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INDONESIA
Indonesian Journal of Electrical Engineering and Computer Science
Published by Institute of Advanced Engineering and Science
ISSN : 25024752     EISSN : 25024760     DOI : -
Core Subject :
Arjuna Subject : -
Articles 9,199 Documents
 356   357   358   359   360 
Nonlinear Dynamics Research between Drill Pipe and Coal Hole Wall during Gas Extraction Drilling Xiaoming Han; Chenxu Luo; Qiangqiang Zhang
Indonesian Journal of Electrical Engineering and Computer Science Vol 2, No 1: April 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v2.i1.pp215-220

Abstract

This paper analyzes the impact of gas drainage borehole drilling rod vibration phenomena stability.Taking 100m hole depth in underground coal mine as an example, the dynamic simulation analysis of the underground gas drainage drilling rod was carried out by using the ANSYS finite element dynamic analysis module LS-DYNA method.According to the collision course between the drill pipe and the coal hole wall, the Lagrange algorithm is introduced to analyze the stress change of drill pipe in the collision course of 98mm, 108mm, 118mm and 128mm. The failure mechanism of drill pipe fatigue fracture and hole wall instability caused by the collision between drill pipe and coal hole is analyzed. The results show that the stress caused by the impact of drilling speed, drilling pressure and coal hole diameter is larger than that caused by the collision between drill pipe and coal wall.
Exploring mobile learning development lifecycle with cultural context Wan Abdul Rahim Wan Mohd Isa; Ahmad Iqbal Hakim Suhaimi; Nurulhuda Noordin; Rabiatul Adawiyah Hashim
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 2: November 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i2.pp903-909

Abstract

Based on the preliminary study, there are two problems that the development team faces; lack of development model or guideline with culture context for mobile learning developments and lack of cultural context in user interface and user experience of mobile learning development and practices. The main objectives are; (i) to propose Mobile Learning Development Lifecycle Cultural Model and to (ii) assess the proposed Mobile Learning Development Lifecycle Cultural Model. An IT scholar and five IT staff involved in mobile learning development based on the public and private sector at Klang Valley, Malaysia had been chosen for the interview session. The collected data has been analyzed by applying the thematic analysis approach. The first objective was achieved based on IT scholar reviewed on the model proposed. The IT scholar reviewed, (i) challenges on mobile learning development, (ii) theory of Hofstede on the design phase, (iii) user persona on the requirements phase, (iv) advantages of using the proposed model and (v) challenges on Mobile Learning Development Lifecycle Cultural Model. Then, the second objective was achieved by analyzing the qualitative information from the IT staff on the model proposed. The assessment was done by the IT staff for the Mobile Learning Development Lifecycle Cultural Model. There were four primary categories highlighted by the IT staffs which were (i) challenges on mobile learning development, (ii) overcome the challenges, (iii) important elements in mobile learning development and (iv) advantages of Mobile Learning Development Lifecycle Cultural Model. For future work, this study can include more IT scholar and IT staff from diverse positions from multiple organizations.
Hysteretic Behavior of Steel Column Strengthened With CFRP in Thermal Environment Zhen-Guo Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 5: September 2012
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This paper is concerned with analysis for the strengthening effect of carbon fiber-reinforced polymer (CFRP) on steel columns under cyclic lateral loading in thermal environment. Based on the finite element theory of thermo-elastic problem and steel structure stability theory, the hysteretic behavior of axial compression steel columns was studied by using Ansys software. The main variables investigated are:  cyclic lateral loading, temperature, axial compression ratio and ductility. The results show that the CFRP wraps can improve the ultimate cyclic lateral loading and ductility of steel columns prominently in thermal environment which benefit to the anti-seismic capacity of steel structure. The effect of axial compression ratio on ultimate cyclic lateral loading is very obvious, more enhancements achieved with the axial compression ratio increased. While effect of temperature on ultimate cyclic lateral loading is not very obvious below 300℃. DOI: http://dx.doi.org/10.11591/telkomnika.v10i5.1278 
Optimal Placement of Sensors in Mission-specific Mobile Sensor Networks Hicham Ouchitachen; Abdellatif Hair; Najlae Idrissi
Indonesian Journal of Electrical Engineering and Computer Science Vol 16, No 1: October 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v16.i1.pp191-198

