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All Journal Saintia Matematika Journal of Mathematics Education and Application (JMEA) Sinkron : Jurnal dan Penelitian Teknik Informatika CARTESIUS : Jurnal Pendidikan Matematika MES: Journal of Mathematics Education and Science Journal of Research in Mathematics Trends and Technology Caring : Indonesian Journal of Nursing Science FARABI: Jurnal Matematika dan Pendidikan Matematika JURNAL MITRA PRIMA Journal of Mathematics Technology and Education Cartesius Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam (JURRIMIPA) Jurnal Agro Estate Konstanta : Jurnal Matematika dan Ilmu Pengelatuan Alam
Open Darnius
Program Studi Sarjana Matematika, FMIPA, Universitas Sumatera Utara, Medan-Indonesia 20155
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering 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 Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Nursing Physics Social Sciences Transportation Veterinary

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Risk Value Analysis of Gold Futures Trading Investment using Fundamental Analysis, Technical Analysis, and Value at Risk Hardiyanti, Widya; Darnius, Open
Journal of Research in Mathematics Trends and Technology Vol. 3 No. 1 (2021): Journal of Research in Mathematics Trends and Technology (JoRMTT)
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jormtt.v3i1.6468

Abstract

This study was conducted to analyze the value of risk in trading Gold Trading Futures using Fundamental Analysis, Technical Analysis and Value at Risk. Fundamental analysis that uses Wage Income data other than the Agriculture Sector (Non-Farm Payroll), the conditions of the United States economy, and demand for gold prices in the world. Technical Analysis uses Moving Average Convergence / Divergence, Relative Vigor Index, and Pivot Points. Value at Risk is based on normal errors and skewness / kurtosis. The results of the analysis shown are the MACD Indicator has a truth level of 146 out of 226 days of analysis or 64.602%, the RVI Indicator has a truth level of 220 days from 226 days of analysis or 97.345%, Fundamental Analysis has a truth level of 23 out of 23 Excited for a year or 100%. Based on the level of confidence = 95%, it can be concluded that the price of gold with the normal approach (\Psi_{normal}) = 1211.1984 and the price of gold with the skewness and kurtosis approach (\Psi_{SK}) = 1247.34072.
Goal Programming Model for Tutor Scheduling Nikmah, Herlin; Sutarman; Darnius, Open
Journal of Research in Mathematics Trends and Technology Vol. 3 No. 2 (2021): Journal of Research in Mathematics Trends and Technology
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jormtt.v3i2.8858

Abstract

This article presents goal programming model for tutor scheduling. Goal programming is the development of linear programming which has multiple objectives. Goal programming minimizes the deviation among the the desired level of goals and the actual achievement, which is achieved by changing inequality into equality by including positive and negative deviation variables accomplished by converting inequalities into equalities by including positive and negative deviation variables that allow the achievement below or above each goal. The results obtained from this model provide the optimal solutions where all objectives are achieved. This model also aims to achieve harmony and fairness between tutors and institutional management.
ANALISIS KEPUASAN MAHASISWA TERHADAP PROGRAM STUDI INDEPENDEN BERSERTIFIKAT DENGAN MENGGUNAKAN METODE REGRESI LOGISTIK ORDINAL Hartaty, Rembulan; Nasution, Putri Khairiah; Darnius, Open; Br Tarigan, Enita Dewi
MES: Journal of Mathematics Education and Science Vol 9, No 2 (2024): Edisi April
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/mes.v9i2.9234

Abstract

Studi independen bersertifikat merupakan program Kampus Merdeka yang memberikan kesempatan bagi mahasiswa untuk menguasai keterampilan spesifik. Untuk mengetahui keberhasilan dari program ini penting untuk mengetahui apakah program ini memenuhi harapan mahasiswa atau tidak. Penelitian ini bertujuan untuk menganalisis kepuasan mahasiswa terhadap program studi independen bersertifikat dan mengidentifikasi variabel apa saja yang berpengaruh secara signifikan dengan menggunakan metode regresi logistik ordinal. Data yang digunakan adalah data primer dengan menyebarkan kuisioner (goggle form). Hasil penelitian menunjukkan bahwa variabel yang berpengaruh secara signifikan terhadap kepuasan mahasiswa adalah pengajar (x_3 ) dan proyek akhir (x_7). Sedangkan variabel yang tidak berpengaruh secara signifikan antara lain materi pembelajaran (x_1), sistem pembelajaran (x_2), fasilitas dan akses yang diberikan oleh mitra (x_4), dukungan dari universitas (x_5), motivasi dan minat mahasiswa (x_6), interaksi sosial (x_8), dan sistem penilaian oleh mitra (x_9). Kepuasan mahasiswa secara keseluruhan terhadap program studi independen bersertifikat dipengaruhi oleh variabel independen sebesar 54.8%. Dari hasil odds ratio, setiap peningkatan satu unit dalam skala variabel pengajar (x_3) dan proyek akhir (x_7) mengakibatkan perubahan tingkat kepuasan mahasiswa masing-masing sebesar 1,43 dan 1,34 kali. Kata Kunci: Kepuasan Mahasiswa, Regresi Logistik Ordinal, Studi Independen Bersertifikat.
Mitigation of Environmental Exposure, Pollutants, and Endocrine Disruptors to Reproductive Health: A Literature Review Nur Afidarti; Open Darnius; Diah Lestari Nasution; Evi Indriani Br Karo
Caring: Indonesian Journal of Nursing Science Vol. 7 No. 1 (2025): Vol. 7 No. 1 (2025): Caring: Indonesian Journal of Nursing Science
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/ijns.v7i1.20009

