61 results about "Trap door" patented technology

A landing pad receives and stores packages delivered from an aerial vehicle or awaiting pickup from an aerial vehicle. The landing pad can be placed outside of a window and can contain a transmitter for sending out an identification signal via radio frequency to aid aerial vehicles in finding the landing pad. The landing pad contains a landing platform with a trapdoor that leads to a storage compartment. The trapdoor can be configured to only open when it receives a signal from an authorized aerial vehicle. The storage compartment can be accessed via a storage compartment door which can contain a locking mechanism. The storage compartment can be climate controlled. The landing pad can also have a transmitter that emits sounds to discourage animals from nesting on or near the landing pad. The landing pad can also include a solar power generator as a source of electrical energy.

The invention discloses a forward security dynamic symmetric searchable encryption method without a client state, which comprises the following steps: in an initialization stage, a client generates a client key, and a server initializes an update count and each data structure; in the updating stage, the client side obtains and increases the updating count of the server side, based on the updating count and the target updating keyword, a limited pseudo-random function CPRF is used for generating an updating trap door and sending the updating trap door to the server side, and the server side executes updating according to the updating trap door; in the search stage, the client obtains the update count of the server, generates a search trap door based on the update count and the target keyword by using the limited pseudo-random function and sends the search trap door to the server, and the server executes search according to the search trap door to obtain a result and reorganizes the result into a cache to accelerate subsequent search. According to the method, the problems of client storage expansion and difficulty in multi-client deployment in the current forward security dynamic symmetric searchable encryption scheme can be solved.

A drive thru EV battery swap station comprising a drive in facility, a roller conveyor belt, mechanical wedges and a trap door mechanism to allow for precise vehicle positioning and to reveal a robotic interface tray. The robotic arm and interface tray operate in coordination to remove the battery from the vehicle and replace with a fully charged battery. Also claimed is a method of extracting the battery, placing it into a battery storage and charging facility, and the robotic arm positions the new battery into the electric vehicle. The swap station communicates with the robotic arm and selects a fully charged battery. Also claimed is the battery swapping process taking no longer than five minutes, and a battery subscription model. The battery swap station has network capability via a dedicated mobile application or the vehicle control panel. Also claimed is a method of protecting the swapping station from unauthorised use with encryption protocols and monitoring.

A package theft prevention system comprising a mailbox defining an irregularly shaped interior compartment for storage of received packages. The lower portion of the mailbox has an outward, distally tapering wall for anchoring to concrete it is embedded in. The uppermost opening to the mailbox has a package door biased in the closed condition, where, just downward of the package door is a self-closing trap door biased in its closed position. As the package door and the trap door are offset and open in opposing directions, removal of packages from the upper opening is frustrated while receipt by the deliverer is facilitated. A lockable rear door below the upper opening provides access to the interior compartment for the owner.

A burrowing animal trap is provided and is designed to enclose the entrance to a burrow and appear to the animal as an extension of the burrow. As a result, the animal will be likely to enter the animal trap under the mistaken belief that it is exiting the burrow. The burrowing animal trap has a capture mechanism that includes a pivoting trap door.

The invention discloses a password-based train control system data secure transmission method and a password-based train control system data secure transmission system. The system is used for data transmission between a train control data owner and a train control data user, and comprises an identity authentication module deployed on a key management center, a data encryption module and a data uploading module which are deployed on the train control data owner, and a data storage module and a ciphertext search module which are deployed on a train control center, the trap door generation module and the data decryption module are deployed on a train control data user. According to the method, a password-based key derivation mechanism is adopted, and bilinear mapping and a hash function are combined, so that the complexity of key management in the train control system and the user operation burden are remarkably reduced, meanwhile, the confidentiality and integrity of train control data transmission are guaranteed, the bottleneck that efficient query cannot be performed after encryption in a traditional encryption method is solved, and the encryption efficiency is improved. And the comprehensive performance of the train control system in the aspects of data security and real-time performance is improved.

The invention discloses a medical image encryption method based on a trap door network and a diffusion model, and relates to the technical field of image encryption. The method comprises the following steps: encrypting a focus image scanned by medical equipment of a patient by using a session key through key negotiation between the patient and a doctor, and sending the encrypted image to an image filing and communication server; and when the doctor needs to look up the lesion image, decrypting the ciphertext image through the previously established session key, and recovering the corresponding original lesion image. The image encryption / decryption network of the invention is composed of a Diffusion model and a trap door network. The trap door network enhances the security of the medical image encryption method, and the forward generation and sampling process based on the Diffusion model ensures the security of the encrypted image and the high-quality reconstruction effect of the decrypted image.

