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AISI 4340钢马氏体相变的研究

东北大学学报（自然科学版） 2006年第6期27卷 650-653页

作者：赵洪壮 young-kook lee 刘相华王国栋东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110004 Department of Metallurgical Engineering Yonsei UniversitySeoul 120-749Korea.

采用膨胀法对AISI 4340钢在900～1150℃几种不同温度下进行奥氏体化,以得到不同的奥氏体晶粒度（AGS）,然后快速冷却到室温,得到马氏体组织.实验结果表明：奥氏体晶粒度和晶界析出相对马氏体相变动力学，尤其是马氏体转变温度（tms）产... 详细信息

采用膨胀法对AISI 4340钢在900～1150℃几种不同温度下进行奥氏体化,以得到不同的奥氏体晶粒度（AGS）,然后快速冷却到室温,得到马氏体组织.实验结果表明：奥氏体晶粒度和晶界析出相对马氏体相变动力学，尤其是马氏体转变温度（tms）产生很大影响。总的趋势是AGS越大,tms越高。在不同的奥氏体化温度段,会有不同的C，N化合物析出,对马氏体形核产生影响。在奥氏体化温度低于1000℃时，AGS增大,tms快速增加。其原因主要是由于AIN等晶界析出相对马氏体形核的促进作用。在奥氏体化温度高于1050℃时，tms随AGS增大而升高，这是因为TiC等溶解温度较高的化合物在晶界析出对马氏体形核起到促进作用。

关键词：奥氏体晶粒度马氏体相变动力学低合金钢

A Rapid Adaptation Approach for Dynamic Air‑Writing Recognition Using Wearable Wristbands with Self‑Supervised Contrastive Learning

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Nano-Micro Letters 2025年第2期17卷 417-431页

作者： Yunjian Guo Kunpeng Li Wei Yue Nam‑young Kim Yang Li Guozhen Shen Jong‑Chul lee Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897South Korea Radio Frequency Integrated Circuit(RFIC)Bio Centre Kwangwoon UniversitySeoul 01897South Korea Department of Electronic Engineering Kwangwoon UniversitySeoul 01897South Korea School of Microelectronics Shandong UniversityJinan 250101People’s Republic of China State Key Laboratory of Integrated Chips and Systems Fudan UniversityShanghai 200433People’s Republic of China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081People’s Republic of China

Wearable wristband systems leverage deep learning to revolutionize hand gesture recognition in daily *** existing approaches that often focus on static gestures and require extensive labeled data,the proposed wearable wristband with selfsupervised contrastive learning excels at dynamic motion tracking and adapts rapidly across multiple *** features a four-channel sensing array composed of an ionic hydrogel with hierarchical microcone structures and ultrathin flexible electrodes,resulting in high-sensitivity capacitance *** wireless transmission from a Wi-Fi module,the proposed algorithm learns latent features from the unlabeled signals of random wrist ***,only few-shot labeled data are sufficient for fine-tuning the model,enabling rapid adaptation to various *** system achieves a high accuracy of 94.9%in different scenarios,including the prediction of eight-direction commands,and air-writing of all numbers and *** proposed method facilitates smooth transitions between multiple tasks without the need for modifying the structure or undergoing extensive task-specific *** utility has been further extended to enhance human–machine interaction over digital platforms,such as game controls,calculators,and three-language login systems,offering users a natural and intuitive way of communication.

关键词： Wearable wristband Self-supervised contrastive learning Dynamic gesture Air-writing Human-machine interaction

An Internal State Variable Model for the Low Temperature Tempering of Low Alloy Steels

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Journal of Shanghai Jiaotong university(Science) 2000年第1期5卷 178-184页

作者： Mark T. Lusk, young-kook lee, Herng-Jeng Jou, William H. Elliott, Gerard M Ludtka 1.Materials Science Program, Division of Engineering, Colorado School of Mines, Golden, CO. U.S. 80401 2.Questek Innovations LCC, 1801 Maple Avenue, Evanston, IL, U.S. 602

An internal state variable (ISV) framework is used to predict the rate and degree of strain relaxation associated with the stage I, low temperature tempering of martensite. A single variable tracks the change in volume between the tempered an untempered structures. The rate at which this occurs is taken to be a function of martensite fraction, temperature, degree of tempering, and carbon concentration. Experimental dilatometty data is used to both fit and validate the model.

