一种新的船型主尺度要素的数学模型

主尺度要素数学模型的建立是一项重要的工作.在分析支持向量机回归方法的基础上,提出了一种新的船舶主尺度要素模型,即基于支持向量机的数学模型.与传统数理统计回归分析方法和RBF神经网络模型相比,其具有收敛速度快,精度比较高.实践证明,该方法在船舶设计船型主尺度要素建模等复杂系统方面是实用和可靠的.     

基于支持向量机的船型主尺度要素数学建模

主尺度要素数学模型的建立是一项重要有益的工作,提出了用支持向量机对船舶主尺度要素数学建模,与传统数理统计回归分析方法和RBF神经网络模型相比,其精度比较高。实践证明,该方法在船舶设计船型主尺度要素建模等复杂系统方面是实用的和可靠的。     

基于单参数的Lagrangian支持向量回归算法及其应用

支持向量机（Support Vector　Machines，SVM）是基于统计学习理论框架下的一种处理非线性分类和非线性回归的有效方法。由于具有完备的理论基础和出色的学习性能，该方法已成为当前国际机器学习界的研究热点，能较好地对解决小样本、高维数、非线性和局部极小点等实际问题。提出了一种基于单参数的Lagrangian支持向量回归算法，并将该算法应用在外贸货物吞吐量预测中。估算结果证明了这种改进的支持向量回归算法在吞吐量预测中的有效性和实用性。     

支持向量机回归方法在船价指数预测中的应用

采用一种改进的支持向量机回归算法对船价指数进行预测，并与常规的回归建模方法进行比较。同时应用实例进行论证，估算结果证明了该算法在船价指数预测中的有效性和实用性。     

加权支持向量回归算法在运力预测中的应用

支持向量机(Support Vector Machines,SVM)是基于统计学习理论框架下的一种新的通用机器学习方法,是一种处理非线性分类和非线性回归的有效方法。由于具有完备的理论基础和出色的学习性能,该技术已成为当前国际机器学习界的研究热点,能较好地解决小样本、高维数、非线性和局部极小点等实际问题。近来,SVR方法被引入求解回归和预测问题,并在各领域中得到广泛的应用。本文在分析现有基于高斯核的支持向量回归方法优缺点的基础上,突破目前在构造支持向量机中存在的"所有支持向量与样本之间的在特征空间中的内积所对应的核函数参数一定要相等"的这一思维定势,提出了一种新的算法——"基于高斯核参数加权的支持向量回归机"算法,并将该算法应用在世界散货船队运力预测中。估算结果证明了这种改进的支持向量回归算法在船队运力预测中的有效性和实用性。     

一种船舶组合导航系统混合误差模型及应用

针对GPS与微机电系统组合导航系统存在高非线性的缺陷,特别是GPS失效期间同卡尔曼滤波方位估计相关的不确定性的影响,提出混合误差模型。使用支持向量机对卡尔曼滤波输出进行建模,利用基于自回归的快速正交搜索对非线性方位误差进行建模,针对GPS/简化的惯性传感器系统利用混合支持向量机-快速正交搜索方法同传统卡尔曼滤波和增强卡尔曼滤波-快速正交搜索方法进行比较,结果表明,混合支持向量机-快速正交搜索方法优于卡尔曼滤波算法和增强卡尔曼滤波-快速正交搜索算法。     

加权支持向量回归算法在船舶智能建模中的应用

在分析现有基于高斯核的支持向量回归方法优缺点的基础上,将高斯核参数加权与支持向量回归算法相结合,实现了一种"基于高斯核参数加权的支持向量回归算法".在该新算法中引入一种带权重因子的核函数,其中权重因子由输入向量来确定,同时将该算法应用在散货船舶主尺度要素智能化建模中并与常规算法进行了比较.试验结果表明了这种改进的支持向...     

一种新的支持向量回归算法及其在集装箱吞吐量预测中的应用

支持向量机是基于统计学习理论框架下的一种新的通用机器学习方法,是一种处理非线性分类和非线性回归的有效方法。由于具有完备的理论基础和出色的学习性能,该技术已成为当前国际机器学习界的研究热点,能较好地对应解决小样本、高维数、非线性和局部极小点等实际问题。近来,SVR方法被引入求解回归和预测问题,并在各领域中得到广泛的应用。文章提出了一种新的基于单参数的Lagrangian支持向量回归算法,并将该算法应用在集装箱吞吐量预测中。估算结果证明了这种改进的支持向量回归算法在集装箱吞吐量预测中的有效性和实用性。     

基于单参数的Lagrangian支持向量回归算法及其应用

支持向量机(Support Vector Machines,SVM)是基于统计学习理论框架下的一种处理非线性分类和非线性回归的有效方法。由于具有完备的理论基础和出色的学习性能,该方法已成为当前国际机器学习界的研究热点,能较好地解决小样本、高维数、非线性和局部极小点等实际问题。这里提出了一种基于单参数的拉格朗日(Lagrangian)支持向量回归算法,并将该算法应用在外贸货物吞吐量预测中。估算结果证明了这种改进的支持向量回归算法在吞吐量预测中的有效性和实用性。     

基于主成分和支持向量机的设备寿命周期费用建模方法

提出运用主成分分析法和支持向量机技术相结合的分析法来减少影响设备寿命周期费用因素的数量,降低建模的难度。利用主成分分析法来约简影响因素,采用支持向量机技术来建模,减少非线性数据带来的不确定性。采用Matlab中的支持向量机工具箱,建立回归估算模型,并以实例分析验证本方法的可行性。     

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.     

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.     

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.     

含裂纹钢板复合材料修补强度和刚度数值分析

用ANSYS有限元分析软件对复合材料补片修复含边裂纹和中心裂纹钢板的强度和刚度进行了数值分析.引入相对刚度的概念,研究了钻有止裂孔裂纹的长度对损伤钢板相对刚度的影响,分析了损伤钢板刚度复合材料贴片修补效果;引入屈服载荷提高率的概念,分析了损伤钢板强度的修复效果.     

第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 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;     

混凝土道路、堆场面层裂缝的产生与防治

从混凝土道路、堆场的各个结构层分析裂缝产生的原因,并针对性地说明预防措施,阐述裂缝维修方法。     

利比亚米苏拉塔市萨瓦瓦区5000套住宅项目中心区设计

从确定符合项目实际情况的设计原则入手,通过利比亚米苏拉塔市萨瓦瓦住宅区中心区总体布局和建筑设计两个方面的设计实践,探讨了"传统、现代与文脉"这一当今时代无法回避的文化议题。并且针对具有鲜明文化、宗教和气候特征的建筑设计的特点、方法与风格进行了总结,为今后的实践提供借鉴。     

沉箱重力式码头施工期间沉降位移观测与分析

介绍某码头工程3万吨级码头和5000吨级码头施工期间的沉降变位观测过程及对观测数据的分析,为类似工程提供参考。     

恶劣电磁环境下PLC控制系统抗干扰技术研究

该文结合工程实践,研究了某型船模PLC控制系统抗干扰技术。依据干扰产生的原因,分析了系统干扰的来源,并提出了抑制干扰的具体措施。通过硬件和软件的优化设计,提高了控制系统抗干扰能力。实践证明,经过优化设计的PLC控制系统运行安全,稳定,控制效果得到明显提高。