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28,451 Article Results

Packet Loss Rate Differentiation in slotted Optical Packet Switching OCDM/WDM

10.12928/telkomnika.v15i3.5019
Omar; Universiti Sains Islam Malaysia Najah , Kamaruzzaman; Universiti Sains Islam Malaysia Seman , Khairi; Universiti Sains Islam Malaysia Abdulrahim
We propose a multi-class mechanism for Optical Code Division Multiplexing (OCDM), Wavelength Division Multiplexing (WDM) Optical Packet Switch (OPS) architecture capable of supporting Quality of Service (QoS) transmission. OCDM/WDM has been proposed as a competitive hybrid switching technology to support the next generation optical Internet. This paper addresses performance issues in the slotted OPS networks and proposed four differentiation schemes to support Quality of Service. In addition, we present a comparison between the proposed schemes as well as, a simulation scheduler design which can be suitable for the core switch node in OPS networks. Using software simulations the performance of our algorithm in terms of losing probability, the packet delay, and scalability is evaluated.
Volume: 15
Issue: 3
Page: 1061-1071
Publish at: 2017-09-01

Using SVD and DWT Based Steganography to Enhance the Security of Watermarked Fingerprint Images

10.12928/telkomnika.v15i3.6437
Mandy; Institute of Technology Letterkenny Douglas , Karen; Institute of Technology Letterkenny Bailey , Mark; Institute of Technology Letterkenny Leeney , Kevin; Ulster University Curran
Watermarking is the process of embedding information into a carrier file for the protection of ownership/copyright of digital media, whilst steganography is the art of hiding information. This paper presents, a hybrid steganographic watermarking algorithm based on Discrete Wavelet Transform (DWT) and Singular Value Decomposition (SVD) transforms in order to enhance the security of digital fingerprint images. A facial watermark is embedded into fingerprint image using a method of singular value replacement. First, the DWT is used to decompose the fingerprint image from the spatial domain to the frequency domain and then the facial watermark is embedded in singular values (SV’s) obtained by application of SVD. In addition, the original fingerprint image is not required to extract the watermark. Experimental results provided demonstrate the methods robustness to image degradation and common signal processing attacks, such as histogram and filtering, noise addition, JPEG and JPEG2000 compression with various levels of quality.
Volume: 15
Issue: 3
Page: 1368-1379
Publish at: 2017-09-01

Brown’s Weighted Exponential Moving Average Implementation in Forex Forecasting

10.12928/telkomnika.v15i3.5410
Seng; Universitas Multimedia Nusantara Hansun , Subanar; Universitas Gadjah Mada Subanar
In 2016, a time series forecasting technique which combined the weighting factor calculation formula found in weighted moving average with Brown’s double exponential smoothing procedures had been introduced. The technique is known as Brown’s weighted exponential moving average (B-WEMA), as a new variant of double exponential smoothing method which does the exponential filter processes twice. In this research, we will try to implement the new method to forecast some foreign exchange, or known as forex data, including EUR/USD, AUD/USD, GBP/USD, USD/JPY, and EUR/JPY data. The time series data forecasting results using B-WEMA then be compared with other conventional and hybrid moving average methods, such as weighted moving average (WMA), exponential moving average (EMA), and Brown’s double exponential smoothing (B-DES). The comparison results show that B-WEMA has a better accuracy level than other forecasting methods used in this research.
Volume: 15
Issue: 3
Page: 1425–1432
Publish at: 2017-09-01

An Upgraded Transverse Electromagnetic Parallel Plates for Dielectric Measurement

10.12928/telkomnika.v15i3.7213
S.; Universiti Tun Hussein Onn Malaysia K. Yee , R.; Universiti Tun Hussein Onn Malaysia Padu , C.; Universiti Tun Hussein Onn Malaysia K. Sia , X.; Universiti Tun Hussein Onn Malaysia T. I. Ngu , S.; Universiti Tun Hussein Onn Malaysia H. Dahlan , M.; Universiti Tun Hussein Onn Malaysia A. Azlan
A new version of transverse electromagnetic parallel plates with irregular plates’ width and plate separation has been developed for dielectric measurement. The separations between the plates are supported by four rectangular Teflon block and 1 mm of groove is proposed at the center of the upper plate to maintain the measurement repeatability. The groove enables the samples which are slightly higher than 2 cm to be fitted well between the plates without introducing extra force to the plates. Theperformance of both parallel plates has been compared in the frequency range from 100 MHz to 1.1 GHz. It is found that the upgraded parallel plate offers better return loss and insertion loss above 500 MHz compared to the previous parallel plate. It is reported from this work that the return loss of the parallel plate must be lower than -15 dB in order to achieve accurate dielectric constant. However, the insertion loss of the parallel plates does not influence the real permeability significantly. The upgraded TEM parallel plateproduces a consistent reading with a standard deviation of less than 0.05 above frequency 200 MHz. The dielectric measurement of Polypropylene (PP) has proven the capability of this upgraded TEM parallelplate.
Volume: 15
Issue: 3
Page: 1446-1453
Publish at: 2017-09-01

