cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota tangerang,
Banten
INDONESIA
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 373 Documents
 34   35   36   37   38 
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.

Page 38 of 38 | Total Record : 373

 34   35   36   37   38 

Filter by Year

2017 2025


Reset
Filter By Issues
All Issue Vol. 9 No. 2 (2025): NOVEMBER Vol. 9 No. 1 (2025): NOVEMBER Vol. 9 No. 1 (2025): MAY Vol. 8 No. 2 (2025): MAY Vol. 8 No. 2 (2024): NOVEMBER Vol 8, No 1 (2024): MAY Vol. 8 No. 1 (2024): MAY Vol. 8 No. 1 (2024): NOVEMBER Vol. 7 No. 2 (2024): MAY Vol 7, No 2 (2023): NOVEMBER Vol. 7 No. 2 (2023): NOVEMBER Vol. 7 No. 1 (2023): NOVEMBER Vol. 7 No. 1 (2023): MAY Vol 7, No 1 (2023): May Vol. 6 No. 2 (2023): MAY Vol 6, No 2 (2022): NOVEMBER Vol. 6 No. 2 (2022): NOVEMBER Vol. 6 No. 1 (2022): NOVEMBER Vol 6, No 1 (2022): MAY Vol. 6 No. 1 (2022): MAY Vol. 5 No. 2 (2022): MAY Vol. 5 No. 2 (2021): NOVEMBER Vol 5, No 2 (2021): NOVEMBER Vol. 5 No. 1 (2021): NOVEMBER Vol 5, No 1 (2021): MAY Vol. 5 No. 1 (2021): MAY Vol. 4 No. 2 (2021): MAY Vol. 4 No. 2 (2020): NOVEMBER Vol 4, No 2 (2020): NOVEMBER Vol 4, No 1 (2020): MAY Vol. 4 No. 1 (2020): MAY Vol. 4 No. 1 (2020): NOVEMBER Vol. 3 No. 2 (2020): MAY Vol 3, No 2 (2019): NOVEMBER Vol. 3 No. 2 (2019): NOVEMBER Vol. 3 No. 1 (2019): NOVEMBER Vol. 3 No. 1 (2019): MAY Vol 3, No 1 (2019): MAY Vol. 2 No. 2 (2019): MAY Vol 2, No 2 (2018): NOVEMBER Vol. 2 No. 2 (2018): NOVEMBER Vol. 2 No. 1 (2018): MAY Vol. 2 No. 1 (2018): NOVEMBER Vol 2, No 1 (2018): May Vol. 1 No. 2 (2018): MAY Vol. 1 No. 1 (2017): NOVEMBER Vol 1, No 1 (2017): November More Issue