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Bursa Orhangazi University is a Private University in Bursa. Wikipedia.

Eskidere O.,Bursa Orhangazi University
Turkish Journal of Electrical Engineering and Computer Sciences | Year: 2016

Speech characteristics have played a critical role in media forensics, particularly in the investigation of evidence. This study proposes two wavelet-based feature extraction methods for the identification of acquisition devices from recorded speech. These methods are discrete wavelet-based coefficients (DWBCs) and wavelet packet-based coefficients, which are mainly based on a multiresolution analysis. These features' ability to capture characteristics of acquisition devices is compared to conventional mel frequency cepstral coefficients and subband-based coefficients. In the experiments, 14 different audio acquisition devices were trained and tested using support vector machines. Experimental results showed that DWBCs can effectively be used in source audio acquisition device identification problems. © TÜBİTAK.

Yuen Y.P.,Bursa Orhangazi University | Kuang J.S.,Hong Kong University of Science and Technology
Engineering Structures | Year: 2015

Due to the architectural efficiency of masonry-infilled reinforced concrete frames, the frames are highly common structural forms for buildings. However, the infills can significantly modify the structural behaviour of these frames, which can be detrimental to the seismic performance of buildings. This study investigates the seismic response and failure mechanisms of infilled RC-frame structures with five different infill configurations: (1) full infills, (2) 2/3-storey-height infills, (3) a soft first storey, (4) infills with window openings and (5) infills with door openings. The nonlinear response history behaviour of the masonry-infilled RC frames under four realistic earthquakes, namely, the 1979 El Centro, 1987 Superstition Hills, 1995 Kobe and 1999 Chi-Chi earthquakes, were simulated using discrete-finite element analysis with damage-based constitutive relations. The analysis indicated that the degrees of continuity and regularity of the infill panels crucially affect the seismic performance of structures. As long as out-of-plane collapse of infills does not occur, full-height and continuous-infill panels can enhance the overall stability and energy dissipation of frame structures. By contrast, discontinuous infills can inflict serious damage localised at the points of discontinuity in the frame members. Furthermore, the analysis revealed that the design concept of "strong column-weak beam" may not be always applicable to infilled frames. © 2015 Elsevier Ltd.

Yuen Y.P.,Bursa Orhangazi University | Kuang J.S.,Hong Kong University of Science and Technology
Proceedings of the Institution of Civil Engineers: Structures and Buildings | Year: 2015

Reinforced concrete (RC) structural walls can render excellent lateral stability and ductility to medium to high-rise buildings, but are generally subjected to very high axial compression loading, which can reduce the inherent ductility. A comprehensive statistical analysis with 474 sets of experimental data was conducted to evaluate and quantify the effect of the axial compression ratio (ACR) on the structural performance of RC structural walls. The stipulated limits on the ACR and the methods of evaluation used in various design codes were compared. Provisions on the limits of the ACR stipulated in various design codes were compared, and the expected attainable ductility factors for RC walls designed to different codes were evaluated. It was found that the provisions on ACR limits in Eurocode 8 generally satisfy the target ductility level but a distinction needs to be made between non-squat and squat walls due to their different structural behaviours. © 2015, Thomas Telford Services Ltd.

This article offers an analysis of the cooperation between the European Union (EU) and the United States on customs security in the context of the two actors' fight against terrorism. While other aspects of EU–U.S. counterterrorism cooperation have received some scholarly attention, not so much research has focused on security cooperation in the EU–U.S. customs and supply chain. To investigate the emergence of transatlantic cooperation in this field this article employs regime theory in examining the 2004 EU–U.S. customs security agreement, the 2012 EU–U.S. mutual recognition decision, and the transatlantic disagreement on the U.S. 100 percent scanning rule. © 2015 Taylor & Francis Group, LLC

Eskidere O.,Bursa Orhangazi University
Turkish Journal of Electrical Engineering and Computer Sciences | Year: 2014

Microphone identification is a specific type of media forensics that investigates whether it is possible to identify the source microphone from speech recordings. The main aim of this study is to find out which of the several feature extraction techniques are best suited to the source microphone identification systems. We perform microphone identification experiments with 16 different microphones using 3 datasets. In order to improve the results on the datasets, we also investigate the important parameters that may affect the microphone identification performance. Our experimental results show that the proposed method is comparable to the existing studies in a closed-set identification rate. © TUBITAK.

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