关键词： Tempering Model Quenching Phase Transformations

Pan-TRK positive uterine sarcoma in immunohistochemistry without neurotrophic tyrosine receptor kinase gene fusions:A case report

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World Journal of Clinical Cases 2025年第2期13卷 39-49页

作者： Seungmee lee Yu-Ra Jeon Changmin Shin Sun-young Kwon Sojin Shin Department of Obstetrics and Gynecology Keimyung University School of MedicineDaegu 42601South Korea Department of Pathology and Institute for Cancer Research Keimyung University School of MedicineDaegu 42601South Korea

BACKGROUND The classification of uterine sarcomas is based on distinctive morphological and immunophenotypic characteristics,increasingly supported by molecular genetic *** on neurotrophic tyrosine receptor kinase(NTRK)gene fusionpositive uterine sarcoma,potentially aggressive and morphologically similar to fibrosarcoma,are limited due to its recent ***-TRK immunohistochemistry(IHC)analysis serves as an effective screening tool with high sensitivity and specificity for NTRK-fusion *** SUMMARY We report a case of a malignant mesenchymal tumor originating from the uterine cervix,which was pan-TRK IHC-positive but lacked NTRK gene fusions,accompanied by a brief literature review.A 55-year-old woman presented to the emergency department with abdominal pain and distension,exhibiting significant ascites and multiple solid pelvic *** examination revealed a tumor encompassing the uterine cervix,extending to the vagina and uterine corpus.A punch biopsy of the cervix indicated NTRK sarcoma with positive immunochemical pan-TRK ***,subsequent next generation sequencing revealed no NTRK gene fusion,leading to a diagnosis of poorly differentiated,advanced-stage *** The clinical significance of NTRK gene fusion lies in potential treatment with TRK inhibitors for positive *** such rare tumors is crucial due to the potential applicability of tropomyosin receptor kinase inhibitor treatment.

关键词： Uterine sarcoma Cervical sarcoma Neurotrophic tyrosine receptor kinase gene fusion Next generation sequencing Case report

Electron beam deposition and characterization of thin film Ti-Ni for shape memory applications

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Rare Metals 2006年第z2期25卷 237-242页

作者： NOH Hae-Yong JEE Kwang-Koo lee Kyu-Hwan lee young-kook Department of Metallurgical System Yonsei University Seoul 120-749 KoreaAdvanced Materials Research Center Division of Materials Korea Institute of Science and Technology Cheongryang Seoul 130-650 Korea Advanced Materials Research Center Division of Materials Korea Institute of Science and Technology Cheongryang Seoul 130-650 Korea Department of Metallurgical System Yonsei University Seoul 120-749 Korea

Thin film of Ti-Ni alloy has a potential to perform the microactuation functions required in the microelectromechanical system (MEMS). It is essential, however, to have good uniformity in both chemical composition and thickness to realize its full potential as an active component of MEMS devices. Electron beam evaporation technique was employed in this study to fabricate the thin films of Ti-Ni alloy on different substrates. The targets used for the evaporation were first prepared by electron beam melting. The uniformity of composition and microstructure of the thin films were characterized by electron probe microanalysis (EPMA), Auger electron spectroscopy (AES), X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM). The mechanical property of the thin films was evaluated by the nano-indentation test. The martensitic transformation temperature was measured by differential scanning calorimetry (DSC). It is confirmed that the chemical composition of deposited thin films is identical to that of the target materials. Furthermore, results from depth profiling of the chemical composition variation reveal that the electron beam evaporation process yields better compositional homogeneity than other conventional methods such as sputtering and thermal evaporation. Microstructural observation by TEM shows that nanometer size precipitates are preferentially distributed along the grain boundaries of a few micron size grains. The hardness and elastic modulus of thin films decreases with an increase in Ti contents.

