Abstract: It is presented a method performed for controlling access to a physical space. The method is performed in an access control device and comprises the steps of: communicating with an electronic key to authenticate the electronic key; performing a lookup of an access right using an identity of the electronic key in a credential cache when the access control device is unable to communicate with an access control server; and sending an unlock signal when the access right indicates that the electronic key should be granted access; retrieving, from the access control server, an access right indicating whether the electronic key should have access or not, when the access control device is able to communicate with the access control server; and updating the credential cache dential cache with the access right retrieved from the access control server.

Abstract: It is presented a method performed for controlling access to a physical space. The method is performed in an access control device and comprises the steps of: communicating with an electronic key to authenticate the electronic key; performing a lookup of an access right using an identity of the electronic key in a credential cache when the access control device is unable to communicate with an access control server; and sending an unlock signal when the access right indicates that the electronic key should be granted access; retrieving, from the access control server, an access right indicating whether the electronic key should have access or not, when the access control device is able to communicate with the access control server; and updating the credential cache dential cache with the access right retrieved from the access control server.

Abstract: Drilling assemblies, systems and methods enable a wellbore to be drilled and lined with a slotted liner. A drilling system includes a liner assembly with a drill string in a bore thereof. The drill string and the liner assembly can be selectively coupled together to restrict relative motion between the liner assembly and the drill string. The liner assembly includes a slotted liner portion through which fluid may flow. As the drilling system is used to drill a wellbore, the liner assembly is simultaneously positioned within the wellbore. Once the wellbore is drilled to a desired depth, the drill string can be disengaged from the liner assembly and retrieved from the well. Production fluids such as oil and gas may then be transferred uphole through the liner assembly.