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<![CDATA[Quantum Dot-sensitized Solar Cells: A Review ]]>
<![CDATA[Pooja Bhambhani]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 7, No 1: March 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v7i1.841
<![CDATA[Quantum dot-sensitized solar cell (QDSSC) has an analogous structure and working principle to the dye sensitizer solar cell (DSSC). It has drawn great attention due to its unique features, like multiple exciton generation (MEG), simple fabrication and low cost. The power conversion efficiency (PCE) of QDSSC is lower than that of DSSC. To increase the PCE of QDSSC, it is required to develop new types of working electrodes, sensitizers, counter electrodes and electrolytes. This review highlights recent developments in QDSSCs and their key components, including the photoanode, sensitizer, electrolyte and counter electrode.]]>
<![CDATA[Fabrication of (Polymer Blend-magnesium Oxide) Nanoparticle and Studying their Optical Properties for Optoelectronic Applications ]]>
<![CDATA[Alaa J. Kadham]]>;
<![CDATA[Dalal Hassan]]>;
<![CDATA[Najlaa Mohammad]]>;
<![CDATA[Ahmed Hashim Ah-yasari]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 7, No 1: March 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v7i1.839
<![CDATA[Nanocomposites used in many optical devices applications. This aims to preparation of new type of polymer and study their optical properties. The polyvinyl pyrrolidone-carboxymethyl cellulose blend and magnesium oxide nanocomposites have been fabricated. The nanocomposites are prepared for different concentrations of polymer blend and magnesium oxide nanoparticles. The optical properties of nanocomposites were studied. The experimental results showed that the absorbance, absorption coefficient, refractive index, extinction coefficient, real and imaginary parts of dielectric constant and optical conductivity of (PVP-CMC) blend are increased with increase of the MgO nanoparticles concentration. The transmittance and energy band gap are decreased with increase of the MgO nanoparticles concentration. The nanocomposites have high absorbance in UV region which may be used for radiation shielding application.]]>
<![CDATA[Business Process Improvement of Production Systems Using Coloured Petri Nets ]]>
<![CDATA[Imam Mukhlash]]>;
<![CDATA[Widya Nilam Rumana]]>;
<![CDATA[Dieky Adzkiya]]>;
<![CDATA[Riyanarto Sarno]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 7, No 1: March 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v7i1.845
<![CDATA[The quality of information systems affects the company's business performance. Therefore, it is necessary to analyze business processes to determine any discrepancies between the planned business processes and the actual ones. Based on the results of this analysis, the business process can be improved. The fundamental factor of manufacturing companies is production process. In reality, there are many discrepancies between the actual business processes with the pre-planned, so that there should be analyzed. The analysis can be performed by modeling the business process using Coloured Petri Nets (CPN). In this study, the objectives are to determine the level of conformance checking of business processes, reachability graph and the bottleneck analysis. The results of the analysis are used to construct a recommended model. Based on the analysis of the case study, e.g. a steel industry in Indonesia, the recommended model has a better value than initial model.]]>
<![CDATA[Throughput and Handover Latency Evaluation for Multicast Proxy Mobile IPV6 ]]>
<![CDATA[Aisha Hashim]]>;
<![CDATA[Azana Hafizah Mohd Aman]]>;
<![CDATA[Huda Adibah Mohd Ramli]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 6, No 4: December 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v6i4.850
<![CDATA[The objective of this paper is to present performance analysis of a new enhanced mobile multicast network mobility management scheme. The initial developed network mobility management called Proxy Mobile IPv6 (PMIPv6) is based on unicast network support. This paper enabled multicast support in network mobility management and named it as MPMIPv6. Additionally this enhancement also provides better network performance with the new context transfer operations and fast reroute operations. In brief, this paper also describes other current mobile multicast schemes. The new scheme is evaluated using mathematical analysis and NS3.19 simulator. Theoretically this scheme reduces service recovery time, total signalling cost, handover latency, and packet loss for multicast communication. However for this paper, the analysed parameters are throughput and handover latency. Both mathematical and simulation results exhibit better network performance for multicast environment compared to the standard benchmark scheme.]]>
