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Enhancing focused crawling with genetic algorithms

Enhancing focused crawling with genetic algorithms

引用

international conference on information technology: coding and computing (itcc)

作者： M. Shokouhi P. Chubak Z. Raeesy School of Computer Science and IT RMIT University Melbourne Australia Department of Computer Engineering Sharif University of Technology Tehran Iran Department of Computer Engineering Bu-Ali Sina University Tehran Iran

Web crawlers are one of the most crucial components in search engines and their optimization would have a great effect on improving the searching efficiency. In this paper, we introduce an intelligent crawler called Gcrawler that uses a genetic algorithm for improving its crawling performance. Gcrawler estimates the best path for crawling on one hand and expands its initial keywords by using a genetic algorithm during the crawling on the other hand. This is the first crawler that acts intelligently without any relevance feedback or training. All the processes are online and there is no need for direct interaction with the users.

关键词： Genetic algorithms Crawlers Focusing Search engines Computer science Biomedical measurements Feedback Web sites Databases Bandwidth

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Parallel multiple sequence alignment with dynamic scheduling

Parallel multiple sequence alignment with dynamic scheduling

引用

international conference on information technology: coding and computing (itcc)

作者： Jiancong Luo I. Ahmad M. Ahmed R. Paul Department of Computer Science and Engineering University of Technology Arlington TX USA Office of the Secretary of Defense Washington D.C. DC USA

This paper proposes a parallel implementation of the multiple sequence alignment algorithm, known as ClustalW, on distributed memory parallel machines. The proposed algorithm divides a progressive alignment into subtasks and schedules them dynamically. A task tree is built according to the dependency of the generated phylogenetic tree. The computation and communication costs of the tasks are estimated at run-time and updated periodically. With dynamic scheduling, tasks are allocated to the processors considering the tasks' estimated computation and communication costs and the processors' workload in order to minimize the completion time. The experiment results show that the proposed parallel implementation achieves a considerable speedup over the sequential ClustalW.

关键词： Dynamic scheduling Sequences Computational efficiency Computer science Parallel machines Scheduling algorithm Processor scheduling Phylogeny Runtime Parallel processing

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Layered MPEG video transmission over IP DiffServ

Layered MPEG video transmission over IP DiffServ

引用

international conference on information technology: coding and computing (itcc)

作者： Hong Zhao N. Ansari Y.Q. Shi College of Engineering Embrey-Riddle Aeronautical University Prescott AZ USA Advanced Networking Laboratory New Jersey Institute of Technology Newark NJ USA

Multimedia applications have become one of the major traffic to be transported through networks. These applications require high bandwidth and stringent quality of service (QoS). The end video quality is determined not only by the network QoS but also by the encoded video quality. We consider video quality from these two aspects and propose to transport spatial scalable encoded videos with different dropping priorities over DiffServ (differentiated service). Performance analysis and simulation results show that this can provision QoS guarantees. The dropping policy we propose at the egress router can reduce the traffic load as well as the risk of congestion in other domains.

关键词： Diffserv networks Quality of service Bandwidth Telecommunication traffic Video compression Videoconference Delay Performance analysis Analytical models Web and internet services

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Towards an intrusion detection system for pervasive computing environments

Towards an intrusion detection system for pervasive computin...

引用

international conference on information technology: coding and computing (itcc)

作者： P. Kannadiga M. Zulkernine S.I. Ahamed School of Computing Queen's University Kingston ONT Canada Department of Math Stat. and Com. Science Marquette University Milwaukee WI USA

A pervasive computing environment consists of numerous casually accessible, frequently mobile, embedded, handheld devices capable of sensing the environment around it and reacting intelligently to simplify user activities. These devices are distributed everywhere at office, homes, stores, classroom, and are often connected to ad-hoc network and the Internet providing access from anywhere and anytime. Access control mechanisms can sometimes fail to provide complete security to these pervasive computing devices as witnessed in infrastructure based networks. The addition of pervasive computing devices to infrastructure based networks makes the problem of intrusion detection even harder. In this paper, the challenges and characteristics of intrusion detection in pervasive computing devices are discussed along with a mobile agents-based solution for both for a network environment made up of infrastructure based network and pervasive computing devices.

关键词： Intrusion detection Pervasive computing Mobile agents Mobile computing Personal digital assistants Computer networks Handheld computers Ad hoc networks Access control Internet

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Digital chips for an on-line casino

Digital chips for an on-line casino

引用

international conference on information technology: coding and computing (itcc)

作者： J. Castella-Roca G. Navarro J.A. Ortega-Ruiz J. Garcia ETSE-URV Catalonia Spain Universidad Autonoma de Barcelona Catalonia Spain

Unlike in traditional environments, e-gambling players must make a beforehand payment to start a game. Most on-line casinos currently solve this problem using prepayment systems where the on-line casino has absolute control over all the transactions among the players. However, this solution poses a great number of problems because of the necessary trust relation between players and the on-line casino managers. To reduce this strong trust relationship with the on-line casino, the authors proposed in this paper the use of a reliable digital chips system, which provides auditing facilities, and can be trusted by external parties. Digital chips, just like physical ones, will be used for players instead of legal course money. A set of cryptographic protocols will protect the different actions that players can perform using these digital chips.

