It is necessary for various users to intercommunicate with each other in multipoint communications. Each users' image and voice can be reached at others' terminals. As to the signs of image, many windows can b...It is necessary for various users to intercommunicate with each other in multipoint communications. Each users' image and voice can be reached at others' terminals. As to the signs of image, many windows can be opened on a termined and the participarts' images can be on the screen as well. However, as to voice, no matter how fast the speed of transmission is, it is common for listerners to find the great distinctions, between the voice of communicanons and that of face-to-face communications, which debases the quality of multipoint communications. Therefor, it is vital important to take measures to solve the mixed voices of multipoint communications during a high quality system of multipoint communications. In this article, we try to solve the trouble of voice in speech mixing. The theory of queue is applied in the analysis of voice data of multipoint communications, which forms the mathematic model. From the model, the equations of estate transfer will be obtained. And then through computer simulation, we get the results of equation and data we wanted are presented as well. With the model of queue, massive experiments and curvilinear regression, the relation among the scale of communication, the threshold of working, and the queue buffer is found. Therefore the expansibility problem of voice data of multipoint communications with real-time speech mixing is solved in the last part of this paper.展开更多
在移动自组网络中,节点的移动或是无线连接的中断会引起频繁的网络分割.因此,访问节点并获取相应的数据是相当困难的.通过理论和统计分析得到特定运动模型对应的网络分割模式,建立了网络分割模式与数据复制有效性之间的联系,推导出了理...在移动自组网络中,节点的移动或是无线连接的中断会引起频繁的网络分割.因此,访问节点并获取相应的数据是相当困难的.通过理论和统计分析得到特定运动模型对应的网络分割模式,建立了网络分割模式与数据复制有效性之间的联系,推导出了理想复制方法在特定网络环境下能够获得的数据可用性的上限,也指出纯随机复制方法可提高数据可用性.基于上述分析,提出了一种新的数据复制方法RICMAN(replication in intermittently connected mobile ad hoc networks)来提高断续性连接移动自组网络的数据可用性.该方法将所需数据以副本的形式复制到一系列拓扑结构相对稳定和资源充足的特定节点上,为处于同一分区的节点提供数据服务.副本的分布和更新基于半概率性数据分发协议实现.此协议能够识别可能的跨越多个网络分区的运动节点,由这些节点传播数据及其更新,从而在断续性连接网络中最大化数据传输.为了保持副本的一致性,该方法使用一种弱一致性模型--最终一致性模型,以确保所有的更新最终在有限的延迟内传送到所有的副本处.仿真结果显示,RICMAN方法能够以较小的开销获取较高的数据可用性,经过优化后,数据可用性仅比理想上限低10%～15%.展开更多
In this paper ,the conception model of software component has been analyzed and discussed.By utilizing ideas of OO and extending them,the author proposes an improved descriptive method based on OWE(OBJECT WITH EVENT)f...In this paper ,the conception model of software component has been analyzed and discussed.By utilizing ideas of OO and extending them,the author proposes an improved descriptive method based on OWE(OBJECT WITH EVENT)for software component. Finally,from the view of software reuse,the methods of identify and select reusable components from software components reopository are presented,by which the software productivity can be increased repidly.展开更多
文摘It is necessary for various users to intercommunicate with each other in multipoint communications. Each users' image and voice can be reached at others' terminals. As to the signs of image, many windows can be opened on a termined and the participarts' images can be on the screen as well. However, as to voice, no matter how fast the speed of transmission is, it is common for listerners to find the great distinctions, between the voice of communicanons and that of face-to-face communications, which debases the quality of multipoint communications. Therefor, it is vital important to take measures to solve the mixed voices of multipoint communications during a high quality system of multipoint communications. In this article, we try to solve the trouble of voice in speech mixing. The theory of queue is applied in the analysis of voice data of multipoint communications, which forms the mathematic model. From the model, the equations of estate transfer will be obtained. And then through computer simulation, we get the results of equation and data we wanted are presented as well. With the model of queue, massive experiments and curvilinear regression, the relation among the scale of communication, the threshold of working, and the queue buffer is found. Therefore the expansibility problem of voice data of multipoint communications with real-time speech mixing is solved in the last part of this paper.
文摘在移动自组网络中,节点的移动或是无线连接的中断会引起频繁的网络分割.因此,访问节点并获取相应的数据是相当困难的.通过理论和统计分析得到特定运动模型对应的网络分割模式,建立了网络分割模式与数据复制有效性之间的联系,推导出了理想复制方法在特定网络环境下能够获得的数据可用性的上限,也指出纯随机复制方法可提高数据可用性.基于上述分析,提出了一种新的数据复制方法RICMAN(replication in intermittently connected mobile ad hoc networks)来提高断续性连接移动自组网络的数据可用性.该方法将所需数据以副本的形式复制到一系列拓扑结构相对稳定和资源充足的特定节点上,为处于同一分区的节点提供数据服务.副本的分布和更新基于半概率性数据分发协议实现.此协议能够识别可能的跨越多个网络分区的运动节点,由这些节点传播数据及其更新,从而在断续性连接网络中最大化数据传输.为了保持副本的一致性,该方法使用一种弱一致性模型--最终一致性模型,以确保所有的更新最终在有限的延迟内传送到所有的副本处.仿真结果显示,RICMAN方法能够以较小的开销获取较高的数据可用性,经过优化后,数据可用性仅比理想上限低10%～15%.
文摘In this paper ,the conception model of software component has been analyzed and discussed.By utilizing ideas of OO and extending them,the author proposes an improved descriptive method based on OWE(OBJECT WITH EVENT)for software component. Finally,from the view of software reuse,the methods of identify and select reusable components from software components reopository are presented,by which the software productivity can be increased repidly.
