IN 2012, the effects of the world financial crisis are still lingering.China’s economic rise continues to draw worldwide attention; and the appreciation of the RMB, the country’s large stockpiles of foreign reserves...IN 2012, the effects of the world financial crisis are still lingering.China’s economic rise continues to draw worldwide attention; and the appreciation of the RMB, the country’s large stockpiles of foreign reserves and its export strength are all perennial topics of debate among media commentators.With many countries around the world still ne- gotiating the rapids of economic recovery, will China avoid the tumult and chart its own smooth course of growth over the next couple of years?展开更多
2008年5月8日，全球闪存供货商SanDisk宣布推出Video HD高清视频存储卡。使用闪存卡为储存媒体的摄像机用户，将可依据录像时间选择最适当的储存媒体。首批上市的SanDisk Video HD存储卡系列将分别支持SDHC与Memory Stick PRO Duo格式...2008年5月8日，全球闪存供货商SanDisk宣布推出Video HD高清视频存储卡。使用闪存卡为储存媒体的摄像机用户，将可依据录像时间选择最适当的储存媒体。首批上市的SanDisk Video HD存储卡系列将分别支持SDHC与Memory Stick PRO Duo格式，存储卡上会清楚地标示摄像时间及储存容量。SanDisk存储卡与配件事业部资深产品营销经理Susan Park表示：“SanDisk Video HD产品线让选购新式录像机储存设备的工作更轻松。”展开更多
Low Earth Orbit （LEO） satellites networks can provide multimedia service and plays an increasingly important role in the exploitation of space. However, one of the challenges in LEO satellites networks is that the s...Low Earth Orbit （LEO） satellites networks can provide multimedia service and plays an increasingly important role in the exploitation of space. However, one of the challenges in LEO satellites networks is that the services are suffered from high symbol error, limited storage space and limited available energy. To analyze the performance of the service in LEO satellites networks, a model, based on differential game, is proposed for satisfying the QoS requirements of multimedia applications. The controller of our model is the transmitting rate and the object is to maximize the payoff depending on the error symbol rate, the available energy, the bandwidth and the process ability so as to guarantee the QoS service. In order to solve our built model, we use the Bellman theorem to make formulas on the trance of the optimal transmitting rate. Furthermore, simulation results verify that the service can be maximized by using our derived transmitting rate trance.展开更多
The rapid growth of streaming media applications on the Internet is proposing higher requirements on energy consumption and I/O performance of the storage systems.However,the optimized I/O requests from different init...The rapid growth of streaming media applications on the Internet is proposing higher requirements on energy consumption and I/O performance of the storage systems.However,the optimized I/O requests from different initiators will be mixed disorderly when they are reaching the storage system concurrently,which leads to increasing energy consumption.This paper proposes an energy-saving scheduling scheme based on I/O Stream(ES-IOS).The ES-IOS scheme can take the advantage of the I/O characteristics of streaming media and reorganize the mixed and disordered I/O requests into "streams".Technically,The ES-IOS scheme includes two main points,a priority-based weighted stream scheduling algorithm(PWSS) and a regression-fitting-based popularity prediction algorithm(RFPP).The PWSS algorithm can schedule the I/O streams in weighted queue based on priority to limit energy consumption.The priority of each stream is determined by its popularity.According to the I/O access records over a period,the RFPP algorithm can predict the popularity of each stream via regression fitting.Based on the popularities,the PWSS algorithm assigns more continuous service time to the hot streams and reversely less service time to the cold ones.Trace-driven experiments show that the ES-IOS scheme can reduce the energy consumption by 38%and enhance the I/O throughput by 27%approximately.展开更多
文摘IN 2012, the effects of the world financial crisis are still lingering.China’s economic rise continues to draw worldwide attention; and the appreciation of the RMB, the country’s large stockpiles of foreign reserves and its export strength are all perennial topics of debate among media commentators.With many countries around the world still ne- gotiating the rapids of economic recovery, will China avoid the tumult and chart its own smooth course of growth over the next couple of years?
文摘2008年5月8日，全球闪存供货商SanDisk宣布推出Video HD高清视频存储卡。使用闪存卡为储存媒体的摄像机用户，将可依据录像时间选择最适当的储存媒体。首批上市的SanDisk Video HD存储卡系列将分别支持SDHC与Memory Stick PRO Duo格式，存储卡上会清楚地标示摄像时间及储存容量。SanDisk存储卡与配件事业部资深产品营销经理Susan Park表示：“SanDisk Video HD产品线让选购新式录像机储存设备的工作更轻松。”
基金National Science Foundation Project of P.R.China，China Postdoctoral Science Foundation
文摘Low Earth Orbit （LEO） satellites networks can provide multimedia service and plays an increasingly important role in the exploitation of space. However, one of the challenges in LEO satellites networks is that the services are suffered from high symbol error, limited storage space and limited available energy. To analyze the performance of the service in LEO satellites networks, a model, based on differential game, is proposed for satisfying the QoS requirements of multimedia applications. The controller of our model is the transmitting rate and the object is to maximize the payoff depending on the error symbol rate, the available energy, the bandwidth and the process ability so as to guarantee the QoS service. In order to solve our built model, we use the Bellman theorem to make formulas on the trance of the optimal transmitting rate. Furthermore, simulation results verify that the service can be maximized by using our derived transmitting rate trance.
基金Supported by the National High Technology Research and Development Programme of China(No.2011AA01A102)
文摘The rapid growth of streaming media applications on the Internet is proposing higher requirements on energy consumption and I/O performance of the storage systems.However,the optimized I/O requests from different initiators will be mixed disorderly when they are reaching the storage system concurrently,which leads to increasing energy consumption.This paper proposes an energy-saving scheduling scheme based on I/O Stream(ES-IOS).The ES-IOS scheme can take the advantage of the I/O characteristics of streaming media and reorganize the mixed and disordered I/O requests into "streams".Technically,The ES-IOS scheme includes two main points,a priority-based weighted stream scheduling algorithm(PWSS) and a regression-fitting-based popularity prediction algorithm(RFPP).The PWSS algorithm can schedule the I/O streams in weighted queue based on priority to limit energy consumption.The priority of each stream is determined by its popularity.According to the I/O access records over a period,the RFPP algorithm can predict the popularity of each stream via regression fitting.Based on the popularities,the PWSS algorithm assigns more continuous service time to the hot streams and reversely less service time to the cold ones.Trace-driven experiments show that the ES-IOS scheme can reduce the energy consumption by 38%and enhance the I/O throughput by 27%approximately.
