Bildiri Koleksiyonu
Bu koleksiyon için kalıcı URI
Güncel Gönderiler
Öğe FPGA Implementation of RK4 based Van der Pol Oscillator(Turgut Ozal Univ, 2012) Koyuncu, İsmail; Erdoğmuş, PakizeFPGA chips have quite high speed and capacity now. They are also used in several disciplines. For high speed and performance required applications, FPGAs are of great importance since they provide flexible and low-cost solutions. Most of these applications require intensive mathematical operations and the calculations of these mathematical operations are both time consuming and difficult. Differential equations are the biggest part of such applications. This study aims to implement the Van der Pol oscillator on FPGA. In this process, the fourth order Runge-Kutta algorithm was selected as ODE solver. Van der Pol oscillator equations are quite sensitive to the parameter which specifies the nonlinearity and the strength of damping. Van der Pol oscillator's differential equations can have stiff property related to damping parameter. So, implementation performance was tested for different parameter values which make the differential equations non-stiff.Öğe Electronic Circuit Realization and Synchronization Application of Sprott 94 S Chaotic System for Secure Communication Systems(Ieee, 2013) Koyuncu, İsmail; Alçın, Murat; Pehlivan, İhsanIn this paper, the numerical model and electronic circuit model using Pspice of Sprott 94 S system is presented. The chaotic system modelling with electronic circuit elements is realized physically. Besides, the synchronization of Sprott 94 S system is fulfilled using Pspice program. In realized synchronization, Sprott 94 S chaotic oscillators that run on different initial states have been in synchronization with a very short time. The Sprott 94 S system's chaotic oscillator which is designed using analog electronic elements, has been introduced in this paper for the first time. In addition, various signal encryption and secure communication applications can be performed using the electronic circuit model of Sprott 94 S system given in this paper.Öğe Edge Dedection Application With FPGA Based Sobel Operator(Ieee, 2015) Koyuncu, İsmail; Çetin, Özdemir; Katırcıoğlu, Ferzan; Tuna, MuratImage processing can be defined as analysis of the images consists of the several steps. The edge detection process that is one of these steps can be performed using a variety of operators. Sobel edge detection operator, is a basic operator, is preferred to use with high noisy images because its corruption is insensible on images. The proposed work presents an edge detection algorithm using Sobel operator based on FPGA architecture. Proposed system is designed using IEEE 754-1985 floating-point standard and VHDL hardware description language. Design is synthesized for Xilinx Virtex-6 FPGA chip with 160 MHz operating frequency. The performance is decreed according chip statistics.Öğe Design and Implementation of Chaos Based True Random Number Generator on FPGA(Ieee, 2014) Koyuncu, İsmail; Özcerit, Ahmet Turan; Pehlivan, İhsan; Avaroğlu, ErdinçCurrently, chaotic signal generators is of importance in cryptographic applications and chaotic communication systems. One of the significant field of the chaotic signal oscillators are random number generators. In this paper, an FPGA-based new true random number generator system using discrete-time chaotic signal generator is presented. The system designed incorporates the Sprott 94 G chaotic system based on an FPGA deployed with IEEE 754 standard. In order to produce random bits a quantification process has been performed on the results produced by the chaotic oscillator unit. Furthermore, the XOR method has been determined as restoring function to obtain a true random bit generator. The maximum operating frequency of FPGA-based true random number generator has been able to reach up to 399,383 MHz. The 20,000-bit sequence has been generated by the designed system and they have been saved to the test result file. They have been tested using NIST test suite and FIPS-140-1 standards and successful results have been obtained. It is concluded that the FPGA-based system is able to be used in cryptologic applications.Öğe Women boleros found In Konya houses(Elsevier Science Bv, 2012) Abanoz, Gülden; Dursun, Filiz; Çalışan, Çiğdem DursunToday people have different needs and different expectations because of the technological developments. These differences have also affected their understanding of clothing and their taste of ornamentation. Dressing, handicrafts and ornamental works, which existed since the beginning of the history of humanity, continue to exist as the most significant and the most vivid proofs of the countries which have changed much throughout the history and of their changing national identities. One of the most important cultural properties which develop according to the economical conditions of the nations and take form according to their emotions is ornamental works. Anatolia, which has witnessed many nations throughout the history, has also witnessed the most beautiful examples of the art. With the effects of the various nations, a rich and colorful mosaic appeared in Anatolia. Without a doubt, a part of this colorful structure is traditional clothes and traditional ornamental works that are used during their ornamentation process. Designed clothes and ornamentations, by uniting the art of the era with the materials, also reflect the living conditions, the emotions and the ideas, the customs and the traditions of the period. The traditional clothes and ornamentations, which differ from one region to another, are the art works that show the delicacy, the purity and the artistic creation of the Anatolian