JURNAL SURYA TEKNIKA

Identifikasi Tingkat Risiko Kecelakaan Kerja Menggunakan Metode HIRARC

Mohamad Nur Yorisyah, Marulan Andivas, Alex Kisanjani, Wahyu Ismail Kurnia — Sat, 07 Jun 2025 00:00:00 +0700

The rapidly growing manufacturing and service industries require various companies to improve operational efficiency, including in maintaining occupational safety and health (K3). CV. XYZ is a company that produces liquid organic fertilizer, granule biofertilizer, and vegetable pesticides. This research aims to identify potential hazards, analyze the level of risk of work accidents, and provide risk control recommendations using the HIRARC (Hazard Identification, Risk Assessment, and Risk Control) method. The results show that the potential risks vary from low to high levels. The two highest risks are electrical accidents during machine maintenance and injuries from falls during waste transfer. Control recommendations include the use of personal protective equipment (PPE), strict implementation of safety procedures, improvement of work facilities, and provision of assistive devices. This research provides important guidance for companies in effectively managing occupational accident risks and creating a safer work environment.

Pengaruh Kepuasan Petani Ubi Terhadap Harga dan Pelayanan di Pabrik

Widi Astutik, Nurwindy Yanasim, Erniyani Erniyani — Mon, 09 Jun 2025 00:00:00 +0700

Penelitian ini bertujuan untuk menganalisis pengaruh harga dan pelayanan terhadap kepuasan petani ubi jalar yang bermitra dengan pabrik pengolahan PT. ABC di Kabupaten Gowa. Metode yang digunakan adalah pendekatan kuantitatif dengan teknik pengumpulan data melalui kuesioner dan wawancara. Sampel diambil secara jenuh dari seluruh populasi petani mitra. Hasil analisis regresi menunjukkan bahwa harga berpengaruh signifikan terhadap kepuasan petani, sementara pelayanan tidak memberikan pengaruh yang signifikan secara parsial. Nilai koefisien determinasi sebesar 62% menunjukkan bahwa harga dan pelayanan secara bersama-sama menjelaskan sebagian besar variasi kepuasan petani. Temuan ini menegaskan pentingnya kebijakan penetapan harga yang adil untuk meningkatkan loyalitas dan keberlanjutan kemitraan antara petani dan pabrik pengolahan.

Evaluasi Penjadwalan Proyek Produksi Conveyor Table Top Chain pada CV. XYZ dengan Pendekatan CPM

Erwin Saputro, Siti Muhimatul Khoiroh — Thu, 26 Jun 2025 00:00:00 +0700

This study evaluates the effectiveness of project scheduling for conveyor table top chain production at CV. XYZ using Critical Path Method (CPM). The study was motivated by frequent project delays in 2024, causing late deliveries and cost overruns. CPM identified the critical path as activities A–B–C–E–F–G–H–I–J–K–L–M–N, with one activity (Incoming Check Material) having slack. CPM estimated the project duration at 127 days of on-time completion. The findings show that CPM methode significantly improves time efficiency in project execution.

Perancangan Ergonomic Automix-Liquid Soap dan Kelayakan Investasi Guna Meningkatkan Kapasitas Produksi di PT. SKI

Dian Rahma Aulia, Handy Febri Satoto — Thu, 26 Jun 2025 00:00:00 +0700

PT. SKI produces GoClink liquid soap but faces challenges in detergent production, especially during mixing, which uses a semi-automatic tool. Mixing and stirring take about 43 minutes for 80 liters per day, done by 2 operators with poor ergonomic posture (REBA score 10). This study designs an automatic mixer (Automix-Liquid Soap) based on anthropometry and ergonomics to boost capacity, speed up production, and reduce operator workload. Methods include field observation, Stopwatch Time Study, REBA evaluation, design based on anthropometric data from 5 workers, and investment feasibility analysis using Net Present Value (NPV). Results show mixing time improved by 71.2%, cutting 184.54 seconds (from 259.14 to 74.60 seconds), and stirring time improved by 71.3%, reducing 1,667.34 seconds (from 2,338.2 to 670.86 seconds). Capacity rose to 180 liters, REBA score improved to 2, and labor efficiency increased by 50%. An investment of Rp10,589,625 is financially viable with a positive NPV of Rp20,372,845.

Kekuatan Lentur dan Kekuatan Impak Komposit Matrik Epoxy Berpenguat Serat Sisal (Agave Sisalana) Menggunakan Metode Vacuum Bagging

Angga Asrian, Putri Nawangsari, Warman Fatra, Dedy Masnur — Fri, 27 Jun 2025 00:00:00 +0700

Agave Sisalana is widely grown in the Bukit Bulek area, West Sumatra Province. The Sisal leaf fiber is traditionally utilized by the Bukit Bulek community as a rope material. This indicates it has a great potential to be developed as a composite reinforcement material. This research aims to characterize the flexural and impact strength of Sisal leaf fiber as reinforcement in epoxy matrix composites by varying the fiber volume fractions, 30%, 35%, 40%, and 45% with a 0°/90° fiber orientation laminate. The 20 cm long of fibers and treated with 5% NaOH alkaline solution for 4 hours were employed. The composites were fabricated using the vacuum bagging method. Flexural and impact tests were conducted based on ASTM D-790 and ASTM D-6110 standards, respectively. The results show that the flexural strength increases from 45,20 to 49,67 MPa (maximum) as the fiber volume fraction increases from 30% to 35% fiber. Meanwhile, the impact strength increases as fiber volume fractions from 30% to 45% and reaches a maximum impact strength of 24.60 kJ/m².

Rancang Bangun Sistem Kontrol dan Monitoring Keamanan Sepeda Motor Berbasis IoT dengan Modul GPS Neo-6M dan Sensor Getar SW-420

Fernando Maesa, Hartono Hartono — Sat, 28 Jun 2025 00:00:00 +0700

Motorcycle security in Indonesia has become an important issue due to the high number of thefts, with 37,684 cases in November 2023, a sharp increase of 165% compared to the previous year. To address this issue, an Internet of Things (IoT)-based security system was developed that integrates the Neo-6M GPS module, SW-420 vibration sensor, and ESP32 WROOM microcontroller. The system enables real-time monitoring of vehicle position, suspicious activity detection, and instant notification delivery through a mobile application. The GPS module results have positioning accuracy with a margin of error of 24.78 meters in open space and 27.94 meters in closed space. While the vibration sensor is able to activate the horn automatically when the position of the vehicle is nudged and moved. The mobile application is designed to make it easier for users to monitor and control vehicles remotely. Based on the survey, 73.4% of users found the app easy to use, while 86.7% found the interface clear and informative. The system is expected to reduce the risk of motorcycle theft through an innovative, practical, and effective IoT solution.

Laju Korosi Baja Karbon Rendah Besi ASTM A36 dan Paku pada Lingkungan Perairan Manyar Gresik

Sonny Bambang Dianna, Vita Ambarwati, Lisa Puspita Ariyanto — Fri, 27 Jun 2025 00:00:00 +0700

This study aims to analyze the corrosion rate of low carbon steel in the coastal environment of Manyar District, Gresik Regency, by comparing the effects of seawater and river estuary water as well as deformation through different bending angles (45° and 90°). The weight loss method was used, with specimen immersion conducted for one month. The results showed that seawater, due to its high salinity, caused a significantly higher corrosion rate compared to estuary water. Low carbon steel specimens (M) were more susceptible to corrosion than nail specimens (P), likely due to differences in material composition and surface treatment. Additionally, deformation increased the corrosion rate due to stress concentration and micro-pooling at bent areas. This study offers a quantitative overview of steel degradation under real-world conditions and recommends additional protective measures, such as coatings or stress-minimizing designs. Further research is encouraged, including microscopic analysis and numerical simulations for more accurate prediction of material lifespan.

Identifikasi Parameter Modal Model Bangunan Dua Lantai Menggunakan Metode Covariance-driven Stochastic Subspace Identification

Adriyan Adriyan — Sat, 28 Jun 2025 00:00:00 +0700

The modal parameters identification is a crucial part for designing and monitoring of a structure. This research is aimed to identify natural frequency and damping ratio of a lab-scaled two-story building model as a structure-under-test (SUT). The identification applies an operational modal analysis (OMA) technique, leveraging an algorithm of covariance-driven stochastic subspace identification (SSI-Cov) within PyOMA2 libraries. The SUT is subjected to random excitations using pseudo random signals within 0.1-25 Hz frequency range. The acceleration responses were sampled at 7.5 ms rate for 1 minute at each floor. Consequently, two modes with frequencies 2.2384 Hz and 5.9220 Hz are successfully identified below 25 Hz. These two modes yield 0.0135 and 0.0069 of damping ratios, respectively. These findings are compared to those of other algorithms that demonstrated a satisfactory identification of natural frequencies. However, a significant difference emerges in the identified damping ratios, particularly with regard to the second mode.

