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Fault isolation is an essential step in multivariate statistical process monitoring, which discovers the cause of the detected fault. The common adopted techniques for fault isolation, such as contribution plots, reconstruction analysis, branch and bound, etc., often suffer from the problems of the smearing effect, insufficient historical fault data, and heavy computational burden. In this paper,...
Software Defined Networking is a novel network architecture, which separates data and control plane by OpenFlow. The feature of centralized control to acquire and allocate of global network resource. So, the link load-balancing of SDN is not as difficult as the traditional network. This paper proposes a link load-balancing algorithm based on Ant Colony Optimization(LLBACO). The algorithm uses the...
Floods are one of the most devastating natural hazards around the world, and flash floods are extremely dangerous to property and human lives. This study reviews the current flash flood forecasting in China and proposes a new methodology to develop a flash flood potential index (FFPI) based on GIS to further improve China's flash flood guidance system and national weather forecasting services. We...
Internet of Things (IoT), which will create a huge network of billions or trillions of “Things” communicating with one another, are facing many technical and application challenges. This paper introduces the status of IoT development in China, including policies, R&D plans, applications, and standardization. With China’s perspective, this paper depicts such challenges on technologies, applications,...
Nowadays bad adaptive performance of network intrusion prevention system (IPS) becomes the bottleneck of its development in face of complex and fickle attacks. The idea of cognitive network intrusion prevention is creatively put forward to solve the problem in this paper. Three basic problems of the cognitive IPS, knowledge representation, environmental perception and self-learning, are discussed...
Aim at performance downgrade of loitering detection in the case of motion target being motionless of short duration or multiple targets having crisscross motion, furthermore, loitering detection pays more attention to trajectory of motion target than itself, so this paper proposed a method of video loitering detection based on dynamic programming. First, we extract characteristic points from every...
This paper presented the design method of a digital-controlled variable voltage source with current monitor function. The hardware of system mainly consists of FPGA, DAC, programmable gain amplifier, current sensing circuit and comparator. By using high-speed analog comparator to convert over-current time to length of digital pulse, the FPGA could monitor the amplitude of current dynamically. In aspect...
In this paper, we introduce DirectDraw technique, MPEG??|4 video coding technique, and IPv4/IPv6 dual-stack VIDS (Video Intelligent Diagnosis System). The author expounds the design of the monitoring center in VIDS system. In order to solve the instantaneity and fluency problem of video display, we present a method of regulation video-frequency-display rate according to the size of video data quantity...
In recent years the satellite monitoring capabilities in particular to derive maps of aerosol optical depth (AOD) have increased tremendously. There are many aerosol retrieval algorithms for different satellites and sensors. In 2005, a new algorithm for AOD retrieval by synergetic use of of Terra and Aqua MODIS data (SYNTAM) was proposed by Tang et al. With this algorithm, surface reflectance and...
The coal mine laneway is a kind of limited and changeable space with bend and embranchment in a longitudinal way. Its complicate environmental condition influences the connectivity, coverage, the packet loss rate and energy consumption of the wireless sensor networks. To construct the real system of wireless sensor networks for mine working environment, this paper proposes a clustering-based chain-type...
On Oct. 28th, 2009, a heavy fog hit East China. From the MODIS RGB composite image, it can be seen clearly that, much of land of the area (110°-123°E, 30°-42°N) was covered by the heavy fog or cloud. Using MODIS multi-satellite algorithm for aerosol optical depth (AOD) retrieval, we get the AOD Map at 470, 550 and 660 nm from MODIS data at 1km × 1km resolution. By Validating with the AERONET data,...
This paper describes a case study of satellite data integrated with HYSPLIT forward-trajectory model to forecast air quality in regional scale. During mid-October 2009, a severe haze event occurs in eastern China. With the help of HYSPLIT Trajectory Model, a 24-hr, 48-hr and 72-hr forward trajectory from three regions with high aerosol optical depth (AOD) values were created. Forward trajectories...
When the system for monitoring communications satellite temporary business has been used in practice, due to the increase of the temporary business and the change of the data transfer require, many new problems has been risen. So monitoring efficiency, system independence, flexibility, commercial use and cost must be considered in system design. According to actual needs the system for monitoring...
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