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Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

ENERGY & ENVIRONMENTAL MATERIALS 2024年第6期7卷 230-237页

作者： ha, jong-woon Eom, Seung Hun Cha, Bo Kyung Song, Seyeong Eun, Hyeong Ju Kim, jong H. Park, jong Mok Kim, Bongsoo Park, Byoungwook Ko, Seo-Jin Yoon, Sung Cheol Lee, Changjin Jung, In Hwan Hwang, Do-Hoon Pusan Natl Univ Chem Inst Funct Mat Dept Chem Busan 46241 South Korea Korea Res Inst Chem Technol KRICT Div Adv Energy Mat Res Ctr Daejeon 34114 South Korea Korea Electrotechnol Res Inst KERI Electromed Device Res Ctr Ansan 15588 South Korea Ulsan Natl Inst Sci & Technol UNIST Grad Sch Carbon Neutral Sch Energy & Chem Engn Ulsan 44919 South Korea Ajou Univ Dept Mol Sci & Technol Suwon 16449 South Korea Korea Res Inst Chem Technol Res Ctr Adv Specialty Chem Ulsan 44412 South Korea Ulsan Natl Inst Sci & Technol UNIST Dept Chem Ulsan 44919 South Korea hanyang Univ Dept Organ & Nano Engn Human Tech Convergence Program 222 Wangsimni Ro Seoul 04763 South Korea

The development of portable X-ray detectors is necessary for diagnosing fractures in unconscious patients in emergency situations. However, this is quite challenging because of the heavy weight of the scintillator and silicon photodetectors. The weight and thickness of X-ray detectors can be reduced by replacing the silicon layer with an organic photodetectors. This study presents a novel bithienopyrroledione-based polymer donor that exhibits excellent photodetection properties even in a thick photoactive layer (similar to 700 nm), owing to the symmetric backbone and highly soluble molecular structure of bithienopyrroledione. The ability of bithienopyrroledione-based polymer donor to strongly suppress the dark current density (J(d) similar to 10(-10) A cm(-2)) at a negative bias (-2.0 V) while maintaining high responsivity (R = 0.29 A W-1) even at a thickness of 700 nm results in a maximum shot-noise-limited specific detectivity of D-sh* = 2.18 x 10(13) Jones in the organic photodetectors. Printed organic photodetectors are developed by slot-die coating for use in X-ray detectors, which exhibit D-sh* = 2.73 x 10(12) Jones with clear rising (0.26 s) and falling (0.29 s) response times upon X-ray irradiation. Detection reliability is also proven by linear response of the X-ray detector, and the X-ray detection limit is 3 mA.

关键词： low dark current low detection limit organic photodetector printable X-ray DETECTORS PHOTOCONDUCTORS SENSITIVITY

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Two-stage dynamic recrystallization and texture evolution in Al-7Mg alloy during hot torsion

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1900-1911页

作者： Kwang Tae Son Chang Hee Cho Myoung Gyun Kim Ji woon Lee School of Mechanical Industrialand Manufacturing EngineeringOregon State UniversityCorvallis OR 97331USA Department of Materials Science Engineering Northwestern UniversityEvanston IL 60208USA Research Institute of Industrial Science and Technology(RIST) Pohang 37673Rep.of Korea Division of Advanced Materials Engineering Kongju National UniversityCheonan 31080Rep.of Korea Center for Advanced Materials and Parts of Powders Kongju National UniversityCheonan 31080Rep.of Korea

