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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 9,199 Documents
 83   84   85   86   87 
Performance simulation of broadband multimedia wireless networks simulation based on OPNET Sameer Abdul-Sattar Lafta; Aktham Hasan Ali; Marwah M. Kareem; Yasser A. Hussein; Adnan H. Ali
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.pp1-9

Abstract

As the rapid growth of multimedia application over the Internet, it is essential to preserve the Quality of Service (QoS), which is certifying the guaranteed service through the Internet and representing the biggest challenges for the current IP based services. Multimedia traffic usage has been increased in relation to the streaming media such as video conferencing using OPNET, the performance can be simulated based on heavy and light scenarios for video conferencing including web traffic. The overall WLAN load data are obtained for such scenarios, also the performance of simulated overall Delay in the three scenario networks is measured.
Design and Analysis of a Novel Two Phase Doubly Salient Permanent Magnet Machine Zhou Zhiqing; Chi Yongbin
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 1: January 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

A novel two-phase doubly salient permanent magnet machine (FMDSPM) with new winding configuration is proposed in this paper. This machine is identical to the existing doubly salient permanent magnet machine (DSPM) with respect to the mechanical structure, whereas the winding configuration is totally different from that in the latter. The structure and operation principle of FMDSPM is analyzed, and power and sizing equations are derived analytically, which provides the designer with initial calculation to determine the motor frame. Allowing for the new winding configuration utilized, the magnetic features of FMDSPM are investigated by using the FEA. The results show that this new machine is suitable to the application of DC square wave, and the output torque produced is smoother due to no cumbersomely commutating torque ripples compared with the existing DSPM. Further, the prototype is fabricated to validate the above analysis. DOI : http://dx.doi.org/10.11591/telkomnika.v12i1.3912Keywords:
Analysis and Design of High Performance Phase Frequency Detector, Charge Pump and Loop Filter Circuits for Phase Locked Loop in Wireless Applications P.N. Metange; K. B. Khanchandani
Indonesian Journal of Electrical Engineering and Computer Science Vol 4, No 2: November 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v4.i2.pp397-405

Abstract

This paper presents the analysis and design of high performance phase frequency detector, charge pump and loop filter circuits for phase locked loop in wireless applications. The proposed phase frequency detector (PFD) consumes only 8 µW and utilises small area. Also, at 1.8V voltage supply the maximum operation frequency of the conventional PFD is 500 MHz whereas proposed PFD is 5 GHz. Hence, highly suitable for low power, high speed and low jitter applications.  The differential charge pump uses switches using NMOS and the inverter delays for up and down signals do not generate any offset due to its fully symmetric operation. This configuration doubles the range of output voltage compliance compared to single ended charge pump. Differential stage is less sensitive to the leakage current since leakage current behaves as common mode offset with the dual output stages. All the circuits are implemented using cadence 0.18 μm CMOS Process.
Modeling and Simulation of Nine-Level Cascaded H-Bridge Multilevel Inverter A.A. Zulkefle; A.I.A. Rahman; M. Zainon; Z.A. Baharudin; Z. Zakaria; M.B. Farriz; S.A.A. Shukor; N.F. Johan; N. Saleh; M.A.M. Hanafiah
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 2: August 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v11.i2.pp696-703

Abstract

This paper analyzed a single phase nine level cascaded h-bridge multilevel inverter (CHMLI) topology in which requires lesser number of components and easier to control if compared to other methods. The inverter of different voltage levels (up to 9-Levels) are designed and simulated using MATLAB Simulink. A Level Shifted Multi-Carrier PWM control scheme is used to control the operation of the power switches for CHMLI topology. The results are compared in terms of THD.  The value of THD is found to be reduced as the number of voltage level of CHMLI is increased.
Evaluation of wind park tax incentives in Colombia by means of real options Miguel Jiménez-Gomez; Natalia Acevedo-Prins
Indonesian Journal of Electrical Engineering and Computer Science Vol 19, No 1: July 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v19.i1.pp459-465

Abstract

The objective of this study is to assess tax incentives in Colombia to foster investment in wind parks. Fiscal incentives seek to diversify energy consumption with non-conventional renewable energy sources, since power is mostly generated by hydraulic force and since its price is impacted during dry seasons. The price of energy is modeled according to a regression toward the mean. This stochastic process was chosen because during droughts in Colombia there are price increases, which then return to their average value. This is an upward and downward spike behavior, as well as a regression toward the mean. Given price uncertainty and its impact on cashflow, wind parks were valued with real options to flatten the reversal for five years. The real option of flattening as an American call option was considered. Results show that, according to traditional valuation methods, wind parks in Colombia are not profitable even with tax incentives. However, according to the real options method, tax incentives do make these projects economically viable.
The Improved Key Exchange Protocol Based on Public Key Certificates Cuijie Zhao; Guozhen Wang
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