Abstract

Placement of nodes has been the major challenge in wireless sensor networks. The data reported from a sensor is only useful when the position of that sensor is found. In this context, several techniques have been proposed to conserve power consumption and to prolong the lifetime of the wireless sensor networks. In this paper, we propose a new algorithm that accurately finds the best locations of sensors while minimizing the average energy consumed in the network. More precisely, we consider a critical network in each sensor satisfying its own missions and depending on its locations. In addition to fulfill their mission, the sensor tries to maintain a good neighboring nodes quality. we determine the location of node by using two criteria: the cost and the quality of communication. The aim of this work is to develop a new algorithm so as to solve the complicated optimization problem posed in this case while minimize the total energy consumption. Our simulation results demonstrate that our algorithm is very advantageous in terms of convergence to the appropriate locations.
Vibration and Noise Analysis of 4Ф Switched Reluctance Motor Drive Mekala N; Muniraj C; Ramesh Balaji S.M.
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 3: June 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Switched Reluctance Motor (SRM) is getting large attention for industry application due to their simple construction, high starting capabilities, high reliability, and high efficiency and also rotor carries no windings, no slip-rings there is no brushes, it requires less maintenance. In spite of the merits, it had some demerits like acoustic noise and vibration is one of major issues in SRM. The DSP-TMS320F28335 processor were implemented due to their high performance for the control applications.In this work the Random Pulse Width Modulation (RPWM) technique is used to reduce the acoustic noise and vibration by varying random turn on and turn off angle control.The acoustic noise and vibration signals are measured using accelerometer and sound level meter in 1HP, 8/6poles of SRM drive. The experimental analysis of vibration signals are measured using Lab VIEW at different speeds and load conditions. The acoustic noise signals are measured using Sound level meter .Both the Acoustic and vibrations are analyzed experimentally for different speeds and load conditions. The experimental results show that the noise and vibration analysis and also compare the sinusoidal PWM is better than Random PWM techniques. DOI: http://dx.doi.org/10.11591/telkomnika.v14i3.7965 
The Embedded Information Acquisition System of Forest Resource Ying Liu; Yantao Zhu; Yurong Li; Chao Ni
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 7: November 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Forest resource is the material basis of forestry production and forestry sustainable development. Mastering the basic status of forest resource provides effective basis for forest resource’s scientific management. Nowadays the concept of “Digital Forestry” is put forward and 3S technology is used in forestry.  Therefore the   embedded system of forest resource information acquisition has been designed which integrated embedded technology with GIS, 3G wireless communication technology and GPS. After analyzing the requirement of forestry resource, the overall structure has been established and the system has been developed by using the advanced demo-board OMAP3530.There are  six functions including system login, data acquisition, data manage, map operation, GPS positioning and navigation, temperature and humidity measuring to enhance working efficiency, reduce power consumption and get real-time data. On the building Qt/Embedded platform, the upper application program interface is designed. Linux system and applications are successful transplanted. Adopting GPS technology, real-time positioning, navigation and latitude and longitude display functions are achieved. At the same time, the collected small class survey data and temperature and humidity data can be saved; the data can be uploaded and downloaded by using 3G module from internet. The embedded system of forest resource information acquisition has been verified in Lianyungang Xinpu district forest of China, which gives a good guide to forestry management. DOI: http://dx.doi.org/10.11591/telkomnika.v10i7.1662
Economical fabrication of graphite/paper-based humidity sensor Shuthish Elangkovan; Mastura Shafinaz Zainal Abidin; Shaharin Fadzli Abd Rahman; Mohammad Shafiq Che Soh; Ahmad Bukhairi Md Rashid
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 1: October 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i1.pp54-59

