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3rd international conference on Cybernetics and Information Technologies, systems and applications/4th international conference on Computing, Communications and Control Technologies

作者： Rapoport, Lev Verdyan, Armen Holon Acad Inst Technol Dept Sci Holon Israel

ISBN: (纸本)9789806560833

In the past few years, inorganic fullerene-like WS2 and MOS2 nanoparticles (IF) with structures closely related to (nested) carbon fullerenes and nanotubes have been synthesized. Preliminary friction experiments with IF added to oil showed lubricating properties superior to those of layered commercially available WS2 and MOS2 solid lubricant powders in a definite range of operating conditions. The analysis of the IF nanoparticles showed that most, if not all pristine nanoparticles were closed and hollow, having nearly spherical shape the average size of which was close to 120 nm for IF-WS2, and about 50 nm for IF-MoS2- It was found that these nanoparticles are capable of withstanding a severe hydrostatic pressure, caused by compression. Detailed structural studies revealed a deformation of the IF nanoparticles and breakage of their outer shells under compression. The surface topography of the samples before and after the friction tests was studied with scanning probe microscope (SPM) DI Dimension 3100. Friction and wear of steel and ceramic pairs lubricated with oil+ IF lubricant have been studied. On the base of atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoemission spectroscopy (XPS) analysis it was concluded that the islands of destroyed IF nanoparticles could provide improved tribological properties of the contact under severe contact conditions.

关键词： friction and wear solid lubricant structure fullerene-like nanoparticles AFM analysis

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A simple ray-sector signal strength model for indoor 802.11 networks

A simple ray-sector signal strength model for indoor 802.11 ...

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2nd IEEE international conference on Mobile Ad-hoc and Sensor systems, MASS 2005

作者： Li, Xiaoyan Martin, Richard P. Department of Computer Science Rutgers University 110 Frelinghuysen Rd Piscataway NJ 08854

ISBN: (纸本)0780394666

In this paper we present a simple ray-sector model of signal strength for indoor 802.11 networks. Signal strength is an important parameter for a variety of important wireless networking tasks, such as localization and topology control. A sufficiently accurate, yet generic, method of generating signal strength maps is needed in order to accurately simulate, design and evaluate these systems. Our ray-sector model constructs signal maps by adding signal bias with sectors defined by rings and randomized rays, using a traditional log-linear decay model as a baseline. We show our model generates distortions similar to measured radio maps by quantitatively comparing the behavior of micro-benchmarks using maps from two buildings and those generated by our model. Finally, we demonstrate the utility of our model for higher-level applications by showing it accurately predicts the performance for two dissimilar localization algorithms. © 2005 IEEE.

关键词： wireless telecommunication systems

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Using topic keyword clusters for automatic document clustering

Using topic keyword clusters for automatic document clusteri...

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3rd international conference on Information Technology and applications, ICITA 2005

作者： Chang, Hsi-Cheng Hsu, Chiun-Chieh Department of Electronic Engineering Hwa Hsia Institute of Technology No. 111 Gong Thuan Rd. Chung Ho City Taipei 235 Taiwan Department of Information Management National Taiwan University of Science and Technology No.43 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)0769523161

Data clustering is a technique for grouping similar data items together for convenient understanding. Conventional data clustering methods, including agglomerative hierarchical clustering and partitional clustering algorithms frequently perform unsatisfactorily for large text article collections, as well as the compulation complexity of the conventional data clustering methods increase very quick with the number of data items. This paper presents a system for automatic document clustering by identifying topic keyword clusters of the text corpus. The proposed system adopts a multi-stage process. First, an aggressive data cleaning approach is employed to reduce the noise in the free text and further identify the topic keywords within the documents. All extracted keywords are then grouped into topic keyword clusters using the k-nearest neighbor graph approach and the keyword clustering function. Finally, all documents in the corpus are clustered based on the topic keyword clusters. The proposed method was assessed against conventional data clustering methods on a web news collection, indicating that the proposed method is an efficient and effective clustering approach. © 2005 IEEE.

