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The grey theory mainly works on systems analysis with poor, incomplete or uncertain messages. The popular grey model, GM(1,1) is efficient for long-term port throughput forecasting. However, it is imperfect when the throughput increases in the curve with S type or the increment of throughput is in the saturation stage. In this case, the throughput(More)
The obstacles measurement and recognition from the complex background is the first step for a power transmission line inspection robot to negotiate obstacles autonomously with high reliability. This paper introduces the research and application situations of the inspection robot and analyses the features of the typical obstacles in the real power line. The(More)
With the widespread utilization of mega- containerships, the economies of scale becomes more and more obviously. In order to get more benefits, a hub-and-spoke model for the container transportation network is provided here. Then the chaos optimization algorithm (COA) is applied to solve the complicated network optimization problem. Chaos has many good(More)
This paper introduces the research and application situations of the power transmission line inspection robot. It describes the architecture of two–arm rotary mechanism robot and the configuration of control system. The emphasis of this paper is placed on the algorithm of object recognition for those structure-restrained obstacles such as suspending(More)
The instrumental variable method consistently estimates the effect of a treatment when there is unmeasured confounding and a valid instrumental variable. A valid instrumental variable is a variable that is independent of unmeasured confounders and affects the treatment but does not have a direct effect on the outcome beyond its effect on the treatment. Two(More)
The paper firstly analyzed the navigation system, including the vessels, single-fairway, berths, and anchorage et al. Then, a port navigation operation simulation model was established by Arena considering the characteristics of vessel navigation, the production and operation of coastal bulk cargo port area. Besides, in order to study the fairway capacity,(More)