Development of driver-vehicle-road closed-loop semi-physical simulation system

As hybrid vehicles introduced the motor, the vehicle structure has a significant change in the power matching. Adriver-vehicle-road closed-loop semi-physical simulation system, which makes real driving parts together with the simulation car,will bring convenience to the new car design. We used the computer software to simulate the road with a slope, curve and someother features based on the actual road condition, and analyzed the whole road scene in addition to geometry and physicalcharacteristics. Analyzing and constructing the vehicle dynamics basic template, appropriate changes to the template can obtainthe desired vehicle dynamics model with an external device to control the model vehicle. It combined the physical operation system with visual display, which gave us real driving feelings and increased the vehicle design predictive accuracy.     

车辆刚体动力学ODE物性分析及虚拟仿真

为获得虚拟场景中车辆真实物理运动和交互性,提出一种基于开放式动力学引擎(ODE)的虚拟仿真平台集成方案.构建具有四自由度的汽车刚体动力学简化模型,分析其ODE特性及刚体连接机理,对车身和车轮之间的悬架系统进行分析,采用ODE中Hinge2进行模拟,分析其刚体动力学方程;基于Quest3D和VS2005进行刚体碰撞检测算法研究,构建一个能实现车辆刚体运动和碰撞检测的虚拟仿真平台,实时对车辆刚体动力学相关参数进行输出.经验证,该虚拟仿真系统具有良好的沉浸感、交互性和实用性.     

空气弹簧悬架的振动模型参数特性研究

目前空气弹簧已广泛应用于车辆悬架系统中。车辆动力学性能主要取决于悬架参教的匹配。悬架参教的精确性将直接影响车辆行驶的平稳性。基于热力学理论和气体状态方程式，建立了带附加气室的空气弹簧的统一力学模型，对其数学模型进行了求解，得出了其瞬态响应和稳态响应的理论值，求出了空气弹簧的自振频率和粘滞阻尼系数。为设计制造空气弹簧奠定了一定的理论基础。     

基于半车动力学模型的汽车被动悬架特性研究

基于系统动力学理论建立了含被动悬架的汽车半车动力学模型。在MATLAB／Simulink中,集成以白噪声一积分器产生的地面输入,及前、后悬架非簧栽质量模型和车体运动模型,最终实现被动悬架特性仿真的软件编程,为悬架参数的设计和优化提供了技术基础。     

Model development and parameter investigation of a column-type electric power steering system

In this paper, the performance of a column-type electric power steering (EPS) system and vehicle has been studied and a detailed mathematical model for the system has been established. Based on the mathematic model of the optimization design for steering feel, the parameters of the EPS system and vehicle on steering performance have been investigated.Moreover, the effects of the parameters on system stability have been analyzed and compared by the method of absolute sensitivity and the results are given in the end.     

An agentive focus may limit learning about complex causality and systems dynamics: A study of seventh graders' explanations of ecosystems

Agent-oriented pedagogies have been used in teaching concepts related to complex systems dynamics. However, little research has systematically explored the role of a strong agency-oriented focus on understanding of complex, dynamic ecological systems. This study analyzed seventh graders' (n = 216) explanations of a complex ecological scenario. The findings show that students were more likely to generate agentive than nonagentive explanations and students who adopted an agentive framing were least likely to understand the complex causal dynamics of two environmental scenarios, eutrophication in a pond and acid rain in a forest. Furthermore, students' initial inclination toward agency-oriented explanation on the assessment was predictive of their performance on a postassessment following an instructional opportunity to learn about ecosystems dynamics; a strong agency orientation corresponded to less complex interpretations of the dynamics of the ecosystems. The results suggest that a strongly agentive perspective may limit students' ability to learn complex systems dynamics and that the pedagogical advantages of agent-based approaches may not be without limitations.     

Social dynamics,university experiences,and graduates' job outcomes

In Canada, little attention has been paid to the extent to which job outcomes are the result of the human capital honed in university or of broader social dynamics. Combining the fundamental insights of status attainment and cultural reproduction theories with propositions of the college impact model, the current study examines the effects of cultural, social and human capital on four job outcomes two years after graduation from a Canadian university. Overall, it is found that variables measuring cultural and human capital have independent effects on job outcomes; however, the impact of social capital is minimal. The findings suggest that graduates' job outcomes are connected to broader social dynamics as well as to what they might learn in university.     

