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31,456 Article Results

Performance Evaluation of Heterogeneous Network Based on RED and WRED

10.11591/ijeecs.v3.i3.pp540-545
Wisam Mahmood Lafta , Saba Qasim Jabbar , Guangzhi Ma
The developing of wireless networks becomes a very important issue nowadays, since it is considered as an easy-using tool without building new infrastructure to cover a wide working area. Applying TCP protocols with the application demands are implemented this work by considering heterogeneous environment of wireless networks connecting with wired networks. The TCP congestion is critical problem is faced heterogeneous environments, this problem is appeared through sending and receiving huge data from wireless networks to wired networks and vice versa. This work is proposed a new approach of using active queue management (AQM) technique with random early detection (RED) and weight random early detection (WRED) strategies to avoid the expected congestion between the heterogeneous environments. Our simulation results show that the quality of service (QoS) is improved by reducing the queue delay and buffer usage, and by increasing the average throughput and utilizationof the system. The simulation is carried out by using OPNET software to test the proposed models for different scenarios.
Volume: 3
Issue: 3
Page: 540-545
Publish at: 2016-09-01

Local Path Planning of Mobile Robot Using Critical-PointBug Algorithm Avoiding Static Obstacles

10.11591/ijra.v5i3.pp182-189
SUBIR KUMAR DAS
Path planning is an essential task for the navigation of Autonomous Mobile Robot. This is one of the basic problems in robotics. Path planning algorithms are classified as global or local, depending on the knowledge of surrounding environment. In local path planning, the environment is unknown to the robot, and sensors are used to detect the obstacles and to avoid collision. Bug algorithms are one of the frequently used path planning algorithms where a mobile robot moves to the target by detecting the nearest obstacle and avoiding it with limited information about the environment. This proposed Critical-PointBug algorithm, is a new Bug algorithm for path planning of mobile robots. This algorithm tries to minimize traversal of obstacle border by searching few important points on the boundary of obstacle area as a rotation point to goal and end with a complete path from source to goal.
Volume: 5
Issue: 3
Page: 182-189
Publish at: 2016-09-01

Domain and Intelligence Based Multimedia Question Answering System

10.11591/ijere.v5i3.4544
Krishnamoorthi Magesh Kumar , P. Valarmathie
Multimedia question answering systems have become very popular over the past few years. It allows users to share their thoughts by answering given question or obtain information from a set of answered questions. However, existing QA systems support only textual answer which is not so instructive for many users. The user’s discussion can be enhanced by adding suitable multimedia data. Multimedia answers offer intuitive information with more suitable image, voice and video. This system includes a set of information as well as classification of question and answer, query generation, multimedia data selection and presentation. This system will take all kinds of media such as text, images, videos, and videos which will be combined with a textual answer. In a way, it automatically collects information from the user to improvising the answer. This method consists of ranking for answers to select the best answer. By dealing out a huge set of QA pairs and adding them to a database, multimedia question answering approach for users which finds multimedia answers by matching their questions with those in the database. The effectiveness of Multimedia system is determined by ranking of text, image, audio and video in users answer. The answer which is given by the user it’s processed by Semantic match algorithm and the best answers can be viewed by Naive Bayesian ranking system.
Volume: 5
Issue: 3
Page: 227-234
Publish at: 2016-09-01

Optimal Trajectory Planning of Industrial Robots using Geodesic

10.11591/ijra.v5i3.pp190-198
Pradip Kumar Sahu
This paper intends to propose an optimal trajectory planning technique using geodesic to achieve smooth and accurate trajectory for industrial robots. Geodesic is a distance minimizing curve between any two points on a Riemannian manifold. A Riemannian metric has been assigned to the workspace by combining its position and orientation space together in order to attain geodesic conditions for desired motion of the end-effector. Previously, trajectory has been planned by considering position and orientation separately. However, practically we cannot plan separately because the manipulator joints are interlinked. Here, trajectory is planned by combining position and orientation together. Cartesian trajectories are shown by joint trajectories in which joint variables are treated as local coordinates of position space and orientation space. Then, the obtained geodesic equations for the workspace are evaluated for initial conditions of trajectory and results are plotted. The effectiveness of the geodesic method validated through numerical computations considering a Kawasaki RS06L robot model. The simulation results confirm the accuracy, smoothness and the optimality of the end-effector motion. 
Volume: 5
Issue: 3
Page: 190-198
Publish at: 2016-09-01

