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27,762 Article Results

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

An Examination of the Impact of Power Sector Reform on Manufacturing and Services Sector in Nigeria: an Empirical Analysis

10.11591/ijaas.v7.i2.pp117-126
Emmanuel Ameh Ojiya , Ngwu Jerome Chukwuemeka , B.A. Daneji , George Duhu Isiwu
The main objective of this study is to empirically examine the impact of Power Sector Reform on Manufacturing and Services Sector in Nigeria between 1999-2016. The study employed secondary annual time series data sourced from World Bank database (2016). The methodology adopted for the study was Augmented Dickey-Fuller (ADF); a test for long-run relationship using ARDL Bounds Testing approach  with analysis of long-run and short-run dynamics in the model. A striking revelation from the study is the inverse relationship that exists between manufacturing output and electricity consumption in Nigeria within the period referenced. This negative relationship is not unconnected with widespread allegation of misappropriation of budgeted funds for the Power Sector by successive administrations in Nigeria since 1999.  It must be stated in clear terms that constant and consistent electricity generation, transmission and distribution is sine-qua-none for the growth of the national economy. Virtually all sectors of the economy depend on the supply of electricity to do business and so the lack of this vital ingredient of growth contributes in no small measure in stagnating economic growth and development. Efforts at reforming the power sector can only be fruitful when ALL stakeholders in the power sector including the political class put away their personal agendas and take the bull by the horn towards rescuing the nation from the looming danger of stagnant economic growth. Furthermore, there is the need for the Nigerian government to come up with new, better and alternative ways of improving energy generation and supply, as well as proper maintenance of electricity infrastructure in the country.
Volume: 7
Issue: 2
Page: 117-126
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

A Novel Handoff Necessity Estimation Approach Based on Travelling Distance

10.11591/ijaas.v7.i2.pp105-116
Jyoti Madaan , Indu Kashyap
Mobility management is one of the most important challenges in Next Generation Wireless Networks (NGWNs) as it enables users to move across geographic boundaries of wireless networks. Nowadays, mobile communications have heterogeneous wireless networks offering variable coverage and Quality of Service (QoS). The availability of alternatives generates a problem of occurrence of unnecessary handoff that results in wastage of network resources. To avoid this, an efficient algorithm needs to be developed to minimize the unnecessary handoffs. Conventionally, whenever  Wireless Local Area Network (WLAN) connectivity is available, the mobile node switch from cellular network to wireless local area network  to gain maximum use of high bandwidth and low cost of wireless local area network as much as possible. But to maintain call quality and minimum number of call failure, a considerable proportion of these handovers should be determined. Our algorithm makes the handoff to wireless local area network only when the Predicted Received Signal Strength (PRSS) falls below a threshold value and travelling distance inside the wireless local area network is larger than a threshold distance.Through MATLAB simulation, we show that our algorithm is able to improve handover performance.
Volume: 7
Issue: 2
Page: 105-116
Publish at: 2018-06-01

Wireless Data Communication Techniques to Coordinate Distributed Rooftop PVs in Unbalanced Three-phase Feeder

10.12928/telkomnika.v16i3.7780
Rachmawati; Politeknik Negeri Lhokseumawe Rachmawati , Anita; Politeknik Negeri Lhokseumawe Fauziah , Nelly; Politeknik Negeri Lhokseumawe Safitri
A necessity of the availability of communication network to provide data transfer amongst the coordinated single-phase rooftop photovoltaic (PV) in unbalanced three-phase low voltage (LV) feeder is essential since fetching data within the sensor of each PV unit requires real-time measurement and reliable data exchange within smart grid (SG), loads and other PV units. The main objective of this paper is to model the popular Wi-Fi, WiMax and ZigBee wireless data communication techniques into algorithms using numerical analysis. Those communication technologies have low cost and low power consumption. The benefits and drawbacks of those considered wireless data communications are shown as the required data that transferred and appropriate coding is also proposed. The number of transmitted symbols and the processing time delay of the proposed data coding are numerically analyzed, the results indicated that the 100% penetration level of PV that resulted higher injected reactive power back into the networks is able to be overcome since the coordinated PVs along the feeder is communicating to lower the unbalanced voltage profile.
Volume: 16
Issue: 3
Page: 1101-1106
Publish at: 2018-06-01

Asymptotic features of Hessian Matrix in Receding Horizon Model Predictive Control with Medium Sized Prediction Frames

