Byung-Hee
Byung Hee Cho, Seoul KR
Patent application number | Description | Published |
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20100172685 | IMAGE FORMING APPARATUS - Disclosed is an image forming apparatus and printing media cassette thereof. The loading position of a loading plate of the printing media cassette can be varied based on the printing medium size by a capacity adjustment unit. The capacity adjustment unit may operate in association with the size adjustment guide so as to define the loading position based on the size of the printing media. The image forming apparatus can include the printing media cassette detachably received in the body thereof. | 07-08-2010 |
Byung Hee Hong, Seoul KR
Patent application number | Description | Published |
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20090297847 | GROWTH AND APPLICATIONS OF ULTRALONG CARBON NANOTUBES - Ultralong carbon nanotubes can be formed by placing a secondary chamber within a reactor chamber to restrict a flow to provide a laminar flow. Inner shells can be successively extracted from multi-walled carbon nanotubes (MWNTs) such as by applying a lateral force to an elongated tubular sidewall at a location between its two ends. The extracted shells can have varying electrical and mechanical properties that can be used to create useful materials, electrical devices, and mechanical devices. | 12-03-2009 |
20100101710 | METHOD FOR REMOVING A CARBONIZATION CATALYST FROM A GRAPHENE SHEET AND METHOD FOR TRANSFERRING THE GRAPHENE SHEET - A method for removing a carbonization catalyst from a graphene sheet, the method includes contacting the carbonization catalyst with a salt solution, which is capable of oxidizing the carbonization catalyst. | 04-29-2010 |
20100178464 | METHOD FOR CHEMICAL MODIFICATION OF A GRAPHENE EDGE, GRAPHENE WITH A CHEMICALLY MODIFIED EDGE AND DEVICES INCLUDING THE GRAPHENE - A method for chemical modification of graphene includes dry etching graphene to provide an etched graphene; and introducing a functional group at an edge of the etched graphene. Also disclosed is graphene, including an etched edge portion, the etched portion including a functional group. | 07-15-2010 |
20110195207 | GRAPHENE ROLL-TO-ROLL COATING APPARATUS AND GRAPHENE ROLL-TO-ROLL COATING METHOD USING THE SAME - There are provided a graphene roll-to-roll coating apparatus and a graphene roll-to-roll coating method on the basis of a continuous process. | 08-11-2011 |
20110209816 | METHOD FOR REMOVING A CARBONIZATION CATALYST FROM A GRAPHENE SHEET AND METHOD FOR TRANSFERRING THE GRAPHENE SHEET - A method for removing a carbonization catalyst from a graphene sheet, the method includes contacting the carbonization catalyst with a salt solution, which is capable of oxidizing the carbonization catalyst. | 09-01-2011 |
20110285999 | SURFACE PLASMON RESONANCE SENSOR USING METALLIC GRAPHENE, REPARING METHOD OF THE SAME, AND SURFACE PLASMON RESONANCE SENSOR SYSTEM - There is provided a surface plasmon resonance sensor including a metallic graphene layer formed in a core of a predetermined area of an optical fiber from which a jacket and a cladding are removed. Further, a preparing method of the surface plasmon resonance sensor and a surface plasmon resonance sensor system is also provided. | 11-24-2011 |
20120064246 | GROWTH AND APPLICATIONS OF ULTRALONG CARBON NANOTUBES - Ultralong carbon nanotubes can be formed by placing a secondary chamber within a reactor chamber to restrict a flow to provide a laminar flow. Inner shells can be successively extracted from multi-walled carbon nanotubes (MWNTs) such as by applying a lateral force to an elongated tubular sidewall at a location between its two ends. The extracted shells can have varying electrical and mechanical properties that can be used to create useful materials, electrical devices, and mechanical devices. | 03-15-2012 |
20120132358 | METHOD FOR REMOVING A CARBONIZATION CATALYST FROM A GRAPHENE SHEET AND METHOD FOR TRANSFERRING THE GRAPHENE SHEET - A method for removing a carbonization catalyst from a graphene sheet, the method includes contacting the carbonization catalyst with a salt solution, which is capable of oxidizing the carbonization catalyst. | 05-31-2012 |
20120258311 | ROLL-TO-ROLL TRANSFER METHOD OF GRAPHENE, GRAPHENE ROLL PRODUCED BY THE METHOD, AND ROLL-TO-ROLL TRANSFER EQUIPMENT FOR GRAPHENE - The present disclosure relates to a graphene roll-to-roll transfer method, a graphene roll-to-roll transfer apparatus, a graphene roll manufactured by the graphene roll-to-roll transfer method, and uses thereof. | 10-11-2012 |
20120270054 | ROLL-TO-ROLL DOPING METHOD OF GRAPHENE FILM, AND DOPED GRAPHENE FILM - The present disclosure relates to roll-to-roll doping method of graphene film, and doped graphene film. | 10-25-2012 |
