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Anti-plane deformations around arbitrary-shaped canyons on a wedge-shape half-space:moment method solutions

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Earthquake Engineering and Engineering Vibration 2003年第2期2卷 281-287页

作者： Nazaret Dermendjian Vincent w.lee 梁建文 Department of Civil Engineering & Applied Mechanics California State UniversityNorthridgeCalifornia 91330-8347USA Assistant Professor Department of Civil& Environmental Engineering University of Southern CaliforniaLos AngelesCalifornia90089-2531USA Profcssor School of Civil Engineering Tianjin UniversityTianjin 300072China Professor

The wave propagation behavior in an elastic wedge-shaped medium with an arbitrary shaped cylindrical canyon at its vertex has been *** computation of the wave displacement field is carried out on and near the canyon surfaces using weighted-residuals(moment method).The wave displacement fields are computed by the residual method for the cases of elliptic,circular,rounded-rectangular and flat-elliptic canyons,The analysis demonstrates that the resulting surface displacement depends,as in similar previous analyses,on several factors including,but not limited,to the angle of the wedge,the geometry of the vertex,the frequencies of the incident waves,the angles of incidence,and the material properties of the *** analysis provides intriguing results that help to explain geophysical observations regarding the amplification of seismic energy as a function of site conditions.

关键词： weighted-residual moment method wedge half-space arbitrary-shaped cicular elliptic rectangular canyons

Diffraction of anti-plane SH waves by a semi-circular cylindrical hill with an inside concentric semi-circular tunnel

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Earthquake Engineering and Engineering Vibration 2004年第2期3卷 249-262页

作者： Vincent w.lee 罗昊梁建文 Dept.of Civil and Environmental Engineering Univ.of Southern CaliforniaLos AngelesCA 90089-2531USA Professor Civil Engineering and Architecture Experiment Center Dept.of Civil EngineeringShanghai Jiaotong Univ.800 Dongchuan Rd.Shanghai 200240China Dept.of Civil EngineeringTianjin Univ.Tianjin 300072China Assistant Engineer Dept.of Civil Engineering Tianjin Univ.Tianjin 300072China Professor

A closed-form analytic solution of two-dimensional scattering and diffraction of plane SH waves by a semi- cylindrical hill with a semi-cylindrical concentric tunnel inside an elastic half-space is presented using the cylindrical wave functions expansion *** solution is reduced to solving a set of infinite linear algebraic *** expansion theorem with the form of complex exponential function and cosine function is *** solutions are obtained by truncation of the infinite *** accuracy of the presented numerical results is carefully verified.

关键词： SH waves hill tunnels close-form analytic solution amplifications

Microstructure investigation and multicolor upconversion in Yb3+/Ln3+(Ln=Er/Tm/Ho) ions doped α-Sialon

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Progress in Natural Science:Materials International 2019年第5期29卷 549-555页

作者： Sang Hoon Jeong Yuwaraj K.Kshetri Seung Ho Kim Sung Hun Cho Soo w.lee Department of Environment and Bio-Chemical Engineering Sun Moon University Research Center for Eco Multi-Functional Nano Materials Sun Moon University The Institute of Scientific and Industrial Research (ISIR) Osaka University

Yb3+/Ln3+(Ln=Er/Tm/Ho)-α-sialon ceramics were fabricated by hot press sintering *** microstructure and luminescent properties were studied by XRD,EDS,HRTEM and photoluminescence *** results showed that the sintered ceramics consisted ofα-Sialon with a trace amount ofβ-Sialon *** frequency upconversion and downconversion properties of Yb3+/Ln3+(Ln=Er/Tm/Ho)-α-Sialon ceramics were investigated under 980 nm low-power *** different concentrations of Yb3+/Ln3+(Ln=Er/Tm/Ho)produced multicolor emissions characteristics of each Ln3+ion as a result of the energy transfer from Yb3+to Er3+,Tm3+and Ho3+*** EDS spectra measurements and mappings showed that the Ln3+ions were well incorporated in theα-Sialon *** evolution of the emission decay behavior has been investigated to understand the energy transfer mechanism.

