Sezgin Kaçar

Application of an on-line medical monitoring system

Wireless technologies which are the most important development areas in the twenty-first century and Wireless Body Sensor Networks which are developed for use in health care continues to be the focus on attention of researchers. Wireless Body Sensor Networks are used for monitoring health signals such as body temperature, heart pulse, EEG, and ECG of the people who are old, chronic illness or weak. In this paper, a health monitoring system is monitored via the Internet is presented. Implemented system consists of two parts: hardware and software. In the hardware part, body temperature and heart pulses of the patient are collected by the designed embedded system. And the system sends the data to health center over wireless sensor networks. And software part is a web based monitoring interface which accomplish to visualization and analysis of the collected data from the patient using MATLAB Builder NE and Web Figure.

Text encryption by using one-dimensional chaos generators and nonlinear equations

In this study, a chaos based encryption method with nonlinear equations in MATLAB environment is proposed to increase communication security. Encryption methods that generated by using the properties of three different chaos generators are analyzed. Logistic Map, Pinchers Map and Sine-Circle Map chaos generators which are commonly referred in the literature are used to realize applications. Performance is analyzed by using time and entropy values.

Design of a novel biomedical signal processing and analysis tool for functional neuroimaging

In this paper, a MATLAB-based graphical user interface (GUI) software tool for general biomedical signal processing and analysis of functional neuroimaging data is introduced. Specifically, electroencephalography (EEG) and electrocardiography (ECG) signals can be processed and analyzed by the developed tool, which incorporates commonly used temporal and frequency analysis methods. In addition to common methods, the tool also provides non-linear chaos analysis with Lyapunov exponents and entropies; multivariate analysis with principal and independent component analyses; and pattern classification with discriminant analysis. This tool can also be utilized for training in biomedical engineering education. This easy-to-use and easy-to-learn, intuitive tool is described in detail in this paper.

A Novel 4D Chaotic System Based on Two Degrees of Freedom Nonlinear Mechanical System

Abstract In this study, a non-linear mechanical system with two degrees of freedom is considered in terms of chaos phenomena and chaotic behaviour. The mathematical model of the system was moved to the state space and presented as a four dimensional (4D) chaotic system. The system’s chaotic behaviour was investigated by performing dynamic analyses of the system such as equilibria, Lyapunov exponents, bifurcation analyses, etc. Also, the electronic circuit realisation is implemented as a real-time application. This system exhibited vibration along with noise-like behaviour because of its very low amplitude values. Thus, the system is scaled to increase the amplitude values. As a result, the electronic circuit implementation of the 4D chaotic system derived from the model of a physical system is realised.

A New Finance Chaotic System, its Electronic Circuit Realization, Passivity based Synchronization and an Application to Voice Encryption

Abstract Modelling and control applications of dynamical systems in chaos theory arising in several areas are investigated and new control techniques are designed in the chaos literature. We propose a new complex finance chaotic model with states as the interest rate, investment demand, and price index. In this work, after studying the dynamical properties of the new finance model, an electronic chaotic circuit of the model is realized in Multisim. Based on passive control theory, we derive a new controller for globally synchronizing state trajectories of the new finance models. Using the new finance chaotic model developed in this work, a new voice encryption algorithm design is presented. With the proposed algorithm, voice encryption application is performed, and results are described.

A method for the Computational Frequency Sweep Analysis of Nonlinear ODEs using GPU Acceleration

ABSTRACT Computational sweep analysis of nonlinear ODEs (ordinary differential equations) is of importance in engineering system analysis and design. Sweep analyses usually demand intense computational power according to the number of points and the number of system parameters. This paper presents an efficient parallel algorithm for the sweep analysis of nonlinear ODEs based on graphical processing unit acceleration. The developed method preserves the jump phenomenon characteristics intrinsic to nonlinear ODEs and reduces the effects of irregular computational load. Experiments were realized using Duffing equation by sweeping frequency, amplitude, and equation coefficients. Directly, data parallel implementation and proposed implementations are compared to show the efficiency of the proposed method. Experimental results show that the new method provides significant reductions in the computational durations when compared to sequential implementation.

