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27,404 Article Results

A Real-time SAR Echo Simulator Based on FPGA and Parallel Computing

10.12928/telkomnika.v13i3.1972
Xu; Beijing Institute of Technology Yinhui , Zeng; Beijing Institute of Technology Dazhi , Yan; Beijing Institute of Technology Tao , Xu; Beijing Institute of Technology Xiaoheng
This paper designs and implements a SAR (Synthetic Aperture Radar) real-time echo simulator based on multi-FPGA parallel computing. The one-dimensional frequency-domain Fourier transform algorithm is used in the simulator, and the echo signal model and the rapid calculation algorithm of impulse response function are introduced. The pipeline compute structure, multichannel parallel computing and procedure flow design are the key technologies of the simulator, which are also presented in details. And finally, the validity and correctness of the SAR echo simulator are verified through the imaging results of the point-array target and the nature scene target.
Volume: 13
Issue: 3
Page: 806-812
Publish at: 2015-09-01

Applications of Improved Ant Colony Optimization Clustering Algorithm in Image Segmentation

10.12928/telkomnika.v13i3.1803
Junhui; Hunan Vocational College for Nationalities Zhou , Defa; Hunan University of Commerce Hu
When expressing the data feature extraction of the interesting objectives, image segmentation is to transform the data set of the features of the original image into more tight and general data set. This paper explores the image segmentation technology based on ant colony optimization clustering algorithm and proposes an improved ant colony clustering algorithm (ACCA). It improves and analyzes the computational formula of the similarity function and improves parameter selection and setting by setting ant clustering rules. Through this algorithm, it can not only accelerate the clustering speed, but it can also have a better clustering partitioning result. The experimental result shows that the method of this paper is better than the original OTSU image segmentation method in accuracy, rapidity and stability.
Volume: 13
Issue: 3
Page: 955-962
Publish at: 2015-09-01

An Approach to Implement Cost Efficient Space Detection Technology with Lower Complexity for Smart Parking System

10.11591/ijeecs.v15.i3.pp415-419
Himal Pratap Singh , Om Prakash Uniyal , Kireet Joshi
As the population of world is growing day by day, there is a rapid increment in the vehicle production. With the increase in number of the vehicles, more parking spaces and efficient ways of parking are required. In the proposed system, a new and cost efficient way of finding the free spaces in parking lot is proposed and also different space detection technologies are compared. This system will be helpful for the drivers in finding the vacant spaces in the car parking lots using a simple technology in which a balloon will be used to determine the vacant parking spaces. Since this technology is cost efficient and effective,this system is termed as smart parking system.
Volume: 15
Issue: 3
Page: 415-419
Publish at: 2015-09-01

Simulation Analysis of Interface Circuits for Piezoelectric Energy Harvesting with Damped Sinusoidal Signals and Random Signals

10.12928/telkomnika.v13i3.2093
Shuai; Beijing Forestry University Pang , Wenbin; Beijing Forestry University Li , Jiangming; Beijing Forestry University Kan
Various interface circuits for collecting the energy of piezoelectric cantilever beams have been widely investigated. Such circuits include the standard interface, series synchronized switch harvesting interface circuit, parallel synchronized switch harvesting interface, synchronized charge extraction interface, and others. Most studies focus on the performance of different interface circuits with standard sinusoidal excitations. However, in real situations where constant harmonic vibrations are not present, the equivalent voltage from piezoelectric cantilever beams with excitations is not necessarily sinusoidal. In the present study, a simulation analysis of four different interface circuits with signal sources that are both damped sinusoidal and random was performed using Matlab and PSpice. The results show that the interface circuits have improved performance under low load resistance values with damped sinusoidal signal. In addition, the parallel and series synchronized switch harvesting interface circuits may perform well in collecting piezoelectric energy with random excitations.
Volume: 13
Issue: 3
Page: 767-775
Publish at: 2015-09-01

