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Quantile Regression of Latent Longitudinal Trajectory Features [article]

Huijuan Ma, Limin Peng, Haoda Fu
2018 arXiv   pre-print
Ma 1 , Limin Peng 1 and Haoda Fu 2 1 Department of Biostatistics and Bioinformatics, Emory University 2 Eli Lilly and Company Table S1 : S1 Summary statistics for the DURABLE data Category by  ...  coefficient estimates (black long-dashed line) and 95% pointwise confidence intervals (black dashed line) Supplementary Materials of "Quantile Regression of Latent Longitudinal Trajectory Features" Huijuan  ... 
arXiv:1806.06799v1 fatcat:2avxqky6jjhb7kezuxbzkwxuta

Microwave excited optical transparency enhancement resonances in Hanle-EIT conf iguration

Yisheng Ma Yisheng Ma, Jianliao Deng Jianliao Deng, Zhengfeng Hu Zhengfeng Hu, Huijuan He Huijuan He, Yuzhu Wang Yuzhu Wang
2013 Chinese Optics Letters (COL)  
We report an experimental observation of the optical transparency enhancement resonances in Hanleelectromagnetically induced transparency (EIT) configuration with a microwave field excitation. In this experimental system, a strong control field and a weak probe field form three-level Λ-type configurations of EIT. The fourth level is coupled by an additional microwave field. With the microwave field excitation, the probe field undergoes a process of absorption to transparency when the probe
more » ... decreases. Compared with the EIT effect, this result indicates optical transparency enhancement. A simple theoretical model and a numerical simulation are presented to explain the observed experimental results. The applications of these optical features are also discussed.
doi:10.3788/col201311.022701 fatcat:xznujcntlnayjm55j6zeojqvxy

Quantile Regression Modeling of Recurrent Event Risk [article]

Huijuan Ma, Limin Peng, Chiung-Yu Huang, Haoda Fu
2018 arXiv   pre-print
Progression of chronic disease is often manifested by repeated occurrences of disease-related events over time. Delineating the heterogeneity in the risk of such recurrent events can provide valuable scientific insight for guiding customized disease management. In this paper, we present a new modeling framework for recurrent event data, which renders a flexible and robust characterization of individual multiplicative risk of recurrent event through quantile regression that accommodates both
more » ... rved covariates and unobservable frailty. The proposed modeling requires no distributional specification of the unobservable frailty, while permitting the exploration of dynamic covariate effects. We develop estimation and inference procedures for the proposed model through a novel adaptation of the principle of conditional score. The asymptotic properties of the proposed estimator, including the uniform consistency and weak convergence, are established. Extensive simulation studies demonstrate satisfactory finite-sample performance of the proposed method. We illustrate the practical utility of the new method via an application to a diabetes clinical trial that explores the risk patterns of hypoglycemia in Type 2 diabetes patients.
arXiv:1811.06211v1 fatcat:eo3argex4jbjndteotldxvu5my

Folding of Tubular Waterbomb

Jiayao Ma, Huijuan Feng, Yan Chen, Degao Hou, Zhong You
2020 Research  
Origami has recently emerged as a promising building block of mechanical metamaterials because it offers a purely geometric design approach independent of scale and constituent material. The folding mechanics of origami-inspired metamaterials, i.e., whether the deformation involves only rotation of crease lines (rigid origami) or both crease rotation and facet distortion (nonrigid origami), is critical for fine-tuning their mechanical properties yet very difficult to determine for origami
more » ... ns with complex behaviors. Here, we characterize the folding of tubular waterbomb using a combined kinematic and structural analysis. We for the first time uncover that a waterbomb tube can undergo a mixed mode involving both rigid origami motion and nonrigid structural deformation, and the transition between them can lead to a substantial change in the stiffness. Furthermore, we derive theoretically the range of geometric parameters for the transition to occur, which paves the road to program the mechanical properties of the waterbomb pattern. We expect that such analysis and design approach will be applicable to more general origami patterns to create innovative programmable metamaterials, serving for a wide range of applications including aerospace systems, soft robotics, morphing structures, and medical devices.
doi:10.34133/2020/1735081 pmid:32529187 pmcid:PMC7171592 fatcat:hqq4rc3jgze3hnlic6heuutbnm

