Yazarlar
Yayınlar
- BildiriAçık Erişim2022Implementation of a SoC by Using lowRISC Architecture on an FPGA for Image Filtering Applications
Akçay, Latif; Sürer, Bartu; Yalçin, Berna Ors
In this study, it is aimed to implement the lowRISC system-on-chip, which is based on the Rocket processor created with the RISC-V instruction set architecture developed by Berkeley University, on FPGA and to run image processing algorithms on this system. While making this implementation, the main target is a system that is very simple, consumes low power, and can be quickly redirected to other purposes. Therefore, it is based on the effective evaluation of the existing system without using any extra customized accelerators. Thus, a free, open source, and powerful enough platform for many embedded system applications is proposed to the designers. For this purpose, a lane detection application designed with standard C libraries such as Gaussian blur filter, Sobel operation filter and other elements, which are widely used in image processing applications, is run with embedded Linux operating system and the results are shared.
AtıfOpenAlex1
İncele - BildiriYalnız künye2017Harvesting Solar Energy for Limited-Energy Problem in Wireless Sensor Networks
Kosunalp, Selahattin; Cihan, Ahmet
The major problem in wireless sensor networks (WSNs) is the limited-energy source, typically small batteries, employed by sensors. In order to prolong the lifetime of the WSNs, a lot of approaches have taken the limited-energy problem as a primarily design criterion. However, inevitable energy depletion will eventually disturb the operation of the WSNs. Recent studies have shown that renewable energy sources would potentially provide an infinite energy source for powering WSNs. Solar energy is the most effective energy source for WSNs as it has the largest power intensity. Therefore, each sensor which requires a small amount of energy for efficient operation can harvest sufficient energy from solar. In this study, a platform is designed in order to allow sensors to exploit solar energy. The performance of the sensors in terms of the lifetime is practically studied. The results demonstrate that sensors can also survive when there is no energy available through storing energy in a super-capacitor. IRIS nodes are used in experiments as they are very popular in WSNs domain.
- BildiriÖn baskısı açık2016Medium 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.
- BildiriÖn baskısı açık2015Application 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.
AtıfWoS1İncele - BildiriÖn baskısı açık2015Building 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.
- BildiriYalnız künye2015DIRECT AND FAST GROWTH OF A SI:GAAS THIN FILM BY MEANS OF THERMIONIC VACUUM ARC (TVA)
Senay, Volkan; Özen, Soner; Pat, Suat; Korkmaz, Sadan
AtıfWoS2İncele - BildiriYalnız künye2015MO DOPED GAN THIN FILM GROWTH USING THERMIONIC VACUUM ARC (TVA)
Özen, Soner; Pat, Suat; Korkmaz, Sadan; Senay, Volkan
AtıfWoS1İncele - BildiriYalnız künye2015SOLID STATE BATTERY MANUFACTURING WITH THERMIONIC VACUUM ARC AND RF SPUTTERING
Pat, Suat; Özen, Soner; Senay, Volkan; Korkmaz, Sadan; Pat, Zerrin
AtıfWoS1İncele - Dergi2022 30TH SIGNAL PROCESSING AND COMMUNICATIONS APPLICATIONS CONFERENCE, SIU