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Dewi Puspitasari
Program Studi Sastra Jepang Fakultas Ilmu Budaya Universitas Brawijaya
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Journal : Science and Technology Indonesia

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Ensemble Method of Multiple Decision Trees with Crisp and Fuzzy Discretization for Axial Surface Roughness Prediction Resti, Yulia; Yani, Irsyadi; Puspitasari, Dewi; Thamrin, Ismail; Saputra, M.A. Ade
Science and Technology Indonesia Vol. 10 No. 3 (2025): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.3.678-689

Abstract

AISI 1045 is a steel used to make engine components for motor vehicles and aircraft. The quality of AISI 1045 is influenced by its surface roughness, both axial and tangential. The prediction of AISI 1045 surface roughness aims to produce quality products in a shorter time and at a lower cost. The axial surface roughness is in the form of certain grades according to ISO. This method is a prediction technique that combines several single prediction models to obtain better prediction results. In this work, the ensemble method is built using a voting system from an odd number of single prediction models of the decision trees. The proposed Single Model consists of one decision tree model with crisp discretization (DT1) and three models with fuzzy discretization (DT2, DT3, and DT4). The research data were obtained through experiments measuring the axial surface roughness of AISI 1045 steel using a wet machining system by considering cutting speed, feed motion, axial depth of cut, and tangential surface roughness. The study’s results indicate that not all proposed ensemble models are built to have better performance than single prediction models. Of the four proposed single prediction models, only one model has an accuracy above 80%, namely the decision tree model with fuzzy discretization using a combination of linear-trapezoidal fuzzy membership functions (DT4 model). The model performance based on accuracy, recall, precision, F1-score, and AUC is 80.73%, 48.53%, 73.47%, 58.44%, and 67.72%, respectively. For the four ensemble models formed from the combination of three Single decision tree models, only the combination of DT1, DT2, and DT3 does not perform better than the Single model. The other three ensemble methods have better accuracy, recall, and AUC than the performance of all proposed Single models with values of 81.33 - 82.67%, 51.62 - 55.19%, and 69.04 - 71.02%, respectively.
The Symmetric Pattern Fuzzy Discretizationin Predicting Plastic Type for a Sorting System Using Decision Tree Methods Yani, Irsyadi; Marwani; Puspitasari, Dewi; Resti, Yulia
Science and Technology Indonesia Vol. 10 No. 3 (2025): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.3.789-801

