6 research outputs found
Assessing and Managing an Organization\u27s Green IT Maturity
Making information systems green and energy efficient is an important agenda item for many IT executives today. We present a framework of five categories (Work Practices, Office Environment, Data Centers, Procurement and Waste Management) and 64 indicators that can be customized by IT executives to assess their own organization\u27s green IT maturity. Findings based on a survey of large Korean firms using this framework are provided as an example, and guidelines for using the framework to achieve organization-specific green IT priorities are provided
Mechanisms with Referrals: VCG Mechanisms and Multilevel Mechanisms
We study mechanisms for environments in which only some of the agents are directly connected to a mechanism designer and the other agents can participate in a mechanism only through the connected agents' referrals. In such environments, the mechanism designer and agents may have different interest in varying participants so that agents strategically manipulate their preference as well as their network connection to avoid competition or congestion; while the mechanism designer wants to elicit the agents' private information about both preferences and network connections. As a benchmark for an efficient mechanism, we re-define a VCG mechanism. It is incentive compatible and individually rational, but it generically runs a deficit as it requires too much compensation for referrals. Alternatively as a budget-surplus mechanism, we introduce a multilevel mechanism, in which each agent is compensated by the agents who would not be able to participate without her referrals. Under a multilevel mechanism, we show that fully referring one's acquaintances is a dominant strategy and agents have no incentive to under-report their preference if the social welfare is submodular
Magnon Breakdown in a Two Dimensional Triangular Lattice Heisenberg Antiferromagnet of Multiferroic LuMnO3
The breakdown of magnons, the quasiparticles of magnetic systems, has rarely
been seen. By using an inelastic neutron scattering technique we report the
observation of spontaneous magnon decay in multiferroic LuMnO, a simple
two-dimensional Heisenberg triangular lattice antiferromagnet, with large spin,
S = 2. The origin of this rare phenomenon lies in the non-vanishing cubic
interaction between magnons in the spin Hamiltonian arising from the
noncollinear 120 spin structure. We observed all three key features of the
nonlinear effects as theoretically predicted: a roton-like minimum, a flat
mode, and a linewidth broadening, in our inelastic neutron scattering
measurements of single crystal LuMnO. Our results show that quasiparticles
in a system hitherto thought of as "classical" can indeed break down