关键词： electron beam evaporation TiNi SMA thin film martensitic transformation reverse martensitic transformation

Optimal Center-of-Mass Pivot Effect of Spinal Motion in Feline Galloping

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Journal of Bionic Engineering 2020年第5期17卷 970-977页

作者： young kook Kim Dongwon Yun LV R&D team Electro-technology R&D CenterLS ELECTRIC Co.LtdCheongju 28437South Korea Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988South Korea

In this paper,we studied the acceleration behavior of a quadruped animal during a galloping *** the development of many quadruped robotic systems has been focused on dynamic movements,it is obvious that guidance from the dynamic behavior of quadruped animals is needed for robotics *** fulfill this demand,this paper deals with analysis of the galloping motions of a domestic cat,which is well known for its excellent acceleration performance among four-legged *** on the planar motion capture environment,the movement data of a galloping feline was acquired and the dynamic motions were estimated using a spring-mass *** particular,the effects of the position and angle of the center-of-mass of the cat,angular displacement of the spine,and angular velocity of the spine were analyzed and are discussed *** this process,it was possible to understand the dynamic movement characteristics of the cat,and to understand the relationships between,and the influences of,these *** this analysis,we provide significant data applicable to the design of joint movements in quadruped robot systems.

关键词： quadrupedalism feline galloping domestic cat center-of-mass

Biomimetic Quadruped Robot with a Spinal Joint and Optimal Spinal Motion via Reinforcement Learning

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Journal of Bionic Engineering 2021年第6期18卷 1280-1290页

作者： young kook Kim Woojin Seol Jihyuk Park LV R&D Team Electro-technology R&D CenterLS Electric Co.LtdCheongju28437Republic of Korea Digital Innovation Unit Korea Hydro&Nuclear Power Co.Ltd1312-gil YuseongdaeroYusung-guDaejeon34101Republic of Korea Department of Automotive Engineering College of Mechanical and IT EngineeringYeungnam University280 Daehak-roGyeongsanGyeongbuk38541Republic of Korea

Feline animals can run quickly using spinal joints as well as the joints that make up their four *** paper describes the development of a quadruped robot including a spinal joint that biomimics feline *** developed robot platform consists of four legs with a double 4-bar linkage type and one simplified rotary *** addition,Q-learning,a type of machine learning,was used to find the optimal motion profile of the spinal *** bounding gait was implemented on the robot system using the motion profile of the spinal joint,and it was confirmed that using the spinal joint can achieve a faster Center of Mass(CoM)forward speed than not using the spinal *** the motion profile obtained through Q-learning did not exactly match the spinal angle of a feline animal,which is more multiarticular than that of the developed robot,the tendency of the actual feline animal spinal motion profile,which is sinusoidal,was similar.

关键词： Quadruped robot system Bioinspired methods Legged robots Machine learning Q-learning

Preparation of TiAlN/ZrN and TiCrN/ZrN multilayers by RF magnetron sputtering

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中国有色金属学会会刊：英文版 2009年第4期19卷 795-799页

作者： Jong-kook lee G won-Seung YANG Department of Advanced Materials Engineering Chosun University BK21 Education Center of Mould Technology for Advanced Materials and Parts Chosun University

Titanium-based nitride coatings on cutting tools,press molds and dies can be used to prolong their life cycle because of their superior corrosion and oxidation ***/ZrN and TiCrN/ZrN multilayer coatings were prepared by RF magnetron sputtering,and their microstructural evolution and corrosion resistance during heat treatment were *** TiAlN/ZrN and TiCrN/ZrN multilayer coatings are degraded by heating up to 600 ℃ with the formation of oxides particles on the *** the heat treatment,the TiCrN/ZrN and TiAlN/ZrN multilayer coatings show the lowest corrosion current density and the highest polarization resistance at temperature range of 400-500 ℃.Consequently,the TiAlN/ZrN and TiCrN/ZrN multilayer coatings show good corrosion resistance at temperature range of 400-500 ℃ during heating.

关键词：射频磁控溅射溅射制备氮化锆多层膜钛铝耐腐蚀性腐蚀电流密度

The association between C-reactive protein to albumin ratio and 6-month neurological outcome in patients with in-hospital cardiac arrest

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World Journal of Emergency Medicine 2024年第3期15卷 223-228页

作者： Ji Ho lee Dong Hun lee Byung kook lee Seok Jin Ryu Department of Emergency Medicine Chonnam National University HospitalGwangju 61469Republic of Korea Department of Emergency Medicine Chonnam National University Medical SchoolGwangju 61469Republic of Korea

The global incidence rates of in-hospital cardiac arrest(IHCA)range from1.2 to 9.0 per1,000 hospitalized patients,as per the National Cardiac Arrest Database.[1] While IHCAs tend to exhibit superior 30-day survival rates relative to out-of-hospital cardiac arrests (OHCA) due to situational advantages,such as immediate access to medical personnel and treatments.

关键词： patients cardiac IHC