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FaST : Jurnal Sains dan Teknologi
Published by Universitas Pelita Harapan
ISSN : -     EISSN : 25989596     DOI : -
Core Subject : Science, Social,
Computer Science & IT Environmental Science
Started in 2017, FaST publishes articles in the areas of science and technology, particularly in food technology, biology, electrical engineering, industrial engineering, mathematics and civil engineering. Articles are either reviews and/or research results.
Arjuna Subject : -
Articles 385 Documents
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Pengaruh Penambahan Ekstrak Kulit Buah Naga terhadap Karakteristik Fisikokimia, Aktivitas Antioksidan, dan Sensori Permen Jeli Glukomanan Konjak : [The Impact of Dragon Fruit Peel Extract Addition on The Physicochemical Properties, Antioxidant Activity, and Sensory Attributes of Konjac Glucomannan Jelly Candy] Amrinola, Wiwit; Sekarningrum, Hanandhiya
FaST : Jurnal Sains dan Teknologi Vol. 9 No. 2 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10389

Abstract

Dragon fruit peel is an agro-industrial by-product rich in bioactive compounds such as flavonoids, anthocyanins, phenolics, thiamine, pyridoxine, cobalamin, and carotene, which exert various physiological health effects. This study aimed to evaluate the effect of dragon fruit peel extract on the physical, chemical, functional, and sensory characteristics of konjac glucomannan-based jelly candy. The research was conducted in two stages: (1) extraction and characterization of dragon fruit peel extract, and (2) formulation of jelly candy with four extract concentrations, namely T0 (0%), T1 (9%), T2 (10%), and T3 (11%). Data were analyzed using ANOVA followed by Duncan’s multiple range test. The extract contained alkaloids, flavonoids, tannins, and steroids, with total anthocyanin content of 77.57 mg/L and antioxidant activity of 46.3%. The best formulation was obtained at T3 (11%), which exhibited total anthocyanins of 27.55 mg/L, antioxidant activity (IC50) of  98.44 ppm, total dissolved solids of 60.63 0brix, hardness of 2.31 N, L* is -46,40, a* is 30,81, b* is 14,80, c* is 32,19, H* is 9,35, and an overall sensory acceptance score of 4.68 (neutral–like). The addition of up to 11% dragon fruit peel extract enhanced antioxidant activity of the jelly candy without negatively affecting consumer acceptance. Bahasa Indonesia Abstract: Kulit buah naga merupakan hasil samping yang kaya akan senyawa bioaktif seperti flavonoid, antosianin, fenolik, tiamin, piridoksin, kobalamin, dan karoten yang memiliki efek fisiologis bagi kesehatan. Penelitian ini bertujuan untuk mengetahui pengaruh ekstrak kulit buah naga terhadap karakteristik fisik, kimia, fungsional, dan sensori permen jeli berbasis glukomanan konjak. Penelitian terdiri atas dua tahap, tahap 1 adalah ekstraksi dan karakterisasi ekstrak kulit buah naga, dan tahap 2 adalah formulasi permen jeli dengan empat perlakuan konsentrasi ekstrak kulit buah naga: T0 (0%), T1 (9%), T2 (10%), dan T3 (11%). Analisis yang dilakukan meliputi analisis fisik, analisis kimia, analisis fungsional, dan analisis sensori. Data dianalisis menggunakan ANOVA dan uji lanjut Duncan. Hasil penelitian menunjukkan bahwa ekstrak kulit buah naga mengandung alkaloid, flavonoid, tanin, dan steroid, dengan total antosianin 77,57 mg/L dan aktivitas antioksidan 46,3%. Formula terbaik diperoleh pada perlakuan T3 (11%) dengan total antosianin 27,55 mg/L, aktivitas antioksidan 38,28%, total gula 60,63%, kekerasan 2,31 N, L* sebesar -46,40, a* sebesar 30,81, b* sebesar 14,80, c* sebesar 32,19 dan H* sebesar 9,35, dan nilai penerimaan sensori keseluruhan 4,68 (kategori netral–suka). Penambahan ekstrak kulit buah naga hingga 11% meningkatkan kandungan senyawa bioaktif dan aktivitas antioksidan tanpa menurunkan penerimaan konsumen.
DMAIC Based Approach for Analyzing and Controllling Defective Product in Rubber Clutch Damper Product: [DMAIC Based Approach for Analyzing and Controllling Defective Product in Rubber Clutch Damper Product] Nata, Christopher; Tandika, Tegar; Rahayu, Priskila Christine
FaST : Jurnal Sains dan Teknologi Vol. 9 No. 2 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10393

