Papers by Keyword: Critical Number

Abstract: Autonomous Security robots (ASR) can be used to provide security where and when it is too hazardous to the human security guards. The paper is suggesting the introduction/incorporation of ASR into the Niger Delta security system (NDSS). Critical points (where ASR are needed) within the zones are identified based on the past security records. These records served as baseline data which regression lines are generated and produced into some future dates. How many ASR are required at a particular time in the system Is the number feasible What are the likely obstructions of the project These are some fundamental questions attempted in the paper to evolve a critical and optimal location for every security robot deployed to serve in the system. The paper is proposing ASR that will play preventive roles.

Abstract: Abstract. Lateral pedestrian loads and flexible footbridge form a dynamic interaction system, which has a special lock-in phenomenon and results the instability of the dynamic system when the pedestrian number reaches certain critical value. A simplified theoretical equation to model the dynamic interaction system and to estimate critical pedestrian number is proposed. The lateral pedestrian loads resulted by structural vibration is first analyzed from a view point of social force model. And then, combined with structural vibration equation, the control differential equation for describing the dynamic interaction system is proposed. The control equation explains why the lock-in phenomenon is resulted and how to estimate the critical pedestrian number. Two typical footbridges are investigated and the results show that critical pedestrian number estimated by the model is more close to those by field observation.