people. The traditional clothes and the ornamental works, which were known as an irreplaceable part of Turkish clothing history and rank among our historical documents, are important data sources enlightening us about our ancestors'clothing, their ornamentation and also their customs and traditions. Besides, the reflection of the cultural features of the traditional clothes and the ornamental works that are used in their ornamentation to the the art of dressing and ornamentation, keeping cultural values alive and the emergence of the original designs are very important in terms of keeping the history alive and protecting its features. The creative features of women handicratfs, with their union with the nature, form a very rich repertoire of subjects. In the course of this research; "Women Boleros Found in Konya Houses" was selected as the subject and the features of the fabrics, colours, patterns, models and forms have been studied. These clothes have been documentated by researching via scientific techniques and their cultural features have been tried to put forward. Selection and/or peer review under responsibility of Prof. Dr. Ayse Cakir Ilhan.Öğe Usage of Inorganic Based Materials as Flame Retardants in Polymer Composites(Springer International Publishing Ag, 2018) Yılmaz, Eda; Beycioğlu, Ahmet; Aruntaş, Yılmaz; Şamandar, AyhanAlthough composite materials have been used to solve technological problems in the material industry, they have been exactly taking attention since the 1960s. Composite materials have become increasingly common engineering materials and have become widely used in many applications such as automotive parts, sporting goods, aerospace parts, consumer products and marine and petroleum products. In this work, reducing the flammability characteristic of polymer-based composites which have the carbon-based matrix due to the presence of inorganic-based compounds added during composite production was examined. Also, preliminary findings of the experimental study on the flame resistance of composite containing sepiolite, aluminum hydroxide, antimony trioxide and zinc borate were presented. Results showed that using some additional materials in mixing design improve the flammability properties of composite materials.Öğe Steady State Effects of Design Properties and Environmental Conditions on Underground Power Cable Ampacity(Ieee, 2017) Biçen, Yunus; Aras, FarukThe steady state analysis of the cables under selected design and installation conditions provide information to ensure that the cables remain within allowable operating temperature limits. Manufacturers share the ampacity levels and derating factors under certain conditions for the cables that they produced, depending on the standards. However, the diversity of conditions can increase in the real applications. In this study, ampacity comparisons have been carried out for a different design and environmental characteristics of an underground cable system. The selected parameters have been analyzed for steady-state conditions within certain ranges. Characteristic ampacity trend curves corresponding to the relevant parameter changes have been generated with iterative solutions.Öğe Real Time Hardware Implementation of the 3D Chaotic Oscillator which having Golden-Section Equilibra(Ieee, 2016) Tuna, Murat; Fidan, Can Bülent; Koyuncu, İsmail; Pehlivan, İhsanIn this study, the continuous-time, autonomous, 3D chaotic system having golden-section equilibra which is recently presented in the literature is implemented firstly as discrete time on an FPGA. In this design, the 3D chaotic system was programmed in 32-bit IQ-Math (16I-16Q) fixed-point number format using VHDL and Heun algorithm. The designed system has been synthesized and tested, using Xilinx ISE design tool, on Virtex-6 FPGA chip. According to the test results, operation frequency of the FPGA-based new chaotic signal generator is certain as 406.736MHz. In addition, chip statistics and performance results of the new chaotic oscillator are presented after the "Route&Place" processes performed on Xilinx ISE design tool. The chaotic oscillator design realized with fixed-point number format on FPGA has been shown to be use lesser chip hardware and higher operating frequency compared to the floating-point standard.Öğe Real Time Implementation of A Novel Chaotic Generator on FPGA(Ieee, 2015) Tuna, Murat; Koyuncu, İsmail; Fidan, Can Bülent; Pehlivan, İhsanIn this study, a new continuous-time autonomous chaotic system has been presented and implemented on FPGA. Presented a new chaotic system has been designed using the IEEE 754-1985 floating-point format and implemented using Heun algorithm with VHDL language. The designed system has been synthesized and tested on Xilinx Virtex-6 FPGA chip. According to the test results, operation frequency of the FPGA-based a new chaotic signal generator is certain as 390 MHz and performance results have been given with chip statistics. In addition, the results obtained from FPGA-based new chaotic generator have been compared with the Matlab-based numerical results and it has been observed that obtained results are successful. By the developed FPGA-based novel chaotic system model, chaos-based various engineering applications such as true random number generation and secure communication system can be performed.