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All Journal Eksakta : Berkala Ilmiah Bidang MIPA Pelita Eksakta Jurnal Pengabdian Pada Masyarakat
Dina Agustina
Departemen Matematika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Negeri Padang
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University Students' Procrastination: A Mathematical Model (Case Studies: Student in Mathematics Department Universitas Negeri Padang) Rara Sandhy Winanda; Akira Mikail; Defri Ahmad; Dina Agustina; Rahmawati Rahmawati
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (756.19 KB) | DOI: 10.24036/eksakta/vol23-iss02/315

Abstract

Mathematical modeling of procrastination was carried out on students in the Mathematics Department at Universitas Negeri Padang. Procrastination is the tendency to delay work and can be contagious among students. Mathematical modeling of procrastination aims to show the spread of procrastination among students. The SEIR compartment model was applied in this study. From a total of 1,154 population members, 93 samples were randomly selected and were given a questionnaire to estimate the parameter values in the model. A couple of steady states appear in the model. The free disease steady state has a biological meaning since all the variables are real, while the endemic steady state is surreal in biological terms. The number of its basic reproduction number, from which the parameter values are derived from the primary data, indicates stability analysis near the free disease steady states. The result shows that procrastination is spread among students in the population, with the number of Ro is 1,009.
Comparison of Portfolio Mean-Variance Method with the Mean-Variance-Skewness-Kurtosis Method in Indonesia Stocks Dina Agustina; Devni Prima Sari; Rara Sandhy Winanda; Muhammad Rashif Hilmi; Dina Fakhriyana
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (788.102 KB) | DOI: 10.24036/eksakta/vol23-iss02/316

Abstract

In this paper, we compare the optimal portfolio weight of mean-variance (MV) method with mean-variance-skewness-kurtosis (MVSK) method. MV is a method to get weight on a portfolio. This method can be developed into the method of MVSK with attention to the higher-order moment of return distribution; skewness and kurtosis. In determining the weight of portfolio is also important to consider the skewness and kurtosis of return distribution. This method of considering the aspect of skewness and kurtosis is called the MVSK method with the aim of maximizing the level of return and skewness and minimizing the risks and exceeding of kurtosis. The result indicate that the optimal portfolio return of all methods is MVSK method with minimize variance priority.
Pembuatan Pupuk Kompos Dari Limbah Kulit Kopi Di Daerah Penghasil Kopi Nagari Koto Tuo, Sumatera Barat Riga Riga; Trisna Kumala Sari; Dina Agustina; Bali Yana Fitri; Muhammad Habibul Ikhsan; Ferdi Henfi Pratama; Wandi Oktria
Jurnal Pengabdian Pada Masyarakat Vol 7 No 3 (2022): Jurnal Pengabdian Pada Masyarakat
Publisher : Universitas Mathla'ul Anwar Banten

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (454.722 KB) | DOI: 10.30653/002.202273.145

Abstract

MAKİNG COMPOST FERTİLİZER FROM COFFEE PEEL WASTE İN THE NAGARİ KOTO TUO COFFEE-PRODUCİNG AREA, WEST SUMATRA. Coffee husk waste in the Nagari Koto Tuo coffee producing area is not used optimally. It just became a pile of garbage in several places. The others were burned which can cause health problems in the future. One alternative to manage coffee husk waste is to fermentate it into compost. The community service for the bioconversion of coffee husk waste into fertilizer is carried out in three steps. The aim of this activity is to increase the knowledge and skills of the community in utilizing coffee skin waste. The practice of making compost was carried out in a composter using the EM-4 bioactivator. The achievement obtained from this community service was that participants were able to understand the bioconversion process of coffee skin waste into compost, which was proven by the percentage of knowledge and skills (greater than 80%).
Construction Of Mathematics Materials Through Lesson Study Supported By ICT-Based Learning Media In MGMP Mathematics of SMP Negeri District X Koto Solok District Dina Agustina
Pelita Eksakta Vol 6 No 1 (2023): Pelita Eksakta Vol. 6 No. 1
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol6-iss1/200

Abstract

Based on observations and discussions with several mathematics teachers at Singkarak State Middle School, X Koto Singkarak District, Solok Regency, problems were found in learning mathematics, namely students still had difficulty understanding mathematical concepts and students were less active in the learning process. An indication of this is the low student learning outcomes. Teachers still do not utilize learning models and media that can attract students' interest in learning. Conducted training on strengthening mathematics material through ICT-based lesson study. The results showed that there was an increase in the teacher's understanding of the material, the teacher's skills in making learning media and the teacher's proficiency in using IT-based learning media.
Co-Authors Akira Mikail Bali Yana Fitri Defri Ahmad Devni Prima Sari Dina Fakhriyana Ferdi Henfi Pratama Muhammad Habibul Ikhsan Muhammad Rashif Hilmi Rahmawati Rara Sandhy Winanda Riga Riga Trisna Kumala Sari Wandi Oktria