Coordination components for collaborative virtual environments

This paper deals with the behavior of virtual environments from the collaboration point-of-view, in which actors (human or virtual beings) interact and collaborate by means of interdependent tasks. In this sense, actors may realize tasks that are dependent on tasks performed by other actors, while the interdependencies between tasks (through resource management and temporal relations) delineate the overall behavior of a virtual environment. Our main goal is to propose an approach for the coordination of those behaviors. Initially a generic study of possible interdependencies between collaborative tasks is presented, followed by the formal modeling (using Petri Nets) of coordination mechanisms for those dependencies. In order to implement such mechanisms, an architecture of reusable and pluggable coordination components is also introduced. These components are used in an implementation of a multi-user videogame. The presented approach is a concrete step to create virtual societies of actors that collaborate to reach common goals without the risk of getting involved in conflicting or repetitive tasks.     

Haptic Cooperative Virtual Workspace: Architecture and evaluation

The Haptic Cooperative Virtual Workspace (HCVW), where users can simultaneously manipulate and haptically feel the same object, is beneficial and in some cases indispensable for training a team of surgeons, or in application areas in telerobotics and entertainment. In this paper we propose an architecture for the haptic cooperative workspace where the participants can kinesthetically interact, feel and push each other simultaneously while moving in the simulation. This involves the ability to manipulate the same virtual object at the same time. A set of experiments carried out to investigate the haptic cooperative workspace is reported. A new approach to quantitatively evaluate the cooperative haptic system is proposed, which can be extended to evaluate haptic systems in general.     

等离子体协同纤维素酶对亚麻织物性能的影响

为了提高亚麻织物的染色性能,采用空气低温等离子体和等离子体与纤维素酶协同处理工艺对亚麻织物进行改性,并选用天然苏木染料对其进行染色,探讨了等离子体真空度、功率和处理时间以及协同工艺对亚麻织物染色性能的影响。结果表明,最佳的等离子体处理工艺为真空度0.02 MPa、功率90W、处理时间3min。等离子体与纤维素酶协同处理对亚麻织物苏木染料的染色性能优于单独使用等离子体或酶处理工艺,并且其摩擦牢度和耐皂洗牢度均比未处理和单独使用等离子体或酶处理工艺的亚麻织物高1级左右。     

Cooperative Game Model of Task Scheduling Grid Service Composition

针对网格服务组合的任务调度问题,基于其系统模型分析了系统模型中服务容器之间存在的合作博弈,给出了唯一纳什讨价还价解的存在性定理,并设计了求取该解的优化算法．实验结果表明,模型和算法的实验效果优于基于节点能力均分的调度算法。     

Pereformance and cooperative thresholds analysis for cooperative MIMO system

In this paper,the bit error rate (BER) performance of cooperative multiple input multiple output (MIMO) system is analyzed and two thresholds for decode-and-forward (DF) cooperative network are propose...     

基于目标对象的最佳中继协作频谱感知方案

提出了一种基于目标对象的最佳中继协作频谱感知方案(Pe-BRCS),通过最小化报告信道上的错误传输概率为目标选择最佳中继,以提高感知性能;为了降低计算复杂度,进一步提出了简化的最佳中继,协作频谱感知方案(simplified_BRCS)。仿真结果表明:相比传统SINR-BRCS方案,Pe_BRCS方案有效降低了报告信道上的错误传输概率,可以在增加较少计算复杂度的条件下提高感知性能;simplified_BRCS方案可以在不增加复杂度的情况下很好地近似Pe_BRCS方案。     

Difference thresholds for the perception of whole-body vertical vibration: dependence on the frequency and magnitude of vibration

When seeking to reduce vibration in transport it is useful to know how much reduction is needed for the improvement to be noticeable. This experimental study investigated whether relative difference thresholds for the perception of whole-body vertical vibration by seated persons depend on the frequency or magnitude of vibration. Relative difference thresholds for sinusoidal seat vibration were determined for 12 males at three vibration magnitudes and eight frequencies (2.5, 5, 10, 20, 40, 80, 160, 315 Hz) using the three-down-one-up method in conjunction with a two-interval-forced-choice procedure. The median relative difference thresholds were in the range 9.5% to 20.3%. There appeared to be a frequency-dependence at the lowest vibration magnitude, such that higher frequencies had higher difference thresholds. The relative difference thresholds depended on the vibration magnitude only at 2.5 and 315 Hz. The influence of both vibration frequency and vibration magnitude on the measured difference thresholds suggests that vision (at 2.5 Hz) and hearing (at 315 Hz) contributed to the perception of changes in vibration magnitude.     

高职教育协同创新的模式研究——以杭州职业技术学院为例

协同创新理论在高职教育体制机制创新、调动企业的积极性、明确政府的职能与职责、推动法律法规政策的完善等方面,不失为一条行之有效的途径．杭州职业技术学院依据协同创新理论,结合高职教育发展实际,选择合理的路径、制定科学的策略开发了高职教育协同创新——校企协同模式的发展模式．分析校企协同模式的内在机理、制度障碍、运行机制、发展规律及方向等,可为高职教育发展提供理论借鉴．     

人情社会中企业合作创新水平分析

影响合作创新的因素有创新主体的知识资源结构、管理者学习能力、组织学习能力和社会网络能力,以及合作创新主体所处的产业集群形成阶段和技术创新的类型。根据这些因素,构造一个合作创新水平评价模型。运用该模型对人情社会的合作创新环境进行分析,得出的结论是人情社会中的合作创新水平是低水平。进一步通过对合作创新系统演化的稳定性分析,得到的结论是人情社会低水平的合作创新环境具有相当的稳定性。     

新建本科院校英语口译课堂中合作学习教学模式的运用

随着社会的不断发展,高校英语口译课程的教学模式需要不断改革。合作学习作为一种创新的活动型教学模式,强调平等与合作,发挥学生的自主性、积极性、探究性,是英语口译课积极有效的值得推广的教学模式。