Patents by Inventor Qun Zang
Qun Zang 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: 9542963Abstract: A first adaptive fly height measurement is performed between a read/write head and a recording medium during a stage of qualification testing of a magnetic disk drive. A second adaptive fly height measurement of the read/write head is performed during a subsequent stage of the qualification testing. In response to determining that a fly height decrease between the first and second adaptive fly height measurements is above a threshold value, a mitigation operation is performed to remove a contaminant from a media-facing surface of the read/write head.Type: GrantFiled: March 18, 2015Date of Patent: January 10, 2017Assignee: SEAGATE TECHNOLOGY LLCInventors: Qun Zang, Meherab Amaria, Ying Lin, Aaron Jacobs, Daniel Brown
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Publication number: 20160275978Abstract: A first adaptive fly height measurement is performed between a read/write head and a recording medium during a stage of qualification testing of a magnetic disk drive. A second adaptive fly height measurement of the read/write head is performed during a subsequent stage of the qualification testing. In response to determining that a fly height decrease between the first and second adaptive fly height measurements is above a threshold value, a mitigation operation is performed to remove a contaminant from a media-facing surface of the read/write head.Type: ApplicationFiled: March 18, 2015Publication date: September 22, 2016Inventors: Qun Zang, Meherab Amaria, Ying Lin, Aaron Jacobs, Daniel Brown
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Patent number: 7672230Abstract: A dynamic channel change technique is disclosed which may be implemented between nodes and a Head End of an access network. Initially a network device may communicate with the Head End via a first downstream channel and a first upstream channel. When the network device receives a dynamic channel change request which includes instructions for the network device to switch to a second downstream channel, the network device may respond by switching from the first downstream channel to the second downstream channel. Thereafter, the network device may communicate with the Head End via the second downstream channel and first upstream channel. Further, according to a specific embodiment, the dynamic channel change request may also include an upstream channel change request for causing the network device to switch from a first upstream channel to a second upstream channel.Type: GrantFiled: July 10, 2006Date of Patent: March 2, 2010Assignee: Cisco Technology, Inc.Inventors: John T. Chapman, Daniel W. Crocker, Feisal Y. Daruwalla, Joanna Qun Zang, Yong Lu
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Patent number: 7656890Abstract: A dynamic channel change technique is disclosed which may be implemented between nodes and a Head End of an access network. Initially a network device may communicate with the Head End via a first downstream channel and a first upstream channel. When the network device receives a dynamic channel change request which includes instructions for the network device to switch to a second downstream channel, the network device may respond by switching from the first downstream channel to the second downstream channel. Thereafter, the network device may communicate with the Head End via the second downstream channel and first upstream channel. Further, according to a specific embodiment, the dynamic channel change request may also include an upstream channel change request for causing the network device to switch from a first upstream channel to a second upstream channel.Type: GrantFiled: July 10, 2006Date of Patent: February 2, 2010Assignee: Cisco Technology, Inc.Inventors: John T. Chapman, Daniel W. Crocker, Feisal Y. Daruwalla, Joanna Qun Zang, Yong Lu
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Patent number: 7113484Abstract: A dynamic channel change technique is disclosed which may be implemented between nodes and a Head End of an access network. Initially a network device may communicate with the Head End via a first downstream channel and a first upstream channel. When the network device receives a dynamic channel change request which includes instructions for the network device to switch to a second downstream channel, the network device may respond by switching from the first downstream channel to the second downstream channel. Thereafter, the network device may communicate with the Head End via the second downstream channel and first upstream channel. Further, according to a specific embodiment, the dynamic channel change request may also include an upstream channel change request for causing the network device to switch from a first upstream channel to a second upstream channel.Type: GrantFiled: June 28, 2000Date of Patent: September 26, 2006Assignee: Cisco Technology, Inc.Inventors: John T. Chapman, Daniel W. Crocker, Feisal Y. Daruwalla, Joanna Qun Zang, Yong Lu
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Patent number: 7068712Abstract: A CMTS redundancy technique requires at least two CMTS interfaces (e.g., line cards) on one or more CMTS chassis at the head end of a cable network. One of the CMTSs serves as a backup or “protecting” CMTS. When another CMTS (a “working” CMTS) becomes unavailable to service its group of cable modems, the protecting CMTS takes over service to those cable modems. The SWITCHOVER takes place transparently (or nearly transparently) to the cable modems. The protecting CMTS provides service on the same downstream channel as used by the working CMTS. The cable modems need not modify any settings pursuant to their cable modem communication protocol (e.g., DOCSIS ranging). This transparency to the cable modems is realized by keeping the working and protecting CMTSs in synchronization regarding service parameters for the cable modems. In other words, the protecting CMTS maintains a list of current parameters for allowing service to the cable modems.Type: GrantFiled: January 18, 2000Date of Patent: June 27, 2006Assignee: Cisco Technology, Inc.Inventors: Joanna Qun Zang, Feisal Daruwalla, James R. Forster, Guenter E. Roeck, Joseph O'Donnell, John Chen, Mark Millet
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Patent number: 7058007Abstract: A protection CMTS is available to immediately service a cable modem should that modem's service from a working CMTS fail for any reason. To speed the service transfer (cutover) from the working CMTS to the protection CMTS, the cable modem may preregister with the protection CMTS well before the cutover becomes necessary. The cable modem's registration with both the working CMTS and the protection CMTS preferably employs a single IP address, so that the cable modem need not obtain a new IP address during cutover. While the cable modem may register with both the working CMTS and the protection CMTS, the devices are designed or configured so that only the working CMTS injects a host route for the cable modem into the appropriate routing protocol. Only after cutover to the protection CMTS does the protection CMTS inject its host route.Type: GrantFiled: January 18, 2000Date of Patent: June 6, 2006Assignee: Cisco Technology, Inc.Inventors: Feisal Daruwalla, James R. Forster, Guenter E. Roeck, Joanna Qun Zang, Yong Lu
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Publication number: 20050208499Abstract: This invention relates to methods, kits and compositions for diagnosing, assessing the prognosis or monitoring the progression of breast or ovarian cancer in a subject. In particular, the invention discloses methods for detecting changes in the expression pattern of CXCL9 and FLJ20174 nucleic acids and gene products as markers for breast and ovarian cancer. Also disclosed are methods and kits for screening compounds for the ability to act as effectors of breast and ovarian cancer and therapeutic agents for the treatment of breast or ovarian cancer that specifically bind CXCL9 or FLJ20174 nucleic acids or gene products.Type: ApplicationFiled: February 4, 2004Publication date: September 22, 2005Inventors: Jonathan Graff, Deborah Ferguson, Qun Zang, Jeffrey Spencer
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Patent number: RE44661Abstract: A protection CMTS is available to immediately service a cable modem should that modem's service from a working CMTS fail for any reason. To speed the service transfer (cutover) from the working CMTS to the protection CMTS, the cable modem may preregister with the protection CMTS well before the cutover becomes necessary. The cable modem's registration with both the working CMTS and the protection CMTS preferably employs a single IP address, so that the cable modem need not obtain a new IP address during cutover. While the cable modem may register with both the working CMTS and the protection CMTS, the devices are designed or configured so that only the working CMTS injects a host route for the cable modem into the appropriate routing protocol. Only after cutover to the protection CMTS does the protection CMTS inject its host route.Type: GrantFiled: December 6, 2006Date of Patent: December 24, 2013Assignee: Cisco Technology, Inc.Inventors: Feisal Daruwalla, James R. Forster, Guenter E. Roeck, John T. Chapman, Joanna Qun Zang, Yong Lu