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28,188 Article Results

A New Method of Reference Signals Calculation for Switching Compensator

10.12928/telkomnika.v14i1.2435
Yiying; China University of Mining & Technology Wang , Jiangong; China University of Mining & Technology Liu , Yang; China University of Mining & Technology Liu
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexThe switching compensation devices, such as active power filters and static var generator, are growing rapidly for power quality improvement. The current reference signals is one of the important factor affecting the responsible speed and compensation effect. In this paper, a new strategy for reference signals calculation is present based on Current’s Physical Components. Through the orthogonal decomposition of the load current by the CPC power theory, the reference current, for various compensation objectives of switching compensation devices, can be calculated by the combination of the orthogonal current components. It is demonstrated that this strategy can be used for various compensation goals of limited switching compensation devices and changing the compensation objectives on-line according to the power grids. The validity of the developed strategy is verified by the simulation results.
Volume: 14
Issue: 1
Page: 39-46
Publish at: 2016-03-01

Robust Localization Algorithm Based on Best Length Optimization for Wireless Sensor Networks

10.12928/telkomnika.v14i1.1731
Hua; Shandong Jiaotong University Wu , Guangyuan; Shandong Jiaotong University Zhang , Yang; Shandong Jiaotong University Liu , Yang; Shandong Jiaotong University Liu , Xiaoming; Shandong Jiaotong University Wu , Bo; Shandong Jiaotong University Zhang
In this paper, a robust range-free localization algorithm by realizing best hop length optimization is proposed for node localization problem in wireless sensor networks (WSNs). This algorithm is derived from classic DV-Hop method but the critical hop length between any relay nodes is accurately computed and refined in space WSNs with arbitrary network connectivity. In case of network parameters hop length between nodes can be derived without complicated computation and further optimized using Kalman filtering in which guarantees robustness even in complicated environment with random node communication range. Especially sensor fusion techniques used has well gained robustness, accuracy, scalability, and power efficiency even without accurate distance or angle measurement which is more suitable in nonlinear conditions and power limited WSNs environment. Simulation results indicate it gained high accuracy compared with DV-Hop and Centroid methods in random communication range conditions which proves it gives characteristic of high robustness. Also it needs relatively little computation time which possesses high efficiency. It can well solve localization problem with many unknown nosed in the network and results prove the theoretical analysis.
Volume: 14
Issue: 1
Page: 211-218
Publish at: 2016-03-01

Design of a New Telescope Control System for Use in Astronomical Transient Events

10.12928/telkomnika.v14i1.2676
Selcuk; Akdeniz University Helhel , Murat; TUBITAK National Observatory Dindar , Ekrem; TUBITAK National Observatory Kandemir , Saniye; TUBITAK National Observatory Dindar , Tuncay; TUBITAK National Observatory Ozisik
Robotic autonomous telescopes provide highlevel control by selecting astronomical targets for observation, and they usually run under the control of a scheduler. TalonVIEW is a newly designed robotic autonomous telescope control system (TCS) for 16 inches telescope mount for use in astronomical transient events. The telescope control algorithm was implemented in PXI chassis written in GProgramming (LabVIEW) on realtime operating system(PharLab) from scratch. A new TCP/IP library was also implemented in Talon software to communicate with Pharlab in PXI chassis. Initial setup without any permanent pier and polar alignment showed that the pointing error of the telescope has been obtained as 2.22 arcminutes (132 arcseconds) in RA axis (horizontal axis of the image) and 25 arcseconds in Dec axis (vertical axis of the image), and tracking error has been observed as 4.8 arcseconds per second.
Volume: 14
Issue: 1
Page: 156-161
Publish at: 2016-03-01

A comparative Study on Similarity Measurement in Noisy Voice Speaker Identification

