Abstract: Provided is a method for preparing an oligomer including: supplying a monomer stream and a solvent stream to a reactor to perform an oligomerization reaction to prepare a reaction product; supplying a discharge stream from the reactor including the reaction product to a separation device and supplying a lower discharge stream from the separation device to a settling tank; adding an organic flocculant to the settling tank to settle and remove a polymer and supplying the lower discharge stream from the separation device from which the polymer is removed to a high boiling point separation column; and removing a high boiling point material from the lower portion in the high boiling point separation column and supplying an upper discharge stream including an oligomer to a solvent separation column.

Abstract: An electronic device and a method of controlling the same are provided. The electronic device includes a new memory configured to include a main memory region and a file system region and a processor configured to perform computing and perform checkpointing on the main memory region and the file system region depending on a predetermined condition, wherein the main memory region includes a checkpoint table to which information on a page in which data are changed is written, and the processor initializes the checkpoint table and sets an attribute of pages of the main memory region to read-only at the time of performing the checkpointing on the main memory region.