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31,377 Article Results

Control of Pole-Climbing Robot Orientation using Self-Tuning Method

10.11591/ijpeds.v9.i3.pp1029-1037
Muhammad Aziz Muslim , Goegoes Dwi Nusantoro , Rini Nur Hasanah , Mokhammad Hasyim Asy’ari
This paper describes the method to control a hybrid robot whose main task is to climb a pole to place an object on the top of the pole. The hybrid pole-climbing robot considered in this paper uses 2 Planetary PG36 DC-motors as actuators and an external rotary encoder sensor to provide a feedback on the change in robot orientation during the climbing movement. The orientation control of the pole-climbing robot using self-tuning method has been realized by identifying the transfer function of the actuator system under consideration, being followed with the calculation of control parameters using the self-tuning pole-placement method, and furthermore being implemented on the external rotary encoder sensor. Self-tuning pole-placement method has been explored to control the parameters q0, q1, q2, and p1 of the controller. The experiments were done on a movement path in a form of a cylindrical pole. The first experiment was done based one the change in rotation angle of the rotary sensor with the angle values greater than 50˚ in the positive direction, whereas the second experiment was done with the angle values greater than -50˚ in the negative direction. The experiment results show that the control of the robot under consideration could maintain its original position at the time of angle change disturbance and that the robot could climb in a straight direction within the specified tolerance of orientation angle change.
Volume: 9
Issue: 3
Page: 1029-1037
Publish at: 2018-09-01

Input Current Ripple Analysis of Multiphase PWM Inverters

10.11591/ijpeds.v9.i3.pp1432-1444
Anwar Muqorobin , Pekik Argo Dahono
This paper investigates the relationship between inverter phase number and inverter input current ripple. Analysis results show that increasing the phase number more than nine cannot provide significant input current ripple reduction. The input current ripple is not affected by the switching frequency. Simulation and experimental results are included in this paper to show the validity of the proposed analysis method.
Volume: 9
Issue: 3
Page: 1432-1444
Publish at: 2018-09-01

The Recovery of Energy from a Hybrid System to Improve the Performance of a Photovoltaic Cell

10.11591/ijpeds.v9.i3.pp957-964
Abdelhak Lekbir , Chin Kim Gan , Mohd Ruddin Ab Ghani , Tole Sutikno
The main objective of this work is to study a photovoltaic/thermoelectric hybrid generator system, ranging from characterisation of thermoelectric (TE) and photovoltaic (PV) modules basic elements of thermal and PV energy conversion into electrical energy through necessary modelling steps. The bibliographic study allows TE and PV generation to be positioned in the current context, by presenting their history and evolution. In some sectors, this technology has already matured. For example, in the space sector, the scientific activity seems to show an acceleration in hybrid systems development in the solar field. This research field remains completely open, as evidenced by the multiplicity of technological solutions implemented. A significant part of this work has been to develop generic energy models of various modules (PV and thermal) for a multi-source generator design, based on experimental tests and existing technologies. In addition, a methodology for sizing optimisation of such generator was proposed by considering surface or volume criteria, number of thermoelectric generator (TEG) modules and temperature gradient.
Volume: 9
Issue: 3
Page: 957-964
Publish at: 2018-09-01

Meso- and microporous carbon electrode and its effect on the capacitive, energy and power properties of supercapacitor

10.11591/ijpeds.v9.i3.pp1263-1271
Erman Taer , R. Taslim , Sugianto Sugianto , M. Paiszal , Mukhlis Mukhlis , W. S. Mustika , Agustino Agustino
Activated carbon monoliths (ACMs) with average pore diameters in the meso- and micropore regions were successfully produced from biomass material. ACM synthesis uses chemical activation with KOH and ZnCl2 activating agents. The carbon and activating agent mass ratios were 1:1, 1:3, 1:5 and 1:7. Both activating materials produced an ACM with an average pore diameter of 3.2 nm. The specific capacitance, specific surface area, energy and power were as high as 63 F/g, 650 m2/g, and 0.23 Wh/kg for KOH and 73 F/g, and 522 m2/g, and 19 W/kg for ZnCl2 activating agents, respectively. For comparison, we also studied the physical and electrochemical properties of ACM with an average pore size in the micropore range from the same raw material.
Volume: 9
Issue: 3
Page: 1263-1271
Publish at: 2018-09-01

