114 research outputs found
Essays on semiparametric cox proportional hazard models:
No full textIn this dissertation I study different versions of the semiparametric proportional hazard duration model and their practical applications under both frequentist and Bayesian econometrics frameworks. I use the unemployment spell data set that is created from the Panel Study of Income Dynamics (PSID).
In Chapter 1 I study the effects of unemployment compensation and other important sociodemographic factors on unemployment duration. Whether duration dependence follows a particular function form is also examined. Discrete, semiparametric, proportional hazard models are used and compared among different specifications. I allow for nonparametric estimation of the effect of time on the unemployment exit rate. Because unobserved individual heterogeneity has the potential to bias the estimation results, we also consider gamma heterogeneity as an additional source of error in the hazard model (i.e., the so called mixed proportional hazard model, MPH). I find that the nonparametric baseline hazard estimations capture very well the shape of the empirical duration, which often does not belong to a specific parametric family; and unemployment insurance and socio-demographic aspects have significant impacts on the unemployment spell.
In the second chapter I test whether different ways to resume work, such as new job and recall, have different duration behaviors. Hence a semiparametric dependent competing risks proportional hazard model is specified. Identifiability of such model is also discussed. By assuming linearity on the baseline hazard at each time interval, I allow for unrestricted correlation between the competing risks. My model guarantees that the unobserved failure occurs later than the observed failure at any possible time point, and censored observations are accommodated explicitly in the model specification. The estimated correlation coefficient suggests that recall duration and new job duration have a positive relationship that may not be negligible. We also find that there is significant difference in the hazard structure of returning to the same employer and a different employer.
Different from the first two chapters, in the third chapter I investigate the ordered probit duration model semiparametrically using the Bayesian Markov Chain Monte Carlo (MCMC) methods. I develop and estimate the model without considering unobserved heterogeneity, and noninformative priors are assumed for both the baseline hazard and regressor parameters. Hybrid Metropolis-Hastings/Gibbs sampler is employed to speed up chain mixture. Convergence of the chains is assessed by the Gelman-Rubin scale reduction factor. Applications on the PSID unemployment duration data demonstrate that the proposed model and estimation method perform well.Ph.D.Includes bibliographical references (p. 103-110)by Huiying Zhan
Dynamic remodeling and rapid manufacturing of functional materials by ring-opening metathesis polymerization
No full textRing-opening metathesis polymerization (ROMP) is a powerful and broadly applicable method to synthesize polymeric materials with unique architectures and useful functions. Remarkable progress has been made on the molecular design of catalysts and monomers that allows precise control over ROMP. The research presented in this dissertation investigates ROMP behavior of cyclic olefins with different ring nature in the bulk state, which is much less explored in the literature compared to solution ROMP. Structure-property relationships were constructed to advance fundamental understanding and provide guidance for further monomer design. Potential applications of these monomers in dynamic remodeling and rapid manufacturing were also demonstrated.
As ROMP is driven by the release of ring strain, a monomer-polymer equilibrium would be established for monomers with low ring strain energy. Chapter 2 investigates the reversibility of equilibrium ROMP and explores the feasibility of depolymerization in the bulk state upon a mild thermal stimulus. We conducted a systematic study on ceiling temperatures (Tc) of substituted cyclopentenes to quantitatively describe the polymerizability of the low-strain monomers both in solution and in the bulk state. This study also identified the important role of anchor group effect in Tc. With the establishment of tunable Tcs, Chapter 3 focuses on the development of thermally reversible networks for remodeling applications by employing multifunctional cyclopentenes. These neat monomers undergo ROMP at room temperature to afford mechanically robust, cross-linked polymers; at slightly elevated temperatures, the resulting polymers readily depolymerize to a free-flowing liquid. This polymerization-depolymerization process, characterized by thermal analysis and rheological tests, is triggered solely by temperature changes and is reversible for several cycles.