Pembuatan Mesin Pencacah Rumput untuk Meminimalkan Biaya Pakan Ternak dan Meningkatkan Keuntungan pada UMKM Kalijaga Farm

Agung Chandra Syallom, Handy Febri Satoto — Sat, 28 Jun 2025 00:00:00 +0700

This study reveals the problem of feed waste in UMKM Kalijaga Farm where out of every 30 kg of feed bundles, 10 kg are not eaten. The grass chopper machine was designed using the QFD and Kano methods and the use of a gasoline engine as a driver was chosen because it is efficient and easy to maintain, suitable for remote locations without electricity, so it supports operations and increases farmer profits. The designed machine measures 80×50×100 cm, uses SKD-11 steel blades and thick iron plates for durability. Kano classification produces 2 must be attributes, 4 indifferent, 1 attractive, and 1 dimensional. For mobility, the machine is equipped with iron pipe handles on both sides and two bottom wheels. The HPP analysis shows a decrease in operational costs from IDR 115,100,000 to IDR 103,600,000, increasing the profit of UMKM Kalijaga Farm from IDR 29,400,000 to IDR 42,000,000.

Pengembangan Sistem Informasi di Sektor Konstruksi Menggunakan Pendekatan Rapid Application Development (RAD)

Sat, 28 Jun 2025 00:00:00 +0700

PT XYZ is a construction company specializing in planning and executing residential and commercial projects. To support project management, administration, and customer services, this study developed an information system using the Rapid Application Development (RAD) approach. RAD was selected for its advantage in accelerating system development through an iterative, user-focused process. The resulting system features online booking, project status tracking, and digital payment, designed to improve operational efficiency and service transparency. Evaluation results indicate that the system successfully integrates various functions, minimizes administrative errors, and expedites business processes. This implementation provides significant benefits for PT XYZ by enhancing service quality and competitiveness in the digital era.

Optimalisasi Rute Transportasi pada PT. ABC dengan Metode Nearest Neighbor

Rico Maharandi, Satriardi Satriardi, Rozar Rayendra — Sat, 28 Jun 2025 00:00:00 +0700

PT ABC is a company that provides logistics transportation services for the delivery of various products. PT ABC has a problem, namely that it does not have an optimal route for delivering products. This causes their operational costs to exceed the operational cost standards they set. The Nearest Neighbor method is a method of optimizing operational costs by looking for the shortest point connections to produce the shortest route. After implementing this method, there were route changes, namely for the Long 6 Wheel CDD unit from the initial route G-C1-C2-C3-C4-G it was changed to G-C1-C3-C2-G and for the 6 Wheel CDD unit from the initial route G -C1-C2-C3-C4-G is changed to G-C3-C4-G. Apart from that, there was a reduction in mileage after optimization, namely 269 Km. There is a reduction in operational costs, namely IDR 470,000.

Analisis Manajemen Risiko pada UMKM Kerupuk Adie Mandiri Menggunakan Metode HOR

Mon, 30 Jun 2025 00:00:00 +0700

The cracker industry is a growing food sector in Indonesia. UMKM Kerupuk Adie Mandiri in North Balikpapan produces onion crackers made from garlic. This study aims to analyze the risks in its production process using the House of Risk (HOR) method. This method helps identify, classify, and prioritize risks based on impact and probability. Business process identification was carried out using the SCOR approach and 19 risk events and 28 risk causes were found. With HOR 1 and the help of the Pareto diagram, 3 dominant risk causes were selected. A total of 13 mitigation strategies were formulated, and through HOR 2, strategies that were easy and dif icult to implement were determined. These results are expected to help UMKM in risk management and increasing operational ef iciency, and can be a reference for similar industries.

Analisis Status Mutu Air di Danau Toba Menggunakan Metode STORET

Sun, 29 Jun 2025 00:00:00 +0700

Lake Toba as the largest volcanic lake in Southeast Asia faces a serious threat in the form of water pollution due to the activities of Floating Net Cages (KJA). This study aims to evaluate the status of water quality in the waters of Lake Toba, especially in Tongging Village, Karo Regency. The evaluation was carried out using the STORET method approach. Water samples were taken at three different time conditions (before, during, and after feeding) at five strategic points representing KJA, around KJA, and river inlets. The results showed that the concentrations of phosphate and nitrate had exceeded the quality standards of PP No. 22 of 2021, reaching 0.072 mg/L and 9.950 mg/L, respectively. The highest STORET method score was -35, indicating severely polluted water conditions. These findings emphasize the need for sustainable fisheries management in Lake Toba.

Analisis Pengendalian Kualitas Produk Keripik Tempe di Batam Menggunakan Pendekatan Metode FMEA dan RCA

Arsyad Sumantika, Elsya Paskaria Loyda Tarigan , Bahariandi Aji Prasetyo — Sun, 29 Jun 2025 00:00:00 +0700

This study aims to analyze the quality control of tempeh chips products in Batam using the Failure Mode and Effect Analysis (FMEA) and Root Cause Analysis (RCA) approaches. Tempeh chips are processed food products that have significant economic value for MSMEs in Batam, but often face various challenges related to quality control. The research method used is a combined qualitative and quantitative approach with a sample of 3 MSMEs producing tempeh chips in Batam. The results of the study identified several major quality problems in the tempeh chips production process, including non-uniform thickness, damaged packaging, soft texture, imperfect packaging seals, and weight contents that do not match the label. Through the application of FMEA, this study calculates the Risk Priority Number (RPN) for each failure mode, identifying five critical problems with the highest RPN values. Furthermore, using RCA and 5-Why analysis so that the root cause of each problem can be identified based on human, machine, method, material, and environmental factors. Based on the results of the analysis, this study recommends a series of comprehensive quality control recommendations, including the development of Standard Operating Procedures (SOPs), quality monitoring systems, employee training programs, and the implementation of quality control checkpoints. This research provides a significant contribution to the development of the tempeh chips industry in Batam and can be a reference for similar research in other areas.

Analisis Efektivitas Mesin Pneumatic Crimping pada PT. Global Rising Technologies Perkasa

Nuradilah Nuradilah, Elsya Paskaria Loyda Tarigan — Sun, 29 Jun 2025 00:00:00 +0700

PT Global Rising Technologies Perkasa is a contractor engaged in the assembly of high-end wire and cable, as well as box build assembly for the automotive, semi-conductor and medical industries globally. One of the machines used, namely the pneumatic crimping machine, does not operate effectively in its production process. Continuous use of pneumatic crimping machines if not maintained properly causes damage and downtime to the machine. Downtime data that occurred on pneumatic crimping machines from July 2023 to June 2024 was 340 hours. The purpose of this study was to find the factors that cause pneumatic crimping machines to experience high downtime and find ways to reduce it. The analysis method used to measure machine effectiveness is overall equipment effectiveness (OEE), identifying the Six Big Losses using a Pareto diagram, and analyzing the main causes using a Fishbone Diagram. The results of this study show that the average OEE value of pneumatic crimping machines is 67%, far from the international standard of 85%, so it is considered low. The main factors causing high downtime are Equipment Failure Losses of 13% and Idling Minor Stoppages of 22%. There are two pillars of Total Productive Maintenance (TPM) used as a solution, Planned Maintenance and Autonomous Maintenance. With this implementation, the level of operational effectiveness will increase and downtime caused by damage to the pneumatic crimping machine will be reduced.

Pengukuran Waktu Kerja untuk Menentukan Jumlah Tenaga Kerja Optimal pada Pembuatan Neon Box

Muhammad Yunizar Arfiansyah, Herlina Herlina, Istantyo Yuwono — Sun, 29 Jun 2025 00:00:00 +0700

CV Wibisono Kreatif Media is a company engaged in the advertising industry (media advertising), construction, and general printing. CV. Wibisono Kreatif Media produces various products, ranging from neon boxes, flexible neon, embossed letters, sign boards, pylon totems, banner printing, sticker printing, and many more. CV Wibisono Kreatif Media also serves shipping and installation to all regions in Indonesia. The problem that arose was the production of CV Wibisono Kreatif Media neon boxes that did not meet the production target. Using the Time Study and Workload Analysis approach, the results showed the need for an efficient number of workers, which is only 5 workers; there will be 1 worker for the cutting operator, the number of workers for the lamp installation operator decreased from 2 to 1, the assembly operator for the neon box also reduced from 2 workers to 1 worker, then the framework making operator decreased from 2 workers to 1 worker, and finally, the sticker installation and finishing operator remains at 1 worker.

