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STABILISATOR SISTEM TENAGA BERBASIS JARINGAN SYARAF TIRUAN BERULANG UNTUK SISTEM MESIN TUNGGAL

10.12928/telkomnika.v8i1.606
Widi; Universitas Negeri Surabaya Aribowo
In this paper, recurrent neural network (RNN) is used to design power system stabilizer (PSS) due to its advantage on the dependence not only on present input but also on past condition. A RNN-PSS is able to capture the dynamic response of a system without any delays caused by external feedback, primarily bythe internal feedback loop in recurrent neuron. In this paper, RNNPSS consists of a RNN-identifier and a RNN-controller. The RNN-Identifier functions as the tracker of dynamics characteristics of the plant, while the RNN-controller is used to damp the system’s low frequency oscillations. Simulation results using MATLAB demonstrate that the RNNPSS can successfully damp out oscillation and improve the performance of the system.
Volume: 8
Issue: 1
Page: 65-72
Publish at: 2010-04-01

INVESTIGATION OF SHORT CHANNEL EFFECT ON VERTICAL STRUCTURES IN NANOSCALE MOSFET

10.12928/telkomnika.v7i3.591
Munawar; Diponegoro University A. Riyadi , Ismail; Universiti Malaysia Sabah Saad , Razali; Universiti Teknologi Malaysia Ismail
The recent development of MOSFET demands innovative approach to maintain the scaling into nanoscale dimension. This paper focuses on the physical nature of vertical MOSFET in nanoscale regime. Vertical structure is one of the promising devices in further scaling, with relaxed-lithography feature in the manufacture. The comparison of vertical and lateral MOSFET performance for nanoscale channel length (Lch) is demonstrated with the help of numerical tools. The evaluation of short channel effect (SCE) parameters, i.e. threshold voltage roll-off, subthreshold swing (SS), drain induced barrier lowering (DIBL) and leakage current shows the considerable advantages as well as its thread-off in implementing the structure, in particular for nanoscale regime.
Volume: 7
Issue: 3
Page: 175-180
Publish at: 2009-12-01

SISTEM PEMANTAU RUANG JARAK JAUH DENGAN SENSOR PASSIVE INFRARED BERBASIS MIKROKONTROLER AT89S52

10.12928/telkomnika.v7i3.595
Albert; Universitas Budi Luhur Gifson , Slamet; Pusat Penelitian dan Pengembangan Teknologi Ketenagalistrikan dan Energi Baru Terbarukan Slamet
This research describes about the design of the room detection system using a Passive Infrared sensors (PIR) controlled by Microcontroller AT89S52 for remote control application. The output of the PIR is a low logic when it captures the heat waves of the human body. The output PIR is connected to the port 1.7 on Microcontroller in high logic. The maximum distance is 5 meters for the sensor to detect an object. When there is a signal sent by PIR, the Microcontroller processes the data and activates the buzzer to beep and the stepper motor to stop. Microcontroller also sends data through the RS-232 that continues a signal to the personal mobile phone.  In order that the message is able to be sent, then first, messages must be programmed and stored in the Microcontroller AT89S52. The average message delivery time is 8.8 seconds. The recipient can turn the alarm of system on or off by a missed call.
Volume: 7
Issue: 3
Page: 201-106
Publish at: 2009-12-01

MODULAR NETWORK SOM (MNSOM): A NEW POWERFUL TOOL IN NEURAL NETWORKS

10.12928/telkomnika.v7i3.590
Muhammad Aziz; Brawijaya University Muslim
In this paper, a new powerful method in artificial neural networks, called modular network SOM (mnSOM) is introduced. mnSOM is a generalization of  Self Organizing Maps (SOM) formed by replacing each vector unit of SOM with function module. The modular function could be a multi layer perceptron, a recurrent neural network or even SOM itself. Having this flexibility, mnSOM becomes a new powerful tool in artificial neural network.
Volume: 7
Issue: 3
Page: 169-174
Publish at: 2009-12-01

