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Inventa: Journal of Science, Technology, and Innovation
Published by CV SCRIPTA INTELEKTUAL MANDIRI
ISSN : 31233147     EISSN : 31233155     DOI : 10.65310
Core Subject : Engineering,
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Inventa: Journal of Science, Technology, and Innovation is a peer-reviewed scientific journal that focuses on the dissemination of high-quality research in the fields of science, technology, and innovation. It serves as an open platform for researchers, engineers, practitioners, and academics to publish original studies, applied research, and theoretical developments that advance scientific and technological knowledge. The journal welcomes manuscripts covering various topics, including natural and applied sciences, engineering and technology, information and communication technology, industrial innovation, renewable energy, and environmental studies. All submissions undergo a rigorous double-blind peer-review process to ensure academic integrity, originality, and scientific excellence. Inventa is published triannually in April, August, and December, promoting innovative, sustainable, and forward-looking contributions that support scientific progress and technological advancement at both national and international levels.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 98 Documents
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Analisis Pengendalian Persediaan Bahan Baku Menggunakan Metode Economic Order Quantity (EOQ): Studi Kasus pada PT Maju Bersama Industri Denny Andwiyan; Jawahir Jawahir; Patrick Andraes Napitupulu
Journal of Science, Technology, and Innovation Vol 2 No 1 (2026): : August: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/v68fsk62

Abstract

Raw material inventory control is one of the crucial aspects in maintaining the continuity of production processes in manufacturing companies. Inaccuracy in determining the amount of raw material orders often causes two opposing problems, namely excess inventory (overstock), which results in increased storage costs, or inventory shortages (stockouts), which can disrupt the overall production process. This study aims to analyze raw material inventory control at PT Maju Bersama Industri by applying the Economic Order Quantity (EOQ) method as a quantitative approach to determine the most economical order quantity. The research method used is descriptive quantitative research with primary data obtained through direct interviews with the production manager and secondary data from the company’s inventory reports for one year. Based on the calculation results, the EOQ value obtained is 1,549 units per order, the optimal ordering frequency is 15 times per year, the total inventory cost is Rp7,745,967, the safety stock is 200 units, and the Reorder Point (ROP) is 600 units. The results of this study indicate that the consistent implementation of the EOQ method can help companies minimize total inventory costs while maintaining raw material availability so that production processes can run smoothly and efficiently.
Evaluasi Risiko Musculoskeletal Disorders pada Pekerja Mebel dengan Metode REBA dan RULA Sebagai Dasar Inovasi Desain Meja Kerja Dedy Iskandar; Sugina Sugina; Putri Septiani Lestari
Journal of Science, Technology, and Innovation Vol 2 No 1 (2026): : August: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/7sdr7585

Abstract

Raw material measuring activities in the furniture industry are commonly performed on the floor, forcing workers to maintain prolonged squatting, bending, and neck flexion postures that increase the risk of Musculoskeletal Disorders (MSDs). This study aimed to evaluate ergonomic risk using the Rapid Entire Body Assessment (REBA) and Rapid Upper Limb Assessment (RULA) methods as the basis for developing an ergonomic workbench design. A descriptive quantitative approach was employed through observation, interviews, documentation, work posture assessment, and anthropometric measurements of five workers. The results indicated a REBA score of 12 (Very High Risk) and a RULA score of 7 (Investigate and Implement Change). Based on these findings, an anthropometry-based ergonomic workbench was designed to improve working posture and increase production efficiency, reducing working time from 36 minutes to 23.5 minutes (34.7%). The proposed innovation is expected to reduce MSD risks while improving occupational safety, comfort, and productivity.
Perencanaan Anggaran dan Analisis Kelayakan Investasi Pembangunan Rumah Tinggal Tipe 36 Sebagai Rumah Sewa (Ditinjau dari NPV, IRR, dan Payback Period) Iqbal Haqi; Rezi Munizar
Journal of Science, Technology, and Innovation Vol 2 No 1 (2026): : August: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/jjczwq26

Abstract

This study aims to analyze the budget planning and investment feasibility of constructing Type 36 residential units to be used as rental housing, using the Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PP) indicators. The method used is an empirical study with a quantitative approach that integrates construction engineering and engineering economics analysis. The research stages included calculating the volume of work, preparing a Cost Budget Plan based on a Unit Price Analysis, preparing cash flow projections over the investment’s lifespan, and evaluating financial feasibility using the concept of the time value of money. The results show that the initial investment required for constructing a Type 36 house is Rp325,000,000, with the majority of costs attributed to structural work and masonry. Cash flow simulations demonstrate the project’s ability to generate stable rental income throughout the investment period. The feasibility analysis yielded a Net Present Value (NPV) of Rp29,617,428, an Internal Rate of Return (IRR) of 12.84%, and a Payback Period of 8.4 years. These values meet the criteria for a viable investment because they generate positive economic value added, a rate of return higher than the minimum acceptable rate of return (MARR) of 10%, and a payback period that remains within the investment horizon.
Perencanaan Drainase Terbuka di Simpang Nangka Kecamatan Selupu Rejang Kabupaen Rejang Lebong Ramos Yusgima; Rezi Munizar
Journal of Science, Technology, and Innovation Vol 2 No 1 (2026): : August: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/mxcxct42

