Vol. 22 No. 2 (2026): JANUARY 2026

Research Articles

• Nonlinear Robust Sliding Mode Control for Measles with Parameter Uncertainties

  Sailah Ar Rizka, Regina Wahyudyah Sonata Ayu, Hanna Hilyati Aulia, M. Ziaul Arif, Millatuz Zahroh

  256-275

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• Application of Small Area Estimation for Global Hunger Index at Regency/Municipality Level in Papua Island

  Randy Aditya, Azka Ubaidillah

  276-290

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• European Option Pricing Using Trinomial Method with Dividend

  Andi Karina Dwi Maharani, Emy Siswanah

  291-300

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• Poisson-Exponential Distribution Approach to Survival Analysis of Right-Censored Data of Lung Cancer Patients

  Andi Isna Yunita, Nurtiti Sunusi

  301-314

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• A Study of (R,S)-Bimodules Homomorphisms

  Dian Ariesta Yuwaningsih, Indah Emilia Wijayanti, Budi Surodjo

  315-321

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• Modeling the Percentage of Poor Population in West Sumatra in 2024 Using Nonparametric B-Spline Regression

  Imroatul Lathifah, Fadhilah Fitri, Fitri Mudia Sari

  322-337

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• Rainfall Forecasting Using Gaussian Process Regression with Brownian Motion Prior (Case Study: Special Region of Yogyakarta Province)

  Syifaul Janan

  338-350

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• Forecasting The Price of Red Bird's Eye Chili in Southeast Sulawesi Province Containing Outlier Data Using ARIMA Method with Iterative Procedure

  Astrid Widyaningsih, Makkulau Makkulau, Lilis Laome

  351-362

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• Forecasting The Number of ASEAN Tourists in Indonesia: The Impact of The COVID-19 Pandemic Using Intervention Analysis

  Nabilah Putri Noor Faizah, Retno Budiarti, Nur Agustiani

  363-379

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• Evaluation of Waterpark Performance Using Distance Measure on Pythagorean Fuzzy Sets

  Amaluddin Amaluddin, Agung Sutrisno, Lilis Dwi Sapta Aprilyani

  380-394

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• Skin Brightening Effects of Ascorbic Acid with ACTISOLV™ Integration: A Longitudinal Analysis Using Repeated Measures ANOVA

  Dita Amelia, Suliyanto Suliyanto, Arinda Mahadesyawardani, Nur Azizah, Jovansha Ariyawan, R. Arya Januarta Adiputra, Irsyad Yoga Adyatma

  395-406

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• Numerical Simulation of Thermal Newtonian Fluid Flow Driven by Horizontal Convection in A Porous Cavity

  Rina Reorita, Agus Yodi Gunawan, Novry Erwina

  407-416

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• Geometric Anisotropic Semivariogram Modelling of Hotspot Confidence Levels in South Matan Hilir Subdistrict

  Ari Ratna Gumilang, Sandy Vantika

  417-426

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• The Best Model of the Autoregressive Integrated Moving Average (ARIMA) Method for Predicting the Exchange Rate of the Indonesian Rupiah Against the US Dollar (USD) for the Period July 2025 - June 2026

  Desiana Putri, Meliyana Bohori

  427-435

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• Actuarial Estimation of Unit-Linked Insurance Benefits Using the Point-to-Point Method with De Moivre’s Law

  M. Marisa, Aldila Nur Indah Berliana Ratam, Agus Irawan, Nasrullah Nasrullah, Nanda Azzanina

  436-446

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• Analysis of Open Unemployment Rates in Indonesia Based on GRDP and the Percentage of Poor Population Using Nonparametric B-Spline Regression

  Nadila Riska Afifah, Admi Salma

  447-458

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• Small Area Estimation for Gross Enrollment Rate at the College Level Using a Hierarchical Bayes Approach

  Muh. Taslim Hakim, Azka Ubaidillah

  459-468

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• Dynamic Analysis of the SIRS Model with a Type III Holling Function on the Corrosion Distribution of Bridge Reinforcement Steel in Coastal Areas

  Ahmadi Ahmadi

  469-485

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• Zero-Inflated Integer Autoregressive (ZINAR) Approach in Modeling Major Earthquakes in Sumatra Region

  Indah Wahyuliani, Jose Rizal, Sigit Nugroho

  486-498

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• Survival Analysis Of Diabetes Mellitus At RSUP Dr. Tadjuddin Chalid Makassar

  Nurul Rahmadani, Ermawati Ermawati, Adnan Sauddin, Irwan Irwan

  499-510

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• Random Forest vs Elastic-Net Penalized Logistic Regression for Patient Discharge Classification in BPJS Primary Care

  David Kevin Hutabarat, Sawaluddin Sawaluddin, Syahriol Sitorus, Sutarman Sutarman

  511-526

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• Mathematics Model SAHTR for the Number of Drug Abusers with Economic and Educational Factors

  Wahyuni Qaila Rahmah, Kartika Yulianti, Endang Cahya Mulyaning Asih

  527-539

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