Serdaroglu, K.C. | Baydere, S.

Conference Object | 2018 | Conference of Open Innovation Association, FRUCT2018-November , pp.335 - 340

Internet of things (IoT) and fog computing based observation systems are gaining more importance as Internet becomes the main infrastructure to augment the pervasiveness in remote monitoring of the physical world. Considering the explosion in the number of connected 'things', the increase of data traffic density on interconnection devices (i.e., IoT gateways) becomes an important problem for scalable real-time emergency detection and monitoring. Thus, data traffic analysis and modeling of fog services become an important research area to get more insights into real-time behavior of such systems. The outcomes of such analysis are imp . . .ortant for prediction of IoT system behavior in a given network topology. In this paper, we elaborate on an architectural solution for periodic data acquisition from a wireless sensor network(WSN). To this end, we propose a publish/subscribe (P/S) based observation scheme which simultaneously interconnects clients to different kind of sensor devices over a fog layer service. Then, we examine the data freshness which is a critical traffic modeling parameter for real-time emergency observation. With using such scheme, we devise an analysis for understanding the behavior of the overall system in the context of data freshness. The results obtained from our experimental setup illustrate the appropriateness of freshness time calculation methods for obtaining the required service quality. © 2018 FRUCT Oy Daha fazlası Daha az

Gener, Y.S. | Goren, S. | Ugurdag, H.F.

Conference Object | 2019 | IEEE/IFIP International Conference on VLSI and System-on-Chip, VLSI-SoC2019-October , pp.52 - 57

Look-Up Table (LUT) implementation of transcendental functions often offers lower latency compared to algebraic implementations at the expense of significant area penalty. MultiPartite table method (MP) can circumvent the area problem by breaking up the implementation into multiple smaller LUTs. However, even these smaller LUTs may be big in high accuracy MP designs. Lossless LUT compression can be applied to one or more of these LUTs to further improve area and even timing in some cases. The state-of-the-art 2T-TIV and 3T-TIV methods decompose the Table of Initial Values (TIV) of MP into a table of pivots and tables of differences . . .from the pivots. Our technique, which we call Fully Random Access differential LUT (FR-dLUT), instead uses differences of consecutive elements and results in a smaller range of differences. We also propose a variant of FR-dLUT with variable length coding (Huffman) called FR-dLUT-VL, which introduces don't cares into the difference tables and lets logic synthesis optimize them out. We implemented Verilog generators of MP for sine and exponential, where TIV is a conventional LUT as well as 2T-TIV, 3T-TIV, FR-dLUT, and FR-dLUT-VL. We synthesized the generated designs on FPGA and found that our techniques produce around 10 improvement in area and timing beyond the state-of-the-art in large bit widths. © 2019 IEEE Daha fazlası Daha az

Yilmaz, H.K. | Caylak, H. | Topaloglu, S.

Conference Object | 2019 | Mediterranean Microwave Symposium2018-October , pp.272 - 275

A spurious-free synthesizer design for Fast Frequency Hopping Spread Spectrum (FFHSS) is presented in this paper. By the proposed method, a hardware is designed and this hardware is both applicable for frequency hopping receivers and transmitters which operates at L-band frequency. All the simulations and tests are conducted within the frequency range of 880 MHz to 1330 MHz. Proposed design allows very small frequency tuning step size as low as 3 Hz due to fractional Phase Lock Loop (PLL). In this work, we propose a method to mitigate in-band spurs for FFHSS by optimizing reference clock frequency. By using this method, the power of . . . spurious signals is reduced up to 40 dB for FFHSS. Different clock reference frequencies, required by Radio Frequency (RF) PLL's are ensured by using a clock distributor. Proposed design is suitable for FFHS systems with a guard time more than 200 us. © 2018 IEEE Daha fazlası Daha az

Durasi, I.M. | Dag, U. | Gungor, B.B. | Erdogan, B. | Kurnaz, I.A. | Ugur Sezerman, O.

