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24 results on '"Zeng, Zhi-Bin"'

11. The compression LS estimate of regression coefficient in multivariate linear model

Author

Zeng Zhi-bin and Chen Shi-ji

Subjects
Combinatorics, Mean squared error, Mechanics of Materials, Applied Mathematics, Mechanical Engineering, Compression (functional analysis), Linear regression, Statistics, Design matrix, Multivariate linear model, Numerical stability, Mathematics
Abstract

In this paper, compression LS estimate $$\hat B\left( k \right)$$ of the regression coefficient B is considered when the design matrix present ill-condition in multivariate linear model. The MSE (mean square error) of the estimate $$\hat \beta \left( k \right) = Vec\left( {\hat B\left( k \right)} \right)$$ is less than the MSE of LS estimate β* of the regression coefficient β=Vec(B) by choosing the parameter k. Admissibility, numerical stability and relative efficiency of $$\hat B\left( k \right)$$ are proved. The method of determining k value for practical use is also suggested.

Published
1994

12. Generalized multivariate ridge regression estimate and criteria q(c) for choosing matrixK

Author

Chen Shi-ji and Zeng Zhi-bin

Subjects
Polynomial regression, Variance inflation factor, Statistics::Theory, Proper linear model, Applied Mathematics, Mechanical Engineering, Local regression, Regression analysis, Statistics::Computation, Statistics::Machine Learning, Mechanics of Materials, Multicollinearity, Statistics, Statistics::Methodology, Principal component regression, Segmented regression, Mathematics
Abstract

When multicollinearity is present in a set of the regression variables, the least square estimate of the regression coefficient tends to be unstable and it may lead to erroneous inference.

Published
1993

22. [Analysis of effects of arthroscopic treatment for recurrent patellar dislocation by lateral patellar retinacular release outside the synovial bursa of knee joint combined with reconstruction of medial patellofemoral ligament].

Author

Li B, Tan JY, Zeng ZB, Zhan TJ, and Chen HQ

Subjects
Adolescent, Adult, Arthroscopy, Female, Humans, Male, Patellar Dislocation physiopathology, Range of Motion, Articular, Treatment Outcome, Young Adult, Bursa, Synovial surgery, Knee Joint surgery, Patellar Dislocation surgery, Patellar Ligament surgery
Abstract

Objective: To introduce an arthroscopic technique in managing recurrent dislocation of the patella and its clinical results., Methods: Sixteen patients with recurrent patellar dislocation were reviewed, including 3 males and 13 females. The average age was 17.6 years old (ranged from 14 to 32 years). The patients suffering from patellar sub-luxation averaged 18.5 months (ranged from 6 to 23 months)before operation. These patients were treated with lateral patellar retinacular release outside the synovial bursa of knee joint and medial patellofemoral ligament reconstruction using the semitendinosus tendon free autograft. The Lyshohm scores before and after operation were used to evaluate outcomes at the final follow-up., Results: All the patients were followed up, and the duration ranged from 6 to 48 months, with an average of 12 months. There was no recurrence. The Q angle decreased from (16.4 ± 3.7)° to (10.1 ± 1.4)°; insall index decreased from 1.37 ± 0.25 to 1.28 ± 0.23; congruence angle decreased from (21.3 ± 2.6)° to (5.86 ± 2.23)°; Lysholm score improved from 76.1 ± 5.2 to 89.8 ± 4.1 at 6 months after operation., Conclusion: Compared with conventional procedure, arthroscopic surgery for recurrent dislocation of the patella achieves excellent outcomes with minimum invasion.

Published
2015

23. [Diagnosis of spontaneous isolated superior mesenteric artery dissection using computed tomography angiography].

Author

Peng KW, Shen BX, Gao Y, Zeng ZB, Wang CR, and Xiao P

Subjects
Adult, Aged, Aged, 80 and over, Female, Humans, Male, Middle Aged, Retrospective Studies, Tomography, X-Ray Computed, Young Adult, Aortic Dissection diagnostic imaging, Angiography methods, Mesenteric Artery, Superior diagnostic imaging
Abstract

Objective: To investigate the characteristics of the spontaneous isolated superior mesenteric artery dissection (SISMAD) on computed tomography angiography (CTA)., Methods: Twenty-five patients with unexplained acute abdominal pain received CTA., Results: Four cases with the SISMAD were found and all were male with a mean age of (45.3±6.7) years. Two patients had hypertension history. CT showed enlarged diameter of the superior mesenteric artery with dissection in 4 cases, intimal flap and visible false lumen in 2 cases, ulcer-like laceration in 1 case, and intramural hematoma in 1 case. The proximal lacerations or entries were all at the proximal segment of the superior mesenteric artery. CTA classifications were type Ia (n=2), IIb (n=1), and III (n=1). Two patients underwent repeated CTA when discharged, and progressive changes were discovered., Conclusion: CTA can clearly show the characteristics of the superior mesenteric artery dissection, confirm the diagnosis, and provide an important basis for the classification and follow-up observation.

Published
2012

24. [Preparation and characterization of herba pogostemonis, rhizoma atractylodis and radix aucklandiae compound essential oil-beta-cyclodextrin complex].

Author

Huang H, Du F, Zeng ZB, Ye JW, and Du S

Subjects
Asteraceae chemistry, Atractylodes chemistry, Chromatography, Thin Layer, Colloids, Drug Carriers, Drug Stability, Drugs, Chinese Herbal isolation & purification, Lamiaceae chemistry, Oils, Volatile analysis, Oils, Volatile isolation & purification, Temperature, X-Ray Diffraction, Plants, Medicinal chemistry, Technology, Pharmaceutical methods, beta-Cyclodextrins
Abstract

Objective: To prepare and characterize Herba pogostemonis, Rhizoma atractylodis and Radix aucklandiae compound essential oil-beta-cyclodextrin complex., Methods: The essential oil-p3-cyclodextrin complex was prepared by colloidal mill method. TLC, XRD, DSC and TGA analysis were applied to characterize it., Results: The complex inclusion rate of essential oil-beta-CD complex was 82.4%, and the complex recovery was 80.7%. The formation of essential oil-beta-CD complex was proved by the results of TLC, XRD, DSC, TGA analysis., Conclusion: The stability of compound essential oil is improved by the preparation of oil beta-cyclodextrin complex.

Published
2008

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