In this paper, dynamic multicast routing and routing optimization criteria have been described. By comparing and analyzing the advantages and disadvantages of several non-rearranged dynamic multicast algorithms, the advantages of the non- rearranged dynamic multicast routing algorithm based on the delay constraint have been further confirmed and a conclusion has been drawn by performance testing.
Crop diseases occurrence have a great impact on Agricultural Production. Using the technology based on machine recognition to identify crop diseases automatically has important significance on agricultural production. The principles of the Bayesian Classification and the Fuzzy Pattern Recognition are introduced in this paper. Classification on 5 kinds of corn leaf diseases spot respectively are implemented based these two methods. The results show that the average recognition rate of Fuzzy Pattern Recognition is higher than Bayesian Classification’s on corn leaf disease spot. Average recognition rate of the 5 kinds of corn leaf disease spot is more than 93%.
The photosynthesis of rice sheath plays a significant role to furnish rice yield, and it is accounted for 10 to 20% of the final yield. But, limited studies have been done to address this phenomenon and to characterize the features of the photosynthetic tissue in rice sheath. In this paper, a super hybrid rice and a hybrid rice were studied as the experimental materials, and the characteristics of the photosynthetic tissue in rice sheaths were examined by microscopic and super-microscopic observation. The results showed that the photosynthetic tissue of rice sheath was rich in the intact mesophyllous cells full of chloroplasts, grana and thylakoids, which were much the same as those of rice blade. The stomatal density in the outer epidermises of the sheaths was comparable to those in the up- and down-epidermises of the blades. The mesophyllous cells in the sheaths were also rich in chlorophylls, and had the net photosynthetic rate (Pn). Therefore, rice sheath was also full of the intact photosynthetic apparatus similar to those in rice blade, and had capabilities of photosynthesis.
SAS 9.0 statistical analysis tool was used to analyze the change of sown area and per unit area yield of major cucurbits and vegetables in Hainan. The result showed that the sown area of major cucurbits and vegetables were significantly different. In recent years, with the consumption amount increase of fertilizer and pesticide and the breeding and popularizing of new varieties, the per unit area yield of major cucurbits and vegetables showed a rising trend. ArcGIS Spatial Analysis tool was used to map the change trend of per unit area yield of cucurbits and vegetables, the result showed that per unit area yield of the cucurbits and vegetables were different to some degree in the cities and counties of Hainan. This study laid a solid foundation for the further development of the vegetable industry in Hainan.
The Analysis of factors affecting gross agricultural production has great significance for making rational agriculture development planning. In this study, the SAS 9.0 statistical analysis tool and the ArcGIS Spatial Analysis tool were used to analyze the effects of CCF, CP, SAG, SAS, SAV, and NEPA on gross agricultural production in Hainan, the results showed that the SAG is the main influence factor of gross agricultural production in Hainan, the correlation coefficient was 0.87.
Sustainable development is an important topic of concern in the context of increasingly serious environmental problems at both local and global scales. Coordinating the relationship between human and nature through ecological assessment and planning is an essential scientific issue to promote sustainable development at regional scale. In this paper, based on Remote Sensing (RS) and Geographic Information System (GIS), we integrated remote sensing index, hydrological analysis and multi-factor overlay analysis techniques in the whole ecological planning processes, and completed soil erosion risk assessment and drinking water resource ecological protection planning of Lijiang city, respectively. We found that (1) by utilizing the Normalized Difference Snow Index (NDSI), Modified Normalized Difference Water Index (MNDWI) and Normalized Differential Vegetation Index (NDVI) comprehensively, it is effective to accomplish the mountain land cover information extraction in the study area; (2) by integrating hydrogeomorphic and socio-economic factors and using spatial modeling, the multi-factor overlay analysis technique can improve the effectiveness of water resources protection plan program.