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Comparison of postoperative complications between internal and external pancreatic duct stenting during pancreaticoduodenectomy: a meta-analysis

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Chinese Journal of Cancer Research 2015年第4期27卷 397-407页

作者： Fa-Yong Ke Xiang-Song Wu Yong Zhang Hong-Cheng Zhang ming-zhe weng Ying-Bin Liu Christopher Wolfgang Wei Gong Department of General Surgery Xinhua Hospital Shanghai Jiao Tong University School of Medicine Department of Hepatobiliary and Pancreatic Surgery Johns Hopkins School of Medicine

Background：Two types of pancreatic duct stents are used to improve postoperative outcomes of pancreatic *** aim of this meta-analysis was to evaluate and compare the postoperative outcomes of patients with internal or external stenting during pancreaticoduodenectomy（PD）.Methods：We searched Pub Med,EMBASE,the Cochrane Library and Web of Science databases until the end of December,*** comparing outcomes of external *** stent placement in PD were eligible for *** literature was extracted and assessed by two independent ***：Seven articles were identified for inclusion：three randomized controlled trials（RCTs）and four observational clinical studies（OCS）.The meta-analyses revealed that use of external stents had advantage on reducing the incidences of pancreatic fistula（PF）in total[odds ratio（OR）=0.69;95%confidence interval（CI）,0.48-0.99;P=0.04],PF in soft pancreas（OR=0.30;95%CI,0.16-0.56;P=0.0002）and delayed gastric emptying（DGE）（OR=0.58;95%CI,0.38-0.89;P=0.01）compared with internal *** were no significant differences in other postoperative outcomes between two stenting methods,including postoperative morbidity（OR=0.93;95%CI,0.39-2.23;P=0.88）,overall mortality（OR=0.70;95%CI,0.22-2.25;P=0.55）,and intra-abdominal collections（OR=0.67;95%CI,0.26-1.71;P=0.40）.Conclusions：Based upon this meta-analysis,the use of external pancreatic stents might have potential benefit in reducing the incidence of PF and *** to the limited number of original studies,more RCTs are needed to further support our result and clarify the issue.

关键词： Pancreatic duct stent pancreaticoduodenectomy(PD) meta-analysis

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ZBTB20 is involved in liver regeneration after partial hepatectomy in mouse

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Hepatobiliary & Pancreatic Diseases International 2014年第1期13卷 48-54页

作者： ming-zhe weng Peng-Yuan Zhuang zhen-Yu Hei Pei-Yi Lin Zhi-Sheng Chen Ying-Bin Liu Zhi-Wei Quan Zhao-Hui Tang Department of General Surgery Xinhua Hospital Shanghai Jiaotong University School of Medicine

BACKGROUND: A better understanding of the molecular mechanisms in liver regeneration holds promise for exploring the new potential therapy for liver failure. The present study was to investigate the role of zinc finger and BTB domain-containing protein 20(ZBTB20), a potential factor associated with liver regeneration, in a model of 70% hepatectomy in mice. METHODS: Parameters for liver proliferation such as liver/body ratio and BrdU positivity were obtained via direct measurement and immunohistochemistry. The levels of zinc fingers and homeoboxes 2(ZHX2), ZBTB20, alpha-fetoprotein(AFP) and glypican 3(GPC3) transcripts in the regenerating liver tissue of a 70% hepatectomy rodent model were monitored by real-time PCR analysis at different time points. Knockdown of ZBTB20 was performed to characterize its regulatory function. RESULTS: A negatively regulating relationship between ZHX2, ZBTB20 and AFP, GPC3 was revealed from 24 to 72 hours after 70% hepatectomy. ZBTB20 appears to negatively regulate AFP and GPC3 transcription since the knockdown of ZBTB20 promoted the proliferation of hepatocytes and the expression of AFP and GPC3. CONCLUSION: In addition to AFP, GPC3 and ZHX2, ZBTB20 is a new regulator in liver regeneration and the decrease of ZBTB20 expression following 70% hepatectomy promotes AFP and GPC3 expression.

