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Andalasian International Journal of Applied Science, Engineering, and Technology
Published by Universitas Andalas
ISSN : -     EISSN : 27970442     DOI : https://doi.org/10.25077/aijaset
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Mechanical Engineering
The Andalasian International Journal of Applied Science, Engineering, and Technology (AIJASET) is an international journal dedicated to the improvement and dissemination of knowledge on applied science, engineering and technologies including energy, environment, industrial, agriculture, civil, transportation, Information and communication and other related sciences and engineering. AIJASET follows new trends and advanced technology for practical applications of appropriate technology.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 209 Documents
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Analyzing the Influence of the Commuter Rail in Decongesting Roads in Nairobi: A Case Study of Syokimau Commuter Rail Service Makarani, AbdulHakim Mwalimu; Osano, Simpson N; Gichaga, Francis J
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): March 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i1.116

Abstract

Nairobi, the capital city of Kenya is experiencing road traffic congestion which gets worse at peak times. Amongst, the interventions tried to help reduce the congestion is the introduction of commuter rail services. However, almost 11 years after commissioning the usage of the service is still very low and the roads are still experiencing congestion. The aim of this study is to determine the influence of the commuter rail service in decongesting the roads in Nairobi. The study made use of questionnaires to determine the stakeholders’ perception on the influence of travel cost, travel time, convenience and reliability in attracting them to the usage of the commuter rail. The results indicate a direct relationship on the influence of travel time, travel cost, convenience and reliability of the commuter rail to decongestion of roads. The improvement of the travel aspects of time, cost, convenience and reliability is expected to attract users to the commuter rail in effect reducing road transport users leading to less congestion on the roads
Enhancing Current Density and Specific Capacitance through Tensile TEMPO, Bacterial Cellulose and Polypirrole Nanocomposites Yunus, Syukri; Manurung, Muhammad Fajar Ruhud; Aulia, Aulia; Arief, Yanuar Zulardiansyah
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): March 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i1.118

Abstract

The researchers developed a bio-composite film material that serves as a substitute for metal. The materials used are TEMPO ((2,2,6,6-tetramethylpiperidine-1-oxyl)), Bacterial Cellulose, and Polypyrrole (Ppy). This research aimed to increase the material's current density and specific capacitance values using the drawing method. Composite nanomaterials are made by oxidizing BC (Bacterial Cellulose) with TEMPO. The resulting TOBC (TEMPO Bacterial Cellulose) material was mixed with Ppy using the in situ method. The mixture is then drawn wet—measurement of current density and capacitance using Cyclic Voltammetry (CV) Testing. The current density and specific capacitance results increased by 542.74% and 754.79% after drawing the nanocomposite material. It is directly proportional to the effects of characteristic testing, which includes SEM, XRD, and FTIR. As a result of the withdrawal of the polypyrrole, it will be more evenly distributed in the composite material, absorbing and coating the nata de coco. The researchers concluded that when the TOBC/Ppy fibers are straighter and denser, they achieve higher current density and capacitance values.
Design Cooling Load on Economy Passenger Train Type K3-438 using Thermodynamic Physics Karlina, Diyajeng Luluk; Mufit, Choirul
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): March 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i1.120

Abstract

Abstract— Factors that influence comfort on trains are thermal comfort factors. Thermal comfort is a thermal interaction between humans and their surroundings that satisfies the human mind. The principle of thermal comfort itself is related to the surrounding body temperature. Because if the human body temperature and the environment have a significant temperature difference, discomfort will occur. Research aims to design an effective air conditioning system to produce a better air supply so that it can overcome the problem of thermal comfort in trains. The first methodology for this research was collecting primary and secondary data. Primary data includes data on train size, construction, type of equipment, and number of passengers. While secondary data is data on design conditions. To determine the value of the cooling load, it is necessary to analyze the heat load in the train which includes sensible heat load and latent heat load. The results of this research obtained a total sensible heat value of 86371.19 Btu/hr. And the total latent heat is 73855.839 Btu/hr. Based on the results of research that has been carried out, it can be Conclusions were drawn from the calculation of the cooling load on the Type K3-438 Passenger Train with a capacity of 94 passengers. It was concluded that the minimum cooling load required was 40412.48 kcal/hr. Keywords: Cooling Load, Thermal Comfort, Passenger Train, Thermodynamic Physics
Noise Reduction System Using Passive Bandpass Noise Filter on Podcast Microphone Fadlan Siregar, Muhammad; Satria, Habib; Irwanto Misrun, Muhammad; Salam, Rudi
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): March 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i1.124