Abstract

A drainage system that is unable to accommodate runoff discharge is one of the factors causing flooding, which impacts road service functionality and infrastructure sustainability. This study aims to design an open drainage system at Simpang Nangka, Selupu Rejang Subdistrict, Rejang Lebong Regency, through an evaluation of existing conditions, hydrological analysis, hydraulic capacity calculations, and the preparation of construction cost estimates. The study employed an empirical approach through field surveys, rainfall data collection, design flow analysis using the rational method, and channel capacity calculations using Manning’s equation. The results indicate that the existing channel is unable to optimally convey runoff due to limitations in its dimensions and physical condition. The design for the new channel specifies a width of 0.3 meters, a water level of 0.2 meters, and a freeboard of 0.5 meters, capable of conveying a flow rate of 0.444 m³/s. The estimated construction cost of Rp118,413,000.00 demonstrates the feasibility of implementing this design as a flood control solution based on local characteristics.
Analisis Pengaruh Kualitas Material terhadap Kuat Tekan Beton pada Pembangunan Gedung Bertingkat Andika Candra; Rezi Munizar
Journal of Science, Technology, and Innovation Vol 2 No 1 (2026): : August: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/j711dx92

Abstract

Concrete is the primary material used in the construction of high-rise buildings because it can withstand compressive loads and ensure long-term structural stability. This study aims to analyze the effect of constituent material quality on concrete compressive strength through a laboratory experimental approach. The research method utilized two variations of concrete mixes with a design strength of fc′=30 MPa: one using standard-grade materials and the other using substandard materials with high aggregate silt content and suboptimal coarse aggregate gradation. Tests were conducted on 150 × 300 mm cylindrical specimens at 7, 14, and 28 days using a compression testing machine. The results showed that concrete made with standard materials achieved a compressive strength of 31.2 MPa, while concrete made with substandard materials reached only 24.5 MPa—a 18.4% reduction from the design strength. These findings indicate that material quality plays a crucial role in determining concrete density, internal bond strength, and the structural reliability of multi-story buildings.
Perencanaan Sistem Penyediaan Air Bersih (SPAM) Desa Kampung Delima Kecamatan Curup Timur Kabupaten Rejang Lebong Samsul Huda; Rezi Munizar
Journal of Science, Technology, and Innovation Vol 2 No 1 (2026): : August: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/zjdzmj68

Abstract

The availability of clean water that meets standards for quality, quantity, and continuity is a strategic necessity for the development of basic infrastructure in rural communities. This study aims to plan a Clean Water Supply System (SPAM) for Kampung Delima Village, East Curup Subdistrict, Rejang Lebong Regency, through an analysis of water needs, distribution network design, and evaluation of the system’s hydraulic performance. The study employed an empirical approach involving the collection of topographic data, water source characteristics, and demographic data, which were then analyzed using geometric projection methods, water demand standards from the Directorate General of Public Works, and piping network simulations using EPANET 2.2. The results show that the population in 2046 is projected to reach 3,250 people, with an average water demand of 4.13 liters/second and a peak hourly flow rate of 6.19 liters/second. The system was designed using a gravity-fed method with a reservoir capacity of 71.5 m³ and an HDPE pipeline network. Hydraulic simulations show that residual pressure and flow velocity meet technical service criteria. This study produced an adaptive, efficient, and sustainable drinking water supply system design suited to the characteristics of rural areas.
Analisis Penerapan Keselamatan dan Kesehatan Kerja (K3) Konstruksi pada Proyek Pembangunan Gedung Sekolah SD Negeri 7 Bengkulu Tengah Sofyan Ansori; Rezi Munizar
Journal of Science, Technology, and Innovation Vol 2 No 1 (2026): : August: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/mdw22b74

Abstract

The construction industry has a high rate of workplace accidents, making the implementation of Occupational Safety and Health (OSH) a fundamental aspect of project success. This study aims to analyze the level of OSH implementation, identify factors hindering implementation, and formulate strategies to improve safety in the Construction Project of the State Elementary School No. 7 in Central Bengkulu. The research method employed a mixed-methods approach through field observations based on the SMKK checklist and a Likert-scale questionnaire administered to 30 respondents, consisting of project management, foremen, and construction workers. The results showed a 63% compliance rate with OSH implementation, categorized as “adequate,” while the use of secondary PPE, emergency response facilities, and safety supervision were identified as areas requiring improvement. The main inhibiting factors include low worker discipline, limited supervision, and suboptimal safety education. The study recommends strengthening the safety culture through routine training, periodic inspections, and work-activity-based risk control to support the achievement of safe construction.
Pembangunan Box Culvert untuk Penanggulangan Banjir pada Jalan Utama Kelurahan Talang Rimbo, Kabupaten Rejang Lebong Dwi Aji Ttriono; Rezi Munizar
Journal of Science, Technology, and Innovation Vol 2 No 1 (2026): : August: Inventa: Journal of Science, Technology, and Innovation
Publisher : CV SCRIPTA INTELEKTUAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65310/hp295884

Abstract

Urban flooding in areas with high transportation activity is an infrastructure problem influenced by increased surface runoff, limited drainage capacity, and changes in land-use characteristics. This study aims to analyze design flood discharge, evaluate existing drainage capacity, and design box culvert dimensions as a flood control solution on the Main Road of Talang Rimbo Village, Rejang Lebong Regency. The research method employs a quantitative approach based on hydrological and hydraulic analysis through calculations of design rainfall using the Gumbel distribution, Mononobe rainfall intensity, and Rational Method flood discharge, as well as an evaluation of channel capacity using Manning’s equation. The results show that the design flood discharge reaches 5.54 m³/s, while the capacity of the existing channel is only 0.28 m³/s, resulting in a capacity deficit of 5.26 m³/s. A box culvert with dimensions of 1.6 m × 1.8 m can increase flow capacity and provide a technical solution to the flooding problem. This study contributes to the development of urban drainage designs based on hydrological and hydraulic approaches to enhance infrastructure resilience against flood risks.

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