Smooth interpolation on homogeneous matrix groups for computer animation

INTRODUCTION Homogeneous matrices are matrices used to represent geometric transformations for homogene- ous coordinates. Because they provide uniform rep- resentation for various transformations, they are widely used in the computer graphics community. As a homogeneous matrix corresponds to a geometric transformation, a curve on the set of homogeneous matrices can be taken as a piece of motion. Thus interpolation between those matrices is of high in- terest in many applications such as c…     

Experimental validation of sound quality simulation and optimization of a four-cylinder diesel engine

A novel sound quality simulation approach was proposed to optimize the acoustic performance of a four-cylinder diesel engine. Finite element analysis, single-input and multiple-output technology, flexible multi-body dynamics, and boundary element codes were used to acquire the hexahedron-element model, experimental modal frequencies, vibration velocities, and structurally radiated noise of the block, respectively. The simulated modal frequencies and vibration velocities agreed well with the experimental data, which validated the finite-element block. The acoustic response showed that considerable acoustic power levels existed in 1500–1900 Hz and 2300–2800 Hz as the main frequency ranges to optimize the block acoustics. Then, the optimal block is determined in accordance with the novel approach, which reduces the overall value, high-frequency amplitudes, and peak values of acoustic power; thus, the loudness, sharpness, and roughness decline to make the sound quieter, lower-pitched, and smoother, respectively. Finally, the optimal block was cast and bench-tested. The results reveal that the sound quality of the optimal-block engine is substantially improved as numerically expected, which verifies the effectiveness of the research approach.     

Rebooting assessment. Exploring the challenges and benefits of shifting from pen-and-paper to computer in summative assessment

A systematic review of 34 articles published within the last 20 years, that explored the implications of increased use of computer-based summative assessments revealed six key themes. Specifically: shifts in assessment design; impact on teachers; variation in computer familiarity; student experience; logistics and infrastructure; and hardware and software issues. Findings relating to comparability of results between the assessment modes are also discussed. This review evaluates the computer-based assessment (CBA) literature to identify the advantages and challenges for introducing CBA within educational institutions. The findings of this review will be of particular interest to those affected by a steady trend towards the introduction of CBA affecting both teachers and students. The review also provides a coherent summary of the existing literature in this rapidly changing field for researchers.     

数字化时代的新闻传播类专业计算机课程教学体系研究

随着媒介数字化的不断深入发展,对新闻传播学学科内各专业计算机技术应用教学的要求也越来越高,国内各高校近年来也对该教学与实验内容作了很大的改革,新闻传播类专业应结合本校本院教学实际,建立一套以数字媒体技术与应用课程为核心的教学与实验方面的新体系,以带动整个新闻传播学类专业计算机教学与实验的发展。该文主要围绕计算机课程教学与实验的主体内容、数字媒体技术与应用课程的定位及目前国内高校的开设情况、其他相关问题及其探讨等方面进行阐述。     

实现水下声波散射的时域有限差分一致性表达式的改进算法

In this paper, a set of unified finite-difference time-domain (FDTD) formulae are presented. These formulae are applicable to underwater sound scattering from various objects with a finite acoustic impedance, either with or without shear strains. A major improvement has been made to the FDTD algorithm to remove most of the loop operations. This makes the finite-difference field computation very efficient and, more importantly, suitable for the implementation of distributed parallel computing. Other advantages of the new algorithm include the ease in modeling objects having complicated shapes. Numerical experiment results are presented to show the effectiveness of the proposed method.     

An evaluation of a professional learning network for computer science teachers

This paper describes and evaluates aspects of a professional development programme for existing CS teachers in secondary schools (PLAN C) which was designed to support teachers at a time of substantial curricular change. The paper’s particular focus is on the formation of a teacher professional development network across several hundred teachers and a wide geographical area. Evidence from a series of observations and teacher surveys over a two-year period is analysed with respect to the project’s programme theory in order to illustrate not only whether it worked as intended, by why. Results indicate that the PLAN C design has been successful in increasing teachers’ professional confidence and appears to have catalysed powerful change in attitudes to learning. Presentation of challenging pedagogical content knowledge and conceptual frameworks, high-quality teacher-led professional dialogue, along with the space for reflection and classroom trials, triggered examination of the teachers’ own current practices.     

