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The Journal of China Universities of Posts and Telecommunications 2010年第4期17卷 80-87页

作者： YUAN Feng HU Yu-pu WANG Yan OU Hai-wen Key Laboratory 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 Key Laboratory of Information Security Beijing Electronic Science and Technology Institute Beijing 100070 China

Patarin proposed the dragon scheme, pointed out the insecurity of the dragon algorithm with one hidden monomial and suggested a candidate dragon signature algorithm with a complicated function. This paper presents an algebraic method to attack the candidate dragon signature algorithm. The attack borrows the basic idea of the attack due to Kipnis and Shamir, and utilizes the underlying algebraic structure of the candidate dragon signature algorithm over the extension field to derive a way to enable the variable Y be viewed as a fixed value. The attack recovers the private keys efficiently when the parameters are n≤2s and D=[logq^d]≤3.

关键词： cryptography public key cryptography polynomials mapping multivariate dragon scheme algebraic method cryptanalysis

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A hop-by-hop energy efficient distributed routing cheme

A hop-by-hop energy efficient distributed routing cheme

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作者： Hou, Chenying Zhang, Fa Anta, Antonio Fernández Wang, Lin Liu, Zhiyong Institute of Computing Technology CAS University of Chinese Academy of Sciences Beijing China Institute IMDEA Networks Madrid Spain Institute of Computing Technology Chinese State Key Lab for Computer Architecture CAS Beijing China

Energy inefficiencies in current networks provide both challenges and opportunities for energy saving. Recently, there are many works focusing on minimizing energy cost from the routing perspective. However, most existing work view them as optimization problems and solve them in a centralized manner such as with a solver or using approximations. In this paper, we focus on a network-wide bi-objective optimization problem, which simultaneously minimizes the total energy consumption using speed scaling and the total traffic delay. We propose a hop-by-hop dynamic distributed routing scheme for the implementation of this network-wide optimization problem. Our scheme is more practical to realize in large distributed networks compared with current centralized energy minimization methods. We can also achieve near global optimal in a distributed manner, while most used shortest path routing protocols such as OSPF cannot make it. Our routing scheme is totally distributed and maintains loop-free routes in every instant. Simulations conducted in real data sets show that the distributed loop-free routing scheme converges to near Pareto optimal values. Also, our method outperforms the widely applied shortest path routing strategy by 30% in energy saving.

关键词： Energy utilization

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Comprehensive information fusion methodology for telecommunication network management

Comprehensive information fusion methodology for telecommuni...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Yun-Lan Wang Zeng-Zhi Li Jun Xue Shi-Min Ban Yin-Liang Zhao Institute of Computer Architecture and Networks Xi''an Jiaotong University Xi'an China

Focuses on Dempster-Schafer (D-S) evidence theory and fuzzy logic based information fusion methodology for telecommunication network management The production rules, fuzzy relations and fuzzy rules for fault diagnosis are multi-source. The multi-source information should be fused to achieve more comprehensive information.. The fusion algorithms for production rules are presented, including the factor coordinator algorithm, sequential iteration algorithm and evidence theory based algorithm. The same is done for fuzzy relations and fuzzy rules. Furthermore, in order to get more reliable diagnosis results, the D-S evidence theory is adopted to fuse the fault diagnosis results from the experts, expert system and fuzzy reasoning system.

关键词： Telecommunication network management Fault diagnosis Fuzzy reasoning Diagnostic expert systems Fuzzy logic Knowledge management Production systems Fuzzy sets Hybrid intelligent systems Fuzzy systems

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Microphytobenthos spatio-temporal dynamics across an intertidal gradient in a tropical estuary using Sentinel-2 imagery

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Science of the Total Environment 2025年 963卷 178516页

