In this paper we describe the lung nodule detection through image processing methods. Therefore, in the preprocessing stage, we use a medical-like method to omit all objects that surely they are not nodule. In this way nodule candidates are obtained. Therefore, false positives decay, while rate of main process does not increase. Finally, nodule candidates […]
In this paper a new zero voltage switching current fed half bridge converter with an auxiliary circuit is proposed. The auxiliary circuit not only absorbs the voltage surge across switches at turn off instance, but also provides zero voltage switching condition for all converter switches. Therefore in this converter the efficiency is higher than hard […]
One of the methods in creating disturbance in radar is to apply appealing jammer. These jammers send strong signals like target-return signals into radar. If these signals enter from main lobe of radar antenna, create false targets in different ranges. Besides if they enter from secondary lobes, radar receiver is not able to distinguish between […]
We investigate the effect of ASE(Amplified Spontaneous Emission) on the gain modulation, that also referred to overmodulation. The gain modulation is the low-frequency (kHz) amplitude modulation of the EDFA pump and the communication signal used for propagating line monitoring information. We develop the model of Novak and Moesle (2002), by including ASE, that they neglected. […]
Language identification (LID) in speech signals is an important classification task. In this paper Persian language verification is proposed and evaluated. The system is developed by using Gaussian mixture models as a basic system for tokenizing and a Neural Network as the backend processor. Gaussian Mixture Models can be utilized to model the distribution of […]
In this paper a fully integrated CMOS Distributed Amplifier is presented. This DA can be used for broadband optical and wireless communication applications. A four stage cascode DA is designed and optimized. A critical problem in CMOS RFIC design is the parasitic elements of transistors and inductors and this problem makes handed design methodology complex. […]
Due to expansion of photonic crystal fiber (PCF) based optical devices in optical communication networks, the connection process between conventional optical fibers (COF) as transmission medium and these devices has attracted the researchers. Considering the splice joint between the COF and PCF, in this paper, the fundamental core and cladding modes are analyzed by scalar […]
During the last few years, evaluation of MIMO systems capacity has been expanded, due to more bandwidth demands. In this paper, after reviewing the previous works, a new formula for MIMO systems capacity, in the case of uniformly distributed channel error is given. While in previous works, Gaussian distribution is the preliminary assumption of almost […]
A complimentary topology is used incorporating TSMC 0.18 mm process to design a CMOS VCO with the center frequency of 5.4 GHz. Simulation results showed tuning range of 13%. The phase noise at 1 MHz offset was measured to be -118.7 dBc/Hz. The VCO core power consumption was 3.3 mW when the power supply voltage […]
Electrical motor with high performance and maintenance free is very atteractive for the special application in the case of limited energy sources and long operating board. Permenant magnet brush DC motor is very good candidate for such specific applications. In this paper,at first a mathematical model of the motor is persented then, a method for […]
