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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 35 Documents
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Search results for , issue "Vol 10, No 4: August 2012" : 35 Documents clear
Dynamic Response of High-Pressure Riser of Deepwater SBOP System Kanhua Su
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

The application of surface blowout preventer (SBOP) drilling system in deepwater environments has been demonstrated that it can save operation cost and time. The high pressure small diameter casing plays the role of the conventional riser and bears the complex loading caused by the wave and current force and drilling platform motion. The coupled quasi-static and uncoupled dynamic analysis models of deepwater SBOP drilling system were established. The analysis results indicate that the uncoupled method without consider the lateral offset on the end of the high pressure riser nearly no affection to the riser analysis. However, the uncoupled method has a certain impact on the mechanical analysis of the subsea wellhead and the casing string under mudline. The lateral offset of the high pressure riser changes greatly in the different times, the bending moment of the upper and lower stress joint of riser is bigger. The platform long-term drift has a greater impact on the dynamic response analysis of the high pressure riser of SBOP system for deepwater drilling. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.858
Securing E-mail Communication Using Hybrid Cryptosystem on Android-based Mobile Devices Teddy Mantoro; Andri Zakariya
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

One of the most popular internet services is electronic mail (e-mail). By using mobile devices with internet connection, e-mail can be widely used by anyone to exchange information anywhere and anytime whether public or confidential. Unfortunately, there are some security issues with email communication; e-mail is sent in over open networks and e-mail is stored on potentially insecure mail servers. Moreover, e-mail has no integrity protection so the body can be undectected altered in transit or on the e-mail server. E-mail also has no data origin authentication, so people cannot be sure that the emails they receive are from the e-mail address owner. In order to solve this problem, this study proposes a secure method of e-mail communication on Android-based mobile devices using a hybrid cryptosystem which combines symmetric encryption, asymmetric encryption and hash function. The experimental results show that the proposed method succeeded in meeting those aspects of information security including confidentiality, data integrity, authentication, and non-repudiation. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.874
Study of Construction Vehicles Automatic Transmission Wear Degree Based on Spectroscopic Technology Lidan Chen
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Flame atomic absorption spectrometry (FAAS) was adopted to detect the construction vehicles automatic transmission through simultaneous determination of typical metal elements contents (Copper, Chromium and Iron) in automatic transmission fluid (ATF). Standard curves of Copper, Chromium and Iron were portrayed. Six parallel tests were implemented and the relative standard deviations (RSD) were 2.59%, 2.89% and 2.71% for Copper, Chromium and Iron separately. Additionally, under the same test conditions and analysis methods, contents of Copper, Chromium and Iron in different mileages of construction vehicles automatic transmission were tested. Analysis showed that, with the increase of mileage, the wear degree of construction vehicles automatic transmission increased and the contents of Copper, Chromium and Iron in ATF were also increased follow specific functions for each element under certain driving condition, and the correlation coefficients R were 0.9994, 0.9993 and 0.9997 correspondingly. Finally, results illustrated that FAAS could serve as the rapid and non-destructive method to determine the contents of Copper, Chromium and Iron, and further to achieve the goal of examining the conditions of the major components of automatic transmission. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.853
A Wireless Sensor Network in Precision Agriculture Xijun Yan; Xiangwei Meng; Yan Yan
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Wireless sensor network has been applied in precision agriculture. This paper takes CC1000 RF as wireless transceiver, MCU MSP430F149 with high performance and Low-Power as the control center of sensor nodes, which can accurately monitor temperature, humidity and light intensity. Meanwhile, choose LM3S6918 which is a high-performance 32-bit ARM and to design sink node. Since the energy of sink node is unlimited, puts forward a new MAC protocol after experimental researches, and gives the specific methods of implementation and deployment. Experiments prove that the WSN has advantages of Lower-Power and stability. It can be competent for monitoring the general agricultural environment. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.869
Modeling and Simulation Research on Lightning Over-voltage of 500kV Hydroelectric Station Huang Wang-jun
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Lightning over-voltage amplitude of equipments on different branch nodes of the arterials has been obtained after the modeling and simulation analysis based on the EMTP (electromagnetic transients program) were done on the lightning over-voltage of a 500kV hydroelectric station was with the system’s worst working condition (single-line, single-transforming, and the line tower on the near side of 500kv hydroelectric station’s GIS was struck by lightning.) Thus, precise data have been acquired to select suitable equipments and verify the resisting lightning performance of the station. Finally, reasonable measures (such as reducing pulse resistance of line tower) are proposed to improve the comprehensive lightning resisting level of hydroelectric stations. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.848
Automatic Segmentation for Pulmonary Vessels in Plain Thoracic CT Scans Jun Lai; Mei Xie
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

