Ki J Lee

6373253, Apr 16, 2002

Jan 8, 1999

09/227463

Ki Ha Lee - Lafayette CA

The Regents of the University of California - Oakland CA

G01V 308

324344, 324258, 324 72

A simple and compact method and apparatus for detecting high frequency electric fields, particularly in the frequency range of 1 MHz to 100 MHz, uses a compact toroidal antenna. For typical geophysical applications the sensor will be used to detect electric fields for a wide range of spectrum starting from about 1 MHz, in particular in the frequency range between 1 to 100 MHz, to detect small objects in the upper few meters of the ground. Time-varying magnetic fields associated with time-varying electric fields induce an emf (voltage) in a toroidal coil. The electric field at the center of (and perpendicular to the plane of) the toroid is shown to be linearly related to this induced voltage. By measuring the voltage across a toroidal coil one can easily and accurately determine the electric field.

6636046, Oct 21, 2003

Oct 15, 2001

09/976860

Ki Ha Lee - Lafayette CA
Alex Becker - El Cerrito CA
Boris A. Faybishenko - Berkeley CA
Ray D. Solbau - Martinez CA

The Regents of the University of California - Oakland CA

G01V 302

324347, 324355

A miniaturized electrical resistivity (ER) probe based on a known current-voltage (I-V) electrode structure, the Wenner array, is designed for local (point) measurement. A pair of voltage measuring electrodes are positioned between a pair of current carrying electrodes. The electrodes are typically about 1 cm long, separated by 1 cm, so the probe is only about 1 inch long. The electrodes are mounted to a rigid tube with electrical wires in the tube and a sand bag may be placed around the electrodes to protect the electrodes. The probes can be positioned in a borehole or on the surface. The electrodes make contact with the surrounding medium. In a dual mode system, individual probes of a plurality of spaced probes can be used to measure local resistance, i. e. point measurements, but the system can select different probes to make interval measurements between probes and between boreholes.

6999880, Feb 14, 2006

Mar 11, 2004

10/799131

Ki Ha Lee - Lafayette CA, US

The Regents of the University of California - Oakland CA

G01V 1/28

702 14, 702 13

A set of seismic trace data is collected in an input data set that is first Fourier transformed in its entirety into the frequency domain. A normalized wavefield is obtained for each trace of the input data set in the frequency domain. Normalization is done with respect to the frequency response of a reference trace selected from the set of seismic trace data. The normalized wavefield is source independent, complex, and dimensionless. The normalized wavefield is shown to be uniquely defined as the normalized impulse response, provided that a certain condition is met for the source. This property allows construction of the inversion algorithm disclosed herein, without any source or source coupling information. The algorithm minimizes the error between data normalized wavefield and the model normalized wavefield. The methodology is applicable to any -D seismic problem, and damping may be easily included in the process.

53734432, Dec 13, 1994

Oct 6, 1993

8/132408

Ki H. Lee - Lafayette CA
Gan Q. Xie - Berkeley CA

The Regents, University of California - Oakland CA

G01V 308
G01V 318

364420

A method for imaging with low frequency electromagnetic fields, and for interpreting the electromagnetic data using ray tomography, in order to determine the earth conductivity with high accuracy and resolution. The imaging method includes the steps of placing one or more transmitters, at various positions in a plurality of transmitter holes, and placing a plurality of receivers in a plurality of receiver holes. The transmitters generate electromagnetic signals which diffuse through a medium, such as earth, toward the receivers. The measured diffusion field data H is then transformed into wavefield data U. The traveltimes corresponding to the wavefield data U, are then obtained, by charting the wavefield data U, using a different regularization parameter. alpha. for each transform. The desired property of the medium, such as conductivity, is then derived from the velocity, which in turn is constructed from the wavefield data U using ray tomography.

