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All Journal SPEKTRUM INDUSTRI TEKMAPRO Journal of Industrial Engineering and Management Inspiratif Pendidikan OPERATION EXCELLENCE: Journal of Applied Industrial Engineering PROZIMA (Productivity, Optimization and Manufacturing System Engineering) Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Teknik Industri : Jurnal Hasil Penelitian dan Karya Ilmiah dalam Bidang Teknik Industri Metode : Jurnal Teknik Industri Jurnal Biologi Tropis Tibuana : Journal of Applied Industrial Engineering Industri Inovatif : Jurnal Teknik Industri Matrik : Jurnal Manajemen dan Teknik Industri Produksi Dedikasi: Jurnal Pengabdian Masyarakat Academia Open Jurnal Senopati : Sustainability, Ergonomics, Optimization, and Application of Industrial Engineering Indonesian Journal of Innovation Studies BIOMA : Jurnal Biologi dan Pembelajarannya Jurnal Pengabdian Masyarakat Akademisi PELS (Procedia of Engineering and Life Science) Takuana: Jurnal Pendidikan, Sains, dan Humaniora Jurnal Karya Abdi Masyarakat Journal of Fish Health Innovative Technologica: Methodical Research Journal JOTECHS IJOT Widya Teknik
Tedjo Sukmono
Universitas Muhammadiyah Sidoarjo
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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Markov Method Revolutionizes Paper Industry, Slashing Maintenance Costs Globally: Metode Markov Merevolusi Industri Kertas, Memangkas Biaya Pemeliharaan Secara Global Dikril Ilham Syaifullah; Tedjo Sukmono
Indonesian Journal of Innovation Studies Vol. 25 No. 4 (2024): October
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v25i4.1176

Abstract

Paper manufacturing industries rely on efficient machinery for production processes, yet neglecting maintenance can lead to substantial costs. This study addresses the maintenance cost optimization challenge in a Pasuruan paper company, where maintenance expenses exceed 20% of the standard. Utilizing the Markov chain method, the research identifies optimal paper machine maintenance costs, achieving a 32% cost reduction. By analyzing data from company documents and literature reviews, specific machine states are identified, recommending overhaul strategies to enhance operational efficiency. The study's implications underscore the method's effectiveness in reducing costs and improving productivity for paper manufacturing industries, offering valuable insights for similar sectors. Highlights: 1. Neglecting maintenance in paper manufacturing leads to substantial costs.2. Markov chain method optimizes paper machine maintenance, reducing expenses.3. Implementation of optimal maintenance strategies significantly enhances financial sustainability. Keywords: Paper manufacturing, Maintenance optimization, Markov chain method, Cost reduction, Operational efficiency.
EOQ Optimization Revolutionizes Inventory Management, Delivering Cost Savings Globally: Optimalisasi EOQ Merevolusi Manajemen Inventaris, Menghasilkan Penghematan Biaya Secara Global Devira Kusuma Wardhani; Tedjo Sukmono
Indonesian Journal of Innovation Studies Vol. 25 No. 4 (2024): October
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v25i4.1177

Abstract

Efficient inventory management is crucial for companies to minimize costs while ensuring adequate supply to meet demand. PT Samawa Tirta Alam, a bottled sweet drinking water company, faces significant inventory management issues, notably with refined sugar raw materials. High transportation costs and fluctuating demand contribute to excessive inventory accumulation and increased storage costs, necessitating an optimization strategy. This study implements the Economic Order Quantity (EOQ) method to address these challenges. Through a mixed-method approach, qualitative data were gathered via observations and interviews, while quantitative analysis utilized historical data to calculate optimal order quantities, frequencies, safety stock levels, and reorder points. Results demonstrate substantial cost savings, with optimal order quantities determined, reducing order frequencies from 12 to 2 times per year, and minimizing safety stock levels. The findings underscore the effectiveness of the EOQ method in enhancing cost-effectiveness and operational performance in raw material inventory management for similar companies. Highlights: 1. Cost Efficiency: EOQ method reduces total inventory costs effectively.2. Operational Precision: Minimizing safety stock enhances operational efficiency.3. Strategic Insight: Integrated approach provides practical solutions for inventory management challenges. Keywords: Inventory Management, Economic Order Quantity (EOQ), Cost Optimization, Raw Materials, Transportation Costs
Markov Chains Slash Inventory Costs in Indonesia: Rantai Markov Memangkas Biaya Persediaan di Indonesia Adinda Chamilia Mishani; Tedjo Sukmono
Indonesian Journal of Innovation Studies Vol. 25 No. 4 (2024): October
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v25i4.1184

