论景观设计中的小尺度交往空间营造

阐述小尺度空间发展的必然性及重要意义,针对目前人们交往过程中出现的问题提出了小尺度空间景观设计要点,寻找适宜交往的景观设计的组成形式,以此解决城市高速发展所带来的人、城市、自然之间的矛盾,为城市居民寻求合理有效的交往方式。     

驾驶员眼部疲劳视觉检测算法及其ARM+DSP实现

将ARM+DSP技术应用于驾驶员的疲劳检测,使用S3C2440作为核心处理器,利用TMS320DM642作为视频采集处理模块,详细讨论了硬件平台与接口的设计。提出了一种简单有效的基于眼部特征的疲劳驾驶检测算法,结合单目机器视觉实现了驾驶员眼部睁闭状态的有效判定和疲劳驾驶的实时检测。在沪宁高速南京段的实验结果表明,该算法的实时性与精确性可以满足安全行驶的要求。     

三相电压型SVPWM整流器研究

详细介绍了SVPWM的原理。采用一种易于数字化实现的SVPWM算法实现三相电压型SVPWM整流器,该整流器采用dq坐标系下的双闭环控制。给出了PI调节器参数,以及主电路电感、电容的计算公式。在Matlab Simulink环境下搭建整流器仿真器模型。仿真结果表明,整流器能实现单位功率因数整流和能量双向流动,验证了SVPWM算法和控制系统设计方法的正确性。     

基于MSP430的酒驾报警减速器的研制

以MSP430为核心控制器,利用测速器、FPGA、减速器、声光报警模块和LCD1602液晶显示器,设计了一款防止酒后驾车的汽车报警减速器,实现对车速的控制和平稳停车。对数据采集过程中对数据的处理方法以及控制汽车停车控制算法作了详细阐述,整个系统经调试,能运行正常。     

Vivaldi天线及其改进方法的仿真研究

选择强方向性Vivaldi天线作为研究对象,基于等效电路等理论分析确定了天线的结构参数,采用高频仿真软件Ansoft HFSS 11对天线的电性能进行定量分析。提出在天线两侧开栅栏和尾部加抗流栅栏的优化方法,将天线金属贴片上的表面电流汇聚于槽线部分,明显改善了天线的辐射特性,在350 MHz和830 MHz的增益分别达到5.7 dBi和8.7 dBi。     

Automatic parallelisation for LTI MIMO state space systems using FPGAs. An optimisation for cost & performance

The parallelism attained by the use of Field Programmable Gate Arrays (FPGAs) has shown remarkable potential for accelerating control systems applications. This comes at a time when well established methods based on inherited serial Central Processor Units (CPUs) cannot guarantee solutions for the increasing execution speed demands. However, the transition from serial to parallel architectures represents a tremendous challenge due to overwhelming numbers of unexplored options and conflicting factors. The work presented achieves a parallelisation characterisation for generic MIMO systems using stand-alone FPGA implementations. The main contribution is that a very fine subset of possible serial/parallel implementations is obtained. This is used to achieve a flexible trade-off between cost and performance. Automatic optimisation of latency, occupied FPGA area and execution speed is attained and justified in respect to most of the feasible scenarios.     

Getting closer and experiencing together: Antecedents and consequences of psychological distance in social media-enhanced real-time streaming video

Social media services such as YouTube and Flickr have become online necessities for millions of users worldwide. Social media are online services that enable users to share contents, opinions, and perspectives that support communication with other users. Social media places an emphasis on the shared experience between users, which we call co-experience. However, the online characteristics of social media increase psychological distance between users, which, in turn, results in a decrease in the quality of co-experience. Hence, as the goal of this study, we theoretically modeled and empirically verified the antecedents and user experience-based consequences of psychological distance in a social media-enhanced real-time streaming video service. In order to reduce psychological distance, we introduced two system elements: inhabited space (the degree of being situated in context and in a meaningful place) and isomorph effects (the degree of preserving the structure of a user’s actions). We constructed a social media-enhanced real-time streaming video service prototype and conducted a field experiment with actual social media users. The prototype, which streamed a live baseball game, enabled users to simultaneously view the game from remote locations and to interact with each other through cheering tools. The results indicate that inhabited space and isomorph effects reduce psychological distance between users, and this, in turn, enhances co-experience. This paper ends with theoretical as well as practical implications of the study.     

Age-related difference in perceptual responses and interface pressure requirements for driver seat design

Due to typical physiological changes with age, older individuals are likely to have different perceptual responses to and different needs for driver–seat interface design. To assess this, a study was conducted in which a total of 22 younger and older participants completed six short-term driving sessions. Three subjective ratings (comfort, discomfort and overall) were obtained, along with 36 driver–seat interface pressure measures, and were used to assess differences and similarities between the two age groups. For both age groups, localised comfort ratings were more effective at distinguishing between driver seats and workspaces. Older individuals appeared to be less sensitive to discomfort than younger individuals. Across age groups, two distinct processes were used in determining whole-body comfort and discomfort perceptions based on localised comfort/discomfort perceptions. Whole-body discomfort levels were largely affected by lower back discomfort in the younger group versus upper back discomfort in the older group. Four specific pressure measures at several body regions differed between the age groups, suggesting distinct contract pressure requirements and loading patterns among these groups.     

A comparison of techniques to mitigate Simulator Adaptation Syndrome

We investigated the effectiveness of galvanic cutaneous stimulation (GCS) and auditory stimulation in mitigating simulator adaptation syndrome (SAS). Fifteen drivers (9 men; M age = 23.2 years) participated in a driving simulation experiment comparing three different stimulation conditions (GCS, auditory stimulation and no stimulation as a base line condition) in curves on a virtual urban circuit. GCS and auditory stimulation decreased SAS by reducing head sway. Both sources of stimulation can be recommended as countermeasures against SAS. We encourage the use of stimuli which influence the balancing ability to the design of future simulator protocols and devices to mitigate SAS.