Supervised Method for Congestion Detection at Entry and Exit Corridors of Public Places

Continuous monitoring and automatic detection of crowd activities is extremely helpful for management at public places to avoid any possible disaster. Analysis of crowded scene is a critical task as it typically involves poor resolution of objects, occlusions and complex dynamics. In this paper, we propose a novel, systematic and generalized method based on global motion analysis of people to detect Congestion situation in crowded scenes at entry/exit corridors. Our approach is tested on video footages acquired from surveillance cameras installed at exit corridors of public places. The results show the expediency of our approach.

Effect of Polyester Mooring Stiffness on SCR Design for Semi Applications

Polyester rope mooring system has been widely accepted as a reliable and cost effective choice for deepwater mobile offshore drilling and floating production units in recent years. Polyester rope is made of a visco-elastic material and its stiffness is affected by mean tension, tension amplitude, loading period, and loading history. This creates complexity and uncertainty in the design of hull, mooring and riser systems. This paper summarizes the results of a JIP study investigating the effect of polyester rope stiffness on the SCR design of a semi-submersible FPU at two water depths in the Gulf of Mexico (GoM). A two-slope static-dynamic stiffness model proposed in the recently issued ABS “Guidance Notes on The Application of Fiber Rope for Offshore Mooring”[1] is used in the global motion analysis to provide input for the riser analysis. Parametric studies of SCR extreme analysis, wave fatigue analysis, and VIM fatigue analysis have been performed. Based on the results, recommendations on the impact of rope stiffness to the riser design are presented.

The Transient Effect of Tendon Disconnection on the Global Motion of ETLP

This paper deals with a numerical study of the transient effect of tendon disconnection on global performance of ETLP for harsh environmental condition in GoM (Gulf of Mexico). Twelve tendons support the platform with twelve production TTRs and one drilling riser attached by hydro-pneumatic tensioner. Charm3D, a program for global motion analysis of multiple floating hulls coupled with risers/mooring lines, is made to be capable of modeling the tendon disconnection at both top and bottom connection. The study includes the break due to high tension at the top and the unlatch due to negative tension at the bottom. A sudden disconnection of one or more tendons causes the unbalance of force and moment of the total system, only to cause the transient motion and tension as well as the mean offset. The breakage and the unlatch also make the different effects. The transient responses and the mean offsets are compared and discussed in the viewpoint of the safety of the system.