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All Journal Jurnal Ilmiah Riset dan Pengembangan Journal of Renewable Energy and Smart Device
Lia Saniah
Universitas Muhammadiyah Sukabumi
Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Social Sciences Other

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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 THE IMPLEMENTATION OF EDUCATION POLICY AND SCHOOL MANAGEMENT ON THE QUALITY OF EDUCATION SERVICES IN CIANJUR REGENCY Lia Saniah; M. Reevany Bustami
Irpia : Jurnal Ilmiah Riset dan Pengembangan Vol 11 No 3 (2026): IRPIA: Jurnal Ilmiah Riset dan Pengembangan
Publisher : Institut Riset dan Pengembangan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71040/jirp.v11i3.340

Abstract

The quality of regional education services is determined by the ability of policies to be translated into consistent actions and the ability of schools to manage resources to meet the needs of students. This study aims to analyze the influence of the implementation of education policies and school management on the quality of educational services in Cianjur Regency and formulate a mechanism for improvement. The research uses an explanatory qualitative approach through an integrative literature review and document analysis of regulations, official statistics, regional policies, and scientific literature. Data is analyzed using thematic coding, source triangulation, and cause-and-effect chain mapping. The results show that clarity of goals, communication, resources, coordination, discretion, and monitoring determine the quality of implementation. At the school level, leadership, data-driven planning, teacher management, learning, financing, facilities, student services, partnerships, and quality assurance translate policies into services. The influence of the two variables is complementary and mediated by the capacity of the implementer, the suitability of the policy with the context, and the continuity of support. Geographical conditions, access gaps, the need for disaster-safe education, and the restoration of facilities are important contexts in Cianjur. In conclusion, the quality improves when the local government connects policy design, implementation support, responsible school autonomy, and evaluation based on access, learning process, security, inclusivity, outcomes, and user experience.
Co-Authors M. Reevany Bustami Meslin Silahahi