检索结果-内蒙古大学图书馆

2011 8th International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2011, Jointly with the 2011 7th International Conference on Natural Computation, ICNC'11

作者： Wu, Qunhui Ma, Shilong State Key Lab of Software Development Environment Beijing University of Aeronautics and Astronautics Beijing China

ISBN: (纸本)9781612841816

Outlier mining is an important and active research issue in anomaly detection. However, it is a difficult problem since categorical data arrive at a fast rate, some data may be outdated and the outliers identified are likely to change. In this paper, we propose an efficient algorithm for mining outliers from categorical data streams, which discover closed frequent patterns in sliding window first. Then WCFPOF (Weighted Closed Frequent Pattern Outlier Factor) is introduced to measure the complete categorical data, and the corresponding candidate outliers are stored in QIS (Query Indexed Structure). By employing the decayed function, the outdated outliers are faded to generate the final outliers. Experimental results show that our algorithm has higher detection precision than FindFPOF. Otherwise, our algorithm has better scalab.lity with different data sizes. © 2011 IEEE.

关键词： Statistics

来源：评论

学校读者我要写书评

暂无评论

FIFAWC:a dataset with detailed annotation and rich semantics for group activity recognition

引用

Frontiers of Computer Science 2024年第6期18卷 271-272页

作者： Duoxuan PEI Di HUANG Yunhong WANG State Key Laboratory of Software Development Environment School of Computer Science and EngineeringBeihang UniversityBeijing 100191China Intelligent Recognition and Image Processing Lab. School of Computer Science and EngineeringBeihang UniversityBeijing 100191China

1 *** Activity Recognition(GAR),which aims to identify activities performed collectively in videos,has gained significant attention *** conventional action recognition centered on single individuals,GAR explores the c... 详细信息

关键词： has collective gained

来源：评论

学校读者我要写书评

暂无评论

A SVM based method for active relevance feedback

A SVM based method for active relevance feedback

引用

2nd International Conference on Computer and Automation Engineering, ICCAE 2010

作者： Chen, Zilong Lu, Yang State Key Lab. of Software Development Environment BeiHang University HaiDian District Beijing China School of Software and Microelectronics Peking University HaiDian District Beijing China

ISBN: (纸本)9781424455850

In vector space models, traditional relevance feedback techniques, which utilize the terms in the relevant documents to enrich the user's initial query, is an effective method to improve retrieval performance. However, in this process, it also brings some non-relevance terms in the relevant documents in the new query. The number of non-relevance terms will increase according to the repeat of feedback process;it will damage the retrieval performance finally. This paper introduces a SVM Based method for relevance feedback. We train a classifier on the feedback documents and classify the rest of the documents. Thus, in the result list, the relevant documents are in front of the non-relevant documents. The new approach avoids modifying the query via text classification algorithm in the relevance feedback process, and it is a new direction for the relevance feedback techniques. Experiments with TREC dataset demonstrate the effectiveness of this method. ©2010 IEEE.

关键词： Classification (of information)

来源：评论

学校读者我要写书评

暂无评论

End-to-end congestion control for H.264/SVC

End-to-end congestion control for H.264/SVC

引用

6th International Conference on Networking, ICN'07

作者： Xiaogang, Yang Lei, Lei State Key Lab. of Software Development Environment Beihang University Beijing China Institute of Advanced Computing Technology Beihang University Beijing China

ISBN: (纸本)0769528058

H.264/SVC extends the hybrid video coding approach of H.264/AVC, which adopts a layered coding scheme to generate multi-layer bit stream for heterogeneous environments. For the network application of H.264/SVC, congestion control is a crucial issue. This paper proposes an end-to-end rate control mechanism for H.264/SVC based on binomial congestion control algorithm, which is called HBCC and supports the transmission of variable packet length SVC flows. It removes loss retransmission and changes the mechanism of sending an ACK for every packet received to reduce the variations in the frequency of the congestion window and makes real-time video be transmitted smoother. In the end, we use NS2 simulation and video quality metrics to evaluate the scheme. Result shows the scheme is effective © 2007 IEEE.

