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27,404 Article Results

Least Mean Error Algorithm for Determining the Radome Dimension of Planar Antenna

10.12928/telkomnika.v14i4.4019
Adya; Atma Jaya University Pramudita , Yuyu; Lembaga Ilmu Pengetahuan Indonesia Wahyu
Antennas are generally contructed from metallic materials; therefore it is prone to corrosion when installed outdoors. Radome is an important part of an outdoor antenna that serves to protect the antenna from environmental conditions. Radome structure is not expected to have a significant influence on the characteristics of the antenna. Parametric study is generaly applied in finding the optimum antenna dimenssion included radome. A method for guiding a parametric study proses in finding the optimum antenna dimensions has investigated and proposed in this paper. In this study, a method for determining the optimum radome dimension for planar antenna by applying the algorithm Least Mean Error (LME) has investigated. LME algorithm is used to find the optimum dimensions of the radome. The simulation results show that the proposed method can be applied to determine the dimensions of a planar antenna.
Volume: 14
Issue: 4
Page: 1356-1361
Publish at: 2016-12-01

Designing Multi-Dimensional User Interaction for a Virtual Museum System

10.11591/ijeecs.v4.i3.pp649-654
Tengku Siti Meriam Tengku Wook , Noraidah Sahari @ Ashaari , Normala Rahim
The focus of this study is to improve the display platform for the State of Terengganu Virtual Museum System (muziummaya.terengganu.gov.my). The existing virtual museum can be displayed via desktop computing system where information is displayed on-line using features for searching, browsing, and manipulating artifacts and galleries. However, presentation of information on mobile device screens cannot be viewed effectively and is difficult to navigate due to the user's cognitive load. Therefore, this study will establish effective interaction design, taking into account the multi-dimensional context for the design of a user interface via a mobile device in the hopes that users who are students, curators, researchers, and the public can access the virtual museum system via desktop as well as from their mobile devices. This study was conducted in three stages i.e. user requirements analysis, interface design, and usability evaluation. The results of this research is the design of a multi-dimensional user interaction context that meets the display requirements and navigation information for mobile devices.
Volume: 4
Issue: 3
Page: 649-654
Publish at: 2016-12-01

Rectangular Patch Antenna Array for Radar Application

10.12928/telkomnika.v14i4.4742
Yudi; Research Center for Electronics and Telecommunications - Indonesian Institutes of Sciences (LIPI) Yuliyus Maulana , Yuyu; Research Center for Electronics and Telecommunications - Indonesian Institutes of Sciences (LIPI) Wahyu , Folin; Research Center for Electronics and Telecommunications - Indonesian Institutes of Sciences (LIPI) Oktafiani , Yussi; Research Center for Electronics and Telecommunications - Indonesian Institutes of Sciences (LIPI) Perdana Saputra , Arie; Research Center for Electronics and Telecommunications - Indonesian Institutes of Sciences (LIPI) Setiawan
This paper deals with the characterization of Rectangular Patch Antenna Arrays numerically and experimentally. This antenna is designed to work around frequency of 9.4GHz for radar applications. In the design process, the Computer Simulation Technology (CST) simulator software is utilized to determine the value of the antenna parameters such as gain, radiation pattern, and voltage standing wave ratio (VSWR). The Rectangular Patch Antenna Arrays realized by using the 1x16 patch antenna array, while the patch antenna is implemented using microstrip lines. The Duroid/RT5880 substrate with a dielectric constant of 2.2 and a thickness of 1.57mm applied for implementation. The characterization results show that the VSWR of realized antenna is 1.052, and the gain is 15,26dB which is 1.4dB lower than the design result, while the radiation pattern is unidirectional and elliptical polarization.
Volume: 14
Issue: 4
Page: 1345-1350
Publish at: 2016-12-01

Simulation and Performance Evaluation of Shunt Hybrid Power Filter for Power Quality Improvement Using PQ Theory

10.11591/ijece.v6i6.pp2603-2609
R. Balasubramanian , S. Palani
This work proposes the design of shunt hybrid filter using instantaneous power theory to improve the power quality and simulation has been carried out for 3 phase distribution system feeding different types of non linear loads. The proposed filter consists of parallel combination of 5th and 7th tuned selective harmonic elimination passive filters, which is connected in series with a small rating IGBTs based voltage source inverter. In this work, principle of compensation and filtering behavior of the system has been discussed in detail. Instantaneous real and reactive power theory based controller has been designed to estimate the reference current from the distorted current. In order to reduce the harmonics, generated reference currents are tracked by voltage source inverter using hysteresis band current controller. The performance of the hybrid scheme is evaluated for various nonlinear loads using Matlab/ Simulink tool. The detailed analysis has been carried out on harmonics reduction and DC bus voltage regulation and the simulation result ensures the feasibility of suggested control strategy. The proposed topology improves the filtering performance of the passive filter in hybrid scheme.
Volume: 6
Issue: 6
Page: 2603-2609
Publish at: 2016-12-01

