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2011 5th Malaysian Conference in Software engineering, MySEC 2011

作者： Ahmadi-Abkenari, F. Selamat, Ali Intelligent Software Engineering Laboratory Faculty of Computer Science and Information Systems University of Technology of Malaysia 81310 UTM Skudai Johor Malaysia

ISBN: (纸本)9781457715310

The unpredictable fast growing dimension of the World Wide Web and its non-static nature causes considerable obstacles for Web crawlers including the presence of some incorrect and irrelevant answers among search results set and the scaling issues. Hence, solutions that are more promising are in demand to provide more accurate search outcomes. Because implementing existed Web page importance metrics either link based or context based within a parallel crawler can not be an absolute solution for the coverage of authorized fresh Web content and the accuracy concerns, so employing these metrics is not the final approach within search engines' architecture. This paper proposes an analysis on clickstream data in order to discover the popularity of Web pages in crawl frontier through proposing the metric itself and presenting the experimental results on ranking the UTM Web pages based on the proposed discussed metric. © 2011 IEEE.

关键词： Web crawler

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Network system engineering by controlling the chaotic signals using silicon micro ring resonator

Network system engineering by controlling the chaotic signal...

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International Conference on computer and Communication engineering, ICCCE

作者： A. Shahidinejad A. Nikoukar I. S. Amiri M. Ranjbar A. A. Shojaei J. Ali P. P. Yupapin Faculty of Computer Science & Information Systems (FCSIS) Universiti Teknologi Malaysia (UTM) Johor Bahru Malaysia Institute of Advanced Photonics Science Nanotechnology Research Alliance Universiti Teknologi Malaysia (UTM) Johor Bahru Malaysia Faculty of Electrical Engineering Universiti Teknologi Malaysia (UTM) Johor Bahru Malaysia Centre for Artificial Intelligence and Robotics Universiti Teknologi Malaysia (UTM) Kuala Lumpur Malaysia Advanced Research Center for Photonics Faculty of Science King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

We investigate nonlinear behaviors of light known as bifurcation and chaos within a nonlinear silicon microring resonator (SMRR). The research is used to controlling SMRR's behaviors such as chaos applicable in security coding systems. The variable parameters affect the bifurcation to be happened in smaller roundtrip among total round trip of 20000 or input power. Simulated Results show that rising of the nonlinear refractive indices, coupling coefficients and radius of the SMRR leads to descending in input power and round trips wherein the bifurcation occurs. As result, bifurcation or chaos behaviors are seen at lower input power of 44 W, where the nonlinear refractive index is n 2 = 3.2×10 -20 m 2 /W. Smallest round trips of 4770 and 5720 can be seen for the R = 40 μm and k = 0.1 respectively. The controlled chaotic signals from the SMRR are passing through a polarizer beam splitter to generate quantum binary codes which are used in wireless network communication.

关键词： Bifurcation Optical ring resonators Solitons Chaotic communication Nonlinear optics

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Solving qualitative constraints involving landmarks

Solving qualitative constraints involving landmarks

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Lecture Notes in computer Science

作者： Liu, Weiming Wang, Shengsheng Li, Sanjiang Liu, Dayou Centre for Quantum Computation and Intelligent Systems Faculty of Engineering and Information Technology University of Technology Sydney NSW Australia College of Computer Science and Technology Jilin University Changchun China

ISBN: (纸本)9783642237850

Consistency checking plays a central role in qualitative spatial and temporal reasoning. Given a set of variables V, and a set of constraints Γ taken from a qualitative calculus (e.g. the Interval Algebra (IA) or RCC-8), the aim is to decide if Γ is consistent. The consistency problem has been investigated extensively in the literature. Practical applications e.g. urban planning often impose, in addition to those between undetermined entities (variables), constraints between determined entities (constants or landmarks) and variables. This paper introduces this as a new class of qualitative constraint satisfaction problems, and investigates the new consistency problem in several well-known qualitative calculi, e.g. IA, RCC-5, and RCC-8. We show that the usual local consistency checking algorithm works for IA but fails in RCC-5 and RCC-8. We further show that, if the landmarks are represented by polygons, then the new consistency problem of RCC-5 is tractable but that of RCC-8 is NP-complete. © 2011 Springer-Verlag.

