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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 9,226 Documents
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Design and Simulation for UHF oscillator using SAWR with different schematics M M Elsherbini; M F Elkordy; A M Gomaa
Indonesian Journal of Electrical Engineering and Computer Science Vol 1, No 2: February 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v1.i2.pp294-299

Abstract

Various schematics for colpitts oscillator with fixed ultra-high frequency using either LC tank circuits or one port surface acoustic wave resonator are presented. Four circuits used to achieve 433.9 MHz oscillating frequency, Two of them using NPN Bipolar junction transistor, while the others using operational amplifier with high speed, gain and accuracy. A comparison between using passive elements as a source of resonance frequency and using SAW resonator is introduced. Another comparison between using an equivalent lumped circuit instead of SAWR package in oscillator design is also introduced. Two different software tools are used to achieve the required simulation. Proteus and ADS tools are used in simulation with AC, S-parameters and hybrid simulation. This paper is considered a direct application for SAW resonators in wide bandwidth ASK Transmitter / Receiver.
An Optimized Iteration Algorithm based on C-V model and Graph Cuts Hong Lan; Lequan Min
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 8: August 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

C-V model can self-adapt to the changes of curve topology but requires more iterations and needs more computing time. Graph cuts algorithm is good at getting the global optimum in a short time but not suitable for concave object extraction.To overcome the flaws of these two algorithms, an optimized iteration algorithm has been proposed. First the initial contour is deformed with an improved C-V model, which was without re-initialization during iterative process and the iteration stop condition is set by calculating changing area within the contour. Then the active contour is input to graph cuts algorithm. Dilates the contour into its neighborhood and formed an inner and an outer boundary seperatively, changes these two boundaries as source and sink, and obtains the final contour by graph cuts. Experiments show that this optimized algorithm reduces the iteration time, and has better effect and higher efficiency for image segmentation. DOI: http://dx.doi.org/10.11591/telkomnika.v11i8.3035 
Study on Breakdown Voltage for Vegetable Oils With Additive TiO2 Muhammad Bin Yahya; Raja Muhammad Khidir Raja Chik
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 1: October 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i1.pp175-181

Abstract

High voltage power transformers commonly used petroleum-based mineral oil for cooling and insulation purposes. Researchers are looking for suitable vegetable oils as alternatives to mineral oil to be used as transformer oil. The alternative vegetable oils are biodegradable, non-toxic and environmentally friendly. They may require some processing and modification to improve some of their properties to ascertain their safe use in power and distribution transformers as well as in high voltage equipment. This paper presents a study on the AC breakdown voltages of Palm Oil (PO) and Coconut Oil (CO) with presence of an additive. PO and CO are chosen as they are locally produced oils in Malaysia and easily obtained. The type of additive used in this study is Titanium dioxide TiO2. TiO2 nanoparticles was added into PO and CO at volume concentration of 0.1% to 0.5%. The effect of different gap distance of electrode 1.5mm, 2.5mm and 3.5mm was studied. The temperature of oil is controlled at 30oC. This paper provides a comparative assessment of breakdown properties through experimental investigation of PO and CO before and after the additive is added according to ASTM D1816 standard. From the experimental result, the PO have slightly higher breakdown voltage compared to CO. From all oil sample data recorded, it can be concluded that the breakdown voltage had increased to the increase in gap distance of electrode under presence of TiO2.
Bandwidth Enhancement of Metamaterial Loaded Microstrip Antenna using Double Layered Substrate V. Srinivasa Rao; K.V.V.S. Reddy; A.M. Prasad
Indonesian Journal of Electrical Engineering and Computer Science Vol 5, No 3: March 2017
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v5.i3.pp661-665

Abstract

Communication has become a key aspect of our daily life, becoming increasingly portable and mobile. This would need the use of micro strip antennas. The rapid growth has led to the need of antennas with smaller size, increased bandwidth and high gain. In this paper, a new version of micro strip patch antenna is designed by adopting double layered substrate concept and adding a layer of metamaterial structure to a square micro strip antenna. The antenna properties gain, return loss and bandwidth are studied to achieve better performance. The designed patch antenna has an improved bandwidth of 60% at a resonant frequency of 2.47 GHz. This antenna is designed and simulated by using HFSS software.
Signal modulation techniques in Non-orthogonal waveform for future wireless communication system Siti Rosmaniza AR; Norulhusna Ahmad Ahmad; Sharifah Kamilah Syed Yusof
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 3: September 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v15.i3.pp1458-1465