This game table (1) comprises a hexagonal platform (2), a base (3) supporting said platform (2) substantially parallel to the ground, a plurality of pucks (9), said platform (2) being divided into six trapezoidal quadrants separated by six longitudinal members (12) and forming six consecutive boards (8) joined end to end, the table (1) further comprising a central receptacle (14) around which the boards (8) are arranged, which is formed of six walls (20), each wall (20) interfacing the interior of the central receptacle (14) and only one of the boards (8) and comprising a passage (22) connecting said board (8) with the interior of the central receptacle (14), the table (1) further comprising an elastic band (10) per board (8) stretched parallel to an edge of said board (8). Figure for the abbreviation: Fig 1

The invention discloses an access control encryption and decryption method and system based on content detection, and belongs to the technical field of cryptography, and the method comprises the following steps: initializing a global parameter and a main private key by an access control strategy and a security parameter input by a central authority, and generating a trap door; and sending the main private key to a sender authority to generate an encryption key for the sender. And the sender encrypts the information by using the encryption key, and then sends a ciphertext to the purifier. And the purifier purifies the ciphertext, and broadcasts the purified ciphertext to all receivers. Except a sender and a receiver which conform to an access control strategy, corresponding information cannot be transmitted and received through the method. According to the scheme, through cooperation and cooperation of all participants, on the basis of ensuring sensitive information supervision efficiency, encrypted transmission and identity verification of user information are achieved, sensitive information and identity information privacy of users are fully protected, and therefore the technical problem that in the prior art, a stealing risk exists in sensitive information transmission and storage is solved.

This invention discloses a door lock coordination method and system for emergency rescue. The method includes: triggering all door locks in the building to enter rescue mode and activating voice monitoring; based on the trapped person's response via a smart terminal, the door lock of the trapped room sends a rescue call reply message; based on the event that the neighboring door lock of the door where the rescuer is located receives the reply message, triggering the router to establish a filtering and forwarding binding; the neighboring door lock decides whether to become a relay door lock based on location relationship and broadcasts guidance voice; based on the event that the rescuer arrives at the relay door lock and is detected by its RFID, the door lock releases its own filtering binding; the neighboring door lock at the rescuer's new location sends an extended IGMP join message to establish a new binding; based on the event that the relay door lock determines that the trapped door lock is its direct neighbor, guiding the rescuer directly to the target room. Using this embodiment of the invention, decentralized, adaptive personnel positioning and relay guidance can be achieved, improving the real-time performance and reliability of emergency rescue.

An automated system for singulating and dispensing an object from a bunch of objects comprises: a hopper adapted to hold the bunch of objects; a rotating drum arranged adjacent the hopper and comprising at least one cutout to pick up one object at a time from the bunch of objects in the hopper; a funnel arranged on an opposing side of the drum to the hopper, wherein the drum is operable to transfer one of the objects at a time from the hopper to the funnel; and a trapdoor assembly at the base of the funnel comprising a first closed configuration for staging the object, and a second open configuration for transferring the object to a processing area for further processing. Computer and electronics are programmed and operable to control the modules. Related methods are described.

A server door assembly including at least one side mounting panel, a pivoting door disposed coupled to the at least one side mounting panel, wherein the pivoting door includes a first door component coupled to a pivot point of the side mounting panel, and a second door component configured to slide along the first component as the first component pivots about the pivot point.

The utility model discloses a movable outdoor mouse trapping device, which belongs to the technical field of mouse trapping, and comprises a cage body mechanism and a movable plate door mechanism, the bottom end of the cage body mechanism is provided with a bearing mechanism for collecting mouse excrement and urine in a sliding manner, and the movable plate door mechanism is arranged on the cage body mechanism. A trapdoor mechanism used for preventing rats from escaping is fixed to the inner side of the cage body mechanism. Through the arrangement of the cage body mechanism, the bearing mechanism and the movable plate door mechanism, the device can continuously trap mice, effectively prevents the mice from escaping, can collect urine and excrement of the mice and prevents the environment from being polluted by the excrement and the urine of the trapped mice, and through the arrangement of the bait mechanism and the bait pressing mechanism, the device can be used for continuously trapping the mice. According to the mouse trapping device, the mouse and the bait are isolated while it is guaranteed that the smell of the bait can be normally emitted, so that the trapped mouse is prevented from eating the bait, the bait can be rolled, and the strong smell can be released through a small amount of bait.

