China's High Performance Computer Standard Commission was established on March 28, 2007, under the guidance of the Science and Technology Bureau of the Ministry of Information Industry. It will prepare relevan... China's High Performance Computer Standard Commission was established on March 28, 2007, under the guidance of the Science and Technology Bureau of the Ministry of Information Industry. It will prepare relevant professional standards on high performance computers to break through the monopoly in the field by foreign manufacturers and vendors.……展开更多
Heterogeneous computing (HC) environment utilizes diverse resources with different computational capabilities to solve computing-intensive applications having diverse computational requirements and constraints. The ta...Heterogeneous computing (HC) environment utilizes diverse resources with different computational capabilities to solve computing-intensive applications having diverse computational requirements and constraints. The task assignment problem in HC environment can be formally defined as for a given set of tasks and machines, assigning tasks to machines to achieve the minimum makespan. In this paper we propose a new task scheduling heuristic, high standard deviation first (HSTDF), which considers the standard deviation of the expected execution time of a task as a selection criterion. Standard deviation of the ex- pected execution time of a task represents the amount of variation in task execution time on different machines. Our conclusion is that tasks having high standard deviation must be assigned first for scheduling. A large number of experiments were carried out to check the effectiveness of the proposed heuristic in different scenarios, and the comparison with the existing heuristics (Max-min, Sufferage, Segmented Min-average, Segmented Min-min, and Segmented Max-min) clearly reveals that the proposed heuristic outperforms all existing heuristics in terms of average makespan.展开更多
The Journal of Palaeogeography has three missions. The first is to encourage articles of Chinese palaeogeography to go abroad by the Journal, and let foreign readers know more about Chinese palaeogeography. The second...The Journal of Palaeogeography has three missions. The first is to encourage articles of Chinese palaeogeography to go abroad by the Journal, and let foreign readers know more about Chinese palaeogeography. The second is to encourage articles of foreign palaeogeography to come in China by the Journal, and let Chinese readers know more about foreign palaeogeography. The third is to promote the communication and cooperation between these two aspects, in order to make great contribution to the development and innovation of Chinese and international palaeogeography. Our journal has four advantages. The first is that the published articles are not restricted to one palaeo or three palaeos, but include many palaeos. The second is that most articles will be from China. The high academic level articles of Chinese palaeogeography going aborad will be an excellent contribution to international palaeogeography. The third is the close relationship between the scientific research and industrial practice. The fourth is that we have two journals, i.e. Journal of Palaeogeography (in Chinese) and Journal of Palaeogeography (in English). These two journals coordinate with each other and should promote the development and innovation of palaeogeography more effectively. So long as we can adhere to high academic standards, high English standards and high editorial standards, our journal will present our contribution to the Chinese and international palaeogeography.展开更多
文摘 China's High Performance Computer Standard Commission was established on March 28, 2007, under the guidance of the Science and Technology Bureau of the Ministry of Information Industry. It will prepare relevant professional standards on high performance computers to break through the monopoly in the field by foreign manufacturers and vendors.……
基金Project supported by the National Natural Science Foundation of China (No. 60703012)the National Basic Research Program (973) of China (No. 2006CB303000)the Heilongjiang Provincial Scientific and Technological Special Fund for Young Scholars (No. QC06C033),China
文摘Heterogeneous computing (HC) environment utilizes diverse resources with different computational capabilities to solve computing-intensive applications having diverse computational requirements and constraints. The task assignment problem in HC environment can be formally defined as for a given set of tasks and machines, assigning tasks to machines to achieve the minimum makespan. In this paper we propose a new task scheduling heuristic, high standard deviation first (HSTDF), which considers the standard deviation of the expected execution time of a task as a selection criterion. Standard deviation of the ex- pected execution time of a task represents the amount of variation in task execution time on different machines. Our conclusion is that tasks having high standard deviation must be assigned first for scheduling. A large number of experiments were carried out to check the effectiveness of the proposed heuristic in different scenarios, and the comparison with the existing heuristics (Max-min, Sufferage, Segmented Min-average, Segmented Min-min, and Segmented Max-min) clearly reveals that the proposed heuristic outperforms all existing heuristics in terms of average makespan.
文摘The Journal of Palaeogeography has three missions. The first is to encourage articles of Chinese palaeogeography to go abroad by the Journal, and let foreign readers know more about Chinese palaeogeography. The second is to encourage articles of foreign palaeogeography to come in China by the Journal, and let Chinese readers know more about foreign palaeogeography. The third is to promote the communication and cooperation between these two aspects, in order to make great contribution to the development and innovation of Chinese and international palaeogeography. Our journal has four advantages. The first is that the published articles are not restricted to one palaeo or three palaeos, but include many palaeos. The second is that most articles will be from China. The high academic level articles of Chinese palaeogeography going aborad will be an excellent contribution to international palaeogeography. The third is the close relationship between the scientific research and industrial practice. The fourth is that we have two journals, i.e. Journal of Palaeogeography (in Chinese) and Journal of Palaeogeography (in English). These two journals coordinate with each other and should promote the development and innovation of palaeogeography more effectively. So long as we can adhere to high academic standards, high English standards and high editorial standards, our journal will present our contribution to the Chinese and international palaeogeography.