20120282419 | GRAPHENE PROTECTIVE FILM SERVING AS A GAS AND MOISTURE BARRIER, METHOD FOR FORMING SAME, AND USE THEREOF - The present invention relates to a method for forming a graphene protective film having gas and moisture barrier properties, to a graphene protective film formed by the method, and to the use thereof. A single-layer or multi-layer graphene protective film can be used as a material for a barrier coating or bags, and improves the gas and moisture barrier properties of a variety of devices in a wide array of industrial fields to thereby maintain the electrical characteristics of devices over a long period of time. | 11-08-2012 |
20120288227 | OPTIC FIBER WITH CARBON NANO-STRUCTURE LAYER, FIBER OPTIC CHEMICAL SENSOR AND METHOD FOR FORMING CARBON NANO-STRUCTURE LAYER IN FIBER CORE - The invention relates to an optic fiber having a core in which carbon nano-structures are formed at a predetermined locus, a fiber optic chemical sensor using the optic fiber, and a method of forming the carbon nano-structure layer in the core of the optic fiber. The invention utilizes gas refractive index and the adsorption sensitivity of particles on the surface of the carbon nano-structure layer, and uses the carbon nano-structure layer in the core of the optic fiber as a sensor for particles of gas, liquid and the like. | 11-15-2012 |
20120298396 | GRAPHENE FIBER, METHOD FOR MANUFACTURING SAME AND USE THEREOF - The present disclosure relates to a manufacturing method of a graphene fiber, a graphene fiber manufactured by the same method, and use thereof. The graphene fiber formed by using graphenes of linear pattern can be applied to various fields such as an electric wire and coaxial cable. | 11-29-2012 |
20130022811 | STABLE GRAPHENE FILM AND PREPARING METHOD OF THE SAME - The present disclosure relates to a stable graphene film, a preparing method of the stable graphene film, a graphene transparent electrode including the stable graphene film, and a touch screen including the stable graphene film. | 01-24-2013 |
20130068521 | ELECTROMAGNETIC SHIELDING METHOD USING GRAPHENE AND ELECTROMAGNETIC SHIEDLING MATERIAL - The present application relates to a method for shielding electromagnetic waves by using graphene inside or outside an electromagnetic wave generating source and/or by using graphene formed on a substrate, and an electromagnetic shielding material including the graphene. | 03-21-2013 |
20130130011 | METHOD FOR PREPARING GRAPHENE, GRAPHENE SHEET, AND DEVICE USING SAME - THE PRESENT INVENTION PROVIDES A METHOD FOR PREPARING GRAPHENE BY PROVIDING A REACTION GAS INCLUDING A CARBON SOURCE AND HEAT ONTO A SUBSTRATE, AND REACTING THE SAME TO FORM A GRAPHENE ON THE SUBSTRATE, A GRAPHENE SHEET FORMED BY THE METHOD, AND A DEVICE USING THE SAME. | 05-23-2013 |
20130157034 | METHOD FOR CHEMICAL MODIFICATION OF A GRAPHENE EDGE, GRAPHENE WITH A CHEMICALLY MODIFIED EDGE AND DEVICES INCLUDING THE GRAPHENE - A method for chemical modification of graphene includes dry etching graphene to provide an etched graphene; and introducing a functional group at an edge of the etched graphene. Also disclosed is graphene, including an etched edge portion, the etched portion including a functional group. | 06-20-2013 |
20130187097 | METHOD FOR PRODUCING GRAPHENE AT A LOW TEMPERATURE, METHOD FOR DIRECT TRANSFER OF GRAPHENE USING SAME, AND GRAPHENE SHEET - The present invention relates to a method for forming graphene at a low temperature, to a method for direct transfer of graphene using same, and to a graphene sheet. The method for forming graphene at a low temperature comprises supplying a carbon-source-containing gas to a metal catalyst layer for graphene growth formed on a substrate, and forming graphene at a low temperature of 500° C. or less by means of inductively coupled plasma-chemical vapor deposition (ICP-CVD). | 07-25-2013 |
20130285970 | TOUCH SENSOR USING GRAPHENE FOR SIMULTANEOUSLY DETECTING A PRESSURE AND A POSITION - A touch sensor capable of specifying a touch position and/or a degree of a touch pressure by using graphene as an electrode and/or a strain gauge, and more particular, a touch sensor capable of simultaneously detecting a pressure and a position by means of change in resistance by using graphene is provided. | 10-31-2013 |
20130299077 | METHOD FOR TRANSFERRING GRAPHENE USING A HOT PRESS - The present invention relates to a method for transferring graphene using a hot press, comprising: a step of contacting graphene, having a thermal-releasable sheet attached thereto, with a target substrate; and a step of pressing and heating the graphene having the thermal-releasable sheet attached thereto and the target substrate using the upper press and lower press of a hot press so as to separate the thermal-releasable sheet and the graphene and transfer the separated graphene to the target substrate. The present invention also relates to a graphene-transfer hot press apparatus for said transfer process. | 11-14-2013 |