When cyclic olefins with large ring strain energy are polymerized, ROMP becomes irreversible and highly exothermic. The heat generated can be utilized as the energy source to trigger further polymerization; ultimately, a propagating reaction wave is produced to convert the available monomer to polymer. This process is termed as frontal ring-opening metathesis polymerization (FROMP) which has great potential in manufacturing large parts of thermosets and composites in a rapid and energy-efficient manner. Since only exo- and endo-dicyclopentadiene have been reported as FROMP monomers, Chapter 4 expands the scope of monomers and builds the structure-property relationship to guide functional materials design. We investigated 30 strained cyclic olefins and correlated FROMP reactivity with the thermodynamic, kinetic and physical properties of the monomer using linear regression analysis. Due to the complexity of FROMP, linear regression did not perform well for structurally disparate monomers. Thus, machine learning approaches were applied with structural parameters of the monomer as inputs and FROMP-related properties (heat released and frontal velocity) as outputs. Models by random forest algorithm with reasonable predictability were constructed, and important features that determine FROMP behavior were also identified. With the expansion of FROMP toolbox, Chapter 5 examines the copolymerization behavior in FROMP. An unexpected non-monotonic increase in frontal velocity was observed in copolymerization with di-norbornenyl cross-linkers, which is counterintuitive to the mixing rules. We believe that the degree of cross-linking is the main contributor to this unusual behavior, which is supported by a series of copolymerization experiments with mono-norbornenyl derivatives. The copolymerization study not only provides a strategy to systematically modify materials properties (such as interfacial shear strength and mechanical properties) but also strengthens further understanding of the FROMP process.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2021-05-01The student, Huiying Liu, accepted the attached license on 2019-04-14 at 21:11.The student, Huiying Liu, submitted this Dissertation for approval on 2019-04-15 at 07:57.This Dissertation was approved for publication on 2019-04-15 at 10:26.DSpace SAF Submission Ingestion Package generated from Vireo submission #13614 on 2019-08-22 at 15:06:17Made available in DSpace on 2019-08-23T20:35:53Z (GMT). No. of bitstreams: 3
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Integrated Nodal Estate Landscape: Reconnecting Baakse Beek Brook Eco-system & Recreation through Estate Landscape Development
No full textEstate landscapes are vulnerable to climate change. Especially regarding water management, these landscapes face severe challenges regarding shortage and abundance of water, which affects the gardens, ecosystem, forestry and agriculture of these estates. Also, many estates are still inaccessible and remain unknown to the broader public. This research focusses on the estate landscape of the Baakse Beek region while developing a spatial strategy that takes the natural brook ecosystem and the recreational system as the basis for a more resilient and future proof estate landscape. The brook ecosystem here is typical for the sandy grounds in the East of the Netherlands and was a base condition for the allocation of estates, while the recreational system refers to a balanced-interaction among humans, culture, and nature. It’s worthy to note that the estate landscapes, which have formed in Eastern Netherlands since the 16th Century, was always a balanced integration of these two systems. Over time the relation of the brook ecosystem and recreational system changed dramatically and grow apart due to sectoral developments that focussed solely on the agricultural optimization of the water system or economic development of recreation. This thesis mainly researched and proposed approaches how to develope the estates landscapes and surroundingd as several nodes to integrate the brook ecosystem and recreational system again.KaDEr research projectArchitecture, Urbanism and Building Sciences | Landscape Architectur
Personalized Machine Learning Methodologies for Real-world Stress Detection
No full textExposure to the long-term stress is harmful to both mental and physical health. So detecting and predicting stress are necessary, it can alert people and let them take actions to deal with stress in advance. In this thesis, with the purpose of classifying and modelling stress under the real-life scenario, two experiments and datasets were analyzed with different sensors, physiological signal features and machine learning methods. The first dataset was collected from real life records, which is called SWEET study project. In this experiment, problems like missing data and imbalanced class issue were discussed. Support Vector Machine, Random Forest and Naive Bayes classification techniques were compared, with Support Vector Machine achieving the highest performance. The second dataset was collected from designed experiments including Stroop Color Word test, math test and a stressful talk.For both datasets, relevant features include the heart rate, the galvanic skin response and skin temperature. The second dataset was also used to improve the prediction accuracy on the real-life dataset by applying transfer learning method, namely Tradboost algorithm and its adaptive technique, Dynamic Tradaboost algorithm. The limitations of this Tradboost model were also discussed in this thesis
Female perspective on the gender and sexual politics of late-Qing China
No full textx, 276 p. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number.The late-Qing tanci "A Pair of Male Phoenixes Flying Together" (Feng shuangfei ; preface dated 1899) is unusual for its depiction of a wide variety of gender issues and sexual relationships. Because the 52-chapter work is credibly attributed to the female poet Cheng Huiying, who is known to have written the poetry collection Beichuang yin 'gao , the tanci gives scholars a unique opportunity to see how a gentry woman thought of the gender roles and sexual politics of the late Qing.
My dissertation contains two major sections. Chapters I and II look at Cheng Huiying and her work as part of the `talented women" ( cainü ) culture. These two chapters demonstrate how Cheng Huiying deliberately establishes herself as a unique female writing subject and advocates women's agency in determining their own marriage arrangements. one of women's biggest concerns in premodern China.
