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Nowadays, there are many commercial ANC (Active Noise Control) headphones using either digital signal processors (DSPs) as control unit to implement the feedback FXLMS algorithm, or analog circuit by using control theory's feedback structure to cancel the noise in active way. However, for DSP's product, it's much expensive than conventional passive headphone. As a result, this paper proposed using...
This paper presents a novel direct adaptive controller design via decomposed fuzzy Petri net to solve the control tracking problem. The controller combines decomposed fuzzy system (DFS) and Petri net to achieve good performance with less computation time. In the DFS structure, fuzzy variables are decomposed into several layers. DFS has been shown to have fast learning capability but with a complicated...
This study proposed a bidirectional DC/DC converter with inductor attached at the output terminal to a output voltage. We developed n switched capacitors capable of multiple outputs ranging from 2 to n times the input voltage based on a fixed input voltage source during forward boost with output ranging from 1/2 to 1/n times the input voltage during reverse buck. The inductor was designed to work...
With the increasing needs of global communication, the improvement of secure communication is of vital importance. This study proposes a new scheme for establishing secure communication systems. A master chaotic system is embedded at the transmitter. The message signal is mixed with a chaotic signal and then transmitted to the receiver through the public channels. A synchronization signal mixed with...
The alarm system of mechanical ventilator is important to alert caregiver to perform specific procedure to keep patient away from complication. However, the conventional alarm signals are badly designed and always non-specific which can not provide clear information for caregiver to make decision immediately. Therefore, the intelligent alarm system that we try to develop is to provide clear information...
This paper uses the phase feature of steady-state visual evoked potential (SSVEP) to implement a brain-computer interface (BCI) system. The proposed system composes with a LED stimulation panel, a biomedical signal processed circuit, and an field-programmable gate array (FPGA)-based real-time signal processor. This design is different from the other BCI systems, which uses expensive electroencephalography...
In this paper, a novel algorithm for intensity inhomogeneous image segmentation is proposed. The presented method introduces a signed pressure force function using the local information of the image to be segmented. Thus, this model can work with heterogeneous images. In addition, by taking the advantages of Geodesic active contour (GAC) and Chan-Vese (C-V) model, the method could deal with objects...
In this paper, a novel model for intensity inhomogeneous image segmentation is proposed. The proposed model uses the local information of the image to be segmented; concurrently, it incorporates the geodesic active contour (GAC) model into Chan-Vese (C-V) model in energy function. Thus, the proposed model is effective when dealing with intensity inhomogeneous images. Practical experiments prove that...
Segmentation is an important step in medical image analysis. This process is crucial but challenging due to inhomogeneneity in intensity of images. In addition, the images are often corrupted by noise and with contrast edges. There are some approaches aiming to cope with this kind of images such as: region growing, region competition, watershed segmentation, global thresholding, and active contour...
In this paper, a novel algorithm for image segmentation is proposed. The presented method embeds the Geodesic Active Contour (GAC) model into the region based method. The proposed model adds a term that relates the region information of image to be segmented to the energy function of Geodesic Active Contour model. As a result, a new energy function is established. This method therefore includes both...
In this study, an steady-state visual evoked potential (SSVEP) - based brain computer interface (BCI) has been developed to wirelessly handle a remote-controlled car. Three flickers, flickering at distinct frequencies (13 Hz, 14 Hz, and 15 Hz), were displayed on a liquid crystal display (LCD) monitor to induce user's SSVEPs, which were used control three movement functions (forward, leftward, rightward)...
Snakes, or active contours, have been widely used to locate boundaries of image segmentation and computer vision. Problem associated with the existence of the local minima in the active contour energy function makes snakes have poor convergence in segmentation process; therefore, the poor convergence has limited applications. In this work, a fast minimization of snake model is used for an MRI knee...
In this paper, a Takagi-Sugeno fuzzy model (T-S fuzzy model) is proposed for a single-phase shunt active power filter (APF) to improve line power factor and to reduce line current harmonics. The proposed active power filter controller forces the supply current to be sinusoidal with low current harmonics and in phase with the line voltage. To design fuzzy controllers, bilinear model of the active power...
This study establishes an intelligent battery charging system using inductive transmission of power and fast full-duplex information. The inductive charging system improves the drawback like failure connection, sparking and the risk of electrical shock of the conventional charging system. Inductive transmission of power and information has the advantages of safety, reliability, and convenience. The...
A zero voltage switching (ZVS) based on LLC resonant topology is proposed to implement a single-stage ac/dc converter which performs both input-current harmonics reduction and power factor correction (PFC). By integrating a boost-PFC cell and an LLC resonant dc/dc cell into a single power conversion stage, the power losses in the secondary rectifier diodes and the primary switches can be significantly...
This paper proposes a fuzzy state-of-charge (SOC) estimation for ReflexTM battery charging, which allows rapid and efficient charging for sealed lead-acid batteries used in electric vehicles. The proposed SOC estimation can avoid undercharging or overcharging. Overcharge in particular can shorten a battery's lifetime. The charging control and the SOC estimation are based on fuzzy theorem and they...
This paper presents an anti-swing control for underactuated overhead crane systems. The minimizing load-swing angle and maximizing the speed of load transfer along the pre-specified path are contradict to each other, which indicates the stability of swing dynamics of load and accurate trolley position control are hard to consider and implement simultaneously by using fewer actuators. In this study,...
In this paper, model reference adaptive control (MRAC) is proposed for a single-phase shunt active power filter (APF) to improve line power factor and to reduce line current harmonics. The proposed active power filter controller forces the supply current to be sinusoidal with low current harmonics and in phase with the line voltage. The advantages of using MRAC over conventional proportional-integral...
In this paper, an automatic frequency shifting technique is developed for achieving output voltage regulation of LLC series resonant converter (LLC-SRC). Furthermore, the operating modes and dc characteristics are discussed for designing the steady state operating point. Finally, an LLC-SRC, rated about 90 W with operating frequency range from 92 KHz to 102 KHz is provided to verify the control strategy...
In this paper, an automatic frequency shifting technique is developed for achieving output voltage regulation of LLC series resonant converter (LLC-SRC). Furthermore, the operating modes and dc characteristics are discussed for designing the steady state operating point. Finally, an LLC-SRC, rated about 90 W with operating frequency range from 92 KHz to 102 KHz is provided to verify the control strategy...
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