Sürdürülebilir Kalkınma Amaçları

• 1

• BildiriAçık Erişim2017/r/bayburt/12299
  Relations of attention and meditation level with learning in engineering education

  Ülker, Büsra; Tabakcioǧlu, Mehmet Bariş; Çizmeci, Hüseyin; Ayberkin, Doruk

  Neurons use electricity in order to communicate to each other. Due to numerous signals sent by neurons, there are oodles of electrical activity in the brain. Sensitive equipment like electroencephalogram (EEG) biosensor perceives the brainwaves emanated from neurons. Beta waves are responsible for problem solving or decision making and associated with attention. Alpha waves are associated with now and meditation. Neurosky EEG biosensor perceives the brainwaves and transforms these brainwaves into attention and meditation values. In this study, Neurosky EEG biosensor is used for measuring the attention and meditation levels of students. A program is developed in C# medium. The developed program records raw brainwave data, attention and meditation average while the students are studying. As the attention and meditation levels are high, the students learn the subjects in the course. If predetermined meditation and attention level are not caught, the developed program does not give permission to pass to another subject. Because of that the students have less meditation and attention average than the predetermined value; they get fewer grades in the exam.

  • 
  AtıfScopus16·OpenAlex16

  İncele
• BildiriÖn baskısı açık2016/r/bayburt/14497
  Medium Access Control Protocols for Wireless Sensor Networks with Ambient Energy

  Kosunalp, Selahattin; Tabakcioglu, Mehmet Baris

  Wireless sensor networks (WSNs) have recently been a popular research area with a broad range of applications. One of the most significant constraints of WSNs is energy limitation of sensor nodes. Therefore, energy-efficiency has been considered as primarily design criterion in many medium access control (MAC) protocols developed. In order to solve the issue of limited-energy sources, various recent protocols have focused on energy harvesting from surrounding environment, such as solar, wind and vibration energy, resulting in providing unlimited energy source. Ambient energy exhibits a characteristic of unlimited energy source but not available always due to environmental changes. The focus is now being placed on effective utilization of the time-varying ambient energy. This study aims to provide a review of recently proposed MAC protocols for energy-harvesting WSNs describing their operating principles and underlying features.

  İncele
• MakaleYalnız künye2015/r/bayburt/15499
  Işın İzleme Tekniğinin Radyo Dalga Yayılım Modellerinde Kullanılması

  Tabakcıoğlu, Mehmet Barış; Ayberkin, Doruk

  Daha güvenilir, zaman açısından verimli ve kesinliği yüksek elektromanyetik dalga  şiddeti kestirimi yapmak için birçok yayılım modeli geliştirilmiştir. Bu modeller nümerik ve ışın izleme tekniği tabanlı olmak üzere iki kısımdır. Nümerik modellerin hesaplama zamanı ve kesinliği yüksektir. Buna karşın ışın izleme tekniği tabanlı modellerin hesaplama süresi daha kısadır. Vericiden çıkan ve alıcıda sonlanan tüm ışınların tespit edilmesi alıcı üzerindeki bağıl yol kaybının doğru hesaplanması için çok önemlidir. Bu çalışmada kısaca bazı yayılım modelleri hakkında bilgi verildikten sonra ışın izleme tekniği yazılımı açıklanacaktır ve karşılaştırmalar yapılacaktır.  

  İncele
• BildiriÖn baskısı açık2015/r/bayburt/14483
  Application of of Ray Tracing Technique into S-UTD-CH Model

  Tabakcioglu, Mehmet Baris; Ayberkin, Doruk

  To make higher accuracy predictions having less computation complexity, lower computation time, a lot of electromagnetic wave propagation models are developed. These models are classified into two classes, ray tracing based and numerical models. Computation complexity, computation time and accuracy of prediction of numerical model are high. On the contrary, computation complexity and computation time of ray tracing based model is lower. There is a tradeoff between computation time and accuracy. To predict the relative path loss at the receiver accurately, all ray paths have to be determined. In this study, after giving some brief information about some ray tracing based propagation models ray tracing software will be explained.