The invention designs a forward and backward security searchable encryption method and system supporting access authorization. Comprising the steps that when a data owner uploads data, an access control strategy of the data is uploaded at the same time, and the autonomy of a user to the data is improved; before a data user retrieves the data, an access control authorization link is added, fine-grained access control of the encrypted data is achieved, and the practicability and the safety of ciphertext data retrieval are improved; a probabilistic trap door generation algorithm is designed, random numbers are added into trap door information, so that different trap doors are generated in each retrieval, and off-line keyword guessing attacks are resisted; based on a puncturable encryption primitive, an entry is operated to add a label, and a ciphertext with a specific label is deleted by updating a key, so that backward security is realized; and an updatable encryption technology is introduced, and a client key and an encryption database are updated according to an updating strategy, so that the security risk caused by key damage is avoided, and the security of the searchable encryption method is further improved.

A loading system for loading open-topped containers 200 such as lorries / trucks / tractors / trailers and other vehicles 210, with a bulk material / product is disclosed. The system comprises a loadi

The invention provides an anonymous and keyword-guessing-attack-resistant attribute-based rapid ciphertext retrieval method, which comprises the following steps that: an authorization center initializes to generate system parameters and a master key, publishes the system parameters, and generates a user key according to attribute information of each user; a data owner generates a data owner public and private key pair and discloses a public key. Before the data owner uploads the encrypted data, attribute-based searchable encryption is carried out on the keyword index. And the data user uses the user key and the keyword to generate a searchable trap door and sends the searchable trap door to the cloud server. And the cloud server matches the encrypted index with the trap door. If the attribute contained in the ciphertext meets the access control strategy in the trap door and the keywords are matched, the matching is successful. According to the method, the calculation efficiency of the algorithm is greatly improved, the communication overhead is reduced, and efficient attribute-based ciphertext retrieval which is anonymous and resistant to keyword guessing attacks is achieved.

An assembly and method of forming a dispenser assembly that is constructed to sequentially dispense respective container lids from a stack of container lids housed in the dispenser assembly. The dispenser assembly includes a housing that is generally defined by a base, a cover, a top, and a lid. A guide tube depends from the top and generally overlies a trap door that is operationally connected to an actuator assembly and a drive assembly. A separator assembly is connected to the drive assembly and operative to effectuate separation of discrete lids from an end of the stack of lids during operation of the trap door during each dispense event.

A mechanical elevator safety system (100) with pulley-operated trapdoors, comprising: a plurality of trapdoors installed at respective floors within the elevator shaft, each trapdoor configured to cover the opening of the elevator shaft at its respective floor when in the closed position; a pulley system mechanically connected to an elevator car and each of the trapdoors; where the vertical movement of the elevator car activates the pulley system to open the trapdoor on the destination floor before the elevator arrives, and the trapdoor closes automatically as soon as the elevator departs.

The invention discloses an anti-quantum traceable anonymous authentication method and system for a mobile internet of things, and belongs to the technical field of identity authentication and tracking. The method comprises an initialization stage, a mobile Internet of Things equipment registration stage, a mobile Internet of Things equipment authentication stage and a mobile Internet of Things equipment tracking and revocation stage. Bidirectional authentication and session key negotiation between an edge node and equipment are realized by utilizing a lattice-based chameleon hash and a short integer solution problem, quantum computing attacks are resisted, and meanwhile, the equipment identity and path privacy are protected through block chain evidence storage and a chameleon hash trap door technology, and the security of the equipment is improved. And on-demand accurate tracing and rapid revocation of malicious equipment by a law enforcement agency can be supported, and the requirements of safety, privacy and supervision in a mobile Internet of Things scene are met.

A device for extracting food from a tank of an animal feeder where it is designed to be fastened. The device includes an opening, which in turn includes a frame, formed by a U-shaped sheet that has a hole located in each wing of the U-shape, and a food extracting mechanism that is fastened to the frame with the ability to rotate. The food extracting mechanism includes a trap door joined to a tube to house a shaft that is fastened to the frame through the holes.

