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All Journal IJBE (Integrated Journal of Business and Economics) Jurnal Akuntansi dan Manajemen Dinasti International Journal of Economics, Finance & Accounting (DIJEFA) Jurnal Ilmiah Ekonomi dan Manajemen Jurnal Akademi Akuntansi Indonesia Padang Jurnal Polimesin Jurnal Komunikasi dan Ilmu Sosial Fibonacci : Jurnal Ilmu Ekonomi, Manajemen dan Keuangan
Sinaga, Jhonni
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Humanities Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Enhancing production effectiveness of the K-58 crankcase machining line through integrated TPM–FMEA approach Sinaga, Zulkani; Sinaga, Jhonni
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.8231

Abstract

On the Crankcase K-58 machining line, several performance gaps were identified, including inconsistent cycle time, frequent unplanned downtime, and tool-change irregularities that caused the output to fall below the company targets. This study aims to enhance the production effectiveness of the K-58 crankcase machining line by applying an integrated Total Productive Maintenance (TPM) and Failure Mode and Effects Analysis (FMEA) approach. The initial performance evaluation, using Overall Equipment Effectiveness (OEE) in 2024, showed an average score of 76.2%, indicating significant losses in availability and performance rates. Quantitative analysis was conducted through OEE and Six Big Losses assessments, while FMEA was used to prioritize failure points based on Risk Priority Number (RPN). Improvement actions implemented included autonomous maintenance reinforcement, scheduled preventive maintenance, operator skill development, coolant-condition control, and quick-change adjustments. After implementation, OEE of the machining line increased to 85.5%, meeting the its target. Reduced speed losses improved by more than 45%, while setup and adjustment losses decreased by over 50%. These results confirm that the integrated TPM–FMEA approach is effective for enhancing machining-line performance and reliability.
Analisis Pembentukan Portofolio Optimal Saham-Saham Big Bank di LQ-45 Menggunakan Model Elton dan Gruber di Bursa Efek Indonesia Periode 2019-2023 Monika Sari Siagian, Friska; Richo Rianto, Muhammad; Sinaga, Jhonni; Haymans Manurung, Adler
Fibonacci: Jurnal Ilmu Ekonomi, Manajemen dan Keuangan Vol. 1 No. 3 (2025): Fibonacci: Jurnal Ilmu Ekonomi, Manajemen, dan Keuangan
Publisher : Yayasan Inovasi Akademi Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63217/fibonacci.v1i3.117

Abstract

Analysis of Optimal Portfolio Formation of Big Bank Stocks in LQ-45 Using the Elton and Gruber Model on the Indonesia Stock Exchange for the 2019-2023 Period. This study aims to analyze the management of stock portfolios on the Indonesia Stock Exchange using the Elton and Gruber Model, focusing on Big Bank stocks included in the LQ-45 stock index during the 2019-2023 period. This study uses monthly data for the 2019-2023 period, with data analysis techniques using Microsoft Excel. The results of this study found that there were 3 stocks included in the optimal portfolio with an Excess Return to Beta (ERB) value greater than the Cut-Off Rate (CI), namely; Bank Central Asia Tbk (BBCA), Bank Rakyat Indonesia Persero (BBRI) and Bank Mandiri (Persero) Tbk (BMRI). The results show that the optimal portfolio is formed by stocks that have high returns at relatively the same risk level.
Co-Authors Achmad Fauzi Adler Haymans Manurung Alfonso Lande Andra Nabila, Raudita Aulya, Rafi Alif Dita Puspitasari Fikri , Adi Wibowo Noor Heru Tian Sanjaya Idel Eprianto Ilham Faturrahman, Muhammad John E.H.J., FoEh M. Ilham Faturrahman M. Rafli Hermawan Maidani, Maidani Mangalindung, Giovani Huiser Monika Sari Siagian, Friska Nisrina, Ghina Panubut Simorangkir Rianto, Muhammad Richo Rosalinda Manullang, Mitha Debora Sinaga, Zulkani Supriyanto Supriyanto Supriyanto Supriyanto