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27,404 Article Results

Improved Energy Aware Cluster based Data Routing Scheme for WSN

10.12928/telkomnika.v14i2.3375
Khalid; Universiti Teknologi Malaysia Haseeb , Kamalrulnizam; Universiti Teknologi Malaysia Abu Bakar , Abdul; Universiti Teknologi Malaysia Hanan Abdullah , Tasneem; Universiti Teknologi Malaysia Darwish , Fasee; Universiti Teknologi Malaysia Ullah , Adnan; Quaid-e-Awam University of Engineering, Science and Technology Ahmed
Wireless sensor network (WSN) consists of several tiny devices that are dispersed randomly for gathering network field. Clustering mechanism divides the WSN into different sub-regions called clusters. Individual cluster is consisting of cluster head (CH) and member nodes. The main research challenges behind clustering mechanism are to optimize network overheads with efficient data delivery. Sensor nodes are operated by batteries and practically it is not feasible to replace them during sensing the environment so energy should be effectively utilized among sensors for improving overall network performance. This research paper presents an improved energy aware cluster based data routing (i-ECBR) scheme, by dividing the network regions into uniform sized square partitions and localized CH election mechanism. In addition, consistent end-to-end data routing is performed for improving data dissemination. Simulation results illustrate that our proposed scheme outperforms than existing work in terms of different performance metrics.
Volume: 14
Issue: 2
Page: 531-537
Publish at: 2016-06-01

Semi-supervised Online Multiple Kernel Learning Algorithm for Big Data

10.12928/telkomnika.v14i2.2751
Ning; Shangluo University Liu , Jianhua; Shangluo University Zhao
In order to improve the performance of machine learning in big data, online multiple kernel learning algorithms are proposed in this paper. First, a supervised online multiple kernel learning algorithm for big data (SOMK_bd) is proposed to reduce the computational workload during kernel modification. In SOMK_bd, the traditional kernel learning algorithm is improved and kernel integration is only carried out in the constructed kernel subset. Next, an unsupervised online multiple kernel learning algorithm for big data (UOMK_bd) is proposed. In UOMK_bd, the traditional kernel learning algorithm is improved to adapt to the online environment and data replacement strategy is used to modify the kernel function in unsupervised manner. Then, a semi-supervised online multiple kernel learning algorithm for big data (SSOMK_bd) is proposed. Based on incremental learning, SSOMK_bd makes full use of the abundant information of large scale incomplete labeled data, and uses SOMK_bd and UOMK_bd to update the current reading data. Finally, experiments are conducted on UCI data set and the results show that the proposed algorithms are effective.
Volume: 14
Issue: 2
Page: 638-646
Publish at: 2016-06-01

Backstepping Approach for Autonomous Mobile Robot Trajectory Tracking

10.11591/ijeecs.v2.i3.pp478-485
Ibari Benaoumeur , Benchikh Laredj , Hanifi Elhachimi Amar Reda , Ahmed-foitih Zoubir
This paper proposes a backstepping controller design for trajectory tracking of unicycle-type mobile robots. The main object of the control algorithms developed is to design a robust output tracking controller. The design of the controller is based on the lyapunov theorem, kinematic tracking controller of an unicycle-like mobile robot is used to provides the desired values of the linear and angular velocities for the given trajectory. A Lyapunov-based stability analysis is presented to guarantee the robot stability of the tracking errors. Simulation and experimental results show the effectiveness of the proposed robust controller in term of accuracy and stability under different load conditions.
Volume: 2
Issue: 3
Page: 478-485
Publish at: 2016-06-01

Exploration of Corpus Augmentation Approach for English-Hindi Bidirectional Statistical Machine Translation System

10.11591/ijece.v6i3.pp1059-1071
K. Jaya , Deepa Gupta
Even though lot of Statistical Machine Translation(SMT) research work is happening for English-Hindi language pair, there is no effort done to standardize the dataset. Each of the research work uses different dataset, different parameters and different number of sentences during various phases of translation resulting in varied translation output. So comparing  these models, understand the result of these models, to get insight into corpus behavior for these models, regenerating the result of these research work  becomes tedious. This necessitates the need for standardization of dataset and to identify the common parameter for the development of model.  The main contribution of this paper is to discuss an approach to standardize the dataset and to identify the best parameter which in combination gives best performance. It also investigates a novel corpus augmentation approach to improve the translation quality of English-Hindi bidirectional statistical machine translation system. This model works well for the scarce resource without incorporating the external parallel data corpus of the underlying language.  This experiment is carried out using Open Source phrase-based toolkit Moses. Indian Languages Corpora Initiative (ILCI) Hindi-English tourism corpus is used.  With limited dataset, considerable improvement is achieved using the corpus augmentation approach for the English-Hindi bidirectional SMT system.
Volume: 6
Issue: 3
Page: 1059-1071
Publish at: 2016-06-01

