基于Kalman滤波器的INS/WSN紧组合导航系统模型

在基于惯性导航系统和无线传感器网络的组合导航系统中,为了解决传统导航信息松组合方法中测量信息可观性较差的问题,提出了一种基于卡尔曼滤波器的导航信息紧组合模型.当无线传感器网络的信号可用时,组合导航系统将惯性导航系统测量得到的未知节点与已知节点的距离与无线传感器网络测量得到的距离作差,差值作为卡尔曼滤波器的测量信息.由于...     

Location-based smartphone games in the context of environmental education and education for sustainable development: fostering connectedness to nature with Geogames

Abstract

Geogames are complex location-based games for smartphones and they are part of a critical discussion within the community of environmental education. The aim of the study is to asses if smartphone games are suitable to foster connectedness to nature and if there are differences between a complex Geogame and a less-demanding treasure hunt. For this purpose, two established scales are used in a pre-post-test-design: the inclusion of nature in self (INS) and the disposition to connect to nature (DCN). Furthermore, the game-related enjoyment was controlled. The results reveal a significant increase of the INS for both game formats, with the strongest effect for the former more nature distant subjects. The DCN-scale shows a similar tendency but not a significant gain. Between the game formats, no significant difference is detectable. So, the main effect seems to be the location-based activity in nature guided by smartphones, not the complexity of a Geogame.     

激光准直测量系统的运用和常见故障处理

基准线法是观测直线型建筑物水平位移的重要方法,文章介绍了捣固车激光准直测量系统的组成、工作原理和作用,重点介绍了激光准直测量系统的操作方法,总结激光准直测量系统常见故障的产生原因、处理方法以及激光准直测量系统的维护保养。     

CASIO可编程计算器在平曲线现场测量计算中的应用

对于高等级公路而言,为使路线的平面线形更加符合汽车的行驶轨迹,确保行车的安全与舒适,高路桥工程中平曲线的放样精度至关重要.为提高平曲线的放样精度以及方便现场随时对任意坐标的计算放样,采用CASIO可编程计算器可大大提高其计算精度和速度.通过介绍CASIO可编程计算器的原理以及在江阴大道实际工程中现场测量计算中的应用,提示了相关注意事项.     

一种基于GPS/INS的导弹制导控制系统

导弹要准确的击中目标,制导技术是关键的环节。目前GPS技术的发展和应用,推动了导弹采用GPS/INS组合制导技术的发展。本文设计了采用GPS/INS组合制导技术的导弹制导控制系统,对GPS/INS组合制导技术进行了研究,并对其中采用的卡尔曼滤波算法进行了详细的介绍。     

Promoting connectedness with nature through environmental education

It has been suggested that a positive human–nature relationship is essential for countering today’s environmental problems. Prior environmental education research has focused largely on knowledge or attitudinal outcomes, and few studies have examined the ability of environmental education programmes to promote connectedness with nature. Therefore, our goal was to (1) examine differences in connectedness with nature among a sample of children with differing ages and academic tracks, and (2) investigate whether environmental education can help promote and sustain connectedness with nature. With a pre-, post- and retention test design, we assessed a comprehensive four-day environmental education programme on water at a school field centre, using the inclusion of nature in self (INS) scale to identify the change in connectedness of 9–10-year-old pupils and 11–13-year-old pupils. We found that younger children and university-track pupils had higher INS scores than older children and general-education-track pupils, respectively. Participating in environmental education resulted in a robust short-term increase in connectedness with nature in both age groups. However, only the younger pupils’ connectedness remained sustained four weeks following the treatment. Environmental educators should keep in mind that strengthening connectedness to nature is more sustainable before the age of 11.     

Brief Introduction to Self—Adapting Hidden Markov Model Program for multiple Sequences Alignment

In this letter,we briefly describe a program of self-adapting hidden Markov model(SA-HMM) and its application in multiple sequences alignment.Program consistes of two stage optimisation algorithm.     

动态投入产出控制系统的性质

针对参考文献[8]建立的动态投入产出模型的控制系统,研究了该系统的能控性、能观性和稳定性等性质,文章认为系统具有能反映实际情况的性质:能控性和不稳定性,并给出了系统能观的判断方法。     

Interpersonal Neural Synchrony During Father–Child Problem Solving: An fNIRS Hyperscanning Study

Interpersonal neural synchrony (INS) has been previously evidenced in mother–child interactions, yet findings concerning father–child interaction are wanting. The current experiment examined whether fathers and their 5- to 6-year-old children (N = 66) synchronize their brain activity during a naturalistic interaction, and addressed paternal and child factors related to INS. Compared to individual problem solving and rest, father–child dyads showed increased INS in bilateral dorsolateral prefrontal cortex and left temporo-parietal junction during cooperative problem solving. Furthermore, the father’s attitude toward his role as a parent was positively related to INS during the cooperation condition. These results highlight the implication of the father’s attitude to parenting in INS processes for the first time.     

Aerobasics — An introduction to aeronautics 14. Air navigation principles

Air navigation has evolved over the last hundred years from an art into a mature science. Airplane accidents due to navigational errors are practically nonexistent. In large measure this advance has been due to radio aids to navigation which operate under all weather conditions. However in remote areas and in hostile airspaces, the radio aids may not be available and a fully self contained navigational device is required. Navigation by stars (celestial navigation) is feasible under such conditions. But the inertial navigation system (INS) is the preferred choice. In recent times, a navigational instrument based on radio communication with specially designed satellites in low Earth orbits called the global positioning system (GPS) has become popular. This article deals with the principles of these various methods of air navigation.     

