Abstract:
Provided are a lead-free solder, a solder paste, and a semiconductor device, and more particularly, a lead-free solder that includes Cu in a range from about 0.1 wt % to about 0.8 wt %, Pd in a range from about 0.001 wt % to about 0.1 wt %, Al in a range from about 0.001 wt % to about 0.1 wt %, Si in a range from about 0.001 wt % to about 0.1 wt %, and Sn and inevitable impurities as remainder, a solder paste and a semiconductor device including the lead-free solder. The lead-free solder and the solder paste are environment-friendly and have a high high-temperature stability and high reliability.
Abstract:
An optical signal quality monitoring apparatus includes an optical detector for directly receiving an optical signal modulated in an optical path and converting the optical signal to an electric signal, an asynchronous sampling unit for asynchronously sampling the electric signal of the optical detector at a reduced speed, and a digital signal processor for monitoring an optical signal quality by finding a synchronized amplitude histogram of data sampled in the asynchronous sampling unit. An optical signal quality monitoring method includes (a) a step of allowing an optical detector to directly receive a modulated optical signal and to convert the optical signal to an electric signal; (b) a step of allowing an asynchronous sampling unit to asynchronously sample the electric signal; and (c) a step of allowing a digital signal processor to monitor an optical signal quality by generating a synchronized amplitude histogram of sampled data.
Abstract:
Provided is a method of manufacturing a hexagonal boron nitride nanosheet to mass-produce a high-quality hexagonal boron nitride nanosheet at a low temperature in a safe process.The method of manufacturing a hexagonal boron nitride nanosheet includes (a) obtaining an alkali metal ion or alkali earth metal ion from a salt mixture including at least two kinds of alkali metal salt or alkali earth metal salt, (b) preparing a hexagonal boron nitride interlayer compound by inserting the alkali metal ion or alkali earth metal ion into layers of hexagonal boron nitride, and (c) obtaining a hexagonal boron nitride nanosheet by removing the alkali metal ion or alkali earth metal ion from the hexagonal boron nitride interlayer compound.
Abstract:
A steering apparatus of an in-wheel motor-driven electric vehicle capable of steering the vehicle by controlling torques applied to in-wheel motors mounted in road wheels. The steering apparatus of an in-wheel motor-driven vehicle includes a rigid tie rod having both ends rotatably connected to the in-wheel motors of the left and right wheels through hinge pins; a steering information detecting sensor for detecting a steering operation angle and torque according to user's steering operation; and a controller for calculating torque outputs to be applied to the in-wheel motor of the left wheel and the in-wheel motor of the right wheel based on information on the steering operation angle and torque detected by the steering information detecting sensor and vehicle speed information and controlling operation of the in-wheel motor of the left wheel and the in-wheel motor of the right wheel.
Abstract:
A power supply device may include a switching unit receiving and switching direct current power to provide power, a converting unit converting primary power into secondary power having a voltage level depending on a preset turns ratio according to the switching of the switching unit and outputting the converted secondary power, a light emitting diode which is driven by the secondary power provided from the converting unit, and a controlling unit generating a control signal of the switching unit based on voltage information of the secondary power and current information from the light emitting diode.
Abstract:
A system and method for providing a distributed virtual cloud by using a mobile grid are disclosed. The system for providing a distributed virtual cloud according to an exemplary embodiment of the present invention may include a social topology creating unit creating a social topology based upon social relationships between user equipments configuring a Social Network Service (SNS), a cluster configuration unit configuring a social topology cluster based upon closeness centrality between the user equipments configuring the Social Network Service (SNS), and a cloud interoperation unit performing interoperation between a virtual cloud corresponding to each social topology cluster and a cloud managing the social topology.
Abstract:
A data signal receiver includes a clock signal filter, a falling pulse signal generator, a mixing block, and a sampler. The clock signal filter generates a first filtered clock signal and a second filtered clock signal by filtering a clock signal. The falling pulse signal generator generates a falling pulse signal based on the first filtered clock signal. The mixing block generates a mixed data signal by mixing a data signal and the falling pulse signal. The sampler generates a recovered data signal by sampling the mixed data signal in response to the second filtered clock signal.
Abstract:
A surface shape measuring device includes a substrate, an electrode portion including at least one electrode pattern, the electrode pattern extending on the substrate, a coating layer on the substrate to cover the electrode pattern, and a detector electrically connected to the electrode pattern and detecting a change in a physical quantity of the electrode pattern generated by the deformation of the substrate or the coating layer by an external load applied thereto.
Abstract:
Disclosed is a device for bonding a flexible PCB (Printed Circuit Board) to a camera module, the device according to an exemplary embodiment of the present disclosure comprising a thermo-compression unit configured to bond the camera module to the flexible PCB using an conductive film by applying heat and pressure to the conductive film between the camera module and the flexible PCB, an ultrasonic wave bonding unit configured to directly transmit ultrasonic wave vibration energy to the camera module to remove an oxide film on connection particles intrinsically formed inside the conducive film, and a controller configured to activate the ultrasonic wave bonding unit when a temperature of the conductive film rises to a predetermined temperature.