关键词： α-Sialon Hot press sintering Upconversion Energy transfer

Development of a 3D subcutaneous construct containing insulin-producing beta cells using bioprinting

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Bio-Design and Manufacturing 2022年第2期5卷 265-276页

作者： Chi B.Ahn Ji-Hyun lee Joo H.Kim Tae H.Kim Hee-Sook Jun Kuk H.Son Jin w.lee Department of Molecular Medicine College of MedicineGachon University155Gaetbeol-roYeonsu-kuIncheonRepublic of Korea Department of Health Sciences and Technology GAIHSTGachon University155Gaetbeol-roYeonsu-kuIncheonRepublic of Korea College of Pharmacy Gachon University191Hambangmoe-roYeonsu-kuIncheonRepublic of Korea Department Thoracic and Cardiovascular Surgery Gachon University Gil Medical CenterCollege of MedicineGachon University21Namdong-daero 774 beon-gilNamdong-guIncheonRepublic of Korea

Type 1 diabetes is caused by insulin deficiency due to the loss of beta cells in the islets of *** severe cases,islet transplantation into the portal vein is ***,due to the loss of transplanted islets and the failure of islet function,the 5-year insulin independence rate of these patients iswe developed a long-term,insulin-secreting,3 Dbioprinted construct implanted subcutaneously with the aim of preventing islet *** bioprinted construct was fabricated by the multi-layer bioprinting of beta-cell(mouse insulinoma-6:MIN-6)-encapsulated alginate bioink and poly(caprolactone)biodegradable polymer.A glucose response assay revealed that the bioprinted constructs proliferated and released insulin normally during the 4-week in vitro *** MIN-6 generated clusters with a diameter of 100-200μm,similar to the original pancreatic islets in the *** an in vivo study using type 1 diabetes mice,animals implanted with bioprinted constructs showed three times higher insulin secretion and controlled glucose levels at 8 weeks after *** the implanted,bioprinted constructs had a positive effect on insulin secretion in the experimental animals,the survival rate of the implanted group(75%)was three times higher than that of the non-implanted group(25%).The results suggest that the proposed,3 D-bioprinted,subcutaneous construct can be a better alternative to portal vein islet transplantation.

关键词： 3D bioprinting Subcutaneous construct Type 1 diabetes Insulin Beta cells

Feature identification in complex fluid flows by convolutional neural networks

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Theoretical & Applied Mechanics Letters 2023年第6期13卷 447-454页

作者： Shizheng wen Michael w.lee Kai M.Kruger Bastos Ian K.Eldridge-Allegra Earl H.Dowell Department of Mathematics ETH ZurichZürich 8092Switzerland NASA Langley Research Center HamptonVA 23666USA Rivian San FranciscoCA 94080USA Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC 27708USA

Recent advancements have established machine learning's utility in predicting nonlinear fluid dynamics,with predictive accuracy being a central motivation for employing neural ***,the pattern recognition central to the networks function is equally valuable for enhancing our dynamical insight into the complex fluid *** this paper,a single-layer convolutional neural network(CNN)was trained to recognize three qualitatively different subsonic buffet flows(periodic,quasi-periodic and chaotic)over a high-incidence airfoil,and a near-perfect accuracy was obtained with only a small training *** convolutional kernels and corresponding feature maps,developed by the model with no temporal information provided,identified large-scale coherent structures in agreement with those known to be associated with buffet *** to hyperparameters including network architecture and convolutional kernel size was also *** coherent structures identified by these models enhance our dynamical understanding of subsonic buffet over high-incidence airfoils over a wide range of Reynolds numbers.

关键词： Subsonic buffet flows Feature identification Convolutional neural network Long-short term memory

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圆弧形沉积河谷场地在平面P波入射下的响应

岩土力学 2001年第2期22卷 138-143页

作者：梁建文严林隽李军伟 Vincent w.lee 天津大学土木工程系天津300072 University of Southern California Los Angeles

利用Fourier－Bessel级数展开法，在频域内给出了圆弧形沉积河谷场地在平面P波入射下动力响应的一个解析解，并分析了入射波波长、入射角度与河谷宽度、深度等因素对动力响应的影响。

关键词：圆弧形沉积河谷平面P波动力响应入射波波长河谷宽度地震波入射角度放大作用

任意圆弧形凸起地形中隧洞对入射平面SH波的影响

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地震学报 2004年第5期26卷 495-508页

作者：梁建文罗昊 Vincent w.lee 天津大学土木工程系 Department of Civil Engineering University of Southern California Los Angeles CA 90089-2531 U.S.A.