<![CDATA[Content Cytotoxicity Studies of Colorectal Carcinoma Cells Using Printed Impedance Sensors ]]>
<![CDATA[Anis Nurashikin Nordin]]>;
<![CDATA[Irmanisha Ibrahim]]>;
<![CDATA[Ahmad Fairuzabadi Mohd Mansor]]>;
<![CDATA[Yumi Zuhanis Has-Yun Hashim]]>;
<![CDATA[Ioana Voiculescu]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 6, No 4: December 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v6i4.851
<![CDATA[Monitoring the effectiveness of drugs on cancer cells is crucial for chemotherapeutics studies. In-vitro cell-based biosensors can be used as an alternative for characteristic studies of cells’ response to drugs. Cell-based sensors provide real-time measurements and require smaller sample volumes compared to conventional T-flask measurement methods. This paper presents a biosensor that detects in real-time, impedance variations of human colon cancer, HCT-116 cells when treated with anti-cancer agent, 5-Fluorouracil (5-FU). Two different extracellular matrix (ECM); polyaniline and gelatin were tested and evaluated in terms of attachment quality. Polyaniline was found to provide the best attachment for HCT-116 cells and was used for cytotoxicity studies. Cytokinetic behavior indicated that 5-FU inhibited HCT-116 cells at IC50 of 6.8 µg/ mL. Trypan blue exclusion method for testing cell viability was used to validate the impedance measurements, where the cancer cell concentrations were reduced to ~35% when treated with 2.5 µg/mL, and 50% when treated with 6.8 µg/mL. The results generated by the microfabricated impedance biosensor are comparable to the Trypan blue method since both gave similar cell growth trend. It can be concluded that the impedance biosensor has potential to be used as an alternative method in drug testing applications.Monitoring the effectiveness of drugs on cancer cells is crucial for chemotherapeutics studies. Invitrocell-based biosensors can be used as an alternative for characteristic studies of cells’ response todrugs. Cell-based sensors provide real-time measurements and require smaller sample volumescompared to conventional T-flask measurement methods. This paper presents a biosensor that detects inreal-time, impedance variations of human colon cancer, HCT-116 cells when treated with anti-canceragent, 5-Fluorouracil (5-FU). Two different extracellular matrix (ECM); polyaniline and gelatin were testedand evaluated in terms of attachment quality. Polyaniline was found to provide the best attachment forHCT-116 cells and was used for cytotoxicity studies. Cytokinetic behavior indicated that 5-FU inhibitedHCT-116 cells at IC50 of 6.8 μg/mL. Trypan blue exclusion method for testing cell viability was used tovalidate the impedance measurements, where the cancer cell concentrations were reduced to ~35% whentreated with 2.5 μg/mL, and 50% when treated with 6.8 μg/mL. The results generated by themicrofabricated impedance biosensor are comparable to the Trypan blue method since both gave similarcell growth trend. It can be concluded that the impedance biosensor has potential to be used as analternative method in drug testing applications.]]>
<![CDATA[Content Comparative Investigation on Tool Wear During End Milling of AISI H13 Steel with Different Tool Path Strategies ]]>
<![CDATA[Erry Yulian T. Adesta]]>;
<![CDATA[Muhammad Riza]]>;
<![CDATA[Avicenna Avicenna]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 6, No 4: December 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v6i4.852
<![CDATA[Tool wear prediction plays a significant role in machining industry for proper planning and control machining parameters and optimization of cutting conditions. This paper aims to investigate the effect of tool path strategies that are contour-in and zigzag tool path strategies applied on tool wear during pocket milling process. The experiments were carried out on CNC vertical machining centre by involving PVD coated carbide inserts. Cutting speed, feed rate and depth of cut were set to vary. In an experiment with three factors at three levels, Response Surface Method (RSM) design of experiment with a standard called Central Composite Design (CCD) was employed. Results obtained indicate that tool wear increases significantly at higher range of feed per tooth compared to cutting speed and depth of cut. This result of this experimental work is then proven statistically by developing empirical model. The prediction model for the response variable of tool wear for contour-in strategy developed in this research shows a good agreement with experimental work.]]>