As pulmonary CT has a lot of noise produced by thoracic imaging and partial volume effect, it is difficult that the computer segments out the correct blood vessels for plain thoracic CT. Therefore, after a deep investigation into the enhancement, segmentation methods and the upgrading ability of fractional differential operation, the paper proposes an automatic segmentation method for pulmonary vessel in the plain thoracic CT scans. The method steps are: pulmonary CT images have been enhanced with fractional differential operator firstly, and the image regions have been divided into sub-regions based on two control indexes, then a local optimal threshold is used for the vessels segmentation in each sub-region. The experiment results illustrate: the proposed method can segment out more complete low-level vessels, and the obtained vessel networks has more correct detail information. Compared with traditional methods, it has more accurate segmentation ability for pulmonary vessels in plain CT scans. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.864
Informatization Expectation with Cloud Computing in China YANG Zhexi; XUE Huacheng
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Cloud computing has been the most popular and promising concept in the new century with no doubt, which is the most important strategy filed to occupy for IT giants. It is said to lead the 3rd IT revolution, so it will affect every organization, enterprise and individual and therefore the process of informatization of China definitely. Literatures about informatization are reviewed in this paper, characters from market angle are concluded, and expectation is drawn to lead Cloud Computing informatization. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.879
Design of A Center Deviation Adaptive Bearing Pressure Assembly Machine Guangguo Zhang; Lei Zhang; Zhibin Chang
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

A car transmission in order to solve the production of eight gear and nine file two models of the transmission of tapered roller bearing outer ring manual assembly accuracy, low noise, the efficiency is low, the labor intensity and difficult to realize automatic assembly line requirements so assembly problem, put forward the center deviation adaptive bearing pressure assembly machine development. Through the research, design, test and making, eventually developed used in automobile gearbox bearing pressure assembly machine. Therefore  the automatic production is achieved,which improves the production efficiency, ensures the assembly quality, and brings higher profit to the enterprise. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.859
Image Encryption on Mobile Phone Using Super Encryption Algorithm Emy Setyaningsih; Catur Iswahyudi
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

This study aims to obtain the digital image encryption algorithm with a simple but secure process, fast and efficient computing resources. The algorithms developed in this study were super-encryption algorithm that combines two of cipher called Playfair cipher and the Vigenere cipher. To improve security, a keystream generator was used to randomize the order of the next key in Vigenere cipher. In order to evaluate performance, the proposed algorithm was measured through a series of tests. These tests were implemented with Matlab included visual test and histogram analysis, information entropy, encryption quality, correlation analysis, and also time analysis. The test results show that cipher  image looks visually random.The image histogram of the plain image and cipher image also seen a significant difference between the two of them. Testing was also performed on mobile phones with Symbian and BADA operating system based on Java Micro Edition Programming. Trial results show that the algorithm was require less computational resources; with average time for image encryption is 3.76 seconds, and the average time  for image decryption is 0.97 seconds. The new proposed image encryption scheme has satisfactory security which makes it a potential candidate for encryption of image data. Keywords:  Image encryption, Vigenere cipher, Playfair cipher, Security test DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.875
Fluctuations Mitigation of Variable Speed Wind Turbine through Optimized Centralized Controller Ali Mohammadi; Sajjad Farajianpour; Saeed Tavakoli; S. Masoud Barakati
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

A wind energy conversion system (WECS) including a variable wind turbine in grid-connected mode is considered to control. In this paper, each component of WECS model is systematically presented and then the integrated overall model is validated.Regarding to nonlinear nature of WECS and the complex system structure as multiple-input- multiple-output (MIMO),control procedure counters the problem which strategy to handle.To simplify the control policy, a centralized controller which is compatible with systematic modelling introduced, is employed. In other hand to augment the centralized controller performance, an optimization based on genetic algorithm (GA) is accomplished. Simulation results demonstate the proper efficiency in fluctuations mitigation. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.854

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