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30,609 Article Results

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

A Sub-Region Based Space Vector Modulation Scheme for Dual 2-Level Inverter System

10.11591/ijece.v8i6.pp4902-4911
R. Palanisamy , A. Velu , K. Selvakumar , D. Karthikeyan , D. Selvabharathi , S. Vidyasagar
This paper deals the implementation of 3-level output voltage using dual 2-level inverter with control of sub-region based Space Vector Modulation (SR-SVM). Switching loss and voltage stress are the most important issues in multilevel inverters, for keep away from these problems dual inverter system executed. Using this proposed system, the conventional 3-level inverter voltage vectors and switching vectors can be located. In neutral point clamped multilevel inverter, it carries more load current fluctuations due to the DC link capacitors and it requires large capacitors. Based on the sub-region SVM used to control IGBT switches placed in the dual inverter system. The proposed system improves the output voltage with reduced harmonic content with improved dc voltage utilisation. The simulation and hardware results are verified using matlab/simulink and dsPIC microcontroller.
Volume: 8
Issue: 6
Page: 4902-4911
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

Employee Performance Measurement in Teleworking Using Balanced Scorecard

10.11591/ijece.v8i6.pp5178-5184
Sunu Sugi Arso , Sfenrianto Sfenrianto , Mochamad Wahyudi
Key Performance Indicator (KPI) must be aligned with the development of the organization. PT. Mitra Intregrasi Informatika (MII) in its development decided to change the traditional way of work to modern telework. This encourages companies to adjust employee’s KPI from the traditional way of work turns in to telework. In order to perform KPI measurement of its employees based on teleworking, this research uses balanced scorecard method approach that is by taking into account financial, customer, and internal business process and learning and growth perspective. The results of this study are the design proposal KPI employees to accommodate telework at the company. Then KPI employee test results showed an increase in the average value of the employee KPI of 0.295 points (9.47%) of the old KPI. Thus, it is recommended to the company to implement the employee KPI.
Volume: 8
Issue: 6
Page: 5178-5184
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

Wireless Technology for Monitoring Site-specific Landslide in Vietnam

10.11591/ijece.v8i6.pp4448-4455
Gian Quoc-Anh , Nguyen Dinh-Chinh , Tran Duc-Nghia , Tran Duc-Tan , Kieu Nguyen Thi , Kumbesan Sandrasegaran
Climate change has caused an increasing number of landslides, especially in the mountainous provinces of Vietnam, resulting in the destruction of vital transport and other infrastructure. Current monitoring and forecasting systems of the meteorology department cannot deliver accurate and reliable forecasts for weather events and issue timely warnings. This paper describes the development of a simple, low cost, and efficient system for monitoring and warning landslide in real-time. The authors focus on the use of wireless and related technologies in the implementation of a technical solution and some of the problems of the wireless sensor network (WSN) related to power consumption. Promising compressed sensing (CS) based solution for landslide monitoring is discussed and evaluated in the paper.
Volume: 8
Issue: 6
Page: 4448-4455
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

Modified SEPIC Converter Performance for Grid-connected PV Systems under Various Conditions

10.12928/telkomnika.v16i6.10148
Rizky Ajie; Universitas Negeri Semarang Aprilianto , Subiyanto; Universitas Negeri Semarang Subiyanto , Tole; Universitas Ahmad Dahlan Sutikno
Step-up converter is widely used to increase DC voltage level on PV systems either off-grid or grid connected. One of the step-up converters often used in PV systems is SEPIC converter. To improve its performance, many SEPIC converters have been modified. However, performance on various conditions has not been further investigated. In this study, the modified SEPIC converter was investigated under various change conditions for grid-connected PV applications. This converter was modelled and simulated using PSIM software. The modified SEPIC converter received input from PV array 15 kWp, and its output was connected to the three-phase inverter with grid and load. The irradiance level and ambient temperature were varied to test its performance and compared to Boost converter and SEPIC converter. For all tests, the performance of modified SEPIC converter was better than other step-up converters because it was able to rectify the quality of output voltage and more efficient.
Volume: 16
Issue: 6
Page: 2943-2953
Publish at: 2018-12-01

Using Partial Credit Model to Improve the Quality of an Instrument

10.11591/ijere.v7i4.15146
Saras Krishnan , Noraini Idris
In using the Rasch model to improve the quality of an instrument, analysis purports to determine if the sample collaborates well with the items in the instrument such that the results are measuring a single underlying variable. The relevant properties of Rasch analysis are reliability and validity which are key indicators of the quality of a measurement instrument. This paper discusses the use of one type of Rasch model that is the Partial Credit Model to investigate reliability and validity of an instrument. By removing or changing items in the instrument when conditions of reliability and validity are not met, the quality of the instrument is improved.
Volume: 7
Issue: 4
Page: 313-316
Publish at: 2018-12-01

Radial Derivative and Radial Inversion for Interpreting 4D Gravity Anomaly Due to Fluids Injection Around Reservoir

10.12928/telkomnika.v16i6.9468
Muhammad; Universitas Gadjah Mada Zuhdi , Sismanto; Universitas Gadjah Mada Sismanto , Ari; Universitas Gadjah Mada Setiawan , Jarot; Universitas Gadjah Mada Setyowiyoto , Adi; Universitas Brawijaya Susilo , Muhammad; Universitas Lampung Sarkowi
The 4D gravity or time lapse gravity has been used many reseracher to identify fluid injection in oil reservoir. The objective of this study is to find the better way in interpreting 4D gravity anomaly due to fluid injection around the reservoir. Radial Derivatives are derivative values of gravity anomalies against horizontal distances in the radial direction. Radial inversion is a two-dimensional inversion of lines with radial directions resulting in a 3-dimension model. Time lapse microgravity research have been performed in “X Oil Field” with amount of 604 data point covering area of 4000m x 5000m. This Radial derivative and Radial inversion have been aplied at an injection well of the X oil field. The yield show that 4D gravity anomaly value due to injection is 0.02 mGal to 0.36 mGal. Radial derivative value in the area is 0 micro Gal/cm to 0,012 mGal/meter. Radial inversion shows radius of fluid front movement is 304 meters to 1120 meters. Radial derivative and Radial inversion have been proven fairly good to identify injected fluid movement in the reservoir.
Volume: 16
Issue: 6
Page: 2855-2863
Publish at: 2018-12-01
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