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Dedi Purwanto Indra Kusuma
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RESWARA: Jurnal Riset Ilmu Teknik
Published by Lembaga Penelitian dan Pendidikan (LPP) Kalibra
ISSN : -     EISSN : 30259444     DOI : https://doi.org/10.70716/reswara
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
RESWARA: Jurnal Riset Ilmu Teknik is a leading scholarly platform that examines the strategic role of engineering disciplines in advancing the Sustainable Development Goals (SDGs). The journal is dedicated to publishing recent research, innovations, and engineering solutions that support sustainable development. The editorial board welcomes manuscripts based on theoretical frameworks and empirical research. The journal scope covers scientific knowledge and research-based information, including applied research and recent developments in engineering research and development. The primary focus includes Civil Engineering and Spatial Planning, Industrial Engineering, Electrical Engineering and Informatics, Earth Science Technology, and Naval Architecture. All manuscripts published in RESWARA undergo a double-blind peer review process. The final decision on manuscript acceptance rests with the Editorial Board, based on recommendations from independent peer reviewers.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 128 Documents
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Evaluation of Brushed Stainless Steel 430 Inventory Control Using The EOQ Model at PT. X Tri Ananda Putri; Hery Irwan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.729

Abstract

Raw material inventory control is essential for maintaining production continuity and improving cost efficiency in manufacturing companies. This study analyzes the optimization of stainless steel 430 brushed inventory at PT X using the Economic Order Quantity (EOQ) method. A descriptive quantitative approach with a case study design was employed. The analysis used annual demand, ordering cost, holding cost, lead time, and the company’s current ordering policy. The annual demand was 12,000 units, with an ordering cost of IDR 350,000 per order and a holding cost of IDR 25,000 per unit per year. Under the company’s existing policy of ordering 1,000 units per order, the total inventory cost reached IDR 16,700,000 annually. The EOQ analysis determined an optimal order quantity of 580 units, reducing the total inventory cost to IDR 14,491,379 and generating annual cost savings of IDR 2,208,621 (13.23%). The reorder point was calculated at 280 units based on an average daily demand of 40 units and a lead time of seven days. These findings indicate that the EOQ model provides a more efficient basis for inventory ordering decisions at PT X under deterministic assumptions, including constant demand, fixed lead time, and stable ordering and holding costs. However, the results are limited to deterministic inventory conditions and may not be directly applicable to environments with demand or lead-time uncertainty.
Assessment of Building Envelope Thermal Performance Using Overall Thermal Transfer Value (OTTV) at Labuang Baji Hospital, Makassar Syamsuddin Mustafa; Syamfitriani Asnur; Andi Besse Opu
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.730

Abstract

Hospitals are public service buildings with high energy consumption because they operate continuously and require stable thermal comfort. One aspect that affects building energy efficiency is the performance of the building envelope in resisting heat transfer from the outdoor environment. This study examines the Overall Thermal Transfer Value (OTTV) as an indicator of energy efficiency in Building B of Labuang Baji Hospital, Makassar. The assessment was conducted through field observation and measurement of building-envelope parameters, including façade orientation, wall area, glazing area, material type, thermal transmittance, shading conditions, and solar radiation entering the indoor spaces. OTTV analysis was carried out on the fourth, fifth, and sixth floors with reference to SNI 6389:2020, which specifies a maximum OTTV limit of 35 W/m². The results indicate that the average OTTV values ranged from 81.04 W/m² on the fourth floor to 85.93 W/m² on the fifth floor, all of which substantially exceeded the national standard. The northwest façade consistently recorded the highest average OTTV values (92.80–94.03 W/m²), whereas the south façade exhibited the lowest values (69.00–74.38 W/m²), although these also remained well above the allowable limit. These findings demonstrate that the existing building envelope has not yet achieved the required level of thermal efficiency and contributes to increased cooling loads. The results also identify the northwest façade and upper floors as priority targets for energy retrofit interventions. Recommended improvement measures include the use of high-performance glazing, the installation of external shading devices, optimization of the window-to-wall ratio, and improved wall insulation to reduce heat gain and enhance overall building energy efficiency.
Studi Eksperimental Pengaruh Ketinggian dan Sudut Kemiringan Modul Fotovoltaik Terapung terhadap Perilaku dan Potensi Degradasi Termal pada Panel Surya Muhammad Reza Fathoni; Bambang Arip Dwiyantoro
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.733