Hot torsion tests were performed on the Al-7Mg alloy at the temperature ranging from 300 to 500℃ and strain rates between 0.05 and 5 s^(-1) to explore the progressive dynamic recrystallization(DRX)and texture *** DRX behavior of the alloy manifested two distinct stages:Stage 1 at strain of≤2 and Stage 2 at strains of≥*** Stage 1,there was a slight increase in the DRXed grain fraction(X_(DRX))with predominance of discontinuous DRX(DDRX),followed by a modest change in X_(DRX) until the transition to Stage *** 2 was marked by an accelerated rate of DRX,culminating in a substantial final X_(DRX) of~*** backscattered diffraction(EBSD)analysis on a sample in Stage 2 revealed that continuous DRX(CDRX)predominantly occurred within the(121)[001]grains,whereas the(111)[110]grains underwent a geometric DRX(GDRX)evolution without a noticeable sub-grain ***,a modified Avrami’s DRX kinetics model was utilized to predict the microstructural refinement in the Al-7Mg alloy during the DRX *** this kinetics model did not accurately capture the DDRX behavior in Stage 1,it effectively simulated the DRX rate in Stage *** texture index was employed to assess the evolution of the texture isotropy during hot-torsion test,demonstrating significant improvement(>75%)in texture randomness before the commencement of Stage *** initial texture evolution is attributed to the rotation of parent grains and the substructure evolution,rather than to an increase in X_(DRX).

关键词： Al-7Mg alloys hot deformation hot torsion tests dynamic recrystazlliation microstructure texture

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Advances in Wireless,Batteryless,Implantable Electronics for Real‑Time,Continuous Physiological Monitoring

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Nano-Micro Letters 2024年第3期16卷 254-302页

作者： Hyeonseok Kim Bruno Rigo Gabriella Wong Yoon Jae Lee woon‑Hong Yeo IEN Center for Wearable Intelligent Systems and Healthcare Georgia Institute of TechnologyAtlantaGA 30332USA George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA School of Electrical and Computer Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Wallace H.Coulter Department of Biomedical Engineering Georgia Tech and Emory University School of MedicineAtlantaGA 30332USA Parker H.Petit Institute for Bioengineering and Biosciences Institute for MaterialsInstitute for Robotics and Intelligent MachinesGeorgia Institute of TechnologyAtlantaGA 30332USA

This review summarizes recent progress in developing wireless,batteryless,fully implantable biomedical devices for real-time continuous physiological signal monitoring,focusing on advancing human health *** considerations,such as biological constraints,energy sourcing,and wireless communication,are discussed in achieving the desired performance of the devices and enhanced interface with human *** addition,we review the recent achievements in materials used for developing implantable systems,emphasizing their importance in achieving multi-functionalities,biocompatibility,and *** wireless,batteryless devices offer minimally invasive device insertion to the body,enabling portable health monitoring and advanced disease ***,we summarize the most recent practical applications of advanced implantable devices for human health care,highlighting their potential for immediate commercialization and clinical uses.

关键词： Implantable electronics Biomedical systems Batteryless devices Wireless electronics Physiological signal monitoring

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Defect engineering in transition-metal(Fe,Co,andNi)-based electrocatalysts for water splitting

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Carbon Energy 2024年第6期6卷 165-199页

作者： Kaili Wu Chaojie Lyu Jiarun Cheng Weifan Ding Jiwen Wu Qian Wang woon-Ming Lau Jinlong Zheng Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijingChina School of Chemistry and Chemical Engineering Linyi UniversityLinyiChina Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijingChina Shunde Innovation School University of Science and Technology BeijingFoshanChina

Electrocatalytic water splitting seems to be an efficient strategy to deal with increasingly serious environmental problems and energy crises but still suffers from the lack of stable and efficient *** practical electrocatalysts by introducing defect engineering,such as hybrid structure,surface vacancies,functional modification,and structural distortions,is proven to be a dependable solution for fabricating electrocatalysts with high catalytic activities,robust stability,and good *** review is an overview of some relevant reports about the effects of defect engineering on the electrocatalytic water splitting performance of *** detail,the types of defects,the preparation and characterization methods,and catalytic performances of electrocatalysts are presented,emphasizing the effects of the introduced defects on the electronic structures of electrocatalysts and the optimization of the intermediates'adsorption energy throughout the ***,the existing challenges and personal perspectives of possible strategies for enhancing the catalytic performances of electrocatalysts are *** in-depth understanding of the effects of defect engineering on the catalytic performance of electrocatalysts will light the way to design high-efficiency electrocatalysts for water splitting and other possible applications.

