Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

23,540 Article Results

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

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
1 2 3
...
1569 1570
Show 1560 of 1570

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration