Patents by Inventor Dan Feng
Dan Feng 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: 8502782Abstract: An electronic device includes an access control module, a plurality of input areas, and a comparing module. The access control module has a predetermined password. The input areas are configured to be tapped to input characters in the electronic device. The number of the input areas is determined by the number of unique characters of the predetermined password. The comparing module is configured to compare a sequence of the characters entered with the predetermined password.Type: GrantFiled: April 22, 2009Date of Patent: August 6, 2013Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.Inventors: Yi-Fang Wu, Dan-Feng Wu
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Patent number: 8352731Abstract: A secure decentralized storage system provides scalable security by addressing the performance bottleneck of the security manager and the complexity issue of security administration in large-scale storage systems.Type: GrantFiled: April 17, 2009Date of Patent: January 8, 2013Assignee: Huazhong University of Science & TechnologyInventors: Ke Zhou, Dan Feng, Zhongying Niu, Tianming Yang, Qinhua Yan, Dongliang Lei, Wei Yan
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Patent number: 8326591Abstract: In one embodiment of the invention, a method of simulating a circuit is disclosed including partitioning a circuit into a plurality of blocks, each of the plurality of blocks being radio-frequency blocks or non-radio frequency blocks; performing a first simulation of a first simulation type with the radio-frequency blocks to generate output waveforms of the radio-frequency blocks; performing a second simulation of a second simulation type with the non-radio-frequency blocks to generate output waveforms of the non-radio-frequency blocks where the second simulation type differs from the first simulation type; and synchronizing the first simulation and the second simulation together at one or more time steps to generate output waveforms for the circuit.Type: GrantFiled: November 16, 2007Date of Patent: December 4, 2012Assignee: Cadence Design Systems, Inc.Inventors: Qian Cai, Dan Feng, Bruce W. McGaughy, Jun Kong, Rendong Lin
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Patent number: 8195440Abstract: Described is a process for performing an improved mixed frequency-time algorithm to simulate responses of a circuit that receives a periodic sample signal and at least one information signal. The process selects a set of evenly spaced distinct time points and a set of reference time points. Each of the reference points is associated with a distinct time point, and a reference time point is a signal period away from its respective distinct time point. The process finds a first set of relationships between the values at the distinct time points and the values the reference time points. The process also finds a second set of relationships between the values at the distinct time points and the values at the reference time points. The process then combines the first and second sets of relationships to establish a system of nonlinear equations in terms of the values at the distinct time points only. By solving the system of nonlinear equations, the process finds simulated responses of the circuit in time domain.Type: GrantFiled: February 17, 2009Date of Patent: June 5, 2012Assignee: Cadence Design Systems, Inc.Inventors: Dan Feng, Joel R. Phillips, Kenneth Kundert
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Patent number: 7979837Abstract: Methods for analyzing circuit distortion based on contributions from separate circuit elements are presented. Local approximations that do not require high-order derivatives of device models are developed near an operating point for calculating distortion summaries including compression summaries and second-order intermodulation (IM2) distortion summaries.Type: GrantFiled: June 15, 2009Date of Patent: July 12, 2011Assignee: Cadence Design Systems, Inc.Inventors: Fangyi Rao, Dan Feng
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Publication number: 20110167113Abstract: A method for managing an object-based storage system is provided. The object-based storage system includes root objects, partition objects, collection objects, user objects and function objects. The function objects include user function objects and system function objects. The user function objects respond to the client request, so that the existing data-processing tasks requested by the client are moved to the OBSD to be completed, so as to achieve the purposes for saving the network storage bandwidth and improving the security of the stored data, etc. The system function objects execute the system management function, so that the management of the bottom of disks management of the file system and database system is completed by the OBSD. That can be easily realized in automatic data backup, load balancing and other functions in the storage system. The user function objects and system function objects can be customized by the user.Type: ApplicationFiled: October 7, 2008Publication date: July 7, 2011Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGYInventors: Dan Feng, Liping Pang, Yulai Xie, Fang Wang, Zhongying Niu, Ke Zhou, Juan Wang, Yinliang Yue, Xudong Tu, Shuibing He, Chengtao Lu