A compact waste combustion system deployed within a portable toilet has a burn chamber that includes a processor, a burner, a trapdoor mechanism configured to seal an entrance to the burn chamber when the compact waste combustion system is operated in a first mode and a waste receptacle configured to feed waste material to the burn chamber through the trapdoor mechanism in a second mode of operation. The processor may be configured to detect presence of a waste in the waste receptacle, configure the system to operate in the second mode and to pass waste into the burn chamber, configure the compact waste combustion system to operate in the first mode after the waste has passed into the burn chamber, and activate the burner when the compact waste combustion system is operated in the first mode and the waste is located in the burn chamber.

The invention relates to a wall-hung toilet installation (1) comprising: - a frame (2) coupled to a supporting structure, and located behind a wall (10); - a toilet bowl (3) located in front of the wall (10) and suspended from the frame (2) through the wall (10); - a water tank (4) mounted on the frame; - a filling system (5) and a flushing mechanism (6) mounted behind the wall (10), the installation (1) comprising at least one hatch (7) provided in the wall (10) for accessing connection means (52) of the filling system (5) and coupling means (61) of the flushing mechanism (6), located outside the tank (4).

The encryption method is implemented in a system defining a public key (pk) to obtain a password (C) by encrypting data (m) comprising a base character m [i], the public key (pk) comprising:-an element gc, i, for any integer i between 1 and an integer u, the element gc, i being in the form of g (ac, i), where ac, i is an integer between 0 and an integer p-1, g is a generator of group G; -an element hk for any integer k between 1 and integer t, the element hk having the form of g (1 / bk), where bk is an integer between 0 and p-1; -a generator g; description of group G; and-a description of a function H having values in a finite set, said method comprising the steps of:-selecting (C22) an integer a between 0 and p-1; calculating (C24) a value Ek = H (hk (a)) for any integer k between 1 and integer t; calculating (C26), for any integer i between 1 and an integer u, a value Ci equal to ga [i], ia, obtaining (C28) a password (C) consisting of elements {Ek, Ci}.

The invention discloses a lattice-based anti-quantum trap door random permutation function construction method, and belongs to the technical field of public key cryptographic algorithm design, and the method comprises the steps: S1, selecting parameters meeting requirements according to actual demands; s2, selecting an auxiliary function according to the selected parameters; S3, generating a permutation function defined on the auxiliary function; s4, trap door inversion operation is carried out on the replacement function value output in the step S3, and a trap door random replacement function is obtained; according to the lattice-based anti-quantum trap door random permutation function construction method provided by the invention, the unidirectivity and collision resistance of the function are established on the difficulty of the lattice problem, so that the function is provided with the capability of resisting the attack of a quantum computer, and the potential safety hazard of the existing trap door permutation function in the post-quantum era is solved.

The invention discloses a digital signature method based on an approximate trap door under an on-lattice standard model, and the method comprises the steps: generating a public parameter, a main public key and a main private key through a system parameter generation device according to a system safety parameter; generating a signature vector of the to-be-signed message through a signature generation device according to the main public key, the main private key and the to-be-signed message; verifying the validity of the signature through a signature verification device according to the main public key, the to-be-signed message and the signature vector; wherein in the signature generation process, an approximate trap door expansion generation device and an approximate trap door sampling device are adopted, and the approximate trap door sampling device is used for carrying out geometric compensation on distribution deviation caused by using an approximate trap door, so that output distribution of signature vectors and ideal spherical discrete Gaussian distribution are indistinguishable in statistics. According to the method, significant compression of the public key and the signature size is realized, and an efficient signature solution is provided for quantum cryptography.

The invention relates to the field of privacy protection query schemes, in particular to an indoor multi-user personalized space keyword privacy query method based on a GIS enhanced index tree. According to the requirements of multiple users for space keyword privacy query in an indoor environment, encryption indexing is carried out on space and text information of an indoor object by constructing a GISEnhancedIndexTree index structure fusing a Hilbert code, an R tree, a densely distributed filter and an EASPE encryption vector. In the query process, a user request is encrypted into a trap door, and the server sequentially executes space, floor and keyword pre-filtering, encryption vector similarity calculation by means of EASPE, threshold filtering, score aggregation and sorting in the index tree and then returns an encryption result to the user. And meanwhile, a comprehensive position vector construction and local coordinate system-based privacy protection coordinate conversion method is designed, so that the privacy security of the whole flow of data is ensured. According to the method, the efficiency and accuracy of indoor multi-user personalized spatial keyword query are improved while the user privacy is effectively protected.

