A novel space-borne antenna nulling method is presented on rejecting strong multi-interference from the ground and air. Immune Genetic Algorithm for searching for the multi-extremum of maximum likelihood function has ...A novel space-borne antenna nulling method is presented on rejecting strong multi-interference from the ground and air. Immune Genetic Algorithm for searching for the multi-extremum of maximum likelihood function has been developed, which is based on injecting vaccine pick-up adaptively. GA has the capability of the whole searching and is not limited by the selection of initial parameter. And the Immune algorithm possesses the advantage of availing oneself of characteristic information. The proposed method, combining GA with the Immune algorithm, can converge at the global optimum quickly and offer high resolution null point. Simulation examples, based on the spot survey data, are shown to illustrate the effectiveness and robustness of the proposed algorithm.展开更多
As the Projection Approximation Subspace Tracking with deflation(PASTd) algorithm is sensitive to impulsive noise, an improved subspace tracking algorithm is proposed and applied to blind adaptive multi-user detection...As the Projection Approximation Subspace Tracking with deflation(PASTd) algorithm is sensitive to impulsive noise, an improved subspace tracking algorithm is proposed and applied to blind adaptive multi-user detection. Simulation results show that the improved PASTd algorithm not only remains the properties of the conventional PASTdalgorithm, but also has good Bit Error Rate(BER) performance in impulsive noise environment, thus it can effectively improve the system performance.展开更多
Objective: To study the relationship between signal regulatory protein az (SIRPα1) and hep-atocellular carcinoma (HCC) and explore the possible molecular mechanisms. Methods: Total RNA was extracted from normal hepat...Objective: To study the relationship between signal regulatory protein az (SIRPα1) and hep-atocellular carcinoma (HCC) and explore the possible molecular mechanisms. Methods: Total RNA was extracted from normal hepatocyte cell line Hs680, Hepatocellular carcinoma cell lines HepG2, H4-H7,Chang liver and SK-Hepl. The SIRPα1 expression was determined by Northern blot. The mRNA and protein expression of SIRPα1 was detected in 42 pathologically confirmed hepatocellular carcinoma tissue samples and 6 normal liver tissues by Northern blot and immunohistochemical staining. The association of SIRPα1 and HGF was determined in HUH7. Results: SIRPα1 was highly expressed in Hs680, HepG2 and H4-H7, but weakly expressed in SK-Hepl and Chang liver cell lines. Northern blot and Western blot both detected the reduced expression of SIRPα1 in hepatocellular carcinoma tissue as compare to paracancerous and normal tissues. In vitro experiments showed HGF stimulation elevated SIRPα1 phosphorylation. Over-expression of wild type SIRPα1 promoted cell proliferation in the presence of HGF. Conclusion: SIRPα1 might be involved in HCC development and metastasis. The underlying mechanisms may be related to regulatory tyrosine phosphorylation of SIRPα1 by HGF stimulation.展开更多
文摘A novel space-borne antenna nulling method is presented on rejecting strong multi-interference from the ground and air. Immune Genetic Algorithm for searching for the multi-extremum of maximum likelihood function has been developed, which is based on injecting vaccine pick-up adaptively. GA has the capability of the whole searching and is not limited by the selection of initial parameter. And the Immune algorithm possesses the advantage of availing oneself of characteristic information. The proposed method, combining GA with the Immune algorithm, can converge at the global optimum quickly and offer high resolution null point. Simulation examples, based on the spot survey data, are shown to illustrate the effectiveness and robustness of the proposed algorithm.
文摘As the Projection Approximation Subspace Tracking with deflation(PASTd) algorithm is sensitive to impulsive noise, an improved subspace tracking algorithm is proposed and applied to blind adaptive multi-user detection. Simulation results show that the improved PASTd algorithm not only remains the properties of the conventional PASTdalgorithm, but also has good Bit Error Rate(BER) performance in impulsive noise environment, thus it can effectively improve the system performance.
文摘Objective: To study the relationship between signal regulatory protein az (SIRPα1) and hep-atocellular carcinoma (HCC) and explore the possible molecular mechanisms. Methods: Total RNA was extracted from normal hepatocyte cell line Hs680, Hepatocellular carcinoma cell lines HepG2, H4-H7,Chang liver and SK-Hepl. The SIRPα1 expression was determined by Northern blot. The mRNA and protein expression of SIRPα1 was detected in 42 pathologically confirmed hepatocellular carcinoma tissue samples and 6 normal liver tissues by Northern blot and immunohistochemical staining. The association of SIRPα1 and HGF was determined in HUH7. Results: SIRPα1 was highly expressed in Hs680, HepG2 and H4-H7, but weakly expressed in SK-Hepl and Chang liver cell lines. Northern blot and Western blot both detected the reduced expression of SIRPα1 in hepatocellular carcinoma tissue as compare to paracancerous and normal tissues. In vitro experiments showed HGF stimulation elevated SIRPα1 phosphorylation. Over-expression of wild type SIRPα1 promoted cell proliferation in the presence of HGF. Conclusion: SIRPα1 might be involved in HCC development and metastasis. The underlying mechanisms may be related to regulatory tyrosine phosphorylation of SIRPα1 by HGF stimulation.
