OALib Journal期刊

ISSN: 2333-9721




2018 ( 349 )

2017 ( 317 )

2016 ( 354 )

2015 ( 3745 )


匹配条件: “Ting Li” ,找到相关结果约124416条。
An Optimal Algorithm for Over-the-Air Reprogramming Protocol in WSNs  [PDF]
Ting WEN, Zhi LI
Communications and Network (CN) , 2009, DOI: 10.4236/cn.2009.12017
Abstract: The over-the-air reprogramming has played an important role in Wireless Sensor Networks (WSNs), and has been widely researched. But the problems of low efficiency and high energy consumption have brought new challenges to the research. This paper presents an optimal algorithm, it is targeted to address the problem of relatively low efficiency and high energy consumption in over-the-air reprogramming in WSNs. Simulation results demonstrate that the optimal algorithm can improve the efficiency of over-the-air reprogramming in WSNs, and make the energy consumption in network not only lower but more balanced.
A Domain Extension Algorithm for Digital Error Correction of Pipeline ADCs  [PDF]
Ting Li, Chao You
Circuits and Systems (CS) , 2014, DOI: 10.4236/cs.2014.52006

A domain extension algorithm to correct the comparator offsets of pipeline analog-to-digital converters (ADCs) is presented, in which the 1.5-bit/stage ADC quantify domain is extended from a three-domain to a five-domain. This algorithm is designed for high speed and low comparator accuracy application. The comparator offset correction ability is improved. This new approach also promises significant improvements to the spurious-free dynamic range (SFDR), the total harmonic distortion (THD), the signal-to-noise ratio (SNR) and the minor analog and digital circuit modifications. Behavioral simulation results are presented to demonstrate the effectiveness of the algorithm, in which all absolute values of comparator offsets are set to |3Vref/8|. SFDR, THD and SNR are improved, from 34.62-dB, 34.63-dB and 30.33-dB to 60.23-dB, 61.14-dB and 59.35-dB, respectively, for a 10-bit pipeline ADC.

