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25 results on '"Firmansyah, E."'

12. Sistem Pemanen Energi Dengan Tranduser Piezoelektrik Untuk Perangkat Daya Rendah

Author

Susilo, D. (Deddy), Susilo, D. (Deddy), Firmansyah, E. (Eka), Litasari, L. (Litasari), Susilo, D. (Deddy), Susilo, D. (Deddy), Firmansyah, E. (Eka), and Litasari, L. (Litasari)

Abstract

Sistem pemanen energi dengan sumber vibrasi yang diuji secara empiris terdiri dari tranduser piezoelektrik, diode penyearah dan penyimpan energi dengan super kapasitor. Studi empiris ini menghasilkan bahwa sistem penyearah yang tepat untuk mengambil energi skala ratusan miliVolt adalah diode schottky. Diode schottky mempunyai efisiensi 85% untuk sumber masukan di atas 1V. Waktu pengisian superkapasitor dengan sumber arus AC tidak terpengaruh frekuensi, tetapi dari besar amplitudonya. Efisiensi tranduser piezoelektrik paling tinggi pada frekuensi 10kHz dan 133kHz yakni 3,6% dan 22%. Resistansi keluaran tranduser menurun seiring dengan meningkatnya frekuensi. Pada pengujian perangkat mikrokontroler, sensor suhu dan RF transceiver dengan frekuensi pengiriman data 1, 5 dan 10 Hz diperoleh data bahwa pada frekuensi 1 Hz membutuhkan energi paling kecil.

Published
2014

13. A critical-conduction-mode bridgeless interleaved boost power factor correction

Author

Firmansyah, E., Tomioka, S., Abe, S., Shoyama, M., Ninomiya, Tamotsu, Firmansyah, E., Tomioka, S., Abe, S., Shoyama, M., and Ninomiya, Tamotsu

Abstract

This paper explains about fundamental working principles, governing equations, implementation problems, and experimental results of a new power factor correction (PFC) topology. In this proposed topology, bridgeless technique is applied to a critical-conduction-mode (CRM) interleaved boost PFC in order to gain fundamental understanding towards high efficiency, high performance, low-cost, simple control scheme, and low conducted electromagnetic interference (EMI) circuit. This application is targeted for low to middle power applications that normally employs continuous or interleaved boost converter., INTELEC 2009 - 2009 International Telecommunications Energy Conference : Incheon, South Korea, 2009.10.18-2009.10.22, INTELEC 2009, pp.1-5; 2009

Published
2009

14. Zero-current-switch Quasi-resonant boost converter in power factor correction applications

Author

Firmansyah, E., Tomioka, S., Abe, S., Shoyama, M., Ninomiya, Tamotsu, Firmansyah, E., Tomioka, S., Abe, S., Shoyama, M., and Ninomiya, Tamotsu

Abstract

A modified zero-current-switched quasi-resonant (ZCS-QR) boost converter is employed in a power factor correction (PFC) application. The main goal is to achieve a small-size low-noise PFC circuit based on single-switch boost topology. A clamp diode has been added to avoid the voltage ringing problem that is originally generated across the ZCS-QR switch during its turn-off period. The converter operation states after clamp diode application are presented. The PFC circuit control scheme implementation is also described. An experimental circuit with 100 V rms ac of 50 Hz input and 330 V dc output has been built. A high efficiency of 90% and the proof of compliance to the IEC61000-3-2 class D have been confirmed by experiment., 24th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2009; Washington, DC; 15 February 2009 through 19 February 2009, Applied Power Electronics Conference and Exposition, pp.1165-1169; 2009

Published
2009

25. Global prevalence and determinants associated with the acceptance of monkeypox vaccination.

Author

Indiastari D, Fajar JK, Tamara F, Runesi O, Hakim LN, Chotimah K, Rahmani A, Saputro TD, Afrilla D, Firmansyah E, Dau D, and Dzhyvak V

Subjects
Female, Humans, Male, COVID-19 prevention & control, COVID-19 epidemiology, Global Health, Prevalence, Smallpox Vaccine administration & dosage, Mpox, Monkeypox epidemiology, Mpox, Monkeypox prevention & control, Patient Acceptance of Health Care psychology, Patient Acceptance of Health Care statistics & numerical data, Vaccination psychology, Vaccination statistics & numerical data
Abstract

Assessing the acceptance of the monkeypox vaccine is crucial for the success of vaccination programs, yet the prevalence reports remain inconclusive. The aim of this study was to determine the global prevalence of monkeypox vaccine acceptance and identify its associated factors. A meta-analysis was conducted with a comprehensive search strategy on the following databases, including Scopus, Embase, and PubMed, for articles published up to April 5, 2024. This study utilizes a single-arm meta-analysis to calculate the pooled prevalence of monkeypox vaccine acceptance. A Z -test was employed to identify factors associated with the vaccine acceptance. Our study analyzed 51 articles encompassing 98,746 participants, revealing an overall monkeypox vaccine acceptance rate of 65%. Notably, the highest acceptance rates were observed among men who have sex with men (MSMs), while healthcare workers (HCWs) showed the lowest acceptance rates. Additionally, our findings indicated an increased acceptance in individuals with educational attainment beyond a bachelor's degree, a history of COVID-19 and influenza vaccination, homosexual orientation, and HIV-positive status. Conversely, lower acceptance risk was associated with those with educational attainment below a bachelor's degree, heterosexual orientation, and bisexual orientation. In conclusion, our current study has determined the rate of monkeypox vaccine acceptance and identified its associated factors. These findings offer valuable insights as the foundation for targeted policies to manage and increase acceptance rates., Competing Interests: All the authors declare that there are no conflicts of interest., (© 2024 The Author(s).)

Published
2024
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