Indonesian Journal of Electrical Engineering and Informatics (IJEEI)
Indonesian Journal of Electrical Engineering and Informatics (IJEEI) is a peer reviewed International Journal in English published four issues per year (March, June, September and December). The aim of Indonesian Journal of Electrical Engineering and Informatics (IJEEI) is to publish high-quality articles dedicated to all aspects of the latest outstanding developments in the field of electrical engineering. Its scope encompasses the engineering of Telecommunication and Information Technology, Applied Computing & Computer, Instrumentation & Control, Electrical (Power), Electronics, and Informatics.
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<![CDATA[State of charge estimation based on adaptive algorithm for Lead-Acid battery ]]>
<![CDATA[Maamar Souaihia]]>;
<![CDATA[Bachir Belmadani]]>;
<![CDATA[Rachid Taleb]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.1002
<![CDATA[The usage of batteries in recent years has become widespread in many fields e.g. in electric vehicles, energy renewable and stand-alone systems which require a robust approach for estimation of the state of charge (SOC). The SOC represents an important factor to guaranty safe operations. A lot of methods have been used to predict the state of charge. The coulomb counting method is the famous and widely used among them, but have limitation due to its accuracy. Another used approach is the Kalman Filter, which improves the estimation efficiency, to reach a good performance in SOC prediction. The version of adaptive extended Kalman filter (AEKF) technique is applied in this paper. This paper presents an experimental performance of technique of Kalman filter, for solving the problem of accurate SOC. The method is used to compute the terminal voltage in such a way to estimate the SOC. The proposed algorithm is based on preselected Thevenin model after the identification of its parameters. It has been used to predict the SOC based on nonlinear equations, and evaluation of the approach is verified with the experimental results. The final results signify that the estimation matched with the proposed model and the algorithm is performed optimally, thus the maximum soc estimation error is the finest]]>
<![CDATA[Nonlinear observer based PI sliding surface of adaptive sliding mode control for boost converter in PV system ]]>
<![CDATA[Ramadhani Kurniawan Subroto]]>;
<![CDATA[Lunde Ardhenta]]>;
<![CDATA[Eka Maulana]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.1165
<![CDATA[In photovoltaic system, solar energy is not able to be directly utilized to the grid. This is because the the generated output voltage from solar array are fluctuating depends on the environmental condition, such as the intensity of solar irradiance and temperature. Any changes from those variables will affect the generated output voltage. Boost converter is one type of power converter that is able to regulate the output voltage of solar array to dc grid. However, the dynamics of boost converter is nonlinear and non-minimum phase. Therefore, it requires an appropriate control method that can force the output voltage follows the desired reference voltage, by considering the fluctuation of environmental conditions and loads. To reduce the number of sensors and cost investment, nonlinear observer technique is employed to estimate the input voltage and load variations. By considering this problem, this paper is aimed at designing nonlinear observer based on adaptive sliding mode control with PI sliding surface for boost converter. The stability of proposed system is investigated through analytical and simulation proof. As comparison with PID controller, the performance of proposed system has produced Integral Absolute Error (IAE) about 7 times smaller than PID controller when it is tested under various conditions.]]>
<![CDATA[Comparison of multi-distance signal level difference Hjorth descriptor and its variations for lung sound classifications ]]>
<![CDATA[Achmad Rizal]]>;
<![CDATA[Risanuri Hidayat]]>;
<![CDATA[Hanung Adi Nugroho]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.771
<![CDATA[A biological signal has the multi-scale and signals complexity properties. Many studies have used the signal complexity calculation methods and multi-scale analysis to analyze the biological signal, such as lung sound. Signal complexity methods used in the biological signal analysis include entropy, fractal analysis, and Hjorth descriptor. Meanwhile, the commonly used multi-scale methods include wavelet analysis, coarse-grained procedure, and empirical mode decomposition (EMD). One of the multi-scale methods in the biological signal analysis is the multi-distance signal level difference (MSLD), which calculates a difference between two signal samples at a specific distance. In previous studies, MSLD was combined with Hjorth descriptor for lung sound classification. MSLD has the potential to be developed by modifying the fundamental equation of MSLD. This study presents the comparison of MSLD and its variations combined with Hjorth descriptor for lung sound classification. The results showed that MSLD and its variations had the highest accuracy of 98.99% for five lung sound data classes. The results of this study provided several alternatives for multi-scale signal complexity analysis method for biological signals.]]>
