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。     

基于RFID的煤矿安全监控系统设计与实现

针对煤矿的恶劣环境对安全监控系统所提出的要求,结合ARM及RFID技术,提出一种基于RFID的煤矿安全监控方案。设计的RFID系统主要以TI公司16位单片机MSP430F2122为标签微控制器,以CYRF6936为射频前端核心芯片,以MH-440甲烷传感器作为数据采集模块,监控分站(读卡器)以ARM9为主控制器。详细介绍了数据采集节点以及监控分站的硬件原理和软件设计思想,给出了硬件原理图及软件设计流程。经测试证明该系统具备良好的性能,适于井下使用。     

Correlating mobile phone usage and travel behavior – A case study of Harbin,China

Information and communication technologies (ICTs), such as mobile phones and the Internet, are increasingly pervasive in modern society. These technologies provide new resources for spatio-temporal data mining and geographic knowledge discovery. Since the development of ICTs also impacts physical movement of individuals in societies, much of the existing research has focused on examining the correlation between ICT and human mobility. In this paper, we aim to provide a deeper understanding of how usage of mobile phones correlates with individual travel behavior by exploring the correlation between mobile phone call frequencies and three indicators of travel behavior: (1) radius, (2) eccentricity, and (3) entropy. The methodology is applied to a large dataset from Harbin city in China. The statistical analysis indicates a significant correlation between mobile phone usage and all of the three indicators. In addition, we examine and demonstrate how explanatory factors, such as age, gender, social temporal orders and characteristics of the built environment, impact the relationship between mobile phone usage and individual activity behavior.     

基于无线的物联智能家居控制系统设计

提出一种基于无线的物联智能家居控制系统设计,该系统通过PXA270和nRF24L01模块实现无线采集、发送各项家居信息;通过GSM通信将烟雾、煤气、红外等传感器的异常报警信息以短信方式通知用户,并连接PXA270的PC实现实时远程监控。经过测试,该系统工作稳定,便于实际应用,市场前景广阔。     

飞思卡尔单片机在自动排爆车控制系统中的应用

系统以飞思卡尔公司MC9S12DG128单片机为主、以STC12C5410AD单片机为辅实现排爆车的控制核心,采用CCD图像识别技术,将检测到的数据传送给单片机,对数据进行相应处理,LCD液晶显示及语音播报。实验证明,系统方案合理,性能良好,能够实现竞赛题目的各项要求。     

OFDM低压电力线通信系统的符号同步及其FPGA实现

为采用FGPA技术可靠实现基于G3-PLC协议的OFDM电力线通信系统的符号同步,推导了符号同步偏差对G3-PLC系统性能的影响。针对传统符号同步算法存在的算法复杂、FPGA实现困难等缺点,根据G3-PLC系统的帧结构,提出了基于训练序列的新的符号同步算法。仿真结果和FGPA实现效果表明,该算法不仅能够有效地实现G3-PLC系统的符号同步,而且运算量小,硬件资源消耗少。     

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。     

Influence of participation, facilitator styles, and metacognitive reflection on knowledge building in online university courses

Understanding how to foster knowledge building in online and blended learning environments is a key for computer-supported collaborative learning research. Knowledge building is a deeply constructivist pedagogy and kind of inquiry learning focused on theory building. A strong indicator of engagement in knowledge building activity is the socio-cognitive dynamic of epistemic agency, in which students exercise a higher level of agency for setting forth their ideas and negotiating fit with those of others rather than relying on their teacher. The purpose of this paper is to investigate the influence of (a) levels of participation, (b) facilitator styles and (c) metacognitive reflection on knowledge building in two blended, post-secondary education contexts. A study of a total of 67 undergraduate students suggest that high levels of participation, a supportive facilitator style, and ample opportunities for metacognitive reflection on the students’ own participation strategies are most conducive for fostering epistemic agency for knowledge building. Implications of these results for research and instructional design of online courses are discussed.     

Exploring students’ learning experience in an international online research seminar in the Synchronous Cyber Classroom

The development of computer-mediated communication enables teaching and learning to take place across geographical boundaries. An online synchronous learning environment with cyber face-to-face features affords students the sense of learning together online. This study reports a novel design of organizing a 16-week seminar for doctoral students across Canada, Italy, New Zealand, and Taiwan in the Synchronous Cyber Classroom, an online synchronous learning environment. Students’ learning experiences were explored from the perspective of students’ interactions with students, instructors, and the content, based on which the perception of being in a learning community was formed. This article reports how this international online research seminar was organized, how students’ learning experience was analyzed, and what we learned about students’ learning in this international online research seminar.     

Internet in teachers' professional practice outside the classroom: Examining supportive and management uses in primary and secondary schools

In recent years there has been widespread interest in the implementation of information and communication technologies (ICT) in schools. While most studies primarily focus on the use of ICT in teaching and learning, little attention has been given to their incorporation as a professional tool outside the classroom. Using a digital inequality approach, the aim of this paper is to develop and test a model of the factors that affect teachers' professional use of ICT, particularly the Internet, in primary and secondary schools. One thousand four hundred and five (1405) teachers from a representative sample of 536 primary and 273 secondary schools in Spain were surveyed. The dependent variables include attitudes towards the professional use of ICT and the use of the Internet in professional practice. The explanatory variables are the socio-demographics, school-level information, frequency of Internet access within and outside the school, educational ICT training, digital literacy, and organisational development. Controlling for socio-demographics and school-level information, multiple regression analyses are used to make inferential judgements and test the separate effects of the independent variables. Findings suggest that technological factors and organisational practices are important predictors of ICT appropriation for professional purposes.