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All Journal Indonesian Journal of Economics and Strategic Management Jurnal Sains dan Teknologi
Tegar Ramadhan
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Agriculture, Biological Sciences & Forestry Chemistry Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Physics Transportation

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THE INFLUENCE OF CELEBRITY ENDORSER AND PRODUCT QUALITY ON PURCHASING DECISION FOR VENTELA LOCAL SHOES (CASE STUDY OF BHAYANGKARA JAKARTA RAYA) Tegar Ramadhan; Yayan Hendayana; Murti Wijayanti
IJESM Indonesian Journal of Economics and Strategic Management Vol. 1 No. 02 (2023): July 2023
Publisher : Draf Solusi Indonesia

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The research aims to determine simultaneously and partially the independent variables namely Celebrity Endorser, product quality, and purchasing decision dependent variable. This research method is a quantitative method, which in this study uses purposive sampling calculations with Lemshow. The population in this study were Bhayangkara University students in Jakarta, with a sample of 100 respondents, where the criteria for respondents were Ubhara students and Ventela shoe consumers. Before conducting data analysis, researchers used 30 respondents as a pilot study to determine the feasibility of this study with the help of the SPSS version 24 program.
Rancang Bangun Algoritma Kalkulus untuk Mengkalkulasi Efisiensi Konversi pada Modul Daya Irvan Malay; Tegar Ramadhan; Khairul; Muhammad Rachmat; Tuahman Turnip
Jurnal Sains Dan Teknologi | E-ISSN : 3063-9980 Vol. 2 No. 3 (2026): Januari - Maret
Publisher : GLOBAL SCIENTS PUBLISHER

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This study presents a Calculus-based framework for calculating conversion efficiency in power electronics modules, with emphasis on the integration of MATLAB/Simulink for modeling and validation. The main objective is to formulate the dynamics of efficiency using differential calculus, and to optimize conduction paths and converter topology through vector calculus and variational calculus. The methodology includes mathematical modeling based on differential equations to capture conversion dynamics, transient analysis via signal processing, and optimization algorithms grounded in calculus of variations to minimize conduction losses, switching losses, and thermal losses. Validation is performed through numerical simulations in MATLAB/Simulink and experimental testing on DC-DC converter and inverter prototypes under diverse loading and temperature conditions. Initial results indicate that the calculus-based approach enhances the accuracy of efficiency estimation and provides clearer insights into the trade-offs between converter topology and operational load. The study concludes by highlighting the potential of calculus-based techniques for designing more efficient power modules and offering recommendations for topology exploration and parameter optimization under varying thermal environments. Keywords: calculus, algorithms, MATLAB, Simulink, efficiency, power module, DC-DC converter, vector calculus, transient analysis.
Co-Authors Irvan Malay Khairul Muhammad Rachmat Tuahman Turnip Wijayanti, Murti Yayan Hendayana