Engineering Science and Technology-An International Journal-Jestech最新文献

{"title":"Sizing of interoperable EV charging stations on highways with a coordinated charging scheduling strategy","authors":"Ömer Gönül ,&nbsp;A.Can Duman ,&nbsp;Önder Güler","doi":"10.1016/j.jestch.2025.102035","DOIUrl":"10.1016/j.jestch.2025.102035","url":null,"abstract":"<div><div>Electric vehicle charging station (EVCS) sizing on highways poses unique challenges compared to urban areas due to the “charge-and-go” tendency of drivers, fewer and more distant stations, and higher charging demand. Unlike urban areas, where prolonged parking enables temporal load management, highways require dynamic spatial load distribution. Special strategies, such as coordinated charging and interoperability, enable efficient and cost-effective EVCS sizing for highways. Therefore, this study proposes a coordinated charging strategy for highway EVCS sizing, incorporating interoperability principles. Charging demand is managed through spatial load shifting and communication between interoperable EVCSs, efficiently utilizing available fast-charging sockets. If no sockets are available, EVs are directed to neighboring stations based on their remaining battery energy. Indirectly, this intelligent redistribution of demand minimizes grid overloads, enhancing system reliability. The method which is applied to Türkiye’s busiest highway reduces charging equipment requirements by 15.2%, significantly lowering initial investment costs. Moreover, spatially distributed charging reduces annual peak power demand by 22.2%, mitigating grid stress by balancing the load across the network. These results highlight the potential of incorporating coordinated charging in EVCS sizing to improve sustainability, feasibility, and scalability of EV infrastructure. This approach offers a replicable framework for tackling EVCS challenges on highways worldwide.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"65 ","pages":"Article 102035"},"PeriodicalIF":5.1,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143688019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Determination of ballistic properties of densified reinforced laminated wood material","authors":"İlker Yalçın ,&nbsp;Raşit Esen","doi":"10.1016/j.jestch.2025.102032","DOIUrl":"10.1016/j.jestch.2025.102032","url":null,"abstract":"<div><div>The aims of this study is to determine the ballistic properties of densified, reinforced, and laminated wood material. For this purpose, the samples obtained from Uludağ Fir (Abies nordmanniana subsp. bornmülleriana mattf.) and black poplar (Populus nigra L.) woods were impregnated with melamine formaldehyde resin and then densified at 120 °C and 140 °C with 25 % and 50 % thermo-mechanical method, and the panels were prepared. Then, these panels were laminated using 3, 5, and 7 layers, fiberglass, and carbon fiber reinforcement materials. Ballistics tests were carried out following the NIJ 01010.06 standard. In addition, stereo microscope and SEM images were examined to determine the changes in the anatomical structure of the wood material after the densification treatment and the adhesion of the melamine formaldehyde and polyurethane resins to the wood material. As a result of the ballistic test, laminated materials did not provide protection. Afterward, 2 pieces of 5 and 1 piece of 3-layer laminated panels were produced for ballistics tests. Ballistic protection was obtained from fiberglass and carbon fiber reinforced, laminated materials obtained from Black poplar and Uludağ Fir wood materials, which are 50 % densified at 120 °C and 140 °C. It is recommended that the panels be reinforced with fiberglass and carbon fiber, and 50 % densified panels can be used indoors and outdoors where ballistic resistance is required.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"65 ","pages":"Article 102032"},"PeriodicalIF":5.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Towards enhanced photovoltaic Modeling: New single diode Model variants with nonlinear ideality factor dependence","authors":"Martin Ćalasan ,&nbsp;Snežana Vujošević ,&nbsp;Gojko Krunić","doi":"10.1016/j.jestch.2025.102037","DOIUrl":"10.1016/j.jestch.2025.102037","url":null,"abstract":"<div><div>The energy sector is increasingly challenged to transition to sustainable and renewable energy sources. Solar cells play a pivotal role in this process, enabling the direct conversion of solar energy into electricity. Traditional solar cell models, such as the single-diode model (SDM), often assume a constant diode ideality factor, despite research