A Fast Fractal Image Compression Algorithm Combined with Graphic Processor Unit

10.12928/telkomnika.v13i3.1776
Hui; Wuzhou University Guo , Jie; Wuzhou University He
Directed against the characteristics of computational intensity of fractal image compression encoding, a serial-parallel transfer mechanism is built for encoding procedures. By utilizing the properties of single instruction and multithreading execution of compute unified device architecture (CUDA), the parallel computational model of fractal encoding is built on the graphic processor unit(GPU) in order to parallelize the considerably time-consuming serial execution process of searching for the block of best match. The experimental result indicates, the algorithm in this paper shortens the encoding time to the millisecond scale and significantly boosts the execution efficiency of fractal image encoding algorithm while keeping the decoded image in good quality.
Volume: 13
Issue: 3
Page: 1089-1096
Publish at: 2015-09-01

A Novel Technique for Fault-Tolerant Control of Single-Phase Induction Motor

10.12928/telkomnika.v13i3.1480
Mohammad; Universiti Teknologi Malaysia Jannati , Tole; Universitas Ahmad Dahlan Sutikno , Nik Rumzi; Universiti Teknologi Malaysia Nik Idris , Mohd Junaidi; Universiti Teknologi Malaysia Abdul Aziz
This research discusses about vector control of single-phase Induction Motor (IM) with two main and auxiliary windings under stator winding open-phase fault based on Indirect Rotor Flux-Oriented Control (IRFOC). Unlike conventional controller which can only be used for single-phase IM with two windings, the proposed technique in this paper can also be used for single-phase IM under open-phase fault. The proposed fault-tolerant drive system in this paper is based on using transformation matrix. Simulations results confirm the validity of the theoretical analysis.
Volume: 13
Issue: 3
Page: 783-793
Publish at: 2015-09-01

Distributed Cooperative Multicell Precoding Based on Local Channel State Information

10.12928/telkomnika.v13i3.1807
Jing; Yancheng Institute of Technology An , Guofeng; China Telecom Yancheng Branch He , Youwu; Yancheng Institute of Technology Xu , Bin; Yancheng Institute of Technology Wang , Sen; Yancheng Institute of Technology Xu
Cooperative multicell precoding is an attractive way of improving the performance in multicell downlink scenarios especially for terminals at cell edges. Multiple base stations in a given area serve each terminal after precoding, which can coordinate the inter-cell interference and achieve higher performance. Most previous work in the area has focus on centralized precoding which requires gathering all transmitters’ channel state information (CSI) at central station (CS) through backhaul and then precoding at CS. However, the requirements on backhaul signaling and computational power scales rapidly in large and dense networks, which usually make such fully centralized approaches impractical. In this paper, we study two practical precoding strategies with only local CSI under a relatively realistic scenario. Performance is finally illustrated through numerical simulations.
Volume: 13
Issue: 3
Page: 851-858
Publish at: 2015-09-01

Analysis of Secure Medical Image Communication with Digital Signature and Reversible Watermarking

10.11591/ijeecs.v15.i3.pp544-553
A. Umamageswari , G.R. Suresh
Protection of Medical image contents becomes the important issue in computer network security. Digital Watermarking has becomes a promising technique for medical content authentication, it allows to embed relevant information with the image, which provides confidentiality, integrity and authentication by embedding Digital Signature (DS) with the Medical image. In this paper we focus on need for reversible watermarking, Medical Image Compression and security related problems in medical images, it comparing the performances of various lossless watermarking techniques for various medical image modalities like MRI (Magnetic Resonance Imaging), US (Ultrasonic), CT (Computed Tomography), Endoscopic and Angiographic images. Region of Interest (ROI) supporting lossless watermarking systems only considered for discussions. Performance of all lossless watermarking with Digital Signature is analyzed by means of four parameters Capacity Rate, PSNR (Peak Signal to Noise ratio), NPCR (Number of Pixel Change Rate) and Compression Ratio (CR). This Paper also introduces new mechanism for open network security for medical images. This lossless watermarking is responsible for recovering the altered medical image content of the system.
Volume: 15
Issue: 3
Page: 544-553
Publish at: 2015-09-01

