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All Journal Jurnal Teknik Industri J@TI (TEKNIK INDUSTRI) Jurnal Perikanan dan Kelautan Jurnal Ilmu Perairan (Aquatic Science) Jurnal Sain Peternakan Indonesia Jurnal Ilmiah Teknik Industri JFMR (Journal of Fisheries and Marine Research) Jurnal Ilmiah Universitas Batanghari Jambi EKONOMIS : Journal of Economics and Business Jurnal Riset Kefarmasian Indonesia Teknika Sains : Jurnal Ilmu Teknik Journal of Rural and Urban Community Empowerment Baselang: Jurnal Ilmu Pertanian, Peternakan, Perikanan dan Lingkungan Al Irsyad: Jurnal Studi Islam Makara Journal of Technology Review of Accounting and Business Journal of Fish Health Jurnal Perikanan dan Kelautan Jurnal Perikanan Asian Journal of Science Education Mantis Journal of Fisheries Ar-Rasyid: Jurnal Publikasi Penelitian Ilmiah Jurnal Nispatti
Farizal Farizal
Departement of Industrial Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia
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Journal : Makara Journal of Technology

 1 
Multi-Project Scheduling Cost Optimization in a Machine Manufacturer Engineer-to-Order Farizal, Farizal; Rachman, Amar; Tandean, Tifani; Sudarto, Sumarsono; Takahashi, Katsuhiko
Makara Journal of Technology Vol. 20, No. 1
Publisher : UI Scholars Hub

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This paper discusses the utilization of mixed integer linear programming (MILP) model to optimize cost for multiproject scheduling in a machine maker company. The objective is to minimize total project’s penalty cost and labor cost. The model formulated shows how to achieve the objective i.e. whether to use outsourcing or overtime to finish all projects. The model of multi-project scheduling was solved by Branch & Bound algorithm coded in Lingo 14.0 software. The case study shows that if a company wants to minimize lateness, it should use overtime instead of outsourcing, which minimize total lateness of projects by 144 days or 73.5%. Whereas, if a company wants to optimize cost, they should use outsourcing instead of overtime, which reduces total cost of about 10,873,000 IDR or 28.5%. These results indicate that the model developed is applicable for optimizing multi-project scheduling.
Optimization of Electricity Generation Schemes in the Java-Bali Grid System with Co2 Reduction Consideration Farizal, Farizal; Septia, Wenty Eka; Rachman, Amar; Nasruddin, Nasruddin; Mahlia, Teuku Meurah Indra
Makara Journal of Technology Vol. 20, No. 2
Publisher : UI Scholars Hub

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This research considers the problem of reducing CO2 emissions from the Java-Bali power grid system that consists of a variety of power-generating plants: coal-fired, natural gas, oil, and renewable energy (PV, geothermal, hydroelectric, wind, and landfill gas). The problem is formulated as linear programming and solved using LINGO 10. The model was developed for a nation to meet a specified CO2 emission target. Two carbon dioxide mitigation options are considered in this study, i.e. fuel balancing and fuel switching. In order to reduce the CO2 emissions by 26% in 2021, State Electric Supply Company (PLN) has to generate up to 30% of electricity from renewable energy (RE), and the cost of electricity (COE) is expected to increase to 617.77 IDR per kWh for a fuel balancing option, while for fuel switching option, PLN has to generate 29% of electricity from RE, and the COE is expected to increase to 535.85 IDR per kWh.
Indonesia’s Municipal Solid Waste 3R and Waste to Energy Programs Farizal, Farizal; Aji, Radityo; Rachman, Amar; Nasruddin, Nasruddin; Indra Mahlia, Teuku Meurah
Makara Journal of Technology Vol. 21, No. 3
Publisher : UI Scholars Hub

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Abstract

Like most cities in the world, population in Indonesia continues to grow every year. Problems that can arise from this are the increasing amount of municipal solid waste (MSW) production and the growing demand for electricity. To deal with the problems, Indonesian government runs 3R (Reduce, Reuse and Recycle) and WTE (Waste to Energy) Programs simultaneously. 3R program aims to reduce the number of waste, while WTE program aims to generate electricity as an alternative energy source. This study aims to find out the optimal proportion of MSW treated through the 3R and WTE programs. For the purpose, a goal programming model has been developed and solved using LINGO 11. The results showed that the optimal proportion of MSW through the 3R program is 49.90%, 12.37% through WTE program. This leaves 37.73% of waste untreated. The electricity generated from WTE program reached 1,229.695 GWh, total emissions that can be saved is 1,809,208.2 tons CO2 equivalent and total land-use for the programs is 4,036,239.1 m2. This study was enriched by performing some scenarios, i.e. adding budget allocation of WTE program, tightening the limit of total emission from waste management and reducing the limit of land-use for waste treatment.
Co-Authors Afriani H Afzalani Afzalani Aji, Radityo Amar Rachman Ananda, Fira Dwi ARDIANSYAH ARDIANSYAH Ardiyansyah, Rizky Wiwid Arya Arfiana, BS Monica Bagus Pramusintho Bani, Moh. Yusuf Citra Noeraini Edwin Stiadi, Edwin Elymaizar, Zulfa Erbid Dwi Pradana Ester Restiana Endang Gelis Fachroerrozi Hoesni, Fachroerrozi Fachry Abda El Rahman Farhan Ramdhani Fauzan Ramadan Firmansyah Firmansyah Hadi Al Rasyid, Hadi Al Hariski, M Haryani, Nova Heltria, Septi Hidayatullah, Lutfie Hoesni, Fachroerozi Indra Mahlia, Teuku Meurah Indra Sulaksana Katsuhiko Takahashi, Katsuhiko Lisna Lisna, Lisna Lisna, Lisna Mahlia, Teuku Meurah Indra Mairizal Mairizal Maulida, Syafira Mega Yulia Muhammad Abdul Halim Muhammad Rizki Munawarah, Ratu Aisyah muztaba, muztaba Nanang Surya Putra, Nanang Surya Nasruddin Nasruddin Nelwida Nelwida Nita Nita Noferdiman Noferdiman Novandra Rhezza Pratama Nurhayati Nurhayati Pradana, Erbid Dwi R. A. Muthalib R. Adisetiawan, R. Raguati Raguati Rahmat Nurcahyo Ramadhan, Fauzan Rani Anggraini, Rani Riezqulloh, Anas Rizky Janatul Magwa Saparudin Saparudin Sastradiharja, EE Junaedi Septia, Wenty Eka Suhessy Syarif, Suhessy Sumarsono Sudarto, Sumarsono Syamsul Bahri Tamaulina Br Sembiring Tifani Tandean, Tifani Tinambunan, Maryo Toni, Toni Wahyudi, Retno Wijaya, Jogi Yun Alwi Yusniati, Wontri