关键词： Program documentation

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Different Types of Linear Fuzzy Cellular Automata and their applications

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FUNDAMENTA INFORMATICAE 2008年第2期87卷 185-205页

作者： Basu, Subhasree Basu, Sumita Lady Brabourne Coll Kolkata 700017 India SIPCOT IT Pk Chennai Math Inst Siruseri 603103 India

A linear array of interconnected fuzzy automaton is called linear fuzzy cellular automaton. It is shown that the language class of linear fuzzy cellular automata strictly contains the language class of linear cellular automata. This justifies the wide spread use of linear fuzzy cellular automaton as is evident from the literature. In this paper a special type of cellular automaton (CA) model is investigated. This CA model computes effect due to interaction of neighboring cells and effect due to external disturbance on the cells simultaneously. The transition due to both the effects may be represented by a single function which is the composition of two functions. Further it is shown that the class of language accepted by linear hybrid fuzzy cellular automata is included in the class of language accepted by linear hybrid fuzzy cellular automata with external input(HFCAI). HFCAI is useful for computing growth in evolutionary systems which are also affected by external cause.

关键词： Cellular automata Fuzzy set Formal languages Parallel computing

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A NOVEL OTDOA POSITIONING SCHEME IN HETEROGENEOUS LTE-ADVANCED systems

A NOVEL OTDOA POSITIONING SCHEME IN HETEROGENEOUS LTE-ADVANC...

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3rd IEEE international conference on Network Infrastructure and Digital Content. (IC-NIDC)

作者： Zhang, Tao Xiao, Dengkun Cui, Jie Luo, Xinlong Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100876 Peoples R China Beijing Inst Huawei Technol Co Ltd Wireless Res Dept Beijing 100094 Peoples R China

ISBN: (纸本)9781467322010;9781467322034

The Observed Time Difference of Arrival (OTDOA) as a major positioning method in 3rd Generation Partnership Project (3GPP) specification has been deeply researched in Long Term Evolution Advanced (LTE-A) system. This paper analyzes the new interference scenarios in Heterogeneous Network (Het-Net) and the drawbacks of conventional OTDOA method which are caused by LPN (Low Power Nodes) deployed in Het-Net. In this paper, we propose a Time division multiplex (TDM) and a Code division multiplex (CDM) scheme for positioning reference signal (PRS) transmitting to solve these problems in Het-Net. Simulation results show that the proposed scheme can greatly improve the positioning accuracy compared with the conventional method and its performance meets the Federal communication commission (FCC) requirement.

关键词： CDM Het-Net OTDOA PRS TDM

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Dynamic User Modeling for Personalized Advertisement Delivery on Mobile Devices

Dynamic User Modeling for Personalized Advertisement Deliver...

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3rd international United Information systems conference (UNISCON 2009)

作者： Paolino, Luca Sebillo, Monica Tortora, Genoveffa Martellone, Alessandro M. Tacconi, David Vitiello, Giuliana Univ Salerno DMI Salerno Italy Futur3 srl I-38100 Trento Italy

ISBN: (纸本)9783642011115

In this paper we present an approach for the presentation of personalized advertisements on mobile devices, which is based on a user model that takes into account user's interests over time. The approach has been adopted within the LUNA wireless network project, which is targeted at realizing a business model such that the services provided in the area of Trento, in the North of Italy, are accessible and usable by everybody, at a very low cost. LUNA client-side mobile application relies on a dynamic user modeling technique. We describe the personalization component of the advertising management system employed and we explain how a user model is dynamically created, saved and updated on the basis of the latest interaction history and of the delivered contents.

关键词： Computers

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A clustering-based approach for a finest biological model generation describing visitor behaviours in a cultural heritage scenario 3

A clustering-based approach for a finest biological model ge...

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3rd international conference on Data Management Technologies and applications, DATA 2014

作者： Cuomo, Salvatore De Michele, Pasquale Ponti, Giovanni Posteraro, Maria Rosaria Department of Mathematics and Applications Univeristy of Naples Federico II Naples Italy UTICT-HPC ENEA Portici Research Center Naples Italy

ISBN: (纸本)9789897580352

We propose a biologically inspired mathematical model to simulate the personalized interactions of users with cultural heritage objects. The main idea is to measure the interests of a spectator w.r.t. an artwork by means of a model able to describe the behaviour dynamics. In this approach, the user is assimilated to a computational neuron, and its interests are deduced by counting potential spike trains, generated by external currents. The main novelty of our approach consists in resorting to clustering task to discover natural groups, which are used in the next step to verify the neuronal response and to tune the computational model. Preliminary experimental results, based on a phantom database and obtained from a real world scenario, are shown. To discuss the obtained results, we report a comparison between the cluster memberships and the spike generation;our approach resulted to perfectly model cluster assignment and spike emission.