Abstract

Rejects represent a major quality issue in the production process. If not effectively mitigated, they can increase production costs, disrupt process flow, and reduce customer satisfaction. This study aimed to minimize product rejection in rubber clutch damper manufacturing by applying the Six Sigma DMAIC (Define, Measure, Analyze, Improve, Control) methodology. In the Define phase, Critical to Quality (CTQ) characteristics were identified to determine key improvement priorities. The Measure phase involved data collection to calculate Defects per Million Opportunities (DPMO), sigma level, and the construction of a Pareto chart to highlight the dominant sources of defects. Subsequently, the Analyze phase employed Failure Mode and Effects Analysis (FMEA) to evaluate the Severity, Occurrence, and Detection of potential failures, leading to the determination of the Risk Priority Number (RPN) as a basis for improvement prioritization. In the Improve phase, corrective actions targeting the highest RPN factors were implemented, followed by the Control phase, which established sustainability through One Point Lessons and Standard Operating Procedures (SOPs). The implementation of the DMAIC framework resulted in a substantial improvement in process capability, indicated by an increase in sigma level from 4.11 to 4.58, and a reduction in the total production rejection rate from 1.51% to 0.31%. A paired t-test confirmed a statistically significant difference between pre- and post-improvement rejection rates (t = 61.63, p < 0.0001), leading to the rejection of the null hypothesis. These findings demonstrate that the applied improvements effectively reduced product defects and achieved a total rejection rate below the company’s management target of 0.40%. The study confirms the effectiveness of the DMAIC approach in enhancing product quality and operational efficiency within rubber component manufacturing. Bahasa Indonesia Abstract: Permasalahan reject merupakan salah satu isu krusial dalam proses produksi yang apabila tidak segera ditangani, dapat berdampak pada peningkatan biaya produksi, keterlambatan pengiriman antarproses, serta penurunan tingkat kepuasan pelanggan. Penelitian ini bertujuan untuk menurunkan tingkat reject pada produk rubber clutch damper melalui penerapan metodologi Six Sigma dengan pendekatan DMAIC (Define, Measure, Analyze, Improve, Control). Pada tahap Define, dilakukan identifikasi Critical to Quality (CTQ) untuk menentukan karakteristik yang berpengaruh signifikan terhadap kualitas produk. Tahap Measure meliputi pengumpulan data produksi guna menghitung nilai Defects Per Million Opportunities (DPMO), tingkat sigma, serta penyusunan diagram Pareto untuk mengidentifikasi jenis cacat dengan kontribusi terbesar terhadap total reject. Selanjutnya, tahap Analyze dilaksanakan menggunakan metode Failure Mode and Effects Analysis (FMEA) dengan penilaian terhadap parameter Severity, Occurrence, dan Detection, yang dikalikan untuk memperoleh nilai Risk Priority Number (RPN) sebagai dasar prioritas tindakan perbaikan. Tahap Improve difokuskan pada penerapan solusi korektif terhadap faktor penyebab dengan nilai RPN tertinggi, sedangkan tahap Control menitikberatkan pada keberlanjutan hasil perbaikan melalui penyusunan One Point Lessons (OPL) dan Standard Operating Procedures (SOP). Penerapan metodologi DMAIC menghasilkan peningkatan kapabilitas proses dengan kenaikan nilai sigma dari 4,11 menjadi 4,58, serta penurunan rejection rate total produksi dari 1,51% menjadi 0,31%. Hasil uji paired t-test menunjukkan perbedaan yang signifikan antara tingkat rejection rate sebelum dan sesudah perbaikan (t = 61,63; p < 0,0001), sehingga hipotesis nol ditolak. Dengan demikian, penerapan DMAIC terbukti efektif dalam menurunkan tingkat reject secara signifikan hingga di bawah target manajemen sebesar 0,40%, sekaligus meningkatkan kualitas produk dan efisiensi proses produksi.
High-Reliability Teams at Sea: The Role of Psychological Safety, Human–System Interaction, and Workload in Error Reporting Behavior among Offshore Workers Gomargana, Chrysan; Wibowo, Kevin Aprilio; Widjajakusuma, Jack
FaST : Jurnal Sains dan Teknologi Vol. 9 No. 2 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10416

