In this paper, we propose an efficient mining approach which adopts an indexing mechanism to speed up the execution efficiency and reduce the memory requirement in the utility mining process. Besides, a pruning strate...
详细信息
In this paper, we propose an efficient mining approach which adopts an indexing mechanism to speed up the execution efficiency and reduce the memory requirement in the utility mining process. Besides, a pruning strategy is designed to reduce the number of unpromising itemsets for mining. The experimental results also show the performance of the proposed approach is better than that of traditional two-phase utility mining algorithm under different parameters.
Multi-hop wireless networks (MWNs) are rapidly gaining attention, because they can provide a wide coverage area to Internet users. To provide stable and high-performance network environments, security issues must be a...
详细信息
Multi-hop wireless networks (MWNs) are rapidly gaining attention, because they can provide a wide coverage area to Internet users. To provide stable and high-performance network environments, security issues must be addressed. This paper focuses on the security issues in terms of anomalous relay nodes inside networks because their malicious behaviors can degrade the performance of MWNs. To maintain the network performance of MWNs, we propose a novel network reconfiguration scheme that each node reconstructs a network autonomously using the I/F of the neighbor nodes linked to a misbehaving node. Our proposed scheme reconfigurates topology with an emphasis on the reuse of I/F, the number of the links required to construct, transmission rates, performance anomaly, and network connectivity. We evaluate the effectiveness of the proposed schemes by simulations. The results of simulation indicate that the proposed scheme can prevent the communication performance degradation of the entire MWN.
This paper proposes a new resource allocation algorithm for uplink OFDMA-based cooperative relay networks assuming multiple source nodes, multiple relay nodes and a single destination. The aim is to maximize the total...
详细信息
This paper proposes a new resource allocation algorithm for uplink OFDMA-based cooperative relay networks assuming multiple source nodes, multiple relay nodes and a single destination. The aim is to maximize the total sum of the sources data rates while guaranteeing fairness among them with different QoS requirements. Assuming perfect channel state information (CSI) at the resource allocation controller. The optimization problem is formulated such that each source is assigned a weight factor based on its QoS requirements, then the ones with high weights are given more priority to select their resources (relay stations and subcarriers) first. Once the required QoS is achieved for all sources, the weight factor for all sources will be unity. The remaining resources are allocated to the sources with maximum instantaneous rate. The results show that the proposed algorithm outperforms the greedy and static algorithms in terms of outage probability and fairness.
The Internet has been a huge resource for sharing and collecting information including health related information. Some health related information is written by patients (lay persons) discussing their experience about...
详细信息
The Internet has been a huge resource for sharing and collecting information including health related information. Some health related information is written by patients (lay persons) discussing their experience about health problems and treatments. This paper introduces our initial work on providing physicians with clinically useful patient health writings. More specifically, the paper presented our experiments, as a part of the whole research work, on filtering health related text from patient health writings. We focused on selecting possible feature for classifying text from breast cancer mailing list into health and non health related text. Using KNN classification method, we experimented with various features, i.e. all terms, all terms except most frequently used terms, UMLS terms, health related UMLS terms, and health related UMLS semantic types. The experiments showed that UMLS terms extracted from the text is a good feature, compared to the other features.
This paper studies the problem of increasing the efficiency in controlling burst errors that are caused by external noise in the context of digital data transmission. For this purpose, the utilization of special weigh...
详细信息
ISBN:
(纸本)9789604742004
This paper studies the problem of increasing the efficiency in controlling burst errors that are caused by external noise in the context of digital data transmission. For this purpose, the utilization of special weighted check sum modification has been proposed. Indeed, an algorithm for burst error control is presented and its use is illustrated via the presentation of an example in order to show that the technique proposed in this paper ensures superior data transmission error control effectiveness compared with already known codes.
Intelligent Tutoring Systems (ITS) are computer-based education tools used for adaptive learning. An ITS authoring system allows teachers to create different modules of an intelligent tutoring system. In this paper, w...
详细信息
Intelligent Tutoring Systems (ITS) are computer-based education tools used for adaptive learning. An ITS authoring system allows teachers to create different modules of an intelligent tutoring system. In this paper, we present an ITS authoring system that allows teachers with very less computer skill to author most important modules of an ITS with minimum efforts. The salient features of the system include authoring multilingual documents, defining teaching strategies using fuzzy rules, representing student models through fuzzy state transition automata. The authoring system was used by the teachers and evaluated. The results shows fair degree of accuracy, which may further be improved by adding few more features.
The major issue of electromagnetic immunity of automotive electronics to the radiation of vehicle-to-vehicle systems is the subject of this paper. Inter-vehicle communication systems provide a wide range of new servic...
详细信息
The major issue of electromagnetic immunity of automotive electronics to the radiation of vehicle-to-vehicle systems is the subject of this paper. Inter-vehicle communication systems provide a wide range of new services and applications for vehicular environments, but they are still under development. Although very promising for the future of intelligent transportation systems, they may become hazardous for automotive electronics. A core numerical analysis of the electric field produced by such a system is performed by means of the full wave Finite Difference Time Domain method. The electric field intensity levels in a vehicle due to a vehicle-to-vehicle communication system is estimated for various cases according to the corresponding IEEE standard and compared to the maximum allowed levels for electronic devices.
For an undirected n-vertex planar graph G with non-negative edge-weights, we consider the following type of query: given two vertices s and t in G, what is the weight of a min st-cut in G? We show how to answer such q...
详细信息
For an undirected n-vertex planar graph G with non-negative edge-weights, we consider the following type of query: given two vertices s and t in G, what is the weight of a min st-cut in G? We show how to answer such queries in constant time with O(n log 5 n) preprocessing time and O(n log n) space. We use a Gomory-Hu tree to represent all the pairwise min st-cuts implicitly. Previously, no subquadratic time algorithm was known for this problem. Our oracle can be extended to report the min st-cuts in time proportional to their size. Since all-pairs min si-cut and the minimum cycle basis are dual problems in planar graphs, we also obtain an implicit representation of a minimum cycle basis in O(n log 5 n) time and O(n log n) space and an explicit representation with additional O(C) time and space where G is the size of the basis. To obtain our results, we require that shortest paths be unique; this assumption can be removed deterministically with an additional O(log 2 n) running-time factor.
An important issue in the analysis of two-dimensional electrophoresis images is the detection and quantification of protein spots. The main challenges in the segmentation of 2DGE images are to separate overlapping pro...
详细信息
An important issue in the analysis of two-dimensional electrophoresis images is the detection and quantification of protein spots. The main challenges in the segmentation of 2DGE images are to separate overlapping protein spots correctly and to find the abundance of weak protein spots. To enable comparison of protein patterns between different samples, it is necessary to match the patterns so that homologous spots are identified. In this paper we describe a new robust technique to segment and model the different spots present in the gels. The watershed segmentation algorithm is modified to handle the problem of over segmentation by initially partitioning the image to mosaic regions using the composition of fuzzy relations. The experimental results showed the effectiveness of the proposed algorithm to overcome the over segmentation problem associated with the available algorithms.
暂无评论