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INDONESIA
Indonesian Journal of Electrical Engineering and Computer Science
Published by Institute of Advanced Engineering and Science
ISSN : 25024752     EISSN : 25024760     DOI : -
Core Subject :
Arjuna Subject : -
Articles 9,174 Documents
 465   466   467   468   469 
Research on Hybrid Ray-tracing at 2.4 GHz in Man-Made Forests Yun-jie Xu; Wen-bin Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 7: July 2013
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The shadow of diffraction, which account for the growth of trees based on wireless sensors and automatic acquisition of environmental information, were presented to meet the requirements for a wireless sensor network in a forest.  there’s a necessity to avoid the dead zone of signal diffraction when laying wireless sensor in the forest, the integration of SBR and UTD is applied to study the impact of 2.4GHz radio-frequency signal on the path loss characteristics in the forest. Shadow fading is studied by considering random variations of trees height and position. Path loss to subscribers located in a forest are found using refraction and diffraction concepts. This paper achieved the ray location from the receive pint to field point by using back-ray tracing method and computed the response electric field relative to each ray by using UTD. This article presents an overview of popular prediction models and describes electric field algorithms that are based on the authors' experience, to improve their accuracy.  Take the poplar planted forest for instance. The measured value and simulated value were compared, finding good consistency between them, which indicates that SBR and UTD can effectively predict the path loss characteristics in the forest. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2833
Design and simulate a doherty power amplifier using GaAs technology for telecommunication applications Ehsan Barmala
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 2: August 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v15.i2.pp845-854

Abstract

In this paper, a Doherty power amplifier was designed and simulated at 2.4 GHz central frequency which has high efficiency. A Doherty power amplifier is a way to increase the efficiency in the power amplifiers. OMMIC ED02AH technology and PHEMT transistors, which is made of gallium arsenide, have been used in this simulation. The Doherty power amplifier unique feature is its simple structure which is consisting of two parallel power amplifiers and transmission lines. In order to integrate the circuit, the Doherty power transmission amplifier lines were implemented using an inductor and capacitive components. Also, the Wilkinson power divider is used on the chip input. To improve the efficiency, the auxiliary amplifier dimensions is selected enlarge and the further input power is allocated it by the power divider. A parallel R-C circuit has been used at the input of transistors to improve their stability. Simulation results show that the Doherty power amplifier has 17.2 dB output power gain, 23 dBm maximum output power, and its output power P1dB =22.6dBm at compression point -1 dB, also, its maximum efficiency is 55.5%.
Design of a New Intelligent Controller with Switch Management Guangfu Wang
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 11: November 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper has a study on a new intelligent Programmable Logic Controller based on industrial Ethernet (IPLCbIE). It proposes a complete solution for the target segment: MMM, WWW, F&B, Medium Hydro power. The scopes of the solution discussed in this paper are the process and field part of the IPLCbIE architecture. For the process part the scope of our design includes the controllers, the engineering software tools (Unity Pro) and the interfaces with the other equipment of this level, typically other controllers or tools like asset management, SCADA or OPC server. Safety and HSBY controllers are also part of our design. For the field part, the scope of our program includes the remote I/Os and the interfaces with the other equipment of this level, typically distributed I/Os & devices. In this paper, we make a study on the design of the controller. It includes the system architecture of IPLCbIE, the application of network module. And it focuses on the discussion of design for the kernel module of the PLC - network module NOC. Our design also includes the interfaces with the operation & management tools. The hardware design is especially introduced in detail in my paper. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3519  
Design, analysis and fabrication of utm hydraulic ram pump for water supply in remote areas S. Sarip; A. Q Mohd Radzi; T. S. Hong; R. Mohammad; M. F. Yakub; M. A. Suhot; H. M. Kaidi
Indonesian Journal of Electrical Engineering and Computer Science Vol 17, No 1: January 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v17.i1.pp213-221

Abstract

This paper focuses on design, analysis and fabrication of hydraulic ram pump, which uses the force of gravity to deliver water to higher altitudes. It does not depend on electrical and fossil energy and robust, inexpensive, easy to install and maintain. All these qualities make it suitable for use in remote areas where water and electricity supply, especially in developing countries. The aim of this study is to construct a low cost UTM hydraulic ram pump for water supply in remote areas, provided that it must have a reliable design and made of materials available locally in Malaysia. The design must also be easy to assemble and dismantle, easy to maintain and durable with a long service life. In order to achieve these objectives, existing ram pump designs by other researchers were studied to provide the basics in designing the UTM hydraulic ram pump. The ram pump efficiency is 62%, based on drive pipe diameter of 3” and air chamber volume of 33.3 L. Referring to the guidelines and experimental data these design specifications allow a total of 7000 L/day (4.86 L/min) of water to be delivered to the storage tank. The power required is about 23.9 kW which is enough to overcome head losses of about 54.52 m. Through a test stand, the value of circulations is 49 cycle/minute and thus the overall performance of the ram pump can be calculated before installation in remote areas. Other factors such as the proper material selection and safety considerations were also prioritized.
Characteristics Analysis and Detection Algorithm of Mosquitoes Jahangir Alam S.M.; Hu Guoqing; Cheng Chen
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i7.pp5368-5378

