Electronics and Telecommunications Research Institute

Korea Advanced Institute of Science and Technology

Hyundai Motor Company

University of California

Kia Motors Corporation

Eun Seon Cho

Chan Yong Lee

Nam Hoon Park

Byung Han Ryu

Hong Soog Kim

Hyeon Ju Oh

Byung-Han Ryu

Dong Seung Kwon

Kyung Moon Lee

Dong Hoon Nam

Yeon Seung Shin

Young Jin Cho

Jeffrey J Urban

Hyung-Sub Kim

Shaul Aloni

Anne M Ruminski

Dong Ju Han

Byeongsoo Shin

Hyung Wan Do

Hoonmo Park

A hydrogen storage composite material includes: a graphene oxide framework provided as a porous structure and having an average pore diameter of 1 to 2 nm; and the graphene oxide framework is impregnated with a metal hydride, the graphene oxide framework comprises: a graphene oxide; and a linker connecting the graphene oxide.

Hydrogen storage composite material and manufacturing method thereof

Disclosed is a method for preparing a reduced graphene oxide-magnesium nanocrystal composite. The method includes contacting graphene oxide with a first reducing agent to prepare a reduced graphene oxide, and co-reducing the reduced graphene oxide and a precursor of magnesium in the presence of a second reducing agent to prepare a reduced graphene oxide-magnesium nanocrystal composite, wherein by adjusting the amount of the first reducing agent in contact with the graphene oxide, the size of the magnesium nanocrystals in the composite may be controlled.

Method for preparing reduced graphene oxide-magnesium nanocrystal composite

Various embodiments of the invention describe an environmentally stable, and exceptionally dense hydrogen storage (6.5 wt % and 0.105 kg H/L in the total composite, 7.56 wt % in Mg) using atomically thin and gas-selective reduced graphene oxide sheets as encapsulants. Other approaches to protecting reactive materials involve energy intensive introduction of considerable amounts of inactive, protective matrix which compromises energy density. However, these multilaminates are able to deliver exceptionally dense hydrogen storage far-exceeding 2020 DOE target metrics for gravimetric capacity (5.5 wt %), and ultimate full-fleet volumetric targets (0.070 kg H/L) for fuel cell electric vehicles. Methods of stabilizing reactive nanocrystalline metals in zero-valency also has wide-ranging applications for batteries, catalysis, encapsulants, and energetic materials.

Graphene oxide/metal nanocrystal multilaminates the atomic limit for safe, selective hydrogen storage

A method in which a base station manages information for D2D communication, which is direct communication between terminals, is provided. The base station receives a first message that requests a configuration of a first open discovery service that searches for a first terminal and at least one terminal to perform D2D communication. The base station determines whether a resource to allocate to the first terminal exists. The base station stores first information for providing the first open discovery service based on the determination result.

Method and apparatus for managing information for direct communication between devices

Disclosed are a method and apparatus for managing a cloud virtual base station system. The present invention includes setting initial resources and driving or downloading an execution file or environment file of the cloud virtual base station system and monitoring or managing a state for a failure, radio resources, or the execution file or the environment file of the cloud virtual base station system.

Method and apparatus for controlling cloud virtual base station

A method and apparatus for managing a cloud virtual base station system are disclosed. The present invention comprises configuring an initial resource and reconfiguring the resource to add or remove a resource of an execution file of the cloud virtual base station system, monitoring an error of the cloud virtual base station system, a wireless resource, a status of the execution file, or a configuration status of the reconfigured resource, managing configuration information of a list of software added or removed during an operation, controlling the cloud virtual base station system in a predetermined specific mode, managing hardware information, file information, or control information of each module of the cloud virtual base station system, and managing the execution file for each module of the cloud virtual base station system by adding or removing the predetermined specific mode initially or during an operation.

Method and apparatus for controlling resource of cloud virtual base station

A method of providing a physical cell identity (PCI) assignment by a management server for small-cell base stations (BSs) in a heterogeneous network environment includes setting a location coordinate and radius for the small-cell BSs; grouping every first preset number of small-cells together to define one femto zone; constructing a location map for each femto zone; grouping every second preset number of femto zones to define one femto group; and constructing a location map for each femto group.

Method and system for providing physical cell identity assignment in heterogeneous networks

The present invention relates to a short range wireless communication device for providing an application service based on an area. In particular, an apparatus for providing an application service based on an area in a small cell including a femtocell base station or a WiFi Access Point, the apparatus including a communication unit to receive a list of application services from an Application Service Provisioning Server, select and download at least one application service from the received list, an application service database to store the at least one downloaded application service, a service controller to install the at least one downloaded application service, or uninstall an installed application service, a user equipment access detector to detect a user equipment entering or exiting a service area, and a user equipment database to store an identifier and information of the user equipment entering or exiting the service area.

Apparatus and method for providing application service based on area

An apparatus and method for assigning a Physical Cell Identity (PCI) of a Home eNodeB (HeNB) are provided. The apparatus may distribute PCIs into a plurality of PCI groups, and may enable a PCI group to be assigned to a cell so that the assigned PCI group may be different from a PCI group assigned to a neighboring cell, and that an unassigned PCI in the assigned PCI group may be assigned to an HeNB within a single cell.

Apparatus and method for assigning PCI of home base station

Provided are a method and an apparatus for power saving of a femto base station operating as a CSG cell in a wireless communication system. A femto base station according to an exemplary embodiment of the present invention includes: a reception unit receiving signals from adjacent second femto base stations; a transmission unit transmitting signals to second femto base stations, and a control unit controlling to be transitioned to an active mode when a mode transition command is received from at least one second femto base station while operating in a sleep mode, in a wireless communication system constituted by a plurality of femto base stations using automatic neighbor relation (ANR).

Method and apparatus for power saving of femto base station using ANR function in wireless communication system

A Software Communications Architecture (SCA)-based software-defined radio (SDR) terminal and a reconfiguration method thereof are provided. The SDR terminal includes a software module including first and second hardware modules that are programmable and a memory storing at least one wireless access application; and a software module including a reconfiguration core framework that perform a service mode switch using the wireless access application, wherein, if a service mode switch from a first service mode to a second service mode occurs, the SDR terminal installs a wireless access application corresponding to the second service mode in one of the first and second hardware modules.

SDR terminal and reconfiguration method

Provided is a method and apparatus for avoiding a collision of a preamble in a base station. When a new base station is installed in a mobile communication system and in this instance, an exclusive preamble using a contention-free scheme is employed to avoid a preamble collision, at least one of a code parameter, a time parameter, and a frequency parameter used in a preamble of the new base station may be set to be different from a code parameter, a time parameter, and a frequency parameter used in a preamble of a neighboring cell, whereby it is possible to manage a random access preamble without causing a collision between cells.

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Daejeon, South Korea

Eun Seon Cho