Abstract

The general properties of waves are refraction, reflection, bending (diffraction), interference and polarization. Sound is a form of wave and is in accordance with the law of wave refraction where waves coming from a less dense medium to a denser medium will be refracted closer to the normal line or vice versa. Sound waves easily experience diffraction because sound waves in air have wavelengths of around several centimeters to several meters. Then basically every room, whether you feel it or not, will always have sound. This is inversely proportional to light which has a wavelength of around 500 mm. Therefore, an interference reduction system using a passive bandpass interference filter on the podcast microphone is necessary to reduce interference. Test results carried out by filters used to reduce noise using Passive Band Pass. the waveform is still the original spectrum at 0 Hz – 120 Hz, the original sound conditions and does not cause interference, but interference occurs and filtering Category (Noise %) 10 – 40 low - 98 – 99 high.
Validation Studies a Questionnaire Developed to Measure Incubator Business Technology Performance using PLS-SEM Approach Fithri, Prima; Hasan, Alizar; Syafrizal, Syafrizal; Games, Donard
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 4 No. 1 (2024): March 2024
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v4i1.132

Abstract

This research aims to collect data nationally using a questionnaire based on statements related to the performance factors of the Technology Business Incubator in Indonesia. This research uses the Structural Equation Modeling (SEM) method to test the validity and reliability of adapted scales. There are five stages starting with an outer model test to test the validity and reliability of the questionnaire's feasibility. The population in this research are organizations that are affiliated with the Indonesian Business Incubator Association (AIBI) and Ministry of Research, Technology and Higher Education, including business incubators belonging to ministries, local governments, the private sector and universities, there are 182 Technology Business Incubators in Indonesia. Testing in this research looks at whether the questions in the questionnaire are valid or not by going through two stages of convergent validity and discriminant validity. The first stage is convergent validity that aim of finding out the correlation between indicators and their latent variables. The second stage is discriminant validity which aims to find out whether the latent variable has adequate discriminant value and this was done to find out whether the statement items in the questionnaire were reliable and consistent in measuring the same symptoms in respondents. This research looks at the results of convergent validity analysis to consider the results of factor loading indicators on relevant factors, the results of testing the validity of all factors with a value greater than 0.50, one of which is an AVE value of 0.550, indicating that the indicators in these variables have a strong contribution in measuring the desired construct, and the reliability test of all variables is reliable because it exceeds 0.70, one of which is the facility variable which has a value of 0.858.
Content Validity Evaluation of a Public Transport Service Assessment Tool Integrating Service Quality, Satisfaction, and Behavioral Intentions Yanis, Muhammad; Saleh, Sofyan M; Achmad, Ashfa; Sari, Laina H
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 3 (2025): November 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i3.125

Abstract

Public transportation services are essential in supporting urban mobility and sustainability. However, valid and reliable measurement tools for assessing service quality, user satisfaction, attitudes, and behavioral intentions toward public transportation remain limited. This study aimed to evaluate the content validity of a newly developed assessment instrument designed to measure those constructs. A panel of eight experts representing academia, government, and public transport practitioners was engaged to review the relevance and representativeness of each item using Content Validity Ratio (CVR) and Content Validity Index (CVI). Experts rated each item on a four-point scale of relevance. Items with a CVR value greater than 0 indicating excellent content validity. Two items were revised based on expert recommendations to improve clarity and conceptual accuracy. These findings demonstrate that the instrument is a valid and representative tool for evaluating public transport service quality and user perceptions. Further testing is recommended to establish the construct validity and reliability of the instrument for broader application in transport policy, service evaluation, and behavioral studies.
Solving Heterogenous Fleet Capacitated Vehicle Routing Problem with Time Windows Using Cooperative Hybrid Firefly Algorithm Ananda, Defri; Wirdianto, Eri; Alfandi, Rahmad
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 3 (2025): November 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i3.154

Abstract

The Vehicle Routing Problem with Time Windows (VRPTW) is a widely studied logistics optimization problem, and its complexity increases when heterogeneous fleets are considered. This study proposes the application of the Cooperative Hybrid Firefly Algorithm (CHFA), an extension of the Firefly Algorithm, to solve the Heterogeneous Vehicle Routing Problem with Soft Time Windows (HVRPSTW). The mathematical model was implemented in Python, tested on benchmark datasets, and adapted to a fleet consisting of three vehicle types with different capacities to serve 100 customers. The proposed CHFA achieved feasible routing solutions with a total transportation cost of IDR 17.58 million and a computation time of only 30 seconds. These results demonstrate that CHFA can provide fast and efficient solutions for complex routing problems, making it highly applicable in logistics operations that demand quick decision-making and cost efficiency.
Comparison of Seismic Performance of Shear Wall and Bracing Systems in Residential Flats in Silangkitang Village North Tapanuli Abiyyu, Muhammad Fauzan; Hasibuan , Samsul Abdul Rahman Sidik
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 3 (2025): November 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i3.191

