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                <text>TELKOMNIKA Telecommunication, Computing, Electronics and Control &#13;
Benefits of using TiO2 quantum dots in producing low-cost and high-quality white light-emitting diodes</text>
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                <text>Quantum dots (QDs) is considered as a potential material for the&#13;
improvement of light-emitting diodes (LEDs). However, different from the traditional phosphor materials, they have unique scattering and absorption properties affected by their several nanometers sizes, which makes their application in the production of LED confront more challenges. In addition to this, their influences on QDs-converted LEDs (QCLEDs) are rarely investigated. So as to propose solutions for those problems, in this article, we experimentally and theoretically investigated the impacts of titanium dioxide (TiO2) QDs’ scattering and absorption on the light quality of QCLEDs by drawing a thorough comparison between their properties and the traditional yttrium aluminum garnet phosphors characteristics. The outcomes showed that QCLEDs have poor radiant efficacy and stability due to QDs’ strong characteristic of absorption (reabsorption) while their weak scattering property causes a low uniformity in correlated color temperature (CCT). For achieving high efficiency and stability white LEDs, we highly suggest using QDs with a low concentration to get reductions in the reabsorption and total internal reflection losses. With 0.05 concentration of TiO2 nanoparticles (TiO2 NPs), the white LEDs can simultaneously achieve a high CCT (approximately 7500 K) and a high color rendering index (around 85). </text>
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                <text>Phuc Dang Huu, Phung Ton That, Tran Thanh Trang, Phan Xuan Le, Nguyen Doan Quoc Anh</text>
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                <text>DOI: 10.12928/TELKOMNIKA.v20i3.15347</text>
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                <text>Universitas Ahmad Dahlan</text>
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                <text>Sri Wahyuni</text>
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                <text>ISSN: 1693-6930</text>
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Planar broadband antenna for 2G/3G systemsComputing, Electronics and Control </text>
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                <text>A planar antenna with broadband gestalt is presented for mobile networks. The structure of the antenna is made up of a folded dipole pair with an L-figure microstrip coupling line. The microstrip coupling along with the dipoles are attached on a similar substrate. The radiation parts are plotted at 1.7 GHz, 2.2 GHz, and 2.7 GHz. A flexible coaxial cable made of perfect electric conductor (PEC) material is attached to the L-figure microstrip whereas the outside conductor made up of RO4350B material is attached to the coplanar strip of line. The gain of the antenna is almost 9 dBi. The benefit of the planar structure is that it offers a simple feeding structure and compact size that is necessary for second generation (2G)/third-generation (3G)/long-term evolution (LTE) systems. Finally, the antenna proposed is designed by using computer simulation technology (CST) microwave studio. </text>
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                <text>Ashutosh Singh Chauhan, Priyansh Kasyap, Ankit Gupta, Debani Prasad Mishra, Surender Reddy Salkuti, Seong-Cheol Kim</text>
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                <text>DOI: 10.12928/TELKOMNIKA.v20i3.18977</text>
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                <text>Sri Wahyuni</text>
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                <text>TELKOMNIKA Telecommunication, Computing, Electronics and Control &#13;
Energy-efficient speed profile: an optimal approach with fixed running time </text>
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                <text>Energy-efficient operation methodology, Energy-saving, Metro system, Pontryagin’s maximum principle, Timetable optimization</text>
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                <text>Tracking the optimal speed profile in electric train operation has been&#13;
proposed as an efficient and feasible solution for not only reducing energy consumption, but also no at costs to upgrading the existing railway systems. This paper focuses on finding the optimal speed profile based on Pontryagin’s maximum principle (PMP) while ensuring the fixed running time, and comparing energy saving levels in the cases of applying or not applying PMP. The way to determine the fixed running time also differs from works published is to calculate the total trip time equal to scheduled timetable exactly. Calculating accelerating time ta, coasting time tc, braking time tb via values of maximum speed vh, braking speed vb of optimal speed profile. The other hands, vh and vb are determined by solving nonlinear equations with constraint condition: the running time equal to the demand time. Simulation results with data collected from electrified trains of Cat Linh-Ha Dong metro line, Vietnam show that energy reduction for the entire route when PMP utilization is up to 8.7% and running time complied with scheduled timetables. </text>
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                <text>An Thi Hoai Thu Anh, Nguyen Van Quyen</text>
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                <text>DOI: 10.12928/TELKOMNIKA.v20i3.19525</text>