<![CDATA[A confocal microwave imaging implementation for breast cancer detection ]]>
<![CDATA[Nirmine Hammouch]]>;
<![CDATA[Hassan Ammor]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.806
<![CDATA[Breast cancer affects many women in many ways. Early diagnosis is the most important key for detecting malignant tissue. In this paper, we present the design of a microstrip patch antenna for ultra wide band (UWB) biomedical applications covering the full range of FCC frequencies (3.1 GHz to 14 GHz). We have used a single antenna with various positions to scan the whole breast phantom. A confocal microwave imaging (CMI) algorithm has been implemented and applied to create a 2D image of the tumor. The results obtained suggest the feasibility of using CMI method for detecting small breast tumors with high precision and more safety.]]>
<![CDATA[Effect of clock gating in conditional pulse enhancement flip-flop for low power applications ]]>
<![CDATA[Kuruvilla John]]>;
<![CDATA[Vinod Kumar R. S.]]>;
<![CDATA[Kumar S. S.]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.1041
<![CDATA[Flip-Flops (FFs) play a fundamental role in digital designs. A clock system consumes above 25% of total system power. The use of pulse-triggered flip-flops (P-FFs) in digital design provides better performance than conventional flip-flop designs. This paper presents the design of a new power-efficient implicit pulse-triggered flip-flop suitable for low power applications. This flip-flop architecture is embedded with two key features. Firstly, the enhancement in width and height of triggering pulses during specific conditions gives a solution for the longest discharging path problem in existing P-FFs. Secondly, the clock gating concept reduces unwanted switching activities at sleep/idle mode of operation and thereby reducing dynamic power consumption. The post-layout simulation results in cadence software based on CMOS 90-nm technology shows that the proposed design features less power dissipation and better power delay performance (PDP) when compared with conventional P-FFs. Its maximum power saving against conventional designs is up to 30.65%.]]>
<![CDATA[Channel sharing utility function of power control game in cognitive femtocell network ]]>
<![CDATA[Anggun Fitrian Isnawati]]>;
<![CDATA[Risanuri Hidayat]]>;
<![CDATA[Selo Sulistyo]]>;
<![CDATA[I Wayan Mustika]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.1163
<![CDATA[The use of sharing channel simultaneously has become the trend in telecommunication technology particularly in network with distributed users as the allocation of frequency spectrum becomes more crowded. The proposed power control method in cognitive femtocell network is based on game theory (commonly known as power control game, PCG). This method uses utility function formula as the goal of game theory for power strategy in power update process. Utility function formula of Proposed PCG includes channel sharing factor that aimed to accommodate the system requirement of channel sharing. The result showed that the implementation of channel factor is inversely proportional to the signal to noise and interference ratio (SINR) and transmit power, but proportional to utility function. In comparison of user transmit power and SINR with two other methods, can also be conclude that Proposed PCG was able to achieve SINR of 5.49 dB and above the SINR target 5 dB, while the Thalabani (TB) and Koskie-Gajic (KG) were only able to achieve respective SINR of 4.87 dB and 4.98 dB. It can be concluded that the Proposed PCG was better in achieving the SINR target. It means that the quality of service in this system can be fulfilled properly.]]>
<![CDATA[Application of diverse FACTS in AGC of multi-area interconnected energy systems ]]>
<![CDATA[Gulshan Sharma]]>;
<![CDATA[Kabulo Loji]]>;
<![CDATA[Musasa Kabeya]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.1056
<![CDATA[This article presents the simple and effective control design for active power regulation of modern energy delivery system. As an energy delivery system experiences the demand changes as per the demand of the modern energy users due to which the system frequency is highly troubled and fluctuating. To balance such demand changes and to stable the system occurrence fluctuations, the thyristor control phase shifter (TCPS) in synchronisation with super conducting magnetic energy storage (SMES) or TCPS in coordination with capacitive energy storage (CES) based model predictive control (MPC) technique are proposed. SMES-SMES and CES-CES configurations are also tested for energy delivery system. The effectiveness of the proposed system regulator design are guaranteed by analyzing the transient system performance under varying load pattern, sinusoidal load change and for system non-linearities. A comparative performance analysis between TCPS-SMES, TCPS-CES, SMES-SMES and CES-CES based MPC of energy system are tested and presented.]]>
