Proceeding of the Electrical Engineering Computer Science and Informatics
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ISO/IEC 9126 Quality Model for Evaluation of Student Academic Portal
Get PDFThe papers discuss and evaluate the quality of student academic portal using ISO / IEC 9126 quality modeling approach. Quality factors are tested and analyzed are characteristics of Usability, Reliability, Efficiency, and Portability, this evaluation is very important, considering the number of users of the portal system so much and growing. one of the efforts to improve and optimize the performance of the academic information system management team. Evaluate the quality of the user perception approach 10 principles of usability heuristics and internal site performance testing or web server. The results of analysis and testing of 4 quality characteristics have issued several recommendations for improvement and optimization of the performance of student academic portals
A Relative Rotation between Two Overlapping UAV's Images
Get PDFIn this paper, we study the influence of varying baseline components on the accuracy of a relative rotation between two overlapping aerial images taken form UAV flight. The case is relevant when mosaicking UAV's aerial images by registering each individual image. Geotagged images facilitated by a navigational grade GPS receiver on board inform the camera position when taking pictures. However, these low accuracies of geographical coordinates encoded in an EXIF format are unreliable to depict baseline vector components between subsequent overlapping images. This research investigates these influences on the stability of rotation elements when the vector components are entered into a standard coplanarity condition equation to determine the relative rotation of the stereo images. Assuming a nadir looking camera on board while the UAV platform is flying at a constant height, the resulted vector directions are utilized to constraint the coplanarity equation. A detailed analysis of each variation is given. Our experiments based on real datasets confirm that the relative rotation between two successive overlapping image is practically unaffected by the accuracy of positioning method. Furthermore, the coplanarity constraint is invariant with respect to a translation along the baseline of the aerial stereo images
Application of Ultra-Wideband Double Layer Printed Antenna for Partial Discharge Detection
Get PDFPartial discharge (PD) is a local electrification phenomenon that partially connects insulation between the conductors and occurs either on the surface of the conductor or inside the insulation (void). During the PD there are several phenomena that accompany the occurrence of PD, such as impulse currents, heat radiation, electromagnetic waves, mechanical waves and chemical processes. This phenomenon is detected and measured to know the existence of PD. One of the PD measurements is ultra high frequency (UHF) method, by measuring the waves generated by PD using antenna. One of antenna having good characteristics is UWB double layer printed antenna. In this paper the application of ultra-wideband double layer printed antenna for partial discharge detection is reported. The application of antenna on PD measurement, shows that the antenna is able to detect PD. The characteristics of PD: PDIV, PDEV, PD waveform are measured using this antenna. Ultra-wideband (UWB) double layer printed antenna is an antenna developed from a square microstrip antenna with symmetrical T-shaped tethering. The proposed antenna is implemented on Epoxy FR-4 substrate with permittivity of 4.3, thickness of 1.6mm, and 72.8mm x 60.0mm in size. The VNA testing of the antenna shows that the antenna bandwidth is from 50MHz to 2.30GHz. The measured results of PD wave are PDIV, PD waveform and PDEV
Knowledge Management Maturity Assessment in Air Drilling Associates using G-KMMM
Get PDFSince the early 1990s, companies in the oil & gas industry have realized that their business operations are knowledge-based, where company performance can be derived from faster identification, an assessment of an opportunity, and the speed of an exploitation. The oil & gas industry is one of the leading industries in the application and development of knowledge management; this is caused by changes in market and technology from 1990s to the beginning of the 21st century. Utilizing knowledge management is a must to be able to compete with other oil and gas industry companies. Currently, Air Drilling Associates (ADA) as one of the companies in oil & gas industry already has implemented knowledge management system, but its benefits are far from the expectation. In order to position their efforts and initialize knowledge management, companies need framework to use as a template. The objective of this paper is to measure the knowledge management maturity of Air Drilling Associates and other suggestion related to knowledge management for improvement
PSS Design Based on Fuzzy Controller with Particle Swarm Optimization Tuning
Get PDFThe research was conducted for implementing of PSS (Power system stabilizer) which was designed based on the fuzzy logic controller (FLPSS). This approach has a main purpose for stabilizing and improving the damping of synchronous machine. The speed and active power deviation were used as fuzzy controller's inputs. The controller's output was forwarded into AVR subsequently. In order to achieve optimal setting, the optimal criteria of the Integral of Time were multiplied by the Absolute Error (ITAE). The performance of the proposed PSS under small disturbances, system parameters and loading conditions was tested. The experiment's results showed the usefulness of the specified method for damping out the system oscillations