Abstract

Indonesia lies within the Pacific Ring of Fire at the convergence of three major tectonic plates, making earthquake-resistant design a critical challenge for multi-story buildings. Structural systems such as reinforced concrete shear walls and steel bracing are commonly employed to enhance lateral load resistance. This study evaluates and compares the seismic performance of shear wall and bracing systems in a three-story residential flat located in Silangkitang Village, North Tapanuli, using nonlinear static (pushover) analysis conducted in ETABS v18. The analysis results indicate that, in the X-direction, the shear wall structure achieves a total displacement of 66.84 mm with a base shear of 8512.78 kN, whereas the braced structure exhibits a total displacement of 119.19 mm with a base shear of 9773.20 kN. In the Y-direction, the shear wall structure records a total displacement of 166 mm and a base shear of 13,228.69 kN, while the braced structure achieves 173 mm and 8210.53 kN, respectively. These findings demonstrate that, although both systems satisfy the same structural performance level criteria, the shear wall system provides superior lateral stiffness and more favorable displacement characteristics compared to the bracing system.
Front End Design Of Design Asset Sales Information System With Human Centered Design (HCD) Approach Pratiwi, Putu Yudia; Kertiyasa, Made Medhi Premana; Indradewi, I Gusti Ayu Agung Diatri
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 3 (2025): November 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i3.195

Abstract

As digital technology advances, online competition intensifies, yet many SMEs lack reliable, user-friendly systems. SME development often skews toward back-end optimization, while user-centered front ends remain underexplored. This study addresses that gap by designing and evaluating the front end of CV Bello Design’s digital design-asset sales platform and distilling UI/UX decisions transferable to similar SMEs. Using a Human-Centered Design (HCD), we mapped problems with the owner, staff, and past buyers, translated insights into personas and user flows, and iterated prototypes for customer and admin roles. Usability was assessed through user testing measuring effectiveness and satisfaction. In addition, a Heuristic Evaluation was conducted by experts to identify usability issues and opportunities for improvement. Test results show customer effectiveness of 93.75% and admin effectiveness of 95%. Relative efficiency reached 0,02948 goals/second for customers and 0,00939 goals/second for admins. Overall, users reported positive satisfaction. Heuristic findings highlighted needs for a login form, clearer transaction details and history, consistent currency symbols, richer product detail views, clear required-field cues, and an FAQ. Implemented fixes clarified transaction pages, standardized currency symbols, added required-field indicators, and provided an FAQ. Overall, the HCD-based interface measurably improves task completion and offers reusable design patterns for SME, web-based asset-sales platforms.
Pelican Optimization Algorithm (POA)-based Method for Solving the Optimal Capacitor Integration (OCI) Problem Yussif, Abdul-Fatawu Seini; Seini, Toufic; Wilson, Benjamin Egyin
Andalasian International Journal of Applied Science, Engineering and Technology Vol. 5 No. 3 (2025): November 2025
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/aijaset.v5i3.233

Abstract

This study presents a pelican optimization algorithm (POA) based technique for optimizing the integration of capacitor banks in radial power distribution systems. The proposed approach adopts a hybrid approach that combines the loss sensitivity factors (LSF) and the POA to determine the appropriate placement and sizing of the capacitor banks, respectively, for best system performance. The proposed methodology is tested on the IEEE 33-bus distribution system using MATLAB software. The performance for integrating two capacitor banks is compared to that of the particle swarm optimization (PSO) and the genetic algorithm (GA) methods. The proposed POA method achieved a significant improvement in system performance. Specifically, it reduced active power losses (PLoss) by 68.08%, which surpasses the reductions achieved by PSO (61.79%) and GA (57.73%). In the case of reactive power loss (QLoss), the POA-based approach also proved superior with a 39.035% reduction, while PSO and GA-based methods achieved 28.50% and 22.59% reductions, respectively. These results underscore the effectiveness of the POA-based approach in capacitor bank placement and sizing, making it a promising candidate for enhancing voltage profiles and minimizing power losses in radial distribution systems.

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