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A novel wideband circularly-polarized microstrip antenna array based on DGS for wireless power transmission </text>
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                <text>The requirement for applications operating at a variety of frequencies in a unified wireless device has greatly enhanced in recent years. For this&#13;
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presents a new design of a wideband circularly-polarized microstrip antenna array with defected ground structure (DGS). A previous design was introduced which cover the C-band at 5.8 GHz and operates in the industrial scientific medical (ISM) band for wireless communication applications. The proposed antenna has excellent performances which include good input impedance matching with a fed of the circular polarization at 5.8 GHz. The proposed design is validated and optimized by adding a new design of defected ground structure. This aperture geometry enables the antenna to operate in a wideband. The obtained results show that the modified antenna has a good performance in terms of return loss, bandwidth, gain and radiation pattern and demonstrate that the proposed antenna offers a good solution for multi-standard wireless communication applications. </text>
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                <text>DOI: 10.12928/TELKOMNIKA.v20i3.21711</text>
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                <text>Universitas Ahmad Dahlan</text>
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                <text>Sri Wahyuni</text>
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                <text>ISSN: 1693-6930</text>
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Design of UTeM logo-shape wearable antenna for communication application by graphene silver nanocomposites </text>
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                <text>Graphene, Silver, Textile substrate, Wearable antenna, Wireless communication</text>
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                <text>Previously, the antenna conductive patch was made of copper, which was costly, susceptible to multi-fading, bulky, environmentally sensitive, and difficult to produce. Because of their exceptional electrical conductivity and superior strength to metal, while remaining versatile, the miracle nanotechnology of graphene has made them a possible candidate to replace uncompromising copper metallic content. As a result, graphene is incorporated into conductive silver nanocomposites in this work. With the microstrip feeding technology, the suggested antenna design features a logo-shaped made of graphene and silver patch on a textile substrate and radiates at 2.45 GHz frequency. The antenna’s total dimensions are 60×60×1.6 mm. The simulation results were generated using computer simulation technology (CST) studio suite program software, which improved antenna properties including far-fields, return loss, and voltage standing wave ratio (VSWR). Wearable antennas are promising and have a bright future, especially with the advent of wireless communication technologies, so this new design is essential for the materials revolution in advanced communication and IR4.0 applications, as well as wireless sensor&#13;
applications. </text>
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                <text>Ahmad Rifhan Salman, Mohd Muzafar Ismail, Jeefferie Abd Razak, Siti Rosmaniza Ab Rashid</text>
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              <elementText elementTextId="45988">
                <text>DOI: 10.12928/TELKOMNIKA.v20i3.21780</text>
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                <text>Universitas Ahmad Dahlan</text>
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                <text>Sri Wahyuni</text>
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                <text>ISSN: 1693-6930</text>
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                  <text>VOL. 20, NO. 3 2022</text>
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Overall outage event of self-sustaining low-power cooperative relaying networks</text>
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                <text>This paper investigates the implementation of the household low-power&#13;
energy harvesting (LoPEH) wireless sensor networks (WSN) over&#13;
log-normal fading channels. The relays are battery-operated and the&#13;
stochastic harvested energy flow to the batteries is characterized with the Markov property of energy buffer status. The communication is established with the combination of direct link and cooperative relays. The best relay is chosen based on a relay selection (RS) scheme namely optimal relay selection (OPRS). It can be drawn that within a particular range of signal-to-noise ratio (SNR), the energy harvesting (EH) relay-aided protocol can remarkably boost the overall system performance. On the other hand, the study reports how increasing the log-normal channel variance can degenerate the in-studied EH relaying protocol. </text>
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                <text>Hoang-Sy Nguyen, Thanh-Khiet Bui</text>
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                <text>DOI: 10.12928/TELKOMNIKA.v20i3.21925</text>
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                <text>Sri Wahyuni</text>
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                <text>ISSN: 1693-6930</text>