Abstract

Offshore oil and gas operations demand high reliability under extreme physical and psychological conditions. Despite robust engineering systems, many accidents still stem from human and organizational factors. This study examines the role of psychological safety, human–system interaction, and workload in predicting error reporting behavior among offshore workers. A quantitative, cross-sectional design was applied using validated self-report scales: the Psychological Safety Scale (Edmondson), System Usability Scale (SUS), NASA Task Load Index (NASA-TLX), and an adapted Error Reporting Behavior Scale. Data were collected from 188 offshore workers in Indonesia through online questionnaires. Multiple linear regression analysis revealed that psychological safety (β = .38, p < .001) and human–system interaction (β = .27, p < .001) significantly and positively predicted error reporting behavior, while workload showed a significant negative effect (β = −.23, p < .001). The model accounted for 36% of the variance in error reporting (R² = .36). These findings indicate that workers are more likely to report errors when they feel safe to speak up, perceive systems as user-friendly, and experience manageable workloads. The study highlights the need for integrated interventions that simultaneously foster psychological safety, ergonomic system design, and balanced workload management to enhance proactive safety behavior in offshore environments. This research contributes to the intersection of industrial–organizational psychology and human factors engineering, emphasizing that safety performance in high-reliability organizations relies on both social and technological resilience. These findings align with Sustainable Development Goal 9 (Industry, Innovation and Infrastructure), reinforcing that resilient and sustainable industrial systems require the integration of human factors into safety management and system design.
3D-Printed Porous Tantalum Scaffolds for Bone Regeneration: A Narrative Review of Structural Design, Biological Performance, and Clinical Applications Michael Lizar; Xingshuang Ma
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10486

Abstract

Bone fractures remain a major clinical challenge in orthopedic surgery, requiring biomaterials that closely mimic the structural and mechanical properties of native bone. Although titanium and its alloys are widely used, their limited porosity and elastic modulus mismatch may compromise osseointegration and long-term implant stability. Three-dimensional (3D)-printed porous tantalum (Ta) scaffolds have emerged as promising alternatives due to their high biocompatibility, corrosion resistance, and osteoconductive potential. This narrative review comprehensively evaluates the structural design, additive manufacturing strategies, mechanical performance, biological interactions, and clinical applications of 3D-printed porous Ta scaffolds for bone regeneration. Particular attention is given to scaffold architecture, pore geometry optimization, and scaffold–cell interactions, including the incorporation of bone marrow–derived mesenchymal stem cells (BMSCs). Advances in additive manufacturing techniques, such as Selective Laser Melting and Laser Engineered Net Shaping, enable the fabrication of highly interconnected porous structures with bone-mimetic mechanical properties. Evidence from in vitro and in vivo studies indicates that pore sizes of 400–600 µm and porosity around 80% provide a favorable microenvironment for cell adhesion, proliferation, and osteogenic differentiation. Functionalization strategies and activation of osteogenic signaling pathways further enhance mineralization and interfacial integration. Overall, the integration of 3D-printed porous Ta scaffolds with regenerative cellular strategies represents a promising approach for bone defect repair, spinal fusion, and joint reconstruction. Continued optimization of scaffold design and validation through long-term clinical studies are essential to facilitate translational application.
Asesmen Kualitas RTH Publik Menggunakan Indeks Vegetasi di Taman Hutan Raya Ir. H. Djuanda Kota Bandung Muhammad Alwan Faris Fadlirullah Raden, Sutadiwangsa; Adytia Heru Nugraha; Ammar Muhammad Nabil; Yulia Asyiawati
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10492

