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Widi Aribowo
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widiaribowo@unesa.ac.id
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+62811307761
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vubeta@unesa.ac.id
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Jl. Prof. Moch Yamin, Ketintang, Kec. Gayungan, Surabaya, Jawa Timur 60231
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Vokasi UNESA Bulletin of Engineering, Technology and Applied Science
Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 30640768     DOI : https://doi.org/10.26740/vubeta.v1i1
Core Subject : Science, Engineering,
Computer Science & IT Engineering Mechanical Engineering Transportation
Vokasi Unesa Bulletin Of Engineering, Technology and Applied Science is a peer-reviewed, Quarterly International Journal, that publishes high-quality theoretical and experimental papers of permanent interest, that have not previously been published in a journal, in the field of engineering, technology, and applied sciences that aim to promote the theory and practice of Engineering, Technology And Applied Science.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 69 Documents
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Design of Automatic Battery Charger Using Forward DC-DC Converter for Solar Home Energy Vidia Laksmi B, Nur; Muhammad Syahril Mubarok; Fithrotul Irda Amaliah; As’ad Shidqy Aziz; Daeng Rahmatullah; Dimas Herjuno; Habibi, Muhammad Afnan
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 1 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i1.35817

Abstract

The utilization of solar energy as a renewable and environmentally friendly energy source, which is inexhaustible, is an ideal solution to meet the growing demand for electricity. Solar Home Energy refers to a house powered by solar energy. The solar energy is subsequently stored in batteries using a battery charger. In this paper, a forward DC-DC converter is used as a battery charger to supply power to a self-sufficient house from solar energy, stored in a 96 V 45 Ah battery. A fuzzy logic controller is employed to regulate the output of the forward DC-DC converter, ensuring a constant charging voltage according to the set point. The output of this project is designed for 110 V 4.5 A; however, in practice, the forward DC-DC converter only achieved a charging voltage of 100.5 V, resulting in an error of 8.63% from the planned value. Additionally, the charging current reached 1.4 A, leading to a significant error of 63.89% from the planned charging current.
Designing of An Integrated Port Development Planning Model: Application to The Three Main Cameroonian Ports NDZIE BITUNDU, Christian Alain Bienvenu; WOUNBA , Jean François; BWEMBA , Charles; FONDZENYUY, Stephen Kome
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 1 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i1.35876

Abstract

The Chad and the Central African Republic countries threatened to find an alternative to Cameroon's ports because of the low accessibility and inefficiency of these ports. The objective of this study in its relevance is to characterize the current hinterland of Cameroonian maritime ports, to analyze the dynamics of the flow of goods in the port hinterland of Cameroon, and to make recommendations for improving the National Port Master Plan to guarantee the increased development of Cameroonian maritime ports. The Huff model integrated into the Spatial Interaction Model (SIM) is used to geographically delimit the economic hinterland of Cameroon's seaports. The results of the study highlight two key points: (1) the significance of integrating the development of Cameroon’s port hinterland into the national port planning strategy to enhance the growth of the country’s maritime ports. (2) Each port in Cameroon should pay more attention to the expansion of the hinterland. This study introduces methods integrating the SIM approach for practical hinterland exploration with the Bayesian model and mutual information for analyzing hinterland needs. Additionally, it offers recommendations for a seaport development planning model. This article broadens the use of the SIM Bayesian model with mutual information, which can easily be adapted to other scenarios.
Analysis of Microbial and Physio-Chemical Attributes in Fresh, Sun-Dried, and Oven-Dried Tomatoes (Solanum Iycopersium) Omorodion, Nnenna Jennifer; Richmas Obiobu, Euboniso
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 1 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i1.35906

Abstract

This study accessed the microbial and physiochemical qualities of fresh, oven-dry, and sun-dry tomatoes to comprehensively understand the impact of drying methods on the quality and safety of this widely consumed fruit. Microbial and physiochemical analysis were done using standard methods. It revealed the variations in microbial population with the results showing the total viable bacterial count ranged from 1.3×106cfu/g to 2.7×106cfu/g with fresh tomato (FT) slices having the highest value (2.7×106cfu/g). Sun-dried tomatoes (SD) (2.3×106cfu/g), oven-dried at 40°C (1.6×106cfu/g) and oven-dried at 60°C (1.4×10-6cfu/g) respectively. The least count was obtained from sample oven-dried (OVD) at 80°C (1.3×106cfu/g). The total viable fungal count the fresh tomato (FT) slices had the highest counts (2.6 ×104cfu/g) and the least count was obtained from sample oven-dried at 40°C (6×103cfu/g), highlighting the dynamic microbial changes during different drying processes. Additionally, physiochemical assessments encompassed proximate compotion, pH and ascorbic acid levels. The pH range was between 4.1 (for fresh tomatoes) and 5.2 (for sun-dried tomatoes). Ascorbic acid levels also showed Fresh tomatoes (28.32mg/100g) were the highest but in this case, Oven-dried at 80°C had the least (9.21mg/100g). Notable differences emerged, shedding light on the consequences of drying techniques on key quality indicators. In conclusion, this study provides a comprehensive analysis of the microbial and physiochemical properties of fresh, oven-dry, and sun-dry tomatoes, elucidating the impact of various drying methods on the quality and safety of this widely consumed fruit. More so, the observed variations in physiochemical properties suggest the need for careful consideration of other drying methods such as vacuum drying and freeze-drying to preserve flavor, enhance shelf life, and maintain nutritional quality.
Modified FATA Morgana Algorithm Based on Levy Flight Prapanca, Aditya; Nasreddine Belhaouas; Imed Mahmoud
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 1 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i1.37066