PENERAPAN JARINGAN SYARAF TIRUAN UNTUK MENGUKUR TINGKAT KORELASI ANTARA NEM DENGAN IPK KELULUSAN MAHASISWA

10.12928/telkomnika.v7i3.594
Yeni; Universitas Paramadina Nuraeni
Currently, the Informatics Engineering undergraduate program of University of X (PSTI-X) uses the SLTA's EBTANAS Score (NEM) for admission selection criteria, especially for those coming who apply through fellowships. Due to the fact that the high score of NEM does not guarantee a graduate with high academic achievement, thus this study is intended to test the correlation between the composition of the high school's NEM with the grade point average of PSTI-X graduate using artificial neural network with feed-forward back propagation approach (JST-PB). It is expected to be used as a guideline for determining the composition of the SLTA's NEM score in the selection of new admissions, particularly via the fellowship. The results showed that JST-PB only has 64% success rate in the mapping of NEM composition and academic achievement of graduates. These results reinforce the results of previous studies using correlation analysis and multiple linear regressions that NEM could not be used as an absolute reference in the new admission selection system. The result of this study provides recommendations that PSTI-X needs to review new admissions system, particularly those through the fellowship.
Volume: 7
Issue: 3
Page: 195-200
Publish at: 2009-12-01

HARDWARE-RESOURCE SAVING FOR REALIZATION OF SPACE VECTOR PWM BASED ON FPGA USING BUS-CLAMPING TECHNIQUE

10.12928/telkomnika.v7i3.589
Tole; Universitas Ahmad Dahlan (UAD) Sutikno
The space vector pulse width modulation (SV-PWM) is more suitable and can increase the obtainable DC voltage utilization ratio very much compared to others PWM. Moreover, the modulation can obtain a better voltage total harmonic distortion (THD) factor. But until now, no studies that concern at hardware resources saving to realize SV-PWM based on FPGA. This paper proposes a new technique to realize SV-PWM based on FPGA. In order to get hardware resource saving, a simple technique to judge sectors, to calculate the firing pulses and to generate SV-PWM waveform without calculation of trigonometric function using bus-clamping technique is proposed. The technique has been implemented successfully based on APEX20KE FPGA to drive three phase induction machine 1.5 kW with low ripples in current and voltage, and has been shown that the proposed SVM method required the most minimum hardware resources compared to others research. 
Volume: 7
Issue: 3
Page: 161-168
Publish at: 2009-12-01

SISTEM PAKAR DIAGNOSA PENYAKIT TANAMAN PADI BERBASIS WEB DENGAN FORWARD DAN BACKWARD CHAINING

10.12928/telkomnika.v7i3.593
Anton Setiawan; Sekolah Tinggi Teknologi Adisutjipto Honggowibowo
Rice plants can be attacked by various kinds of diseases which are possible to be determined from their symptoms. However, it is to recognize that to find out the exact type of disease, an agricultural expert’s opinion is needed, meanwhile the numbers of agricultural experts are limited and there are too many problems to be solved at the same time. This makes a system with a capability as an expert is required. This system must contain the knowledge of the diseases and symptom of rice plants as an agricultural expert has to have.  This research designs a web-based expert system using rule-based reasoning.  The rule are modified from the method of forward chaining inference and backward chaining in order to to help farmers in the rice plant disease diagnosis. The web-based rice plants disease diagnosis expert system has the advantages to access and use easily. With web-based features inside, it is expected that the farmer can accesse the expert system everywhere to overcome the problem to diagnose rice diseases.
Volume: 7
Issue: 3
Page: 187-194
Publish at: 2009-12-01

PENERAPAN MULTI-MIKROKONTROLER PADA MODEL ROBOT MOBIL BERBASIS LOGIKA FUZI

10.12928/telkomnika.v7i3.597
Nuryono Satya; Universitas Ahmad Dahlan Widodo
This paper proposed a fuzzy logic based mobile robot as implemented in a multimicrocontroller system. Fuzzy logic controller was developed based on a behavior based approach. The Controller inputs were obtained from seven sonar sensor and three tactile switches. Behavior based approach was implemented in different level priority of behaviors. The behaviors were: obstacle avoidance, wall following and escaping as the emergency behavior. The results show that robot was able to navigate autonomously and avoid the entire obstacle.
Volume: 7
Issue: 3
Page: 213-218
Publish at: 2009-12-01