Penjadwalan Perawatan dan Optimalisasi Persediaan Sparepart Mesin Press Batu Tahan Api Guna Memitigasi Akibat Breakdown pada PT XYZ

Moh Romadhon Arizqi, Erni Puspanantasari Putri — Sun, 29 Jun 2025 00:00:00 +0700

PT Loka Refractories Wira Jatim is a refractory material manufacturing company for the cement, steel, power generation, and waste processing industries. In the last five months, there has been an increase in damage to the press machine, especially the stamp, disc, and moldbox components, which disrupts production and increases maintenance costs. To overcome this, the company optimizes the maintenance system and spare part management with the Total Productive Maintenance (TPM), Reliability-Centered Maintenance (RCM) and Time-Based Maintenance (TBM) approaches. MTTF and MTTR analysis are used to prepare a preventive maintenance schedule, where TBM is applied to components with predictable damage such as stamps, discs, and oil, while RCM is for gears and axles. TPM involves operators in daily maintenance. Spare part management uses the Reorder Point (ROP) method based on actual consumption and lead time, ensuring timely spare part availability without overstocking, and supporting production efficiency and sustainability.

Pengendalian Persediaan Sparepart Area Gudang Menggunakan Metode Continuous Review System (CRS) pada PT Indotruck Utama

Agus Mulyadi, St Nova Meirizha, Faradila Ananda Yul, Dear Rani Permata — Sun, 29 Jun 2025 00:00:00 +0700

PT Indotruck Utama is a company that supplies and distributes heavy equipment, including Volvo trucks and construction equipment. One of the main problems this company faces is overstocking in the warehouse, which can lead to additional storage space, increased inventory costs, and the risk of damage to goods. This research aims to optimize inventory management by controlling stock at an ideal level and comparing the current total inventory cost with the proposed price. In this study, the Continuous Review System method is applied by first grouping spare parts using the ABC method. This method categorizes inventory items based on the contribution of fund absorption, where category A items absorb the most significant funds, category B is intermediate, and category C has the most minor fund absorption. A total of 24 spare parts items were grouped into these three categories. Next, inventory requirements were forecasted using historical data to estimate the number of spare parts required in the future. Based on the forecasting results, estimated inventory requirements, optimal ordering point (Q*), reorder point, and safety stock were calculated for each item. The results showed that the current total inventory cost reached Rp 343,368,047.63, while with the implementation of the Continuous Review System, the cost can be reduced to Rp 333,425,336.79. Thus, there is a savings of Rp 9,942,710.84 or about 2.90%.

Optimalisasi Rute Distribusi pada Gudang YU Pet Shop Guna Meminimalkan Biaya Transportasi

Erwan Arif, Jaka Purnama — Sun, 29 Jun 2025 00:00:00 +0700

YU Pet Shop warehouse faces inefficiencies in the distribution of cat food, as delivery routes are manually determined by drivers without considering distance or vehicle capacity. This study aims to optimize distribution routes using the Ant Colony Optimization (ACO) method to reduce operational costs, particularly fuel and labor expenses. The results show that the total monthly travel distance can be reduced from 852 km to 661.6 km, achieving an efficiency gain of 22.34%. This reduction leads to monthly fuel savings of IDR 144,160 and labor cost savings of IDR 400,000. Therefore, the implementation of ACO has proven effective in improving distribution efficiency and significantly reducing transportation costs, thus supporting a more competitive and efficient company operation.

Analisis Pengendalian Kualitas Produk pada Gudang PT. DSV Solutions Indonesia (Semarang Site) Menggunakan Metode FMEA

Dwi Maudina Rahmawati, Denny Astrie Anggraini — Mon, 30 Jun 2025 00:00:00 +0700

PT. DSV Solutions Indonesia (Semarang Site) is a logistics company that provides storage and delivery services for PT. Semarang Autocomp Manufacturing Indonesia (SAMI). Between August and October 2024, several product defects were identified during the storage and delivery processes, including dented boxes, torn boxes, tangled wires, and peeled wires. These defects resulted in additional handling processes and had the potential to reduce customer trust. To analyze and address these issues, the Failure Mode and Effect Analysis (FMEA) method was applied to identify the root causes and effects of each defect, as well as to determine the priority for corrective actions. The analysis revealed that dented boxes had the highest Risk Priority Number (RPN) of 294, primarily caused by improper handling such as throwing packages. Meanwhile, tangled wires had an RPN of 252, attributed to poor material handling practices.

Techno-Economic Analysis of DME Production from Indonesian Brown Coal: A Preliminary Plant Design

Mon, 30 Jun 2025 00:00:00 +0700

This article presents the preliminary plant design and techno-economic assesment of Dimethyl Ether (DME) production from coal. As the world’s third largest coal producer, Indonesia faces challenges in using low rank lignite due to its high moisture content, wgich limits direct combustion efficiency. The plant was designed to produce 210,000 tons of DME per year, supporting national effort to reduce LPG imports and improve energy security. The calculation include mass and energy balances, equipment sizing, and enviromental considerations suh as CO2 emissions management. Economic evaluation demonstrate project feasibility, with an internal rate of return of 24.28%, a payback period of 3.46 years, and a net present value of 39.60 million USD. Sensitivity analysis shows profitability is highly sensitive to DME price variations. Further research issyngas recommended to develop effective carbon capture strategies and evaluate lifecycle emissions to enhance DME production more enviromentally friendly and sustainable.

Analisa Beban Kerja dan Studi Waktu Kerja Guna Optimalisasi Proses Produksi

Vi'ar Aprisa Putra, Handy Febri Satoto — Mon, 30 Jun 2025 00:00:00 +0700

This study aims to analyze workload and working time to optimize the production process. CV. XYZ is a small and medium enterprise that produces soy sauce. This company faces obstacles in meeting demand due to limited labor, manual production processes, and high workload and imbalanced distribution. Measuring the level of physical workload using the Cardiovascular Load (CVL) Method and energy consumption found fatigue in the boiling process, filling process and packaging process, while measuring standard time using the Work Sampling method produces a time of 112.42 seconds for each bottle. optimization Workload Analysis (WLA) recommended decreasing the number of labeling employees from 9 to 4 workers and raising the number of packing employees from 3 to 8 workers. The study comes to the conclusion that either more workers or longer workdays are needed to increase productivity. The goal of these suggestions is to promote sustainable production capacity.

Analisis Penjadwalan Proyek Produksi Kubah Masjid di UD. XYZ

Sani Zakiyah Maharani, Handy Febri Satoto — Mon, 30 Jun 2025 00:00:00 +0700

UD XYZ is experiencing delays in the construction of the mosque dome due to increased market demand and design complexity. Previously, the company used the bar chart method, which was less effective in depicting the relationships between activities and identifying the critical path. Therefore, this study proposes an alternative approach using the PERT and CPM methods to improve project scheduling efficiency. The analysis results show that the CPM method successfully identified the critical path in activities A-B-C-D-K-M-N-O-P. Meanwhile, the PERT method estimates the project to be completed in 73 days with a 50% probability, and 74 days with an 80% probability.

Analisis Waktu Kerja untuk Penentuan Kebutuhan Tenaga Kerja dalam Memenuhi Permintaan di CV. Barokah Metal Sidoarjo

Nayla Ayu Ramadhaniyah, Handy Febri Satoto — Mon, 30 Jun 2025 00:00:00 +0700

CV. Barokah Metal is a business engaged in the motorcycle spare parts manufacturing industry in the form of planers. Every day it is targeted to produce 60 dozen. However, sometimes consumer demand cannot be met. One of the reasons for not meeting the target is influenced by the performance and consistency of each worker, so it is necessary to determine the standard time using the stopwatch time study method in order to maximize workers in completing their work. After calculating, the standard time for operator 1 was 34.17 seconds, operator 2 33.89 seconds, operator 3 11.49 seconds, operator 4 38.96 seconds, operator 5 7.66 seconds, operator 6 46.40 seconds, operator 7 25.39 seconds, operator 8 33.17 seconds, and operator 9 60.45 seconds. The number of workers needed to meet the demand is 12 people, by adding 1 worker each for operator 4, operator 6 and operator 9.

Analisis Tingkat Kebisingan dan Upaya Pengendalian Kebisingan di PT. XYZ

Akbar Ghora Putra Ghora, Handy Febri Satoto — Mon, 30 Jun 2025 00:00:00 +0700

Noise is a major issue in industrial environments, including at PT. XYZ, which manufactures sack and woven bags. The production process involves machines that generate high noise levels, potentially causing hearing loss among workers. This study aims to analyze and map noise levels in the work area and recommend appropriate control measures. Data were collected using the grid lines method at 18 points with a Sound Level Meter and mapped using Golden Surfer software. Results show that several locations exceeded the 85 dB threshold set by the Ministry of Manpower, with the highest level of 99.1 dB found in the Circular Loom area. Risk analysis was conducted to evaluate health impacts, and noise control strategies were developed based on the hierarchy of controls, including elimination, substitution, engineering controls, administrative measures, and the use of personal protective equipment.

