The projection system includes a plurality of projection apparatus including a frame. Such evaluation may be performed by computing a minute ventilation response slope, defined as the ratio of an incremental change in minute ventilation to an incremental change in measured activity level. Proteins where each of the n-X\u2014 moieties shares sequence identity to each other \u2014X\u2014 moiety, the protein is a \u2018tandem protein\u2019. An input stream processing unit outputs the stream data received by the first input unit to a first path corresponding to the first decryption key, and outputs the stream data received by the second input unit to a second path corresponding to the second decryption key. The connector establishes communication with the billing system and downloads the information to the billing system in response to a message indicating that the data storage system received the event information. An inner wall of the trench structure may include a convex region interposed between the upper trench region and the buffer trench region and another convex region interposed between the buffer trench region and the lower trench region.