Electronics and Telecommunications Research Institute

Joong-Ki Park

Joong Bae Kim

Sung Hoon Kim

Kyeong Ho Lee

Hyun Kyu Cho

Chang Eun Lee

Byoung Youl Song

Seung-Woog Jung

Choul Soo Jang

Myung Chan Roh

Duk Joo Son

An apparatus for performing fault tolerance against a failure occurring during driving robot software components includes: a component executor for executing the robot software components, which are assigned with one thread from an operating system and have a same priority and cycle, by using the assigned thread; and an executor monitor for periodically monitoring the operation of the component executor and determining whether or not there is a failure in the robot software components executed by the component executor. The apparatus further includes: an executor manager for generating the component executor which is assigned with the robot software components having the same priority and cycle and, when the executor monitor determines that there is a failure in the execution of the robot software components, generating a new component executor.

Fault tolerance method and apparatus for robot software component

Disclosed is a method for data synchronization and update conflict resolution between mobile clients and a server in a mobile system which maintains consistency of data between the clients and the server and enables the clients to continuously perform an effective update operation with respect to objects of the server even in a clients' disconnection state by the mobile clients performing an independent update operation with respect to disjoint fragments and associated objects for a specified object using the structure of the objects and the meaning of applications and then performing the data synchronization and the conflict resolution between the clients and the server during a reconnection operation. The method includes a copy management step of copying data of a server-side DB into a client-side built-in DB and the server managing contents of copying and a copying time, a data synchronization step of synchronizing changed data between the mobile clients and the DB server with respect to a data change produced during the mobile clients' disconnection state in accordance with a request of the mobile clients after a reconnection of the mobile clients, and a conflict detection and resolution step of detecting an error that damages consistency of the data in the data synchronization process and resolving the detected error.

Method for data synchronization and update conflict resolution between mobile clients and server in mobile system

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Daejeon, South Korea

Joong-Ki Park