Abstract: At least one labyrinth seal assembly is disposed within a roller cutter of a roller reamer. A first labyrinth seal assembly of a roller cutter is positioned toward a first pillow block of a cutter cartridge that includes the roller cutter. A bearing shaft of the cutter cartridge extends through an inner channel of the roller cutter. The cutter cartridge is retained in an axial recess of a tool body of the roller reamer via a compound and separate wedging of each of the two pillow blocks into a same axial recess by means of a shaped wedge particularly specialized to improve secure coupling of the assembly and reduce rattling of components. Each pillow block is rotatably coupled to the bearing shaft at an opposing end of the roller cutter.

Abstract: The present invention provides non-planar cutting tooth and a diamond drill bit. The non-planar cutting tooth and the diamond drill bit have great ability of impact resistance and balling resistance. According to the features of drilled formation, cutting teeth are arranged on the drill bit with different mode, which can improve the mechanical speed and footage of the drill bit.

Abstract: The invention relates to reamers used in downhole oil well drilling operations, particularly in reaming while drilling applications. Presented is a reamer having an interior channel which runs along an elongate axis of the entire body of the reamer, wherein there are openings along both ends of the reamer, exposing the interior channel. Additionally presented in the reamer are a plurality of paths extending parallel to the interior channel along the exterior of the body of the reamer, and running in a helical pattern along the entirety of the exterior of the body of the reamer. Disposed within the helical paths are a plurality of cutting inserts, which cutting inserts are enabled to provides a uniform cutting surface against a well bore, which preferably improves cutting action and reduces strain on the reamer.

Abstract: A method for handling one or more transactions using at least one blockchain network is provided. The method includes steps of: (a) a transaction server, if one or more requests for registering one or more transactions are acquired, confirming storage space of an n-th distributed ledger to register one or more current blocks, corresponding to the transactions, in the n-th distributed ledger which is in an active state; and (b) the transaction server, if the storage space is determined as satisfying at least one preset condition, generating at least one representative block by referring to the transactions in the current blocks registered in the n-th distributed ledger, creating an (n+1)-th distributed ledger whose genesis block is the representative block, and registering one or more next blocks, which are requested for registration after the representative block is registered, in the (n+1)-th distributed ledger.

Abstract: A method of handling transactions using blockchain networks is provided. The method includes steps of: a transaction-managing server (a) if requests for registering transactions are acquired, confirming each validity of each of said transactions and queueing each of said transactions in case it is determined as valid; (b) classifying the queued transactions such that each of the queued transactions corresponds to each of the blockchain networks per each of channels; and (c) by transmitting each of the classified queued transactions to each of the blockchain networks, instructing each of the blockchain networks to convert the classified queued transactions per each of the channels into one representative transaction per each of the channels, and if a distributive consensus on the converted representative transaction is reached, allowing one block including the classified queued transactions corresponding to said one representative transaction to be registered in one of distributed ledgers.

Abstract: A method for token management of exchanging between a first cryptocurrency used by a first blockchain network and a second cryptocurrency used by a second blockchain network dependent on the first cryptocurrency is provided. The method includes steps of: a token-managing server (a) if a user's request for converting the first into the second cryptocurrencies is acquired, instructing the first blockchain network to transfer ownership of the first cryptocurrency to the token-managing server and issue the second cryptocurrency and instructing the second blockchain network to transfer ownership of the second cryptocurrency to the user; and (b) if a request of the user for converting the second into the first cryptocurrencies is acquired, instructing the second blockchain network to transfer ownership of the second cryptocurrency to the token-managing server and revocate the second cryptocurrency and instructing the first blockchain network to transfer ownership of the first cryptocurrency to the user.

Abstract: The present invention relates to a method for secure key input that enables key input of a unit value of authentication information without any change in a user terminal and has a usability, and further, enforces a security for authentication information of a user by preventing leakage of authentication information by server hacking fundamentally as well as preventing leakage of authentication information in the whole processes including a key value obtaining process of the user terminal, a key value transport process and an authentication process at a server. According to the present invention, alternative authentication information that replaces authentication information is used, a mapping value to be matched to a key of keyboard is randomly generated and used, and authentication procedure is performed using the authentication information which is randomly generated according to the alternative authentication information.

Abstract: Network device testing equipment capable of testing network devices using small size packets and for a transferring ability and a filtering ability at a media speed is described. A configuration is adopted in which a Field Programmable Gate Array (FPGA) included in a transmitter or receiver on one or both of transmitting and receiving sides is connected directly to a physical layer chip of a network and computers on both the transmitting and receiving sides are connected thereto. Each of the FPGAs of the transmitter and receiver has a circuit which has an integrated function of transmitting a packet pattern generation function and a packet-receiving function, thereby enabling a test and an inspection in real time. When inspecting the filtering function, a hash table storing therein a hash value and a list of occurrence frequencies for hash values is utilized.

Abstract: The present invention is intended for all documents and specifically provides matters-of-interest to users and characteristic information of those matters-of-interest in correspondence to identifiers within the documents and allows related services to be utilized through these documents.

Abstract: The purpose of the present invention is, for large quantities of document data, to display on a document, in a uniform manner, characteristic information that the user wants to reference, without needing to perform work individually for each element or keyword, and to design an efficient utilization of the document data.

Abstract: A retainer for retaining a shank in a recess. The retainer is in the form of a resilient collar having an inner surface co-acting with the shank and a peripheral surface co-acting with the walls of the recess. The peripheral surface is eccentrically displaced with respect to the inner surface. The inner surface of the retainer and the co-acting surface of the shank have complementary regular polygonal shapes.