Advanced Materials Research Vols. 926-930

Abstract: Currently, the research of marine natural gas engine is rare, while the combustion and emission characteristics of natural gas engine are affected greatly by the diesel ignition. This paper built a finite volume combustion model of diesel ignited natural gas engine by AVL FIRE software, and compared experimental data to prove the accuracy of the model, and numerical simulation of the combustion process that the diesel ignited natural gas was carried, analyzed the combustion and emission characteristics of natural gas engines, provided a theoretical basis for the further optimize and design of marine natural gas engine.

Abstract: The efficiency of path clearance optimization method is low and the corresponding path may collide with obstacles when applying it to the original path planned by RRTConCon algorithm. The paper analyzed the original path clearance and corridor width and chose proper moving distance towards the medial axis and binary search step. The paper also analyzed the collision reason and proposed an method to deal with it. The method moves collision configurations to the free space and retracts them to the medial axis, then adds them to the retracted path. The experimental results showed the measures are effective to improve efficiency and could deal with collision problem.

Abstract: We simulate flow shop scheduling and routing with automated guided vehicle (AGV for short) in an assembly plant, aim at obtaining the optimal AGV configuration. We first provide the requirement of assembly plant, and describe AGV configuration problem in real-world example. And then we build AGV simulation with Plant Simulation, and provide our problem-solving strategies. In the simulation process, we try to determine the number of AGV and maximize the utilization to reduce waiting time. We ran the simulation with different parameters, and get the cost time and utilization rate of AGVs. The vehicle utilization results of different number of AGVs verified our configuration.

Abstract: In the process of vehicle design, the applications of large numbers of rubber bushing have great influence on adjusting and improving vehicle subjective performance and dynamic quality. In order to perform the characteristics of the rubber bushing more accurate, three models were selected as the object to study, such as Kelvin-Voigt model, Berg model and ASCL model proposed by the state key laboratory of automobile dynamic simulation. Static and dynamic forces were loaded to obtain experimental data. By analyzing the complex stiffness, the static and dynamic parameters of the three models are identified using the least square method. Finally, an analysis was carried out to compare the bearing characteristics of the three rubber bushing models.

Abstract: With the robustness of a single color which is not high in standard particle filter tracking, a fusion of color and gradient particle filter algorithm is proposed. By the advantages of color described the target ’global and gradients described the shape of structure, they are weighted fusion to form a new integrated histogram and applied to the particle filter framework. The experimental results show that compared with the traditional particle filter algorithm, the text of the algorithm can achieve relatively reliable target tracking under complicated background and illumination changes, with better robustness and reliability.

Abstract: Peak feature extraction is an important section in SAR automatic target recognition (ATR). A novel method for peak feature extracting has been proposed, and an extended peak characteristic is given. Directly dealing with the peak model, the feature parameters is extracted by means of weighted least-square fitting using neighborhood information; a detailed error analysis for feature parameters extraction imposed by noise has also been carried out, and an analytic variance expression is given. In the end, some experimentation are done using simulated data, domestic real airborne SAR data and MSTAR data, and the results verify the validity and accuracy of the method.

Abstract: It is very simple to calculate the definite integral and some special curvilinearintegral. Based on this method, the author put forward the concept of primary functions on a curve and sets up a new method on curvilinear integral with primary function. Finally the author gave a generalization of finite increment theorem in higher dimensional space.

Abstract: The coffee flavor compounds acquire a significant place in the improving the flavor of cigarette. In the present paper, the gene expression programming (GEP) is used to develop quantitative relationships between the retention time (TR) and four molecular descriptors of 52 compounds. The model of GEP gives good statistical result. This method can be used to set up the good regression model.

Abstract: The main purpose of a computer intrusion detection system is to accurately distinguish between self and non-self. A novel intrusion detection model based on ARTIS model is proposed by introducing the Red Flower and Green Leaf concepts, and by coordinated use of RF variable length and GL fixed length detectors. Intrusion detection methods are optimized to ensure the quick detection of abnormal behaviors making the model more suitable for real-time intrusion detection and more accurately to distinguish between self-and non-self.

Abstract: Image matting is a technology to extract interested prospects or subtract the background from videos or images. It is more and more widely used in television and movie production, virtual studio, network education, video monitoring and many other fields. Mainly aims at the pure-colored background of virtual studio, this paper proposed a real-time video matting algorithm based on chroma key. The algorithm used morphology operations to process the edge of matting images effectively, practiced in situational teaching system. It satisfies the real-time requirement on the premise of quality assurance. Finally, this paper considers some existing algorithm problems and puts forward feasible improvement methods.