WO2020251331A1 - Système et procédé de gestion de ressources et de services de l'internet des objets et support d'enregistrement lisible par ordinateur dans lequel est enregistré un programme d'exécution dudit procédé - Google Patents

Système et procédé de gestion de ressources et de services de l'internet des objets et support d'enregistrement lisible par ordinateur dans lequel est enregistré un programme d'exécution dudit procédé Download PDF

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WO2020251331A1
WO2020251331A1 PCT/KR2020/007730 KR2020007730W WO2020251331A1 WO 2020251331 A1 WO2020251331 A1 WO 2020251331A1 KR 2020007730 W KR2020007730 W KR 2020007730W WO 2020251331 A1 WO2020251331 A1 WO 2020251331A1
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service
virtual
management
virtual object
management function
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PCT/KR2020/007730
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English (en)
Korean (ko)
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김도현
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제주대학교 산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/22—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks comprising specially adapted graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services

Definitions

  • the present invention relates to a virtual object that virtualizes a sensor, a driver, a device, and a network resource of the Internet of Things, and a system and method for managing a service object created using these objects.
  • IoT The Internet of Things
  • WSN Wireless Sensor Network
  • USN ubiquitous sensor network
  • WSN Wireless Sensor Network
  • USN ubiquitous sensor network
  • M2M Machine to Machine
  • IoT can be defined as a network of things space that cooperatively forms intelligent relationships such as networking and information processing with respect to three distributed environmental elements of humans, objects, and services without explicit human intervention.
  • various concepts and technologies such as Web of Thing (WoT, hereinafter referred to as WoT) have been proposed in order to link various devices with the Web. Due to the development of these concepts and technologies, the use of devices that can easily connect to the Internet is expected to increase.
  • IoT Internet of Things
  • the first step in developing IoT-based applications is to virtualize the physical device by abstracting the device properties of the virtual object. You can later combine these virtual objects to form a variety of services for different applications.
  • Many existing systems provide virtual services for configuring physical devices and services. However, when too many devices and services are added to the IoT network with the growth of the network, management and control becomes difficult, and it is predicted that effective management becomes difficult to manage and check the status of individual devices.
  • the present invention was conceived to solve the above problems, and an object of the present invention is to virtualize physical sensors, drivers, devices and registered devices constituting the Internet of Things (IoT) as virtual objects, and virtualized physical sensors, It facilitates configuration and failure management of drivers, devices, and networks through virtual objects, and also manages failures and configurations of service objects created using virtual objects, and control operations and operations supported by selected devices and resources
  • IoT Internet of Things
  • the objective is to provide a virtual object management system with extensive expandability by visualizing and providing an interface for checking whether or not a fault condition exists.
  • a first layer module configured to configure a physical layer by being connected to at least one object that is an object device or a sensor ( 100);
  • a service composition layer for synthesizing a service object (SO) by combining functions provided by two or more virtual objects constituting the second layer module includes a third layer module 300;
  • a service virtual object management module 400 that reads information of the virtual objects and service objects of the second layer module and the third layer module, performs failure and configuration management, and is exposed to external applications.
  • a first step of defining a resource of an object based on location information and operation information of the object by applying the above-described virtual object and service management system of the IoT, and registering the object using this;
  • a virtual object of a physical sensor, a driving body, a device, and a registered device constituting the Internet of Things (IoT) is virtualized, and the virtual physical sensor, driving body, device, and network are virtualized through a virtual object. It facilitates configuration and failure management work, and also maximizes the efficiency of failure and configuration management of service objects created using virtual objects.
  • IoT Internet of Things
  • FIG. 1 is a block diagram showing a basic configuration of a virtual object and service management system (hereinafter referred to as'the present invention') of the IoT according to an embodiment of the present invention
  • FIG. 2 is a detailed configuration of FIG. It is a hierarchical block diagram that implements one function.
  • FIG. 3 is a system architecture flow diagram illustrating an implementation process of the present invention of FIG. 2.
  • FIG. 4 shows the configuration of the service virtualization object management module of FIG. 1.
  • FIG. 5 is a flow chart showing the function of the configuration management unit 410 in FIG. 4, and FIG. 6 is a diagram showing an algorithm for implementing the function of the configuration management unit.
  • FIG. 7 is a flowchart of a combination management function that implements the function of the combination management unit 420 in FIG. 4, and FIG. 8 shows an algorithm code for implementing the defect management function.
  • the present invention provides a system and a method for managing a virtual object of an IoT sensor, a driver, a device, and a network resource, and a service object created by using these objects.
