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28,593 Article Results

Weighted Round Robin Load Balancer to Enhance Web Server Cluster in OpenFlow Networks

10.12928/telkomnika.v16i3.5601
Yuggo; Bogor Agricultural University Afrianto , Heru; Bogor Agricultural University Sukoco , Sri; Bogor Agricultural University Wahjuni
Web server clusters require a reliable network management for increasing the quality of service (QoS). A load balancer system installed in a software-defined network (SDN) is one method that can improve the performance and availability of web server services. SDN is a dynamic and a programmable network management approach, and one protocol that supports it is OpenFlow. This research aims to design and analyse a model of a load balancer on OpenFlow networks, implementing a Weighted Round Robin (WRR) algorithm. The analysis process is conducted by measuring the value of a QoS web server performance parameters, such as response time, throughput, HTTP success, and loss connection. The results showed the WRR algorithm can be implemented for balancing a network system with dynamic resource allocation. The weight workload of each service can be obtained from the needs and existing network resources. The performance of a load balancer on an OpenFlow network is 57% better than in a traditional one for testing of response time conducted in a high connection. However, the throughput and HTTP success connection decreased by 2% and 10%, respectively, while HTTP loss connection increased by 49%.
Volume: 16
Issue: 3
Page: 1402-1408
Publish at: 2018-06-01

Energy Consumption Saving in Embedded Microprocessors Using Hardware Accelerators

10.12928/telkomnika.v16i3.9387
Gian Carlo; University of Rome Tor Vergata Cardarilli , Luca Di; University of Rome Tor Vergata Nunzio , Rocco; University of Rome Tor Vergata Fazzolari , Marco; University of Rome Tor Vergata Re , Francesca; University of Rome Tor Vergata Silvestri , Sergio; University of Rome Tor Vergata Spanò
This paper deals with the reduction of power consumption in embedded microprocessors. Computing power and energy efficiency are becoming the main challenges for embedded system applications. This is, in particular, the caseof wearable systems. When the power supply is provided by batteries, an important requirement for these systems is the long service life. This work investigates a method for the reduction of microprocessor energy consumption, based on the use of hardware accelerators. Their use allows to reduce the execution time and to decrease the clock frequency, so reducing the power consumption. In order to provide experimental results, authors analyze a case of study in the field of wearable devices for the processing of ECG signals. The experimental results show that the use of hardware accelerator significantly reduces the power consumption.
Volume: 16
Issue: 3
Page: 1019-1026
Publish at: 2018-06-01

Development of a Wireless Power Transfer Circuit Based on Inductive Coupling

10.12928/telkomnika.v16i3.7686
Supriyadi; Politeknik Negeri Bandung Supriyadi , Edi; Politeknik Negeri Bandung Rakhman , Suyanto; Politeknik Negeri Bandung Suyanto , Arif; Politeknik Negeri Bandung Rahman , Noor Cholis; Politeknik Negeri Bandung Basjaruddin
Wireless electrical energy transfer has many advantages over the same through conducting cables. This research focusses on developing wireless power transfer circuitusing inductive coupling. The experiment has been done by changing the number of turns and the diameter of the wire of a coil with the aim of finding the maximum power and the longest distancethat the energy can be transferred through wireless means. The power source is connected to a series of electronics components and a copper coil which form the primary source for the transmitter the power receiver consists of a copper coil, a rectifier and the load. In a system with the diameter of the wires of the two coils is0.5 mm, and the number of turns is 26 at the frequency of 470KHz the efficiency of power transfer about 1.51% at a distance of 1 cm. The transferred energy by wireless means could operate a 1 Watt LED at 1 cm.
Volume: 16
Issue: 3
Page: 1013-1018
Publish at: 2018-06-01

Security Solutions Using Brain Signals

10.11591/ijai.v7.i2.pp105-110
Anupama. H.S , Anusha M , Aparna Joshi , Apoorva N , N.K. Cauvery , Lingaraju. G.M
A Brain Computer Interface is a direct neural interface or a brain–machine interface. It provides a communication path between human brain and the computer system. It aims to convey people's intentions to the outside world directly from their thoughts. This paper focuses on current model which uses brain signals for the authentication of users. The Electro- Encephalogram (EEG) signals are recorded from the neuroheadset when a user is shown a key image (signature image). These signals are further processed and are interpreted to obtain the thought pattern of the user to match them to the stored password in the system. Even if other person is presented with the same key image it fails to authenticate as the cortical folds of the brain are unique to each human being just like a fingerprint or DNA.
Volume: 7
Issue: 2
Page: 105-110
Publish at: 2018-06-01