10.12928/telkomnika.v16i3.9035
M. Bilal; University of Technology Shahid , M. Abbas; University of Technology Abbasi , Sehar; University College of Engineering & Technology, The Islamia University of Bahawalpur Arsha
In this paper, Receding Horizon Model Predictive Control (RH-MPC) having a quadratic objective function is studied through the Singular Value Decomposition (SVD) and Singular Vectors of its Hessian Matrix. Contrary to the previous work, non-equal and medium sized control and prediction horizons are considered and it is shown that the Singular Values converge to the open loop magnitude response of the system and singular vectors contain the phase information. Earlier results focused on classical formulation of Generalized Predictive Control (GPC), whereas, current work proves the applicability to modern formulation. Although, method can easily be extended to MIMO systems, only SISO system examples are presented.
Volume: 16
Issue: 3
Page: 1174-1182
Publish at: 2018-06-01

Thermal Effect of Wind Generation on Conventional Generator in a Microgrid

10.11591/ijeecs.v10.i3.pp890-896
Azmi Hashim , Kwok L Lo
In order to reduce CO2 emissions, which is one of the key strategy in combatting global warming, development of wind energy technology as source of renewable energy has become more important globally. However, the variability of the wind speeds leads to the intermittent nature of wind power generation. The conventional generators in the system must be able to compensate this fluctuation to maintain system stability and meet the load demand in the grid. This in turn may increase the temperature of the conventional generators beyond what normally occurs without wind generation in the grid. The aim of the paper is to inestigate the effect of thermal heating of the generators due to the variable output of wind generation in different time of the year in a microgrid by proposing proper modelling in the simulation. The simulations are done in 24 hours period in four different time of the years corresponding to different seasons of the year.
Volume: 10
Issue: 3
Page: 890-896
Publish at: 2018-06-01

The Effects of “I Can Problem Solve Program” on Children’s Perspective Taking Abilities

10.11591/ijere.v7i2.11945
Ceren Yağmur Aras , Durmuş Aslan
This study was conducted to determine the effects of I Can Problem Solve Program on preschool children’s perspective taking skills. Participants were 51 children who were attending two public preschool. In the study, pretest – posttest – permanence test control group desing was used. There were an experimental group and two control groups in the study. As data collection tool, “Perspective Taking Test for Children (PTC)” which was developed by Aslan and Köksal-Akyol [1] were utilized. Firstly, PTC was applied to children as pretest. Then “I Can Problem Solve Program” which was developed by Shure [2] and adapted to Turkish by Öğülmüş [3] was applied to children in experimental group. Children in control groups were attend the regular program. After the completing the program application PTC was implemented to experimental group and control groups as posttest. Finally, PTC was applied to experimental group as permanence test after a month of posttest. At the end of the study, it was determined that I Can Problem Solve Program had a significant impact on children’s perspective taking skills. There was a statistically significant difference between experimental group and control groups in posttest, while there was no difference between the groups in prettest. Children in experimental group performed better than children in control groups in posttest. Moreover, there was no significant difference in experimental group’s scores between posttest and permanence test scores.
Volume: 7
Issue: 2
Page: 109–117
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

Face Recognition on Linear Motion-blurred Image

10.12928/telkomnika.v16i3.5480
Fergyanto E.; Bina Nusantara University Gunawan , Jeklin; Bina Nusantara University Harefa , Nobumasa; Toyohashi University of Technology Sekishita
Most face recognition algorithms are generally capable to achieve a high level of accuracy when the image is acquired under wellcontrolled conditions. The face should be still during the acquisition process; otherwise, the resulted image would be blur and hard for recognition. Enforcing persons to stand still during the process is impractical; extremely likely that recognition should be performed on a blurred image. It is important to understand the relation between the image blur and the recognition accuracy. The ORL Database was used in the study. All images were in PGM format of 92 × 112 pixels from forty different persons, ten images per person. Those images were randomly divided into training and testing datasets with 50-50 ratio. Singular value decomposition was used to extract the features. The images in the testing datasets were artificially blurred to represent a linear motion, and recognition was performed. The blurred images were also filtered using various methods. The accuracy levels of the recognition on the basis of the blurred faces and filtered faces were compared. The performed numerical study suggests that at its best, the image improvement processes are capable to improve the recognition accuracy level by less than five percent.
Volume: 16
Issue: 3
Page: 1249-1255
Publish at: 2018-06-01
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