Evaluation of a Problem Based Learning Curriculum Using Content Analysis

10.11591/ijere.v5i3.4540
Titi Savitri Prihatiningsih , Nurul Qomariyah
Faculty of Medicine UGM has implemented Problem Based Learning (PBL) since 1985. Seven jump tutorial discussions are applied. A scenario is used as a trigger to stimulate students to identify learning objectives (LOs) in step five which are used as the basis for self study in step six. For each scenario, the Block Team formulates the LOs which are informed to tutors. Tutors have to facilitate the discussion that the correct LOs are identified. This study checked the allignment of LOs formulated by the Faculty and LOs by the students. Cardiorespiratory system block is used. A content analysis is applied for this purpose. Sixteen discussion notes (DNs) written by 16 groups from one scenarios were analysed. The LOs from the tutor book and DNs were coded separately. There were eight Faculty LOs for scenario Blood Donation. None DNs were mentioned correctly. Many DNs mentioned LOs which are not in the prescribed LOs. It was clear that 16 groups of student failed to identify LOs correctly. This might affect their performance in their block exams, and also their preparedness for the subsequent blocks as they lack relevant prior knowledge.
Volume: 5
Issue: 3
Page: 205-210
Publish at: 2016-09-01

Load Carrying Assistance Device Pogo Suit

10.11591/ijra.v5i3.pp161-175
Sangram Redkar
Wearable robots including exoskeletons, powered prosthetics, and powered orthotics must add energy to the person at an appropriate time to enhance, augment, or supplement human performance. Adding energy while not being in sync with the user can dramatically hurt performance. Many human tasks such as walking, running, and hopping are repeating or cyclic tasks and a robot can add energy in sync with the repeating pattern for assistance. A method has been developed to add energy at the appropriate time to the repeating limit cycle based on a phase oscillator. The phase oscillator eliminates time from the forcing function which is based purely on the motion of the user. This approach has been simulated, implemented and tested in a robotic backpack which facilitates carrying heavy loads. The device oscillates the load of the backpack, based on the motion of the user, in order to add energy at the correct time and thus reduce the amount of energy required for walking with a heavy load. Models were developed in Working Model 2-D, a dynamics simulation software, in conjunction with MATLAB to verify theory and test control methods. The control system developed is robust and has successfully operated on different users, each with their own different and distinct gait. The results of experimental testing validated the corresponding models.
Volume: 5
Issue: 3
Page: 161-175
Publish at: 2016-09-01

Analysis of M42SP-7P on the Balinese Papyrus Script Printing Control System

10.11591/ijra.v5i3.pp199-204
Made Sudarma
Script writing art in the lives of Balinese people has a very important function, particularly in terms of writing a sacred script such as writing an inscription on copper plate, bronze, silver, and gold, by using a penknife which required a persistence, patience, skill and experience by itself, since not all Balinese people is able to do this very complicated work.  Considering the difficulty in writing a script on papyrus and the rarity of script writer experts, therefore the researcher gives appreciation on papyrus preservation and conservation. In the present time, sophisticated technology has replaced manual equipments which required a lot of manpower to be operated. Maybe also the inscription writing model with ancient language and writing has been done so many times with computer technology by using the printer as the interface for printing.  In this research the Balinese script printing tools will be designed namely a penknife using robotic technology which mimicking human hand’s motion when writing a script on papyrus. Thought the script tool printer design through robotic technology in order to write a script on palm leaves is an important role of technology as an innovation strategy that is able to create new thinking, new ideas and inovation creative products. Eventually is also expected to satisfy the user as consumer and a new creative market.
Volume: 5
Issue: 3
Page: 199-204
Publish at: 2016-09-01

Design and Implementation of Performance Metrics for Evaluation of Assessments Data

10.11591/ijere.v5i3.4545
Irfan Ahmed , Arif Bhatti
Evocative evaluation of assessment data is essential to quantify the achievements at course and program levels. The objective of this paper is to design performance metrics and respective formulas to quantitatively evaluate the achievement of set objectives and expected outcomes at the course levels for program accreditation. Even though assessment processes for accreditation are well documented but existence of an evaluation process is assumed. This work provides performance metrics such as attainment, student achievement, and x-th percentile for the evaluation of assessment data at course and program level. Then, a sample course data and uniformly distributed synthetic data are used to analyze the results from designed metrics. The primary findings of this work are twofold: (i) analysis with sample course assessment data reveals that qualitative mapping between marks obtained in assessments to the defined outcomes is essential for meaningful results, (ii) analysis with synthetic data shows that higher values of one metric does not imply higher values of the other metrics and they depend upon the obtained marks distribution. In particular, for uniformly distributed marks, achievement < attainment for meanOfUniformDistr. < averageMarks < passingT hreshold(α). Authors hope that the articulated description of evaluation formulas will help convergence to high quality standard in evaluation process.
Volume: 5
Issue: 3
Page: 235-245
Publish at: 2016-09-01

