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All Journal Jurnal Optimasi Sistem Industri OPERATION EXCELLENCE: Journal of Applied Industrial Engineering Vocatech : Vocational Education and Technology Journal G-Tech : Jurnal Teknologi Terapan Sprocket : Journal of Mechanical Engineering Jurnal VORTEKS Journal of Vision and Ideas (VISA) Jurnal Al Ulum: LPPM Universitas Al Washliyah Medan Jurnal Derma Pengabdian Dosen Perguruan Tinggi (Jurnal DEPUTI) Jurnal Cakrawala Ilmiah Journal of Innovation Research and Knowledge Wahana Pariwisata
Rahmad Rezeki
Universitas Al-Azhar
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Other

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ANALISIS PENGARUH KONDISI FISIK LINGKUNGAN KERJA DAN FAKTOR PSIKOLOGI TERHADAP KINERJA KARYAWAN PT. XYZ Reini Auliya; Masdania Zuraiah; Rizka Rida; Rahmad Rezeki
Journal of Innovation Research and Knowledge Vol. 4 No. 10: Maret 2025
Publisher : Bajang Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53625/jirk.v4i10.9880

Abstract

The purpose of this study was to determine the effect of physical conditions and psychological factors partially and simultaneously on employee performance at PT. XYZ. This type of research is quantitative research with a causal research design. The population of this study were all employees of PT. XYZ. The sample of this study was 20 employees of PT. XYZ. Data collection used primary data measured directly by an independent laboratory and secondary data obtained from company documents related to this study. using multiple linear regression analysis and the data obtained will be inputted into minitab. Based on the multiple linear regression test, it can be seen that there is a negative influence between psychology and employee performance with a regression coefficient of 0.00165, meaning that if psychology increases by 1%, ployee performance decreases by 0.00165% based on the F test to see whether the independent variable has a significant relationship overall with the dependent variable, using ɑ = 5% or 0.05, testing is carried out simultaneously. the data obtained has an F value of 1.72 using ɑ = 5% obtained a p value of 0.009 while in the T test using minitab it is seen that the p value is below ɑ = 0.05 which means that we can reject. Therefore, the four parameters are statistically significant.
Optimalisasi pemanfaatan lahan kosong untuk meningkatkan ketahanan pangan santri di markaz penghafal Al-Quran Yayasan Layar Dakwah Zurairah, Masdania; Refiza; Lubis, Muhammad Fiza; Rezeki, Rahmad; Saragih, Edy
Jurnal Derma Pengabdian Dosen Perguruan Tinggi (Jurnal DEPUTI) Vol. 5 No. 1 (2025): Januari 2025
Publisher : LPPM Universitas Al-Azhar medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54123/deputi.v5i1.406

Abstract

Food security is a major challenge for Islamic boarding schools (pesantren) with limited resources and agricultural land. This study aims to optimize the use of vacant land to enhance food security at the Markaz Penghafal Al-Qur'an of Yayasan Layar Dakwah. The research methodology includes the application of agricultural techniques such as raised bed construction, selection of superior seeds, and efficient plant maintenance. The results show that utilizing vacant land with appropriate agricultural methods can increase food productivity and reduce dependence on external supplies. Tomato plants demonstrated the highest productivity at 2.25 kg/m², followed by red chili (1.75 kg/m²) and shallots (1.25 kg/m²). Additionally, the involvement of students in agricultural activities provided added benefits in terms of skill development and increased motivation. The novelty of this study lies in the integration of agricultural techniques with the pesantren education system, as well as the implementation of simple agricultural technologies that can be applied sustainably. Therefore, this research offers practical solutions to improve food security in pesantren and empower students in the field of agriculture.
Integration of forecasting and MRP models for optimization of CPO raw material inventory in the palm oil industry Sitepu, Oky Febryanta; Zurairah, Masdania; Rezeki, Rahmad; Refiza; Lubis, Muhammad Fiza
Jurnal VORTEKS Vol. 5 No. 2 (2024): October 2024
Publisher : Program Studi Teknik mesin, Fakultas Teknik, Universitas Al Azhar Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54123/vorteks.v5i2.429

Abstract

Inventory management of raw materials is a crucial aspect in ensuring the smooth production process of the palm oil industry. This study examines the effectiveness of integrating forecasting models and Material Requirement Planning (MRP) to optimize the inventory of Crude Palm Oil (CPO) raw materials at PT Salapian Indo Sawit. The palm oil industry in Indonesia represents about 3.5% of the national Gross Domestic Product (GDP) and provides employment for more than 17 million people. Inaccuracies in raw material inventory management lead to disruptions in the production process and inefficiencies in operational costs. The literature review shows that MRP methods with lot-for-lot techniques have been effectively implemented in various industries, but their application in the palm oil sector is still limited. The objective of this research is to analyze optimal forecasting methods for CPO raw material requirements and evaluate the efficiency of MRP implementation compared to conventional methods. The novelty of this research lies in the integration of forecasting methods (Moving Average and Single Exponential Smoothing) with MRP specifically for the palm oil industry, considering the unique characteristics of the palm oil supply chain. The study uses a descriptive quantitative approach with demand and historical production data from June 2020 to May 2021. The results indicate that the Single Exponential Smoothing method with ?=0.5 provides the best forecasting accuracy (MAPE=0.120; MSE=436.17). Implementing MRP with lot-for-lot techniques results in significant efficiencies, including a reduction in order frequency (26.67%), a reduction in order quantity (7.63%), and a reduction in initial inventory (8.10%). This study concludes that integrating an accurate forecasting model with the MRP system is effective for optimizing CPO raw material inventory and enhancing the operational efficiency of the company.
NILAI RISK PRIORITY NUMBER (RPN) DALAM PENGOLAHAN MINYAK KELAPA SAWIT DENGAN METODE RELIABILITY CENTERED MAINTENANCE DI PT X Masdania Zurairah; Hendra Tongam Maraden Purba; Rahmad Rezeki
Jurnal Cakrawala Ilmiah Vol. 3 No. 5: Januari 2024
Publisher : Bajang Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Research has been carried out regarding the risk priority value of Namber. Where obtained RPN 240 on the diaphragm and RPN 56 on Replenishing. So the highest damage is to the diaphragm.
Portofolio Optimal dan Pengelompokan Perusahaan Berdasarkan Pengaruh Komoditas Dunia Berry Yuliandra; Alizar Hasan; Rahmad Rezeki
Jurnal Optimasi Sistem Industri Vol. 16 No. 1 (2017): Published in May 2017
Publisher : The Industrial Engineering Department of Engineering Faculty at Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (746 KB) | DOI: 10.25077/josi.v16.n1.p50-57.2017

