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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
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Sparse Representation for Detection of Microcalcification Clusters Xinsheng Zhang; Minghu Wang
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

To improve the performance of microcalcification clusters (MCs) detection, we present an approach to detect MCs in mammograms by casting the detection problem as finding sparse representations of test samples with respect to training samples. The ground truth training samples of MCs in mammograms are assumed to be known as a priori. The sparse representation is computed by the l1-regularized least square approach using the interior-point method. The new method based on sparse representation expresses each testing sample as a linear combination of all the training samples. The sparse coefficient vector is obtained by l1-regularized least square through learning. MCs classification is achieved by defining discriminating functions from the sparse coefficient vector for each category. To investigate its performance, the proposed method is applied to DDSM datasets and compared with support vector machines (SVMs) and twin support vector machines (TWSVMs). The experimental results have shown that the performance of the proposed method is comparable with or better than those methods. In addition, the proposed method is more efficient than SVMs and TWSVMs based methods as it has no need of model selection and parameter optimization. DOI: http://dx.doi.org/10.11591/telkomnika.v10i3.616
A Fuzzy Controller for Compensation of Voltage SAG/SWELL Problems Using Reduced Rating Dynamic Voltage Restorer Rajesh Damaraju; S.V.N.L. Lalitha
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.pp407-414

Abstract

Non linear loads are highly effected by variations in voltages. Dynamic voltage restorer is one of the most popular compensating devices due to its low cost and better performance. Usage of Park’s transformation technique effectively reduces the rating of Dynamic voltage restorer. Application of fuzzy logic controller for getting the better result is proposed in this paper. The results are verified in Matlab/Simulink environment.
Investigation of practical representation and parameterization of the rational cubic conic sections Houjun Hang; Ru Chou
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

This paper presents a practical representation containing a parameter of rational cubic conic sections and researchs deeply the inner properties. Firstly,The parameter how to affect the control points, inner weights and shoulder point is discussed. Secondly,the inner relation between the parameter and the weights of the nonstandard-form quadratic rational conic sections is analysed in detail. Change in the parameter value actually corresponds to a rational linear parameter transformation. Finally, we discuss the inverse calculation of the cubic rational conic sections and obtain the inverse calculation methods suitable for engineering applications. DOI: http://dx.doi.org/10.11591/telkomnika.v11i1.1863
Low Cost Quasi Binary Weighting Addition Log-SPA LDPC Decoders Po-Hui Yang; Ming-Yu Lin
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 5: May 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper proposes a new addition method, which can be applied to reduce the hardware cost of LDPC decoders using log-SPA, which traditionally has the best lowest bit error rate (BER) but the highest hardware requirement. The proposed quasi-binary weighting addition can be simply implemented by OR gates. With auxiliary pseudo-carry circuit, the BER performance can reach a fair level. In the log-SPA message-passing path, numeric transform reduction architecture is proposed for further hardware reduction. Synthesized and numerical results show that the new proposed architecture achieved an up to 32% and 18% total hardware reduction, compared with traditional log-SPA decoders, and the simplest sign-min architecture, respectively, with fair BER performance. DOI: http://dx.doi.org/10.11591/telkomnika.v11i5.2505
Role of Solar Power in Sustainable Development of India Moumita Sadhu; Suprava Chakraborty; Niladri Das; Pradip Kumar Sadhu
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 1: April 2015
Publisher : Institute of Advanced Engineering and Science

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Abstract

Bulk group of rural households, dependency on insufficient and poor quality energy sources are the features of Indian energy consumption pattern. Sustainability is the move towards the growth and development of India. Solar Energy is one of the renowned sectors to support the sustainability of India. Solar energy has giant potential in India due to its position in tropical belt. This paper deals with the new innovative applications of solar energy for sustainable development of India. Solar application in transportation, architecture, car parking, restaurants, lighting, mobile charging etc are described for sustainable development. The paper includes the existing applications of solar energy, the current status of solar energy in India, challenges in the progress of solar energy and concludes with some solutions to promote solar energy. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7668 
Dual Quaternion Blending Algorithm and Its Application in Character Animation Xiang Feng; Wanggen Wan
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 10: October 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

