This paper considers a reentrant scheduling problem on parallel primary machines with a remote server machine, which is required to carry out the setup operation. In this problem, each job has three operations. The fi...This paper considers a reentrant scheduling problem on parallel primary machines with a remote server machine, which is required to carry out the setup operation. In this problem, each job has three operations. The first and last operations are performed by the same primary machine, implying the reentrance, and the second operation is processed on the single server machine. The order of jobs is predetermined in our context. The challenge is to assign jobs to the primary machines to minimize the makespan. We develop a genetic algorithm(GA) to solve this problem. Based on a simple strategy of assigning jobs in batches on the parallel primary machines, the standardized random key vector representation is employed to split the jobs into batches. Comparisons among the proposed algorithm, the branch and bound(BB) algorithm and the heuristic algorithm, coordinated scheduling(CS), which is only one heuristic algorithm to solve this problem in the literature, are made on the benchmark data. The computational experiments show that the proposed genetic algorithm outperforms the heuristic CS and the maximum relative improvement rate in the makespan is 1.66%.展开更多
Call drop is one of the most common problems encountered by ISP with PSTN access. In this pacer several reasons on server side that cause modem disconnection are analyzed. In the last part of this paper, some solution...Call drop is one of the most common problems encountered by ISP with PSTN access. In this pacer several reasons on server side that cause modem disconnection are analyzed. In the last part of this paper, some solutions are Put forward to reduce call drop rate.展开更多
This paper consists of a prototype for a data acquisition system connected via wireless network for data storage on a remote server. This study presents the acquisition board and the operating principle of the whole s...This paper consists of a prototype for a data acquisition system connected via wireless network for data storage on a remote server. This study presents the acquisition board and the operating principle of the whole system developed starting at the measurement of data up to its storage on a remote server. Using a remote server connected to the Internet implies the possibility of analysis, manipulation and control of such data from anywhere in the world.展开更多
基金Supported by National Natural Science Foundation of China(No.61271374)Beijing Natural Science Foundation(No.4122068)
文摘This paper considers a reentrant scheduling problem on parallel primary machines with a remote server machine, which is required to carry out the setup operation. In this problem, each job has three operations. The first and last operations are performed by the same primary machine, implying the reentrance, and the second operation is processed on the single server machine. The order of jobs is predetermined in our context. The challenge is to assign jobs to the primary machines to minimize the makespan. We develop a genetic algorithm(GA) to solve this problem. Based on a simple strategy of assigning jobs in batches on the parallel primary machines, the standardized random key vector representation is employed to split the jobs into batches. Comparisons among the proposed algorithm, the branch and bound(BB) algorithm and the heuristic algorithm, coordinated scheduling(CS), which is only one heuristic algorithm to solve this problem in the literature, are made on the benchmark data. The computational experiments show that the proposed genetic algorithm outperforms the heuristic CS and the maximum relative improvement rate in the makespan is 1.66%.
文摘Call drop is one of the most common problems encountered by ISP with PSTN access. In this pacer several reasons on server side that cause modem disconnection are analyzed. In the last part of this paper, some solutions are Put forward to reduce call drop rate.
文摘This paper consists of a prototype for a data acquisition system connected via wireless network for data storage on a remote server. This study presents the acquisition board and the operating principle of the whole system developed starting at the measurement of data up to its storage on a remote server. Using a remote server connected to the Internet implies the possibility of analysis, manipulation and control of such data from anywhere in the world.
