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Joint Conference of the 47th Annual Meeting of the Association for Computational Linguistics and 4th International Joint Conference on Natural Language Processing of the AFNLP, ACL-IJCNLP 2009

作者： Xiong, Hao Xu, Wenwen Mi, Haitao Liu, Yang Liu, Qun Key Lab. of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences P.O. Box 2704 Beijing 100190 China Key Lab. of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences P.O. Box 2704 Beijing 100190 China

ISBN: (纸本)9781617382581

Tree-based statistical machine translation models have made significant progress in recent years, especially when replacing 1-best trees with packed forests. However, as the parsing accuracy usually goes down dramatically with the increase of sentence length, translating long sentences often takes long time and only produces degenerate translations. We propose a new method named subsentence division that reduces the decoding time and improves the translation quality for tree-based translation. Our approach divides long sentences into several sub-sentences by exploiting tree structures. Large-scale experiments on the NIST 2008 Chinese-to-English test set show that our approach achieves an absolute improvement of 1.1 BLEU points over the baseline system in 50% less time. © 2009 ACL and AFNLP.

关键词： Machine translation

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TACS: A transparent application bandwidth management system

TACS: A transparent application bandwidth management system

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IEEE 9th International Conference on computer and Information Technology, CIT 2009

作者： Chen, Xianqin Long, Xiang Gao, Xiaopeng Ma, Junjie State Key Lab. of Virtual Reality Technology and System School of Computer Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100191 China

ISBN: (纸本)9780769538365

With the rapid advance of computer and network technology, more and more applications are deployed in the customer-side network. These applications require different quality of service (QoS), but have to share a few bandwidth limited internet connections. Owing to the IP network's best-effort delivery mechanism, the QoS requirements are hard to be satisfied. There have been plenty of QoS solutions in research and industry areas, however, few of them are easy to understand or to deploy. Therefore, we provide a solution, based on a simple and clear model, has the ability of transparently deployed at the inner side of customer's gateway device and controlled in the application-oriented way. We also introduce a straightforward QoS policy definition language to allow user to create QoS rules for various applications. We conduct the evaluation of our proto type system running upon mid-end industrial personal computer under both the lab.testbed and the practical network. In the lab.test, our system achieves 200Mbps throughput, in the practical field test, our system successfully manages a 100Mbps internet link for over 3000 active users. © 2009 IEEE.

关键词： Quality of service

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Collosion detection research based on capsule bounding volume

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Journal of Computational Information systems 2014年第7期10卷 2743-2750页

作者： Kong, Dehan Liu, Yongshan Cui, Na Department of Information Science and Engineering Yanshan University Qinhuangdao 066004 China The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Qinhuangdao 066004 China The Data Industry Research Lab. Qinhuangdao 066004 China

A collision detection algorithm based on capsule bounding volume (CBV for short) is presented improve the efficiency of Collision detection in three-dimensional scene. This algorithm use CBV to encircle roles and achieve collision detection between the virtual characters and static objects and dynamic objects in the scene. It includes collision detection between CBV and AABB, triangular and capsule. Theoretical analysis and experimental results show that this algorithm can improve real time for collision detection. © 2014 Binary Information Press.

关键词： Information systems

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Improved cryptanalysis of the VMPC stream cipher

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Journal of Computational Information systems 2012年第2期8卷 831-838页

作者： Li, Shunbo Hu, Yupu Zhao, Yongbin Wang, Yan Department of Mathematics Xidian University Xi'an 710071 China Key Lab. of Computer Networks and Information Security Ministry of Education Xidian University Xi'an 710071 China School of Science Xi'an University of Architecture and Technology Xi'an 710055 China

VMPC is a modified RC4 stream cipher proposed in FSE 2004, which is designed especially to resist distinguishing attacks. In this paper, we present a heuristic distinguishing attack against VMPC. By finding the weakness in the first two words of a keystream with two effective assumptions, we build a distinguisher and get a considerable bias. This attack only requires about 234.02 output bytes to distinguish VMPC from truly random sequence with success probability 0.9545. Thereby, this technique is further used to the Tsunoo's method and improve his results by a factor of about 24. 1553-9105/Copyright © 2012 Binary Information Press.