Abstract

Paper is regarded as a promising alternative for low-cost and biodegradable substrate. Paper can be a very good humidity detecting substrate due to its capability to absorb water vapour, thanks to its porous surface. This work explores the feasibility of developing a paper-based humidity sensor using simple and low cost fabrication process. Two type of electrode structures, namely interdigitated and parallel electrode, were formed by using two different pencil grade. The pencil grades used were 2B and 6B. The current-voltage (I-V) characteristics of the fabricated device were measured under different relative humidity and its humidity sensing operation was analyzed. It was observed that the sensor with the 6B and parallel electrode configuration was the most responsive to humidity changes while the 6B interdigitated sensor was the second best. The sensors fabricated with the 6B electrodes are better at sensing humidity changes compared to the sensors fabricated using 2B electrodes.
An automatic multi-axis solar tracking system in Ramadi city: design and implementation Mustafa Hamid AL-Jumaili; Hussein M Haglan; Mohammed K Mohammed; Qusay H Eesee
Indonesian Journal of Electrical Engineering and Computer Science Vol 19, No 3: September 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v19.i3.pp1126-1234

Abstract

In this paper, a complete design and implementation of an automatic multi-axis solar tracking system has been introduced. The main purpose of this system is to track sun location and gain the maximum energy output of the solar panels. The system is Multi-axis using microcontroller and photocells to control the direction of the penal, whereas the penal is facing the sun at all times of the day. The system is a combination of hardware and software parts that work concurrently to achieve a precise angular Sun tracking. A base, penal frame, super jack motors, high-efficiency solar panel, arduino uno microcontroller, relays, rechargeable battery, light dependent resistor (LDR) have been used for the system’s hardware part. These hardware parts need a high-level programming code, as a software part, to be embedded in the microcontroller to get an effective and precise solar tracking system. The results of the presented system were compared to a fixed direction system. The results show significant efficiency improvement of 24% over the static one. For a city like Ramadi, which has a high irradiance all over the year, it is very fruitful to use such tracking systems along with photovoltaic installation systems. 
Optimized output-based input shaping for control of single-link flexible manipulator using linear matrix inequality Nura Musa Tahir; Mustapha Muhammad; Bashir Bala Muhammad; Haliru Liman; Aminu Yahaya Zimit; Auwal Shehu Tijjani
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 1: October 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i1.pp109-116

Abstract

Precise hub angle positioning due to tip deflections, flexible motions and under various payloads is enormous tasks in the control of single-link flexible manipulators. In this paper, output-based command shaping (OBCS) was designed using the system output for tip deflections and residuals vibrations suppression, and this was incorporated with a linear matrix inequality (LMI) closed-loop control scheme for precise hub angle positioning.  The robustness of the hybrid control scheme was tested by changing the payloads from 0g to 30g, and 50g. Simulation results showed that endpoint residuals vibrations and tip deflections due to flexible motions were suppressed and hence precise hub angle positioning under various payloads was achieved. Integral absolute error (IAE), integral square error (ISE) and time response analysis (TRA) were used as the performance indexes. Hence, the hybrid control scheme is simple and robust.
Gender stereotype and hostile sexism among young korean gamers based on teammate selection strategy and game style preferences Doo Heon Song; Hae Kyung Rhee; Jeong Hoon Kim
Indonesian Journal of Electrical Engineering and Computer Science Vol 19, No 3: September 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v19.i3.pp1512-1518

Abstract

Female gamers are growing rapidly worldwide especially in young age groups and in mobile platform. Since that population change appears in recent 10 years, formerly male-oriented gaming community has confronted gender issues. In this paper, we witness that a strong gender stereotype exists for both genders in Korea by two surveys. In the first survey, subjects show that they have different expectations of opposite gender’s favorable game style where both genders have exactly same favorite styles. In the second survey, we investigate how members of hostile sexism community groups choose teammates in Overwatch game if they have privilege to select teammates for specific roles. Ilbe and Womad as two far extreme misogyny and misandry groups show hostile sexism in teammate selection. The result implies that hostile sexism and gender stereotype shown in game playing may be induced from other social factors than the amount of the game playing experiences.       

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