Patents by Inventor Erdong Chen
Erdong Chen 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).
-
Patent number: 11476774Abstract: Disclosed are a control method and control system for a modular multilevel converter and a power transmission system. The control method comprises: calculating an actual capacitor voltage and a reference capacitor voltage of the sub-module; dividing the plurality of sub-modules into a plurality of modules, wherein reference capacitor voltages of the sub-modules in the same module are the same, and reference capacitor voltages of the sub-modules among different modules are different; obtaining a first voltage sequence and a second voltage sequence; and determining the sub-modules to be switched on or switched off according to charging and discharging states of the sub-modules, the first voltage sequence and the second voltage sequence, until an actual level of the bridge arm is consistent with a desired level, wherein the desired level changes taking an insert value selected from a combination of one or more elements in a collection {INTERk} as a step.Type: GrantFiled: May 31, 2021Date of Patent: October 18, 2022Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Yi Zhang, Zhao Wang, Erdong Chen
-
Patent number: 11476773Abstract: Disclosed are a control method and control system for a modular multilevel converter and a power transmission system. The control method includes calculating an actual capacitor voltage of the sub-module; calculating a reference capacitor voltage of the sub-module; dividing the plurality of sub-modules into a plurality of modules, reference capacitor voltages of the sub-modules in the same module are the same, and reference capacitor voltages of the sub-modules from different modules are different; sorting in the module to obtain a first voltage sequence; sorting among different modules to obtain a second voltage sequence; and determining the sub-modules to be switched on or switched off according to charging and discharging states of the sub-module, the first voltage sequence and the second voltage sequence, until an actual level of the bridge arm is consistent with a desired level, wherein the desired level changes using a first preset value as a step.Type: GrantFiled: May 30, 2021Date of Patent: October 18, 2022Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.Inventors: Jianping Ying, Yi Zhang, Zhao Wang, Erdong Chen
-
Patent number: 11425073Abstract: Embodiments are provided for reducing unwanted messages or spam within a real-time social networking service. According to certain aspects, a synchronous analysis module may operate in coordination with an asynchronous analysis module. Each of the synchronous analysis module and the asynchronous analysis module analyzes an incoming message from a user account to determine whether the incoming message has characteristics of spam, whereby the synchronous analysis is at a lower latency than the asynchronous analysis. The asynchronous analysis is afforded the ability to identify certain spam characteristics that the synchronous analysis may identify during its lower latency analysis.Type: GrantFiled: September 28, 2020Date of Patent: August 23, 2022Assignee: Twitter, Inc.Inventors: Raghav Jeyaraman, Arjun Maheswaran, Erdong Chen
-
Publication number: 20210376759Abstract: Disclosed are a control method and control system for a modular multilevel converter and a power transmission system. The control method comprises: calculating an actual capacitor voltage and a reference capacitor voltage of the sub-module; dividing the plurality of sub-modules into a plurality of modules, wherein reference capacitor voltages of the sub-modules in the same module are the same, and reference capacitor voltages of the sub-modules among different modules are different; obtaining a first voltage sequence and a second voltage sequence; and determining the sub-modules to be switched on or switched off according to charging and discharging states of the sub-modules, the first voltage sequence and the second voltage sequence, until an actual level of the bridge arm is consistent with a desired level, wherein the desired level changes taking an insert value selected from a combination of one or more elements in a collection {INTERk} as a step.Type: ApplicationFiled: May 31, 2021Publication date: December 2, 2021Inventors: Yi ZHANG, Zhao WANG, Erdong CHEN
-
Publication number: 20210376758Abstract: Disclosed are a control method and control system for a modular multilevel converter and a power transmission system. The control method comprises: calculating an actual capacitor voltage of the sub-module; calculating a reference capacitor voltage of the sub-module; dividing the plurality of sub-modules into a plurality of modules, reference capacitor voltages of the sub-modules in the same module are the same, and reference capacitor voltages of the sub-modules from different modules are different; sorting in the module to obtain a first voltage sequence; sorting among different modules to obtain a second voltage sequence; and determining the sub-modules to be switched on or switched off according to charging and discharging states of the sub-module, the first voltage sequence and the second voltage sequence, until an actual level of the bridge arm is consistent with a desired level, wherein the desired level changes using a first preset value as a step.Type: ApplicationFiled: May 30, 2021Publication date: December 2, 2021Inventors: Jianping YING, Yi ZHANG, Zhao WANG, Erdong CHEN
