Browsing by Author "Ercan, Ali Özer"
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Fault masking as a service
Gülcü, Koray (2013-01)In service-oriented architectures, composite services depend on a set of partner services to perform their tasks. These partner services may become unavailable due to system and/or network faults, leading to an increased ... -
Fusing inertial sensor data in an extended kalman filter for 3D camera tracking
Erdem, Tanju; Ercan, Ali Özer (IEEE, 2015-02)In a setup where camera measurements are used to estimate 3D egomotion in an extended Kalman filter (EKF) framework, it is well-known that inertial sensors (i.e., accelerometers and gyroscopes) are especially useful when ... -
Girişim bulunan IEEE 802.11ac aǧlarda TCP sıkışıklık denetim algoritmalarinin başarımları
Çakmak, Kıvanç; Sunay, Mehmet Oğuz; Ercan, Ali Özer; Karaca, M. (IEEE, 2016)In order to meet the incremental requirements from clients, fifth generation Wireless Local Area Network(WLAN) protocol IEEE 802.11ac provides a lot more throughput than his predecessors. However, in all distributed channel ... -
Görünüş temelli̇ örtüşme gözeten 3D nesne taki̇bi̇
Topçu, O.; Ercan, Ali Özer; Alatan, A. (IEEE, 2012)Object tracking is an important element of computer vision algorithms. This problem is difficult due to occlusion, illumination changes and shadows. We propose an appearance based occlusion-aware method for object tracking. ... -
IEEE 802.11ac aǧların çok kullanıcılı ÇGÇÇ özelliǧi üzerine incelemeler
Çakmak, Kıvanç; Sunay, Mehmet Oğuz; Ercan, Ali Özer (IEEE, 2016)This paper studies the multi-user MIMO feature of IEEE 802.11ac networks that serve, along with IEEE 802.11ac nodes, also legacy IEEE 802.11n nodes. For this purpose, we develop a simulator that models the IEEE 802.11ac ... -
Improving models for model-based testing based on exploratory testing
Gebizli, Ceren Şahin (2014-08)Model bazlı test, test edilen sistemin modelleri sayesinde otomatik olarak test senaryoları oluşturulmasını sağlar. Bu modellerin doğruluğu ve tamlığı oluşturulan test senaryolarının etkinliğini belirler. Genelde manuel ... -
Information theoretical performance analysis and optimization of underwater acoustic communication systems
Nouri, Hatef (2013-08)Underwater wireless communication is a rapidly growing field of research and engineering as its applications, which were once exclusively military, are extending into commercial fields. The need for underwater wireless ... -
Joint frequency allocation and power control for minimum downlink interference in femtocellular networks
Ferazoğlu, Gülden (2013-01)Due to the fact that the most of data services and more than half of calls are requested indoors, it has been dramatically important and even a must for cellular operators to provide more than adequate indoor coverage. ... -
Kamera ve ataletsel ölçüm birimi iç kalibrasyonu
Erdem, Tanju; Ercan, Ali Özer; Aydın, T. (IEEE, 2013)In this paper, we address the problem of internal calibration of a camera and an inertial measurement unit (IMU). The internal calibration of a camera and an IMU requires the determination of the relative orientation and ... -
Modeling of RF energy harvesting and energy consumption system for low power wireless sensor networks
Amjad, Osama (2017-01)Recently, with the advancement of technology, there has been a rapid growth of low power wireless devices, such as wireless sensor networks (WSNs) and Internet of Things (IoT). Therefore, the energy requirement for perpetual ... -
A multi-sensor integrated head-mounted display setup for augmented reality applications
Kermen, Ahmet; Aydın, T.; Ercan, Ali Özer; Erdem, Tanju (IEEE, 2015)We present an HMD based AR system comprising visual and inertial sensors. The visual sensor is a camera pair and the inertial sensors consist of an accelerometer and a gyroscope. We discuss the temporal and spatial calibration ... -
Multi-view structure from motion software platform for augmented reality applications
Hüroğlu, Cengiz (2014-05)Sensör, bilgisayar ve görselleme teknolojilerindeki hızlı gelişme, hareketten yapı çıkarımı tekniklerinin navigasyon, insan-bilgisayar etkileşimi, eğitim, eğlence ve eklenmiş gerçeklik gibi uygulamalarda kullanımı nı ... -
Multiple-description coded streaming video multicast over software-defined networs
Noghani, Kyoomars Alızadeh (2014-08)Video has become one of the most prominent applications of the Internet. Many of the video streaming applications involve the distribution of content from a CDN source to a large population of interested clients. However, ... -
Multivariate sensor data analysis for oil refineries and multi-mode identification of system behavior in real-time
Khodabakhsh, Athar; Arı, İsmail; Bakır, M.; Ercan, Ali Özer (IEEE, 2018)Large-scale oil refineries are equipped with mission-critical heavy machinery (boilers, engines, turbines, and so on) and are continuously monitored by thousands of sensors for process efficiency, environmental safety, and ... -
Object tracking in the presence of occlusions using multiple cameras: a sensor network approach
Ercan, Ali Özer; El Gamal, A.; Guibas, L. J. ( Association for Computing Machinery, 2013)This article describes a sensor network approach to tracking a single object in the presence of static and moving occluders using a network of cameras. To conserve communication bandwidth and energy, we combine a task-driven ... -
Occlusion-aware 3D multiple object tracker with two cameras for visual surveillance
Topçu, O.; Alatan, A. A.; Ercan, Ali Özer (IEEE, 2014)An occlusion-aware multiple deformable object tracker for visual surveillance from two cameras is presented. Each object is tracked by a separate particle filter tracker, which is initiated upon detection of a new person ... -
On sensor fusion for head tracking in augmented reality applications
Ercan, Ali Özer; Erdem, Tanju (IEEE, 2011)The paper presents a simple setup consisting of a camera and an accelerometer located on a head mounted display, and investigates the performance of head tracking for augmented reality applications using this setup. The ... -
On the feasibility of synchronous, retransmission-based cognitive networks
Ercan, Ali Özer; Sunay, Mehmet Oğuz (Elsevier, 2016-01)This paper presents a new, joint Markov chain model for the primary and secondary traffic in a cognitive radio network to assess the feasibility of opportunistic spectrum access for different operational scenarios, validated ... -
Optimization and analysis of WLAN RF energy harvesting system architecture
Munir, Syeda Wajiha; Amjad, Osama; Zeydan, E.; Ercan, Ali Özer (IEEE, 2016)This paper presents the design, analysis and optimization of RF energy harvesting system for WLAN source operating at 2.4 GHz and 5.8 GHz. The system architecture comprises of RF WLAN source, wireless channel, an efficient ... -
Optimization and analysis of WLAN RF energy harvesting system architecture for low power wireless applications
Munır, Syeda Wajıha (2017-01)The presented work proposes a radio frequency (RF) energy harvesting circuit design, which scavenges energy from WLAN dual frequency band. In comparison to other available sources for energy scavenging, e.g. solar, wind ...
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