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Search Results: 1 - 10 of 65521 matches for " Ru-Yu Lien "
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Classification and regression tree analysis in acute coronary syndrome patients  [PDF]
Heng-Hsin Tung, Chiang-Yi Chen, Kuan-Chia Lin, Nai-Kuan Chou, Jyun-Yi Lee, Daniel L. Clinciu, Ru-Yu Lien
World Journal of Cardiovascular Diseases (WJCD) , 2012, DOI: 10.4236/wjcd.2012.23030
Abstract: Objectives: The objectives of this study are to use CART (Classification and regression tree) and step-wise regression to 1) define the predictors of quality of life in ACS (acute coronary syndrome) patients, using demographics, ACS symptoms, and anxiety as independent variables; and 2) discuss and compare the results of these two statistical approaches. Back- ground: In outcome studies of ACS, CART is a good alternative approach to linear regression; however, CART is rarely used. Methods: A descriptive survey design was used with 100 samples recruited. Result and Conclusions: Anxiety is the most significant predictor and also a stronger predictor than symptoms of ACS for the quality of life. The anxiety level patients experienced at the time heart attack occurred can be used to predict quality of life a month later. Furthermore, the majority of ACS patients experienced a moderate to high level of anxiety during a heart attack.
Stability estimates for the inverse boundary value problem by partial Cauchy data
Ru-Yu Lai
Physics , 2013,
Abstract: In this paper we study the inverse conductivity problem with partial data in dimension $n\geq 3$. We derive stability estimates for this inverse problem if the conductivity has $C^{1,\sigma}(\bar\Omega)\cap H^{3/2+\sigma}(\Omega)$ regularity for $0<\sigma<1$.
Reconstruct Lame parameters of linear isotropic elasticity system
Ru-Yu Lai
Mathematics , 2013,
Abstract: Transient Elastography enables detection and characterization of tissue abnormalities. In this paper we assume that the displacements are modeled by linear isotropic elasticity system and the tissue displacement has been obtained by the first step in hybrid methods. Then we reconstruct the Lam\'e parameters of this system from knowledge of tissue displacement. We show that for a sufficiently large number of solutions of the elasticity system and for an open set of the well-chosen boundary conditions, $(\lambda,\mu)$ can be uniquely and stably reconstructed. The set of well-chosen boundary conditions is characterized in terms of appropriate complex geometrical optics solutions.
Increasing stability for optical tomography
Ru-Yu Lai
Mathematics , 2013,
Abstract: We study the phenomenon of increasing stability in the diffuse optical tomography (DOT). It is well-known that the DOT inverse problem is exponentially ill-posed. In this paper, we show that the ill-posedness decreases when we increase the frequency.
Increasing stability for the conductivity and attenuation coefficients
Ru-Yu Lai,Victor Isakov,Jenn-Nan Wang
Mathematics , 2015,
Abstract: In this work we consider stability of recovery of the conductivity and attenuation coefficients of the stationary Maxwell and Schr\"odinger equations from a complete set of (Cauchy) boundary data. By using complex geometrical optics solutions we derive some bounds which can be viewed as an evidence of increasing stability in these inverse problems when frequency is growing.
Inverse boundary value problem for the Stokes and the Navier-Stokes equations in the plane
Ru-Yu Lai,Gunther Uhlmann,Jenn-Nan Wang
Mathematics , 2014, DOI: 10.1007/s00205-014-0794-1
Abstract: In this paper, we prove in two dimensions global identifiability of the viscosity in an incompressible fluid by making boundary measurements. The main contribution of this work is to use more natural boundary measurements, the Cauchy forces, than the Dirichlet-to-Neumann map previously considered in \cite{IY} to prove the uniqueness of the viscosity for the Stokes equations and for the Navier-Stokes equations.
Evaluating the Performance of Taiwan Homestay Using Analytic Network Process
Yi-Chung Hu,Jen-Hung Wang,Ru-Yu Wang
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/827193
Abstract: Homestay industry in Taiwan is not only thriving, but also its operation is moving gradually toward elaboration strategy and in a specialized-operation manner these years. Nevertheless, the evaluation frameworks of the earlier studies were sporadically constructed from an overall perspective of homestays. Moreover, the functions, operational model, and natures of homestays are dissimilar to those of hotels; therefore, if the evaluation criteria of homestays employ the ones of hotels, it would appear to be incoherent and incompatible. This study has accordingly developed and constructed a set of evaluation indicators tailor-made for homestay sector through discussion of literatures and interviewing experts so that the evaluation framework would be more comprehensive and more practical. In the process of interviewing experts, it was discovered that dependences lay on the aspects and criteria. Consequently, this research chose the ANP (analytic network process) to get the weights and, further, to acquire the homestay business performance through fuzzy theory. The result reveals, as regards key aspects, homestay proprietors and customer groups both weight the surroundings of the building and features, service quality, operation, and management most. In respect to overall homestay performance, customer groups consider it has reached the satisfactory level.
Applications of CGO Solutions on Inverse Problems of Coupled-Physics Imaging Methods
Ilker Kocyigit,Ru-Yu Lai,Lingyun Qiu,Yang Yang,Ting Zhou
Mathematics , 2015,
Abstract: This paper surveys inverse problems arising in several coupled-physics imaging modalities for both medical and geophysical purposes. These include Photo-acoustic Tomography (PAT), Thermo-acoustic Tomography (TAT), Electro-Seismic Conversion, Transient Elastrography (TE) and Acousto-Electric Tomography (AET). These inverse problems typically consists of multiple inverse steps, each of which corresponds to one of the wave propagations involved. The review focus on those steps known as the inverse problems with internal data, in which the complex geometrical optics (CGO) solutions to the underlying equations turn out to be useful in showing the uniqueness and stability in determining the desired information.
Dynamic process services optimized combination for BPEL4WS based on process tree
基于流程树的BPEL4WS中流程服务动态优化方法*

WEN Jun-hao,SHU Zhi-qiang,QIN Ru-Yu,LI Peng,
文俊浩
,舒志强,秦如玉,李朋

计算机应用研究 , 2010,
Abstract: Business process execution language for Web services (BPEL4WS) was difficult to meet the needs of individual users as well as unable to adapt to dynamic changes in the environment. To deal with this problem, the paper presented a method of dynamic process services optimized combination for BPEL4WS, which provided a Web service interactive cost calculation model used to evaluate user preferences for Web service and the actual cost of Web services interaction in the actual environment. Firstly, converted service process described by BPEL4WS into a service process tree, which was checked by domain ontology in order to prevent the logic errors of service process composition. Then, dynamic optimized the orders of service process by partheno genetic algorithm in the process of depth-first traversal of the process tree. Finally gave an application case to validate the proposed approach and the adaptability and efficiency of partheno genetic algorithm, which was used to optimize service process, is checked by experiment results.
Advances in the Chiral Resolution of Organophosphorus Compounds by Liquid Chromatography
手性有机磷化合物液相拆分的研究进展

Ai-ling Zhou,Xian-yu,Jun-min Huang,Xin-sheng Wang,Ru-yu Gao,
周爱玲
,吕宪禹,黄君珉,王新省,高如瑜

色谱 , 2002,
Abstract: The developments in the chiral resolution of organophosphorus compounds by liquid chromatography in recent years are reviewed. Two different approaches of separation: indirect resolution (chiral derivatization reagent method) and direct resolution (chiral mobile phase additive and chiral stationary phase), focusing on several chiral stationary phases--Pirkle type, cyclodextrin, cellulose, ligand exchange and other chiral stationary phases are presented. The possible mechanism of chiral recognition is discussed. Eighty-five references are involved.
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