Rancangan Timbangan Digital dengan Alat Dimensi Otomatis Menggunakan Metode Kano

Siswanto Siswanto — Mon, 30 Jun 2025 00:00:00 +0700

Supply Chain Management (SCM) is a department of material & service provision at JOB Pertamina – Medco E&P Tomori Sulawesi. Data from each material has been entered into (SAP) such as material type, weight and material dimension size. To find out the dimensions of the incoming material, manual measurements are still carried out. Redesigning the digital bench scale by adding the function of measuring the dimensions of goods so that they can be displayed automatically via a liquid crystal display (LCD). The Kano method classifies the attributes of the digital bench scale by adding the function of measuring the dimensions of goods. From the results of the research on the redesign of the digital bench scale, 5 trials of the designed tool, there was a difference in the distance between manual and automatic measurements of around 0.2-1.5 cm which was caused by the HC-SR04 ultrasonic sensor which was not precise.

Relayout Fasilitas Produksi di UD. X Menggunakan Metode FTC dan Simulasi Diskrit untuk Efisiensi Material Handling

Rahma Adipura, Putu Eka Dewi Karunia Wati — Mon, 30 Jun 2025 00:00:00 +0700

Inefficient material handling can lead to increased production time, higher operational costs, and a greater risk of product damage. UD. X is a manufacturing company that produces motorcycle spare parts and is currently experiencing inefficiencies in its facility layout, resulting in suboptimal material flow. This study aims to redesign the facility layout to improve the efficiency of the material handling system. The methods used include the From-To Chart (FTC) for analyzing material movement between workstations, as well as discrete event simulation to evaluate the performance of layout alternatives. Data collected includes inter-departmental distances, frequency of material movement, process time, and total material travel distance. The results show that the proposed layouts successfully reduce material travel distance and handling costs. The best alternative achieved a total travel distance of 1080.05 meters and a material handling cost of Rp27,954.

Peningkatan Kesadaran Penggunaan Alat Pelindung Diri dengan Pendekatan Fishbone Diagram dan Kaizen dalam Industri Herbisida

Damar Wahyu Prianto — Sun, 29 Jun 2025 00:00:00 +0700

Weeds compete with crops for nutrients, reducing agricultural productivity. While herbicides are commonly used to control them, their production exposes workers to chemicals that may cause mild to severe skin irritation. To minimize this risk, increasing employee awareness of personal protective equipment (PPE), particularly latex gloves, is essential. A fishbone diagram was used to analyze the root causes of low PPE usage, and improvements were implemented using the Kaizen method. Facility access was identified as the primary contributing factor. Corrective actions included relocating glove supplies closer to workstations. Comparative analysis between 2023 (before intervention) and 2024 (after intervention) showed significant improvements: glove usage ratio increased from 0.81 to 1.05, the correlation coefficient rose from 0.38 to 0.75, and the p-value decreased from 0.219 to 0.013. These results indicate a statistically significant increase in PPE compliance. Facility-focused interventions using continuous improvement strategies can effectively enhance occupational safety awareness and behavior.

Analisis Kelayakan Investasi Mesin Pencetak Bola untuk Memenuhi Kebutuhan Pasar

Nanda Moh Surya Abdillah, Putu Eka Dewi Karunia Wati — Mon, 30 Jun 2025 00:00:00 +0700

UD. XYZ is facing increasing market demand for striped plastic ball variants but does not yet have a machine capable of producing the product. This study aims to evaluate the feasibility of investing in purchasing a small striped plastic ball molding machine as a strategic solution. A financial feasibility analysis was conducted using the Net Present Value (NPV), Internal Rate of Return (IRR), Benefit-Cost Ratio (BCR), and Payback Period (PP) methods. The evaluation results indicate that this investment is highly feasible, with a positive NPV of Rp144,594,680, an IRR of 68.48% (exceeding the benchmark interest rate of 10%), and a BCR of 1.295. The payback period is estimated to be only 1 year 5 months 12 days, indicating a fast and efficient return. The implementation of this machine is expected to increase production capacity, meet market demand, and strengthen the company's competitiveness and growth.

Rencana Keputusan Investasi Truk dengan Metode Capital Budgeting untuk Efisiensi Biaya Operasional

Raihan Dafa Rabbani, Herlina Herlina, Istantyo Yuwono — Sun, 29 Jun 2025 00:00:00 +0700

PT. XYZ has problems in supplying large amounts of activated carbon to large companies; so far the company still relies on third-party expedition services to rent trailer trucks for its deliveries. To address this issue, we conducted an investment feasibility analysis using the capital budgeting method for truck procurement. The results of the analysis show that investment in the UD Quester GDE280 Euro 5 truck is feasible. The payback period (PP) was recorded at 3.91 months, the net present value (NPV) was Rp9,581,482,520, and the internal rate of return (IRR) reached 40.66%, far exceeding the minimum attractive rate of return (MARR) of 8.53%. The Profitability Index (PI) was also positive at 13.28%, and operational cost efficiency showed potential savings of 33.31%. Based on these indicators, the investment in truck procurement is not only financially feasible but also able to significantly increase the company's operational efficiency.

Optimasi Waktu Setup Mesin Extruder dengan Single Minute Exchange of Dies dan Value Stream Mapping untuk mengurangi Waste Setup Delay

Muhammad Firdaus Al Amin — Mon, 30 Jun 2025 00:00:00 +0700

Amid intense competition in the manufacturing industry, production efficiency is crucial to improving productivity. PT. Manufacturing Sidoarjo, a CPP film producer, faces challenges with long setup times on the extruder machine, reaching up to 296 minutes, comprising 60 minutes for material preparation, 120 minutes for heating, and 60 minutes for trial runs. This issue increases operational costs and reduces competitiveness. The study applies the Single Minute Exchange of Dies (SMED) method to reduce setup time and Value Stream Mapping (VSM) to identify non-value-added activities. As a result, setup time was reduced to 193 minutes, achieving a 34.8% time efficiency, which enhances operational efficiency and production capacity.

Pemeliharaan Gardu Distribusi UTCA Tipe Cantol yang dilakukan Oleh PT. PLN Persero ULP Anyer

Jahra Damayanti, Mohammad Fatkhurrokhman — Mon, 30 Jun 2025 00:00:00 +0700

Distribution substation maintenance is an important measure to ensure the continuity of a reliable and safe electricity supply for consumers. This study focuses on the maintenance of cantilever-type distribution substations carried out by PT. PLN (Persero) ULP Anyer in Serang, Banten. This maintenance aims to prevent sudden equipment failures, ensure safety, and enhance the efficiency and durability of the electrical distribution system. The research method employed is qualitative descriptive, involving observation, interviews, and literature review conducted over one month, from July 1 to 31, 2024. The results of the study indicate that the cantilever-type distribution substation at PT. PLN (Persero) ULP Anyer is in good condition, with key components such as transformers, PHB-TR panels, and protective equipment well-maintained and functioning optimally. However, several areas requiring attention were identified, such as the installation of hazard signs and substation numbers to enhance safety and substation identification. Overall, the routine maintenance carried out has proven effective in maintaining the stability and reliability of the electricity distribution system.

Pengembangan Sensor Elektrokimia Berbasis Material Nano untuk Deteksi Ion Timbal (Pb²⁺) Menggunakan Sistem Elektronika Terintegrasi

Mon, 30 Jun 2025 00:00:00 +0700

Electrochemical sensors are a reliable method for detecting the presence of heavy metal ions such as lead (Pb²⁺) in aquatic environments. In this study, a sensor was developed based on a carbon paste electrode modified with ZnO nanomaterials and polyaniline, and integrated with a data acquisition system using a microcontroller. Voltammetric characterization results showed that the sensor could detect Pb²⁺ with high sensitivity at low concentrations. This system is expected to be applied for real-time and portable water quality monitoring.