关键词： Constraint satisfaction problems

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Evaluation of critical current density of FeAs-based superconductors

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Journal of the Korea Institute of Applied Superconductivity and Cryogenics 2012年第2期14卷 1-7页

作者： Otabe, Edmund S. Kiuchi, Masaru Matsushita, Teruo Ni, Baorong Qi, Yanpeng Wang, Lei Gao, Zhaoshun Wang, Dongliang Zhang, Xianping Ma, Yanwei Nakajima, Yasuyuki Tamegai, Tsuyoshi Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Department of Information Electronics Fukuoka Institute of Technology 3-30-1 Wajiro-higashi Higashi-ku Fukuoka 811-0295 Japan Institute of Electrical Engineering Chinese Academy of Science P. O. Box 2703 Beijing 100190 China Department Applied Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan TRIP-JST Japan Science and Technology Agency 7 Gobancho Chiyoda-ku Tokyo 102-0076 Japan

In this review paper, we report the characteristics of the critical current density in FeAs based superconductors which is newly discovered by Hosono group of Tokyo Institute of technology on 2008. Since the many specimens in present stage are not single crystals, there are two kinds of critical current density observed in the specimens which are so-called local and global critical current densities. Therefore, it is necessary to evaluate both kinds of critical current densities. The history effect in which the global critical current density shows different values in increasing and decreasing magnetic field is also observed when the specimens have the local and the global critical current densities. The wire which critical current is 180 A is successfully developed with using the knowledge of abovementioned characteristics of two kinds of critical current densities and the history effect.

关键词： Critical currents

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A framework for industry-relevant ontology development

A framework for industry-relevant ontology development

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22nd Australasian Conference on information systems, ACIS 2011

作者： Abdullah, Norris Syed Sadiq, Shazia Indulska, Marta School of Information Technology and Electrical Engineering The University of Queensland QLD Australia School of Information Technology and Electrical Engineering Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia Johor Malaysia UQ Business School The University of Queensland QLD Australia

ISBN: (纸本)9781742102399

Ontology has been widely used to represent many real world aspects and is prominently used as tool to facilitate shared understanding (and knowledge sharing) in a particular domain. Ensuring that such an ontology is relevant to a particular domain, however, remains a challenging task to the ontology developer. This paper introduces a framework that guides industry-relevant ontology development. The framework follows a typical ontology development cycle and details incremental steps that need to be taken to assure industry-relevance of the ontology. To provide a thorough discussion of the framework, we utilise a previously completed ontology development project that followed the developed framework. The project was specifically aimed at developing an industry-relevant ontology for the compliance management domain and was based on three main inputs, namely, scholarly articles, industry expert/practitioner input and industry reports. Our experience indicates that the application of the developed framework promotes ontology development that utilises industry and academic inputs to assure the developed ontology is relevant to its domain. © 2011 Norris Syed Abdullah, Shazia Sadiq, and Marta Indulska.

关键词： Ontology

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Morphed virus family classification based on opcodes statistical feature using decision tree

Morphed virus family classification based on opcodes statist...

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International Conference on Informatics engineering and information Science, ICIEIS 2011

作者： Bashari Rad, Babak Masrom, Maslin Ibrahim, Suhaimi Ibrahim, Subariah Faculty of Computer Science and Information Systems University Technology of Malaysia Malaysia Razak School of Engineering and Advanced Technology University Technology of Malaysia Malaysia Advanced Informatics School University Technology of Malaysia Malaysia

ISBN: (纸本)9783642253263

Use of morphing engine in metamorphic and polymorphic malware, and virus creation kits aid malware authors to produce a plenty number of variants for a virus. These variants belong to a family and have common behavioral and some statistical characteristics. However, these variants are not detectable via a single common string signature. Some statistical analyses have been tested in recent years to fight against these types of multi-variants family malware. In this research, we introduce and examine an opcodes statistical-based classifier using decision tree. This method is very simple in implementation. Our experimental outcome shows that different malware family executable files are classifiable using their opcodes statistical feature, with a high degree of reliability. © 2011 Springer-Verlag.

关键词： Classification (of information)

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Distributed approach to mitigate wormhole attack in wireless sensor networks

Distributed approach to mitigate wormhole attack in wireless...

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7th International Conference on Networked Computing, INC2011

作者： Modirkhazeni, Ali Aghamahmoodi, Saeedeh Modirkhazeni, Arsalan Niknejad, Naghmeh Faculty of Computer Science and Information Systems University Technology Malaysia 81310 UTM Skudai Johor Darultakzim Malaysia Electrical and Computer Engineering Department Shahid Beheshti University Tehran Iran Faculty of Electrical Engineering Sajad University Mashhad Iran

ISBN: (纸本)9788988678428

Wireless sensor network is a growing technology which is offering solution to variety of application areas such as health care, military and industry. These kinds of networks usually apply number of devices known as sensor devices. These sensors which are limited are distributed over the environment and communicate through the wireless media. As sensor devices are limited the network exposed to variety of attacks. Conventional security mechanisms are not suitable for WSNs as they are usually heavy and nodes are limited. One of the most severe attacks to detect and defend in wireless sensor network is wormhole attack which data will be forwarded from one part of the network to the other part trough the wormhole tunnel. In this paper we focused on wormhole attack and proposed distributed network discovery approach to mitigate its effect. According to the simulation our approach can mitigated almost 100% of wormhole attack overload in the environment where 54% of nodes are affected with the wormhole. © 2011 AICIT.