20140021195 | FLEXIBLE TRANSPARENT HEATING ELEMENT USING GRAPHENE AND METHOD FOR MANUFACTURING THE SAME - The present invention relates to a flexible transparent heating element using graphene and a method for manufacturing the same. The heating element comprises a flexible transparent substrate; a graphene layer formed to at least one side of the flexible transparent substrate; and an electrode connected with the graphene layer. | 01-23-2014 |
20140054550 | METHOD FOR N-DOPING GRAPHENE - The present disclosure provides an n-doping method of graphene, including supplying a reaction gas containing a carbon source and heat to a substrate and reacting to grow graphene on the substrate; and n-doping the graphene by a doping solution containing an n-type dopant or a vapor containing an n-type dopant, an n-doped graphene produced by the method, and a device including the n-doped graphene. | 02-27-2014 |
20140218867 | PASSIVE LAYER FOR ATTENUATION OF NEAR-FIELD ELECTROMAGNETIC WAVES AND HEATDISSIPATION INCLUDING GRAPHENE, AND ELECTROMAGNETIC DEVICE INCLUDING THE SAME - The present invention relates to a passive layer including graphene for the attenuation of near-field electromagnetic waves and heat dissipation. The passive layer blocks electromagnetic waves radiated from an external electronic device or prevents electromagnetic waves generated in an electronic device from emitting to the outside. The passive layer is designed to reduce interference between transmission circuits of a device in the near-field region or influence such as malfunction caused by external electromagnetic waves. The present invention also relates to an electromagnetic device and a circuit board, each including the passive layer. | 08-07-2014 |
20150068684 | ROLL-TO-ROLL TRANSFER METHOD OF GRAPHENE, GRAPHENE ROLL PRODUCED BY THE METHOD, AND ROLL-TO-ROLL TRANSFER EQUIPMENT FOR GRAPHENE - The present disclosure relates to a graphene roll-to-roll transfer method, a graphene roll-to-roll transfer apparatus, a graphene roll manufactured by the graphene roll-to-roll transfer method, and uses thereof. | 03-12-2015 |
20150104623 | PATTERNING METHOD FOR GRAPHENE USING HOT-EMBOSSING IMPRINTING - The present application provides a patterning method of a graphene, including a step of forming a graphene layer on a polymer substrate and a step of forming a nanopattern on the graphene layer by hot embossing imprinting. | 04-16-2015 |
Byung Hee Kang, Daejeon KR
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20150064587 | APPARATUS AND METHOD FOR CONTROLLING FUEL CELL SYSTEM USING SUB-POWER CONDITIONING SYSTEM - Disclosed herein is an apparatus and method for controlling a fuel cell system. The apparatus includes a main power conditioning system which supplies output of normal stacks among a plurality of fuel cell stacks to a load, a sub-power conditioning system which supplies output of one or more deteriorated stacks among the fuel cell stacks to a load, a switching unit which changes a target to which output of each of the fuel cell stacks is connected, and a control unit which senses conditions of each of the fuel cell stacks and controls the switching unit. The apparatus prevents deterioration in performance of some stacks from affecting the other normal stacks. Furthermore, the deteriorated fuel cell stacks are separately controlled to provide power to a sub-load through a sub-power conditioning system. | 03-05-2015 |
20150064588 | APPARATUS AND METHOD FOR CONTROLLING FUEL CELL SYSTEM - Disclosed herein is an apparatus for controlling a fuel cell system, including: a plurality of stack state detecting units for detecting respective states of a plurality of fuel cell stacks; a switching unit for connecting at least parts of the plurality of fuel cell stacks to each other in series or in parallel; and a control unit for detecting at least one degraded stack based on the states of the stacks detected by the plurality of stack state detecting units, and forming at least one degraded stack unit including the detected at least one degraded stack by controlling the operation of the switching unit, so the apparatus can quickly and easily connect the stacks to each other in series, in parallel or in series-parallel using cheap electric switches instead of using a plurality of power conditioning system (PCS). | 03-05-2015 |
Byung Hee Kim, Yongin-Si KR