关键词： Credit cards Control systems Law Legal factors Cryptographic protocols Government Protection Security Cryptography information technology

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Using RoleOf relationship in design pattern instantiation

Using RoleOf relationship in design pattern instantiation

引用

international conference on information technology: coding and computing (itcc)

作者： Chengwan He Keqing He F. He Feng Yao Jin Liu State key laboratory of Software Engineering Wuhan University of China China MDA Technology Department Fujitsu Laboratories Limited Shin-yokohama Japan Department of Computer Science and Technology Wuhan Institute of Chemical Technology China

The scattering of pattern logic (the attributes and methods of pattern role) is the most typical problem on design pattern instantiation, that is, pattern logic scatters across multiple business classes, which causes problems, such as, debasing the reusability of pattern logic, losing the instantiation information of pattern (traceability and overlapping problem) etc. To resolve these problems in design level, an approach to design pattern instantiation based on RoleOf relationship is proposed. It treats role as the independent modeling element and introduces RoleOf relationship between business class and role, which makes the business logic and the pattern logic completely separated, thus improves its reusability. Through the extension of UML, the meta-model and semantics of RoleOf relationship, and stereotypes and tagged values used for identify pattern information are provided, it resolves the traceability and overlapping problem. Finally, the implementation method of RoleOf relationship is discussed through an example.

关键词： Scattering Documentation Chemical technology Logic design Unified modeling language Concrete Application software Pattern analysis Laboratories Software engineering

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AES power attack based on induced cache miss and countermeasure

AES power attack based on induced cache miss and countermeas...

引用

international conference on information technology: coding and computing (itcc)

作者： G. Bertoni V. Zaccaria L. Breveglieri M. Monchiero G. Palermo Advanced System Technology STMicroelectronics Agrate Milan Italy Dipartimento di Elettronica e Informazione Politecnico di Milano Milan Italy

This paper presents a new attack against a software implementation of the Advanced Encryption Standard. The attack aims at flushing elements of the SBOX from the cache, thus inducing a cache miss during the encryption phase. The power trace is then used to detect when the cache miss occurs; if the miss happens in the first round of the AES then the information can be used to recover part of the secret key. The attack has been simulated using the Wattch simulation framework and a simple software implementation of AES (using a single table for the SBOX). The attack can be easily extended to more sophisticated versions of AES with more than one table. Eventually, we present a simple countermeasure which does not require randomization.

关键词： Cryptography Delay Software standards Cache memory Energy consumption Timing information technology Computer architecture

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A proposal of short proxy signature using pairing

A proposal of short proxy signature using pairing

引用

international conference on information technology: coding and computing (itcc)

作者： T. Okamoto A. Inomata E. Okamoto Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Ibaraki Japan Japan Science and Technology Agency Minato Tokyo Japan

In this paper, we propose a new pairing-based proxy signature. Most remarkable point in our proposal is that our scheme realizes short signature. More concretely, the explicit proxy signature consists of only one parameter. This means that the size of signature is reduced to at least half-size compared to previous schemes. Amount of work for proxy signature generation is also small. Although some previous schemes such as Boneh-Lynn-Shacham (2001) or Hess (2002), need a special hash function, our scheme does not require such a function. This means that our scheme can use general hash function, e.g., SHA-1. To construct our scheme, we propose a new problem named the (extended) k-plus problem. We also propose a short signature scheme which has satisfactory properties from the point of efficiency.

关键词： Proposals Elliptic curve cryptography Electrochemical machining Security Systems engineering and theory Authentication Bandwidth Elliptic curves Public key information technology

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Stateful Inspection firewall session table processing

Stateful Inspection firewall session table processing

引用

international conference on information technology: coding and computing (itcc)

作者： Xin Li Zheng-Zhou Ji Ming-Zeng Hu School of Computer Science and Technology Harbin Institute of Technology Harbin China

ISBN: (纸本)0769523153

Stateful Inspection is a key technology to network devices such as routers and firewalls. Existed session table architectures of Stateful Inspection devices store all session information in a single entry, which causes high time cost of session table timeout processing. In this paper we present a new architecture which divides a session entry into two parts, and designs different data structures for each other. The new architecture can improve the performance of session table greatly. A new PATRICIA algorithm is proposed to organize session table, which is proved to be an optimal 2-ary trie for fixed-length match. An ASIC is implemented for the architecture and corresponding algorithms. Both theoretical and experimental results show that the new architecture has better performance than existed architectures, and can work well in Gigabit Ethernet network.

关键词： Inspection Data structures Application specific integrated circuits Computer science Computer architecture Costs Ethernet networks Filtering Security Space technology

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Fast parallel table lookups to accelerate symmetric-key cryptography

Fast parallel table lookups to accelerate symmetric-key cryp...

引用

international conference on information technology: coding and computing (itcc)

作者： A. Murat Fiskiran R.B. Lee Department of Electrical Engineering Princeton University USA

Table lookups are one of the most frequently-used operations in symmetric key ciphers. Particularly in the newer algorithms such as the advanced encryption standard (AES), we frequently find that the greatest fraction of the execution time is spent during table lookups, varying between 34% and 72% for the five representative ciphers we consider: AES, Blowfish, Twofish, MARS, and RC4. In order to accelerate and parallelize these table lookups, we describe a new parallel table lookup (ptlu) instruction. Our synthesis results indicate that such an instruction can be added to a basic RISC processor with no cycle time impact. We compare the performance of the ptlu instruction with the speedups available through more conventional architectural techniques such as multiple-issue execution. We find that the performance benefits of using the ptlu instruction can be far higher than increasing the number of instructions executed per cycle in superscalar or VLIW processors.

关键词： Acceleration Cryptography Table lookup Mars Computer aided instruction Reduced instruction set computing VLIW Communication networks IP networks Aggregates

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