K Means Clustering and Meanshift Analysis for Grouping the Data of Coal Term in Puslitbang tekMIRA

10.12928/telkomnika.v16i3.8910
Rolly Maulana; Politeknik Pos Indonesia Awangga , Syafrial Fachri; Politeknik Pos Indonesia Pane , Khaera; Politeknik Pos Indonesia Tunnisa , Iping Supriana; Institut Teknologi Bandung Suwardi
Indonesian government agencies under the Ministry of Energy and Mineral Resources have problems in classifying data dictionary of coal. This research conduct grouping coal dictionary using K-Means and MeanShift algorithm. K-means algorithm is used to get cluster value on character and word criteria. The last iteration of Euclidian distance calculation data on k-means combine with Meanshift algorithm. The meanshift calculates centroid by selecting different bandwidths. The result of grouping using k-means and meanshift algorithm shows different centroid to find optimum bandwidth value. The data dictionary of this research has sorted in alphabetically.
Volume: 16
Issue: 3
Page: 1351-1357
Publish at: 2018-06-01

Analysis the Effect of Control Factors Optimization on the Threshold Voltage of 18 nm PMOS Using L27 Taguchi Method

10.11591/ijeecs.v10.i3.pp934-942
Norani Atan , Burhanuddin Yeop Majlis , Ibrahin Ahmad , K. H. Chong
This research paper is about the investigation of Halo Implantation, Halo Implantation Energy, Halo Tilt, Compensation Implantation and Source/Drain Implantation. They are types of control factors that used in achievement of the threshold voltage value. To support the successfully of the threshold voltage (VTH) producing, Taguchi method by using L27 orthogonal array was used to optimize the control factors variation. This analysis has involved with 2 main factors which are break down into five control factors and two noise factors. The five control factors were varied with three levels of each and the two noise factors were varied with two levels of each in 27 experiments. In Taguchi method, the statistics data of 18 nm PMOS transistor are from the signal noise ratio (SNR) with nominal-the best (NTB) and the analysis of variance (ANOVA) are executed to minimize the variance of threshold voltage. This experiment implanted by using Virtual Wafer Fabrication SILVACO software which is to design and fabricate the transistor device. Experimental results revealed that the optimization method is achieved to perform the threshold voltage value with least variance and the percent, which is only 2.16%. The threshold voltage value from the experiment shows -0.308517 volts while the target value that is -0.302 volts from value of International Technology Roadmap of semiconductor, ITRS 2012. The threshold voltage value for 18 nm PMOS transistor is well within the range of -0.302 ± 12.7% volts that is recommendation by the International Roadmap for Semiconductor prediction 2012.
Volume: 10
Issue: 3
Page: 934-942
Publish at: 2018-06-01

Age Constraints Effectiveness on the Human Community Based Genetic Algorithm (HCBGA)

10.11591/ijai.v7.i2.pp78-82
Nagham A. Al-Madi , Amnah A. El-Obaid
In this paper, we use under-age constraints and apply it to the Traveling Salesman Problem (TSP). Values and results concerning the averages and best fits of both, the Simple Standard Genetic Algorithm (SGA), and an improved approach of Genetic Algorithms named Human Community Based Genetic Algorithm (HCBGA) are being compared. Results from the TSP test on Human Community Based Genetic Algorithm (HCBGA) are presented. Best fit solutions towards slowing the convergence of solutions in different populations of different generations show better results in the Human Community Based Genetic Algorithm (HCBGA) than the Simple Standard Genetic Algorithm (SGA).
Volume: 7
Issue: 2
Page: 78-82
Publish at: 2018-06-01

Wavelet Based Feature Extraction for The Indonesian CV Syllables Sound

10.12928/telkomnika.v16i3.5014
Domy; Universitas Gadjah Mada Kristomo , Risanuri; Universitas Gadjah Mada Hidayat , Indah; Universitas Gadjah Mada Soesanti
This paper proposes the combined methods of Wavelet Transform (WT) and Euclidean Distance (ED) to estimate the expected value of the possibly feature vector of Indonesian syllables. This research aims to find the best properties in effectiveness and efficiency on performing feature extraction of each syllable sound to be applied in the speech recognition systems. This proposed approach which is the state-of-the-art of the previous study consist of three main phase. In the first phase, the speech signal is segmented and normalized. In the second phase, the signal is transformed into frequency domain by using the WT. In the third phase, to estimate the expected feature vector, the ED algorithm is used. Th e result shows the list of features of each syllables can be used for the next research, and some recommendations on the most effective and efficient WT to be used in performing syllable sound recognition.
Volume: 16
Issue: 3
Page: 925-933
Publish at: 2018-06-01

