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Enhanced prediction of anisotropic deformation behavior using machine learning with data augmentation

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Journal of Magnesium and Alloys 2024年第1期12卷 186-196页

作者： Sujeong byun Jinyeong Yu Seho Cheon Seong ho Lee Sung Hyuk Park Taekyung Lee School of Mechanical Engineering Pusan National UniversityBusan 46241South Korea School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566South Korea

Mg alloys possess an inherent plastic anisotropy owing to the selective activation of deformation mechanisms depending on the loading *** characteristic results in a diverse range of flow curves that vary with a deformation *** study proposes a novel approach for accurately predicting an anisotropic deformation behavior of wrought Mg alloys using machine learning(ML)with data *** developed model combines four key strategies from data science:learning the entire flow curves,generative adversarial networks(GAN),algorithm-driven hyperparameter tuning,and gated recurrent unit(GRU)*** proposed model,namely GAN-aided GRU,was extensively evaluated for various predictive scenarios,such as interpolation,extrapolation,and a limited dataset *** model exhibited significant predictability and improved generalizability for estimating the anisotropic compressive behavior of ZK60 Mg alloys under 11 annealing conditions and for three loading *** GAN-aided GRU results were superior to those of previous ML models and constitutive *** superior performance was attributed to hyperparameter optimization,GAN-based data augmentation,and the inherent predictivity of the GRU for *** a first attempt to employ ML techniques other than artificial neural networks,this study proposes a novel perspective on predicting the anisotropic deformation behaviors of wrought Mg alloys.

关键词： Plastic anisotropy Compression Annealing Machine learning Data augmentation

Apolipoprotein A-I binding protein-mediated neuroprotection in glaucomatous neuroinflammation and neurodegeneration

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Neural Regeneration Research 2025年第5期20卷 1414-1415页

作者： Sinwoo Hwang Seunghwan Choi Soo-ho Choi Keun-Young Kim Yury I.Miller Won-Kyu Ju Hamilton Glaucoma Center and Shiley Eye Institute The Viterbi Family Department of OphthalmologyUniversity of California San DiegoLa JollaCAUSA Department of Medicine University of California San DiegoLa JollaCAUSA National Center for Microscopy and Imaging Research Department of NeurosciencesUniversity of California San DiegoLa JollaCAUSA

Glaucoma is a multifactorial eye disorder that can cause vision loss and irreversible blindness,affecting individ uals aged 40 to 80 yea rs *** to the aging population,it is expected that the number of people affected by glaucoma will surpass 111 million by 2040 as the disease becomes more *** primarily contributes to optic nerve axon loss and the progressive degeneration of retinal ganglion cells (RGCs),subsequently leading to vision impairment.

关键词： irreversible pass primarily

Gastric metastasis from primary lung adenocarcinoma mimicking primary gastric cancer

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World Journal of Gastrointestinal Oncology 2015年第3期7卷 12-16页

作者： Min Ji Kim Ji Hyung hong Eun Su Park Jae ho byun Department of Internal Medicine Incheon St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea Division of Medical Oncology Department of Internal MedicineIncheon St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea Department of hospital Pathology Incheon St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea

Gastric metastases from lung adenocarcinoma are rare. Because gastric metastasis grossly resembles advanced gastric cancer, it is difficult to diagnose gastric metastasis especially when the histology of the primary lung cancer is adenocarcinoma. We describe a case of gastric metastasis from primary lung adenocarcinoma mimicking Borrmann type Ⅳ primary gastric cancer. A 68-year-old man with known lung adenocarcinoma with multiple bone metastases had been experiencing progressive epigastric pain and dyspepsia over one year. Esophagogastroduodenoscopy revealed linitis plasticalike lesions in the fundus of the stomach. Pathologic examination revealed a moderately differentiated adenocarcinoma with submucosal infiltration. Positive immunohistochemical staining for thyroid transcription factor-1(TTF-1) and napsin A(Nap-A) confirmed that the metastasis was pulmonary in origin. The patient had been treated with palliative chemotherapy for the lung cancer and had lived for over fifteen months after the diagnosis of gastric metastasis. Clinicians should be aware of the possibility of gastric metastasis in patients with primary lung adenocarcinoma, and additional immunohistochemical staining for Nap-A as well as TTF-1 may help in differentiating its origin.

关键词： Adenocarcinoma of lung Napsin-A Thyroidtranscription factor-1 Gastric metastasis

Two-Dimensional Aerodynamic Models of Insect Flight for Robotic Flapping Wing Mechanisms of Maximum Efficiency

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Journal of Bionic Engineering 2008年第1期5卷 1-11页

作者： Thien-Tong Nguyen Doyoung byun Department of Aeronautical Engineering Hochiminh City University of Technology Hochiminh City Vietnam Department of Aerospace Engineering Konkuk University Seoul 143-701 Korea

In the ＂modified quasi-steady＂ approach, two-dimensional （2D） aerodynamic models of flapping wing motions are analyzed with focus on different types of wing rotation and different positions of rotation axis to explain the force peak at the end of each half stroke. In this model, an additional velocity of the mid chord position due to rotation is superimposed on the translational relative velocity of air with respect to the wing. This modification produces augmented forces around the end of each stroke. For each case of the flapping wing motions with various combination of controlled translational and rotational velocities of the wing along inclined stroke planes with thin figure-of-eight trajectory, discussions focus on lift-drag evolution during one stroke cycle and efficiency of types of wing rotation. This ＂modified quasi-steady＂ approach provides a systematic analysis of various parameters and their effects on efficiency of flapping wing mechanism. Flapping mechanism with delayed rotation around quarter-chord axis is an efficient one and can be made simple by a passive rotation mechanism so that it can be useful for robotic application.