Chaos-based encryption of multimedia data and design of security analysis interface as an educational tool

Data encryption has always been a topical subject. There are many encryption methods in the literature. Chaos‐based encryption is considered a different area of study among the encryption practices. In this study, a novel interface was designed for chaos‐based encryption to be used as an educational tool in cryptology. With this interface, the chaos‐based encryption of multimedia data (picture, audio, text) can be done with one, two, or three dimensional discrete‐time chaotic maps. Also, the reliability of every encryption method must be checked via certain security analyses. Thus, five different security analyses (information entropy, correlation, speed effect, differential attack, and histogram analysis), where applicable, were added into the interface to perform security analyses of chaos‐based encrypted data. In this way, the chaotic encryption and security analyses, both of which need high level programming knowledge, have become available in a compact way, for those who are interested in this subject but are not knowledgeable enough about programming, hence the interface can be used as an educational tool in chaos or encryption studies.

PID Denetleyici Uygulamaları İçin Yeni Bir Online Deney Seti Tasarımı

Bu calismada muhendislik egitiminde destek olarak kullanilabilecek, DC motorun PID denetleyici ile hiz denetimi icin internet uzerinden uzaktan erisimli deney duzenegi gelistirilmistir. Deney duzenegi kablosuz olup, ortamda bulunan bir kablosuz ADSL modem araciligiyla TCP/IP uzerinden uzak sunucu ile haberlesmektedir. Kullanicilar internet baglantisi olan herhangi bir bilgisayardan uzak sunucudaki web sayfalarina eriserek gercek zamanli olarak deneyleri gerceklestirebilmektedir. Tasarlanan etkilesimli web sayfalari uzerinden, kullanicilar motorun referans hiz degerini ve PID denetleyici parametrelerini degistirerek hizin degisimini gorebilmekte ve olcum degerlerini bilgisayarina kaydedebilmektedir. Ayrica bir web kamerasi yardimiyla deney setinin calismasi da web sayfasi uzerinden izlenebilmektedir. Ayrica deney duzenegi icin cevre birimleri hazirlanarak kullanici-deney seti etkilesimi artirilmistir. Bu kapsamda kullanici web sayfasi uzerinden deney setinin bulundugu ortamin sicakligini gorebilmekte, deney seti uzerindeki LCD’ye mesajini yazdirabilmekte ve istedigi takdirde deney setini aydinlatabilmektedir.

The design and implementation of remote personel monitoring system in military zones

Nowadays, despite there are many advanced technological applications to maintain the security of buildings, premises or regions, human intervention is necessary when considering both economical facts and the effectiveness of the systems especially for the security of military zones. In the presented work, a highly secure system has been designed. With the system to be implemented, the location, postures (lying, standing, sitting, and etc.), health conditions (body temperature, heart rate, and etc.), and environment conditions of the guard officers can be monitored remotely so that the key personal can be warned to take required steps in emergency at once. The system consists of three basic devices. First, an originally designed portable Wireless Sensor Node (WSN), which detects the desired parameters and transfers them to a Wireless Central Unit (WCU) by a secure radio frequency communication, is placed on the guards. The WCU collects all information to the center coming from wireless sensor nodes. Finally, a Central Monitoring Unit (CMU), in which all information from the WCU is monitored visually and evaluated, has been designed and implemented.

Performance aspects of isMAC protocol for WBANs using isMOTES

Wireless body area networks (WBAN) consist of wireless smart sensor nodes placed on, in or around the human body for medical monitoring systems, entertainment and ubiquitous computing. The nodes in WBAN are usually battery-powered and they send sensed data from a human body, including heart rate, temperature and ECG, etc. to the medical centre to monitor the health situation of individuals. One of the major problems of a WBAN is to prolong the sensor network lifetime. To solve this major problem, different approaches are used, but the most effective one is a well-designed MAC protocol. This paper investigates three inter-BAN communication methods and suggests a coordinator node rotating mechanism to ensure energy balance among the sensor nodes and to extend the network lifetime up to 59%.