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20130087770 | Organic Light Emitting Display Device - An organic light emitting display device which includes a base member; an organic light emitting display unit disposed on the base member and configured to generate an image; a sealing layer configured to seal the organic light emitting display unit; a capping substrate disposed on the sealing layer and having a plurality of metal layers, one of the metal layers being in contact with the sealing layer and having at least one groove; and a moisture absorbent provided in the groove. | 04-11-2013 |
Byung Hee Seo, Gyeonggi-Do KR
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20090018334 | Chiral inorganic-organic composite porous material and method for preparing the same - The present invention provides a chiral inorganic-organic composite porous material in which cationic chiral organic molecules are present as charge-balancing cations in a porous material containing charge-balancing cations, as well as a method for preparing the same by an ion exchange process. The chiral inorganic-organic composite porous material according to the present invention is excellent in stability, selectivity and durability, and thus, will be useful as a chiral-selective catalyst or a material of separating an isomeric mixture. | 01-15-2009 |
Byung Hee Yoo, Kyungki-Do KR
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20090232855 | Percutaneous controlled releasing material using nano-sized polymer particles and external application agent containing the same - A percutaneous releasing material and agent having characteristics that include a high stability of an active agent in the formulation, a high topical absorption rate, decreased irritation on the skin, and an increased tactile comfort. The percutaneous releasing material incorporates an external application agent composition that is prepared by using nanometer-sized polymer particles, i.e., particles having a size or diameter between approximately 1 nm and approximately 500 nm, and more preferably having a size between about 30 nm and about 150 nm. Further, the percutaneous releasing material and agent according to the present invention incorporate polymer particles that preferably contain a physiologically active agent that more readily penetrates through the stratum corneum to the upper layer of the dermis, whereby the physiologically active agent is effused into the skin while staying in the upper layer of dermis. | 09-17-2009 |
Byung-Hee Cho, Suwon-Si KR
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20080257100 | LEVER ASSEMBLY, IMAGE FORMING APPARATUS HAVING THE SAME, AND SOLENOID USED IN THE SAME - A lever assembly controls a pickup roller, and includes a lever, a solenoid to actuate the lever, and a supporting plate on which the lever is rotatably disposed and to which the solenoid is connected at one side of the lever. | 10-23-2008 |
Byung-Hee Choi, Daejeon KR
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20090070043 | METHOD AND APPARATUS FOR MEASURING IN-SITU STRESS OF ROCK USING THERMAL CRACK - Disclosed is a method and apparatus for measuring in-situ stress in rock using a thermal crack. The method involves forming a borehole, cooling a wall of the borehole, applying tensile thermal stress, forming a crack in the borehole wall, and measuring temperature and cracking point. Afterwards, the borehole wall is heated to close the formed crack, the borehole wall is cooled again to re-open the crack, and temperature is measured when the crack is re-opened. The in-situ stress of the rock is calculated using a first cracking temperature at which the crack is formed and a second cracking temperature at which the crack is re-opened. Further, the apparatus cools, heats and re-cools the borehole wall, thereby measuring the first cracking temperature, the second cracking temperature, and the cracking point. | 03-12-2009 |
20090304570 | MANUFACTURING METHODS OF MESOPOROUS CARBON STRUCTURE WITH SPRAY DRYING OR SPRAY PYROLYSIS AND COMPOSITION THEREOF - Disclosed is a method for preparing a porous carbon structure, the method comprising the steps of: (a) mixing a carbon precursor, a pyrolytic template, which is pyrolyzed at the carbonization temperature of the carbon precursor or removed by post-treatment after the carbonization of the carbon precursor so as to form pores, and a solvent, to prepare a spray solution; and (b) subjecting the spray solution either to spray pyrolysis or to spray drying and then spray pyrolysis, so as to form a carbonized carbon structure, and then removing the template from the carbon structure. A mesoporous spherical carbon prepared according to the disclosed method may have a large specific surface area and a large pore volume through the control of the kind and concentration of template, and thus can be used in a wide range of applications, including catalysts, adsorbents, electrode materials, materials for separation and purification, and materials for storing hydrogen and drugs. | 12-10-2009 |