Critical Success Factor in Monetizing Blog

10.12928/telkomnika.v14i2.3041
Andika; Bina Nusantara University Rizky , Bens; Bina Nusanatara University Pardamean
Blog usage has transformed from its initial function as a digital diary into a legitimate form of mainstream media. Nowadays any member of the public can generate income from blogging through monetization even though various factors affect the results of this process. Four factors were identified: traffic, search engine optimization (SEO), post frequencies, and media usage. This study examines the level of importance of these factors through practical implementation into blogs then quantitatively determine which factor is critical for the success of blog monetization. An empirical analysis based on thirty samples of blogs were performed to assess the impact of the received income. The finding showed that the revenue for most of the blogs increased after the implementation of critical factors with SEO being the most critical of all the factors.
Volume: 14
Issue: 2
Page: 757-761
Publish at: 2016-06-01

WhatsApp, Viber and Telegram which is Best for Instant Messaging?

10.11591/ijece.v6i3.pp909-914
Tole Sutikno , Lina Handayani , Deris Stiawan , Munawar Agus Riyadi , Imam Much Ibnu Subroto
There are many free instant messengers available now which allow to communicate with friends with text, phone call, video, sharing of files, in group or not and keep contact with them even internationally. But only very few of the instant messengers have gained a popularity and attention. Recent studies have shown that the most popular instant messengers are WhatsApp, Viber and Telegram. Even, Facebook acquired WhatsApp due to have huge users. Viber is another messenger with many integrated features that allows the phone calls and sends the text messages for free and there is no subscription like WhatsApp. While Telegram offers the users an open-source platform with no ads, a clean fast interface, asks for no payments whatsoever and the biggest selling point is security. WhatsApp, Viber and Telegram which instant messenger is best? The popularity of Telegram has reached at the top of Google play store and become the most downloaded messaging app in the world today. But at the moment WhatsApp is still the winner!
Volume: 6
Issue: 3
Page: 909-914
Publish at: 2016-06-01

Harmonic Suppression Rectangular Patch Antenna with Circularly Polarized

10.12928/telkomnika.v14i2.2394
Nurzaimah; Universiti Teknikal Malaysia Melaka Zainol , Zahriladha; Universiti Teknikal Malaysia Melaka Zakaria , Maisarah; Universiti Teknikal Malaysia Melaka Abu , Mawarni; Universiti Teknikal Malaysia Melaka Mohamed Yunus
The rectangular patch antenna with proximity coupling at 2.45 GHz is designed and printed on FR-4 substrate with dielectric constant 4.3 and loss tangent 0.019. The overall size of proposed antenna gives 36 % reduction of substrate area as compared to conventional designs. The symmetrical arm of inverted U-stub and U-slot embedded on the transmission feed line suppress harmonic signal effectively at second and third order with minimum reflection coefficients of –0.51 dB and -2.28 dB respectively while circularly polarization was obtained by corner truncated and U-slot on the patch element. The return loss is -23.95 dB at fundamental modes with gain 4.61 dB and axial ratio of 1.48 dB.
Volume: 14
Issue: 2
Page: 471-477
Publish at: 2016-06-01

Measurement and Evaluation of Tx/ Rx Antennas for X-Band Radar System

10.12928/telkomnika.v14i2.3291
Folin; Research Center for Electronic and Telecommunication, Indonesian Institute of Sciences Oktafiani , Yuyu; Research Center for Electronic and Telecommunication, Indonesian Institute of Sciences Wahyu , Yusuf Nur; Research Center for Electronic and Telecommunication, Indonesian Institute of Sciences Wijayanto
This paper presents the performance evaluation of antennas for microwave transmission and reception in X-band radar systems. The transmitter (Tx) and receiver (Rx) antennas are fabricated on microstrip array structures. The antennas are connected to microwave circuits with transmission lines, coaxial cables, and microwave combiners and splitters. The designed antennas in X-band microwave operation for Tx and Rx parts were fabricated identically by 4x64 microstrip patch antennasin an array structure. The fabricated antennas were measured for return loss (S11), VSWR, radiation pattern, and Gain. The detail methods for the measurements are reported and their results are also discussed. The measured antenna gain of ~20dBi, and beam-width of ~20degreecan be obtained using the fabricated antennas at 9.4GHz microwave operation.
Volume: 14
Issue: 2
Page: 555-562
Publish at: 2016-06-01

