AT the end of 2023, unfortunately, one of our invaluable\nmembers, Prof. Aleksandar Pajkanovic, had to pursue\na path separate from the one we blazed together during the\npassed years. Prof. Pajkanovic served as a Managing Editor\nof the “Electronics”journal for many years and contributed to\nits quality and development in many different ways. However,\nas it sometimes happens in life, other priorities, challenges\nand opportunities come up and interfere during the journey.\nHereby, I would like to thank Aleksandar for all the hard work\nhe invested in the journal and our cooperation, hoping that he\nmay come back even stronger and more motivated. I wish him\nsuccess and all best in his future endeavors.<\/h5>\n
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\nIn December issue, we bring you four new papers that cover\ndiverse topics related to electronics systems.<\/h5>\n
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\nThe first paper, entitled \u201cIntelligent Optimization of CMOS\nOperational Amplifier using 3D Ant Colony Optimization,\u201d\n\nauthored by S. Barra, presents the use of an artificial intelli-\ngence (AI) tool based on Ant Colony Optimization (ACO) for\n\ndesigning an operational amplifier (OPAMP) circuit. The aut-\nhor proposed a new meta-heuristic method to automate analog\n\ncircuit design. The method uses ACO and Cadence Spectre as\ndimensioning and implementation platform, respectively. The\npresented results demonstrate its effectiveness in sizing basic\nand more complex analog circuits.<\/h5>\n
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\nIn the paper entitled \u201cA Singly Curved Conformal Phased\nArray with Integrated Particles-Based CRLH Phase Shifters,\u201d\nby M. Ayaz and I. Ullah, the authors proposed a four\n\nunit cell micron-sized magnetic particles embedded compo-\nsite right\/left-handed (CRLH) transmission line meta-material\n\nphase shifter. A prototype of the phase shifter is designed,\nfabricated and tested for phase shifter applications. The phase\nresponse obtained by measurements shows close agreement\nwith the simulation results. Additionally, for the performance\n\nanalysis of proposed phase shifter, a 1×4 conformal curved-\nshaped phased array operating at 5.8 GHz is fed with the four\n\nunit cell cascaded phase shifter in CST full-wave simulator.\nThe conformal phased array with the proposed integrated\nphase shifters was simulated for broadside pattern correction\nand main beam scanning at 20 degree on curved-shaped\n\nsurface with different bend angles. The radiation pattern results\nobtained with the proposed integrated phase shifters are in\nclose agreement with those obtained with direct excitation of\nthe array.<\/h5>\n
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\nRegarding the third paper, \u201cEthereum Smart Home for\nDenial of Service and Single Point of Failure,\u201d authored by\nB. I. Syahputra, D. Marlena, D. F. Priambodo, and Arizal,\nthe authors presented a research aimed at implementing an\nethereum-based smart home Smart Contract by modifying the\ndevice components, dashboard, and consensus used in a work\nof other authors. The consensus modification was performed\nby using Proof of Authority (PoA) aiming to improve block\nverification performance on the system. The Denial of Service\n(DoS) attacks and Single Point of Failure (SpoF) vulnerability\n\nwere performed to evaluate the proposed system. The eva-\nluation was performed with TCP Flood Attack, with request\n\npackets of 81,519 packets on port 8545 and ICMP Floods by\nsending 11,481,703 PING packets. The attack caused some\napplication services running on the Ethereum Node 3 to stop,\nbut did not stop the geth application. As for the Single Point\nof Failure (SPoF) vulnerability, the Ethereum network is still\nrunning and there were no obstacles in the mining process or\nblock verification.<\/h5>\n
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\n\nThe final paper, \u201cTesting the Advanced Single Phase Asym-\nmetric Cascaded Multilevel Inverter Topology using Renewa-\nble Energy Source,\u201d by M. C. Dey, S. Akther, P. Talukder,\n\nA. Begum, Md M. Rashid, deals with developing a model\nof single phase asymmetrical cascaded multilevel inverter\n(MLI) which couples\u2019 renewable energy sources (RES) to\n\nthe electrical or electronic loads of the AC powered trans-\nport system applications (e.g., locomotives, vehicles, etc.).\n\nThe proposed topology is asymmetric and produces 31-levels\noutput which consists of 12 IGBT switches and 4 isolated\ndc voltage supplies controlled using Pulse Width Modulation\n(PWM) technique. It has been thoroughly analyzed throughout\nthe paper to demonstrate its superiority over alternative MLI\ntopologies. The comparative analysis shows that the chosen\nexisting topology is better performed than others. According\nto the theoretical analysis conducted, the maximum efficiency\nobtained is 92.91% along with THD of 4.44% and TSV of 60\nVdc. The accuracy of the proposed topology is verified through\nsimulating the entire model in MATLAB-Simulink software.<\/h5>\n
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\nAs always, I thank the authors for their contribution to\nthis issue of the journal and send great appreciation to all\nthe reviewers who participated in the editorial process by\nproviding valuable comments in timely manner to the editors\nand authors.<\/h5>\n