We propose mutual authentication and session key exchange protocols based on certificates for the Internet of Things. We also propose an improved version for the conventional certificate-based systems. Our protocol is efficient, it requires fewer messages and only one session key. It gives use a new method to deal with such as preventing tampering and preventing interference security problems. In designing the security protocol proposed here, the low computational power of the wireless sensors nodes and the low bandwidth of the wireless networks are considered. It is good as low computational complexity and cannot be forged. DOI : http://dx.doi.org/10.11591/telkomnika.v12i4.4775
User behaviour pattern for online learning system: UiTM iLearn portal case Siti Fairuz Nurr Sadikan; Azizul Azhar Ramli; Mohd Farhan Md. Fudzee; Siti Sapura Jailani; Mohd Ali Mohd Isa; Prasanna Ramakrisnan; Roslani Embi
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 1: July 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v15.i1.pp382-390

Abstract

A Web server log files contain an entire record of the user’s browsing history such as referrer, date and time access, path, operating system (OS), browser and IP address. User navigation pattern discovery involves learning of user’s browsing behaviour to gain the pattern from web server log file. This paper emphasizes on identifying user navigation pattern from web server log file data of iLearn portal. The study implements the framework for user navigation including phases of acquisition of weblog, log query parser, preprocessor, navigational pattern modelling, clustering, and classification. This study is conducted in the context of the actual data logs of the iLearn portal of Universiti Teknologi MARA (UiTM). This study revealed the navigational patterns of online learners which relatively related to their intake or group along the semester of 14 weeks. Besides, access patterns for students along the semester are different and can be classified into three (3) quarter, namely Q1, Q2 and Q3 based on the total of week per semester. Future work will focus on the development of prototype to improve the security of online learning especially during the assessment progress such as online quiz, test and examination.
A Developed Graphical User Interface for Power System Stability and Robustness Studies Ghouraf Djamel Eddine; Naceri Abdellatif; Abid Mohamed; Kabi Wahiba
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 3: September 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v15.i3.pp458-467

Abstract

This paper present the realization and development of a graphical user interface (GUI) to studied the stability and robustness of power systems (analysis and synthesis), using Conventional Power System Stabilizers (CPSS - realized on PID scheme) or advanced controllers (based on adaptive and robust control), and applied on automatic excitation control of powerful synchronous generators, to improve dynamic performances and robustness. The GUI is a useful average to facilitate stability study of power system with the analysis and synthesis of regulators, and resolution of the compromise: results precision / calculation speed. The obtained Simulation results exploiting our developed GUI realized under MATLAB shown considerable improvements in static and dynamic performances, a great stability and enhancing the robustness of power system, with best precision and minimum operating time. This study was performed for different types of powerful synchronous generators.
Measured Data Processing Method For Relative Motions Between Two Side-by-side Ships Ping-an Shi; Jia-wei Ye
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 1: January 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

In order to design and implement a wave compensation system to reduce the relative motion between two side-by-side ships in waves, a new method to process measured data of ship model test with contact measurement to study the characteristics of relative motion was presented. The reference co-ordinate systems and relative motions were defined, and the scheme of the model test was described. Then the Empirical Mode Decomposition(EMD) adaptive filter were designed, the frequency domain integration transform method based upon Fast Fourier Transform(FFT) were established. The procedure to transform acceleration signal into displacement was proposed and verified, and the processing results with and without EMD adaptive filter were compared. Finally, the relative motions consistent with reality were acquired, which indicates this method is effective for measured data processing. DOI: http://dx.doi.org/10.11591/telkomnika.v11i1.1872
An Improvement on An Efficient Mobile Authentication Scheme for Wireless Networks Jian-Zhu Lu; Xiuwei Fan; Jipeng Zhou; Hao Yang
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 10: October 2013
Publisher : Institute of Advanced Engineering and Science

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

Abstract

Mobile communication network has brought us great convenience. However, network security issues are outstanding increasingly. Authentication is the most essential procedure for preventing illegitimate, unauthorized or insecure devices from making access to the network. Tang and Wu proposed an efficient mobile authentication scheme for wireless networks, and claimed the scheme can effectively defend all known attacks to mobile networks including the denial-of-service attack. This paper strengthens the security of the scheme by authenticating the identity of visited location register such that any adversary cannot obtain the communication key between a mobile user and a service provider, or prevent them from establishing this key. An improvement is proposed to remedy these flaws. Our design is a less strong requirement for a mobile user MS in the communication cost than that of Tang and Wu's. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3706 

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