日本高校多媒体计算机网络实验室建设与启示

本文从多媒体计算机网络实验室的设计理念、设备配置和技术支持等方面介绍了日本高校多媒体计算机网络实验室的现状,并对中日多媒体计算机网络实验室设施的应用模式进行横向比较,以借鉴学习日本的先进技术、设计理念及管理方法。     

Developing the next generation of diverse computer scientists: the need for enhanced,intersectional computing identity theory

This theoretical paper explores the need for enhanced, intersectional computing identity theory for the purpose of developing a diverse group of computer scientists for the future. Greater theoretical understanding of the identity formation process specifically for computing is needed in order to understand how students come to understand themselves as computer scientists. To ensure that the next generation of computer scientists is diverse, this paper presents a case for examining identity development intersectionally, understanding the ways in which women and underrepresented students may have difficulty identifying as computer scientists and be systematically oppressed in their pursuit of computer science careers. Through a review of the available scholarship, this paper suggests that creating greater theoretical understanding of the computing identity development process will inform the way in which educational stakeholders consider computer science practices and policies.     

师范生“数字化学习资源设计与制作”的课程建设研究

以一所师范大学面向师范生开设的"多媒体课件制作"课程为切入点,结合我国中小学教师教育技术能力标准,对课程从整体定位、内容体系、资源建设和成果评价等四个维度进行改革,经过三轮的教学实践,初步完成了更新性课程——"数字化学习资源的设计与制作"的课程建设任务。     

化工过程对象模型视景仿真的设计与OpenGL实现

运有开放式三维图形软件OpenGL和面向对象的方法,提出了在微机环境下设计化工过程培训仿真器中的视景仿真的设计思想和设计步骤,其中包括系统构成、对象模型的建立、视景的生成以及动画表现等,并给出了具体的实现方法。     

吉布斯效应在信号处理课程教学中的仿真分析

为帮助学生更直观地理解信号处理中出现的吉布斯效应,借助于计算分析软件MATLAB对信号处理中的信号分解与合成以及滤波器设计中出现的吉布斯现象进行了仿真,分析并探讨了吉布斯效应产生的原因及减少效应影响的方法。仿真结果可更加直观和深刻地认识吉布斯效应,对信号分析与系统设计有着重要的作用。     

供配电计算机模拟演示系统的设计与实现

提出一种供配电计算机模拟演示系统，通过设计系统的硬件和软件，给出演示功能和监控功能的实现方法，并说明了系统的特点。     

纤维滤料新模型的阻力数值模拟研究

利用流体力学开源代码OpenFOAM验证了单圆柱体周围的流体特性（包括流型和阻力）,表明Open-FOAM能够用于模拟低Re数流,并发现Shaw的解析解是斯托克斯悖论的一种解.通过对纤维滤料进行试验以及对Tronville-Rivers二维纤维随机分布滤料新模型的阻力特性进行数值模拟,发现Kuwabara模型比Hap-pel模型更能精确预测纤维滤料的阻力,而且试验阻力值介于纤维表面为无滑移和全滑移边界条件下的数值模拟值之间.     

浅谈大学生学科竞赛之“全国计算机仿真大奖赛”的教学体会

大学生学科竞赛能够培养学生的创新意识和实践动手能力,同时也是大学教师教学业绩和大学教学质量评估的要素。然而,优秀的学科竞赛成绩离不开大学教师的教学与指导。论文以“全国计算机仿真大奖赛”为例,分析了该竞赛的命题特点,以及参赛学生需要具备的知识技能,并分享了该竞赛的组织、培训、准备等方面的教学体会与经验,对各大学在组织该竞赛的培训与教学等方面具有重要的指导意义。