Abstract

PT. Varia Usaha Beton, facing an 8% decline in 2022 targets due to uncontrolled inventory and a 15,150-ton overstock of sand at its BSP Sayung plant, needed an effective solution. This study applied a Markov chain model with perfect enumeration to optimize sand inventory management. Qualitative data from observations, expert interviews, and company records (2021-2022) and quantitative analysis identified Policy 58 as optimal, reducing excess costs to Rp. 32,463,360 monthly. Implementing improvements in specific overstock states (3, 4, 5, and 6) provides a strategic approach to minimize sand overstock and associated costs. Highlight: Inventory Decline: 8% target drop due to uncontrolled inventory in 2022. Optimal Policy: Policy 58 reduced monthly excess costs to Rp. 32,463,360. Strategic Improvements: Implement changes in states 3, 4, 5, and 6 to manage overstock. Keywoard: Inventory Control, Markov Chain, Perfect Enumeration, Overstock Management, Construction Materials
Implementation of Nawaz, Enscore, and Ham (NEH) for Minimize Makespan in Job Shop Scheduling Adistyas Nastiti, Octavia; Sukmono, Tedjo
International Journal on Orange Technologies Vol. 7 No. 2 (2025): International Journal on Orange Technologies (IJOT)
Publisher : Research Parks Publishing LLC

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31149/ijot.v7i2.5438

Abstract

OPQ is a company that specializes in providing construction materials such as ready-mix concrete, precast concrete, concrete bricks and crushed stone. With 4 different compositions and high demand, it is not uncommon for problems to occur, namely late delivery. This research aims to increase work efficiency by minimizing makespan to reduce idle time which will impact delays in product delivery to customers. The results of production scheduling using the NEH method produce smaller makespan results and faster production process completion times compared to the scheduling method used by the company. The NEH method produces a makespan of 2.29 with the job sequence P3-P4-P2-P1. The method used by the company obtained a makespan of 3.01 with a partial work sequence of P2-P3-P4-P1. This can prove that the calculation results using the NEH method can minimize makespan and this method can be used by companies as a reference for scheduling the production process to overcome the problems being faced by the company.
Tractor Paint Quality Control By Integrating The Six Sigma Method And Fail Mode And Effect Analysis (FMEA) PT. XYZ Wahyu Setiawan, Ardhi; Sulistiyowati, Wiwik; Bamban Jakaria, Ribangun; Sukmono, Tedjo
International Journal on Orange Technologies Vol. 7 No. 3 (2025): International Journal on Orange Technologies (IJOT)
Publisher : Research Parks Publishing LLC

