حسین میارنعیمی
- دانشیار، دانشکده مهندسی برق- دانشگاه صنعتی نوشیروانی بابل - بابل- ایران
[ 1 ] - تشخیص خودکار خطا در شبکه حسگرهای دمایی مبتنی بر فیلتر کالمن و جبران سازی برخط خطا با استفاده از الگوریتم ژنتیک
جایگاه حسگرها در صنایع و علوم مختلف به عنوان یک عنصر اساسی و حیاتی، غیرقابل انکار می باشد. بنابراین موضوع خطایابی و رفع خطا در حسگرها اهمیت ویژه ای دارد. دراین تحقیق، یک شبکه از حسگرها شامل چند حسگر دما در نظر گرفته می شود به گونه ای که متوسط دمای حسگرها به عنوان دمای اندازه گیری شده در نظر گرفته می شود. برای مقاوم سازی سیستم در مقابل خطا ابتدا با استفاده از فیلتر کالمن خطای واقع شده تشخیص داده...
[ 2 ] - Closed-Form Analytical Equations to Transient Analysis of Bang-Bang Phase-Locked Loops
Due to the nonlinear nature of the Bang-Bang phase-locked loops (BBPLLs), its transient analysis is very difficult. In this paper, new equations are proposed for expression of transient behavior of the second order BBPLLs to phase step input. This approach gives new insights into the transient behavior of BBPLLs. Approximating transient response to reasonable specific waveform the loop tran...
[ 3 ] - Nonlinear optimized Fast Locking PLLs Using Genetic Algorithm
Abstract— This paper presents a novel approach to obtain fast locking PLL by embedding a nonlinear element in the loop of PLL. The nonlinear element has a general parametric Taylor expansion. Using genetic algorithm (GA) we try to optimize the nonlinear element parameters. Embedding optimized nonlinear element in the loop shows enhancements in speed and stability of PLL. To evaluate the perform...
[ 4 ] - یک روش مؤثر برای قطعه بندی تصاویر بااستفاده از ساختار پیکسونی و به کارگیری مفهوم میدان تصادفی مارکوف
یکی از مباحث مهم و نسبتاً مشکل در پردازش تصویر، تفکیک تصویر به اجزای سازندة ( قطعه بندی) آن است که در موفقیت یا ناموفق بودن تحلیل تصویر بسیار مؤثر است. در این مقاله، بااستفاده از مفهوم پیکسون و میدان های تصادفی مارکوف روش جدیدی برای قطعه بندی تصاویر پیشنهاد می شود. در روش پیشنهادی ابتدا تصویر به صورت یک تصویر پیکسونی مدل می شود و تنها پیکسون های تصویر ارزیابی می شود، نه همة پیکسل های آن. سپس باا...
[ 5 ] - Effective Design of a 3×4 Two Dimensional Distributed Amplifier Based on Gate Line Considerations
In this paper two dimensional wave propagation is used for power combining in drain nodes of a distributed amplifier (DA). The proposed two dimensional DA uses an electrical funnel to add the currents of drain nodes. The proposed structure is modified due to gate lines considerations. Total gain improvement is achieved by engineering the characteristic impedance of gate lines and also make appr...
[ 6 ] - Low Settling Time All Digital DLL For VHF Application
Settling time is one of the most important parameter in design of DLLs. In this paper we propose a new high speed with low settling time Delay Locked Loop (DLL) in which a digital signal processor (DSP) is used instead of using phase-frequency detector, charge pump and loop filter in conventional DLL. To have better settling time, PRP conjugate gradient algorithm is used to optimize delay of ea...
[ 7 ] - Analysis of Oscillation Amplitude and Phase Error in Multiphase LC Oscillators
Abstract This work proposes a novel method to find the phase error and oscillation amplitude in multiphase LC oscillators. A mathematical approach is used to find the relationship between every stage's output phase and its coupling factor. To much more general analysis, every stage assumed to have a different coupling factor. The mismatches in LC tanks are considered as the main source of pha...
[ 8 ] - A Novel Low Voltage, Low Power and High Gain Operational Amplifier Using Negative Resistance and Self Cascode Transistors
In this work a low power, low voltage and high gain operational amplifier is proposed. For this purpose a negative resistance structure is used in parallel with output to improve the achievable gain. Because of using self cascode transistors in the output, the proposed structure remains approximately constant in a relatively large output voltage swing causing an invariable gain. To evaluate the...
[ 9 ] - Statistical Background Modeling Based on Velocity and Orientation of Moving Objects
Background modeling is an important step in moving object detection and tracking. In this paper, we propose a new statistical approach in which, a sequence of frames are selected according to velocity and direction of some moving objects and then an initial background is modeled, based on the detection of gray pixel's value changes. To have used this sequence of frames, no estimator or distribu...
[ 10 ] - Image Restoration Using A PDE-Based Approach
Image restoration is an essential preprocessing step for many image analysis applications. In any image restoration techniques, keeping structure of the image unchanged is very important. Such structure in an image often corresponds to the region discontinuities and edges. The techniques based on partial differential equations, such as the heat equations, are receiving considerable attention i...
[ 11 ] - A Phase Noise Reduction Technique in LC Cross-coupled Oscillators with Adjusting Transistors Operating Regions
In this paper, an intuitive analysis of a phase noise reduction technique is done, and then a modified structure is proposed to achieve higher phase noise reduction than the original one. This method reduces the impact of noise sources on the phase noise by decreasing closed-loop gain in zero-crossings points and moving this high closed-loop gain to the non-zero-crossings points. This reduction...
نویسندگان همکار