借助辅助函数的思想 ,采用波函数展开法给出了圆弧形凸起地形中隧洞对入射平面SH波影响问题的一个解析解 .数值结果表明 ,凸起地形中隧洞的存在以及隧洞大小 ,对凸起地形表面运动 ,以及凸起地形中的隧洞的动应力集中均具有显著影响 .

关键词：凸起地形隧洞散射 SH波解析解

Successful use of closed-loop allostatic neurotechnology for post-traumatic stress symptoms in military personnel： self-reported and autonomic improvements

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Military Medical Research 2018年第1期5卷 1-12页

作者： Catherine L.Tegeler lee Gerdes Hossam A.Shaltout Jared F.Cook Sean L.Simpson Sung w.lee Charles H.Tegeler Department of Neurology Wake Forest School of Medicine Medical Center Boulevard Winston-Salem NC 27157 USA Brain State Technologies LLC 15150 North Hayden Road Scottsdale AZ 85260USA Hypertension and Vascular Research Center Wake Forest School of Medicine Medical Center Boulevard Winston-Salem NC 27157USA Department of Biostatistical Sciences Wake Forest School of Medicine Medical Center Boulevard Winston-Salem NC 27157 USA

Background:Military-related post-traumatic stress(PTS)is associated with numerous symptom clusters and diminished autonomic cardiovascular ***,relational,resonance-based,electroencephalic mirroringis a noninvasive,closed-loop,allostatic,acoustic stimulation neurotechnology that produces realtime translation of dominant brain frequencies into audible tones of variable pitch and timing to support the autocalibration of neural *** report clinical,autonomic,and functional effects after the use offor symptoms of military-related ***:Eighteen service members or recent veterans(15 active-duty,3 veterans,most from special operations,1 female),with a mean age of 40.9(SD=6.9)years and symptoms of PTS lasting from 1 to 25 years,undertook19.5(SD=1.1)sessions over 12 *** for symptoms of PTS(Posttraumatic Stress Disorder Checklist–Military version,PCL-M),insomnia(Insomnia Severity Index,ISI),depression(Center for Epidemiologic Studies Depression Scale,CES-D),and anxiety(Generalized Anxiety Disorder 7-item scale,GAD-7)were collected before(Visit1,V1),immediately after(Visit2,V2),and at 1 month(Visit3,V3),3(Visit4,V4),and 6(Visit5,V5)months after intervention *** measures only taken at V1 and V2 included blood pressure and heart rate recordings to analyze heart rate variability(HRV)and baroreflex sensitivity(BRS),functional performance(reaction and grip strength)testing,blood and saliva for biomarkers of stress and inflammation,and blood for epigenetic *** t-tests,wilcoxon signed-rank tests,and a repeated-measures ANOVA were ***:Clinically relevant,significant reductions in all symptom scores were observed at V2,with durability through *** were significant improvements in multiple measures of HRV and BRS[Standard deviation of the normal beat to normal beat interval(SDNN),root mean square of the successive differences(rMSSD),high frequency(HF),low frequency(LF),and total power,HF alpha,

关键词： Neurotechnology Allostasis Autonomic Heart rate variability Baroreflex sensitivity Closed-loop Acoustic stimulation Military Post-traumatic stress disorder HIRREM

圆弧形层状沉积河谷场地在平面SH波入射下动力响应分析

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岩土工程学报 2000年第4期22卷 396-401页

作者：梁建文张郁山顾晓鲁 Vincent w.lee 天津大学建工学院土木系天津300072 美国南加州大学洛杉机900892531

利用Fourier Bessel级数展开法在频域内给出了圆弧形层状沉积河谷场地对平面SH波放大作用的一个解析解。

关键词：层状沉积河谷场地平面SH波动力响应分析