作者： Haro, S. Mucheye, T. Caballero, I. Priego, B. Gonzalez, C.J. Gómez-Ramírez, E.H. Corzo, A. Papaspyrou, S. Department of Biology Faculty of Marine and Environmental Sciences University of Cádiz Cádiz Puerto Real11510 Spain Department of Natural Resources Management College of Agriculture and Environmental Science University of Gondar P.O. Box 196 Gondar Ethiopia Cádiz Puerto Real11510 Spain Department of Automation Engineering Electronics and Computer Architecture and Networks School of Engineering University of Cádiz Cádiz Puerto Real11510 Spain Division of Naval Support Marine Hydrographic Institute Spanish Navy Cadiz Spain Universidad de Costa Rica Escuela de Química y CIMAR San Pedro Montes de Oca San José11501-2060 Costa Rica Campus Universitario de Puerto Real Cadiz11510 Spain School of Freshwater Science University of Wisconsin-Milwaukee MilwaukeeWI53204 United States

Intertidal mudflats are among the most productive coastal ecosystems, largely because of the activity of the photosynthetic microbial community on the sediment surface, known as microphytobenthos (MPB). While the dynamics of MPB have been extensively studied in temperate estuaries, there is limited research in tropical estuaries. To address this knowledge gap, we investigated the spatio-temporal dynamics of MPB in the Nicoya Gulf (Costa Rica), one of the world's most productive tropical estuaries, using Sentinel-2 images at 10 m spatial resolution from 2018 to 2022. We used Normalized Difference Vegetation Index (NDVI) values ranging from 0 to 0.4 to monitor MPB cover and growth rates (μNDVI, days−1). Analysis of data using Generalized Additive Models (GAM) showed that up to 62 % of the temporal variability in average MPB NDVI, peaking in late wet and early dry seasons (November–December), can be explained by years and months. The high temperatures and irradiance during the dry season (December to April) in the Nicoya estuary may inhibit MPB growth, contrasting with patterns observed in temperate estuaries. We observed higher MPB NDVI in the upper intertidal zone (mean sea level > 0.5 m) as usually occurs in temperate estuaries. This research highlights the importance of high-resolution satellite imagery for long-term monitoring of MPB dynamics in tropical tidal flats, offering a valuable tool for estimating ecosystem services provided by intertidal MPB, such as primary production, climate regulation, and nutrient cycling on a global scale. © 2025 Elsevier B.V.

关键词： Abiotic

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Towards more intelligent network management: service-oriented proactive fault management using KDD techniques

Towards more intelligent network management: service-oriente...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Liu Kangping Li Zengzhi Wang Zhiwen Zhang Jing Tang Yazhe Institute of Computer Architecture and Networks Xi''an Jiaotong University Xi'an Shaanxi China

In this paper, we present a knowledge discovery system, Data Fusion Supported Frequent Episodes Discovery (DFSPED), for service-oriented proactive fault management in communication networks. The concept of network service topology is proposed first, and context-free grammars and network service dependence graph are used to model the service-oriented proactive fault management. Secondly, with the approaches of data fusion, two catalogues of important fault-pertinent data sources, i.e., service-oriented trouble-reporting data and real time alarm messages, are fused by temporal and spatial associations. KDD techniques are applied to perform incremental mining in the fused sequential events, finding frequent episodes among faults, alarms and service. Fast restoration of key service interruption, fault prediction and preventive maintenance benefit a lot from the discovered episodes.

关键词： Intelligent networks Knowledge management computer network management Network topology Preventive maintenance Telecommunication network topology computer architecture Communication networks Context-aware services Context modeling

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Automating composite SLA management tasks by exploiting service dependency information

Automating composite SLA management tasks by exploiting serv...

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8th European Conference on Web Services, ECOWS 2010

作者： Winkler, Matthias Springer, Thomas Schill, Alexander SAP Research CEC Dresden SAP AG Chemnitzer Str. 48 01187 Dresden Germany Faculty of Computer Science Computer Networks Group Institute for Systems Architecture Nöthnitzer Str. 46 01187 Dresden Germany

ISBN: (纸本)9780769543109

According to the Internet of Services vision, composite services are created by composing services to complex business processes. The relationships between services in a composition are defined by Service Level Agreements (SLAs). Managing composite SLAs is a complex task which is currently performed manually. In this paper we present an approach for automating the management of composite SLAs by exploiting the explicit knowledge about dependencies between composed services. We define a formal model for representing a set of dependencies. A set of algorithms exploits this information to automate tasks of composite SLA management. These tasks are the validation of SLAs during negotiation, the evaluation of SLA renegotiation requests and the evaluation of SLA violations with regard to their effects on other services. We have validated our approach based on a logistics scenario. We present results with respect to performance and a set of test cases demonstrating the added value of dependency information based automated SLA management. © 2010 IEEE.

