Suhap Sahin

Suhap Sahin
Kocaeli University · Department of Computer Engineering

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59
Publications
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372
Citations

Publications

Publications (59)
Article
Due to their chaotic nature, underwater communication channels contain many adverse factors affecting the communication link quality and its performance. These adverse effects directly affect the data transfer between the source and the receiver. Absorption loss, which is one of these adverse factors, depends on depth, temperature, salinity, pH, an...
Article
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Melanoma is a malignant and aggressive type of skin cancer. This paper describes an effective method for detection of melanoma. A hybrid classification algorithm was developed by using the SVM algorithm and a heuristic optimization algorithm. In this algorithm, the SVM algorithm which uses a Gaussian Radial Basis Function (RBF) was enhanced by the...
Article
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Digital image capturing technologies and the internet are widely used today. These technologies make it very easy and fast to capture and share personal images in daily life. This causes difficulties in ensuring the confidentiality of private data and risks such as third persons getting hold of these data. The main goal of this study is to develop...
Article
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The main purpose of DNS is to convert domain names into IPs. Due to the inadequate precautions taken for the security of DNS, it is used for malicious communication or data leakage. Within the scope of this study, a real-time deep network-based system is proposed on live networks to prevent the common DNS tunneling threats over DNS. The decision-ma...
Article
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Image processing methods that take place in different areas of life from identification to traffic flow control are starting to be used on mobile devices. Hence, usage of optical mark recognition systems (OMRS) on mobile devices is also not widespread as it is for image processing applications. A mobile OMRS is developed using image processing meth...
Article
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There are no large-scale deployments to navigate the people indoor environments as the GPS for outdoor environments. Though, high accurate rate indoor localization has been considered the potential research areas by both academia and industry in last decade. These indoor localization research studies are divided into two groups in the literature wh...
Chapter
Research shows that in the last decade, the focus on computer-assisted diagnoses on the skin disorders has increased significantly as a result of the improvements in skin imaging technology and the development of compatible image processing techniques. More accurate treatments provided by means of computer-assisted diagnostic systems increase the p...
Article
Artificial Neural Network (ANN) training using gradient-based Levenberg & Marquardt (LM) algorithm has been implemented on FPGA for the solution of dynamic system identification problems within the scope of the study. In the implementation, IEEE 754 oating-point number format has been used because of the dynamism and sensitivity that it has provide...
Conference Paper
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Different methods are used to find the edges on the images. Canny edge detection algorithm is one of the most successful methods. Although it yields successful results, the processing load is very complicated. In this study, to enhance the Canny edge detection algorithm, enhancement was performed on the Canny edge detection algorithm using kernels...
Article
In this study, field-programmable gate array (FPGA)-based hardware implementation of the wavelet neural network (WNN) training using particle swarm optimization (PSO) and improved particle swarm optimization (iPSO) algorithms are presented. The WNN architecture and wavelet activation function approach that is proper for the hardware implementation...
Conference Paper
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Bilgi teknolojilerindeki gelişmeler eğitim alanında da etkisini göstermiş ve eğitim amaçlı mobil oyunların tasarlanması günümüzde gittikçe önem kazanmaya başlamıştır. Bu oyunlar tasarlanırken disiplinler arası etkileşimden yararlanma ise bir ihtiyaç haline gelmiştir. Bu çalışmada görüntü işleme yöntemlerine dayalı eğitim amaçlı bir mobil oyun tasar...
Article
Full-text available
Günümüzde akıllı telefonların kullanımının artması, herkesin bu cihazları rahatlıkla edinebileceği bir teknoloji haline getirmektedir. Bu artışa paralel olarak mobil cihazların kameraları kullanılarak geliştirilen uygulamalara gösterilen ilgi artmaktadır. Nesne tespiti gibi uygulamalarda, arka plan üzerinde ışık koşullarına bağlı olarak gölgeler me...
