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All Journal Jurnal Serambi Engineering AKM: Aksi Kepada Masyarakat JURNAL TEKNIK INDUSTRI Jurnal Riset danAplikasi Teknik Industri (JRATI) Journal Serambi Engineering (JSE)
Mochamad Rafi Herdiana
University Of Singaperbangsa Karawang
Religion Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Social Sciences Other

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Edukasi Tingkat Kesehatan Postur Pada Pekerja Industri Untuk Menghindari Gangguan Kesehatan MSDs Asep Erik Nugraha; Ratna Dewi Anjani; Deri Teguh Santoso; Mochamad Rafi Herdiana; Aviska Nuravianti; Muhamad Taufiq Rachmat
AKM Vol 3 No 2 (2023): AKM : Aksi Kepada Masyarakat Jurnal Pengabdian Kepada Masyarakat - Januari 2023
Publisher : Sekolah Tinggi Ekonomi dan Bisnis Syariah (STEBIS) Indo Global Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36908/akm.v3i2.670

Abstract

Industri saat ini mengalami perkembangan yang sangat pesat, penggunaan mesin dan teknologi yang saat ini menuntut operator untuk melakukan sesuatu dengan cepat dan tepat, permasalahan yang terjadi industri yang semakin kompetitif terhadap persaingan, namun tidak disertai dengan sistem kerja yang baik. Permasalahan terjadi pada mitra Sumber Jaya Tani proses produksi ikan bandeng yang membutuhkan waktu 8 jam dengan aktivitas postur kerja yang kurang baik. Tujuan untuk memberikan solusi dan pendampingan terhadap permasalahan yang terjadi pada mitra terkait tingkat kesehatan postur kerja. Metode yang digunakan adalah penyerahan standar operasional prosedur terdiri dari 6 divisi pada UMKM mitra dan sosialisasi, edukasi, serta pelatihan untuk transfer pengetahuan terkait gangguan MSDs dan kesehatan postur pada pekerja industri. Adapun output pengabdian dalam bentuk sosialisasi, edukasi, dan pelatihan pada kesehatan tingkat postur kerja melalui adanya SOP (Standar Operasional Prosedur) dapat memberikan arahan informasi secara tidak langsung serta pentingnya suatu industri UMKM memperhatikan kesehatan postur kerjanya dan melakukan upaya pencegahan secara mandiri.
Usulan Perbaikan Postur Kerja Dengan Menggunakan Metode Rapid Entire Body Assesment (RBA) Pada Pekerja Industri Ukm Ikan Bandeng Sumber Jaya Tani (Poklashar Cilamaya Wetan) Mochamad Rafi Herdiana; Asep Erik Nugraha; Risma Fitriani
JURNAL TEKNIK INDUSTRI Vol. 13 No. 2 (2023): VOLUME 13 NO 2 JULI 2023
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Indusri Universitas Trisakti

