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25,002 Article Results

A REAL-TIME LICENSE PLATE DETECTION SYSTEM FOR PARKING ACCESS

10.12928/telkomnika.v8i2.610
Fajar Astuti; University of 17 Agustus 1945 of Surabaya Hermawati , Roenadi; University of 17 Agustus 1945 of Surabaya Koesdijarto
The automatic and real-time license plate detection system can be used as an access control entry of vehicles into the parking area. The problem is how to recognize the vehicles that will go into the parking lot and how to recognize various types of license plates in various light conditions quickly and accurately. In this research, the prototype was developed with a detection system to recognize the vehicles that will enter the parking area, and a license plate recognition system. In the license plate recognition system, the Fourier transform and Hidden Markov model method have proposed to detect location of license plate and as  characters segmentation to recognize Indonesia license plates. The research results have shown that the developed prototipe system has successfully recognized all Indonesia license plates in several of light condition and camera position. The percentage of plate recognition in the real-time experiment is 84.38%, and the average execution time for all recognition process is 5.834 second.
Volume: 8
Issue: 2
Page: 97-106
Publish at: 2010-08-01

A UNIFIED ENERGY APPROACH FOR B-SPLINE SNAKE IN MEDICAL IMAGE SEGMENTATION

10.12928/telkomnika.v8i2.619
Agung; Indonesia Islamic University Alfiansyah
 The parametric snake is one of the preferred approaches in feature extraction from images because of their simplicity and efficiency. However the method has also limitations. In this paper an explicit snake that represented using BSpline applied for image segmentation is considered. In this paper, we identify some of these problems and propose efficient solutions to get around them. The proposed method is inspired by classical snake from Kass with some adaption for parametric curve. The paper also proposes new definitions of energy terms in the model to bring the snake performance more robust and efficient for image segmentation. This energy term unify the edge based and region based energy derived from the image data. The main objective of developed work is to develop an automatic method to segment the anatomical organs from medical images which is very hard and tedious to be performed manually. After this segmentation, the anatomical object can be further measured and analyzed to diagnose the anomaly in that organ. The results have shown that the proposed method has been proven qualitatively successful in segmenting different types of medical images. 
Volume: 8
Issue: 2
Page: 175-186
Publish at: 2010-08-01

SEBUAH ALGORITMA POHON KEPUTUSAN UNTUK KLASIFIKASI CITRA SATELIT AQUA MODIS

10.12928/telkomnika.v8i2.614
Rina Luciane; Politeknik Negeri Ambon Manuhutu , Riana Debora; Politeknik Negeri Ambon Hutagalung
The satellite image processing for the environmental eksploration requires data accuracy which implied in every pixel of image so that required an appropriate technique of classification. The suitable classification is decition tree classification technique. Research about decition tree classification for classification data of satellite image have done and also research about Aqua MODIS satellite image processing for environmental exploration, but the decition tree classification technique is not developed yet for the classification of Aqua MODIS satellite data image. In this research, an algorithm decition tree classification method for data processing of Aqua MODIS satellite image to determine sea surface temperature classification is developed. A case study conducted at territorial Moluccas waters. The result of this research show that mean of accuration data classification of sea surface temperature is 97.6%
Volume: 8
Issue: 2
Page: 131-136
Publish at: 2010-08-01

ENHANCED NEURO-FUZZY ARCHITECTURE FOR ELECTRICAL LOAD FORECASTING

10.12928/telkomnika.v8i2.609
Hany; Petra Christian University Ferdinandoa , Felix; Petra Christian University Pasila , Henry; Petra Christian University Kuswanto
Previous researches about electrical load time series data forecasting showed that the result was not satisfying. This paper elaborates the enhanced neuro-fuzzy architecture for the same application. The system uses Gaussian membership function (GMF) for Takagi-Sugeno fuzzy logic system. The training algorithm is Levenberg-Marquardt algorithm to adjust the parameters in order to get better forecasting system than the previous researches. The electrical load was taken from East Java-Bali from September 2005 to August 2007. The architecture uses 4 inputs, 3 outputs with 5 GMFs. The system uses the following parameters: momentum=0.005, gamma=0.0005 and wildness factor=1.001. The MSE for short term forecasting for January to March 2007 is 0.0010, but the long term forecasting for June to August 2007 has MSE 0.0011. 
Volume: 8
Issue: 2
Page: 87-96
Publish at: 2010-08-01

