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All Journal Jurnal Sains dan Seni ITS Gamatika BAREKENG: Jurnal Ilmu Matematika dan Terapan Inferensi Madaniya Sewagati Parameter: Jurnal Matematika, Statistika dan Terapannya
Diaz Fitra Aksioma
Departemen Statistika Institut Teknologi Sepuluh Nopember
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Journal : Inferensi

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Pengendalian Kualitas Gula Kristal Putih (GKP) di PG Tjoekir Jombang Menggunakan Diagram Kontrol Multivariat Berbasis Time Series Muhammad Salam Taufiqi; Diaz Fitra Aksioma
Inferensi Vol 1, No 1 (2018): Inferensi
Publisher : Department of Statistics ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (676.81 KB) | DOI: 10.12962/j27213862.v1i1.6716

Abstract

PG Tjoekir Jombang merupakan salah satu unit usaha dari PTPN X yang bergerak pada bidang pengadaan gula. Salah satu produk utama yang dihasilkan oleh PG Tjoekir Jombang adalah Gula kristal putih yang harus memenuhi kriteria Standar Nasional Indonesia (SNI). Karakteristik kualitas yang digunakan adalah warna larutan gula (ICUMSA) dan Besar Jenis Butir. Kedua karakteristik tersebut memiliki hubungan yaitu jika semakin kecil BJB maka ICUMSA akan semakin putih. hal itu menjelaskan jika semakin putih maka kualitas gula kristal putih semakin baik. Proses monitoring kualitas gula kristal putih dilakukan untuk menjaga kualitas dari gula yang dihasilkan oleh PG Tjoekir Jombang. Pengendalian kualitas menggunakan diagram kontrol multivariat berbasis time series lebih sesuai digunakan karena asumsi yang harus terpenuhi adalah tidak adanya autokorelasi antar pengamatan. Diagram kontrol dibuat berdasarkan residual dari model terbaik. Model terbaik yang diperoleh yaitu dengan menggunakan model VAR (3). Hasil diagram kontrol menunjukkan bahwa variabilitas dan rata-rata proses belum terkendali secara statistik. Salah satu penyebabnya adalah terjadinya kerusakan pada mesin dikarenakan setting mesin dan usia mesin saat sedang beroperasi, faktor tenaga kerja yang kurang teliti dan beberapa faktor yang lainnya.
Pengendalian Kualitas Semen PCC di PT Semen Bosowa Banyuwangi Menggunakan Maximum Half-Normal Multivariate Control Chart (Max-Half-Mchart) Loka, I Melda Puspita; Khusna, Hidayatul; Aksioma, Diaz Fitra
Inferensi Vol 7, No 1 (2024)
Publisher : Department of Statistics ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j27213862.v7i1.16247

Abstract

Cement is a building adhesive material produced from clinker and has the main ingredients in the form of calcium silicate and additional gypsum. The Indonesian Cement Association (ASI) states that there will be an increase in domestic cement consumption by 5.5% in 2021. Competition in the industrial sector is quite tight, causing PT Semen Bosowa Banyuwangi maintain and improve the quality of its products continuously. One of the steps taken is to check for blaine, residual, and free lime through the laboratory before the cement is distributed. Since there are more than one quality characteristic of Portland Composite Cement (PCC) and each quality characteristic is monitored every shift, the control chart used is a multivariate control chart for individual observations in the form of a Max-Half-Mchart. The Max-Half-Mchart for individual observation can effectively monitor mean and process variability simultaneously. PCC cement quality control using the Max-Half-Mchart in phase I showed that the process was statistically controlled. In phase II, there were out of control observations identified as a shift in the average process. The multivariate process capability measurement results obtained a 〖MC〗_pk value of 1.053, which means that the overall production of PCC cement complies with company regulations.
Co-Authors Agus Suharsono Ahsan, Muhammad Ahsan, Muhammad Amalia, Rahmatin Nur Anisa Nur Fadilah Ayub Samuel Yosepha Farady, M. Difa Haryono Haryono Haryono Haryono Haryono Haryono Haryono Haryono Hidayatul Khusna Hidayatul Khusna Inung Anggun Saputri Khusna, Hidayatul Loka, I Melda Puspita Luluk Mukarromah muhammad mashuri Muhammad Salam Taufiqi Nanda Eka Putri R Noorahma Ayuning Tyas Puspita Permatasari Qulsum Dwi Anggraini Ramadhani Etika Wulandari Sigit Budiantono Sri Mumpuni Retnaningsih Suhermi, Novri Wibawati Wibawati Wibawati Wibawati Wibawati Wibawati Wiwiek Setya Winahju Zuyyin Inesa Pratiwi