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High-level spacecraft surface charging, which is frequently observed in the auroral region, may lead to electrostatic discharges and result in significant damage to the satellite. In this paper, we present preliminary results on the relationship between low earth orbit surface-charging events and the geomagnetic activity indices. The surface-charging events in the auroral regions are identified and...
To address the problem of the decision-making for coordinated multi-target attack of multi-aircraft in the uncertain communication environment, a new algorithm using Science of Collectives is proposed based on effect set prediction. For each aircraft (which designed as an agent), the dominant effect set are constructed. When an agent cannot communicate with the nodes which in the dominant effect set...
This paper presents a methodology of performance assessment for precision guided system. Hierarchical performance index system is established with a tree-like structure. Scheme of performance evaluation platform design is presented with four main parts, such as process management system, vehicle guidance simulation system, data processing system, and evaluation system. Based on the scheme, performance...
In this paper, we propose a framework to automatically map single-device OpenCL programs to heterogeneous multi-device platforms with performance concerns. Our framework is based on the independence of work groups which built inside the OpenCL programming model and relies heavily on the knowledge of global memory access regions of work groups. So global memory access patterns of work groups are analyzed...
The reasonable dispatching is a key part in maintaining security and stability of power system. Due to the uncertainties such as weather and equipment aging, dispatching operation often faces certain risks. It is essential to analyze the real-time risk of dispatching operation to ensure that the risk can be controlled before dispatching orders are carried out. In this paper, risk theory is implied...
To improve the precision of equivalent plane method used to calculate structural system reliability, the concept of multiple correlation was adopted to structural reliability analysis, and multiple correlation-equivalent plane method was presented. With the multiple correlation coefficients which express the correlation between equivalent plane and other limit state surfaces, this method solves the...
Evaluation of spatial accessibility are always the research hotspot in space planning, geography and so on. This article makes full use of two GIS-based accessibility measures including the two-step floating catchment area method and the gravity-based method to examining spatial accessibility to town and rural in Dachang County. Based on communicant and socioeconomic data of Dachang County in 2009,...
Monitoring and assessing land degradation is important to local sustainable development in Guizhou province, Southwest China, where limestone distributed about 61.7 %. Using the 1 km Advanced Very High Resolution Radiometer Normalized Difference Vegetation Index (AVHRR/NDVI) data (1992-1993) and 500 m, Moderate Resolution Imaging Spectroradiometer Normalized Difference Vegetation Index (MODIS/NDVI)...
The objective of this study was to examine the vegetation response to the climatic variation in Guizhou province, Southwest China. The relationship between vegetation and climate change was investigated with Normalized Difference Vegetation Index (NDVI) (1982-1999) images derived from the Advanced Very High Resolution Radiometer (AVHRR), and climate data acquired from 19 meteorological stations in...
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