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25,002 Article Results

Design of Lighting System for Surface Mine Projects

10.12928/telkomnika.v10i2.782
Mangalpady; National Institute of Technology Karnataka Aruna , Sunil M; Govt. Polytechnic Bicholim Jaralikar
 Indian mining illumination standard is based on incident light without mentioning about uniformity ratio, but International Commission on Illumination (CIE), Austria insists uniformity ratio. In a mine with low surface reflectance, the surrounding illumination level is lower than the minimum lighting standard as specified by various regulatory bodies. The surface brightness further reduces in wet surface condition, and results in poor visibility. In the present study, design was made both in mineral and overburden benches based on the minimum acceptable reflected light and the reflected uniformity ratio. For the purpose of comparison of various types of lighting systems, a stretch of 1.0 km long haul road was considered. The design was attempted with five different types of luminaries. Lamp mounting heights were varied at five steps, namely 8, 10, 12, 14 and 16 m. Design under wet condition incurs an excess cost 9.4 % for mineral bench and 50 % for overburden bench haul roads. Designing under wet surface condition ensures the minimum light level even under the worst condition of surface reflectivity, with marginal increase in cost.
Volume: 10
Issue: 2
Page: 235-244
Publish at: 2012-06-01

Limitation of Small-world Topology for Application in Non-dominated Sorting Differential Evolution

10.12928/telkomnika.v10i2.816
Jun-fang Li; University of Science and Technology Jun-fang Li , Bu-han; University of Science and Technology Zhang
 In the context of complex network theory, the small-world network is famous for the small-world phenomenon, namely six degrees of separation. Different from its wide application in the social, physical and technological network analysis, it can be combined with the mathematical optimization algorithm recently. In this paper, the limitation of small-world network topology for application in multi-objective optimization algorithm is proposed. The optimization algorithm based on small-world network topology may be suitable for solving a few single-objective optimization problems, but has limitation and unobvious effectiveness to deal with many multi-objective optimization problems. This paper takes non-dominated sorting differential evolution algorithm (NSDE) based on small-world topology to solve eight multi-objective optimization problems (MOPs) for example. Compared with early NSDE algorithm, the limitation of the efficiency of small-world topology in NSDE is validated with the Matlab simulation results of eight MOEA test functions of early 2007. The results prove that small-world topology has limitation and unobvious effectiveness to improve a multi-objective optimization algorithm, not as good as to improve a single-objective optimization algorithm.
Volume: 10
Issue: 2
Page: 400-408
Publish at: 2012-06-01

Personal Identification Using Ear Recognition

10.12928/telkomnika.v10i2.801
Anam; National University of Sciences and Technology Tariq , M. Usman; National University of Sciences and Technology Akram
 Biometric authentication for personal identification is very popular now a days. Human ear recognition system is a new technology in this field. The change of appearance with the expression was a major problem in face biometrics but in case of ear biometrics the shape and appearance is fixed. That is why it is advantageous to use it for personal identification. In this paper, we have proposed a new approach for an automated system for human ear identification. Our proposed method consists of three stages. In the first stage, preprocessing of ear image is done for its contrast enhancement and size normalization. In the second stage, features are extracted through Haar wavelets followed by ear identification using fast normalized cross correlation in the third stage. The proposed method is applied on USTB ear image database and IIT Delhi. Experimental results show that our proposed system achieves an average accuracy of 97.2% and 95.2% on these databases respectively.
Volume: 10
Issue: 2
Page: 321-326
Publish at: 2012-06-01

Characterization of Polymeric Chemiresistors for Gas Sensor

10.12928/telkomnika.v10i2.795
Budi; Universitas Muria Kudus Gunawan , Muhammad; Institut Teknologi Sepuluh Nopember (ITS) Rivai , Hendro; Institut Teknologi Sepuluh Nopember (ITS) Juwono
Polymer is a non conductive materialthat can be conductive with carbon black filler to form polymer-carbon composite. polymer-carbon composite’s resistance changes with gas. The conductivity of polymer-carbon composite is influenced by several factors,i.e. type of gas, volume of gas, temperature and humidity.. This research characterizes the polymer-carbon composite sensor from 6 types of polymers: PEG6000, PEG20M, PEG200, PEG1540, Silicon and Squelene. The sensors are treated with Aceton, Aceton Nitril, Benzene, Etanol, Methanol, Ethyl Aceton, Chloroform, n-Hexan and Toluene. This characterization are grouped into 4 cluster according to their selectivity, sensitivity, influence of temperature and humidity. sensors are put in an isolated chamber which is connected to data acquisition with the  variations of temperature, humidity, type and volume of gas. Correspondence analysis and regression are used to process the data. Test results found that each sensor showed different sensitivity and selectivity towards particular type of gas. Resistance of sensors increases with rising temperature and humidity environment with  order 2 and order 3 polynomial equation 
Volume: 10
Issue: 2
Page: 275-280
Publish at: 2012-06-01

