https://online.jmst.info/index.php/jmst/issue/feedJournal of Military Science and Technology2024-02-26T03:40:29+00:00JMST editorial staffcontact@jmst.infoOpen Journal Systems<p><strong><em>Journal of Military Science and Technology (JMST)</em></strong> was established by the Academy of Military Science and Technology in 2002 and is a peer-reviewed journal published by the Academy of Military Science and Technology. JMST invites contributions containing new results in various fields of science and technology. The journal considers theoretical and experimental research in areas ranging from fundamental properties to technological applications.</p> <p>Topics covered fields: Electronics & Automations; Materials Science; Chemistry & Environment; Physics; Information technology & Applied Maths; Mechanics & Mechanical engineering-Dynamics.</p> <p>JMST publishes in February, April, June, August, October, and December (language in English, Vietnamese); and in May, and November (language in English)<span style="font-size: 0.875rem;">. </span></p> <p>- Special issue: <em>Section on Computer Science and Control Engineering </em>is published in December (language in English).</p> <p><em><strong>The maximum scores for scientific articles published on JMST by <a href="http://hdgsnn.gov.vn/tin-tuc/quyet-dinh-so-22-qd-hdgsnn-phe-duyet-danh-muc-tap-chi-khoa-hoc-duoc-tinh-diem-nam-2023_729">The State Council for Professorship</a> (updated 7/2023)</strong></em></p> <table width="100%"> <tbody> <tr> <td rowspan="2" width="7%"> <p>No</p> </td> <td rowspan="2" width="45%"> <p>Specialized or multidisciplinary Councils for Professorship</p> </td> <td colspan="2" width="47%"> <p>The maximum scores for scientific articles</p> </td> </tr> <tr> <td width="22%"> <p>Before 2023</p> </td> <td width="24%"> <p>Since 2023</p> </td> </tr> <tr> <td width="7%"> <p>1</p> </td> <td width="45%"> <p>Electrical Engineering – Electronics - Automation</p> </td> <td width="22%"> <p>0.75</p> </td> <td width="24%"> <p><strong>0.75</strong></p> </td> </tr> <tr> <td width="7%"> <p>2</p> </td> <td width="45%"> <p>Chemistry – Food Technology</p> </td> <td width="22%"> <p>0.75</p> </td> <td width="24%"> <p><strong>0.75</strong></p> </td> </tr> <tr> <td width="7%"> <p>3</p> </td> <td width="45%"> <p>Physics</p> </td> <td width="22%"> <p>0.75</p> </td> <td width="24%"> <p><strong>0.75</strong></p> </td> </tr> <tr> <td width="7%"> <p>4</p> </td> <td width="45%"> <p>Mechanical Engineering - Dynamics</p> </td> <td width="22%"> <p>0.5</p> </td> <td width="24%"> <p><strong>0.75</strong></p> </td> </tr> <tr> <td width="7%"> <p>5</p> </td> <td width="45%"> <p>Mechanics</p> </td> <td width="22%"> <p>0.5</p> </td> <td width="24%"> <p><strong>0.75</strong></p> </td> </tr> <tr> <td width="7%"> <p>6</p> </td> <td width="45%"> <p>Information technology & Mathematics</p> </td> <td width="22%"> <p>0.5</p> </td> <td width="24%"> <p>0.5</p> </td> </tr> </tbody> </table> <p> </p> <p> </p>https://online.jmst.info/index.php/jmst/article/view/1046A method to increase video streaming speed and efficiency of storage video using multithreading and Random Access Memory2024-02-26T03:35:59+00:00Hoa Doan Vandoanvanhoa@gmail.comThai Trung Kienxuanbac93bn@gmail.comHoang Dinh Thangxuanbac93bn@gmail.comDao Khac Huanxuanbac93bn@gmail.comNguyen Xuan Bacxuanbac93bn@gmail.comHoa Tat Thangxuanbac93bn@gmail.com<p>There are numerous vital applications for online video storage and network transmission today. With exceptional scalability and browser and device compatibility, Hypertext Transfer Protocol (HTTP) live streaming (HLS) is today's most popular video and audio transmission protocol. In the article, the authors proposed a method of using multithreading and Random Access Memory (RAM) to store and transmit videos to help the server achieve higher speed, improve video transmission speed and video storage efficiency. The results of this research will help multimedia server developers evaluate the appropriate balance of resource usage while still ensuring the quality of online video transmission with a large number of videos and viewers.