Softening Characterization of 300M High-Strength Steel during Post-Dynamic Recrystallization

Rong Zeng, Liang Huang, Hongliang Su, Huijuan Ma, Yangfei Ma, Jianjun Li
2018 Metals  
This paper investigates softening phenomena within the post-dynamic recrystallization (PDRX) process in 300M high-strength steel specimens with different initial dynamically recrystallized volume fractions. Isothermal, interrupted compression experiments were performed on a Gleeble-3500 at a temperature of 1273 K and strain rate of 0.01 s −1 . To acquire different initial volume fractions of dynamically recrystallized (DRX) grains, deformation was interrupted at two strain levels and
more » ... followed by isothermal annealing treatments. The softening behaviors respectively caused by the static recrystallization (SRX) and metadynamic recrystallization (MDRX) were qualitatively characterized by variations in the mechanical properties of the deformed and recrystallized grains. On the basis of the Taylor dislocation model, the evolution of geometric necessary dislocations (GNDs) and statistically stored dislocations (SSDs) densities were also discussed to qualitatively clarify the nature of different softening behaviors. Results indicate that the SRX occurred alone in samples without initial DRX grains, after an incubation time of approximately 50 s, while MDRX initially appeared within 1 s and completed at about 8 s in samples with a high initial volume fraction of DRX grains. The microhardness, indentation hardness, and Young's modulus in the deformed and recrystallized grains decreased gradually with an increase of MDRX and SRX volume fractions. The sink-in and pile-up phenomena were enhanced by the SRX and MDRX softening processes, respectively. The SSDs density decreased more noticeably during the MDRX process than that during the SRX, which indicates that the MDRX process contributed to a more significant softening effect within the microstructural evolution regimes.
doi:10.3390/met8050340 fatcat:anvu2tn7xbdhpejeipqcskaldy

Finite-Time Lyapunov Functions and Impulsive Control Design

Huijuan Li, Qingxia Ma, Yongjian Liu
2020 Complexity  
In this paper, we introduce finite-time Lyapunov functions for impulsive systems. The relaxed sufficient conditions for asymptotic stability of an equilibrium of an impulsive system are given via finite-time Lyapunov functions. A converse finite-time Lyapunov theorem for controlling the impulsive system is proposed. Three examples are presented to show how to analyze the stability of an equilibrium of the considered impulsive system via finite-time Lyapunov functions. Furthermore, according to
more » ... he results, we design an impulsive controller for a chaotic system modified from the Lorenz system.
doi:10.1155/2020/5179752 fatcat:6pir6pp4qjfs5owjtv6g26koh4

