Abstract: A positive electrode active material, a method of preparing the same, and a positive electrode and lithium secondary battery including the same are disclosed herein. In some embodiments, a positive electrode active material includes a lithium transition metal oxide which contains 60 mol % or more of nickel based on a total number of moles of transition metals excluding lithium in the lithium transition metal oxide, wherein the oxide is in a form of a secondary particle which is an aggregate of primary particles, wherein the lithium transition metal oxide satisfies Equation 1: 1 ? x y ? 20 Wherein x is a minimum area of a rectangle including all pores having an area greater than 0.002 ?m2 among closed pores distributed in the secondary particle, and y is a total sum of areas of the pores having an area greater than 0.002 ?m2 among the closed pores distributed in the secondary particle.

Abstract: Disclosed is a method for operating and participating in a voice chat room subordinate to a message chat room is disclosed. The method for operating a voice chat room subordinate to a message chat room includes: managing, by a server, messages transmitted and received through the message chat room in which a first user and a second user participate; receiving, by the server, a request for creation of the voice chat room subordinate to the message chat room from the first user; creating, by the server, the voice chat room in response to the received request for creation of the voice chat room; providing, by the server, information that the voice chat room is being operated to the second user through the message chat room; providing, by the server, information that the voice chat room is being operated to the second user through a message chat room list.

Abstract: A method and apparatus for a remittance service are disclosed. An operation method of a server providing a remittance service includes receiving, from a remitter participating in an anonymous chatroom by using a first temporary profile, a request for a remittance to a second temporary profile participating in the anonymous chatroom, verifying a remittance qualification of an account of the remitter, generating remittance transaction information for remitting an amount corresponding to the remittance request to an account of a remittee corresponding to the second temporary profile, and transmitting, to the account of the remittee a remittance notification including information on the first temporary profile as remitter information.

Abstract: A messenger application for a second account related to at least one account in an instant messaging service receives, from a server, a list of at least one first account for which a video is registered and recommends a first account using a list view that shows the list of the at least one first account distinguished from a list of the at least one account.

Abstract: A method and apparatus for operating an instant messaging server are disclosed. The method for operating an instant messaging server according to an example embodiment includes managing a message sent and received through a first chat room of a messenger application, managing a message sent and received through a second chat room of a 3rd party application receiving support a chat function through the instant messaging server, identifying a user account of an instant messaging service (IMS) linked with a user account of the 3rd party service participating in the second chat room, and providing, based on the identified user account of the IMS, the second chat room of the 3rd party application to the messenger application.

Abstract: A method and apparatus for operating an instant messaging server are disclosed. The method for operating an instant messaging server according to an example embodiment includes managing a message sent and received through a first chat room of a messenger application, managing a message sent and received through a second chat room of a 3rd party application receiving support a chat function through the instant messaging server, identifying a user account of an instant messaging service (IMS) linked with a user account of the 3rd party service participating in the second chat room, and providing, based on the identified user account of the IMS, the second chat room of the 3rd party application to the messenger application.

Abstract: A messenger application for a second account related to at least one account in an instant messaging service receives, from a server, a list of at least one first account for which a video is registered and recommends a first account using a list view that shows the list of the at least one first account distinguished from a list of the at least one account.