Use of Automation Codecs Streaming Video Applications Based on Cloud Computing

10.12928/telkomnika.v15i3.2810
Hero; Sekolah Tinggi Teknologi Adisutjipto Wintolo , Anggraini; Sekolah Tinggi Teknologi Adisutjipto Kusumaningrum , Handoko Widya; Sekolah Tinggi Teknologi Adisutjipto Kusuma
Streaming technology is currently experiencing a great progress. Faster internet more users streaming. Streaming services that exist today there are still weaknesses in both the upload speed, streaming speed and limited types of video extensions that can be played. To resolve these problems then made a video streaming service based local area network with a system of cloud computing that can work effectively in terms of upload speeds, streaming and variations in video formats. Video streaming application is classified as a service IaaS (Infrastructure as a Service Cloud) in cloud computing. On the use of streaming applications the user does not need to convert the video, with the purpose of uploading process can be faster and applications can play a variety of video formats.
Volume: 15
Issue: 3
Page: 1409–1415
Publish at: 2017-09-01

Wireless Body Area Networks for Healthcare Applications: An Overview

10.12928/telkomnika.v15i3.5793
Muhammad; Universiti Teknologi Malaysia Anwar , Abdul Hanan; Universiti Teknologi Malaysia Abdullah , Kashif Naseer; Bahria University Qureshi , Abdul Hakeem; Universiti Teknologi Malaysia Majid
Healthcare systems have been facing various new challenges due to increasing and rising aging population in healthcare. Advance information and communication technologies have introduced Wireless Body Area Networks (WBANs) for healthcare systems. WBANs provide different monitoring services in healthcare sector for monitoring their patients with more convenience. WBANs are economical solutions and non-invasive technology for healthcare applications. This review paper provides a comprehensive review on WBANs applications, services and recent challenges.
Volume: 15
Issue: 3
Page: 1088-1095
Publish at: 2017-09-01

New Miniature Planar Microstrip Antenna Using DGS for ISM Applications

10.12928/telkomnika.v15i3.6864
R.; University of Hassan 1st Settat Er-rebyiy , J.; University of Hassan 1st Settat Zbitou , M.; Microwave Group ESEO Angers Latrach , A.; University of Hassan 1st Settat Tajmouati , A.; University of Hassan 1st Settat Errkik , L. EL; University of Hassan 1st Settat Abdellaoui
The aim of this paper is to use defected ground structures (DGS) in order to miniaturize a microstrip patch antenna. The DGS structure is integrated in the ground plane to improve the performance of the planar antenna, and shifted the resonance frequency from 5.8 GHz to 2.5 GHz, with a miniaturization up to 83%. The antenna is designed, optimized, and miniaturized by using the CST MW-studio, mounted on an FR-4 substrate having a dielectric constant 4.4, a loss tangent tan (ɸ)=0.025, thickness of 1.6 mm with the whole area of 34X34 mm2.The proposed antenna is suitable for ISM (Industrial, Scientific and Medical) applications at 2.5 GHz with S11 ≤(-10) dB. The antenna is fed by 50ohm input impedance and it has good performances in terms of matching input impedance and radiation pattern. The proposed antenna was fabricated and tested.Simulation and measurement results are in good agreement. 
Volume: 15
Issue: 3
Page: 1149-1154
Publish at: 2017-09-01

Predicting the Presence of Learning Motivation in Electronic Learning: A New Rules to Predict

10.12928/telkomnika.v15i3.4286
Christina; STEI-Institut Teknologi Bandung Juliane , Arry A.; STEI-Institut Teknologi Bandung Arman , Husni S.; STEI-Institut Teknologi Bandung Sastramihardja , Iping; STEI-Institut Teknologi Bandung Supriana
Research affirms that electronic learning (e-learning) has a great deal of advantages to learning process, it’s provides learners with flexibility in terms of time, place, and pace. That easiness was not be a guarantee of a good learning outcomes though they got the same learning material and course, because the fact is the outcomes was not the same from one to another and even not satisfy enough. One of prerequisite to the successful of e-learning process is the presence of learning motivation and it was not easy to identify. We propose a novel model to predicting the presence of learning motivation in e-learning using those attributes that have been identified in previous research. This model has been built using WEKA toolkit by comparing fourteen algorithms for Tree Classifier and ten-fold cross validation testing methods to process 3.200 of data sets. The best accuracy reached at 91.1% and identified four parameters to predict the presence of learning motivation in e-learning, and aim to assist teachers in identify whether student needs motivation or does not. This study also confirmed that Tree Classifier still has the best accuracy to predict and classify academic performance, it was reached average 90.48% for fourteen algorithm for accuracy value.
Volume: 15
Issue: 3
Page: 1223-1229
Publish at: 2017-09-01

