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- 저자 : Zhenghua Ma (검색결과 2 건)
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Suolin Duan,Yonghong Wu,Zhenghua Ma,Guirong Lu 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper a discrete closed-loop D-type iterative learning control (ILC) scheme for the electrohydraulic position servo systems with parameter uncertainties is presented. The conditions which guarantee the convergence of the algorithm are given and the convergence is proved. The simulation results demonstrate the effectiveness of the presented D-type ILC algorithm for the discretization electrohydraulic position servo systems with parameter uncertainties.
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Evaluation of Neck Lymph Node Metastasis on Contrast-Enhanced Ultrasound: An Animal Study
Zheng Cui,Yi Gao,Weihua Wang,Zhenghua Zhu,Zhaoxin Ma 대한이비인후과학회 2017 Clinical and Experimental Otorhinolaryngology Vol.10 No.1
Objectives. To assess the performance of contrast-enhanced ultrasound (CEUS) intended to differentiate hyperplastic from malignant neck lymph nodes in an animal model. Methods. Twenty-four New Zealand rabbits were randomly divided into two groups: neck lymph node metastasis group (12 rabbits) and reactive hyperplastic lymph node group (12 rabbits). Tongue VX2 carcinoma with cervical lymph node metastasis was induced in 12 rabbits by injecting VX2 carcinoma suspension into the left tongue submucosa. Hyperplastic neck lymph nodes were induced by injecting egg yolk in the submandibular region of the rabbits in hyperplastic group. CEUS were performed in both groups before and after intravenous administration of SonoVue. The site, number, echogenicity, longitudinal and transverse nodal dimensions, patterns of enhancement of the neck lymph nodes were observed and recorded. Results. In both groups only one lymph node was found in the left (tumor) side of the neck. CEUS found 12 of 12 metastatic lymph nodes in metastasis group, and diagnosed 11 of 12 lymph nodes as metastatic. Histopathologic analysis revealed metastatic lesions in all 12 rabbits, each with one lymph node, and all 12 lymph nodes in hyperplastic group is inflammation lymph nodes. All 12 cases in the hyperplastic group showed centripetal homogeneous enhancement while in the metastasis group one case showed centripetal homogeneous enhancement, three cases showed centrifugal heterogeneous enhancement, and eight cases showed diffused heterogeneous enhancement. Only one lymph node was dissected on the left side of the neck in each rabbit in both groups. Conclusion. CEUS can play a role in discriminating metastatic from hyperplastic lymph nodes in head and neck carcinoma.
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