275 research outputs found
New structural model for GeO2/Ge interface: A first-principles study
First-principles modeling of a GeO2/Ge(001) interface reveals that sixfold
GeO2, which is derived from cristobalite and is different from rutile,
dramatically reduces the lattice mismatch at the interface and is much more
stable than the conventional fourfold interface. Since the grain boundary
between fourfold and sixfold GeO2 is unstable, the sixfold GeO2 forms a large
grain at the interface. On the contrary, a comparative study with SiO2
demonstrates that SiO2 maintains a fourfold structure. The sixfold GeO2/Ge
interface is shown to be a consequence of the ground-state phase of GeO2. In
addition, the electronic structure calculation reveals that sixfold GeO2 at the
interface shifts the valence band maximum far from the interface toward the
conduction band.Comment: 18 pages, 5 figures, and 2 table
New structural model for GeO2/Ge interface: A first-principles study
First-principles modeling of a GeO2/Ge(001) interface reveals that sixfold
GeO2, which is derived from cristobalite and is different from rutile,
dramatically reduces the lattice mismatch at the interface and is much more
stable than the conventional fourfold interface. Since the grain boundary
between fourfold and sixfold GeO2 is unstable, the sixfold GeO2 forms a large
grain at the interface. On the contrary, a comparative study with SiO2
demonstrates that SiO2 maintains a fourfold structure. The sixfold GeO2/Ge
interface is shown to be a consequence of the ground-state phase of GeO2. In
addition, the electronic structure calculation reveals that sixfold GeO2 at the
interface shifts the valence band maximum far from the interface toward the
conduction band.Comment: 18 pages, 5 figures, and 2 table
Software Defined Media: Virtualization of Audio-Visual Services
Internet-native audio-visual services are witnessing rapid development. Among
these services, object-based audio-visual services are gaining importance. In
2014, we established the Software Defined Media (SDM) consortium to target new
research areas and markets involving object-based digital media and
Internet-by-design audio-visual environments. In this paper, we introduce the
SDM architecture that virtualizes networked audio-visual services along with
the development of smart buildings and smart cities using Internet of Things
(IoT) devices and smart building facilities. Moreover, we design the SDM
architecture as a layered architecture to promote the development of innovative
applications on the basis of rapid advancements in software-defined networking
(SDN). Then, we implement a prototype system based on the architecture, present
the system at an exhibition, and provide it as an SDM API to application
developers at hackathons. Various types of applications are developed using the
API at these events. An evaluation of SDM API access shows that the prototype
SDM platform effectively provides 3D audio reproducibility and interactiveness
for SDM applications.Comment: IEEE International Conference on Communications (ICC2017), Paris,
France, 21-25 May 201
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