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Enhanced strength-ductility synergy in a gradient pseudo-precipitates heterostructured Al-2.5%Mg alloy:Design,fabrication,and deformation mechanism

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Journal of Materials science & technology 2024年第29期196卷 88-100页

作者： Renhao Wu Yeon Taek Choi Qingfeng Wu Xinxi Liu Dayong An Tianle Li Meng Li Hyoung Seop Kim Department of Plasticity Technology School of Materials Science&EngineeringShanghai Jiao Tong UniversityShanghai 200030China Graduate Institute of Ferrous&Eco Materials Technology Pohang University of Science and Technology37673South Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)37673South Korea School of Materials Science&Engineering Changsha University of Science&TechnologyChangsha 410114China Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722South Korea

Heterostructures of alloyed composites,comprising heterogeneous domains with dramatically different constitutive properties,hold remarkable potential to expand the realm of material design systems and resolve the tradeoffbetween strength and *** study introduces an innovative materials design method for synthesizing gradient pseudo-precipitates heterostructure(GPHS)in non-heat-treatable Al-2.5%Mg *** cost-effective mild steel as both the diffusion source and protective layer,this heterostructure is achieved through pin-less friction stir-assisted cyclic localized deformation *** Fe atoms diffuse across the interface by friction stir-induced heat conduction,forming Fe-Al second-phase particles in the Al alloy matrix.A rapid inter-diffusion mechanism is activated in conjunction with dense dislocation walls,grain boundaries,and sub-structures,resulting in the formation of *** pseudo-precipitates are ultimately dispersed in a gradient distribution throughout the entire thickness of the Al alloy matrix induced by localized incremental *** GPHSed Al-2.5%Mg alloy exhibits an enhanced synergy of strength and ductility,with a uniform elongation increase from 11%to 21.2%,while maintaining the *** strengthening and hardening mechanisms,such as solid solution strengthening,dislocation hardening,and second phase strengthening,work synergistically to promote mechanical ***,the hetero-deformation between hard pseudo-precipitates and soft Al alloy matrix induces additional strain hardening,leading to high *** work provides a fresh perspective on the design and fabrication of high-performance alloys with advanced heterostructures,especially for non-heat-treatable alloys.

关键词： Gradient pseudo-precipitates heterostructure Enhanced strength-ductility synergy Rapid diffusion Hetero-deformation induced strain hardening Al-2.5%Mg alloy

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Extreme sputtering:Epitaxy of multifunctional oxides heterostructures

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Journal of advanced Ceramics 2024年第12期13卷 1919-1930页

作者： Soo Young Jung Dong-Hun Han Ruiguang Ning Min-Seok Kim Hyung-Jin Choi Ho Won Jang Seung-Hyub Baek Electronic Materials Research Center Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Division of Nano&Information Technology KIST SchoolUniversity of Science and TechnologySeoul 02792Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Republic of Korea

This review provides an in-depth exploration of low-damage sputtering techniques and their importance in synthesizing high-quality epitaxial multifunctional oxide *** review examines the factors contributing to damages during sputtering and introduces strategies for minimizing these detrimental *** examples are provided to illustrate key milestones in the development of the sputtering technique,addressing critical issues such as maintaining stoichiometry when volatile species are included,achieving precise atomic-level control of interfaces,integrating an additional anion into oxides,selecting a particular phase from many possible polymorphs,and controlling the microstructure of thin ***,various defect mitigation strategies are discussed,including the use of miscut substrates,in-situ monitoring systems,and chemical buffer *** shedding light on the advancements and limitations in sputtering,this review not only enhances our present understanding of thin film deposition but also paves the way for future innovative sputtering techniques,holding tremendous potential for the exploration of new materials and their applications in various industries.

关键词： sputtering low damage ion bombardment epitaxial thin films functional oxides

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Conformal Ultrasound Patch for Real-Time Blood Flow Monitoring 38

Conformal Ultrasound Patch for Real-Time Blood Flow Monitori...