Abstract

The awarding of investment grade to Indonesian Stock Exchange marked an excellent development in the national capital market. This could be the key to attracting foreign investors that will further integrate the Indonesia capital market with international markets. Increasingly integrated capital market will also be more vulnerable to international issues such as the volatility of global stock indices as well as the volatility of world commodity prices (crude oil, CPO, gold etc.) as indicated by IHSG response to these issues. To minimize risk and maximize the return are the main goal of investment. Both of these two objectives can be achieved through stocks diversification and the portfolio development. Optimal portfolio requires the right stocks diversification. Therefore, investor needs to have information about which stocks are affected and unaffected by world commodity prices prior to diversifying. The goal of this research is to examine the way to form optimal portfolio from the group of companies listed in Indonesian Stock Exchange and affected by world commodity prices. Augmented Dickey Fuller (ADF) method used for stationary test of time series data and residual regression models. Regression Analysis conducted for co-integration test between commodity prices and IHSG. Error Correction Model used for correcting short-term errors. Optimal portfolio formed with Single Index Model and Treynor Index used to measure the optimal portfolio performance. Result of the study showed that gold, crude oil, platinum, rubber, corn, cotton, and Arabica coffee are the global commodities that can be used to predict the direction of IHSG movement.
Pembuatan Sabun Padat Wangi Minyak Serei Masdania Zurairah; Thea Fitri Astarani; Faisal Azhar; Rahmad Rezeki; Misdawati Misdawati
Wahana Jurnal Pengabdian kepada Masyarakat Vol. 5 No. 1 (2026): Edisi Juni
Publisher : Ilmu Bersama Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56211/wahana.v5i1.1894

Abstract

Kegiatan pengabdian masyarakat dalam pembuatan sabun wangi serai ini dilakukan di rumah Yayasan PPPA. Pelaksanaan pengabdian ini dilakukan agar anak Tahfiz mempunyai jiwa pengembangan diri dalam hal ke wirausahaan atau dapat juga untuk pengembangan dan pendekatan pada masyarakat pada saat pengabdian, pada saat setelah selesai hapalan 30 juz. Dalam pembuatan sabun wangi serai bahan yang digunakan sangat sederhana yaitu minyak serai, minyak kelapa (Virgin Coconut Oil / VCO), Natrium Hidroksida/ NaOH, pewarna dan bahan pengisi. Untuk mendapatkan sabun wangi setelah proses dilakukan dengan mencampur semua bahan maka dilakukan pencetakan. Untuk memadatkannya maka dilakukan pendinginan tetap dalam cetakan selama 24 jam. Hasil sabun yang diperoleh berupa sabun padat yang wangi serai.
ANALISIS PENGENDALIAN PERSEDIAAN BAHAN BAKU RBDPS PADA PROSES FATTY ACID DENGAN MENGGUNAKAN METODE ECONOMIC ORDER QUANTITY (EOQ) DI PT. X Romatua Pasaribu; Masdania Zurairah Siregar; Rahmad Rezeki
Jurnal Ilmiah Hospitality Vol 11 No 2: Desember
Publisher : Sekolah Tinggi Pariwisata Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47492/jih.v11i2.2386

Abstract

In this research, how to control the supply of RBDPS raw materials in the fatty acid process used the economical order Quantity (EOQ) method at PT X. The stages for producing fatty acid splitting, the glycerine pre-treatment stage, the glycerine evaporation stage, the glycerine distillation stage, the hydrogenation stage and fatty acid distillation stages. The EOQ method provides benefits to companies with savings in inventory costs. A significant influence lies in storage costs, there is a very drastic change from Rp. 127,545,434.03 to Rp. 64,419,560.90 with a difference of Rp. 63,125,873.13. From the total inventory cost, it can also be seen that the company's inventory cost is Rp. 163,856,234.03, while using the EOQ method the inventory cost is Rp. 128,839,077.79 resulting in a savings of Rp. 35,019,165.24.
Co-Authors Abdul Azis Syari Alizar Hasan Asmara Sari Nasution Berry Yuliandra Damanik, Rahmat Indrajaya Dimas Prayogi Edy Syahputra Saragih Faisal Azhar Hendra Tongam Maraden Purba Indra Gunawan Lucky Andayansyah Masdania Zuraiah Masdania Zurairah Misdawati Misdawati Misdawati, Misdawati Muhammad Fahri Azmi Muhammad Fiza Lubis Nabila Yudisha Refiza Refiza, Refiza Reini Auliya Rizka Rida Rizkha Rida Romatua Pasaribu Saragih, Edy Siregar, Masdania Zurairah Sitepu, Oky Febryanta Thea Fitri Astarani Yuliana Miranda Syafrizal Zaharuddin Zaharuddin Zurairah, Masdania