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Jurnal Teknologi dan Manajemen
Published by Institut Teknologi Adhi Tama Surabaya
ISSN : -     EISSN : 27211878     DOI : https://doi.org/10.31284/j.jtm.2024.v5i1.5411
Core Subject : Engineering,
Engineering
Jurnal Teknologi dan Manajemen (JTM), ISSN 2721-1878, is an open-access journal dedicated to provide a platform in management and technology aspects. This journal aims to publish renewable works in implementation of basic theories, experiments, simulations, and applications with systematic method; reviews of previous works; expansions of summary; or others. This journal is published twice a year, on January and July.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 147 Documents
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Effect of Alkaline Activator Addition on Grout Mortar Made from Cement and Silica Fume with Si/Al Ratios Agustin Dita Lestari; Aulia Rahman; Agus Sugiarto; Armin Naibaho
Jurnal Teknologi dan Manajemen Vol 7, No 2 (2026): July
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2026.v7i2.8626

Abstract

The demand for improved material performance continues to increase as alternative materials technologies develop. Likewise with construction materials such as concrete, mortar, and the like. Grout mortar is a type of mortar that is commonly used to repair porous construction structures. As with filler materials in general, strength performance is also a demand in order to obtain a cohesive unity with the main structure. The addition of chemicals is allegedly an alternative that is worth studying to further increase the strength of materials, because changes in chemical properties will lead to changes in physical capabilities, in this context strong pressure. One example of a chemical composition that is widely used to improve the performance of a mixture is an alkaline activator due to its reactive properties. The addition of alkaline activators in certain proportions will change one of the chemical structures of the material, namely the ratio of silica and aluminum contents, or better known as the Si/Al ratio. With the benchmark in the previous study, the chemical content was analyzed by the XRF test, then a new mixture was made with a modified Si/Al ratio close to the target level, which are 4.5, 4.75, and 5. The research sample turned into a 5 x 5 x 5 cm mortar cube that was tested for compressive strength at the age of 7 and 28 days. After conducting research and analysis, it was found that none of the variations in the Si/Al ratio showed positive results in the development of compressive strength when compared to the performance of the previous sample. Only an average compressive strength of 15.8 MPa was obtained for the 7-day-old sample and 21.16 MPa at 28 days of age, while the sample was preceded at around 30 MPa and 40 MPa for the same age. This shows that the increase in the Si/Al ratio to the limit of 5 is inversely proportional to the improvement in the performance of the grout mortar.
Material Supply Model with the Perspective of Capacity Planning and Material Limitations to Minimize the Risk of Production Uncertainty in SMEs Tanggulangin Sidoarjo Rony Prabowo; Wanvia Vangesti
Jurnal Teknologi dan Manajemen Vol 7, No 2 (2026): July
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2026.v7i2.9247

Abstract

SMEs are a very important pillar of the Indonesian economy, because apart from being able to produce various types of community needs and being a contributor to regional income, they are also able to absorb non-formal workers with low education. In Sidoarjo Regency, East Java, there is an SME cluster area in Tanggulangin village with a total of 328 SMEs with 18,464 workers. This UKM produces various types of handmade crafts which are in great demand by local, non-provincial and overseas consumers. This research is very important for SMEs in Tanggulangin because with the existence of a material supply model that takes into account the perspective of capacity planning and material limitations, it will really help SMEs to purchase materials effectively and efficiently in order to meet consumer demand according to the number of orders so that the profits obtained by SMEs are optimal. The MRP method is used for material requirements planning, RCCP for rough-cut capacity validation, CCR for bottleneck identification, TOC for bottleneck optimization, and Monte Carlo for risk analysis. The integration of Monte Carlo, RCCP, TOC, CCR, and MRP results in a capacity planning system that is structured (spanning from planning to risk evaluation), constraint-based (avoiding over-optimism), and adaptive to uncertainty. Monte Carlo simulation models the operation of two machines handled by a single operator with an optimal operating time of 5 hours; RCCP indicates an optimal production process of one batch with a 45 kg capacity; and the ideal TOC value falls within a range where process transitions must occur between a minimum of 3 minutes and a maximum of 45 minutes. In the work element of cutting rolls of tanned leather into patterned leather pieces one by one at the leather craft product work center 1, the capacity requirements cannot be met using only 2 work shifts. To anticipate capacity shortages that will occur throughout 2024, this can be done by adding overtime hours, extra days, MRP revisions, and MRP revisions with overtime. If proposed strategy 1 (additional overtime hours) is implemented, it would cost IDR 153,266,618 in one year. And if proposed strategy 2 (extra day) is implemented, it will cost IDR 219,513,728 in one year. The third proposed strategy, namely MRP revision, requires no costs at all to implement. The costs incurred if strategy 4 (MRP revision with over time) is implemented is IDR 145,687,500 in one year.
Production Process Time Reduction Strategy through SMED Method Implementation Andi Dwi Wahyu Wibowo; Taufik Rachmad Fauzy; Surjo Hadi
Jurnal Teknologi dan Manajemen Vol 7, No 2 (2026): July
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2026.v7i2.9252

