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23,598 Article Results

An Efficient Simulated Annealing Algorithm for Economic Load Dispatch Problems

10.12928/telkomnika.v11i1.880
Hardiansyah; University of Tanjungpura Hardiansyah , Junaidi; University of Tanjungpura Junaidi , Yohannes MS; University of Tanjungpura Yohannes MS
This paper presents an efficient simulated annealing (SA) algorithm with a single decision variable to solve the economic load dispatch (ELD) problems. The philosophy involves the introduction of a new decision variable through a prudent mathematical transformation of the relation between the decision variable and the optimal generations. The objectives of ELD problems in electric power generation is to programmed the devoted generating unit outputs so as to meet the mandatory load demand at lowest amount operating cost while satisfying all units and system equality and inequality constraints. Global optimization approaches is inspired by annealing process of thermodynamics. The proposed SA algorithm presented here is applied to two case studies, which analyze power systems having three, and six generating units. The results determined by the proposed approach are compared to those found by conventional quadratic programming (QP) and genetic algorithm (GA).
Volume: 11
Issue: 1
Page: 37-46
Publish at: 2013-03-01

Combination of Cluster Method for Segmentation of Web Visitors

10.12928/telkomnika.v11i1.906
Yuhefizar; Politeknik Negeri Padang Yuhefizar , Budi; Institut Teknologi Sepuluh Nopember (ITS) Santosa , I Ketut; Institut Teknologi Sepuluh Nopember (ITS) Eddy P , Yoyon K.; Institut Teknologi Sepuluh Nopember (ITS) Suprapto
Clustering is one of the important part in web usage miningfor the purpose of segmenting visitors. This action is very important for web personalization orweb modification. In this paper, we perform clustering of the web visitors using a combination of methods of hierarchical and non-hierarchical clustering toward web log data. Hierarchical clustering method used to determine the number of clusters, and non-hierarchical clustering method is used in forming clusters. The stages of cluster analysis are preceded by pre-processing the data and factor analysis. With this approach, the owner of the web is more effective at finding access patterns of web visitors and can have new knowledge about visitors’ segmentation. From the test applied on ITS’s web log data, 6 clusters of web visitors are resulted. Among the 6 cluster, cluster 3 has the biggest number of members. This information can be useful for web management to pay attention on members’ behavioral patterns of the 3rd cluster’s either to make personalization or modification on the web. The test results show the feasibility and efficiency of application of this method.
Volume: 11
Issue: 1
Page: 207-214
Publish at: 2013-03-01

A SaaS Development Platform based on Cloud Computing

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2136
Qingpeng ZENG , Shuixiu WU
Using Java technology to research and develop a SaaS development  and maintenance platform which is based on cloud computing ,it includes many modules such as the cloud computing load network, application server, development framework, cloud computing development engine , operation and maintenance system  and so on. the platform can provide a complete network client software development scheme for the development of software and integration, it can reduce the user’s request to SaaS technology, and it can help the user to achieve operation service of product on the Internet. at the same time, the platform as a development tool can be used as a powerful supplement of core electronic devices, high-end general chip and basic software products. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2320
Volume: 11
Issue: 3
Page: 1646-1651
Publish at: 2013-03-01

Cognitive FH Channel Selection for Bluetooth Network

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2133
Yi Peng , Qingzhi Du , Long Hua , Yubing Shao
Bluetooth is a short-range wireless technology that operates in the 2.4GHz unlicensed ISM band, so it will inevitably encounter the interference from other wireless systems and other Bluetooth piconets. Because of the flexible, efficient and reliable spectrum access by adapting the radio’s operating characteristics to the real-time conditions of the environment, cognitive radio technology is apply in Bluetooth network. In this paper, a novel cognitive FH channel selection method which is built based on link quality detection is proposed, interference temperature judgments model is analyzed and cognitive processing cycle of channel access is discussed. The simulation results indicated that cognitive FH Bluetooth network is more anti-interference than conventional Bluetooth systems. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2317
Volume: 11
Issue: 3
Page: 1626-1631
Publish at: 2013-03-01

