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All Journal Owner : Riset dan Jurnal Akuntansi Data Science: Journal of Computing and Applied Informatics Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang Djtechno: Jurnal Teknologi Informasi Jurnal Nasional Holistic Science Journal of Software Engineering, Information and Communication Technology Jurnal Pengabdian Masyarakat Gemilang (JPMG) Wahana Jurnal Ilmiah Ilmu Terapan Universitas Jambi NUMBERS: Jurnal Pendidikan Matematika dan Ilmu Pengetahuan Alam JS (Jurnal Sekolah) Statistika Jurnal Asimilasi Pendidikan Hanif Journal of Information Systems Journal of Mathematics, Computation and Statistics (JMATHCOS) Konstanta : Jurnal Matematika dan Ilmu Pengelatuan Alam Interdisciplinary Explorations in Research Journal (IERJ)
Sisti Nadia Amalia
Universitas Negeri Medan
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Physics Public Health Social Sciences Other

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Graph-Theoretic Analysis of Weighted Neighborhood Graphs for Spatial Soil Nutrient Prediction Nurul Maulida Surbakti; Sisti Nadia Amalia; Muhammad Ashari; Riza Pahlwan
Journal of Mathematics, Computations and Statistics Vol. 9 No. 3 (2026): Volume 09 Issue 03 (September 2026)
Publisher : Jurusan Matematika FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/fazqcb69

Abstract

Soil nutrient prediction is a spatial modeling problem because nutrient values observed at nearby locations may share common spatial structure. This study develops a graph-theoretic analysis of weighted neighborhood graphs for Graph Convolutional Network (GCN)-based prediction of synthetic nitrogen (N), phosphorus (P), and potassium (K) patterns. Ten independent Monte Carlo realizations of 100 sampling locations were generated from a uniform distribution on the unit square. For each realization, weighted k-nearest-neighbor (kNN) and epsilon-neighborhood graphs were constructed using an exponential distance-decay kernel. Graph structure was quantified using the number of edges, average degree, density, number of connected components, and algebraic connectivity. Separate transductive GCN regressors were trained for N, P, and K using  train-validation-test splits, target standardization based only on the training set, early stopping, and repeated random seeds. Binary GCN, multilayer perceptron (MLP), Random Forest, and inverse-distance weighting (IDW) were included as baselines. Among the tested graph configurations, kNN with  gave the lowest mean test error , whereas kNN with  produced a marginally higher mean . Weighted GCN improved numerically over binary GCN overall , with a significant paired improvement in MAE under a Wilcoxon test , although MLP remained slightly stronger overall . Across graph configurations, density was negatively associated with test  indicating that excessive neighborhood mixing can reduce predictive performance in these controlled settings. Nutrient-specific analysis showed that phosphorus was the most difficult target, while residual Moran’s I values were close to zero. Within the controlled synthetic scenarios, weighted neighborhood graphs provided a useful and interpretable representation for GCN-based spatial nutrient modeling. Future work should evaluate the framework on field measurements using spatial block validation and environmental covariates.
FRIEZE-BASED DIGITAL MOTIF GENERATION FOR MANDAILING ANGKOLA ULOS USING A MATLAB GRAPHICAL USER INTERFACE Kartika, Dinda; Niska, Debi Yandra; Nasution, Hamidah; Amalia, Sisti Nadia; Syahputra, Fikri
Jurnal Ilmiah Ilmu Terapan Universitas Jambi Vol. 10 No. 5 (2026): Volume 10, Nomor 5, October 2026
Publisher : LPPM Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jiituj.v10i5.58811

Abstract

This study develops a computational approach to generating digital motifs for Mandailing Angkola ulos based on seven frieze patterns. We examined two ceremonial textiles, Abit Godang and Parompa Sadum, to identify 16 basic motifs (nine and seven, respectively) based on their visual characteristics, documented philosophical meanings, and suitability for one-directional repetition. We developed a MATLAB-based graphical user interface (GUI) to support textile selection, motif cropping, visual adjustment, and frieze-based generation. Each basic motif was processed using all seven frieze types (F1–F7), which employ distinct combinations of translation, reflection, half-turn rotation, and glide reflection. The computational process generated 112 motif outputs, comprising 63 variations from Abit Godang and 49 from Parompa Sadum. The resulting designs exhibit different linear symmetry arrangements while retaining recognizable visual elements of their source motifs. Representative outputs generated using F7 illustrate how a single motif can be reorganized through repeated and reflected configurations. This study contributes a structured workflow integrating traditional motif documentation, geometric transformation, and digital design. The proposed approach supports further exploration of culturally informed motif variations for textile and decorative applications, while assessment of cultural acceptance and practical use remains a subject for future research.
Co-Authors Ade Andriani Afiati Nasution, Nadrah Andy Satria Anita Talia ARNAH RITONGA Debi Yandra Niska Dian Septiana Dinda Kartika Erita Astrid Fahmi Ashari S. Sihaloho Fanny Ramadhani Fevi Rahmawati Suwanto Fikri Syahputra Fikri Syahputra Hafizha Zahra Hutapea, Risca Octaviyani Ichwanul Muslim Karo Karo Juliana Tampubolon Manullang, Sudianto Marwan Faiz Hilmi Muhammad Ashari Muhammad Ashari Nadrah Afiati Nasution, Hamidah . Niska, Debi Yandra Nurhasanah Siregar Nurul Maulida Surbakti Panggabean, Natanael Putri Maulidina Fadilah Ramadhani, Fanny Riza Pahlwan Septi Melani Putri Tambunan Septia Cahaya Sari Sipayung Shalsha Nazillah Sitepu, Eliya Suci Ramadhani Sudianto Manulang Sukma Dermawan Saragih Surya Alenta Nababan Susi Setiawati Talitha Nakhwan Hasibuan Tarigan, Dandi Rifa'i Thanaya Lovry Lastiar Trinita Melyana Hutagalung Triyunita, Gizka Wahyuni Susi Sulastri Berasa Widya Narti Lubis Witri Wardani Hulu Yasifati Hia Yasmin Azzahra Yohana Sitorus Zul Amry