关键词： Sensor nodes

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Atto-Joule gates for the whole voltage range

Atto-Joule gates for the whole voltage range

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2011 11th IEEE International Conference on Nanotechnology, NANO 2011

作者： Beiu, Valeriu Beg, Azam Ibrahim, Walid Department of Computer Engineering Faculty of Information Technology United Arab Emirates University Al Ain United Arab Emirates School of Computing and Intelligent Systems University of Ulster United Kingdom Department of Systems and Computer Engineering Carleton University Ottawa Canada

ISBN: (纸本)9781457715143

Reducing the supply voltage is by far the most widely used low-power technique, as reducing dynamic power quadratically and leakage power linearly, while sacrificing on performances. A similar but less explored route is to reduce and/or limit currents (instead of reducing voltages), e.g., through transistor sizing. This paper details a comparison of a reverse-sized CMOS scheme (which reduces currents), with both a classical CMOS implementation and an ultra low power (ULP) sub-threshold CMOS scheme. Simulation results show that the reverse-sized CMOS inverter performs well over the whole range of supply voltages: (i) it dissipates significantly less than a classical CMOS inverter (20-60×), while it does degrade performances (5-20×) but less than power gaining, i.e., not proportionally;(ii) it is much faster (100-200×) than a ULP inverter, at moderately larger power consumptions (10-40×), but again less than proportional;and (iii) its power-delay-product (PDP) is constantly 5-8×lower than that of the other two inverters considered over the whole range of supply voltages. In particular, a reverse-sized CMOS inverter in 16nm at 300mV has a delay of 9.16ns while breaking the atto-Joule barrier (0.906aJ). © 2011 IEEE.

关键词： CMOS integrated circuits

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Highly reliable and low-power full adder cell

Highly reliable and low-power full adder cell

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2011 11th IEEE International Conference on Nanotechnology, NANO 2011

作者： Ibrahim, Walid Beg, Azam Beiu, Valeriu Department of Computer Engineering Faculty of Information Technology United Arab Emirates University Al Ain United Arab Emirates Department of Systems and Computer Engineering Carleton University Ottawa Canada School of Computing and Intelligent Systems University of Ulster United Kingdom

ISBN: (纸本)9781457715143

Full adders (FAs) are essential for digital circuits including microprocessors, digital signal processors, and microcontrollers. Both the power consumption and the reliability of FAs are crucial as they directly affect: arithmetic logic units, floating-point units, as well as memory address calculations. This paper studies the effect threshold voltage (VTH) variations play on the reliability of a classical 28-transistor FA, and shows that reliability can be enhanced without increasing the occupied area, and while also reducing power consumption. An enabling transistor sizing scheme is used to improve on reliability without increasing power consumption (as reducing and limiting currents). The proposed FA in 16nm predictive technology model (PTM) is significantly more reliable (six orders of magnitude in case of Cout, and three orders of magnitude in case of Sum at 10% input variations) and dissipates 38× less than a classical FA, while being 6× slower. © 2011 IEEE.

关键词： Electric power utilization

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On axon-inspired communications

On axon-inspired communications

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2011 20th European Conference on Circuit Theory and Design, ECCTD 2011

作者： Beiu, Valeriu Ibrahim, Walid Beg, Azam Zhang, Liren Tache, Mihai Department of Computer Engineering Faculty of Information Technology United Arab Emirates University Al Ain United Arab Emirates School of Computing and Intelligent Systems University of Ulster United Kingdom Department of Systems and Computer Engineering Carleton University Ottawa ON Canada

ISBN: (纸本)9781457706189

Power consumption has been recognized as a grand challenge for nanoelectronics. With continuous scaling, wires (much more than devices) are going to be determining (almost entirely) the dynamic power: (i) their numbers are increasing exponentially, as each device needs a few wires;and (ii) they do not scale well, as their parasitic capacitances and RC-delays are not scaling in synch with device scaling. That is why innovations on both evolutionary (i.e., based-on-wires) as well as revolutionary (i.e., without-wire, or beyond-wire) solutions are called upon to tackle this challenge. Trying to find inspiration from neurons, we focus on axons which are able to communicate at quite large distances on an amazingly limited power budget. In particular, the paper analyzes axon-inspired communications as dense locally-connected arrays of voltage-gated (non-linear) ion channels. Our theoretical results suggest that hexagonal arrays should minimize power consumption. Emulating the logical functioning of voltage-gated ion channels by single-electron technology/transistor gates can lead to practical power/energy lower bounds for nanoelectronics. © 2011 IEEE.

关键词： Wire

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