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Recent systematic review on student performance prediction using backpropagation algorithms</text>
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                <text>A comprehensive systematic study was carried out in order to identify various deep learning methods developed and used for predicting student academic performance. Predicting academic performance allows for the implementation of various preventive and supportive measures earlier in order to improve academic performance and reduce failure and dropout rates. Although machine learning schemes were once popular, deep learning algorithms are now being investigated to solve difficult predictions of student performance in larger datasets with more data attributes. Deep neural network prediction methods with clear modelling and parameter measurements formulated on publicly available and recognised datasets are the focus of the research. Widely used for academic performance prediction, backpropagation algorithms have been trained and tested with various datasets, especially those related to learning management systems (LMS) and massive open online&#13;
courses (MOOC). The most widely used prediction method appears to be the standard artificial neural network approach. The long-short-term memory (LSTM) approach has been reported to achieve an accuracy of around 87 percent for temporal student performance data. The number of papers that study and improve this method shows that there is a clear rise in deep learning-based academic performance prediction over the last few years. </text>
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                <text>Edi Ismanto, Hadhrami Ab Ghani, Nurul Izrin Md Saleh, Januar Al Amien, Rahmad Gunawan</text>
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Comparative study of extraction features and regression algorithms for predicting drought rates</text>
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                <text>Rice is the primary staple food source for Indonesian people, with&#13;
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normalized difference vegetation index (NDVI) and the normalized&#13;
difference water index (NDWI) in describing rice fields’ dryness. Moreover, using the random forest regression algorithm. This research compares NDVI with NDWI using data originating from Sentinel-2A and retrieved via the google earth engine. Regression algorithms are used in research to predict drought in paddy fields. This research shows that NDVI is better than NDWI in predicting drought using random forest regression algorithms and logistic regression algorithms. The random forest regression algorithm based on the results obtained shows that the average root mean square error (RMSE) on NDVI is 0.018, and NDWI is 0.012. Based on the logistic regression algorithm results, it was found that the average value of RMSE on NDVI was 0.346, and NDWI was 0.336. Based on the results of the RMSE, it shows that the forecasting ability of the random forest regression algorithm is better than the logistic regression. </text>
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                <text>Irza Hartiantio Rahmana, Amalia Rizki Febriyani, Indra Ranggadara, Suhendra, Inna Sabily Karima</text>
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                <text>DOI: 10.12928/TELKOMNIKA.v20i3.23156</text>
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                <text>Sri Wahyuni</text>
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                <text>ISSN: 1693-6930</text>
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Design of a microstrip antenna patch with a rectangular slot for 5G applications operating at 28 GHz</text>
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                <text>In this paper, we present a study and design of a rectangular-shaped&#13;
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frequency is 28GHz, for fifth generation (5G) wireless applications, using&#13;
the microstrip line technique for feeding. The objective of this slot is to&#13;
contribute to the improvement of antenna performance. This antenna is built on a Roger RT duroid 5880 type substrate having a relative permittivity equal to 2.2, a height of h = 0.5 mm, and a loss tangent of 0.0009. The compact size of this antenna is 4.2 mm × 3.3 mm × 0.5 mm. The simulations of this antenna were performed using high-frequency structure simulator (HFSS) and computer simulation technology (CST) software whose main purpose is to confirm the results obtained for this proposed antenna. The results obtained during these simulations are as follows: resonant frequency of 27.97 GHz and reflection coefficient (S11) of -20.95 dB, bandwidth of 1.06 GHz, a gain of 7.5 dB, radiated power of 29.9 dBm, and efficiency of 99.83%. These results obtained by this proposed antenna are better than those obtained from already existing antennas that are published in current scientific journals. Consequently, this antenna is likely to satisfy the needs for 5G wireless communication applications. </text>
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                <text>Salah-Eddine Didi, Imane Halkhams, Mohammed Fattah, Younes Balboul, Said mazer, Moulhime El Bekkali</text>
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                <text>DOI: 10.12928/TELKOMNIKA.v20i3.23159</text>
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                <text>Universitas Ahmad Dahlan</text>
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                <text>Sri Wahyuni</text>
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