Asian Journal of Convergence in Technology
Not a member yet
868 research outputs found
Sort by
Content Protection for audio and video with secret key using Multi-wavelet
Get PDFNow-days Digital watermarking is a technology being developed to ensure and facilitate data authentication, copyright protection andsecurity of digital media. The most important properties of digital watermarking techniques are robustness, transparency, security, capacity, invert ability (reversibility) and complexity and possibility of verification. A transparent watermark causes no artifacts or quality loss.The success of the Internet, cost-effective and popular digital recording, storage devices and the promise of higher bandwidth, quality of service for both wired and wireless networks have made it possible to create, transmit, replicate, and distribute digital content in an effortless way. Digital video watermarking technique was introduced by Hembrookein 1954. Watermarking is a concept of embedding special symbol or logo or pattern watermark, in to video so that some copyright information is fed into it. This information can inform users about authority to permit the useof data, it can later prove for ownership, identify misappropriate persons, tracking of the video [1].In this paper, we proposed a digital video watermarkingwith authentication for tutorial video using Multi-wavelet. In first host video is separated into video shots. Then from each video shot one video frame is selected for embedding watermark. Each identical frame is decomposed into 3-level DWT, then select higher subband coefficients to insert the watermark and thewatermark are embedded to these coefficientsand thus guarantee perceptual unobtrusive of watermark. The paper represents the complete software implementation of 3-Level DWT algorithms and to have moresecure data a secret key is used. The secret key is given to watermark image during embedding process and while extracting the watermark image the same secret key is used
Microwave absorption property of hydrothermal synthesized RGO/PbFe12O19 nanocomposite
Get PDFIn this work, we have studied the microwave absorption properties of nanocomposite of Hexagonal shaped lead hexaferrite (PFO) with reduced graphene oxide (RGO). The hard magnetic lead hexaferrite powder is synthesized using solution combustion method and characterized using powder XRD . Nanocomposite of PFO –RGO is prepared using hydrothermal method .The as prepared nanocomposite is characterized using powder XRD and FESEM. The microwave absorption study of PFO-RGO composite is studied in 2-18 GHz. The simulated RL loss plot suggests that the PFO –RGO composite can achieve a minimum RL of -45 dB at 12 GHz. Therefore, this composite system can be used as promising microwave shield materia
Modelling of Common shaft Multi-generator Horizontal axis Wind turbine for Stability and Efficiency Enhancement
Get PDFA novel wind turbine generator system is introduced, and its mathematical model, stability criterion was tested using a prototype and also by using simulation software for the performance prediction are presented. The notable feature of WTGS is that it consists of two generator systems positioned with multi stage gear box mounted on the common low speed shaft. In this paper, this new wind turbine generator system is treated as a constrained multi-body system, and the system equations, transfer function of this novel turbine and generator architecture are obtained by using differential equations and Laplace transforms approach. The results proved it as beneficial over single generator system, extracting higher wind power by maintaining system in stable state and improved power output along with enhancement of overall efficiency and were observed experimentally and through simulations. Here we successfully designed a prototype model of HAWT with a gross mechanical power output of 645.55W and a raw electrical power of 24W using PMDC generators with the gear box ratio as 1:6.444. Finally, Mat-lab simulation software is used to predict and analyze the performance and stability of the Multi gear box multi generator wind turbine syste
Angle of Arrival Estimation for Smart Antenna using variations in MUSIC algorithms
Get PDFTo enhance the performance of wireless system gain should be increased in the desired signal direction. To increase the gain in desired direction smart antenna system is used. Smart antenna system has capability to adjust its radiation pattern in the direction of required signal and nulls in the direction of undesired signals. Angle of arrival(AOA) estimation means determining the direction of an incoming incident signal from required direction. Smart Antennas are phased array antennas having smart signal processing algorithms for finding the AOA of the required signal, which in turn is used to calculate beam-forming vectors to form the radiation pattern in the direction of signal. This paper introduces a study & implementation of algorithms for DOA estimation which are Minimum Variance Distortionless Response (MVDR) and Multiple Signal Classification (MUSIC) in terms of distance between adjacent elements, number of elements and number of snapshots
Damping characteristics of glass fiber reinforced composite with viscoelastic layers