关键词： bionics modified quasi-steady approach insect flight hovering forward flight

Comparative study on discharge conditions in micro-hole electrical discharge machining of tungsten carbide (WC-Co) material

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中国有色金属学会会刊：英文版 2009年第B09期19卷 114-118页

作者： Hyun-Seok TAK Chang-Seung HA Dong-Hyun KIM ho-Jun LEE Hae-june LEE Myung-Chang KANG National Core Research Center for Hybrid Materials Solution Pusan National University Department of Electrical Engineering Pusan National University

WC-Co is used widely in die and mold industries due to its unique combination of hardness, strength and wear-resistance. For machining difficult-to-cut materials, such as tungsten carbide, micro-electrical discharge machining(EDM) is one of the most effective methods for making holes because the hardness is not a dominant parameter in EDM. This paper describes the characteristics of the discharge conditions for micro-hole EDM of tungsten carbide with a WC grain size of 0.5 μm and Co content of 12%. The EDM process was conducted by varying the condenser and resistance values. A R-C discharge EDM device using arc erosion for micro-hole machining was suggested. Furthermore, the characteristics of the developed micro-EDM were analyzed in terms of the electro-optical observation using an oscilloscope and field emission scanning electron microscope.

关键词：电火花加工碳化钨钴难切削材料硬质合金放电扫描电子显微镜微孔模具行业

Influence of cutting parameters on surface characteristics of cut section in cutting of Inconel 718 sheet using CW Nd:YAG laser

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中国有色金属学会会刊：英文版 2009年第B09期19卷 32-39页

作者： Dong-Gyu AHN Kyung-Won byun Department of Mechanical Engineering Chosun University

Recently, laser cutting technologies begin to use for manufacturing mechanical parts of Inconel super-alloy sheet due to difficulties of machining of the Inconel material as a results of its extremely tough nature. The objective of this work is to investigate the influence of cutting parameters on surface characteristics of the cut section in the cutting of Inconel 718 super-alloy sheet using CW Nd:YAG laser through laser cutting experiments. Normal cutting experiments were performed using a laser cutting system with six-axis controlled automatic robot and auto-tracking system of the focal distance. From the results of the experiments, the effects of the cutting parameters on the surface roughness, the striation formation and the microstructure of the cut section were examined. In addition, an optimal cutting condition, at which the surface roughness is minimized and both the delayed cutting phenomenon and the micro-cracking are not initiated, is estimated to improve both the part quality and the cutting efficiency.

关键词：激光切割技术 Inconel YAG激光器表面特性 Nd 表面粗糙度分切自动跟踪系统

Stability of hypersurface sections of quadric threefolds

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Science China Mathematics 2015年第3期58卷 479-486页

作者： byun Sangho LEE YongNam Department of Mathematical Sciences

Let S be a complete intersection of a smooth quadric 3-fold Q and a hypersurface of degree d in *** analyze GIT stability of S with respect to the natural G=SO(5,C)-*** prove that if d 4 and S has at worst semi-log canonical singularities then S is ***,we prove that if d 3 and S has at worst semi-log canonical singularities then S is G-semistable.

关键词： quadric threefold hypersurface section stability geometric invariant theory

Optimized algorithm for balancing clusters in wireless sensor networks

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第10期10卷 1404-1412页

作者： Mucheol KIM Sunhong KIM Hyungjin byun School of Computer Science and Engineering Chung-Ang University 221Heuk seok-dongDongjak-guSeoul 156-756Korea

Wireless sensor networks consist of hundreds or thousands of sensor nodes that involve numerous restrictions in-cluding computation capability and battery *** control is an important issue for achieving a balanced placement of sensor *** clustering scheme is a widely known and efficient means of topology control for transmitting information to the base station in two *** automatic routing scheme of the self-organizing technique is another critical element of wireless sensor *** this paper we propose an optimal algorithm with cluster balance taken into consideration,and compare it with three well known and widely used approaches,i.e.,LEACH,MEER,and VAP-E,in performance *** results show that the proposed approach increases the overall network lifetime,indicating that the amount of energy required for com-munication to the base station will be reduced for locating an optimal cluster.

关键词： Wireless sensor networks Self-organizing sensor algorithm Clustering algorithm Optimization

Blockchain and Machine Learning for Intelligent Multiple Factor-Based Ride-Hailing Services

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Computers, Materials & Continua 2022年第3期70卷 4429-4446页

作者： Zeinab Shahbazi Yung-Cheol byun IIST Department of Computer EngineeringJeju National UniversityJeju-siJeju Special Self-Governing Province63243Kore

One of the common transportation systems in Korea is calling taxis through online applications,which is more convenient for passengers and drivers in the modern ***,the driver’s passenger taxi request can be rejected based on the driver’s location and ***,there is a need to specify driver’s acceptance and rejection of the received *** security of this systemis anothermain core to save the transaction information and safety of passengers and *** this study,the origin and destination of the Jeju island SouthKorea were captured from T-map and processed based on machine learning decision tree and XGBoost *** blockchain framework is implemented in the Hyperledger Fabric *** experimental results represent the features of *** cross-validation was *** is another factor for the taxi trip,which in total trip in midnight is quite *** process presents the successful matching of ride-hailing taxi services with the specialty of distance,the trip request,and safety based on the total city measurement.

关键词： Taxi trip blockchain machine learning ride-hailing prediction trip distance