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Search Results: 1 - 10 of 27991 matches for " MA Zhifei "
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Joint Detection/Decoding Algorithms for Nonbinary LDPC Codes over ISI Channels
Shancheng Zhao,Zhifei Lu,Xiao Ma,Baoming Bai
Mathematics , 2012,
Abstract: This paper is concerned with the application of nonbinary low-density parity-check (NB-LDPC) codes to binary input inter-symbol interference (ISI) channels. Two low-complexity joint detection/decoding algorithms are proposed. One is referred to as max-log-MAP/X-EMS algorithm, which is implemented by exchanging soft messages between the max-log-MAP detector and the extended min-sum (EMS) decoder. The max-log-MAP/X-EMS algorithm is applicable to general NB-LDPC codes. The other one, referred to as Viterbi/GMLGD algorithm, is designed in particular for majority-logic decodable NB-LDPC codes. The Viterbi/GMLGD algorithm works in an iterative manner by exchanging hard-decisions between the Viterbi detector and the generalized majority-logic decoder(GMLGD). As a by-product, a variant of the original EMS algorithm is proposed, which is referred to as \mu-EMS algorithm. In the \mu-EMS algorithm, the messages are truncated according to an adaptive threshold, resulting in a more efficient algorithm. Simulations results show that the max-log-MAP/X-EMS algorithm performs as well as the traditional iterative detection/decoding algorithm based on the BCJR algorithm and the QSPA, but with lower complexity. The complexity can be further reduced for majority-logic decodable NB-LDPC codes by executing the Viterbi/GMLGD algorithm with a performance degradation within one dB. Simulation results also confirm that the \mu-EMS algorithm requires lower computational loads than the EMS algorithm with a fixed threshold. These algorithms provide good candidates for trade-offs between performance and complexity.
Engineering imaging probes and molecular machines for nanomedicine
Sheng Tong,Thomas J. Cradick,Yan Ma,ZhiFei Dai,Gang Bao
Science China Life Sciences , 2012, DOI: 10.1007/s11427-012-4380-1
Abstract: Nanomedicine is an emerging field that integrates nanotechnology, biomolecular engineering, life sciences and medicine; it is expected to produce major breakthroughs in medical diagnostics and therapeutics. Due to the size-compatibility of nano-scale structures and devices with proteins and nucleic acids, the design, synthesis and application of nanoprobes, nanocarriers and nanomachines provide unprecedented opportunities for achieving a better control of biological processes, and drastic improvements in disease detection, therapy, and prevention. Recent advances in nanomedicine include the development of functional nanoparticle based molecular imaging probes, nano-structured materials as drug/gene carriers for in vivo delivery, and engineered molecular machines for treating single-gene disorders. This review focuses on the development of molecular imaging probes and engineered nucleases for nanomedicine, including quantum dot bioconjugates, quantum dot-fluorescent protein FRET probes, molecular beacons, magnetic and gold nanoparticle based imaging contrast agents, and the design and validation of zinc finger nucleases (ZFNs) and TAL effector nucleases (TALENs) for gene targeting. The challenges in translating nanomedicine approaches to clinical applications are discussed.
中国医疗卫生服务水平的空间分布特征及影响因素
Spatial distribution characteristics and influencing factors of health services in China

谢引引,周年兴,马欢欢,马志飞
XIE Yinyin
,ZHOU Nianxing,MA Huanhuan,MA Zhifei

- , 2018,
Abstract: 医疗卫生服务是公共服务的重要组成部分,也是建设健康中国的着力点.因此,医疗卫生服务水平的空间分布特征是健康地理学关注的重要问题.建立合理的指标体系,运用因子分析、标准差椭圆法以及空间计量分析模型计算了2004年、2009年以及2014年中国大陆各省份医疗服务水平并分析其空间分布特征和影响因素.结果表明:1)公立医院和民营医院的医疗卫生服务水平均呈现明显的东南-西北分化特征;2)医疗卫生服务水平的高值区为长三角地区、珠三角地区等经济发达地区和四川、河南等人口众多的省份,水平较低的地区分布在内蒙古自治区、青海省和西藏自治区等西部地区.3)空间计量回归模型结果发现,居民消费水平、一级医院数量、抚养比是影响公立医院医疗卫生服务水平的重要因素;居民消费水平、二级医院数量、抚养比和传染病的发病率对于民营医院影响显著.该研究对医疗卫生服务区域均衡政策的制定具有现实意义.
A Win-Win Solution Concerning Tax Planning for the Real Estate Development Enterprises and Government  [PDF]
Zhifei Liu, Ya Wen, Cheng Huang
Journal of Service Science and Management (JSSM) , 2014, DOI: 10.4236/jssm.2014.73018
Abstract:

Along with the advancement of China’s new urbanization, whether the real estate development enterprises can make a contribution to the new urbanization is becoming the key to their healthy and sustainable development. This article analyzes how to select LAT tax planning schemes in the background of the new urbanization; therefore, the real estate development enterprises can achieve a win-win situation with the new urbanization. We hope to provide some help to LAT tax planning work for the real estate development enterprises.

