面向车联网的IEEE 802.15.4协议兼容射频芯片的驱动设计

完成了兼容IEEE 802.15.4协议的AT86RF230射频芯片的驱动设计,经过实际环境的测试,该驱动运行稳定可靠,最大信息传输速率能够达到250 kb.s-1,能够满足车辆间信息传输的应用。     

车用电动增压器

现代汽车发动机多采用增压技术,增加进入发动机汽缸空气量,以达到增大动力的目的。 如众所知,传统机械增压器由发动机曲轴带动,其转速随着发动机转速的变化而变化。而涡轮增压器是利用发动机排出的废气推动增压器工作,会产生加速迟滞现象,增压值越大,动力衔接越不易平顺。     

无刷直流电动机的系统仿真

建立了一个块路结合的无刷直流时机系统数学模型,对其稳态动特性进行了仿真,并分析了不同电机参数对电机性能的影响。     

居民出行时间选择及拥挤收费政策

应用基于活动的出行需求预测方法,分析了居民出行的时间分布规律与影响居民出行时间选择的因素,分别建立了出发和到达时间选择模型,用长春市居民出行调查数据对模型进行了标定和验证。用已建模型对比评价了两种拥挤收费政策,证明了调整高峰时段小汽车出行费用策略不仅可以使居民的高峰时段出行减少大约18％,而且可以抑制小汽车出行,调整城市交通方式分配结构,说明已建模型可以全面有效地进行交通需求管理政策的评价。     

成都市轨道交通客流特征分析及启示

成都市轨道交通刚刚起步,正在追赶高速发展的城镇化进程和较为清晰的城市空间布局。基于2010—2016年轨道交通运营客流数据,分析成都市开通轨道交通线路七年来的客流变化特征和成长规律,涉及客流总量、客流强度、换乘系数、换乘客流量、线路断面流量分布、进出站客流时间分布等。比较成都与北京、上海、广州等中国超大城市的轨道交通客流水平、增长步伐、变化趋势,总结成都市轨道交通客流与城市空间结构的关系,探讨对成都市轨道交通规划建设工作的启示。     

Identifying travel mode with GPS data

Travel mode identification is an essential step in travel information detection with global positioning system (GPS) survey data. This paper presents a hybrid procedure for mode identification using large-scale GPS survey data collected in Beijing in 2010. In a first step, subway trips were detected by applying a GPS/geographic information system (GIS) algorithm and a multinomial logit model. A comparison of the identification results reveals that the GPS/GIS method provides higher accuracy. Then, the modes of walking, bicycle, car and bus were determined using a nested logit model. The combined success rate of the hybrid procedure was 86%. These findings can be used to identify travel modes based on GPS survey data, which will significantly improve the efficiency and accuracy of travel surveys and data analysis. By providing crucial travel information, the results also contribute to modeling and analyzing travel behaviors and are readily applicable to a wide range of transportation practices.     

THE CLINICAL SIGNIFICANCE OF TSAb IN GRAVES' DISEASE

ＧａｏＨｕｔ（高慧）；ＪｉｎＳｈｉｘｉｎ（金世鑫）；ＺｏｎｇＪｉａｎｑｉ（宗建奇）；ＬｉＪｉａｎ（李健）；ＭａＸｉｕｐｉｎｇ（马秀萍）；ＳｈｉＢｉｎｇｙｉｎ（施秉银）ＴＨＥＣＬＩＮＩＣＡＬＳＩＧＮＩＦＩＣＡＮＣＥＯＦＴＳＡｂＩＮＧＲＡＶＥＳ＇ＤＩＳＥ...     

Innovative detector layout for automated traffic turning volume counting

Because of many advantages, loop detectors are the most common practice for obtaining data to control intersections. However, they have some drawbacks, including the fact that multiple detectors are usually required to monitor a location. The current practice in many cities is to install four consecutive loop detectors per lane, or two at the stop bar and one as an advanced detector. In some cities, there are also departure detectors. All these configurations have some practical problems and do not produce accurate counts especially in shared lanes. In this paper, a new placement configuration for departure detectors is proposed and named the mid‐intersection detector (MID). In this configuration, departure detectors are moved back to the middle of the intersection in such a way that they can be activated by more than one movement at different times. In some cases, departure detectors lack equations for calculating turning movements, a problem solved by MIDs because each movement passes more detectors along its path (without increasing the number of loops), and therefore they can produce more accurate and reliable data for obtaining turning movement counts. Copyright © 2017 John Wiley & Sons, Ltd.     

基于Matlab和FPGA的SPWM波形的实现

介绍了一种联合Matlab和FPGA生成SPWM波形的方法.首先在Matlab中搭建SPWM控制算法的SIMULINK模型,获得一个SPWM波形周期的离散数据,然后根据这些数据在FPGA中直接生成SPWM波形.该方法使得FPGA的设计工作大为简化,具有较高的工程应用价值.     

现代舰船计划修理技术管理方法介绍

介绍一种新的现代舰船计划修理技术管理方法,即总技术责任单位牵头的技术管理体制.在保障模式上,舰船研制的总体设计单位作为修理的总技术责任单位参与舰船计划修理;在技术管理方法上,总技术责任单位在分析进行修理设计、技术状态控制、修理效果验证必要性的基础上,提出进行预防性维修方案设计、故障修理方案设计、原则工艺设计、修理完工设计以及进行技术状态控制、追加和扩大工程控制、备件换新控制等,并编制修理试验大纲和试验册.