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1045An evaluation research of constant false alarm rate algorithm for the application of underwater vehicles management system based on USBL sonar principles in shallow water2024-02-26T03:36:16+00:00Trung Thành Đoàndoantrungthanhvdt@gmail.comTran Quang Giangdoantrungthanhvdt@gmail.comVu Hai Langdoantrungthanhvdt@gmail.comBach Nhat Hoang Bạchhoangbn.vdt@gmail.com<p>The paper presents an overview of underwater traffic management systems utilizing sonar principles. Based on the evaluation of the current situation both domestically and internationally, the research team has proposed the development of a underwater signal processing algorithm based on an adaptive threshold in the Ultra-short Baseline System (USBL). The theoretical results were implemented on FPGA hardware, not only enhancing signal detection capabilities but also meeting real-time signal processing requirements when deployed in complex underwater conditions in various shallow water regions of Vietnam. The research's future direction indicates substantial potential in the practical application of hydroacoustic signal processing algorithms when executing hardware implementations.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/849Improving radar target recognition based on generative adversarial network2024-02-26T03:40:29+00:00Tra Nguyensinhvienaolinh2000@gmail.comVu Chi Thanhsinhvienaolinh2000@gmail.comDoan Van Sangsinhvienaolinh2000@gmail.com<p class="jmsttmttubi2021">In this article, we propose a generative model based on the adversarial network structure to enhance images for the RAD-DAR multi-target dataset. The results of comparisons and evaluations indicate that the images generated by the proposed method exhibit a high degree of similarity to the original images. The experimental process also demonstrates that a deep neural network model trained on the augmented dataset achieves higher accuracy in multi-target recognition compared to a model trained on the original dataset. The proposed data generation model serves as an effective solution to address the data scarcity issue in multi-target datasets.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1093Dynamic surface control for electro-hydraulic servo cylinder system2024-02-26T03:35:03+00:00Thước Nghiêm Xuânxuanthuoctudonghoa@gmail.comTrần Đức Thuậnxuanthuoctudonghoa@gmail.comNguyễn Việt Anhxuanthuoctudonghoa@gmail.comNguyễn Xuân Quỳnhxuanthuoctudonghoa@gmail.com<p>Electro-hydraulic systems are widely used in industrial production due to their high power-to-weight ratio, but their heavy-duty nature causes electro-hydraulic systems to endure large disturbance forces even when the actuator slight movement, especially in mobile machines and a system of multiple actuators. Dynamic surface control based on the backstepping method is applied to avoid the derivative explosion phenomenon when calculating the derivative of the virtual control input, which greatly reduces the computational complexity of the system. To verify the effectiveness of the proposed controller, the proportional integral controller is designed to compare with the dynamic surface control using the Backstepping technique and the comparison results show that The proposed controller has more accurate trajectory tracking performance.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1072Proposing an optimal control system specifically focused on the black tea fermentation process2024-02-26T03:35:22+00:00Assoc.Prof.Dr Du Dao Huydaohuydu@tnut.edu.vnPhạm Thanh Bìnhbinh.nomafsi@gmail.comLại Khắc Lãibinh.nomafsi@gmail.comTăng Cẩm Nhungbinh.nomafsi@gmail.comHồ Mậu Việtbinh.nomafsi@gmail.com<p class="jmsttmttcuibi"><span lang="IT">Currently, black tea maintains a significant position in the global beverage market and brings numerous health and cultural benefits. Therefore, quality control of black tea is a matter of concern. In this article, we proposes an optimal control system focused on the black tea fermentation process, based on adjusting temperature and humidity parameters at each stage affecting the quality of black tea. The color change process of tea over time when influenced by temperature and humidity is identified through image analysis at the moment of sudden color change. Regulating humidity and temperature from the humidification system needs to be controlled by electromagnetic valves. The author models the interaction relationship between electromagnetic valves based on graph theory, and an optimal algorithm for steam flow through electromagnetic valves. The proposed results include a theorem and an algorithm, which have been mathematically proven and simulated to ensure control requirements for the quality assurance of black tea.