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Abstract

Intisari— UKM Ikan Bandeng merupakan sebuah usaha kecil dibawah naungan BUMDES di Desa Muara Baru, yang mayoritas bekerja sebagai nelayan. Pada proses pengolahan ikan bandeng kemasan, membutuhkan waktu 8 jam tanpa waktu istirahat dan kondisi ini semakin diperparah posisi berdiri merupakan posisi yang sering dilakukan dalam pengolahan ikan bandeng, sehingga menimbulkan cidera ergonomi pada postur kerjanya dapat menyebabkan musculoskeletal disorders (MSDs). Penelitian ini dilakukan untuk menganalisis risiko cidera pada postur kerja pekerja industri didasarkan atas keluhan yang terjadi dengan menggunakan kuesioner NBM (Nordic Body Map), dan dilakukan penilaian postur kerja dengan menggunakan metode REBA. Metode REBA merupakan metode yang digunakan untuk penilian postur kerja yang berfokus pada seluruh bagian tubuh. Proses yang dilakukan saat ini merupakan yang berisiko dan jika dilakukan secara berulang-ulang dapat menimbulkan cidera. Didapatkan secara umum kondisi setiap stasiun kerja pada UKM Ikan Bandeng memerlukan perbaikan. Dengan keluhan paling banyak dialami oleh bagian pencucian & pemotongan serta pengolahan terjadi di tubuh bagian atas, tengah, dan bawah. Skor REBA terbesar pemisahan ikan bandeng dengan jeroan sebesar 11 pada indikator ke 4. Yang lainnya pada indikator ke-3. Maka, diberikan usulan berupa penerapan Standar Operasional Prosedur (SOP) dalam memperbaiki postur kerja, serta sistem kerja yang ada pada setiap stasiun guna mengurangi musculoskeletal disorders. Abstract— SMEs Ikan Bandeng is a small business under the auspices of BUMDES in Muara Baru Village, the majority of which work as fishermen. In the process of processing packaged milkfish, it takes 8 hours without rest time and this condition is further aggravated standing position is a position that is often done in milkfish processing, resulting in ergonomic injuries in its work posture can cause musculoskeletal disorders (MSDs). This study was conducted to analyze the risk of injury to the work posture of industrial workers based on complaints that occurred using the NBM (Nordic Body Map) questionnaire, and an assessment of work posture was carried out using the REBA method. The REBA methods are methods used for the assessment of work postures that focus on all parts of the body. The current process is risky and if done repeatedly can lead to injury. With the most complaints experienced by the washing & cutting and processing parts occur in the upper, middle, and lower body. The largest REBA score of the separation of whitefish with offal was 11 on the 4th indicator. The other is on the 3rd indicator. Thus, proposals were given in the form of the application of Standard Operating Procedures (SOPs) in improving work posture, as well as the existing work system at each station to reduce musculoskeletal disorders.
Penilaian Risiko Postur Kerja Berdasarkan Metode RULA Pada Pekerja Manual Handling di Toko H. Dadang Mochamad Rafi Herdiana; Asep Erik Nugraha
Jurnal Serambi Engineering Vol 8, No 1 (2023): Januari 2023
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v8i1.5064

Abstract

Manual material handling is a very important study in the industrial world. Conceptually, material handling in workers by utilizing labor. Flexibility of movement and wide accessibility are among the reasons the industry still utilizes manual material refining. On the other hand, the risk caused by the work is spinal injury (low back pain). Many use methods to analyze working postural on MMH. The study used the RULA method and a nordic body map questionnaire. The use of NBM questionnaires to find out complaints ergonomically, while the RULA Method is to analyze ergonomic risks in the upper part of the body. Toko H. Dadang is a grocery store that sells various basic necessities and others, with operators totaling 4 people. In the results of this study 4 people had upper ergonomic injuries. with the help of NBM questionnaires and analyzing the relationship of ergonomic risk with the RULA method. In the RULA method assesses the work of operators, on operators 1 it is worth 7. Thus, recommendations are given by using a freight trolley to prevent further ergonomic risks. 
Lever Assy Product Distribution Needs Planning with the Distribution Requirement Planning Method in the Automotive Industry Herdiana, Mochamad Rafi; Herwanto, Dene
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

