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Angkasa: Jurnal Ilmiah Bidang Teknologi
Published by Institut Teknologi Dirgantara Adisutjipto
ISSN : 20859503     EISSN : 25811355     DOI : 10.28989/angkasa
Core Subject : Science,
Computer Science & IT
Arjuna Subject : -
Articles 359 Documents
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Utilizing PLS-SEM and NCA for Understanding Workforce Performance Dicky Suryapranatha; Agus Mansur; Imam Djati Widodo
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.4007

Abstract

This study explores workforce performance in AI-driven environments where individuals operate under dual-role conditions. Existing studies emphasize technological factors while neglecting human behavioral constraints and the distinction between sufficient and necessary conditions. This study addresses this gap by integrating Partial Least Squares Structural Equation Modeling and Necessary Condition Analysis to identify both enabling and limiting factors. Data were collected from 200 manufacturing workers in Indonesia. The results show that engagement level is the main driver of performance (β = 0.519), while self-regulation capability has a strong effect (β = 0.345). NCA revealed that self-regulation capability is the key necessary condition and main bottleneck (d = 0.189), indicating that high performance cannot be achieved without a minimum threshold. AI system support acts as an enabling factor (d = 0.166), while digital capability shows a weak effect (d = 0.065). These findings highlight that performance is not only driven by engagement but is constrained by self-regulatory capabilities. Future research should extend this model using longitudinal data, multi-sector analysis, and additional variables such as organizational support and system complexity to improve model generalizability and robustness
The Optimization of Learning Media Through Augmented Reality to Improve Student Learning Comprehension Saeful Anwar; Tati Suprapti; Yoga Nugraha; Arif Rinaldi Dikananda
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.3869

Abstract

This study presents the development and evaluation of an Augmented Reality (AR) based learning media optimized to enhance students’ comprehension of camera architecture concepts. The AR system was developed using Unity 3D integrated with Vuforia SDK, implementing a marker-based AR approach to ensure stability and compatibility with limited mobile device specifications. The system architecture consists of a mobile AR client, image-marker recognition module, 3D visualization engine, and learning interaction layer designed based on multimedia learning principles and cognitive load theory. A five-stage development framework was employed: planning, material collection, assembly, implementation, and evaluation. The AR media was applied in an undergraduate informatics course involving 30 students, using a one-group pretest–posttest design. Learning outcomes were analyzed using paired t-tests, Wilcoxon tests, normalized gain, and effect size measurements. Results show significant improvements across all cognitive dimensions (p < 0.001), with very large effect sizes (dz = 3.13) and a moderate normalized gain (g = 0.42). The findings indicate that AR provides strong practical impact on higher-order cognitive skills, particularly application and analysis, while highlighting limitations related to measurement instrument validity, absence of a control group, and limited sample generalizability, which will be addressed in future research through experimental comparison and extended system performance testing.
Causal Analysis of Delays and Mitigation Strategies in Self-Managed Construction Projects: Evidence from a Sanitation Program in Indonesia Anton - Wagiono; Anik Ratnaningsih
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.3911

Abstract

 Self-managed construction projects in rural sanitation frequently encounter delays that impact budget effectiveness. This study identifies dominant delay factors and formulates mitigation strategies for the Fiscal Year 2024 Sanitation Project in Pamekasan Regency, where only one of 16 target villages completed the work on schedule. Employing a mixed-method approach, data were collected via structured questionnaires and interviews from 55 purposively sampled key stakeholders. To ensure methodological rigor and mitigate subjective biases in risk assessment, this study proposes a novel integration of Regression Analysis, Pareto Analysis, Fuzzy Failure Mode and Effect Analysis (Fuzzy-FMEA), and SWOT matrix. Regression and Pareto analyses isolated financial and material constraints as the most significant drivers of delay. The application of Fuzzy-FMEA further revealed that financial bottlenecks specifically the administrative latent period between the Regional Budget (APBD) and Community Groups (KSM) are the ultimate root cause, triggering a chain reaction of material and labor shortages. Recommended mitigation strategies include implementing an integrated digital financial monitoring system, allocating mandatory contingency funds, and strengthening contractual clauses for on-site supervision. This cohesive analytical framework offers a scientifically robust approach to enhancing accountability and project timeliness in community-based infrastructure initiatives.Keywords:  Project Delays, Self-managed Sanitation, FMEA, Pareto Analysis, SWOT
Analisis Pengaruh Penambahan Inclined Serration Flat-Plate Pada Trailing Edge Propeller Terhadap Tingkat Kebisingan dan Nilai Thrust Firliandini Pralinda Sundari; Elisabeth Anna Prattiwi; Bangga Dirgantara Adiputra; Eli Kumolosari; Okto Dinaryanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i1.3428

