Fettahoglu A.,Bursa Orhangazi University |
Sel I.,Bursa Orhangazi University
Journal of Materials in Civil Engineering | Year: 2017
An indirect tensile test (IDT) is used to obtain material parameters of wearing surfaces such as used pavements of ordinary roads or bridges. In the general (classical) approach, tensile and compressive displacements in orthogonal directions of any test specimen are assumed to have similar creep compliances to simplify the calculations. Consequently, the Poisson's ratio is obtained from the equation as a function of time. On the other hand, Poisson's ratio estimated via the IDT test using this assumption is actually found not to be varying with time. In other words, it is independent of time. Thus, the classical approach assuming equal creep compliances under tensile and compressive stresses results in inaccurate Poisson's ratio estimation, which obliges change in the calculation method. This study proposes a new method that assumes two different creep compliances under tensile and compressive stresses. It also presents the variation of stiffness moduli depending on time and the ratio between tensile and compressive creep compliances. © 2016 American Society of Civil Engineers.
Gurhanli A.,Bursa Orhangazi University
Acta Physica Polonica A | Year: 2016
Computer architects are familiar with complex processor designs. A tiny performance improvement may need involvement of numerous experts and months of tedious work. But sometimes without adding lots of extra hardware or inventing complex hardware algorithms, it is still possible to accelerate a design substantially by doing minor alterations in the data path. This paper presents how an ARM compatible processor's clock rate became 1.285 times faster by changing IO pads, employing multiplexers, and improving the ALU design. The processor has been implemented in Verilog HDL and the performance improvements have been verified by simulation using the Design Compiler tool of Synopsys.
Kaya A.,Bursa Orhangazi University
Finite Fields and their Applications | Year: 2017
Recently, Karadeniz and Yildiz introduced an efficient method to search for self-dual codes. It is called lifting method and can be applied to some alphabets. In this work, by considering R2-lifts of binary self-dual codes of length 16 new extremal binary self-dual codes of lengths 64 are constructed as Gray images. More precisely, we construct 15 new codes of length 64. Moreover, 10 new codes of length 66 were obtained by applying a building-up construction to the binary codes. Codes with these weight enumerators are constructed for the first time in the literature. The results are tabulated. © 2017 Elsevier Inc.
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).
Anagnostakis D.,Bursa Orhangazi University
Studies in Conflict and Terrorism | Year: 2015
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
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.
Abujassar R.S.,Bursa Orhangazi University
Wireless Networks | Year: 2015
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