模糊聚类分析在粤西芒果炭疽病流行区域划分上的应用

根据粤西 6个市 (县 )种植的 3个主要芒果品种芒果炭疽病 (Gloeosporium mangiferae P.Henn.et al)病情指数 ,应用模糊聚类分析方法 ,划选出粤西种植芒果的适宜区域。并指出干旱地区不利于该病发生     

Fuzzy synthetic evaluation of water quality of Naoli River using parameter correlation analysis

In order to improve the effectiveness of Fuzzy Synthetic Evaluation （FSE） models, a Parameter Correlation Analysis （PCA） was introduced into the FSE and a case study was carried out in the Naoli River in the Sanjiang Plain, Northeast China. The basic principle of the PCA is that the pairs of parameters which are highly correlated and linear with each other would contribute the same information to an assessment and one of them should be eliminated. The method of the PCA is that a correlation relationship among candidate parameters is examined before the FSE. If there is an apparent nonlinear or curvilinear relationship between two parameters, then both will be retained; if the correlation is significant （p〈0.01）, and the scatter plot suggests a linear relationship, then one of them will be deleted. However, which one will be deleted？ For solving this problem, a sensitivity test was conducted and the higher sensitivity parameters remained. The results indicate that the original data should be preprocessed through the PCA for redundancy and variability. The study shows that introducing the PCA into the FSE can simplify the FSE calculation process greatly, while the results have not been changed much.     

生态系统健康评价软件的设计与实现

本文采用AHP(层次分析法)-Fuzzy(模糊综合评价法)相结合的方法设计实现了生态系统健康评价软件,在软件中将二者进行了算法实现,并结合GIS的地理空间分析功能将AHP-Fuzzy对生态系统健康评价的运算结果可视化。并利用锡林浩特地区的草地生态系统健康状况的若干野外调研数据对该软件的功能实现进行了验证,结果表明生态系统健康评价软件的设计与实现满足草地管理和决策人员的需要,该软件可以实现对单个指标的评价或几个指标组合的评价,是一个评价生态系统健康的很好平台。     

福州地区土地景观格局动态变化及多样性分析

利用1985年与2000年数据计算了福州地区景观格局变化的若干指标。结果表明,整体上福州地区土地景观多样性指数、破碎度指数有所上升,优势度指数下降,景观格局趋于稳定,系统趋于优化。同时,借助ArcGIS8．3软件平台对福州地区2000年土地利用数据进行处理,计算景观多样性指数,然后进行聚类分析,在区域内部划分出多样性程度不同的3类子区：闽侯县景观多样性程度最高,长乐、福清、福州、罗源、闽清、永泰次之,连江、平潭景观多样性程度最低。     

Spatial analysis of groundwater quality for drinking purpose in Sirjan Plain,Iran by fuzzy logic in GIS

At present,due to shortage of water resources,especially in arid and semiarid areas of the world such as Iran,exploitation of groundwater resources with suitable quality for drinking is of high importance.In this regard,contamination of groundwater resources to heavy metals,especially arsenic,is one of the most important hazards that threaten human health.The present study aims to develop an approach for presenting the groundwater quality of Sirjan city in Kerman Province,based on modern tools of spatial zoning in the GIS environment and a fuzzy approach of evaluating drinking water in accordance with the standards of world health organization(WHO).For this purpose,qualitative data related to 22 exploitation wells recorded during 2002 to 2017 were used.In addition,fuzzy aggregate maps were prepared in two scenarios by neglecting and considering arsenic presence in groundwater resources.The results showed a decrease in groundwater quality over time.More specifically,neglecting the presence of arsenic,in 2002,all drinking wells in the area were located in an excellent zone,while in 2017 a number of operation wells were located in the good and medium zone.Also,the final map,considering the presence of arsenic as a limiting factor of drinking water,indicated that parts of the southern regions of the plain would be the best place to dig wells for drinking water.Therefore,the use of new methods can contribute significantly to the usage of groundwater aquifers and provide a good view of the aquifer water quality.     

Layered berthing method and experiment of unmanned surface vehicle based on multiple constraints analysis

Considering the dynamic changes of unmanned surface vehicle (USV) in berthing tasks, the planning and control modes are divided into two phases: the remote phase and the terminal phase. According to the main influencing factors of the two phases, an improved artificial potential field method is proposed to complete autonomous berthing trajectory planning based on the analysis of environment constraint, berth point constraint and USV’s dynamics constraint. Combining with the dynamic characteristics and control objectives at different phases of berthing and analyzing the fuzzy rule regulation strategy of USV’s heading and speed control, an improved adaptive fuzzy PID control method is proposed to solve the control problem of USV, which is influenced by weak maneuver, large disturbance, limited water area and strong shore effect. Finally, the comparative test of berthing simulation verifies the superiority of the proposed control method. The autonomous berthing field experiment is completed based on the "Dolphin-I" small USV. It verifies the validity and feasibility of the proposed autonomous berthing method.     

湖泊富营养化评价模糊集理论与模式

根据湖泊(水库)营养化具有模糊性的特点。建立了湖泊(水库)富营养化评价的模糊集理论与模式,并首次提出富营养化指标综合权重矩阵概念及其确定方法。应用该模式对我国12个湖泊(水库)的富营养化程度进行了评价,结论与实际情况相符。为湖泊(水库)富营养化治理和保护提供了科学依据。上述理论与模型原则上亦可在其他环境评价领域中应用。     

广西夏季旅游气候舒适度的模糊综合评判

气候资源是一个地区旅游业发展的基本因子,对旅游圣地的旅游气候指标进行定量评估,无论是对旅游部门进行旅游资源开发和旅游爱好者选择旅游时间和地点都是十分有意义的。文中选取广西８１个站点１９６６～１９９５年夏季（７月）的平均气温、相对湿度和风速资料,作为评价气候环境对人体舒适度的影响因素,以集合论为基础,采用数学模糊评判方法,对广西夏季旅游气候舒适度进行模糊综合评判。结果是：（１）广西夏季最舒适的地方分布在桂东北、桂西北、桂西山区;（２）最不舒适的是左、右江河谷、浔江平原、南宁盆地、柳州盆地及钦州湾沿海;（３）桂中、桂西、桂东气候较宜人。     

模糊数学在水资源价值研究中的应用

利用模糊综合评价法对江西省临川市水资源价值进行了初步评价 ,并估算了水资源价格 ,其结果较为客观实际 ,具有推广价值     

模糊分类技术在作物类型识别中的应用

介绍了模糊分类技术,并将其应用于多时相ScanSAR的作物识别中。模糊分类技术比传统的最大似然法具有较高的识别精度。结合雷达图像的自身特点,将模糊分类技术与上下文处理相结合,是雷达图像处理的一种有效途径