Minimizing of the only-insertion insdel systems

INTRODUCTION In formal language theory,most language gen-erative devices are based on the operation of rewriting,but,two other operations can also play the same role:insertion and deletion operation,originally motivated mainly from linguistics.Because the phenomena that is similar to these operations has been found in DNA operations,these two language operations have come to the special attention of researchers in the DNA computing area.For a given string xuvy,an insertion operation(u,w…     

A critical consideration of the alignment between the discourse of self-regulated learning and neoliberalism

Self-regulated learning (SLR) is a socially embedded process in which individuals use strategies to influence thoughts, behaviours and environments in ways that enable them to achieve their academic goals. As a form of engagement that is almost exclusively associated with academic success, empowerment and agency, researchers are committed to improving conceptualisations of, measurements for and pedagogical interventions related to SLR. However, there is little attention to critical issues that underpin this discourse. Against this trend, I explore an alignment between SLR and neoliberalism, which is a contentious ideology that is implicated in reproducing inequality, promoting radical individualism and eroding democratic responsibility. From this alignment, taking up the aim to teach students to regulate their learning is implicated in: (1) creating manageable workers; (2) endorsing a view of self and personhood that is class-based; and (3) contributing to efficiently and effectively reproducing a class hierarchy. Environments that teach and reward SLR may pose greater disadvantages for working-class students than their middle-class counterparts.     

“网络学习共同体”的构建初探——一个基于“北京大学教学网”的实证案例

如何利用网络教学方式促进研究型大学教学水平的提高?在融合学习共同体与网络学习的概念之后,我们构建了"网络学习共同体"的理念,并提出垂直、水平、自我和延伸学习等四个层级为特征的教学方法,认为这一教与学的模式可以结合传统课堂与网络教学的优势,为普通高等教育提供一个新的教学思路。基于"北京大学教学网"提供的B lackboard平台,我们对这一模式进行了初步的实践,并对实践结果进行了实证分析。     

How Schoolchildren Propose to Negotiate: The Role of Social Withdrawal, Social Anxiety, and Locus of Control

The role of social anxiety, social withdrawal, and locus of control in the developmental level of interpersonal negotiation strategies (INS) when resolving hypothetical conflicts was examined in a short-term longitudinal study (fall and spring). Applying a balanced design, 96 children aged 8 and 11 from 8 classes participated in the study. At both assessments, results indicated that sociable children were more likely to exhibit greater competence in INS than socially withdrawn children. However, both concurrent and longitudinal analyses indicated that degree of social anxiety tended to influence this relation. Among less socially anxious children, the sociable children did exhibit greater INS competence than those more socially withdrawn, but this relation was not revealed among the more socially anxious children. Finally, on the whole, children who showed internal locus of control were more competent at INS than children with external locus of control.     

Issues in the adoption of broadband-enabled learning

This paper presents one case of broadband‐enabled learning (BEL) involving geo‐culturally and organisationally diverse collaboration using music as the vehicle. Findings from five evaluations over a 15‐month period were considered in relation to issues of relative advantage, compatibility, complexity, trialability, and observability. Advantages included access to mentors, peers, and experts; support for cross‐cultural and linguistic collaboration, interaction, and exchanges; promotion of a more open classroom; and exposure to alternative and new experiences. Compatibility with existing practices was evident, however, cross‐cultural interaction presented difficulties as did synchronous communication across time zones and between institutions. BEL technologies are complex, however, users can develop a capacity to use the tools if provided with adequate support. Trialability is dependent on access to a high‐speed connection and equipment, multiple partners, development of technical expertise, and support. Use of videoconferencing and choice of subject area can enhance observability.     

线性时变离散系统的状态估计

放弃了Luenberger状态估计理论对系统完全可观测性的要求,提出了一般线性离散系统状态估计的方法.对于j=i,i-1,给出了系统完全(i,j,Ti)可重构这一新概念的充要条件.     

Surface-mounted bender elements for measuring horizontal shear wave velocity of soils

The bender element testing features its in-plane directivity, which allows using bender elements to measure the shear wave velocities in a wider range of in-plane configurations besides the standard tip-to-tip alignment. This paper proposed a novel bender element testing technique for measuring the horizontal shear wave velocity of soils, where the bender elements are surface- mounted and the axes of the source and receiver elements are parallel to each other. The preliminary tests performed on model ground of silica sand showed that, by properly determining the travel distance and time of the shear waves, the surface-mounted bender elements can perform as accurately as the conventional ＂tip-to-tip＂ configuration. Potentially, the present system provides a promising nondestructive tool for characterizing geomaterials and site conditions both in laboratory and in the fields.     

山区旅游公路设计浅析

分析了山区旅游公路的设计思想,提出了山区旅游公路设计的建议：在保护生态环境的前提下,加强道路的整体美学研究,使其具有重要的景观价值;山区旅游公路平面线形的选取应通过道路的曲直变化增加道路的生动性;建筑物与构造物的设计要求与现有的景观相协调;安全、休息、绿化设施要齐全并与自然环境相结合.     

离散线性时变系统的状态观测器

放弃Luenberger状态观测器理论对系统完全可观测性的要求 ,提出了一般离散线性时变系统的状态观测器的设计方法。对j =i,i- 1,给出了系统完全 (i,j,Ti)可重构的新概念 ,且给出了可重构的充要条件