Abstract: This disclosure relates to exact sun-tracking devices by the principle of exact sun-following by independent 2-DOF, which says if the daily rotation axis is installed on a ground structure in parallel with the earth's rotation axis and the elevation angle axis is mounted perpendicularly to the daily rotation axis then the two rotational degrees of freedom are independent of each other. This property makes a separate intermittent control with a forward half-step setting very efficient and energy-saving. A control system by a wire loop driving mechanism has several advantages, holding the structure securely, relieving a motor weight from the over-structure, and allowing a simple economic control with self-locking. Three structural types are categorized: a long shaft type, a tip-tilt type, and a tension structure type. An array sun-tracking device with an efficient wire loop actuating mechanism illustrates a preferred sun power generation system for general and industrial applications.

Abstract: Provided is a community management method including: receiving, from a first terminal, a generation request for a standby community; generating the standby community including a user of the first terminal as a participant, according to the generation request for the standby community; and generating a regular community including participants of the standby community as members in response to a number of the participants of the standby community reaching a target number of the standby community, wherein a writing function is restricted in the standby community and allowed in the regular community.

Abstract: A method of testing semiconductor packages, which performs an electrical test on the semiconductor packages after receiving the semiconductor packages into insert pockets of a test tray and connecting with sockets of a tester by using pusher units each including a heater, includes receiving temperature information of the semiconductor packages from the tester while testing the semiconductor packages, calculating an overall average temperature of the semiconductor packages from the received temperature information, and individually controlling operations of heaters of the pusher units based on difference values between the overall average temperature and individual temperatures of the semiconductor packages.

Abstract: A method of testing semiconductor packages, which performs an electrical test on the semiconductor packages after receiving the semiconductor packages into insert pockets of a test tray and connecting with sockets of a tester by using pusher units each including a heater, includes receiving temperature information of the semiconductor packages from the tester while testing the semiconductor packages, calculating an overall average temperature of the semiconductor packages from the received temperature information, and individually controlling operations of heaters of the pusher units based on difference values between the overall average temperature and individual temperatures of the semiconductor packages.

Abstract: Most vibration generators that use rotating eccentric masses of prior arts have disadvantages in controlling vibration magnitude such as stopping equipment, adjusting intermittently, or limitation on control range. In the present invention to continuously change the direction of a generated vibration force or its magnitude, the principle of synthesizing simple harmonic motions by phase shifting is used and two methods, called a mechanical phase shifting and a motor speed controlled phase shifting, are provided. A mechanical phase shifting device includes an angle adjusting plate to change the phases of two eccentric mass rotators and two pairs of gears and links for a reverse rotation of eccentric masses. A motor speed controlled phase shifting is enabled by acceleration and deceleration of a motor. A moment generator comprises two sets of eccentric mass vibrators connected by extending shafts between them and can be used for industry shakers, stabilizer's for floating bodies, and so on.

Abstract: A crane for loading and unloading a cargo includes multi-stage trolley. The multi-stage trolley for a crane includes a first trolley movable in a longitudinal direction along a boom of the crane; a second trolley movable in a lateral direction on the first trolley; a hoisting wire provided in the longitudinal direction along the boom; a spreader connected to the hoisting wire through the first trolley and the second trolley and supported by the hoisting wire, the spreader being movable in a vertical direction according to a movement of the hoisting wire. The multi-stage trolley further includes a sheave block unit for changing a direction of the hoisting wire to maintain a vertical level of the spreader constant when the first trolley and/or the second trolley is moved.

Abstract: A balance maintaining equipment for a floating body includes a driving device for rotating a driving shaft; a first eccentric rotating body positioned at one side of the driving device and connected to the driving shaft to rotate around the driving shaft by the rotation thereof; and a second eccentric rotating body positioned at the other side of the driving device and connected to the driving shaft to rotate around the driving shaft by the rotation thereof, while having a phase difference of 180 degrees from the rotation of the first eccentric rotating body. The balance maintaining equipment generates the moment in the opposite direction to the roll of the floating body. Furthermore, when the roll period of the floating body is changed, the balance maintaining equipment varies the angular velocity of the driving shaft to interwork with the roll period of the floating body.

Abstract: A crane for loading and unloading a cargo includes a trolley assembly. The trolley assembly includes a first trolley movable in a longitudinal direction along a boom of the crane; a second trolley movable in a lateral direction on the first trolley; a hoist provided on the second trolley; a spreader movable in a vertical direction by the hoist; a light emitting unit provided on the spreader; and a smart camera for capturing an image of the light emitting unit to measure a movement of the spreader. A movement of the hoist is controlled by a location control unit based on the measured movement of the spreader.

Abstract: A crane for loading and unloading a cargo includes multi-stage trolley. The multi-stage trolley for a crane includes a first trolley movable in a longitudinal direction along a boom of the crane; a second trolley movable in a lateral direction on the first trolley; a hoisting wire provided in the longitudinal direction along the boom; spreader connected to the hoisting wire through the first trolley and the second trolley and supported by the hoisting wire, the spreader being movable in a vertical direction according to a movement of the hoisting wire. The multi-stage trolley further includes a sheave block unit for changing a direction of the hoisting wire to maintain a vertical level of the spreader constant when the first trolley and/or the second trolley is moved.

