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29,758 Article Results

Performance Evaluation of Centralized Reconfigurable Transmitting Power Scheme in Wireless Network-on-chip

10.12928/telkomnika.v16i6.9306
M. S.; Universiti Teknologi Malaysia Rusli , A. A. H.; Universiti Teknologi Malaysia Ab Rahman , U. U.; Universiti Teknologi Malaysia Sheikh , N. Shaikh; Universiti Teknologi Malaysia Husin , Michael L. P.; Universiti Teknologi Malaysia Tan , T.; Universitas Diponegoro Andromeda , M. N.; Universiti Teknologi Malaysia Marsono
Network-on-chip (NoC) is an on-chip communication network that allows parallel communication among all cores to improve inter-core performance. Wireless NoC (WiNoC) introduces long-range and high bandwidth radio frequency (RF) interconnects that can possibly reduce the multi-hop communication of the planar metal interconnects in conventional NoC platforms. In WiNoC, RF transceivers account for a significant power consumption, particularly its transmitter, out of its total communication energy. This paper evaluates the energy and latency performance of a closed loop power management mechanism which enables transmitting power reconfiguration in WiNoC based on number of erroneous received packets. The scheme achieves significant energy savings with limited performance degradation and insignificant impact on throughput.
Volume: 16
Issue: 6
Page: 2844-2854
Publish at: 2018-12-01

Accelerating Compression Time of the standard JPEG by Employing The Quantized YCbCr Color Space Algorithm

10.11591/ijece.v8i6.pp4343-4351
Trini Saptariani , Sarifudin Madenda , Ernastuti Ernastuti , Widya Silfianti
In this paper, we propose a quantized YCbCr color space (QYCbCr) technique which is employed in standard JPEG. The objective of this work is to accelerate computational time of the standard JPEG image compression algorithm. This is a development of the standard JPEG which is named QYCBCr algorithm. It merges two processes i.e., YCbCr color space conversion and Q quantization in which in the standar JPEG they were performed separately. The merger forms a new single integrated process of color conversion which is employed prior to DCT process by subsequently eliminating the quantization process. The equation formula of QYCbCr color coversion is built based on the chrominance and luminance properties of the human visual system which derived from quatization matrices. Experiment results performed on images of different sizes show that the computational running time of QYCbCr algorithm gives 4 up to 8 times faster than JPEG standard, and also provides higher compression ratio and better image quality.
Volume: 8
Issue: 6
Page: 4343-4351
Publish at: 2018-12-01

Performance Evaluation of Low-Cost GPS Time Server Based on NTP

10.12928/telkomnika.v16i6.10198
Heri; Maranatha Christian University Andrianto , Yohana; Maranatha Christian University Susanthi , Denny; Maranatha Christian University Suryadi
Time synchronization is required to maintain a precise clock. In this paper, a low-cost GPS NTP server has been realized using inexpensive arduino, GPS receiver, and ethernet shield. The performance of low cost GPS NTP server has been compared with the performance of commercial GPS NTP server (TM1000A). The results showed that both time server has synchronization success rate of 100% with average clock offset -8,69 ms for low cost GPS NTP server and -10,1538 ms for TM1000A.  However, TM1000A have better clock offset deviation area compared with low cost GPS NTP server. TM1000A has a smaller clock offset deviation area, which is between -8 ms to -12 ms while low cost GPS NTP server has larger clock offset deviation area, which is between -20 ms to +10 ms. With production costs of less than 29 USD, we offer cheap GPS NTP servers as an alternative GPS NTP server for time synchronization on computer networks.
Volume: 16
Issue: 6
Page: 2528-2535
Publish at: 2018-12-01

A Review on Registration of Medical Images Using Graph Theoretic Approaches

10.11591/ijeecs.v12.i3.pp974-983
Akshaya R , Hema P Menon
Image registration is very essential for image analysis especially in the medical field. The registered image helps us to find a lot of things like the presence of a tumor, aneurysm, and many more. Image registration is a process of aligning two images that were captured during different conditions that makes analyzing of images possible. There are various methods in which images can be registered. This paper mainly discusses the methods that use the graph approach to register the medical images. The main focus is on rigid and non-rigid registration techniques and gives a brief description of the methods present.
Volume: 12
Issue: 3
Page: 974-983
Publish at: 2018-12-01