Modified AES for Text and Image Encryption

10.11591/ijeecs.v11.i3.pp942-948
Heidilyn V. Gamido , Ariel M. Sison , Ruji P. Medina
Advanced Encryption Standard (AES) is one of the most frequently used encryption algorithms. In the study, the Advanced Encryption Standard is modified to address its high computational requirement due to the complex mathematical operations in MixColumns Transformation making the encryption process slow. The modified AES used Bit Permutation to replace the MixColumns Transformation in AES since bit permutation is easy to implement and it does not have any complex mathematical computation. Results of the study show that the modified AES algorithm exhibited increased efficiency due to the faster encryption time and reduced CPU usage. The modified AES algorithm also yielded higher avalanche effect which improved the performance of the algorithm.
Volume: 11
Issue: 3
Page: 942-948
Publish at: 2018-09-01

Analysis of Different Meta Heuristics Method in Intelligent Fault Detection of Multilevel Inverter with Photovoltaic Power Generation Source

10.11591/ijpeds.v9.i3.pp1214-1222
T. G. Manjunath , Ashok Kusagur
Meta Heuristic methods have made a deep impact in the area of optimization in different streams of engineering. The performance of these algorithms is of importance because the hardware implementation of these algorithms is to be carried out for different engineering applications. As an important application in High Voltage DC (HVDC) transmission and Industrial Drives the multilevel inverter fault diagnosis is carried out using the different meta-heuristic methods with Neural Network as the decision making algorithm. The optimization of the weight and the bias values in the neural network diagnosis system is carried out in order to analyze the performance by means of comparing the Mean Square Error (MSE) while the Neural Network is getting trained for different fault conditions in the multilevel inverter. Matlab based implementation is carried out and the results are tabulated and inferred for a Multilevel Inverter fed from the Photovoltaic power generation system. In order to increase the robustness of the fault detection, with renewable energy based power generation system as the source for the Multilevel Inverter, the feature extracted from the multilevel inverter are positive, negative and zero sequence voltage along with the THD of the output voltage. The optimization algorithm used is Particle Swarm Optimization (PSO), Cuckoo Search Algorithm(CSA), Genetic Algorithm(GA) and Tabu Search Algorithm (TSA).
Volume: 9
Issue: 3
Page: 1214-1222
Publish at: 2018-09-01

Logo Counseling for Low Spiritual Self-Esteem Among College Students

10.11591/ijere.v7i3.13776
Jacob Daan Engel , Lobby Loekmono
The purpose of this research was to examine logo counseling model in improving low spiritual self-esteem problem for college students. This research used descriptive method and quasi-experiment method with a non-equivalent pre-test-post-test control group design. The results then analyzed from the statistical significance and the practical significance. The result showed that logo counseling model could improve low spiritual self-esteem among college students, indicated by statistical significance of tcount (43.851) > ttable (2.144) and N-gain of the experimental group (0.75) > N-gain of the control group (0.15) and practical significance of positive attitude, behavior and value changes. Recommendation also given for related agencies to implement logo counseling model in training program and for further research by related experts in the field.
Volume: 7
Issue: 3
Page: 236-243
Publish at: 2018-09-01

Solving N-Queens Problem Using Subproblems based on Genetic Algorithm

10.11591/ijai.v7.i3.pp130-137
Ismail. A. Humied
Nowadays, permutation problems with large state spaces and the path to solution is irrelevant such as N-Queens problem has the same general property for many important applications such as integrated-circuit design, factory-floor layout, job-shop scheduling, automatic programming, telecommunications network optimization, vehicle routing, and portfolio management. Therefore, methods which are able to find a solution are very important. Genetic algorithm (GA) is one the most well-known methods for solving N-Queens problem and applicable to a wide range of permutation problems. In the absence of specialized solution for a particular problem, genetic algorithm would be efficient. But holism and random choices cause problem for genetic algorithm in searching large state spaces. So, the efficiency of this algorithm would be demoted when the size of state space of the problem grows exponentially. In this paper, the subproblems used based on genetic algorithm to cover this weakness. This proposed method is trying to provide partial view for genetic algorithm by locally searching the state space. This method works to take shorter steps toward the solution. To find the first solution and other solutions in N-Queens problem using proposed method: dividing N-Queens problem into subproblems, which configuring initial population of genetic algorithm. The proposed method is evaluated and compares it with two similar methods that indicate the amount of performance improvement.
Volume: 7
Issue: 3
Page: 130-137
Publish at: 2018-09-01

