Patents by Inventor Chang-Ho Choi
Chang-Ho Choi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7664702Abstract: The present invention relates to a method of conducting an EMV (Europay Master Visa) payment process optimally using IrFM (Infrared Financial Messaging) between a mobile terminal and a POS (Point Of Sale) terminal. In the present method, if a buyer is authenticated based on information written in a card chip installed in a mobile terminal, information for transaction approval is transmitted to a POS terminal, and if an approval is responded from the POS terminal, a digital receipt for this transaction is transmitted to the POS terminal. Then, if transaction end is requested from the POS terminal, a connected session is released.Type: GrantFiled: October 28, 2002Date of Patent: February 16, 2010Assignee: SK Telecom Co., Ltd.Inventors: Eun Su Jung, Kwon Je Seong, Jong Sung Park, Chang Ho Choi
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Publication number: 20100006081Abstract: The present invention relates to a method for manufacturing silicon articles for a plasma processing apparatus. The present invention provides a method for manufacturing silicon articles, comprising: preparing a silicon ingot; forming a hollow silicon cylinder and a silicon core cylinder having a diameter less than that of the silicon ingot by coring the silicon ingot; forming a silicon annular plate having a central opening by cutting the hollow silicon cylinder and forming a silicon electrode plate by cutting the silicon core cylinder; and forming a silicon ring by processing the silicon annular plate and forming a silicon electrode by processing the silicon electrode plate. According to the present invention, a hollow silicon cylinder and a silicon core cylinder are manufactured by coring a cylindrical silicon ingot before the silicon ingot is sliced.Type: ApplicationFiled: August 2, 2007Publication date: January 14, 2010Applicant: HANA SILICON, INCInventor: Chang Ho Choi
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Publication number: 20090166142Abstract: Provided are a tunnel type power generating apparatus and a method of generating power using the same capable of converting residual kinetic energy caused by movement of vehicles into electric energy and storing the converted electric energy to be used. The tunnel type power generating apparatus includes: a magnetic body selectively attached to an upper part or a lower part of a vehicle; a tunnel type coil formed of a conductive coil wound several times in one direction to generate induced current when the magnetic body passes therethrough; and a case into which the tunnel type coil is inserted, absorbing impact applied by a vehicle load to prevent damage to the tunnel type coil, and having a size corresponding to a road width.Type: ApplicationFiled: February 4, 2008Publication date: July 2, 2009Inventors: Min Suk Hyun, Hyung Joo Kim, Chang Ho Choi, Kil Koang Kwon
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Publication number: 20090154436Abstract: The present invention relates to a method and apparatus for transmitting data over a WLAN mesh network. Transmission sections of priority frames and general frames are initially set, and the priority frame transmission section is varied step-by-step within a specific range. Thus, QoS with respect to data requiring the real-time property can be guaranteed and transmission of general frames can be guaranteed to some degree. Accordingly, there is an effect that data transmission efficiency can be improved significantly.Type: ApplicationFiled: December 8, 2008Publication date: June 18, 2009Applicant: Electronics and Telecommunications Research InstituteInventors: Chang Ho Choi, Yong Wook Ra, Byung Jun Ahn, Kyeong Ho Lee
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Patent number: 7542785Abstract: In a method for setting up theme pictures and bells of a mobile telecommunication terminal, contents data stored in a storage unit of the mobile telecommunication terminal are retrieved based on a user's setting of a theme picture and a bell. A selection window is provided to the user to select the retrieved contents data. It is to determine whether the contents data selected in the selection window are VOD contents. If the contents data are the VOD contents data, at least one among video and audio data including the VOD contents data is decoded. A setup window is provided to determine whether the theme pictures include the decoded audio data. A speaker of the mobile telecommunication terminal is controlled on or off based on a user's setting of the setup window when the theme pictures are set up.Type: GrantFiled: November 22, 2002Date of Patent: June 2, 2009Assignee: SK Telecom Co., Ltd.Inventors: Keun Hee Shin, In Seong Hwang, Hee Won Park, Sang Ho Chae, Chang Ho Choi, Won Hee Sull
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Publication number: 20090080452Abstract: A packet processing apparatus and method are provided. The packet processing apparatus changes a size of an input packet, analyzes the input packet to perform a second layer associated process, generates basic delivery headers of the input packet, processes the input packet to which the basic delivery headers are inserted according to a type of the input packet, transforms the header of the input packet to which the basic delivery headers are inserted, and transitions the header-transformed input packet to delivers the packet. Accordingly, it is possible to process various packets without addition of separate process to the packet processing apparatus. In addition, a use efficiency of a network processing unit can be optimized, so that it is possible to increase a packet processing rate and performance.Type: ApplicationFiled: April 30, 2008Publication date: March 26, 2009Inventors: Yong Wook Ra, Chang Ho Choi, Byung Jun Ahn, Kyeong Ho Lee