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38th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2025

作者： Lee, Taemin Park, Jongcheol Kim, Il-Seop Bang, Sangho Jung, Joontaek Lee, Hyunjoo J. Korea Advanced Institute of Science and Technology School of Electrical Engineering Korea Republic of National NanoFab Center Office of Nano Convergence Technology Korea Republic of Healcerion Co. Ltd. Korea Republic of

ISBN: (纸本)9798331508890

Wearable ultrasound systems are opening up new ultrasound applications that were previously not possible with conventional handheld probes, such as continuous blood flow monitoring, which address unmet clinical needs. The wearable ultrasound systems are rapidly advancing in terms of array order, array size, conformality with human skin, and form factors. Despite these advancements, current fabrication and packaging methods remain time-intensive and lack scalability, while the acoustic interface is inefficient for prolonged monitoring sessions. To address these issues, we present a two-dimensional (2D) conformal ultrasound patch developed for real-time continuous blood flow monitoring. A 2D conformal ultrasound patch is fabricated through a stable and efficient anisotropic conductive film (ACF) bonding and packaged with a silk layer which serves both as an adhesive and as an effective acoustic interface, enhancing long-term usability. A single element of the 2D array exhibits a transmit sensitivity of 5.7 kPa/Vpp and a receive sensitivity of 2.4 mVpp/kPa, which is 8.7 times higher than that of a commercial hydrophone. These acoustic properties are sufficient to monitor blood flow at 2 cm depth of the skin. © 2025 IEEE.

关键词： Piezoelectricity

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Penalty-driven enhanced self-supervised learning (Noise2Void) for CBCT denoising

Penalty-driven enhanced self-supervised learning (Noise2Void...

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Medical Imaging 2023: Physics of Medical Imaging

作者： Yun, Sungho Jeong, Uijin Kwon, Taejin Choi, Dain Lee, Taewon Ye, Sung-Joon Cho, Gyuseong Cho, Seungryong Department of Nuclear and Quantum Engineering Korea Advanced Institution of Science and Technology Daejeon Korea Republic of Graduate School of Convergence Science and Technology Seoul National University Seoul Korea Republic of

ISBN: (纸本)9781510660311

Self-supervised learning for CT image denoising is a promising technique because it does not require clean target data that are usually unavailable in the clinic. Noise2void (N2V) is one of the famous methods to denoise the image without paired target data and it has been used to denoise optical images and also medical images such as MRI, and CT. However, the performance of the N2V is still limited due to the restricted receptive field of the network and it decreases the prediction performance for CT images that have complex image context and non-uniform Poisson random noise. Thus, we proposed enhanced N2V that utilizes penalty-driven network optimization to further denoise the images while preserving the important details. We used the total variation term to further denoise the image and also the laplacian pyramids term to preserve the important edges of the image. The degree of the influence of each penalty term is controlled by the hyperparameter value and they are optimized to achieve the best image quality in terms of noise level and structure sharpness. For the experiment, the real dental CBCT projection data were used to train the network in the projection domain. After the network training, the test results were reconstructed and compared at each different dose level. Meanwhile, PSNR, SNR, and a line profile were also evaluated to quantitatively compare the original FDK images, and proposed method. In conclusion, the proposed method achieved further denoises the image than N2V even preserving the details. By penalty-driven optimization, the network was able to learn the spectral features of the image while still the receptive field is limited to avoid identity mapping. We hope that our method would increase the practical utility of network-based CT images denoising that usually the target data are unavailable. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Signal to noise ratio

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Surface Modification of 3D Printed Biomedical Scaffolds Through an Electron Beam Processe 17

Surface Modification of 3D Printed Biomedical Scaffolds Thro...

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17th IEEE International Conference on Nano/Molecular Medicine and Engineering, NANOMED 2024

作者： Cha, Goeun Woo, Jonghyeon Noh, Jeongsik Park, Jongsung Kyungpook National University School of Advanced Science and Technology Convergence Graduate School Sangju37224 Korea Republic of Kyungpook National University Department of Precision Mechanical Engineering Sangju37224 Korea Republic of

ISBN: (纸本)9798331516994

This study introduces a method for employing electron beam processing to effectuate both physical and chemical modifications to the surface of 3D printed biomedical scaffolds. Generally, 3D printed scaffolds exhibit certain limitations, including rough surface textures and dimensional inaccuracies, which hinder their applicability in medical contexts. To mitigate these issues, we implemented the electron beam technique to enhance surface smoothness and facilitate chemical alterations. The proposed method is not only efficient in polishing the surfaces of the printed scaffolds but also capable of processing a substantial number of samples within a brief timeframe. This technique holds potential for various biomedical implant devices and can be adapted for use with a range of metallic materials and polymer printing. Notably, the electron beam process described herein relies solely on heat treatment via electron application, thereby ensuring the complete elimination of any potential adverse effects that may arise during clinical trials related to the materials used. © 2024 IEEE.