Rigid Folding of Generalized Waterbomb Origami Tubes

FENG Huijuan, MA Jiayao, CHEN Yan
2020 Journal of Mechanical Engineering  
1. 天津大学机构理论与装备设计教育部重点实验室 天津 300350; 2. 天津大学机械工程学院 天津 300350) 摘要:对折叠模式的精确描述是折纸结构工程应用的前提,但现有的理论和方法无法全面地分析大多数折纸结构的刚性折叠 过程。以广义 Waterbomb 折纸管为研究对象,基于球面机构运动学理论系统地分析了其折叠行为与运动协调条件,推导了折 叠管刚性收缩和扭转运动的两套解析运动学方程。研究了各种几何设计参数对 Waterbomb 折纸管刚性折叠行为的影响,并讨 论了该折纸结构折叠过程中的分岔行为与可能的物理干涉,及其引起的刚性折叠与结构形变的转化。此工作为基于广义 Waterbomb 折纸管的可编程超材料、可变形结构和机器人的设计与控制奠定了理论基础和设计依据,同时为复杂折纸结构的 运动学分析提供了有效的手段。 关键词:广义 Waterbomb 折纸管;刚性折纸;机构运动学;机构分岔 中图分类号:TH112 Abstract:The accurate theoretical description of the folding motion of origami
more » ... ures is the foundation for their design and precise control in engineering applications. However, the folding behavior of most general origami structures is very difficult to analyze because of the lack of theoretical model and analysis methodology for the complex mobile assemblies of spherical linkages. This paper focuses on the widely-used Waterbomb origami tubes. Based on the kinematics and compatibility of spherical linkages, the rigid folding behavior of generalized Waterbomb tubes was systematically analyzed with analytical kinematics equations to describe their rigid contract and twist motion. The effect of various geometrical parameters on the rigid folding behaviour, bifurcation property as well as physical blockages of the Waterbomb origami tube was studied. This work lays a theoretical foundation for the design and control of programmable metamaterials, deformable structures, and robots based on Waterbomb origami tubes, while such kinematic model can be readily applied to other origami patterns. Key words:Waterbomb origami tube;rigid folding;kinematics;bifurcation 月 2020 年 10 月 冯慧娟等:广义 Waterbomb 折纸管的刚性折叠运动特性 145 球面机构 [6-8] ,且多个单顶点组成的折纸纹路可视为 多个球面机构构成的网格 [35-36] 。因此,Waterbomb 折纸管中的三个典型顶点 A i, B i 和 C i 可以看作是三 种球面六杆机构,如图 2 所示,各顶点处相邻面板 间的折叠二面角分别为 , ij
doi:10.3901/jme.2020.19.143 fatcat:nmjpcsz2hrd3rkoxbekqakhg4e

High contrast transparent ramsey fringes using microwave pulses interaction with atomic coherent state in warm rubidium vapor

Yisheng Ma Yisheng Ma, Jianliao Deng Jianliao Deng, Zhengfeng Hu Zhengfeng Hu, Huijuan He Huijuan He, Yuzhu Wang Yuzhu Wang
2013 Chinese Optics Letters (COL)  
High contrast transparent Ramsey fringes are observed using double microwave pulses interaction with the prepared atomic coherent state in a warm 87 Rb vapor with mixture buffer gases in a closed cell. The Ramsey fringes are generated by the pulsed technique, a strong coupling light pulse and a weak signal light pulse are applied to prepare the atomic coherent state, followed by the application of double microwave pulses to interact with the atomic coherent state. Afterwards, the light pulses
more » ... e applied again with weaker intensity and detecting the signal transmission is delected. The central line of the transparent Ramsey fringes has narrow linewidth of 125 Hz and high contrast of 21%. The light shift is dramatically reduced since the interrogating process is not involved the light field, and the cavity pulling effect is negligible due to the low Q requirement, which is promising for building small, compact, and stable atomic clocks.
doi:10.3788/col201311.032701 fatcat:ftu4uhbyevckhhqbjmq47ntgge

THCluster: herb supplements categorization for precision traditional Chinese medicine [article]

Chunyang Ruan, Ye Wang, Yanchun Zhang, Jiangang Ma, Huijuan Chen, Uwe Aickelin, Shanfeng Zhu, Ting Zhang
2020 arXiv   pre-print
There has been a continuing demand for traditional and complementary medicine worldwide. A fundamental and important topic in Traditional Chinese Medicine (TCM) is to optimize the prescription and to detect herb regularities from TCM data. In this paper, we propose a novel clustering model to solve this general problem of herb categorization, a pivotal task of prescription optimization and herb regularities. The model utilizes Random Walks method, Bayesian rules and Expectation Maximization(EM)
more » ... models to complete a clustering analysis effectively on a heterogeneous information network. We performed extensive experiments on the real-world datasets and compared our method with other algorithms and experts. Experimental results have demonstrated the effectiveness of the proposed model for discovering useful categorization of herbs and its potential clinical manifestations.
arXiv:2011.11396v1 fatcat:zofrofod35dy7n5th2cnyk7qt4