Perancangan dan Pembuatan Mesin Mixer Adonan Guna Meminimalisir Tingkat Kelelahan Pekerja dengan Pendekatan REBA (Rapid Entire Body Asessment)

M Khoirul Anam, Handy Febri Satoto — Mon, 30 Jun 2025 00:00:00 +0700

This research was conducted at the UMKM (Micro, Small, and Medium Enterprise) Kerupuk Ayam Bawang Ibu Sunarti. The main issue identified was the inability to meet monthly customer demand due to the semi-automatic mixing process. To address this, a dough mixer machine was designed and developed using anthropometric and REBA (Rapid Entire Body Assessment) methods to improve productivity and reduce workor fatigue.The mixer has a capacity of 75 kg with dimensions of 85 x 85 x 100 cm, designed based on worker body measurements. It uses a double-sided fin blade made of thick stainless steel to ensure durability and hygiene. The machine produces up to 1,935 pieces of kerupuk per day and saves 5 minutes of processing time. Equipped with four wheels for mobility, the machine also lowers worker fatigue from a high to a moderate level based on REBA evaluation.

Optimasi Penjadwalan Produksi Menggunakan Metode Run Out Time

Mufid Ifam Mustasyar, Jaka Purnama — Mon, 30 Jun 2025 00:00:00 +0700

Effective production scheduling is essential to improve operational efficiency in manufacturing companies. This study analyzes the application of the Run Out Time (ROT) method in multi-product production scheduling at PT XYZ, which faces the challenges of demand fluctuations and high setup times. ROT is used to determine production priorities based on the ratio between inventory and average demand. Data for six months were analyzed including historical demand, production capacity, and operational time. As a result, the ROT method successfully reduced setup time and idle time, increased machine utilization, and reduced operational costs by Rp 75,500,000. Return on Investment (ROI) reached 196.08% with a Payback Period of two months. These findings prove that the ROT method is effective in optimizing scheduling, meeting demand on time, and preventing overproduction and underproduction. The application of ROT contributes to increasing the efficiency and competitiveness of PT XYZ in the competitive manufacturing market.

Analisis Redesain Fasilitas Produksi Departemen Pewarnaan Guna Meminimalisir Biaya Material Handling pada PT. Surya Pertiwi Nusantara

Arnoldus Ivan Bagus, Jaka Purnama — Mon, 30 Jun 2025 00:00:00 +0700

Factory layout is a facility design that aims to facilitate efficient material movement and optimal utilisation of production areas. PT. Surya Pertiwi Nusantara is a company engaged in the manufacture of sanitary ware. Based on observations in the colouring department, there are problems with the material transfer process, namely the distance between work stations is quite far, which has an impact on travel time. This results in wasteful material handling costs. Data processing was carried out using the From To Chart method and Activity Relationship Chart. The results of the research using the From To Chart method produced an alternative layout with a material handling moment of 7,814. 342.8 metres/month and OMH of Rp. 940,846,873.1/month, compared to the initial layout, which had a material handling moment of 18,334,175.2 metres/month and OMH of Rp. 1,078,049,501.8/month. Based on these results, the layout alternative using the From To Chart method was chosen.

Rancang Bangun Alat Pengkalis Adonan Kerupuk Krecek untuk Meningkatkan Kualitas Adonan dan Produktivitas pada UMKM Kerupuk Krecek di Nganjuk

Mohammad Ilham Kurniwan, Handy Febri Satoto — Mon, 30 Jun 2025 00:00:00 +0700

MSMEs Kerupuk Krecek Pak Sholeh in Kediri produces starch crackers with a Make To Stock system and distribution to Madiun, Magetan, and Tulungagung. Production reaches 3750 kg per month, but is constrained by the dough rolling process which still uses a simple multifunction machine. This machine is not specifically designed, so it produces inconsistent dough, extends production time, and reduces product quality. To overcome this, a special dough rolling machine was designed based on ergonomics, productivity, and anthropometry approaches. This machine uses a stable drive motor that produces dough that is elastic, smooth, and even without lumps. Kneading time is also reduced from 30-40 minutes to only 15-20 minutes. In addition to increasing efficiency, the design of the container and roll minimizes material loss and makes cleaning easier. This machine is able to improve the quality, process efficiency, and productivity of MSMEs Kerupuk Krecek as a whole.

Analisis Jumlah Tenaga Kerja Optimal pada Proses Pengolahan Pisang Cavendish Guna Memenuhi Target Permintaan

Fauzan Rizky Hidayat, Herlina Herlina — Mon, 30 Jun 2025 00:00:00 +0700

This study was conducted to determine the optimal number of workers in the Cavendish banana processing process at UD Queen Fruits, Mojokerto. The Stopwatch Time Study and Workload Analysis (WLA) methods were used to measure standard time and workload in each work center. The results showed that work center 3 (sorting and weighing) experienced the highest workload, with an average time of 160.84 seconds, while other work centers were much lower. This imbalance caused production delays and unfulfilled demand, especially for Queen Fruits products. WLA analysis showed that the ideal number of workers in work center 3 is two people, not one as is currently the case. Optimization through additional workers and workflow adjustments succeeded in increasing production capacity from an average of 44-47 boxes per day to 60 boxes. These findings indicate that work efficiency can be significantly improved through proper workforce planning.

Briket Ramah Lingkungan Berbasis Limbah Organik: Integrasi Kertas Bekas Sebagai Perekat pada Limbah Pertanian

Mon, 30 Jun 2025 00:00:00 +0700

One of the solid wastes from oil palm is the frond, which can be utilized to produce briquettes an alternative fuel. This study investigates the utilization of oil palm frond waste and sugarcane bagasse for briquette production, using different binders like tapioca flour and pulp at concentrations of 3%, 5%, and 8%. The research methodology involved comparing the moisture content, ash content, and calorific value of each treatment applied. The results showed that briquettes with 3% tapioka flour binder produced the best quality, with a moisture content of 3.6%, ash content of 4.4%, and a calorific value above 6,000 cal/g, meeting the quality standards of SNI 01-6235-2000. The implications of these findings indicate the potential of biomass briquettes as an environmentally friendly alternative energy source. However, this study was limited to laboratory testing without application trials or economic analysis. Further research is recommended to evaluate production scale and economic feasibility.

Analisis Kebutuhan Tenaga Kerja Untuk Meningkatkan Output Produksi Loyang dengan Metode Stopwatch Time Study

Olivia Eka Maharani, Erni Puspanantasari Putri, Afrigh Fajar Rosyidiin — Mon, 30 Jun 2025 00:00:00 +0700

UD. Loyang Pan Ikan is a manufacturing industry that has been producing galvalume trays since 2010. The production process is still done manually, involving four workers and producing an average of 4,000 baking sheets per month. Each worker handles more than one work element, which can trigger physical fatigue and impact the increase in standard time as well as the high workload. This research aims to analyze the workload, identify lesseffective activities, and determine the ideal number of workers. The methods used include Stopwatch Time Study to determine standard time, Work Load Analysis (WLA) to measure workload, and Work Force Analysis (WFA) to calculate labor requirements. The analysis results show that Worker 1's workload is 125.22% and Worker 4's is 120.58%, which exceed the normal limits. Therefore, it is recommended to add two more workers to reduce the workload and increase productivity.

A CNN-based Approach for Breast Cancer Classification from Ultrasound Images

Mon, 30 Jun 2025 00:00:00 +0700

Breast cancer is one of the most frequently diagnosed cancers and remains a leading cause of cancer-related mortality among women worldwide. According to WHO Globocan 2020, breast cancer ranks second globally, with 2,262,419 cases out of a total of 19,292,289 cancer cases, accounting for approximately 11.7%. Early detection plays a critical role in reducing breast cancer mortality. In this study, a machine learning-based approach using Convolutional Neural Networks (CNN) was employed to classify breast cancer using ultrasound imaging. The dataset, collected by Al-Dhabyani et al. at Baheya Hospital in 2018, consists of ultrasound images of women aged between 25 and 75 years. The proposed CNN model includes stages of data input, preprocessing, training, testing, and performance evaluation. The model achieved an accuracy of 85%, demonstrating promising results for automated breast cancer detection. Further optimization is recommended to improve classification performance.

Analisis Penyebab dan Upaya Meminimalkan Waste Sisa Pemotongan Plastik CPP pada Proses Produksi

Mochammad Ricky Dwi Yulianto, Herlina Herlina — Mon, 30 Jun 2025 00:00:00 +0700

PT. XYZ is facing a major issue of excessive plastic cutting waste during the CPP plastic production process, particularly at the slitter machine. This waste leads to material overuse, increased production costs, and decreased operational efficiency. This study aims to analyze the root causes of the waste and develop appropriate improvement strategies. The research applies the PDCA (Plan-Do-Check-Action) approach, supported by analytical tools such as the Pareto Diagram, Fishbone Diagram, Fault Tree Analysis (FTA), and Failure Mode and Effect Analysis (FMEA). The findings show that the most dominant type of waste is excessive cutting residue, contributing 80.07% of the total waste. The main cause is identified as a lack of standard cutting tolerance guidelines, categorized under method factors, with the highest RPN score of 320. Improvement strategies focus on SOP revision, operator training, and machine condition control. These efforts are expected to enhance production efficiency and significantly reduce waste.