Abstract

The increasingly competitive manufacturing industry demands companies to improve operational efficiency, particularly in the changeover process, which contributes to production downtime. This study aims to analyze the application of the Single Minute Exchange of Dies (SMED) method in reducing setup time in the packaging process to improve production efficiency. The study uses a quantitative approach through direct observation, measuring work time, identifying internal and external setup activities, converting internal activities to external ones, and simplifying non-value-added activities. The results show that the application of SMED can reduce setup time from 265 minutes to 180 minutes, a reduction of 85 minutes (32%). Improvements were made through optimizing the mold installation process, which saved 20 minutes, improving eyemark settings, which reduced the time by 5 minutes, and improving cutter settings, which reduced the duration from 120 minutes to 60 minutes. The research findings prove that the SMED method is effective in increasing the efficiency of the changeover process, reducing production downtime, and increasing productivity in the packaging process. This study provides a practical contribution as a reference for the application of SMED in an effort to improve operational performance in manufacturing industries with similar product changeover characteristics.
Comparation of Impedance Functions for Modelling Student Trip Distribution at Surabaya Senior High Schools Citto Pacama Fajrinia; Nina Saraswati; Verdy Ananda Upa; Anik Budiati
Jurnal Teknologi dan Manajemen Vol 7, No 2 (2026): July
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2026.v7i2.9185

Abstract

Student travel from home to school is an important component of urban mobility because it generates concentrated travel demand during school arrival and dismissal periods. This study compared the Negative Power, Negative Exponential, and Tanner impedance functions in representing student trip-length distributions at four public senior high schools in Surabaya, Indonesia. Primary data were collected through questionnaire-based surveys involving 262 students. Home-to-school travel distances were grouped into 3-km intervals, and the proportion of trips within each interval was calculated for each school. The three functions were calibrated using the observed distributions and evaluated using the Sum of Squared Error (SSE) and Mean Absolute Percentage Error (MAPE). The Tanner function produced the lowest SSE values at all study sites, indicating the smallest aggregate deviation between observed and estimated distributions. In contrast, the Negative Exponential function produced the lowest MAPE values at each school, indicating the lowest relative prediction error. Practically, the findings provide an initial empirical basis for identifying dominant student travel-distance ranges and selecting an impedance function according to the analytical objective. This information can support school accessibility planning, traffic management around school areas, the determination of school service zones, and student transportation planning in Surabaya. The Tanner function is more suitable for representing the aggregate distribution shape, whereas the Negative Exponential function is more appropriate when relative accuracy is prioritised. Detailed planning applications still require additional data on travel modes, travel times, traffic volumes, and road-network conditions.
Hydrodynamic Modelling-Based Prediction and Evaluation of Post-Normalisation Sedimentation in Badeng River with HEC-RAS Zulis Erwanto; Puthut Omar Satriawan; Mohammad Anwar Fathoni
Jurnal Teknologi dan Manajemen Vol 7, No 2 (2026): July
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2026.v7i2.8410