Design of Quasi-Elliptic Bandpass Filter for Substrate Integrated Waveguide (SIW) Using Cross Coupling Technique

10.11591/ijeecs.v12.i3.pp1366-1372
Muhajir Mustapa , ZahrilAdha Zakaria , Noor Azwan Shairi
This paper proposes a quasi-elliptic band pass filter in substrate integrated waveguide (SIW) by using cross coupling technique to produce transmission zeros (TZs) at both side. Finally, a fourth pole SIW quasi-elliptic filter at 5.75 GHz is designed in single layer substrate. Simulation results show that the filter has a center frequency of 5.75 GHz with the bandwidth of 100 MHz. The minimum insertion loss in the passband is 0.3 dB, and the return loss is better than 20 dB. Due to the TZs, the SIW filter has rapid transition performance at both lower and upper sidebands, good selectivity is achieved, while the SIW filter presents a very compact implementation and goodspurious rejection.
Volume: 12
Issue: 3
Page: 1366-1372
Publish at: 2018-12-01

A New Framework for Information System Development on Instant Messaging for Low Cost Solution

10.12928/telkomnika.v16i6.8614
I Made; Udayana University Sukarsa , I Ketut Gede Darma; Udayana University Putra , Nyoman Putra; Udayana University Sastra , Lie; Udayana University Jasa
The increasingly inexpensive Internet has spurred the growth of online information system services in various companies. Almost all services are available in forms on web or mobile applications. For small companies, this particular system is more difficult to implement as it requires a substantial cost allocated for hosting, domain and server devices. The solution is to develop a framework for building information system services through Instant Messaging (IM) such as Telegram, Line or XMPP / Jabber using the Design Science Research Methodology. This proposed framework has the ability to transform the existing information system services into chat services with RBAC role, session, validation and natural interaction using Indonesian-language conversations. The framework that consists of Initiate layers, business process and communication, memory group and OLTP DBMS will produce low-cost solution for the development of integrated information systems service.
Volume: 16
Issue: 6
Page: 2799-2808
Publish at: 2018-12-01

Speech Recognition Application for the Speech Impaired using the Android-based Google Cloud Speech API

10.12928/telkomnika.v16i6.9638
Nenny; Universitas Islam Negeri Syarif Hidayatullah Jakarta Anggraini , Angga; Universitas Islam Negeri Syarif Hidayatullah Jakarta Kurniawan , Luh Kesuma; Universitas Islam Negeri Syarif Hidayatullah Jakarta Wardhani , Nashrul; Universitas Islam Negeri Syarif Hidayatullah Jakarta Hakiem
Those who are speech impaired (tunawicara in the Indonesian language) suffer from abnormalities in their delivery (articulation) of the language as well their voice in normal speech, resulting in difficulty in communicating verbally within their environment. Therefore, an application is required that can help and facilitate conversations for communication. In this research, the authors have developed a speech recognition application that can recognise speech of the speech impaired, and can translate into text form with input in the form of sound detected on a smartphone. By using the Google Cloud Speech Application Programming Interface (API), this allows converting audio to text, and it is also user friendly to use such APIs. The Google Cloud Speech API integrates with Google Cloud Storage for data storage. Although research into speech recognition to text has been widely practiced, this research try to develop speech recognition, specially for speech impaired's speech, as well as perform a likelihood calculation to see the factor of tone, pronunciation, and speech speed in speech recognition. The test was conducted by mentioning the digits 1 through 10. The experimental results showed that the recognition rate for the speech impaired is about 80%, while the recognition rate for normal speech is 100%.
Volume: 16
Issue: 6
Page: 2733-2739
Publish at: 2018-12-01

A Conceptual Framework for Gamified Learning Management System for LINUS Students

10.11591/ijeecs.v12.i3.pp1380-1385
Syadiah Nor Wan Shamsuddin , Muhammad Faisal Selman , Ismahafezi Ismail , Maizan Mat Amin , Norkhairani Abdul Rawi
Gamification is a term that refers to the use of game elements in non-game contexts. Gamification in education is emerging as an effective tool to motivate and engage learners in a variety of tasks. LINUS program is intended to ensure that all students from standard one are able to master the basics of reading, writing and counting at the end of standard three. Gamification will help as a learning tool to assist with the learning process for those who have difficulty in learning, unlike normal students. Therefore, the aim of this paper is to propose a framework of Gamified Learning Management System for Linus students. This framework consists of mechanisms of gamification elements, multimedia elements and learning theory that construct gamified learning management system.
Volume: 12
Issue: 3
Page: 1380-1385
Publish at: 2018-12-01

