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27,404 Article Results

Dynamic Stability Improvement of Multimachine Power Systems using ANFIS-based Power System Stabilizer

10.12928/telkomnika.v13i4.2049
Agung Budi; Mataram University Muljono , I Made; Mataram University Ginarsa , I Made Ari; Mataram University Nrartha
Modern power system are very vurnerable to against load fluctuation during their operation. Load fluctuation identified as small disturbance is important to test dynamic (small signal) stability. This research is focused on improvement of multimachine dynamic stability by using ANFIS-based power system stabilizer (proposed PSS). ANFIS method is proposed because the ANFIS computation is more efective than Mamdani fuzzy computation. Simulation results show that the proposed PSS is able to maintain the dynamic stability by decreasing peak overshoot (Po) to the value -3,37´10-5 pu/pu and accelerating settling time (St) to the time 4.01 s for rotor speed deviation Machine-2. Also, the Po is decreased to the value -3,37´10-5 pu/pu and the St is accelerated to the time 3.98 s for rotor speed deviation Machine-3.
Volume: 13
Issue: 4
Page: 1170-1178
Publish at: 2015-12-01

Tissue-like P system based DNA-GA for clustering

10.11591/ijeecs.v16.i3.pp565-573
Caiping Hou , Xiyu Liu
In recent years, DNA GA algorithm is drawing attention from scholars. The algorithm combines the DNA encoding and Genetic Algorithm, which solve the premature convergence of genetic algorithms, the weak local search capability and binary Hamming cliff problems effectively.How to design a more effective way to improve the performance of DNA-GA algorithm is more worth studying. As is known to all,the tissue-like P system can search for the optimal clustering partition with the help of its parallel computing advantage effectivel. This paper is under this premise and presents DNA-GA algorithm based on tissue-like P systems (TPDNA-GA) with a loop structure of cells, which aims to combine the parallelism and the evolutionary rules of tissue-like P systems to improve performance of the DNA-GA algorithm. The objective of this paper is to use the TPDNA-GA algorithm to support clustering in order to find the best clustering center.This algorithm is of particular interest to when dealing with large and heterogeneous data sets and when being faced with an unknown number of clusters. Experimental results show that the proposed TPDNA-GA algorithm for clustering is superior or competitive to classical k-means algorithm and several evolutionary clustering algorithms.
Volume: 16
Issue: 3
Page: 565-573
Publish at: 2015-12-01

Current Ripple Analysis of New Double-Stator AC Drive Systems

10.12928/telkomnika.v13i4.3165
Irham; Universitas Negeri Malang Fadlika , A. N.; Universitas Negeri Malang Afandi , Pekik Argo; Institut Teknologi Bandung Dahono
This paper presents a current ripple analysis of new double-stator AC drive system. At first, a new double-stator AC drive system is proposed. The aim is to combine the benefits both the multilevel and multiphase system to provide the better performance to drive AC motor. The input and output current ripples of the proposed AC drive system are then analyzed. The current ripples of the proposed AC drive system are then compared to the ones of conventional double-stator AC drive system. Under the same DC input voltage, it is shown that the proposed results in less output current ripple. Under the same output voltage, the proposed AC drive system results in smaller input current and, therefore, fewer losses on the DC power supply. Experimental results are included to show the validity of the proposed concept.
Volume: 13
Issue: 4
Page: 1204-1213
Publish at: 2015-12-01

Analysis of Amplify-and-Forward Cooperative Networks with Nakagami-m fading Channels For MRC Diversity Combining

10.11591/ijeecs.v16.i3.pp546-552
Ali Abdulwahhab Mohammed , Li Yu , Manar Al-Kali , Desheng Wang
In this paper we study the effect of diversity combining for Nakagami -m fading Channels in the amplify-and-forward cooperative networks.We derive the cumulative density function (CDF), probability density function (PDF) and moment generating function (MGF) for the multiple relay amplify-and-forward network with single half duplex channel maximal ratio combiner (MRC). In this network we investigate the cases of MRC at the destination, as well derive the exact Symbol Error Rate (SER) of M-ary phase-shift keying (M-PSK), and quadrature amplitude modulation (M-QAM) in Nakagami -m fading environment. We present a comparison between M-PSK and M-QAM modulation schemes in some representative scenarios where an arbitrary number of cooperative relays is considered.
Volume: 16
Issue: 3
Page: 546-552
Publish at: 2015-12-01

Conventional DC Voltage Operating System for High Speeed Traction Power Supplies Using LLC-HPQC Control

10.11591/ijai.v4.i4.pp118-128
Ch. Lenin Babu , P. Harinath Reddy , T. Reddi Sekhar
In this paper a hybrid power quality compensator (HPQC) is proposed for compensation in cophase traction power supply and minimum dc operation voltage is achievable for high-speed traction power supply. The parameter design procedure for minimum dc operation voltage in HPQC as well as minimum voltage rating with load PF is discussed. The detailed discussions of proposed circuit configurations of HPQC are provided in section II, together with comparison with conventional RPC. In comparison with conventional railway power compensator proposed HPQC can achieve reduced dc link voltage level. It is also verified through simulations results that the LLC-HPQC would operate at the minimum voltage with the proposed parameter design. HPQC is able to provide system unbalances, reactive power, and harmonic compensation in cophase traction power with reduced operation voltage. The cophase traction power supply with proposed HPQC is suitable for high-speed traction applications.
Volume: 4
Issue: 4
Page: 118-128
Publish at: 2015-12-01

Optimal Economic Ordering Policy with Trade Credit and Discount Cash-Flow Approach

10.12928/telkomnika.v13i4.2910
Hao; Suzhou University Jiaqin , Mo; Guangxi University Jiangtao , Min; Anhui Jianzhu University Jie
In this paper, an inventory model for deteriorating items under two levels of trade credit will be established. The trade credit policy depends on the retailer’s order quantity. When the retailer’s order quantity is greater than or equal to a predetermined quantity, both of the supplier and the retailer are taking trade credit policy; otherwise, the delay in payments is not permitted. Since the same cash amount has different values at different points of time, the discount cash-flow (DCF) is used to analysis the inventory model. The purpose of this paper is to find an optimal ordering policy to minimizing the present value of all future cash-flows cost by using DCF approach. The method to determine the optimal ordering policy efficiently is presented. Some numerical examples are provided to demonstrate the model and sensitivity of some important parameters are illustrated the optimal solutions.
Volume: 13
Issue: 4
Page: 1486-1494
Publish at: 2015-12-01

Research on Silicon-based Planar Spiral Inductance Coil Based on Microelectromechanical System

10.12928/telkomnika.v13i4.1818
Gang; Heilongjiang University Li , Xiaofeng; Heilongjiang University Zhao , Dianzhong; Heilongjiang University Wen , Yang; Heilongjiang University Yu
This paper describes a kind of silicon-based plane spiral inductance coil ,whose layout size and fabrication technology process are given. The production of inductance coil adopts the method of an internal down-lead produced by ohm contact electrode which is formed by heavily boron- diffused and the Al evaporated on the surface of N-type high resistivity silicon wafer. Processing the silicon cup on The back of the silicon wafer using Microelectromechanical system (MEMS) technology, on the basis of thickness reduction of the inductance coil substrate, the porous array substrate of about 5μm thickness is obtained by laser drilling on the underside of the silicon cup, which reduces the vortex of substrate, and greatly improves the Q value of inductance coil. Analyze the effects of series resistance of the coil and metal layer thickness on the Q value in the condition of low frequency and high frequency, and Ansys software is used to simulate the inductance coil current density and magnetic induction intensity, to determine the optimum substrate thickness of inductance coil. The silicon-based plane spiralind inductance coil has the advantages of simple manufacturing process and is compatible with IC technology, compared with other manufacturing method, so it has a wide application prospect.
Volume: 13
Issue: 4
Page: 1127-1132
Publish at: 2015-12-01

Modelling on Tracking Test Condition of Polymer Nanocomposite using Finite Element Simulation