  • IoT Internet of Things
  • services of registered devices are virtualized, and virtualized objects and service objects are created through them. It manages network resources and network resources, facilitates configuration and failure management of service objects created using virtual objects, and provides a management system for checking control operations, operation status, and failure status supported by selected devices or resources.
  • the main idea is to provide.
  • FIG. 1 is a block diagram showing a basic configuration of a virtual object and service management system (hereinafter referred to as'the present invention') of the IoT according to an embodiment of the present invention
  • FIG. 2 is a detailed configuration of FIG. It is a hierarchical block diagram that implements one function.
  • the present invention relates to a first layer module 100 that is connected to at least one object that is an object device or a sensor to configure a physical layer, and objects and applications constituting the first layer module.
  • the second layer module 200 configured to configure a virtual layer that communicates through communication and captures the characteristics and motions of the object in the form of a virtual object, stores it in a database, and creates a virtual object (VO).
  • the service configuration layer for synthesizing a service object (SO) by combining functions provided by two or more virtual objects constituting a configuration layer is a third layer module 300 and a virtual layer of the second layer module and the third layer module. It reads information of the object and service object to perform failure and configuration management, and may be configured to include a service virtual object management module 400 that is exposed to external applications.
  • the first layer module 100 is a configuration configured to form a physical layer by being connected to at least one object that is an object device or a sensor, and the object device of the first layer module 100 includes an Internet of Things device and a web of things. It is at least one of a device or a device of all things, and may be configured to include a device for collecting data from the surroundings or an actuator for controlling context parameters.
  • things constituting the physical layer which is the composition of the first layer module, are mainly two types of devices.
  • the physical layer composed of sensors collects data from the surroundings. It is an electronic and/or electromechanical device, and
  • an actuator is used to control context parameters through actuation, and in embodiments of the present invention, objects may include both sensing and operating objects.
  • the second layer module 200 is composed of a virtual object layer, which may represent a physical layer object in the form of a virtual object (VO).
  • a virtual object (VO) represents an object that encapsulates information related to the physical in the physical layer in the system.
  • VDM Virtual Device Manager
  • the virtual objects of the virtual object layer are utilized by the service configuration layer to synthesize a service object (SO) by combining functions provided by two or more virtual objects.
  • the second layer module 200 enables virtualization of sensors, drivers, devices and further network resources of the IoT. In other words, it virtualizes the physical sensors, drivers, devices and registered devices that make up the Internet of Things (IoT) as virtual objects, and facilitates configuration and failure management of virtual physical sensors, drivers, devices and networks through virtual objects. To be able to do it.
  • a service object is implemented by combining the provided functions, but at least one of the formed service objects may include an input virtualization object combined with an output stream to display the collected data.
  • a simple service object SO may include an input virtual object VO combined with an output stream to display the collected data.
  • a more complex example of such a service object is to combine the temperature sensor virtual object VO with the fan virtual object VO with a setting that the fan must be turned on when the temperature value exceeds x degrees Celsius. Acquisition and operation of the temperature value of the fan depends on the function encapsulated in the corresponding virtual object (VO). In this case, it can be used to perform this layer of work by applying a professional service configuration management (SCM) application.
  • SCM professional service configuration management
  • the virtual object and service management system of the IoT operates normally when registration devices and services are restricted in an IoT system having three basic layers, such as physical, virtual, and service configuration, as described above. However, if the system grows and too many virtual objects are added, device management becomes difficult.
  • the present invention provides a service and virtual object management module 400 to effectively control services and virtual objects to facilitate management of a provided system, and the second layer module shown in FIG. It is possible to operate in 200 and the third layer module 300.
  • the service and virtual object management module 400 virtualizes the services of physical sensors, drivers, devices and network resources and registered devices constituting the Internet of Things (IoT) in the second layer module 200, Through the third layer module 300, a virtualized service object is created, and through this, physical sensors, drivers, devices and network resources are managed, and the service object created using the virtual object is configured and failure management work. To be able to perform. Furthermore, it is possible to check the control operation, operation status, and failure status supported by the selected device or resource. In particular, by visualizing and providing an interface for checking the control operation, operation status, and failure status supported by the selected device and resource, it is possible to realize the efficiency of a virtual object management system that has a wide range of expandability.
  • IoT Internet of Things
  • FIG. 3 is a system architecture flow diagram illustrating an implementation process of the present invention of FIG. 2.
  • the first layer module 100 devices such as sensors 1, 2, ....n and actuators 1, 2, ....n constituting an IoT device are used. It derives the detected information by having the information of Thereafter, the second layer module 200 captures the characteristics and operations of physical and physical IoT devices (sensors and actuators) in the form of virtual objects through a device virtualization process and stores them in a database. The virtual object information is utilized by the service configuration process to build a service object in the third layer module 300.