Abstract

Floating Photovoltaic (FPV) systems enhance performance through the natural cooling effect of water bodies, yet module operating temperature remains a critical factor affecting electrical performance and long-term reliability and is strongly influenced by physical configuration. This study analyzes the effects of module height above the water surface (250, 500, and 750 mm) and tilt angle (5°, 15°, and 25°) on photovoltaic cell temperature (Tmod) and the Arrhenius Acceleration Factor (AF) as an indicator of thermal degradation potential. Measurements were conducted on an FPV system at ITS Graha Pond, Surabaya, Indonesia, from 09:00 to 15:00 local time at 30-minute intervals, analyzed using the Taguchi L9(3²) Orthogonal Array, Signal-to-Noise (S/N) ratio, Main Effect Analysis (MEA), and Analysis of Variance (ANOVA). Results show Tmod ranged from 32.91°C to 54.96°C, yielding AF values between 3.9488 and 5.9110. The optimal configuration (A₃B₃: 750 mm height, 25° tilt) produced Tmod = 48.10°C and AF = 4.0524. ANOVA identified module height as the most dominant factor, contributing 72.92% to Tmod variation and 68.93% to AF variation, statistically significant at α = 0.05. Tilt angle contributed 13.82% (Tmod) and 16.25% (AF) but was not significant. These findings underscore the importance of selecting appropriate FPV physical configurations to reduce operating temperature, enhance energy efficiency, and extend system service life in tropical climates.
Mechanism-Driven Performance Limitations in FASnI₃ Perovskite Solar Cells: A SCAPS-1D Study of the ITO/ZnO/FASnI₃/NiO/Pt Architecture Abi Nurhidayat; Bambang Soegijono
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.736

Abstract

Lead-free FASnI₃ perovskite solar cells offer a promising route toward environmentally benign photovoltaics, yet their practical performance remains constrained by unresolved loss mechanisms and overly idealized simulation assumptions. This study presents a mechanism-resolved SCAPS-1D analysis of the ITO/ZnO/FASnI₃/NiO/Pt architecture by evaluating the contributions of bulk recombination, interface recombination, resistive losses, and temperature effects within a unified framework. A graded realistic-defect methodology is introduced to bridge the gap between near-ideal simulations and fabrication-relevant conditions. Comprehensive parameter sweeps were performed for absorber energetics, doping concentration, thickness, bulk and interface defect densities, transport-layer properties, series resistance, operating temperature, and back-contact work function, while incorporating Shockley–Read–Hall, radiative, and Auger recombination mechanisms. Under near-ideal low-defect conditions, the optimized device achieves V, mA c, FF = 89.04%, and PCE = 31.90%, representing an upper-bound estimate within the simplified optical model. Under realistic conditions, the efficiency decreases systematically to 28.80% for the typical scenario, 22.57% for the moderate scenario, and 15.06% for the pessimistic scenario. The results establish a clear hierarchy of performance-limiting mechanisms, with bulk and interface Shockley–Read–Hall recombination dominating the efficiency gap, followed by series resistance and thermal effects. These findings provide a transferable mechanism-based framework and practical design guidelines for improving high-efficiency, lead-free FASnI₃ perovskite solar cells beyond idealized simulation conditions.
Evaluation of Floor Plates in the Bima City Regional General Hospital Building Muhammad Syaiful; Wira Setiawan; Sulis Syaputri
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.739

Abstract

Floor slabs are the main structural elements that withstand the gravitational load of multi-storey buildings. This study aims to evaluate the deflection of the roof floor plate of the Bima City Regional General Hospital (RSUD) building to ensure the safety and adequacy of the structure based on service requirements. The analysis was performed numerically using SAP2000 v22 software with Shell-Thin elements. Structural data includes 8 m × 8 m slabs, 120 mm thick, concrete quality f'c = 25 MPa, fy steel quality = 420 MPa, and two-layer D10-150 reinforcement. Loading refers to SNI 1727:2020 and PPIUG 1983, with a total dead load of 4.16 kN/m² and a live load of 0.96 kN/m². The permissible deflection is calculated based on SNI 2847:2019 as δ_allow = L/240 = 33.33 mm. The results of the SAP2000 analysis showed a maximum deflection of 3.08 mm, which was far below the permissible limit, so that the roof floor plate of the Bima City Hospital was declared safe and met the requirements of the service limit country.
Pengembangan Model Analisis Faktor Resistensi untuk Rekomendasi Peningkatan Niat Bermain Game Digital Menggunakan PLS-SEM Chamdana Taqie Samboro; Mudjahidin Mudjahidin
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.741

