Abstract:
A semiconductor light emitting device and a fabrication method thereof are provided. The semiconductor light emitting device includes: first and second conductivity-type semiconductor layers; and an active layer disposed between the first and second conductivity-type semiconductor layers and having a structure in which a quantum barrier layer and a quantum well layer are alternately disposed, and the quantum barrier layer includes first and second regions disposed in order of proximity to the first conductivity-type semiconductor layer.
Abstract:
The present invention provides an apparatus and method for determining deterioration of a fuel cell, the method including measuring in real time fluoride ion concentration or pH value of outflow water from a fuel cell stack during operation in a fuel cell vehicle, calculating a fluoride emission rate from the measured value and, if the calculated fluoride emission rate is out of a predetermined normal range, determining deterioration of an electrolyte membrane of the fuel cell stack.
Abstract:
A test system and a failure parsing method. The test system may comprise a cell array including defective cells formed according to various failure causes, a test apparatus configured to measure electric characteristics from the defective cells and make the measured electric characteristics numerical, and a database apparatus configured to store the numerical electric characteristics. The failure parsing method may include forming defective cells to have at least one failure cause, measuring electric characteristics of each of the defective cells, storing the measured electric characteristics of each of the defective cells in a database, and judging failure causes of a failed chip of a semiconductor wafer based on the database.
Abstract:
The present invention relates to a method for synthesizing highly dispersed supported platinum catalyst. More particularly, the present invention relates to a method of synthesizing highly dispersed supported platinum catalyst comprising: dissolving a reducing agent in a solvent to produce a solution, dissolving a platinum chloride to the same solvent; adding a carbon support and platinum in a predetermined ratio to the above mixed solution, agitating the mixture, performing ultrasonic treatment, and performing heat treatment; and adding a HCl solution, agitating the mixture, separating the precipitates via filtration to produce a catalyst, and then washing the catalyst with distilled water, thereby obtaining an active highly dispersed supported platinum catalyst which has excellent electric charge activity, uniformly-sized platinum particles and relatively high specific surface area.
Abstract:
An apparatus and method for controlling an audio/video (AV) device. A first AV device is adapted to receive a remote control signal, selectively modulate the received remote control signal, and transfer the modulated remote control signal along with an audio signal over an audio line. A second AV device is adapted to receive the modulated remote control signal transferred along with the audio signal over the audio line, separate the received remote control signal from the received audio signal, demodulate the separated remote control signal, and perform an operation corresponding to the demodulated remote control signal. Therefore, it is possible to normally control an AV device even though a user involuntarily operates a remote controller of the AV device toward the screen of a TV under the condition that the AV device is placed far from the TV or the angle defined by the TV, user and AV device is large.
Abstract:
The present invention provides an apparatus for effectively preventing carbon corrosion from occurring at the cathode of a fuel cell. The present apparatuses include an air blower supplying air from an air supply source to a fuel cell; a fuel cell receiving air from the air blower to generate electricity by a chemical reaction; an air discharge pipe through which residual air remaining after oxygen of the air is consumed for chemical reaction in the fuel cell is discharged; a pressure sensor provided in the air discharge pipe for detecting air pressure in the fuel cell; an air discharge solenoid valve provided in the air discharge pipe for controlling air flow of the air discharge pipe; and a controller controlling operation of the air blower and the air discharge solenoid valve by receiving a signal detected by the pressure sensor wherein the controller detects the air pressure through the pressure sensor to allow the air blower to supply air to the fuel cell until the air pressure reaches a predetermined pressure and then closes the air discharge solenoid valve until the oxygen in the fuel cell is completely exhausted, thereby preventing the formation of hydrogen/oxygen interface at the anode of the fuel cell.
Abstract:
Provided is a quaternary Pb-free solder composition incorporating Sn—Ag—Cu—In, which can prevent a cost increase and sufficiently ensure proccessability and mechanical property as a solder material. To this end, indium (In) with appropriate amount is added into the Pb-free solder composition, and the addition amount of Ag is optimized, thus preventing a decrease in wettability caused by a decrease in the amount of Ag and improving resistance to a thermal cycling and a mechanical impact. The quaternary Pb-free solder composition includes silver (Ag) of about 0.3 wt. % or more, and less than about 2.5 wt. %, copper (Cu) of about 0.2 wt. % or more, and less than about 2.0 wt. %, indium (In) of about 0.2 wt. % or more, and less than about 1.0 wt. % or less, and a balance of tin (Sn).
Abstract:
There are provided a test pattern of a semiconductor device and a test method using the same. The test pattern of the semiconductor device includes a conductive pattern disposed on a semiconductor substrate, and the conductive pattern includes a plurality of line regions, which are aligned in parallel, and spaced at a uniform interval, and a plurality of connecting regions for connecting the plurality of line regions in a zigzag shape. The test pattern includes a plurality of transistors electrically switching first ends of the adjacent line regions corresponding to the connecting region, and each transistor includes a source region, which is electrically connected to one end of one of the adjacent line regions, and a drain region, which is electrically connected to one end of the other one of the adjacent line regions. Further, a transistor selecting part is electrically connected to gates of the plurality of transistors, for selecting one of the plurality of transistors or a combination thereof.
Abstract:
A method of setting a password and a method of authenticating a password in a portable device having a small number of operation buttons. The method of setting a password includes: determining whether there is an input through the operating of an operation button within a predetermined time; displaying a symbol of the operated operation button, when there is an input through the operating of an operation button within the predetermined time; and setting displayed symbols as a password required for using the portable device, when there is an input through the operating of an operation button for representing an end of an input of symbols. Accordingly, the password can be set by operating operation buttons in the portable device having no text or number buttons. Authentication of a password can be performed by using the set password.
Abstract:
A defect analysis method includes storing, in a database, data indicative of defects and analog characteristics of corresponding defective bits in a database. A first defective area in a first wafer is found, and analog characteristics of defective bits in the first defective area are measured. The measured analog characteristics and the analog characteristics stored in the database are compared to locate a defect causing the first defective area.