Kinetic Parameters Identification of Double Pendulum Robot

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2071
Dan Yuanhong , Li Zushu
The model structure of Double Pendulum Robot (DPR) has been built up with Lagrange equations. To reduce the difference between simulation control and real-time control, the kinetic parameters of Double pendulum robot (DPR) is accurately identified with proposed improved genetic algorithm (IGA) which integrated hybrid coding, hamming distance, orthogonal experiment, feedback mutation, and a specially designed fitness function. This improved genetic algorithm (IGA) overcome the shortcoming of traditional genetic algorithm, strengthen global and local searching capability, and get results more close to global optimal solution.  Finally, the optimal results (kinetic parameter values) are applied to model, and make a contrast experiment of zero input response between searched optimal kinetic parameters and real kinetic parameters of DPR. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2174
Volume: 11
Issue: 3
Page: 1111-1118
Publish at: 2013-03-01

Fault Tolerant Air Bubble Sensor using Triple Modular Redundancy Method

10.12928/telkomnika.v11i1.884
Noor Cholis; Bandung Institute of Technology, Politeknik Negeri Bandung Basjaruddin , Yoga; Bandung Institute of Technology Priyana , Kuspriyanto; Bandung Institute of Technology Kuspriyanto
Detection of air bubbles in the blood is important for various medical treatments that use Extracorporeal Blood Circuits (ECBC), such as hemodialysis, hemofiltration and cardio-pulmonary bypass. Therefore a reliable air bubble detector is needed. This study presents the design of a new fault tolerant air bubble detector. Triple Modular Redundancy (TMR) method is used on the sensor section. A voter circuit of the Triple Modular Redundancy will choose one of three sensor outputs to be processed further. Application of Triple Modular Redundancy will prevent errors in the detection of air bubbles, especially if the sensor fails to work.
Volume: 11
Issue: 1
Page: 71-78
Publish at: 2013-03-01

Performance of Subcarrier and Power Allocation Orthogonal Frequency-Division Multiplexing on Millimeter Wave

10.12928/telkomnika.v11i1.901
Naemah; North Sumatra University Mubarakah , Rika Wahyuni; State Polytechnic of Medan Arsianti , Mulyadi; Borneo University Mulyadi
Local multipoint distribution system (LMDS) that operated in millimeter waves can be used to fulfill the need of bit rate higher than 40 Mbps. However it has problem when applied in tropic country such as Indonesia because of the high rainfall. Therefore LMDS system was developed by cross-layer mechanism.  In this research we used joint subcarrier and power allocation (JSPA) technique in multi-user cross-layer OFDM. This technique is proposed to increase the performance of telecommunication system even there were disturbance of rain attenuation. The research is discussing the performance of transmission capacity, data rate, utility and fairness of JSPA algorithm that applied in rain attenuation measurement in Surabaya. The result shows the increment of performance system using JSPA technique. For 40 dB rain attenuation, JSPA can achieves respectively average capacity of transmission up to 173,3%, 189,9 % for data rate and 9,6% for fairness system. The application of JSPA technique improve the performance of utility 13,61-15,48 bps/Hz
Volume: 11
Issue: 1
Page: 167-174
Publish at: 2013-03-01

B-MAC Design and Analysis for Embedded Sensor Networks

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2099
Liu Yumin , Sun Yonghe , XU Fengming , Wang Tao
This paper presents medium access control (MAC) protocol designed for embedded sensor networks. I start with a protocol called MACAW, RTS-CTS-DS-DATA data packet exchange. Then I analyze the properties of some MAC protocols, including S-MAC, B-MAC and IEEE 802.15.4. According to the understanding of S-MAC, some advantages are summarized, such as energy saving, latency reduction, etc. however, there are still some disadvantages, including data packet lost, unfairness, synchronization. And then the similarities and differences between them are discussed. S-MAC is a novel technique to reduce energy consumption, but B-MAC is more efficient with long preamble. Using long preamble, B-MAC achieves collision avoidance and high channel utilization rate. B-MAC can minimize idle listening, but it needs bi-directional communication. Finally, the paper presents B-MAC design process and implementation result on MSP430. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2211
Volume: 11
Issue: 3
Page: 1328-1337
Publish at: 2013-03-01

