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Energy saving and prolonging mileage are very important for battery-operated electric vehicles (BEV). For saving energy in BEV's the key parts are regenerative braking performances. Permanent magnet DC (PMDC) motor based regenerative braking can be a solution to improve energy saving efficiency in BEV. In this paper, a novel regenerative braking mechanism based on PMDC motor is proposed. Based on...
This paper proposes a utility supply driven single stage PFC based LED driver using Cúk converter. For low DC voltage output requirement of LED driver, Cúk converter is a convenient choice due to its topological suitability for PFC application and stepping the voltage down at a desired level unlike the Boost Converter. A hysteresis current control scheme is adopted to operate the converter in Continuous...
Changes in biological tissues change their elasticity. Elasticity imaging enjoys an ever increasing role in disease diagnosis. In elastography, tissue strain is estimated using signal processing. Strain is conventionally calculated from estimated displacements between the pre- and post-compression ultrasonic echo signals. In this paper, we introduce a novel 1.5D strain estimator. The proposed algorithm...
Accurate segmentation of breast lesions is among the several challenges in the development of a fully automatic Computer-Aided Diagnosis system for solid breast mass classification. Many high level segmentation methods rely heavily on proper initialization and the seed point selection is usually the necessary first step. In this paper, a fully automatic and robust seed point selection method is proposed...
Simpler design of control system is the key advantage of DC motor. In recent decade, however use of dc motor in battery-operated electric vehicles (BEV) are declined spectacularly. Without significant improvement of efficiency of such system the use of dc motor in BEV will be objectionable. Regenerative braking is the possible way to improve the efficiency. In this paper a novel regenerative braking...
The function of Automatic Generation Control (AGC) is to regulate the output power of the corresponding generator in response to changes in system frequency or tie line loading or in both cases within a prescribed limit. In this paper Differential Evolution (DE) based Proportional-Integral (PI) controller is designed and simulated to observe its performance for a two area Hydro-Thermal power system...
In this paper, we have evaluated the use of smooth windows for ultrasound elastography. In ultrasound elastography, local tissue strain is estimated using operations such as cross-correlation on local segments of RF data. In this process, local data segments are selected by multiplying the RF data by a rectangular window. Such data truncation causes non-ideal spectral behavior, which can be mitigated...
Load Frequency Control (LFC) for any power generating station is a subject of great concern for power system researchers. With the changes of load demand, frequency starts fluctuating which results in deviation in tie line power flow and frequency deviation at consumer end. To overcome this problem, many control techniques have been adopted. In early days fixed value integral/proportional-integral...
Time Delay Estimation is a basic technique used for locating and tracking radiating acoustic source. TDE process is common for studying signal-to-noise ratio, input signals and systems that are common in process industry. The delay estimate is acquired using the generalized cross-correlation function applied between the original and the time-lagged filtered version of the received signal. In recent...
In the recent years strain imaging technique which is Elastography incepted a promising horizon of potentiality for detecting deep lying abnormal stiff nodules such as tumor, one of the primary symptoms of vulnerability towards cancer. Generating strain images applying two dimensional thin plate smoothing (TPS) spline based approach is definitely a superior method with its 1D counterpart considering...
This paper articulates the factors primarily responsible for rapid growth of Captive Power Plants (CPPs) in Bangladesh. It also focuses on how natural gas has become the top energy source for these CPPs. Effects of inefficient use of natural gas and associated problems in CPPs are also discussed in brief. A detailed study on gas based captive power generation in Bangladesh may reveal some ways to...
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