Abstract

The increasing use of drones in Indonesia potentially causes noise pollution due to propeller-generated sound. One widely studied approach to reducing propeller noise is trailing edge modification. Noda et al. (2019) showed that serrated gurney flaps can reduce noise at low RPM with minimal impact on thrust, although their effectiveness decreases at higher RPM. One factor that has not been considered is the serration’s installation angle. This study investigates the effect of adding an inclined serration flat-plate on the noise and thrust of a propeller. Numerical simulations were conducted using the frozen rotor method with the k-ω SST turbulence model and the Ffwocs-William and Hawking acoustic analogy. The results show that the serration increased thrust up to 41.707% at 10,000 RPM. In contrast, the trend of Sound Pressure Level (SPL) towards frequency generally increased, leading to a rise in Overall SPL (OASPL) up to 3.497 dB at 10,000 RPM
Analisis Manufacturing Cycle Effectiveness (MCE) Untuk Meningkatkan Cost Effective Dan Mengurangi Non-Value Added Pabrik Gula Wedomartani Yunaidi Yunaidi; Windi Ardiansyah; Anggi Rediana; Hikmal Abrar; Ridho Nur Waskito; Yotika Abdi Utama; Aldi Aldi; Ratna Sri Harjanti; Azhari Rizal
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.3965

Abstract

Pabrik Gula Wedomartani merupakan pabrik yang mengolah tebu menjadi gula merah cetak yang berlokasi di Sleman, Yogyakarta. Masalah utama yang dihadapi pabrik ini adalah belum optimalnya proses produksi sehingga produktivitas dan efisiensinya masih rendah. Penelitian ini bertujuan untuk mengidentifikasi jenis pemborosan pada jalur produksi gula merah cetak dan memberikan usulan perbaikan untuk meningkatkan efisiensi proses. Pengumpulan data dilakukan melalui observasi langsung menggunakan pendekatan time study selama 5 hari produksi, dengan 1 siklus produksi lengkap diamati setiap hari. Sebanyak 20 aktivitas proses diukur menggunakan stopwatch dan lembar process activity mapping, kemudian divalidasi melalui konfirmasi dengan operator dan pengelola pabrik. Berdasarkan analisis Manufacturing Cycle Effectiveness (MCE), diperoleh nilai efisiensi produksi sebesar 81% dengan persentase pemborosan 19%, yang terdiri atas 3% non-value added (NVA) dan 16% necessary non-value added (NNVA). Pemborosan pada jalur produksi dipengaruhi oleh faktor manusia, mesin, metode, dan material yang saling berkaitan dengan keterbatasan operasional pabrik. Usulan perbaikan diberikan melalui metode Five-M Checklist, meliputi peningkatan keterampilan operator, standardisasi SOP, penambahan feeding conveyor, peningkatan kapasitas gilingan, penggunaan dozing pump, alat bantu pendinginan, serta pengendalian kualitas tebu. Perbaikan tersebut diproyeksikan memiliki potensi meningkatkan MCE menjadi sekitar 86,5%.Kata Kunci: Efisiensi, Five-M Checklist, MCE, Non-value added, Pabrik gula
Analisis Pengaruh Variasi Rasio Komposisi Ampas Tebu Dan Arang Tempurung Kelapa Terhadap Karakteristik Briket Muhammad Firmansyah Suherman; Rico Aditia Prahmana; Achmad Gus Fahmi; Lathifa Putri Afisna; Farid Jayadi; Devia Gahana Cindi Alvian; Pathur Razi Ansyah
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.3990