Low-Cost Fiber Optic Chemical Sensor Development for Fishpond Application

10.12928/telkomnika.v16i6.10493
Budi; Universitas Pendidikan Indonesia Mulyanti , Yuski Maolid Rizki; Universitas Pendidikan Indonesia Faozan , Ajuni B.; Universitas Pendidikan Indonesia Pantjawati , Roer Eka; Universitas Pendidikan Indonesia Pawinanto , Lilik; Universitas Pendidikan Indonesia Hasanah , Wahyu Sasongko; Institut Teknologi Sumatera Putro
In this study, aimed to develop low-cost sensor based on fiber optic to assess ammonia index for fishpond application. Here, the simple design was proposed by using Evanescent wave type to assess ammonia index during acid rain event. The experiment result showed maximum absorption loss with variation ammonia mass 1~5% with wavelength 1310 nm from Optical Light Source (OLS) is 27.56 dBm while Optical Spectrum Analyzer (OSA) reached 25.86 dBm. We had calculated RMSE, MAE, and Percent Error (PE) value both of the device (Low-cost fiber optic chemical sensor and OSA) are 1.692%, 0.916%, and 98.833% respectively. A good result from low cost fiber optic chemical sensor has successful developed with lowest production less than 1,455 USD per-year.
Volume: 16
Issue: 6
Page: 2921-2929
Publish at: 2018-12-01

Performance Investigation of Grid Connected Photovoltaic System Modelling Based on MATLAB Simulation

10.11591/ijece.v8i6.pp4847-4854
Adnan Hussein Ali , Hassan Salman Hamad , Ali Abdulwahhab Abdulrazzaq
Photovoltaic (PV) systems are normally modeled by employing accurate equations dealing with a behavior the PV system. This model has Characteristic of PV array cells, which are influenced by both irradiation and temperature variations. Grid-connected PV system is considered as electricity generated solar cell system which is connected to the grid utilities. This paper characterizes an exhibiting and simulating of PV system that executed with MATLAB /Simulink. The impact of solar irradiances as well as ambient temperature performances of PV models is investigated and noted that a lower temperature provides maximum power higher so that the open circuit voltage is larger. Furthermore, if the temperature is low, then a considerably short circuit current is low too.
Volume: 8
Issue: 6
Page: 4847-4854
Publish at: 2018-12-01

Transient Power Quality Performance of Multi Photovoltaics using MPPT P and O/MPPT Fuzzy

10.12928/telkomnika.v16i6.9897
Amirullah; Institut Teknologi Sepuluh Nopember Amirullah , Agus; University of Bhayangkara Surabaya Kiswantono , Ontoseno; Institut Teknologi Sepuluh Nopember Surabaya Penangsang , Adi; Institut Teknologi Sepuluh Nopember Surabaya Soeprijanto
This paper presents comparative performance of transient power quality due to multi photovoltaic (PV) integration to grid at both fixed temperature and solar irradiation connected using Maximum Power Point Tracking Perturb and Observe (MPPT P and O)/MPPT Fuzzy. This research is performed as five transient of short-circuit faults on point common coupling (PCC) bus. An artificial intelligence with fuzzy logic controller (FLC) is used to set duty cycle with step variable to control DC/DC boost converter, generate quick convergence to determine MPPT for controlling of PV output voltage. Furthermore the result is compared with MPPT P and O. During transient phase, non-symmetrical faults are able to result an unbalance current/voltage greater than symmetrical faults. On symmetrical faults, MPPT Fuzzy is able to resultan average THD voltage/THD current smaller than MPPT P and O. Otherwise on non-symmetrical faults, MPPT P and O is able to resultan average THD voltage/THD current slightly smaller than MPPT Fuzzy. Both of MPPT P and O and MPPT Fuzzy on all short circuit faults during transient phase are able to result significantly smaller current average THD current than average THD voltage and limits of THD prescribed in IEEE 519. This research is simulated using Matlab/Simulink environment.
Volume: 16
Issue: 6
Page: 2967-2979
Publish at: 2018-12-01