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Patent number: 7496115Abstract: Provided are an apparatus for multiplexing Gigabit Ethernet frames and an apparatus for demultiplexing 10-Gigabit Ethernet frames. The apparatus for multiplexing Gigabit Ethernet frames includes at least one pre-processing unit, a multiplexing unit, an SDR/DDR conversion unit, and a control unit. The at least one pre-processing unit receives Gigabit Ethernet frames, converts the Gigabit Ethernet frames into 10-Gigabit Ethernet frames, and outputs the 10-Gigabit Ethernet frames. The multiplexing unit receives the 10-Gigabit Ethernet frames, time division multiplexes the 10-Gigabit Ethernet frames in frame units, and outputs the time division multiplexed 10-Gigabit Ethernet frames as first data. The SDR/DDR conversion unit, which converts the first data into second data having two 32-bit bus structures and outputs the second data. The control unit outputs a first control signal in response to an output request of the pre-processing unit.Type: GrantFiled: April 29, 2004Date of Patent: February 24, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Chang Ho Choi, Bheom Soon Joo, Do Yeon Kim, Hae Won Jung
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Publication number: 20080230400Abstract: An apparatus for a continuous, automated quantitation of tin compounds in liquid samples and a method for quantitative analysis based on the said apparatus are provided herein. The inventive apparatus acidifies liquid samples and in case organotin compounds are present in the sample, a selective UV irradiation converts the organotin compounds into inorganic tin. The inventive apparatus quantitates this inorganic tin by means of electrochemical methods. The apparatus and method of the present invention allow quantitative analyses of trace amounts of organic and inorganic tin compounds present in liquid samples by converting organotin, a form unsuited for measurement, into inorganic tin, a form amenable to measurements and performing electrochemical analysis. Above all, the present invention affords the construction of an automated, continuous analysis system, making unnecessary additional manual operations and reducing labor costs.Type: ApplicationFiled: October 12, 2007Publication date: September 25, 2008Inventors: Yong Su Choi, Seok Won Hong, Sang Hyup Lee, Hyung Joo Kim, Chang Ho Choi, Bong Geun Jeong
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Patent number: 7394825Abstract: Disclosed herein is a 10-gigabit Ethernet line interface apparatus and method of controlling the same. The apparatus has N network processors, a frame multiplexing and demultiplexing block, a 10-gigabit extender sublayer processing block, a 10-gigabit Ethernet physical layer processing block, a 10-gigabit physical layer control logic, a line interface control logic, and a line processor. The N network processors are connected to the switch fabric unit. The frame multiplexing and demultiplexing block provides GMII and XGMII between the N network processors and a 10-gigabit extender sublayer processing block. The present invention can improve transmission speed and packet processing performance of a physical layer to a 10 Gbps level while maintaining basic frame standards of a 1-gigabit Ethernet switch apparatus.Type: GrantFiled: May 20, 2003Date of Patent: July 1, 2008Assignee: Electronics and Telecommunications Research InstituteInventors: Do Yeon Kim, Sang Min Lee, Chang Ho Choi, Sung Soo Kang, Hae Won Jung, Hyeong Ho Lee
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Patent number: 7354240Abstract: There is provided a centrifugal turbo machine comprising: a volute casing; a rotation axis coupled with the volute casing through a bearing; an impeller which is coupled to an end of the rotation axis and sucks fluid with a centrifugal force due to its rotation; and an axial thrust control member which is coupled to the volute casing at the rear of the impeller in a direction in which the fluid flows and prevents rotation of the fluid by the impeller. It is easy to fabricate and install the centrifugal turbo machine and it is possible to reduce the difference in static pressure of fluid by using the economical axial thrust control member so as to prevent the generation of the axial thrust, which results in damage of the bearing, etc. Therefore, it is possible to stably operate the centrifugal turbo machine.Type: GrantFiled: December 16, 2005Date of Patent: April 8, 2008Assignee: Korea Aerospace Research InstituteInventors: Chang-Ho Choi, Jinhan Kim
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Publication number: 20070140834Abstract: There is provided a centrifugal turbo machine comprising: a volute casing; a rotation axis coupled with the volute casing through a bearing; an impeller which is coupled to an end of the rotation axis and sucks fluid with a centrifugal force due to its rotation; and an axial thrust control member which is coupled to the volute casing at the rear of the impeller in a direction in which the fluid flows and prevents rotation of the fluid by the impeller. It is easy to fabricate and install the centrifugal turbo machine and it is possible to reduce the difference in static pressure of fluid by using the economical axial thrust control member so as to prevent the generation of the axial thrust, which results in damage of the bearing, etc. Therefore, it is possible to stably operate the centrifugal turbo machine.Type: ApplicationFiled: December 16, 2005Publication date: June 21, 2007Inventors: Chang-Ho Choi, Jinhan Kim