10.11591/ijeecs.v1.i3.pp590-596
Inggih Permana
One of important part on speaker identification is the measurement of sound similarity. This study has compared two of the similarity measurement techniques in the noisy voice. First technique is done by using smallest vector sum of pairs and second technique is done by using frequency of occurrence of smallest vector pairs. Noise in the voice can reduce accuracy of speaker identification significantly. To overcome this problem, the two of similarity measurement was combined with Least Mean Square (LMS) for remove noise. Results of the experiments showed that the use of LMS can improve the accuracy of speaker identification at the two of similarity measurement techniques. Second technique produces better accuracy than first technique. Experimental result also showed improvement of LMS learning rate can improve the accuracy of speaker identification.
Volume: 1
Issue: 3
Page: 590-596
Publish at: 2016-03-01

A Contention-Based Routing Protocol for VANET

10.12928/telkomnika.v14i1.2743
Deling; Southwest Jiaotong University Huang , Yusong; Southwest Jiaotong University Yan
In VANETs, vehicles as nodes are self-organized and inter-communicated without centralized authority. The topology formed by vehicles changes quickly, which makes routing become instability. Position-based routing, compared with traditional routing, is more scalable and feasible. Thus it has been proven stabler for VANETs than conventional routing. However, the frequently changed topology and nodes density could break the path a packet is following. Thus designing a robust multi-hop routing in VANET is challenging. This paper proposes an enhanced position-based routing protocol called CBGR, which takes into account the velocity and direction of vehicles in VANET. Simulation results show that CBGR achieves a high level of routing performance in terms of hop counts, network latency and packet delivery ratio both in dense or sparse vehicular ad-hoc networks.
Volume: 14
Issue: 1
Page: 319-325
Publish at: 2016-03-01

Belief-Rule-Based Intelligent Decision System to Select Hospital Location

10.11591/ijeecs.v1.i3.pp607-618
Md. Mahbubul Islam , Tanjim Mahmud , Mohammad Shahadat Hossain
The general public’s demand of Bangladesh for safe health is rising promptly with the improvement of the living standard.  However, the allocation of limited and unbalanced medical resources is deteriorating the assurance of safe health of the people. Therefore, the new hospital construction with rational allocation of resources is imminent and significant. The site selection for hospital is one of the crucial policy-related decisions taken by planners and policy makers. The process of hospital site selection is inherently complicated because of this involves many factors to be measured and evaluated. These factors are expressed both in objective and subjective ways where as a hierarchical relationship exists among the factors. In addition, it is difficult to measure qualitative factors in a quantitative way, resulting incompleteness in data and hence, uncertainty. Besides it is essential to address the subject of uncertainty by using apt methodology; otherwise, the decision to choose a suitable site will become inapt. Therefore, this paper demonstrates the application of a novel method named belief rule-based inference methodology-RIMER base intelligent decision system(IDS), which is capable of addressing suitable site for hospital by taking account of large number of criteria, where there exist factors of  both subjective and objective nature. 
Volume: 1
Issue: 3
Page: 607-618
Publish at: 2016-03-01

Performance of Coded Modulation in Multicarrier CDMA System

10.11591/ijeecs.v1.i3.pp583-589
Linda Meylani , Nur Andini , Iswahyudi Hidayat
Coded modulation scheme introduce robust and reliable system. It combine coding and modulation in one system. This paper show performance of coded modulation with coding rate 2/3, using 8PSK and convolutional coding that implemented in MC CDMA system. MC CDMA is one of multicarrier system  that combine OFDM and CDMA so its offer reliable system in frequency selective fading. Decoding process for coded modulation is done by using log likelihood ratio for least significant bit (define the subset) and the entire bits (member of subset). Simulation result shown that coded modulation in MC CDMA system have a good performance in flat fading and frequency selective fading.  
Volume: 1
Issue: 3
Page: 583-589
Publish at: 2016-03-01

A Robust Range Accuracy Adaptation Criterion Based on Ziv-Zakai Lower Bound for Cognitive Positioning System