关键词： Scaffolds (biology)

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Autonomous self-healing in a stretchable polybutadiene-based urethane and eutectic gallium indium conductive composite

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npj Flexible Electronics 2024年第1期8卷 74-88页

作者： Tran Duc Khanh Jinho Joo Jong-Woong Kim Department of Smart Fab Technology Sungkyunkwan UniversitySuwonSouth Korea School of Advanced Materials Science&Engineering Sungkyunkwan UniversitySuwonSouth Korea Department of Semiconductor Convergence Engineering Sungkyunkwan UniversitySuwonSouth Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwonSouth Korea

In the burgeoning field of wearable electronics,flexible and durable conductors that can maintain consistent electrical properties under various conditions are critically *** research introduces a novel composite material comprising eutectic gallium-indium(EGaIn)and a polybutadiene-based urethane(PBU)specifically designed to address this ***,renowned for its superior conductivity due to its liquid state at room temperature,is strategically combined with PBU,which offers inherent flexibility and remarkable self-healing capabilities derived from reversible Diels–Alder ***,the composite maintains exceptional electrical resistance stability,withstanding mechanical strains up to 135%without compromising *** material’s self-healing capability is attributed to the autonomous mending properties of EGaIn and the reversible Diels–Alder reactions in the PBU *** result is an efficient restoration of the composite’s original properties upon incurring ***,the composite’s adaptability is showcased through its printability,allowing for precise patterning conducive to custom-designed wearable devices.

关键词： eutectic wear composite

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Cation Effect on the Electrochemical Platinum Dissolution

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Journal of the American Chemical Society 2025年第5期147卷 4667-4674页

作者： Kim, Haesol Kim, Minho M. Cho, Junsic Lee, Seunghoon Kim, Dong Hyun Shin, Seung-Jae Utsunomiya, Tomohiko Goddard, William A. Katayama, Yu Kim, Hyungjun Choi, Chang Hyuck Department of Chemistry Pohang University of Science and Technology Pohang37673 Korea Republic of Department of Chemistry Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology Ulsan44919 Korea Republic of SANKEN Osaka University Mihogaoka Ibaraki5670047 Japan Department of Engineering Osaka University Yamadaoka Suita5650871 Japan Materials and Process Simulation Center California Institute of Technology PasadenaCA91125 United States Institute for Convergence Research and Education in Advanced Technology Yonsei University Seoul03722 Korea Republic of

Ensuring the stability of electrocatalysts is paramount to the success of electrochemical energy conversion devices. Degradation is a fundamental process involving the release of positively charged metal ions into the electric double layer (EDL) and their subsequent diffusion into the bulk electrolyte. However, despite its vital importance in achieving prolonged electrocatalysis, the underlying causality of catalyst dissolution with the EDL structure remains largely unknown. Here, we show that electrochemical Pt dissolution is strongly influenced by the identity of the alkali metal cation (AM+) in the electrolyte. By monitoring Pt dissolution in real-time, we found a trend of reduced Pt leaching in the sequence Li+ > Na+ > K+ > Cs+. Our computational predictions suggest that interfacial OH- concentration plays a pivotal role in Pt dissolution, where OH- facilitates the outward diffusion of dissolved Pt ions into the bulk electrolyte by neutralizing the Ptz+ species, thereby screening the migration force for their redeposition. Combined with this theoretical result, we verify a strong correlation between the amount of dissolved Pt and the hydrolysis pKa or acidity of AM+, indicating that the AM+ identity determines the local OH- concentration and thereby modifies the amount of Pt dissolution. Our results underscore the need to tune the EDL structure to achieve durable electrocatalysis, a promising area for future research. © 2025 American Chemical Society.

关键词： Metal ions

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Rational strategy for power doubling of monolithic multijunction Ⅲ-Ⅴ photovoltaics by accommodating attachable scattering waveguides

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Light(science & Applications) 2024年第11期13卷 2734-2744页

作者： Shin Hyung Lee Hyo Jin Kim Jae-Hyun Kim Gwang Yeol Park Sun-Kyung Kim Sung-Min Lee School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Optoelectronic Convergence Research Center Korea Photonics Technology InstituteGwangju 61007Republic of Korea Department of Applied Physics Kyung Hee UniversityYongin 17104Republic of Korea Department of Electrical Engineering Hanyang UniversitySeoul 04763Republic of Korea Division of Materials Science and Engineering Hanyang UniversitySeoul 04763Republic of Korea

