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25,002 Article Results

LAJU GALAT BIT AKIBAT KESALAHAN PENGARAHAN ANTENA STASIUN BUMI KE SATELIT

10.12928/telkomnika.v8i1.605
Wahyu; Akademi Teknik Telkom Sandhy Putra Purwokerto Pamungkas , Anggun Fitrian; Akademi Teknik Telkom Sandhy Putra Purwokerto Isnawati
One problem causing reduction of energy in satellite communications system is the misalignment of earth station antenna pointing to satellite. Error in pointing would affect the quality of information signal to energy bit in earth station. In this research, error in pointing angle occured only at receiver (Rx) antenna, while the transmitter (Tx) antennas precisely point to satellite. The research was conducted towards two satelites, namely TELKOM-1 and TELKOM-2. At first, measurement was made by directing Tx antenna precisely to satellite, resulting in an antenna pattern shown by spectrum analyzer. The output from spectrum analyzers is drawed with the right scale to describe swift of azimuth and elevation pointing angle towards satellite. Due to drifting from the precise pointing, it influenced the received link budget indicated by pattern antenna. This antenna pattern shows reduction of power level received as a result of pointing misalignment. As a conclusion, the increasing misalignment of pointing to satellite would affect in the reduction of received signal parameters link budget of downlink traffic.
Volume: 8
Issue: 1
Page: 57-64
Publish at: 2010-04-01

MODEL ARSITEKTUR BISNIS, SISTEM INFORMASI DAN TEKNOLOGI DI BAKOSURTANAL BERBASIS TOGAF

10.12928/telkomnika.v8i1.600
Iyan; Badan Koordinasi Survei dan Pemetaan Nasional (BAKOSURTANAL) Supriyana
The information technology (IT) is a necessary in BAKOSURTANAL to support business in relation with data and spatial information. Users will get the advantage through easy and fast access to data and spatial information. The important of the enterprise architecture (EA) to play a role to support company is proven because it provides technology and process structure which are fundamental aspects in IT strategy. Enterprise architecture framework (EAF) will accelerate and simplify the development of EA by ascertaining comprehensive coverage of solutions, ensuring the result of EA is always in line with the growth of enterprise. This paper  explains the open group architecture framework (TOGAF) from several of EAF. The result shows that the most suitable EAF for BAKOSURTANAL in Blueprint development is by proposing EA model that covers business, information system, and technology architecture which are relied on recommended technical basics that is possible to be implemented
Volume: 8
Issue: 1
Page: 17-24
Publish at: 2010-04-01

METODE SINKRONISASI INVERTER SATU FASE DENGAN JARINGAN LISTRIK YANG TERDISTORSI

10.12928/telkomnika.v8i1.604
Bambang; Universitas Jember Sujanarko
DC power sources from renewable energy sources that would be connected to the electricity grid system require synchronization process. This process is implemented by controlling the inverter in a way to obtain instantaneous amplitude, phase and frequency according to the electricity network. This research discussed a method for synchronizing VSI PWM inverters connected with distorted single-phase power grid using a filter as a pure sine generator, and a compensator as the restorer of angle change due to the power filtering. Results of simulation using MATLAB show that this method can produce better synchronization compared to other synchronization methods, as it successfully produce similar phase and waveform with the grid’s waveform.
Volume: 8
Issue: 1
Page: 49-56
Publish at: 2010-04-01

WEB BASED LABORATORY TASK-SUBMITTER APPLICATION MODEL

10.12928/telkomnika.v8i1.599
Soetam Rizky; Ma Chung University Indonesia Wicaksono
Teaching learning process in laboratory is obligatory in engineering education especially for course in information technology (IT).  To make laboratory activities become more interesting for the students, lecturers must build application-based exercise for the student, but after students accomplished their short exercise, it is found that lecturers got difficulty to compile and grade all the exercises. This paper is based on the idea how to overcome the problem above, in order to make activities in the laboratory comfortable for both lectures and student. It is expected that the lectures will able to fully control all practical activity and save the time automatically. To make approach to solve the problem in IT, a modeling process must be conducted first. There for, firstly, this paper explain the model approach for the problem above, then the IT design for practices in laboratory is described. The IT design to overcome the problem has been effectively applied in the real teaching learning process.
Volume: 8
Issue: 1
Page: 9-16
Publish at: 2010-04-01

MESIN PENCARI DOKUMEN DENGAN PENGKLASTERAN SECARA OTOMATIS

10.12928/telkomnika.v8i1.603
Entin; Politeknik Elektronika Negeri Surabaya-Institut Teknologi Sepuluh Nopember Martiana , Nur; Politeknik Elektronika Negeri Surabaya-Institut Teknologi Sepuluh Nopember Rosyid , Usmaida; Politeknik Elektronika Negeri Surabaya-Institut Teknologi Sepuluh Nopember Agusetia
Web mining in searching based on keywords by automatic clustering is a document searching method by classifying documents based on its keyword. Following is the clustering by centroid linkage hierarchical method (CLHM) to the number of keywords from each document. In clustering, initialization is commonly required for the number of cluster to be formed first, however, in some clustering cases, the user cannot determine how many clusters can be built. Therefore, on this paper, the Valley tracing method is applied as a constraint which identifies variants movement from each cluster formation step and also analyzes its pattern to form automatic clustering. Document data used are from text mining process on documents. Based on 424 documents, this research shows that clustering method using CLHM algorithm can be generally used to classifying documents with exact number automatically.
Volume: 8
Issue: 1
Page: 41-48
Publish at: 2010-04-01

AN OPTIMIZED SQUARE ROOT ALGORITHM FOR IMPLEMENTATION IN FPGA HARDWARE

10.12928/telkomnika.v8i1.598
Tole; Universitas Ahmad Dahlan (UAD) Sutikno
This paper presents an optimized digit-by-digit calculation method to solve complicated square root calculation in hardware, as a proposed simple algorithm for implementation in field programmable gate array (FPGA). The main principle of proposed method is two-bit shifting and subtracting-multiplexing operations, in order to achieve a simpler implementation and faster calculation. The proposed algorithm has conducted to implement FPGA based unsigned 32-bit and 64-bit binary square root successfully. The results have shown that proposed method is most efficient of hardware resource compare to other methods. In addition, the strategy can be expanded to larger number easily.
Volume: 8
Issue: 1
Page: 1-8
Publish at: 2010-04-01

KESESUAIAN METODE FUZZY AUTO-REGRESSIVE UNTUK MODEL CURAH HUJAN DI INDONESIA

10.12928/telkomnika.v8i1.602
Muhammad; Politeknik Negeri Medan Rusdi
Rain is one of the attenuation factors in very high frequency radio wave. Attenuation caused by rainfall gives a big impact in communication systems, especially wireless communication systems at millimeter-wave. This paper seeks to apply the fuzzy auto-regressive model (fuzzy AR) for rainfall in Indonesia. In this study, firstly the rainfall is measured, followed by getting the fuzzy variables for each event of rainfall measurements. Thirdly, the fuzzy variables based on the timing of the rain to get a fuzzy time series is set, and fourth step is the fuzzy time series modeling as a fuzzy AR(2) process. The fifth is estimating the matrix of model parameter, and the last step is simulating the generation of rainfall using fuzzy AR(2) model. The results obtained from the generation of simulated rainfall with Fuzzy AR(2) shows a good agreement with the actual measurement results.
Volume: 8
Issue: 1
Page: 35-40
Publish at: 2010-04-01

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
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