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All Journal Business Innovation and Entrepreneurship Journal
Oktri M Firdaus
Universitas Garut
Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Social Sciences Other

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Optimization of Decision-Making for Rotor Turbine Recovery in Geothermal Power Plants Using AHP, DEMATEL, and TOPSIS Methods Deden Ibnu Sahid; Nizar Alam Hamdani; Oktri M Firdaus
Jurnal Inovasi Bisnis dan Kewirausahaan Vol 8 No 2 (2026): Business Innovation and Entrepreneurship Journal (May)
Publisher : Entrepreneurship Faculty, Universitas Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35899/biej.v8i2.1201

Abstract

Geothermal Power Plants (GPPs) are a key source of renewable energy that plays a vital role in supporting national energy security. The operational reliability of GPPs is heavily influenced by the performance of steam turbines, particularly the turbine rotor, which converts thermal energy into mechanical energy. This study aims to optimize decision-making in geothermal power plant turbine rotor recovery by employing a multi-criteria decision-making approach through the integration of the Analytic Hierarchy Process (AHP), Decision Making Trial and Evaluation Laboratory (DEMATEL), and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) methods. The research findings are expected to provide recommendations for optimal turbine rotor recovery strategies that take into account technical, economic, and operational aspects, as well as support improvements in the reliability and operational efficiency of geothermal power plants in Indonesia.
The Effect Of Service Quality and Consumer Knowledge On Purchase Decisions Through Trust, With Price and Location as Moderating Variables In Pharmacies Yeni Mardiyani; Nizar Alam Hamdani; Oktri M Firdaus
Jurnal Inovasi Bisnis dan Kewirausahaan Vol 8 No 3 (2026): Business Innovation and Entrepreneurship Journal (August)
Publisher : Entrepreneurship Faculty, Universitas Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35899/biej.v8i3.1205

Abstract

The pharmaceutical retail sector in Garut faces intense competition, where purchasing decisions are heavily influenced by perceived risk and trust. This study aims to analyze the effect of service quality and consumer knowledge on purchasing decisions through trust as a mediating variable, while examining price and location as moderating variables. Using a descriptive and verificative quantitative approach, data were collected from 275 respondents via semantic differential scale questionnaires (1-7) and analyzed using Structural Equation Modeling (SEM) based on Partial Least Square (PLS) with SmartPLS 4.0. The results show that service quality and consumer knowledge significantly affect trust. Trust is the dominant variable influencing purchasing decisions with a path coefficient of 0.184. Information honesty and staff responsiveness are key factors in building consumer confidence. Moderation tests prove that price and location significantly strengthen the impact of service quality on purchasing decisions. An R-Square value of 0.824 indicates the model explains 82.4% of the purchasing decision. Descriptive findings reveal that despite high selection stability, long-term loyalty requires strategic reinforcement. In conclusion, trust is the primary determinant of purchasing decisions. Management strategies should prioritize product transparency and pharmaceutical education to transform situational purchasing behavior into sustainable loyalty by optimizing location accessibility and price rationality.
Co-Authors Deden Ibnu Sahid Hamdani, Nizar Alam Yeni Mardiyani