Arduino Based Paperless Queue Management System

10.12928/telkomnika.v14i3.3114
Aiman Zakwan; Universiti Teknikal Malaysia Melaka Jidin , Norfadzlia; Universiti Teknikal Malaysia Melaka Mohd Yusof , Tole; Universiti Ahmad Dahlan Sutikno
Queue management system is designed in organizing queues at service sectors like banks and post offices, which expected to have a large number of customers daily. Conventional ways of managing queues like issuing paper tickets printed with queue number, leads to several problems such as paper tickets littering and also long queueing or waiting time. Therefore, this paper presents the development of a system to manage queues more efficiently and eco-friendly. The proposed system consists of a Graphical User Interface (GUI), which is used to obtain customers’ mobile phone numbers and the processing unit, which generates the queue number and initiate the ticket to be sent to customers’ mobile phones via SMS, thus replacing the utilization of papers. Moreover, this system additional features allow customers to remotely obtain their queue number just by sending request to the system through SMS, and also reminding the upcoming customers that their turns are nearly arriving, a feature which is very useful especially for those who are waiting outside the premise. Simulations and experimental tests were conducted to ensure the reliability and the efficiency of the proposed system. The proposed system is supporting the development of sustainable green technology, and the expected increase of system efficiency may contribute in improving customers’ satisfaction.
Volume: 14
Issue: 3
Page: 839-845
Publish at: 2016-09-01

Brightness and Contrast Modification in Ultrasonography Images Using Edge Detection Results

10.12928/telkomnika.v14i3.3440
Retno; Jenderal Soedirman University Supriyanti , Suwitno; Jenderal Soedirman University Suwitno , Yogi; Jenderal Soedirman University Ramadhani , Haris Budi; Jenderal Soedirman University Widodo , Tutik Ida; Jenderal Soedirman University Rosanti
Currently, ultrasonography device become an important equipment for supporting diagnosis in diesases. Unfortunetaly, a lot of ultrasonography images do not provide enough information for supporting diagnosis especially images produced by low-resolution ultrasonography. It is caused by image quality that has been produced is inadequate because of noise. This research aims to improve image quality by modifying brightness and contrast to the edge detection algorithms. By modifying the brightness and contrast will cause the value of standard deviation of the ultrasonography image is lowered. Raising setting values will cause deviation standard value becomes smaller, and also the result of standard deviation is inversely proportional to the value of RMSE.  The results show that this modification can improve image quality by reducing noise significantly.
Volume: 14
Issue: 3
Page: 1090-1098
Publish at: 2016-09-01

H-Infinity Control for Pitch-Roll AR.Drone

10.12928/telkomnika.v14i3.3748
Agung; University of Surabaya Prayitno , Veronica; University of Surabaya Indrawati , Clark; University of Surabaya Arron
This paper describes the design and implementation of H-infinity controller applied to the AR.Drone to follow a given trajectory. The trajectory will be achieved by using two control signals, pitch and roll. Pitch and roll of the AR.Drone models are obtained by assuming that the transfer function of internal control for pitch and roll is the second order system. Two schemes of H-infinity controller designed for pitch and roll. H-infinity control for x-position has exogenous input of the x-reference, xref, control input of pitch value, exogenous output in the form of x-position and process output as error x. While H-infinity control for y-position has exogenous input of y-reference, yref, control input in the form of roll value, exogenous output of y-position and process output as error y. The results of simulation and implementation show that drone can follow multiple references of trajectories given.
Volume: 14
Issue: 3
Page: 963-973
Publish at: 2016-09-01

