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All Journal AdMathEdu : Jurnal Ilmiah Pendidikan Matematika, Ilmu Matematika dan Matematika Terapan Jurnal Sains Matematika dan Statistika BAREKENG: Jurnal Ilmu Matematika dan Terapan Eksakta : Berkala Ilmiah Bidang MIPA Pelita Eksakta Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika KUBIK: Jurnal Publikasi Ilmiah Matematika MATHunesa: Jurnal Ilmiah Matematika Journal of Mathematics UNP Rangkiang Mathematics Journal
Rara Sandhy Winanda
Department Of Mathematics, Faculty Of Mathematics And Natural Science, Universitas Negeri Padang, Padang, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Transportation Other

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Penerapan Metode Goal Programming Non-Preemptive dalam Mengoptimalkan Produksi Air Bersih PDAM Kota Padang Panjang Safitri, Reza Dwi; Winanda, Rara Sandhy
Journal of Mathematics UNP Vol 9, No 1 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i1.15657

Abstract

The Regional Water Supply Company of Padang Panjang is a water supply company located in the city of Padang Panjang. This company has production constraints on the amount of water that does not meet the demand for clean water by customers and the operational costs of maintaining water sources are higher during the dry season than the selling price of water to customers, which causes the company to suffer losses. The purpose of this study is to optimize the production of clean water and minimize losses at the Regional Water Supply Company of Padang Panjang. The method used in this study is Non-Preemptive Goal Programming. The results of this study found a decrease in losses at the Regional Water Supply Company of Padang Panjang, which previously amounted to IDR 174,566,828 to no longer experience losses.
Pemodelan Stunting pada Balita di Indonesia Menggunakan Geographically Weighted Regression (GWR) Sari, Rida Purnama; Winanda, Rara Sandhy
Journal of Mathematics UNP Vol 8, No 3 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i3.15057

Abstract

Stunting affects children's growth, with the number of cases of stunting under five in Indonesia amounting to 21.6 percent in 2022. Each province in Indonesia has different stunting rates. So a solution is needed to find out the right factors as a form of prevention of cases of stunting toddlers. This study uses geographically weighted regression in modeling the stunting rate, with variables that are assumed to influence it. Based on the spatial heterogeneity test, the stunting rate among toddlers varies in each region. Furthermore, several regional groups were formed based on significant variables. The first group is provinces that do not have explanatory variables that affect stunting rates in children under five. Meanwhile, the second group showed Low Birth Weight (LBW) as an influencing variable and the third group consisted of exclusive breastfeeding and Low Birth Weight (LBW) as a variable affecting stunting rates in toddlers.
Model Matematika Penyakit Busuk Buah Kakao dengan Pengaruh Pengendalian Fungisida Nabati Lengkuas Pangaribuan, Yohanes Mangasitua; winanda, rara sandhy
Journal of Mathematics UNP Vol 9, No 2 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i2.15705

Abstract

The cocoa fruit rot disease can be caused by the fungus Phytophthora palmivora. One way to prevent this disease is by using the galangal-based botanical fungicide. This research aims to understand the dynamics of cocoa fruit rot disease spread in a cocoa plant population with the influence of galangal-based botanical fungicide application. In the obtained model, equilibrium points are determined, and local stability analysis is conducted around these equilibrium points. The study also identifies critical points, represented by parameters that play a crucial role in stability changes within the given system. Analytical results are supported by numerical simulations, using parameter values obtained from relevant journals. Based on the analysis, there are two equilibrium points: the disease-free equilibrium point and the endemic equilibrium point. The disease spread analysis is influenced by the parameter value . If , the cocoa population remains free from disease spread, and conversely, if , the disease will spread in the population.
Optimasi Pendistribusian Beras Bansos Menggunakan Metode Improved Zero Point di Perum Bulog Kantor Cabang Padang Sidempuan BATUBARA, RISKA AMALIA; Winanda, Rara Sandhy
Journal of Mathematics UNP Vol 9, No 1 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i1.15448

Abstract

Social Assistance Rice is a type of Government Rice Reserve rice which is provided free of charge to Beneficiary Families. Perum Bulog Padang Sidempuan Branch Office is tasked with providing and distributing Social Assistance Rice to destination Regency orCity. In distributing social assistance rice to destination areas, it costsquite a lot, namely Rp. 178.843.350. This includes transportation problems that can be solved using transportation methods. The application of the transportation method means obtaining an allocation of distribution of goods that can minimize total transportation costs. One method of transportation is the Improved Zero Point method which is a direct method without looking for an initial solution first and this method is good and efficient to use to get the optimal solution. From calculations using the Improved Zero Point method, the costs incurred are Rp. 177.971.180. So implementing this method can save distribution costs of Rp. 872.170.
Analisis Kestabilan Model Matematika Dinamika Penyebaran Rumor melalui Media Sosial dan Verbal Fauziah, Helena; Winanda, Rara Sandhy
Journal of Mathematics UNP Vol 9, No 2 (2024): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v9i2.15703

Abstract

Rumor, unverified information, propagate swiftly through word of mouth and social media. This research will discuss a mathematical model of the dynamics of rumor spreading through social media and verbal with four compartments, namely I, M, G and R. This is referred to a basic research (theoretical) using descriptive method. The results of this research indicate that the rumor-free equilibrium point is asymptotically stable if it satisfies the conditions, meaning that no rumor spreads in the population; the rumor-endemic equilibrium point through verbal is asymptotically stable if it satisfies the conditions, meaning that rumors spread but only through verbal in the population; and the rumor-endemic equilibrium point through media is asymptotically stable if it satisfies the conditions, meaning that rumors spread but only through media in the population.
Optimasi Perencanaan Produksi Usaha Keripik Sanjai Rina Menggunakan Pendekatan De Novo Programming Oktavia, Bella; Winanda, Rara Sandhy
Journal of Mathematics UNP Vol 8, No 3 (2023): Journal Of Mathematics UNP
Publisher : UNIVERSITAS NEGERI PADANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/unpjomath.v8i3.14976