Thermal Condition and Losses in Ultra-High-Speed Generators

10.12928/telkomnika.v15i3.6365
Flur; Ufa State Aviation Technical University Ismagilov , Viacheslav; Ufa State Aviation Technical University Vavilov , Ruslan; Ufa State Aviation Technical University Karimov , Denis; Ufa State Aviation Technical University Gusakov
In this paper ultra-high-speed generators operated in intermittent periodic and short-term mode were considered. Experimental studies of losses depending on frequencies in the magnetic core of microelectromechanical energy converters made from amorphous steel were made. Dependence of the flux density from the temperature in the air gap of the experimental layout of high-coercivity permanent magnets was obtained. Computer modeling of the magnetic field distribution on the cross section of the stator magnetic core of microelectromechanical energy converters were made in the software package Ansoft Maxwell. Dependence of friction losses of the rotor around the air from the air temperature was obtained. Comparisons of losses and efficiency of microelectromechanical energy converters in a cold state and after 10 minutes of operation without cooling were made.
Volume: 15
Issue: 3
Page: 995-1002
Publish at: 2017-09-01

Enhanced Payload Data Reduction Approach for Cluster Head (CH) Nodes

10.12928/telkomnika.v15i3.7217
N.; Universiti Tun Hussein Onn Malaysia (UTHM) A. M. Alduais , J.; Universiti Tun Hussein Onn Malaysia (UTHM) Abdullah , A.; Universiti Tun Hussein Onn Malaysia (UTHM) Jamil
In this paper, we suggested two approaches to minimizing the CH packet size by considering the accuracy of prediction of sensed data at the base station. The proposed coding schemes based relative difference (CS-RD) and based the factor of precision (CS-FP) instead of the absolute change method that has been used in recent work. The aim is to enhance the accuracy of prediction data at the base station. Therefore, the performance metric was evaluated in term of the accuracy of prediction data at the base station. Simulation results showed that the proposed approaches performed better in term of the accuracy of prediction data at the base station. Specifically, the distortion percentage and average Absolut error in the CS-RD and CS-FP method decreased by 50% and 88% better than the current new aggregation method (ADATDC). However, our proposed CS-FP showed a low reduction ratio for some states.
Volume: 15
Issue: 3
Page: 1477-1484
Publish at: 2017-09-01

Managers Perceptions towards the Success of E-performance Reporting System

10.12928/telkomnika.v15i3.5133
A'ang; Syarif Hidayatullah State Islamic University Jakarta Subiyakto , Ditha; Syarif Hidayatullah State Islamic University Jakarta Septiandani , Evy; Syarif Hidayatullah State Islamic University Jakarta Nurmiati , Yusuf; Syarif Hidayatullah State Islamic University Jakarta Durachman , Mira; International Islamic University Malaysia Kartiwi , Abd. Rahman; International Islamic University Malaysia Ahlan
Managers are the key informants in the information system (IS) success measurements. In fact, besides the determinant agents are rarely involved in the assessments, most of the measurements are also often performed by the technical stakeholders of the systems. Therefore, the results may questionable. This study was carried to explain the factors that influence the success of an e-performance reporting system in an Indonesian university by involving ± 70% of the managers (n=66) in the sampled institution. The DeLone and McLean model was adopted and adapted here following the suggestions of the previous meta-analysis studies. The collected data was analyzed using the partial least squares-structural equation modelling (PLS-SEM) for examining the four hypotheses. Despite the findings revealed acceptances of the overall hypotheses, the weak explanation of the user satisfaction variable towards the net benefit one had been the highlighted point. Besides the study limitations, the point may also be the practical and theoretical considerations for the next studies, especially for the IS success studies in Indonesia
Volume: 15
Issue: 3
Page: 1389-1396
Publish at: 2017-09-01

Foreign Tourist Arrivals Forecasting Using Recurrent Neural Network Backpropagation through Time