关键词： partial hepatectomy liver regeneration ZBTB20 mouse

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A DYNAMIC ALLOCATION MODEL FOR MEDICAL RESOURCES IN THE CONTROL OF INFLUENZA DIFFUSION

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Journal of Systems Science and Systems Engineering 2015年第3期24卷 276-292页

作者： ming Liu zhe Zhang Ding Zhang Department of Management Science and Engineering Nanjing University of Science and Technology School of Business State University of New York

In this paper, we develop a unique time-varying forecasting model for dynamic demand of medical resources based on a susceptible-exposed-infected-recovered （SEIR） influenza diffusion model. In this forecasting mechanism, medical resources allocated in the early period will take effect in subduing the spread of influenza and thus impact the demand in the later period. We adopt a discrete time-space network to describe the medical resources allocation process following a hypothetical influenza outbreak in a region. The entire medical resources allocation process is constructed as a multi-stage integer programming problem. At each stage, we solve a cost minimization sub-problem subject to the time-varying demand. The corresponding optimal allocation result is then used as an input to the control process of influenza spread, which in turn determines the demand for the next stage. In addition, we present a comparison between the proposed model and an empirical model. Our results could help decision makers prepare for a pandemic, including how to allocate limited resources dynamically.

关键词： Time-varying demand medical resources influenza diffusion time-space network

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Optimal Design of Two Road Networks Based on their Properties

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Acta Mathematicae Applicatae Sinica 2007年第2期23卷 337-352页

作者： ming-zhe Li Yan Zhang Faculty of Economics Fukuoka University 8-19-1 Nanakuma Jonan-ku Fukuoka 814-0180 Japan

In this paper, we discuss some fundamental properties of two idealized typical networks, namely, grid type and radial-circular type. The discussion is based on SPCP （Shortest Path Counting Problem）, which reflects the traffic density of a road segment. Furthermore, we compare their effectiveness based on the obtained results of the above two road networks, and suggest some proposals on the design of car lanes by considering the direction of a road segment in relation to these road networks.

关键词： SPCP DSPCP grid radial-circular optimal design of road networks

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Influence of a multi-step process on the thickness reduction error of sheet metal in a flexible rolling process

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International Journal of Minerals,Metallurgy and Materials 2019年第1期26卷 76-85页

作者： Yi Li ming-zhe Li Kai Liu Dieless Forming Technology Center Roll Forging Institute Jilin University College of Materials Science and Engineering Jilin University

Flexible rolling is a forming process based on thickness reduction, and the precision of thickness reduction is the key factor affecting bending deformation. The major purpose of the present work is to solve the problem of bending deformation error caused by insufficient thickness reduction. Under the condition of different rolling reductions with the same sheet thickness and the same thickness reduction with different sheet thicknesses, the thickness reduction error of sheet metal is analyzed. In addition, the bending deformation of sheet metal under the same conditions is discussed and the influence of the multi-step forming process on the thickness reduction error is studied. The results show that, under the condition of the same sheet thickness, the thickness reduction error increases with increasing rolling reduction because of an increase in work hardening. As rolling reduction increases, the longitudinal bending deformation decreases because of the decrease of the maximum thickness difference. Under the condition with the same thickness reduction, the thickness reduction error increases because of the decrease of the rolling force with increasing sheet thickness. As the sheet thickness increases, the longitudinal bending deformation increases because of the increase in the maximum thickness difference. A larger bending deformation is divided into a number of small bending deformations in a multi-step forming process, avoiding a sharp increase in the degree of work hardening; the thickness reduction error is effectively reduced in the multi-step forming process. Numerical simulation results agree with the results of the forming experiments.

