Zhong K Chen

US Patent:

55281494, Jun 18, 1996

Filed:

Dec 23, 1994

Appl. No.:

8/363670

Inventors:

Zhong X. Chen - Shrewsbury MA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01M 1044

US Classification:

324433

Abstract:

A test circuit for a back-up battery includes a main switch which connects a main power source to a load, and a diode which is interposed between a back-up battery and the load. The diode is reversed biased when the main power source supplies rated power to the load. To test the battery, the main switch is turned off such that the back-up battery supplies operating current to the load via the diode. During a test interval, the output voltage is monitored to determine if the battery is able to supply its rated voltage under load. After the test or if the battery fails to supply requisite voltage, the main switch is turned-on again.

US Patent:

57265739, Mar 10, 1998

Filed:

Sep 15, 1995

Appl. No.:

8/529122

Inventors:

Zhong Xi Chen - Shrewsbury MA
Thomas Thai Do - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01M 1044

US Classification:

324429

Abstract:

A circuit tests a back-up battery for a power supply. A power source is coupled to a load to deliver power at a normal rated voltage during normal operation. However, during a battery test interval, the power source voltage is lowered to a test mode voltage. This lowers the load voltage, and in response, the circuit attempts to supply the load from the battery. The load voltage is monitored during the test interval to determine if the battery is able to supply rated power. However, the main power source is still instantly available at the test mode voltage to drive the load if the battery fails during the battery test interval. This ensures uninterrupted operation during the test mode. Upon failure of the battery during the test mode, the power supply is quickly ramped up to the normal rated voltage (although the test mode voltage meets output specifications).

US Patent:

53768310, Dec 27, 1994

Filed:

Sep 24, 1993

Appl. No.:

8/126283

Inventors:

Zhong X. Chen - Framingham MA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H03K 1700
H03L 500

US Classification:

327379

Abstract:

A switch circuit controllably supplies initial current from a power supply to a load to prevent a current surge when the switch circuit is "hot-plugged" or when power is first applied to the switch circuit. The circuit comprises an output transistor having a first port for connection to a load, a second port for connection to the power supply and a third port for on/off control. A first resistor is connected between the second and third ports. A second resistor and a first capacitor are connected in series with each other between the first and third ports. The second resistor is large enough such that the transistor is biased off when the power supply is first connected to the second port. A timer changes the voltage at the third port a predetermined time after application of the power supply to the second port so as to bias the output transistor to begin a limited conduction of current between the first and second ports. This current increases in a controlled manner as the capacitor discharges until the output transistor is turned-on fully to supply operating current.

US Patent:

20190028349, Jan 24, 2019

Filed:

Jul 24, 2017

Appl. No.:

15/657716

Inventors:

- Arlington MA, US
Zhong Chen - Acton MA, US
Matthew J. Threefoot - Columbia MD, US

International Classification:

H04L 12/24
H04L 29/12

Abstract:

A network device stores capability designations associated with Internet-of-Things (IoT) devices and receives, from a customer device, one or more of the capability designations associated with a first type of IoT device. The network device receives event data generated by the first type of IoT device and maps the event data to the one or more of the capability designations. The mapping produces normalized IoT data for the first type of IoT device. The network device generates semantic information for the normalized IoT data and assembles a device model for the first type of IoT device. The device model includes the one or more of the capability designations and the semantic information.

US Patent:

20180212970, Jul 26, 2018

Filed:

Jan 20, 2017

Appl. No.:

15/410863

Inventors:

- Arlington VA, US
Zhong Chen - Acton MA, US
Lin Zhu - Lexington MA, US
Jianxiu Hao - Acton MA, US

International Classification:

H04L 29/06
H04L 9/08

Abstract:

A network device receives, from a node in an Internet-of-Things (IoT) network, an access request for a user authenticated via the node and identifies the access request as from either of a trusted node or an untrusted node in the IoT network. When the access request is from an untrusted node, the network device identifies a hash key for the access request, wherein the hash key is derived from an access list for the IoT network; broadcasts the hash key to other trusted nodes in the IoT network; and validates the access request based on a solution consensus from the other trusted nodes. When the access request is from a trusted node, the network device confirms mutual trust with the trusted node via an encrypted key exchange, and validates the access request based on the mutual trust with the trusted node.

US Patent:

20180102916, Apr 12, 2018

Filed:

Oct 7, 2016

Appl. No.:

15/288335

Inventors:

- Arlington VA, US
Jianxiu Hao - Acton MA, US
Zhong Chen - Acton MA, US
Dahai Ren - Lincoln MA, US

International Classification:

H04L 12/46
H04L 29/08
G06F 17/30

Abstract:

A network device receives a plurality of framework definitions corresponding to a respective plurality of device platforms, wherein each of the device platforms comprises at least one device. The network device generates a plurality of generalized framework definitions for each of the plurality of device platforms, wherein the plurality of generalized framework definitions comprise basic linguistic components corresponding to elements in the respective plurality of framework definitions. The network device receives data from the at least one device for each of the device platforms. The network device extracts data from the received data based on the plurality of generalized framework definitions. The network device automatically identifies contexts that include at least one device for each of the at least two device platforms based on the extracted data. The network device transmits instructions to the at least one device for each of the at least two device platforms based on one of a rule or a request associated with the identified one or more contexts.

US Patent:

20170359237, Dec 14, 2017

Filed:

Jun 13, 2016

Appl. No.:

15/180361

Inventors:

- Arlington VA, US
Zhong Chen - Acton MA, US
Lin Zhu - Lexington MA, US
Ming Chen - Bedford MA, US

International Classification:

H04L 12/26
H04L 29/08

Abstract:

A network device logs transmission control protocol (TCP) flow data for connections between registered devices that are registered for use of secure Internet of Things (IoT) application programming interfaces (APIs). The logging generates logged flow data. The network device receives, from a first registered device, a call validation request for an IoT API call directed to the first registered device from a second registered device. The call validation request includes packet information of the IoT API call. The network device compares the packet information with the logged TCP flow data. When the comparing indicates a match of the packet information and the logged TCP flow data, the network device sends a response to the first registered device to accept the IoT API call. Otherwise, the network device sends a response to the first registered device to reject the IoT API call.

US Patent:

20170359417, Dec 14, 2017

Filed:

Jun 13, 2016

Appl. No.:

15/180629

Inventors:

- Arlington VA, US
Jianxiu Hao - Acton MA, US
Zhong Chen - Acton MA, US
Matthew J. Threefoot - Columbia MD, US

International Classification:

H04L 29/08
H04W 60/04
H04W 4/00

Abstract:

A network device receives a definition for a data product of consumer Internet-of-Things (IoT) data and registers multiple machine-type communications (MTC)-devices for collection of consumer IoT data. The MTC devices provide the consumer IoT data with heterogeneous formats. The registering identifies a profile for each MTC device and particular data types authorized for collection. The network device receives consumer IoT data generated by the multiple MTC devices and extracts the particular data types from the IoT data. The network device normalizes the extracted data to include a uniform data format, and aggregates the normalized IOT data into clusters that exclude device identifiers. The network device constructs the clusters into a data portfolio that meets the definition for the data product.