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All Journal Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika Journal of Social Sciences and Technology for Community Service
Harianto Harianto
Universitas Muhammadiyah Bulukumba
Humanities Computer Science & IT Engineering Languange, Linguistic, Communication & Media Library & Information Science Mathematics

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Penerapan Strategi Diversifikasi dalam Pembentukan Portofolio Optimal Menggunakan Model Markowitz Suriani M; Dian Firmayasari S; Harianto Harianto; Nur Sipa; Serli Alifia; Dirman Dirman
Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika Vol. 9 No. 2 (2026): Exploring Mathematics through Education, Modeling, Finance, and Cultural Perspe
Publisher : Universitas Cokroaminoto Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30605/proximal.v9i2.8800

Abstract

Investments made by investors are generally influenced by the level of return and risk. Therefore, to address this risk, investors can conduct an analysis in advance by diversifying their portfolios. The purpose of this study is to form an optimal portfolio using the Markowitz model so that it can be used as a basis for investment considerations. The data used in this study is secondary data, namely monthly stock data from four companies listed on the Indonesia Stock Exchange (IDX) for the period January 2025 - January 2026 and whose shares are listed on the Liquid 45 (LQ45) index, obtained from the official Yahoo Finance website. The results of the study show that there are three portfolios that fall into the category of optimal portfolios based on the Markowitz efficient portfolio concept, namely portfolio 1 (a combination of PT Bank Syariah Indonesia Tbk and PT Bank Negara Indonesia (Persero) Tbk stocks), with the highest expected return of 10.47% and a risk of 8.12%. Portfolio 3 (a combination of PT Bank Syariah Indonesia Tbk and PT Bank Central Asia Tbk stocks), which offers a balance between return and risk with the same value of 7.45%. Portfolio 5 (a combination of PT Bank Tabungan Negara (Persero) Tbk and PT Bank Central Asia Tbk shares), with the lowest risk level of 5.92% and an expected return of 5.69%.
Smart Solar Incubator for Strengthening Village Poultry Production and Food Independence Ilmar Andi Achmad; Nurwahidah J.; Harianto Harianto; A. Hasdiansyah; Ahmad Asyura; Cakra Wahyu Ramadhan; Emirati Emirati
Journal Social Sciences And Technology For Community Service Vol. 7 No. 2 (2026): Volume 7 Nomor 2 September 2026
Publisher : Universitas Teknokrat Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33365/jsstcs.v7i2.2798

Abstract

This community service program addressed low productivity in native-chicken seed production at Pemuda Libureng Farm, Mattirowalie Village, Libureng District, Bone Regency. Prior to the intervention, the partner utilized a conventional wooden incubator with a capacity of 50 eggs, manual egg turning, unstable lamp-based heating, and complete reliance on grid electricity. Consequently, hatchability was limited to 30–40%. The program implemented a Smart Solar Incubator that integrated solar photovoltaic power, battery storage, grid backup, automatic temperature control, and an automatic egg-turning mechanism. The technology transfer was complemented by training in hatching management, biosecurity, basic cash-flow recording, cost-of-production calculation, standardized chick-box packaging, and digital marketing. The core field implementation was completed in June 2026. Program documentation indicated hatchability exceeding 85% and operational energy efficiency reaching up to 70%. Furthermore, egg turning transitioned from three manual turns per day to automatic operation every three hours. The partner also adopted basic business bookkeeping and digital marketing through Facebook Marketplace and WhatsApp Business. Revenue growth exceeding the baseline is considered a program projection, as longitudinal post-program financial records were not available in the provided evidence. The intervention demonstrates the effectiveness of integrating appropriate renewable-energy technology and community education in jointly enhancing rural poultry production and local food resilience.
Co-Authors A. Hasdiansyah Ahmad Asyura Cakra Wahyu Ramadhan Dhian Eka Wijaya Dian Firmayasari Dian Firmayasari S Dirman Dirman Emirati, Emirati Ilmar Andi Achmad Muhammad Isbar Pratama Nur Ahniyanti Rasyid Nur Sipa Nurwahidah J. Serli Alifia Suriani M