indicating its dependence on voltage. This study introduces five novel SDM variants that incorporate the nonlinear dependence of the diode ideality factor on voltage, aiming to improve the accuracy of current–voltage (I-V) characteristic modeling. For each of the proposed models, an analytical current–voltage relationship was derived using the Lambert W function, ensuring precise representation of the system’s behavior. Experimental validation was conducted on a standard solar cell (RTC France) and three commercial modules (MSX60, PWP201, KC200GT), demonstrating significant reductions in modeling errors (RMSE) compared to classical SDM, DDM, and TDM approaches. Furthermore, the analysis highlights the stable performance of the proposed models under varying conditions of insolation and temperature, confirming their robustness and practical applicability. This work provides an innovative framework for enhancing solar cell modeling, laying the foundation for future research and practical applications in optimizing photovoltaic systems.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"65 ","pages":"Article 102037"},"PeriodicalIF":5.1,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Front Matter 1 - Full Title Page (regular issues)/Special Issue Title page (special issues)","authors":"","doi":"10.1016/S2215-0986(25)00100-4","DOIUrl":"10.1016/S2215-0986(25)00100-4","url":null,"abstract":"","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"64 ","pages":"Article 102045"},"PeriodicalIF":5.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Huffman coding-based data reduction and quadristego logic for secure image steganography","authors":"Irsyad Fikriansyah Ramadhan ,&nbsp;Ntivuguruzwa Jean De La Croix ,&nbsp;Tohari Ahmad ,&nbsp;Andre Uzamurengera","doi":"10.1016/j.jestch.2025.102033","DOIUrl":"10.1016/j.jestch.2025.102033","url":null,"abstract":"<div><div>Ensuring secure data transmission is critical for maintaining confidentiality and has become increasingly important. Steganography, which embeds secret information within digital images, has been widely explored to safeguard sensitive data from unauthorized access over public networks. However, existing steganographic algorithms often face a significant trade-off between payload capacity, image quality, and security. Embedding large amounts of data can cause noticeable distortion in image quality, undermining the technique’s effectiveness. Furthermore, current methods lack adaptability to diverse cover media and struggle to maintain reversibility and high visual quality under increased embedding capacities. To address these challenges, this study proposes a novel steganographic algorithm integrating two key innovations: (1) Enhancement of stego image quality via stego image’s segmentation into four images, reducing concentration-induced distortions, and (2) optimization of data embedding through Huffman coding through a lossless compression minimizing the embedding-induced distortions while maximizing payload capacity. The experimental results show that the proposed method achieves high visual fidelity, with PSNR values ranging from 75.793 dB to 44.997 dB without encryption and from 51.159 dB to 44.316 dB with encryption for payloads between 10 KB and 100 KB. These values exceed the 30 dB threshold for acceptable image steganography, ensuring minimal perceptual distortion. Additionally, the SSIM remains consistently above 0.98, indicating strong structural preservation of stego images. Comparative analysis with existing methods confirms that the proposed approach outperforms in embedding capacity, structural similarity index measure (SSIM), and peak signal-to-noise ratio (PSNR), reflecting the stego images’ quality.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"65 ","pages":"Article 102033"},"PeriodicalIF":5.1,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A binary grasshopper optimization algorithm for solving uncapacitated facility location problem","authors":"Ahmet Babalik,&nbsp;Aybuke Babadag","doi":"10.1016/j.jestch.2025.102031","DOIUrl":"10.1016/j.jestch.2025.102031","url":null,"abstract":"<div><div>The Uncapacitated Facility Location Problem (UFLP) is a real-world binary optimization problem that aims to find the number of facilities to open, minimizing the total cost of exchange between customers and facilities, as well as the opening costs of these facilities. UFLP is classified as an NP-Hard problem. Metaheuristic methods are often preferred to solve UFLP due to their ability to find acceptable solutions in a reasonable time and its NP-Hard characteristics. Grasshopper