http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Eigenspace-Based Adaptive Multiple Linear Constraint Beamformering
Yu, Jung Lang,Yeh, Chien Chung 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
The generalized eigenspace-based beamformer (GEIB) is presented here which utilizes the eigenstructure of the correlation matrix to enhance the performance of the multiple linear constrained beamformer (MLCB) The weight vector of the GEIB is found by projecting the MLCB weight vector onto a vector subspace constructed from the eigenstructure of the correlation matrix The GEIB and the MLCB have the same responses to the desired signal and the interferers But the GEIB weight vector has a smaller norm and, therefore, generates a lower output noise power By properly constructing the vector subspace, each of the original linear constraints can be preserved or not preserved by the GEIB as desired The cost of preserving a linear constraint is to get more output noise power. Computer simulations are also presented to demonstrate the merits of the GEIB
N-Step Sliding Recursion Formula of Variance and Its Implementation
Lang Yu,Gang He,Ahmad Khwaja Mutahir 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.4
The degree of dispersion of a random variable can be described by the variance, which reflects the distance of the random variable from its mean. However, the time complexity of the traditional variance calculation algorithm is O(n), which results from full calculation of all samples. When the number of samples increases oron the occasion of high speed signal processing, algorithms with O(n) time complexity will cost huge amount of time and that may results in performance degradation of the whole system. A novel multistep recursive algorithm for variance calculation of the timevarying data series with O(1) time complexity (constant time) is proposed in this paper. Numerical simulation and experiments of the algorithm is presented and the results demonstrate that the proposed multistep recursive algorithm can effectively decrease computing time and hence significantly improve the variance calculation efficiency for timevarying data, which demonstrates the potential value for timeconsumption data analysis or high speed signal processing.
Yu Zhang,Xiaxia Yu,Wenjin Zhang,Duoyong Lang,Xiaojia Zhang,Gaochang Cui,Xinhui Zhang 한국식물학회 2019 Journal of Plant Biology Vol.62 No.1
Endophytes are typically non-pathogenic microbesthat at some period in their life cycles colonize the interiorspaces of plant tissues. There is a growing interest in the roleof the endophytes in ameliorating various stresses on plants,including biotic stress (such as pathogenic microbes) andabiotic stress (such as drought and salt stress), becauseendophytes can produce phytohormones, fixing nitrogen,antagonistic substances, enzymes, which plays an importantrole in plants respond to biotic and abiotic stress. Previouslyresearchers have reviewed endophytes promote plant growththrough direct or indirect mechanisms. In order to furtherclarify the interactions between endophytes and it’s hostplants, we reviewed the biological properties of endophytesisolated from different parts of plant, the methods of plantinoculation with endophytes and the beneficial effects ofendophytes to mitigate biotic and abiotic stress in plants.
Zhou, Jue-Yu,He, Li-Wen,Liu, Jie,Yu, Hai-Lang,Wei, Min,Ma, Wen-Li,Shi, Rong Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.21
Background: Excision repair crossing-complementing group 2 (ERCC2), also called xeroderma pigmentosum complementary group D (XPD), plays a crucial role in the nucleotide excision repair (NER) pathway. Previous epidemiological studies have reported associations between ERCC2 polymorphisms and non-Hodgkin lymphoma (NHL) risk, but the results have remained controversial. Materials and Methods: We conducted this meta-analysis based on eligible case-control studies to investigate the role of two ERCC2 polymorphisms (Lys751Gln and Asp312Asn) in determining susceptibility to NHL. Ten case-control studies from several electronic databases were included in our study up to August 14, 2014. Pooled odds ratios (ORs) and 95% confidence intervals (CIs) were calculated using fixed- or random-effects models to estimate the association strength. Results: The combined results based on all studies did not show any association between Lys751Gln/Asp312Asn polymorphisms and NHL risk for all genetic models. Stratified analyses by histological subtype and ethnicity did not indicate any significant association between Lys751Gln polymorphism and NHL risk. However, a significant reduced risk of NHL was found among population-based studies (Lys/Gln versus Lys/Lys: OR=0.87, 95% CI=0.77-0.99, P=0.037) but not hospital-based studies. As for Asp312Asn polymorphism, there was no evidence for the association between this polymorphism and the risk of NHL in all subgroup analyses. Conclusions: This meta-analysis suggests that there may be no association between Lys751Gln/Asp312Asn polymorphism and the risk of NHL and its two subtypes, whereas ERCC2 Lys751Gln heterozygote genotype may provide protective effects against the risk of NHL in population-based studies. Therefore, large-scale and well-designed studies are needed to clarify the effects of haplotypes, gene-gene, and gene-environment interactions on these polymorphisms and the risk of NHL and its different histological subtypes in an ethnicity specific population.
Yu-Qi He,Xin Wang,Lang Yang,Jian Zhang,Qian Kang,Shan Tang,Peng Jin,Jian-Qiu Sheng,Ai-Qin Li 대한소화기내시경학회 2015 Clinical Endoscopy Vol.48 No.5
Background/Aims: Early colorectal (CR) neoplasm can be cured by endoscopic submucosal dissection (ESD), but clinical experience and factors associated with complications from ESD for CR neoplasms in China have not been reported . Methods: Seventy-eight cases of early CR neoplasm treated with endoscopic resection performed between December 2012 and December 2013 at Beijing Military General Hospital were included. Factors associated with ESD complications and procedure times were evaluated. Results: The en bloc resection rate was 88.5% (69/78), tumor size was 32.1±10.7 mm, and procedure time was 71.8±49.5 minutes. The major complication was perforation, which occurred in 8.97% of the ESD procedures. Multivariate logistic regression analysis indicated that only tumor size (p=0.022) was associated with ESD perforation. Tumor size (p<0.001) and the non-lifting sign (p=0.017) were independent factors for procedure time, and procedure time (p=0.016) was a key factor for en bloc resection. After a median 10 months (range, 4 to 16) of follow-up, no patients had local recurrence. Conclusions: This study indicated that ESD is an applicable method for large early CR neoplasm in the colon and rectum. Tumor size and the non-lifting sign might be considerable factors for increased complication rate and procedural time of ESD.