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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Neutrino : jurnal fisika dan aplikasinya Kappa Journal Geosfera: Jurnal Penelitian Geografi
Nyuswantoro, Ukta Indra
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Astronomy Earth & Planetary Sciences Education Environmental Science Physics Social Sciences Other

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Predicting Ocean Current Temperature Off the East Coast of America with XGBoost and Random Forest Algorithms Using Rstudio Alfaris, Lulut; Firdaus, Anas Noor; Nyuswantoro, Ukta Indra; Siagian, Ruben Cornelius; Muhammad, Aldi Cahya; Hassan, Rohana; Aunzo, Jr., Rodulfo T.; Ariefka, Reza
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 2 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.2.273-284

Abstract

This research investigates the comparative predictive efficacy of two leading machine learning methodologies, specifically the XGBoost and Random Forest models, in estimating ocean temperature dynamics in the TS Gulf Stream and Labrador Current regions along the east coast of North America. Using annual temperature datasets and relevant oceanographic parameters, the data is carefully processed, cleaned and sorted into training and test subsets via the RStudio Platform. The performance evaluation model is carried out using predetermined machine learning assessment criteria, including Mean Absolute Error (MAE), Root Mean Squared Error (RMSE), Mean Squared Error (MSE), and R-squared. The results show the superiority of the XGBoost model compared to Random Forest in terms of prediction accuracy and minimizing prediction errors. The XGBoost model shows lower MSE values and higher R-squared values than the Random Forest model, indicating its better capacity in explaining data variations. XGBoost consistently provides more accurate predictions and shows higher sensitivity in identifying important factors influencing ocean temperature fluctuations than Random Forest. This research significantly improves understanding and prognostic capabilities regarding ocean temperature dynamics in the TS Gulf Stream and Labrador Current regions. Empirical evidence underlines the efficacy of the XGBoost model in predicting ocean temperatures in the studied region. Continuous model evaluation and parameter refinement for both methodologies is critical to establishing standards for optimal prediction performance. The findings of this research have implications for the fields of oceanography and climate science, and offer potential pathways to comprehensively understand and mitigate the impacts of climate change on marine ecosystems.
VISUALIZATIONS AND ANALYSES OF QUANTUM BEHAVIOR, SPACETIME CURVATURE, AND METRIC RELATIONSHIPS IN RELATIVISTIC PHYSICS Sinaga, Mardame Pangihutan; Pandara, Dolfie Paulus; Nyuswantoro, Ukta Indra; Nasution, Budiman; Siagian, Ruben Cornelius
Jurnal Neutrino:Jurnal Fisika dan Aplikasinya Vol 16, No 1 (2023): October
Publisher : Universitas Islam Negeri Maulana Malik Ibrahim Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/neu.v16i1.20641

Abstract

This study aims to investigate essential concepts in quantum mechanics and theoretical physics, with an emphasis on the 1+1 dimension. We examine the Dirac equation for relativistic spin-1/2 particles, the Time-Dependent Schrödinger Equation in 1+1 spacetime with flat conformal metric, and connect them to the Dirac equation. Additionally, we explore the Alcubierre Metric related to warp drive, particle modeling in a harmonic potential using the Schrödinger Equation, and the Gödel Metric Solution to depict the peculiarities of spacetime. The research aims to deepen the understanding of these concepts, identify theoretical implications, and their potential applications. This research aims to enhance the understanding of fundamental physics, assist in the development of future technologies, and provide deeper insights into the universe. Its benefits lie in contributing to theoretical understanding in physics, which can spark the development of new theories. This study is limited to physics concepts in the 1+1 dimensions, without empirical experiments or practical applications. The primary focus is on the theoretical analysis of these concepts. The results of this research have potential theoretical implications in understanding basic physics and spacetime phenomena. The simplification and connections between these concepts can aid in the development of new theories in theoretical physics. The uniqueness of this research lies in its integrative approach to quantum mechanics and theoretical physics concepts in the 1+1 dimension, which may not have been extensively explored previously. Through this research, we have investigated several key concepts in quantum mechanics and theoretical physics in the 1+1 dimension. These findings can make a significant contribution to our understanding of the universe and the potential development of new theories in physics.
Separation of Variables Method in Solving Partial Differential Equations and Investigating the Relationship between Gravitational Field Tensor and Energy-Momentum Tensor in Einstein's Theory of Gravity Siagian, Ruben Cornelius; Alfaris, Lulut; Nurahman, Arip; Muhammad, Aldi Cahya; Nyuswantoro, Ukta Indra; Nasution, Budiman
Kappa Journal Vol 7 No 2 (2023): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i2.20921