ANALYSIS, DESIGN AND IMPLEMENTATION OF AN EMBEDDED REALTIME SOUND SOURCE LOCALIZATION SYSTEM BASED ON BEAMFORMING THEORY

10.12928/telkomnika.v7i3.588
Arko; Swiss German University Djajadi , Rusman; Swiss German University Rusyadi , Tommy; Swiss German University Handoko , Maralo; Swiss German University Sinaga , Jürgen; Swiss German University Grueneberg
This project is intended to analyze, design and implement a realtime sound source localization system by using a mobile robot as the media. The implementated system uses 2 microphones as the sensors, Arduino Duemilanove microcontroller system with ATMega328p as the microprocessor, two permanent magnet DC motors as the actuators for the mobile robot and a servo motor as the actuator to rotate the webcam directing to the location of the sound source, and a laptop/PC as the simulation and display media. In order to achieve the objective of finding the position of a specific sound source, beamforming theory is applied to the system. Once the location of the sound source is detected and determined, the choice is either the mobile robot will adjust its position according to the direction of the sound source or only webcam will rotate in the direction of the incoming sound simulating the use of this system in a video conference. The integrated system has been tested and the results show the system could localize in realtime a sound source placed randomly on a half circle area (0 - 1800) with a radius of 0.3m - 3m, assuming the system is the center point of the circle. Due to low ADC and processor speed, achievable best angular resolution is still limited to 25o.
Volume: 7
Issue: 3
Page: 151-160
Publish at: 2009-12-01

PERANCANGAN SISTEM MONITORING ONLINE PADA PASIEN PENDERITA JANTUNG KORONER BERBASIS IDENTIFIKASI SINYAL ELEVASI ST

10.12928/telkomnika.v7i3.592
Ratna; Institut Teknologi Sepuluh Nopember Adil
The coronary heart disease is one of desease leading to the sudden death. This is the reason why online  monitoring system is urgently needed to monitor the patients with coronary heart disease. This paper proposse the system with an algorithm which is developed from signal identification of ST elevation. The medical record in this system is measured by a new wireless ECG development and followed Zigbee standard. If the system detects the possibility of disturbance in cardiac function, then soon, an alarm signal is send to the server at the hospital, in order that an intensive first aid can be given immediately. Based on the testing results, the level of success of an online monitoring system is possible to reach 100% if the patient does not make any moving around. It is expected that the application of this system will reduce the sudden death for patients at hospital with coronary heart disease.
Volume: 7
Issue: 3
Page: 181-186
Publish at: 2009-12-01

DEVELOPMENT OF A CURRENT CONTROL ULTRACAPACITOR CHARGER BASED ON DIGITAL SIGNAL PROCESSING

10.12928/telkomnika.v7i3.587
Ahmad Saudi; Universitas Lampung Samosir
Ultracapacitor usually use as a short-term duration electrical energy storage because it has several advantages, like high power density (5kW/kg), long lifecycle and very good charge/discharge efficiency. Unlike batteries, ultracapacitors may be charged and discharged at similar rates. This is very useful in energy recovery systems such as dynamic braking of transport systems.  Here are a few characteristics of ultracapacitors that should be kept in mind when integrating/designing a charging system for the intended application. An ultracapacitor with zero charge looks like a short circuit to the charging source. Most of low cost power supplies fold back the output current in response to a perceived short circuit, making them unsuitable for charging of ultracapacitors. Ultracapacitors have a low series inductance allowing easy stabilizing with switch mode chargers. The RC time constant of passive charging networks is usually too long. Therefore, linear regulators are inefficient components for ultracapacitor charging. In this paper, the development of a current control ultracapacitor charger based on Digital Signal Processing (DSP) is presented. 
Volume: 7
Issue: 3
Page: 145-150
Publish at: 2009-12-01

PURWARUPA ROBOT PEMADAM API DENGAN SENSOR ULTRASONIC DAN ULTRAVIOLET BERBASIS AT89S52

10.12928/telkomnika.v7i3.596
Wahyu Sapto; Universitas Ahmad Dahlan Aji , Fajar; Universitas Ahmad Dahlan Hermawanto , Muchlas; Universitas Ahmad Dahlan Muchlas
The fire often takes many victims. Fire detection system sometime can not prevent this from happening. Therefore, it is essential to develop a robot that can detect the present of fire as well as extinguish it. This research aimed to design a fire extinguisher robot using AT89S52 microcontroller as its controller. A DC fan controlled by a relay is utilized to put out the fire and a fire sensor (UV-Tron) is used to detect the presence of fire. The movement of the robot is driven by motor DC. The robot can detect the surrounding obstacles and possess an ultrasound-based navigation system. If the ultrasound system detects an obstacle, the robot will automatically turn without colliding the obstacle or other things around it. The result has shown that this fire extinguisher robot can be built using hardware and software controlled by an AT89S52 microcontroller. It can be concluded from the tests that the robot can detect fire as far as 5 meter distance and able to successfully put out the fire.
Volume: 7
Issue: 3
Page: 207-212
Publish at: 2009-12-01