Lower Cross-Braced Truck and Swing Motion Truck Have Different Effect on Freight Car Dynamics Performance

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2092
Chao Chen , Yanhui Han , Mei Han
There are two major types of trucks for freight car in Chinese railroad. One is the lower cross-braced truck; the other is the swing motion truck. To evaluate the different performance, diamond resistant rigidity of the lower cross-braced truck and the lateral stiffness of the swing motion truck are analyzed. To simulate the dynamics performance of the swing motion truck, an equivalent lateral stiffness is calculated. Then it is modeled as a lateral spring between side frames and bolstered to simulate the swing. After that, two typical freight cars’ models which use the two types of trucks are built in SIMPACK. The L/V Ratio and Wheel Load Reduction Ratio are chosen for evaluating running safety of the freight car. The simulation results are compared and they prove that the impact force between wheel and rail when the car passing curve can be reduced effectively as the swing motion truck has a better lateral flexible. Therefore, it has a lower L/V ratio under the same running and loading condition. However, the swing leads a larger lateral displacement of the car-body, so the gravity center of loaded car has a larger lateral displacement than the car with lower cross-braced truck; which results to a larger Wheel Load Reduction Ratio. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2204
Volume: 11
Issue: 3
Page: 1278-1283
Publish at: 2013-03-01

A Review of Geometric Reconstruction Algorithm and Repairing Methodologies for Gas Turbine Components

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2131
Haidong Wu , Jian Gao , Si Li , Yaohui Zhang , Detao Zheng
Repairing of the used gas turbine components is becoming a challenge due to continual increase in manufacturing costs and the complex geometry. This paper discusses research on the repairing solutions for the damaged ones. The various kinds of geometric reconstruction algorithm for those are introduced selectively from the cross-section of the blade because of its vital roles. However, owing to the limitation of the algorithm, it has been lack of an efficient approach for reconstructing the geometry of a blade. As a result of this study, future research directions are highlighted. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2311
Volume: 11
Issue: 3
Page: 1609-1618
Publish at: 2013-03-01

Migration from Gasoline to Gaseous Fuel for Small-scale Electricity Generation Systems

10.12928/telkomnika.v11i1.879
Seno D.; Tanjungpura University Panjaitan , Yandri; Tanjungpura University Yandri , Sukandar; Bandung Institute of Technology Sukandar , Berlian; Tanjungpura University Sitorus
This paper describes a study that gives a consideration to change fuel source for electriccity generator from gasoline to combustible gas. A gaseous fuel conversion technology is presented and its performance is compared with gasoline. In the experiment, two types of load were tested, resistive and resistive-inductive. By using both fuels mostly the power factor (Cos φ) of resistive-inductive load variations were greater than 0.8, and they had slight difference on operational voltage. The drawback of using gaseous fuel is the frequency of the electricity might be not reach the standard frequency (i.e. 50 Hz). In the lab scale experiment, the gasoline consumption increased proportionally with the load increase, while using gaseous fuel the consumption of gas equal also increased where the average consumption value is 100 gram per 15 minutes operation for the tested load in the experiment. The main advantage using gaseous fuel (liquefied petroleum gas or biogas) compared to gasoline is a cleaner emitted gas after combustion.
Volume: 11
Issue: 1
Page: 29-36
Publish at: 2013-03-01