关键词： Data mining

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Mobile games through the nets: A cross-layer architecture for seamless playing 10

Mobile games through the nets: A cross-layer architecture fo...

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3rd international ICST conference on Simulation Tools and Techniques, SIMUTools 2010

作者： Ghini, Vittorio Ferretti, Stefano Panzieri, Fabio Department of Computer Science University of Bologna Mura Anteo Zamboni 7 Bologna40127 Italy

ISBN: (纸本)9789639799875

Mobile games are characterized by the need to exploit responsive and reliable communication protocols, in order to guarantee that players can perceive a fluid and dynamic game-play evolution. Current approaches to the provision of support for this kind of real-time applications are generally based on the use of a single wireless network, as the transit from a network to another (or even changing the network service provider, while using the same network interface) causes a temporary reconfiguration of both the operating system and the network interface it is exploiting. This indeed results in a pause of game events processing at the application (game) level, which may give rise to a jerky game evolution. In order to overcome this problem, in this paper we propose the use of a cross-layer architecture which allows mobile devices to concurrently exploit different network interfaces so as to offer seamless and uninterrupted communications among the entities involved in the game. A smart adaptation algorithm balances the load between different network interfaces, based on the performances these are offering. The proposed approach can be viably implemented in client/server as well as in mirrored game server architectures. Experimental results conducted on a real field confirm both the adequacy and the effectiveness of our proposal. Copyright 2010 ICST.

关键词： wireless networks

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MMOD: A general resource scheduling algorithm for computational grid

MMOD: A general resource scheduling algorithm for computatio...

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3rd international conference on Emerging Technologies

作者： Ahmad, Imran Faheem, Sunbal Qasim, G. NWFP Univ Engn & Technol Peshawar Dept Comp Sci & Informat Technol Peshawar Pakistan COMSATS Inst Informat Technol Dept Comp Sci Islamabad Pakistan Intl Ctr Wireless Collaborat Res Shanghai Peoples R China

ISBN: (纸本)9781424414932

Task scheduling is a vital and challenging task in distributed computing specially in grid computing. The computational grid focuses on large-scale resource sharing. Because of heterogeneous resources in widely distributed autonomous domains, which makes task scheduling even more challenging. In this paper, a hybrid and general resource algorithm for computational grid, MMOD is presented. MMOD, a general resource scheduling algorithm for computational grid is proposed for task scheduling with time-cost minimization and with maximum resource utilization. The experiments show the performance improvement for applications and better resource utilization by this algorithm raises the user satisfaction and minimizes time as well as cost.

关键词： grid computing computational grid computing resource scheduling

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Density functional theory based tight binding study on theoretical prediction of low-density nanoporous phases ZnO semiconductor materials 3

Density functional theory based tight binding study on theor...

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3rd international Workshop on Theoretical and Computational Physics - Complex systems and Interdisciplinary Physics (IWTCP) / 40th National conference on Theoretical Physics (NCTP)

作者： Vu Ngoc Tuoc Tran Doan Huan Nguyen Viet Minh Nguyen Thi Thao Hanoi Univ Sci & Technol Inst Engn Phys 1 Dai Co Viet Rd Hanoi Vietnam Univ Connecticut Inst Mat Sci Storrs CT 06269 USA Hong Duc Univ 307 Le Lai Thanh Hoa City Vietnam

Polymorphs or phases-different inorganic solids structures of the same composition usually have widely differing properties and applications, thereby synthesizing or predicting new classes of polymorphs for a certain compound is of great significance and has been gaining considerable interest. Herein, we perform a density functional theory based tight binding (DFTB) study on theoretical prediction of several new phases series of II-VI semiconductor material ZnO nanoporous phases from their bottom-up building blocks. Among these, three phases are reported for the first time, which could greatly expand the family of II-VI compound nanoporous phases. We also show that all these generally can be categorized similarly to the aluminosilicate zeolites inorganic open-framework materials. The hollow cage structure of the corresponding building block ZnkOk (k= 9, 12, 16) is well preserved in all of them, which leads to their low-density nanoporous and high flexibility. Additionally the electronic wide-energy gap of the individual ZnkOk is also retained. Our study reveals that they are all semiconductor materials with a large band gap. Further, this study is likely to be the common for II-VI semiconductor compounds and will be helpful for extending their range of properties and applications

关键词： Nanoporous phases DFT II-VI semiconductor

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