A Methodology for Characterizing Real-Time Multimedia Quality of Service in Limited Bandwidth Network

10.12928/telkomnika.v14i4.3295
Yoanes; Institut Teknologi Bandung Bandung , Idi; Institut Teknologi Bandung Sumardi
This paper presents how to characterize the quality of multimedia which consists of audio and video that are transmitted in real-time communication through the Internet with limited bandwidth. We developed a methodology of characterizing the multimedia Quality-of-Service (QoS) by measuring network parameters (i.e., bandwidth capacity, packet loss rate (PLR), and end-to-end delay) of testbed network and simulating the audio-video delivery according to the measured network parameters. The analysis of network parameters was aimed to describe the network characteristics. Multimedia QoS was characterized by conducting a simulation using data which was collected from the previous network characterization. A simulation network model was built using OMNet++ representing a delivery of audio-video in real-time while a background traffic was generated to represent a real condition of the network. Apllying the methodology in a network testbed in Indonesia’s rural area, the simulation results showed that audio-video could be delivered with accepted level of user satisfaction.
Volume: 14
Issue: 4
Page: 1534-1544
Publish at: 2016-12-01

Streamflow Prediction by Applying Generalized Regression Network with Time Series Decomposition Method

10.11591/ijeecs.v4.i3.pp611-616
Muhammad Tayyab , Jianzhong Zhou , Rana Adnan , Changqing Meng , Aqeela Zahra
Precise and correct estimation of streamflow is important for the operative progression in water resources systems. The artificial intelligence approaches; such as artificial neural networks (ANN) have been applied for efficiently tackling the hydrological matters like streamflow forecasting in this study at upper Yangtze River. The objective is to investigate the certainty of monthly streamflow by applying artificial neural networks including Generalized Regression Network (GRNN). To overcome the non-linearity problem of streamflow, artificial neural networks integrated with discrete wavelet transform (DWT). Data has been analyzed by comparing the simulation outputs of the models with the correlation coefficient (R) root mean square errors (RMSE). It is found that the decomposition technique DWT has ability to improve the forecasting results as compare to single applied artificial neural networks. Moreover, all applied models are separately applies on the peak values as well which also have showed that intergrated model has more ability to catch the peak values
Volume: 4
Issue: 3
Page: 611-616
Publish at: 2016-12-01

Optically Switched Frequency for Reconfigurable Dipole Antenna Using Photodiode Switches

10.12928/telkomnika.v14i4.4164
Erna Risfaula; Institut Teknologi Sepuluh Nopember Kusumawati , Yono Hadi; Institut Teknologi Sepuluh Nopember Pramono , Agus; Institut Teknologi Sepuluh Nopember Rubiyanto
The design, fabrication, and measurement of reconfigurable antenna using photodiode switches has been investigated. The antenna had dimension 104 mm x 41 mm x 1.6 mm and FR4 substrate with relative permittivity4.8. It structure was Coplanar Stripline (CPS) dipole. Two photodiodeshad assembled on gap in both dipole arms, which was activated by 600 nm red laser. The unilluminated state, antennahad resonant frequency 800 MHz with RL -32 dB, 2225 MHz with RL -12.5 dB, 3320 with RL -14.1 dB. Meanwhile for the illuminated state, antennahad resonant frequency and return loss shifting to 800 MHz with RL -32 dB, 2225 MHz with RL -12.5 dB, 3320 MHz with RL -14.1 dB.This condition caused low impedance and longer dipole arm. If dimension size increases, resonant frequency will decrease. So, there was shifting frequency and return loss at under illuminated by laser.
Volume: 14
Issue: 4
Page: 1351-1355
Publish at: 2016-12-01

Novel DV-hop Method Based on Krill Swarm Algorithm Used for Wireless Sensor Network Localization

