船舶安全管理决策的多目标信息效用模型研究

根据船舶安全管理决策的复杂性,运用多目标效用理论,构建了船舶安全管理决策的多目标信息效用模型,并以船舶适航性和经济效益为目标,对所建立的模型进行验证,表明其科学性和合理性。该模型的建立对于理顺安全管理决策多目标之间的关系,实现船舶安全管理决策的科学化,具有十分重要的现实意义。

复杂多约束UAVs协同目标分配的一种统一建模方法

多无人机协同目标分配(Multi-UAVs cooperative target assignment problem,MUCTAP)是一个条件复杂的多模型、多约束组合优化问题,很难用一致的方法获得可行的解.为解决该问题,本文对各种目标分配模型统一建模,设计了一致的模型处理方法;针对三维环境特点,提出利用空间垂直切面计算无人机估计航程代价的方法,并利用航程代价矩阵优化目标分配算法;同时加入协同约束关系计算,提高分配算法的准确性.仿真实验验证了该方法能够处理多种情况的目标分配问题,具有较高的通用性和准确性,能够有效完成多机协同目标分配任务.

Modeling of the Multi-Target Locating and Tracking in the Field Artillery System

A method for the multi target locating and tracking with the multi sensor in a field artillery system is studied. A general modeling structure of the system is established. Based on concepts of cluster and closed ball, an algorithm is put forward for multi sensor multi target data fusion and an optimal solution for state estimation is presented. The simulation results prove the algorithm works well for the multi stationary target locating and the multi moving target tracking under the condition of the sparse target environment. Therefore, this method can be directly applied to the field artillery C 3I system.

FAST WAY FOR MOVING OBJECT TRACKING BASED ON BALLOON SNAKE WITH REGION INFORMATION

A novel Snake model with region information is proposed to detect and track moving objects. Generally, the region-information-based approach is sensitive to illumination changes and small movement in the background, while the edge-information-based approach often obtains incorrect results for ambiguous images. The two types of information are introduced in computing the image force. Edge-information-based features make the algorithm fast and robust, and region information makes the active confour energy function obtains correct results for ambiguous images. Furthermore, an automatic contour initialization method using double difference images is given to meet the requirement of video sequence tracking. Meanwhile, a simple forecast section is added to estimate the position of the contour in the algorithm so that it can improve the convergence speed of the active contour. Experimental results show that the computation time of the algorithm is less than 0.1 s/frame. And it can be applied to a real-time system.

Multi-objective evolutionary approach for UAV cruise route planning to collect traffic information

Unmanned aerial vehicle(UAV)was introduced as a novel traffic device to collect road traffic information and its cruise route planning problem was considered.Firstly,a multi-objective optimization model was proposed aiming at minimizing the total cruise distance and the number of UAVs used,which used UAV maximum cruise distance,the number of UAVs available and time window of each monitored target as constraints.Then,a novel multi-objective evolutionary algorithm was proposed.Next,a case study with three time window scenarios was implemented.The results show that both the total cruise distance and the number of UAVs used continue to increase with the time window constraint becoming narrower.Compared with the initial optimal solutions,the optimal total cruise distance and the number of UAVs used fall by an average of 30.93% and 31.74%,respectively.Finally,some concerns using UAV to collect road traffic information were discussed.

Measuring Contribution of BIM （Building Information Modeling） to the Construction Sustainability Goals

＂BIM （building information modeling）＂ and ＂sustainability＂ are two frequently used words in construction and academia today. BIM is a design-oriented tool, which generates a virtual three-dimensional model of a project. Sustainability refers to prudent use of earth＇s natural resources, and construction sustainability is the application of this principle to building activities. Societies in general and the construction industry in particular--one of the largest in terms of natural resources consumed and waste produced--place high hopes on BIM and the principles of sustainability to reduce consumption and waste and to increase industry productivity. BIM＇s capabilities and limitations, currently more focused on model creation and energy simulations, are not well understood as they relate to construction sustainability and its goals. No method yet exists to evaluate BIM＇s contribution comprehensively to construction sustainability goals. This study presents a construction sustainability goals contribution matrix for BIM. The matrix indicates that this contribution may be more limited than it is commonly thought.

Cross-Layer Design and Ant-Colony Optimization Based Routing Algorithm for Low Earth Orbit Satellite Networks

To improve the robustness of the Low Earth Orbit(LEO) satellites networks and realise load balancing, a Cross-layer design and Ant-colony optimization based Load-balancing routing algorithm for LEO Satellite Networks(CAL-LSN) is proposed in this paper. In CALLSN, mobile agents are used to gather routing information actively. CAL-LSN can utilise the information of the physical layer to make routing decision during the route construction phase. In order to achieve load balancing, CALLSN makes use of a multi-objective optimization model. Meanwhile, how to take the value of some key parameters is discussed while designing the algorithm so as to improve the reliability. The performance is measured by the packet delivery rate, the end-to-end delay, the link utilization and delay jitter. Simulation results show that CAL-LSN performs well in balancing traffic load and increasing the packet delivery rate. Meanwhile, the end-to-end delay and delay jitter performance can meet the requirement of video transmission.

目标数据库在防护工程毁伤评估中的应用探讨

毁伤评估系统是解决防护工程生存能力和作战保障能力评估问题的有效工具。重要防护工程目标由于规模大、类型多、参数复杂导致建模难度大、效率低,严重阻碍了防护工程毁伤评估系统的发展。结合目前BIM、GIS、3DGIM等信息化工具的发展趋势,提出通过完善建模标准,利用勘察、设计阶段建立的GIS、BIM、3DGIM模型作为目标模块开展毁伤评估的思路,既可利用模型中基础数据开展毁伤评估,又可借助三维空间模型开展仿真计算和视景显示。探讨了应用中需要解决的3个方面问题:建模标准、3DGIM建模、多源数据融合,最后提出了相关措施及建议。