Study and Design of 40 nW CMOS Temperature Sensor for Space Applications

10.12928/telkomnika.v13i3.1426
Abhishek; Birla Institute of Technology Pandey , Vijay; Birla Institute of Technology Nath
In this paper, a novel CMOS temperature sensors based on sub-threshold MOS operation has been presented, which is designed for space and satellite applications. This proposed CMOS temperature sensor is enunciated good linearity between temperatures range from -55OC to 150OC with inaccuracy of 0.85 OC/V. This circuit is operated at supply 1V and static power consumption 40nW is achieved. The proposed circuit is based on the MOS threshold voltage and mobility. There are two type of sensor output in presented circuit first, voltage proportional to absolute temperature (PTAT) due to threshold voltage and second, negative temperature coefficient (NTC) due to mobility. This circuit is designed & simulated using Cadence analog & digital system design tools UMC90nm CMOS technology. The layout area of the circuit is 17.213μm  6.655μm. This is a low power and longer battery life for harsh environment, wireless sensor network applications etc. 
Volume: 13
Issue: 3
Page: 813-819
Publish at: 2015-09-01

Research and Application of Java Auto-Configuration and Deployment Tool Based on XML Metadata

10.12928/telkomnika.v13i3.1977
Wu; Research Institute of Petroleum Exploration & Development-Northwest Haili , Gong; Research Institute of Petroleum Exploration & Development-Northwest Renbin , Wang; Research Institute of Petroleum Exploration & Development-Northwest Congbin
With the on-line and acceptance of A11’s production management system, the operational work is becoming increasingly critical to managing distributed system. How to ensure system version update work fast, stable and efficient, become an urgent problem to be solved. We design and implement ConfigTool which is a auto-configuration and deployment tool based on XML metadata implemented by Java. ConfigTool realizes the automated processes of decompression, modification, compression and deployment of packages. In additon, we also study and optimize the file compresssion algotithm which is used in ConfigTool. Through ConfigTool, operational work can become simple and improving work efficiency.
Volume: 13
Issue: 3
Page: 1062-1068
Publish at: 2015-09-01

Simulation and Implementation Model of Productivity Measurement Internet Bandwidth Usage

10.12928/telkomnika.v13i3.1544
Tjahjanto; Institut Teknologi Bandung Tjahjanto , Benhard; Institut Teknologi Bandung Sitohang , Sudarso; Institut Teknologi Bandung Kaderi Wiryono
The Internet is used by a very large number of users, from the ordinary  user community, through special users, like people with high intellectual level. The growth in the number of users is increasing very fast. Internet has also been used by multi-sector businesses with multi profession. It makes information the internet usage something very strategic, one of which information productivity internet bandwidth usage. This paper describes a model implementation and simulation of productivity measurement internet bandwidth usage, which describes all possible measurement values obtained, and is a continuation of previous research, which is the basic concept of productivity in the use of internet bandwidth and how to measure it, so that the measuring results can be used as a guide in determine the direction of policy and the provision of productive Internet bandwidth usage.
Volume: 13
Issue: 3
Page: 1069-1078
Publish at: 2015-09-01

A Congestion Control Algorithm Based on Queuing Game for Space Information Network

10.12928/telkomnika.v13i3.1799
Chao; University of Science and Technology Beijing Guo , Haitao; University of Science and Technology Beijing Xu , Guocai; University of Science and Technology Beijing Jia , Zhiyong; University of Science and Technology Beijing Yao
In space information network, the long delay and high link error rate are the most different characteristics from the traditional ground network. Based on the queuing game theory, a novel congestion control is proposed in this paper. It assumes that the users pay an admission fee for entering the queue, and then cost during the waiting time, at last they obtain a benefit from the node when they are serviced completely. This paper not only designs a variable admission fee in order that the proposed algorithm is more suitable for the space environment, but also considers the ending profits of the game which is described by a discount rate. The simulation result shows the proposed algorithm improve the network performance.
Volume: 13
Issue: 3
Page: 844-850
Publish at: 2015-09-01