While waveguide-based light concentrators offer significant advantages,their application has not been considered an interesting option for assisting multijunction or other two-terminal tandem solar *** this study,we present a simple yet effective approach to enhancing the output power of transfer-printed multijunction InGaP/GaAs solar *** utilizing a simply combinable waveguide concentrator featuring a coplanar waveguide with BaSO4 Mie scattering elements,we enable the simultaneous absorption of directly illuminated solar flux and indirectly waveguided *** deployment of cells is optimized for front-surface photon collection in monofacial *** systematic comparisons across various waveguide parameters,supported by both experimental and theoretical quantifications,we demonstrate a remarkable improvement in the maximum output power of a 26%-efficient cell,achieving an enhancement of~93%with the integration of the optimal scattering ***,a series of supplementary tests are conducted to explore the effective waveguide size,validate enhancements in arrayed cell module performance,and assess the drawbacks associated with rear *** findings provide a comprehensive understanding of our proposed approach towards advancing multi-junction photovoltaics.

关键词： waveguide scattering power

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advanced flexible humidity sensors:structures,techniques,mechanisms and performances

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Frontiers of Materials science 2023年第4期17卷 37-53页

作者： Yuzhe Zhang Yuxi Liu Lifei Lin Man Zhou Wang Zhang Liwei Lin Zhongyu Li Yuanzhe Piao Sun Ha Paek School of Environmental Science and Engineering Changzhou UniversityChangzhou 213164China Department of Applied Bioengineering Graduate School of Convergence Science and TechnologySeoul National UniversitySeoul 08826Republic of Korea Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China Department of Neurosurgery Movement Disorder CenterSeoul National University HospitalSeoul 03080Republic of Korea Advanced Institutes of Convergence Technology Suwon-siGyeonggi-do 16229Republic of Korea

Flexible humidity sensors are widely used in many fields,such as environmental monitoring,agricultural soil moisture content determination,food quality monitoring and healthcare ***,it is essential to measure humidity accurately and reliably in different *** materials have been the focusing substrates of humidity sensors because of their rich surface chemical properties and structural *** addition,flexible materials have superior ductility for different *** this review,we have summarized several sensing mechanisms,processing techniques,sensing layers and substrates for specific humidity sensing ***,we have sorted out some cases of flexible humidity sensors based on different functional *** hope this paper can contribute to the development of flexible humidity sensors in the future.

关键词： flexible composite manufacturing technology sensing mechanism humidity sensor

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Robust Real-Time Sampling-Based Motion Planner for Autonomous Vehicles in Narrow Environments

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IEEE Transactions on Automation science and Engineering 2025年 22卷 16250-16265页

作者： Minsoo Kim Arthur Esquerre-Pourtère Jaeheung Park Department of Intelligence and Information Graduate School of Convergence Science and Technology Seoul National University Seoul Republic of Korea Department of Intelligence and Information Graduate School of Convergence Science and Technology and ASRI AIIS Seoul National University Seoul Republic of Korea Advanced Institute of Convergence Technology Suwon Republic of Korea

Real-time sampling-based planners increasingly use learned sampling distributions for faster planning in autonomous vehicles. These planners employ a neural network to predict the optimal path and bias some samples toward the path. However, inherent prediction inaccuracies of the network often lead to suboptimal paths, especially in narrow spaces. Learned samples should be used carefully based on accuracy, as inaccurate samples can degrade planning performance. To address this problem, this paper proposes Learned Adaptive Anytime TargetTree-RRT* (LA3T*) algorithm. The proposed planner introduces the adaptive biasing ratio. The approach learns to assess the reliability of the learned distribution using the network’s confidence. This confidence approximates a proper ratio of learned samples used, thereby adaptively maximizing planning performance while considering a level of prediction accuracy. Furthermore, the LA3T* algorithm incorporates the target tree algorithm. The goal pose is replaced with a set (target tree) of pre-defined optimal path segments, reducing computational efforts in narrow regions. Experiments in various driving tasks explore the benefits of each component through ablation studies. The proposed algorithm significantly increases the success rate and reduces the path length in simulated and real-world scenarios compared to other sampling-based methods. Note to Practitioners—This work was motivated by the need to develop a practical real-time motion planning algorithm for autonomous vehicles in narrow environments. Although learning-based sampling methods have been actively explored, their planning performance often degrades due to inaccurate predictions from the learned model, limiting their practicability and robustness. The Learned Adaptive Anytime TargetTree-RRT* (LA3T*) algorithm addresses this problem by adaptively leveraging the learned model based on its reliability and integrating it with the target tree algorithm. Experiments conducted in

关键词： Planning Prediction algorithms Real-time systems Neural networks Heuristic algorithms Approximation algorithms Accuracy Autonomous vehicles Vehicle dynamics Training

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