Effects of Shenqi Jiedu Decoction on expressions of transforming growth factor-β1, smad2 and smad3 in renal tissues of rats with chronic renal failure induced by adenine
Ting-ting LI
Zhong Xi Yi Jie He Xue Bao , 2010,
Abstract: Objective: To investigate the effects of Shenqi Jiedu Decoction (SQJDD), a compound traditional Chinese herbal medicine, on expressions of transforming growth factor beta1 (TGF-β1), smad2 and smad3 proteins in renal tissues of rats with chronic renal failure (CRF) induced by adenine, and to explore the mechanisms of SQJDD in treating CRF. Methods: Ninety healthy Wistar male rats were randomly divided into six groups: normal group, untreated group, losartan group, low-dose SQJDD group, medium-dose SQJDD group, and high-dose SQJDD group. Rat model of CRF was established by feeding 2.5% adenine. Levels of plasma creatinine (Cr) and blood urea nitrogen (BUN) in different groups after model establishment were detected to estimate the renal function of rats with CRF. After eight-week treatment, levels of Cr, BUN, triacylglycerol (TAG), cholesterol (Chol) and albumin (ALB) in plasma were detected. Pathological changes of renal tissues were observed by HE staining. Protein expressions of TGF-β1, Smad2 and Smad3 in renal tissues were detected by Western blotting. Results: Compared with pretreatment, levels of Cr and BUN in the losartan group and the SQJDD groups were markedly decreased (P<0.01). After treatment, levels of Cr, BUN and Chol in all treated groups were lower than those in the untreated group (P<0.01, P<0.05). Levels of ALB in all treated groups were higher than that in the untreated group (P<0.01). Pathological lesions of renal tissues in all treated groups were lessened as compared with the untreated group (P<0.01). The Western blotting results showed that the protein expressions of TGF-β1, Smad2 and Smad3 in renal tissues in all treated groups were lower than those in the untreated group (P<0.01). Conclusion: SQJDD can delay the progress of CRF by inhibiting TGF-β1/Smads signal transduction pathway.
Purely Algebraic Method to Construct Toric Schemes
Ting Li
Mathematics , 2007,
Abstract: In this article, we first give some elementary proprieties of monoids and fans, then construct a toric scheme over an arbitrary ring, from a given fan. Using Valuative Criterion, we prove that this scheme is separated and give the sufficient and necessary condition when it is proper. We also study the regularity and logarithmic regularity of it. Finally we study the morphisms of toric schemes induced by the homomorphisms of fans.
The étale Homology and The Cycle Maps in Adic Coefficients
Ting Li
Mathematics , 2007,
Abstract: In this article, we define the l-adic homology for a morphism of schemes satisfying certain finiteness conditions. This homology has these functors similar to the Chow groups: proper push-forward, flat pull-back, base change, cap-product, etc. In particular on singular varieties, this kind of l-adic homology behaves much better that the classical l-adic cohomology. As an application, we give an much easier approach to construct the cycle maps for arbitrary algebraic schemes over fields of finite cohomology dimension. And we prove these cycle maps kill the algebraic equivalences and commute with the Chern action of locally free sheaves.
Log Structures on Generalized Semi-Stable Varieties
Ting Li
Mathematics , 2007,
Abstract: This is my PhD Thesis, part of it has published in Acta Mathematica Sinica. In this paper, a class of morphisms which have a kind of singularity weaker than normal crossing is considered. We construct the obstruction such that the so-called semi-stable log structures exists if and only if the obstruction vanishes. In the case of no power, if the obstruction vanishes, then the semi-stable log structure is unique up to a unique isomorphism. So we obtain a kind of canonical structures on this family of morphisms.
The $\ell$-adic Dualizing Complex on an Excellent Surface with Rational Singularities
Ting Li
Mathematics , 2008,
Abstract: In this article, we show that if $X$ is an excellent surface with rational singularities, the constant sheaf $\mathbb{Q}_{\ell}$ is a dualizing complex. In coefficient $\mathbb{Z}_{\ell}$, we also prove that the obstruction for $\mathbb{Z}_{\ell}$ to become a dualizing complex lying on the divisor class groups at singular points. As applications, we study the perverse sheaves and the weights of $\ell$-adic cohomology groups on such surfaces.
A New Perspective to Evaluate Doppler Vascular Impedance in Hypertensive Disorders Complicating Pregnancy: Multilevel Modeling Established in a Case Control Study  [PDF]
Ting Yuan, Ting Zhang, Chao Li, Zhen Han
Open Journal of Obstetrics and Gynecology (OJOG) , 2015, DOI: 10.4236/ojog.2015.56051
Abstract: Background: There have been researches on the evaluation of Doppler vascular impedance in hypertensive disorders complicating pregnancy (HDCP). With respect to the method of analysis used and the conclusions drawn in previous studies, different vessels were usually viewed separately and independently. This study was designed to evaluate Doppler vascular impedance changes in HDCP from a new perspective, with original thought and insight into an ordinary issue. Methods: 273 pregnant women (110 hypertensive pregnancies and 163 normotensive pregnancies) were randomly included in a grouping case-control study conducted from February 10, 2011 to April 30, 2013. All women in the study underwent Doppler measurements of six different vessels including the umbilical artery, the uterine arteries, the placental bed spiral artery, the fetal middle cerebral artery and the fetal renal artery. Doppler vascular impedance was presented as pulsatility index (PI), resistance index (RI), and systolic and diastolic ratio (S/D). Doppler changes in the hypertensive and normotensive groups were assessed by the multilevel modeling approach with univariate and multivariate-adjusted analyses. Results: According to multilevel modeling approach with multivariate-adjusted analysis, a relatively average evaluation on Doppler vascular impedance was provided. Hypertension was significantly associated with positive effects on PI, RI and S/D values (coefficients were 0.10, 0.03 and 0.08, respectively; 95% CIs were 0.06 - 0.14, 0.02 - 0.04 and 0.04 - 0.11, respectively; P values were all less than 0.001) in comparison with normotensive group. Conclusion: According to an overall evaluation, Doppler vascular impedance in hypertensive disorders complicating pregnancy was higher than in normotensive pregnancy. The novel thought and approach applied in this research may bring about inspirations for better understanding and assessment of the disease.
Two-Dimensional Medical Image 3D Visualization System’s Realization  [PDF]
Ai Ting, Li Zhe, Miao Yu
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31B007
Abstract: With the development of virtual reality application in the medical field, two-dimensional medical image of the three-dimensional visualization technology made possible. Surgery gets into minimally invasive operation microscopy Era, and gradually becomes a new research hotspot. This paper studies the realization of two-dimensional medical im-age 3D reconstruction visualization system method, and the overall process and management module. Using the main technology of VTK (The Visualization Toolkit) to achieve a two-dimensional medical image three-dimensional visua-lization system, which can help the physician to obtain help clinical diagnosis Information and play an important role in treatment, accurate positioning in diseased tissue and tumor early diagnosis.
Research on the Effects, Problems and Strategies of Comprehensive Reform Policy of Private Education in China  [PDF]
Huapeng Dai, Ting Li, Yu Wen
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.210010
Abstract: While the comprehensive reform policies of private education have achieved remarkable results, further reforms are needed to promote the better development of non-governmental education. The research group carried out fieldwork in 25 schools in city X, where the policy implementation, effects of implementation, existing problems and causes were all thoroughly analyzed. The results show that classified management, teachers’ social insurance and government purchase services have been properly implemented. However, limited school autonomy, inequality of payment between teachers of private and public schools, investment and financing difficulties, lack of financial support, and limited land share remain serious problems. Therefore, it is argued that the allocation distribution for public and private schools should be adjusted, the team dynamic of private school teachers should be further strengthened, and schools should be administered independently. It also requires broadening the investment and financing channels, adopting a system of mixed ownership, and developing an innovative system to manage schools. The first step in this process requires following the direction of optimizing the quality of private schools and achieving equalization with public schools. Second, existing mechanisms should be enhanced to link government, department-coordination, grassroots innovation and the participation of the public. Third, according to the specific regional situation, resources should be allocated to promote the formation of mutual development patterns for public and private education in China.

Copyright © 2008-2017 Open Access Library. All rights reserved.