Abstract: An optical imaging system includes a first lens group including a first lens and a second lens, a second lens group including a third lens, a fourth lens, and a fifth lens, and a third lens group including a sixth lens and a seventh lens. The first to seventh lenses are arranged in order from an object side, at least one of the first lens group to the third lens group is moved on an optical axis to change a distance between the first lens group to the third lens group, and the following conditional expression is satisfied: 0.2 < BFL / ( 2 * IMG ? HT ) < 2. where BFL is a distance on the optical axis from an image-side surface of the seventh lens to an imaging surface of an image sensor, and IMG HT is half a diagonal length of the imaging surface of the image sensor.

Abstract: An apparatus for managing a battery includes a voltage sensor that measures a voltage of a battery cell mounted on a vehicle, and a processor that determines a short circuit risk of the battery cell.

Abstract: Proposed is a method for product recommendation by a server. The method may include receiving a gift recommendation request from a first user terminal for a second user, checking available basic information of the second user, and determining a first recommendation information based on the basic information, wherein the first recommendation information comprises a first recommendation reason and at least one product related to the first recommendation reason. The method may also include determining a second recommendation information not based on the basic information, wherein the second recommendation information comprises a second recommendation reason and at least one product related to the second recommendation reason. The method may further include providing recommendation information comprising the first and second recommendation information to the first user terminal. The first recommendation information may be prioritized for display over the second recommendation information.

Abstract: A battery management apparatus includes a control circuit configured to determine an internal resistance value for each of one or more battery cells included in a battery pack by using a current change amount of the battery pack and a voltage change amount of the one or more battery cells, and diagnose defects in the one or more battery cells by using internal resistance values of the one or more battery cells, in response to charging the battery pack, where the control circuit is configured to determine the current change amount of the battery pack and the voltage change amount of the one or more battery cells based on a current change request time point requiring a charging current change based on a voltage of the battery pack reaching a predetermined voltage during the charge of the battery pack.

Abstract: In an apparatus for correcting a voltage of a battery cell and a method thereof. The apparatus includes a voltage sensor configured for measuring voltages of a plurality of battery cells, and a controller which is configured for determining an amount of voltage change of each battery cell corresponding to a preset discharge current, detects target battery cells whose identification numbers have preset intervals while the amount of voltage change does not exceed a threshold value, and corrects the amount of voltage change of each target battery cell.

Abstract: A battery management apparatus includes a voltage sensor configured to measure a voltage of one or more battery cells, a control circuit configured to diagnose a defect in the one or more battery cells by determining a voltage change amount of the one or more battery cells using the voltage of the one or more battery cells measured by the voltage sensor, and a storage configured to store data and algorithms driven by the control circuit. The control circuit is configured to obtain a voltage for each battery cell by sequentially measuring the one or more battery cells, and to perform first voltage measurement on the one or more battery cells in a forward chronological order and to perform second voltage measurement on the one or more battery cells in a reverse chronological order.

Abstract: An apparatus for detecting soft shorts of a battery cell and a method for the same are provided. The apparatus includes a sensor to measure voltages of a plurality of battery cells, and a controller to determine a slope of a voltage of each battery cell, the deviation of the slope of the voltage for each battery cell, and detect a battery cell, which has the soft shorts, of the plurality of battery cells, based on the slope and the deviation.

Abstract: An apparatus for monitoring a battery of a vehicle includes one or more sensors and a processor, wherein the one or more sensors may obtain a first voltage during a stabilization time of the battery, obtain a minimum voltage measured from a time point when the stabilization time ends to a time point when parking of the vehicle ends as a second voltage of the battery, and detect a temperature of the battery from a time point when the first voltage is obtained to a time point when the second voltage is obtained, and the processor may determine a first discharge amount based on the first voltage and the second voltage, determine a second discharge amount consumed in balancing the battery and operating the one or more sensors, determine a first self-discharge amount and a second self-discharge amount based on the first discharge amount, the second discharge amount, and the temperature, and determine whether a short circuit has occurred in the battery based on the first self-discharge amount and the second self-di

Abstract: The present disclosure relates to a projection welding machine, and more particularly, to a projection welding machine for avoiding an accident in which an operator's hand gets caught between an upper electrode unit and a lower electrode unit, and preventing a fault in welding operation from occurring due to incorrect seating of a nut on the lower electrode unit.