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31149/ijot.v7i3.5439

Abstract

XYZ is a company engaged in assembling agricultural machinery, namely four-wheeled tractors. The components of the four-wheeled tractor itself consist of the front wheels, rear wheels, engine, engine cover, chassis/frame, steering floor, steering seat, fenders, pedals and roof. For parts that will be assembled, the painting process is carried out within the company itself. Therefore, during the painting process, several problems arise, namely differences in color, paint thickness and paint strength. The painting process at this company has not yet reached zero defects, because several defects were still found in the fenders, floor (steering floor), and engine cover. Situations like this can result in increased production costs and decreased product quality, which ultimately reduces profitability. The aim of this research is to find out the main factors that cause defects in painting parts and make appropriate suggestions/improvements to reduce and prevent defects in the painting process. The method used is the Six Sigma method and the FMEA (Failure Mode Effect and Analysis) method. Six Sigma in technical methods is oriented towards a statistical approach to calculating product defects. The goal is to reduce process variance by eliminating defects that interfere with customer satisfaction. FMEA is a technical analysis which, if carried out correctly and at the right time, will provide great value in helping the decision making process. The research results show that the average DPMO value for tractor product production on weekdays from January 1 2023 to April 30 2023 is 107618.46 with an average sigma value of 2.74. The recommendation for improvement from the FMEA method is that the cause of the defect with the highest RPN value is painting that does not comply with the SOP of 576. The proposed improvement for the cause of this defect is supervision of painting employees.
Ethnozoological Study of Malay Tribal Communities in Mersam Village, Batanghari District Putri, Andini Faizatul; Sukmono, Tedjo; Nugraha, Anggit Prima
Jurnal Biologi Tropis Vol. 25 No. 2 (2025): April-Juni
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i2.8594

Abstract

Mersam Village is located in Mersam District, Batanghari Regency, and has many local wisdoms that are still preserved to this day. The Malay tribe, as the indigenous group, is the primary source of local wisdom in this village. This study aims to identify the species of animals used, describe traditional practices, outline community knowledge, and analyze the reasons why the community continues to maintain these utilization activities. The research method employed is a qualitative descriptive approach, which includes stages of preliminary surveys, interviews, participatory and non-participatory observations, and documentation. The selection of informants used purposive sampling techniques for key informants and snowball sampling techniques for general informants. Documentation and identification of samples were conducted in the field. The results of this study indicate that ethnozoology in Mersam Village utilizes 32 animals species. Ethnozoology in Mersam Village related to consumption utilizes five species, which include customary meanings and unique processing methods. Ethnozoology in Mersam Village in terms of medicine utilizes 17 species, based on hereditary knowledge through treatments provided by shamans. Ethnozoology in Mersam Village as a customary tradition utilizes five species, including practices that are only carried out in Mersam Village and must adhere to customary norms. Ethnozoology in Mersam Village as a sign or symbol utilizes 18 species, which are believed to represent good or bad omens. Additionally, there are 11 customary traditions that utilize animals.
Analysis of Flour Inventory Control Strategy as Raw Material for Shrimp Crackers Using Markov Chain Sukmono, Tedjo; Hartanti, Lusia Permata Sari; Murnawan, Hery; Jamaluddin, Jamaluddin
Widya Teknik Vol. 24 No. 2 (2025): November
Publisher : Fakultas Teknik, Universitas Katolik Widya Mandala Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/wt.v24i2.6132

Abstract

Abstract: One of the important challenges the industry faces is the problem of raw material inventory, so good inventory management is essential. This management results in the emergence of inventory costs comparable to the company's operational costs. Inventory deviations in an industry can be in the form of less or more inventory caused by inaccurate inventory calculations, such as those experienced by PT SLU. The condition of PT SLU shows that the products produced have decreased while raw materials have an excess inventory of more than 15,000 kg. This study aims to determine the quantity of flour raw materials to achieve optimal inventory costs at PT SLU. The method used is the Markov chain and enumeration method to determine the optimal amount of raw materials to reduce costs. The research findings indicate that policy 58 yields the lowest expected cost of Rp. 32,463,360 compared to other policies. Therefore, it is suggested that improvements be implemented, such as if the system is in states 3, 4, 5, or 6, for long-term policy. This condition can help companies create strategies to reduce overstock, particularly of raw flour materials.
Observasi Biodiversitas Burung dan Habitatnya di Kawasan Cagar Budaya Nasional (KCBN) Candi Muaro Jambi Afrilia, Riska; Khairatinisa, Khairatinisa; Sukmono, Tedjo; Salsabila, Nisrina; Hadian, Mohammad Ekki
Takuana: Jurnal Pendidikan, Sains, dan Humaniora Vol. 4 No. 3 (2025): Takuana (October-December)
Publisher : MAN 4 Kota Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56113/takuana.v4i3.162