Optimization Algorithm (GOA) is a continuous metaheursitics optimization algorithm. In the literature, although some binary versions of the GOA algorithm have been used to solve problems such as feature selection, knapsack, scheduling and cluster covering, its performance analysis has not been conducted on UFLP which is pure binary optimization problem. In this study, a novel binary version of the GOA integrated with a novel binarization procedure is proposed for solving the UFLP. In the binarization procedure, a probability-based update strategy has been developed for generating new candidate solutions. This approach ensures the probability of determining the effect of the global best solution on the candidate solution. Besides, during the population update phase, there are two different mechanisms to update the global best solution and other grasshoppers. To enhance diversity in the grasshopper population, an α parameter has been integrated into the original algorithm. It was aimed to improve the quality of the candidate solutions by the integration of the α parameter. The performance of the proposed algorithm is assessed on the CAP and M* datasets. The obtained GAP values for the CAP 71-CAP A, CAP B, and CAP C problems are 0, 0.14, and 0.18, respectively. The GAP is 0 for the MO1-MO5, MP2, MP3, and MQ1-MQ3 problems, and GAP ≤ 0.24 for the remaining problems. The results were compared with other state-of-the-art binary optimization algorithms. The experimental results show that the proposed method is superior to the other compared algorithms and is an effective algorithm for solving UFLPs.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"65 ","pages":"Article 102031"},"PeriodicalIF":5.1,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of bi-directional switched-capacitor DC-DC converter for EV powertrain application","authors":"K. Mounika Nagabushanam ,&nbsp;Tarkeshwar Mahto ,&nbsp;Somesh Vinayak Tewari ,&nbsp;Ramanjaneya Reddy Udumula ,&nbsp;Majed A. Alotaibi ,&nbsp;Hasmat Malik ,&nbsp;Taha Selim Ustun","doi":"10.1016/j.jestch.2025.102016","DOIUrl":"10.1016/j.jestch.2025.102016","url":null,"abstract":"<div><div>The research presents a novel Bidirectional Switched Capacitor DC-DC (BSCD) Converter and demonstrates its application in integrating a battery with an electric vehicle’s (EV) traction motor. During discharging, the motor is powered by the battery through the converter, and during charging, the traction motor functions as a generator, returning the recovered energy to the battery via the converter. The recommended converter employs a two-duty cycle operation to enhance voltage gain while minimizing circuit components. It utilizes a switched capacitor (SC) cell, enhancing the voltage transfer ratio by operating capacitors CS1 and CS2 in parallel or series. The work includes analysis of the converter’s steady state, mathematical approach, state-space modelling, stability, and efficiency. The proposed converter achieves an efficiency of 90.66 % in charging mode and 96.6 % in discharging mode, with a Gain Margin of 54.4 dB and Phase Margin of 8.09°, indicating stability. Comparative evaluations with existing BDCs are also provided. The implementation of a closed-loop simulation using MATLAB/Simulink and dSpace software validates the performance of the suggested converter-based drive. Furthermore, an experimental investigation of a 200 W, 30 V/430 V configuration confirms the converter’s practical viability.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"65 ","pages":"Article 102016"},"PeriodicalIF":5.1,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic modelling for the family of 5-axis CNC milling machines with application to feed-rate optimization","authors":"Anh-My Chu ,&nbsp;Van-Cong Nguyen ,&nbsp;Chi-Hieu Le ,&nbsp;James Gao ,&nbsp;Michael Packianather ,&nbsp;Shwe Soe","doi":"10.1016/j.jestch.2025.102015","DOIUrl":"10.1016/j.jestch.2025.102015","url":null,"abstract":"<div><div>The 5-axis CNC milling machines are complex mechanical systems, and they can be designed with hundreds of 5 degrees of freedom mechanisms. The kinematic and dynamic modelling of machines is crucial for optimising the machine design and the milling process. However, formulating the dynamics model of 5-axis milling machines has never been proposed so far. Moreover, efforts have been made to develop kinematic models for the machines; however, formulating the generalized kinematic model for all possible 5-axis milling machines in closed form is challenging. In this paper, a novel method of kinematic and dynamic modelling for the entire family