Abstract

In Indonesia, basic energy needs still depend on natural gas, coal, and petroleum until their availability is decreasing. Bagasse and coconut shell charcoal briquettes offer the best solution as an alternative energy source that is environmentally friendly and abundantly available. This study aims to analyze the effect of variations in the composition of bagasse (AT) and coconut shell charcoal (TK) using tapioca starch adhesive on the characteristics of the briquettes. The compositions tested were 25% AT : 75% TK; 30% AT : 70% TK; 35% AT : 65% TK. The briquettes were evaluated based on parameters such as calorific value, carbon content, ash content, water content, volatile matter content, and combustion rate. The results showed that the briquettes with composition variations of 25% bagasse and 75% coconut shell charcoal had a calorific value of 5721.63 cal/g, carbon content of 64%, ash content of 8%, water content of 7.56%, volatile matter content of 28%, and a combustion rate of 0.19 grams/minute. However, only the water content value that meets SNI 1683/2021 quality 1 is ≤ 8%
Pemodelan Kemenerusan Nikel Laterit Berdasarkan Metode Radial Basis Function (RBF) Di Blok X PT. Stargate Pasific Resources, Sulawesi Tenggara Asep Bukhori; Rangga Bintang Ardaraja; Winarti Winarti; Al Hussein Flowers Rizqi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.3279

Abstract

The significant nickel laterite deposits can be found in Indonesia, especially in the Sulawesi ophiolite belt, which was created by intricate tectonic processes. The purpose of this study is to use the Radial Basis Function (RBF) method to estimate the continuity of the supergene enrichment zone in Block X of PT. Stargate Pacific Resources, Southeast Sulawesi. Collar, survey, assay, and geological logging data from 118 drill holes make up the dataset, which was included into a three-dimensional (3D) modeling system. Leapfrog software is used for spatial modeling, geological and geochemical interpretation, data compositing, and top-cut analysis.The results show that the laterite profile is made up of limonite, saprolite, and bedrock zones, with nickel enrichment occurring primarily in the saprolite and somewhat in the limonite zone. The Ni grade distribution is heterogeneous with a positively skewed pattern, demonstrating the efficiency of the RBF method in capturing non-linear spatial variability when compared to traditional interpolation techniques. Furthermore, the model shows that the continuity of the supergene enrichment zone is primarily oriented west-northwest, as determined by plateau morphology, whereas thinner laterite profiles are associated with rolling hill areas due to greater erosion
Sandwich and Laminated Composite Structures Under Ballistic, Blast and Combined Loading : A Systematic Literature Review Muhammad Abdul Ghofur; Leonardo Gunawan; Satrio Wicaksono; Ditho Ardiansyah Pulungan
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.3993

Abstract

Lightweight protective structures are increasingly required to resist ballistic penetration, blast impulse, and sequential combined threats. However, evidence on laminated and sandwich composites remains fragmented across threat types, architectures, and testing protocols. This systematic literature review followed Preferred Reporting Items for Systematic Reviews and Meta Analysis (PRISMA) framework, searched Scopus for peer-reviewed journal articles published from 2016 to 2025, and retained 36 eligible quantitative studies from 57 records. The synthesis links structural architecture, dominant failure mechanism and performance metrics across laminates and sandwich systems. Evidence indicates that laminated composites generally provide superior ballistic penetration resistance, whereas sandwich composites offer greater blast mitigation. Hybrid skined sandwich architectures emerge as a promising strategy for combined loading, although standardized validation remains limited. The review contributes an architecture-mechanism-metric framework. Overall, deployable protective systems should be selected by threat specific requirements rather than broad architectural superiority claims.
The Influence Of Aquifer Mineralogy On Groundwater Hydrochemistry, Merapi Volcano Southern Slope Area, Sleman Regency, Yogyakarta Special Region Ayu Narwastu Ciptahening; Sari Bahagiarti Kusumayudha; Noppadol Phien-wej
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 2 (2026): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i2.3772

Abstract

People living in the southern slope of Merapi volcano generally consume groundwater for drinking needs. The source is Merapi aquifer that formed of various volcanic deposits, consisting of fractured-weathered breccia, weathered lava, and bouldery sand, with rock petrologically andesitic to basaltic. In one place, groundwater shows good quality, but in another place it can be different, making the people grumble about. Therefore things influencing the groundwater quality needs to be identified suitably, and this study required to be conducted. Objective of the study is to assess the influence of aquifer mineralogy and geochemistry, on groundwater quality. Method being applied was petrological, geochemistry, and hydrochemical assessments. The result shows that in the study area groundwater predominantly contains cations of Ca2+, Mg2+, and Na+, while anions predominantly consist of HCO3, SO42-, and Cl-. Hydrochemical facies are classified into Ca-Mg-HCO3, Ca–HCO3, some samples show mixing type, and Na-Cl facies. Mineral composition of the aquifer strongly influence in the groundwater cation contents, environmental process lead the anion contents, while the Na-Cl facies sample is interpreted caused by domestic waste contamination

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