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A Study on Design and Microwave Characteristics of a RF/IR Multispectral Absorber 射频/红外多光谱吸收器的设计和微波特性研究
Journal of the Korea Institute of Military Science and Technology Pub Date : 2024-06-05 DOI: 10.9766/kimst.2024.27.3.311
Minah Yoon, Suwan Jeon, Youngeun Ra, Yerin Jo, Wonwoo Choi, Yukyoung Lee, Kwangseop Kim, Jonghak Lee, Kichul Kim, Taein Choi, Hakjoo Lee
{"title":"A Study on Design and Microwave Characteristics of a RF/IR Multispectral Absorber","authors":"Minah Yoon, Suwan Jeon, Youngeun Ra, Yerin Jo, Wonwoo Choi, Yukyoung Lee, Kwangseop Kim, Jonghak Lee, Kichul Kim, Taein Choi, Hakjoo Lee","doi":"10.9766/kimst.2024.27.3.311","DOIUrl":"https://doi.org/10.9766/kimst.2024.27.3.311","url":null,"abstract":"In this paper, a design for a radio frequency(RF) and infrared(IR) absorber with metasurfaces is discussed in microwave frequency bands. The RF absorber includes double layers of metasurfaces to operate in S- and X-bands. Effects of sheet resistance of the metasurfaces and thicknesses of dielectric supporting layers on reflection responses are investigated. An IR stealth layer incorporates an array of conductive grids with slits to reflect IR signals but to transmit RF signals and visible rays. Periodicity of the grids and slits is studied for transmission responses in the X-band and a surface area ratio. Reflection responses of the RF/IR multispectral absorber are found to be lower than -10 dB and -16 dB in the S- and X-bands, respectively, from full-wave simulation. Finally, the RF/IR multispectral absorber is fabricated and its reflection responses are measured to verify designed performance.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141386120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ferromagnetic Target Detection in the Ocean Using Drone-based Magnetic Anomaly Detection 利用无人机磁异常探测海洋中的铁磁目标
Journal of the Korea Institute of Military Science and Technology Pub Date : 2024-06-05 DOI: 10.9766/kimst.2024.27.3.338
Sinhyuk Yim, Dongkyu Kim, J. Yoon, E. Bang, Seokmin Oh, Bona Kim, K. Shim, Sangkyung Lee
{"title":"Ferromagnetic Target Detection in the Ocean Using Drone-based Magnetic Anomaly Detection","authors":"Sinhyuk Yim, Dongkyu Kim, J. Yoon, E. Bang, Seokmin Oh, Bona Kim, K. Shim, Sangkyung Lee","doi":"10.9766/kimst.2024.27.3.338","DOIUrl":"https://doi.org/10.9766/kimst.2024.27.3.338","url":null,"abstract":"Magnetic anomaly signals from the ferromagnetic targets such as ships in the sea are measured by drone-based magnetic anomaly detection. A quantum magnetometer is suspended from the drone by 4 strings. Flight altitude and speed of drone are 100 m and 5 m/s, respectively. We obtain magnetic anomaly signals of few nT from the ships clearly. We analyze the signal characteristics by the ferromagnetic target through simulation using COMSOL multiphysics.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141386645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Real-virtual Point Cloud Augmentation Method for Test and Evaluation of Autonomous Weapon Systems 用于测试和评估自主武器系统的真实-虚拟点云增强方法
Journal of the Korea Institute of Military Science and Technology Pub Date : 2024-06-05 DOI: 10.9766/kimst.2024.27.3.375
Saedong Yeo, Gyuhwan Hwang, Hyunsung Tae
{"title":"Real-virtual Point Cloud Augmentation Method for Test and Evaluation of Autonomous Weapon Systems","authors":"Saedong Yeo, Gyuhwan Hwang, Hyunsung Tae","doi":"10.9766/kimst.2024.27.3.375","DOIUrl":"https://doi.org/10.9766/kimst.2024.27.3.375","url":null,"abstract":"Autonomous weapon systems act according to artificial intelligence-based judgement based on recognition through various sensors. Test and evaluation for various scenarios is required depending on the characteristics that artificial intelligence-based judgement is made. As a part of this approach, this paper proposed a LiDAR point cloud augmentation method for mixed-reality based test and evaluation. The augmentation process is achieved by mixing real and virtual LiDAR signals based on the virtual LiDAR synchronized with the pose of the autonomous weapon system. For realistic augmentation of test and evaluation purposes, appropriate intensity values were inserted when generating a point cloud of a virtual object and its validity was verified. In addition, when mixing the generated point cloud of the virtual object with the real point cloud, the proposed method enhances realism by considering the occlusion phenomenon caused by the insertion of the virtual object.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141384139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Two Circle-based Aircraft Head-on Reinforcement Learning Technique using Curriculum 基于两个圆的飞机正面强化学习技术
Journal of the Korea Institute of Military Science and Technology Pub Date : 2023-08-05 DOI: 10.9766/kimst.2023.26.4.352
Insu Hwang, Jungho Bae
