This paper presents an algorithm for solving Bi-criteria Minimum Cost Dynamic Flow (BiCMCDF) problem with continuous flow variables. The approach is to transform a bi-criteria problem into a parametric one by building...This paper presents an algorithm for solving Bi-criteria Minimum Cost Dynamic Flow (BiCMCDF) problem with continuous flow variables. The approach is to transform a bi-criteria problem into a parametric one by building a single parametric linear cost out of the two initial cost functions. The algorithm consecutively finds efficient extreme points in the decision space by solving a series of minimum parametric cost flow problems with different objective functions. On each of the iterations, the flow is augmented along a cheapest path from the source node to the sink node in the time-space network avoiding the explicit time expansion of the network.展开更多
This paper proposed a bi-criteria weighting approach for fault tolerant control(FTC)of SY-II remote operated vehicle(ROV).This approach integrates the minimum kinetic energy(2-norm optimal)approach with the infinity-n...This paper proposed a bi-criteria weighting approach for fault tolerant control(FTC)of SY-II remote operated vehicle(ROV).This approach integrates the minimum kinetic energy(2-norm optimal)approach with the infinity-norm approach through a weighting coefcient,on the basis of SY-II ROV force allocation model.For the realization of fault tolerable control,this approach converts a quadratic programming problem into primaldual neural network.From the motion control simulations and experiments,bi-criteria optimization approach outperforms minimum kinetic energy optimization in FTC,SY-II ROV can realize 2-degree of freedom(DOF)horizontal fault tolerant control with one main thruster and any of horizontal ones.Therefore,this scheme is proved to be of superiority and computational efciency,both the reliability and safety for ROV have been improved.展开更多
目的:探讨分析B I-R A D S分级诊断标准在乳腺高频彩色多普勒超声检查中的应用及临床推广价值。方法:回顾分析我院2014年11月—2016年11月收治的行乳腺高频彩色多普勒超声检查的乳腺疾病患者73例,在检查中运用BI-RADS分级诊断标准,根据...目的:探讨分析B I-R A D S分级诊断标准在乳腺高频彩色多普勒超声检查中的应用及临床推广价值。方法:回顾分析我院2014年11月—2016年11月收治的行乳腺高频彩色多普勒超声检查的乳腺疾病患者73例,在检查中运用BI-RADS分级诊断标准,根据诊断数据与最终的病理诊断结果比较。结果:85个病灶中,BI-RADS3级诊断出35个,组织病理学证实良性、恶性26:9;BI-RADS4级诊断出31个,组织病理学证实良性、恶性5:26;BI-RADS5级诊断出23个,组织病理学证实良性、恶性0:23。结论:BI-RADS分级诊断标准应用于高频彩色多普勒超声诊断检查中具有临床推广价值,对于乳腺病灶的检查以及肿瘤良性和恶性的分级评价方面,将会变得更加精准,有助于做好患者的早期治疗。展开更多
文摘This paper presents an algorithm for solving Bi-criteria Minimum Cost Dynamic Flow (BiCMCDF) problem with continuous flow variables. The approach is to transform a bi-criteria problem into a parametric one by building a single parametric linear cost out of the two initial cost functions. The algorithm consecutively finds efficient extreme points in the decision space by solving a series of minimum parametric cost flow problems with different objective functions. On each of the iterations, the flow is augmented along a cheapest path from the source node to the sink node in the time-space network avoiding the explicit time expansion of the network.
基金the National Natural Science Foundation of China(Nos.51279039 and 1209050)the Harbin Special Funds for Technological Innovation Research(No.2013RFQXJ117)the Technology Programof Educational Department of Heilongjiang Province(No.11553065)
文摘This paper proposed a bi-criteria weighting approach for fault tolerant control(FTC)of SY-II remote operated vehicle(ROV).This approach integrates the minimum kinetic energy(2-norm optimal)approach with the infinity-norm approach through a weighting coefcient,on the basis of SY-II ROV force allocation model.For the realization of fault tolerable control,this approach converts a quadratic programming problem into primaldual neural network.From the motion control simulations and experiments,bi-criteria optimization approach outperforms minimum kinetic energy optimization in FTC,SY-II ROV can realize 2-degree of freedom(DOF)horizontal fault tolerant control with one main thruster and any of horizontal ones.Therefore,this scheme is proved to be of superiority and computational efciency,both the reliability and safety for ROV have been improved.
文摘目的:探讨分析B I-R A D S分级诊断标准在乳腺高频彩色多普勒超声检查中的应用及临床推广价值。方法:回顾分析我院2014年11月—2016年11月收治的行乳腺高频彩色多普勒超声检查的乳腺疾病患者73例,在检查中运用BI-RADS分级诊断标准,根据诊断数据与最终的病理诊断结果比较。结果:85个病灶中,BI-RADS3级诊断出35个,组织病理学证实良性、恶性26:9;BI-RADS4级诊断出31个,组织病理学证实良性、恶性5:26;BI-RADS5级诊断出23个,组织病理学证实良性、恶性0:23。结论:BI-RADS分级诊断标准应用于高频彩色多普勒超声诊断检查中具有临床推广价值,对于乳腺病灶的检查以及肿瘤良性和恶性的分级评价方面,将会变得更加精准,有助于做好患者的早期治疗。
