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Search Results: 1 - 10 of 32529 matches for " JIAN Heng "
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Correlations in Grover search
Jian Cui,Heng Fan
Mathematics , 2009, DOI: 10.1088/1751-8113/43/4/045305
Abstract: Grover search is a well-known quantum algorithm that outperforms any classical search algorithm. It is known that quantum correlations such as entanglement are necessary for the power of quantum computation. But entanglement is not the only kind of quantum correlations. Other quantum correlations such as quantum discord are also useful to capture some aspects of the nonclassical correlation. We investigate several kinds of correlations including both quantum and classical in the whole process of Grover search algorithm. These correlations are the concurrence, entanglement of formation, quantum discord, classical correlation and mutual information. The behaviors of quantum discord, classical correlation and mutual information are almost the same while the concurrence is different. When the search is over, all kinds of correlations are zero, we argue that this is necessary for the final step in the search.
Estimate of Heavy Metals in Soil with Non-Soil Removed  [PDF]
Ji Jian, Yao Fang, Wei-Le Li, Qian-Yu Chen, Heng-Yu Tian, Shuang-Lin You
Journal of Data Analysis and Information Processing (JDAIP) , 2017, DOI: 10.4236/jdaip.2017.54011
Abstract: Quantifying and mapping heavy metals’ concentrations in the soil are important in monitoring and managing heavy metal pollution in the mining areas. However, the cover on the soil acts as a balk when retrieving information from soil. In order to retrieve heavy metal pollution precisely and quickly from hyperspectral images, this study presents a new method to remove non-soil information based NDVI from hyper-spectral and multi-spectral images. The method assumed that the mixed objects in each pixel of remote sensing images are composed only of soil and vegetation-based non-soil end-generational endmembers, then, the soil information of each pixel can be compensated with the non-soil information removed based on its NDVI. Thus, the soil DN value can be corrected to retrieve soil information more precisely. The method has been used on the Hyperion image in June 8, 2002 and the Gaofen-2 (GF-2) image in February 14, 2016 to retrieve the heavy metals’ contents in Bai-ma and De-sheng mining areas, Miyi County, Sichuan Province. From the non-soil information removed images, the R2 and RMSE of the models of estimating Cr, Ag, Cu and Ba in soil are 0.68, 0.724, 0.71, 0.695 and 75.96, 0.03, 52.88, 284.70 respectively. From the original images, the R2 and RMSE of the models of estimating Cr, Ag, Cu and Ba in soil are 0.67, 0.385, 0.425, 0.406 and 80.11, 0.18, 53.43, 396.49 respectively. The retrieval results show that the non-soil information removed images are superior to original images in soil heavy metals’ contents retrieval. This indicates that this method is feasible, and it can be used in soil information retrieval.
Overexpression of Angiopoietin-1 Increases CD133+/c-kit+ Cells and Reduces Myocardial Apoptosis in db/db Mouse Infarcted Hearts
Heng Zeng, Lanfang Li, Jian-Xiong Chen
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0035905
Abstract: Hematopoietic progenitor CD133+/c-kit+ cells have been shown to be involved in myocardial healing following myocardial infarction (MI). Previously we demonstrated that angiopoietin-1(Ang-1) is beneficial in the repair of diabetic infarcted hearts. We now investigate whether Ang-1 affects CD133+/c-kit+ cell recruitment to the infarcted myocardium thereby mediating cardiac repair in type II (db/db) diabetic mice. db/db mice were administered either adenovirus Ang-1 (Ad-Ang-1) or Ad-β-gal systemically immediately after ligation of the left anterior descending coronary artery (LAD). Overexpression of Ang-1 resulted in a significant increase in CXCR-4/SDF-1α expression and promoted CD133+/c-kit+, CD133+/CXCR-4+ and CD133+/SDF-1α+ cell recruitment into ischemic hearts. Overexpression of Ang-1 led to significant increases in number of CD31+ and smooth muscle-like cells and VEGF expression in bone marrow (BM). This was accompanied by significant decreases in cardiac apoptosis and fibrosis and an increase in myocardial capillary density. Ang-1 also upregulated Jagged-1, Notch3 and apelin expression followed by increases in arteriole formation in the infarcted myocardium. Furthermore, overexpression of Ang-1 resulted in a significant improvement of cardiac functional recovery after 14 days of ischemia. Our data strongly suggest that Ang-1 attenuates cardiac apoptosis and promotes cardiac repair by a mechanism involving in promoting CD133+/c-kit+ cells and angiogenesis in diabetic db/db mouse infarcted hearts.
Identification of the 15FRFG domain in HIV-1 Gag p6 essential for Vpr packaging into the virion
Henghu Zhu, Heng Jian, Ling-Jun Zhao
Retrovirology , 2004, DOI: 10.1186/1742-4690-1-26
Abstract: Vpr is a 15 kDa auxiliary regulatory protein of HIV-1 produced in the late phase of the viral life cycle and packaged in the virion [1-3]. Thus, Vpr has the capacity to function both in the early phase and the late phase of the viral life cycle. A number of biological activities have been assigned to Vpr, including nuclear localization [4-6], transcriptional effects [7,8], cell cycle arrest at the G2/M check point [9-13], and pro- and anti-apoptotic activities [14-18]. In most cases the direct cellular target for Vpr remains to be identified. It is possible that Vpr has multiple unrelated functions to facilitate HIV-1 interaction with the host cells. Alternatively, some of the biological activities of Vpr may be explained by a common mechanism.Transiently expressed Vpr localizes in the nucleus, and specific nuclear localization signals have been identified in Vpr [6]. Vpr nuclear transport has been correlated with interaction with importin a [19]. However, the nuclear localization of Vpr appears to be more complicated since Vpr is also found to interact with residents of the nuclear pore complex [20]. Notably, Vpr is found to interact with the FG repeat domain of rat Poml21, which is a nuclear pore protein [20]. However, in similar assays Vpr fails to interact with the FG repeat domain of other nuclear pore proteins [20]. Thus, the exact specificity of this interaction remains uncharacterized.Virion packaging of Vpr is through interaction with the Gag C-terminal p6 domain [1]. With vaccinia expression of HIV-1 Gag and Vpr, a (Lxx)4 domain (amino acid #35–46) in HIV-1 p6 was determined to be essential for virion packaging of Vpr [21]. Fusion of MLV Gag with the HIV-1 p6 domain allows the fusion protein to package Vpr [22]. Under this condition, single point mutations of L45A or F46A within the (Lxx)4 domain abolish Vpr virion packaging [22]. The direct interaction of HIV-1 p6 with Vpr appears to be rather weak, detectible only by using a sensitive in vitro assay [23]

