Abstract: A server according to an embodiment includes a processor configured to receive a friend add request for a target account from a user terminal accessed with a user account; based on one of the user account and the target account being a protected account, transmit an approval request for the friend add request to a protector account connected to the protected account; and based on receiving a reply to the approval request from the protector terminal, add the target account to a friend list of the user account.

Abstract: An air conditioner intakes indoor air and outdoor air, blows it through a heat exchanger, then supplies the conditioned air to an indoor space. In the heat exchanger, water cools the air. A remote refrigeration circuit, also known as a chiller, cools the water. A controller controls the chilled water to stay within a temperature range. When the chilled water exceeds the temperature range, the air conditioning fan is decelerated, thus reducing the amount of heat that the water absorbs from the air. When the desired indoor temperature is less than the actual indoor temperature, then the fan is returned to its maximum velocity.

Abstract: An air conditioner according to the present invention comprises an air handling unit comprising a fan for supplying the air mixed the indoor air with the outdoor air to the indoor space and a heat exchanger for exchanging the mixed air blowing by the fan with the chilled water and a temperature sensor for sensing temperature, and a chiller which includes a compressor, a condenser, an expansion device and an evaporator and supplies the chilled water from the evaporator to the heat exchanger through a water pipe connecting the evaporator with the heat exchanger, wherein the chiller communicates with the air handling unit and sets a chilled water set temperature of the chilled water supplied from the evaporator to the heat exchanger according to the result sensed by the temperature sensor and changes the driving capacity of the compressor according the chilled water set temperature.

Abstract: An air conditioner according to the present comprises a plurality of chillers which include a compressor, a condenser, a expansion device and an evaporator and supply cold water through water pipes connected to the evaporator in parallel. An operating chiller of the plurality of chillers sets a cold water set temperature of the operating chiller according to pressure difference between high pressure part and low pressure part and controls the compressor capacity according to the cold water set temperature and transmits an operation order to a chiller not operating until the present if the pressure difference is more than the set pressure for the set time and at least one of the chillers is not operating. Thus, it is possible to perform an efficient operation according to load and to minimized power consumption.

Abstract: An open distributed processing structured robot control software architecture is enclosed, which makes it possible to manufacture a user-oriented robot through combination of independent heterogeneous functional modules. The invention involves an open software framework for integrated operation and production of distributed software of the modules, and an autonomous robot control architecture suitable for distributed environments. The software framework indicates underlying software components for robot control and service creation. The invention makes it possible to mass-produce autonomous robots in units of interoperable functional modules. It is also possible to meet various demands of consumers, achieve specialization, and accelerate technology development since the development procedures are specialized in an independent manner and are suitable for manufacturing a wide variety of robot products in small quantities.

Abstract: An open distributed processing structured robot control software architecture is enclosed, which makes it possible to manufacture a user-oriented robot through combination of independent heterogeneous functional modules. The invention involves an open software framework for integrated operation and production of distributed software of the modules, and an autonomous robot control architecture suitable for distributed environments. The software framework indicates underlying software components for robot control and service creation. The invention makes it possible to mass-produce autonomous robots in units of interoperable functional modules. It is also possible to meet various demands of consumers, achieve specialization, and accelerate technology development since the development procedures are specialized in an independent manner and are suitable for manufacturing a wide variety of robot products in small quantities.

Abstract: A distributed software integration service method for open robot development based on the Internet is disclosed, which makes it possible to manufacture a user-oriented robot through combination of independent heterogeneous modules. The invention involves a robot development procedure and a new robot development environment/tool for providing user-oriented services and for integrated operating of distributed software installed in the modules over the Internet. The robot development procedure includes three independent specialized development stages, i.e., a platform development stage, a module development stage, and a user-oriented robot development/user service development stage. The invention makes it possible to mass-produce autonomous robots in units of interoperable functional modules.