μC/OS-Ⅱ实时操作系统中时间管理的改进

通过介绍μC/OS-Ⅱ实时操作系统中的时间管理功能,分析了系统中任务延时的优缺点.研究了一种基于硬件的延时机制,以提高系统的运行速度与实时性.在C8051F120单片机上进行测试,经实验得出此方法可以提高系统的实时性,减少系统的额外开销.     

BeehiveZ:一个开放的业务过程模型管理框架

随着面向服务架构、业务过程管理技术的推广应用,企业中用建模语言描述的业务过程模型越来越多,这些模型描述了企业核心的业务逻辑,是企业最宝贵的知识资产.为了更好地促进企业的发展,提升竞争力,需要将这些业务过程模型作为数据进行有效地管理、建立企业过程模型库,并支持对过程模型的存储、浏览、相似性度量、检索等操作和应用开发.提出了一个开放的业务过程模型管理框架--BeeHiveZ,阐述了BeeHiveZ的体系结构、关键技术及系统功能与操作等内容.BeeHiveZ现已在开源软件社区SourceForge. net上发布.     

Model Transduction for Triangle Meshes

This paper proposes a novel method, called model transduction, to directly transfer pose between different meshes, without the need of building the skeleton configurations for meshes. Different from previous retargetting methods, such as deformation transfer, model transduction does not require a reference source mesh to obtain the source deformation, thus effectively avoids unsatisfying results when the source and target have different reference poses. Moreover, we show other two applications of the model ...     

浅议中国平面设计中的国际趋同化与民族求异化

在设计面向全球化的今天,我们中国遭遇到了设计中的国际趋同化和民族求异化的紧张。怎样面对这种紧张是我们新一代的从事设计事业者必须思考的问题。如何在保持民族特色的同时,又能吸收外民族的优秀精华,使我们能够保持民族的强大活力呢?本论文所阐述的就是当今中国设计既要时刻的保持对国际化的敏锐嗅觉又要根植于自身民族文化特色,只有这样我们中国的设计才能带着自己的灵魂,走出自己的特色,在"自身传统"中"有机发展"。     

基于OpenGVS半潜船操作模拟器视景系统的研究

为了满足半潜船作业人员学习和培训的需要,有必要在航海模拟器大环境下研发半潜船操作模拟器仿真系统。以船舶静力学为基础,实现了半潜船装载重大件货物的过程的动态稳性计算,以Visual C++6.0和OpenGVS场景管理软件为开发平台,研制开发了半潜船操作模拟器应具备的视景系统。该仿真系统实现了视点的转移和跟踪,通过设置在半潜船的驾驶台、甲板及外部三个虚拟相机,实时动态显示半潜船各种运动的状态,同时实现了半潜船操作模拟器几个模块间的相互通信,取得了很好的效果。     

Simultaneous Localization and Mapping Using Rao-Blackwellized Particle Filters in Multi Robot Systems

In this paper we investigate the problem of Simultaneous Localization and Mapping (SLAM) for a multi robot system. Relaxing some assumptions that characterize related work we propose an application of Rao-Blackwellized Particle Filters (RBPF) for the purpose of cooperatively estimating SLAM posterior. We consider a realistic setup in which the robots start from unknown initial poses (relative locations are unknown too), and travel in the environment in order to build a shared representation of the latter. The robots are required to exchange a small amount of information only when a rendezvous event occurs and to measure relative poses during the meeting. As a consequence the approach also applies when using an unreliable wireless channel or short range communication technologies (bluetooth, RFId, etc.). Moreover it allows to take into account the uncertainty in relative pose measurements. The proposed technique, which constitutes a distributed solution to the multi robot SLAM problem, is further validated through simulations and experimental tests.     

纠错编码技术在无线模块中的应用

为了满足自动气象站对数据传输的要求,开发了一种加入纠错编码技术的无线模块。在不增加无线模块体积的前提下,通过软件来实现编解码。具体介绍了汉明码的原理和无线模块传输系统的结构,并重点阐述了无线模块的软硬件设计方案;最后对纠错编码技术应用前后的误码率进行了对比。实验数据表明,纠错编码的加入使误码率符合理论计算值,并有效地提高了无线模块的可靠性。     

Nonlinear Dimensionality Reduction by Local Orthogonality Preserving Alignment

We present a new manifold learning algorithm called Local Orthogonality Preserving Alignment (LOPA). Our algorithm is inspired by the Local Tangent Space Alignment (LTSA) method that aims to align multiple local neighborhoods into a global coordinate system using affine transformations. However, LTSA often fails to preserve original geometric quantities such as distances and angles. Although an iterative alignment procedure for preserving orthogonality was suggested by the authors of LTSA, neither the corresponding initialization nor the experiments were given. Procrustes Subspaces Alignment (PSA) implements the orthogonality preserving idea by estimating each rotation transformation separately with simulated annealing. However, the optimization in PSA is complicated and multiple separated local rotations may produce globally contradictive results. To address these difficulties, we first use the pseudo-inverse trick of LTSA to represent each local orthogonal transformation with the unified global coordinates. Second the orthogonality constraints are relaxed to be an instance of semi-definite programming (SDP). Finally a two-step iterative procedure is employed to further reduce the errors in orthogonal constraints. Extensive experiments show that LOPA can faithfully preserve distances, angles, inner products, and neighborhoods of the original datasets. In comparison, the embedding performance of LOPA is better than that of PSA and comparable to that of state-of-the-art algorithms like MVU and MVE, while the runtime of LOPA is significantly faster than that of PSA, MVU and MVE.     

对产品多功能设计的探讨——以老年人手机设计为例

本文主要探讨产品的多功能的合理性问题。首先明确了多功能产品的特点以及存在问题,然后以老年人手机设计为例,对老年人的手机态度调查和对现有多功能手机的合理性进行分析。文章从实例中总结出多功能产品的负面作用,指出产品功能适当设计的必要性。     

旱情预警几个主要技术问题的探讨

旱灾是我国主要的自然灾害之一。近年来,我国干旱灾害发生频繁,对经济社会造成的影响不断加剧。加强旱情监测,提高旱情综合评判能力,探索旱情预警方法等,显得十分必要和紧迫。目前,我国旱情监测工作相对薄弱,旱情预测预报起步较晚,旱情预警尚处于研究和探索阶段。本文结合吉林省旱情预警模型研究的有关成果,探讨预警指标、预测模型、预警综合指数等主要技术问题的创建思路,为旱情预警系统研究提供借鉴和参考作用。