Abstract: A leakage detection system includes: a gas supply line along which boil-off gas is supplied to a compressor; a reliquefaction line along which the compressed boil-off gas is cooled and reliquefied through a heat exchanger and is returned to a storage tank; a refrigerant circulation line along which a refrigerant is circulated; a refrigerant compressor to compress the refrigerant discharged from the heat exchanger; a refrigerant expander expanding and cooling the compressed refrigerant compressed by the refrigerant compressor and having been cooled through the heat exchanger and supplying the cooled refrigerant back to the heat exchanger; and a refrigerant charge line connecting an inventory tank filled with nitrogen to an upstream side of the refrigerant compressor. Upon initial start-up or restart of a reliquefaction process, the nitrogen is supplied to the upstream side of the refrigerant compressor via the refrigerant charge line to detect leaks in the refrigerant circulation line.

Abstract: Disclosed herein is a micro-leak detection system of a reliquefaction system for ships. The micro-leak detection system includes: a reliquefaction system reliquefying boil-off gas generated from a liquefied gas stored in a storage tank in a ship by recovering cold heat from the boil-off gas in a heat exchanger, compressing the boil-off gas, and cooling the compressed boil-gas in the heat exchanger through heat exchange with refrigerant circulated along a refrigerant circulation line; a heater heating the boil-off gas to be supplied from the storage tank to the heat exchanger through heat exchange with an antifreeze liquid; and a micro-leak detection device connected to a drain port through which a remaining liquid is drained from the heater and detecting small leaks in the heater.

Abstract: A method of providing content includes providing preview content for specific content in a preset preview area corresponding to at least a portion of a display area, changing, based on receiving a scroll request for the preview area, an output range of the preview content output in the preview area, and providing, based on the output range of the preview content corresponding to a preset range, a graphic object related to viewing the specific content in the preview area.

Abstract: Provided are optical absorbent compounds and their uses. The compounds have excellent heat resistance and can stably maintain light absorption characteristics even under high temperature conditions or high temperature and high humidity conditions. A resin film secures desired optical properties by applying the compounds. The compounds can be used as an optical absorbent for an optical filter.

Abstract: An artificial intelligence-based injection molding system in which molding conditions can be changed to manufacture fair-quality products when defective products are manufactured because of disturbances during the injection molding including an injection molding machine which performs injection molding by injecting a molding material into a mold; an injection state data acquisition unit for acquiring, during injection molding, current injection state data that includes the viscosity profile of the molding material injected into the mold and/or the injection pressure value thereof; a determination unit, which inputs the current injection state data into a molding quality maintenance model trained with predetermined target injection state data, so as to determine whether to maintain molding quality; and a molding condition setting unit for changing a preset molding condition so that the current injection state data follows the target injection state data, when the determination unit determines not to maintain t

Abstract: A boil-off gas treatment system includes: a first compressor receiving boil-off gas generated from liquefied gas stored in a storage tank of a ship and compressing the boil-off gas; a second compressor compressing boil-off gas received from the storage tank; a heat exchanger cooling the boil-off gas compressed by the first compressor or the second compressor; and a refrigerant circulation line for circulating a refrigerant to the heat exchanger. The first compressor is a multistage compressor including a plurality of compressors and compressing the boil-off gas to a fuel supply pressure required for a propulsion engine. The second compressor compresses the boil-off gas to a fuel supply pressure required for a power generation engine which is lower than the propulsion engine. The boil-off gas compressed by part of the first compressor is supplied to the heat exchanger to be cooled or is supplied to the power generation engine.

Abstract: An air purifier. A dry filter section includes a filter member, a dust sensor, and a UV lamp to primarily collect ultrafine dust particles. A suction pump is disposed to forcibly supply the intaken air with the dust particles removed. First and second wet purification sections are filled with water to secondarily purify the intaken air and purified air. A control section controls the operation of the suction pump and respective valves connecting the dry filter section, and the first and second wet purification sections. First and second bubble removers are rotatably provided in the first and second wet purification sections, respectively, to remove air-bubbles injected into the first and second wet purification sections, under the control of the control section.