Abstract

There is a lot of research on the intention to play games, but rarely does it look at the barriers that make someone reluctant and resistant to playing games. This study aims to: develop barrier factors (interpersonal, intrapersonal and structural factors) by considering health factors that cause someone to refuse to play games using a sample of 230 respondents in Malang, Indonesia, who have stopped playing games for at least the last 3 months, using a Google form. The analysis in this study used PLS-SEM to conduct an outer test on the questionnaire and an inner test on the path model and test the hypothesis. The findings proved that: all barriers, including interpersonal, intrapersonal, structural, and health barriers, trigger significant resistance and then reduce interest in playing digital games. These findings provide information and recommendations for game developers to design game designs and features that are more inclusive, balanced, and support the physical and mental health of users, in order to minimize resistance in playing digital games.
Analysis of The Impact of on-Street Parking on Traffic Performance on One-Way Streets (Case Study: Gajah Mada Street, Bima City Isnandi Isnandi; Sharwanda Asfarina; M. Deta Zulfikar Rahman
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.743

Abstract

The continuous growth of population and motor vehicle ownership in Bima City has not been balanced by adequate road infrastructure development, causing traffic congestion, especially on strategic one-way national roads such as Jalan Gajah Mada, where on-street parking activities reduce the effective road width and disturb traffic flow. This study aims to identify the traffic volume passing through Jalan Gajah Mada and to analyze the influence of on-street parking on the traffic performance of this one-way road segment. A quantitative descriptive method was applied, collecting primary data through three days of field surveys covering morning, midday, and afternoon periods, then analyzed using the Indonesian Highway Capacity Manual (MKJI) 1997 to calculate traffic volume, side friction, free flow speed, road capacity, degree of saturation, and level of service. Results indicate the highest peak-hour volume reached 877.1 pcu/hour on Monday afternoon, dominated by motorcycles, with parking and stopping vehicles (PSV) contributing the largest weighted side friction frequency (200 of 417.3), classifying the segment as medium side friction. This condition reduced free flow speed to 42.12 km/hour and road capacity to 2,161 pcu/hour, producing a degree of saturation of 0.41 with level of service B, indicating stable flow despite noticeable parking-related friction. In conclusion, on-street parking measurably affects traffic performance, though current conditions remain within tolerable capacity. Local authorities are recommended to enforce stricter parking regulations, including peak-hour on-street parking prohibition and provision of off-street alternatives, to prevent future performance decline. Further research should extend observation periods and include forecasting simulations.
Analisis Kebutuhan Air Bersih dan Pemetaan Potensi Mata Air Wilayah Kecamatan Siotapina Kabupaten Buton Aswad Asrasal; Slamet Imam Wahyudi; Henny Pratiwi Adi
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.775

Abstract

Clean water demand is a key consideration in planning drinking water supply systems, particularly in areas experiencing population growth and relying on springs as raw-water sources. This study analyzes projected clean water demand through 2035 and maps spring-water potential as a basis for SPAM development in Siotapina District, Buton Regency. A quantitative approach was applied using population data, field surveys conducted in March 2026, spring-discharge measurements using a current meter, and spatial analysis with ArcGIS Pro. Population and water demand were projected using the geometric method, including domestic and non-domestic demand, water losses, maximum-day demand, and peak-hour demand. The population is projected to increase from 17,448 in 2026 to 19,910 in 2035, with peak-hour demand reaching 43.83 L/s. Ten springs were identified with a combined measured discharge of 300.27 L/s. Baahuwu (92 L/s), Waikobi 2 (64 L/s), and Lialamana 1 (57.5 L/s) individually exceed the projected peak-hour demand. The integration of demand projections and spatial information indicates that these springs have strong quantitative potential as primary raw-water sources, while lower-discharge springs may support an integrated supply system. The results provide a quantitative and spatial basis for further technical planning of a sustainable SPAM in Siotapina District.

Page 13 of 13 | Total Record : 128

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