Modulation Strategies for Indirect Matrix Converter: Complexity, Quality and Performance
Get PDFIn general, there are two main classifications in matrix converters. The most common known type is conventional matrix converter (CMC) or direct matrix converter (DMC). The other type is indirect matrix converter (IMC). A brief review for modulation strategies are provided in this work for modulation strategies in IMC. There are several popular modulation methods for IMC such as carrier-based modulation and space vector modulation (SVM). A sinusoidal current waveform is produced on the input and output sides to implement the modulation method. In the conclusion the modulation methods will compared based on performance, theoretical complexity, and some other parameters
E-Government Service Evaluation of Batu City Health Dept.using e-Govqual Approach and IPA Analysis
Get PDFE-Government is an application of government information system technology to support public service system and dissemination of information from government to society that used in every element of government. Batu City Health Office website (http://dinkes.batukota.go.id) is part of Batu City Government e-Government system that was built to support publication of government information to the public. According to observations, there was a decline in visitors from the number 150 visitors in October 2017 to 50 visitors in November 2017. While in December 2017 stable at the number 50 visitors. Based on the anomaly incident, there needs to be an evaluation of e-Government in Batu City Health Office by doing the assessment of website service quality from the user side. This evaluation uses e-Govqual and Heuristic Evaluation methods. Assessment of e-govqual attributes on performance values and interests in the IPA quadrant resulted in the conclusion that there are 24 attributes in A and C quadrants in the IPA quadrant that need to improve attribute quality. Suggestions based on quadrant A and C in the form of recommendation improvement in the form of recommendation mockup based on 10 principles of heuristic evaluatio
Implementation of Obfuscation Technique on PHP Source Code
Get PDFSource code on web based applications can be altered easily. This occurred because the source code is not compiled into an executable file. Hence, it can be read and copied easily, or be changed without permission from the author. Obfuscation is a technique that commonly used to secure the source code in any websites based application. Obfuscation is a technique to randomize the source code that make the code harder to read but still runnable, but this make the running time increased and the application will run slower then it supposed to. This increased time caused by reverse obfuscation proses to bring back the source code into originally form before interpreted by web server. This studi intended to create an obfuscation technique that keeping the application run time performance as not obfuscated called Wanna Crypt. The methods to create this applications are (1) system design using UML, (2) implementation of the system, which is done by coding or writing scripts using PHP, HTML, JavaScript, CSS to build Wanna Crypt based website, (3) Blackbox and Whitebox testing to compare the execution time. From the tests, it can be concluded that web applications using Wanna Crypt provide a longer response time than web applications without using obfuscation
Stator Flux Oriented Control of Three-Phase Induction Motor with Improved Decoupling Scheme
Get PDFThis paper proposes an improved decoupling scheme of stator flux-oriented control for three-phase induction motor. The simulation software used in this paper is MATLAB Simulink®. The result of the simulation indicates that this stator flux-oriented control can control the speed of the rotor angle and stator magnetization current successfully. The angular velocity of 120 rad/s achieved by settling time 2 seconds in critically-damped response and steady-state error 0.083%. The controller can overcome the external disturbance in the form of load torque of 5 Nm which has been simulated in this paper. The proposed stator voltage decoupling scheme which is used in this simulation is correct and become one of success factor of this control method
A Design of Coreless Permanent Magnet Axial Flux Generator for Low Speed Wind Turbine
Get PDFMost of the available generators in the market are a high speed induction generator which requires high rotational speed and electricity to generate a magnetic field. However, there are very few low-speed generators that exist in the market that available for small energy resources. This paper aims to design and simulate a Coreless Permanent Magnet Axial Flux Generator (PMAFG) for low speed wind turbine. An axial flux generator was designed to have a low speed rotation using a permanent magnet of the type Neodymium Iron Boron (NdFeB). The model was examined with excel to data analyzed. Coreless PMAFG is a generator that is enabled to turn on energy at low speeds. The chosen model was Double Rotor - Single Stator (12 Slots 8 Poles) using Infolytica Magnet software. Finite Element Method (FEM) was employed to analyze the phenomena of the magnetic flux. The test was simulated using static rotation method, which rotated every 3 degrees at 350 rpm with 100 turns and 10, 30, 50, 80 and 100 Ohm of load variations. Compare to the calculation of the design, results of the simulation in terms of voltage, current, power and efficiency had been met with only very small error