Sensitivity Analysis and Comparison between 25 kW Parabolic Dish System

10.12928/telkomnika.v14i3.4056
Mohd Ruddin; Universiti Teknikal Malaysia Melaka Ab Ghani , Liaw Geok; Universiti Teknikal Malaysia Melaka Pheng , Chin Kim; Universiti Teknikal Malaysia Melaka Gan , Tole; Universitas Ahmad Dahlan Sutikno
Dish-Stirling concentrating solar power systems is an efficient and reliable source of renewable energy. In this paper, the proposed model showed the idea of Parabolic Dish (PD) systems with control system model which vary the amount of working gas in the Stirling engine. The control systems were designed using Matlab /Simulink 2012a. Based on the developed linearized model, an improved temperature controller with transient droop characteristic and Mean Pressure Control (MPC) has been proposed. This temperature controller was effective in reducing the temperature and improving performance of the PD system. The overall performance of the system improved more than 78% in output power and energy. Besides, the system improved in term of sensitivity compared with the PD system without compensated. In addition, thermal losses decreased to 97.6% which is directly have significant improvement for the output efficiency to the system. The analysis shows that the PD system is feasible in term of technical but not economically feasible in the Malaysia environment.
Volume: 14
Issue: 3
Page: 807-814
Publish at: 2016-09-01

Optimization of Hydrogen-fueled Engine Ignition Timing Based on L-M Neural Network Algorithm

10.12928/telkomnika.v14i3.2756
Lijun; North China University of Water Resources and Electric Power Wang , Yuan; North China University of Water Resources and Electric Power Liu , Yahui; North China University of Water Resources and Electric Power Liu , Wei; North China University of Water Resources and Electric Power Wang , Yanan; North China University of Water Resources and Electric Power Zhao , Zhenzhong; North China University of Water Resources and Electric Power Yang
In view of the improvement measures of the optimization control algorithm for the ignition system of the hydrogen-fueled engine, the L-M neural network algorithm, Powell neural network algorithm and the traditional BP neural network algorithm are used to optimize the ignition system. The results showed that L-M algorithm not only can accurately predict the hydrogen-fueled engine ignition timing, but also has high precision, high convergence speed, a simple model and other outstanding advantages in the training process, which can greatly reduce the workload of human engine bench tests. Only a small amount of engine bench test is carried out, and the obtained sample data can be used to predict the ignition timing under the whole working conditions. The mean square error of the optimization results based on L-M algorithm arrives at 0.0028 after 100 times of calculation, the maximum value of absolute error arrives at 0.2454, and the minimum value of absolute error arrives at 0.00426.
Volume: 14
Issue: 3
Page: 923-932
Publish at: 2016-09-01

Research on Optimization Strategy to Data Clustered Storage of Consistent Hashing Algorithm

10.12928/telkomnika.v14i3.3550
Ningjia; Changchun University of Science and Technology Qiu , Xiaojuan; Jilin University Hu , Peng; Changchun University of Science and Technology Wang , Huamin; Changchun University of Science and Technology Yang
This paper has been withdrawed due to has major technical problems.---------------------------------------------------------------------This paper presents a consistent hashing data optimize multiple copy distributed clustered storage placement strategy, using technology to create a virtual node and aliquots storage area to ensure the balanced distribution of data storage. With the speed of data processing accelerated, it is possible for clusters actual required to complete the expansion, and complete the development of adaptive optimization. Experiments show that the execution speed has effectively improved to ensure the load balance. With possible extensions and reducing problems treatment in actual situation, oscillation has little impact on the load balancing, and the execution time is consistent with the proportion of the load trends.
Volume: 14
Issue: 3
Page: 824-830
Publish at: 2016-09-01

The Design and Performance Analysis of DTMB System

10.12928/telkomnika.v14i3.3830
Emy; Gunadarma University Haryatmi , Tubagus Maulana; Gunadarma University Kusuma , Busono; Gunadarma University Soerowirdjo , Purnawarman; Gunadarma University Musa
Various standard in digital television broadcasting system has been developed in the world, one of which is the Digital Terrestrial Multimedia Broadcasting, or abbreviated as DTMB that currently used by China and Hong Kong. DTMB has several standard configurations and parameters. In this research, DTMB system was designed and the results was validated through simulation using computer program, named Simulink. The parameters used in this research is the FEC with code rate of 0.4, 4QAM modulation, interleaver mode 1 and using a single carrier transmission mode. Stream format used in the simulation was MPEG2-TS as the input for DTMB system. Parameters selection was based on low implementation complexity, but with good results. Two important things in DTMB system is the existence of FEC and TDS-OFDM. FEC consists of cascaded BCH as the outer encoder/decoder (codec) and LDPC as the inner codec. The reason of using TDS-OFDM because it provides better picture quality when the receiver is in motion. The test results have shown that for static video, DTMB was able to receive video with identical quality compared to the original video, when the value of SNR=11dB and SNR=12dB for dynamic video. It is shown that after going through the process from LDPC to BCH, the number of bit errors decreased while the value of SNR increased.
Volume: 14
Issue: 3
Page: 873-879
Publish at: 2016-09-01
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