Abstract

One important part of industry is production planning. Production planning is a strategy to determine how many products to produce and how many resources are needed to make these products. By using the De Novo Programming approach, this research aims to determine the right production planning in the Business of Keripik Sanjai Rina so that the maximum profit is obtained. The De Novo Programming approach can determine the best combination of output and proposed use of resources based on the available budget. This approach can be solved using the simplex method. The results showed that the optimal number of products and the amount of raw material purchases were obtained so that the profit obtained by the Business of Keripik Sanjai Rina increased by 35%.
Application of the Additive Ratio Assessment (ARAS) Method in Selecting Superior Tourism in the Pasaman District Region Afrianti, Yusita; Rara Sandhy Winanda
Rangkiang Mathematics Journal Vol. 3 No. 1 (2024): Rangkiang Mathematics Journal
Publisher : Department of Mathematics, Universitas Negeri Padang (UNP)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/rmj.v3i1.52

Abstract

Pasaman Regency has tourism potential, which has not been managed optimally as a whole. Relevant institutions can make improvements to each tourist attraction so that the tourist attractions have the same advantages, so that visitors' interest and interest in visiting each tourist attraction is equal in the future, and regional original income (PAD) will increase from the tourism sector. This research aims to apply the Additive Ratio Assessment (ARAS) Method to select superior tourism in the Pasaman Regency area. The ARAS method will rank tourist attractions in Pasaman Regency based on predetermined criteria. Based on the results of research using the ARAS method, it was found that the most superior tourism attraction was the Ambun Waterpark tourist attraction (A5) with the highest Ki value, namely 0.90231, and the last rank with the lowest Ki value, namely 0.67877, was Taluak Ambun Waterfall (A6).
Optimasi Penugasan Mekanik Menggunakan Metode Hungarian pada Dealer AUTO 2000 di Kota Padang Winanda, Rara Sandhy; Defitri, Fanessa Elrika; Rahmawati, Rahmawati
KUBIK Vol 8, No 2 (2023): KUBIK: Jurnal Publikasi Ilmiah Matematika
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.v8i2.29196

Abstract

Efficient placement of mechanics at Auto 2000 Dealer in Padang City has a significant impact on the productivity and profitability of the company. In this study, we propose the implementation of the Hungarian Method as an optimization tool to determine the optimal assignment of mechanics. The study involves five variables that, respectively, represent the availability of mechanics and various types of serviced vehicles. The goal is to minimize service time in order to optimize the number of vehicles that can be serviced per month. In this research, we utilize historical data that is collected from Auto 2000 dealers to analyze the performance of mechanic placement. The results show that by implementing optimal mechanic assignments using the Hungarian Method, the company can improve efficiency of service time as well as increase the number of vehicle units to be serviced per month to 1.957 units.
ANALISIS MODEL MANGSA PEMANGSA DENGAN PEMANENAN KONSTAN PADA POPULASI MANGSA Yulfani, Windi Ika; Winanda, Rara Sandhy
MATHunesa: Jurnal Ilmiah Matematika Vol. 12 No. 2 (2024)
Publisher : Universitas Negeri Surabaya

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

Abstract

ANALISIS BIFURKASI DINAMIKA POPULASI PENGRAJIN SONGKET DALAM MENJAGA EKSISTENSI KERAJINAN SONGKET PANDAI SIKEK Adryan, Muhammad Rizki; Winanda, Rara Sandhy
Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika Vol. 5 No. 3 (2024): Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistik
Publisher : LPPM Universitas Bina Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46306/lb.v5i3.653

Abstract

Songket is called the "Queen of Textiles" because of its beauty and luxury, combined with the sparkle of gold and silver threads, is one type of textile. However, the selling value and economic potential of songket in Nagari Pandai Sikek are not in line with the number of craftsmen. This phenomenon was analyzed using mathematical modeling, focusing on local stability. As a result, three equilibrium points were found. The first equilibrium point describes a state in which there are only potential craftsmen. Meanwhile, the second equilibrium point indicates the presence of potential craftsmen, proficient craftsmen aged 18-35 years, and professional craftsmen, but no proficient craftsmen over 35 years old. At the third equilibrium point, there are potential craftsmen, proficient craftsmen over 35 years old, and professional craftsmen, but there are no proficient craftsmen aged 18-35 years. Bifurcation analysis shows that if the value is ,, then the songket craftsmen can still survive. However, if it is  the songket craftsmen will experience rapid decline and will slowly become extinct
Co-Authors Adryan, Muhammad Rizki Afrianti, Yusita Ahmad, Defri Akira Mikail Alivia Tasya Kemala BATUBARA, RISKA AMALIA Defitri, Fanessa Elrika Defri Ahmad Devni Prima Sari Dewi Murni Dina Agustina Dina Fakhriyana Fadhilah, Muhammad Fauziah, Helena Fazila, Atika Helma Helma Khairani, Yasyfin Ikrima Liusman, rio Melia Catur Anggraini Muhammad Rashif Hilmi Nada Atifah Oktavia, Bella Pangaribuan, Yohanes Mangasitua Permana, Fajar Wisga Purwadi, Joko PUTRI WAHYUNI Putri, Ariana Putri, Sovia Helmi Rahmawati Rahmawati, Rahmawati Safitri, Reza Dwi Sari, Afriana Yustika Sari, Rida Purnama Tiara Vania Yulfani, Windi Ika