Abstract

The systematic detection and elimination of mosquitoes is a valuable process, the results of which could be important in the fight against Malaria. In this study, image processing is used, allowing the researchers to detect the mosquitoes and their locations. Mosquitoes' physical characteristics, territorial and behavioral patterns were also analyzed through recognition technology. It is found that mosquitoes can be detected and differentiated by their physical, territorial and behavioral patterns through these methodologies. In addition to mosquitoes, flies and bees are also included in this study and were analyzed for their patterns, as well as their distinguishing features. Size, number of objects, proboscis, body shape, color, antennae, hind legs, and shape parameters were all factors considered for mosquito detection with image processing. All these informations were used in the Mosquito Detection Algorithm. This study provides characteristic descriptions of all three insects and statistical analysis of the data found.
A Mixed Two-dimensional Linear Discriminate Method Shuang Xu; Min Li; Yanqiu Cui
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 6: June 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

Feature extraction is one of key technologies of the palmprint identification. In the light of the characteristics subspace palmprint identification technology, the two-dimensional principal component analysis, two-dimensional fisher linear discriminant and two-way two-dimensional principal component analysis algorithm is deeply analyzed. Based on two-dimensional subspace palmprint identification algorithm is a direct projection of the palmprint image matrix and is achieved very good results for dimension reduction. This paper proposed a mixed two-dimensional linear discriminant dimension reduction algorithm which can eliminate the relevance of rows and columns to get the best projection vector and extract optimal discriminant information. Experimental results show that the proposed method has faster extraction speed, higher recognition rate and better robustness. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2608
PTS Method with Combined Partitioning Schemes for Improved PAPR Reduction in OFDM System Zeyid T. Ibraheem; Md. Mijanur Rahman; S. N. Yaakob; Mohammad Shahrazel Razalli; F Salman; Kawakib K. Ahmed
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 11: November 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i11.pp7845-7853

Abstract

Although orthogonal frequency division multiplexing (OFDM) is an efficient wireless transmission system, it suffers from a crucial drawback namely high peak-to-average power ratio (PAPR) that limits transmitter power efficiency. Thus, different PAPR reduction algorithms have been introduced. Partial transmit sequence (PTS) is the most attractive solution which can provide good PAPR reduction performance without distortion. In any PTS system, partitioning of the OFDM frame into disjoint sub-blocks is a significant step. Out of the existing partitioning techniques, adjacent partitioning (AP) is a fairly simple partitioning scheme achieving efficient PAPR reduction performance. This paper presents an enhanced PTS approach that combines two PTS partitioning schemes, adjacent and interleaved partitioning, in order to effectively reduce the PAPR of OFDM systems. With an aim of determining the effects of length variability of adjacent partitions, we performed an investigation into the performances of a variable length adjacent partitioning (VL-AP) and fixed length adjacent partitioning in comparison with the enhanced PTS scheme.
Table Partitioning Technology Based on Massive Data Peng Wang; Ai-xue Tian; Chang Guo
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 3: March 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

In the Logistics Distribution System, in order to enhance the availability of massive data table, simplify the maintenance operations of data table, balance disk I/O and improve query performance, this system uses the range partitioning technology, interval partitioning technology, reference partitioning technology and list partitioning technology supported by Oracle 11g. Compared to retrieve the non-partitioned table and the partition table has been used time, execution plan and statistical information. Through analysis and comparison examples show that mass data table using partitioning technologies, can improve the SQL retrieval performance, and reduce execution costs. Therefore, the contribution of table partitioning technology on massive data tables is to improve the manageability and availability of data tables, and optimizing SQL retrieval performance. DOI : http://dx.doi.org/10.11591/telkomnika.v12i3.4455
Text analysis on health product reviews using r approach Nasibah Husna Mohd Kadir; Sharifah Aliman
Indonesian Journal of Electrical Engineering and Computer Science Vol 18, No 3: June 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v18.i3.pp1303-1310

Abstract

In the social media, product reviews contain of text, emoticon, numbers and symbols that hard to identify the text summarization. Text analytics is one of the key techniques in exploring the unstructured data. The purpose of this study is solving the unstructured data by sort and summarizes the review data through a Web-Based Text Analytics using R approach. According to the comparative table between studies in Natural Language Processing (NLP) features, it was observed that Web-Based Text Analytics using R approach can analyze the unstructured data by using the data processing package in R. It combines all the NLP features in the menu part of the text analytics process in steps and it is labeled to make it easier for users to view all the text summarization. This study uses health product review from Shaklee as the data set. The proposed approach shows the acceptable performance in terms of system features execution compared with the baseline model system.
The Design of Fine-grained Network QoS Controller and Performance Research with Network Calculus Hu Jia; Zhou Jinhe
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 6: June 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i6.pp4468-4474

Abstract

In this paper a network QoS controller is designed. We use the controller to quantification ally control QoS under the random network traffic. The controller is built by min-plus algebra based on network calculus. The controller includes two parts, the lossless fractal regulator and the finite variable storage shaper (FVSS). We can get the arrival curve with the lossless fractal regulator. Then the FVSS control network traffic to realize the fine-gained QoS controller. At last, we analyze the performance of the network QoS controller. Research results show that the relationship between packet losses, packet delays and the buffer storage. We clearly observe the change of the packet loss and the packet delay with the storage of buffer. The results can be applied to evaluate the congestion and flow control strategies, as well as these are references to design network control device parameters. DOI: http://dx.doi.org/10.11591/telkomnika.v12i6.5484

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