Sang Hee Kim

6771185, Aug 3, 2004

Feb 3, 1999

09/243451

Chul Jin Yoo - Hoffman Estates IL, 60195
Sang Gook Kim - Streamwood IL, 60107
Daniel Yongsuk Pahng - Skokie IL, 60076

G08G 114

3409322, 340955, 340942, 3405391, 340525, 340958, 701117, 705418

A parking guidance and management system. The system provides graphical information regarding the relative availability of parking spaces within a parking garage or other large facility. The system relies on a pair of sensors in each space which combine to provide highly reliable information regarding whether spaces in the facility are occupied or not. The information is gathered by a series of aisle controllers, which communicate with a central computer. The information is displayed at strategically located displays along the way to available spaces. The displays contain advertising messages adjacent to the information about space availability. The information obtained from the sensors at each parking space may be used to provide information to the manager of the facility regarding space utilization. Information regarding the occupancy status of each space may also be used as a check on receipts of parking fees and to identify abandoned vehicles.

7038743, May 2, 2006

Jan 28, 2004

10/766273

Lachezar Komitov - Gothenburg, SE
Sang Hwa Kim - Kent OH, US

Kent State University - Kent OH
Ecsibeo AB - Goethenburg

G02F 1/1333
C09K 19/02

349 88, 349175, 349185

An electro-optic device includes a liquid crystal cell (′) and at least one electrode (′) arranged to selectively electrically bias the liquid crystal cell (′). A chiral or cholesteric liquid crystal (′) is disposed in the liquid crystal cell (′). The liquid crystal (′) has an optic axis substantially along a selected optic axis direction in the absence of an electrical bias. A polymeric network () is disposed at an inside surface of the liquid crystal cell (′). The polymeric network () extends partway into the liquid crystal cell (′) leaving at least a portion of the liquid crystal cell (′) substantially free of the polymeric network ().

7646185, Jan 12, 2010

Aug 25, 2006

11/467433

Sang Hoon Kim - Grayslake IL, US

Micrel, Inc. - San Jose CA

G05F 1/00

323283, 323222

A synchronous switching regulator controller incorporates a switch detection circuit to determine the presence or absence of a power switch at the output of a switch driver so that the switch driver can be disabled when it is left unused. In one embodiment, the synchronous controller includes a switch detection circuit receiving a power cycle signal and the PWM ramp clock signal and measuring a voltage at an output node of the switch driver. The switch detection circuit provides a driver enable signal in response to the assertion of the power cycle signal. The driver enable signal has a first logical state when the voltage at the output node of the switch driver is greater than a reference voltage and a second logical state when the voltage at the output node is less than a reference voltage. The switch driver can be disabled based on the driver enable signal.

7652731, Jan 26, 2010

May 16, 2006

11/435083

Lei Shi - Kent OH, US
Sang Hwa Kim - Kent OH, US

Kent State University - Kent OH

C02F 1/1333
C09K 19/52
C09K 19/38

349 88, 349182, 349185, 349186, 428 11

The present invention provides liquid crystal devices comprised of a composite of an internal polymer network localized on the substrate surfaces and short-pitch dual-frequency switchable cholesteric liquid crystal that operate in two different modes including in-plane switching (amplitude modulation) and out-of-plane switching (phase modulation). The invention further provides a method of making a liquid crystal device demonstrating uniform lying helical axis where the device comprises a composite of an internal spatially ordered polymer network localized by in-situ photo-polymerization at the surface of the substrate. The invention can be used for flat panel displays, as well as spatial light modulators for applications such as optical waveguides, optical beam scanners, computer-generated holograms, and adaptive optics.

8264639, Sep 11, 2012

Nov 4, 2009

12/590181

Lei Shi - Kent OH, US
Sang Hwa Kim - Kent OH, US

Kent State University - Kent OH

G02F 1/1333
C09K 19/052

349 88, 349182, 349187, 428 11

The present invention provides liquid crystal devices comprised of a composite of an internal polymer network localized on the substrate surfaces and short-pitch dual-frequency switchable cholesteric liquid crystal that operate in two different modes including in-plane switching (amplitude modulation) and out-of-plane switching (phase modulation). The invention further provides a method of making a liquid crystal device demonstrating uniform lying helical axis where the device comprises a composite of an internal spatially ordered polymer network localized by in-situ photo-polymerization at the surface of the substrate. The invention can be used for flat panel displays, as well as spatial light modulators for applications such as optical waveguides, optical beam scanners, computer-generated holograms, and adaptive optics.

56964366, Dec 9, 1997

Oct 27, 1995

8/540619

Sang Hoon Kim - Hoffman Estates IL
Andrew V. Schultz - Mt. Prospect IL

Motorola Inc. - Schaumburg IL

H02J 704

320 22

A method and system (400) for controlling battery charging including applying a predetermined voltage to a battery (500) to be charged, increasing the voltage applied to the battery (500) to a known maximum battery charging voltage, measuring a current supplied to the battery (500) at the maximum battery charging voltage, supplying a predetermined set of constant current charging levels, and setting a charging current level equal to one of the set of predetermined constant current charging levels based on the current supplied to the battery at the maximum battery charging voltage for minimizing an amount of time needed to charge the battery (500) and maximizing a useful life of the battery (500).

59201460, Jul 6, 1999

Jun 5, 1997

8/869895

Beverly A. Carroll - Marengo IL
Weiping Zhang - Arlington Heights IL
Sang Kim - Cicero IL

Motorola Inc. - Schaumburg IL

H01L 4108

310365

A piezoelectric resonator (10) with electrodes (14) having a periodic pattern (28) along a portion of an edge (30) of at least one of the electrodes (26). The periodic pattern (28) has a periodicity that destructively interferes with the undesirable vibrational mode. For example, a rectangular AT-cut quartz resonator, which vibrates in a thickness-shear mode may also possess undesirable flexure and face-shear modes. These modes not only present undesirable spurious frequencies, they also change over temperature, disturbing a frequency-temperature response (16) of the quartz crystal. The periodic pattern (28) substantially reduces these undesirable modes, providing a more uniform frequency-temperature response which is beneficial in temperature compensated crystal oscillator applications.

60283734, Feb 22, 2000

Aug 2, 1993

8/100233

Sang Hoon Kim - Hoffman Estates IL
Brian D. Chapman - Gurnee IL

Motorola, Inc. - Schaumburg IL

H02H 324

307 31

A power supply system (300) provides a staged startup of multiple loads (303, 305). Preferably, the power supply (300) is a switching power supply that provides power, in the form of a primary output voltage to a first output terminal (319) and to a second output terminal (325). A first load (303) demands a first startup power from the switching power supply through the first output terminal (319). A voltage comparator (333) provides an enable signal (335) when a primary output signal, present at the first output terminal, exceeds a predetermined threshold (335). A load coupling device, preferably a gateable voltage regulator (331), is coupled to the second output terminal (325). The gateable voltage regulator (331) has an output (327) coupled to a second load (305). The gateable voltage regulator (331), responsive to the enable signal (335), provides a coupling between the second output terminal (325) and the second load (305), whereby the second load (305) demands a second startup power from the power supply through the second output terminal (325).