关键词： flexible rolling convex surface numerical simulation thickness reduction error multi-step forming process

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Differential Scanning Calorimetry of Ferro elec trie Liquid Crystal MBOPDOB Near Phase Transitions

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Chinese Physics Letters 1993年第11期10卷 673-675页

作者： YIN zhe ZHANG ming-sheng Department of Physics Center for Materials Analysis and National Laboratory of Solid State Microstructuresf Nanjing UniversityNanjing 210008 不详

Differential scanning calorimetric results of ferroelectric liquid crystal D-4-(2-methylbutoxy)phenyl 4-decyloxybenzoate(MBOPDOB)were *** overcooling of Sm C^(*) phase in the sample promotes the ordering of the molecul&r orienta^*** heat of the Sm A-Sm C^(*) transition manifests a continuous second-order nature of the transition which is attributed to a large temperature range of the Sm A phase and a small spontaneous polarization.A model structure concerning the small polarization is also discussed.

关键词： Transition MBO transition

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Can molecular ferroelectrics challenge pure inorganic ones?

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National Science Review 2014年第1期1卷 25-26页

作者： zhe-ming Wang Song Gao Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University

Molecular materials have atracted much atention due to their advantages of easy modiication and fabrication,environmentally friendly and less energy-cost processing,transparent,light weight,mechanical lexibility and possible multi-functionalities,compared to their counter parts of pure inorganic or metallic ones,and many functionalities and properties have been discovered and realized in molecule-based materials[1–4].Ferroelectrics,as an important class of multifunctional

关键词： Can molecular ferroelectrics challenge pure inorganic ones high BTO

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Improving effect on forming quality and accuracy using a polyurethane board positioning/resetting the discrete steel pad in multi-point forming

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 447-459页

作者： Er-hu Qu ming-zhe Li Rui Li College of Materials Science and Engineering Jilin University Roll Forging Institute Jilin University Changchun Ruiguang Technology Co. Ltd.

To improve the quality of multi-point die forming, a new approach using discrete steel pads was proposed. The formability of three different multi-point die forming processes was analyzed through numerical simulation and experiments. Numerical simulation and experimental results showed that the use of discrete steel pads in the multi-point forming process can substantially improve the stress–strain state on the plate and suppress dimple, straight-edge, and wrinkle defects. This analysis verified that the use of discrete steel pads in a multi-point forming process can effectively improve the quality and accuracy with which sheet metal is formed.

关键词： multi-point forming dimple wrinkle numerical simulation forming accuracy

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Wavelet network based predistortion method for wideband RF power amplifiers exhibiting memory effects

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Journal of zhejiang University-Science A(Applied Physics & Engineering) 2007年第4期8卷 625-630页

作者： JIN zhe SONG Zhi-huan HE Jia-ming School of Information Science and Engineering Zhejiang University Hangzhou 310027 China Institute of Communication Technologies Ningbo University Ningbo 315211 China

RF power amplifiers (PAs) are usually considered as memoryless devices in most existing predistortion techniques. Nevertheless, in wideband communication systems, PA memory effects can no longer be ignored and memoryless predistortion cannot linearize PAs effectively. After analyzing PA memory effects, a novel predistortion method based on wavelet networks (WNs) is proposed to linearize wideband RF power amplifiers. A complex wavelet network with tapped delay lines is applied to construct the predistorter and then a complex backpropagation algorithm is developed to train the predistorter parameters. The simulation results show that compared with the previously published feed-forward neural network predistortion method, the proposed method provides faster convergence rate and better performance in reducing out-of-band spectral regrowth.

关键词： Power amplifiers. Predistortion. Memory effects. Wavelet networks

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Optimization of Preventive Grinding of Backup Roll against Contact Fatigue Cracking

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Journal of Iron and Steel Research International 2005年第3期12卷 28-33,45页

作者： DOUPeng LIYou-guo LIANGKai-ming BAIBing-zhe TsinghuaUniversity Beijing100084China

In order to optimize the current grinding procedure of the backup roll of 2050 continuously variable crown (CVC) mills, the behavior of rolling contact fatigue (RCF) cracking was investigated. Two RCF short cracks, including vertical short crack and ratcheting short crack initiated from ratcheting, were observed. The behavior of both RCF cracks was analyzed in detail. Then a modified grinding procedure was proposed according to the behavior of RCF cracks and the preventive grinding strategy.

关键词： rolling contact fatigue short crack vertical short crack ratcheting short crack 2050 CVC hot rolling mill preventive grinding

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