Ara
Toplam kayıt 161, listelenen: 101-110
A learning object harvesting model and a sample application
(Işık Üniversitesi, 2008-03-06)
The aim of this thesis is to enable harvesting of Learning Objects which are embedded in web pages. Two main challenges have been identified which are interoperability and semantics. For this purpose, several learning ...
Security of chaotic cryptosystems
(Işık Üniversitesi, 2008)
In this thesis, we tried to show the weaknesses of chaotic cryptosystems. We break four chaos-based cryptosystems and proved our attacks. In our first cryptanalysis, we broke a cryptosystem based on two dimensional chaotic ...
Semi-automatic customization for modeling human face
(Işık Üniversitesi, 2012-02-14)
Model-based vision has firmly established its roots as a robust approach in rec-ognizing and locating known traits in rigid objects even under the presence of noise, clutter and occlusion. However the application of such ...
Evolving strategies for web crawler
(Işık Üniversitesi, 2009-05-06)
With the rapid growth of Internet and Internet-based information, it becomes the largest and publicly accessible data source in the world. Every day millions of information available so to achieve information becomes harder. ...
Spline based neural networks
(Işık Üniversitesi, 2005-06)
In this thesis, we applied the Catmull-Rom splines and B-splines to the neural networks models, which are Multi Layer Perceptrons, Elman Networks, and Locally Recurrent Neural Networks, as adaptive activation functions. ...
Design and optimization of multiuser cooperative protocols for wireless networks
(Işık Üniversitesi, 2014-09-12)
Recently, the main trend in wireless communications has shifted from voice transmission to data communication. Naturally, this shift caused an increase in the data rate and bandwidth requirements. Being a limited and thus ...
Cooperative strategies, achievable rates and resource allocation for OFDMA channels
(Işık Üniversitesi, 2011-07-28)
The design of next generation wireless communication systems brings along new challenges, since the degrading factors such as fading and multi-user interference become harder to deal with as the number of users and the ...
Ring array processing for forward-looking intravascular and intracardiac ultrasonic imaging
(Işık Üniversitesi, 2010-06-08)
Forward-looking (FL) catheter-based imaging systems are highly desirable for guiding interventions in IVUS and ICE applications. One of the main challenges in the array based FLIVUS systems is the large channel count which ...
New approaches for channel estimation in wireless communications
(Işık Üniversitesi, 2006-03-10)
This thesis first proposes a conputationally efficient, pilot-aided linear minimum mean square error (MMSE) batch channel estimation algorthm for the orthogonal frequency division multiplexing OFDM systems in unkonown ...
Fingertip ECG signal based biometric recognition system
(Işık Üniversitesi, 2016-05-10)
The idea is the; realize biometric recognition system by using ECG signal which was began to use in the last 10 years. Until now, ECG based biometric systems have been developed by using the database which ECG signals are ...