一种基于实时几何测距的船桥主动防撞方法

本文提出一种基于实时几何测距的船桥主动防撞方法。该方法对船的改动量甚微,仅需维持多项距离矩阵,通过告警逻辑矩阵进行展示与告警,能起到很好的船桥防撞提示效果。     

车辆高速避让路径跟踪控制策略

建立车辆动力学模型,研究车辆在高速避让工况下的路径跟踪控制策略。基于自抗扰控制设计车辆横摆角速度以及道路曲率2种不同的路径跟踪控制器;设计基于车辆偏航位移和偏航角度加权的线性二次最优控制器;对3种控制器控制效果进行仿真验证,分析路径跟踪侧向位移误差、侧向加速度、前轮转向角以及偏航角度变化。越野车实车测试结果表明,路径跟踪控制策略正确。     

A thermal-aware VM consolidation mechanism with outage avoidance

Efficient energy and temperature management techniques are essential elements for operators of cloud data centers. Dynamic virtual machine (VM) consolidation using live migration techniques presents a great opportunity for cloud service providers to adaptively reduce energy consumption and optimize their resource utilization. In recent studies, power consumption readings of individual physical hosts were chosen as the main monitoring parameters in their allocation policies, whereas very few have considered host temperature, which has shown to have a negative impact on server reliability, as a migration criterion. In this work, a thermal-aware VM consolidation mechanism is proposed for resource allocation optimization and server reliability assurance. We consider the variability in host temperature as a migration criterion to avoid outage incidents via having better VM consolidations. Extensive simulation results obtained from CloudSim show the promising performance of the proposed mechanism in energy saving while reducing the number of server outage incidents due to fluctuations in host temperature.     

H2NG environmental-energy-economic effects in hybrid energy systems for building refurbishment in future National Power to Gas scenarios

In order to comply to the ambitious targets of European Hydrogen Strategy, Member States will strongly encourage the deployment of Power-to-Gas (PtG) technologies. A significant fraction of produced green hydrogen will be injected into the existing natural gas networks, and the end-users will be served by Hydrogen enriched Natural Gas blends (H₂NG). The aim of this paper is to analyse the H₂NG effects on technical, economic and environmental parameters of hybrid energy systems for building refurbishment. Three hybrid energy systems for the existing plants replacement have been proposed, dynamically simulated and compared with the separate generation. Fuel supply has been simulated by varying the H₂ volumetric fraction in a range between 0 and 20%vol. The H₂NG blend employment will allow greater primary energy savings and avoided emissions. However, if the levelized cost of hydrogen (LCOH) due to electrolysis does not decrease, those benefits will be offset by a lower economic competitiveness.     

煤矿地面轨道运输矿车自动避障技术研究

介绍了煤矿地面轨道运输矿车自动避障技术。首先介绍了基于雷达的矿车前方障碍物检测技术及其相关算法,然后详细介绍了基于机器视觉的矿车前方障碍物检测系统和常用的图像处理方法以及相关的算法,最后介绍了雷达和机器视觉融合的障碍物检测技术在煤矿地面轨道运输矿车自动避障过程中的应用。     

The mediating role of problematic social media use in the relationship between social avoidance/distress and self-esteem

The number of social media users in Bangladesh is increasing in every year. Young people – mainly college and university students – are the heavy users of it. Problematic social media use (PSMU) has received increasing research attention over the past decade. However, there are very few studies concerning PSMU in Bangladesh. The present study examined the role of PSMU in the relationship between social avoidance/distress and self-esteem. The study comprised a sample of 370 university students from the University of Chittagong (Bangladesh). Participants were administered a survey including questions regarding socio-demographics, the Bergen Social Media Addiction Scale (BSMAS), the Rosenberg Self-Esteem Scale (RSES), and the Social Avoidance and Distress Scale (SADS). Results showed that PSMU partially mediated the relationship between social avoidance/distress and self-esteem, while social avoidance/distress predicted the level of self-esteem. However, PSMU had a non-significant influence on the relationship between these two variables while self-esteem predicted social avoidance/distress.     

我国西北矿产资源开发利用的风险规避研究

在对西北矿产资源开发的环境风险和资源风险进行分析的基础上，从系统和整体的角度，提出了5种主要的矿产资源风险规避策略。第一，走绿色矿业的道路，规避环境风险；第二，走企业集团化道路，规避市场风险；第三，走技术链条化道路，规避资源风险；第四，走城、矿耦合化道路，规避“矿枯城衰”风险；第五，加大矿产资源勘察力度，提高抗风险的能力。     

住房抵押贷款的理性违约及其风险的规避

分析了住房抵押贷款中借款人的理性违约，认为因住房贬值而导致的借款人理性违约，实质上是住房的价格风险在供款人和贷款人之间的重新再分配。基于对我国住房抵押贷款市场中缺乏违约风险规避机制的分析，作者提出了建立我国由政府性质的担保机构和商业保险公司共同提供保险的综合违约风险规避机制的设想。此外，就建立政府性质担保机构的问题进行了着重探讨，通过对美国联邦住房管理局（FHA）的住房抵押贷款互助保险基金（MMIF）的分析，并结合中国实际，得出了中国有必要设立政府性质担保机构的结论。     

中日“防灾公园”和“城市防灾避险绿地”概念辨析

城市绿地是城市防灾避险体系中的重要载体,近些年城市防灾避险绿地的研究与建设逐渐受到重视。日本灾害频发,因此在防灾避险建设领域拥有较为丰富的经验和信息。在学习和借鉴中,中国的防灾避险研究与建设也在逐步发展。但目前从中日的相关研究来看,"防灾公园""防灾据点"等概念的实际应用在两国之间存在着一定的差异。本文分析了中、日相关文献,辨析了"防灾公园""防灾据点"等概念的定义及与"城市防灾避险绿地"的关系,细分了城市防灾避险绿地的类型。最后对中日两国防灾公园的概念定义和范围进行了对比,得到了日本"防灾公园"这一概念的实质更接近于中国"城市防灾避险绿地"这一概念的结论。     

基于深度信息的巡逻机器人避障系统实现

针对巡逻机器人的避障导航,基于Realsense深度摄像头获取环境深度信息,在使用机载计算机对深度图像进行分层处理的基础上,设计了巡逻机器人避障导航系统,同时对巡逻机器人通信协议以及决策流程等进行了改进设计,最后在ROS机器人开源操作系统上对其进行实验及验证。实验结果表明,在相同环境下,该方法能使巡逻机器人快速、安全、有效地避开静态障碍物而到达目标点。该方法不仅能够提高避障的成功率,获得实时避障效果,而且能够降低巡逻机器人的数据处理量,有利于巡逻机器人的移植。