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Internet of Things is a paradigm that defines networking of various kinds of devices that are typically constrained, e.g., by limited amount of memory. Lightweight Machine to Machine (LWM2M) is a client-server protocol for managing such constrained devices. It is based on the Constrained Application Protocol (CoAP). Group communications remain undefined in LWM2M specifications, but can be supported...
In recent years, photovoltaic (PV) power generation is developing rapidly on account of its environment friendliness. However, the PV devices between different manufacturers could hardly interoperate because of different model and protocols they applied. This paper built the information model for PV power generation based on IEC61850, which is more normative and convenient for PV plant configuring...
We describe a new approach to minimize the power used by servers and computer room air conditioners (CRACs) in data centers by controlling them in an integrated way. This approach consists of air conditioning control using a new thermal model to keep inlet temperatures of servers under certain limits and allocation control of virtual machines (VMs) for servers with placement constraints to minimize...
High-speed and high-density RDIMMs (Registered Dual Inline Memory Modules) which are employed in server platforms consume significant amount of power, operating at close to 100 °C. Thus it is very important to predict operating temperature of high-power memory modules at the early stage of development procedure to determine which type of cooling solution to employ. In this paper, we propose an approach...
The prediction of flow and temperature in data center operation is of particular importance in creating better capacity utilization and lower capital costs. However, it is often a time- and computing-intensive task, and would be well served by more expeditious modeling methods than full Computational Fluid Dynamic (CFD) thermofluidic models. A software package named COMPACT (Compact Model of Potential...
This paper concerns the management of energy in data centers using a cyber-physical model that supports the coordinated control of both computational and thermal (cooling) resources. On the basis of the structure of the proposed model and practical issues related to the data center layout and distribution of information, we propose a hierarchical optimization scheme in which the higher level chooses...
We present a heat transfer model for data centers where real-time measurement data is used to reduce the complexity in the specifications of the model. As this modeling approach obtains its input directly from real-time measurements (in the form of boundary data), it is suitable for operational and real-time usage. Although the model is simpler than those based on the use of the Navier-Stokes equations...
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