Gunhee
Gunhee Han, Goyang-Si KR
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20090135041 | Analog-to-digital converter for accumulating reference voltages successively divided by two - An analog-to-digital converter includes a ½ powered signal generator configured to generate divided signals by successively dividing a full scale signal by 2 and output one of the divided signals, an accumulator configured to update a reference signal according to a current divided signal and a current output bit, and a comparator configured to compare the updated reference signal with an input signal and generate a next output bit. | 05-28-2009 |
20090153714 | Method for resetting time-based CMOS image sensor - A method of resetting a time-based CMOS image sensor may be provided, where the time-based CMOS image sensor may include a photodiode, a transfer transistor transferring photo-generated charges generated in the photodiode to a floating diffusion node and having a gate to which a ramp signal is input, and a reset transistor resetting the photodiode and the floating diffusion node. The method may include generating photo-generated charges at the photodiode, transferring the photo-generated charges to the floating diffusion node in response to a ramp signal; and resetting a reset electron potential of the photodiode to be higher than a reset electron potential of the floating diffusion node. | 06-18-2009 |
20100265114 | Analog-to-digital conversion and implementations thereof - In one embodiment, an analog-to-digital converter (ADC) includes a comparator and a supply circuit. The comparator is configured to compare an input signal to a reference signal. The supply circuit is configured to supply the reference signal. The supply circuit is configured to provide different circuit configurations for supplying the reference signal during different stages of analog-to-digital conversion such that the reference signal is scaled in substantially a same manner during at least two of the stages. | 10-21-2010 |
Gunhee Han, Gwangyang-Si KR
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20090295956 | Decimation filters, analog-to-digital converters including the same, and image sensors including the converters - An image sensor includes an analog-to-digital converter (ADC) and a decimation filter. The decimation filter includes a first digital data generator and a second digital data generator. The first digital data generator is configured to integrate sigma-delta modulated M-bit pixel data and output N-bit pixel data based on an integration result. The second digital data generator is configured to integrate the N-bit pixel data, generate P-bit pixel data based on an integration result, and output the P-bit pixel data as decimated data. | 12-03-2009 |
Gunhee Han, Seoul KR
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20090261998 | APPARATUS AND METHOD FOR SIGMA-DELTA ANALOG TO DIGITAL CONVERSION - A method and apparatus are provided for sigma-delta (ΣΔ) analog to digital conversion, the method including receiving an analog signal, sampling the received signal, comparing the sampled signal with a constant reference voltage, providing at least one high-order bit responsive to the constant reference comparison, comparing the sampled signal with a variable reference voltage, providing at least one low-order bit responsive to the variable reference comparison, and combining the at least one high-order bit with the at least one low-order bit; and the apparatus including a comparator, a first ADC portion supplying the comparator with a constant reference voltage for providing at least one high-order bit, and a second ADC portion supplying the comparator with a variable reference voltage for providing at least One low-order bit. | 10-22-2009 |
20090289823 | Sigma-delta analog-to-digital converter and solid-state image pickup device - A sigma-delta analog-to-digital converter may include a sigma-delta modulator and a decimation filter. The sigma-delta modulator may convert a first analog input signal into a first bit stream having a first pattern using sigma-delta modulation and convert a second analog input signal into a second bit stream having a second pattern using the sigma-delta modulation. The decimation filter may integrate the number of bits having a particular value in the first bit stream, output a first digital value, calculate a bitwise complement value of the first digital value, integrate the number of bits having the particular value in the second bit stream with the bitwise complement value of the first digital value as an initial value of a second digital value, and output the second digital value. | 11-26-2009 |
20120229204 | SWITCHED CAPACITOR CIRCUIT - According to the present invention, a switched capacitor circuit comprises: an inverting amplifier for removing the offset by using a chopper stabilization circuit; a sampling unit which is connected between an input terminal and the inverting amplifier; and a feedback unit which is connected to the inverting amplifier in parallel. | 09-13-2012 |
Gunhee Kim, Seoul KR
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20120030129 | HOSPITAL GUIDE SYSTEM AND METHOD FOR PROVIDING HOSPITAL GUIDE SERVICE - Disclosed herein are a hospital guide system for providing guide information to a user in real time through a user terminal in comprehensive consideration of user's position information and user's medical treatment related information and a method for providing a hospital guide service. A hospital guide system includes a user position detecting unit that detects user's position information; a process storing unit that stores user's process information related to a service received by a user in a hospital; a guide information generating unit that decides a user's position-process based situation on the basis of the user's position information and the user's process information and generates guide information suitable for the user's position-process based situation; and a user terminal that provides the guide information to the user. | 02-02-2012 |
Gunhee Kim, Burbank, CA US
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20160093334 | GENERATING STORY GRAPHS WITH LARGE COLLECTIONS OF ONLINE IMAGES - Embodiments presented herein describe techniques for generating a story graph using a collection of digital media, such as images and video. The story graph presents a structure for activities, events, and locales commonly occurring in sets of photographs taken by different individuals across a given location (e.g., a theme park, tourist attraction, convention, etc.). To build a story graph, streams from sets of digital media are generated. Each stream corresponds to media (e.g., images or video) taken in sequence at the location by an individual (or related group of individuals) over a period of time. For each stream, features from each media are extracted relative to the stream. Clusters of media are generated and are connected by directed edges. The connections indicate a path observed to have occurred in the streams from one cluster to another cluster. | 03-31-2016 |
Gunhee Lee, Seoul KR
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20160087234 | ORGANIC SOLAR CELL COMPRISING NANO-BUMP STRUCTURE AND MANUFACTURING METHOD THEREFOR - An organic photovoltaic cell is provided. The organic photovoltaic cell includes a first electrode layer formed on a substrate, metal nanoparticles bound to the surface of the first electrode layer, a hole transport layer formed on the metal nanoparticles to form a nano-bump structure together with the metal nanoparticles, a photoactive layer formed on the hole transport layer, and a second electrode layer formed on the photoactive layer. The nano-bump structure enhances plasmonic effects, leading to an increase in photocurrent. The photoactive layer has an uneven structure. This uneven structure allows the photoactive layer to absorb larger amount of light than an even structure does, leading to an improvement in the photovoltaic efficiency of the organic photovoltaic cell. In addition, the nano-bump structure can be formed by simple dry aerosol deposition without involving a complicated exposure or transfer process, contributing to a marked improvement in economic efficiency. | 03-24-2016 |
Gunhee Lee, Daejeon KR
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20140366142 | APPARATUS AND METHOD FOR ANALYZING VULNERABILITY OF ZIGBEE NETWORK - The present invention relates to an apparatus and method for analyzing vulnerability of a Zigbee network. For this, the apparatus for analyzing vulnerability of a Zigbee network present invention includes an allocation supporting unit for analyzing an environment of a Zigbee network and allocating a plurality of analyzers to multiple channels of the Zigbee network. A public vulnerability inspection unit inspects the Zigbee network for predefined public vulnerability via the plurality of analyzers. A new vulnerability analysis unit analyzes new vulnerability of the Zigbee network via the plurality of analyzers. | 12-11-2014 |