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All Journal Jurnal technoscientia Jurnal Rekavasi Prosiding Semnastek PERFORMA : Media Ilmiah Teknik Industri Jurnal Teknik Industri Terintegrasi (JUTIN) Reswara: Jurnal Pengabdian Kepada Masyarakat JURNAL TEKNOLOGI TECHNOSCIENTIA Pilar Teknologi : Jurnal Penelitian Ilmu-ilmu Teknik Industrika : Jurnal Ilmiah Teknik Industri JagoMIPA: Jurnal Pendidikan Matematika dan IPA Journal of Industial Engineering and Technology KARYA: Jurnal Pengabdian Kepada Masyarakat Dharma: Jurnal Pengabdian Masyarakat Polinomial : Jurnal Pendidikan Matematika Jurnal Sains dan Aplikasi Keilmuan Teknik Industri Prosiding Seminar Nasional Teknik Industri Scientica: Jurnal Ilmiah Sains dan Teknologi Spektrum Industri
Khoiri, Halwa Annisa
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Eksplorasi Etnomatematika Pada Benteng “Van Den Bosch” Ngawi Susanto, Doni; Untari, Erny; Khoiri, Halwa Annisa
Polinomial : Jurnal Pendidikan Matematika Vol. 5 No. 1 (2026)
Publisher : Papanda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56916/jp.v5i1.3044

Abstract

Mathematics is often regarded as a discipline detached from social and cultural contexts, even though the development of mathematical concepts is inherently connected to human experiences in understanding space, form, and everyday needs. Ethnomathematics emerges as a perspective that highlights this interrelationship by positioning mathematical practices as an integral part of culture. This study aims to examine the application of mathematical concepts found in Van den Bosch Fort in Ngawi, a nineteenth-century colonial structure built by the Dutch for defense purposes and for monitoring strategic routes at the confluence of the Bengawan Solo and Madiun rivers. Employing a qualitative approach with an ethnographic method, this research conducted direct observations of the building’s structure, interviews with local informants, and visual documentation to identify mathematical elements embedded within the fort’s architectural features. The data analysis techniques used were data collection, data presentation and drawing conclusions. The findings reveal that various concepts of plane and solid geometry are represented through the shapes of the gateways, doors, windows, guard posts, and supporting pillars, which include squares, rectangles, equilateral triangles, right triangles, semicircles, and cylinders. These results demonstrate that colonial architecture was not solely designed based on strategic or military considerations, but also incorporated systematic mathematical principles. In addition to providing theoretical contributions to ethnomathematics studies, this research holds practical implications for the development of culture-based mathematics learning. By utilizing historical buildings as learning resources, students are expected to gain a more contextual and meaningful understanding of mathematics while cultivating an appreciation for the historical and local values embodied in Van den Bosch Fort.
Analisis Pengendalian Kualitas Pada Proses Coating di PT ABC dengan Pendekatan Statistical Quality Control (SQC) dan FMEA Khoiri, Halwa Annisa; Aryani, Wilis Herlin
Jurnal Sains dan Aplikasi Keilmuan Teknik Industri (SAKTI) Vol. 5 No. 02 (2025): December 2025
Publisher : Teknik Industri Universitas Ma Chung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33479/sakti.v5i02.186

Abstract

PT ABC is a manufacturing company operating in the construction and fabrication sector. One of the projects currently undertaken by PT ABC is the manufacture of 12 sets of off-screen bars. In this process, the coating stage shows a high defect rate, accounting for 35.1% of total defects. This study aims to analyze the quality control process at the coating stage using Statistical Quality Control (SQC) and Failure Mode and Effects Analysis (FMEA). The SQC tools applied include control charts, Pareto diagrams, and fishbone diagrams. SQC is used to identify dominant defect types and their contributing factors, followed by FMEA to determine risk priorities using the Risk Priority Number (RPN) approach. The integration of these two methods provides a comprehensive framework for quality improvement. The results show that the two dominant defects are mottling and dust spray. Based on the RPN calculations, the highest RPN value is 280, caused by inconsistent spraying at corner areas leading to mottling defects. This is followed by excessive spraying distance in dust spray defects with an RPN of 252. Other significant causes are related to human factors, namely operators failing to clean the workpiece surface in dust spray defects and lack of operator attentiveness in mottling defects, both with an RPN value of 210. Based on these findings, several improvement recommendations are proposed, including operator retraining, standardization of spraying distance and angle, and the implementation of surface cleaning procedures prior to the coating process.
Penerapan Total Productive Maintenance (TPM) Menggunkan Metode Overall Equipment Effectiveness (OEE) pada Kinerja Mesin Thermofix Fauzia, Salsa Billa; Hendrawan, Aloysius Tommy; Khoiri, Halwa Annisa
Industrika : Jurnal Ilmiah Teknik Industri Vol. 10 No. 2 (2026): Industrika: Jurnal Ilmiah Teknik Industri
Publisher : Fakultas Teknik Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/4t86a288