20210399978, Dec 23, 2021

Mar 13, 2020

16/818862

- Palo Alto CA, US
Ao TANG - San Francisco CA, US
Victor de Souza Lima e SILVA - San Francisco CA, US
Thiago Sousa SANTOS - San Francisco CA, US
Ning WU - San Francisco CA, US
Archit BAWEJA - San Francisco CA, US
Ki Suh LEE - San Francisco CA, US
Yao WANG - San Francisco CA, US
Andrey GUSHCHIN - San Francisco CA, US
Sakethnath ARE - San Francisco CA, US

H04L 12/707
H04L 12/26
H04L 12/741

A system of nodes configured to form a network comprising virtual links in an overlay network provisioned over an underlay network including servers of a public network. The system includes virtual routers (VRs) at each node. Each VR is coupled to the network and to a tenant of the node, and configured to form in the network a set of virtual links corresponding to the tenant. One or more VRs includes a feedback control system comprising an objective function that characterizes the network. The VR is configured to receive link state data of the set of virtual links and control routing of a tenant traffic flow of each tenant according to a best route of the network determined by the objective function using the link state data.

20210377156, Dec 2, 2021

Apr 26, 2021

17/240890

- Palo Alto CA, US
Ao Tang - San Francisco CA, US
Victor de Souza Lima e Silva - San Francisco CA, US
Thiago Sousa Santos - San Francisco CA, US
Ning Wu - San Francisco CA, US
Archit Baweja - San Francisco CA, US
Ki Suh Lee - San Francisco CA, US
Yao Wang - San Francisco CA, US
Andrey Gushchin - San Francisco CA, US
Sakethnath Are - San Francisco CA, US

H04L 12/707
H04L 12/26
H04L 12/741

A system comprising nodes coupled to a network including virtual links in an overlay network provisioned over an underlay network. The system includes a virtual machine (VM) provisioned at a node and coupled to the network. The VM is configured to receive feedback data of link conditions, and use the feedback data to dynamically determine and adapt an optimal route through the network. The VM is configured to control routing of traffic flows using the optimal route. The routing includes split routing of a traffic flow from the node via two or more of the virtual links.

20200296026, Sep 17, 2020

Dec 2, 2018

16/207155

- San Francisco CA, US
Ao TANG - San Francisco CA, US
Victor SILVA - San Francisco CA, US
Thiago Sousa SANTOS - San Francisco CA, US
Ning WU - San Francisco CA, US
Archit BAWEJA - San Francisco CA, US
Ki Suh LEE - San Francisco CA, US
Yao WANG - San Francisco CA, US
Andrey GUSHCHIN - San Francisco CA, US
Sakethnath ARE - San Francisco CA, US

H04L 12/707
H04L 12/26
H04L 12/741

A system comprising nodes configured to form a network comprising virtual links in an overlay network provisioned over an underlay network. The system includes at least one virtual machine (VM) at each node. The VM is coupled to the network and to a tenant of the node. The VM includes routing algorithms representing routing behaviors. At least one routing algorithm is configured to use feedback data of a set of virtual links to determine and continually adapt an optimal route through the network. The VM is configured to control routing of traffic flows according to the optimal route.

20200106696, Apr 2, 2020

Apr 9, 2019

16/378771

- San Francisco CA, US
Ao TANG - San Francisco CA, US
Victor de Souza Lima e SILVA - San Francisco CA, US
Thiago Sousa SANTOS - San Francisco CA, US
Ning WU - San Francisco CA, US
Archit BAWEJA - San Francisco CA, US
Ki Suh LEE - San Francisco CA, US
Yao WANG - San Francisco CA, US
Andrey GUSHCHIN - San Francisco CA, US
Sakethnath ARE - San Francisco CA, US

H04L 12/707
H04L 12/26
H04L 12/741

A method comprising instantiating at least one virtual machine (VM) at each node of nodes that form a network comprising virtual links in an overlay network provisioned over an underlay network. The VM is coupled to the network and to a tenant of the node. The method comprises configuring the VM to include at least one routing algorithm representing at least one routing behavior. The method comprises configuring the routing algorithm to use feedback data of a set of the virtual links to determine and adapt an optimal route through the network. The method comprises configuring the VM to control routing of traffic flows according to the optimal route.