On Representing Aesthetic Values of Literary Work in Literary Translation

Huijuan Ma
2009 Meta : Journal des traducteurs  
Montréal. Il a pour mission la promotion et la valorisation de la recherche. Érudit offre des services d'édition numérique de documents scientifiques depuis 1998. Note : les règles d'écriture des références bibliographiques peuvent varier selon les différents domaines du savoir. Ce document est protégé par la loi sur le droit d'auteur. L'utilisation des services d'Érudit (y compris la reproduction) est assujettie à sa politique d'utilisation que vous pouvez consulter à l'URI
more » ... Document téléchargé le 12 février 2017 10:23 RÉSUMÉ La beauté de la traduction littéraire est déterminée par la nature artistique du texte original. Ainsi, la représentation des valeurs esthétiques du texte original doit être considérée comme l'objectif ultime de la traduction littéraire. Le présent article se fonde, sur le plan théorique, sur les éléments esthétiques formels et non formels de la littérature classifiés par le traductologue chinois Liu Miqing ainsi que par la philologie chinoise traditionnelle et la stylistique littéraire moderne. Il explore en détail les méthodes de représentation des valeurs esthétiques littéraires sous deux angles, soit les marques esthétiques formelles et les marques esthétiques non formelles. Il révèle que, puisque dans une oeuvre littéraire les marques formelles et non formelles sont vraiment inséparables, une combinaison adéquate de celles-ci peut produire une solution satisfaisante. ABSTRACT The beauty of literary translation is determined by the artistic nature of the original work. Therefore, how to represent its aesthetic values should be considered the ultimate objective of literary translation. This paper, which is theoretically based on formal and nonformal aesthetic constituents of literature classified by the Chinese translation theorist Liu Miqing as well as traditional Chinese philology and modern literature stylistics, discusses extensively how to succeed in representing aesthetic values of literary works from two aspects, i.e., formal aesthetic markers and non-formal aesthetic markers. It also points out that since in a literary work formal markers and non-formal markers are really inseparable, the proper combination of the two can provide a satisfactory solution.
doi:10.7202/038897ar fatcat:akx7opfmwjerfbngdcmoifjg2e

Impact of Diabetic Ketoacidosis on Thyroid Function in Patients with Diabetes Mellitus

Yuling Xing, Jinhu Chen, Guangyao Song, Liying Zhao, Huijuan Ma, Ma gorzata Kotula Balak
2021 International Journal of Endocrinology  
Background. Changes in thyroid function in diabetes patients who developed diabetic ketoacidosis (DKA) still need to be fully elucidated. The aim of this study was to systematically review available data on the relationship between thyroid function and DKA in diabetes patients who developed DKA. Methods. Electronic databases (PubMed, EMBASE, Cochrane Library, and China Academic Journal Full-text Database (CNKI)) were searched systematically to search relevant literature before December 2020.
more » ... mean ± standard deviation and 95% confidence interval (95% CI) were used for evaluation, and sensitivity analysis was performed. Publication bias was estimated by funnel plot, Egger's test, and Begger's test. Results. 29 studies were included in the meta-analysis, and the indicators (T4, T3, FT3, FT4, TSH, T3RU, and rT3) of patients with DKA were compared and analyzed. The results of this study showed that the levels of T4, T3, FT3, FT4, and TSH were decreased and the level of rT3 was increased in patients with DKA. Compared with after treatment, the levels of T4, T3, FT3, and FT4 in patients with DKA were decreased before treatment, while the levels of rT3 were increased, and there was no significant difference in changes of TSH. With the aggravation of DKA, the levels of T4, T3, FT3, and FT4 will further decrease, while the changes of TSH have no statistical difference. Conclusion. Thyroid function changed in diabetic patients with DKA. It changed with the severity of DKA. This condition may be transient, preceding further recovery of DKA.
doi:10.1155/2021/2421091 pmid:34188679 pmcid:PMC8192218 fatcat:2yobdlqwojdt5iundhpihziws4

