外文翻译消防系统运行可靠性的估计毕设论文.doc

外文文献：　 Estimates of the Operational Reliability of Fire Protection Systems For the past three years，the National Institute of Standards and Technology (NIST) has been working to develop a new encryption standard to keep government information secure．The organization is in the final stages of an open process of selecting one or more algorithms，or data-scrambling formulas，for the new Advanced Encryption Standard (AES) and plans to make adecision by late summer or early fall．The standard is slated to go into effect next year． INTRODUCTION Background Fire protection strategies are designed and installed to perform specific functions. For example, a fire sprinkler system is expected to control or extinguish fires: To accomplish this, the system sprinklers must open, and the required amount of water to achieve control or extinguishment must be delivered to the fire location. A fire detection system is intended to provide sufficient early warning of a fire to permit occupant notification and escape, and in some cases activation of other fire protection features (e.g., special extinguishing systems, smoke management systems). Both system activation (detection) and notification (alarm) must occur to achieve early warning. Construction compartmentation is generally designed to limit the extent of fire spread as well as to maintain the building’s structural integrity as well as tenability along escape routes for some specified period of time. In order to accomplish this, the construction features must be fire “rated” (based on standard tests) and the integrity of the features maintained. The reliability of individual fire protection strategies such as detection, automatic suppression, and construction compartmentation is important input to detailed engineering analyses associated with performance based design. In the context of safety systems, there are several elements of reliability, including both operational andperfornzance reliability. Operational reliabilit