Chapters III to VI put Feng shuangfei into the larger context of male-authored fiction and examine how it adopts and rewrites the conventions and motifs common to xiaoshuo fiction from a female writer's perspective. I first argue that Feng shuangfei can be considered a serious literary work due to its sophisticated structural design and characterization, although tanci are usually considered as more popular literature. I then evaluate how the female author of this tanci subtly reinvents three gendered motifs that commonly appear in male-authored xiaoshuo fiction. The three motifs are male same-sex eroticism and homosociality, female same-sex desires, and the stereotypes of shrew and ideal wife. Through subtle twists in the plot, the tanci suggests the possibility of the expression of female subjectivity and agency within patriarchal Confucian society even while it follows and supports the normative Confucian order.
The perspectives on gender norms and sexual practices offered in this tanci both display how a gentry woman thought about these issues in late imperial China and suggest how the rapid and vast social and ideological changes occurring during the turn of the century opened new spaces for Cheng Huiying to imagine increased agency and autonomy for women within the domestic sphere.Committee in charge: Maram Epstein, Chairperson, East Asian Languages & Literature;
Yugen Wang, Member, East Asian Languages & Literature;
Tze-lan Sang, Member, East Asian Languages & Literature;
Ina Asim, Outside Member, Histor
Research on the Value Implication of Sports Boosting the Great Revival of the Chinese Nation
No full textAbstract: The 20th National Congress of the CPC is a very important conference held at a critical moment when the Chinese people of all ethnic groups embark on a new journey of building a socialist modern country in an all-round way and march towards the second century goal. Deeply understand the twenty themes of the CPC, the call of the times of "three musts", the major political achievements of "two establishment", and the important connotation of "five firmly grasp". To study, publicize and implement the spirit of the 20th National Congress of the CPC is the primary political task and top priority of China's sports system at all levels at present and in the future. The report of the 20th National Congress of the CPC clearly put forward the task of accelerating the construction of a sports power, adhere to the people as the center, and build a sports power with the people enjoying the fruits of sports development as the purpose. Accelerating the construction of a sports power, bearing the hope of national prosperity and national rejuvenation, is the internal call to realize the Chinese Dream of the great rejuvenation of the Chinese nation.
Keywords: Xi Jinping; the Communist Party of China;The spirit of the Twentieth National Congress; Sports power; Value implication.
Title: Research on the Value Implication of Sports Boosting the Great Revival of the Chinese Nation
Author: Yu Xiang, Wen Ye, Xie Kun, Zhang Huiying, Wang Yue, Guo Si
International Journal of Recent Research in Social Sciences and Humanities (IJRRSSH)
ISSN 2349-7831
Vol. 10, Issue 1, January 2023 - March 2023
Page No: 9-14
Paper Publications
Website: www.paperpublications.org
Published Date: 04-January-2023
DOI: https://doi.org/10.5281/zenodo.7503254
Paper Download Link (Source)
https://www.paperpublications.org/upload/book/Research%20on%20the%20Value%20Implication-04012023-2.pdfInternational Journal of Recent Research in Social Sciences and Humanities (IJRRSSH), ISSN 2349-7831, Paper Publications, Website: www.paperpublications.or
Context-Sensitive Correlation and Fuzzy Collaborative Clustering Based Unsupervised Change Detection
No full textEnrichment of SNPs in functional categories reveals genes affecting complex traits
No full textGenome-wide association studies (GWAS) have indicated potential to identify heritability of common complex phenotypes, but traditional approaches have limited ability to detect hiding signals because single SNP has weak effect size accounting for only a small fraction of overall phenotypic variations. To improve the power of GWAS, methods have been developed to identify truly associated genes by jointly testing effects of all SNPs. However, equally considering all SNPs within a gene might dilute strong signals of SNPs in real functional categories. Here, we observed a consistent pattern on enrichment of significant SNPs in eight functional categories across six phenotypes, with the highest enrichment in coding and both UTR regions while the lowest enrichment in the intron. Based on the pattern of SNP enrichment in functional categories, we developed a new approach for detecting gene associations on traits (DGAT) by selecting the most significant functional category and then using SNPs within it to assess gene associations. The method was found to be robust in type I error rate on simulated data, and to have mostly higher power in detecting associated genes for three different diseases than other methods. Further analysis indicated ability of the DGAT to detect novel genes. The DGAT is available by http://sparks-lab.org/server/DGAT
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