Abstract

Metaheuristics is an algorithmic approach used to solve complex optimization problems that are difficult to solve with conventional methods. The wide application of metaheuristics shows the flexibility and effectiveness of this method in solving various optimization problems in various fields. With the continuous development of technology and the need for more efficient solutions, the use of metaheuristics is expected to increase in the future. A novel group intelligence technique, called the modified mirage algorithm (FATA), is introduced to tackle continuous multi-type optimization problems.  FATA formulates the mirage light filtering principle (MLF) and light propagation strategy (LPS) by replicating the mechanism of mirage formation.  The MLF approach, together with the final integration concept, improves the algorithmic population's exploration capacity within FATA.This study presents the application of the levy flight method to the fata morgana algorithm. Validation in this study between the proposed method and the original fata morgana algorithm. From the simulation results, it is found that the proposed method has better performance on unimodal and multimodal functions.
A Modelling and Simulation of Damping Controller In DFIG AND PMSG Integrated With A Convectional Grid: A Review Sabo, Aliyu; Dahiru, Dauda; Noor Izzri, Abdul Wahab
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 2 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i2.34749

Abstract

One of nature's most plentiful energy sources is a wind energy conversion system, which also has higher sustainability and no pollution. Damping controllers are designed to enhance hybrid robustness and adaptability when using permanent magnet and double-fed induction synchronous generators. The generators are integrated with convectional sources, which requires careful consideration of grid stability (rotor angle stability), which helps prevent mechanical oscillation and grid disruptions due to the instability. Power system stabilizers with excitation are designed and optimized to assure power system stabilizer settings for ideal damping performance and ignore energy losses; damping controllers are essential.
A review on Energy Consumption Model on Hierarchical clustering techniques for IoT- based multilevel heterogeneous WSNs using Energy Aware Node Selection. Iyobhebhe, Matthew; Tekanyi, Abdooulie Momodou. S.; Abubilal, K. A; Usman, Aliyu. D; Isiaku, Yau; Agbon, E. E; obi, Elvis; Chollom, Botson Ishaya; Ezugwu, Chukwudi; Eleshin, Ridwan. O.; Abdulkareem, H. A.; Ashafa, Fatima; Abubakar, Saba; Umar, Abubakar; Ajayi Ore-Ofe; Thomas Muge, Paul
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 2 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i2.34882

Abstract

This review article scrutinizes the energy consumption model related to hierarchical clustering methods in IoT-based multi-tier heterogeneous networks (WSNs). Since energy efficiency is vital to prolong the operational activities of sensor nodes, this review article concentrated on energy-aware node selection as a significant technique for improving energy consumption. The review article deliberates on the challenges posed by dynamic wireless sensor network conditions, node heterogeneity like energy-based, and scalability challenges that affect energy management. This review article scrutinizes the energy consumption model related to hierarchical clustering methods in IoT-based multi-tier heterogeneous networks (WSNs). Since energy efficiency is vital to prolong the operational activities of sensor nodes, this review article concentrated on energy-aware node selection as a significant technique for improving energy consumption. We scrutinize different factors affecting efficient node selection, comprising residual energy, transmission distance, and sensor node reliability while juxtaposing these techniques with traditional node selection schemes. Furthermore, the importance of developed modeling techniques was highlighted. Finally, future research directions were outlined, by accentuating the incorporation of energy harvesting and collective models to improve the stability and operation of Wireless Sensor Networks. This holistic overview aims to offer appreciated insights for authors and practitioners in WSNs.
Mathematical Modelling of Truck Platoon Formation Based on a Dynamic String Stability Ajayi, Ore-Ofe; Umar, Abubakar; Ibrahim, Ibrahim; Olugbenga, Lawal Abdulwahab; Abiola , Ajikanle Abdulbasit
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 2 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i2.34941

