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All Journal Journal of Research and Technology JURNAL REKAYASA SISTEM INDUSTRI Jurnal Teknik Industri Terintegrasi (JUTIN) Journal of Social Research Asian Journal of Social and Humanities
Jaka Purnama
Universitas 17 Agustus 1945 Surabaya
Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Strategi Berkelanjutan dengan Pendekatan Interpretive Structural Modeling (ISM) Kondisi Pandemi Covid 19 pada UKM Furniture Jaka Purnama; Zainal Arief; Nur Rizka Athirah; Lingardi Wiratama
Journal of Research and Technology Vol. 8 No. 1 (2022): JRT Volume 8 No 1 Juni 2022
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

During the Covid-19 pandemic, furniture SMEs need to carry out a sustainable strategy analysis to maintain the continuity of SME activities. The limited sales made by furniture SMEs, due to the Covid 19 pandemic, hampered the sale of furniture products. Jombang furniture SMEs are business actors who process teak wood from forest products into furniture products that can provide added value. SME furniture is one of the leading products of Jombang district. Efforts to optimize the potential of existing resources, it is necessary to manage a sustainable supply chain strategy. Integrated strategic management in a sustainable manner based on economic, social and environmental aspects. The evaluation method used for the strategy formulation model is the Interpretative Structural Modeling (ISM) approach which is influenced by internal and external factors. Based on the economic, social and environmental elements, an alternative decision is taken that can be used in carrying out the business of producing furniture from each element. Implementation of activities must refer to government programs in the context of preventing the Covid 19 virus by imposing restrictions on community activities by not collecting mass in a place that will facilitate the spread of the Covid 19 virus. Sales strategy during the Covid 19 virus pandemic conditions by selling online, in accordance with government guidelines.
Analyzing The Impact of Contract Value, Project Duration, and Number of Floors on Human Resource Costs In The Agenci Dejenvolvementu Nacional Office Construction Project In Dili Using Multiple Regression João Raimundo; Budi Witjaksana; Jaka Purnama
Asian Journal of Social and Humanities Vol. 3 No. 6 (2025): Asian Journal of Social and Humanities
Publisher : Pelopor Publikasi Akademika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59888/ajosh.v3i6.524

Abstract

This study aims to analyze the influence of building construction project financing, which includes contract value, project duration, and number of floors, on human resource costs (Expert Costs, Skilled Labor Costs, and Worker/Mandor Costs) in building construction projects within the Dili City Government Office. The research focuses on 20 building projects in the Dili City Government Office environment. Using project report documents as data, the independent variables in this study are contract value, project duration, and the number of floors, while the dependent variables are the costs associated with experts, skilled labor, and workers/mandors/laden. The study employs multiple linear regression analysis to assess the relationship between these variables. The results show that the contract value has a significant partial effect on human resource costs, including expert costs, skilled labor costs, and worker/mandor costs. This indicates that a higher contract value influences the allocation of human resource costs in building construction projects. In conclusion, the study highlights the importance of managing contract value, project duration, and the number of floors to optimize human resource costs and ensure efficient project completion.
Cost and Time Analysis Using The Earned Value Method In The Construction of Villa Kandya House, Ubud, Bali Febri Cahyono; Budi Witjaksana; Jaka Purnama
Journal of Social Research Vol. 4 No. 3 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i3.2470

Abstract

In the Kandya House Villa Construction project in Ubud, Bali, there was a delay with a time deviation of -11.97%. This delay has the potential to cause the completion time of the work, which according to the contract is scheduled for 53 weeks, to be exceeded. To evaluate the time and cost performance in this project, the Earned Value method was used. This method utilizes three main indicators, namely Actual Cost of Work Performed (ACWP), Budgeted Cost of Work Performed (BCWP), and Budgeted Cost of Work Scheduled (BCWS). The results of the analysis show that the project time performance has decreased, characterized by a Schedule Variance (SV) value of -Rp 375,265,411.62. This value reflects a significant difference between planned and completed work. In addition, the Schedule Performance Index (SPI) was recorded at 0.772, which means that time efficiency only reached 77.2% of the planned schedule. As a result, the projected completion of work using the Estimate to Schedule (ETS) and Estimate at Schedule (EAS) indicators increased to 421 days or equivalent to 60.090 weeks, far exceeding the contract duration. In terms of cost, the analysis shows suboptimal performance, with a Cost Variance (CV) value of -Rp 48,700,590.06. This indicates that the actual costs incurred were higher than the planned budget for the completed work. In addition, the Cost Performance Index (CPI) value was recorded at 0.963, which means that the efficiency of budget utilization only reached 96.3%.
Feasibility Study of Pavement Repair Using The Benefit-Cost Ratio Method on The Jember District Boundary To Lumajang City Boundary Road Section Rendy Zesario Akbar; Budi Witjaksana; Jaka Purnama
Journal of Social Research Vol. 4 No. 3 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i3.2472

