Bursa, Turkey

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

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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.

Eskidere O.,Bursa Orhangazi University
International Journal on Artificial Intelligence Tools | Year: 2016

Identification of the speech signal origin is an important issue since it may play a vital role for criminal and forensic investigations. Yet, in the media forensics field, source digital voice recorder (DVR) identification has not been given much attention. In this paper we study the effect of subband based features obtained using uniform wavelet packet decomposition and Teager energy operator on the DVR model and brand identification performance. In order to assess the effects of these features on the proposed system, one-class classifiers (OCCs) with two reference multi-class classifiers were carried out. The performance of the DVR identification system is tested on a custom database of twelve portable DVRs of six different brands. The results showed that the proposed system can effectively identify the correct DVR brands/models with a high accuracy. Moreover, it was observed that the combination of the traditional speech features with subband Teager energy cepstral parameters (STEC) and short time frame energy as a feature improved recognition accuracy under both silent and noisy recording conditions. © 2016 World Scientific Publishing Company.

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.

Fettahoglu A.,Bursa Orhangazi University
Cogent Engineering | Year: 2016

Orthotropic decks are composed of deck plate, ribs, and cross-beams and are frequently used in industry to span long distances, due to their light structures and load carrying capacities. Trapezoidal ribs are broadly preferred as longitudinal stiffeners in design of orthotropic decks. They supply the required stiffness to the orthotropic deck in traffic direction. Trapezoidal ribs are chosen in industrial applications because of their high torsional and buckling rigidity, less material and welding needs. Rib width, height, spacing, thickness of deck plate are important parameters for designing of orthotropic decks. In the scope of this study, rib width to height and rib spacing to deck plate thickness ratios are assessed by means of the stresses developed under different ratios of these parameters. For this purpose a FE-model of orthotropic bridge is generated, which encompasses the entire bridge geometry and conforms to recommendations given in Eurocode 3 Part 2. Afterwards necessary FEanalyses are performed to reveal the stresses developed under different rib width to height and rib spacing to deck plate thickness ratios. Based on the results obtained in this study, recommendations regarding these ratios are provided for orthotropic steel decks occupying trapezoidal ribs. © 2016 The Author(s).

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.

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

Erbil Y.,Bursa Orhangazi University | Durak S.,Uludag University
Environmental Engineering and Management Journal | Year: 2012

In Turkey, most of the building stock is composed of reinforced concrete buildings. As a developing country located in seismic zone, Turkey faces the risk of casualties and property loss depending on poor quality of material, poor labour and lack of building control mechanism in existing buildings. Therefore, especially after August 17, 1999 earthquake, the need for investigation of earthquake resistance of existing reinforced concrete building stock that are vulnerable to earthquake and identification of buildings with high earthquake risk had been emerged. The objective of this paper is to introduce a tool to prepare a database for assessment of seismic vulnerability of existing building stock in seismic risk regions. The tool consists of general building properties, damages resulting from building deficiencies and decision on strengthening studies. The use of building database form provided in this study has been illustrated by five sample buildings in Golcuk/Turkey. This tool can be used to monitor and strengthening studies and to prepare a database earthquake occurs in seismic risk regions. This study provides a practical contribution to the studies in urban scale in order to increase earthquake resistance of reinforced concrete buildings.

Ali B.S.M.,Bursa Orhangazi University
High Temperature Materials and Processes | Year: 2016

Two novel small specimen creep testing techniques are presented in this paper. The pin-loaded small one-bar specimen (OBS) and the small notched specimen with four loading pins (SNS4) are designed to determine the remaining lifetime for the high-temperature components. The small OBS is suitable for use in obtaining both uniaxial creep strain and creep rupture life data and the SNS4 is designed to obtain the multiaxial behaviour using small material samples. The specimens can be made from small material samples removed from the component surface or from the heat-affected zone. The specimens can be loaded through pin connections for testing. A conversion relationship and conversion factor have been obtained and used to convert the OBS creep data to the corresponding uniaxial data. For validation two materials have been used, P92 and P91 steels at 650°C. The advantages of these testing techniques are highlighted; the recommendations for future research are also given. © 2016 by De Gruyter.

The performance implications of link or node failures in Mobile Ad-hoc Network (MANET) networks are studied in details.Several recovery mechanisms are proposed to reduce the impact of failure and guarantee a loop-free in the network. These mechanisms seek to reduce recovery time, which remains undesirably long in the current routing protocols in wired and wireless networks. Hence, we evaluate the efficiency of the Optimized Link State Routing Protocol with and without recovery paths under varying environment with different node densities. In addition, the mobility of nodes is changing the speed movements when they start to move from area to another one. This paper assists in ascertaining the effect of varying node densities on the connectivity’s life between mobile nodes in the network. Hence, it showed the effect of a local recovery mechanism resulted in achieving a significant improvement in network performance by seeking a long life backup path between source and destination for different nodes density. Real time applications are required to be supported by mobile ad hoc networks by finding an efficient recovery mechanism. This is because the MANET networks allow the nodes to move from one area to another without any notification. The real time applications traffics are considered as a sensitive application, and it is the most affected by failure through the occurrence of delay and loss of packets. It is, therefore, not suitable for use by players. In mobile ad hoc networks, routing protocol functions are based on many factors, such as, node mobility and density and broken paths. According to these factors, the paper was further extended to develop a recovery mechanism in MANET based on the mobility and density of nodes to alleviate the impact of the frequent loss of connection due to the flexibility of free nodes, which move from one area to another without pre-notification.The aim behind recovery mechanism is to reduce current recovery time to enhance the Quality of Service in the MANET. © 2015 Springer Science+Business Media New York

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