This paper provides a mathematical model for Three Gorges-Gezhou dam co-scheduling problem, based on full analysis of Three Corges-Gezhou dam＇s actual needs, to maximize the total throughput of Three Gorges-Cezhou da...This paper provides a mathematical model for Three Gorges-Gezhou dam co-scheduling problem, based on full analysis of Three Corges-Gezhou dam＇s actual needs, to maximize the total throughput of Three Gorges-Cezhou dam and the utilization ratio of shiplock area and minimize the total navigation shiplock waiting time under multiple constraints. This paper proposes a series queuing network （SQN） scheduling algorithm to divide the total ships that intend to pass through the shiplocks into four queues and calculate dynamically the weight of priority for each ship. The SQN scheduling algorithm schedules ships according to their priority weights which is determined by the characteristics of each ship, such as length, width, affiliation, waiting time, and so on. In the process, the operation conditions of Gezhou dam related to the navigable shiplocks and the task balancing among different shiplocks also should be considered. The SQN algorithm schedules ships circularly and optimizes the results step by step. Real operation data from our project shows that our SQN scheduling algorithm outperforms the traditional manual scheduling in which the less computational time is taken, the area utilization ratio of the five shiplocks is increased, the waiting time of high-prioritized ships is shorten, and a better balanced and alternating run-mode is provided for the three shiplocks in the Gezhou dam.展开更多
1 引言目前,工作站性能大幅度提高,高速网络技术日益成熟,工作站网络(NOW,Network Of Workstations)得到迅猛的发展。但随着网络环境日趋大规模化,传统方式下基于节点的调度方式显然已不能适应,因为随着节点数目的增多不仅管理更加复杂...1 引言目前,工作站性能大幅度提高,高速网络技术日益成熟,工作站网络(NOW,Network Of Workstations)得到迅猛的发展。但随着网络环境日趋大规模化,传统方式下基于节点的调度方式显然已不能适应,因为随着节点数目的增多不仅管理更加复杂,而且系统开销也将增加很多,所以我们提出层次调度方式。展开更多
在研究多种J2EE Web框架和J2EE核心模式的基础上,提出了一种基于J2EE核心模式的组合Web框架——CWFBP(Composite Web Framework based on core J2EE Patterns)模型.框架采用分层体系架构,集成了开源的J2EE Web框架和持久层框架,并在表...在研究多种J2EE Web框架和J2EE核心模式的基础上,提出了一种基于J2EE核心模式的组合Web框架——CWFBP(Composite Web Framework based on core J2EE Patterns)模型.框架采用分层体系架构,集成了开源的J2EE Web框架和持久层框架,并在表示层和业务层综合应用多种J2EE核心模式,实现了层次之间和业务层内部的松散耦合,提高了系统的可复用性和开放性.研究了N层计算模式、AJAX和正则表达式等在模型中的应用.采用CWFBP进行软件架构,设计实现了三峡——葛洲坝水利枢纽通航调度系统.系统运行实践表明了CWFBP的正确性和有效性.展开更多
基金supported by the National Natural Science Foundation of China under Grant No. 60904074the Natural Science Foundation of Hubei Province of China under Grant No. 2008CDB012the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No. 200804871150
文摘This paper provides a mathematical model for Three Gorges-Gezhou dam co-scheduling problem, based on full analysis of Three Corges-Gezhou dam＇s actual needs, to maximize the total throughput of Three Gorges-Cezhou dam and the utilization ratio of shiplock area and minimize the total navigation shiplock waiting time under multiple constraints. This paper proposes a series queuing network （SQN） scheduling algorithm to divide the total ships that intend to pass through the shiplocks into four queues and calculate dynamically the weight of priority for each ship. The SQN scheduling algorithm schedules ships according to their priority weights which is determined by the characteristics of each ship, such as length, width, affiliation, waiting time, and so on. In the process, the operation conditions of Gezhou dam related to the navigable shiplocks and the task balancing among different shiplocks also should be considered. The SQN algorithm schedules ships circularly and optimizes the results step by step. Real operation data from our project shows that our SQN scheduling algorithm outperforms the traditional manual scheduling in which the less computational time is taken, the area utilization ratio of the five shiplocks is increased, the waiting time of high-prioritized ships is shorten, and a better balanced and alternating run-mode is provided for the three shiplocks in the Gezhou dam.
文摘1 引言目前,工作站性能大幅度提高,高速网络技术日益成熟,工作站网络(NOW,Network Of Workstations)得到迅猛的发展。但随着网络环境日趋大规模化,传统方式下基于节点的调度方式显然已不能适应,因为随着节点数目的增多不仅管理更加复杂,而且系统开销也将增加很多,所以我们提出层次调度方式。
文摘在研究多种J2EE Web框架和J2EE核心模式的基础上,提出了一种基于J2EE核心模式的组合Web框架——CWFBP(Composite Web Framework based on core J2EE Patterns)模型.框架采用分层体系架构,集成了开源的J2EE Web框架和持久层框架,并在表示层和业务层综合应用多种J2EE核心模式,实现了层次之间和业务层内部的松散耦合,提高了系统的可复用性和开放性.研究了N层计算模式、AJAX和正则表达式等在模型中的应用.采用CWFBP进行软件架构,设计实现了三峡——葛洲坝水利枢纽通航调度系统.系统运行实践表明了CWFBP的正确性和有效性.