Perancangan Perbaikan Tata Letak Produksi untuk Meningkatkan Efisiensi Proses Produksi Decking & Pintu

Jessica Mayddy Amanda, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

CV. Cipta Karya is a company engaged in the manufacturing industry sector of woodworking, furniture, sawmil, kilndry, warehouse rental, wood storage and log yard. CV. Cipta Karya implements the Make to Order system. One of the crucial challenges that arise in the production process of solid wood decking and doors is inefficiency in the arrangement of production facilities, high material handling costs, and material accumulation in the production area. This research aims to redesign the layout of production facilities by prioritizing improving the efficiency of the manufacturing process. The design is carried out through an approach of optimizing the distance between workstations and analyzing the material handling system, in order to smooth the production flow, reduce moving time, and minimize resource wastage.The research approach used includes evaluating the current layout of production facilities through the use of From-To Chart (FTC) to study and map the intensity and direction of material movement between workstations, so that inefficient flow patterns that have the potential to hinder the smooth production process can be identified, then the calculation of material handling costs (OMH), as well as analysis of the activity relationship between production facilities. Furthermore, a more optimal proposed layout was designed, which was then tested using the flexim 2025 simulation to evaluate the impact of production system efficiency.The findings of this study indicate that the proposed new layout design is able to significantly reduce the total distance of material transfer between workstations. These changes also have an impact on reducing material handling costs and increasing efficiency in the overall production process. In addition, the implementation of a more organized layout also makes a real contribution to cutting production cycle time and has positive implications for improving the overall productivity of the company.

Studi Kelayakan Investasi Mesin Stamping dan Usulan Tata Letak Fasilitas Mesin Produksi Spring Seat B

Davit Indra Permana, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

This study evaluates the feasibility of investing in a 63-ton stamping machine to boost Spring Seat B production at PT XYZ, Kampung Logam, Ngingas, Waru. The old machine produced 4,000 units/day, making it difficult to meet targets and requiring overtime. The new machine, costing Rp65,257,000, doubles the capacity to 8,000 units/day. Investment analysis using Payback Period and Break Even Point (BEP) shows a payback in 68 days, with a BEP of 539,916 units. In 2025, total production costs reached Rp1,662,308,586 and revenue was Rp1,867,296,000, resulting in a net profit of Rp204,987,414.08. Layout improvements were also made by relocating the rotary machine closer to the repair tool room to reduce the process distance and improve efficiency.

Simulasi System Dynamics Kualitas Tanah Terhadap Efisiensi Biaya dan Profit Usaha Tani di Desa Gunungsari

Elsa Amanda Putri, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

This study evaluates the effectiveness of soil pH enhancement and pesticide-use efficiency on operational costs and the profitability of a sustainable farming system in Gunungsari Village. In this area, rice and maize are cultivated alternately in the first and second planting seasons, heavily reliant on rainfall and irrigation. During the dry season, this dependency shifts to chemical fertilizers and water pumps, leading to a surge in operational expenses. Employing a triple bottom line approach (people, planet, profit), the methodology combines quantitative analysis via SmartPLS to identify dominant sustainability factors with system dynamics simulations in STELLA to test various policy scenarios. SmartPLS results identify soil pH as the most influential factor (44% contribution). Raising soil pH from 5.97 to 6.80 through liming and organic amendments significantly reduces reliance on urea fertilizer, lowering operational costs by 5.36–7.04% and boosting profits by 12.91% (Rice Season 1), 10.27% (Rice Season 2), 14.65% (Maize Season 1), and 13.83% (Maize Season 2). Moreover, a 20–80% increase in pesticide-use efficiency curtails production costs without sacrificing yield, supporting eco-friendly agriculture. This model provides a systemic overview of social, environmental, and economic interactions and informs data-driven policy recommendations for more efficient, adaptive, and sustainable farming.

Analisis Pengaruh Harmonisa Transformator Distribusi 2500 kVA

Alvera Apridalianti Melkias, Indriyani Indriyani, Taufik Hidayat — Mon, 30 Jun 2025 00:00:00 +0700

The high harmonic content in the electrical load or in the power distribution system can result in worse power quality, lower system power factor, distorted system voltage waveform, increased power losses in the system, overheating of the transformer, and inefficient use of electrical energy. So that it can reduce the efficiency of the transformer. The purpose of this study is to analyze the effect of harmonics on a distribution transformer with a capacity of 2500 kVA using a quantitative data collection method, namely primary and secondary data collection. This study offers an integrated approach that includes harmonic measurements and analysis of direct impacts on the efficiency of a 2500 kVA distribution transformer in the context of the automotive industry, which has not been widely reported in the national literature. Based on the results of measurements and calculations on the transformer, the Total Harmonic Distortion Current (THDI) value is + 9% which exceeds the permissible value of 8% while the Total Harmonic Distortion Voltage (THDV) value is + 2% in accordance with the permissible limit of 5%. The analysis results obtained that due to the presence of harmonics in the electrical distribution system, the distribution transformer experienced a decrease in its efficiency value by 2%, which was originally without harmonics the transformer efficiency was 98.8% and due to the presence of harmonics the transformer efficiency became 96.8%. The combination of real-time harmonic measurements and calculations in the industry not only offers technical advantages, but also strategically supports efficiency, reliability of the electrical system, and smarter data-based decision making.

Pemanfaatan Komposit Serat Bambu Jepang (Dracena Surculosa) dengan Penamban Material Powder

Ansor Salim Siregar, Sunny Ineza Putri, Indra Maulana, Venusa Abriandika — Mon, 30 Jun 2025 00:00:00 +0700

The development of natural composites offers solutions to various material challenges, with bamboo being widely utilized as a reinforcement due to its economic value. This research investigates the influence of material mixture parameters by incorporating Japanese bamboo fibers as reinforcement, along with aluminum powder, silicon dioxide powder, fluorocarbon powder, and epoxy hardener. Bamboo fibers were extracted using a chemical method involving 5% NaOH at 70°C for varying durations. Composites were fabricated with different fiber volume fractions (26%, 32%, 38%). Impact tests on the composite materials revealed a maximum impact strength of 1.13 J/mm² with an absorbed energy of 152 Joules. The highest dd strength, 118.30 N/mm², was observed in composites with 26% fiber volume fraction. Hardness tests yielded a maximum value of 681.4 HLB for the 26% fiber variation while bending tests showed a peak result of 9.37 N/mm for the 32% fiber variation. Conversely, the water absorption test indicated the lowest absorption value of 0.56% in the 38% fiber variation.

Analisis Risiko Keterlambatan pada Proyek Refractory di PT. BAR dengan Metode House of Risk

Benny Surya Putra — Mon, 30 Jun 2025 00:00:00 +0700

PT. BAR is a refractory material manufacturer and a provider of installation and repair services for industrial units such as boilers, furnaces, and dryers. In practice, the company faces problems with project delays that have an impact on operational cost inflation and decreased customer satisfaction. This study aims to identify the causes of project delays and formulate risk mitigation strategies systematically. The method used is the House of Risk (HOR), which consists of two stages of analysis. At the HOR-1 stage, risk event and risk agent identification is carried out, as well as the calculation of the Aggregate Risk Potential (ARP) value to determine the risk agent with the highest priority. Data were processed from 68 projects from October 2024 to March 2025, with the finding that 20 projects experienced delays and 19 projects experienced cost inflation exceeding the RAB. Furthermore, at the HOR-2 stage, five mitigation actions were prepared which were evaluated based on the ratio of effectiveness to the level of difficulty of implementation. The three main recommended mitigation actions are a maximum location survey of H-1, checking documents and equipment, and coordinating with users and vendors. As a form of implementation, a redesign of the project implementation flow was prepared that integrates mitigation actions into the actual work process, both for regular and sudden projects. The results of the study indicate that the designed mitigation can be applied applicatively and has the potential to increase the efficiency of implementation and control the risk of project delays preventively.

Pemanfaatan Bibit Unggul dan Pupuk Semi Organik untuk Ketahanan Pangan Berbasis Sistem Dinamis

Arla Meica Regita Sugianto, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

Sumber kepuh Village in Tanjunganom Sub-district, Nganjuk District, covers 763 hectares with 78% of it being paddy fields, making it the largest rice producer in the sub-district. However, farmers are still struggling to increase harvest profits. Analysis using SmartPLS showed that the dominance of elderly farmers as well as environmental factors such as fertilizer type, soil pH, and seed quality had a significant effect on yield. A dynamic systems approach through STELLA resulted in three profit improvement scenarios. The first scenario uses superior seeds and a young planting system, increasing profits from IDR 27,487,047,641 to IDR 31,983,065,202 (up 16%). The second scenario, using semi-organic fertilizers, increased profits to IDR 39,072,970,965 (up 42%). The third scenario, a combination of both, yielded IDR 40,568,583,572 (a 48% increase). The third scenario is considered the most optimal in improving farmers' welfare and encouraging the regeneration of young farmers to maintain long-term food security in Sumberkepuh Village.