Abstract

In this research, the development of a fuzzy logic-based cooperative adaptive cruise control scheme for truck platooning string stability was developed. String stability, which is critical to the operation of truck platooning in the area of enhancing traffic flow and reducing fuel consumption can be affected by unknown uncertainties such as truck incapacitation, delay of platoons and inability to maintain a constant inter-vehicular gap. A commonly reported approach in addressing truck platooning string stability is the Cooperative Adaptive Cruise Control (CACC) scheme. The CACC scheme consists of Adaptive Cruise Control (ACC) and vehicle-to-vehicle (V2V) communication. However, the CACC lacks the requisite flexibility in dealing with unexpected disturbances that can result in the inability to maintain a constant speed and inter-vehicular gap.
Impact of Grid-Scale Solar Photovoltaic Integration on Power System Performance Sunday Ugwuanyi, Nnaemeka; Ugwuoke, Nestor Chima; Obi, Patrick Ifeanyi
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 2 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i2.35474

Abstract

The impact of SPV integration on grid performance is a topic of ongoing debate, with conflicting reports on its effects. This study employs modal analysis, Newton-Raphson power flow, and time-domain simulations to assess the effects of SPV integration on voltage profiles, active power loss, and system stability in the IEEE 4-machine and Nigerian 50-bus power systems. The findings reveal that SPV integration impacts power systems differently, emphasizing the need for a comprehensive approach that considers voltage stability, power losses, and stability constraints. While SPV integration can improve voltage levels and reduce power losses, it may also compromise transient stability, highlighting the importance of careful planning and grid reinforcement. For the IEEE 4-machine system, SPV integration is feasible up to 25% based on power loss, but transient stability constraints limit it to 0%. For the Nigerian grid, optimal SPV integration is achieved at 10% based on power loss and voltage profile, while transient stability constraints limit integration to 5%. This study underscores the necessity of a multi-metric approach to defining SPV penetration limits, considering the trade-offs between voltage performance, power loss, and system stability.
Solar-Powered IoT-Based Home Fire Early Warning and Protection System Muhammad Arief Wicaksono; Amirullah, Amirullah; Plangklang, Boonyang
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 2 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i2.35773

Abstract

This paper presents the implementation of a prototype of a fire early warning system in a residential house using temperature and smoke sensors supplied by an Internet of Things (IoT) based solar module. The 10 Wp solar module is the energy source connected to a 12V battery via a solar charge controller (SSC). Data retrieval is carried out through testing by the MQ-2 Sensor and LM35 Sensor, respectively, to detect smoke (gas) and heat. The system then activates the buzzer, sends data from the detection of the status and level of smoke (gas) and heat to the smartphone screen and liquid crystal displays (LCD) in the form of an alarm, and orders the PLN switch to work to cut off the electricity. The results of the tool test show that the proposed prototype is able to provide early warning notifications regarding the status and level of smoke (gas) and heat - both from the LCD and remotely from the smartphone, and is able to activate the relay dan order the switch cuts off the electricity to prevent fire. The prototype system's source is supplied by solar modules independently, making it applicable in remote areas with limited electricity access-compared to the previous model which was supplied solely by the electricity grid.
Microbiological and Physiochemical Assessment of Corn Meal (Agidi) Omorodion, Nnenna Jennifer; Victoria OlaIokungbaye , Modebola
Vokasi Unesa Bulletin of Engineering, Technology and Applied Science Vol. 2 No. 2 (2025)
Publisher : Universitas Negeri Surabaya or The State University of Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/vubeta.v2i2.35907

Abstract

Corn meal (Agidi) is a gel-like traditional fermented starchy food item produced from maize, although millet and sorghum can also serve as raw materials. It is known by different names in different localities. A total of 30 corn meal (Agidi) comprising of 15 white and 15 jollof agidi samples were bought from Choba market in Port Harcourt Rivers State were examined and analyzed using standard microbial techniques. The Total Bacteria count for white (plain) Agidi ranged from 6.30 logcfu/g - 8.06 logcfu/g. The Staphylococci count for White Agidi samples ranged from 6.0 logcfu/g – 8.2 logcfu/g. The Coliform count ranged from 6.00- 7.96 cfu/g. The results generated from this study exceeded the acceptable limit for bacteria in food. Bacteria isolated from White agidi includes Staphylococcus spp, (31.58%), Enterococcus sp (21.05%). Bacillus sp, (18.42%), Escherichia coli (15.75%) and Klebsiella sp (10.53%). Pseudomonas sp (2.63%). For jollof agidi the bacterial isolated Staphylococcus spp, (30.8%) Bacillus spp, (24.6%). Enterococcus sp (20.0%), Escherichia coli (12.3%), Klebsiella sp 7(10.8%) and Pseudomonas sp (1.5%). pH of corn meal ranged from 4 – 6, the moisture content ranged from 80% – 90%, while the titratable acidity ranged from ranged from 0.20 – 0.40. Proper handling of agidi during production must be taken. This is to prevent contamination from environmental and human sources. Control measures to prevent cross-contamination of agidi require procedures for maintaining the hygienic quality of the processing environment and equipment. High level of hygiene be maintained in the preparatory processes and production of this cornmeal (Aidi) to enhance health safety.

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