In this paper we generalize established techniques and blending algorithm for quaternions to dual quaternions to include all rigid transformations, and implement real-time character animation with dual quaternions under the platform of OpenGL. Classical quaternions are restricted to the representation of rotations although combination of matrix calculation and quaternions operator has been a popular tool in character animation since 1990s. In character animation and some other applications of 3D computer graphics, we are actually faced with rigid transformation which just includes translation and rotation. Similar to the way quaternions represent rotations, dual quaternions represent rigid transformations. Algorithms based on dual quaternions own better properties than those based on quaternions in practical applications, which include reduced overhead, increased computational efficiency and coordinate invariance.. Finally we demonstrate the effectiveness and superiority of dual quaternions blending algorithm by cartoon male and female mesh models with the animation of walking and waving. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3339
A Multicore Load Balancing Model Based on Java NIO Yang Wang; Guofeng Qin
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 6: October 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

First this paper points out two common problems of utilizing processors under multicore architecture, namely processors waiting for IO operation to finish and load balancing among cores. Then it makes an analysis of the reasons for them. In order to fully exploit multicore processors, this paper proposes a multicore load balancing model based on the Java NIO framework which offers a solution to above problems. This model mainly illustrates a task scheduling algorithm which uses a parallel computing framework, Java Fork/Join. At last, experiments and performance analysis prove the effectiveness of this model in utilizing the multicore processors. Although the model is constructed under the architecture of Java language, it can be extended to other languages without much being changed. DOI: http://dx.doi.org/10.11591/telkomnika.v10i6.1431
Effects of lightning impulse front time on substation grounding system performance Muhammad Adnan; Zulkurnain Adul Malek; Nur Syazwani Mohd Din; Muhammad Irfan Jambak; Zainuddin Nawawi; Muhammad Abu Bakar Sidik
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 2: November 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i2.pp569-574

Abstract

The role of the grounding system in the safety of the power system and protection of personnel is obvious during an unexpected short circuit or lightning discharge at the substation. The aim of this work is to analyze the effects of several parameters: lightning impulse front time, soil resistivity and types of grid materials on the grounding system of the Substation. The ground potential rise (GPR), touch voltage and step voltage of a 50 m x 60 m grounding grid buried at a depth of 0.5 m were computed using CDEGS when injected by impulse with different front times. Results show that the shorter the front time of lightning impulse waveform, the higher the value of GPR, touch voltage and step voltage. Meanwhile, when the value of soil resistivity is increased, the value of GPR, touch voltage and step voltage is also increased. Lastly, different types of grid conductor materials give different values of GPR, touch voltage and step voltage. However, it can be said that the differences are too small to be of any significance. 
An Improved-Hash Based Multi Dimensional Distributed Index Mechanism Haiwen Han; Deyu Qi; Weiping Zheng
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 4: April 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

Data partition and the accordingly index technologies which could result in uniform data distribution and fast data finding are critical in high parallelism for shared nothing architecture to minimize the transaction processing time. An improved-hash based multi dimensional index mechanism is present in this paper to achieve high parallelism performance for distributed data-parallel computation in shared nothing architecture. After partitioning and storing data using improved-hash function based on partitioning column, the multi dimensional indexes based on multi columns and the corresponding data lookup procedure are constructed. Afterwards, the space complexity and time complexity are analyzed. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2359  
Performance of Coded Modulation in Multicarrier CDMA System Linda Meylani; Nur Andini; Iswahyudi Hidayat
Indonesian Journal of Electrical Engineering and Computer Science Vol 1, No 3: March 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v1.i3.pp583-589

Abstract

Coded modulation scheme introduce robust and reliable system. It combine coding and modulation in one system. This paper show performance of coded modulation with coding rate 2/3, using 8PSK and convolutional coding that implemented in MC CDMA system. MC CDMA is one of multicarrier system  that combine OFDM and CDMA so its offer reliable system in frequency selective fading. Decoding process for coded modulation is done by using log likelihood ratio for least significant bit (define the subset) and the entire bits (member of subset). Simulation result shown that coded modulation in MC CDMA system have a good performance in flat fading and frequency selective fading.  

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