Conference Object | 2011 | Proceedings of the 6th International Symposium on Health Informatics and Bioinformatics, HIBIT 2011 , pp.68 - 73

Transcription factors (TFs) are the proteins which regulates the expression of their target genes either in a positive or negative manner. TFs realize this task by binding to a specific DNA sequence contained in promoter regions, via their DNA binding motifs. Among ETS family TFs, Pea3 proteins are involved in the regulation of expression of genes, which are important for cell growth, development, differentiation, oncogenic transformation and apoptosis. In silico studies should be done to find out the novel target genes for this TF. Even though a few bioinformatics tools are available for this purpose, the user needs to go back and . . .forth between different tools, and to repeat these steps for each of their candidate gene. Here we combined these tools and constituted a new tool which examines the affinity of any TF towards the selected target genes' promoter sequences. The tool is tested on several genes, which are predicted to be regulated by Pea3 TF. © 2011 IEEE Daha fazlası Daha az

Kopuklu, I. | Ertas, G.

Conference Object | 2013 | ELECO 2013 - 8th International Conference on Electrical and Electronics Engineering , pp.411 - 413

Environmental temperature and humidity levels have impacts on organisms and therefore care is taken to measure/monitor and maintain them at certain levels in daily life. In this study, a portable multichannel temperature and humidity monitoring device has been developed. The device houses multiple temperature sensors, a humidity sensor, a microcontroller, a display and a +9V battery. Tests with three temperature sensors show that the device is user-friendly and performs consistent measurements. The device is able to operate thirty-six sensors at maximum and can transfer measurement results to any personal computer or Bluetooth devic . . .e with universal asynchronous receiver input. © 2013 The Chamber of Turkish Electrical Engineers-Bursa Daha fazlası Daha az

Oguz, P. | Ertas, G.

Conference Object | 2013 | 2013 International Conference on Electronics, Computer and Computation, ICECCO 2013 , pp.56 - 59

Human body temperature is influenced by many factors such as cognitive, emotional and psychological states. Temperature measurements can be done using analogue or digital electrical sensors. High sensitivity and high accuracy in measurements are usually provided by the analogue sensors that require sophisticated circuits for linearization/calibration and also for digitization. When compared with the analogue ones, digital sensors can also provide high sensitivity but lower accuracy although good enough for several medical applications. In this study, a portable device with wireless computer connectivity that provides noninvasive dua . . .l channel digital body temperature measurements has been developed. Trials with the device show that it is quite beneficial in measuring body temperature from ear canal. It may also be used to perform temperature measurements from mouth, armpit and anus. © 2013 IEEE Daha fazlası Daha az

Karaböce, B. | Gülmez, Y. | Bilgiç, E. | Sadikoglu, E. | Ince, A.T. | Skarlatos, Y.

Conference Object | 2014 | IEEE MeMeA 2014 - IEEE International Symposium on Medical Measurements and Applications, Proceedings , pp.56 - 59

HIFU (High Intensity Focused Ultrasound) transducers are attractive tools for cancer therapy. They must be used carefully for operator and patient safety as they produce very high powers up to a few hundred watts, and characterized in many ways. The ultrasonic power of a transducer is directly proportional to the applied input electrical voltage, current and consequently electrical power. Internationally accepted methods for measurements of ultrasonic output power up to 10 W are well established in the IEC 61161 standards [1]. The same method was used for higher powers up to 150 W with an uncertainty of 4.7% for 1.1 MHz and 5.0% for . . . 3.3 MHz in an intercomparison between national metrology institutes [8]. In this paper, input electrical power of the HIFU transducer, which is mainly converted into ultrasonic energy, was determined. 3 methods for the measurement of electrical power delivered to a reactive ultrasonic (HIFU) transducer were compared. Electrical power measurements were realized with an expanded uncertainty of 3.3 % for up to 50 W and 4.3 % for up to 100 W in the frequency range between 0.93 MHz and 3.1 MHz. Measurement devices were calibrated and verified by establishing traceability to electrical and ultrasonic standards at TÜBITAK UME (The Scientific and Technological Research Council of Turkey, National Metrology Institute) primary laboratories. Electrical power measurement results obtained by this method were also compared with two different conventional power meters. Electrical power measurement results detailed in this paper showed an agreement with each other and conventional power meters. © 2014 IEEE Daha fazlası Daha az

Ozcan, E. | Mohan, C.K.