Latin-to-Balinese Script Transliteration Method on Mobile Application: A Comparison

10.11591/ijeecs.v10.i3.pp1331-1342
Gede Indrawan , I Ketut Paramarta , Ketut Agustini , Sariyasa Sariyasa
Balinese script writing, as one of Balinese cultural richness, is going to extinct because of its decreasing use. This research is a way to preserve it through collaboration between Computer Science and Language discipline, that focused on accuracy comparison of Latin-to-Balinese script transliteration method on mobile application as a ubiquitous learning media. From few research in this area, there are only two existing methods to be compared, i.e. each on Android mobile application that were called Belajar Aksara Bali (BAB), and Transliterasi Aksara Bali (TAB). The comparison was based on The Balinese Alphabet writing rules and examples document by Sudewa. Through the experiment, TAB has outperformed BAB since TAB has passed over 68% (103 of 151) cases, while BAB has passed over only 39% (59 of 151) cases. This research contributes on a comprehensive accuracy comparison analysis of Latin-to-Balinese script transliteration method, specifically on mobile application, since there is no such study. This research also contributes on those methods improvement possibility. In the future, this research can be used as a reference for improvement of any Latin-to-Balinese script transliteration method by taking care on thirteen kind of special words that were found during this comparison study.
Volume: 10
Issue: 3
Page: 1331-1342
Publish at: 2018-06-01

Lessons Learned from the Quality of Experience (QoE) Assessment of 4G Mobile Technology in Indonesia

10.11591/ijeecs.v10.i3.pp1203-1211
Muhammad Suryanegara , Fery Andriyanto , Ajib Setyo Arifin
The purpose of this research is to assess the quality of experience (QoE) of 4G mobile technology that is used in the Indonesian market. The study analyzed the results obtained and discussed the lesson learned for stakeholders of the telecommunications industry. Primary data was obtained by conducting a market survey in May 2017, with a confidence level of 95%, representing the 4G subscribers in the Indonesia market. There are three main subjective aspects of QoE: service quality, data speed, and network quality (indicated by stability of signal). The analyses were conducted based on ACR-HR score, comparing users’ experiences of 4G with their previous 3G subscriptions. It was found that, in general, the Indonesian market perceived 4G as offering a better experience than 3G. However, one of the important lessons that can be learned is that network operators should provide a more stable signal, as the market gave a lower score for this aspect.
Volume: 10
Issue: 3
Page: 1203-1211
Publish at: 2018-06-01

Integration Method of Local-global SVR and Parallel Time Variant PSO in Water Level Forecasting for Flood Early Warning System

10.12928/telkomnika.v16i3.6772
Arief Andy; Universitas Brawijaya Soebroto , Imam; Universitas Brawijaya Cholissodin , Maria Tenika; Universitas Brawijaya Frestantiya , Ziya El; Universitas Brawijaya Arief
Flood is one type of natural disaster that can’t be predicted, one of the main causes of flooding is the continuous rain (natural events). In terms of meteorology, the cause of flood is come from high rainfall and the high tide of the sea, resulting in increased the water level. Rainfall and water level analysis in each period, still not able to solve the existing problems. Therefore in this study, the proposed integration method of Parallel Time Variant PSO (PTVPSO) and Local-Global Support Vector Regression (SVR) is used to forecast water level. Implementation in this study combine SVR as regression method for forecast the water level, Local-Global concept take the role for the minimization for the computing time, while PTVPSO used in the SVR to obtain maximum performance and higher accurate result by optimize the parameters of SVR. Hopefully this system will be able to solve the existing problems for flood early warning system due to erratic weather.
Volume: 16
Issue: 3
Page: 1193-1200
Publish at: 2018-06-01

