In this paper, we quantify performance gain achieved if SISO system is replaced with 4x4 MIMO in WLAN setting compatible with IEEE 802.11n standard. We compare throughput and power savings in MIMO by taking field measurements at various indoor locations. Measurements are validated with simulations that include different IEEE TGn channel models. For comparison between MIMO and SISO, we select th...

We propose a new design principle for the systems community. “Do nothing well” in addition to “make the common case fast”. This means designing for power savings as well as performance gains. The key to saving power is harnessing idleness; understanding and managing idleness as a first-class characteristic of workloads. In this paper we study the idleness in a diverse range of workloads. We sho...

In this paper we propose a power-saving strategy for accessing the Internet from a mobile computer. Firstly, we measure the power consumption of a mobile computer that uses a TCP connection to send/receive data from the Internet. These measurements indicate that, by adopting TCP, the power consumption is negatively affected by the congestion in the fixed network. To solve this problem we extend...

A techno-economic evaluation for efficient use of energy in a large scale industrial plant of methanol is carried out. This assessment is based on integration of a gas turbine with an existing plant of methanol in which the outlet gas products of exothermic reactor is expanded to power generation. Also, it is decided that methanol production rate is constant through addition of power generation...

Saving power in datacenter networks has become a pressing issue as the networks tend to consume steady power even when many servers may be idle during periods of low activity. While in operation, ElasticTree and CARPO can save power consumed by a fat-tree network by using sleep mode, where some components such as ports and switches are turned off when traffic demand in the network is relatively...

Rising power consumption of data centers is a topic of great concern and therefore several power saving technologies exist. This paper describes the idea of a data center overall power saving and controlling strategy, allowing the data center to enter optimized minimum power states but also to control its own power consumption to apply demand response management. Therefore, the degrees of freed...

Leakage power in data cache memories represents a sizable fraction of total power consumption, and many techniques have been proposed to reduce it. Previous techniques put unused lines for example to drowsy state or switch them off completely (cache decay) in order to save power. Our idea is to adaptively select mostly used cache lines. We found that this can be achieved automatically by using ...

The power management of ICT systems, that is, data processing (Dp) and telecommunication (Tlc) systems, is becoming a relevant problem in economical terms. Dp systems totalize millions of servers and associated subsystems (processors, monitors, storage devices, etc.) all over the world that need to be electrically powered. Dp systems are also used in the government of Tlc systems, which, beside...

This paper presents the design and implementation methodology of some low power programmable FIR filtering IP cores targeting SoRC and compares their performance in term of area, power and speed. The paper analyzes the dynamic power consumption of the IP cores in the fabric of Field Programmable Gate Arrays (FPGAs). The target device is Virtex family (xcv1000). The cores are technology independ...

1. Introduction Mitsubishi Electric offers solutions centered on security , under the brand name DIGUARD, for various customer problems in buildings, factories, public facilities , and so on. As an example, this paper describes the development of an energy saving system that coordinates security and lighting equipment. In recent years, as evidenced by revisions to the Energy Saving Law and Toky...