-
Publication number: 20210119952Abstract: Embodiments are provided for reducing unwanted messages or spam within a real-time social networking service. According to certain aspects, a synchronous analysis module may operate in coordination with an asynchronous analysis module. Each of the synchronous analysis module and the asynchronous analysis module analyzes an incoming message from a user account to determine whether the incoming message has characteristics of spam, whereby the synchronous analysis is at a lower latency than the asynchronous analysis. The asynchronous analysis is afforded the ability to identify certain spam characteristics that the synchronous analysis may identify during its lower latency analysis.Type: ApplicationFiled: September 28, 2020Publication date: April 22, 2021Inventors: Raghav Jeyaraman, Arjun Maheswaran, Erdong Chen
-
Patent number: 10816696Abstract: The application relates to radars, and provides a chip with a beamforming network based on a photonic crystal resonant cavity tree structure and a fabrication method thereof. The chip includes a beamforming network layer, including an incidence coupling grating, first to Nth photonic crystal resonant cavity combinations, first to (N+1)th optical waveguides and an emergence coupling grating which are successively connected; branches of each photonic crystal resonant cavity combination is an integral multiple of that of the previous photonic crystal resonant cavity combination, and two photonic crystal resonant cavity combinations are connected by an optical waveguide.Type: GrantFiled: October 24, 2019Date of Patent: October 27, 2020Assignee: 38th Research Institute Of China Electronics Technology Group Corp.Inventors: Xueming Jin, Naidi Cui, Jin Guo, Junbo Feng, Yuankui Hu, Heng Zhao, Li Jin, Erdong Chen
-
Patent number: 10791079Abstract: Embodiments are provided for reducing unwanted messages or spam within a real-time social networking service. According to certain aspects, a synchronous analysis module may operate in coordination with an asynchronous analysis module. Each of the synchronous analysis module and the asynchronous analysis module analyzes an incoming message from a user account to determine whether the incoming message has characteristics of spam, whereby the synchronous analysis is at a lower latency than the asynchronous analysis. The asynchronous analysis is afforded the ability to identify certain spam characteristics that the synchronous analysis may identify during its lower latency analysis.Type: GrantFiled: December 3, 2018Date of Patent: September 29, 2020Assignee: Twitter, Inc.Inventors: Raghav Jeyaraman, Arjun Maheswaran, Erdong Chen
-
Publication number: 20200081155Abstract: The application relates to radars, and provides a chip with a beamforming network based on a photonic crystal resonant cavity tree structure and a fabrication method thereof. The chip includes a beamforming network layer, including an incidence coupling grating, first to Nth photonic crystal resonant cavity combinations, first to (N+1)th optical waveguides and an emergence coupling grating which are successively connected; branches of each photonic crystal resonant cavity combination is an integral multiple of that of the previous photonic crystal resonant cavity combination, and two photonic crystal resonant cavity combinations are connected by an optical waveguide.Type: ApplicationFiled: October 24, 2019Publication date: March 12, 2020Inventors: Xueming JIN, Naidi CUI, Jin GUO, Junbo FENG, Yuankui HU, Heng ZHAO, Li JIN, Erdong CHEN
-
Publication number: 20190190866Abstract: Embodiments are provided for reducing unwanted messages or spam within a real-time social networking service. According to certain aspects, a synchronous analysis module may operate in coordination with an asynchronous analysis module. Each of the synchronous analysis module and the asynchronous analysis module analyzes an incoming message from a user account to determine whether the incoming message has characteristics of spam, whereby the synchronous analysis is at a lower latency than the asynchronous analysis. The asynchronous analysis is afforded the ability to identify certain spam characteristics that the synchronous analysis may identify during its lower latency analysis.Type: ApplicationFiled: December 3, 2018Publication date: June 20, 2019Inventors: Raghav Jeyaraman, Arjun Maheswaran, Erdong Chen
-
Patent number: 10148606Abstract: Embodiments are provided for reducing unwanted messages or spam within a real-time social networking service. According to certain aspects, a synchronous analysis module may operate in coordination with an asynchronous analysis module. Each of the synchronous analysis module and the asynchronous analysis module analyzes an incoming message from a user account to determine whether the incoming message has characteristics of spam, whereby the synchronous analysis is at a lower latency than the asynchronous analysis. The asynchronous analysis is afforded the ability to identify certain spam characteristics that the synchronous analysis may identify during its lower latency analysis.Type: GrantFiled: December 18, 2014Date of Patent: December 4, 2018Assignee: Twitter, Inc.Inventors: Raghav Jeyaraman, Arjun Maheswaran, Erdong Chen