Heng Jian CUI,Xiu Yong YUAN,

系统科学与数学 , 2001,
Abstract: A confidence interval of p-quantile by empirical likelihood is given in paper 4]. This paper gives a confidence interval of p-quantile in the presence of partial auxiliary information by empirical likelihood. Some ideal asymptotic properties are obtained. The coverage errors of smoothed empirical likelihood confidence interval for p-quantile is of order n-1. Bartlett-correction could be employed to reduce the order n-2 of magnititude of the coverage error.
散布阵一步 M-估计的渐近性质


系统科学与数学 , 1993,
Abstract: 一、引言与定义对于椭球等高分布散布阵以 A>0和位置参数μ稳健估计已有许多文献讨论过(见 De-vlin,Huber,Maronna,李国英、陈忠琏).鉴于文5]中的 RPP 散布阵构造及对位置0的椭球等高分布 EC_p(0,A)而言,
Casimir Energy in Hartle--Hawking State

FANG Heng-Zhong,ZHU Jian-Yang,

中国物理快报 , 2008,
Abstract: We calculate the Casimir effect at finite temperature in Minkowski spacetime by using statistical method, the approximate expressions of the Casimir effect in the low and high temperature limits are also discussed. Then employing some general properties of the renormalized stress tensor, we obtain the Casimir energy stress tensor in Hartle--Hawking state.
A novel chaotic stream cipher and its application to palmprint template protection

Li Heng-Jian,Zhang Jia-Shu,

中国物理 B , 2010,
Abstract: Based on a coupled nonlinear dynamic filter (NDF), a novel chaotic stream cipher is presented in this paper and employed to protect palmprint templates. The chaotic pseudorandom bit generator (PRBG) based on a coupled NDF, which is constructed in an inverse flow, can generate multiple bits at one iteration and satisfy the security requirement of cipher design. Then, the stream cipher is employed to generate cancelable competitive code palmprint biometrics for template protection. The proposed cancelable palmprint authentication system depends on two factors: the palmprint biometric and the password/token. Therefore, the system provides high-confidence and also protects the user's privacy. The experimental results of verification on the Hong Kong PolyU Palmprint Database show that the proposed approach has a large template re-issuance ability and the equal error rate can achieve 0.02%. The performance of the palmprint template protection scheme proves the good practicability and security of the proposed stream cipher.
Embedding adaptive arithmetic coder in chaos-based cryptography

Li Heng-Jian,Zhang Jia-Shu,

中国物理 B , 2010,
Abstract: In this study an adaptive arithmetic coder is embedded in the Baptista-type chaotic cryptosystem for implementing secure data compression. To build the multiple lookup tables of secure data compression, the phase space of chaos map with a uniform distribution in the search mode is divided non-uniformly according to the dynamic probability estimation of plaintext symbols. As a result, more probable symbols are selected according to the local statistical characters of plaintext and the required number of iterations is small since the more probable symbols have a higher chance to be visited by the chaotic search trajectory. By exploiting non-uniformity in the probabilities under which a number of iteration to be coded takes on its possible values, the compression capability is achieved by adaptive arithmetic code. Therefore, the system offers both compression and security. Compared with original arithmetic coding, simulation results on Calgary Corpus files show that the proposed scheme suffers from a reduction in compression performance less than 12{\%} and is not susceptible to previously carried out attacks on arithmetic coding algorithms.
Role of Endobronchial Ultrasound-guided Transbronchial Needle Aspiration in the Diagnosis of Bronchogenic Carcinoma
Jiayuan SUN,Baohui HAN,Jian ZHANG,Heng ZHAO
Chinese Journal of Lung Cancer , 2010,
Abstract: Background and objective The aim of this study is to evaluate diagnostic yield and the safety of endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) in the diagnosis of bronchogenic carcinoma. Methods Between July, 2009 and February, 2010, 95 patients with mediastinal/hilar lymphadenopathy and/or intrathoracic peritracheal or peribronchial masses previously detected with CT scan underwent EBUS-TBNA. No rapid onsite cytology was performed. Results In all 95 patients, 60 cases were newly diagnosed lung cancer through the pathological examination and clinical follow-up certification. In 60 lung cancer cases, 112 samples were obtained from lymph nodes (LNs) and 11 samples were obtained from intrapulmonary lesions. Fifty-eight cases of patients were diagnosed, false negative in 2 cases. Sensitivity and specificity of EBUS-guided TBNA method in distinguishing benign from malignant LNs or thoracic masses were 96.67% and 100%, respectively. There was any major complication in this series, the procedure was uneventful. Conclusion EBUSTBNA seemed a safe and effective technique in making bronchogenic carcinoma diagnosis for mediastinal/hilar LNs and intrapulmonary masses.
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