Öğe Performance analysis of three step positive input shaping(World Scientific And Engineering Acad And Soc, 2008) Gürleyük, Sırrı Sunay; Bahadır, Özgür; Türkkan, Yunus; Üşenti, HakanInput shaping is a residual vibration reducing technique for flexible structures. The desired command is convolved by a sequence of impulses to generate an input shaper so that the system reaches the set point in a minimum duration. Zero Vibration (ZV) shaper is the first form of input shaping technique. Zero Vibration and Derivative (ZVD) and Extra Insensitive (EI) are the most preferred shapers. These shapers are developed to improve the robustness respect to modeling errors. Solution of the parameters requires the derivation of constraint equations. Therefore, these shapers can only be used for linear systems. This paper presents that ZVD and El shapers are the special solutions of Three-Step (TS) input shaping space. By using TS technique, infinite number of three impulse shaper solution can be generated for both positive and negative impulse amplitudes including ZVD and El. The duration of the shaper is between ZV and ZVD. Some of them are better in robustness somewhat. Analyses and results of some specific points are given for the time-robustness compromise.Öğe Monitoring of Critical Substation Equipment(Ieee, 2015) Biçen, YunusThis paper presents lifetime monitoring algorithm available for critical substation equipment. In the remaining life calculation stage, two proposed methods named the weighted moving average - based monitoring and the trend adjusted (double) exponential smoothing - based monitoring introduced, respectively. Both methods are evaluated for various cases and the validity of the first methods tested on the prototype transformer, experimentally. However, the second newly method has advantages such as wide forecast range, trend determination capability and insensitive to short term fluctuations. These methods with the algorithms are applicable for the instrument or its parts that aging characteristics can be expressed by the empirical equations under certain stress/stresses.Öğe Intelligent Condition Monitoring Platform Combined with Multi-agent Approach for Complex Systems(Ieee, 2014) Biçen, Yunus; Aras, FarukCondition monitoring and data analysis are key factors to avoid unexpected catastrophic breakdowns and detect incipient failures. Managing of these processes are not easy in complex system which has many inputs/outputs and interdependent relationships. In conventional methods, the condition monitoring is carried out separately and systematically due to the large number of monitoring point. This paper presents an intelligent condition monitoring platform (ICMP). This platform uses multi-agent system (MAS) advantages via mathematical process named failure sensitive matrix (FSM). Through this platform, the whole system is dynamically monitored, despite all the complexity. Cause and effect relations of a fault are evaluated more comprehensively and the success of achieving global results is higher. The growth of monitoring equipment or system is not a problem, because matrix structure is expandable as wanted and its performance is fast due to the nature of the parallel computation. Other important advantage of this platform is that it is an interface which works with expert systems and artificial intelligence techniques with no restrictions.Öğe An Assessment on Aging Model of IEEE/IEC Standards for Natural and Mineral Oil-Immersed Transformer(Ieee, 2011) Biçen, Yunus; Çilliyüz, Yusuf; Aras, Faruk; Ayduğan, GüzideThis paper presents an assessment on aging model of IEEE and IEC standards using thermal model of oil-immersed power transformer for natural ester and mineral oil. For this purpose, a model created for the analysis of behavior transient thermal performance with aging both of natural ester and mineral oils. Thermal model of the transformer is based on thermal-electrical analogy that is calculated separately for natural and mineral oils covering top-oil and hot-spot temperatures. The hot-spot temperature values of each ester/oil are used to calculate aging parameters which include the aging acceleration factor, time dependent relative aging rate and insulation life loss variations.Öğe A Novel Gui Simulation Program Designed for Teaching of Underground Power Cables(Ieee Computer Soc, 2009) Biçen, Yunus; Aras, FarukThis paper presents a novel computer simulation program designed to aid teaching process in course of underground power cables for engineering students. The calculation of power cable ratings uses several different formulas and long analytical processes based on JEC 60287 and IEC 60853 standards. Therefore it is difficult to examine different variations such as power cable properties, installations and operation conditions, during the restrictive lesson time. For these reasons, a program has been developed to use for teaching process of the power cable course. The program allows the users to effectively learn the rating of underground power cables under different operation conditions with illustrative figures. The program details are presented and explained in this paper.Öğe The effect of crojenik processing on fiber parallel pressure resistance in thermowood populus tremula wood(University of Zagreb - Faculty of Forestry, 2016) Aytin, Ayhan; Korkut, S.; Çakıcıer, Nevzat; Arslan, YusufIn this study, heat-Treated Aspen (Populus tremula L.) wood was exposed to crojenik treatment, and changes in compression strength parallel to grain (CS) values were determined according to TS 2595. Firstly, heat treatment was applied on Aspen (Populus tremula L.) wood sample for 1 hour and 2 hours at 190°C and 212°C through ThermoWood Method. Then heat treated (HT) and control samples (UT) were exposed to crojenik processing at 145°C for 24 hours. Study results have showed that all cryogenic and heat treated (HTCr) samples had 24% to %54 increases in pressure resistance values compared to the control samples. This result is significant in that it contributes to application of wooden material in different areas.