Analisis Waktu Standar Produksi dengan Stopwatch Time Study Guna Penentuan Jumlah Tenaga Kerja

Alfan Ridho Alfan, Erni Puspanantasari Putri — Mon, 30 Jun 2025 00:00:00 +0700

UD Logam Abadi is a manufacturing company that produces accessories for PLN and Telkom, one of which is the Suspensen Q spare part. The company is experiencing difficulties due to the lack of a standard working time, resulting in workers not having daily targets, which impacts the achievement of production volume. Fluctuating market demand and the manual assembly process make the role of labor very important. This research aims to determine the standard production time and the optimal number of workers using the Stopwatch Time Study method. The research results indicate that the standard time to complete one unit of Suspensen Q is 550.49 seconds or about 9.16 minutes. The optimal number of workers needed is 2 to 3 per division.

Perancangan Relayout Warehouse Finish Goods dengan Metode Class Based Storage (CBS) di PT.XYZ Gresik

Muchammad Syauqi Habibillah, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

PT. XYZ is a ceramic tile manufacturing company that is facing warehouse challenges due to increased production, such as disorganized storage and high material handling costs. A warehouse layout redesign is required to improve operational cost efficiency. This study aims to propose a more effective warehouse layout using the Class-Based Storage (CBS) method, which classifies products into specific groups. The research was conducted over a period of three months, from December 2024 to February 2025. The results showed that the initial inbound travel distance was 17,877,537.04 meters, while the proposed inbound distance was 17,810,612.67 meters, resulting in a reduction of 66,924.37 meters. For outbound movements, the initial distance was 66,031,993.2 meters, and the proposed distance was 66,015,291.9 meters, achieving a reduction of 1,670.13 meters. The material handling cost per meter was obtained using the formula:(maintenance costs + operator costs) / (inbound material handling moments + outbound material handling moments),which resulted in an initial cost of Rp. 43 per meter, and a proposed cost of Rp. 40 per meter. The initial inbound material handling cost was Rp. 768,734,093, which decreased to Rp. 712,424,507, indicating a cost reduction of Rp. 56,309,586 over three months. For outbound goods, the cost dropped from Rp. 283,937,571 to Rp. 264,061,168, with a total savings of Rp. 19,876,403. The reduction in both distance and material handling costs reflects a significant efficiency improvement, contributing to substantial savings in warehouse operational expenses.

Analisis dan Perbaikan Set Up Time Dies untuk Minimalkan Waktu Henti Mesin Press dengan Pendekatan Lean Manufacturing Metode SMED di PT. Manufacturing Surabaya

Ady Syamsul Afirin — Mon, 30 Jun 2025 00:00:00 +0700

PT. Manufacturing Surabaya is a manufacturing company engaged in the production of clip components for automotive suspension systems. In carrying out its production activities, the company prioritizes high-quality products and good production productivity levels. The problem faced by the company is the high changeover setup time in the Production Division, specifically on the Press Machine. The changeover setup process of the dies on the press machine takes a long time during machine downtime. The setup changeover process reaches up to 3,126 seconds for a single changeover.This study aims to identify the factors causing the lengthy setup changeover process and to propose improvements using the Single Minutes Exchange of Dies (SMED) method. A fishbone diagram analysis indicates that the prolonged setup changeover time is caused by factors related to methods, manpower, machines, and environment.By implementing the SMED method, 21 internal activities were reduced to 16 internal activities. This change reduced the setup time from 3,126 seconds to 2,821 seconds, resulting in a 10% reduction in setup time and thereby improving production productivity.

Analisis Pengendalian Kualitas Produk Furniture dengan Metode SPC dan FMEA pada PT. Multi Manao Indonesia

Moch Nur Fadhil, Siti Muhimatul Khoiroh — Mon, 30 Jun 2025 00:00:00 +0700

This research addresses the importance of quality control in the furniture industry, particularly in maintaining product consistency and reducing defects. PT. Multi Manao Indonesia, a furniture manufacturing company, faces challenges in quality consistency, especially in the Setting Warna section. This study aims to analyze quality control at PT. Multi Manao Indonesia using the Statistical Process Control (SPC) method, focusing on the Aaron Side Chair product, and further identifying defect causes through Failure Mode and Effect Analysis (FMEA). SPC is used to monitor production process stability and detect variations affecting quality, while FMEA is applied to assess and prioritize potential failure modes. The findings are expected to support the company in improving process control, reducing defects, and enhancing production efficiency.

Perencanaan Kebutuhan Bahan Baku Pembuatan Kursi Susun untuk Memenuhi Permintaan Konsumen

Septian Adi Nugroho, Siti Mundari — Mon, 30 Jun 2025 00:00:00 +0700

PT. XYZ is a manufacturing company that produces various products such as PVC pipes, concrete products, and wooden furniture, including chairs. Currently, the company faces constraints in controlling raw material inventory for BR-600 Chair and Folding Chair products because it has not used scientific calculation methods in planning its needs. This causes an imbalance between the amount of inventory and production needs, which has an impact on overstock and understock. Overstock results in increased storage costs and the risk of obsolete raw materials, while understock causes production delays and potential loss of sales. This study aims to design a raw material inventory control system using a dynamic deterministic approach and determine the most optimal method. The approaches used include demand forecasting using the Single Exponential Smoothing and Moving Average methods, as well as calculating safety stock, optimal order size (lot size), and total inventory costs. Furthermore, inventory control planning is carried out using the Wagner-Whitin Algorithm and Silver-Meal Algorithm. The results of the study show that the application of the Wagner-Whitin Algorithm and Silver-Meal Algorithm methods in dynamic deterministic inventory control can reduce the total cost of raw material inventory for BR-600 Chair and Folding Chair by 5% and 3% respectively compared to the company's real method previously used by the company. Between the two, the Wagner-Whitin Algorithm method proved to be the most optimal with a total inventory cost of IDR 3,388,833,000.

Analisa dan Perbaikan Bottleneck pada Proses Hot Press

Alfian Marcelo, Herlina Herlina — Mon, 30 Jun 2025 00:00:00 +0700

PT. XYZ is a ceramic manufacturing company with several production lines, including the Mould Division at Plant 2, which is responsible for producing punches used as molds for the pressing machines. Based on observations and weekly production data analysis, a bottleneck was identified in the hot press process, resulting in failure to meet the production targets. This issue is indicated by a high average cycle time of 70.54 minutes per unit, which exceeds the ideal 56.25 minutes required to achieve the daily target of 8 units per shift.This study aims to identify the main causes of the bottleneck in the hot press process and propose improvements to enhance production efficiency. The methodology applied includes Value Stream Mapping (VSM) from the Lean Manufacturing framework to map the entire process flow and identify non-value-added activities. In addition, the Root Cause Analysis (RCA) method is utilized to trace the fundamental causes of the bottleneck.

Analisis Investasi Kelayakan Penambahan Armada Terhadap Biaya Oprasional dan Layanan

Tio Isman Prayogi, Siti Muhimatul Khoiroh — Mon, 30 Jun 2025 00:00:00 +0700

This study investigates the feasibility of investing in additional logistics fleets at PT XYZ, a manufacturing company based in East Java engaged in the production of rice and glutinous rice flour using imported raw materials. The complexity of distribution in the context of growing demand from MSME customers has caused operational problems in the form of late deliveries and backlog orders due to the limited number of available fleets. To overcome these problems, this study applies a quantitative approach based on investment analysis techniques, including Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP), and Sensitivity Analysis. Primary data were obtained from field observations and interviews, while secondary data came from the company's logistics records for the period November 2023 to January 2024. The results of the analysis show that additional fleets have a significant impact on improving service quality and distribution cost efficiency. The NPV and IRR approaches indicate that the investment is financially feasible, with a positive NPV value and IRR exceeding MARR. Meanwhile, the Payback Period is within a reasonable payback period according to the economic life of the fleet. Further sensitivity analysis confirms that variables such as operating costs and annual income are the main determinants of investment feasibility. These findings provide a strategic basis for data-based logistics investment decision-making, while strengthening the company's competitiveness in meeting customer expectations amidst competitive market dynamics.