  • the Services and Virtual Objects Management (SVOM) 400 reads stored virtual object (VO) and service object (SO) information to facilitate failure and configuration management.
  • VO virtual object
  • SO service object
  • the service virtualization object management module 400 may also provide an interactive service for device access and control through a virtual object (401), and external customized applications and services are configured through an API as a method of implementing a management function. It may be exposed 402 to the module.
  • a virtual object 401
  • external customized applications and services are configured through an API as a method of implementing a management function. It may be exposed 402 to the module.
  • the configuration of the Services and Virtual Objects Management (SVOM) 400 in the present invention can be classified as shown in FIG. 4.
  • the service virtualization object management module (Services and Virtual Objects Management; SVOM (400)), a configuration management unit 410 that displays the installation location and services related to a specific object registered as a virtual object and registered as a virtual object. It may be configured to include a defect management unit 420 that displays the operation state and the defect state of a specific object.
  • SVOM Service and Virtual Objects Management
  • the configuration management unit 410 of the service virtual object management module 400 provides an interface to search and display the specifications of the registered virtual object (VO) and service object (SO), and the interface is A location-based management function 411 that displays virtual objects and services in an area, a service device type-based management function 412 that visualizes and displays all devices and services located in the selected area, and the location-based management function and service device It is possible to provide a fusion management function 413 that simultaneously displays the type-based management functions by fusion.
  • FIG. 5 is a flow chart showing the function of the configuration management unit 410 in FIG. 4, and FIG. 6 is a diagram showing an algorithm for implementing the function of the configuration management unit.
  • the configuration management unit 410 may provide an interface for searching for specifications of registered virtual objects and services in three different ways.
  • the user terminal may display virtual objects and services in a selected area. Thereafter, the user terminal may select the diameter of the circle and then click the map to select the center of the region of interest (see FIGS. 10 and 11).
  • the service device type-based management function 412 allows all devices and services located in the circular area selected by the user to be displayed.
  • the service device type-based management function 412 is useful when too many devices are registered in the system and it becomes very difficult to find or select a specific device that a user needs.
  • the service device type-based management function 412 provides a function for a user to designate a device/service of a desired type in order to visualize a specific type of device or service.
  • the convergence management function (Hybrid) 413 provides a combination function of more than two approaches, such as location-based management and service-based management function described above.
  • the user terminal can search for a specific type of device or service in the selected area by selecting the radius of the circular area and defining the center by clicking the map.
  • the algorithm pseudo-code implementing the configuration management unit 410 of the present invention is shown in FIG. 5.
  • the code posted in FIG. 5 makes it possible to get a list of registered virtual objects as input, along with optional parameters such as device type, location and range. Thereafter, if the user satisfies the desired parameter values, all registered device types and locations are checked and then added to the output list finally returned by this algorithm.
  • FIG. 7 is a flowchart of a combined management function implementing the function of the defect management unit 420 in FIG. 4, and FIG. 8 is a diagram illustrating an algorithm code for implementing the defect management function.
  • the defect management unit 420 provides an interface for searching and displaying the current status of the registered virtual object VO and service object SO. It is possible to provide an operating state management function 421 that displays whether the device is currently operating or idle, and a defect state management function 422 that displays whether all devices are fixed or not.
  • the defect management unit 420 the operational state management function 421, focuses on finding work/non-operation and idle/busy devices and services. It makes it easy to obtain the current status of registered devices and services through CoAP communication.
  • operational status management can be used, and the current idle/busy status of a registered device or service can be found.
  • the state of the device or service is set to being in use. Otherwise, if the device or service is not used by the application for a certain period of time, it becomes idle.
  • the fault condition management function 422 provides a list of non-functional devices where fault condition management can easily locate such a device for repair or replacement.
  • a simple keep alive query (CoAP GET command) is sent to all devices, and if there is no response within a certain period of time, it retry the specified number of times. If all retry attempts fail, the device is labeled as not working.
  • the defect management unit 420 takes a list of registered virtual objects as input, and uses a Uniform Resource Identifier (URI) to obtain information on the current state. If there is no response even if the threshold is exceeded after setting the maximum attempt threshold of the connection attempt, it is regarded as "not working", and the output list is the fault status information of each virtual object. It can be operated to include. These output lists can also be used by applications to identify defective devices for repair or replacement.
  • URI Uniform Resource Identifier
  • FIG. 9 shows an API list of the service virtualization object management system of the present invention. That is, as an embodiment of the present invention, in FIG. 9, a prototype for managing IoT services and virtual objects is implemented using C# in Visual Studio 2015. The CoAP.NET library is used to access IoT resources attached to the Intel Edison board.