<![CDATA[Neural Network Based Prediction of Stable Equivalent Series Resistance in Voltage Regulator Characterization ]]>
<![CDATA[Mohd Hairi Mohd Zaman]]>;
<![CDATA[M. M. Mustafa]]>;
<![CDATA[M. A. Hannan]]>;
<![CDATA[Aini Hussain]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 7, No 1: March 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v7i1.857
<![CDATA[High demand on voltage regulator (VR) currently requires VR manufacturers to improve their time-to-market, particularly for new product development. To fulfill the output stability requirement, VR manufacturers characterize the VR in terms of the equivalent series resistance (ESR) of the output capacitor because the ESR variation affects the VR output stability. The VR characterization outcome suggests a stable range of ESR, which is indicated in the ESR tunnel graph in the VR datasheet. However, current practice in industry manually characterizes VR, thereby increasing the manufacturing time and cost. Therefore, an efficient method based on multilayer neural network has been developed to obtain the ESR tunnel graph. The results show that this method able to reduce the VR characterization time by approximately 53% and achieved critical ESR prediction error less than 5%. This work demonstrated an efficient and effective approach for VR characterization in terms of ESR.]]>
<![CDATA[Development of Intelligent Multi-agents System for Collaborative e-learning Support ]]>
<![CDATA[Issam Matazi]]>;
<![CDATA[Rochdi Messoussi]]>;
<![CDATA[Salah-Eddine Bellmallem]]>;
<![CDATA[Ilham Oumaira]]>;
<![CDATA[Abdellah Bennane]]>;
<![CDATA[Raja Touahni]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v7i2.860
<![CDATA[The aim of this paper is the introduction of intelligence in e-learning collaborative system. In such system, the tutor plays an important role to facilitate collaboration between users and boost less active among them to get more involved for good pedagogical action. However, the problem lies in the large number of platform users, and the tutor tasks become difficult if not impossible. Therefore, we used fuzzy logic technics in order to solve this problem by automating tutor tasks and creating an artificial agent. This agent is elaborate in basing on the learners activities, especially the assessment of their collaborative behaviors. After the implementation of intelligent collaborative system by using Moodle platform, we have tested it. The reader will discover our approach and relevant results.]]>
<![CDATA[Satellite Image Enhancement Using Dual Tree Complex Wavelet Transform ]]>
<![CDATA[C. Periyasamy]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 6, No 4: December 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v6i4.861
<![CDATA[Drawback of losing high frequency components suffers the resolution enhancement. In this project, wavelet domain based image resolution enhancement technique using Dual Tree Complex Wavelet Transform (DT-CWT) is proposed for resolution enhancement of the satellite images. Input images are decomposed by using DT-CWT in this proposed enhancement technique. Inverse DT-CWT is used to generate a new resolution enhanced image from the interpolation of high-frequency sub band images and the input low-resolution image. Intermediate stage has been proposed for estimating the high frequency sub bands to achieve a sharper image. It has been tested on benchmark images from public database. Peak Signal-To-Noise Ratio (PSNR) and visual results show the dominance of the proposed technique over the predictable and state-of-art image resolution enhancement techniques.]]>
<![CDATA[Smart Grid Systems Based Survey on Cyber Security Issues ]]>
<![CDATA[R. Dorothy]]>;
<![CDATA[Sasilatha Sasilatha]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 6, No 4: December 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v6i4.862
<![CDATA[The future power system will be an innovative administration of existing power grids, which is called smart grid. Above all, the application of advanced communication and computing tools is going to significantly improve the productivity and consistency of smart grid systems with renewable energy resources. Together with the topographies of the smart grid, cyber security appears as a serious concern since a huge number of automatic devices are linked through communication networks. Cyber attacks on those devices had a direct influence on the reliability of extensive infrastructure of the power system. In this survey, several published works related to smart grid system vulnerabilities, potential intentional attacks, and suggested countermeasures for these threats have been investigated.]]>