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Patent number: 7774176Abstract: A pertubative approach based on the Born approximation resolves weakly nonlinear circuit models without requiring explicit high-order device derivatives. Convergence properties and the relation to Volterra series are discussed. According to the disclosed methods, second and third order intermodulation products (IM2, IM3) and intercept points (IP2, IP3) can be calculated by second and third order Born approximations under weakly nonlinear conditions. A diagrammatic representation of nonlinear interactions is presented. Using this diagrammatic technique, both Volterra series and Born approximations can be constructed in a systematic way. The method is generalized to calculate other high-order nonlinear effects such as IMn (nth order intermodulation product) and IPn (nth order intermodulation intercept point). In general, the equations are developed in harmonic form and can be implemented in both time and frequency domains for analog and RF circuits.Type: GrantFiled: December 14, 2005Date of Patent: August 10, 2010Assignee: Cadence Design Systems, Inc.Inventors: Fangyi Rao, Dan Feng
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Patent number: 7761279Abstract: In one embodiment of the invention, a method of simulating a circuit is disclosed including simulating an analog component of the circuit over a first simulation time period with a first envelope simulation; adaptively switching from simulating the analog component with the first envelope simulation to simulating the analog component with a transient simulation over a second simulation time period; and adaptively switching from simulating the analog component with the transient simulation to simulating the analog component with a second envelope simulation over a third simulation time period. The adaptive switching from the first envelope simulation to the transient simulation may be in response to the envelope simulation accuracy falling below a predetermined level of accuracy in comparison with a transient simulation or in response to the second simulation time period including expected digital transitions where one or more digital events may occur to change the analog input signals to the analog component.Type: GrantFiled: November 16, 2007Date of Patent: July 20, 2010Assignee: Cadence Design Systems, Inc.Inventors: Qian Cai, Dan Feng
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Publication number: 20100097320Abstract: An electronic device includes an access control module, a plurality of input areas, and a comparing module. The access control module has a predetermined password. The input areas are configured to be tapped to input characters in the electronic device. The number of the input areas is determined by the number of unique characters of the predetermined password. The comparing module is configured to compare a sequence of the characters entered with the predetermined password.Type: ApplicationFiled: April 22, 2009Publication date: April 22, 2010Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.Inventors: YI-FANG WU, DAN-FENG WU
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Publication number: 20100009658Abstract: A method for identity authentication includes: providing a mobile terminal, displaying a plurality of input areas on the mobile terminal, inputting a password to the mobile terminal by tapping the input areas in a proper sequence with fingers of a user, and identifying fingerprints of the fingers on the input areas while inputting the password.Type: ApplicationFiled: September 30, 2008Publication date: January 14, 2010Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.Inventors: YI-FANG WU, DAN-FENG WU
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Publication number: 20100004024Abstract: A portable communication device includes a user interface responsive to user input, a controller, and a time management module coupled to the controller. A schedule tabled is created in accordance with the user input. The time management module periodically checks the schedule table and sends real time signals to the controller. The controller enables and disables the function in accordance with the schedule table. A method for enabling or disabling the functions of the communication device is also disclosed.Type: ApplicationFiled: May 7, 2009Publication date: January 7, 2010Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD ., HON HAI PRECISION INDUSTRY CO., LTD.Inventor: Dan-Feng Wu
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Publication number: 20090299699Abstract: An audio testing system includes a computer and a mobile terminal. The computer includes a first audio recording and storing module, and a testing module. A first audio file is stored in the computer. The mobile terminal includes a second audio recording and storing module, and a second playing module. The testing module starts up the second recording and storing module to record and store the first audio file as a second audio file, starts up the second audio playing module to play the second audio file, and starts up the first audio recording and storing module to record and store the second audio file as a third audio file in the computer. The computer compares a waveform of the third audio file with a waveform of the first audio file to determine if an audio of the mobile terminal meets a standard.Type: ApplicationFiled: December 12, 2008Publication date: December 3, 2009Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) Co., LTD., HON HAI PRECISION INDUSTRY CO., LTD.Inventor: DAN-FENG WU
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Publication number: 20090282240Abstract: A secure decentralized storage system provides scalable security by addressing the performance bottleneck of the security manager and the complexity issue of security administration in large-scale storage systems.Type: ApplicationFiled: April 17, 2009Publication date: November 12, 2009Applicant: HUAZHONG UNIVERSITY OF SCIENCE & TECHNOLOGYInventors: KE ZHOU, Dan Feng, Zhongying Niu, Tianming Yang, Qinhua Yan, Dongliang Lei, Wei Yan
