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Korotcenkov G.,Gwangju Institute of Science and Technology | Cho B.K.,Gwangju Institute of Science and Technology | Cho B.K.,GIST Inc
Progress in Crystal Growth and Characterization of Materials | Year: 2012

This review examines the influence of grain size on the thermal stability of nanostructured metal oxides by studying their structural parameters. The main consideration was focused on the behavior of SnO 2, the most studied and used metal oxide in the field of gas sensor design. It has been shown that a decrease of the grain size was accompanied by a deterioration of the structural stability of the gas sensing material; a change of grain size in the gas sensing material could occur during annealing and exploitation. The study provides an analysis of the reasons for the changes in gas sensor properties during thermal treatment. The effectiveness of different approaches used for stability improvement of metal-oxide structures were considered. In particular, various approaches such as preliminary high-temperature annealing of as-synthesized powders, optimization of the processes of synthesis and deposition, the use of 1-D structures, and metal-oxide doping with various additives were analyzed. © 2012 Elsevier Ltd. All rights reserved. Source

Lim J.,Pohang Light Source | Kim H.,GIST Inc | Park S.Y.,Pohang University of Science and Technology
Journal of Synchrotron Radiation | Year: 2014

The synchrotron-based hard X-ray nanotomography beamline, named 7C X-ray Nano Imaging (XNI), was recently established at Pohang Light Source II. This beamline was constructed primarily for full-field imaging of the inner structures of biological and material samples. The beamline normally provides 46 nm resolution for still images and 100 nm resolution for tomographic images, with a 40 μm field of view. Additionally, for large-scale application, it is capable of a 110 μm field of view with an intermediate resolution. © 2014 International Union of Crystallography. Source

Robinson J.T.,Harvard University | Jorgolli M.,Harvard University | Shalek A.K.,Harvard University | Yoon M.-H.,Harvard University | And 3 more authors.
Nature Nanotechnology | Year: 2012

Deciphering the neuronal codeĝ€"the rules by which neuronal circuits store and process informationĝ€"is a major scientific challenge. Currently, these efforts are impeded by a lack of experimental tools that are sensitive enough to quantify the strength of individual synaptic connections and also scalable enough to simultaneously measure and control a large number of mammalian neurons with single-cell resolution. Here, we report a scalable intracellular electrode platform based on vertical nanowires that allows parallel electrical interfacing to multiple mammalian neurons. Specifically, we show that our vertical nanowire electrode arrays can intracellularly record and stimulate neuronal activity in dissociated cultures of rat cortical neurons and can also be used to map multiple individual synaptic connections. The scalability of this platform, combined with its compatibility with silicon nanofabrication techniques, provides a clear path towards simultaneous, high-fidelity interfacing with hundreds of individual neurons. © 2012 Macmillan Publishers Limited. All rights reserved. Source

Isikdag U.,Beykent University | Isikdag U.,University of Central Lancashire | Zlatanova S.,GIST Inc | Zlatanova S.,Technical University of Delft | Underwood J.,University of Salford
Computers, Environment and Urban Systems | Year: 2013

Existing indoor navigation approaches such as navigation based on 2D geometries and pre-defined routing remain insufficient for many applications such as emergency response, delivery, utility maintenance and facility management. The insufficiencies caused by existing navigation approaches can be overcome by making use of the advanced semantic and geometric information included in intelligent building models. A key example of such models is Building Information Models (BIMs) which contain detailed geometric and semantic information about buildings. In fact, the BIMs' structure is very complex for facilitating navigation. This paper presents a new BIM Oriented Modeling methodology resulting in the definition of a new BIM based model (BO-IDM) dedicated for facilitating indoor navigation. The paper later describes the transformation of information from a standard BIM (IFC) into the new model (BO-IDM). The innovation aspects of BO-IDM can be summarized as follows: (i) it provides highly detailed semantic information for indoor navigation and (ii) it represents the non-geo-referenced structure and complex geometries of BIMs with ISO 19107 compliant representations. Therefore this model is well suited for indoor navigation. © 2013 Elsevier Ltd. Source

Embodiments of the present invention are directed to automated information-search and information-retrieval systems that provide information, on a continuous or periodic basis, to users or subscribers. In one embodiment of the present invention, information is gathered from a users computer, or from computers accessible from the users computer, on an essentially continuous basis in order to provide a database of information from which meaningful and focused search queries can be automatically constructed. The search queries are then employed to find, on behalf of the user or subscriber, current information useful to, and needed by, the user or subscriber.

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