关键词： Cryptography

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An Efficient Scheme for Parallelizing Fast Search Algorithm on SIMD architecture in H.264/AVC 20

An Efficient Scheme for Parallelizing Fast Search Algorithm ...

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20th International Conference on Parallel and Distributed Computing systems, PDCS 2007

作者： Park, Jung-Min Park, Jung-Wook Kim, Cheong-Ghil Park, Gi-Ho Kim, Shin-Dug Department of Computer Science Yonsei University Seoul Korea Republic of Processor Architecture Lab. System LSI Division Samsung Electronics Co. Ltd Giheung Korea Republic of

ISBN: (纸本)9781604233926

As the video CODECs become complex increasingly according to the convergence of digital equipments designed for different kinds of specific purposes, the demand of higher performance for video processing is continuously needed. The fast search methods are well known as a representative approach to overcome the performance bottleneck of video encoding. But they require huge computations and dominate most of the running time of video encoding. So, a parallel processing is required to enhance the performance. In general, the fast search methods are difficult to be parallelized because their memory access patterns are not followed by a definite form. This paper proposes a new method for parallelizing a fast search method using linear SIMD architecture with only one-to-one connection between a PE and a memory bank. The simulation results show that the proposed method can reduce nearly 20 percent of running time in the motion estimation (ME). © 20th International Conference on Parallel and Distributed Computing systems, PDCS 2007. All rights reserved.

关键词： Motion estimation

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A Learning Evasive Email-Based P2P-Like Botnet

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China Communications 2018年第2期15卷 15-24页

作者： Zhi Wang Meilin Qin Mengqi Chen Chunfu Jia Yong Ma College of Computer and Control Engineering Nankai University Tianjin 300350 China Information Security Evaluation Center of Civil Aviation Civil Aviation University of China Tianjin 300300 China Key Lab. on High Trusted Information System in Hebei Province Baoding 071002 China

Nowadays, machine learning is widely used in malware detection system as a core component. The machine learning algorithm is designed under the assumption that all datasets follow the same underlying data distribution. But the real-world malware data distribution is not stable and changes with time. By exploiting the knowledge of the machine learning algorithm and malware data concept drift problem, we show a novel learning evasive botnet architecture and a stealthy and secure C&C mechanism. Based on the email communication channel, we construct a stealthy email-based P2 P-like botnet that exploit the excellent reputation of email servers and a huge amount of benign email communication in the same channel. The experiment results show horizontal correlation learning algorithm is difficult to separate malicious email traffic from normal email traffic based on the volume features and time-related features with enough confidence. We discuss the malware data concept drift and possible defense strategies.

关键词： malware botnet learning evasion command and control

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Standard Analysis for Transfer Delay in CTCS-3

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Chinese Journal of Electronics 2017年第5期26卷 1057-1063页

作者： CAO Yuan MA Lianchuan XIAO Shuo ZHANG Xia XU Wei National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University School of Computer Sciences and Technology China University of Mining & Technology National Mobile Communications Research Lab. Southeast University

According to the standard for the GSM for railway(GSM-R) wireless systems in China train control system level 3(CTCS-3),the control data transfer delay should be no larger than 500 ms with greater than99% *** of both non-redundant networks and intercross redundant networks and cases of single Mobile terminals(MTs) and redundant MTs on one train are considered,and the corresponding vehicle-ground communication models,delay models,and fault models are *** simulation results confirm that the transfer delay can meet the standard requirements under all *** particular,the probability is greater than 99.996% for redundant MTs and networks,and the standard of transfer delay in CTCS-3 will be improved inevitably.

关键词： China train control system level 3(CTCS-3) GSM for railway(GSM-R) Data transfer delay Deterministic and stochastic petri net(DSPN)

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TAX-B2BREC: Multi-Stage Cascade Downstream Company Recommender system Based on Taxation Data 7

TAX-B2BREC: Multi-Stage Cascade Downstream Company Recommend...