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Publication number: 20090281771Abstract: A testing system for mobile phones includes at least one workstation (112), at least one computer (110) connected to each workstation and a central server (100) connected to each computer. Each workstation is capable of interfacing with a to-be-tested mobile phone. Each computer includes a testing data collection module and a testing data uploading module. The testing data collection module is capable of collecting the testing data from the to-be-tested mobile phone. The testing data uploading module is capable of uploading the testing data to the central server. The central server is capable of receiving the testing data and analyzing the testing data.Type: ApplicationFiled: July 9, 2008Publication date: November 12, 2009Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.Inventors: QING-HUA LIU, DAN-FENG WU
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Publication number: 20090210202Abstract: Described is a process for performing an improved mixed frequency-time algorithm to simulate responses of a circuit that receives a periodic sample signal and at least one information signal. The process selects a set of evenly spaced distinct time points and a set of reference time points. Each of the reference points is associated with a distinct time point, and a reference time point is a signal period away from its respective distinct time point. The process finds a first set of relationships between the values at the distinct time points and the values the reference time points. The process also finds a second set of relationships between the values at the distinct time points and the values at the reference time points. The process then combines the first and second sets of relationships to establish a system of nonlinear equations in terms of the values at the distinct time points only. By solving the system of nonlinear equations, the process finds simulated responses of the circuit in time domain.Type: ApplicationFiled: February 17, 2009Publication date: August 20, 2009Applicant: CADENCE DESIGN SYSTEMS, INC.Inventors: Dan Feng, Joel R. Phillips, Kenneth Kundert
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Patent number: 7571401Abstract: Methods for analyzing circuit distortion based on contributions from separate circuit elements are presented. Local approximations that do not require high-order derivatives of device models are developed near an operating point for calculating distortion summaries including compression summaries and second-order intermodulation (IM2) distortion summaries.Type: GrantFiled: December 14, 2006Date of Patent: August 4, 2009Inventors: Fangyi Rao, Dan Feng
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Patent number: 7493240Abstract: Described is a process for performing an improved mixed frequency-time algorithm to simulate responses of a circuit that receives a periodic sample signal and at least one information signal. The process selects a set of evenly spaced distinct time points and a set of reference time points. Each of the reference points is associated with a distinct time point, and a reference time point is a signal period away from its respective distinct time point. The process finds a first set of relationships between the values at the distinct time points and the values at the reference time points. The process also finds a second set of relationships between the values at the distinct time points and the values at the reference time points. The process then combines the first and second sets of relationships to establish a system of nonlinear equations in terms of the values at the distinct time points only. By solving the system of nonlinear equations, the process finds simulated responses of the circuit in time domain.Type: GrantFiled: May 15, 2000Date of Patent: February 17, 2009Assignee: Cadence Design Systems, Inc.Inventors: Dan Feng, Joel R. Phillips, Kenneth Kundert
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Publication number: 20070284139Abstract: An integrated circuit package system is provided including providing an integrated circuit die, forming an encapsulation over the integrated circuit die, and sawing the encapsulation with a multi-level saw.Type: ApplicationFiled: June 11, 2007Publication date: December 13, 2007Inventors: Chee Keong Chin, Yu Feng Feng, Dan Feng Zhu, Feng Yao
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Publication number: 20070136045Abstract: A pertubative approach based on the Born approximation resolves weakly nonlinear circuit models without requiring explicit high-order device derivatives. Convergence properties and the relation to Volterra series are discussed. According to the disclosed methods, second and third order intermodulation products (IM2, IM3) and intercept points (IP2, IP3) can be calculated by second and third order Born approximations under weakly nonlinear conditions. A diagrammatic representation of nonlinear interactions is presented. Using this diagrammatic technique, both Volterra series and Born approximations can be constructed in a systematic way. The method is generalized to calculate other high-order nonlinear effects such as IMn (nth order intermodulation product) and IPn (nth order intermodulation intercept point). In general, the equations are developed in harmonic form and can be implemented in both time and frequency domains for analog and RF circuits.Type: ApplicationFiled: December 14, 2005Publication date: June 14, 2007Applicant: Cadence Design Systems, Inc.Inventors: Fangyi Rao, Dan Feng
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Patent number: D592409Type: GrantFiled: June 20, 2008Date of Patent: May 19, 2009Assignee: Hon Hai Precision Industry Co., Ltd.Inventor: Dan-Feng Wu