Samsung Techwin

About: Samsung Techwin is a company organization based out in Seoul, South Korea. It is known for research contribution in the topics: Image processing & Digital image processing. The organization has 965 authors who have published 956 publications receiving 18725 citations.

Roll-to-roll production of 30-inch graphene films for transparent electrodes

Abstract: The outstanding electrical, mechanical and chemical properties of graphene make it attractive for applications in flexible electronics. However, efforts to make transparent conducting films from graphene have been hampered by the lack of efficient methods for the synthesis, transfer and doping of graphene at the scale and quality required for applications. Here, we report the roll-to-roll production and wet-chemical doping of predominantly monolayer 30-inch graphene films grown by chemical vapour deposition onto flexible copper substrates. The films have sheet resistances as low as approximately 125 ohms square(-1) with 97.4% optical transmittance, and exhibit the half-integer quantum Hall effect, indicating their high quality. We further use layer-by-layer stacking to fabricate a doped four-layer film and measure its sheet resistance at values as low as approximately 30 ohms square(-1) at approximately 90% transparency, which is superior to commercial transparent electrodes such as indium tin oxides. Graphene electrodes were incorporated into a fully functional touch-screen panel device capable of withstanding high strain.

High-Performance, Transparent, and Stretchable Electrodes Using Graphene–Metal Nanowire Hybrid Structures

Abstract: Transparent electrodes that can remain electrically conductive and stable under large mechanical deformations are highly desirable for applications in flexible and wearable electronics. This paper describes a comprehensive study of the electrical, optical, and mechanical properties of hybrid nanostructures based on two-dimensional graphene and networks of one-dimensional metal nanowires, and their use as transparent and stretchable electrodes. Low sheet resistance (33 Ω/sq) with high transmittance (94% in visible range), robust stability against electric breakdown and oxidation, and superb flexibility (27% in bending strain) and stretchability (100% in tensile strain) are observed, and these multiple functionalities of the hybrid structures suggest a future promise for next generation electronics. The use of hybrid electrodes to fabricate oxide semiconductor transistors and single-pixel displays integrated on wearable soft contact lenses with in vivo tests are demonstrated.

Apparatus for and method of controlling digital image processing apparatus

Abstract: An apparatus for and method of controlling a digital image processing device in order to reduce power consumption by automatically recognizing a state in which power of a display device can be turned off or the display device can operate in a power saving mode, and in that case, turning off the display device or operating the display device in the power saving mode. The apparatus for controlling a digital image processing device includes: a motion sensing unit sensing a motion of the digital image processing device; and a control unit operating the digital image processing device in a power saving mode when it is determined that the digital image processing device moves.

Implementation of sensorless vector control for super-high-speed PMSM of turbo-compressor

Abstract: This paper describes the implementation of two vector control schemes for a variable-speed 131-kW permanent-magnet synchronous motor drive in super-high-speed applications. The vector control with a synchronous reference frame current regulator was implemented with challenging requirements such as an extremely low stator inductance (28 /spl mu/H), a high DC-link voltage (600 V), and a high excitation frequency (1.2 kHz). Because the conventional position sensor is not reliable at super-high speed, two different schemes were proposed to measure the position of the rotor. As a first step, a vector control with three discrete Hall sensors was proposed. Because the discrete Hall sensors provide rough position information with a resolution of /spl plusmn/30/spl deg/, a position estimation algorithm was proposed to derive the precise position. Subsequently, a vector control scheme without any position sensor was proposed. The proposed sensorless algorithm was implemented by processing the output voltage of the proportional plus integral current regulator. Therefore, the structure is simple and the estimated speed is robust to the measurement noise. An experimental system was built and the proposed control was implemented and evaluated with and without the discrete Hall sensors. The test results, up to a speed of 65000 r/min, confirmed the validity of the proposed control.

System Integration and Power-Flow Management for a Series Hybrid Electric Vehicle Using Supercapacitors and Batteries

Abstract: In this paper, system integration and power-flow management algorithms for a four-wheel-driven series hybrid electric vehicle (HEV) having multiple power sources composed of a diesel-engine-based generator, lead acid battery bank, and supercapacitor bank are presented The super-capacitor is utilized as a short-term energy storage device to meet the dynamic performance of the vehicle, while the battery is utilized as a mid-term energy storage for the electric vehicle (EV) mode operation due to its higher energy density The generator based on an interior permanent magnet machine (IPMM), run by a diesel engine, provides the average power for the normal operation of the vehicle Thanks to the proposed power-flow management algorithm, each of the energy sources is controlled appropriately and also the dynamic performance of the vehicle has been improved The proposed power-flow management algorithm has been experimentally verified with a full-scale prototype vehicle