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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) International Journal of Economics, Business and Accounting Research (IJEBAR)
Md. Ismail Hossain
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Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering

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Single stage single phase active power factor corrected Ĉuk Topology Based AC-DC Converter Md. Ismail Hossain; Mohammad Jahangir Alam
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 4, No 2: June 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper focuses on the analysis of a power factor correction (PFC) converter using close loop Ĉuk topology. Regardless of the input line voltage and output load variations, input current drawn by the buck or buck-boost converter is always discontinuous. The Boost converter suffers from high voltage stresses across the power electronic devices. The input current in Ĉuk converter is comparable to boost converter’s input current. In this paper output voltage is controlled by inner current and outer voltage control loop along with power factor correction (PFC). It shows less input current THD, nearly unity power factor and better output voltage regulation of AC-DC converter under variable input voltage and output load. In this paper the relative performance between normal diode rectifier, open loop Ĉuk rectifier and close loop Ĉuk rectifier is presented. An algorithm for implementing close loop Ĉuk rectifier in digital domain is developed and simulated.DOI: http://dx.doi.org/10.11591/ijpeds.v4i2.5574
LIVELIHOOD CHALLENGES AND COPING STRATEGIES OF AGRICULTURAL WORKERS DURING COVID-19 PANDEMIC Tanjina Afrin; Fariha Nowshin; Md. Ismail Hossain
International Journal of Economics, Business and Accounting Research (IJEBAR) Vol 6, No 2 (2022): IJEBAR, VOL. 06 ISSUE 02, JUNE 2022
Publisher : LPPM ITB AAS INDONESIA (d.h STIE AAS Surakarta)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29040/ijebar.v6i2.5123

Abstract

Bangladesh is one of the high-risk countries of the COVID-19 pandemic and its consequent losses. The main objectives of this research were to find out the livelihood challenges and coping strategies of agricultural workers during pandemic situation. This study was conducted targeting lower income group of people (temporary agricultural worker, casual agricultural workers). As the nature of the research was qualitative, the researcher used convenience sampling to select respondents because this is the most common non-probability sampling strategy where respondents were selected in an ad hoc fashion based on their accessibility. However, the researcher has taken 60 respondents as sample in analyzing data, descriptive statistics (frequency and percentage) of responses are estimated. Scores of livelihood challenges are the means of a 4-point Likert-type scale used. From this study find that most of the respondents did small business but they did not get any help or small loan from NGO. Most of the respondents drive rickshaw, auto as their off day. Due to closing of school, respondents’ children engage themselves to earning activities. Key words: Covid-19 pandemic, coping strategies, Livelihood challenges , Agricultural workers  
Co-Authors Fariha Nowshin Mohammad Jahangir Alam Tanjina Afrin