Abstract: A balance maintaining equipment for a floating body includes a driving device for rotating a driving shaft; a first eccentric rotating body positioned at one side of the driving device and connected to the driving shaft to rotate around the driving shaft by the rotation thereof; and a second eccentric rotating body positioned at the other side of the driving device and connected to the driving shaft to rotate around the driving shaft by the rotation thereof, while having a phase difference of 180 degrees from the rotation of the first eccentric rotating body. The balance maintaining equipment generates the moment in the opposite direction to the roll of the floating body. Furthermore, when the roll period of the floating body is changed, the balance maintaining equipment varies the angular velocity of the driving shaft to interwork with the roll period of the floating body.

Abstract: A crane spreader for use in lifting a container includes an attachment unit, a head block, a frame unit, a position adjustment unit and a fixation unit. The attachment unit detachably attaches the crane spreader to an upper surface of the container. The head block has a pulley connected to a trolley of a crane through a cable and coupled to the attachment unit to restrict a horizontal movement the attachment unit with respect to the head block. The frame unit is supported by the head block to be horizontally movable with respect to the head block, the frame unit being disposed below the head block with a gap therebetween. The position adjustment unit aligns the frame unit with the container by displacing the frame unit with respect to the attachment unit. The fixation unit engages the container with the frame unit.

Abstract: A silicon single crystal ingot growing apparatus for growing a silicon single crystal ingot based on a Czochralski method The silicon single crystal ingot growing apparatus includes a chamber; a crucible provided in the chamber, and for containing a silicon melt; a heater provided at the outside of the crucible and for heating the silicon melt; a pulling unit for ascending a silicon single crystal grown from the silicon melt; and a plurality of magnetic members provided at the outside of the chamber and for asymmetrically applying a magnetic field to the silicon melt Such a structure can uniformly controls an oxygen concentration at a rear portion of a silicon single crystal ingot using asymmetric upper/lower magnetic fields without replacing a hot zone In addition, such a structure can controls a flower phenomenon generated on the growth of the single crystal by the asymmetric magnetic fields without a loss such as the additional hot zone (H/Z) replacement, P/S down, and SR variance.

Abstract: Disclosed herein are a novel sucrose-inducible promoter sequence and a 5? untranslated region which are derived from sweetpotato ADP-glucose pyrophosphorlyase gene (ibAGPl) (SEQ ID NO: 1). Also disclosed are expression vectors using the same sequences and a transgenic plant using the same vectors. The promoter and 5? untranslated region according to the present invention can confer a high level of sucrose-inducible expression in plants, particularly in plant storage roots which contain sucrose in relatively large quantities to accumulate starch in large quantities in plants. Therefore the present invention may be useful for the generation of transgenic plants to produce useful proteins in large quantities in plant storage roots.

Abstract: The present invention relates to a promoter directing high levels of expression of a gene in plant storage roots, derived from the sweet potato MADS-box gene, a vector directing high levels of expression of a gene in plant storage roots comprising the same and a transient assay method expressing a foreign gene transiently in plant storage roots using the same vector. The promoter according to the present invention can induce high levels of expression particularly in plant storage roots. Therefore the present invention is very useful for the development of transgenic plants to produce valuable materials in large quantities in plant storage roots.

Abstract: The present invention improves upon the Czochralski method for growing a single-crystal silicon ingot and provides a high quality silicon wafer having an oxide layer with superior voltage-resistance characteristics. An apparatus and method are also provided, whereby vacancy defect density and distribution are uniformly controlled. A single-crystal silicon ingot is grown under a condition where the temperature variation of the ingot is less than or equal to 20° C./cm in the temperature range of 1000 to 1100° C.

Abstract: A symmetrical proof-mass accelerometer with a self-diagnosis capability and its fabrication method are disclosed. The accelerometer has symmetrical mass distribution with respect to the plane of the cantilever beam with an offset between upper and lower masses, so as to minimize cross-axis sensitivity and facilitate self-diagnostic resistor installation. This accelerometer can be applied to automobile electronics systems, consumer electronics, and industrial electrical measurement systems, in which the measurements of displacement, velocity, vibration, acceleration, angular acceleration and their changes are required.

Abstract: A symmetrical proof-mass accelerometer with a self-diagnosis capability and its fabrication method are disclosed. The accelerometer has symmetrical mass distribution with respect to the plane of the cantilever beam with an offset between upper and lower masses, so as to minimize cross-axis sensitivity and facilitate self-diagnostic resistor installation. This accelerometer can be applied to automobile electronics systems, consumer electronics, and industrial electrical measurement systems, which require measurements of displacement, velocity, vibration, acceleration, angular acceleration and their changes.