International Journal of Research and Engineering
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Comparative Study of MFCC Feature with Different Machine Learning Techniques in Acoustic Scene Classification
Get PDFThe task of labeling the audio sample in outdoor condition or indoor condition is called Acoustic Scene Classification (ASC). The ASC use acoustic information to imply about the context of the recorded environment. Since ASC can only applied in indoor environment in real world, a new set of strategies and classification techniques are required to consider for outdoor environment. In this paper, we present the comparative study of different machine learning classifiers with Mel-Frequency Cepstral Coefficients (MFCC) feature. We used DCASE Challenge 2016 dataset to show the properties of machine learning classifiers. There are several classifiers to address the ASC task. In this paper, we compare the properties of different classifiers: K-nearest neighbors (KNN), Support Vector Machine (SVM), Decision Tree (ID3) and Linear Discriminant Analysis by using MFCC feature. The best of classification methodology and feature extraction are essential for ASC task. In this comparative study, we extract MFCC feature from acoustic scene audio and then extracted feature is applied in different classifiers to know the advantages of classifiers for MFCC feature. This paper also proposed the MFCC-moment feature for ASC task by considering the statistical moment information of MFCC feature
Modeling of Phosphorous Acid Fuel Cell in PSCAD
Get PDFThe renewable energy sources, such as wind, fuel cells, etc. are gaining more attention due to the increase in energy demand as well as being environmental kindly. A dynamic model of Phosphorous Acid Fuel Cell is modeled and simulated using PSCAD/EMTDC. The system consists of a fuel cell stack along with 3-phase Pulse-Width Modulator (PWM) inverter, LCL filter and step-up transformer connected to the main grid. A Real-Reactive power controller is implemented into the 3-phase PWM inverter to control and stabilize the active and reactive power flow onto the main grid. A LCL filter is connected to the inverter side, which eliminates the ultra-harmonic distortions of the frequency. The effect of the Line-Ground, Line-Line, etc. faults on the performance of the main grid’s output voltage is analyzed and studied. The fuel cell is connected to the main grid and the simulation results contain the analysis at different stages of the simulation
Comparative Analysis of Control Techniques for PWM Rectifiers in Grid Connected Distributed Generation Systems Based on VOC and DPC
Get PDFThis paper presents Virtual flux based and Voltage based control schemes for PWM rectifiers in grid connected distributed generation systems from renewable sources are presented. In particular, the so-called Voltage Oriented Control (VOC), Direct Power Control (DPC), two DPC based techniques to minimize the Common Mode (CM) emissions called DPC-EMC1 and DPC-EMC2 set up by the authors and their versions based on virtual flux. All the described techniques have been implemented using MATLAB/Simulink® (Classic version 8.2 Release name (R2013b)) and compared with each other. Theoretical background with results of simulations is provided. The advantages and disadvantages of the individual control strategies are documented
Assistive Autonomous Mobile Robot Identifies and Retrieves Target Objects
Get PDFThis engineering article presents an original method of building and operating an assistive autonomous mobile robot based on a custom-designed LEGO® structure using Raspberry Pi® Model B computers, Dexter Industries® BrickPi boards, and LEGO NXT peripherals. The robot is programmed using the Python language to detect, identify, and handle objects in places that are inaccessible or dangerous to humans. The robot assists people with limited mobility to find and retrieve hidden or lost objects. The two distinct modes of operation are the assistive autonomous mode, and the exploratory, operator-controlled mode, respectively. In the autonomous mode, the robot moves automatically and uses its pre-programmed input parameters and signals from the ultrasonic sensors and video camera to navigate by avoiding obstacles; upon detecting the target object, the motion ceases, the robotic arm extends, grasps, and retrieves the object. The operator can afterwards direct the robot towards other zones for exploration or object retrieval. In the exploratory mode, the operator controls the movement of the robot and visualizes on a monitor the images continuously sent by the on-board video camera. Future development may consist of implementing the autonomous mode in which objects in motion will be tracked and retrieved
The Impact of Applying Electronic Management System on the English Language Level: A Case study at Cihan University
Get PDFThis research shows the advantages of applying electronic management techniques and their effect on the English language level at Cihan University – Erbil in the Kurdistan Region through discussions and checking lists, reading documents of Cihan University - Erbil, and also the comparison with the experiences of regional and international universities which have a long history in the field of electronic management. The researchers illustrate the great benefits and importance of the electronic management in many aspects of the administrative activity of the university, however these benefits might entail some of the negatives that can be by passed when using information and communication technologies in an efficient and effective way, as well as when there is a good infrastructure which we can use it to increase the English level of Cihan students. To achieve the required advantages for Cihan University when applying electronic management, with a measurement of the usefulness of those advantages compared with the costs which should be afford by the university. The researchers use the academic style in the case study by distributing a check list form to a number of workers in the university and analyze mathematically, with a number of personal interviews with heads of departments, as well as the usage of descriptive approach by referencing to the literature through books, research and reviewing experiences of countries in order to reach the most important advantages of applying electronic management. The results of the study shows many important points, important of the electronic management is not a very complex science and it will become a perquisite requirement that must be applied to all the universities in Kurdistan Region due to its fertile , good infrastructure and the quality of the available surrounding environment and conditions
