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All Journal Almana : Jurnal Manajemen dan Bisnis Journal of Renewable Energy and Smart Device
Meslin Silahahi
Universitas Sisingamangaraja XII Tapanuli Utara, Indonesia
Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering

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Sustainable Production Optimization under Resource and Environmental Constraints: Evidence from North Sumatra’s Industrial Sector Meslin Silahahi; Lia Saniah
Journal of Renewable Energy and Smart Device Vol. 4 No. 1 August 2026
Publisher : PT. Global Research Collaboration

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.66314/joresd.v4i1.1231

Abstract

This study develops an energy- and emission-constrained production-allocation model for North Sumatra to balance economic performance, resource availability, and environmental limits. A quantitative applied-operations-research design used January–December 2025 operational records from 150 medium- and large-scale manufacturing establishments across six subsectors. Provincial totals were estimated using an overall expansion factor of 8.667 as a uniform-factor approximation to the stratified estimator because stratum-specific population weights were unavailable. Multi-objective linear programming with AUGMECON-R compared observed, economic-only, resource-constrained, environmentally constrained, and integrated scenarios. The economic-only solution was projected to increase contribution margin by IDR 3.32 trillion (11.7%) but also increase energy use by 5.18 PJ and greenhouse gas emissions by 0.69 MtCO2e. The integrated solution increased projected contribution margin by IDR 1.65 trillion (5.8%) while reducing raw materials by 6.6%, energy by 12.2%, water by 15.2%, greenhouse gas emissions by 21.2%, solid waste by 21.5%, and wastewater by 21.6%. Production shifted most toward rubber and plastics (+12.4%) and away from non-metallic minerals/fabricated metals (−13.3%). The Pareto frontier retained 94.7% of the economic-only contribution margin at an 80% combined resource-and-environmental ceiling, declining to 90.5% at 75% and 84.0% at 70%, indicating a sharper trade-off below approximately 75–80%. The study contributes a province-level cross-subsector framework linking production allocation with demand-side energy and emissions benchmarks for industrial efficiency and renewable-energy planning.
The Effect of Live Streaming, Hedonic Shopping, and Shopping Lifestyle on Impulsive Buying Through Price Discounts Ronal Donra Sihaloho; Meslin Silahahi; Rina Handayani; Artika May Simanullang
Almana : Jurnal Manajemen dan Bisnis Vol. 9 No. 2 (2025): August
Publisher : Bandung: Prodi Manajemen FE Universitas Langlangbuana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36555/almana.v9i2.2885

Abstract

Tik-Tok Shop is a social media application that is widely liked by almost all levels of society, including young people, including regular students of Sisingamangaraja XII Tapanuli University (UNITA). Many features are available in the Tik-Tok application, including tik-tok shop, which is given the convenience of conducting product/service buying and selling transactions such as live streaming , price discounts that can hypnotize all consumers. Where initially just browsing, then continued to become impulsive buying and this will eventually become hedonic shopping and shopping lifestyle so that it has an impact on high consumption. The number of samples used in this study was 86 people, using non-probability sampling techniques and using purposive sampling methods . The data analysis method used is path analysis with SEM ( Structural Equation Modeling). The results of the study show that partially Live Streaming has no significant effect on Impulsive Buying , partially Live Streaming has a significant effect on Price Discount , partially Hedonic Shopping has a significant effect on Impulsive Buying , partially Hedonic Shopping has a significant effect on Price discount , partially Shopping Lifestyle has a significant effect on Impulsive Buying , partially Shopping Lifestyle has a significant effect on Price Discount , partially Price Discount has a significant effect on Impulsive Buying . Live Streaming has a significant indirect effect on Impulsive Buying through Price Discount as an Intervening variable , Hedonic Shopping has a significant indirect effect on Impulsive Buying through Price Discount as an Intervening variable , and Shopping Lifestyle has a significant indirect effect on Impulsive Buying through Price Discount as an Intervening variable
Co-Authors Artika May Simanullang Lia Saniah Rina Handayani Ronal Donra Sihaloho