Abstract

This research delves into the study of partial differential equations (PDEs) and gravitational fields in spacetime. It focuses on solving PDEs using the Separation of Variables method and explores the relationship between the gravitational field tensor and the energy-momentum tensor, leading to the final equation for the gravitational field tensor. The research also investigates Einstein's theory of gravity and the energy-momentum tensor integral, providing the general solution for the gravitational potential and its implications. Additionally, the mean integration of the gravitational wave tensor is analyzed, yielding an expression for the tensor strain of gravitational waves over an infinitely long period. The components of the gravitational wave tensor and their effect on gravitational sources are examined. Furthermore, the propagation of electromagnetic fields in spacetime is studied using the Retarded Green's Function. The primary objectives of this research are to understand and explore mathematical techniques for solving PDEs and analyzing gravitational fields and their interactions in spacetime. The integration of multiple theoretical concepts related to PDEs, gravitational fields, and electromagnetic fields enhances our understanding of fundamental physics principles. This contributes to the advancement of theoretical physics and opens avenues for potential practical applications, such as gravitational wave detection and electromagnetic field propagation in complex media. In conclusion, this research provides valuable insights into fundamental physics principles and fosters a deeper understanding of their interconnections and implications
Correlation Between Seismicity Rates and Earthquake Return Periods in the Southern Offshore of West Java, Indonesia Alfaris, Lulut; Wahyudi, Andri; Ginanjar, Martin Anjar; Nyuswantoro, Ukta Indra; Laeiq, Nazish
Geosfera: Jurnal Penelitian Geografi Vol 4, No 2 (2025): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v4i2.36433

Abstract

The Indian Ocean region south of Java constitutes a highly active seismic zone dominated by the subduction of the Indo-Australian plate beneath the Eurasian plate. This study investigates the seismicity parameters (a-value and b-value) using the Gutenberg-Richter law and estimates the return periods of significant earthquakes. Analyzing earthquake catalog data covering a span of 53 years, we identified the Magnitude of Completeness (Mc) and calculated frequency-magnitude distributions. The results reveal a b-value of 1.17, indicating a region characterized by high material heterogeneity and complex stress release mechanisms. Furthermore, the probabilistic return period for a magnitude 6.5 earthquake is estimated to be approximately 19.24 years. These findings suggest that while the region exhibits frequent moderate-magnitude energy release, the potential for destructive tsunamigenic events remains significant, necessitating robust hazard mitigation strategies for the southern coast of Java.
Seasonal Variability of Surface Ocean Currents in the Southern Java Offshore based on Global Reanalysis Data Rahman, Abdul; Alfaris, Lulut; Wahyudi, Andri; Firdaus, Anas Noor; Nyuswantoro, Ukta Indra; Laeiq, Nazish
Geosfera: Jurnal Penelitian Geografi Vol 4, No 2 (2025): Geosfera : Jurnal Penelitian Geografi
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/geojpg.v4i2.37281

Abstract

Surface ocean currents are a key component of marine circulation systems and play an important role in controlling physical and ecological processes in Indonesian sea. The Southern Java sea, which are directly connected to the eastern Indian Ocean, are characterized by dynamic surface circulation influenced by large-scale oceanic processes and seasonal monsoonal forcing. This study investigates the patterns and characteristics of surface ocean currents in the Southern Java sea using global ocean reanalysis data visualized through the Earth Nullschool platform. Seasonal variability was examined using representative monthly maps corresponding to the major phases of the Asian and Australian monsoon system, including January (West Monsoon), April (first transition season), July (East Monsoon), and October (second transition season). A descriptive analytical approach was applied to identify spatial and temporal variations in surface current direction and relative intensity across both coastal and offshore areas. The analysis reveals distinct seasonal differences in surface current behavior. During the East Monsoon period, surface currents exhibit stronger intensity and a more consistent alongshore orientation, reflecting enhanced wind-driven circulation and offshore transport. In contrast, the West Monsoon and transitional seasons are marked by weaker currents and greater directional variability, particularly in nearshore sea. These findings indicate that monsoonal wind forcing, combined with large-scale Indian Ocean circulation, is the primary driver of surface current variability in the study area. This study highlights the usefulness of reanalysis-based visualization for regional-scale oceanographic assessments in areas with limited in-situ observations. The results provide baseline information that supports regional oceanographic research and offers practical insights for marine resource management, fisheries, navigation, and coastal planning in the Southern Java sea
Co-Authors Abdul Rahman Aldi Cahya Muhammad ANDRI WAHYUDI, ANDRI Ariefka, Reza Aunzo, Jr., Rodulfo T. Budiman Nasution Firdaus, Anas Noor Hassan, Rohana Laeiq, Nazish Lulut Alfaris Martin Anjar Ginanjar Nurahman, Arip Pandara, Dolfie Paulus Siagian, Ruben Cornelius Sinaga, Mardame Pangihutan