Fuzzy Logic Controller for Cascaded H-Bridge Multilevel Inverter

10.11591/ijai.v4.i3.pp105-112
N. Sivakumar , A. Sumathi
This paper proposes fuzzy logic controller based seven-level hybrid inverter for photovoltaic systems with sinusoidal pulse width-modulation (SPWM) techniques. Multi-Level Inverter technology have been developed in the area of high-power medium-voltage energy scheme, because of their advantages such as devices of high dv/dt rating, higher switching frequency, unlimited power processing, shape of output waveform and desired level of output voltage, current and frequency adjustment.This topology can be used there by enabling the scheme to reduce the Total Harmonic Distortion (THD) for high voltage applications. The Maximum Power Point Tracking algorithm is also used for extracting maximum power from the PV array connected to each DC link voltage level. The Maximum Power Point Tracking algorithm is solved by Perturb and Observer method.It has high performance with low Total Harmonic Distortion and reduced by this control strategy. The proposed system has verified and THD is obtained by using MATLAB/simulink.The result is compared with the hardware prototype working model.
Volume: 4
Issue: 3
Page: 105-112
Publish at: 2015-09-01

Secured Communication Among HMI and Controller using RC-4 Algorithmand Raspberry Pi

10.11591/ijeecs.v15.i3.pp526-532
Albert Sagala , Deni Parlindungan Lumbantoruan , Epelin Manurung , Iroma Situmorang , Adi Gunawan
In the beginning the implementation of a plant with SCADA technology, the network is formed isolated from the outside network (LAN or Internet). So it can be ascertained that the communication that occurs on the SCADA network is safe from the threat of crackers. In fact, SCADA network allows it to be connected to the Internet, so that the data of the plant can be monitored via the Internet, so the information about the state of the plant can be monitored in realtime and can be taken quickly if it is known there are anomalies on the control system. In the research we designed a method of encryption and decryption against the lines of communication between the HMI (Human Machine Interface) and the Controller on an industrial minipant contained in Lab CSRC IT Del. Raspberry Pi is used as a gateway between the HMI and the Controller. While Algorithm RC 4 are used as the algorithm for encrypting data between the HMI and the Controller. In the results, we can use the Rapsberry Pi to secure the communication between the HMI and Controller.
Volume: 15
Issue: 3
Page: 526-532
Publish at: 2015-09-01

Waypoint Navigation of AR.Drone Quadrotor Using Fuzzy Logic Controller

10.12928/telkomnika.v13i3.1862
Veronica; University of Surabaya Indrawati , Agung; University of Surabaya Prayitno , Thomas Ardi; University of Surabaya Kusuma
In this paper, AR.Drone is flown autonomously from the initial position (x,y,z) to the desired position called waypoint (xdes,ydes,zdes) using Fuzzy Logic Controller (FLC). The FLC consists of three control loops which are pitch control loop, roll control loop and vertical rate control loop. Pitch control loop is used to control the x-position of the AR.Drone; the inputs are the desired x-position and current value of x-position, while its output is the pitch.  Roll control loop is used to control the y-position of the AR.Drone; the inputs are the desired y-position and current value of y-position, while its output is the roll. Vertical rate control loop is used to control the z-position of the AR.Drone; the inputs are the desired z-position and current value of z-position and its output is the vertical rate. The algorithm is realized in three flight schemes and the navigation data is recorded. The first flight scheme: a desired x-position, xdes, of AR.Drone will be reached first followed by a desired y-position, ydes, and lastly a desired z-position, zdes.  The second flight scheme: a desired x-position and y-position, (xdes,ydes), will be reached simultaneously followed by a desired z-position, zdes. The third flight scheme: AR.Drone flies towards to desired position (xdes,ydes,zdes) simultaneously. The results show that the AR.Drone can reach the waypoint with the three schemes well. However, the flight scheme straight towards the waypoint with the FLC working simultaneously is the most satisfying one.
Volume: 13
Issue: 3
Page: 930-939
Publish at: 2015-09-01
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