Abstract

Road damage frequently occurs due to poor construction quality, excessive vehicle loads, and extreme weather conditions. The Lumajang City Limit - Jember District Limit road segment has experienced significant damage at several points, primarily caused by vehicles carrying loads exceeding the designated capacity. This research aims to evaluate the current condition of the road, estimate the repair costs, and analyze the economic feasibility of the proposed repair works. The study employs a comprehensive methodology involving field surveys to collect primary data, such as the extent and types of road damage, and secondary data, including traffic volume and vehicle loading. The repair cost is calculated using the overlay method, which accounts for the required structural enhancements to improve road performance. The findings reveal that the total repair cost is estimated at IDR 227,301,086,503. Additionally, the economic feasibility analysis yields a Benefit-Cost Ratio (BCR) of 12.53, indicating that the repair project is highly viable from an economic perspective. These results provide a solid basis for prioritizing repair works and ensuring that investments in road infrastructure deliver significant economic benefits.
Analysis of Construction Costs For The KH Ahmad Dahlan Pohjentrek Road Section In Pasuruan City Considering Traffic Growth Rino Wahyu Pamungkas; Budi Witjaksana; Jaka Purnama
Journal of Social Research Vol. 4 No. 3 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i3.2473

Abstract

This study analyzes the impact of traffic growth on the structural lifespan and repair costs of the KH Ahmad Dahlan Pohjentrek road section in Pasuruan City. The primary aim is to assess traffic growth, calculate the equivalent single axle load (ESAL), and estimate construction costs using the 2024 Manual of Pavement Design (MDPJ) methodology. The research method involves calculating the ESAL for the road section, estimating construction costs, and recommending solutions to improve road performance. The results show that over a 10-year service life, the cumulative ESAL value is 26,047,040, indicating the need for a durable pavement design. The total construction cost is estimated at IDR 8.6 billion, with the majority of the costs allocated for pavement layers, including AC WC, AC BC, AC Base, and aggregate base courses. Additionally, the study emphasizes the importance of proper drainage management and regular maintenance to extend the lifespan of the pavement and reduce repair costs. In conclusion, the study recommends efficient resource procurement, road widening to alleviate congestion, integration of public transportation programs to reduce traffic dependency, and the implementation of modern monitoring technologies like Weight-in-Motion (WIM) systems to prevent overloading. These recommendations provide actionable insights for policymakers and stakeholders to enhance the road's performance, ensuring sustainable infrastructure development and minimizing future repair costs.
Analysis of Occupational Safety and Health (OSH) Management using The HIRARC Method in The Construction of Rubaru 1 Elementary School Midi Agus Permana; Budi Witjaksana; Jaka Purnama
Journal of Social Research Vol. 4 No. 5 (2025): Journal of Social Research
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/josr.v4i5.2527

Abstract

Construction projects in Indonesia continue to face high rates of workplace accidents due to inadequate implementation of Occupational Safety and Health (OSH) systems. This study aims to analyze how the Hazard Identification, Risk Assessment, and Risk Control (HIRARC) method can be effectively applied in the Rubaru 1 Elementary School construction project to minimize risks and improve workplace safety. Using a qualitative descriptive approach, data were collected through field observations, interviews, and documentation studies over six months. The research identified multiple hazards categorized by severity: six major risks, three high risks, and six medium risks. These included hazards from working at heights, exposure to chemicals, and improper use of personal protective equipment (PPE). Risk controls were implemented through administrative strategies (training, supervision), engineering controls (equipment modifications, warning signs), and mandatory PPE usage. The results showed that the HIRARC method is effective in systematically identifying and mitigating construction-related hazards. However, its success is influenced by the discipline of workers and management’s commitment to supervision. The findings emphasize the need for continuous evaluation and structured training programs to enhance OSH compliance and cultivate a safety-oriented culture in construction environments.
ANALISIS PENGENDALIAN KUALITAS UNTUK MENGURANGI PRODUK CACAT MENGGUNAKAN METODE FAILURE MODE AND EFFECT ANALYSIS DAN PROCESS CAPABILITY INDEX PADA PROSES PRODUKSI KEMASAN KALENG (Studi Kasus PT X) Nadya Permata Sari Putri; Jaka Purnama
JURNAL REKAYASA SISTEM INDUSTRI Vol 11 No 2 (2026): Mei 2026
Publisher : Universitas Putera Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33884/jrsi.v11i2.11619

