基于kd-树的快速邻域分类方法

有关邻域粗糙集中信息粒化的研究大多以提升邻域分类准确率为目的,往往忽略了高效的邻域搜索策略对提升邻域分类方法时间效率的重要现实意义.为解决该问题,文中借助kd-树型邻域搜索策略,提出了一种基于kd-树的快速邻域分类方法 kdtree-NC,该方法在特征选择与邻域分类两阶段的信息粒化过程中,均采用kd-树搜索策略代替传统邻域分类方法 NC中的线性遍历搜索,很大程度上降低了NC处理大规模数据的时间消耗.在18组UCI数据集上的实验结果表明,与NC方法相比,kdtree-NC方法在特征选择和邻域分类上的时间效率都有显著提升.     

港口煤炭堆场优化使用问题初探

分析了秦皇同港煤炭堆的使用状况，并用系统工程的观点，对煤炭堆场优化使用提出了具体建议 。     

专业化汽车卸车技术在大型煤炭码头的应用

结合徐州港徐州港区顺堤河作业区煤炭码头一期工程实例,研究专业化汽车卸车技术在大型煤炭港口的应用,为专业化汽车卸车系统的设计、制造、安装、生产运营、管理调度和维护提供技术支持和理论依据。通过调研分析、专家咨询,经工艺方案比选和设备选型优化等,提出适合工程实际需求的专业化汽车卸车技术方案,提高了汽车卸车工艺布置的适应性和可靠性。     

煤炭堆场布置形式研究

以镇江港高资港区华电句容煤炭储运码头工程堆场布置为例,对各种煤炭堆场布置形式进行分析比较,着重考虑安全生产和环境保护两个因素,探讨长江中下游码头煤炭堆场建设的结构形式.     

决策技术在邳州港^#6煤码头装卸工艺方案设计中的应用

决策技术是一种系统搜索的现代工程设计方法之一，采用数学模型，优化方法来预测经济效益，选择最佳工艺方案，文章以邳州港＾＃６煤码头装卸工艺设计为例，介绍决策技术在优选工艺方案中的应用。     

决策技术在优选装卸工艺方案中的应用

决策技术是一种系统搜索的现代化设计方法之一,采用数学模型,优化方法来预测经济效益,选择最佳工艺方案,文章以邳州港#7煤港扩建工程装卸工艺设计为例,介绍决策技术在优选工艺方案中的应用。     

现代煤炭港口卸车联合调度优化问题研究

现代煤炭港口由传统装卸服务向综合物流服务转型过程中,对港口整体调度的智能性与效率性要求提升到新高度,因此需要以系统论的观点解决煤炭港口的联合调度优化问题。针对影响卸车调度的关键问题,综合考虑车流集中到达、列车限制性调度等因素,以现代煤炭港口生产工艺流程为基础,重点研究现代煤炭港口卸车联合调度优化,构建以待车时间最短、作业时间最短且关联堆场作业动态的卸车联合调度优化模型(火车-翻车机-堆场联合调度优化模型),运用相应优化策略,分析优化模型,实现卸车调度各环节智能化的最优解决途径。     

基于排队论的煤炭翻车机卸车系统效率研究

为提升国内港口的服务水平，提高港口卸车系统效率，通过分析影响卸车效率的因素和卸车作业环节的时间组成，建立M／M／S排队模型用以衡量煤炭卸车系统作业效率，并结合实例说明该模型对港口卸车效率的考核及通过能力的提升具有有效性，能为港口卸车作业时间的有效利用提供依据。     

港口煤炭堆场防风网防尘效果数值模拟研究

在港口防尘措施中,常用防风网减少煤堆向空气中排防粉尘的数量,防风网的这种屏蔽作用主要是通过风洞模拟实验加以研究的,但由于其研究成本较高,限制了很多项目研究工作的开展。以秦皇岛港煤炭堆场为例,采用计算流体力学(CFD)技术对堆场防风网建设方案进行了数值模拟计算,利用美国环境保护局推荐的煤炭堆场起尘量计算公式对计算结果进行处理,通过对各种布置方案的起尘量计算来确定港口煤炭堆场的防风网建设方案。通过防风网的数值模拟计算方法,短周期低成本的完成了各种方案的对比,为防风网的建设提供很好的技术支撑。     

拨车机改造

神华黄骅港一期工程翻车机卸车线中的拨车机，在使用过程中出现不少问题： （1）该卸车线原来是由德国克虏伯公司设计的，主要用于C64摘钩翻卸作业，现铁路线已逐步更新为C70车型，其连接钩头为旋转钩头，可实现不摘钩作业，使用现有翻车机还需人工摘钩作业，严重影响翻车效率。     

33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

正San Francisco,California,June 8-13,2014.OMAE 2014 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to:·meet and present advances in technology and its scientific support;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014.     

第十二届深水操作会议和展览会(英文)

正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas.     

