Conference Presentations by Gürkan Çelik
2018 3rd International Conference on Computer Science and Engineering (UBMK), 2018
Localization has critical role for location-based services in wireless sensor networks (WSN). Var... more Localization has critical role for location-based services in wireless sensor networks (WSN). Various techniques have been proposed but accurate indoor localization is still an active research area. In this paper, we performed experimental studies on data collection and compared position prediction techniques for indoor environments. Findings of this study indicate that time of arrival based prediction gives better results than receiver signal strength indicator (RSSI) based prediction. Keywords-Internet of things, indoor positioning, indoor tracking, wireless sensor networks.
2017 IEEE 42nd Conference on Local Computer Networks Workshops (LCN Workshops), 2017
Recent advances in technology propelled the development of resource constrained tiny devices and ... more Recent advances in technology propelled the development of resource constrained tiny devices and the concept of Internet of Things (IoT). Potential applications spanning various fields of science from environmental to medical have been emerged. Different architectures, routing protocols, performance issues and goals have been suggested. In this work, we review fundamental concepts, recent developments and critical design factors under the IoT-specific objectives and constraints. Compared to other survey papers in the field, our objective is to provide a number of concepts also related to the energy efficiency and the effect of the environment of communications on the quality of signal. Index Terms-Internet of Things, path loss, heterogeneous networks, wireless sensor network, radio frequency identify, future networks.
2017 International Conference on Computer Science and Engineering (UBMK), 2017
Innovations in technology that have enabled efficient wireless tiny devices propelled the concept... more Innovations in technology that have enabled efficient wireless tiny devices propelled the concept of Internet of Things. It is expected that mobile data traffic will experience 8-fold growth between 2015 and 2020 and the number of mobile connected devices will reach 11.6 billion by 2020. Main factors of this exponential growth and wide acceptance are the integration of several technologies and communications solutions such as wired and wireless sensor and actuator networks, next generation communication protocols, identification technologies, and artificial intelligence for smart objects. In this work, we explore the role of the IoT in various fields, consider technological aspects, and examine the challenges and opportunities the IoT offers.
Books by Gürkan Çelik
Performability in Internet of Things, 2019
The IoT is a recent technology paradigm envisioned as a global network of sensors and devices cap... more The IoT is a recent technology paradigm envisioned as a global network of sensors and devices capable of interacting with each other. With the rapid advances in technology, IoT is providing great opportunities for novel applications that promise to improve the quality of our lives. Sensor networks are widely used in daily life in different areas such as smart cities, home and building automation, e-Health, security, localization, and many other areas [1]. With the development of IoT, LBS has gained significant attention and inventing efficient positioning mechanisms for sensor nodes has become an active research area. LBS can be used in a variety of contexts and may contain services to locate a person or object, such as the nearest supermarket or a child. Use of LBS is not only limited to consumer use but also provides new services for companies such as location-based advertising, employee management, and location-based games [2]. On the data transmission and networking side of IoT, for smart data transmission, it is necessary to choose the most appropriate communication technique by considering the position, battery status, and the signal strength of the nodes. By reducing energy consumption, the nodes and components of the network can operate for a longer period.
Thesis Chapters by Gürkan Çelik
Kocaeli University, 2015
An image mosaic is a panoramic image generated by assembling sequential images belong to the same... more An image mosaic is a panoramic image generated by assembling sequential images belong to the same scene. This method is mainly used in mapping applications, the evaluation of the images acquired from unmanned aerial vehicles (UAV), and various computer vision applications. In this study, a novel blending method is proposed for automatic and seamless mosaicing of photos taken by an unprofessional digital camera. For the correction of consistent seams occurred during the mosaicing, the color differences around the overlapping regions are tried to fix. For this purpose, instead of the new image frame is to be assigned are averaged with the previous images frame. The intensity values are averaged and finally, the average values of color differences are applied to overlapping regions. Besides, the code is performed for the corresponding boundary regions in order to reduce the seams. The results show the effectiveness, computational complexity and accuracy of the algorithm. Consequently, these implementations realizing an image mosaicing implementation, have been examined and verified with the experimental results. The results of study indicate that the seams, which occurs after mosaicing, can be substantially reduced or completely eliminated. Besides, it is observed that the illumination differences are minimized. The panoramic image is obtained by applying feature extraction, image matching, outlier point detection and removal, respectively homography estimation and image fusion on the images taken as input.
Akdeniz University, 2018
The increasing communication burden and energy consumption, changing security and user needs toge... more The increasing communication burden and energy consumption, changing security and user needs together with the developing technology require the transmission units to display intelligent behaviors while communicating with each other. To accomplish this, the network components for storing, processing and transmitting data; there is a need to evaluate the network situation and to organize the communication with each other well. For this purpose, optimized data distribution nodes are required within the networks that provide intelligent and low-cost data transmission, making their deployment efficient. In this study, recommendations for positioning methods in terms of interoperability, performance, resource management and innovative integrated platforms that can meet various user expectations and data distribution techniques were made. ZigBee based nodes for real environment testing were designed and produced. Results of measurements that check the energy status of the modules on the network in a smart data distribution system for the next generation internet and take into account their distance from each other. With the experiments; time of arrival (ToA) and the received signal strength indicator (RSSI) methods are compared. The findings indicate that in ToA based measurements are on average 1.13 times lower under outdoor conditions and 1.17 times higher under indoor conditions. RSSI based measurements on average 2.4 and under indoor conditions 2.6 times higher under outdoor conditions than the reference distance. The difference of the ToA values gives more accurate results for longer distances, so the estimates are closer to the expected value as the distance increases. Several filtering and statistical methods were used to reduce the error rate of these values.
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Conference Presentations by Gürkan Çelik
Books by Gürkan Çelik
Thesis Chapters by Gürkan Çelik