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- 저자 : Shan Zhilong (검색결과 3 건)
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Sliding model synchronous control based on RBFN of multiple exciters in vibration system
Zhilong Huang,Lei Shan,Jintao Lai,Jinzhong Wu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
To analyze the synchronization control problems of multiple homodromy exciters in nonlinear vibration system of machinery-material (NVS-MM), nonlinear vibration system dynamics model under excitation of multiple exciters considering the nonlinear support and influence of the material is derived. Aiming at the synchronous control problem of NVSMM, a controller based on radial basis function network global sliding mode control (RBFNGSMC) algorithm and adjacent cross-coupling control (ACCC) strategy is established. Using RBFN to adaptively approximate total uncertainty of NVS-MM can effectively reduce estimation error. Using RBFN method instead of the symbol function can suppress chattering of system and stabilized the response of the system. Performance of the proposed RBFN-GSMC algorithm is further analyzed and verified by numerical simulation. Results show that compared with other control methods, effectiveness of proposed ACCC strategy combined with RBFNGSMC algorithm is verified. ACCC strategy can improve synchronization control accuracy of multiple homodromy exciters in the NVS-MM. Finally, by studying the influence of parameter disturbances in the NVS-MM on the performance of controller, it is proved that proposed controller is robust to external loads or parameter disturbances.
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Wang Zhenzhong,Chen Fangjiong,Yu Hua,Shan Zhilong 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
Underwater Acoustic Channels (UAC) have inherent sparse characteristics. The traditional adaptive equalization techniques do not utilize this feature to improve the performance. In this paper we consider the Variable Adaptive Subgradient Projection (V-ASPM) method to derive a new sparse equalization algorithm based on the Minimum Symbol Error Rate (MSER) criterion. Compared with the original MSER algorithm, our proposed scheme adds sparse matrix to the iterative formula, which can assign independent step-sizes to the equalizer taps. How to obtain such proper sparse matrix is also analyzed. On this basis, the selection scheme of the sparse matrix is obtained by combining the variable step-sizes and equalizer sparsity measure. We call the new algorithm Sparse-Control Proportional-MSER (SC-PMSER) equalizer. Finally, the proposed SC-PMSER equalizer is embedded into a turbo receiver, which perform turbo decoding, Digital Phase-Locked Loop (DPLL), time-reversal receiving and multi-reception diversity. Simulation and real-field experimental results show that the proposed algorithm has better performance in convergence speed and Bit Error Rate (BER).
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Hongzhe Shi,Wen Zhang,Xingang Bi,Dong Wang,Zejun Xiao,Youyan Guan,Kaopeng Guan,Jun Tian,Hongsong Bai,Linjun Hu,Chuanzhen Cao,Weixing Jiang,Zhilong Hu,Jin Zhang,Yan Chen,Shan Zheng,Xiaoli Feng,Changlin 대한암학회 2021 Cancer Research and Treatment Vol.53 No.4
Purpose Reduced quality of life after cystectomy has made bladder preservation a popular research topic for muscle-invasive bladder cancer (MIBC). Previous research has indicated significant tumor downstaging after neoadjuvant chemotherapy (NAC). However, maximal transurethral resection of bladder tumor (TURBT) was performed before NAC to define the pathology, impacting the real evaluation of NAC. This research aimed to assess real NAC efficacy without interference from TURBT and apply combined modality therapies guided by NAC efficacy. Materials and Methods Patients with cT2-4aN0M0 MIBC were confirmed by cystoscopic biopsy and imaging. NAC efficacy was assessed by imaging, urine cytology, and cystoscopy with multidisciplinary team discussion. Definite responders (≤ T1) underwent TURBT plus concurrent chemoradiotherapy. Incomplete responders underwent radical cystectomy or partial cystectomy if feasible. The primary endpoint was the bladder preservation rate. Results Fifty-nine patients were enrolled, and the median age was 63 years. Patients with cT3-4 accounted for 75%. The median number of NAC cycles was three. Definite responders were 52.5%. The complete response (CR) was 10.2%, and 59.3% of patients received bladder-sparing treatments. With a median follow-up of 44.6 months, the 3-year overall survival (OS) was 72.8%. Three-year OS and relapse-free survival were 88.4% and 60.0% in the bladder-sparing group but only 74.3% and 37.5% in the cystectomy group. The evaluations of preserved bladder function were satisfactory. Conclusion After stratifying MIBC patients by NAC efficacy, definite responders achieved a satisfactory bladder-sparing rate, prognosis, and bladder function. The CR rate reflected the real NAC efficacy for MIBC. This therapy is worth verifying through multicenter research.
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