Vol 8, No 2: August 2025

DOI: https://doi.org/10.37905/jjom.v8i2

In Progress Issue. The DOI will be activated soon.

Table of Contents

Articles

On Deformed-Metric Equivalence of Hilbert Space Operators
DOI : 10.37905/jjom.v8i2.36685 | Abstract views : 11 times
Amenya Collins,  Maasai Mara University,  Kenya
Victor Wanjala,  Maasai Mara University,  Kenya
John Matuya,  Maasai Mara University,  Kenya
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138-142
The Expected-Based Method of Value-at-Risk Prediction
DOI : 10.37905/jjom.v8i2.37273 | Abstract views : 17 times
Jacob Stevy Seleky,  Matana University,  Indonesia
Lina Cahyadi Cahyadi,  Pelita Harapan University,  Indonesia
Sausan Ramadhani,  Matana University,  Indonesia
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143-151
A Construction of a Smooth Travel Groupoid on a Spanning Tree Associated with Lotus Graphs
DOI : 10.37905/jjom.v8i2.38029 | Abstract views : 46 times
Husnul Khotimah,  Universitas Sriwijaya,  Indonesia
Andi Tenri Ajeng Nur,  Universitas Sriwijaya,  Indonesia
Putri Nilam Cayo,  Universitas Sriwijaya,  Indonesia
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152-158
Optimal Control of an Age-Structured Pneumonia Transmission Model with Vaccination and Treatment Strategies
DOI : 10.37905/jjom.v8i2.38190 | Abstract views : 15 times
Dwi Lestari,  Universitas Negeri Yogyakarta,  Indonesia
Nikenasih Binatari,  Universitas Negeri Yogyakarta,  Indonesia
Eminugroho Ratna Sari,  Universitas Negeri Yogyakarta,  Indonesia
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159-168
Modeling and Optimizing State-Based Electricity Consumption Distributions in Dodoma Region, Tanzania Using Hidden Markov Models
DOI : 10.37905/jjom.v8i2.34047 | Abstract views : 11 times
Eliasi M Jeremiah,  University of Mzumbe, Morogoro,  Tanzania, United Republic of
Ramkumar T Balan,  The University of Dodoma, Dodoma,  Tanzania, United Republic of
Jairos K. Shinzeh,  The University of Dodoma, Dodoma,  Tanzania, United Republic of
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169-187
Hyperparameter-Optimized Gradient Boosting for Daily Rainfall Prediction Using BMKG Meteorological Data in Malang Regency, Indonesia
DOI : 10.37905/jjom.v8i2.38554 | Abstract views : 16 times
Mohamad Arif Abdul Syukur,  UIN Maulana Malik Ibrahim,  Indonesia
Suhartono Suhartono,  UIN Maulana Malik Ibrahim,  Indonesia
Mochamad Imamudin,  UIN Maulana Malik Ibrahim,  Indonesia
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188-201
Geographically and Temporally Weighted Log-Logistic 3-Parameter Regression Model for Poverty Severity Index : A Case Study on East Java Province
DOI : 10.37905/jjom.v8i2.38021 | Abstract views : 15 times
Nur Huda,  Institut Teknologi Sepuluh Nopember,  Indonesia
Purhadi Purhadi,  Institut Teknologi Sepuluh Nopember,  Indonesia
Tintrim Dwi Ary Widhianingsih,  Institut Teknologi Sepuluh Nopember,  Indonesia
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202-208
Optimal IDX30 Stock Portfolio Construction Using a Two-Constraint Mean-Variance Model with Robust S-Estimation
DOI : 10.37905/jjom.v8i2.39603 | Abstract views : 0 times
Anis Faiqo Tuzzainiyah,  Universitas Tanjungpura,  Indonesia
Evy Sulistianingsih,  Universitas Tanjungpura,  Indonesia
Nurfitri Imro’ah,  Universitas Tanjungpura,  Indonesia
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209-217
The Connection Between Jordan Derivations and Nilpotent Derivations on 2-Torsion-Free Semiprime Rings
DOI : 10.37905/jjom.v8i2.37723 | Abstract views : 0 times
Rahmah Mutiara Ayu Ningtiyas,  Universitas Lampung,  Indonesia
Fitriani Fitriani,  Universitas Lampung,  Indonesia
Ahmad Faisol,  Universitas Lampung,  Indonesia
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218-226