Byung-Hee Hong, Suwon-City KR
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20110070146 | METHOD OF MANUFACTURING GRAPHENE, GRAPHENE MANUFACTURED BY THE METHOD, CONDUCTIVE FILM COMPRISING THE GRAPHENE, TRANSPARENT ELECTRODE COMPRISING THE GRAPHENE, AND RADIATING OR HEATING DEVICE COMPRISING THE GRAPHENE - Provided are a method of manufacturing graphene, graphene manufactured by the method, a conductive thin film including the graphene, a transparent electrode comprising the graphene, and a radiating or heating device comprising the graphene. The method includes: preparing a graphene member including a base member, a hydrophilic oxide layer formed on the base member, a hydrophobic metal catalyst layer formed on the oxide layer, and graphene grown on the metal catalyst layer; applying water to the graphene member; separating the metal catalyst layer from the oxide layer; and removing the metal catalyst layer using an etching process. | 03-24-2011 |
20110171427 | METHOD OF MANUFACTURING DEFORMATION-CAPABLE GRAPHENE SHEET, DEFORMATION-CAPABLE GRAPHENE SHEET, AND DEVICE USING THE SAME - A graphene sheet and a method of manufacturing the graphene sheet are provided. The method includes: growing a graphene sheet on a graphene growth support by applying carbon sources and heat to the graphene growth support, the graphene growth support including a carbonization catalyst; and forming at least one ripple on the graphene sheet by cooling at least one of the graphene growth support and the graphene sheet, wherein the graphene growth support and the graphene sheet have different thermal expansion coefficients. | 07-14-2011 |
20120128983 | MULTI-LAYERED GRAPHENE SHEET AND METHOD OF FABRICATING THE SAME - A method of fabricating multi-layered graphene includes disposing a first graphene layer on a carrier; disposing at least one second graphene layer on the first graphene layer to form a graphene sheet disposed on the carrier; and transferring the graphene sheet disposed on the carrier onto a substrate, wherein each of the graphene layers which constitute the graphene sheet has at least one damaged region, and the at least one damaged region of each of the graphene layers contacts at least one of non-damaged regions of a graphene layer or graphene layers, of the graphene layers, contacting the each of the graphene layers. | 05-24-2012 |
Byung-Hee Hong, Gyeonggi-Do KR
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20100065899 | SEMICONDUCTOR DEVICES INCLUDING AUXILIARY GATE ELECTRODES AND METHODS OF FABRICATING THE SAME - A semiconductor device may include first and second auxiliary gate electrodes and a semiconductor layer crossing the first and second auxiliary gate electrodes. A primary gate electrode may be provided on the semiconductor layer so that the semiconductor layer is between the primary gate electrode and the first and second auxiliary gate electrodes. Moreover, the first and second auxiliary gate electrodes may be configured to induce respective first and second field effect type source/drain regions in the semiconductor layer. Related methods are also discussed. | 03-18-2010 |
20140290565 | METHOD OF MANUFACTURING GRAPHENE USING METAL CATALYST - The present invention relates to a method for producing graphene on a face-centered cubic metal catalyst having a plane oriented in one direction, and more particularly to a method of producing graphene on a metal catalyst having the (100) or (111) crystal structure and a method of producing graphene using a catalyst metal foil having a single orientation, obtained by electroplating a metal catalyst by a pulse wave current and annealing the metal catalyst. The invention also relates to a method of producing graphene using a metal catalyst, and more particularly to a method of producing graphene, comprising the steps of: alloying a metal catalyst with an alloying element; forming step structures on the metal catalyst substrate in an atmosphere of a gas having a molecular weight of carbon; and supplying hydrocarbon and hydrogen gases to the substrate. On unidirectionally oriented metal catalyst prepared according to the present invention, graphene can be grown uniformly and epitaxially. Moreover, a method for producing graphene according to the present invention can form monolayer graphene by epitaxially growing graphene while increasing the growth rate of graphene. | 10-02-2014 |
Byung-Hee Hong, Changwon-City KR
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20140017160 | METHOD AND APPARATUS FOR MANUFACTURING GRAPHENE - A method and an apparatus for synthesizing graphene. The method includes loading catalyst metals into a chamber in the horizontal direction or the vertical direction; increasing sizes of grains of the catalyst metals by heating the catalyst metals; raising a temperature inside the chamber while providing a vapor carbon source in the catalyst metals; and forming graphene by cooling the catalyst metals. | 01-16-2014 |