Rigid Foldability and Mountain-Valley Crease Assignments of Square-Twist Origami Pattern [article]

Huijuan Feng, Rui Peng, Shixi Zang, Jiayao Ma, Yan Chen
2020 arXiv   pre-print
Rigid foldability allows an origami pattern to fold about crease lines without twisting or stretching component panels. It enables folding of rigid materials, facilitating the design of foldable structures. Recent study shows that rigid foldability is affected by the mountain-valley crease (M-V) assignment of an origami pattern. In this paper, we investigate the rigid foldability of the square-twist origami pattern with diverse M-V assignments by a kinematic method based on the motion
more » ... on path. Four types of square-twist origami patterns are analyzed, among which two are found rigidly foldable, while the other two are not. The explicit kinematic equations of the rigid cases are derived based on the kinematic equivalence between the rigid origami pattern and the closed-loop network of spherical 4R linkages. We also propose a crease-addition method to convert the rigid foldability of the non-rigid patterns. The motion compatibility conditions of the modified patterns are checked, which verify the rigid foldability of the modified patterns. The kinematic analysis reveals the bifurcation behaviour of the modified patterns. This work not only helps to deepen our understanding on the rigid foldability of origami patterns and its relationship with the M-V assignments, but also provides us an effective way to create more rigidly foldable origami patterns from non rigid ones.
arXiv:2003.12921v1 fatcat:kcele27b2ngqha7pfzjzfk5jsm

Globally Adaptive Longitudinal Quantile Regression With High Dimensional Compositional Covariates

Huijuan Ma, Qi Zheng, Zhumin Zhang, Huichuan Lai, Limin Peng
2023 Statistica sinica  
The modeling strategy of quantile regression has been incorporated to the analysis longitudinal data under various perspectives (Koenker, 2004; Wang and Fygenson, 2009; Ma, Peng, and Fu, Ma et al., for  ... 
doi:10.5705/ss.202021.0006 fatcat:odqszjcccbel3obv2756phdcou

Bile acids, obesity, and the metabolic syndrome

Huijuan Ma, Mary Elizabeth Patti
2014 Baillière's Best Practice & Research : Clinical Gastroenterology  
Bile acids are increasingly recognized as key regulators of systemic metabolism. While bile acids have long been known to play important and direct roles in nutrient absorption, bile acids also serve as signalling molecules. Bile acid interactions with the nuclear hormone receptor farnesoid X receptor (FXR) and the membrane receptor G-protein-coupled bile acid receptor 5 (TGR5) can regulate incretin hormone and fibroblast growth factor 19 (FGF19) secretion, cholesterol metabolism, and systemic
more » ... nergy expenditure. Bile acid levels and distribution are altered in type 2 diabetes and increased following bariatric procedures, in parallel with reduced body weight and improved insulin sensitivity and glycaemic control. Thus, modulation of bile acid levels and signalling, using bile acid binding resins, TGR5 agonists, and FXR agonists, may serve as a potent therapeutic approach for the treatment of obesity, type 2 diabetes, and other components of the metabolic syndrome in humans.
doi:10.1016/j.bpg.2014.07.004 pmid:25194176 pmcid:PMC4159616 fatcat:kacx2zq2rfgknbarszqmpirmve

MicroRNA‑802 increases hepatic oxidative stress and induces insulin resistance in high‑fat fed mice

Xi Yang, Hanying Xing, Jingzhen Liu, Linquan Yang, Huan Ma, Huijuan Ma
2019 Molecular Medicine Reports  
., Waltham, MA, USA) at -20˚C.  ...  Solarbio Science and Technology, co., ltd., Beijing, china). lysates of 1,015 µg protein were separated by 10% SDSPAGE gel, transferred onto polyvinylidene difluoride membranes (EMD Millipore, Billerica, MA  ... 
doi:10.3892/mmr.2019.10347 pmid:31173239 pmcid:PMC6625421 fatcat:injz5ixjdjdi7myij5yu55uj5y
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