摘要:
A refrigerator having a valve to distribute a refrigerant to a plurality of storage compartments. The valve includes a step motor, a valve plate having at least one inlet and a plurality of outlets, and an opening/closing member rotatably coupled to the valve plate to open or close the plurality of outlets in accordance with a rotating motion thereof. In particular, the opening/closing member has one or more recesses, which are indented from the circumference of the opening/closing member by a predetermined distance, to always open only one of the plurality of outlets. With the above-described configuration, the refrigerator can reduce material costs, and can achieve not only simplified valve control, but also accurate control in temperatures of the plurality of storage compartments.
摘要:
Provided is a micro-column electron beam apparatus including: a base; an electron lens bracket on which an electron lens modulate can be fixed, mounted in a central portion of the base; an electron beam source tip module vertically disposed on the electron lens module; a pan spring plate stage module that is mounted over the base, supports the electron beam source tip module at a central portion thereof, and includes a three-coupling pan spring plate portion including first through third spring units that are coupled to the electron beam source tip module in three directions on a plane perpendicular to the vertical axis, which vertically passes the center of the electron beam source tip module, to elastically support the electron beam source tip module in three directions; a first piezoelectric actuator coupled to the pan spring plate stage module to move the electron beam source tip module along a first axis perpendicular to the vertical axis; and a second piezoelectric actuator coupled to the pan spring plate stage module to move the electron beam source tip module along a second axis perpendicular to the vertical axis and the first axis.
摘要:
A micro column electron beam apparatus having a reduced number of interconnections is provided. The micro column electron beam apparatus includes: a low temperature co-fired ceramic (LTCC) substrate; a plurality of deflector electrodes attached to a predetermined top portion of the LTCC substrate; a pad electrode placed at a top edge of the LTCC substrate and transmitting an external signal to the deflector electrodes; and a connection unit placed in the LTCC substrate and electrically connecting the deflector electrode and the pad electrode.
摘要:
Provided is a micro stage comprising: a body having a vertically perforated through-hole passing through a central portion thereof; a bobbin including a tip portion with an electron emission tip embedded in the center thereof, and passing through the through-hole of the body to be moved in the through-hole along a first axis perpendicular to a vertical direction; a first piezoelectric element disposed on the body and lengthened when a voltage is applied thereto to push the bobbin in one direction along the first axis; a second piezoelectric element disposed on the body and lengthened when a voltage is applied thereto to push the bobbin in the other direction along the first axis; and an upper cover that is coupled to an upper portion of the body and has a through-hole, through which the bobbin passes and communicates with the through-hole of the body, wherein the bobbin can be positioned as desired along the first axis by adjusting the voltages applied to the first piezoelectric element and the second piezoelectric element. Accordingly, the emission tip can be exactly and stably positioned using only the movable piezoelectric elements.
摘要:
Provided is a wafer-scale microcolumn array using a low temperature co-fired ceramic (LTCC) substrate. The microcolumn array includes a LTCC substrate having wirings and wafer-scale beam deflector arrays, which are attached to at least one side of the LTCC substrate and has an array of deflection devices deflecting electron beams. The wafer-scale microcolumn array using the LTCC substrate makes it possible to significantly increase the throughput of semiconductor wafers, simplify its manufacturing process, and lower its production cost.
摘要:
A tripod type constant velocity joint comprises a housing having three track grooves which are defined at trisected positions of the housing along a circumferential direction and extend in a radial direction; a spider having three polyhedral trunnions which are projectedly formed at trisected positions of the spider along the circumferential direction to be respectively inserted into the track grooves and each of which has at least two polygonal surfaces; inner rollers a circumferential inner surface of each of which has a curved contour for surrounding the polyhedral trunnion; a plurality of needle rollers assembled to a circumferential outer surface of each inner roller; and outer rollers each formed to be rotated through the needle rollers, to be moved in an axial direction of the inner roller, and to be moved in an axial direction of the track groove along a guide surface of the housing.
摘要:
Embodiments of methods and systems of the application can transmit data (e.g., voice) using a wireless LAN and a Bluetooth. One system embodiment can include a terminal device, an AP (access point) for communicating with the terminal device according to a first (e.g., wireless LAN) protocol by using a first frequency band among multiple frequency bands of a prescribed frequency band (e.g., ISM frequency band) and a headset for communicating with the terminal device according to a second (e.g., Bluetooth) protocol by using at least one frequency band of remaining frequency bands by excepting the first frequency band.
摘要:
A Chip on Board (COB) package which can reduce the manufacturing costs by using a general PCB as a substrate, increase a heat radiation effect from a light source, thereby realizing a high quality light source at low costs, and a manufacturing method thereof. The COB package includes a board-like substrate with a circuit printed on a surface thereof, the substrate having a through hole. The package also includes a light source positioned in the through hole and including a submount and a dome structure made of resin, covering and fixing the light source to the substrate. The invention allows a good heat radiation effect by using the general PCB as the substrate, enabling manufacture of a high quality COB package at low costs. This in turn improves emission efficiency of the light source, ultimately realizing a high quality light source.
摘要:
An apparatus and method for searching for a protein active site by using a bottom-hat transformation are provided. First, an image of protein surface is generated and then a volumetric image is generated by sampling the protein surface in units of a predetermined length. Thereafter a morphology process is performed on the volumetric image, thereby extracting the protein active site from the morphology-processed volumetric image. Accordingly, it is possible to rapidly search for a protein active site in a 3D structural space.
摘要:
The method of storing nitrogen trifluoride includes storing nitrogen trifluoride in a chromium-molybdenum steel vessel manufactured through a deep drawing ironing process. Nitrogen trifluoride stored in this way according to the method of this invention does not deteriorate even after two years or more have passed.