Compact and Wide Upper-Stopband Triple-Mode Broadband Microstrip BPF

10.12928/telkomnika.v10i2.805
Wen Chen; Nanjing University of Aeronautics and Astronautics Wen Chen , Yongjiu; Nanjing University of Aeronautics and Astronautics Zhao , ZhouxiaoJun; Nanjing University of Aeronautics and Astronautics ZhouxiaoJun
 A broadband microstrip bandpass filter (BPF) with compact size, sharp skirt and wide upper-stopband performance is proposed using the triple-mode stub-loaded resonator. The resonator can generate one odd mode and two even modes in the desired passband. Due to the main path signal counteraction, two transmission zeros Tz1, Tz2 can be created near the passband edge to achieve sharp skirt. Two transmission zeros Tz4, Tz5 are created between two harmonic frequencies hm2, hm3 by the folded open stub and the interdigital coupling feeding lines, respectively. Owing to the source-load coupling, one zero Tz3 is introduced to deepen the stopband. Meanwhile, the zero Tz1 is shifted to the lower cut-off frequency and the other three ones Tz2, Tz4, Tz5 can be slightly turned to suppress three harmonic frequencies hm1, hm2, hm3. One filter prototype with the fractional bandwidth 34% is designed, fabricated and measured.
Volume: 10
Issue: 2
Page: 353-358
Publish at: 2012-06-01

Overcoming Challenges of Renewable Energy on Future Smart Grid

10.12928/telkomnika.v10i2.781
J.O. Petinrin; Universiti Teknologi Malaysia J.O. Petinrin , M. Shaaban; Universiti Teknologi Malaysia M. Shaaban
The increasing complexity of the conventional grid due to population growth, advancement in technology, and infrastructures are the factors that contribute immensely to instability, insecurity, and inefficiency of the use of electrical energy. To overcome the problems, the environmental energy sustainability calls for the use of renewable energy for sustainability of power supply. Intermittency and fluctuation of the renewable energy is a great challenge on the smart grid. This paper reveal the potential challenges of renewable energy on the smart grid and proffer solution with the application of high voltage DC (HVDC) and Flexible AC transmission system (FACTS) devices. The functions and advantages of FACTS devices are presented in this paper. Voltage control and stability control with FACTS application are also discussed because FACTS has fast controllability and capability to exchange active and reactive power independently.
Volume: 10
Issue: 2
Page: 229-234
Publish at: 2012-06-01

Genetic Optimization of Neural Networks for Person Recognition Based on the Iris

10.12928/telkomnika.v10i2.800
Patricia; Tijuana Institute of Technology Melin , Victor; Tijuana Institute of Technology Herrera , Danniela; Tijuana Institute of Technology Romero , Fevrier; Tijuana Institute of Technology Valdez , Oscar; Tijuana Institute of Technology Castillo
This paper describes the application of modular neural network architectures for person recognition using the human iris image as a biometric measure. The iris database was obtained from the Institute of Automation of the Academy of Sciences China (CASIA). We show simulation results with the modular neural network approach, its optimization using genetic algorithms, and the integration with different methods, such as: the gating network method, type-1 fuzzy integration and optimized fuzzy integration using genetic algorithms. Simulation results show a good identification rate using fuzzy integrators and the best structure found by the genetic algorithm.
Volume: 10
Issue: 2
Page: 309-320
Publish at: 2012-06-01