</span></p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/993PD algorithm combined with Sugeno fuzzy logic improves trajectory tracking control quality for Delta parallel robot2024-02-26T03:38:45+00:00Đinh Xuân Minhphamvanhung@haui.edu.vnHung Phamphamvanhung@haui.edu.vnNguyễn Nam Khánhphamvanhung@haui.edu.vnMai Thế Thắngphamvanhung@haui.edu.vnHà Minh Quânphamvanhung@haui.edu.vnHà Việt Anhphamvanhung@haui.edu.vn<p> The research aims to improve the model-based PD algorithm by using Sugeno fuzzy logic to adjust the parameter values of the controller online, improving the trajectory tracking quality and robustness to noise for the Delta parallel robot. The study uses Matlab and Simulink simulation tools to validate the reliability of the controller on an eight-shaped trajectory. The simulation results show that the control performance is very good when it is possible to control the motion of the Delta 3-DOF parallel robot follow the desired trajectory and maintain stability with a fast settling time , even when the system is affected by unknown external disturbances.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1018A study on compensation part calculation of fire parameters for firepower on a moving platform2024-02-26T03:36:48+00:00Quang Hưng Đỗquanghung280880@gmail.comPhương Anh Phạm Thịpttanh2003@yahoo.comVũ Nguyễnvutudonghoa@yahoo.com.vn<p>The article proposes a fire parameters calculation algorithm for mounted on moving platform anti-aircraft guns based on two parts: main part is the fire parameters calculated for ground mounted anti-aircraft gun and compensated part caused by movement of the platform. The proposed algorithm is verified by simulation in many scenarios and concretized by a structural diagram of the system.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1005Design and simulation of a coplanar capacitive sensor for non-destructive thin-film dielectric measurement2024-02-26T03:37:38+00:00Dũng Nguyễn Anhdungna@haui.edu.vnNam Nguyễn Đắcnguyendacnam2k4@gmail.comHoàng Nguyễn Việtkaratedohoang1@gmail.comMinh Nguyễn Caominhyenlam2k3@gmail.comHoàng Đồng Minhdongminhhoangpytn@gmail.comHải Nguyễn Đắchaind@haui.edu.vn<p> This article presents a different design of coplanar capacitive sensors for application in non-destructive thin film dielectric measurement with high performance and minimal cost. Another difference in this sensor design is that to reduce parasitic components and common noise, the capacitive sensor structure is designed to include a reference capacitor and a sensing capacitor. Using this structure, the dielectric of the thin film can be estimated through the unbalanced capacitance generated between the two signals from the reference capacitor and the sensing capacitor. Two electrode structures were researched, simulated, and the interdigital structure with the highest performance was selected. Simulations were conducted using a Polyethylene (PE) thin film with dielectric varying from 1.375 to 3.19 and a thickness of 40 µm to study the working principle of the sensor. Simulation results show the linearity of the sensor's output capacitance corresponding to different dielectrics. The sensitivity of the sensor is 20.86 fF/1 dielectric unit and 178.96 fF/1 dielectric unit for thin films with thicknesses of 10 µm and 120 µm, respectively. Simulation results demonstrate that this sensor has high potential for application in dielectric measurement of thin films for military and biomedical applications.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/986Research and analyze material composition electrodes of Li-ion battery with high discharge current2024-02-26T03:39:38+00:00Minh Cường Đoàndoanminhcuong90@gmail.comMinh Thanh Vudoanminhcuong90@gmail.comVan Tai Buidoanminhcuong90@gmail.comThi Phuong Phamdoanminhcuong90@gmail.comVan Tu Nguyendoanminhcuong90@gmail.comTuan Anh Doandoanminhcuong90@gmail.comThe Nam Daodoanminhcuong90@gmail.comVan Long Dinhdoanminhcuong90@gmail.comVan Phuoc Maidoanminhcuong90@gmail.comThi Dinh Phandoanminhcuong90@gmail.comNguyễn Thị Thu Ninhdoanminhcuong90@gmail.comLê Trần Tiệpdoanminhcuong90@gmail.com<p> The monolithic cylindrical Li-ion battery, measuring 360 × 50mm (length × diameter), possesses the following electrochemical specifications: voltage of 3.7 V and a capacity of 40 Ah. It was disassembled for the purpose of researching electrode materials. Advanced materials analysis techniques, such as scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and inductively coupled plasma mass spectrometry (ICP MS), were employed to ascertain the composition, morphology, and structure of the electrode materials. The analytical findings indicate that the positive electrode comprises an active material primarily composed of Lithium Cobalt Oxide, along with additives coated on an aluminum (Al) foil with a thickness of 25 micrometers. The primary constituent of the negative active material is graphite, coated on copper (Cu) foil with a thickness of 20 micrometers.