Byung-Hee Kim, Suwon-Si KR
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20090237324 | Dual display module and display apparatus having the same - A dual display module having a first display panel and a second display panel, the dual display module including a bezel arranged between the first display panel and the second display panel, and having a penetration area between the first display panel and the second display panel; and a supporting member arranged between the bezel and the second display panel and supporting the second display panel, the supporting member having at least one protrusion unit that protrudes through the penetration area to face the first display panel. | 09-24-2009 |
Byung-Hee Kim, Yongin-City KR
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20090116211 | DOUBLE-SIDED LIGHT EMITTING DEVICE - A double-sided light emitting device including lower and upper substrates, an emission element formed between an inner surface of the upper substrate and an inner surface of the lower substrate and emitting predetermined light, an upper layer of polarizing material disposed on at least one of inner and outer surfaces of the upper substrate, and a lower layer of polarizing material disposed on at least one of inner and outer surfaces of the lower substrate. | 05-07-2009 |
20090129047 | DOUBLE-SIDED LIGHT EMITTING DEVICE - A double-sided light emitting device including lower and upper substrates, an emission element formed between an inner surface of the upper substrate and an inner surface of the lower substrate and emitting predetermined light, an upper layer of polarizing material disposed on at least one of inner and outer surfaces of the upper substrate, and a lower layer of polarizing material disposed on at least one of inner and outer surfaces of the lower substrate. | 05-21-2009 |
20130026503 | LIGHT EMITTING DIODE DISPLAY AND MANUFACTURING METHOD THEREOF - An organic light emitting diode (OLED) display includes a substrate, an OLED on the substrate, and an encapsulation layer on the substrate with the OLED therebetween. The encapsulation layer includes a plurality of metal layers. Two of the plurality of metal layers are directly attached to each other. | 01-31-2013 |
Byung-Hee Lee, Seoul KR
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20150121255 | ELECTRONIC DEVICE, AND METHOD AND COMPUTER-READABLE RECORDING MEDIUM FOR DISPLAYING MESSAGE IN ELECTRONIC DEVICE - A method of displaying a message on a chat window is provided. The method includes selecting a cartoon image group including a plurality of cartoon cut images, receiving a chat content, selecting a cartoon cut image from the selected cartoon cut image group, and displaying the selected cartoon cut image including the received chat content in some areas of the selected cartoon cut image on a messenger chat window. | 04-30-2015 |
Byung-Hee Lee, Gyeonggi-Do KR
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20100183150 | Shared key management method, shared key generating method and message communication method for scada system, and recording medium - A shared key management method for a Supervisory Control And Data Acquisition (SCADA) system in which a master terminal unit (MTU), a plurality of sub master terminal units (SUB-MTUs), and a plurality of remote terminal units (RTUs) are configured in a sequential hierarchy, is provided. The method includes: (a) at the MTU, generating a plurality of secret keys and respectively allocating the secret keys to the RTUs; (b) at the MTU, generating a group key in a tree structure, wherein a leaf node of the tree structure corresponds to each RTU, a parent node of a node corresponding to an RTU corresponds to a SUB-RTU to which the RTU is connected, a shared key of each node of the group key is generated by hashing shared keys of all child nodes, and a shared key of a leaf node of the group key is set as a secret key of the RTU; (c) at the RTU or the SUM-MTU, receiving and storing shared keys of every node from a node corresponding to itself to a root node; (d) when the RTU or the SUM-MTU is added or deleted, at the MTU, generating shared keys of nodes along a path from a node corresponding to the added or deleted terminal unit to the root node again; and (e) at the RTU or the SUB-MTU, receiving and storing the generated shared keys. According to the key management method for the SCADA system described above, in the case of encrypting and broadcasting or multicasting a message, a computation amount can be reduced. | 07-22-2010 |