Abstract: A data privilege control method includes configuring user metadata, dynamically configuring user classification according to the user metadata, dynamically configuring data read and write privilege according to the user classification, receiving a user access request, obtaining the user attributes and determining the user classification according to the user attributes, determining whether the user has a data read and write privilege according to the user classification, and authorizing the user's data read and write operations when it is determined that the user has data read and write privilege. The user metadata includes a number of user attributes.

Abstract: An earphone storage device includes a storage body having a bobbin, a track, and two sliders. The bobbin has a peripheral surface, an upper surface, a lower surface, a helical groove, and a protrusion. The helical groove is formed on the peripheral surface. The protrusion extends from the lower surface. The protrusion has a side surface and a hole formed in the side surface. The track is secured to the upper surface of the bobbin. The sliders are disposed on the track. The storage body stores earphones with an audio plug, earphone cords, and a pair of earbuds. The audio plug is inserted into the hole of the protrusion of the bobbin, the earphone cords are wound in the helical groove of the bobbin, and the earbuds are held by the sliders. The earphones can be securely stored, and the earphone cords do not tangle.

Abstract: A method for diagnosing faults in products of one type includes determining a fault type of the products and all of the underlying reasons for the fault which correspond to the fault type. A probability of each underlying reason is calculated and a decision tree is constructed, a root node of the decision tree being the determined fault type and all the underlying reasons being child nodes of the root node. When the decision tree is solved, the underlying reasons for the fault of that type of product can be presented.

Abstract: A camera antifogging assembly to prevent fogging of an internal camera due to temperature contrasts is coupled to a door of a refrigerator and includes a base, a camera, and an antifogging plate. The base is coupled to the door. The camera is coupled to the base. The antifogging plate includes a cover and a heat generator. The cover covers to the base. The heat generator is coupled to the cover and surrounds the camera. A refrigerator employing the camera antifogging assembly is also provided.

Abstract: A monitoring bracelet worn on an infant includes a camera, a prompter, a storage, and a processor. The processor controls the camera, when an object is grasped in a hand of the infant, to capture an image of the object. The processor analyzes size dimensions of the object according to the image and determines whether the object is able to fit inside the mouth of the infant, controls the camera to detect the object in real time when the object is determined to be able to fit inside the mouth of the infant and detects whether the mouth of the infant is opened, and controls the prompter to emit a prompt when the camera detects that the object is held steady in the hand of the infant and the mouth of the infant is opened.

Abstract: A variable spacing device includes a support member, a driving member, a number of movable graspers, a limiting block, and a pushing block. The movable graspers are slidably mounted in a line on the support member. Each movable grasper grasps a workpiece. The limiting block is mounted on the support member and arranged in parallel with the pushing member. The limiting block defines first sliding grooves having a length gradually decreasing along a same direction. The pushing block defines second sliding grooves having a length gradually increasing along a same direction. Each movable grasper moves within a corresponding one of the first sliding grooves and a corresponding one of the second sliding grooves. Two sidewalls of each first sliding groove and two sidewalls of each second sliding groove resist movement of the corresponding movable grasper.

Abstract: A sterilization assembly of a mobile device includes a bacteria detection device, a microwave sterilization device, and a processor. The bacteria detection device detects a bacterial count on the mobile device by emitting light waves and receiving reflected light waves and analyzing a wavelength change in the reflected light waves. The microwave sterilization device emits microwaves to kill the bacteria. The processor sends a detection signal to the bacteria detection device to control the bacteria detection device to detect the bacterial count, and sends a sterilization signal to the microwave sterilization device to control the microwave sterilization device to emit the microwaves. The bacteria detection device sends detection feedback information to the processor. The microwave sterilization device sends sterilization feedback information to the processor.

Abstract: An non-loosening and vibration-proof expanding screw includes a screw cap defining a receiving cavity, and a rod body connected to the screw cap. The rod body defines a hollow cavity, a sealing ring, and an air inlet pipe. The sealing ring includes a main body with a receiving hole and an internal ventilation pipe. The internal ventilation pipe includes interconnected first and second holes. The air inlet pipe is received in the first hole and gas under pressure can be introduced into the hollow cavity through the second hole. Thus the expanding screw can be inflated to expand and thereby lock the expanding screw and a securable object together, or be deflated to allow its release.

Abstract: An earphone case includes a shell, a rotating drum received in the shell, a driving assembly coupled to the rotating drum and configured for rotating the rotating drum, and a back cover latchable with the shell and receiving the driving assembly in a receiving space defined therein. The rotating drum is driven by the driving assembly to rotate to wind a wire of at least one pair of earphones.

