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Analysis of the Lorenz Circuit using a 8-bit PIC Microcontroller
AlaaDdin Al-Shidaifat(알라딘),Seok Bung Han(한석붕),Han-Jung Song(송한정) 한국지능시스템학회 2017 한국지능시스템학회논문지 Vol.27 No.4
본 논문에서는 암호통신 응용을 위한 로렌츠 카오스 회로를 8 비트 PIC 마이크로 콘트롤러를 사용하여 설계 및 분석을 하였다. 카오스 신호를 생성하는 대표적인 시스템인 로렌츠 시스템은 3개의 1차 미분 방정식으로 표현되며, 3개의 상태변수를 가진다. 일반적으로 로렌츠 시스템은 곱셈기와 연산증폭기, 저항 및 커패시터 등 여러 개의 수동소자로 이루어지는 아날로그 회로로 구현된다. 본 논문에서 제안하는 회로는, 연산증폭기 기반 아날로그 회로와는 다르게, 8 비트 PIC 마이크로 콘트롤러 칩과 3개 디지털-아날로그 변환기로 이루어진다. 제안하는 마이크로 컨트롤러 기반의 로렌츠시스템의 경우, 3개의 미분방정식은 3개의 차분방정식으로 변환된다. 프로테우스 프로그램을 이용하여 제안하는 회로에 대한 모의실험을 실시하였다. 제안하는 마이크로 콘트롤러 기반 로렌츠 회로에 대하여, 프로테우스 프로그램에 의한 모의실험을 통하여 시간파형, 주파수 특성, 2차원 위상특성 및 3차원 위상특성 해석을 실시하였다. 매개변수 r 의 조건에 따라, 로렌츠 회로의 특성 제어가 가능하며, 최적화 된 r 의 값에서, 카오스 신호가 정상적으로 생성됨을 확인하였다. This works presents an analysis of Lorenz circuit using 8-bit PIC microcontroller. For that purpose, a chaotic oscillator which based on Lorenz system is implemented. The proposed Lorenz circuit consists of a microcontroller unit, DAC stages and three output state (x, y, z). The system is simulated using a Proteus program and shows some electrical characteristics such as time waveforms, frequency spectra, two and three-dimensional phase attractor. Using the variation of control parameter (r), electrical characteristics of the system are controlled towards the initial condition. Finally, the Lorenz circuit provides chaotic behavior and proposed for the secure communication networks application.
3D Rendering of Magnetic Resonance Images using Visualization Toolkit and Microsoft.NET Framework
Madusanka, Nuwan,Zaben, Naim Al,Shidaifat, Alaaddin Al,Choi, Heung-Kook Korea Multimedia Society 2015 The journal of multimedia information system Vol.2 No.2
In this paper, we proposed new software for 3D rendering of MR images in the medical domain using C# wrapper of Visualization Toolkit (VTK) and Microsoft .NET framework. Our objective in developing this software was to provide medical image segmentation, 3D rendering and visualization of hippocampus for diagnosis of Alzheimer disease patients using DICOM Images. Such three dimensional visualization can play an important role in the diagnosis of Alzheimer disease. Segmented images can be used to reconstruct the 3D volume of the hippocampus, and it can be used for the feature extraction, measure the surface area and volume of hippocampus to assist the diagnosis process. This software has been designed with interactive user interfaces and graphic kernels based on Microsoft.NET framework to get benefited from C# programming techniques, in particular to design pattern and rapid application development nature, a preliminary interactive window is functioning by invoking C#, and the kernel of VTK is simultaneously embedded in to the window, where the graphics resources are then allocated. Representation of visualization is through an interactive window so that the data could be rendered according to user's preference.
Cell Segmentation in Phase Contrast Microscopy by Constrained Optimization
Adiya, Enkhbolor,Vongphachah, Bouasone,Al-Shidaifat, Alaaddin,Rentsen, Enkhbat,Choi, Heung-Kook IGI Global 2015 International journal of e-health and medical comm Vol.6 No.1
<P>Utilization of automatic cell segmentation process is difficult to identify in a cell due to halo and shade-off distortions when observing the phase contrast microscopy images. Therefore, it is an important step to restore artifact-free images made ready for segmentation process. The main focus of this paper is to define a gradient projection algorithm to restore images based on the minimization problem of quadratic objective function with non-negative constraints. The proposed algorithm converges to a global minimum solution independent on initialization. The experimental result shows that the proposed algorithm can restore artifact-free images, which could produce high quality segmentation results using a simple thresholding method.</P>
스마트 사물인터넷 기기용 저리플 방식의 스텝다운 컨버터 분석
김다솔 ( Da-sol Kim ),알라딘 ( Alaaddin Al-shidaifat ),구진선 ( Jin-seon Gu ),쿠마르 ( Sandeep Kumar ),송한정 ( Han-jung Song ) 한국산업융합학회 2021 한국산업융합학회 논문집 Vol.24 No.5
Wearable devices and IoT are being utilized in various fields, where all systems are developing in the direction of multi-functionality, low power consumption, and high speed. In this paper, we propose a DC -DC Step-down C onverter for IoT smart devices. The proposed DC -DC Step-down converter is composed of a control block of the power supply stage. It also consists of an overheat protection circuit, under-voltage protection circuit, an overvoltage protection circuit, a soft start circuit, a reference voltage circuit, a lamp generator, an error amplifier, and a hysteresis comparator. The proposed DC-DC converter was designed and fabricated using a Magnachip / Hynix 180nm CMOS process, 1-poly 6-metal, the measured results showed a good match with the simulation results.