Property Analysis of Composable Web services

10.12928/telkomnika.v14i2.2732
Wei; Shandong University of Science and Technology, Liu , Lu; Shandong University of Science and Technology, Wang , Yuyue; Shandong University of Science and Technology, Du , Pin; Shandong University of Science & Technology Wang , Chun; Tongji University Yan
Web services are basic components constructing a flexible business process software. By composing multiple Web services, a complicated business process across organization and departments can be formed. This paper present a formal model of composable Web services: composed service process nets (CSPNs). Properties of Composable Web services are analyzed based on CSPNs. The relation between a CSPN and its corresponding Web service process subnets are discussed. The property analysis methods of CSPNs are come up with. A dynamic property of CSPNs can be determined based on static net structures by means of the proposed methods.
Volume: 14
Issue: 2
Page: 734-740
Publish at: 2016-06-01

A Novel Multifunction Digital Chip Design Based on CMOS Technology

10.12928/telkomnika.v14i2.3675
Zi-Ang; Zhoukou Normal University Zhou , Wen-Bo; Zhoukou Normal University Geng
The realization of an analog-to-digital-conversion chip has great significance in the applications of electronic products. By considering mature time–number digitization, a new multifunction digital chip with a long time delay was designed in this study on the basis of the principle of analog-to-time conversion (ATC) and the realization of long time delay. With additional resistance, capacitance, and transistors, this chip can easily realize ATC, monostable triggers, Schmitt triggers, and multivibrators. The circuit composition of this chip was analyzed, and every module design was introduced. According to the simulation result of Hspice and CSMC 2P2M CMOS (Complementary Metal Oxide Semiconductor) process database, the chip layout (1mm2) design was accomplished by using CSMC 2P2M CMOS technology. Finally, the designed chip was applied in multiproject wafer flow. The flow test demonstrated that this new chip can meet design goal and is applicable to various digital integrated chip designs as an IP (intellectual property) core.
Volume: 14
Issue: 2
Page: 464-470
Publish at: 2016-06-01

Dithering Analysis in an Orthogonal Frequency Division Multiplexing-Radio over Fiber Link

10.11591/ijece.v6i3.pp1112-1121
Fakhriy Hario P , Adhi Susanto , I Wayan Mustika , Sevia M Idrus , Sholeh Hadi P
Nonlinearity is one major problem broadband communication faced on utilizing the high capacity of optical fibers. That is due to scattering  phenomenon, which results in the deviations of wavelengths and energies. The dithering method is applied in the attempt to reduce those scatterings. In this paper, we propose the performance of a dithering technique based new system OFDM-RoF using two modulator scheme and coherent detection to alleviate the characteristics nonlinearity applied on the system. The dithering technique inputs signal externally to the signal processing systems to eliminate the effects of nonlinearity. Here, we report the performance of a dithering technique based on the OFDM-RoF, the results our experiment showed that the applied dithering with 16 QAM modulation can make the system more reliable and increases  the power level 1.55% with 193.1 THz, 2% with  100 THz and 1.99% ~ 200 THz, the best condition are with fd < fc. However, all condition close proximity in the parameters OLP (optical launch power), BER and SER measurement. The result demonstrated a high efficiency and good power in which the OLP operated 6.396 dBm / 4.361 E-3 W~fd 200 THz, 3.578 dBm / 2.279 E-3 W~fd 193.1 THz and 6.420 dBm / 4.3384 E-3 W~100 THz. The best BER value is achieved at 0.33 and SER 0.78 at 5 km~fd 100 THz, 0.33 and 0.768 for 10 km~fd 193.1 THz, 0.478 and 0.92 for 50 km~fd 193.1 THz.
Volume: 6
Issue: 3
Page: 1112-1121
Publish at: 2016-06-01