Abstract: A key structure of an electronic device includes a connecting portion and a key portion. The connecting portion includes two electrode plates cooperatively defining an accommodating space. The key portion, when pressed, is moved toward the accommodating space and partially received within the accommodating space, thereby changing a capacitance between the two electrode plates. The key portion partially protrudes from the housing.

Abstract: A flatness detector includes a positioning plate, a positioning assembly arranged on a top surface of the positioning plate, a dial indicator arranged on the positioning assembly, and a sliding block. The positioning assembly includes a first positioning rod and a second positioning rod perpendicularly coupled together and pin-jointed. The dial indicator includes a detecting post maintained as a plumb line by the positioning assembly. The sliding block defines a groove for conforming to the detecting post. A measurement value of the dial indicator is obtained when the groove of the sliding block is conformed to the detecting post.

Abstract: A cleaning device connects to a mobile device through an interface. The cleaning device includes a trigger mechanism which includes at least one plate body, two elastic members connect to the plate body, and a baffle mechanism resting on the plate body. The baffle mechanism comprises at least one baffle, a torsion spring, and a processing unit. The baffle defines a first elastic sheet and the plate body defines a second elastic sheet. When a pressure is applied on the mobile device, the plate body is driven to rotate the baffle to make the first elastic sheet on the baffle contact the second elastic sheet on the plate body. The processing unit produces a trigger signal to execute a function of function modules when the first elastic sheet contacts the second elastic sheet.

Abstract: A method of splitting files applied to an electronic device includes obtaining a single file from a predetermined location. The number of blocks into which the file is to be split is calculated using a preset formula according to a capacity of a send buffer of a memory of the electronic device and also a calculated probability of availability of a transmitting channel. The file is split into the number of blocks.

Abstract: A method for guiding a robot includes controlling a wireless signal transmitting device of a charging base to transmit wireless signals, by sending a control signal to the charging base when a battery level of the robot is less than a preset level. Once an orientation of the charging base is determined according to signal strengths of wireless signals detected by at least one signal detecting device of the robot, a moving mechanism of the robot is controlled to drive the robot to move towards the orientation of the charging base.

Abstract: A method for guiding a robot towards a charging base includes controlling a device of the charging base to emit sound when a battery level of the robot is less than a preset level. Once an orientation of the charging base in relation to the robot is determined, according to signal strengths of audio signals detected by microphone of the robot, a moving mechanism of the robot is controlled to drive the robot to move towards the charging base.

Abstract: A screen assembly of a mobile device which can be expanded for a larger viewing area includes a body and a back cover. The body has a main screen and a slot to one side. The back cover is detachably mounted on a rear surface of the body. The back cover has a mounting board with auxiliary screen thereon and an insertion board. The back cover is mounted on the rear surface of the body when the auxiliary screen is not deployed, and the insertion board of the back cover is inserted into the slot of the body when the auxiliary screen is deployed.

Abstract: An interactive robot includes an image capturing device, an audio capturing device, an output device, and a processor. The processor is configured to obtain audio information captured by the audio capturing device and image information captured by the image capturing device, recognize a target from the audio information and the image information, confirm basic information and event information of the target and link the basic information with the event information, obtain key information from the event information of the target, implement a neural network analysis algorithm on the key information to confirm an emotion type of the target, search a preset public knowledge database according to the key information to obtain a relevant result, apply a deep learning algorithm on the relevant result and the emotion type of the target to determine a response, and execute the response through the output device.

Abstract: A support for video playback devices includes a headwear device, a support mechanism, and a holding mechanism. The support mechanism is connected to the headwear device. The holding mechanism is connected to the support mechanism, and is used to hold a video playback device. Viewing distance and angle of the video playback device is adjusted by varying relative positions of the headwear device and the support mechanism and by varying relative positions of the support mechanism and the holding mechanism. The structure of the support for video playback devices is simple. The support for video playback devices is useful when a user lies down, thus improving the user's sense of experience.

Abstract: A storage device includes a first case, a second case, and a winding body. The first case includes a first connecting portion. The second case includes a second connecting portion. The winding body winds an object thereon. The first connecting portion is slidably coupled within the second connecting portion. The winding body is sleeved over the second connecting portion.

Abstract: A fixing apparatus for holding a circuit board in place includes a cover plate, a base for supporting the circuit board thereon, a connecting assembly for hinge-coupling a first end of the cover plate to the base, and a latching assembly for latching a second end of the cover plate to the base. The circuit board is held in place between the base and the cover plate.