关键词： Congestion control (communication)

来源：评论

学校读者我要写书评

暂无评论

Towards adaptive web services QoS prediction

Towards adaptive web services QoS prediction

引用

2010 IEEE International Conference on Service-Oriented Computing and Applications, SOCA 2010

作者： Li, Jing Zhao, Yongwang Ren, Jiawen Ma, Dianfu State Key Lab. of Software Development Environment Beihang University Beijing China Institute of Advanced Computing Technology Beihang University Beijing China

ISBN: (纸本)9781424498017

Quality of Service (QoS) has been widely used to support dynamic Web Service (WS) selection and composition. Due to the volatile nature of QoS parameters, QoS prediction has been put forward to understand the trend of QoS data volatility and estimate QoS values in dynamic environments. In order to provide adaptive and effective QoS prediction, we propose a WS QoS prediction approach, named WS-QoSP, based on the technique of forecast combination. Different from the existing QoS prediction approaches that choose a most feasible forecasting model and predict relying on this "best" model, WS-QoSP selects multiple potential forecasting models, combines the results of the selected models to optimize the overall forecast accuracy. Results of real data experiments demonstrate the diversified forecast accuracy gains by using WS-QoSP.

关键词： Web services

来源：评论

学校读者我要写书评

暂无评论

PerF-VH: A per-flow vertical handover protocol for heterogeneous wireless networks

PerF-VH: A per-flow vertical handover protocol for heterogen...

引用

8th World Wireless Congress, WWC 2007

作者： Wang, Jianbai Wei, Wei Lou, Yihua State Key Lab. of Software Development Environment BeiHang University No 37. Xueyuan Road Haidian Dist. Beijing 100083 China

This Paper designs and implements a Per-Flow vertical handover protocol (PerF-VH) based on Mobile IPv6. The protocol adds two messages and a Flow Binding Update List to Mobile IPv6, and implements flexible data flow redirection by modifying the package processing procedure and data structures in Linux kernel. The protocol also provides support for intelligent handover policies of upper layers. Simulations demonstrate that PerF-VH improves the performance of transmission and makes the use of network resources more efficient.

关键词： Internet protocols

来源：评论

学校读者我要写书评

暂无评论

Discovering compatible top-k theme patterns from text based on users' preferences

Discovering compatible top-k theme patterns from text based ...

引用

Pacific Asia Workshop on Intelligence and Security Informatics, PAISI 2009

作者： Tong, Yongxin Ma, Shilong Yu, Dan Zhang, Yuanyuan Zhao, Li Xu, Ke State Key Lab. of Software Development Environment Beihang University Beijing 100191 China China Academy of Telecommunication Technology Beijing 100191 China

ISBN: (纸本)9783642013928

Discovering a representative set of theme patterns from a large amount of text for interpreting their meaning has always been concerned by researches of both data mining and information retrieval. Recent studies of theme pattern mining have paid close attention to the problem of discovering a set of compatible top-k theme patterns with both high-interestingness and lowredundancy. Since different users have different preferences on interestingness and redundancy, how to measure the attributes of the users' preferences, and thereby to discover ′preferred compatible top-k theme patterns (PCTTP) is urgent in the field of text mining. In this paper, a novel strategy of discovering PCTTP based on users' preferences in text mining is proposed. Firstly, an evaluation function of the preferred compatibility between every two theme patterns is presented. Then the preferred compatibilities are archived into a data structure called theme compatibility graph, and a problem called MWSP based on the compatibility graph is proposed to formulate the problem how to discover the PCTTP. Secondly, since MWSP is proved to be a NP-Hard problem, a greedy algorithm, DPCTG, is designed to approximate the optimal solution of MWSP. Thirdly, a quality evaluation model is introduced to measure the compatibility of discovering theme patterns. Empirical studies indicate that a high quality set of PCTTP on four different sub text sets can be obtained from DBLP.

关键词： Quality control

来源：评论

学校读者我要写书评

暂无评论

Detecting context dependent messages in a conversational environment 26

Detecting context dependent messages in a conversational env...