Abstract

The Badeng River in Banyuwangi, Indonesia, has experienced rapid sediment re-accumulation after the 2022 normalization works. This study evaluates post-normalization sedimentation using a one-dimensional HEC-RAS sediment transport model supported by field surveys, sediment sampling, river geometry data, and dredging records. The model predicted annual sediment accumulation of 4,494.88 m³/year at Pakel and 4,380.02 m³/year at Garit. Comparison with dredging records produced a mean absolute error of 1,271.27 m³, corresponding to a deviation of approximately 38–42%. This deviation reflects combined uncertainty from DEM-derived channel geometry, localized excavation records, and excavator-bucket-based dredging volume estimation. Despite this uncertainty, the simulated deposition pattern was consistent with field observations and confirmed substantial sediment recovery within three years after normalization. The results indicate that 1D HEC-RAS is suitable as a decision-support tool for identifying sedimentation-prone reaches, planning dredging intervals, and supporting sediment management in data-limited tropical rivers.
Evaluation of Occupational Safety and Health Implementation on Employee Performance in Limestone Mining Operations Pratama Sandi Alala; Afdi Dama Zafrila; Ayu Setyaning Sayekti Poesoko
Jurnal Teknologi dan Manajemen Vol 8, No 1 (2027): January (In Progress)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2027.v8i1.9265

Abstract

Occupational Safety and Health (OSH) plays a strategic role in improving operational performance in mining industries due to the high level of occupational hazards associated with mining activities. This study evaluates the implementation of Occupational Safety and Health (OSH) practices and their influence on employee performance at PT. Sinar Asia Fortuna, a limestone mining company located in Rembang Regency, Central Java, Indonesia. A mixed-method approach combining qualitative observation and quantitative analysis was employed. Primary data were collected through field observations, interviews, and structured questionnaires distributed to employees. The quantitative data were analyzed using validity testing, multiple linear regression, coefficient of determination, and analysis of variance (ANOVA). The findings indicate that several unsafe behaviors are still observed in mining activities, particularly the inconsistent use of personal protective equipment (PPE), inadequate supervision, and limited employee awareness regarding occupational safety procedures. Regression analysis demonstrates that occupational safety implementation significantly influences employee performance, although behavioral compliance remains the dominant factor affecting the effectiveness of the safety management system. Improving safety culture through continuous supervision, periodic training, and stronger enforcement of safety regulations is expected to reduce workplace risks while enhancing employee productivity. The study provides practical recommendations for strengthening safety management systems in surface limestone mining operations.
Analysis of Full Cost Calculation and Activity-Based Cost Calculation Methods as A Basis for Designing Marketing Strategies for Product Package Pricing Naufal Hanif Pratama; Anindya Rachma Dwicahyani
Jurnal Teknologi dan Manajemen Vol 8, No 1 (2027): January (In Progress)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2027.v8i1.9220

Abstract

Accurate determination of Cost of Goods Sold (COGS) is a key pillar in setting competitive selling prices for the sustainability of the culinary business. However, Depot Sekar Sari faces the challenge of stagnant monthly revenue due to a conventional cost accounting system based on the owner's intuition, where overhead cost components such as electricity, gas, water, and equipment depreciation have not been allocated proportionally to each menu. To overcome this obstacle, this study compares cost calculations using the Full Costing and Activity Based Costing (ABC) methods. The results of data processing show that the ABC method has a higher level of accuracy in revealing cost distortions compared to the traditional method. The traditional method is proven to trigger overcosting on the main chicken menu with a difference of IDR 3,000–IDR 4,000, and undercosting on the rice and beverage menu with a difference of IDR 141–IDR 1,000. The results of this accurate ABC COGS calculation are then integrated with the STP (Segmentation, Targeting, Positioning) marketing framework to formulate a promotional program strategy in the form of 6 variants of product bundling schemes (family and individual packages) with a 10% package discount. This integrative implementation has proven effective in providing a fair pricing structure for customers while stimulating the average daily transaction value (average transactions per transaction) to increase total profitability and overcome Depot Sekar Sari's financial stagnation.

Page 15 of 15 | Total Record : 147

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