Network always suffers from the traffic anomaly such as router rate change, device restart or the worm attack. The early detection of unusual anomaly in the network is a key to fast recover and avoidance of future serious problem to provide a stable network transmission. In this paper we present a statistical approach to analysis the distribution of network… (More)
The gear box fault occur can lead to the fatal breakdown of mechanical system. Back propagation neural network (BPNN) have been proved to be of widespread utility for identifying and classifying gear box faults to prevent serious damage in a mechanical system. Some researchers have used particle swarm optimization (PSO) to train BPNN. However, because the… (More)
As the viewing range of the existing fire detection devices is normally short, and directional detection of the flame can not be achieved, it can not be used in many cases. An optical design and implementation based on flame pyroelectric sensor are present in this paper. Two types of directional flame detection are provided. One is to achieve plane-type… (More)
In the field of modern national defense and civilian technology, we often need to precisely adjust a bearing platform. The platform with certain equipment to the horizontal position improves the system performance. Short time, high speed, high precision and well stability is required in the leveling system. However, the leveling system is a nonlinear… (More)
Findings by duration dependence test indicate that there are significant bubbles in market response to merger & acquisition. This paper compares the different responses caused by the same event between Shenzhen security market and Shanghai security market.