引用

26th International Conference on Computational Linguistics, COLING 2016

作者： Li, Chaozhuo Wu, Yu Wu, Wei Xing, Chen Li, Zhoujun Zhou, Ming State Key Lab. of Software Development Environment Beihang University Beijing China Microsoft Research Beijing China Nankai University Tianjin China

ISBN: (纸本)9784879747020

While automatic response generation for building chatbot systems has drawn a lot of attention recently, there is limited understanding on when we need to consider the linguistic context of an input text in the generation process. The task is challenging, as messages in a conversational environment are short and informal, and evidence that can indicate a message is context dependent is scarce. After a study of social conversation data crawled from the web, we observed that some characteristics estimated from the responses of messages are discriminative for identifying context dependent messages. With the characteristics as weak supervision, we propose using a Long Short Term Memory (LSTM) network to learn a classifier. Our method carries out text representation and classifier learning in a unified framework. Experimental results show that the proposed method can significantly outperform baseline methods on accuracy of classification. © 1963-2018 ACL.

关键词： Long short-term memory

来源：评论

学校读者我要写书评

暂无评论

USO- a new slope one algorithm based on modified user similarity

USO- a new slope one algorithm based on modified user simila...

引用

2012 International Conference on Information Management, Innovation Management and Industrial Engineering, ICIII 2012

作者： Sun, Mingtao Zhang, Hui Song, Shiyu Wu, Kejia State Key Software Development Environment Lab. Beihang University Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9781467319324

Recommendation algorithm based on collab.rative filtering strategy has achieved great success in the field of personalized recommendation, However, based on collab.rative filtering recommendation algorithm complexity is too high, over-fitting problem, the recommended accuracy requirements lead to the algorithm difficult to achieve in practical applications. Slope One algorithm greatly simplifies the complex process of collab.rative filtering algorithm, dramatically reducing the recommended system and maintenance difficulty, but at the same time recommended the accuracy will decline. Recommended in order to take into account the recommendation algorithm of low complexity and high accuracy, the authors propose the improved algorithm based on the correct user similarity Slope One - USO algorithm The inspection results show that the algorithm can effectively improve the accuracy of the recommendation of the slope-one algorithm. ©2012 IEEE.

关键词： Collab.rative filtering

来源：评论

学校读者我要写书评

暂无评论

TANET: Thread-Aware Pretraining for Abstractive Conversational Summarization

TANET: Thread-Aware Pretraining for Abstractive Conversation...

引用

2022 Findings of the Association for Computational Linguistics: NAACL 2022

作者： Yang, Ze Wang, Liran Tian, Zhoujin Wu, Wei Li, Zhoujun State Key Lab of Software Development Environment Beihang University Beijing China Meituan Beijing China

ISBN: (纸本)9781955917766

Although pre-trained language models (PLMs) have achieved great success and become a milestone in NLP, abstractive conversational summarization remains a challenging but less studied task. The difficulty lies in two aspects. One is the lack of large-scale conversational summary data. Another is that applying the existing pre-trained models to this task is tricky because of the structural dependence within the conversation and its informal expression, etc. In this work, we first build a large-scale (11M) pretraining dataset called RCSUM, based on the multi-person discussions in the Reddit community. We then present TANET, a thread-aware Transformerbased network. Unlike the existing pre-trained models that treat a conversation as a sequence of sentences, we argue that the inherent contextual dependency among the utterances plays an essential role in understanding the entire conversation and thus propose two new techniques to incorporate the structural information into our model. The first is thread-aware attention which is computed by taking into account the contextual dependency within utterances. Second, we apply thread prediction loss to predict the relations between utterances. We evaluate our model on four datasets of real conversations, covering types of meeting transcripts, customer-service records, and forum threads. Experimental results demonstrate that TANET achieves a new state-of-the-art in terms of both automatic evaluation and human judgment. © Findings of the Association for Computational Linguistics: NAACL 2022 - Findings.

关键词： Natural language processing systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：