Abstract

Urban forest ecosystems are increasingly subject to significant anthropogenic pressures; however, the resulting ecological responses often exhibit a delayed manifestation. The Ir. H. Djuanda Forest Park (Tahura) serves as a vital urban conservation area in Bandung,  Indonesia, which has experienced a massive surge in tourist volume. This study aims to analyze the "lag effect" of visitor pressure on vegetation quality dynamics over the 2015–2025 period. A descriptive quantitative approach was employed, integrating spatial analysis via Google Earth Engine (GEE) to extract Normalized Difference Vegetation Index (NDVI) values from Sentinel-2A satellite imagery. Statistical analyses, including Spearman correlation and linear regression, were conducted with time-lag intervals ranging from 0 to 5 years to identify the relationship between annual visitor numbers and the extent of high-density vegetation. The findings reveal no significant correlation at lag 0 (ρ = –0.12; p > 0.05). Conversely, a significant negative correlation emerged at lag 3 (ρ = –0.61; p < 0.05) and reached its peak at lag 5 (ρ = –0.78; p < 0.01). These results demonstrate a threshold of vegetation resistance, where physical degradation only becomes spectrally manifest after several years of cumulative disturbance. This study recommends the implementation of visitor management policies based on environmental carrying capacity that incorporate temporal variables to ensure the long-term sustainability of the Tahura Ir. H. Djuanda ecosystem.
Effect of Steaming Time on The Protein Quality and Functional Properties of Soybean Paste Natasya Crisly; Lucia Crysanthy Soedirga
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10884

Abstract

Thermal processing is essential for enhancing the nutritional quality and protein digestibility of soybeans. Steaming, which uses hot vapor to minimize direct contact between the food and water, as in boiling, thereby better preserves nutrient content. However, excessive heating can decrease the quality and functional properties of the protein; therefore, the selected cooking time, specifically the steaming time, must be determined. This study investigated the effects of varying steaming times (25, 40, and 55 minutes) on the protein quality—specifically protein content and in-vitro protein digestibility—and functional properties, including emulsion stability and water holding capacity, of soybean paste. Results indicated that prolonged steaming significantly reduced both protein quality and functional properties. Extended thermal exposure resulted in excessive protein denaturation and aggregation, thereby disrupting the structural integrity required for effective water binding and emulsion stabilization. The selected steaming time was 25 minutes, yielding a protein content of 29.62 ± 1.10% and an in vitro protein digestibility of 44.40 ± 0.36%. Furthermore, at this selected steaming time, the soybean paste exhibited the highest emulsion stability and water holding capacity values of 92.79±1.76% and 71.25±1.77%, respectively. These findings support SDG 2 (Zero Hunger), SDG 3 (Good Health and Well-being), and SDG 12 (Responsible Consumption and Production) by establishing a resource-efficient method for producing high-quality, sustainable plant-based proteins. This 25-minute steaming duration establishes a standardized approach to enhancing the nutritional and functional profiles of soybean-based ingredients.
Pemanfaatan Kitosan Kepiting Bakau (Scylla serrata) dan Ion Ag+ dalam Pembuatan Lapisan Antibakteri pada Casing Handphone Adolf J.N. Parhusip; Esli Yunita Sari; Donna Calistalia Ruslim; Jessica Adelia Tiono
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10886

Abstract

Phone cases are essential for protecting mobile phones from dirt and the risk of damage. However, it may also serve as reservoirs for bacterial growth, including Staphylococcus aureus, due to frequent handling and environmental exposure. To address this issue, an antibacterial coating was developed using an epoxy resin matrix incorporated with chitosan derived from Scylla serrata and silver ions (Ag⁺) obtained from AgNO₃ as active antibacterial agents. This study aimed to evaluate the antibacterial effectiveness of Scylla serrata chitosan and Ag⁺ ions and to determine the optimal chitosan-to-Ag⁺ ratio for inhibiting Staphylococcus aureus growth on coated surfaces. An in vitro antibacterial assay was performed using the agar well diffusion method on Nutrient Agar by applying 75.36 µL of chitosan–AgNO₃ solutions at ratios of 0:1, 1:0, 1:1, 2:1, and 1:2, with epoxy resin in 99.9% absolute ethanol as the negative control and 100 ppm amoxicillin as the positive control. Antibacterial activity was assessed by measuring inhibition zone diameters, and data were analyzed using tests of normality and homogeneity followed by one-way ANOVA and the Games–Howell post hoc test. The results demonstrated that both chitosan and Ag⁺ ions exhibited significant antibacterial activity, with the highest inhibition observed for the 0:1 and 1:0 ratios, while the combined chitosan–Ag⁺ formulation at a 1:1 ratio showed the most effective synergistic antibacterial performance against Staphylococcus aureus.
Analisis Risiko Beban Kerja dengan Metode NIOSH Lifting Equation dan Rapid Entire Body Assessment pada Aktivitas Dumping Aditif di PT X Dani Hermawan; Agustina Christiani
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10891