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1068Microwave-assisted synthesis of oleic acid-capped silver nanoparticles as lubricant additives2024-02-26T03:35:39+00:00Ha Quoc Banghaquocbang@gmail.com<p>Recently, metal nanoparticles have been studied extensively as lubricant additives. Owning to their nanometer size, the nanoparticles can fill micro defects on contacting surfaces, acting as repairing agents. In this work, we describe a simple and fast method to fabricate monodisperse silver nanoparticles using oleic acid as a capping agent. In particular, silver nitrate was reduced by oleylamine in the oleic acid medium using acetonitrile as a co-solvent, and the reaction was heated by a microwave source. Results showed that the particle size was greatly affected by varying the reductant concentration. The average diameter of synthesized nanoparticles ranges from 3.0 nm to 4.0 nm at optimum conditions. The dispersibility in the oil of the product is attributed to the long-chain alkyl from fatty acid grafted on the surface layer, which constitutes about 21% of the weight of the nanoparticles as determined by thermogravimetric analysis.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/997Research on acid rain developments in Khanh Hoa province in the period 2013-20222024-02-26T03:37:55+00:00Nguyen Trong Cuongnguyencuongdbnd@gmail.comHong Thach Phamphamhongthach.ndmt@gmail.comThanh Hai Phamthanhhaipham.vn@gmail.comNgoc Nam Lamngocnam240395@gmail.comTuan Viet Tranviet.vittep@gmail.comThi Thuy Nguyen Lelethithuynguyen89@gmail.com<p> The paper presented the results and analysis of acid rain parameters within 10 years from 2013 to 2022 in Khanh Hoa province. The results showed that, over 10 years, the number of the rains in Khanh Hoa tended to increase gradually from 2014-2022, the rate of acid rain was quite high in the periods from 2013 to 2015 and from 2018 to 2019. However, in recent years this rate has been very low. Surveying the number of the rains by month showed that the number of the rains and the frequency of acid rain fall in the last months of the year. The analysis of the concentration of ions in rainwater showed that SO<sub>4</sub><sup>2-</sup> ion was the main component causing acid rain, Ca<sup>2+</sup> ion was the main acid neutralizing component, and the risk of acid rain is still high.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1013Researching the modification and evaluating the effectiveness of treating the military poison yperit with Busofit activated carbon fabric2024-02-26T03:37:05+00:00Hoàng Thanh Hảikostroma12@gmail.comHoàng Trọng Hiếukostroma12@gmail.comLại Văn Cươngkostroma12@gmail.comTrần Quang Sángkostroma12@gmail.comLã Xuân Thảo Lã Xuân Thảoxuan76thao@gmail.com<p>Activated carbon fabric (ACF) Busofit is a commercial product widely used in Russia and Eastern European countries for adsorption and environmental treatment. In this paper the results of a study on the modification of ACF using thermal methods and evaluates its effectiveness in treating the toxic agent yperite are presented. The results show that after be modificated at 700 °C for 2 hours, Busofit ACF achieves a specific surface area of 970 m<sup>2</sup>/g and a yperite treatment efficiency of approximately 96.4% at a surface toxic density ranging from 2 g/m<sup>2</sup> to 14 g/m<sup>2</sup>, a temperature of 30 °C, and a treatment time of 5 minutes. The research findings serve as a basis for further development of new materials for future applications in the production of chemical protective gear.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1119Pluronic F-127 modified ZnO nanoparticles: Green synthesis, surface modification, characterization and anticancer properties 2024-02-26T03:34:24+00:00Nguyen Ngoc Sonnguyenhuong0916@gmail.comVu Minh Thanhnguyenhuong0916@gmail.comNguyen Thi Huongnguyenhuong0916@gmail.com<p class="jmsttmttubi2021" style="line-height: 97%;"><span style="font-family: 'Times New Roman Italic',serif; letter-spacing: -.05pt;">In this study, we report a green synthesis method for ZnO NPs using <a name="OLE_LINK1"></a>guava leaf extract and surface modification of these nanoparticles with Pluronic. The structural, chemical characteristics, and morphological features of the synthesized ZnO NPs and their surface-modified counterparts were thoroughly described