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This paper proposes a DC link controller based on H∞ method for robust and reliable operation of a single-phase grid-connected inverter with an LCL-filter in photovoltaic (PV) applications. The H∞ DC link controller minimizes the bus voltage fluctuations caused by the power variations of PV system. Also, the controller ensures system robustness against such power variations, which conventional controllers...
The third generation molecule of supramolecule chemistry, the calixarenes, is superior to the first and second generation molecules, Taç Ethers and Cyclodextrins, due to their ability to be obtained in greater quantities in higher purity and easier to function. The fact that the calixarenne compounds are important in the host-guest chemistry, and that they are ring structures, can carry molecules,...
In this work, we conducted a study for choosing suitable sensors for indoor localization of multi-node systems. This study is used to compare the performance of the cheapest and most appropriate sensors for measuring the distances among nodes at indoor environments which are the ultrasonic and the infrared sensors. Practical circuits for these sensor types are built and tested in an environment which...
Wind energy has emerged as a strong alternative to fossil fuels for power generation. To generate this energy, wind turbines are placed in a wind farm. The extraction of maximum energy from these wind farms demands an efficient layout of the wind farms. This layout determines the location of each turbine in the wind farm. Due to its sheer complexity, the wind farm layout design problem is considered...
Transcription factor binding sites on human DNA are the target locations of specific proteins called transcription factors. Gene expression process begins when a transcription factor binds to its target location in the genome. Expensive experimental methods are used to identify a limited number of these binding sites, hence there is essential need for computational algorithms. In this paper, we train...
We introduce a new approach for the elastic registration of high-resolution 3D polarized light imaging (3D PLI) data of histological sections of the human brain. For accurate registration of different types of 3D PLI modalities, we propose a novel intensity similarity measure that is based on a least-squares formulation of normalized cross-correlation. Moreover, we present a fully automatic registration...
The development of fake iris detection systems, which is one of the most important topics in the biometric field, is growing rapidly. In this paper, discriminative statistical features are used for differing between real and fake iris images. The multilevel 2-D wavelet decomposition is employed to obtain approximation and detail wavelet channels. For feature classification, Euclidean distance and...
Electrocardiogram (ECG) signals are one of the most common and important physiological signals for assessing cardiovascular health. The rapid advancement in wearable technology has opened new avenues for continuous monitoring of various cardiovascular diseases (CVDs) in non-clinical settings. At the same time, the amount of data available for analysis due to these unobtrusive sensors has increased...
The maintenance of static standing balance is not only essential for performing everyday activities but is also an important risk factor for prediction of falls in the elderly adults. Human balance / posture control is controlled by complex integration of different senses. The changes in steadiness of balance can be characterized by center-of-pressure (COP) signals measured from a 3-D force plate...
In this paper, we study the performance of different classifiers on the CIFAR-10 dataset, and build an ensemble of classifiers to reach a better performance. We show that, on CIFAR-10, K-Nearest Neighbors (KNN) and Convolutional Neural Network (CNN), on some classes, are mutually exclusive, thus yield in higher accuracy when combined. We reduce KNN overfitting using Principal Component Analysis (PCA),...
We propose a swarm-based optimization algorithm inspired by air currents of a tornado. Two main air currents — spiral and updraft — are mimicked. Spiral motion is designed for exploration of new search areas and updraft movements is deployed for exploitation of a promising candidate solution. Assignment of just one search direction to each particle at each iteration, leads to low computational complexity...
This paper focuses on presenting an efficient underwater acoustic communication system for image transmission. Water nature slows propagation speed down, and corrupts the transmitted signal. Moreover, the channel capacity is limited. The proposed system aims at effectively withstanding channel effects, minimizing the bit error rate and obtaining images with acceptable quality at the receiver. This...
Breast cancer is one of the most common cancers worldwide. Breast cancer rates are high in low- and middle-income countries, where breast tumors are diagnosed late. Early detection of masses or abnormalities that indicate breast cancer is a very important step for treating breast cancer in its first stages. The early detection of breast cancer tumors depends on both the ability of radiologists to...
The security of data over the internet is a crucial thing specially if this data is personal or confidential. The transmitted data can be intercepted during its journey from device to another. For that reason, we are willing to develop a simple method to secure data. Data encryption is one method to secure the messages but the intruders can still try to crack it, in order to overcome this, steganography...
Step adjustment for humanoid robots has been shown to improve robustness in gaits. However, step duration adaptation is often neglected in control strategies. In this paper, we propose an approach that combines both step location and timing adjustment for generating robust gaits. In this approach, step location and step timing are decided, based on feedback from the current state of the robot. The...
E-learning is one way of learning, training or educating by electronic means. There are various approaches used for e-learning like Claude based approach, ontology based approach, semantic net approach, electronic course content management, also neuro-fuzzy based approach etc. This paper focuses on the Neuro-Fuzzy based approaches for e-learning. For this purpose different neuro systems, fuzzy systems...
Electricity is first Generated then Transmitted over long distances and at last Distributed (D) to customers. During this method of GTD, energy losses happen. Technical losses square measure those losses that occur attributable to properties of materials utilized in transmission and distribution system. Energy loss is outlined because the distinction between energy generated and beaked on customers...
In this paper, an optimal decentralized controller is designed for the load frequency control of a microgrid with multiple synchronous generation systems and renewable energy sources in the islanded mode of operation. The decentralized controller includes multiple proportional-integral (PI) controllers designed and optimized simultaneously by using a classical descent-direction Quasi-Newton based...
This paper introduces a method to improve the feedback accuracy using multisensor data fusion. Flexibility in cables and unmodeled rotation of feeder pulley in the spatial workspace cause unreliability in the encoder data as well as sagging in cables. The purpose of this work is to provide an effective scheme to combine other sensors' information from multiple sources to increase the precision and...
This paper focuses on a lower limb walking assistant robot. This robot has been designed and modeled for two tasks of facilitating healthy people, and assisting patients for walking. First, basic concepts of the motion mechanism are presented. Next, its kinematics and dynamics equations have been developed. Kinematics analysis has been done using Denavit-Hartenberg scheme to obtain position, velocity...
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