  AtıfWoS1

  İncele
• BildiriÖn baskısı açık2015/r/bayburt/14387
  Building Parameter Analysis with S-UTD-CH model in Multiple Diffraction

  Tabakcioglu, Mehmet Baris; Ayberkin, Doruk

  Electromagnetic wave propagation models are used in radio planning tool and coverage prediction. These models are based on ray tracing technique or numerical. Slope UTD with convex hull model is a model which has less computation time, higher accuracy of prediction and based on ray tracing technique. S-UTD-CH model is used in multiple diffraction due to that this model gives more accurate results in less computation time. Obstacles can be modelled as knife edge, wedge or cylinder in ultra-high frequencies. inner angle, structure type and relative permittivity constant and conductivity of obstacle and polarization type of electromagnetic wave change the relative path loss at the receiver. In the study, how building parameter changes the relative path loss is discussed.

  İncele
• MakaleYalnız künye2014/r/bayburt/15535
  Çoklu kırınımlar içeren senaryolar için elektromanyetik dalga yayılım modelleri

  Tabakcıoğlu, Mehmet Barış; Cansiz, Ahmet

  Dijital yayın sistemlerinde daha güvenilir yayın yapmak için kapsama alanı ve alıcı üzerindeki alan şiddetinin kestiriminde yayılım modelleri kullanılmaktadır. Yayılım modelleri temelde nümerik ve ışın izleme tekniğine dayanan modeller olmak üzere iki ana grupta incelenebilir. Elektromanyetik dalga yayılım modellerinde hesaplama zamanı ve kestirilen alan şiddetinin kesinliği arasında bir ödünleşme vardır. Nümerik modeller kesin sonuçlar vermesine karşın, hesaplama zamanı yüksektir, ışın izleme tekniğine dayanan modeller ise kesinliği az olmakla beraber hesaplama zamanı düşüktür. Hesaplama zamanı ve kesinlik açısından optimum olan modellere ihtiyaç duyulmuştur. Bunun için birçok model geliştirilmiştir.

  AtıfTR Dizin2

  İncele
• BildiriYalnız künye2014/r/bayburt/13940
  Application of S-UTD-CH model into multiple diffraction scenarios at 900MHz

  Tabakcioglu, Mehmet Baris; Ayberkin, Doruk

  In this study, propagation prediction models based on ray tracing in coverage estimation for broadcasting systems are compared with respect to computation time and accuracy. Uniform Theory of Diffraction (UTD), Slope Diffraction (S-UTD) and Slope UTD with Convex Hull (S-UTD-CH) models are compared for computation time and propagation path loss. Moreover in this study, effects of transmitter height to relative path loss at the receiver are analyzed. S-UTD-CH model is optimum model with respect to computation time and relative path loss.

  İncele
• MakaleYalnız künye2014Scopus SJRQ2/r/bayburt/13644
  Comparison and analyzing of propagation models with respect to material, environmental and wave properties

  Tabakcioglu, M.B.; Ayberkin, D.; Cansiz, A.

  This paper presents a study on a class of algorithms based on Uniform Theory of Diffraction (UTD) for multiple diffractions. Within this context Slope UTD with Convex Hull (S-UTD-CH) model based on Slope UTD and Fresnel zone concept was reviewed. S-UTD-CH model can be used for fast and more accurate field prediction for multiple diffractions in transition zone. An extensive simulation results for comparison of UTD based algorithms with respect to the computation time and accuracy was provided. Furthermore, the study shows how relative permittivity constant, conductivity and inner angle of wedge and polarization type affect the relative path loss.

  AtıfScopus6

  İncele
• MakaleAçık Erişim2013Scopus SJRQ4/r/bayburt/13912
  Analysis of amplitude and slope diffraction coefficients

  Tabakcioglu, Mehmet Bariş; Cansiz, Ahmet

  The diffraction mechanism is used for field prediction in both light and shadowed regions. Slope and amplitude diffraction coefficients are vital to predict the field strength at the receiver accurately. In this paper, amplitude and slope diffraction coefficients for one of the ray theoretical models, the slope uniform theory of diffraction with convex hull (S-UTD-CH) model, are analyzed. Moreover, diffraction coefficients are given for knife-edge and wedge structures.

  İncele
• MakaleAçık Erişim2013Scopus SJRQ2/r/bayburt/13648
  Application of S-UTD-CH model into multiple diffraction scenarios

  Tabakcioglu, Mehmet Baris; Cansiz, Ahmet

  Propagation prediction models based on ray tracing in coverage estimation for digital broadcasting systems are compared. Geometrical Theory of Diffraction (GTD), Slope Uniform Theory of Diffraction (S-UTD), and Slope UTD with Convex Hull (S-UTD-CH) models are compared for computation time and propagation path loss. S-UTD-CH model is optimum model with respect to computation time and relative path loss.

  AtıfScopus8·WoS7·OpenAlex11

  İncele