using appropriate techniques such as X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The anticancer activity of the Pluronic-coated ZnO NPs was also evaluated on cervical cancer cells (Hela). The results revealed that the synthesized nanomaterial exhibited excellent effectiveness in eradicating Hela cancer cells. The cell viability of Hela cells decreased significantly to 8.85% when the nanoparticle concentration used was 200 µg/mL. The half-maximal inhibitory concentration (IC50) was relatively low, around 28.07 µg/mL. These findings demonstrate the significant potential of using Pluronic F-127 surface-modified ZnO NPs in cancer treatment. </span></p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/994Enhancing photocatalytic degradation of methylene blue by TiO2-CeO2 heterostructure under visible light irradiation2024-02-26T03:38:28+00:00Thi Nga Vuvth.khanhhuyen.nga18@gmail.comThe Tam Letamlt@vinhuni.edu.vnHoa Du Nguyenhoadu.nguyen@gmail.comHoang Hao Nguyễnhaonguyen0404@gmail.comThi Thu Hiep Lethuhiep.2011@gmail.comThi Thanh Lam Chuthanhlamchu49@gmail.comThi Kim Chung Daukimchungnln81@gmail.comLe Khanh Huyen Nguyennguyenlekhanhhuyen686@gmail.comThi Van Suong Hohovansuong2k3@gmail.comThi Quynh Nguyennguyenquynhhoa2704@gmail.comDr Quang Ho Dinhhodinhquangdhv@gmail.com<p class="jmsttmttubi2021">TiO<sub>2</sub>-CeO<sub>2</sub> heterostructure was synthesized by a simple hydrothermal technique, with an average particle size of 21 nm, and high uniformity from the common precursors. For the characterization of the catalyst properties, the techniques of X-ray Diffraction (XRD), Fourier-Transform Infrared Spectroscopy (FTIR), and Transmission Electron Microscopes (TEM) were used. The TiO<sub>2</sub>-CeO<sub>2 </sub>heterostructure exhibited higher photocatalytic activity than TiO<sub>2</sub> in the removal of methylene blue (MB) dye under visible light irradiation. The combination of TiO<sub>2</sub>-CeO<sub>2</sub> facilitated electron pathways, creating favorable conditions for efficient separation of electron-hole pairs and enhancing the photocatalytic activity of the material. The TiO<sub>2</sub>-CeO<sub>2</sub> heterostructure demonstrated rapid and highly efficient photodegradation of methylene blue, achieving an 89.79% removal rate after 120 minutes of irradiation. This performance, coupled with enhanced visible light utilization, suggests wide applications in the field of photocatalysis.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/989Controllable light group velocity in a degenerate two-level medium under the assistance of an external magnetic field2024-02-26T03:39:03+00:00Dong Hoang Minhdong.gtvtmt@gmail.comThai Doan Thanhdonghm@hufi.edu.vnNguyen Thi Thu Hiendonghm@hufi.edu.vnTrang Huynh Dang Khoadonghm@hufi.edu.vnLe Van Doaidonghm@huit.edu.vnNguyen Manh Thangthangnm@jmst.info<p class="jmsttmttubi2021" style="line-height: 97%;"><a name="_Hlk149653971"></a>In this work, we proposed a simple model for control of subluminal and superluminal light propagation via an external magnetic field in a lambda configuration degenerate two-level atomic medium. We show that the absorption-dispersion properties and group index under the influence of the strength of coupling laser and external magnetic fields are controlled. By changing the direction and magnitude of the magnetic field, the medium switches from transparency with normal dispersion to enhanced absorption with anomalous dispersion at the line center, corresponding with the transfer from slow light to fast light. This work may provide for the application realization of magneto-optic switches and storage devices in quantum information processing.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1030A night vision color image fusion method based on statistical color transform technology in YUV color space2024-02-26T03:36:32+00:00Vũ Nam Lêlvnam.mta@gmail.comThành Dương Nguyễnduongnth07@gmail.comCông Nguyên Hànguyenkh.vlkt@gmail.com<p>Image fusion technology combines images from different sensors into one image to fully utilize sensors, thereby improving observation efficiency and streamlining the equipment. Unlike grayscale image fusion, color image fusion assigns images from the sensors into different color channels, emphasizing the image of each sensor and enhancing the ability to detect, recognize and remember the scene. In this paper, a method of night vision color image fusion based on statistical color transform technology in YUV color space is proposed. This method transfers the color statistical parameters of a real image to the fused image and selects the optimal fusion parameters to make it more realistic and enhance infrared target visibility. The evaluation, based on color statistical parameters and human eye observation, demonstrates the effectiveness of the proposed color image fusion method.