  • CoAP.NET implementation is based on the Californium(Cf) framework implemented in Java.
  • Microsoft SQL Server is used to store profile information of registered IoT services and virtual objects. 9 is a summary of a list of the main functions of the system of the present invention with a brief description.
  • VOM Virtual Objects Management
  • the virtual object and service management system of the IoT according to the present invention may be provided through an interface as illustrated in FIGS. 10 and 11, and the provided interface has two main tabs.
  • the first tab is used to display virtual object information of the registered IoT device in a table format as shown in FIG. 10.
  • the second tab is used to visually display IoT devices in the form of icons on a map at each location as shown in FIG. 11. In this case, the icons are selected for each device type so that the desired type of device can be visually easily identified on a specific area/region map.
  • the virtual object (VO) information before displaying the virtual object (VO) information, it is necessary to first connect to the database to read the virtual object information.
  • the virtual object view can be changed from the list to the map by clicking the corresponding tab.
  • the user can perform various types of management tasks.
  • a brief description of the management tasks related to virtual objects (VO) is as follows.
  • the first group box (top left) has a control device for performing configuration management related tasks. Through this, the user can display all virtual objects (VO) registered in the system.
  • VO virtual objects
  • VOM Virtual Objects Management
  • VOM Virtual Objects Management
  • VOs virtual objects
  • the user can view the virtual object VO according to the working status (in operation, not working, or both) through the failure management panel (group box on the upper right). If a response is not received from the physical device after a specified number of attempts, the virtual entity state is set to be disabled.
  • a list of non-functional devices can be easily generated and handed over to the system maintenance department to quickly find and fix problems. As an example, common reasons a registered device does not work include network connection problems and device power exhaustion.
  • the user can also view the selected operating state (busy, idle, or both). If a running application program is currently in use (the device status is set to busy), and a query is not received from the application within a specified time after that, the device status is set to idle.
  • the idle device list can easily create users while creating a new service to shorten the response time using the idle device. It also helps load balancing while limiting shared access to specific devices.
  • FIGS. 12 and 13 illustrate images of an interface of a service object management function in the virtual object and service management system of the IoT according to the present invention. Like the virtual object management function described above in FIGS. 10 and 11, it has two main tabs.
  • a first tab is used to display service object information of a composition service in a table format.
  • the second tab is used to visually display the registered service in the form of a connected icon by combining the constituent virtual objects (VO) through a map at each location as shown in FIG. 13.
  • the service object SO is composed of one or more virtual objects VO, and the icons of the corresponding virtual objects VO are connected to represent the service through a map.
  • the service object (SO) information Before displaying the service object (SO) information, it is necessary to first connect to the database and read the service object information. Furthermore, the service object view can be changed from the list to the map by clicking the corresponding tab.
  • SO service object
  • the first group box (top left) of the application interface shown in FIG. 12 has a control device for performing configuration management related tasks.
  • the user can view all or selected types of service objects (SOs) using this interface.
  • SOs service objects
  • service ID 1002 which is one of service configuration devices represented by two services, is an example of a typical alarm system for lighting control in a specific environment.
  • This alarm system is equipped with a light sensor as an input and a buzzer as an output device.
  • the service of the alarm system applying the service ID 1002 receives lighting data from the lighting sensor and turns on the buzzer when it exceeds 40.
  • Service ID 1003 is an example of a typical temperature control system for monitoring overheating in a specific environment.
  • This temperature control system provides a temperature sensor as an input and a motor (actuator) as an output device.
  • This service ID 1003 gets temperature data from the temperature sensor and turns on the sub motor when the value exceeds 50.
  • the serving motor can be for example any operating device. Air conditioners or fans should be turned on to control overheating.
  • the user can view the service object SO according to the work status (working, not working, or both) using the fault management panel (top right group box).
  • the service object (SO) state is set to not operate.
  • the user may view the service object SO with the selected operational state (busy, idle or both).
  • FIG. 14 is an image illustrating a mechanism for interaction with a virtual object-based physical device according to the present invention.
  • a user can select a device to perform an interactive task supported through configuration management. That is, as shown in FIG. 14, the user selects a desired device. After that, it checks the current operating condition of the device and displays an appropriate error message if it does not work. If the device is functioning properly, the application uses device profile information and builds and presents a user interface so that the user can perform supported interactive tasks. Thereafter, the user command is transmitted to the device using the device URI.
  • FIG. 14 The interaction as shown in FIG. 14 will be described with an example as shown in FIG. 15 as follows.
  • 15 shows a profile (XML view) of a general IP camera device.