Article
Full-text available
Nowadays, image processing applications are frequently preferred in such fields as industrial automation, security, health, and traffic control in parallel with the developments in technology. The most important criterion for the applications used in these fields is to ensure the system to run at high speed and real time. Thus, FPGAs are commonly u...
Conference Paper
Full-text available
Designing block ciphers targeting resource constrained 8-bit CPUs is a challenging problem. There are many recent lightweight ciphers designed for better performance in hardware. On the other hand, most software efficient lightweight ciphers either lack a security proof or have a low security margin. To fill the gap, we present RoadRunneR which is...
Conference Paper
Full-text available
Localization methods enable estimating locations accurately and provide location information pertaining to mobile devices, people, cars, data and equipment. Accurate location detection is a vital process for most of location-based applications such as emergency rescue, in-building guidance, security services, and product tracking in hospitals. This...
Conference Paper
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Recently, with the increase in mobile and internet accessibility, it has become widespread that smart home systems can be managed remotely and monitored by mobile devices. In this study, a communication protocol between a mobil devices-embedded PC based control unit-sensors/actuators is designed and implemented. A handshaking mechanism between a mo...
Article
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Optical Mark Recognition (OMR) is a traditional data input technique and an important human computer interaction technique which is widely used in education testing. This paper proposes a new idea for grading multiple-choice test which is based on a camera on smartphone. The system key techniques and relevant implementations, which include the imag...
Conference Paper
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"Movement of Enhancing Opportunities and Improving Technology", abbreviated as Faith, is among the most important educational projects in Turkey, in which students and teachers can use their tablet PCs to obtain educational data (text, images, media, etc.) stored in cloud servers. However, given the large number of users along with vast amount of e...
Conference Paper
Full-text available
Kullanıcıların lokasyonularına bağlı kullanım yetkilerinin belirlenmesinin önem arz ettiği bazı dağıtık sistem uygulamalarında lokasyon tespitinin doğru yapılması hayati önem taşımaktadır. Bu doğrultuda, Fatih projesinde kullanıcıların lokasyonuna bağlı olarak farklı sunuculara yönlendirilmesi (bulut sunucu ya da okul sunucusu/yerel sunucu) sistem...
Conference Paper
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Veri kopyalanarak farklı amaçlar için coğrafi olarak dağıtık depolama birimlerinde tutulur. Aynı verilerin farklı lokasyonlarda tutulması beraberinde veri tutarsızlığı problemini getirmektedir. Bu problem farklı veri senkronizasyonu teknikleri ile giderilebilir. Veri senkronizasyonunu başlatmak için uygun zaman aralıklarının belirlenmesi ağ bant ge...
Conference Paper
Full-text available
'Movement of Enhancing Opportunities and Improving Technology', abbreviated as Fatih, is among the most important educational projects in Turkey, in which students and teachers can use their tablet PCs to obtain educational data (text, images, media, etc.) stored in cloud servers. However, the limited network bandwidth and increase in both the numb...
Conference Paper
Full-text available
In modern computer systems (communication systems, military systems, medical applications, etc.) are sophisticated mathematical operations and trigonometric calculations widely used. CORDIC (Coordinate Rotation DIgital Computer) architecture should be used on digital computers to implement complex mathematical operations and trigonometric calculati...
Conference Paper
Full-text available
It is preferable for wireless operators to use the existing infrastructure as possible for different services such as GSM, 3G and Wimax. This becomes possible with the development of software defined base stations. But, to obtain desired performance and flexibility in signal processing at software defined base stations needs to be implemented inste...
Conference Paper
It is preferable for wireless operators to use the existing infrastructure as possible for different services such as GSM, 3G and Wimax. This becomes possible with the development of software defined base stations. But, to obtain desired performance and flexibility in signal processing at software defined base stations needs to be implemented...
Article
Full-text available