Abstract

In the future generation of the wireless communication system, the utilization of bandwidth needs to be managed efficiently. Due to that, research on enhancing the efficiency of the bandwidth has recently attracted numerous interests focusing more on the non-orthogonal waveform generation and detection. Even though non-orthogonal waveform is promising a higher efficiency, it introduces inter-carrier interference (ICI) at the transmitter due to the subcarrier overlapping.  In this paper, the signaling technique for non-orthogonal waveform generation and detection is discussed. This paper also proposed the use of accumulator (ACC) to improve the system performance of the signal modulation in the non-orthogonal waveform for the next generation of the wireless communication system. The result is represented in an EXtrinsic Information Transfer (EXIT) chart to show the effects of adding ACC into the non-orthogonal system.
Optic Nerve Head Segmentation Using Hough Transform and Active Contours Handayani Tjandrasa; Ari Wijayanti; Nanik Suciati
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 3: July 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Optic nerve head is part of the retina where ganglion cell axons exit the eye to form the optic nerve. Glaucomatous changes related to loss of the nerve fibers decrease the neuroretinal rim and expand the area and volume of the cup. This study implements  the detection of the optic nerve head in retinal fundus images based on the Hough Transform and Active Contour Models. The process starts with the image enhancement using homomorphic filtering for illumination correction, then proceeds with the removal of blood vessels on the image  to facilitate the subsequent segmentation process. The result of the Hough Transform fitting circle becomes the initial level set for the active contour model. The experimental results show that the implemented segmentation algorithms are capable of segmenting optic nerve head with the average accuracy of 75.56%. DOI: http://dx.doi.org/10.11591/telkomnika.v10i3.614
A Future Home Power System with Contactless Power Transmission Technologies Lan Jian Yu; Tang Hou Jun
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 12: December 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

The traditional home power system is not suitable for the current complex household appliances for its low efficiency, which need a new power system. In this paper, a future home power system with contactless power transmission (CPT) technologies is proposed. Besides, with the consideration of using renewable power, a solar power hybrid generation system is integrated in the future power system. In addition, the distributed power system is introduced to the proposed power system instead of traditional centralized power method. The distributed power system is more stable and efficient. On the other hand, thanks to the CPT technologies, household appliances will be more safe and friendly by using CPT systems than before by eliminating cords and plugs. A simulation by PSIM DEMO version of the proposed future power system shows that the proposed concept is feasible. Furthermore, a CPT prototype has been fabricated to analyze the circuit characteristics of the CPT system.A novel concept of home power system is proposed, elaborated in detail and simulated by computer software. DOI: http://dx.doi.org/10.11591/telkomnika.v11i12.3692
Advances on CMOS Shift Registers for Digital Data Storage Mohammad Arif Sobhan Bhuiyan; Hasrul Nisham Bin Rosly; Mamun bin Ibne Reaz; Khairun Nisa Minhad; Hafizah Husain
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 5: May 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

The shift register is the heart of the current digital data storage system. Current trends of wireless device designs are to balance the power consumption, cost and portability of the device. The worldwide research is giving emphasize on increasing the amount of memory at minimum possible space to reduce the overall size of the devices now a days. This paper reports a detailed survey on different types of shift registers in CMOS technology from the performance, design and application point of view. It also discusses the technologies available for the design of shift registers with their merits and demerits. This survey will act as a reference for the scientists to design the high-performance memory module. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5207
Discrimination of Chinese Herbal Medicine by Machine Olfaction Dehan Luo; Yawen Shao
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 2: February 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

“Small Sample Size” (SSS) problem would occur while using linear discriminant analysis (LDA) algorithm with traditional Fisher criterion if the within-class scatter matrix is singular. The combination of maximum scatter difference (MSD) criterion and LDA algorithm for solve SSS problem is described. It is employed to detect three kinds of Chinese herbal medicines from different growing areas by machine olfaction. Compared with PCA or PCA + LDA algorithm, the classification result was enhanced. It works out that only a few samples of Anhui Atractylodes are classified incorrectly, however, the classification rate reaches 97.8%. DOI: http://dx.doi.org/10.11591/telkomnika.v11i2.1986
A Smart Method for Monitoring and Scheming Of Road Luminosity Using GSM Equipment Ravichandran G; Krishnamurthy M
Indonesian Journal of Electrical Engineering and Computer Science Vol 9, No 1: January 2018
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v9.i1.pp36-38

Abstract

In our modern life, energy wastage in Streetlight is a big problem faced in walkways and roads during dawn and dusk. These days, the present road light structures are wired which are hard to make and has poor adaptability. During the daytime, the battery gets charged by sun rays, and the energy can be used to power the road lights at night time. The structure regards sun situated cell foundation. It is like manner delineates the usage of remote sensor frameworks using GSM for streetlight checking and control. This system would give remote access to streetlight upkeep and monitoring. It likewise talks about a perceptive framework that takes programmed choices for sparkling control (ON/OFF/DIMMING) considering encompassing light power and time both at a similar minute. The data collected from the sensor is given to the microcontroller of one unit, and at the same time, the SMS is sent through GSM to the Raspberry PI microcontroller to monitor and control the street light.

Page 244 of 923 | Total Record : 9226

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