大连港土地资源管理方式的转变

2003年4月,大连市市委、市政府决定大连港实施政企分开管理体制改革,组建大连港口管理局和大连港集团有限公司,同年5月8日,大连港集团有限公司(以下简称集团)正式挂牌.在新形势下,土地资源管理工作应该如何做便成为摆在集团面前亟待解决的问题.     

Residual Chart with Hidden Markov Model to Monitoring the Auto-Correlated Processes

Autocorrelations exist in real production extensively, and special statistical tools are needed for process monitoring. Residual charts based on autoregressive integrated moving average (ARIMA) models are typically used. However, ARIMA models need a quite amount of experience, which sometimes causes inconveniences in the implementation. With a good performance under less experience or even none, hidden Markov models (HMMs) were proposed. Since ARIMA models have many different performances in positive and negative autocorrelations, it is interesting and essential to study how HMMs affect the performances of residual charts in opposite autocorrelations, which has not been studied yet. Therefore, we extend HMMs to negatively auto-correlated observations. The cross-validation method is used to select the relatively optimal state number. The experiment results show that HMMs are more stable than Auto-Regressive of order one (AR(1) models) in both cases of positive and negative autocorrelations. For detecting abnormalities, the performance of HMMs approach is much better than AR(1) models under positive autocorrelations while under negative autocorrelations both methods have similar performances.     

拓扑优化技术在车辆工程CAE中的应用

在社会高速发展的时代背景影响下,国民生活的物质水平不断上升,汽车已经成为了人们生活中必不可少的重要出行工具,国民汽车的普及率不断上升,为汽车产业发展奠定了重要基础.随着汽车产业的不断发展,车辆工程CAE愈加复杂,为了充分提升汽车的结构力学性能,拓扑优化技术在车辆工程CAE中的应用愈加重要,成为了新时代下推动企业产业发展...     

前簧弯耳平销断裂失效分析

通过化学成分分析、硬度测试、渗碳层深度检测、断口形貌分析以及微观组织检查等实验分析,确定了重型卡车前簧弯耳平销断裂原因。分析结果表明：碳浓度过高,致使零件表层析出大量断续网状碳化物,增大了材料局部脆性,弱化了晶界,导致零件在装配时发生断裂。     

沥青路面水损坏及防治措施分析

该文分析了沥青路面水损害的类型和特点,论述了沥青路面产生水损害的原因,提出了防治措施。     

南京宁和城际轨道交通大胜关桥感应电压吸收装置设计

高铁和城际轨道交通同桥近距离敷设并线过江,这在国内建设的城际轨道交通线路中未有先例可循,而由此带来的由电磁感应造成的安全隐患尤为突出.对高铁与城际轨道交通同桥并行情况下,高铁对城际轨道交通所产生的电磁影响进行了定量分析与计算,并在此基础上提出了感应电压吸收装置的设计方案.阐述了该装置的功能及其部件选型.     

Analyzing the impact of a planned transit-oriented development on mode share and traffic conditions

ABSTRACT

Transit-oriented development (TOD) is a popular planning strategy used to maximize accessibility to transit for various trip purposes. The quantitative effects of TOD on travel mode shift and traffic congestion have not been extensively tested in the current literature. This paper utilizes a seemingly unrelated regressions (SUR) mode share model and a mesoscopic dynamic traffic assignment (DTA) model to analyze the impact of a planned TOD in Maryland. The proposed model aims at improving the understanding of the quantitative impacts of such a TOD on mode share and traffic congestion. The main result of the mode share model indicates that the increase in transit ridership for a transit accessible shopping center is not that significant. Local traffic conditions will deteriorate due to a lack of investment in road infrastructure planned for the TOD area. The proposed method could be a valuable tool for other indicative land development or transportation policy analyses.     

“普查分级+重点监测”的滑坡监测方案研究

为解决滑坡地质灾害监测区域范围过大、隐患点普查难度和成本高、预警分析准确率低等难题,提出“普查分级+重点监测”的滑坡监测方案。首先,采用“InSAR+无人机”遥感技术对大范围滑坡隐患区域进行普查,通过分析InSAR和无人机遥感影像数据,确定滑坡体方位并计算其坡度、高差和长宽比等结构特征参数,进而确定其灾害发生概率和危险性,并据此对监测区域进行分级,以划定重点监测区。然后基于北斗/GNSS观测站、钻孔测斜仪、雨量计等多种设备自动化获取重点监测区滑坡体全方位、立体化的形变数据,综合分析判定滑坡体警戒状态。研究表明,通过多种测绘技术的综合设计与利用,实现了滑坡地质灾害“不重不漏、重点监测”的监测目标。     

集成式辊压型材在客车车身结构轻量化设计中的应用探讨

以客车车身腰梁流水槽一体化型材为例,提出集成式辊压型材的设计思路,分析其在客车上的应用场景,为客车轻量化设计提供一种思路.     

基于GMM和枪声的军事环境判别

枪声在军事环境下是一个令人高度重视的声音信号。针对其所含信息量的重要性,提出了一种基于枪声检测的军事环境判断方法。首先利用基于中值滤波的算法检测出枪声的起止点;采取反应人耳听觉机理的声音信号动态特征-Mel倒谱系数描述声音信号;然后利用基于高斯混合模型的枪声检测及识别系统完成对枪声的分析从而实现对当前军事环境的判断。实验结果证明了该方法的准确性和有效性。