A FUZZY LOGIC CLASSIFICATION OF INCOMING PACKET FOR VOIP

10.12928/telkomnika.v8i2.618
Suardinata; Universiti Teknologi Malaysia, STMIK Indonesia Padang Suardinata , Kamalrulnizam Bin Abu; STMIK Indonesia Padang Bakar
The Voice over Internet Protocol (VoIP) technology is cheaper and does not need new infrastructure because it has availables in the global computer (IP) network. Unfortunately, transition from PSTN to VoIP networks have emerged new problems in voice quality. Furthermore, the transmission of voice over IP networks can generate network congestion due to weak supervision of the traffic incoming packet, queuing and scheduling. This congestion affects the Quality of Service (QoS) such as delay, packet drop and packet loss. Packet delay effects will affect the other QoS such as: unstable voice packet delivery, packet jitter, packet loss and echo. Priority Queuing (PQ) algorithm is a popular technique used in the VoIP network to reduce delays. But, the method can result in repetition. This recursive leads to the next queue starved. To solving problems, there are three phases namely queuing, classifying and scheduling. It will be applied to the fuzzy inference system to classify the queuing incoming packet (voice, video and text). To justify the research of the improved PQ algorithm be compared against the algorithm existing.
Volume: 8
Issue: 2
Page: 165-174
Publish at: 2010-08-01

IMPROVED VOLTAGE OF CASCADED INVERTERS USING SINE QUANTIZATION PROGRESSION

10.12928/telkomnika.v8i2.613
Bambang; Universitas Jember Sujanarko , Mochamad; Institut Teknologi Sepuluh Nopember (ITS) Surabaya Ashari , Mauridhi Hery; Institut Teknologi Sepuluh Nopember (ITS) Surabaya Purnomo
The previous methods of cascaded multilevel inverter (CMLI) can improve power quality but the methods have low voltage output if the DC voltages limited by the voltage rating of power semiconductor. To improve the amplitude of CMLI output voltage, this paper proposes a new DC voltage progression. The progression based on sine quantization method (SQM), which determines a sequence of DC voltages from discrete amplitudes of sine wave function. The method also collaborates with step equal residual area method (SERAM) to minimized total harmonics distortions (THD). A single-phase CMLI that consist four H-Bridges simulated and implemented to verify the methods. Amplitude output voltage and THD results of simulations and experiments indicate that the sine quantization progression produce the highest output voltage than other DC voltage progressions, with power quality or THD in the accepted region. The amplitude of output voltage have linier function with amplitude equal 0.6665 times of H-Bridges numbers and have exponential function of THD with value below 5%.
Volume: 8
Issue: 2
Page: 123-130
Publish at: 2010-08-01

SEBUAH MODEL BERBASIS PENGETAHUAN UNTUK PENGENDALIAN FORMASI SISTEM ROBOT MAJEMUK

10.12928/telkomnika.v8i2.608
Andi; Universitas Mercu Buana Adriansyah
Study of multi-robot system has been popular in recent years. This system is able to reduce processing time of some processes, the cost and complexity of the system. However, multi-robot system also has some problems. One of the problems faced by these systems is how to control robots in a certain formation when carrying out its functions. Several methods have been offered to resolve the existing problems. This study tries to offer a method to solve the problem, by modeling the multi-robot systems and implement a control system in order to maintain a specific formation. The study attempted to use a controller based on knowledge base system. Model is developed using MATLAB software and simulated to determine the performance. Several experiments are conducted to determine the movement of the robot and its ability to maintain a specific formation. From the experiments it can be said that the modeling of multiple-robot system has been reliable. In addition, formation control actions have also been running well, although there should be further development.
Volume: 8
Issue: 2
Page: 81-86
Publish at: 2010-08-01

RBFNN CONTROL OF A TWO-LINK FLEXIBLE MANIPULATOR INCORPORATING PAYLOAD

10.12928/telkomnika.v8i2.617
M. Khairudin; Universitas Negeri Yogyakarta M. Khairudin
This paper presents the dynamic modeling and control of a two-link flexible robot manipulator. A dynamic model of the system is developed using a combined Euler-Lagrange and assumed mode methods. The most problems of a two-link flexible manipulator are vibration of flexible link and unpredictable payload additional. Previous researchers have discussed control methods for this system; few presented the effect of a payload profile. The simulation in this research is performed to assess the dynamic model and system responses at the hub and end-point of both links are presented and analyzed in time domains and show the advantages using radial basis function neural network (RBFNN) controller for solving flexible link vibration, achieve high-precision position tracking, and payload effect robustness. The results achieved by the proposed controller are compared with conventional PID to substantiate and verify the advantages the proposed scheme and its promising potential in control of a two-link flexible manipulator. It is shown that smaller overshoot, quickly steady state response and tracking performance of the proposed controller is good profile and better than PID controllers.
Volume: 8
Issue: 2
Page: 157-164
Publish at: 2010-08-01