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Patent number: 7202800Abstract: A remote meter reading system is provided. The system comprises a meter reading system for sending metering information of a subscriber via the infrastructure of a mobile communication system; and a remote control system in communication with the meter reading system for collecting the metering information of the subscriber. The metering information is transferred to the remote control system via a short message service (SMS) of the mobile communication system and the mobile communication network operates based on a code division multiple access (CDMA) technology.Type: GrantFiled: July 11, 2003Date of Patent: April 10, 2007Inventor: Chang Ho Choi
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Patent number: 7130937Abstract: In a method for providing a video data streaming service, a server determines whether an occupancy is below a first threshold or is equal to or greater than a second threshold, the occupancy representing the amount of data occupying a queuing buffer of a terminal and the first threshold being less than the second threshold. If the occupancy is not below the first threshold, the server provides the data streaming service at a predetermined service bit rate which is less than the current service bit rate. If the occupancy is equal to or greater than a second threshold, the server provides the data streaming service at a predetermined service bit rate which is greater than the current service bit rate.Type: GrantFiled: November 22, 2002Date of Patent: October 31, 2006Assignee: SK Telecom Co., Ltd.Inventors: In Seong Hwang, Sang Ho Chae, Hee Won Park, Keun Hee Shin, Chang Ho Choi, Won Hee Sull
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Publication number: 20040236672Abstract: The present invention relates to a method of conducting an EMV (Europay Master Visa) payment process optimally using IrFM (Infrared Financial Messaging) between a mobile terminal and a POS (Point Of Sale) terminal. In the present method, if a buyer is authenticated based on information written in a card chip installed in a mobile terminal, information for transaction approval is transmitted to a POS terminal, and if an approval is responded from the POS terminal, a digital receipt for this transaction is transmitted to the POS terminal. Then, if transaction end is requested from the POS terminal, a connected session is released.Type: ApplicationFiled: July 2, 2004Publication date: November 25, 2004Inventors: Eun Su Jung, Kwon Ja Seong, Jong Sung Park, Chang Ho Choi
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Publication number: 20040174270Abstract: A remote meter reading system is provided. The system comprises a meter reading system for sending metering information of a subscriber via the infrastructure of a mobile communication system; and a remote control system in communication with the meter reading system for collecting the metering information of the subscriber. The metering information is transferred to the remote control system via a short message service (SMS) of the mobile communication system and the mobile communication network operates based on a code division multiple access (CDMA) technology.Type: ApplicationFiled: July 11, 2003Publication date: September 9, 2004Applicant: LG Electronics Inc.Inventor: Chang Ho Choi
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Publication number: 20040109465Abstract: Disclosed herein is a 10-gigabit Ethernet line interface apparatus and method of controlling the same. The apparatus has N network processors, a frame multiplexing and demultiplexing block, a 10-gigabit extender sublayer processing block, a 10-gigabit Ethernet physical layer processing block, a 10-gigabit physical layer control logic, a line interface control logic, and a line processor. The N network processors are connected to the switch fabric unit. The frame multiplexing and demultiplexing block provides GMII and XGMII between the N network processors and a 10-gigabit extender sublayer processing block. The present invention can improve transmission speed and packet processing performance of a physical layer to a 10 Gbps level while maintaining basic frame standards of a 1-gigabit Ethernet switch apparatus.Type: ApplicationFiled: May 20, 2003Publication date: June 10, 2004Inventors: Do Yeon Kim, Sang Min Lee, Chang Ho Choi, Sung Soo Kang, Hae Won Jung, Hyeong Ho Lee
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Patent number: 6331598Abstract: A process for preparing an emulsion polymer comprising placing a first mixture of monomers in a feed tank B which is connected directly to a reactor, placing a second mixture of monomers in a feed tank A which is connected to the feed tank B, and continuously varying the composition ratio of the monomers of feed tanks A and B in the emulsion polymer. The composition ratio is varied by varying the rate of feeding of the second mixture of monomers present in tank A into tank B while simultaneously varying the rate of feeding of the first mixture of monomers present in tank B into the reactor. The polymerization occurs as the first and second mixtures of monomers are simultaneously fluxed in the reactor while stirring.Type: GrantFiled: August 24, 1999Date of Patent: December 18, 2001Assignee: Korea Chemical Co., Ltd.Inventors: Jong-Myung Park, Chang-Ho Choi, Jung-Kwon Oh, Seung-Min Hong