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Search Results: 1 - 10 of 42389 matches for " Xin Zheng "
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Simulation Analysis of Multiple BP Decoding Algorithm and FFT-BP Decoding Algorithm  [PDF]
Xin Wei, Zhigang Li, Zheng Dou
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.108B027
In order to solve the problem that the original decoding algorithm of multi-band LDPC codes is high and is not conducive to hardware implementation, two simplified decoding algorithms for multi-band LDPC codes are studied: the reliability propagation based on fast Fourier transform Code algorithm (FFT-BP) and log-BP decoding algorithm based on logarithmic operations. The simulation results show that the FFT-BP decoding algorithm is more convenient and efficient.
The relaxing ori-ter balance of Mycoplasma genomes
Xin Zheng,ShuLin Liu
Science China Life Sciences , 2008, DOI: 10.1007/s11427-008-0017-9
Abstract: Mycoplasma are wall-less bacteria with small genomes, which are thought to have resulted from massive genome reductive processes, during which the ori-ter balance may be disrupted. For technical difficulties, ori and ter have been located only in a few Mycoplasma strains. Using the Z curve method, we were able to locate turning points on the Mycoplasma genomes, with the minimum and maximum points co-locating with ori or ter in the reference genomes. Assuming Z curve correctly located ori and ter, we calculated the distances from ori to ter in both directions on the circular genome and calculated the ori-ter balance status. The Mycoplasma genomes were not balanced, possibly as a result of close association of Mycoplasma with hosts, where there would be no other microbes for Mycoplasma to compete with for nutrients, so fastest possible growth related to balanced genomes might not be needed by Mycoplasma, leading to a relaxing ori-ter balance.
Whole fossil plants of Ephedra and their implications on the morphology, ecology and evolution of Ephedraceae (Gnetales)
Xin Wang,ShaoLin Zheng
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3069-8
Abstract: Although there are many reports of fossil Ephedraceae, whole plant fossil record remains rare. Due to a lack of trust on partially preserved fossil materials, scholars working on molecular clock proposed a recent origin of Ephedra and cast doubt on the earlier origin time of Ephedraceae. To better the understanding on this interesting group, here we report whole plants of Ephedra hongtaoi sp. nov. (Ephedraceae, Gnetales) from the Yixian Formation (Early Cretaceous) in western Liaoning, China. These whole plants of Ephedra demonstrate clearly the characters of Ephedra, including shrubby growth habit, decussate branching pattern, and terminal ovuliferous unit with micropylar tube. The whole-plant preservation of the fossils provides more convincing fossil evidence of Early Cretaceous Ephedra, helps to resolve the controversy over the origin time of Ephedra, and sheds light on the whole plant morphology, growth habit, ecology and evolution of Ephedraceae.
A traditional Chinese medicine therapy warming meridians to nourish blood in treating chronic pain due to soft tissue injury of the neck and shoulder: a randomized controlled trial
Zhi-xin Zheng
Zhong Xi Yi Jie He Xue Bao , 2011,
Abstract: Background: Pain due to chronic soft tissue injury of the neck and shoulder is a commonly encountered and frequently occurring condition. Traditional Chinese medicine is a common course of treatment for soft tissue injury and may have better therapeutic effects than biomedical options.Objective: To evaluate the clinical therapeutic effects of Chinese herbal medicine warming meridians to nourish blood on chronic pain due to soft tissue injury in the neck and shoulder.Design, setting, participants and interventions: A random and control method was adopted. Sixty-three patients with pain of the neck and shoulder due to chronic soft tissue injury, presenting with blood deficiency and cold coagulation syndrome, were randomly divided into treatment group (n=32) and control group (n=31). There was a drop-out case in treatment group. All the patients were collected from the clinic service of the Department of Rehabilitation at the General Hospital of the People’s Liberation Army. Patients received oral and written information about clinical procedures before signing their written informed consent. Patients in the treatment group were treated with Chinese herbal decoctions for warming meridians to nourish blood and cervical traction. Patients in the control group were treated with cervical traction. The course of treatment was 14 days.Main outcome measures: A visual analog scale (VAS) was used to record test data in the two groups before and after treatment, and therapeutic effect was compared after treatment between the two groups.Results: After treatment, VAS scores of the treatment group and the control group were decreased as compared with before treatment (t=5.01, P<0.01; t=4.91, P<0.01). Difference of VAS scores between before and after treatment in the treatment group was higher than that in the control group (t=2.44, P<0.05). Conclusion: The treatment method of warming meridians to nourish blood combined with cervical traction has better therapeutic effect than only applying traction for chronic pain due to soft tissue injury of the neck and shoulder.