KOHONEN NEURAL NETWORK CLUSTERING FOR VOLTAGE CONTROL IN POWER SYSTEMS

10.12928/telkomnika.v8i2.612
Muhammad; Universitas Sebelas Maret Surakarta Nizam
 Clustering a power system is very useful for the purpose of voltage stability control. However, the methods have developed usually have computational inefficiency. This paper presents a new cluster bus technique using Kohonen neural network for the purpose of forming bus clusters in power systems from the voltage stability viewpoint. This cluster formation will simplify voltage control in power system. With this proposed Kohonen algorithm, a large bus system will be partitioned into a small bus groups that have a coherence V, θ, P and Q. The maximum number of area clusters will be formed need for voltage stability needed. The proposed technique was tested on IEEE 39 bus system by considering two contingency namely load increased and line outage by using voltage collapse analysis. This formation will be compared with the Learning Vector Quantization (LVQ) algorithm. The results showed the proposed technique produces four clusters on contingency load load increased and three clusters online outage contingency on IEEE 39 bus system as shown by the LVQ.
Volume: 8
Issue: 2
Page: 115-122
Publish at: 2010-08-01

A QUANTITIES METHOD OF INDUCTION MOTOR UNDER UNBALANCED VOLTAGE CONDITIONS

10.12928/telkomnika.v8i2.607
Ayong; Tanjungpura University Hiendro
The most complete definition for the voltage unbalance is using complex voltage unbalance factor (CVUF) that consists of its magnitude and angle. Unfortunately, the definition did not distinguish between undervoltage and overvoltage unbalance conditions. In this paper, the analysis of the motor is performed using the method of symmetrical component and MATLAB software is used to investigate the performance of induction motor. The simulation results show that the International Electrotechnical Commission (IEC) definition of the voltage unbalance can be applied to evaluate total copper losses precisely. However, the phase angle of unbalance factor must be included for accurate predicting of peak currents and peak copper losses of the phase windings of the motor.The unbalanced conditions which distinguish between under and over voltage unbalance must also be taken into consideration for assessing all the quatities.  
Volume: 8
Issue: 2
Page: 73-80
Publish at: 2010-08-01

SISTEM PENERJEMAH INGGRIS-INDONESIA PADA APLIKASI CHATTING BERBASIS WEB MENGGUNAKAN PENDEKATAN ATURAN

10.12928/telkomnika.v8i2.616
Muhammad; Akademik Teknik Pembangunan Nasional Banjarbaru Syaukani
The using of chatting application among Indonesian people continues to rise on strong demand. Unfortunately, the language problems arise when chat with strangers. This research focuses on the development of online communication system using the translator of English and Indonesian. This system is designed for communication media chat application that can translate messages sent from user to other users. This system provides an alternative solution for those who experienced difficulties in communicating with people of different languages and it was developed from previous research.  The web-based chat applications systems is developed using PHP programming language, and the translator application is developed using rule-based approach, i.e. parsing tree concept and production rules. In this researach, the testing of system is conducted by sending a message in English sentences and the received message in Indonesian sentences and vice-versa. The results show that the system has successfully sent messages from sender to recipient.
Volume: 8
Issue: 2
Page: 149-156
Publish at: 2010-08-01

PURWARUPA SISTEM DETEKSI OBJEK WAKTU-NYATA BERBASIS LAYANAN PESAN SINGKAT

10.12928/telkomnika.v8i2.611
Kartika; Universitas Ahmad Dahlan Firdausy , M. Hana Mirza; Universitas Ahmad Dahlan Kholis
The powerful algorithm to detect object movement in development of room monitoring system is very urgent. The commond algorithm needs complex computation. In this research, the prototype of real-time object detection system using simple algorithm is developed, i.e. using the determination of the max noise/pixel value and the tolerance threshold of image accurately, and then the system automatically send a SMS (short message services) to user when the object movement is detected. The developed prototype used a Logitech QuickCam webcam, a Siemens C45 mobile phone and a data cable, and the Borland Delphi 7 with additional components and Serial PortNG Tvideo as system software. The application also includes a database to store the captured images whenever object movement is detected. The test results by varying conditions of light intensities using a 5-watt light bulb, fluorescent lamp 20 and 40 watts indicate that the application is able to automatically detect the presence of moving objects with 100% success rate. The success rate is strongly influenced by the determination of the max noise/pixel value and the tolerance threshold during system configuration. This application is also capable of sending SMS automatically when the system detects a moving object with an average time of 8.35 seconds.
Volume: 8
Issue: 2
Page: 107-114
Publish at: 2010-08-01