Experimental Analysis of Simplified Rules Fuzzy Logic Speed Controller for Wide Speed Range Operations

10.11591/ijpeds.v9.i3.pp1090-1097
Md Hairul Nizam Talib , Z. Ibrahim , Z. Rasin , J.Mat Lazi , M. Azri , N.S.Y. Farah
This paper presents the experimental analysis of simplified rules Fuzzy Logic Speed Controller (FLSC) of Induction Motor drive. The maximum gain of input scaling factor, FLSC is generally limited by the coverage of universe of discoursed (UoD). Thus, to further increase the input gain scaling factor, the outer membership function need to be increased.  This analysis covers various values in the range of UoD values from [-1,1] to [-5,5] for the wide speed range operations from low to rated speed ranges. The FLSC is employed to the indirect Field Oriented Control method fed by a voltage source inverter. Simulation and experimental verification is done by using Matlab/Simulink and dSPACE 1103 controller experimental rigs respectively. Based on the results, speed performance behaviours are improved over the wide speed range operations in term of rise time and setting time. The tuning approached is simple without additional algorithm for faster and more accurate response.
Volume: 9
Issue: 3
Page: 1090-1097
Publish at: 2018-09-01

Quadratic Support Vector Machine For The Bomba Traditional Textile Motif Classification

10.11591/ijeecs.v11.i3.pp1004-1014
Nuraedah Nuraedah , Muhammad Bakri , Anita Ahmad Kasim
The Bomba textile is one of the textile fabrics in Indonesia used in a province called Sulawesi Tengah. Bomba Textile has a unique pattern and has a philosophical meaning in human life in Sulawesi Tengah. Bomba Textile has many motif patterns and varied colors. The problem in this research is the difficulty in classifying every The Bomba textile motif in each class. Data classification is needed to recognize the motif of each Bomba textile pattern and to cluster it into the appropriate class. The features used to classify the Bomba textile motif is the textural feature. Texture features obtained from Gray-Level Co-occurrence matrices (GLCM) method consisting of energy, contrast, homogeneity and correlation with four angles 0°, 45°, 90°, and 135°. This research will implement Quadratic Vector Machine (QSVM) method with texture feature on Bomba textile pattern. The use of a single texture feature with angles 90° has an accuracy of 90.3%. The incorporation of texture features by involving all features at all angles can improve the accuracy of the classification model. This research produces a model of motif classification on the Bomba textile which has the classification accuracy of 94.6% and error rate of 5.4%.
Volume: 11
Issue: 3
Page: 1004-1014
Publish at: 2018-09-01

The Influence of Science Literacy-Based Teaching Material Towards Science Achievement

10.11591/ijere.v7i3.14033
Avikasari Avikasari , Rukayah Rukayah , Mintasih Indriayu
Based on PISA assessment result in 2015 on science; Indonesia ranks 69 out of 79 countries. Meanwhile, in science literacy, Indonesia ranks 62 out of 69 countries that are evaluated. That assessment result shows that science achievement and science literacy ability of Indonesian students are low. One of some factors that influences it is the selection of learning resource that does not explain science concept for students. This research is conducted to know the influence of the use of science literacy-based teaching material based on the improvement of fourth grade students’ science achievement. This research is a quantitative research that uses an experimental method. This research is conducted at two elementary schools in Gunungpati, Semarang. The subjects of this research are 46 fourth grade students. The data were collected by using pre-test and post-test to know the students’ score. This research shows that pre-test mean score is 39.935 and the post-test 1 mean score is 66.891. Meanwhile, t-tests show significance 0.000 (<0.05) meaning that there is the difference between pre-test and post-test. Therefore, there is influence on the use of science literacy-based teaching material based on fourth grade students’ science achievement.
Volume: 7
Issue: 3
Page: 182-187
Publish at: 2018-09-01