Abstract

Plastics made from petroleum as the main ingredient cannot decompose quickly like organic materials, but rather take 500 years to 1000 years. Recycling plastic waste can significantly reduce the negative impacts that damage the environment. In addition, it can also reduce the use of natural resources as raw materials and energy use in the extraction process from mining to ready-for-use. In the process of recycling plastic bottle waste in industry, a sorting system is needed to sort the types of plastic bottle waste automatically, effectively, and efficiently. The system needs a prediction model with satisfactory performance. This research aims to build the prediction models of a plastic bottle waste sorting system with a fuzzy approach using the Decision Tree method. The main focus is fuzzy discretization with asymmetric pattern where the membership functions for the first and the last categories are balanced. Seven Decision Tree models are proposed in this study, six models with symmetric fuzzy discretization and one model with crisp discretization as a comparison. Three types of plastics are the objects of the study, namely Polyethylene Terephthalate (PET/PETE), High-Density Polyethylene (HDPE), and Polypropylene (PP). All three are types of plastics that are widely found in household waste. The unique contribution of this paper is that the symmetric pattern fuzzy discretization in the decision tree method can improve the performance of the decision tree model, but the combination of fuzzy membership functions used also contributes. Not all combinations used can improve the performance of the prediction model. Four of six models of symmetric fuzzy discretization have better performance than the decision tree model with crisp discretization. The combination of fuzzy membership functions consisting of linear and triangular functions provides the highest performance. Two models that do not perform better than crisp discretization are the linear-trapezoidal combination and the linear-Gaussian combination.
Co-Authors . Misbakhudin . Nalim Abdul Aziz Abdul Muis Abdul Rosyid, Ocid Achmad, Fendi Agnes Widyaningrum Agustina, Sri Mumaeni Ahmad Luqman Hakim Aji Nugroho Akmal Hidayat Alfan Arfian Amsal, Andi Yasir Andi Sukainah Andung Dwi Haryanto Aneka Firdaus Anitasari, Fariska Dyanis Annisa Rahmawati Anto Budi Listyawan Aprilia, Rizky Wulan Apriliyawan, Beni Arifin Arifin Arifin, Rahmad Ariska, Ria Arlando, Choga Ilham Arya Mahendra Sakti Aryanto, Zaki Yuli Aryanto Aspriyanto, Didit Astuti - Aswar Asyhar, Achmad Hanif At-Thoyyar, Aila Aulia Azahro , Fany Aulia, Noor Rizki Ayu Soraya, Imelia Ayu, Shinta Arini Barlin Barlin Chadijah, Andi Chusna Maulida Damayanti, Wulan Debby Saputera, Debby Diah Kusuma Pratiwi Diah Savitri Ernawati Diah Wulandari Diana Wibowo Didid Diapari Diniyati, Lena Sri Dyah Riandadari Dzimar, Muhammad Eka Marthanty Indah Lestari Eka Marthanty Indah Lestari, Eka Marthanty Indah Eka Utami, Nurhabibah Paramitha ELAH, ELAH Ellyanie Ellyanie Ellyza Herda Emalia, Lilis Eva Tuckyta Sari Sujatna Fachriani, Fachriani Fauzatinnisa, Amirah Ferly Isnomo Abdi Firdaus, I Wayan Arya Krishnawan Firiski, Edwi Febrian Firman Yasa Utama Firza, Firza ichmamudin sarfani Freddy, Antonius Ganda, Andita Ganda, Andita Nataria Fitri Ginta, Turnad Lenggo Gunawan Gunawan Gustini, Gustini Haedar, Ali Halim, Muhammad Bhilal Hardiyati*, Iin Hasan Basri Hatta, Isnur Hendri Chandra Hendry Hidalgo, Andres Migael Husda, Baso Riadi Hutapea, Felix Theo Yusama Ichrom Nahzi, Muhammad Yanuar IKA SARI RAKHMAWATI, NUR Imowanto, Yuddy Indah Lestari, Eka Marthanti Indarto Indarto Indri Erwhani Indrowaty, Sri Aju - Irsyadi Yani Ismail Thamrin Ismawati, Sekar Ismi Prihandari Isriani Hardini Izzatus Tsamroh, Dewi Jannah, Azzukhrufia Jayadilaga, Yadi Jusmiati Jusmiati Kartika Sari Wijayaningsih Kasamira Dewi Abrori, Rafila Khaeruddin, Rizky Khairima, Amina Khairina, Niketa Khasani Khasani Komariyah, Nor Laeli Lahming Lathiif, Abdul Lesmana, Nadella Lukman, Andi Maharani Laillyza Apriasari Maisaroh Maisaroh Manggala, Exgha Dwi Putra Manggalasari, Lena Citra Marlena Martini, Titin MARWANI Marwani Marwani, Marwani Maulida, Husna Meliyana R, Sitti Masyitah Muhammad Shulthoni Mukaromah, Nisaul Mustapha, Mazli Mutammam Nadhdhif Fikri Ferdiansyah Nadhifah, Umi Nada Nadya Inda Syartanti Najah, Syafinatunnajah Namira Aghnina, A.M. Della Nasrul, Nasrulloh Ibrahim Nazilah, Rohmatun Nikijuluw, Renata C.G.V Norma Nofianto Novanta, Nabella Maharani Nugroho, Bakti Adi Nur Insana Salam Nur Khasanah Nur Khasanah Nur Rahmah Nurhaliza, Diana Putri Ocid Abdul Rosyid Octaviana, Inggil Tiara Oppusunggu, Romiana Pamenang, Ferli Rycarhana Pindobilowo, Pindobilowo Prabowo, Janu Puji Astuti, Febru Purnomo Purnomo rahayu, eka puji Rahmah, Rayinda Eva Rahmah, Riezki Amalia Rahmania Pamungkas, Rahmania Rahmi Rahmi Ramadhani A, Gilang Ramli, Hartini Ramos Somya Ratnawati Ratnawati Razibi, Nor Diane Restiana, Evi Retno Dewi Ambarastuti Retno Pudji Rahayu Rhesa, Muhammad Riezky Maya Probosari Riman Sipahutar Riskiana * Ristiana, Evi Rosihan Adhani, Rosihan Rosyid, Ocid Abdul Rr. Poppy Puspitasari Saelan, Saelan Saldina, Iswatul Saleh, Andi Rahmat Saputra, M. A. Ade Saputra, M.A. Ade Saripah, Ai Setia Asyanti Setianingsih, Endang Setyaningrum, Novi Ayu Sherli Diana Sitepu, Alexander Sri Damayanti Sri Hartati Sri Wahyuni Sudarmanto Jayanegara Sukhemi Sukhemi, Sukhemi Sulistyorini, Elisa Sunyoto Sunyoto Suryandari, Dewi Taqiyuddin Ham, Muhammad Nabiel Tedjohartoko, Andrew Tjakradidjaja, Anita S Tjakradidjaja, Anita S Triyuliarto, Dwiwardoyo Ulfa, Faiza Ulfah, Mulia Ulum, Diah Ariibatul Utama Putra, Risky Utami, Juliyatin Putri Utami, Nurhabibah Paramitha Eka Wahyono, Edi Wahyuni, Titis Wardhana, Agung Satria Wardhani, Rr Arsyita Sri Widoretno, Yustin Setiya Wijaya, Nieke Andina Wirdateti Wirdateti, Wirdateti Wiwik Handayani Wulandari, Taurina Ayu Yanto, Subari Yuda, Mohammad Wira Yulendasari, Rika Yulia Resti Yusrinie Wasiaturrahmah Yustinasani, Katriana Zulkarnain Zulkarnain