关键词： defect engineering electrocatalytic water splitting element doping interfacial engineering vacancy

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Machine-learned wearable sensors for real-time hand-motion recognition: toward practical applications

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National Science Review 2024年第2期11卷 231-263页

作者： Kyung Rok Pyun Kangkyu Kwon Myung Jin Yoo Kyun Kyu Kim Dohyeon Gong woon-Hong Yeo Seungyong han Seung Hwan Ko Department of Mechanical Engineering Seoul National University IEN Center for Human-Centric Interfaces and Engineering Institute for Electronics and NanotechnologyGeorgia Institute of Technology School of Electrical and Computer Engineering Georgia Institute of Technology Department of Chemical Engineering Stanford University Department of Mechanical Engineering Ajou University George W.Woodruff School of Mechanical Engineering Georgia Institute of Technology Institute of Advanced Machinery and Design(SNU-IAMD) Seoul National University

Soft electromechanical sensors have led to a new paradigm of electronic devices for novel motion-based wearable applications in our daily lives. However, the vast amount of random and unidentified signals generated by complex body motions has hindered the precise recognition and practical application of this technology. Recent advancements in artificial-intelligence technology have enabled significant strides in extracting features from massive and intricate data sets, thereby presenting a breakthrough in utilizing wearable sensors for practical applications. Beyond traditional machine-learning techniques for classifying simple gestures, advanced machine-learning algorithms have been developed to handle more complex and nuanced motion-based tasks with restricted training data sets. Machine-learning techniques have improved the ability to perceive, and thus machine-learned wearable soft sensors have enabled accurate and rapid human-gesture recognition, providing real-time feedback to users. This forms a crucial component of future wearable electronics, contributing to a robust human–machine interface. In this review, we provide a comprehensive summary covering materials, structures and machine-learning algorithms for hand-gesture recognition and possible practical applications through machine-learned wearable electromechanical sensors.

关键词： wearable sensor soft electronics artificial intelligence machine learning human–machine interfaces gesture recognition

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基于时间序列和改进随机森林算法的混凝土价格趋势预测

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运筹与管理 2024年第6期33卷 132-138页

作者：刘庆黄明浩 LEE woon-Seek 淮南师范学院经济与管理学院安徽淮南232038 国立釜庆大学技术经营专门大学院韩国釜山48547

有效而准确的预测商品混凝土价格变动趋势,对各类建筑的施工规划具有重要意义。相比其他预测模型,随机森林模型具有更高的预测精度。然而不同的数据结构都有其独特之处,针对特定数据结构进行模型优化,有助于提高算法在特定数据上的处理... 详细信息

有效而准确的预测商品混凝土价格变动趋势,对各类建筑的施工规划具有重要意义。相比其他预测模型,随机森林模型具有更高的预测精度。然而不同的数据结构都有其独特之处,针对特定数据结构进行模型优化,有助于提高算法在特定数据上的处理性能。我们针对时间序列分类(TSC:Time Series Classification)的特征提出一种改进随机森林算法。首先将随机森林创建训练子集时的随机抽样调整为倾斜抽样,然后将决策树分裂时的随机特征向量抽样调整为分层抽样,最后以加权投票取代平均投票。实证结果表明相比原始随机森林算法,改进模型具有明显优势,对商品混凝土价格变动的预测准确率达98.4%,预测精度、召回率和F1评分分别为:98.7%,98.2%,98.4%,可以实现了商品混凝土价格变动趋势的精准预测。

关键词：价格趋势预测时间序列分类优化混凝土

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Improved MIMO Signal Detection Based on DNN in MIMO-OFDM System

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Computers, Materials & Continua 2022年第2期70卷 3625-3636页