TURTLE HEARING CAPABILITY BASED ON ABR SIGNAL ASSESMENT

10.12928/telkomnika.v8i2.620
Anton; Universitas Ahmad Dahlan, Universiti Teknologi Malaysia Yudhana , Sunardi; Universitas Ahmad Dahlan, Universiti Teknologi Malaysia Sunardi , Jafri; Universiti Teknologi Malaysia Din , Syed; TUMEC (Turtle and Marine Ecosystem Center) Rantau Abang Abdullah , Raja Bidin Raja; Marine Fishery Resources Development Hassan
Sea turtles have existed for millions of years. International Union for Conservation of Nature (IUCN) has reported that the Hawksbill Turtle (Eretmochelys imbricata) is classified as critically endangered. Turtle excluder device (TED) deployment on shrimpnet fisheries is needed for turtle conservation.TED using sound technique is challenge method in fisheries development.The knowledge on turtle hearing capability is limited. The auditory brainstem response (ABR) assessment is method to determine turtle hearing capability. Turtle hearing assessment is basis to design TED. The objective of this paper is to determine turtle hearing cability by analyze its ABR spectral.The subject is Hawksbill turtle with number 2 turtles ie: 3 and 2 years. The measurement was taken at Pusat Pengurusan Penyu (Turtle Management Centre) Padang Kemunting Masjid Tanah Melaka Malaysia. The results shows that turtle 3 years have peak power frequencies 50.78, 101.6, 152.3, 304.7, 355.5, 457, and 507.8Hz respectively whereas the spectral amplitude is ranging 0.03-32.44% spectral. Turtle 2 years has peak power at 457Hz in whole stimulus frequencies while the spectral amplitude is ranging 0.01-2.5% spectral.
Volume: 8
Issue: 2
Page: 187-194
Publish at: 2010-08-01

A MODEL VISION OF SORTING SYSTEM APPLICATION USING ROBOTIC MANIPULATOR

10.12928/telkomnika.v8i2.615
Arko; Swiss German University Djajadi , Fiona; Swiss German University Laoda , Rusman; Swiss German University Rusyadi , Tutuko; Swiss German University Prajogo , Maralo; Swiss German University Sinaga
Image processing in today’s world grabs massive attentions as it leads to possibilities of broaden application in many fields of high technology. The real challenge is how to improve existing sorting system in the Moduler Processing System (MPS) laboratirium which consists of four integrated stations of distribution, testing, processing and handling with a new image processing feature. Existing sorting method uses a set of inductive, capacitive and optical sensors do differentiate object color. This paper presents a mechatronics color sorting system solution with the application of image processing. Supported by OpenCV, image processing procedure senses the circular objects in an image captured in realtime by a webcam and then extracts color and position information out of it. This information is passed as a sequence of sorting commands to the manipulator (Mitsubishi Movemaster RV-M1) that does pick-and-place mechanism. Extensive testing proves that this color based object sorting system works 100% accurate under ideal condition in term of adequate illumination, circular objects’ shape and color. The circular objects tested for sorting are silver, red and black. For non-ideal condition, such as unspecified color the accuracy reduces to 80%. 
Volume: 8
Issue: 2
Page: 137-148
Publish at: 2010-08-01

TATA KELOLA DATABASE PERGURUAN TINGGI YANG OPTIMAL DENGAN DATA WAREHOUSE

10.12928/telkomnika.v8i1.601
Spits; Universitas Budi Luhur Warnars
The emergence of new higher education institutions has created the competition in higher education market, and data warehouse can be used as an effective technology tools for increasing competitiveness in the higher education market. Data warehouse produce reliable reports for the institution’s high-level management in short time for faster and better decision making, not only on increasing the admission number of students, but also on the possibility to find extraordinary, unconventional funds for the institution. Efficiency comparison was based on length and amount of processed records, total processed byte, amount of processed tables, time to run query and produced record on OLTP database and data warehouse. Efficiency percentages was measured by the formula for percentage increasing and the average efficiency percentage of 461.801,04% shows that using data warehouse is more powerful and efficient rather than using OLTP database. Data warehouse was modeled based on hypercube which is created by limited high demand reports which usually used by high level management. In every table of fact and dimension fields will be inserted which represent the loading constructive merge where the ETL (Extraction, Transformation and Loading) process is run based on the old and new files. 
Volume: 8
Issue: 1
Page: 25-35
Publish at: 2010-04-01
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