Developing Distributed System with Service Resource Oriented Architecture

10.12928/telkomnika.v10i2.815
Hermawan; Universitas Trunojoyo Madura Hermawan , Riyanarto; Institut Teknologi Sepuluh Nopember Sarno
 Service oriented architecture (SOA) is a design paradigm in software engineering for an enterprise scale which built in a distributed system environment. This paradigm aims at abstracting of application functionality as a service through a protocol in web service technology, namely simple object access protocol (SOAP). However, SOAP have static characteristic and oriented by the service methode, so have restrictiveness on creating and accessing for big numbers of service. For this reason, this reasearch aims at combining SOA with resource oriented architecture (ROA) that is oriented by the service resource use representational state transfer (REST) protocol in order to expand scalability of service. This combination is namely service resource oriented architecture (SROA). SROA can optimize distributing of applications and integrating of services where is implemented to develop the project management software. To realize this model, the software is developed according with framework of Agile model driven development (AMDD) to reduce complexities on the whole stage processing of software development.
Volume: 10
Issue: 2
Page: 389-399
Publish at: 2012-06-01

Computation of Electric Field and Thermal Properties of 3-Phase Cable

10.12928/telkomnika.v10i2.794
K. Rajagopala; National Institute of Technology Karnataka K. Rajagopala , K. Panduranga; National Institute of Technology Karnataka Vittal , Hemsingh; National Institute of Technology Karnataka Lunavath
In this paper the electric field distribution, potential distribution and temperature distribution in a 3-phase underground cable in common ground enclosure is analyzed and presented. Unlike 3-Phase screened cable the stress distribution in a belted cable is not radial. A 3-phase high voltage power cable buried in soil can be used to investigate its electrical and thermal properties. In the present study the voltage distribution of an underground cable of 132 kV is analyzed using FEM and its ampacity and temperature distribution is calculated by analytical method. Further their performance parameter is verified using Comsol Multiphysics software. The results obtained using comsol software is also compared with the results of CSM model which is obtained through literature review.
Volume: 10
Issue: 2
Page: 265-274
Publish at: 2012-06-01

The New Multipoint Relays Selection in OLSR using Particle Swarm Optimization

10.12928/telkomnika.v10i2.804
Reza Firsandaya; Universitas Sriwijaya Malik , Tharek Abdul; Universiti Teknologi Malaysia Rahman , Razali; Universiti Teknologi Malaysia Ngah , Siti Zaiton; Universiti Teknologi Malaysia Mohd , Hashim; Universiti Teknologi Malaysia Hashim
The standard optimized link state routing (OLSR) introduces an interesting concept, the multipoint relays (MPRs), to mitigate message overhead during the flooding process. This paper propose a new algorithm for MPRs selection to enhance the performance of OLSR using particle swarm optimization sigmoid increasing inertia weight (PSOSIIW). The sigmoid increasing inertia weight has significance improve the particle swarm optimization (PSO) in terms of simplicity and quick convergence towards optimum solution. The new fitness function of PSOSIIW, packet delay of each node and degree of willingness are introduced to support MPRs selection in OLSR. The throughput, packet loss and end-to-end delay of the proposed method are examined using network simulator 2 (ns2).  Overall results indicate that OLSR-PSOSIIW has shown good performance compared to the standard OLSR and OLSR-PSO, particularly for the throughput and end-to-end delay. Generally the proposed OLSR-PSOSIIW shows advantage of using PSO for optimizing routing paths in the MPRs selection algorithm.
Volume: 10
Issue: 2
Page: 343-352
Publish at: 2012-06-01

Relationships between Harmonic Characteristics and Different Types of Voltage Source

10.12928/telkomnika.v10i2.780
Risnidar C; Universitas Sumatera Utara, University Malaysia Perlis (UniMAP) Risnidar C , I. Daut; University Malaysia Perlis, (UniMAP) I. Daut , Syafruddin H; Universitas Sumatera Utara, University Malaysia Perlis (UniMAP) Syafruddin H , Yusniati; University of Islam Sumatera Utara Yusniati
This paper discusses about harmonic characteristics due to different types of voltage sources. Ideal voltage source is sinusoid, unfortunately in actual condition load receives voltage sources from elements which produce the non sinusoidal output voltage, and consequently, the load has non pure sinusoid waveform as an input voltage. Voltage source at power of common coupling (PCC) between transformer and linear load and nonlinear load has become an example of the case. This research has been conducted by using Schhafner Power Quality Analyzer and PM300 Power Quality Analyzer, which was focused to figure out all characteristics related to harmonics such as power, voltage, current, power factor (p.f.), Harmonic Distortion, and harmonic energy losses cost. The selected load is induction motor with Adjustable Speed Drive (ASD) because this typical load is one of electronic device that causes harmonics. The voltage sources in this research are sine wave, square wave and harmonic order combinations of 3rd, 5th and 7th which can create from Schhafner Power Quality Analyzer.
Volume: 10
Issue: 2
Page: 219-228
Publish at: 2012-06-01