10.12928/telkomnika.v14i1.2345
Xinyue; Chongqing University of Posts and Telecommunications Fan , Zhili; Chongqing University of Posts and Telecommunications Li , Fei; Chongqing University of Posts and Telecommunications Zhou
Abstract Cognitive radio (CR) provides a theoretical foundation to achieve the cognitive function and collaborative function for the positioning nodes. Under this trend, the cognitive positioning system (CPS) has emerged. But the limitation of the traditional range accuracy adaptation criterion based on Cramér-Rao Lower Bound (CRLB) makes it very diffcult to put CPS into practices. To overcome this problem, it is necessary to further study the criterion in complex noise environment. Based on the time of arrival (TOA) location estimation algorithm, we analyze the performance of the range accuracy adaptation algorithm, which take the Ziv-Zakai lower bound information (ZZLB) as the CPS parameter optimization criterion. Simulation results show that the bound can provide more complete range accuracy adaptation information compared with CRLB. Furthermore, we can improve the positioning accuracy by means of enhancing the system signal-to-noise ratio (SNR), adjusting the system bandwidth and increasing the observation duration.
Volume: 14
Issue: 1
Page: 91-100
Publish at: 2016-03-01

High-Speed Computation using FPGA for Excellent Performance of Direct Torque Control of Induction Machines

10.12928/telkomnika.v14i1.3110
Tole; Universitas Ahmad Dahlan Sutikno , Nik Rumzi; Universiti Teknologi Malaysia Nik Idris , Auzani; Universiti Teknikal Malaysia Melaka Jidin
The major problems in hysteresis-based DTC are high torque ripple and variable switching frequency. In order to minimize the torque ripple, high sampling time and fast digital realization should be applied. The high sampling and fast digital realization time can be achieved by utilizing high-speed processor where the operation of the discrete hysteresis regulator is becoming similar to the operation of analog-based comparator. This can be achieved by utilizing field programmable gate array (FPGA) which can perform a sampling at a very high speed, compared to the fact that developing an ASIC chip is expensive and laborious.
Volume: 14
Issue: 1
Page: 1-3
Publish at: 2016-03-01

Co-simulation and Experiment Research on a Novel Erection Mechanism

10.12928/telkomnika.v14i1.2538
FENG Jiangtao , HUANG Xianxiang , GAO Qinhe , GUO Xiaosong , YAO Xiaoguang
The erection mechanism with movable back hinged bearing is a novel erection mechanism and the form of its moving process is complicated. The novel erection mechanism needs to be extensively tested to prove its value and to ensure it works properly. Kinetic analysis was accomplished and mathematical model of the hydraulic system was acquired. Fuzzy adaptive PID control was adopted for the erection mechanism taking advantage of fuzzy control and PID control. The novel erection mechanism was validated by virtual prototype technology realized by co-simulation method. The mechanical, hydraulic and control models were respectively established in ADAMS, AMESim and Simulink. Experiment was completed on a platform. The results of simulation and experiment indicate that the novel erection mechanism can move based on designed scheme and the control effect of fuzzy adaptive PID control is excellent. The novel erection mechanism has great practical value.
Volume: 14
Issue: 1
Page: 144-155
Publish at: 2016-03-01

Analysis of AC-AC Converter Based Dynamic Voltage Restorer for Maintaining Power Quality in the Transmission Line

10.11591/ijeecs.v1.i3.pp501-511
Tamilvanan G. , Mahendran S.
In the power system the major issue is to maintain the power quality .The term of power quality is to maintain the disturbance less voltage to the power system. The voltage disturbance mainly caused by voltage sag, voltage swell and harmonics presented in the system. If the system voltage is going below to the nominal voltage, then it is called as voltage sag. These power quality (PQ) events typically last for less than one second. If the system voltage is going above the nominal voltage, there it is called as voltage swell. The AC-AC converter based DVR is proposed. It can properly compensate for unlimited time duration, balanced, and as well as unbalanced voltage sag by observing the power from the grid. The pulse width modulation technique is used to triggering the switches. Only by the simple Bidirectional switches were used for generate the compensation voltage.
Volume: 1
Issue: 3
Page: 501-511
Publish at: 2016-03-01