作者： Jae-Hyun Ro jong-Gyu ha woon-Sang Lee Young-Hwan You Hyoung-Kyu Song Department of Convergence Engineering for Intelligent Drone Sejong UniversitySeoul05006Korea Department of Information and Communication Engineering Convergence Engineering for Intelligent DroneSejong UniversitySeoul05006Korea Department of Computer Engineering Convergence Engineering for Intelligent DroneSejong UniversitySeoul05006Korea

This paper proposes the multiple-input multiple-output(MIMO)detection scheme by using the deep neural network(DNN)based ensemble machine learning for higher error performance in wireless communication *** the MIMO detection based on the ensemble machine learning,all learning models for the DNN are generated in offline and the detection is performed in online by using already learned *** the offline learning,the received signals and channel coefficients are set to input data,and the labels which correspond to transmit symbols are set to output *** the online learning,the perfectly learned models are used for signal detection where the models have fixed bias and *** performance improvement,the proposed scheme uses the majority vote and the maximum probability as the methods of the model combinations for obtaining diversity gains at the MIMO *** simulation results show that the proposed scheme has improved symbol error rate(SER)performance without additional receive antennas.

关键词： MIMO DNN ensemble machine learning ML

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Multifunctional catalytic sites regulation of atomic-scale iridium on orthorhombic-CoSe_(2)for high efficiency dual-functional alkaline hydrogen evolution and organic degradation

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Journal of Energy Chemistry 2024年第5期92卷 271-281页

作者： Jingjing Huang Chenglin Zhong Yanjie Xia Jia Liu Guizhen Li Chao Yang Jiahong Wang Qian Wang Zhenbao Zhang Feng Yan Jianghua Wu Yu Deng Zhenjiang Zhou Xingchen He Paul K.Chu woon-Ming Lau Xue-Feng Yu College of Chemistry and Chemical Engineering Linyi UniversityLinyi 276005ShandongChina Shenzhen Engineering Center for the Fabrication of Two-Dimensional Atomic Crystals Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058ZhejiangChina Department of Physics Department of Materials Science and EngineeringDepartment of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina

The earth-abundant and high-performance catalysts are crucial for commercial implementation of hydrogen evolution reaction(HER).Herein,a multifunctional site strategy to construct excellent HER catalysts by incorporating iridium(Ir)ions on the atomic scale into orthorhombic-CoSe2(Ir-CoSe_(2))was *** hydrogen evolution activity in alkaline media such as a low overpotential of 48.7 mV at a current density of 10 mA cm^(-2)and better performance than commercial Pt/C catalysts at high current densities were found in the Ir-CoSe_(2) *** the experiments and theoretical calculations,it was revealed that Ir enabled CoSe_(2)to form multifunctional sites to synergistically catalyze alkaline HER by promoting the adsorption and dissociation of H_(2)O(Ir sites)and optimizing the binding energy for H^(*)on Co *** was noticeable that the electrolytic system comprising the Ir-CoSe_(2)electrode not only produced hydrogen efficiently via HER,but also degraded organic pollutants(Methylene blue).The cell voltage of the dual-function electrolytic system was 1.58 V at the benchmark current density of 50 mA cm^(-2),which was significantly lower than the conventional water splitting *** was indicated that this method was a novel strategy for designing advanced HER electrocatalysts by constructing multifunctional catalytic sites for hydrogen production and organic degradation.

关键词： Orthorhombic-CoSe_(2) Multifunctional sites design Hydrogen evolution reaction Synergistically catalyze Methylene blue oxidation

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Complicated calcified alloplastic implants in the nasal dorsum:A clinical analysis

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World Journal of Clinical Cases 2024年第18期12卷 3351-3359页

作者： Yong-Seon Hwang Taek-Kyun Kim Dong-Jun Yang Si-Hyong Jang Da-woon Lee Department of Plastic and Reconstructive Surgery College of MedicineSoonchunhyang UniversityCheonan-Si 31151South Korea Department of Plastic Surgery The PLUS Plastic Surgery ClinicSeoul 06035South Korea Department of Plastic Surgery CDU Plastic Surgery ClinicSeoul 06067South Korea Department of Pathology College of MedicineSoonchunhyang UniversityCheonan 31151Chungcheongnam-doSouth Korea

