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All Journal JURNAL MATEMATIKA STATISTIKA DAN KOMPUTASI Kubik Zero : Jurnal Sains, Matematika, dan Terapan Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika Jatilima : Jurnal Multimedia Dan Teknologi Informasi Mandalika Mathematics and Educations Journal INFOKUM Journal of Computer Networks, Architecture and High Performance Computing KUBIK: Jurnal Publikasi Ilmiah Matematika Journal of Mathematics and Scientific Computing With Applications NUSANTARA: Jurnal Pengabdian Kepada Masyarakat Jurnal Pengabdian Masyarakat Bilangan: Jurnal Ilmiah Matematika, Kebumian dan Angkasa Algoritma: Jurnal Matematika, Ilmu Pengetahuan Alam, Kebumian dan Angkasa
Rina Filia Sari
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Religion Agriculture, Biological Sciences & Forestry Astronomy Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Library & Information Science Mathematics Physics Social Sciences Other

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Analysis of the Effectiveness of the T² Hotelling Control Chart in Concrete Control Syilviani; Rina Filia Sari
Journal of Computer Networks, Architecture and High Performance Computing Vol. 7 No. 3 (2025): Articles Research July 2025
Publisher : Information Technology and Science (ITScience)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47709/cnahpc.v7i3.6848

Abstract

In the world of construction, concrete quality plays a very important role because it directly affects the strength and durability of building structures. The purpose of this research is to appraise and evaluate the efficiency of using the T² Hotelling control chart method in controlling concrete quality at PT. Wijaya Karya Beton Tbk by analyzing three main concrete quality parameters: slump, compressive strength, and tensile strength, based on data collected from January to February 2025. The methods employed include multivariate analysis approaches, such as correlation tests, multivariate normality tests, Johnson transformation to improve non-normally distributed data, and the application of generalized variance control charts and T² Hotelling control charts. The results of the study indicate a significant correlation between concrete quality variables; however, the initial data did not meet the assumption of multivariate normality, necessitating the Johnson transformation, which proved effective in improving data distribution and enabling the application of Hotelling's T² analysis. Based on the control charts, most observations remained inside the established control limits; however, some samples fell outside the boundaries, indicating process disturbances. Overall, this study concluded that the Hotelling T² method is effective in detecting process nonconformities at an early stage, thereby serving as a foundation for continuous improvement in concrete production quality and making a significant contribution to strengthening the quality control system in the national construction sector.
Optimization Of Rice Production In Asahan District Using The Goal Programming Method Noerdiansyah; Rina Filia Sari
Jurnal Multimedia dan Teknologi Informasi (Jatilima) Vol. 7 No. 03 (2025): Jatilima : Jurnal Multimedia Dan Teknologi Informasi
Publisher : Cattleya Darmaya Fortuna

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54209/jatilima.v7i03.1657

Abstract

This research aims to optimize rice production in Asahan Regency using the Goal Programming method. The secondary data analyzed included rice production, land area, labor costs, harvesting costs, and selling prices for the period 2021–2023. The Goal Programming model is designed to minimize production costs by considering the proportion of labor costs (70.66%) and harvesting costs (34% of labor costs). The research results show fluctuations in production, with the highest achievement in 2022 at 89,459.42 tons, revenue of Rp 552.86 billion, and profit of Rp 162.21 billion. The application of the model is able to reduce labor and harvest costs, thereby increasing efficiency. Sensitivity analysis shows selling price as the most influential variable on profit, followed by labor costs and harvesting costs; a price decrease of more than 5% could potentially lower revenue below the threshold. This finding confirms the importance of cost control strategies and price stability in maintaining profitability. This research provides practical contributions to local governments and farmers in formulating food security policies and opens up opportunities for developing multi-commodity models in future research.
Implementasi Program Linear pada Efisiensi Penugasan Jam Kerja Divisi Pengadaan PT. Pelindo Multi Terminal Dengan Metode Hungarian Rahma Aulia; Sabrina Nasution; Rina Filia Sari; Muliawaty, Muliawaty
Bilangan : Jurnal Ilmiah Matematika, Kebumian dan Angkasa Vol. 3 No. 4 (2025): Agustus : Bilangan : Jurnal Ilmiah Matematika, Kebumian dan Angkasa
Publisher : Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62383/bilangan.v3i4.749

Abstract

This research was conducted with the aim of optimizing the assignment of working hours in the Procurement Division of PT. Pelindo Multi Terminal through the application of the Hungarian method. The fundamental problem faced is the imbalance between the number of permanent workers and the high workload that must be completed, thus creating a risk of inefficiency in the operational process. To address this problem, a quantitative approach was used with linear programming modeling techniques designed to produce a more systematic and measurable assignment allocation. Through the analysis conducted, an optimal solution was obtained regarding the distribution of working hours, where the total working time can be reduced to 10,120 minutes per month, lower than the previously set maximum limit of 10,560 minutes per month. These results indicate that the application of the Hungarian method is not only able to reduce excessive workloads on some employees, but also ensures a more proportional distribution of assignments among all available workers. In addition, this method can increase operational effectiveness because each worker receives a load according to their capacity, so that the risk of fatigue or decreased performance can be minimized. The findings of this study confirm that the Hungarian method is an alternative work scheduling strategy that is efficient to be applied in industrial environments with high task complexity. Proper implementation can also support the achievement of overall company productivity, improve the quality of human resource management, and strengthen the company's competitiveness in facing future operational challenges.
Optimization of Potato and Carrot Production in Karo District Using the Beale Method riezky, riezkyfadhillah; Rina Filia Sari
KUBIK Vol 10 No 1 (2025): IN PRESS
Publisher : Jurusan Matematika, Fakultas Sains dan Teknologi, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/kubik.v10i1.49213