Robust Image Segmentation Using LBP Embedded Region Merging

10.12928/telkomnika.v14i1.2713
Jie; Chinese Academy of Sciences Zhang , Chengjun; Chinese Academy of Sciences Xie , Liangtu; Chinese Academy of Sciences Song , Rui; Chinese Academy of Sciences Li , Hongbo; Chinese Academy of Sciences Chen
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity index. The region merging algorithm by the maximal similarity with color histogram has been applied successfully in color image segmentation. However, only using color histogram information is not sufficient and effective for superior segmentation. We propose a novel color image segmentation method based on region merging by using joint color-texture histogram in this paper. The proposed method incorporates both color histogram and texture histogram information to measure the similarity of different regions and thus to guide the region merging process. Experiments show that our method is more accurate and robust than traditional image segmentation methods based on region merging.
Volume: 14
Issue: 1
Page: 368-377
Publish at: 2016-03-01

Preventing Online Social Deception using Deception Matrix

10.11591/ijai.v5.i1.pp35-40
Alka Alka , Harjot Kaur
The organization collaboration is very important for the success of the organization. The persons who enter into the organization will interact with the other members of the organization. There exist leaders of the community who will be responsible for the management of the communication among the persons within the organization. Sometimes the information presented by the new person joining the community is not correct. That information will cause the deception over the network. In the purposed paper deception within the social media is going to be analyzed. Deception will cause legion of problems and sometimes death of the person who is deceived. The proposed paper suggests the mechanism for tackling such deceptions.
Volume: 5
Issue: 1
Page: 35-40
Publish at: 2016-03-01

Fluid Structure Interaction Numerical Simulation of Wiresweep in Electronics Packaging

10.12928/telkomnika.v14i1.2030
Dadan; Universitas Medan Area Ramdan , Usman; Universitas Medan Area Harahap , Andi; Universitas Medan Area Rubiantara , Chu Yee; Universiti Malaysia Perlis (UniMAP) Khor
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity index. This paper presents the computational of two-way fluid structure interaction technique by using Mesh based Parallel Code Coupling Interface for the visualization of wiresweep in the electronics packaging. Polymer rheology models with Castro-Macosko model have been used in the fluid flow model and Volume of Fluid technique was applied to melt front tracking of the fluid. The numerical analysis used User-Defined Function to allow curing kinetic model. Wiresweep profiles and pressure distribution within the mold are presented. The numerical results of melt front patterns and filled volume were compared with the previous experimental results and found in good agreement.
Volume: 14
Issue: 1
Page: 262-272
Publish at: 2016-03-01

Adaptive Traffic Controller Based On Pre-Timed System

10.12928/telkomnika.v14i1.2798
Freddy; Sekolah Tinggi Teknologi Adisutjipto Kurniawan , Haruno; Sekolah Tinggi Teknologi Adisutjipto Sajati , Okto; Sekolah Tinggi Teknologi Adisutjipto Dinaryanto
Adaptive traffic controller systems based on image processing have been developed widely. Nevertheless, in a developing country, the systems often could not be easily applied because all types of vehicle use the same road. Therefore, to overcome the problem, the new concept of the systems is proposed. The systems were developed from a pre-timed traffic controller system that based on AVR microcontroller. By default, the systems use the signal-timing plans to control the vehicle flow. To accommodate the traffic variations, a new method of vehicle detection has been built. The method calculated an intensity histogram standard deviation of the image representing a detection area to determine traffic density of each intersection lane. The systems modified the green-time of each lane based on the traffic density. The method could detect all types of vehicles and work properly in a day and a night time.
Volume: 14
Issue: 1
Page: 56-63
Publish at: 2016-03-01
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