基于PID方法的汽车底盘集成控制研究

针对汽车底盘两系统集成控制由于控制器作用范围有限,使得控制结果难以满足汽车在全工况下整车性及安全性这一问题,本研究综合考虑了汽车的纵向、横向和垂向动力学对整车安全性的影响以及三者之间的关系,并基于14自由度的整车模型建立了PID算法的集成控制器,同时进行了仿真验证。仿真结果表明：多系统的集成控制优于两系统的集成控制,有效地提高了整车的综合性能。     

Teachers designing curriculum as professional development: A model for transformational science teaching

We have designed a model for transformational science teaching focused on linking theory and practice through curriculum decision making that has been the framework for professional development sessions for middle-grade science teachers during the past 5 years. Interviews with teachers revealed that their experiences with curriculum development were of significant value in making decisions concerning the design of classroom environments. As teachers reflected on current research about teaching and learning, in collaboration with university scientists and science educators, they were informed by theoretical perspectives which held implications for their practice. Curriculum development became a vehicle for professional development and school reform; however, it was vital that the teachers were in clear communication with their administrators and communities concerning reform issues. Students and teachers from schools implementing the model and from control sites were interviewed to determine the model's influence on instructional practices and student attitude and achievement in science. The five-phase model for transformational science teaching is discussed here, accompanied by teacher comments about tensions experienced at each phase. This discussion is followed by an analysis of teacher and student interview data that reveals teachers' use of instructional strategies and students' attitudes toward science. Results and analysis of student performance on a mandated end-of-grade science test are also included. From this evidence, we recommend a new design for professional development opportunities for teachers that engages them in decision making as they reflect about the connections between theory and practice and the value of continually testing, revising, and reevaluating curriculum and instructional issues. J Res Sci Teach 34: 773–789, 1997.     

基于Matlab的汽车动力传动扭转特性研究

通过Matlab建立某型汽车动力传动系13自由度扭转振动的分析模型,对其在临界转速下振动异常的现象加以分析研究,利用得到广泛使用的偏导数分析方法对该车在理想的无阻尼扭转振动下,系统的固有频率对转动惯量和扭转刚度的灵敏度进行了计算.从转动惯量和扭转刚度的角度分析出对固有频率最敏感的结构参数,从而以避开发动机的激励为目的对其进行修改,实现对固有频率的优化.并结合实验说明理论分析起到了很好的作用,同时还会降低厂家的修改设计费用.     

基于Trucksim的城市客车典型工况悬架动载荷提取

以城市客车为平台,分析其车辆动力学各子系统的型式和参数,根据现有积累的试验测试数据,采用Trucksim软件建立整车多体动力学模型。在此基础上,对城市客车制动、转弯、冲击及扭曲等典型运行工况进行动态模拟,提取出悬架系统各部件的受力情况,包括弹簧、减震器等。结果表明,城市客车在冲击工况下悬架整体受载最大。该仿真结果能够为城市客车有限元模型各典型工况下的载荷施加提供精确的输入,有利于提高受力分析的准确度。     

Counseling a Student Presenting Borderline Personality Disorder in the Small College Context: Case Study and Implications

This case study examines the dynamics and challenges associated with counseling a client experiencing borderline personality disorder in the small college institutional context. The work of counseling centers at small private institutions has been relatively unexplored in the extant college counseling literature. To help fill this gap, the current case study explores a counselor's work with a student at a private, Catholic women's college.     

Coping with abstraction in object orientation with a special focus on interface classes

One of the subjects that undergraduate students learning Object Oriented (OO) design find hard to apply is the construction of class hierarchies in general, and the use of interface classes in particular. The design process requires decomposition and reconstruction of problems in order to model software classes. The common attributes and behaviors are usually modeled using class inheritance except when the common behaviors do not belong to the same class hierarchy; in such case, an interface class is preferred. In order to be able to properly design, the designer has to demonstrate the abstraction abilities on various levels. In this study, we aimed at examining the students' demonstration of abstraction levels during design of class hierarchy in general, and whether or not they use interface classes in particular. The results of the study reveal that a majority of students were able to build a reasonable class hierarchy; however, many of them did not use interface classes as a tool for expressing common behaviors. Nevertheless, all of them could identify and choose the best solution for a particular problem among four different solutions, which included the use of interface class.     

Teachers’ classroom management self-efficacy,perceived classroom management and teaching contexts from beginning until mid-career

Teacher self-efficacy for classroom management is an important component of teachers' identity with implications for their teaching quality. Theoretically, it has been described that contextual variables play an important role for self-efficacy development and its consequences. However, little is known about the interrelationships of job resources and demands with teacher self-efficacy, and consequences for teachers' professional behaviors. We extend teacher self-efficacy research by drawing on the Job Demands-Resources model in examining contextual influences on developmental dynamics between classroom management self-efficacy and teacher-reported classroom management, from prior to qualifying as a teacher until mid-career. Participants were 395 primary and secondary Australian school teachers. Longitudinal structural equation models showed teachers’ classroom management self-efficacy positively related to aspects of their perceived classroom management, particularly during early career. Between early and mid-career, the positive relationship between self-efficacy and classroom management was moderated by early career excessive demands. Implications are outlined for teacher education and school administration.     

