Samsung Sds Co., Ltd.

Samsung Electronics Co., Ltd.

Young Yoo Heo

Jun Tae Kim

Kyu Sang Lee

Kwang Cheol Lee

Kyung Jin Kim

Jung Eun Lee

Sang Ji Bae

Ki Woon Sung

Chang Suk Yoon

Han Saem Seo

Myoung-Ki Ahn

Young Woon Kwon

Jin-Woo Ahn

Young-Gwon Kim

Tae-yong Jo

Tae-Jun Ahn

Sang Jun Kang

A blockchain based data management method performed by a computing device according to an embodiment of the present disclosure includes recording a deletion event for off-chain data and time information of the deletion event in a blockchain network, and selectively deleting the off-chain data based on a validity verification result calculated for the time information, wherein the validity verification result is calculated using a time-consensus algorithm of the blockchain network.

Method and apparatus for managing data based on blockchain

A blockchain data recording method includes determining a recording type as one of an on-chain type and an off-chain type according to a target data to be recorded in a blockchain, transmitting a first transaction proposal for recording the target data in a blockchain node configured to store an on-chain data on a blockchain to the blockchain node when the recording type is an on-chain type, and recording the target data in a storage node provided to store an off-chain data, and transmitting a second transaction proposal for storing recording information of the target data in the blockchain to the blockchain node when the recording type is an off-chain type.

Blockchain data recording method and apparatus thereof

A data management system according to an embodiment of this invention includes a blockchain node configured to store on-chain data on blockchain and a service server, upon receiving a service request associated with the original data from a client, i) accessing off-chain data stored in a storage node or recording off-chain data in the storage node according to the service request, and ii) sending a transaction proposal to the blockchain node for a record associated with the service request to be stored in the blockchain.

Blockchain based data management system and method thereof

An apparatus for guaranteeing the integrity of a state database includes a memory for storing one or more instructions, a communication interface for communicating with one or more blockchain nodes and a processor. The processor is configured, by executing the stored one or more instructions, to receive a request to query for a state value, obtain a first state value by querying a state database in response to the request, forward the request to the one or more blockchain nodes to receive a second state value from the one or more blockchain nodes and compare the first state value with the second state value to determine integrity of a state value.

Apparatus for guaranteeing integrity of state database in blockchain-based environment and method thereof

An optical module for surface inspection includes a first light source unit that illuminates a substrate with first light produced by a first light source and a first beam splitter that changes the path of the first light, a second light source unit that illuminates the substrate with second light polarized in a first direction, a direction of polarization changing unit that illuminates the substrate with the third light polarized in a second direction perpendicular to the first direction, and a detection unit that detects fourth light which is a product of the first light reflecting from the substrate, fifth light which is a product of the second light scattered from the substrate, and sixth light which is a product of the third light scattered from the substrate. The third light is produced by changing the direction of polarization of the second light reflected from the inspected substrate.

Optical module for surface inspection and surface inspection apparatus including the same

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Seoul, South Korea

Young Yoo Heo