PENCARIAN JALUR ALTERNATIF PADA DAERAH BENCANA LUMPUR SIDOARJO DENGAN METODE ANALYTIC HIERARCHY PROCESS BERBASIS WAP

10.12928/telkomnika.v7i2.586
Arna; Politeknik Elektronika Negeri Surabaya Fariza , Afrida; Politeknik Elektronika Negeri Surabaya Helen , Ardinur; Politeknik Elektronika Negeri Surabaya Mahyuzar
In line with the increasing interest on Lapindo mud disaster which causes several roadway covered by mud, there is a need to give an alternative solution for traffic transportation problem in surrounding area. The possible criteria for the solution of this road way are length, surface, traffic, and width of the road. Types of vehicle across the road also give a contribution to the criteria. By using Geography Information System (GIS), it is easy to all drivers to take decision which way has to be chosen based on the real condition. GIS is used to visualize the alternative road, which is possible to take. Analytic Hierarchy Processing (AHP) is a decision method which is based on many criteria and alternatives. The input of AHP can be a preference or real value. Applied AHP to decide value of each alternative is based on application of Wireless Application Protocol (WAP) assessment.
Volume: 7
Issue: 2
Page: 137-144
Publish at: 2009-08-01

KOMBINASI FEED BACK DAN FEED FORWARD KONTROLLER PI SEBAGAI KENDALI DYNAMIC VOLTAGE RESTORER (DVR) UNTUK MEMULIHKAN VOLTAGE SAG DAN INTERRUPTION

10.12928/telkomnika.v7i2.581
Dimas; Institut Teknologi Sepuluh Nopember Anton A , Imron; Institut Teknologi Sepuluh Nopember Rosyadi , Mochamad; Institut Teknologi Sepuluh Nopember Ashari , Heri; Institut Teknologi Sepuluh Nopember Suryoatmojo
Dynamic voltage restorer (DVR) is one of equipments to protect sensitive load from voltage drop. DVR is installed series with line feeder by serial transformer which injecting voltage when under voltage occurs. This research is investigate the capability of DVR, which controlled by combination of feed back and feed forward PI, to handle voltage sag and interruption. DVR controls have been designed and implemented in DVR prototype. As a result, in simulation, DVR can maintain voltage in range 90% - 105% nominal voltage. Voltage at load side can be restored to 1 pu and 0.79 pu when voltage sag and interruption respectively. Furthermore, DVR prototype can restore 0.95 pu when voltage sag and 0.54 pu when interruption.
Volume: 7
Issue: 2
Page: 93-102
Publish at: 2009-08-01

SIMULASI PERHITUNGAN HIGH POWER AMPLIFIER PADA SISTEM VSAT

10.12928/telkomnika.v7i2.585
Indri; Politeknik Negeri Jakarta Neforawati , Hoga; University of 17 Agustus 1945 Jakarta Saragih
Arithmatical simulation of High Power Amplifier (HPA) on VSAT system is a program which used  to calculate the capacity of HPA as a working test of maximum power on each remote station of the VSAT network system, afterward  can be obtained the available  capacity value and power capacity used, therefore  able to reallocate residual power below its available power spare. VSAT system can be used for several telecommunication application such as video broadcast, data broadcast,audio broadcast, banking operation, ATM and others. Due to the easy operational, maintanance and its instalment, VSAT system is more prifitable compare to ordinary terestrial band, its capability for  multiservice application become more  flexible in using  its network. The software used is Visual Basic 6.0 version and database Microsoft Access. These software take a role as visualization and planning for remote station development and also power capasity needed for each remote in the calculation of HPA. 
Volume: 7
Issue: 2
Page: 129-136
Publish at: 2009-08-01
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