Abstract: The present invention relates to a method of manufacturing a photonic integrated device based on single-step active layer epitaxial growth, and the method includes forming, on a substrate, a reference region having a first bandgap and a region having a bandgap, which is red-shifted relative to the first bandgap, through active layer epitaxial growth, and applying a blue-shift to the substrate to form a region having a second bandgap that is blue-shifted relative to the first bandgap.

Abstract: A method and system for generating a target map for training a neural network and obtaining a sound source map regardless of the maximum number of sound sources, having a short computation time for inference, high spatial resolution and high sound source accuracy. The method includes generating grids each having a spacing within a given range at positions where sound sources are present in order to form a sound source map, calculating a result value for each of coordinates of the grids so that the result value is a local maximum at the position of a sound source and the result value decreases depending on the distance from the sound source, arranging the result values at positions on matrices corresponding to the respective coordinates of the grids, and generating a target map having an image form by using the result values arranged in on the matrices.

Abstract: An artificial intelligence-based injection molding system comprising a standard data extraction unit for extracting target standard data of a product produced by a mold from mold information about the mold to which a molding material is supplied; a molding condition output unit inputting the extracted target standard data into a pre-learned molding condition generation model to output a molding condition; an injection molding device, supplying the molding material to the mold according to the molding condition to produce the product; and a determination unit, comparing production standard data of the produced product and the target standard data to determine whether the molding condition is appropriate, wherein, if the determination unit determines that the molding condition is inappropriate, the molding condition output unit generates the production standard data and the molding condition as one set of feedback data, and trains the molding condition generation model with the set of feedback data.

Abstract: Disclosed are a system and method for reliquefaction of boil-off gas of a ship and a system and method for treating off-gas of a reliquefaction apparatus. The boil-off gas reliquefaction system includes: a compressor compressing boil-off gas generated from liquefied gas stored in an on-board storage tank; a heat exchanger cooling the boil-off gas compressed in the compressor; a refrigerant circulation line in which a refrigerant supplied to the heat exchanger circulates; a temperature raising line extending from the storage tank to the compressor; and a heater provided to the temperature raising line, wherein the heater heats the boil-off gas to a suitable input temperature of the compressor.

Abstract: A refrigerant charging system includes: a reliquefaction system reliquefying boil-off gas generated in a liquefied gas storage tank by compressing the boil-off gas and subjecting the compressed boil-off gas to heat exchange with refrigerant supplied to a heat exchanger while circulating along a refrigerant circulation line; a buffer tank storing utility N2 to be supplied to the ship; a booster compressor receiving the utility N2 from the buffer tank, compressing the received N2, and supplying the compressed N2 to the refrigerant circulation line; and a first load-up line along which the N2 is supplied from the buffer tank to the refrigerant circulation line without passing through the booster compressor. Upon initial charging in a non-operation state of the reliquefaction system, the refrigerant circulation line is charged with refrigerant by supplying the N2 from by a pressure differential between the refrigerant circulation line and the buffer tank.

Abstract: Disclosed herein are a fuel supply system for ships and a fuel supply method using the same. The fuel supply method includes: 1) supplying an excess amount of liquefied gas as fuel to an incompressible fluid-fueled engine (E); 2) cooling unconsumed fuel discharged from the engine (E) through heat exchange with liquefied gas discharged from a storage tank (T); 3) returning the unconsumed fuel discharged from the engine (E) and having been cooled through heat exchange in step 2) to the storage tank (T); and 4) supplying the liquefied gas discharged from the storage tank (T) and having been used as refrigerant for heat exchange in step 2) to the engine (E). The fuel supply method can prevent cavitation in the engine (E) by supplying the excess amount of liquefied gas sufficient to accommodate variation in load of the engine (E) as fuel to the engine (E).

Abstract: The present invention relates to a benzamide derivative, a method for preparing same, and a pharmaceutical composition for the prevention or treatment of cancer, containing same as an active ingredient. The benzamide derivative according to an aspect of the present invention can be used in the prevention or treatment of cancer by suppressing EGFR mutation, and, when administered in combination with an EGFR antagonist such as cetuximab, exhibits a significantly synergistic effect on anticancer activity, and thus can be effectively used as an anticancer agent.