Get PDFVibration and the composite material are two wildest growing research topics. The structural component subject to dynamic loading in their working life it causes vibration. It is very important in designing a structure to predict the vibration behavior in advance and to take necessary steps to control the structural vibration and its amplitude. Viscoelastic embedded composite material has been emphasized as an effective designing parameter for increasing damping performance of composite structure. This work presents Experimental and analytical model for energy dissipation in composite laminates embedded with viscoelastic layers at optimal position. Five different configurations for the embedded composite laminates had been fabricated as per ASTM Standards and have been compared with untreated specimen for vibration damping, strength, stiffness. The elastic and dissipative material function for shear modes has been experimentally characterised for the constituents of embedded laminates. The effects of damping layers for fiberreinforced composite materials and location of viscoelastic layers on the loss factor and frequency of treated composite has been studied. Interleaving damping layers at various locations and numbers of layers shows dramatic enhancement in damping characteristics with permissible reduction in strength and stiffness
Object picking using robotic arm mounted with a camera for detection using image processing
Get PDFIn lieu of making today’s world working environment better for humans, the field of robotics has taken up new challenge these days with devices like humanoid type robot which works on human command. Robotic arm is one of the most important parts of the humanoid. In this paper, the design of robotic arm that can be used to pick up objects of given shape and color is described. The robotic arm works with a voice command from user. This arm is realized using servo motor for joints of robotic arm, Bluetooth module, Arduino Uno, MATLAB software and a mounted camera. The designed robotic arm is practically implemented to demonstrate its effectiveness such that it is able to pick objects of given shape and color using voice command from user. The task is completed using control of servo motors via Arduino board/ MATLAB software and a camera
Provisional Micro grid For the Perfect Power System
Get PDFWith a new class of micro grids called provisional micro grids for perfect power system is introduced in this proposal. Provisional micro grids holds similar characteristics as micro grids however do not possess the islanding capability and are dependent on one or more electrically connected micr grids for islanding purposes. Removing the islanding requirements and relying on the available unused capacity of existing micro grids, characterizes provisional micro grids as enablers of rapidly deploying variable generation renewable energy resources in distribution network and further grids for preventing underutilization of capital-intensive distributed energy resources in a micro grids
Investigation on Three-Dimensional CFD Validation for a Variable Span Morphing Wing
Get PDFThis paper presents the computational design validation of a morphing wing profile that allows a change in the wing aspect ratio. Generally, the aerodynamic performance can be enhanced by changing the aspect ratio of the wing. Variable span morphing wing allows two distinct airfoil sections of the wing to extend its span using another section employing strap driven mechanism. The primary airfoil model section is maintained by NACA 4412 with span of 1.05 meters with full extension to 1.50 meters. Therefore, both two dimensional and three dimensional computational studies are carried out in a span morphed wing and un-morphed wing for various angles of attack respectively. It is found that the extended wing gives better aerodynamic performance and improved range. However, the separation phenomenon and turbulence occurs in the transition regions of wing profile. CFD FLUENT are used to understand the different flow patterns and pressure variations over the various sections of the wing. This study also demonstrates the potential effectiveness of a model meshing on the simulation and emphasizes the sensitivity of the solution outcome to the model solution setu
Cluster Based Routing Algorithms for Vehicular Adhoc Networks
Get PDFVehicular adhoc network is very important in Intelligent Transport System. Vehicular Communication plays a major in Vehicular Network. Two types of communication is possible vehicle to vehicle and vehicle to infrastructure. We need to consider two scenarios in vehicular communication. Sending the packet to nearest vehicle and sending the packet to distant one. Routing plays a major role in Vehicular adhoc network. Two types of routing algorithms are present to route packets. One type of routing algorithms, static routing algorithms compute the path in advance. Another type of routing algorithms dynamic routing algorithms, dynamic routing algorithms compute the path based on current traffic and load. Dynamic routing algorithms are more suitable for vehicular adhoc networks rather than static routing algorithms.In vehicular adhoc networks topology changes dynamically. Coming to dynamic routing algorithms distance vector routing ,link state routing,broadcasting,multicasting are more popular. Routing algorithms for vehicular adhoc networks are more suitable than dynamic routing algorithms,Adhoc on-demand routing and Destination sequence distance vector routing. And Mobile Ip For Mobile adhoc network.In this paper want to discuss about suitable routing algorithms for vehicular adhoc networks and their map-reduce paradigms.
Communication System For Ship Using Android App and Wi-Fi
Get PDFThis paper discusses Communication system for ship using Wi-Fi module and Android app. It mainly consists of two parts, Main module in Ship and Module at control room of a Ship like Geographical location like latitude and longitude Position of Ship for tilt towards right in degree, tilt towards left in degree, tilt forward in degree, tilt backward ward in degree. Fuel leakage. Fire detection in cabin. Ship Control in F-Forward, Backward, Right and Left. This information in sent to control room and harbor at 2.4 GHz frequency modulated with FSK. If fire or fuel leakage is detected, it is intimated by audio announcement, displayed on LCD and LED indication. At the control room this all information is received through Wi-Fi modem(IOT) and displayed on Mobile Commands from Mobile issued to control the ship