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1095Adaptive control technique to enhance differential multi-objective evolutionary algorithm based on variation rate of quality measures2024-02-26T03:34:46+00:00Minh Tranminhchip79@gmail.comNguyễn Longminhchip79@gmail.comNguyễn Đức Địnhminhchip79@gmail.comThái Trung Kiênminhchip79@gmail.com<p>When evaluating the multi-objective evolutionary algorithm, they not only focus on the quality of the solution set but also pay attention to the algorithm's ability to explore and exploit because that is the factor ensuring the convergence and diversity of the solution set. Maintaining a balance between exploration and exploitation of the algorithm is a difficult but interesting problem in the research field. In this article, we analyzed the relationship between the quality of the solution set and the algorithm's search efficiency to evaluate trends and propose an adaptive control technique based on the variation rate of quality measures to maintain a better balance between the exploration and exploitation capabilities. Experimental results on the multi-objective evolutionary algorithm using differential direction with some typical benchmark sets are highly competitive, demonstrating the ability to improve the algorithm's efficiency.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/987Tabular text embedding for Vietnamese text-based person search2024-02-26T03:39:21+00:00Phan Thi Hoaithanh-thuy.pham@mica.edu.vnNguyen Minh Phucthanh-thuy.pham@mica.edu.vnNguyen Huu Hieuthanh-thuy.pham@mica.edu.vnDr. Thuy Pham Thanhthanh-thuy.pham@mica.edu.vnLe Thi Lanthanh-thuy.pham@mica.edu.vn<p class="jmsttmttubi2021" style="line-height: 99%;">Vietnamese text-based person search is still a challenging problem with the limited dataset of Vietnamese descriptions. The current popular approach to this problem is Deep Neural Networks (DNNs), and recently, transformer networks have been more favored because of their outperformance over CNN and RNN networks for both vision and natural language processing tasks. However, DNN, or transformer networks, require a large amount of training data and computing time for efficient learning of visual and textual features. This brings a burden for implementing Vietnamese text-based person search by DNN, or transformer networks. Towards building a Vietnamese text-based person search system on a scarce resource dataset of Vietnamese descriptive sentences with low computing cost, in this work, we propose to apply the transformer-based architecture named TabTransformer for contextual embedding of the noun phrases chunked from the Vietnamese descriptive sentences. This is the first time the TabTransformer network has been deployed together with CNN and RNN architectures for Vietnamese text-based person search. The experimental results on a limited dataset of 3000VnPersonSearch show the better recognition accuracy of the proposed method compared to the baseline method by about 7.5% at Rank 1. In addition, the computing time of our method is more effective than the baseline method.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/996Research and design a model of 2D profile generation system applied in laser welding technology using piezo linear actuators2024-02-26T03:38:12+00:00Trọng Khuyên Nguyễnnguyentk126@gmail.comQuang Phước Trầntqphuoc@hcmut.edu.vn<p class="jmsttmttubi2021"><span style="letter-spacing: -.1pt;">The article introduces a method to create any 2D laser profiles applied in welding technology. This method allows for the creation of profiles that best suit the weld characteristics and material of the weld workpiece, thereby improving the quality, accuracy, and aesthetics of the weld and increasing laser welding efficiency. In the study, the authors proposed a model of a 2D laser profile generation system with a reflecting mirror and two piezoelectric linear actuators. The forward and inverse kinematic equations were completely solved, while a control algorithm was proposed to control the motion of linear actuators. The model is simulated on MATLAB with circular, sin-wave, and 8-figured profiles. The obtained results show that the control profiles are almost close to the desired ones (both shape and scan period). There