-
Publication number: 20160028673Abstract: Embodiments are provided for reducing unwanted messages or spam within a real-time social networking service. According to certain aspects, a synchronous analysis module may operate in coordination with an asynchronous analysis module. Each of the synchronous analysis module and the asynchronous analysis module analyzes an incoming message from a user account to determine whether the incoming message has characteristics of spam, whereby the synchronous analysis is at a lower latency than the asynchronous analysis. The asynchronous analysis is afforded the ability to identify certain spam characteristics that the synchronous analysis may identify during its lower latency analysis.Type: ApplicationFiled: December 18, 2014Publication date: January 28, 2016Inventors: Raghav Jeyaraman, Arjun Maheswaran, Erdong Chen
-
Patent number: 9130997Abstract: Behavior of an online system is modified dynamically using feature expressions and feature loops. A feature expression can be expressed as a combination of other features or feature expressions, thereby allowing specification of complex features. The sets of feature expressions and policies of an online system can be modified while the online system is running. Feature loops aggregate values of a feature expression across a plurality of actions, for example, number of occurrences of an event over a time interval. The online system evaluates a set of feature expressions in response to actions performed by users. Feature expressions are used to specify policies that determine how the online system reacts to certain types of user actions. The ability to dynamically modify the feature expressions and policies of the online system allows the online system to adapt to attacks by malicious users in a timely manner.Type: GrantFiled: June 4, 2014Date of Patent: September 8, 2015Assignee: Facebook, Inc.Inventors: Christopher Alexander Stein, Karan Mangla, Zhimin Chen, Erdong Chen
-
Publication number: 20140289795Abstract: Behavior of an online system is modified dynamically using feature expressions and feature loops. A feature expression can be expressed as a combination of other features or feature expressions, thereby allowing specification of complex features. The sets of feature expressions and policies of an online system can be modified while the online system is running. Feature loops aggregate values of a feature expression across a plurality of actions, for example, number of occurrences of an event over a time interval. The online system evaluates a set of feature expressions in response to actions performed by users. Feature expressions are used to specify policies that determine how the online system reacts to certain types of user actions. The ability to dynamically modify the feature expressions and policies of the online system allows the online system to adapt to attacks by malicious users in a timely manner.Type: ApplicationFiled: June 4, 2014Publication date: September 25, 2014Inventors: Christopher Alexander Stein, Karan Mangla, Zhimin Chen, Erdong Chen
-
Patent number: 8799987Abstract: Behavior of an online system is modified dynamically using feature expressions and feature loops. A feature expression can be expressed as a combination of other features or feature expressions, thereby allowing specification of complex features. The sets of feature expressions and policies of an online system can be modified while the online system is running. Feature loops aggregate values of a feature expression across a plurality of actions, for example, number of occurrences of an event over a time interval. The online system evaluates a set of feature expressions in response to actions performed by users. Feature expressions are used to specify policies that determine how the online system reacts to certain types of user actions. The ability to dynamically modify the feature expressions and policies of the online system allows the online system to adapt to attacks by malicious users in a timely manner.Type: GrantFiled: December 5, 2011Date of Patent: August 5, 2014Assignee: Facebook, Inc.Inventors: Christopher Alexander Stein, Karan Mangla, Zhimin Chen, Erdong Chen
-
Publication number: 20130145418Abstract: Behavior of an online system is modified dynamically using feature expressions and feature loops. A feature expression can be expressed as a combination of other features or feature expressions, thereby allowing specification of complex features. The sets of feature expressions and policies of an online system can be modified while the online system is running. Feature loops aggregate values of a feature expression across a plurality of actions, for example, number of occurrences of an event over a time interval. The online system evaluates a set of feature expressions in response to actions performed by users. Feature expressions are used to specify policies that determine how the online system reacts to certain types of user actions. The ability to dynamically modify the feature expressions and policies of the online system allows the online system to adapt to attacks by malicious users in a timely manner.Type: ApplicationFiled: December 5, 2011Publication date: June 6, 2013Inventors: Christopher Alexander Stein, Karan Mangla, Zhimin Chen, Erdong Chen