An Intelligent Framework Prototype for Monitoring Students in Virtual Classroom

10.11591/ijeecs.v12.i3.pp1151-1158
Ashutosh Satapathy , Jenila Livingston L. M
Virtual classroom is one of the fastest growing educational technologies used by many industries and institutions. Today, Voice over Internet Protocol (VoIP) cloud is become a most accepted replacement to different virtual classroom technologies such as internet chat, internet radio, web conferencing, traditional video conferencing and peer to peer VoIP calls. It provides greater flexibility, reliability and cost efficient telecommunication features and operates on comparatively lesser bandwidth. Involvement of new technology in virtual classroom makes it more reliable to teachers and students. Still it follows traditional methods to monitor students by invigilator whether it may be inside the classroom or home study. A secure framework for virtual classroom is developed to not only monitor student’s activities continuously but also the amount of time spent by each student and provide security against unsecure unauthorized login. An effective monitoring System based on Liveness Face Detection techniques is proposed to add more flexibility to conduct virtual classroom and also increases the level of securities of each student’s accounts.
Volume: 12
Issue: 3
Page: 1151-1158
Publish at: 2018-12-01

Using Alpha-cuts and Constraint Exploration Approach on Quadratic Programming Problem

10.12928/telkomnika.v16i6.11584
Yosza; Universiti Teknikal Malaysia Melaka (UTeM) Dasril , Zahriladha; Universiti Teknikal Malaysia Melaka (UTeM) Zakaria , Ismail Bin; Universiti Putra Malaysia (UPM) Mohd
In this paper, we propose a computational procedure to find the optimal solution of quadratic programming problems by using fuzzyalpha-cuts and constraint exploration approach. We solve the problems in the original form without using any additional information such as Lagrange’s multiplier, slack, surplus and artificial variable. In order to find the optimal solution, we divide the calculation in two stages. In the first stage, we determine the unconstrained minimization of the quadratic programming problem (QPP) and check its feasibility. By unconstrained minimization we identify the violated constraints and focus our searching in these constraints. In the second stage, we explored the feasible region along side the violated constraintsuntil the optimal point is achieved. A numerical example is included in this paper to illustrate the capability of alpha-cuts and constraint exploration to find the optimal solution of QPP.
Volume: 16
Issue: 6
Page: 2782-2790
Publish at: 2018-12-01

Optimal Control for Torpedo Motion based on Fuzzy-PSO Advantage Technical

10.12928/telkomnika.v16i6.8979
Viet Dung; Ho Chi Minh City University Do , Xuan Kien; Ho Chi Minh City University Dang
The torpedo is a nonlinear object which is very difficult to control. Via to manage the rudder angle yaw, the diving plane angle, and the fin shake reduction, the torpedo yaw horizontal, the depth vertical and roll damping of the system are controlled accurately and steadily. In this paper, the particle swarm optimization is used to correct the imprecision of architecture fuzzy parameters. The coverage width of membership function and the overlap degree influence of neighboring membership functions are considered in the method to adjust dynamically from the system errors. Thereby optimizing the control signal and enhancing the torpedo motion quality. The proposed method results in a better performance compared to the other control method such as adaptive fuzzy-neural that proved effective of the proposed controller.
Volume: 16
Issue: 6
Page: 2999-3007
Publish at: 2018-12-01

A Comprehensive Review on Applications of Don’t Care Bit Filling Techniques for Test Power Reduction in Digital VLSI Systems

10.11591/ijeecs.v12.i3.pp941-949
Sanjoy Mitra , Debaprasad Das
Massive power consumption during VLSI testing is a serious threat to reliability concerns of ubiquitous silicon industry. A significant amount of low-power methodologies are proposed in the relevant literature to address this issue of test mode power consumption and don’t care bit(X) filling approaches are one of them in this fraternity. These don’t care(X) bit filling techniques have drawn the significant attention of industry and academia for its higher compatibility with existing design flow as neither modification of the CUT is required nor they need to rerun the time-consuming ATPG process. This paper presents an empirical survey of those X-bit filling techniques, applied to mitigate prime two types of dynamic power dissipation namely shift power and capture power, occurred during full scan testing.
Volume: 12
Issue: 3
Page: 941-949
Publish at: 2018-12-01
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