  • the profile of FIG. 15 is a general description that the virtual object profile for an IoT device is shared by individual devices.
  • the Virtual Device Manager application a special tool that can create virtual object profiles for all IoT devices. End users can use this application to create and publish virtual entity profile information for each device.
  • the virtual object profile must include all properties and operations actually supported by the IoT device.
  • the virtual object profile presented in FIG. 15 contains 6 attributes, which are 6 different operations supported by each IP camera.
  • the user can expose all or part of each device's functions. Thus, two devices that are exactly the same can provide different functions, but in this case the corresponding virtual profile of each device will be different.
  • the user owner
  • the user can simply update the virtual entity profile for that device on the management server using the specified application. Any services that depend on or use the old virtual entity profile may also need to be modified.
  • the camera profile contains information on camera properties including URI and location information.
  • the supported operations for the specified camera are maintained.
  • a stream can be obtained from a camera for live view, and the stream can be stored in a video file for later search and analysis. It can also include various control actions to move the camera in four directions to obtain a desired field of view.
  • a frame queue is created to fix the frame of the streaming object.
  • the streaming object runs in a separate loop and gets continuous frames from the camera according to the frame rate stored in the frame queue.
  • the camera thread starts, fetches a frame from the queue and stores it. This order of operation is shown in FIG. 16. Once streaming starts, the user can execute a variety of supported commands to move the camera through the virtual object.
  • FIG. 17 shows a tool tip for displaying the name of the virtual object when a mouse is placed on the device icon when a list of devices registered in the service virtual object management system (SVOM) according to the present invention is displayed. Double-clicking the IP-camera icon (in the red box) opens a new pop-up window for interaction as shown in FIG. 17, and then, the Windows form control of the pop-up window is dynamically linked to the corresponding property of the selected virtual object VO.
  • the Afroge.NET library was used to obtain a live camera stream. Only the camera movement operation is executed, and the zoom button is deactivated because this camera VO profile (see Fig. 15) does not perform the zoom operation.
  • the system supports the dynamic creation of interactive interfaces in which elements of the interface are created during runtime. Create a button on the interface with clickable events for all attributes of the registered device virtual profile. Clicking the button triggers an event to execute the task on the IoT device. End users can test the properties contained in the virtual profile of the registered IoT device.
  • services of physical devices and registered devices constituting the Internet of Things are virtualized, the virtualized network is easily managed, and the control supported by the selected device is It is possible to establish an efficient management system to check operation, operation status and fault conditions.
  • IoT Internet of Things
  • the functional configuration and execution operation applied to the present invention may be represented by functional block configurations and various processing steps. These functional blocks may be implemented with various numbers of hardware or/and software configurations that perform specific functions.
  • the present invention provides integrated circuit configurations such as memory, processing, logic, and look-up tables, which can execute various functions by controlling one or more microprocessors or by other control devices. Can be adopted.
  • the present invention includes various algorithms implemented with a combination of data structures, processes, routines or other programming constructs, including C, C++ , Java, assembler, etc. may be implemented in a programming or scripting language. Functional aspects can be implemented with an algorithm running on one or more processors.
  • the present invention may employ conventional techniques for electronic environment setting, signal processing, and/or data processing. Terms such as “ ⁇ module”, “ ⁇ part”, “mechanism”, “element”, “means”, and “configuration” may be widely used, and are not limited to mechanical and physical configurations. The term may include a meaning of a series of routines of software in connection with a processor or the like.

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Abstract

La présente invention concerne un système et un procédé de gestion d'objets virtuels obtenus par virtualisation d'un capteur, d'un actionneur, d'un dispositif et d'une ressource de réseau de l'Internet des objets (IdO), ainsi que des objets de service générés à l'aide des objets virtuels. Selon la présente invention, un capteur physique, un actionneur, un dispositif et une ressource de réseau, qui constituent l'IdO, ainsi qu'un service d'un dispositif enregistré, sont virtualisés et des objets virtuels et des objets de service virtualisés sont générés, ce qui permet la gestion du capteur physique, de l'actionneur, du dispositif et de la ressource de réseau. En outre, la présente invention peut faciliter la configuration d'un objet de service généré à l'aide d'un objet virtuel et d'un travail de gestion d'anomalies et fournir un système de gestion pour inspecter un état de défaillance, un fonctionnement et une opération de commande prise en charge par une ressource ou par un dispositif sélectionné.
PCT/KR2020/007730 2019-06-13 2020-06-15 Système et procédé de gestion de ressources et de services de l'internet des objets et support d'enregistrement lisible par ordinateur dans lequel est enregistré un programme d'exécution dudit procédé WO2020251331A1 (fr)

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