Power,Perceptions, and Relationships: A Model of Co-Teaching in Higher Education

Co-teaching has historically been used in K–12 education to provide students with disabilities access to general curriculum; therefore, much of the co-teaching literature has focused on the K–12 population. Research on collegiate co-teaching has been more limited and largely focused on the advantages and disadvantages of co-teaching, omitting important factors that affect relationships between partners. This qualitative study involved seven interviews of co-teachers of graduate and undergraduate classes in order to better understand interactions between college-level co-teaching dyads. Data analysis revealed themes of power and authority structures, dynamics of co-teaching relationships, and co-teachers' perceptions related to advantages of co-teaching, disadvantages of co-teaching, and student experiences. The researchers developed the Circular Model of Collegiate Co-Teaching, an original model to explain how these themes and subthemes are interrelated and affect each other. Specific best practices and new insights for collegiate co-teaching practice are discussed.     

基于多体动力学模型的汽车操稳性和平顺性虚拟教学实验

汽车操稳性和平顺性是车辆性能的重要指标,相应的实验是同济大学车辆工程专业本科生的一门重要教学实验内容,但由于设备与车辆限制,学生难以亲自动手。基于多体动力学原理,建立了包含车身、悬架、转向系统、轮胎以及动力系统在内的整车模型,基于该模型在教学实验的讲解过程中引入整车操稳性和平顺性的可视化虚拟实验,加强学生对实验原理和方法的理解。阐述了虚拟实验建模的原理、过程以及在教学实验中的应用,旨在激发学生对实验的兴趣,提高实验教学的质量。     

机动车智能驾考系统中车载网关的设计

针对机动车智能驾考系统的应用,设计了一种车载网关.网关采用基于ARMv7-M架构的STM32F107主处理器和CC2530无线协处理器组成双核处理器,辅以串口、CAN和以太网等外设接口电路共同搭建了硬件平台,并且以μC/OS-II操作系统、LwIP协议栈和ZigBee PRO协议栈为基础进行软件开发,能够实现车辆状态信息的采集和远程传输.实际应用表明,网关工作稳定、通用性高.     

Peer Supervision: Toward More Effective Training

This article discusses peer supervision as a vehicle for increasing student responsibility for self-assessment and peer assessment, and increasing independence and interdependence among students for professional and personal growth. The article also explains a model currently in use in a master's degree program in counseling. Included are rationale, definition, implementation, evaluation, and recommendations for use.     

一种电动汽车安全检测信息系统设计与实现

目前我国电动汽车行业高速发展,但在电动汽车安全检测标准与信息化管理方面,特别是电动汽车年审检测与相关检测标准管理,暂缺乏完善的信息管理系统。基于该现状并结合项目实际背景,设计开发一种电动汽车安全检测信息系统。该系统采用B/S模式,后台服务端采用Spring+SpringMVC+Mybatis+shiro技术框架,前端页面采用Jquery+EasyUI技术框架。该系统不仅能够以图形化界面生动展示数据库数据变化,还可极大提高电动汽车年审检测效率,同时具有运行稳定、易维护、高扩展性等特点。经实际测试证明,该系统运行效果良好。     

Faith,Work, and Praxis: A Process Model of Integration for Christian Student Affairs Administrators

The scholarship regarding faith integration practice has largely focused on faculty work; however, the field faces a paucity of data-supported approaches to understanding faith integration in the work lives of administrators. In this qualitative study, we developed a conceptual model that employs the concept of praxis to analyze the process by which mid-level student affairs administrators integrate their faith in their professional work lives. Findings show that the praxis model illuminates the sources of religious commitment that student affairs administrators drew upon when merging their faith commitments with their work lives. The model also highlights the introspective nature of faith integration, the power dynamics inherent in their interactions with students and superiors, and the individual and systemic change that resulted. Participants' religious habitus, reflective of personal experience as well as professional socialization, were both unconsidered and deliberate. Despite participants' claims that integration occurred organically and reflexively, intentionality before, during, and after integration situations was a hallmark of these exemplars' professional practice. The praxis model may be a valuable professional development tool for individuals, institutions, and graduate programs.