10.12928/telkomnika.v14i4.3985
Yang Sun , Shoulin Yin , Jie Liu
Wireless sensor network (WSN) is self-organizing network; it consists of a large number of sensor nodes with perception, calculation ability and communication ability. As we all know, the floor, walls or people moving has an effect on indoor localization, so it will result in multi-path phenomena and decrease signal strength, also the received signal strength indicator (RSSI) is unable to gain higher accuracy of positioning. When using multilateral measurement method to calculate the unknown node coordinates, it will generate big error in range-free distance vector-hop (DV-hop) localization algorithm of WSN. In order to improve the WSN positioning accuracy in indoor condition, more reasonable distribute network resources, in this paper, we firstly propose krill swarm algorithm used for WSN localization. First, we detailed analyze the multilateral measurement method in DV-hop localization algorithm. The position problem can be transformed into a global optimization problem. Then, we adequately utilize the advantage of calculating optimization problem. We apply the krill swarm algorithm into the stage of estimating unknown node coordinates in DV-hop algorithm to realize localization. Finally, the simulation experience results show that the localization with krill swarm algorithm has an obviously higher positioning precision and accuracy stability with different anchor node proportion and nodes. We also make comparison with DV-hop algorithm and the newest localization algorithm.
Volume: 14
Issue: 4
Page: 1438-1445
Publish at: 2016-12-01

Future Tech 5g Virtual Zero Latency

10.11591/ijict.v5i3.pp106-110
Nikitha Nikitha Nikitha
With the point of conveying any data in whenever and anyplace, the people to come (5G) remote communication systems turn into a style theme in the remote examination territories and new waveform, as one of the key empowering advances in 5G physical layer, pulls in developing exploration considerations lately. Be that as it may, the current method for waveform examination or investigation depends on the change of range productivity or use, while the majority of them neglects to research the vitality proficiency conduct, which is appeared to be the key execution metric of 5G frameworks. In this paper, the most part is concentrated on looking over the waveforms from the vitality proficiency perspective. Two classifications of waveforms, specifically channel based waveform and spreading-based waveform, are broke down and the related execution issues are talked about. Besides, we actualize the above waveforms utilizing programming characterized radio based model stage and produce the estimation results for the vitality productivity correlation.
Volume: 5
Issue: 3
Page: 106-110
Publish at: 2016-12-01

Exudate and Blood Vessel Feature Extraction in Diabetic Retinopathy Patients using Morphology Operation

10.12928/telkomnika.v14i4.3714
Siswo; Universitas Sultan Ageng Tirtayasa Wardoyo , Anggoro Suryo; Universitas Sultan Ageng Tirtayasa Pramudyo , Erika Diana; Universitas Sultan Ageng Tirtayasa Rizanti , Imamul; Universitas Sultan Ageng Tirtayasa Muttakin
Diabetic Retinopathy is one of the retina complications caused by diabetic disease with observable symptoms such as emergence of exudate and new blood vessels. The tool used to screen it is a fundus camera. However, analyzing the fundus image should be done by doctor who is an expert and will require a lot of time. Therefore, automatic feature detection can assist doctor in processing the retinal image in analyzing diabetic retinopathy disease. The proposed method has been tested on the morphological operations of the fundus image from Cicendo Eye Hospital, Bandung. The calculation results on feature extraction exudate area has a range of 0 pixels for normal retinal image, 17-21213 pixel for retinal image NPDR, and 125-12299 retinal image pixel for PDR. The calculation results on the extraction area of blood vessels has a range of 13319-46681 pixel to the normal retina, the retinal image 7435-49938 pixel for NPDR, and 13.81-53.802 retinal image pixel for PDR.
Volume: 14
Issue: 4
Page: 1493-1501
Publish at: 2016-12-01

Multi-Stage Partial Parallel Interference Cancellation Algorithm for MUSA Systems

10.12928/telkomnika.v14i4.4052
Yan; ChongQing University of Posts and Telecommunications Liang , Han; ChongQing University of Posts and Telecommunications Wu , Guangyu; ChongQing University of Posts and Telecommunications Wang
Multi-User Shared Access is a non-orthogonal multiple access scheme of 5G,which has a high computational complexity and a large time delay due to the usage of successive interference cancellation detection algorithm. This paper proposes a multi-stage partial parallel interference cancellation detection algorithm, which does not require repeated ordering and repeated matrix inversion. In the first stage of detection, the bits of these users with good channel conditions will be outputted, and the influence of multiple access interference on users with bad channel conditions in the second stage will be decreased. Theoretical analysis and simulation results show that the symbol error rate of the proposed algorithm is slightly better than that of the two-stage MMSE-PIC, and the complexity is reduced. In the meanwhile, the computational complexity is significantly reduced without SER performance degradation when compared with MMSE-SIC algorithm.
Volume: 14
Issue: 4
Page: 1390-1396
Publish at: 2016-12-01