Abstract

The PT. XYZ is a manufacturing company engaged in the textile industry. In recent years, there have been issues with production smoothness, one of which is the thermoflux machine frequently experiencing downtime, disrupting production flow. This research aims to analyse the Overall Equipment Effectiveness (OEE) value, identify loss factors based on the Six Big Losses, and identify the root causes of the problems. Based on the analysis conducted, an Availability Rate of 57% was obtained, a Performance Rate of 61.18%, a Quality Rate of 89.57%, and an OEE value of 30.68%. From the Six Big Losses identification results, the highest type of loss obtained is Reduce Speed Losses. Proposals for improving Autonomous Maintenance include daily checklists and routine cleaning. Planned Maintenance involves a maintenance schedule twice a month and monitoring runtime. Quality Maintenance adjusts machine parameters to meet standards. Focused Improvement is carried out through evaluations and inspection checksheets. Training and Education include monthly training, while Safety, Health and Environment ensures the use of PPE in accordance with SOP.. Keywords: Overall Equipment Effectiveness (OEE), Six Big Losses, Thermofix Machine, Total Productive Maintenance (TPM).
Pengendalian Kualitas Menggunakan Metode Statistical Quality Control (SQC) pada Kain Teteron Rayon di PT. ABC Batista, Syifa Dida; Hendrawan, Aloysius Tommy; Khoiri, Halwa Annisa
Industrika : Jurnal Ilmiah Teknik Industri Vol. 10 No. 2 (2026): Industrika: Jurnal Ilmiah Teknik Industri
Publisher : Fakultas Teknik Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/aekgsx24

Abstract

Abstract PT ABC is one of the companies in the textile industry (clothing) with dyeing, printing, and finishing units located in the Karanganyar area. This study aims to analyze quality control in the Teteron Rayon fabric dyeing production process at PT. ABC using the Statistical Quality Control (SQC) method. This method involves several statistical tools, namely histograms, Pareto diagrams, P-Chart analysis, and fishbone diagrams. Based on the results of the histogram analysis of defect data over a 12-month period, it was found that the highest defect rate occurred in March 2025 at 20,776 yards. The results of the Pareto analysis showed that the most dominant type of defect was streaks, with a total of 36,602 yards or 19% of the total defects. The p-chart analysis revealed that most of the production results were outside the control limits, with only one production period (February 2025) being within the statistical control limits. Meanwhile, fishbone analysis shows that the main causes of striped defects include lack of operator training, low understanding of grey fabric quality, suboptimal machine maintenance, work methods that do not comply with SOP, and weak supervision of the production process. With this, the company is advised to improve workforce training, improve maintenance systems, and tighten operational supervision to reduce the number of defects and improve product quality. Keywords: Defect Dyeing, Fishbone, Kain Teteron Rayon, P-Chart, Pareto Diagram Statistical Quality Control.
Implementasi Six-Sigma pada Produksi Kain Rayon Lebar PT XYZ Khoiri, Halwa Annisa; Kusuma, Yudha Adi; Aryaningtyas, Fanny Diantina
Performa: Media Ilmiah Teknik Industri Vol 23, No 2 (2024): Performa: Media Ilmiah Teknik Industri
Publisher : Industrial Engineering, Faculty of Engineering, Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/performa.23.2.85010

Abstract

PT XYZ is a textile industry company whose products are wide rayon fabric. In the production period from January 2022 to April 2023, the number of fabric produced was 2,347,646 yards and defect fabric was 333,136 or 14.2%. In the production process, this value exceeds the control limit so a lot of fabric has to be reprocessed. The sigma value of the current production process is 3.172, meaning that system improvements need to reduce the number of defective products. This research aims to minimize product defects using the Six Sigma method. The Six Sigma stages in this research are the define stage to identify types of defects and it was found that there were 18 types of defects, the measure stage to determine the largest percentage of defects and calculate the sigma value, the analyze stage to find out the root cause of defects using a fishbone diagram, the improve stage to formulate proposed improvements using the 5W+1H approach, and the control stage to supervise the implementation of proposed improvements using the Poka Yoke method. The proposed improvements based on the 5W+1H method and the Poka Yoke method are cleaning machines in a row and carried out on a scheduled basis, rescheduling the number of workers per shift to reduce worker negligence, scheduling machine repairs, providing regular training to workers, and adding lighting in the room. production. After implementing this proposed improvement, it is hoped that can increase the sigma value of the production process carried out.
Co-Authors Achmad, Amin Yazid Amarullah, Muhammad Saif Aryani, Wilis Herlin Aryaningtyas, Fanny Diantina Astuti, Indra Puji AVANDY, DICY SEFTIAN Azhari, Zahrul Batista, Syifa Dida Cahyaningtyas, Putri Doni Susanto, Doni Elyuda, Dika Restu Erny Untari, Erny Fandidarma, Bayu Fauzia, Salsa Billa Hendarawan, Aloysius Tommy Hendrawan, Aloysius Tommy Isnaini, Wildanul Jurjani, Aladdin Hidayatullah Kurnia, Reza Fitra Mumtaha, Hani Atun Muttaqin, Aan Zainal Nita, Sekreningsih Pratama, Heru Andi Wardana, Bima Triaji Yudha Adi Kusuma