Google+ vs Facebook: The Comparison

10.12928/telkomnika.v10i2.814
Kevin; University of Ulster Curran , Scott; University of Ulster Morrison , Stephen; University of Ulster Mc Cauley
Social networks are a varyingly popular tool used to connect with friends, colleagues and/or family. Recently, Facebook has been at the top of the social network food chain, with Bebo and MySpace decreasing in users and the huge increase of users joining Facebook in such a short time. Google have just recently launched Google+, a social networking site. This is not the first time that Google have attempted to break into the social networking scene but it is possible that these failed attempts may have taught them something. As Facebook’s user base is extremely diverse, spreading across different countries, races, ages, professions, and interests, to name a few, this network is a good model to compare new rival Google+ to. Google+ has set out to do the same things as Facebook but better to try and steal away some of that high power and necessity that Facebook has gained. Facebook has News feed, Google has Stream. Facebook has Lists, Google has circles. Facebook has like’s, Google has +1. Facebook accounts for 10% of overall internet usage. This paper will look at various comparables between the two social networks and analyse the better functionality, design and ease of use. It will then conclude a verdict on which is the better social network to use overall. 
Volume: 10
Issue: 2
Page: 379-388
Publish at: 2012-06-01

Numerical Analysis of the Factors about Combustion Stability on Boiler

10.12928/telkomnika.v10i2.799
Li Jun; North China Electric Power University Li Jun , Yan; North China Electric Power University Weiping , Gao; North China Electric Power University Yang
Through the research of the coal pulverized catches fire and steadily combustion mechanism, the numerical simulation of the 300MW tangentially pulverized coal fired boiler by Coal-fire software, and combine the operating data of the boiler, the corresponding relation between the result of numerical simulation and combustion stability have been established. The result indicates that the higher volatile matter, lower content of ash and moisture of the coal, it helps the coal pulverized air current to catch fire. More fineness coal pulverized is favorable to catch fire. When boiler load reduced, it will influence the characteristic"lighted by itself" of the tangentially pulverized coal fired boiler, and it will cause combustion unstably. 
Volume: 10
Issue: 2
Page: 303-308
Publish at: 2012-06-01

Optimum Reactive Power Dispatch for Alleviation of Voltage Deviations

10.12928/telkomnika.v10i2.793
Abraham; Institut Teknologi Nasional (ITN) Malang Lomi , Dhadbanjan; Indian Institute of Science Thukaram
This paper presents a non-linear optimization algorithm for alleviation of under-voltage and over-voltage conditions in the day-to-day operation of power networks. Voltage control for varying load and generation conditions can be achieved by coordinated control of switchable shunt VAR compensating (SVC) devices, on load transformer taps (OLTC) and generators excitation. The proposed algorithm for voltage control uses a non-linear least square minimization technique. Results obtained for 6-Bus Ward-Hale system and a modified IEEE 30-Bus system are presented for illustration purposes.
Volume: 10
Issue: 2
Page: 257-264
Publish at: 2012-06-01

Review of Sequential Access Method for Fingerprint Identification

10.12928/telkomnika.v10i2.803
G. Indrawan; Bandung Institute of Technology G. Indrawan , B. Sitohang; Bandung Institute of Technology B. Sitohang , S. Akbar; Bandung Institute of Technology S. Akbar
Real time fingerprint identification is usually equipped with specific computation machine architecture to optimize speed factor. Focusing on achieving better speed performance of fingerprint identification on common computation machine, a disquisition was conducted on sequential access method for fingerprint identification, with its underlying data structure designed to work with parallel processing. Hypothetically, parallel processing based on multi-cores processor technology, can give faster result without reducing accuracy. If multi core processor was detected, simultaneous processes would run on fingerprint matching-pairs to find its similarity score, respectively. Experiment confirms that speed performance of fingerprint identification using sequential access method with parallel processing outperforms the one without parallel processing. For both strategy, even though using parallel processing confirms faster result, experiment shows that searching time O(n) still linearly depends on number of fingerprints in database. Avoiding such searching time trend, hypothetically, need strategy of direct access method utilization.
Volume: 10
Issue: 2
Page: 335-342
Publish at: 2012-06-01
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