Abstract

Birds play an important role in ecosystem as pollinators and seed dispersers, so avian diversity can serve as an indicator of environmental quality. This study was at Muaro Jambi Temple, a National Cultural Heritage Area (KCBN), and began with a presentation on observation techniques, field identification, and understanding of ecological characteristics. The survey was conducted in two observation zones, namely the core zone and the buffer zone, using the point count method. Observers stood at specific points within the habitat and recorded bird sightings during defined time periods. Observations were conducted for one week in August 2025, from 6:00 a.m. to 9:00 a.m. and 3:00 p.m. to 6:00 p.m. The study recorded 79 species comprising a total of 327 individual birds. The Shannon-Wiener diversity index (H’) of 3.75 indicates a very high level of diversity in the area. Several species found are protected, including frugivorous and pollinating birds. Based on the IUCN Red List, identified species include the Java Sparrow (Vulnerable), the Ciblek/Perenjak (Near Threatened), and a numerous other species categorized as Least Concern. These findings emphasize the importance of conservation efforts at KCBN Muaro Jambi to preserve habitats and maintain the ecological function of birds.
Co-Authors Abdul Rohman Abdul Rohman Adinda Chamilia Mishani Adistyas Nastiti, Octavia Afrilia, Riska Ahmad Fikri Ardianto Alfian Fajar Gunawan Ali Sadikin Amatullah, Dhiny Ari Rio De Setiawan Asni Johari Atikha Sidhi Cahyana Atikha Sidhi Cahyana Boy Isma Putra Dawam Suprayogi Devira Kusuma Wardhani Dewi Nur Atika Dikril Ilham Syaifullah Diwanti Faradiba, Nabila Dristiana, Fila Dwi Kakung Saputro Dzati Fauziyah Erwin Widiantono Fajar Dwi Mauli Fila Dristiana Fitrah Cornellya Angela Gusti Nurina Azhariani Hadian, Mohammad Ekki Hafizah, Mutia Hana Catur Wahyuni Harlis Harlis Hartanti, Lusia Permata Sari Hery Murnawan, Hery Ihsan, Mahya Indah Apriliana Sari Indah Apriliana Sari W Indah Apriliana Sari Wulandari Jamaluddin Jamaluddin Khairatinisa, Khairatinisa Krisna Risky Putra Irawan Leksono, Rudy Bowo Lely Lindyawati M.Haris Efendi Hsb Marodiyah, Inggit Meisya Azzahra Rachman Mochammad Imam Mashuri Mohammad Buchori Much Syafiudin Muhammad Arizki Zainul Ramadhan Muhammad Dio Dwi Septian Mukhammad Surya Lesmana Muswita Muswita Nafis Khumaidah Natalia, Desfaur Novi Prastyanda Putra Pratama Nugraha, A. Prima Nugroho, Dizsa Arliansyah Nurma M. Hidayatulloh Octavia Adistyas Nastiti Putra, Tri Syukria Putri, Andini Faizatul Putri, Melinda Aprilia Radiana Atika Sari Rasyid, Mohammad Andi Ribangun Bamban Jakaria Rizky Janatul Magwa Rudy Bowo Leksono Salsabila, Nisrina Sanjaya, Muhammad Erick Saputra, Nur Qomaruddin Sari Wulandari, Indah Apriliana Sigit Wahono sisiliani, fitria trisna Suhadak Tia Wulandari Upik Yelianti Utomo, Pradita Eko Prasetyo Varid Jainuri Wahono, Sigit Wahyu Nugroho Wahyu Setiawan, Ardhi Wijatmiko, Erie Fadma Noer Fitriana Winda Dwi Kartika, Winda Dwi Wiwik Puji Lestari Wiwik Sulistiyowati Wulandari, Indah Apriliana Sari Yoppie Wulanda Yusuf Effri Prastyo Budi Zahara Sofillauny