Wu Huarui

Research on the Ontology-Based Complex Event Processing Engine of RFID Technology for Agricultural Products

In order to improve the discriminating capacity of the RFID tags for agricultural products traceability data, a new handling engine ORFID-CEP for complex events of agricultural products RFID Tag based on ontology, is proposed by introducing the event ontology model into the field of the agricultural products quality safety administration. In the new engine, the ontology model of RFID event, semantic space and the rules of the event ontology are defined. In the RFID practical application instances, the number of the fringe real-time events is so large that those methods used in current systems can not handle them in time. Thus, many significant events are lost. Aiming to overcome the problem, the transform system of work flow for the complex event ontology and the optimized strategies for event exploration, event operation and restrictive conditions of event appearance are established. Experimental results show that the new engine can mine more complex events with semantic information than the conventional Esper-CEP engine. Additionally, the new engine is steadier than the Esper-CEP engine. With increasing number of the events, the growth rate of the new engine for mining complex events raises more quickly than Esper-CEP, which indicates that the engine has the good ability of information process.

Modeling Incremental Information of Topographic Database Based on OEM

The distribution of the update information of topographic database is still one of the main open challenges for many data producers. The incremental method is transfer of a data set that is restricted to objects which have been changed since the last transfer. This paper focuses on the modeling and description of incremental information, which is the precondition of distribution. In order to accomplish this task, firstly we analyze the characteristics of incremental information of topographic database. By analysis, we find out that the incremental information is semi-structured by nature. In this respect, this paper investigates the use of SSD (semi-structured data) models--an innovative approach recently developed in Information Technology--for modeling incremental information. A framework for the representation of geographic entities in OEM (Object Exchange Model), a popular model for semi-structured data, is introduced. Additionally, it is shown how to map the OEM representation of incremental information to XML (eXtensible Markup Language) description. Using XML to describe incremental information can help users understand this kind of information and update their databases. A simplified case study in the application domain of the distribution of topographical data is examined closely.

Algorithm for mining association rules with multiple minimum supports based on FP‐Tree

Abstract Association rule mining algorithms can be used to discover all item associations (or rules) in a dataset that satisfy user‐specified constraints, e.g., minimum supports (minsup) and minimum confidence (minconf). Since only one minsup is used for the whole database, it is implicitly assumed in the model that all items are of the same nature and/ or have similar frequencies in the data. This rarely applies in reality, so, based on an FP‐Tree, a new algorithm is proposed called multiple minimum supports for discovering maximum frequent item sets algorithm (MSDMFIA). The algorithm allows users to specify multiple minsups to reflect item natures and various frequencies, which resolves bottlenecks in traditional algorithms, e.g., the frequent generation of candidate itemsets and database scanning. Experimental results show that functionality and performance of the proposed algorithm is significantly improved compared with most others.

Ambient Illumination Consistency Based on Hue Method in a Mixed-scene

Illumination makes an important role in realistic graphics rendering, especially in the mixed-scene rendering based on the geometric models and images. Adjusting illumination effect is a key step to achieve realistic scene when the images are inconsistent with the virtual environment. Therefore, complicated processing is required to generate the image with desired illumination condition. Using the technology of model rendering pipeline based on GPU, this paper presents a hue method to generate consistent ambient illumination between image and geometric models in a mixed-scene without specular and shadow. With this method, we can render the novel image under different ambient lights, and need not a lot of image data.

Research on Agricultural Data Grid System

High performance processing of agricultural data in the grid environment is a complex and hardly problem, mainly due to agricultural data’s geographic distribution, heterogeneity, variety. A layered software architecture agriculture of agricultural data grid is designed. Agricultural meta-data model based spatio-temporal ontology, spatial clustering and mapping for agricultural data, information cooperation, role-based access control are researched. The application environment of agricultural data grid node is constructed. Through the test experiment, finally indicated that, high performance computing capacity is provided with the agricultural data grid system.

A solution to the upper and lower bound of outage probability in ad hoc networks

In this paper, an easy solution to the upper and lower bound of the outage probability in ad hoc networks is presented. First we calculate the characteristic function of a model under power control. Then, we introduce some existing results under a special model which we call it the system model. By comparing the characteristic functions of the normalized interference under two models, we find that under the system model, if we change the node density λ into other parameters in the expression of the bounds, upper and lower bounds of other models (such as a model employing channel inversion as the power control strategy) can be obtained. This method is proved to be correct by comparing our results with the existing ones, and simple in the calculation.