The market demand to get quality products is not enough to be answered only by the company's ability to provide the requested products, the company's ability to fulfill order stock, low prices, order time targets, and marketing capabilities. Planning for product availability and distribution processes is also needed to meet consumer needs. PT XYZ is a company engaged in the automotive sector as a supplier. The problem that occurs is that there is an over cost distribution so that the company has to increase costs for the distribution of Lever Assy products. One of the reasons that allegedly caused the problem was because the forecasting that became the basis for the company to take policies in the distribution process of the Lever Assy product was not done properly. The goal to be achieved in this study is to plan distribution needs by considering the demand aspect to avoid over cost distribution. The results of this study show that the total cost incurred based on the company method is Rp71,614,500, while using the distribution requirement planning method is Rp52,864,500, which means that there is a savings of Rp.18,750,000 with a percentage of 26%.
Marketing Strategy Determination Using Markov Chain and Game Theory: A Case Study of Ready-to-Drink Tea Products Herdiana, Mochamad Rafi; Dewi, Yulida Intani; Ikatrinasari, Zulfa Fitri; Amrina, Uly
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Decrease in the number of demand in the market and the transfer of consumers from the Nuu Green Tea brand to the Pucuk Harum Tea brand or vice versa is a result that can occur from market share competition. The calculation results obtained after doing manual calculations using the Markov chain method are the probability of transferring the subscription from each product a few times ago, at this time, and the time to come. For the time to come alone based on the steady state obtained is in the 10th year period. With the probability value of the movement from the shoot tea to Nuu Green Tea is 0.413 for a period some time ago and at this time, for other products transfer can be seen in Figure IV.6. For the value of the steady state in the 10th iteration with the mastery of the shoots of the market share of 0.4158 or 41.58% and Nuu Green Tea controlled the market share of 0.5841 or 58.41%.  The calculation results that have been done manually and the use of application assistance can be concluded that the use of the maximin-minimax method produces an optimum solution, namely on X1 for row players (The Pucuk), and Y1 for column players (Nuu Green Tea). With a game value of 32. then the best marketing strategy used by Teh pucuk and Nuu Green Tea is the attribute 'flavor variant' by utilizing the flavor variant of the two can compete in the flavor variant.
Peningkatan Kapasitas Mesin Rubber Sheet Calendar Menggunakan Discrete Event Simulation: Studi Kasus di Industri Pengolahan Karet Herdiana, Mochamad Rafi; Elfantoro, Indra; Dewi, Yulida Intani; Kurniawan, Indra
JURNAL RISET DAN APLIKASI TEKNIK INDUSTRI Vol. 3 No. 01 (2025): Volume 03 Issue 01, Agustus 2025
Publisher : Study Program of Industrial Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRATI.2025.v03.i01.p11

Abstract

Increasing production capacity is one of the key strategies to maintain the competitiveness of tire companies in an increasingly dynamic and competitive market. One of the critical machines in the tire production process is the Rubber Sheet Calender, which currently has a capacity of only 2700 Tires Per Day (TPD). However, based on the sales forecast for 2025, the required production capacity is expected to reach 3000 TPD. This study aims to analyze and enhance the capacity of the Rubber Sheet Calender machine using the Discrete Event Simulation (DES) approach. Data were collected through direct observation, time studies, and interviews with machine operators and production supervisors. A simulation model was developed to represent the actual condition (as-is), and improvement scenarios were tested, including adding labor, increasing buffer capacity, and reducing setup time. The simulation results show that a combination of improvements can significantly increase throughput by increasing machine speed from 4.65 to 6.31 (a 36% increase) and raising production capacity from 3360 to 4962 (a 59% increase). Thus, the improvement recommendations using DES have proven to be an effective decision-support tool for enhancing production capacity.
Optimasi Peramalan Penjualan Perishable Product dengan Metode Time Series Menggunakan Software POM-QM Dewi, Yulida Intani; Herdiana, Mochamad Rafi; Hernadewita
JURNAL RISET DAN APLIKASI TEKNIK INDUSTRI Vol. 3 No. 01 (2025): Volume 03 Issue 01, Agustus 2025
Publisher : Study Program of Industrial Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JRATI.2025.v03.i01.p10

Abstract

Perishable products are items with short shelf life. In this study, perishable product being analyzed has only one day shelf life. Therefore, an accurate forecast method is needed to avoid shortage and waste. Shortage occurs whend demand exceeds the company’s stock, resulting potential loss sales. Waste occurs when demand is lower than available stock, leading to overstock. Excexx inventory causing losses and reduces profit. This study is conducted using 2 scenarios, as shown in Table 1. Scenario 1 uses 60 days od data, while scenario 2 separates data between weekend and weekdays. Data abalysis was performed using time series method with POM-QM software. The best method is determined based on lower MAD, MSE, MAPE. The result of this study sho that separating the historical data between weekends and weekdays (scenario 2) leads to better forecasting accuracy, indicated by a lower MAPE compared to scenario 1. For weekend forecasting, the best method is exponential smoothing (Scenario 2A.2) with MAPE 10,05%. For weekday forecasting, the best method is moving average (Scenario 2B.1) with MAPE 15,40%. The research is expected to serve as a reference for company in selecting appropriate forecasting method. The goal is to help company anticipate shortage and waste in perishable products. The recommendation for company is automate the separation of weekend and weekday data to accelerate the forecasting prosess. Future research recommendation is use other forecast method and software, then consider factor consists of shelf life, promotion, national holidays, or national event.
Inventory Management Optimization of Snack to Minimize Days Sales Inventory (DSI) and Total Cost Dewi, Yulida Intani; Elfantoro, Indra; Herdiana, Mochamad Rafi; Ikatrinasari, Zulfa Fitri
Jurnal Serambi Engineering Vol. 11 No. 1 (2026): Januari 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