Abstract

This study aims to optimize land allocation for potato and carrot production in Karo Regency, North Sumatra, using a quadratic programming approach using the Beale method. Secondary data from the Karo Regency Agriculture Office for 2018-2024 are used to construct a quadratic objective function using the least squares method. The Beale method is applied iteratively to solve optimization problems with linear constraints. The results show that the optimal land allocation of 0.5382 hectares for carrots and 0.4005 hectares for potatoes provides a maximum yield of 1.6239 tons. These findings demonstrate the effectiveness of the mathematical optimization approach in improving land use efficiency and supporting data driven decision making in the horticultural agricultural sector.
Optimization of Potato and Carrot Production in Karo District Using the Beale Method riezky, riezkyfadhillah; Rina Filia Sari
KUBIK Vol 10 No 1 (2025): KUBIK: Jurnal Publikasi Ilmiah Matematika
Publisher : Department of Mathematics, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/kubik.v10i1.49213

Abstract

This study aims to optimize land allocation for potato and carrot production in Karo Regency, North Sumatra, using a quadratic programming approach using the Beale method. Secondary data from the Karo Regency Agriculture Office for 2018-2024 are used to construct a quadratic objective function using the least squares method. The Beale method is applied iteratively to solve optimization problems with linear constraints. The results show that the optimal land allocation of 0.5382 hectares for carrots and 0.4005 hectares for potatoes provides a maximum yield of 1.6239 tons. These findings demonstrate the effectiveness of the mathematical optimization approach in improving land use efficiency and supporting data driven decision making in the horticultural agricultural sector.
Seminar Edukasi Untuk Meningkatkan Kesadaran Masyarakat terhadap Dampak Pernikahan Dini di Desa Naga Kesiangan Andika Saputra; M. Wahyu; Widya Amelita Dewi Asri Harahap; Khairan Nur Panggabean; Nadya Kartika; Anggun Salsabila Samosir; Rina Filia Sari
Nusantara: Jurnal Pengabdian kepada Masyarakat Vol. 5 No. 4 (2025): November: NUSANTARA Jurnal Pengabdian Kepada Masyarakat
Publisher : Pusat Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/nusantara.v5i4.6757

Abstract

The purpose of this education is to increase public awareness, especially among teenagers, of the impacts of early marriage through educational seminars and Service-Learning-based outreach in Naga Kesiangan Village. Early marriage remains a critical issue in Indonesia, often associated with health risks, psychological stress, and limited educational and social opportunities for young people. The Service-Learning approach was chosen because it not only provides knowledge transfer but also actively engages participants in reflection and discussion, ensuring that the learning process is more contextual and sustainable. The method used was Service-Learning, involving 30 teenagers aged 15–19 years, 15 parents, and 5 community leaders who were purposively selected for their direct relevance to the issue. Activities included seminars, small group discussions, interactive question-and-answer sessions, and collective reflection. The results of the activity showed a significant increase in participants’ understanding, from 42% (pre-test) to 81% (post-test). Participants gained a deeper understanding of the health, psychological, social, and educational risks of early marriage and were encouraged to delay marriage by choosing positive alternatives through education and skill development. This program also strengthened the role of families and community leaders as preventive agents by fostering collective awareness and support. Thus, educational seminars integrated with Service-Learning prove to be effective and replicable strategies to prevent early marriage practices, while also empowering communities to build healthier, more resilient generations.
SERVICE QUALITY ANALYSIS OF CAMPUS-BASED MOTORCYCLE TAXI (GOPUS): AN INTEGRATED SERVQUAL–IPA–PGCV APPROACH Dinda Renata Cecilia; Rina Filia Sari; Rini Halila Nasution
Journal of Mathematics and Scientific Computing With Applications Vol. 6 No. 2 (2025)
Publisher : Pena Cendekia Insani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53806/jmscowa.v6i2.1423

Abstract

This study evaluates the service quality of GOPUS, an informal,WhatsApp-based campus ride-hailing service at UINSU, Indonesia. Using a quantitative approach, data were collected from 100 student respondents via Likert-scale questionnaires assessing expectations andperceptions across five SERVQUAL dimensions. After validity and reliability screening, 16 items remained for analysis. The SERVQUALgap analysis, Importance-Performance Analysis (IPA), and PotentialGain in Customer Value (PGCV) index were applied to identify improvement priorities. Results reveal a negative service gap across keyattributes, with five indicators falling into IPA Quadrant I (ConcentrateHere). PGCV prioritizes driver service satisfaction (P GCV = 5.95) andtraining (P GCV = 3.75) for immediate intervention. The findings provide actionable recommendations for enhancing operational standards,safety, and user satisfaction in informal campus transport systems.
Co-Authors Andika Saputra Anggun Salsabila Samosir Dinda Renata Cecilia Elis Citra Purnama Purba Fani Indriyani Ningsih Hanifa Mardiatun Nasution Harry Feroza Hendra Cipta Ika Silvia Ramadani Ismail Husein, Ismail Khairan Nur Panggabean M. Wahyu Melinda Aprianingsih Muhammad Chairul Imam Muliawaty, Muliawaty Nadya Kartika Noerdiansyah Nur Manda Sari Nurmalinda Utami Siregar Rahma Aulia Ramya Rachmawati riezky, riezkyfadhillah Rima Aprilia Rina Widyasari Rini Halila Nasution Sabrina Nasution Shopia Siti Aisyah Syilviani Syuhada Syuhada Taslima Dewi Tia Mutiara Tri Kartika Chaniago Widya Amelita Dewi Asri Harahap