10.12928/telkomnika.v13i4.2362
Fatin Liyana; Universiti Teknologi Malaysia Muhamedin , M. A. M.; Universiti Teknologi Malaysia Piah , Nordiana Azlin; Universiti Teknologi Malaysia Othman
Electrical tracking is a formation process of a permanent conducting path across the insulating material due to surface erosion under high voltage stress. The existing of leakage current (LC) on the wet contaminated material surface causes the generation of surface discharges that resulted in the material degradation. The effects of electric field distribution and current density on LLDPE-Natural Rubber blends material were investigated using finite element method (FEM) analysis. In this paper, a variety of physical parameters particularly contaminant flow rate, various applied voltages, material properties of permittivity and conductivity were studied when nanofiller is added to LLDPE-Natural rubber blend. The simulation works using FEM software of Quickfield was applied to the tracking test condition of IEC 60587 standard.  The results show that the electric field distributions are critical on the edges of contaminant solution path at higher voltage level. The current density and electric field distribution is increase with higher applied voltage. The polymer nanocomposite with 1-5 % of nanofiller exhibits a good resistance to tracking and erosion test.
Volume: 13
Issue: 4
Page: 1194-1203
Publish at: 2015-12-01

A Neighbor-finding Algorithm Involving the Application of SNAM in Binary-image Representation

10.12928/telkomnika.v13i4.1899
Jie; Wuzhou University He , Hui; Wuzhou University Guo , Defa; Hunan University of Commerce Hu
In view of the low execution efficiency and poor practicability of the existing neighbor-finding method, a fast neighbor-finding algorithm is put forward on the basis of Square Non-symmetry and Anti-packing Model (SNAM) for binary-image. First of all, the improved minor-diagonal scanning way is applied to strengthen SNAM’s adaptability to various textures, thus reducing the total number of nodes after coding; then the storage structures for its sub-patterns are standardized and a grid array is used to recover the spatial-position relationships among sub-patterns, so as to further reduce the complexity of the neighbor-finding algorithm. Experimental result shows that this method’s execution efficiency is significantly higher than that of the classic Linear Quad Tree (LQT)-based neighbor-finding method.
Volume: 13
Issue: 4
Page: 1319-1329
Publish at: 2015-12-01

Double Difference Motion Detection and Its Application for Madura Batik Virtual Fitting Room

10.12928/telkomnika.v13i4.2236
Rima; University of Trunojoyo Madura Triwahyuningrum , Indah Agustien; University of Trunojoyo Madura Siradjuddin , Yonathan Fery; University of Trunojoyo Madura Hendrawan , Arik; University of Trunojoyo Madura Kurniawati , Ari; University of Trunojoyo Madura Kusumaningsih
Madura Batik Virtual Fitting Room using double difference algorithms motion detection is proposed in this research. This virtual fitting room consists of three main stages, i.e. motion detection, determination of region of interest of the detected motion, superimposed the virtual clothes into the region of interest. The double difference algorithm is used for the motion detection stage, since in this algorithm, the empty frame as the reference frame is not required. The double difference algorithm uses the previous and next frame to detect the motion in the current frame. Perception Test Images Sequences Dataset are used as the data of the experiment to measure the performance accuracy of this algorithm before the algorithm is used for the Madura batik virtual fitting room. The accuracy is 57.31%, 99.71%, and 78.52% for the sensitivity, specificity, and balanced accuracy, respectively. The build Madura batik virtual fitting room in this research can be used as the added feature of the Madura batik online stores, hence the consumer is able to see whether the clothes is fitted to them or not, and this virtual fitting room is also can be used as the promotion of Madura batik broadly.
Volume: 13
Issue: 4
Page: 1446-1455
Publish at: 2015-12-01

A Controller Design Researh Based on the Cloud Model

10.11591/ijeecs.v16.i3.pp531-538
Feng Jie , Jingfang Wang
A novel control structure model is proposed based on cloud model for the first time．The structure model is a nonlinear model in nature, and it can be composed of a group of uncertain reasoning rules easily．NonIinear mapping characteristics of cloud model is analysed in this sudy, and the design method of the intelligent controller is presented based on the structure model, and some simulation examples are showed．
Volume: 16
Issue: 3
Page: 531-538
Publish at: 2015-12-01