Redesain Mesin Pengiris Singkong dengan Mekanisme Counterweight Gravity Feeder untuk Meningkatkan Produktivitas

Wiranti Kusuma Dewi, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

The Bojonegoro Cassava Chip MSME “Pak Ipul” faces production capacity constraints because its cassava slicing machine can only process 30 kg of cassava per hour. This study aims to redesign the cassava slicing machine by improving several key components such as the cassava feed chute, cutting blade, frame, motor + reducer, and drive system. The machine redesign is based on operator anthropometric data, referencing body dimensions such as elbow height while seated (64.46 cm), polyptal height (40.85 cm), knee height (50.33 cm), distance from elbow to fingertip (74.66 cm), and hip width while seated (45.15 cm), to create an ergonomic and safe design for the operator. The newly designed machine has a production capacity of 60 kg per hour, which is more efficient than the previous machine. The total cost of manufacturing the new machine is Rp 6,000,000, with raw material costs of Rp 3,900,000 and labor costs of Rp 2,100,000. Test results show a 50% increase in productivity, with a reduction in the time required to slice 75 kg of cassava from 2.5 hours to 1.25 hours. Depreciation analysis indicates that the new machine has a longer economic lifespan of 5 years, with annual depreciation of Rp 1,080,000, compared to the old machine, which only lasted 1 year. The Net Present Value (NPV) calculation for the new machine shows Rp 1,060,798.76, significantly higher than the old machine, which only generates Rp 24,235.45. Therefore, although the initial investment for the new machine is higher, it offers more significant long-term benefits and is worthwhile as an investment.

Perancangan Ulang Tata Letak Area Produksi untuk Mengurangi Biaya Material Handling di PT.XYZ

Angelina Jeni Santoso, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

PT. XYZ is a company engaged in the printing and packaging industry, located in East Java. PT. XYZ implements a Make to Order (MTO) production system, where the production process is carried out based on customer orders. The products produced in this study include Product A, B, C up to Product I, with various sizes and types of paper according to customer requirements. This research was conducted to address the problem of high material handling costs caused by inefficient material movement distances in the production area. Therefore, a facility layout redesign (relayout) was carried out to minimize material movement distances and reduce material handling costs. The research methods involved collecting primary and secondary data, analyzing the initial layout, designing two alternative layout proposals, and conducting simulations using FlexSim software. The results showed that Layout Proposal 2 provided the best efficiency, with a reduction in total material handling costs from Rp114,491,573 to Rp84,473,414 and a decrease in total material movement distance from 2,142 meters to 1,657 meters. This relayout proved that proper facility arrangement can improve production efficiency and reduce operational costs.

Analisis Kebutuhan Bahan Baku pada Proses Pengolahan Air Bersih di PDAM IPAM Ngagel Surabaya

Laksana Fadhil, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

The IPAM Ngagel in Surabaya treats water from the Surabaya River using Poly Aluminium Chloride (PAC) for coagulation and chlorine for disinfection. This study identifies the raw material needs for each treatment stage using daily production, chemical usage, and waste data to estimate requirements by the end of 2025. Average production is 4,480.03 L/second. PAC dosage ranges from 25.28–114.55 mg/L, chlorine from 0.96–5.72 mg/L. Estimated PAC needs range from 11,709.02–53,861.47 kg, and chlorine from 468.36–2,810.16 kg. Safety stocks and reorder points vary per unit: Ngagel I (PAC 18,480 kg; chlorine 686 kg), Ngagel II PAC 7,840 kg; chlorine 288 kg, Ngagel III PAC 19,012.5 kg; chlorine 840 kg. For 3-day PAC and 7-day chlorine reserves, Ngagel I needs 47,000–60,000 kg PAC and 3,000–3,750 kg chlorine, Ngagel II 21,500–25,500 kg PAC and 1,400–1,600 kg chlorine, Ngagel III 40,000–60,000 kg PAC and 3,900–5,400 kg chlorine.

Analisis Manajemen Rantai Pasok pada Peternakan Ayam Petelur Ras

Celinda Yunilatul Wotavia, Hery Murnawan — Mon, 30 Jun 2025 00:00:00 +0700

Blitar Regency is a major center for layer egg production in Indonesia, with one of its key producers being Artomoro Farm, located in Ngaringan Village, Gandusari District. This study analyzes the supply chain management and financial performance of Artomoro Farm over a 25-month production cycle. The upstream subsystem includes the supply of DOCs, feed, vitamins, vaccines, and medicines from various national suppliers. The farm houses 80,000 laying hens in a combination of close house and open house systems, achieving over 95% egg productivity and a monthly mortality rate of 0.5%. The feed warehouse has a capacity of 2,000 sacks (50 kg each). The downstream subsystem involves egg distribution to Jakarta, Surabaya, and Blitar, along with the sale of spent hens and chicken manure. With an initial investment of IDR 6.2 billion, the farm reached its break-even point in the 14th month and generated a final profit of IDR 13.4 billion. Results indicate an efficient, integrated, and sustainable supply chain.

Analisa Pengendalian Kualitas Produk Pipa Besi pada CV. XYZ dengan Metode Statistical Quality Control (SQC)

Fauzi Lukman Huda, Siti Muhimatul Khoiroh — Mon, 30 Jun 2025 00:00:00 +0700

This research investigates the quality control system for iron pipe products at CV. XYZ through the application of Statistical Quality Control (SQC). Recognizing the critical role of quality control in ensuring product standards and customer satisfaction within manufacturing, the study employs SQC methodologies, including control charts, Pareto diagrams, and fishbone diagrams, to analyze production process variations. Production data on iron pipe defects over a specific period November 2024 to May 2025. The analysis revealed prevalent defect types and indicated a statistically uncontrolled production process. Consequently, the study recommends a thorough evaluation and improvement of the underlying processes contributing to quality issues. Consistent implementation of SQC is projected to enable CV. XYZ to enhance product quality, minimize defects, and improve overall production efficiency.

Analisis Penyebab Ketidaksesuaian Akurasi Stok pada PT. X

Dewi Refi Mariska, Putu Eka Dewi Karunia Wati — Mon, 30 Jun 2025 00:00:00 +0700

PT. X is a leading ceramic tile manufacturer in Indonesia, with three main production facilities located in Surabaya, Gresik, and Bekasi, and warehouses located in Bali, Bandung, Jakarta, and Medan. This research aims to analyze and identify the impact of warehouse stock accuracy on the company’s operational needs. Stock accuracy also aims to identify the main factors that significantly contribute to inventory discrepancies in PT. X's warehouses and to formulate improvement strategies as recommendations that can be implemented to increase stock accuracy and achieve the goals set by the company in supporting overall warehouse operational effectiveness. This study uses the Root Cause Analysis method to identify and analyze the factors that are parameters of low stock accuracy in the warehouse, with the support of 5W+1H, Fishbone Diagram, and Pareto Diagram analyses to determine the root causes in detail. The findings of this study can be used as a basis for decision-making related to warehouse stock policies, stock opname scheduling, and improving stock accuracy.

Penentuan Waktu Baku untuk Proses Pengelolaan Limbah B3 di PT XYZ

Prima Fithri, Fahran Zofri, Alfadhlani Alfadhlani, Ranti Mustika Putri — Mon, 30 Jun 2025 00:00:00 +0700

PT XYZ is a manufacturing company in the automotive sector that produces vehicles and their components. Its production process generates hazardous and toxic (B3) waste classified as fast moving due to its high volume and frequency. This study aims to determine the standard time for the management process of iron gram B3 waste at PT XYZ. Observations were conducted over 15 cycles, with time recorded at each stage using the stopwatch time study method and adjustments based on the Westinghouse technique. The study was carried out across eight stages of the B3 waste management process at PT XYZ, involving calculations of cycle time, normal time, and standard time. The analysis revealed that the total standard time for the entire process is 42 minutes and 18 seconds. Establishing this standard time supports improved efficiency, prevents waste accumulation, and creates a more structured waste management system that can be periodically evaluated.

Studi Literatur: Pengembangan Superkapasitor Berdasarkan Jenis Elektrolit untuk Kinerja yang Lebih Baik

Mon, 30 Jun 2025 00:00:00 +0700

Supercapacitors are increasingly developing energy storage devices because they have advantages over conventional batteries and capacitors, such as high power density and long cycle life. Electrolytes are solutions that contain ions and function as electrically conductive media. In chemistry, electrolytes usually consist of acid, base, or salt solutions. The electrolyte used in supercapacitors plays a crucial role in achieving the desired power and energy density. In general, electrolytes are divided into two types based on their phase form, namely liquid and solid or gel electrolytes. Liquid electrolytes can be acids, bases or salts. While gel electrolytes are electrolytes that are denser in nature so that they can reduce leakage.