A palletizer for stacking cargo, such as bags or boxes, onto a pallet in multiple layers is disclosed. The palletizer includes a main frame extending in vertical direction; pallet lifting means for lifting a pallet, which pallet lifting means are arranged to the main frame and are movable in vertical direction between the base of the main frame and the top of the main frame; a manipulator arranged to the top of the main frame for positioning the cargo and forming a layer on top of a pallet lifted by the pallet lifting means; and a supply main conveyor, such as a belt conveyor, arranged with one end to the top of the main frame for supplying cargo to the manipulator. The manipulator includes a sub-frame movable in a horizontal plane relative to the top of the main frame; a first floor arranged in the sub-frame and a second floor arranged in the sub-frame and above the first floor, wherein each floor has an opening, which can be closed by a door, such as a trap door, and wherein the openings in the floors are aligned when viewed in a vertical direction; and a supply sub conveyor arranged with one end adjacent to the one end of the supply main conveyor and arranged with the other end to the sub-frame and adjacent to the opening in second floor, such that cargo is conveyed on top of the door closing the opening in the second floor. The first floor is rotatable relative to the sub-frame and around a vertical axis.

To address such a problem that rats are often caught in wire mesh cage traps, but effectiveness of the traps is halved because the wire mesh is see-through, making it too bright inside, creating a dead end where the rat cannot escape when attacked, and an entrance is on one side, so rats coming from the opposite direction cannot get in, and to provide a rat trap with entrances on both sides using a polyvinyl chloride pipe that is familiar to rats, because rats often enter and exit PVC pipes in drainage ditches.MEANS FOR SOLVING THE PROBLEM: Both ends of a horizontally placed vinyl chloride pipe are cut vertically to provide left / right rat entry holes, and trap sliding grooves are provided inside the pipe at a place slightly separated therefrom by diagonally opening toward a ceiling. After that, left / right trap doors that go up and down in the grooves are just made to complete the skeleton, and since an existing pipe is used, the process is short. The trap is easy to use, the left / right trap doors are lifted in an inverse-V-shape up to the space above the pipe, both the doors are stretched with a string to hold them stationarily, and a bait stick is hung on the string and suspended in the pipe. When a rat enters from either of the entry holds and bites the bait, a razor blade attached to the stick cuts the string, causing both left and right doors to fall simultaneously, trapping the rat inside the pipe.SELECTED DRAWING: Figure 1

An order picking workstation (100) comprising, a picking desk (20) having an inbound surface space (21) for receiving donor load units (41) for storing items (30,31,32,33) to be picked and an outbound surface space (22) for receiving receiver load units (42) for receiving picked items, an automated item buffer (100) comprising a conveyor system (101) carrying multiple buffer locations (102) for temporarily storing items (30,31,32,33) after unloading from said donor load units (41), said multiple buffer locations (102) moving in a closed loop, and wherein at least one of said multiple buffer locations (102) is arranged as a hatch or trapdoor (104) such that said at least one of said multiple buffer locations (102) can offload said items at a predetermined position (105) in said loop, and wherein said predetermined position (105) in said loop is located above one of said receiver load units (42) such that said hatch or trapdoor (104) is configured to open and offload said items (30,31,32,33) into said receiver load unit (42).

The invention provides a forked tunnel fire ventilation and smoke exhaust experimental device and experimental method, and relates to the technical field of tunnel fire ventilation and smoke exhaust. The device comprises a bifurcated tunnel model, the bifurcated tunnel model comprises a main tunnel and ramps communicated with the main tunnel, a detachable smoke exhaust vertical shaft is installed on a ceiling of the main tunnel, a lateral smoke exhaust port is formed in the side wall of the main tunnel, and the smoke exhaust vertical shaft is opened and closed through a movable plate door and can be replaced by vertical shafts of different sizes or angles; the ventilation system comprises a jet fan mounted at the ventilation opening and is used for simulating different ventilation modes; the experimental test system comprises a temperature acquisition system and a wind speed acquisition system, the temperature acquisition system measures temperature through a plurality of thermocouples arranged on the ceiling, and the wind speed acquisition system measures wind speed distribution through a wind speed probe array arranged on the cross section of the tunnel; and the fire source device provides an experimental fire source. According to the embodiment provided by the invention, the accuracy of the ventilation and smoke exhaust experiment result in the bifurcated tunnel scene is improved, and diversified experiment requirements are met.