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20124
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Publisher: Turgut Ozal Univ

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Now showing 1 - 4 of 4
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    Survey on the Usage of Digital Certificates in Ssl-Based Web Services
    (Turgut Ozal Univ, 2012) Yumsak, Ozkan; Bostan, Atila; Sekerci, Abdullah Sinan; Anameric, Munir
    Security of the communication on secure web services is provided with SSL (Secure Socket Layer) technology. SSL technology makes use of digital certificates and misuse of these digital certificates may cause security exploits. In this study, misuse ratio of certificates in university websites on the Internet is found out. To obtain this information, certificates which are used in the SSL web services are scanned. The conclusion of this study points out valid and invalid ratios of digital certificate usage in Internet based SSL web services.
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    Citation - WoS: 3
    Rectangular Shaped, Dual-Frequency Antenna With a Single Shorting Pin
    (Turgut Ozal Univ, 2012) Kapusuz, K. Yavuz; Can, Sultan; Aydin, Elif
    In this study, a dual-frequency rectangular patch antenna is demonstrated. The dual frequency operation is obtained via inserting a shorting pin to the rectangular patch coaxial fed antenna. The first and the second resonant frequencies are presented for different substrate, thickness, and side length values. The effect of the shorting pin is also observed and the results are presented. The results obtained from this study are compared with the ones in the literature and satisfactory agreement is obtained. While 4.75% average error is achieved for the first resonant frequency, the average error for the second resonant frequency is 4.49%. The relation of the first and the second resonant frequency with the antenna parameters are evaluated and presented.
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    Signal and System Level Simulations for Wideband Intercept Receivers: Eliminating Spur Signals
    (Turgut Ozal Univ, 2012) Karadede, Ilter; Kara, Ali
    This paper presents signal and system level simulation results on some wideband intercept receiver structures. For this purpose, first various wideband receiver structures are compared briefly, and an emitter signal generator is designed using a commercial simulation package. Then, channelized wideband receiver design methodology is discussed and implemented in the simulator. Finally, two design approaches chosen for channelization process are employed, and simulation results are discussed for eliminating spur signals.
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    A Comparison of Wavelet Family of Transforms from Image Forensics Perspective
    (Turgut Ozal Univ, 2012) Ozparlak, Levent; Avcibas, Ismail
    In this study, we compare wavelet based transforms for the cases of different image forensics problems. We extract wavelet based features and make experiments for different problems. The results show that a mixture of wavelet based features give the best performance in each experiment. In the absence of such a classifier with mixed features, the best performing features were obtained from contourlet transform coefficients.