舰艇反鱼雷技术

对目前舰艇反鱼雷技术中的非杀伤、软杀伤和硬杀伤等比较先进的手段进行了阐述,并在此基础上分析研究了舰艇反鱼雷技术的发展趋势。     

Community-Based Management for Sustainable Fisheries Resources in Phang-nga Bay,Thailand

Fishing communities, the Government of Thailand Department of Fisheries, local nongovermnental organizations, universities, the Food and Agriculture Organization of the United Nations (FAO), and FAO's Bay of Bengal Program have undertaken a partnership in management of Phang-nga Bay's coastal resources. It is the first project of its kind in Thailand, and although still in the early stages, offers insights that may contribute to our knowledge of how we can improve our management of coastal resources, including the importance of (1) building relationships within the governance process; (2) combining education, enforcement, and economic incentives to achieve compliance; (3) implementing solutions early; and (4) government support of community-based decisions. These insights reinforce trends emerging in other coastal management projects in the Asian region.     

Catalyzing Coastal Management in Kenya and Zanzibar: Building Capacity and Commitment

Site-based projects were initiated in Chawka Bay-Paje, Zanzibar, and Nyali-Bamburi-Shanzu, Kenya, to demonstrate the benefits of an integrated coastal management (ICM) approach for addressing coastal issues such as tourism development and enhancement of resource-dependent village economies in eastern Africa. A two-year, multidonor project used three primary strategies to make rapid, but sustainable, progress toward ICM. These included using interagency government teams for ICM planning, adopting an internationally recognized framework for ICM as a project ''road map,'' and explicitly incorporating capacity-building strategies into all aspects of the project. Within two years, integrated ICM action strategies, prepared through participatory processes, were being implemented at both sites, and both teams were working to expand the scale and scope of ICM in their nation. More importantly, the project helped create committed, capable, interagency groups that continue to work together to address urgent ICM issues.     

单相PWM整流器的建模与仿真分析

文章详细分析了单相VSR型PWM整流器的整流原理,建立了电流内环,电压外环的单相VSR型PWM整流控制器的数学模型和逻辑框图。在MATLAB／Simulink软件环境中进行了仿真,分析了模型的可行性。     

A simplified method for reliability- and integrity-based design of engineering systems and its application to offshore mooring systems

This paper presents a simplified method for the reliability- and the integrity-based optimal design of engineering systems and its application to offshore mooring systems. The design of structural systems is transitioning from the conventional methods, which are based on factors of safety, to more advanced methods, which require calculation of the failure probability of the designed system for each project. Using factors of safety to account for the uncertainties in the capacity (strength) or demands can lead to systems with different reliabilities. This is because the number and arrangement of components in each system and the correlation of their responses could be different, which could affect the system reliability. The generic factors of safety that are specified at the component level do not account for such differences. Still, using factors of safety, as a measure of system safety, is preferred by many engineers because of the simplicity in their application. The aim of this paper is to provide a simplified method for design of engineering systems that directly involves the system annual failure probability as a measure of system safety, concerning system strength limit state. In this method, using results of conventional deterministic analysis, the optimality factors for an integrity-based optimal design are used instead of generic safety factors to assure the system safety. The optimality factors, which estimate the necessary change in average component capacities, are computed especially for each component and a target system annual probability of system failure using regression models that estimate the effect of short and long term extreme events on structural response. Because in practice, it is convenient to use the return period as a measure to quantify the likelihood of extreme events, the regression model in this paper is a relationship between the component demands and the annual probability density function corresponding to every return period. This method accounts for the uncertainties in the environmental loads and structural capacities, and identifies the target mean capacity of each component for maximizing its integrity and meeting the reliability requirement. In addition, because various failure modes in a structural system can lead to different consequences (including damage costs), a method is introduced to compute optimality factors for designated failure modes. By calculating the probability of system failure, this method can be used for risk-based decision-making that considers the failure costs and consequences. The proposed method can also be used on existing structures to identify the riskiest components as part of inspection and improvement planning. The proposed method is discussed and illustrated considering offshore mooring systems. However, the method is general and applicable also to other engineering systems. In the case study of this paper, the method is first used to quantify the reliability of a mooring system, then this design is revised to meet the DNV recommended annual probability of failure and for maximizing system integrity as well as for a designated failure mode in which the anchor chains are the first components to fail in the system.     

无人反潜系统自主指挥控制研究

无人反潜系统的指挥控制问题是关系其具备实际作战能力的主要问题之一。论文在分析无人反潜系统指控原理和其自主指控水平分级的基础上,采用可变自主控制结构,研究了无人反潜系统分级可变自主指控实现的方法。该方法可赋予无人反潜系统可变的指挥控制自主性,使其在工作环境中能够实时评估自身的自主能力,并主动引入人工干预。这种具备人机智能融合特性的自主指挥控制方法更适应无人反潜系统在复杂战场环境中实战化的需求。     

船舶系泊定位装置方案介绍

简述船舶定位装置的功能、组成、工作原理及需要注意的问题等,对船舶系泊定位的设计有借鉴意义.