A Survey on Confidential Cloud Data under Secure Key Exposure
Get PDFLatest records display a effective attacker which breaks facts confidentiality with the resource of obtaining cryptographic keys, by using the usage of way of coercion or backdoors in cryptographic software program. As soon as the encryption secrets uncovered, the only possible diploma to maintain information confidentiality is to restrict the attacker’s access to the ciphertext. This can be finished, as an instance, with the resource of spreading ciphertext blocks in the course of servers in a couple of administrative domain names, therefore assuming that the adversary cannot compromise them all. However, if data is encrypted with present schemes, an adversary prepared with the encryption key, can nevertheless compromise an unmarried server and decrypt the ciphertext blocks saved therein. On this paper, we observe records confidentiality in opposition to an adversary which knows the encryption key and has get admission to a massive fraction of the ciphertext blocks. To this quit, we advise Bastion, a singular and green scheme that ensures data confidentiality notwithstanding the reality that the encryption secrets leaked and the adversary has access to nearly all ciphertext blocks. We analyze the security of Bastion, and we examine its standard overall performance via manner of a prototype implementation. We also talk realistic insights with admire to the combination of Bastion in business dispersed garage structures. Our evaluation results endorse that Bastion is well-applicable for integration in existing structures since it incurs less than 5% overhead compared to existing semantically relaxed encryption modes
A Comparative Study of Vector Control and Model Predictive Control Technique for Grid Connected Battery System
Get PDFAdvancements made to battery energy storage technologies have led to increasing integration of battery systems with the grid. This paper presents a comparative study of the well-established vector control technique and the model predictive current control technique as applied to the grid connected battery systems. An electrical equivalent model of the battery is modeled and integrated with the grid using a three- phase bidirectional converter. The comparative study is shown for bidirectional flow of power to charge/discharge the battery from the grid. Also, the effects of model predictive control versus vector control technique are analyzed at an event of grid fault. Asymmetrical and symmetrical grid fault is considered for the comparison. All the modeling and simulation is performed in PSCADTM/EMTDCTM. The results are plotted using MATLAB R2017a. The results show that the model predictive control technique performs as good as the vector control technique for a battery connected grid system
Leaching of Nigeria Limonitic Laterite using Acidified Sodium Thiosulphate
Get PDFThis paper describes the experimental findings of the extraction of nickel and iron by atmospheric leaching (AL) of a limonitic nickel laterite ore from Akure, in Ondo State Nigeria. Using Sodium thiosulphate acidified with trichloroacetic acid the effects of concentration of the leaching reagent, leaching time, temperature and particle size of the laterite. The mineralogy of the limonitic laterite ore characterized by X- ray Diffraction (XRD) and X-ray Fluorescence (XRF). The XRF analysis of the laterite sample shows the presence of Ni, Fe, Si, etc. XRD shows hematite, goethite, taenite, quartz and smectite are present in the crystal lattice. Experimental results indicated that within the investigated conditions the leaching rate of nickel was influenced by the increase in temperature and concentration of the leaching reagents but inversely proportional to the particle size
A Method to Harness Maximum Power from Photovoltaic Power Generation Basing on Completely Mathematical Model
Get PDFThis paper introduces a new method that no previous study has been done in this photovoltaic power generation similar to this paper to harness maximum potential power from photovoltaic power generation. The completely mathematical model added the relation between diode factor of the generation and p-n junction temperature is proposed to use in this method. The maximum power point tracker combines the iterative and bisectional technique, the completely mathematical model of PVgPVG and the system of equations that converts value of parameters from standard test condition to any working condition, measuring sensors to measure power of solar irradiance and p-n junction temperature to determine parameters at maximum power point at any working condition. The voltage controller is designed to drive this generation to expect working state to harness maximum power. An experimental model corresponding to this method was designed and operated in real conditions in Viet Nam. Experimental results show the high accuracy of analyzing in theory and high capability to bring this method out real applications to harness all available energy of this generation
Assessment of Impacts of Climate Change on Hydro-meteorological Ecosystem Services and Water Stress in Lake Kyoga Catchment
Get PDFThrough review of several studies on climate change, an attempt was made to investigate the sensitivity of water resources to climate change over Lake Kyoga catchment. Climate change is predicted to increase the frequency of climatic extremes that can lead to loss of life and property. This study was mainly to analyze the water stress arising from the impacts of climate change on hydro-meteorological ecosystem services. The methodology of the study consists of analysis of available meteorological and hydrological observations, analysis of Global Weather Data for ArcGIS/SWAT output data and finally seasonal performance of precipitation and temperature using Climate Predictability Tool outputs.
The Correlation Percentage change was used to estimate the rate of change of flow and water levels under a changed climate. The outputs for different stations showed that climate change has already affected water resources in Lake Kyoga catchment with continuous reduction in water levels of 6%. The results of the study revealed that climate change is likely to increase precipitation by 10-20% received during the wet seasons resulting in higher stream flow and a reduction of 20-40% of precipitation during the dry seasons. The GCMs also demonstrated an increase in maximum and minimum temperatures of 1 to 30C by 2065 with minimum temperatures increasing more rapidly compared to the maximum temperatures for the two scenarios (RCP4.5 and RCP8.5). The strategies for adaptation and mitigation measures have been identified