Model Predictive Optimization Control Strategy for Three-level AFE Converter

10.12928/telkomnika.v14i2.2755
Xiaoyan; Anhui University of Science and Technology Shi , Longji; Anhui University of Science and Technology Zhu , Shuijuan; Anhui University of Science and Technology Yu
In view of the fact of traditional MPC prediction for three-level AFE converter with numerous switching vectors, time-cost computation and complex control, a simplified model predictive control algorithm is proposed in this paper. The multiple current prediction is transformed into a single virtual reference voltage vector prediction according to the inverse procedure of the model current prediction, and vector distribution method is adopted which can screens out the optimal vector. In the process of rolling optimization, multi-objective control is carried out by adding neutral point potential balance and reducing switching losses and other constraints to the cost function. Also the control delay of the algorithm is compensated. Finally, simulation experiments of three-level AFE converter under steady-state and dynamic conditions are provided. The results have verified correctness and practicability of the strategy.
Volume: 14
Issue: 2
Page: 440-448
Publish at: 2016-06-01

Implementing OLSR and Wireless VoIP as Low-Cost Infrastructure Telephony for Rural Area

10.12928/telkomnika.v14i2.3364
Istas; Sepuluh Nopember Institute of Technology Pratomo , Asriadi; Sepuluh Nopember Institute of Technology N , Achmad; Sepuluh Nopember Institute of Technology Affandi
Communication is one of essential elements in this life, including the people who live at rural areas. However, telecommunications in rural area especially in Indonesia have many constraints like expensive infrastructure, difficult terrain and electrical problem. This led to a lot of areas that uncovered by telecommunication access. In this paper, we proposed a design and architecture of mobile wireless communication based on modified openWRT as a solution for low-cost communication and telephony infrastructure in rural areas. The design combines VoIP over mesh ad-hoc network as a potential solution for cheap calls and use modified embedded device to save electrical resources as a node to connect each other with multi hop transmissions. With this approach, we get many advantages such as high mobility, easy to use, scalable, low-cost implementation, and low power consumption. This paper presents the measurement result of performance to provide access telecommunication in several conditions. In addition, this paper also shows benchmarking results and lifetime of the node that we use in this prototype. The results show that our node can provide telecommunications access in terms of making calls with good quality using wireless LAN. To sum this up, The OpenVoice node is expected to contribute bridging digital divide in rural areas.
Volume: 14
Issue: 2
Page: 563-573
Publish at: 2016-06-01

A Review on LSB Substitution and PVD Based Image Steganography Techniques

10.11591/ijeecs.v2.i3.pp712-719
Aditya Kumar Sahu , Gandharba Swain
There has been a tremendous growth in Information and Communication technologies during the last decade. Internet has become the dominant media for data communication. But the secrecy of the data is to be taken care. Steganography is a technique for achieving secrecy for the data communicated in Internet. This paper presents a review of the steganography techniques based on least significant bit (LSB) substitution and pixel value differencing (PVD). The various techniques proposed in the literature are discussed and possible comparison is done along with their respective merits. The comparison parameters considered are, (i) hiding capacity, (ii) distortion measure, (iii) security, and (iv) computational complexity.
Volume: 2
Issue: 3
Page: 712-719
Publish at: 2016-06-01

Analysis of Stemming Influence on Indonesian Tweet Classification

10.12928/telkomnika.v14i2.3113
Ahmad Fathan; Universitas Islam Indonesia Hidayatullah , Chanifah Indah; Universitas Islam Indonesia Ratnasari , Satrio; Universitas Islam Indonesia Wisnugroho
Stemming has been commonly used by some researchers in natural language processing area such as text mining, text classification, and information retrieval. In information retrieval, stemming may help to raise retrieval performance. However, there is an indication that stemming does not hand over significant influence toward the accuracy in text classification. Therefore, this paper analyzes further research about the influence of stemming on tweet classification in Bahasa Indonesia. This work examines about the accuracy result between two conditions by involving stemming and without involving stemming in pre-processing task for tweet classification. The contribution of this research is to find out a better pre-processing task in order to obtain good accuracy in text classification. According to the experiments, it is observed that all accuracy results in tweet classification tend to decrease. Stemming task does not raise the accuracy either using SVM or Naive Bayes algorithm. Therefore, this work summarized that stemming process does not affect significantly towards the accuracy performance.
Volume: 14
Issue: 2
Page: 665-673
Publish at: 2016-06-01
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