Abstract

This study aims to analyze and control the quality of can products by identifying the main causes of defects and evaluating the capability of the production process. The problem faced by the company is the high defect rate exceeding the established standards, particularly dominant defects such as scumming. The methods used in this study are Failure Mode and effect Analysis (FMEA), the Plan-Do-Check-Act (PDCA) cycle, and the process capability index (Cpk). Data were collected through observation, interviews, and documentation during a specific production period. The analysis begins with identifying dominant defects using a Pareto diagram, followed by FMEA to determine the priority of failure causes based on the Risk Priority Number (RPN). Furthermore, continuous improvement is implemented through the PDCA cycle, which includes planning corrective actions, implementation, evaluation, and process standardization. The final stage involves calculating the Cpk index to assess the process capability in meeting company specification limits. The results indicate that several main defect causes with the highest RPN values require immediate improvement. The implementation of PDCA contributes to reducing defect rates and improving process control. However, the obtained Cpk values show that the production process is not yet fully stable and still requires further improvement. Therefore, improvements should focus on critical factors such as machine settings, operator skills, and operational procedures.
Implementasi Metode Collaborative Planning Forecasting and Replenishment untuk Minimasi Bullwhip Effect pada Supply Chain (Study Kasus: PT. XYZ ) M Hafizh Hasan Al Marufi; Jaka Purnama; Made Kastiawan
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 9 No. 2 (2026): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v9i2.59164

Abstract

PT. XYZ is a car mat manufacturing company in Surabaya facing challenges due to sharp, fluctuating client demands and uncertainties in material procurement. The bullwhip effect occurring within the company poses a high risk of raw material overstock mat, as well as stockout risks that can cause production downtime. This study aims to measure the existing bullwhip effect value, analyze material handling, and compare the effectiveness of quantitative forecasting methods under the Collaborative Planning, Forecasting, and Replenishment (CPFR) framework. Initial identification confirmed demand amplification, with bullwhip effect values of 1.349 in 2024 and 1.183 in 2025. Based on comparative accuracy testing for projecting the next 12 months' demand, the ARIMA (2,0,0) model was selected as the optimal method as it produced the minimum error value, with a Root Mean Squared Error (RMSE) of 2118.37 and a Mean Absolute Percentage Error (MAPE) of 7.93%. Utilizing this selected model, inventory control planning can be optimized, establishing the safety stock after forecasting at 3,978 units with a constant 1-month lead time.
Rancang Bangun Meja Kerja Portable Berbasis Ergonomi untuk Meningkatkan Kecepatan Kerja Gladis Widiandra; Jaka Purnama
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 9 No. 2 (2026): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v9i2.59175

Abstract

Gladbox.co.id is an MSME that makes cake and floral hampers. This business has high mobilityin its production activities but lacks supporting work facilities, resulting in excessive work movements, inefficient production times, and less ergonomic working conditions. These problems have an impact on decreased productivity and work comfort for workers. This study aims to create multifunctional portable work tables and chairs with ergonomic principles based on anthropometric data to improve production process efficiency and work comfort
Rancang Bangun Alat Pengaduk Kue Secara Ergonomis Guna Meningkatkan Kapasitas Produksi di UMKM Airin Muhammad Fadel Mahendra; Jaka Purnama
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 9 No. 2 (2026): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v9i2.59209

Abstract

MSMEs in the home food industry often face limitations due to manual production equipment, which results in low productivity because operators or employees often experience pain when faced with prolonged dough mixing. This study aims to design an ergonomic cake mixer to improve production efficiency and productivity at Airin MSME. The literature review included concepts of work ergonomics, anthropometry with body measurements, and worker productivity. The research method used was a quantitative approach, collecting data through observation, interviews, and worker anthropometric measurements. Data were analyzed using uniformity tests and percentile calculations to determine appropriate tool dimensions. The results showed that the designed tool reduced production time, reduced operator workload, and improved dough quality consistency. Furthermore, the tool design complied with ergonomic principles based on user anthropometric data. In conclusion, the ergonomic cake mixer design has proven effective in increasing productivity and work comfort at MSMEs. 
Co-Authors Budi Witjaksana Febri Cahyono Gladis Widiandra João Raimundo Lingardi Wiratama M Hafizh Hasan Al Marufi Made Kastiawan Midi Agus Permana Muhammad Fadel Mahendra Nadya Permata Sari Putri Nur Rizka Athirah Rendy Zesario Akbar Rino Wahyu Pamungkas Zainal Arief