{"title":"Two Circle-based Aircraft Head-on Reinforcement Learning Technique using Curriculum","authors":"Insu Hwang, Jungho Bae","doi":"10.9766/kimst.2023.26.4.352","DOIUrl":"https://doi.org/10.9766/kimst.2023.26.4.352","url":null,"abstract":"Recently, AI pilots using reinforcement learning are developing to a level that is more flexible than rule-based methods and can replace human pilots. In this paper, a curriculum was used to help head-on combat with reinforcement learning. It is not easy to learn head-on with a reinforcement learning method without a curriculum, but in this paper, through the two circle-based head-on air combat learning technique, ownship gradually increase the difficulty and become good at head-on combat. On the two-circle, the ATA angle between the ownship and target gradually increased and the AA angle gradually decreased while learning was conducted. By performing reinforcement learning with and w/o curriculum, it was engaged with the rule-based model. And as the win ratio of the curriculum based model increased to close to 100 %, it was confirmed that the performance was superior.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74084817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Development of the Real Time Target Simulator for the RF Signal of Electronic Warfare using VST and FPGA 基于VST和FPGA的电子战射频信号实时目标模拟器的研制
Journal of the Korea Institute of Military Science and Technology Pub Date : 2023-08-05 DOI: 10.9766/kimst.2023.26.4.324
Sanghun Song
{"title":"The Development of the Real Time Target Simulator for the RF Signal of Electronic Warfare using VST and FPGA","authors":"Sanghun Song","doi":"10.9766/kimst.2023.26.4.324","DOIUrl":"https://doi.org/10.9766/kimst.2023.26.4.324","url":null,"abstract":"In this paper, the target simulator for RF signals was developed by using VST(Vector Signal Transceiver) and set by real-time signal processing SW programs. A function to process RF signals using FPGA(Field Programmable Gate Array) board was designed. The system functions capable of data processing, raw signals monitoring, target signals(simulated range, velocity) generating and RF environments data analyzing were implemented. And the characteristics of modulated signal were analyzed in RF environment. All function of programs for processing RF signal have options to store signal data and to manage the data. The validity of the signal simulation was confirmed through verification of simulated signal results.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75777289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Static Ejection Test for Separation Analysis of 2,000lb-Class Store 2000lb级储层分离分析静态弹射试验
Journal of the Korea Institute of Military Science and Technology Pub Date : 2023-08-05 DOI: 10.9766/kimst.2023.26.4.344
Byung-Chul Shin, Young-hee Jo, Min-soo Kim
{"title":"Static Ejection Test for Separation Analysis of 2,000lb-Class Store","authors":"Byung-Chul Shin, Young-hee Jo, Min-soo Kim","doi":"10.9766/kimst.2023.26.4.344","DOIUrl":"https://doi.org/10.9766/kimst.2023.26.4.344","url":null,"abstract":"Static ejection tests were conducted using the 2,000lb-Class Store to provide ejector model for the store separation simulation. In this study, static ejection test device for 2,000lb-class store was constructed and reaction force applied to store was measured over time. In addition, the trajectories of the ejected store were obtained using photogrammetry and compared with the simulations using developed ejector model. The results of the static ejection test were analyzed to determine the cartridge-orifice combination to be used for store separation. Flight tests were performed by applying the analysis results and verified that the store was safely separated from the aircraft.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78725677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of the Power Assist System for High Efficiency and Lightweight Wearable Robot in Unstructured Battlefield 非结构化战场中高效轻量化可穿戴机器人动力辅助系统的研究
Journal of the Korea Institute of Military Science and Technology Pub Date : 2023-08-05 DOI: 10.9766/kimst.2023.26.4.313
Huichang Park
{"title":"Development of the Power Assist System for High Efficiency and Lightweight Wearable Robot in Unstructured Battlefield","authors":"Huichang Park","doi":"10.9766/kimst.2023.26.4.313","DOIUrl":"https://doi.org/10.9766/kimst.2023.26.4.313","url":null,"abstract":"The wearable robot system is designed to assist human skeletal and muscular systems for enhancing user’s abilities in various fields, including medical, industrial, and military. The military has an expanding need for wearable robots with the integration of surveillance/control systems and advanced equipment in unstructured battlefield environments. However, there is a lack of research on the design and mechanism of wearable robots, especially for power assist systems. This study proposes a lightweight wearable robot system that provides comfortable wear and muscle support effects in various movements for soldiers performing high-strength and endurance missions. The Power assist mechanism is described and verified, and the tasks that require power assist are analyzed. This study explain the system including its driving mechanism, control system, and mechanical design. Finally, the performance of the robot is verified through experiments and evaluations, demonstrating its effectiveness in muscle support.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86584483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on Enhancing Training Efficiency of MARL for Swarm Using Transfer Learning 利用迁移学习提高群体MARL训练效率的研究