Abstract

Additive dumping activities at PT X are characterized by manual, repetitive lifting of sacks and frequent bending postures, which may increase the risk of developing Musculoskeletal Disorders (MSDs). Based on the results of the Cornell Musculoskeletal Discomfort Questionnaire (CMDQ), the predominant area of reported discomfort was the lower back. This study aimed to evaluate workload risks using the NIOSH Lifting Equation and the Rapid Entire Body Assessment. The initial assessment indicated a high-risk lifting task, with a Composite Lifting Index of 1.1307, exceeding the recommended threshold of 1.00, and a REBA score of 10, signifying a high level of risk. An ergonomic intervention involving the implementation of a Manual Hydraulic Stacker Forklift was proposed to elevate the initial load to waist height, thereby improving worker posture. Simulation results of the proposed intervention demonstrated a reduction in the lifting index to 0.88 and a substantial decrease in the REBA score to 3, corresponding to a low-risk category. These findings underscore the effectiveness of material handling equipment in mitigating musculoskeletal risk factors.
Analisis Sistem Antrian di Indomaret Fresh Bitung dengan Pendekatan Teori Antrian dan Simulasi Nanda Dwi Putra Purba; Sylvia Sylvia; Rifqi Bilal Kumara; Yoga Rendika; Yoga Putranto; Nuryudha Darmawan
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10892

Abstract

This study analyzes the performance of the cashier queueing system at Indomaret Fresh Bitung using observational data on inter-arrival times and service times, integrated with simulation modeling. The data collected indicate that customer inter-arrival times follow an exponential distribution. The analysis demonstrates that shorter inter-arrival times substantially increase waiting times and server utilization. During peak hours, an average inter-arrival time of 1.21 minutes results in an average waiting time of 0.769 minutes and a server utilization rate of 60%, indicating that the cashier operates near maximum capacity. In contrast, during non-peak hours, a longer average inter-arrival time of 1.832 minutes reduces system workload, leading to a shorter average waiting time of 0.341 minutes and increasing the probability of server idleness to 62.5%. Combined simulation results reveal a relatively balanced operational condition with an overall utilization level of 50%. Overall, the findings confirm that shorter inter-arrival times increase the likelihood of queue formation; therefore, optimal resource allocation during peak periods is necessary to maintain service efficiency.
Sistem Monitoring Schedule Compliance untuk Pengendalian Shortage Material pada Proses Produksi Extruder Daffa Aji Firmansyah; Priskila Christine Rahayu
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10895

Abstract

Compliance schedule management for extruder machines in manufacturing environments is often still performed manually, leading to reporting delays, recording errors, and limited visibility of schedule adherence and material readiness. This study aims to develop a digital-based compliance schedule monitoring system to improve the effectiveness of production schedule control, material availability tracking, and detection of non-conforming schedules. The system was developed using the Rapid Application Development (RAD) approach, which includes requirement planning, system design (use case diagram, data flow diagram, and entity relationship diagram), prototype development, and implementation testing in an operational environment. The proposed system integrates production schedule data, material usage, material shortage information, and compliance status into a centralized dashboard displaying real-time performance and compliance indicators. Testing results show a significant reduction in monitoring time from 38.63 minutes in the manual system to 0.61 minutes using the proposed system, resulting in a time efficiency improvement of 98.42%. Furthermore, the system enhances information transparency, decision-making speed, and reporting accuracy. Therefore, the developed system is effective in supporting data-driven operational control in manufacturing production processes.

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