Abstract: A cushion for a chair including a seat member and a back-supporting member, wherein the seat member includes two ischium-facing portions, a surface of each ischium-facing portion abutting an ischium of the user and having a specific three-dimensional curved surface; and the back-supporting member includes an ilium upper border-facing portion and a lower ribs-facing portion, a surface of the ilium upper border-facing portion abutting an ilium of the user and being entirely concavely curved in a transverse cross section along a left-right direction, a surface of the lower ribs-facing portion abutting the lower ribs of the user and being entirely concavely curved in the transverse cross section along the left-right direction, and a portion of the back-supporting member upper than the lower ribs-facing portion having a specific three-dimensional curved surface.

Abstract: A cushion for a chair including a seat member and a back-supporting member, wherein the seat member includes two ischium-facing portions, a surface of each ischium-facing portion abutting an ischium of the user and having a specific three-dimensional curved surface; and the back-supporting member includes an ilium upper border-facing portion and a lower ribs-facing portion, a surface of the ilium upper border-facing portion abutting an ilium of the user and being entirely concavely curved in a transverse cross section along a left-right direction, a surface of the lower ribs-facing portion abutting the lower ribs of the user and being entirely concavely curved in the transverse cross section along the left-right direction, and a portion of the back-supporting member upper than the lower ribs-facing portion having a specific three-dimensional curved surface.

Abstract: A system for analyzing the performance of a network includes a data collection agent that collects performance data including first and second sets of measurements of a single network parameter. First and second variance statistics are calculated. A user is alerted about potential network performance problems based on whether a predetermined relationship exists between the variance statistics. The user may be notified by sending an e-mail to the user; and/or sending a fax to the user; and/or initiating a phone call to the user. The user may be alerted by a message to a PDA or a cellular telephone.