Journal of the Korea Institute of Military Science and Technology Pub Date : 2023-08-05 DOI: 10.9766/kimst.2023.26.4.361
Seulgi Yi, Kwon-il Kim, Suk-Whoan Yoon
{"title":"Study on Enhancing Training Efficiency of MARL for Swarm Using Transfer Learning","authors":"Seulgi Yi, Kwon-il Kim, Suk-Whoan Yoon","doi":"10.9766/kimst.2023.26.4.361","DOIUrl":"https://doi.org/10.9766/kimst.2023.26.4.361","url":null,"abstract":"Swarm has recently become a critical component of offensive and defensive systems. Multi-agent reinforcement learning(MARL) empowers swarm systems to handle a wide range of scenarios. However, the main challenge lies in MARL’s scalability issue - as the number of agents increases, the performance of the learning decreases. In this study, transfer learning is applied to advanced MARL algorithm to resolve the scalability issue. Validation results show that the training efficiency has significantly improved, reducing computational time by 31 %.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91428877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Drone based Magnetic Anomaly Detection to detect Ferromagnetic Target 基于无人机的磁异常检测方法检测铁磁目标
Journal of the Korea Institute of Military Science and Technology Pub Date : 2023-08-05 DOI: 10.9766/kimst.2023.26.4.335
S. H. Yim, Donkyu Kim, Ji Hun Yoon, Bona Kim, Eun Seok Bang, K. Shim, Sangkyung Lee, Jong-shick Oh
{"title":"Drone based Magnetic Anomaly Detection to detect Ferromagnetic Target","authors":"S. H. Yim, Donkyu Kim, Ji Hun Yoon, Bona Kim, Eun Seok Bang, K. Shim, Sangkyung Lee, Jong-shick Oh","doi":"10.9766/kimst.2023.26.4.335","DOIUrl":"https://doi.org/10.9766/kimst.2023.26.4.335","url":null,"abstract":"Drone based Magnetic Anomaly Detection measure a magnetic anomaly signal from the ferromagnetic target on the ground. We conduct a magnetic anomaly detection with 9 ferromagnetic targets on the ground. By removing the magnetic field measured in the absence of ferromagnetic targets from the experimental value, the magnetic anomaly signal is clearly measured at an altitude of 100 m. We analyze the signal characteristics by the ferromagnetic target through simulation using COMSOL multiphysics. The simulation results are within the GPS error range of the experimental results.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76910243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of the Effect of Deep-learning Super-resolution for Fragments Detection Performance Enhancement 深度学习超分辨率对增强碎片检测性能的影响分析
Journal of the Korea Institute of Military Science and Technology Pub Date : 2023-06-05 DOI: 10.9766/kimst.2023.26.3.234
Yuseok Lee
{"title":"Analysis of the Effect of Deep-learning Super-resolution for Fragments Detection Performance Enhancement","authors":"Yuseok Lee","doi":"10.9766/kimst.2023.26.3.234","DOIUrl":"https://doi.org/10.9766/kimst.2023.26.3.234","url":null,"abstract":"The Arena Fragmentation Test(AFT) is designed to analyze warhead performance by measuring fragmentation data. In order to evaluate the results of the AFT, a set of AFT images are captured by high-speed cameras. To detect objects in the AFT image set, ResNet-50 based Faster R-CNN is used as a detection model. However, because of the low resolution of the AFT image set, a detection model has shown low performance. To enhance the performance of the detection model, Super-resolution(SR) methods are used to increase the AFT image set resolution. To this end, The Bicubic method and three SR models: ZSSR, EDSR, and SwinIR are used. The use of SR images results in an increase in the performance of the detection model. While the increase in the number of pixels representing a fragment flame in the AFT images improves the Recall performance of the detection model, the number of pixels representing noise also increases, leading to a slight decreases in Precision performance. Consequently, the F1 score is increased by up to 9 %, demonstrating the effectiveness of SR in enhancing the performance of the detection model.","PeriodicalId":17292,"journal":{"name":"Journal of the Korea Institute of Military Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79780132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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