is a displacement between them. With the given simulation parameters, the displacements of the above-mentioned profiles are 0.03 mm (1.5%), 0.05 mm (2.5%), and 0.05 mm (1.25%), respectively. This shifting can be reduced by increasing the number of samplings. The simulation results provide strong evidence for the feasibility of implementing a practical 2D laser profile generation system based on the proposed model. </span></p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/1011Investigating the oscillation of the launching vehicle on the elastic background2024-02-26T03:37:22+00:00Xuân Diệu Trầnxuandieuvtl@gmail.comNguyễn Xuân Thànhxuandieuvtl@gmail.com<p>In this paper, the dynamics model of a launching vehicle on an elastic background is established using the Lagrange II approach. Using this model for a given launcher vehicle configuration, the vibrational laws of the vehicle and launcher motions are determined. Thereby, the feasibility of the structural model of the vehicle and launch pad was initially evaluated. The developed dynamic model can be used for structural design and shot optimization for a class of rocket-launching vehicles with the same structural principles.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/974Study on the casting of a 4-way plug valve body in a submarine from Cu-Zn-Si copper alloy2024-02-26T03:40:12+00:00Dr Hien Dinh Vanvanhiencompany221182@gmail.comTuan Anh Nguyentuananhcompa.mta@gmail.comHuy Mai Vanmaihuyloan@gmail.comThang Sai Manhsmtbk77@yahoo.comLong Tran Thanhtranthanhlongdank52@gmail.com<p>Copper alloy plug valves are used to close and switch hydraulic/pneumatic circuits in many fields, including 4-port plug valves used in the vertical balancing system of submarines. The 4-port plug valve has the advantage of a simple structure, including a body, plug, and other details. The valve body is usually manufactured by casting, then mechanically processed, and finally lapped between the plug and the body surface to seal. Due to the large number of ports, the valve body shape is complex, leading to the casting design of the valve body requiring strict requirements to avoid casting defects such as incomplete casting shape, shrinkage, gas porosity, etc. In this paper, the solution combines calculating the casting design to simulate and analyze the thermal field and casting defects, from there, choosing a reasonable casting design option and parameters, and finally, making the casting experiment for validation. The research results are the basis for implementing and perfecting valve body casting technology.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technologyhttps://online.jmst.info/index.php/jmst/article/view/978Research on building method of measuring the allowable slippage coefficient to serve the design of non-geodesic wound filamentary composite shell of revolution2024-02-26T03:39:55+00:00Ngọc Thanh Trầntntvtl@gmail.comVăn Ấm Bùikimam1994offich@gmail.comVăn Hiến Đinhvanhiencompany221182@gmail.com<p>Composite structures obtained by winding methods (cylinder, sphere, torus, etc.) are used in many fields. To form the structure, the fibers are impregnated with resin and spread onto the mandrel in a geodesic or non-geodetic trajectory. The non-geodetic trajectory of the fiber is an unbalanced trajectory, i.e., the fiber has a tendency to slip transversely. The slippage tendency of fiber is assessed by the slippage coefficient (l), which is the ratio between the geodesic (k<sub>g</sub>) and the normal curvature (k<sub>n</sub>), l = k<sub>g</sub>/k<sub>n</sub>. When the value of l is bigger than the allowable value ([l]), the fiber will be slipped. In this paper, from the fiber trajectory theory, a method of measuring the allowable slippage coefficient is built, and at the same time, the error prediction is due to the influence of the fiber width. Since then, the winding mandrel has been designed and made of POM plastic for experiments. Experiments were carried out on the winding machine MQC-01CT, the winding material is glass fiber with a width of 6 mm wetted with epoxy resin. The results show the average allowable slippage coefficient [l] = 0,195 with error Dλ = 0,063%. The results are the basis for determining the allowable slippage coefficient in different cases of composite and mandrel materials. At the same time, the measured values are the basis for calculating the structure and technology of winding the corresponding composite materials.</p>2024-02-25T00:00:00+00:00Copyright (c) 2024 Journal of Military Science and Technology