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 : 37 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 : 47 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 : 73 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 : 29 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 : 34 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 : 43 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 : 37 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 : 27 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 : 131 times
Rahmah Mutiara Ayu Ningtiyas,  Universitas Lampung,  Indonesia
Fitriani Fitriani,  Universitas Lampung,  Indonesia
Ahmad Faisol,  Universitas Lampung,  Indonesia
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218-226
Mathematical Modeling and Parameter Estimation of Meningitis Transmission Dynamic using Vaccination Strategies in Indonesia
DOI : 10.37905/jjom.v8i2.39751 | Abstract views : 7 times
Aufa Al Musyarof,  Institut Teknologi Sepuluh Nopember,  Indonesia
Faris Nur Hibban,  Institut Teknologi Sepuluh Nopember,  Indonesia
Mardlijah Mardlijah,  Institut Teknologi Sepuluh Nopember,  Indonesia
Didik Khusnul Arif,  Institut Teknologi Sepuluh Nopember,  Indonesia
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227-234
Joint Life Long-Term Care Insurance: A Semi-Markov Multi-State Model Integrating LTC Prevalence and Mortality Trends
DOI : 10.37905/jjom.v8i2.39021 | Abstract views : 7 times
Roro Anteng,  Universitas Gadjah Mada,  Indonesia
Adhitya Ronnie Effendie,  Universitas Gadjah Mada,  Indonesia
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235-241
Parameter Estimation of a Climate-Based Dengue Mathematical Model in Bandung City Using the Particle Swarm Optimization Algorithm
DOI : 10.37905/jjom.v8i2.39153 | Abstract views : 1 times
Sindi Meli Nur Afni,  Universitas Pendidikan Indonesia,  Indonesia
Khusnul Novianingsih,  Universitas Pendidikan Indonesia,  Indonesia
Ririn Sispiyati,  Universitas Pendidikan Indonesia,  Indonesia
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242-256