The Analysis of Rank Fusion Techniques to Improve Query Relevance

10.12928/telkomnika.v13i4.2736
Diyah; University of Bengkulu Puspitaningrum , Jeri Apriansyah; University of Bengkulu Pagua , Aan; University of Bengkulu Erlansari , Fauzi; University of Bengkulu Fauzi , Rusdi; University of Bengkulu Efendi , Desi; University of Bengkulu Andreswari , I.S.W.B.; Utrecht University Prasetya
Rank fusion meta-search engine algorithms can be used to merge web search results of multiple search engines. In this paper we introduce two variants of the Weighted Borda-Fuse algorithm. The first variant retrieves documents based on popularities of component engines. The second one is based on k user-defined toplist of component engines. In this research, experiments were performed on k={50,100,200} toplist with AND/OR combinations implemented on ‘UNIB Meta Fusion’ meta-search engine prototype which employed 3 out of 5 popular search engines. Both of our two algorithms outperformed other rank fusion algorithms (relevance score is upto 0.76 compare to Google that is 0.27, at P@10). The pseudo-relevance automatic judgement techniques involved are Reciprocal Rank, Borda Count, and Condorcet. The optimal setting was reached for queries with operator "AND" (degree 1) or "AND ... AND" (degree 2) with k=200. The ‘UNIB Meta Fusion’ meta-search engine system was built correctly.
Volume: 13
Issue: 4
Page: 1495-1504
Publish at: 2015-12-01

Design and Implementation of A Monitoring System for Geological Archives

10.12928/telkomnika.v13i4.1357
Sun; Hainan Vocational College of Political Science and Law Min
A monitoring system for geological archives with TCP/IP network communication is designed in this research to address wide distribution range, long distance, slow data updating, and difficult maintenance of city and county geological archives. The designed system uses the single chip STC11F32XE and the Ethernet control chip RTL8019AS as a hardware platform. The hardware design scheme, software design method, and the main programming flowchart of the geological archive monitoring unit were presented, and a specific data test was carried out. This monitoring system not only monitors and controls temperature, humidity, ponding, power supply, and other environmental data in geological archives, but also realizes geological data transmission between city (county) and provincial geological archives. In addition, this system is designed with a GSM warning mechanism, which could accelerate the quick response mechanism of the system. The entire monitoring system is accessed through the provincial environmental resources website with a fixed IP address. To ensure standardization of the monitoring system, the data transmission standard of the application layer used the associated standards of the Ministry of National Land and Resources. The entire system design improves the storage environment of the geological data effectively. It provides important data support to solve inconsistencies between provincial and city (county) geological data, as well as ensures scientific management of geological issues.
Volume: 13
Issue: 4
Page: 1437-1445
Publish at: 2015-12-01

Prototyping a Dedicated Photovoltaic System Datalogger

10.11591/ijeecs.v16.i3.pp488-494
Benabed Khadidja , Boudghene Stambouli Amine , Benabadji Noureddine
Solar power is a renewable energy seen as one of the primary sources for electricity production in order to meet our daily needs. The conversion operation is sensitive and non-fault tolerant that can occur during operation of the system that affects its overall performance. We propose in this present paper a compact, low power and low-cost datalogger for the control and the monitoring based on a survey measures of five important physical parameters in the management and monitoring of the functioning of an electric system based on solar panels. These measures will be carried out at regular intervals, configurable through a PIC18F4520 microcontroller and stored in a large capacity memory type SD card.
Volume: 16
Issue: 3
Page: 488-494
Publish at: 2015-12-01

A Polynomial-based Pairwise Key Pre-distribution and Node Authentication Protocol for Wireless Sensor Networks

10.12928/telkomnika.v13i4.3122
Fatemeh; Ferdowsi University of Mashhad Banaie , Seyed Amin; Ferdowsi University of Mashhad Hosseini Seno , Ismat; Al Baha University Aldmour , Rahmat; Al Baha University Budiarto
Continuous advances in the areas of sensor networks have made wireless sensor networks (WSNs) attractive for wide variety of applications, with vastly varying requirements and characteristics. As data sensed by nodes usually contains sensitive information, adherence to data protection requirements is vital in WSNs. This paper introduces a new robust key pre-distribution key management scheme using random polynomial functions and a matrix. The proposed mechanism significantly increases storage efficiency and enhances network resilience against node capture. The effectiveness of the mechanism is demonstrated by security analysis and a comparison to existing schemes.
Volume: 13
Issue: 4
Page: 1113-1120
Publish at: 2015-12-01
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