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During an emergency in a building complex, an effective evacuation is essential to avoid crowd disasters. This article presents a route guiding that minimize the evacuation time during the evacuating of pedestrians from a building.
We propose a kinematic control law that solves the problem of stabilizing the attitude of a fully actuated rigid body to a desired rest attitude. The control law is designed on the special orthogonal group SO(3), thereby avoiding complications due to the representational singularities of local parametrizations and the unwinding phenomenon associated with global many-to-one parametrizations. We prove...
The pressure distribution within pneumatic strip shape measuring roll directly affected its specifications. It presented a finite difference equation of the air film regiona film corresponding to an orifice. An analysis and simulation on film pressure field and the bearing capacity were complted with the principle of Reynolds equation. The results showed that the pressure in measuring holes was smooth;...
Sensor networks can monitor interesting targets and fields. Most existing studies assume a constant utility (i.e. measurement accuracy) model within the sensing region. Yet the utility decreases in some scenarios as the distance becomes large. This paper considers the provisioned sensor placement problem where individual targets require different levels of utilities. The problem formulation is proved...
HTTP streaming recently emerges on Internet, and is conveniently accessed from multiple kinds of platforms. It lowers complexity for implementing media streaming applications by relying on pervasively adopted web servers. The media content is divided into segments of the fixed time intervals before being independently requested by clients. This paper studies choices of these fixed time intervals,...
This paper considers the stabilization of random Boolean networks. We first give a survey on the semi-tensor product approach to Boolean (control) networks, which is a new technique developed by us. Particularly, the stability and stabilization of Boolean (control) networks are reviewed. Then, under the same framework, the topological structure of the random Boolean networks is investigated and revealed...
Recently, Liu et al. (Liu YC, Wen HA, Lin CL, Hwang T. Proxy-protected signature secure against the undelegated proxy signature attack. Computers and Electrical Engineering 2007; 33: 177-85) proposed one proxy signature scheme that is the improvement of Zhou et al.'s (Zhou Y, Cao Z, Lu R. Provably secure proxy-protected signature schemes based on factoring. Appl Math Comput2005; 164(1):83-98) proxy...
Recently, Hu-Bin and Jin Chenhui proposed anew strong proxy signature scheme based on elliptic curve crypto system. They claimed that it is secure and efficient. However, this paper shows that the proposed scheme is not correct and there are several mistakes in their scheme. As an improvement, this paper presents a novel strong proxy signature scheme which corrects the weakness of Hu-Bin and Jin Chenhui's...
In order to have a self-organized multi-agent system exhibit some expected collective behavior, it is necessary that some agents (called leaders) are informed about the expected behavior and able to intervene. Then a fundamental question is: how many such leaders are needed? Naturally the answer depends on the model used. In this paper the model proposed by Vicsek et al. is used for the analysis....
We examine the leader-to-follower ratio needed to maintain connectivity in a leader-follower multi-agent network with proximity based communication topology. The paper extends the one-dimensional results of [2] to the two dimensional case. In the scenario we consider, only the leaders are aware of the global mission, which is to converge to a known destination point. Thus, the objective of the leaders...
For linear systems, it is known that there exists a state observer if and only if the system is detectable, or in other words, asymptotically stabilizable by output injection. In this paper, it is shown that for a nonlinear system, the stabilizability by output injection is neither necessary nor sufficient for the existence of an observer.
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