of 5-axis milling machines is developed. First, the special features of the machines family are fully studied to formulate effectively the generalized forward and inverse kinematic equations in closed-form. Second, by treating each 5-axis mechanism as a closed mechanism subject to a nonlinear kinematic constraint characterizing the machining process, the dynamics model for the whole family of 5-axis milling machines is successfully formulated, and the inverse dynamic equation is derived in closed-form. Finally, to demonstrate the importance and impact of the proposed method, useful applications were conducted; and these were supported by both numerical simulations and actual cutting experiments. Compared with previous works, our study includes new generalized equations of kinematics and dynamics for the family of 5-axis milling machines, and useful applications of the proposed equations for optimization of the 5-axis machining.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"65 ","pages":"Article 102015"},"PeriodicalIF":5.1,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using regression trees for improving the efficiency of nonlinear programming solvers","authors":"Fulya Terzi,&nbsp;Necati Aras,&nbsp;M. Gökçe Baydoğan","doi":"10.1016/j.jestch.2025.102012","DOIUrl":"10.1016/j.jestch.2025.102012","url":null,"abstract":"<div><div>Optimization plays a critical role in fields such as economics, engineering, and computational sciences, where finding the optimal values of decision variables is essential for the design of a product, production system, or service system. However, many optimization problems remain challenging even with advanced solvers. This study integrates machine learning into optimization by employing a regression tree algorithm that is trained on sampled solutions of the problem to improve the efficiency of derivative-free nonlinear programming solvers. The approach is tested on 24 single-objective functions to reduce the domain of decision variables. The results demonstrate better accuracy and consistency in the solver performance. Incorporating a machine learning technique into an optimization method can be extended to solve black-box optimization problems and paves the way for innovative solutions in engineering design and other domains.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"64 ","pages":"Article 102012"},"PeriodicalIF":5.1,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depth-Induced Intra-to-Inter Transformer network for stereoscopic image retargeting","authors":"Xiaoting Fan ,&nbsp;Long Sun ,&nbsp;Zhong Zhang","doi":"10.1016/j.jestch.2025.102029","DOIUrl":"10.1016/j.jestch.2025.102029","url":null,"abstract":"<div><div>With the advancement of three-dimension visual applications, stereoscopic image editing technologies have attracted widespread popularity in both industry and entertainment. In this paper, we focus on the fundamental stereoscopic image content editing problem, <em>i.e.</em> stereoscopic image retargeting, which aims to transform stereoscopic images to specific resolution with prescribed aspect ratios adaptively. Due to the additional binocular information present between the left and right views in stereoscopic images, the CNN-based stereoscopic image retargeting methods have some obvious limitations in capturing long-range dependencies. To address these issues, we present a depth-induced intra-to-inter Transformer network (DITrans-Net) for stereoscopic image retargeting, which learns the long-range dependencies information between intra-view and inter-view by an intra-to-inter feature extraction module and aggregates the depth information of left view and right view by a depth-induced feature integration module. Specifically, an intra-to-inter feature extraction module exploits intra-to-inter Transformer blocks for long-range dependencies information extraction firstly. Furthermore, a depth-induced feature integration module employs disparity attention learning mechanism to learn stereo correspondence and enhance disparity varying consistency. Finally, a hybrid loss function is applied to improve the stereoscopic image retargeting quality. Extensive experiments demonstrate that the proposed DITrans-Net achieves significant improvements and outperforms state-of-the-art methods both quantitatively and qualitatively on the various benchmark datasets.</div></div>","PeriodicalId":48609,"journal":{"name":"Engineering Science and Technology-An International Journal-Jestech","volume":"64 ","pages":"Article 102029"},"PeriodicalIF":5.1,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}