This study aims to optimize inventory control for snack products in the retail industry, characterized by highly fluctuating demand and elevated Days Sales Inventory (DSI) levels. Focusing on Class A products with high DSI offers the greatest potential impact on inventory management efficiency. The approach integrates Holt-Winters forecasting, ARIMA (1,1,1), and Random Forest Regression with quantitative models such as Economic Order Quantity (EOQ) and Periodic Order Quantity (POQ), as well as stock control techniques including Safety Stock and Reorder Point, to determine the optimal order quantity and ordering time. Sales data for 21 weeks were processed to generate sales forecasts for the subsequent 31 weeks, covering weeks 22 through 52, using all three forecasting methods. The evaluation metrics indicate that Random Forest Regression achieved the best performance, with a Mean Absolute Error (MAE) of 42.4, Mean Absolute Percentage Error (MAPE) of 13.9%, and a Root Mean Squared Error (RMSE) of 46.7, The results show a significant reduction in DSI and total costs, contributing positively to strengthening the company’s cash flow. Further analysis over the 31-week period using the POQ method resulted in a decrease in DSI from the actual level of 111 days to 71 days, and also reduction in total cost from IDR 14.933.114 to IDR 10.104.863, representing a difference of IDR 4.828.250. In addition to the integrated forecasting and EOQ–POQ methods, it is recommended to enhance the adaptation of dynamic forecasting models that are more responsive to changes in demand patterns and to develop real-time monitoring systems using ERP or IoT technology to minimize the risks of stockouts and product spoilage. This research provides both practical and academic contributions toward achieving more efficient and sustainable inventory management for snack products. 
Design and Development For Stock Locator: A Case Study of FMCG Companies Herdiana, Mochamad Rafi Herdiana; Dewi, Yulida Intan Dewi; Hernadewita, Hernadewita
JURNAL TEKNIK INDUSTRI Vol. 16 No. 1 (2026): March 2026
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Indusri Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jti.v16i1.22827

Abstract

Inventory management in a finished goods warehouse often faces the challenge of quickly and accurately locating goods, which impacts operational efficiency and reduces inventory picking errors. This research aims to design a stock locator application that facilitates the real-time finding and monitoring of goods in finished goods warehouses. The methods used include user needs analysis, intuitive user interface-based system design, and web-based application development to ensure broad accessibility. In addition, the app implements an efficient location search algorithm to speed up stock searches. The application design significantly optimizes warehouse operations by replacing manual searching with precise digital navigation and route optimization, drastically reducing retrieval time. Accuracy is guaranteed through mandatory barcode validation and real-time inventory syncing, ensuring the physical stock always matches the digital record. Furthermore, it mitigates human error by eliminating manual data entry and enforcing strict, system-guided workflows that prevent incorrect picks before they occur. The application design uses a Use Case Diagram to map actors with an interest in inventory management and to define the technical design based on the functionality of the inventory management application. The design aims to avoid existing costs, such as Container Accommodation Costs or Shipping Delays. Before the implementation of this application, the total findings for 1 semester were 10 findings of existing shipping closing, after which 0 findings of existing shipping closing—the previous loss of Rp. 10,000,000 became Rp. 0. These findings make an important contribution to the application of information technology in warehouse management and open up opportunities to increase productivity through the digitization of storage and inventory sourcing processes.
Co-Authors Anjani, Ratna Dewi Asep Erik Nugraha Aviska Nuravianti Dene Herwanto Deri Teguh Santoso Dewi, Yulida Intan Dewi Dewi, Yulida Intani Elfantoro, Indra Hernadewita Indra Kurniawan Muhamad Taufiq Rachmat Nugraha, Asep Erik Risma Fitriani Uly Amrina Wajdi, Muhammad Raihan Yasin, Rahmat Zulfa Fitri Ikatrinasari