Brief Analysis of How Universities Resolve Heavy Debt Crisis
Wei Zheng,Xin Zhang
Asian Social Science , 2012, DOI: 10.5539/ass.v8n7p136
Abstract: In the past few years, the phenomenon of indebted school running in universities and the problem of how universities resolve the debt and overcome the debt crisis have received more and more attention from people. In the light of this phenomenon and considering the actual problems in universities, this article proposes several countermeasures and suggestions to resolve bank debt for universities.
Problems and Countermeasures in the Teaching of College Accounting Computerization
Wei Zheng,Xin Zhang
Asian Social Science , 2011, DOI: 10.5539/ass.v7n7p235
Abstract: The course offering, the course content, the teaching method, the teaching software, the teacher power, and the practical teaching mode about the teaching of accounting computerization in colleges are analyzed first, and then corresponding solutions are proposed in this article.
Time budgets of Tibetan eared pheasants during the non-breeding season in an alpine scrub habitat
Xin LU,Guangmei ZHENG
Current Zoology , 2009,
Abstract: Time allocations of the group-living Tibetan eared pheasants Crossoptilon harmani with and without supplementary food were investigated by full-day sampling from winter through spring in an alpine shrub zone, south Tibet. At a flock scale, both the different food-supply flocks displayed similar daily patterns of activity, foraging in the morning and evening, and resting around midday. In terms of individual activity, either foraging or resting was highly synchronous with the flock’s. Non-provisioned birds spent more time feeding and less resting in midwinter than in late autumn. In early spring as climates became warmer and day longer, however, non-provisioned birds did not decrease their feeding efforts significantly but the provisioned birds did. Across the non-breeding seasons, the provisioned birds (relying on nutrition-rich artificial foods) devoted less time to feeding and more to resting than did the non-provisioned ones (relying on nutrition-poor plant roots). Multivariate analysis showed increased food supply and ambient temperature resulted in a reduced foraging effort. However, the fact that the non-provisioned birds can save daily time for resting even in the cold short midwinter indicated that they faced no energetic constraint. Thus, protecting shelter vegetation rather than providing extra food is suggested to be important for long-term survival of the endangered galliform birds [Current Zoology 55(3):193–199,2009].
Overcomplete Bases for S = 1 Spin Liquids
Zheng-Xin Liu
Physics , 2014,
Abstract: For a $S=1$ system with even number of spins, the product states of two-body singlets, called the singlet pair states (SPSs), are overcomplete bases for the Hilbert space of many-body singlets. If the system contains odd number of spins, a singlet state can be decomposed as a superposition of all of the following configurations, in each configuration three of the spins form a three-body singlet and the remaining form two-body singlet pairs. This indicates that a $S=1$ spin liquid is especially a resonating-valence bond state. Although this conclusion is no longer valid for $SO(3)$ symmetric $S>1$ systems, it can be generalized to an integer spin-$S$ system if it has an enlarged $SO(2S+1)$ symmetry. Similar results can also be obtained for systems with $SU(n)$ symmetry.
Intensity Process for a Pure Jump Lévy Structural Model with Incomplete Information
Xin Dong,Harry Zheng
Quantitative Finance , 2014,
Abstract: In this paper we discuss a credit risk model with a pure jump L\'evy process for the asset value and an unobservable random barrier. The default time is the first time when the asset value falls below the barrier. Using the indistinguishability of the intensity process and the likelihood process, we prove the existence of the intensity process of the default time and find its explicit representation in terms of the distance between the asset value and its running minimal value. We apply the result to find the instantaneous credit spread process and illustrate it with a numerical example.
Optimal investment-reinsurance policy under a long-term perspective
Xiaoxiao Zheng,Xin Zhang
Quantitative Finance , 2014,
Abstract: In this paper, we assume an insure is allowed to purchase proportional reinsurance and can invest his or her wealth into the financial market where a savings account, stocks and bonds are available. Different from classical optimal investment and reinsurance problem, this paper studies the insurer's long-term investment decision. Under this setting, our model consider the interest risk and the inflation risk. Specifically, we suppose the interest rate follows a stochastic process, while price index is described by a classical model. By solving Hamilton-Jacobi-Bellman equation, the closed-form expression of the optimal policy is obtained. Further, we prove the corresponding verification theorem without the usual Lipschitz condition. In the end, numerical examples are made to illustrate the difference of the optimal polices under Ho-lee model and Vasicek model.
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