Segmentation for Image Indexing and Retrieval on Discrete Cosines Domain

10.12928/telkomnika.v11i1.896
Suhendro Y; Darmajaya Informatics and Business Institute Irianto
This paper used region growing segmentation technique to segment the Discrete Cosines (DC) image. The classic problem of content Based image retrieval (CBIR) is the lack of accuracy in matching between image query and image in the database. By using region growing technique on DC image,it reduced the number of image regions indexed. The proposed of recursive region growing is not new technique but its application on DC images to build  indexing keys is quite new and not yet presented by many  authors. The experimental results show that the proposed methods on segmented images present good precision which are higher than 0.60 on all classes. So, it could be concluded that region growing segmented based CBIR more efficient   compared to DC images in term of their precision 0.59 and 0.75, respectively. Moreover, DC based CBIR can save time and simplify algorithm compared to DCT images. The most significant finding from this work is instead of using 64 DCT coefficients this research only used 1/64 coefficients which is DC coefficient.  
Volume: 11
Issue: 1
Page: 119-126
Publish at: 2013-03-01

A Novel Calibrator for Electronic Transformers Based on IEC 61850

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2138
Baoxiang PAN
It is necessary for electronic transformer to make calibration before putting it into practice. To solve the problems in actual calibration process, a novel electronic transformer calibrator is designed. In principle, this system adopts both the direct method and the difference method, which are two popular methods for electronic transformer calibration, by this way the application of the system is extended with its reliability improved. In the system design, based on virtual instrument technology, LabVIEW and WinPCap toolkit are used to develop the application software, and it is able to calibrate those electronic transformers following the standard of IEC 61850. In the calculation of ratio and phase error based on fast Fourier transform, a new window function is introduced, and thus the accuracy of calibration, influenced by the frequency vibration, is improved. This research provides theoretic support and practical reference to the development of intelligent calibrator for electronic transformers. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2322
Volume: 11
Issue: 3
Page: 1665-1673
Publish at: 2013-03-01

ECG Signal Feature Selection for Emotion Recognition

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2103
Lichen Xun , Gang Zheng
This paper aims to study the selection of features based on ECG in emotion recognition. In the process of features selection, we start from existing feature selection algorithm, and pay special attention to some of the intuitive value on ECG waveform as well. Through the use of ANOVA and heuristic search, we picked out the different features to distinguish joy and pleasure these two emotions, then we combine this with pathological analysis of ECG signals by the view of the medical experts to discuss the logic corresponding relation between ECG waveform and emotion distinguish. Through experiment, using the method in this paper we only picked out five features and reached 92% of accuracy rate in the recognition of joy and pleasure. DOI: http://dx.doi.org/10.11591/telkomnika.v11i3.2215
Volume: 11
Issue: 3
Page: 1363-1370
Publish at: 2013-03-01

An Age Estimation Method to Panoramic Radiographs from Indonesian Individuals

10.12928/telkomnika.v11i1.905
Anny; Institut Teknologi Sepuluh Nopember Yuniarti , Agus Zainal; Institut Teknologi Sepuluh Nopember Arifin , Arya Yudhi; Institut Teknologi Sepuluh Nopember Wijaya , Wijayanti Nurul; Institut Teknologi Sepuluh Nopember Khotimah
 Dental features can be considered as the best candidate feature for post-mortem identification. If ante-mortem data is unavailable, then forensic experts are needed for reducing the search space by creating post-mortem dental profiling. Age is one of important factors in dental profiling. Manual inspection of dental radiographs suffers from two drawbaks, i.e., intraobserver error and interobserver error. This paper proposed a semi-automatic system for age estimation. There are two phases in developing the proposed system, i.e., the modeling phase and the estimation phase. The modeling phase is the stage for deriving an estimation formula based on known data. In this paper, we use data taken from Javanese people. The estimation phase include the process of defining a Region of Interest (ROI), automatic length computation, and age estimation based on the derived modeling formula. Our experiments showed a promising result, i.e., an average absolute error of 5.2 years, compared to application of the Kvaal method to panoramic radiographs from Turkish individuals that yields a difference of more than 12 years.
Volume: 11
Issue: 1
Page: 199-206
Publish at: 2013-03-01
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