关键词： Web services

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Determining Relevant Product Information Sources

Determining Relevant Product Information Sources

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Matthias Wauer Chair for Computer Networks Institute for Systems Architecture Technische Universität Dresden Germany

This position paper describes the challenges related to federated enterprise search over heterogeneous product information sources. It focuses on the aspect of finding relevant information sources w.r.t. the user's information need and identifies core research questions with regards to the design and implementation of a potential solution, based on Semantic Web techniques.

关键词： Semantics Taxonomy Ontologies Indexes Semantic Web

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Accelerating allreduce operation: A switch-based solution

Accelerating allreduce operation: A switch-based solution

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2013 IEEE 2013 22nd International Conference on computer Communication and networks, ICCCN 2013

作者： Hu, Nongda Wang, Dawei Cao, Zheng An, Xuejun Sun, Ninghui Institute of Computing Technology Chinese Academy of Sciences Beijing China SKL Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China University of Chinese Academy of Sciences Beijing China Juniper Networks CA United States

ISBN: (纸本)9781467357746

Collective operations, such as allreduce, are widely treated as the critical limiting factors in achieving high performance in massively parallel applications. Conventional host-based implementations, which introduce a large amount of point-to-point communications, are less efficient in large-scale systems. To address this issue, we propose a design of switch chip to accelerate collective operations, especially the allreduce operation. The major advantage of the proposed solution is the high scalability since expensive point-to-point communications are avoided. Two kinds of allreduce operations, namely block-allreduce and burst-allreduce, are implemented for short and long messages, respectively. We evaluated the proposed design with both a cycle-accurate simulator and a FPGA prototype system. The experimental results prove that switch-based allreduce implementation is quite efficient and scalable, especially in large- scale systems. In the prototype, our switch-based implementation significantly outperforms the host- based one, with a 16 times improvement in MPI time on 16 nodes. Furthermore, the simulation shows that, upon scaling from 2 to 4096 nodes, the switch-based allreduce latency only increases slightly by less than 2 us. © 2013 IEEE.

关键词： Large scale systems

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ISAR imaging of ship target based on LMSF signal

ISAR imaging of ship target based on LMSF signal

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2009 Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2009

作者： Zhang, Long Si, Dong Sen He, Wei Xing, Meng Dao State Key Lab for Radar Signal Processing Xidian University Shaanxi 710071 China Xi'an Polytechnic University Shaanxi 710048 China Institute of Computer Architecture and Networks Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)9781424427314

To obtain high resolution ISAR image of ship target in motion with narrow-bandwidth T/R devices and a low-speed A/D sampler, an effective imaging method based on Linearly Modulated Stepped Frequency (LMSF) is proposed in this paper. Firstly, the signal model is developed and analyzed. Secondly, a band coherent processing method is proposed to eliminated the error induced by the translational motion and the high range profile is obtained. Finally, the high resolution of cross range is achieved by using the DechirpClean techinque. The theory analysis and the resutl of real data processing demonstrate the performance of the proposed method. ©2009 IEEE.

关键词： Ships

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Building a Flexible Service architecture for User Controlled Hybrid Clouds

Building a Flexible Service Architecture for User Controlled...

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International Conference on Availability, Reliability and Security, ARES

作者： Anja Strunk Marc Mosch Stephan Groß Yvonne Thoß Alexander Schill Institute of Systems Architecture Chair of Computer Networks Technische Universität Dresden Dresden Germany

Virtualization and broadband Internet connections enabled existing technologies to form up under the nebulous term cloud. Cloud computing promises near infinite scalability and cost reduction by pay per use agreements. However for data outsourced to existing cloud solutions - which can be considered synonymous with unknown locations and potentially hostile environments - the security protection objectives can not be guaranteed. We present an approach that enables users to benefit from cloud computing and retain data sovereignty.

关键词： Cloud computing Availability Encryption Throughput Servers

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