Abstract

Women's reproductive health faces escalating threats from environmental pollutants, including airborne particulate matter (PM2.5 and PM10), endocrine-disrupting chemicals (EDCs), heavy metals, and microplastics. These pervasive agents, found in air, food, water, and consumer products, are associated with hormonal imbalances, menstrual irregularities, infertility, adverse pregnancy outcomes, and long-term reproductive dysfunction. This literature review synthesizes current evidence on environmental exposures, specifically focusing on pollutants and EDCs impacting reproductive health. Adhering to the PRISMA framework, articles published between 2020 and 2024 were systematically identified from databases such as PubMed, ScienceDirect, and Google Scholar. Manual selection based on predefined inclusion criteria ensured the relevance and recency of included studies. Findings consistently demonstrate that air pollutants (PM2.5 and PM10) correlate with reduced ovarian reserve and altered estradiol levels. EDCs, such as Bisphenol A (BPA) and phthalates, are linked to early puberty, endometriosis, and infertility. Heavy metals influence age at menarche and menopause, as well as critical pregnancy outcomes like birth weight. Furthermore, microplastics and nanoplastics have been shown to impair placental function and elevate oxidative stress. These cumulative findings underscore the urgent need for comprehensive risk mitigation strategies, encompassing environmental education, behavioral modifications, clinical screening, and policy reform. Nurses are uniquely positioned to play a critical role in promoting reproductive health through education, early detection of environmental risks, and advocacy for safer community environments.
Pelatihan dan Pemberdayaan Petani dalam Pengelolaan Pupuk Organik Cair di Desa Tala Peta, Kabupaten Deli Serdang Darnius, Open; Tarigan, Enita Dewi; Pasaribu, Albert; Yanti, Maulida; Balqis, Muthia Ferliani
Jurnal Mitra Prima Vol. 7 No. 1 (2025): JURNAL MITRA PRIMA
Publisher : Mitra prima

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

Abstract

The main problems for farmers, especially farmers from the Kelompok Tani Mamre, are the scarcity of subsidized fertilizers and the high price of non-subsidized fertilizers. This situation causes a decrease in agricultural productivity and farmer welfare, and increases dependence on chemical fertilizers that can pollute agricultural land. This community service is carried out to provide a solution by empowering farmers to produce liquid organic fertilizers independently, by utilizing local natural resources. This program uses three main stages of method: fertilizer needs survey, liquid organic fertilizer production training, and direct fertilizer production practice. The survey was conducted to understand the fertilizer needs in Desa Tala Peta. Furthermore, farmers are trained on local organic materials that can be used and fertilizer production techniques. The final stage is direct practice, where the results of fertilizer production will be used by farmers. This program is expected to reduce dependence on chemical fertilizers and support the formation of cooperative-based UMKM to market fertilizers sustainably.
Co-Authors Aghni Syahmarani Aritonang, Reanty Teresa Asima Manurung Bangun, Monica Natalia Br Tarigan, Enita Dewi br Tarigan, Ernita Dewi Diah Lestari Nasution Doloksaribu, Arsella F Eddy, Thaswin Elly Rosmaini Elvin Juliani Gulo Evi Indriani Br Karo Fahrul Rozi Harahap Hardiyanti, Siska Hardiyanti, Widya Hartaty, Rembulan Hasibuan, Citra Dewi Hasoloan M Nababan Henry Rani Sitepu Ide Prasanti Hutagalung Israil Sitepu Kristina Pestaria Sinaga Lingga, Sri Wahyuni Lisna Astria Mayanti, Utari Sri Meili Yanti Muthia Ferliani Balqis Mutia Sari Nasution, Muhammat Rayyan Nasution, Putri Khairiah Nikmah, Herlin Nofrida Elly Zendrato Nur Afidarti Parapat Gultom Pasaribu, Albert Pasukat Sembiring Rifalin Delustia Purba Rifan halomoan tua sinaga S, Benar Saragih, Yoga Fromega Siahaan, Megawati Simanullang, Herlin SRI WULANDARI Sutarman Sutarman Sutarman Sutarman Sutarman Sutarman, S Tarigan, Enita Dewi Tulus Tulus Ujian Sinulingga Wardani, Yuni Yanti, Maulida Yessica Thania Silaban