Water Quality Monitoring with Fuzzy Logic Control based on Graphical Programming

10.12928/telkomnika.v14i4.3505
Mochammad Hannats Hanafi; Universitas Brawijaya Ichsan , Wijaya; Universitas Brawijaya Kurniawan , Miftahul; Universitas Brawijaya Huda
Water quality is the most important aspect to ensure success in various aspects of life, for example in the shrimp ponds. On a shrimp pond, water conditions are very vital because it has a very strict threshold. Unstable water conditions will affect growth and condition of shrimps, eat passion of shrimps, until their ability to survive greatly affect the survival of the shrimps. The percentage of farmers harvesting shrimps if the water did not have good conditions then the farmers will suffer significant losses if yields were not as expected, began from the amount of shrimp that was reduced due to death or the quality of the shrimp were judged from the size of the shrimp. So the authors wanted to do research on how to maintain the quality of the water in shrimp pond so that the water quality is maintained. To overcome this, we need to monitor water conditions based on the level of salinity and turbidity of water in order to stay in good condition. In this case, the researchers used fuzzy logic to monitor the amount of water quality and water volume. In this study only conducted water quality monitoring process but to do water changes to a certain condition still conducted manually. As well as the programming language used as the NI LabVIEW graphical programming with the application form to see monitoring of water quality so that water conditions are well preserved.
Volume: 14
Issue: 4
Page: 1446-1453
Publish at: 2016-12-01

Factors Influencing User’s Adoption of Conversational Recommender System Based on Product Functional Requirements

10.12928/telkomnika.v14i4.4234
Z.K. Abdurahman; Institut Teknologi Bandung Baizal , Dwi H; Institut Teknologi Bandung Widyantoro , Nur Ulfa; Institut Teknologi Bandung Maulidevi
Conversational recommender system (CRS) helps customers get products fitted their needs by repeated interaction mechanisms. When customers want to buy products having many and high tech features (e.g., cars, smartphones, notebook, etc.), most users are not familiar with product technical features. The more natural way to elicit customers’ needs is by asking what they really want to use with the product they want (we call as product functional requirements). In this paper, we analyze four factors, e.g., perceived usefulness, perceived ease of use, trust and perceived enjoyment  associated to user’s intention to adopt the interaction model (in CRS) based on product functional requirements. Result of experiment using technology acceptance model (TAM) indicates that, for users who aren’t familiar with technical features, perceives usefulness is a main factor influencing users’ adoption. Meanwhile, perceived enjoyment plays a role on user’s intention to adopt this interaction model, for users who are familiar with technical features of product.
Volume: 14
Issue: 4
Page: 1575-1585
Publish at: 2016-12-01

Real Time Weed Detection using a Boosted Cascade of Simple Features

10.11591/ijece.v6i6.pp2755-2765
Adil Tannouche , Khalid Sbai , Miloud Rahmoune , Rachid Agounoun , Abdelhai Rahmani , Abdelali Rahmani
Weed detection is a crucial issue in precision agriculture. In computer vision, variety of techniques are developed to detect, identify and locate weeds in different cultures. In this article, we present a real-time new weed detection method, through an embedded monocular vision. Our approach is based on the use of a cascade of discriminative classifiers formed by the Haar-like features. The quality of the results determines the validity of our approach, and opens the way to new horizons in weed detection.
Volume: 6
Issue: 6
Page: 2755-2765
Publish at: 2016-12-01

Paper-based Verification Design of Trade Business License in Indonesia

10.12928/telkomnika.v14i4.2915
Pizaini; Universitas Islam Negeri Sultan Syarif Kasim Riau Pizaini , Sugi; Institut Pertanian Bogor Guritman , Heru; Institut Pertanian Bogor Sukoco
The trade business license certificate (SIUP) is a paper-based license to conduct trade businesses in Indonesia issued by the government. Until today, there is no mechanism for verifying the validity of document unless to verify it manually. The current paper presents a design that allows paper-based verification of the printed trade business license. It aims to provide the verification mechanism and ensure the document validity. Our design implemented digital signature with QR Code image that placed into the document and the digital certificate issued by a certification authority (CA). The proposed scheme generated 442Bytes of data and version 14 of QR Code to scan easily by a reader device. The experimental result indicates that our scheme is easy and feasible to implement in Indonesia with guaranteed the document integrity, authentication, and nonrepudiation.
Volume: 14
Issue: 4
Page: 1527-1533
Publish at: 2016-12-01
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