Abstract: The present disclosure relates to a perovskite light-emitting composition, and a method for preparing the same. The method for producing the perovskite light-emitting composition of the present disclosure includes an organic siloxane solvent having very high hydrophobicity and low surface tension as a synthesis solvent, thereby having a large surface tension difference from the perovskite light-emitting particles containing an organic ligand. Through these properties, a dense organic ligand can be attached to the surface of the perovskite nanoparticles, and perovskite light-emitting particles having a high ligand density can be prepared. Accordingly, the perovskite light-emitting particles prepared by the method of the present disclosure have improved dispersion stability, light-emitting properties and long-term storage stability.

Abstract: A ship comprises: a liquefied gas storage tank; a multi-stage compressor for compressing a boil-off gas discharged from a storage tank and comprising a plurality of compression cylinders; a second heat exchanger for heat exchanging a fluid, which has been compressed by the multi-stage compressor, and thus cooling same; a first decompressing device for expanding a flow (“flow a1”) partially branched from the flow (“flow a”) that has been cooled by the second heat exchanger; a third heat exchanger for heat exchanging, by “flow a1” which has been expanded by the first decompressing device as a refrigerant, the remaining flow (“flow a2”) of “flow a” after excluding “flow a1” that has been branched and thus cooling same; and a second decompressing device for expanding “flow a2” which has been cooled by the third heat exchanger.

Abstract: Disclosed is a re-liquefying device using a boil-off gas as a cooling fluid so as to reliquefy the boil-off gas generated from a liquefied gas storage tank provided in a ship. A boil-off gas re-liquefying device for a ship comprises: a multi-stage compression unit for compressing boil-off gas generated from a liquefied gas storage tank; a heat exchanger in which the boil-off gas generated from the storage tank and the boil-off gas compressed exchange heat; a vaporizer for heat exchanging the boil-off gas cooled by the heat exchanger and a separate liquefied gas supplied to a fuel demand source of a ship, and thus cooling the boil-off gas; an intermediate cooler for cooling the boil-off gas that has been cooled by the heat exchanger; and an expansion means for branching a part of the boil-off gas, which is supplied to the intermediate cooler, and expanding the same.

Abstract: A refrigerant cycle pressure control system includes: a heat exchanger cooling boil-off gas received from a storage tank; a refrigerant cycle including a refrigerant circulation line, a refrigerant compressor, and an expander; an inventory tank storing the refrigerant to be charged to the refrigerant cycle; a refrigerant supply line connecting the inventory tank to an upstream side of the refrigerant compressor to replenish the refrigerant cycle with the refrigerant; a refrigerant discharge line connecting a downstream side of the refrigerant compressor to the inventory tank to discharge the refrigerant from the refrigerant cycle to the inventory tank; and a pressure regulation line branched off of the refrigerant discharge line. The refrigerant cycle is depressurized by discharging the refrigerant from the refrigerant cycle through the refrigerant discharge line or the pressure regulation line.

Abstract: A comparator circuit has a pre-charging and early reset output stage. The comparator circuit includes: a first pre-charging transistor and a second pre-charging transistor. A gate of the first pre-charging transistor is connected to a pre-charging signal, and a gate of the second pre-charging transistor is connected to a main clock signal, wherein the pre-charging signal is enabled earlier than the main clock signal. At a pre-charging phase, there is a small electric current, and a comparator slowly amplifies an input small signal to reduce noise; and the electric current is increased after a certain time delay, such that on the basis of pre-charging, the comparator rapidly completes a pre-amplification phase and then enters a regeneration phase.

Abstract: The present invention discloses a circuit for improving linearity and channel compensation of PAM4 receiver analog front end, comprising a first stage and a second stage, the first stage comprising first to twentieth transistors, a first resistor, a pair of second resistors, a pair of first capacitors, and a pair of second capacitors. In the first stage circuit, the ninth and tenth transistors are directly coupled to the ground, eliminating the electrical connection to the bias current source. The Input terminals of the ninth and tenth transistors are coupled to the output signals of the preceding nineteenth and twentieth transistors, so that the ninth and tenth transistors serve as both input pairs and current source transistors. The overall current is limited by the thirteenth and fourteenth transistors, which results in a lower power supply voltage for the first stage consisting of the ninth through fourteenth transistors.