BACKGROUND In rhinoplasty,calcification around silicone implants is frequently observed in the tip dorsum(TD)***,based on a review of various literature,it is presumed that calcification in silicone implants occurs due to both inflammatory chemical reactions and physical friction against the *** calcification of nasal silicone implants not only results in the functional loss of the implants,but also leads to material ***,there is a lack of research on calcification of nasal silicone implants in the current *** To elucidate various clinical characteristics of calcification around nasal silicone implants,using histological and radiological *** This study analyzed data from 16 patients of calcified nasal implants,who underwent revision rhinoplasty for various reasons after undergoing augmentation rhinoplasty with silicone *** collected data included information on implant duration,implant types,location of calcification,presence of inflammatory reactions,and computed tomography(CT)*** The most common location of calcification,as visually analyzed,was in the TD area,accounting for 56%.Additionally,the analysis of CT scans revealed a trend of increasing Hounsfield Unit values for calcification with the duration of implantation,although this trend was not statistically significant(P=0.139).CONCLUSION Our study shows that reducing the frequency of calcification may be achievable by using softer silicone implants and by minimizing the damage to perioperative tissues.

关键词： Silicone implants Rhinoplasty Calcification Complication Hounsfield unit

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老年终末期肾病血液透析患者接受药物洗脱支架置入治疗的临床特点和预后分析

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中华老年心脑血管病杂志 2024年第5期26卷 485-489页

作者：冯园园刘行张雪刘彤 Seung-woon Rha 陈康寅天津医科大学第二医院心脏内科 300211 韩国高丽大学附属九老医院心脏中心

目的评估终末期肾病(ESRD)血液透析对老年患者接受药物洗脱支架(DES)置入治疗预后的影响。方法回顾性连续选取2003年3月至2021年7月于韩国高丽大学附属九老医院行DES治疗的年龄>60岁的患者4219例,将估算肾小球滤过率≥15ml/(min·1.73m^... 详细信息

目的评估终末期肾病(ESRD)血液透析对老年患者接受药物洗脱支架(DES)置入治疗预后的影响。方法回顾性连续选取2003年3月至2021年7月于韩国高丽大学附属九老医院行DES治疗的年龄>60岁的患者4219例,将估算肾小球滤过率≥15ml/(min·1.73m^(2))且未接受透析治疗的4102例作为老年非ESRD组,接受透析治疗的117例作为老年ESRD组,依据2组患者基线资料建立倾向性评分匹配(PSM)模型,PSM后老年非ESRD组183例,老年ESRD组99例。随访1年、3年、5年,记录主要不良心血管事件(MACE)等临床终点事件,绘制Kaplan-Meier生存曲线,用PSM和多因素Cox回归验证临床终点事件。结果PSM前老年ESRD组合并高血压、糖尿病、外周血管疾病、其他诊断比例高于老年非ESRD组(P<0.01)。Cox单因素回归分析显示,老年ESRD是行DES置入患者术后1年、3年、5年发生全因死亡的危险因素(P<0.05,P<0.01);老年ESRD是行DES置入患者术后3年、5年发生MACE的危险因素(HR=2.67,95%CI:1.73~4.10,P=0.000;HR=2.65,95%CI:1.79~3.90,P=0.000);老年ESRD是行DES置入患者术后5年发生TVR、TLR、NTVR和血运重建的危险因素(P<0.05,P<0.01)。Kaplan-Meier生存曲线显示,老年ESRD组无MACE生存率降低(80.0%vs 90.2%,Plog rank=0.006)。结论ESRD显著增加老年DES置入患者术后长期MACE的风险。

关键词：肾病连续性肾替代疗法药物洗脱支架预后预测主要不良心血管事件

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