In the global information era,people acquire more and more information from the Internet,but the quality of the search results is degraded strongly because of the presence of web *** spam is one of the serious problem...
详细信息
In the global information era,people acquire more and more information from the Internet,but the quality of the search results is degraded strongly because of the presence of web *** spam is one of the serious problems for search engines,and many methods have been proposed for spam *** exploit the content features of non-spam in contrast to those of *** content features for non-spam pages always possess lots of statistical regularities; but those for spam pages possess very few statistical regularities,because spam pages are made randomly in order to increase the page *** this paper,we summarize the regularities distributions of content features for non-spam pages,and propose the calculating probability formulae of the entropy and independent n-grams ***,we put forward the calculation formulae of multi features *** them,the notable content features may be used as auxiliary information for spam detection.
This paper studies the problem of semi-supervised learning on graphs, which has recently aroused widespread interest in relational data mining. The focal point of exploration in this area has been the utilization of g...
详细信息
This paper proposes the notion of a greylevel difference classification algorithm in fractal image compression. Then an example of the greylevel difference classification algo rithm is given as an improvement of the q...
详细信息
This paper proposes the notion of a greylevel difference classification algorithm in fractal image compression. Then an example of the greylevel difference classification algo rithm is given as an improvement of the quadrant greylevel and variance classification in the quadtree-based encoding algorithm. The algorithm incorporates the frequency feature in spatial analysis using the notion of average quadrant greylevel difference, leading to an enhancement in terms of encoding time, PSNR value and compression ratio.
Load balance and failure tolerance are the crucial issues for multihomed mobile network. However, existing solutions are still far away from our expectation. In this paper, we first analyze the problems of multihoming...
详细信息
Load balance and failure tolerance are the crucial issues for multihomed mobile network. However, existing solutions are still far away from our expectation. In this paper, we first analyze the problems of multihoming in a nested mobile network and review their existing schemes in the eye of load balance and failure tolerance. Then we give a strengthened model of access router tree, where a novel and comprehensive metric for best path recognition is proposed to realize the load balance. In order to enhance the failure tolerance of the system, we further propose fast handover algorithms which can be used when burst access failure appears. We perform extensive simulations to evaluate the proposed scheme. Results indicate that comprehensive load balance and failure tolerance can be achieved. Moreover, our proposed handover algorithm achieves least latency of package transmission compared with its existing counterparts.
A model of intelligent resource management in a large distributed system is proposed. This model not only can efficiently solve the problem concerning the incompletion of the global states and the monotony of the mana...
详细信息
A model of intelligent resource management in a large distributed system is proposed. This model not only can efficiently solve the problem concerning the incompletion of the global states and the monotony of the management tactics, but also has the self-adapting ability in a large distributed system, so that the system can maintain high performance all the time.
Line segment clipping is a basic operation of the visualization process in computer graphics. So far there exist four computational models for clipping a line segment against a window, (1) the encoding, (2) the parame...
详细信息
Line segment clipping is a basic operation of the visualization process in computer graphics. So far there exist four computational models for clipping a line segment against a window, (1) the encoding, (2) the parametric, (3) the geometric transformation, and (4) the parallel cutting. This paper presents an algorithm that is based on the third method. By making use of symmetric properties of a window and transformation operations, both endpoints of a line segment are transformed, so that the basic cases are reduced into two that can be easily handled, thus the problems in NLN and AS where there are too many sulyprocedure calls and basic cases that are difficult to deal with are tackled. Both analytical and experimental results from random input data show that the algorithm is better than other developed ones, in view of the speed and the number of operations.
In this paper, the relationship between the second order typed - calculus 2 and its higher order version is discussed . A purely syntactic proof of the conservativity of over 2 is given.
In this paper, the relationship between the second order typed - calculus 2 and its higher order version is discussed . A purely syntactic proof of the conservativity of over 2 is given.
A cooperative computing model is presented to support the construction of CSCW systems. The model divides a cooperative system into layers and each layer is formed by component objects. A principal focus of the model ...
详细信息
A cooperative computing model is presented to support the construction of CSCW systems. The model divides a cooperative system into layers and each layer is formed by component objects. A principal focus of the model is the provision of an object linking mechanism which links the relevant objects in the same layer of multiple users to realize multi-level collaboration which is independent of the application. In addition, multi-level collaboration obtains fine-grained collaboration and improves collaboration efficiency. The object-based method used ensures a structured collaboration and facilitates cooperative system development.
Starting from late 2019,the new coronavirus disease(COVID-19)has become a global *** the development of online social media,people prefer to express their opinions and discuss the latest news *** have witnessed the po...
详细信息
Starting from late 2019,the new coronavirus disease(COVID-19)has become a global *** the development of online social media,people prefer to express their opinions and discuss the latest news *** have witnessed the positive influence of online social media,which helped citizens and governments track the development of this pandemic in *** is necessary to apply artificial intelligence(AI)techniques to online social media and automatically discover and track public opinions posted *** this paper,we take Sina Weibo,the most widely used online social media in China,for analysis and *** collect multi-modal microblogs about COVID-19 from 2020/1/1 to 2020/3/31 with a web crawler,including texts and images posted by *** order to effectively discover what is being discussed about COVID-19 without human labeling,we propose a unified multi-modal framework,including an unsupervised short-text topic model to discover and track bursty topics,and a self-supervised model to learn image features so that we can retrieve related images about *** results have shown the effectiveness and superiority of the proposed models,and also have shown the considerable application prospects for analyzing and tracking public opinions about COVID-19.
Mobile applications(apps for short)often need to display ***,inefficient image displaying(IID)issues are pervasive in mobile apps,and can severely impact app performance and user *** paper first establishes a descript...
详细信息
Mobile applications(apps for short)often need to display ***,inefficient image displaying(IID)issues are pervasive in mobile apps,and can severely impact app performance and user *** paper first establishes a descriptive framework for the image displaying procedures of IID *** on the descriptive framework,we conduct an empirical study of 216 real-world IID issues collected from 243 popular open-source Android apps to validate the presence and severity of IID issues,and then shed light on these issues’characteristics to support research on effective issue *** the findings of this study,we propose a static IID issue detection tool TAPIR and evaluate it with 243 real-world Android ***,49 and 64 previously-unknown IID issues in two different versions of 16 apps reported by TAPIR are manually confirmed as true positives,respectively,and 16 previously-unknown IID issues reported by TAPIR have been confirmed by developers and 13 have been ***,we further evaluate the performance impact of these detected IID issues and the performance improvement if they are *** results demonstrate that the IID issues detected by TAPIR indeed cause significant performance degradation,which further show the effectiveness and efficiency of TAPIR.
暂无评论