Since most of energy consumed by the telecommunication infrastructure is due to the Base Transceiver Station (BTS), switching off BTSs when traffic load is low has been recognized as an effective way of saving energy. In this letter, an energy saving scheme is proposed to minimize the number of active BTSs based on the space-time structure of traffic loads as determined by principal component analysis. Compared to existing methods, our approach models traffic loads more accurately, and has a much smaller input size. As it is implemented in an off-line manner, our scheme also avoids excessive communications and computing overheads. Simulation results show that the proposed method has a comparable performance in energy savings.

The aim of this research is to study the power energy cost reduction of the mobile telecom industry through the supervisor control and data acquisition (SCADA) system application during globalization and liberalization competition. Yet this management system can be proposed functions: operating monitors, the analysis on load characteristics and dropping the cost of management.

Workers involved in software projects are unlike those working on a production line in a manufacturing field usually engaged in plural work (that is, not only main development work but also various other work), concurrently. Such other work might put pressure on the schedule of the whole project. Therefore, to manage the whole project, not only main development work but also various other work should be dealt with as management objects and workers' workload should be taken into consideration (that is, who is doing what work at what workload at what time). This paper proposes a framework for workload management facilities for managing software projects. This framework proposes to relate not only main development work but also various other work and each work step within cooperative work to the workers. This paper also shows the behavior of the facilities by using an example and shows its usefulness based on the application of a prototype system. Using this system, users can assign work to workers by simulating workers' workload. These facilities help managers grasp workers' workload as well as help workers grasp their assigned work.