of a selected bus, the P-V curve and the Q-V curve for the selected bus have been plotted by running the power-flow program to get bus voltages versus real and reactive power. As a result of this process, the real and reactive power capacities of the selected bus and information about the congested parts of the power network have been obtained. Therefore, such information is provided for power utilities to manage power eff- - iciently and for power marketers to sell power economically.
Partial discharges which may occur in high-voltage devices under operation can cause major problems in time such as, breakdown, short circuit, system failure and power interruption. Therefore the work to be done is to ensure early detection of failures in electrical insulating materials. Partial discharge measurements conducted both in laboratory environment or on-site are usually exposed to noise originated from measurement circuit or surrounding environment and these effects prevent reasonable evaluation of measurement results. In this study, use of multi-resolution analysis in order to filter out noise from partial discharge data acquired in a laboratory is presented. By applying the defined method to acquired partial discharge signals it has been made possible to determine partial discharge parameters from the de-noised signals.
In health organizations both in the world and in our country, novel standards have been developed and necessary operations are carried out in order to provide the security of patients and stuff and increase the quality of service in the route of technological opportunities. A well-known system of these is the “Nurse Call System”. Besides, emergency color codes are also developed for increasing the quality of service and security in hospitals in the world and in Turkiye. In this study, a nurse-call system(HemSis) is designed to operate in coordination with the “blue-code” system of emergency color codes. In order to realize the system in accordance with the hospital requirements, opinions and comments of doctors and nurses from Dokuz Eylul University are considered and the system is shaped in the direction of these demands. The realized system is constructed in a whole service and a positive feed-back is received related to the trial results.
By using Wireless Sensor Networks information from the environment may collected by interactive manner and can make changes depending on this data where necessary. In this paper, living or object that allows the monitoring in a determined area is designed by using WSN. Localization techniques are depended on RSSI (Received Signal Strength Indicator) value and time synchronization is given on the designed hardware.
The combination of indirect matrix converter with direct torque control is a way towards energy-saving of the world. This paper investigates the use of four-step switching in rectifier bridge of indirect matrix converters to reduce the electromagnetic torque ripple which appears when direct torque control technique is used in induction motors. By suitably selecting switching pattern, the electromagnetic torque ripple of the motor is effectively reduced. Indirect matrix converter has no electrolytic capacitors in the DC link, which results that volume and size of converter reduced and increased longevity. Using this switching strategy, the advantages of the DTC schemes and the benefits of the indirect matrix converters can be combined. The simulation results of DTC system based on IMC and the comparison of motor performance under the proposed control system with respect to those obtained under conventional DTC confirms its effectiveness and accuracy.
The fault detection based upon multivariate statistical projection method (such as principal component analysis, PCA) have attracted more and more interest in academic research and engineering practice. PCA methods for fault detection use data collected from a steady-state process to monitor T2 and Q statistics with a calculated control limit. In this paper, PCA and statistical control chart (SCC) have been used to detect process operating sensor and actuator faults on an electromechanical system. Hotelling, T2, statistic is used calculating the control limits of SCC. Experimental results indicate that the method is effective and available.