Experimental Study on the Radiative Properties of Fly Ash in the Radiant Syngas Cooler of Gasifier  [PDF]
Zhifei Fu, Qian Wang, Jiansheng Zhang
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.69002
Abstract:
Radiant syngas cooler (RSC) is the key heat recovery equipment in coal gasification system. The syngas from gasifier carries large amount of slags in which the mass fraction of fly ash less than 100 μm is about 20%. Studying the optical properties of fly ash has high significance for the optimization of heat transfer calculation in RSC. A new experimental method was proposed to inversely calculate the radiative parameters of particles—“KBr transmittance-reflectance method”. By measuring the “directional-hemispherical” reflectance and transmittance of fly ash particles by FTIR under the wavelength range of 0.55 - 1.65 μm, using the four-flux model to solve the radiative transfer equation and combing with Mie theory, the absorption and scattering efficiency of 22.7 μm fly ash and optical constant (also known as complex refractive index, m = n + ik) of fly ash were inversely calculated. The results indicated that for fly ash with large size parameter, there was no obvious change of the absorption and scattering efficiency when the mass fraction of Fe2O3 was between 5.65% and 16.53%, which was well explained by Mie theory; The obtained optical constant was close to the results of KBr trans-mittance method.
中国水资源利用的时空分布格局探究
The spatial-temporal distribution pattern of water resources utilization in China

尹上岗,马志飞,黄 萍,吴启焰,
YIN Shanggang
,MA Zhifei,HUANG Ping,WU Qiyan

- , 2017,
Abstract: 水资源的合理利用对区域经济社会发展,及促进人与自然的可持续发展至关重要.以2004年~2015年中国31个省级行政单元为研究对象,利用重心分析模型测度其时序移动轨迹,并对水资源利用类型的结构变化进行探析,在此基础上,探究我国各省份的水资源利用效率的时空变化特征.研究表明:我国水资源总量的重心移动轨迹有很大的不稳定性,而水资源用量的重心移动轨迹大致呈“Z”型变化;生态用水和工业用水的空间变化差异最大,农业用水和生活用水空间变化差异较小;用水总量的变化差异和农业用水的变化差异空间分布基本一致;我国水资源利用效率基本上呈现出东高西低的阶梯状格局.
Dll4/Notch Signaling Pathway and Tumor Angiogenesis
Xinyu DING,Zhifei XU
Chinese Journal of Lung Cancer , 2009,
Abstract:
Global Regularity for the Navier-Stokes equations with large, slowly varying initial data in the vertical direction
Marius Paicu,Zhifei Zhang
Physics , 2009,
Abstract: In a recent article, J.-Y. Chemin, I. Gallagher and M. Paicu obtained a class of large initial data generating a global smooth solution to the three dimensional, incompressible Navier-Stokes equations. This data varies slowly in the vertical direction (is a function on $\epsilon x_3$) and has a norm which blows up as the small parameter goes to zero. This type of initial data can be seen as the "ill prepared" case (in opposite with the "well prepared" case which was treated previously by J.-Y. Chemin and I. Gallagher). In that paper, the fluid evolves in a special domain, namely $\Omega=T^2_h\times\R_v$. The choice of a periodic domain in the horizontal variable plays an important role. The aim of this article is to study the case where the fluid evolves in the full spaces $\R^3$, case where we need to overcome the difficulties coming from very low horizontal frequencies. We consider in this paper an intermediate situation between the "well prepared" case and "ill prepared" situation (the norms of the horizontal components of initial data are small but the norm of the vertical component blows up as the small parameter goes to zero). The proof uses the analytical-type estimates and the special structure of the nonlinear term of the equation.
Well-posedness of the Hele-Shaw-Cahn-Hilliard system
Xiaoming Wang,Zhifei Zhang
Mathematics , 2010,
Abstract: We study the well-posedness of the Hele-Shaw-Cahn-Hilliard system modeling binary fluid flow in porous media with arbitrary viscosity contrast but matched density between the components. For initial data in $H^s, s>\frac{d}{2}+1$, the existence and uniqueness of solution in $C([0, T]; H^s)\cap L^2(0, T; H^{s+2})$ that is global in time in the two dimensional case ($d=2$) and local in time in the three dimensional case ($d=3$) are established. Several blow-up criterions in the three dimensional case are provided as well. One of the tools that we utilized is the Littlewood-Paley theory in order to establish certain key commutator estimates.
Break-down criterion for the water-wave equation
Chao Wang,Zhifei Zhang
Mathematics , 2013,
Abstract: We study the break-down mechanism of smooth solution for the gravity water-wave equation of infinite depth. It is proved that if the mean curvature $\kappa$ of the free surface $\Sigma_t$, the trace $(V,B)$ of the velocity at the free surface, and the outer normal derivative $\frac {\pa P} {\pa \textbf{n}}$ of the pressure $P$ satisfy \beno &&\displaystyle\sup_{t\in [0,T]}\|\kappa(t)\|_{L^p\cap L^2}+\int_0^T\|(\na V, \na B)(t)\|_{L^\infty}^6dt<+\infty, &\displaystyle\inf_{(t,x,y)\in [0,T]\times \Sigma_t}-\frac {\pa P} {\pa \textbf{n}}(t,x,y)\ge c_0, \eeno for some $p>2d$ and $c_0>0$, then the solution can be extended after $t=T$.
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