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7th IEEE International Conference on Network Intelligence and Digital Content, IC-NIDC 2021

作者： Wang, Shengmin Chu, Yi Qiao, Zhenhao Ma, Lan Zhang, Hao Wang, Zehao Qiao, Yuanyuan Beijing University of Posts and Telecommunications Beijing Lab. of Adv. Info. Networks Beijing Key Lab. of Network System Architecture and Convergence Beijing100876 China The Technology Research Institute Aisino Corporation Beijing100195 China

ISBN: (纸本)9781665405829

The public crisis triggered by the COVID-19 pandemic has disastrous effects for B2B markets. With the supply chain and trade disrupted, the benefits of the company have been affected to varying degrees. In order to help companies find potential customers and recover the supply chain, we propose a multi-stage cascade downstream company recommender system based on taxation data. The proposed system can recommend potential buyers for upstream companies, which can help upstream companies find new sales channels. This system includes data processing, matching module, ranking module and system deployment. In the match module, we propose a hybrid recall algorithm to generate the candidate enterprises. In the ranking module, we use DCNV2 model to rank the candidate companies. Moreover, the multistage cascade recommendation algorithm achieves better results compared with the traditional algorithm in B2B recommender system. © 2021 IEEE.

关键词： Recommender systems

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A collab.rative method for business process oriented requirements acquisition and refining

A collaborative method for business process oriented require...

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2014 International Conference on Software and systems Process, ICSSP 2014

作者： Lai, Han Peng, Rong Ni, Yuze State Key Lab. of Software Engineering Computer School Wuhan University Wuhan China Chongqing Key Lab. of Electronic Commerce and Supply Chain System Chongqing Technology and Business University Chongqing China School of Computer Science and Information Engineering Chongqing Technology and Business University Chongqing China

ISBN: (纸本)9781450327541

Requirements Elicitation (RE) is a critical process in system/software engineering. Its goal is to capture the stakeholders expectations, needs and constraints, which can be elicited, analyzed and specified as requirements. Gathering the requirements correctly, clearly and completely in a natural way is a typical challenging problem, because requirements analysts always play key roles in the elicitation process dominantly while stakeholders participate in passively. In this paper, we propose a collective intelligence driven business process oriented requirements acquisition and refining method. Its aim is to reduce the requirements analysts dominance and promote stakeholders self-expression and self-improvement to elicit requirements clearly and completely. It adopts the group storytelling method to promote the collab.ration and communication among stakeholders, utilizes the narrative network model to enhance the associations among story fragments, and introduces dialogue game theory to guide the progressive refining. At the same time, the activity theory is adopted as the description framework to present the method and an application example is introduced. Finally, a pilot experiment is carried out to evaluate its perceived usefulness and perceived ease of use;and the actual quality of the requirements based on the degree of completeness and understandability in comparison with JAD. The results show that the requirements elicited by BPCRAR are more complete and understandable than JAD. In addition, the BPCRAR is perceived usefulness and ease of use in the experiment. © 2014 ACM.

关键词： Refining

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A scalab.e parallel ray tracing algorithm for satellite imagery

A scalable parallel ray tracing algorithm for satellite imag...

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IEEE International Conference on computer Research and Development

作者： Li, Yu-Gang Zhao, Kun Huang, Yu-Qing Qiu, Zhen-Ge Liu, Zhi-Yong Beijing Lab. of Intelligent Information Technology School of Computer Science BIT Beijing 100081 China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100081 China Institute of Computing Technology Chinese Academy Sciences Beijing China

ISBN: (纸本)9781612848372

Ray-tracing, can produce high-quality images, however, the use of ray-tracing has been limited due to its high demands on computational power and memory bandwidth, especially in the case of satellite imagery. In this paper, we propose a scalab.e parallel ray tracing algorithm of satellite imagery on a cluster of multi-core architecture. The algorithm combines demand-driven and data-driven models in order to reduce communication on the cost of maintaining redundant data. In order to make the most of computer's parallelism and increase computational efficiency, it combines two levels of parallelisms, the TLP parallelism brought by the many core architecture and the inter-node parallelism via MPI and OpenMP. Experiment results show that the algorithm is highly scalab.lity. © 2011 IEEE.

关键词： Satellite imagery

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