开放式智能安全代理体系架构设计

针对目前网络安全产品、技术和安全模型存在的问题，提出一种具有开放体系架构的通用智能安全代理模型。智能安全代理由插件运行管理平台和一组插件构成。插件平台包括消息解释器、路由器、黄页及黑板等组件，负责监视和管理插件的运行。利用注册／注销，代理通信、协作与委托计算机制，多个智能安全代理可以组成一个代理社区，实现分布式异构网络环境下的协同安全防御。实践表明，该模型具有良好的开放性、通用性、多功能性，以及可伸缩、可移值、智能化和面向应用等特性，可以为各类终端节点提供多种安全保护。     

Distributed conflict-free cooperation for multiple connected vehicles at unsignalized intersections

Connected vehicles will change the modes of future transportation management and organization, especially at intersections. In this paper, we propose a distributed conflict-free cooperation method for multiple connected vehicles at unsignalized intersections. We firstly project the approaching vehicles from different traffic movements into a virtual lane and introduce a conflict-free geometry topology considering the conflict relationship of involved vehicles, thus constructing a virtual platoon. Then we present the modeling of communication topology to describe two modes of information transmission between vehicles. Finally, a distributed controller is designed to stabilize the virtual platoon for conflict-free cooperation at intersections. Numerical simulations validate the effectiveness of this method.     

Truck platooning on uphill grades under cooperative adaptive cruise control (CACC)

This paper examines CACC truck platooning on uphill grades. It was found that the design of CT policy should consider the effects of low crawl speeds on significant upgrades. Three simple solutions, which have different impacts on traffic flow efficiency, are proposed. Furthermore, truck platoons, controlled by a state-of-the-art CACC model, become asymptotically unstable beyond some critical grade. The errors are permanent, suggesting that trucks fail to re-engage after the upgrade. This occurs by complex interactions between the CACC control and the bounded acceleration capabilities of trucks. New control concepts are developed to complement the existing control model and achieve asymptotic (and string) stability. The instability mechanisms and new control concepts are not specific to the control model used.     

Optimal vehicle trajectory planning in the context of cooperative merging on highways

One of the main triggers of traffic congestion on highways is vehicle merging at on-ramps. The development of automated procedures for cooperative vehicle merging is aimed to ensure safety and alleviate congestion problems. In this work, a longitudinal trajectory planning methodology is presented, developed to assist the merging of vehicles on highways; it achieves safe and traffic-efficient merging, while minimizing the engine effort and passenger discomfort through the minimization of acceleration and its first and second derivatives during the merging maneuver. The problem is formulated as a finite-horizon optimal control problem and is solved analytically. This enables the solution to be stored on-board, saving computational time and rendering the methodology suitable for practical applications. The tunable weights, used for taking into account the different optimization criteria, may serve as parameters to match the individual driver’s preferences. The proposed methodology is first developed for a pair of cooperating vehicles, a merging one and its putative leader. Moreover, an alternative solution procedure via a time-variant Linear-Quadratic Regulator approach is also presented. A Model Predictive Control (MPC) scheme is utilized to compensate possible disturbances in the trajectories of the cooperating vehicles, whereby the analytical optimal solution is applied repeatedly in real time, using updated measurements, until the merging procedure is actually finalized. Subsequently, the methodology is generalized for a set of vehicles inside the merging area. Various numerical simulations illustrate the validity and applicability of the method.     

浅谈企业MIS系统开发中的项目管理

本文从系统观点出发,论述了企业MIS开发过程的项目管理及其多维目标,项目管理规范化的有关问题以及企业MIS开发协作单位选择等问题。     

合作学习在高职行业英语教学中的实践

本文以《艺术设计英语》为例尝试将合作学习应用于高职行业英语教学中,结果证明合作学习有利于提高学生课堂的参与度、口语表达能力及协调、组织和合作能力等。     

关于创建海事咨询中心的思考

在寻找提高学生专业知识、应用能力和实践能力的教学改革中,以校企合作的办学模式为结合点.借鉴我国高校盛行的诊所式法律教育的精神,立足于课程改革.以企业咨询的问题作为学生学习的真实环境,在指导老师带领学生解决案例的同时,也给企业提供了法律服务及业务咨询.