Color conceptualization aims to propagate "color concepts" from a library of natural color images to the input image by changing the main color. However, the existing method may lead to spatial discontinuities in images because of the absence of a spatial consistency constraint. In this paper, to solve this problem, we present a novel method to force neighboring pixels with similar intensities to have similar color. Using this constraint, the color conceptualization is formalized as an optimization problem with a quadratic cost function. Moreover, we further expand two-dimensional (still image) color conceptualization to three-dimensional (video), and use the information of neighboring pixels in both space and time to improve the consistency between neighboring frames. The performance of our proposed method is demonstrated for a variety of images and video sequences.

With consideration of the actual requirement of fault knowledge management in current aviation maintenance, ontology-based knowledge representation method of aircraft fault is studied. Knowledge sources of aircraft fault ontology are analyzed based on ontology modeling primitives. Ontology construction method of aircraft fault knowledge is proposed learning from software engineering and the essence of the existing ontology construction methodology. On the basis of the above study, aircraft fault ontology which is consist of Fault Core sub-ontology, Product domain sub-ontology, Case domain sub-ontology, and Diagnosis domain sub-ontology is build, and it represents aircraft fault knowledge completely and consistently, and also lays the foundation for knowledge management of aircraft fault.

In order to detect and diagnose abnormal conditions of marine diesel engine and ensure its normal functioning, the present study adopts the BP neural network and related algorithms to determine the remote fault diagnosis process. Taking the design of exhaust gas temperature remote monitoring sub-system as an example, MATLAB programming was used for data simulation and verification. The applying of the system on board a real ship shows that it has a high working rate, a reliable and safe storage mode and a self- adaptive process.

The inertial force and torque produced by the crank-rod mechanism is an important factor of vibration in single-cylinder internal combustion engine. Based on MATLAB software, the analysis model of crank-connecting rod-piston mechanism of S195 diesel engine is established, and the dynamic characteristic parameters of the main parts can be obtained. The results showed that the simulation analysis can get the kinematic and dynamic data of the mechanism conveniently and accurately, which provides a feasible advanced method for the design and development of diesel engine.

The reliability of the engine room is an important guarantee for the safety of ship. This article uses the theory of Man-machine environment Systems Engineering, combined with the engine room safety management practice, comprehensively analyze the characteristics of man, machine and environment and their impact on engine room safety, Finally, it gives some engine room safety management measures which are based on the theory of Man-machine environment Systems Engineering.