Conference Object | 1999 | Proceedings of the 1999 Congress on Evolutionary Computation, CEC 19993 , pp.1939 - 1944

A new optimization method has been proposed by J. Kennedy and R.C. Eberhart (1997; 1995), called Particle Swarm Optimization (PSO). This approach combines social psychology principles and evolutionary computation. It has been applied successfully to nonlinear function optimization and neural network training. Preliminary formal analyses showed that a particle in a simple one-dimensional PSO system follows a path defined by a sinusoidal wave, randomly deciding on both its amplitude and frequency (Y. Shi and R. Eberhart, 1998). The paper takes the next step, generalizing to obtain closed form equations for trajectories of particles in . . . a multi-dimensional search space. © 1999 IEEE Daha fazlası Daha az

Alkan, A. | Ozcan, E.

Conference Object | 2003 | 2003 Congress on Evolutionary Computation, CEC 2003 - Proceedings3 , pp.1796 - 1802

Course timetabling problems are real world constraint optimization problems that are often coped with educational institutions, such as universities or high schools. In this paper, we present a variety of new operators that can be also applied in evolutionary algorithms for other timetabling problems, such as, exam timetabling. Operators include violation directed mutations, crossovers, and a successful violation directed hierarchical hill climbing method. Tests are performed on a small portion of a real data and results are promising. © 2003 IEEE.

Keskin, A.Ü. | Koyuncu, C.

Conference Object | 2010 | 2010 15th National Biomedical Engineering Meeting, BIYOMUT2010 , pp.1796 - 1802

A simple liquid sensing and measurement system for determining the level of cryogen in a tissue cryopreservation container is described. Liquid-gas boundary determination is made by detecting a thermal transient of the series-connected light emitting diodes. An electronic control and display unit located on the outer wall of the container indicates the level of cryogenic liquid, and alarms the operator if it reaches a pre-determined critical level. ©2010 IEEE.

Buyukkayhan, A.S. | Kavak, A. | Yaprak, E.

Conference Object | 2013 | 2013 International Conference on Electronics, Computer and Computation, ICECCO 2013 , pp.76 - 79

In this paper, we determine the statistical properties of the Real Time Protocol (RTP) flows and enhance the Statistical Protocol Identification (SPID) application to differentiate voice and data traffic. We added 3 new attribute meters and generate a model database for the Session Initiation Protocol (SIP) and RTP protocols. The preliminary results with very low number of training capture seem promising. The results show that our new attributes improve the RTP flow identification recall by 15%. © 2013 IEEE.

Onaran, E.M. | Ertas, G. | Kucuk, H.

Conference Object | 2013 | ELECO 2013 - 8th International Conference on Electrical and Electronics Engineering , pp.414 - 417

In rehabilitation of walking difficulties, it is vital to be aware of the distribution of the force and moment pairs faced by the lower limb extremities. The mathematical equations for numerical computation of these pairs are provided by free body diagrams that require some foot force measurements and joint/segment-tilt angle measurements as well. In this study, a device has been developed to capture the foot force and the ankle, knee and hip joint angles. The device is equipped with three accelerometers and six force sensitive resistors. The measured forces and angles are computed and next transferred to personal computer. The devi . . .ce is calibrated and then tested on a healthy volunteer. The test results show that the device may be used to provide valuable measurements to compute force distributions in lower extremity. © 2013 The Chamber of Turkish Electrical Engineers-Bursa Daha fazlası Daha az