10.12928/telkomnika.v15i3.5993
Wayan Oger; Udayana University Vihikan , I Ketut Gede; Udayana University Darma Putra , I Putu Arya; Udayana University Dharmaadi
Bali as an icon of tourism in Indonesia has been visited by many foreign tourists. Thus, Bali is one of the provinces that contribute huge foreign exchange for Indonesia. However, this potential could be threatened by the effectuation of the ASEAN Economic Community as it causes stricter competition among ASEAN countries including in tourism field. To resolve this issue, Balinese government need to forecast the arrival of foreign tourist to Bali in order to help them strategizing tourism plan. However, they do not have an appropriate method to do this. To overcome this problem, this study contributed a forecasting method using Recurrent Neural Network Backpropagation Through Time. We also compare this method with Single Moving Average method. The results showed that proposed method outperformed Single Moving Average in 10 countries tested with 80%, 70%, and 70% better MSE results for 1, 3 and 6 months ahead forecast respectively.
Volume: 15
Issue: 3
Page: 1257-1264
Publish at: 2017-09-01

An Fundamental Current Reference Control Strategy for DSTATCOM under Various Load Situations

10.11591/ijeecs.v7.i3.pp606-616
Sri Prakash CH
Effort for power quality enhancement is gradually raised in power transmission and distribution system. In a distribution system, it is a pre-requisite consumer related concern which is addressed by evading the mis-operation of massive power electronic load apparatus. Due to this, voltage/current harmonic distortions are acquired at common coupling point, which influences the disruption of quality power in a distribution system. A reliable and efficient active power conditioner is utilized for acquiring the power quality features in a three phase distribution system with attractive control objective. Over the classical conditioning techniques, a D-STATCOM plays a key role in a distribution system for power quality enhancement. Formal control objectives are adversed with incredible switching losses due to extreme harmonized frequencies in a reference current component. This paper proposes the imperative reference current extraction scheme for optimal functioning of DSTATCOM with reduced switching losses and gaining the incredible efficiency. The validation of DSTATCOM with proposed control strategy under several load situations (linear/non-linear & balanced/un-balanced) is evaluated by using Matlab/Simulink platform and simulation results are conferred.
Volume: 7
Issue: 3
Page: 606-616
Publish at: 2017-09-01

Research and Application of Development Model of Information Service for IOT of Oil and Gas Production Based on Cloud Architecture

10.12928/telkomnika.v15i3.5510
Wu; Research Institute of Petroleum Exploration & Development-Northwest Haili , Gong; Research Institute of Petroleum Exploration & Development-Northwest Renbin , Wang; Research Institute of Petroleum Exploration & Development-Northwest Congbin , Gong; Research Institute of Petroleum Exploration & Development-Northwest Lei
On completion of oil and gas production IOT system application system needs expanding and secondary problems such as software development integration service, this paper proposes a scalable cloud platform(called A11-PaaS) based on middleware and ESB(Enterprise service bus). The platform realizes that managmant of ESB, controls the service request access on the ESB with the LDAP, use the WAS profile as a sandbox for the development, combine with the Maven plug-in and Nexus, realize the unified management of the secondary development, testing, and deployment of the new system and achieve the purpose of rapid development. The platform has been deployed in some oil company, the experimental results show that this technology has achieved rapid development, integrated the web service from IOT system, and provide effective method to integrate other application system.
Volume: 15
Issue: 3
Page: 1416–1424
Publish at: 2017-09-01

Improving DNA Barcode-based Fish Identification System on Imbalanced Data using SMOTE

10.12928/telkomnika.v15i3.5011
Wisnu Ananta; Department of Computer Science, Bogor Agricultural University Kusuma , Nurdevi; Department of Computer Science, Bogor Agricultural University Noviana , Lailan Sahrina; Department of Computer Science, Bogor Agricultural University Hasibuan , Mala; Department of Aquatic Product Technology, Bogor Agricultural University Nurilmala
Problem in imbalanced data is very common in classification or identification. The problem is raised when the number of instances of one class far exceeds the other. In the previous research, our DNA barcode-based Identification System of Tuna and Mackerel was developed in imbalanced dataset. The number of samples of Tuna and Mackerel were much more than those of other fish samples. Therefore, the accuracy of the classification model was probably still in bias. This research aimed at employing Synthetic Minority Oversampling Technique (SMOTE) to yield balanced dataset. We used k-mers frequencies from DNA barcode sequences as features and Support Vector Machine (SVM) as classification method. In this research we used trinucleotide (3-mers) and tetranucleotide (4-mers). The training dataset was taken from Barcode of Life Database (BOLD). For evaluating the model, we compared the accuracy of model using SMOTE and without SMOTE in order to classify DNA barcode sequences which is taken from Department of Aquatic Product Technology, Bogor Agricultural University. The results showed that the accuracy of the model in the species level using SMOTE was 7% and 13% higher than those of non-SMOTE for trinucleotide (3-mers) and tetranucleotide (4-mers), respectively. It is expected that the use of SMOTE, as one of data balancing technique, could increase the accuracy of DNA barcode based fish classification system, particularly in the species level which is difficult to be identified.
Volume: 15
Issue: 3
Page: 1230-1238
Publish at: 2017-09-01
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