Applied Mechanics and Materials Vols. 241-244

Abstract: In order to monitor and control the parameters of AC servo driver, and also operate the condition of AC servo motor from upper-computer in real-time, a modularized architecture of software of upper-computer was presented. This software with well-designed human-computer interface and powerful function was developed by Visual C++ 6.0 and designed by the principle of object-oriented according to the requirements of users. An experimental platform was set up to test the software functions. The experimental results have proven that the developed software can realize the communication between the upper-computer and AC servo driver; it can also monitor and control parameters and including operation status of the AC servo motor. Meantime, the upper-computer software can read or write 149 sets of configuration parameters. These results indicate the developed software is convenient for users to control the AC servo driver.

Abstract: Land subsidence has become a major geological hazard in Shanghai . Based on the view of system theory, The paper sets a numerical model of land subsidence, the results of model simulation are as follows: 1) the speed of land subsidence will be 8.81mm/a in Shanghai in the next 10 years if it can maintain present trends of load increase and groundwater mining; 2) Since 1998, we adjust the ratio of groundwater extraction and filling to 1:1, the accumulated quantity of land subsidence will rebound to 30mm in 2017, from 2018, it will continue to drop. However, the overall future land subsidence will keep the trend of slow growth; 3) Double the exploitation capacity in1998, the speed of land subsidence will be 41mm/a in 2020, the accumulative quantity of land subsidence will be close to 1m. According to the average high tide level (5.15m) in the Huangpu River in 2000-2008, the actual average high tide level of the Huangpu River will reach about 6m and exceed the orange warning response against flood and typhoon in Shanghai. If superimposing sea level rise and strong typhoon disasters, it will face with more serious flood risk.

Abstract: In this paper, based on the preconditioners presented by Wang [On hybrid preconditioning methods for large sparse saddle-point problems, Linear Algebra Appl., 434 (2011) 2353-2366], we introduce and study the block symmetric SOR (BSSOR) and the modified block symmetric SOR (MBSSOR) preconditioners for the block traingular product approximation to a 2-by-2 block matrix and these preconditioners are the generalization of BSGS and MBSGS preconditioners presented by Wang. Moreover, we analyse the properties of the corresponding preconditioned matrices.

Abstract: In traditional, software implementation for requirement changes brings big effort on legacy architecture, and may decrease the readability, increase the possibility of error, and hard to maintain for software. So, software refactoring needs to be involved to solve the issue. A successful refactoring practice is presented in this paper to solve above issue met in a control application system supporting different boot process. It has been proved that the flexibility and extendibility are improved greatly than the original architecture. Furthermore, by encapsulating more details in the class and specified function, it reduces the complexity of interface. As a result, the risk of interface error is decreased, and the software quality is improved accordingly.

Abstract: With the rapid development of Internet technology, network transmission spreads every corner of the world. Network brings convenience for the people, but at the same time, it also brings some security risks, such as the illegal diffusion of pornographic images on Internet. It can cause a series of social problems and legal issues, especially do great harm to the young people. This paper is to discuss the research and realization of the pornographic image information detection system.

Abstract: As a visual form of expression, video has been favoured by more and more viewers. But in actual applications, various operations have different requirements for videos, which necessitate the video converter. This paper proposes a queuing mechanism by using the FFmpeg platform to achieve asynchronous video conversion based on the Linux OS environment. The test results show that this system realizes the asynchronous conversion of video contents by calling inotify and FFmpeg.

Abstract: Ontology reusing has been extensively researched. Ontology connection is one of the ways which can reuse ontology that has been studied lately. Ε-connections and bridge rules are two ways of connecting ontologies. Based on these two methods, and using the ontology editor tool SWOOP, the link properties of the classes from different ontologies can be defined. Using these link properties, the multiple ontologies we are connecting can be reused effectively.

Abstract: At present, the automatic fire alarm systems on sale were produced by different factories, which resulted in the information not being shared mutually. Furthermore, it was difficult to connect the different fire auto-alarm systems to the same network. They couldn't communicate automatically with the city fire-fight commanding center in time. We designed interface module of automatic fire alarm controller network and interface module of data center network. By using the existing net of PSTN and internet, it could transmit the breakdown information and a fire information of the automatic fire alarm systems to the fire-fight commanding center, the long-range diagnose, the real-time monitor of a fire and the long-range control in the city fire auto-alarm system was realized.

Abstract: The automatic fire alarm systems currently in the market came from different manufacturers, but they were unable to share information each other, difficult to form the same network and exist independently, and unable to automatically communicate with city fire control command center in time. Therefore，it caused delay of the fire alarm report. As the result, we proposed the idea of combining the City Fire Safety Digital monitoring system with Internet, analyzed its composition principle. Appropriate hardware and software were designed, and successfully developed.

Abstract: Analyzing the existing problems of traditional management model of mine-map and the development significance of mine-map management information system on the basis of B/S model, combining with the actual situation of mining enterprises, this paper designs mine-map management information system on the basis of B/S model using ASP technology, backend database system using Microsoft SQL Server 2000 simplified enterprise edition. The system mainly consists of four main modules such as interface module, system setting module, task assigned module, maps consulting modules, the task of each module is definitude, the function is independent. Field application shows that the system realizes line production of mine-map management, such as submission, examination and approval, storage and consulting etc, enhances the efficiency of examination and approval and management for mine-map.