Pico-hydro Electrification from Rainwater’s Gravitational Force for Urban Area

10.12928/telkomnika.v16i3.8076
M Faizal; Universiti Teknikal Malaysia Melaka Yaakub , M Farriz; Universiti Teknikal Malaysia Melaka Basar , F Hanim Mohd; Universiti Tun Hussien Onn Malaysia Noh , Hambali; Universiti Teknikal Malaysia Melaka Boejang
The demand for electrical energy is increasing in most areas in the world. Unstable fossil fuel price and its rapid depletion have led to an intensive research on new energy source and energy conversion. This paper presents the performance of the energy harvesting which focuses on the experimental work to emulate energy harvesting from the rainwater by utilizing a Pico - hydro approach installed to a high building. NACuM core DB-370F DC generators, 1000 litres water tank, 0.5 inch diameter piping system used in two different configurations with three different head setups. The result shows a huge energy harvesting potential obtained from the system and rainwater with maximum 261 milliwatts despite the hardware’s limitation in the setup. Hance, contributes to the cost-efficient due to its small in size, environmentally friendly, and hassle-free maintenance.
Volume: 16
Issue: 3
Page: 997-1003
Publish at: 2018-06-01

Comparison of Methods for Batik Classification Using Multi Texton Histogram

10.12928/telkomnika.v16i3.7376
Agus Eko; Universitas Muhammadiyah Malang Minarno , Ayu Septya; Universitas Muhammadiyah Maulani , Arrie; Universitas Islam Indonesia Kurniawardhani , Fitri; Universitas Mataram Bimantoro , Nanik; Institut Teknologi Sepuluh Nopember Suciati
Batik is a symbol reflecting Indonesian culture which has been acknowledged by UNESCO since 2009. Batik has various motifs or patterns. Because most regions in Indonesia have their own characteristic of batik motifs, people find difficulties to recognize the variety of Batik. This study attempts to develop a system that can help people to classify Batik motifs using Multi Texton Histogram (MTH) for feature extraction. Meanwhile, k-Nearest Neighbor (k-NN) and Support Vector Machine (SVM) algorithm were employed for classification. The performance of those classifications is then compared to seek the best classification method for Batik classification. The performance is tested 300 images divided into 50 classes. The results show the optimum accuracy achieved using k-NN with k=5 and MTH with 6 textons is 82%; however, SVM and MTH with 6 textons denote 76%. According to the result, MTH as feature extraction, k-NN or SVM as a classifier can be applied on Batik image classification.
Volume: 16
Issue: 3
Page: 1358-1366
Publish at: 2018-06-01

Initial Phase Effect on DOA Estimation in MMIMO Using Separated Steering Matrix

10.12928/telkomnika.v16i3.8539
Bayan Mahdi; Al-Nahrain University Sabar , Yasmine M.; Al-Nahrain University Tabra
Providing simple and low complexity algorithms for estimating the direction of arrival in large systems using Massive MIMO is considered an important issue. In this paper a method with reduced complexity was proposed to estimate the direction of arrival in FD- MMIMO. The Separated Steering Matrix (SSM) algorithm uses two separated equations for estimating elevation and azimuth angles of Multi-users. This method reduces the complexity of calculating the covariance matrix by decreasing the size of this matrix. This technique is tested using 2D-MUSIC algorithm. Since the mobility of devices affects the accuracy of direction estimation, thus the effect of the initial phase of transmitted signal from mobile device is tested.
Volume: 16
Issue: 3
Page: 946-954
Publish at: 2018-06-01

An Empirical Study on Peer-to-Peer Sharing of Resources in Mobile Cloud Environment

10.11591/ijece.v8i3.pp1933-1938
R. K. Nadesh , M. Aramudhan
The increase usage of mobile users with internet and interoperability among the cloud services intensifies the role of distributed environemtnt in today’s real world application. Modern technologies are important for building rich, scalable and interoperable applications. To meet the requirements of client,the cloud service provider should offer adequate infrastructure especially under heavy multi-client load.To provide solution for large scale requirements and to statisfy the mobile client from the critical situation like lacking with bandwidth,connectivity issues,service completion ratio, we present adhoc virtual cloud model  for different scenarios that include single and multiple client configurations with various file sizes of various file formats for retrieving files in the mobile cloud environement.We evaluate the strategies with the socket and RMI implemented using java and identify the best model for real world applications. Performance evaluation is done with the results obtained and recommends that when sockets and RMI can be appropriately used in peer-to-peer environment when the mobile user cannot connect directly to the cloud services.
Volume: 8
Issue: 3
Page: 1933-1938
Publish at: 2018-06-01
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