LED-Lamp Design for Renewable Energy-Based DC House Application

10.11591/ijpeds.v9.i3.pp987-996
Rini Nur Hasanah , Yosi Dwi Handari , Soeprapto Soeprapto , Taufik Taufik
This paper describes the design of an LED lamp to be used in a DC house being supplied using a renewable energy source or in a DC Smart Grid. LED lamps are widely known for its low-electricity consumption. The DC house application is becoming more and more popular due to its advantage of using DC generated electricity, for example from a solar photovoltaic system, directly without having to invert it into AC voltage. However, LED needs a driver to activate and control it. Its mounting also needs certain precaution to anticipate the high heat from the LED. An appropriate heatsink is required before activating the LED. The laboratory results indicate that a 3-watt LED bulb lamp can produce an efficiency up to 93.16% with luminous efficacy 82.29 lm/W. These results prove that an LED bulb consumes less energy and can give an optimal brightness.
Volume: 9
Issue: 3
Page: 987-996
Publish at: 2018-09-01

Dealing with Voters’ Privacy Preferences and Readiness in Electronic Voting

10.11591/ijeecs.v11.i3.pp994-1003
Muharman Lubis , Arif Ridho Lubis
Various countries have been encouraged to adopt electronic voting because it can reduce operational cost and time spent for tabulation process. In the current research, it has been mentioned several problem arised in term of technical aspects, voters’ trust, machine vulnerabilities and privacy right in which experts argued the election system have been compromised. In short term, the certain faction will try to exploit the system weaknesses for their own benefit, while in the long term, it can create public distrust to the government, which decrease the voters turn out, break the participation willingness and downgrade the quality of voting. Thus, the government should deal with previous issues in the election before adopting electronic approach while at the same time align with voters’ expectation to provide better election in serve citizen through comprehensive analysis. This study provide initial step to analyse the readiness of electronic voting from the social perspective in response to how Indonesia view the initiative to adopt new tech in voting system.
Volume: 11
Issue: 3
Page: 994-1003
Publish at: 2018-09-01

Investigation of The Effect of Pre-Service Classroom Teachers’ Critical Thinking Disposition on Their Media Literacy

10.11591/ijere.v7i3.13960
Özkan Çelik , Halil Çokçalişkan , Alper Yorulmaz
It is important to develop a critical perspective in terms of interpreting the messages to be given to the individuals through media and questioning the authenticity and content of these messages. It is therefore necessary to train the individuals called media literate who can critically perceive and evaluate the information conveyed through the media to increase the positive effects of the media and to reduce their negative effects as much as possible. The purpose of the current study is to investigate the effect of the pre-service teachers’ critical thinking disposition on their media literacy. The study employed the relational survey model, one of the quantitative research methods. In order to collect data, a personal information form, the Critical Thinking Disposition Scale, and the Media Literacy Level Determination Scale were used as the data collection tools. As a result of the study, the critical thinking disposition of the pre-service teachers was found to be medium and their media literacy was found to be high. The critical thinking disposition was found to be varying significantly depending on their gender and grade level; their media literacy was found to be varying depending on grade level but not on gender. There is a positive but low relationship between critical thinking disposition and media literacy and critical thinking is a significant predictor of media literacy.
Volume: 7
Issue: 3
Page: 194–202
Publish at: 2018-09-01

Hybrid-modulation-based control technique for reduction of output voltage ripples in frequency-modulated switch-mode power converters

10.11591/ijpeds.v9.i3.pp1272-1284
Deniss Stepins , Jin Huang , Janis Audze
In this paper a novel control technique for switching-frequency-modulated switch-mode power converters (SMPC) operating in discontinuous conduction mode is proposed. The use of the technique leads to significant reduction in peak-to-peak output voltage and peak currents increased due to straightforward application of switching frequency modulation (SFM). The technique is based on hybrid modulation scheme in which both switching frequency and duty ratio are modulated simultaneously by the same modulation signal. Theoretical analysis and experimental verification of the proposed technique are presented in details. Both computer simulations and experiments show that switching-frequency-modulated SMPC with the proposed control technique in comparison to SMPC without SFM has appreaciably lower conducted electromagnetic emissions, at the cost of slightly increased peak-to-peak output voltage and peak currents.
Volume: 9
Issue: 3
Page: 1272-1284
Publish at: 2018-09-01
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