<![CDATA[A Bridge between Legacy Wireless Communication Systems and Internet of Things ]]>
<![CDATA[Samer Jaloudi]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.979
<![CDATA[The software-defined radio (SDR) is a flexible platform that can adapt to various wireless telecommunication frequencies. It is able to provide a reconfigurable communication infrastructure for wireless systems. Hence, SDR is proposed here as a bridge between legacy wireless communication systems and the Internet of Things (IoT) via standard telecommunication protocols. The standard protocols are hypertext transfer protocol (HTTP), simple mail transfer protocol (SMTP), and message queuing telemetry transport (MQTT). Data collected from legacy wireless systems have been formatted via JavaScript object notation (JSON) for interoperability and categorized according to the application and the communication pattern. The extracted data are then transferred over MQTT for machine-to-machine (M2M) communication, over SMTP for machine-to-human (M2H) notification, and over HTTP for human-to-machine (H2M) communication. However, received audio signals from FM-based broadcasting stations have been transferred to the Internet servers over extensible messaging and presence protocol (XMPP), in live audio streaming. The objective is to introduce an SDR-IoT bridge that is inexpensive, scalable, and interoperable. The analyses show that the environment has good-performance, and can be used for many applications of smart city sectors, for Internet Radio, and for Internet-based monitoring of airplanes and vessel navigation.]]>
<![CDATA[Influence of single vacancy defect at varying length on electronic properties of zigzag graphene nanoribbons ]]>
<![CDATA[Kien Liong Wong]]>;
<![CDATA[Mu Wen Chuan]]>;
<![CDATA[Wee Khang Chong]]>;
<![CDATA[Afiq Hamzah]]>;
<![CDATA[Mohd Shahrizal Bin Rusli]]>;
<![CDATA[Nurul Ezaila Binti Alias]]>;
<![CDATA[Cheng Siong Lim]]>;
<![CDATA[Michael Tan]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.1138
<![CDATA[Graphene, identified in 2004, is now an established two-dimensional (2D) material due to its outstanding physical and electronic characteristics namely its superior electrical conductivity. Graphene is a zero-gap material that has linear dispersion with electron-hole symmetry. As pristine sheet, it cannot be utilized in digital logic application without the induction of a band gap inside the band structure. In our work, the modeling and simulation of graphene nanoribbons (GNRs) are carried out to determine its electronics properties that are benchmarked with other published simulation data. A 4-Zigzag GNRs (4-ZGNRs) under different length are utilized. A single vacancy defects is introduced at various positions inside the atomic structure. The theoretical model is implemented based on single-neighbour tight binding technique coupled with a non-equilibrium Green’s function formalism. The single vacancy defects are represented by the elimination of tight binding energies in the Hamiltonian matrix. Subsequently, these matrix elements are utilized to compute dispersion relation and density of states (DOS) through Green’s function. It is found that single vacancy defects at different positions in 4-ZGNRs’ atomic structure under varying length has no significant impacts on the sub-band structure but these vacancies impact the DOS that are computed throught Green’s function approach.]]>
<![CDATA[Floral structure for textile-based metamaterial absorber ]]>
<![CDATA[Siti Nurzulaihan Isa]]>;
<![CDATA[Osman Ayop]]>;
<![CDATA[Farid Zubir]]>;
<![CDATA[Noor Asniza Murad]]>;
<![CDATA[Mohammad Kamal A. Rahim]]>
<![CDATA[ Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 7, No 2: June 2019 ]]>
Publisher : <![CDATA[IAES Indonesian Section ]]>
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DOI: 10.52549/ijeei.v7i2.1171
<![CDATA[Based on an annulled circle structure metamaterial absorber (MMAb), a floral structure MMAb design is proposed for performance improvement especially on absorptivity. Since the initial purpose of designing the MMAb is for hiding one’s existence from electromagnetic motion detector, it is expected that the MMAb will has flexibility as one of its characteristics. The MMAb composes of textile-based substrate in between floral structure at the top and ground plane at the bottom, based on metallic plate. The targeted center frequency is 10.525 GHz and through series of simulation done in CST Microwave Software, the MMAb can reach up to 97.03% of absorptivity. The operating angle can be extended at least 68o before its absorptivity deteriorated below 80%. In addition, the proposed MMAb has a high absorptivity regardless of the polarization angle of the electromagnetic waves.]]>