In this paper, two-layered feed forward artificial neural network’s (ANN) training by back propagation and its implementation on FPGA (field programmable gate array) using floating point number format with different bit lengths are remarked based on EX-OR problem. In the study, being suitable with the parallel data-processing specification on ANN’s...
Article
Full-text available
For the integration of smart antennas into third generation code division multiple access (CDMA) base stations, it still remains as a challenging task to implement smart antenna algorithms on programmable processors. In this paper, we study implementations of some CDMA compatible beamforming algorithms, namely least mean square (LMS), constant modu...
Article
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Software radio implementations of beamformers on programmable processors such as digital signal processor (DSP) and field programmable gate array (FPGA) still remain as a challenge for the integration of smart antennas into existing wireless base stations for 3G systems. This study presents the comparison of DSP- and FPGA-based implementations of s...
Article
Full-text available
In this study, a new ANN training approximation on FPGA is presented using parallel processes according to the nature of ANN. Training is implemented on FPGA using particle swarm optimization (PSO) stochastic search algorithm which does not need any derivative information. All related parameter values and processes are defined with IEEE 754 floatin...
Article
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Bu çalışmada YSAnın doğasına uygun olarak paralel işlemlerle, FPGA üzerinde, YSA eğitimi için yeni bir yaklaşım sunulmuştur. Eğitim türev bilgisine ihtiyaç duymaksızın, rastgele arama algoritması olan parçacık sürü optimizasyonu (PSO) kullanılarak FPGA üzerinde gerçeklenmiştir. FPGA’de ilgili tüm parametre değerleri ve işlemler IEEE 754 kayan nokta...
Conference Paper
Full-text available
FFT/IFFT is the most important module for OFDM based baseband Wimax Modem architecture. However, computational complexity of this module is larger compared to other blocks in an OFDM system. It is critically important for the realization of this module on an FPGA that is much faster than traditional processors. In this paper, computation of CORDIC...
Conference Paper
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In this paper, it is shown that FFT algorithms using floating point numbers can be implemented on an FPGA. A custom VHDL library so called Fp_Lib is formed for general purpose computer arithmetic FPGA implementations. This library includes addition, subtraction, multiplication and division modules based on 32 bit single precision IEEE 754 format. T...
Conference Paper
Full-text available
This article explains implementing of fast Fourier (FFT) and inverse fast Fourier transform (IFFT) algorithms in FPGA. The reason of designing the study on FPGA base is that FPGAs are able to rearrange of logical blocks and moreover, mathematical algorithms can confirm faster by means of parallel data processing. For operating these algorithms, it...
Conference Paper
Full-text available
This paper presents implementation of some CDMA system compatible antenna array algorithms such as least mean square (LMS), constant modulus (CM) and space code correlator (SCC) on FPGA (such as Xilinx Virtex II Pro FPGA). Implementation issues such as architecture complexity and weight vector computation times are presented. For the signal modelin...
Chapter
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Floating point operations, which find their applications in vast areas such as many mathematical optimization methods, digital signal and image processing algorithms, and Artificial Neural Networks (ANNs), require much area and time for ordinary implementation on Field Programmable Gate Arrays (FPGAs). However, meaningful floating point arithmetic...
Conference Paper
Full-text available
This paper demonstrates implementation of some CDMA system compatible antenna array algorithms namely LMS and space code correlator (SCC) on an FPGA. A comparative study of FPGA and DSP implementation issues such as architecture complexity and weight vector computation time is also given. The implementations of the algorithms are performed on Xilin...
Conference Paper
Full-text available
The usage of the FPGA (Field Programmable Gate Array) for neural network implementation provides flexibility in programmable systems. For the neural network based instrument prototype in real time application, conventional specific VLSI neural chip design suffers the limitation in time and cost. With low precision artificial neural network design,...
Article
The FPGAs (Field Programmable Gate Arrays) approach for neural network implementation provides flexibility in programmable systems. For the neural based instrument prototype in real time application, conventional specific VLSI neural chip design suffers from the limitation in time and cost. With low precision artificial neural network design, FPGAs...

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