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Computational Science and Its Applications (ICCSA), 2012 12th International Conference on

Date 18-21 June 2012

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Displaying Results 1 - 25 of 47
  • [Cover art]

    Publication Year: 2012 , Page(s): C4
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  • [Title page i]

    Publication Year: 2012 , Page(s): i
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  • [Title page iii]

    Publication Year: 2012 , Page(s): iii
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  • [Copyright notice]

    Publication Year: 2012 , Page(s): iv
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  • Table of contents

    Publication Year: 2012 , Page(s): v - vii
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  • Message from the General Chairs

    Publication Year: 2012 , Page(s): viii
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  • Message from the Local Organizing Committee Chair

    Publication Year: 2012 , Page(s): ix
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  • Conference Organization

    Publication Year: 2012 , Page(s): x - xv
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  • Message from the FISTA 2012 Chairs

    Publication Year: 2012 , Page(s): xvi
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  • Message from the TTSDP 2012 Chair

    Publication Year: 2012 , Page(s): xvii - xviii
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  • Message from the QMCSA 2012 Chairs

    Publication Year: 2012 , Page(s): xix
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  • Sponsors

    Publication Year: 2012 , Page(s): xx - xxii
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  • A Scheduler for Grid Task Based on Differential Evolution Algorithm and Robust to Uncertainty Communication Demand of the Application

    Publication Year: 2012 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (222 KB) |  | HTML iconHTML  

    The grid schedulers are responsible for deciding how to divide the tasks on the grid hosts in order to achieve the best possible performance. The lack of user's knowledge about the applications' demands do the informations received by the schedulers differ from the actual values that should be considered to achieve nearly optimal scheduling. This paper introduces a robust task scheduler to uncertainties in the description of the communication demands of the application. The robustness of scheduler is evaluated using simulations based on real grid applications. The schedules generated by schedulers robust to uncertainties were compared with schedules generated by schedulers that considers the information input are always correct. The robust uncertainties schedulers presented themselves useful before scenarios with a high degree of uncertainty. View full abstract»

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  • A Web Service-based Framework for Temporal/Spatial Environmental Data Access

    Publication Year: 2012 , Page(s): 7 - 13
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (553 KB) |  | HTML iconHTML  

    The Weather Forecast and Climate Studies Center (CPTEC) of the Brazilian National Institute for Space Research (INPE) is responsible for weather and climate forecasts and weather data collection and dissemination. Data is collected from several different systems and networks, with different sensors and features. Data is available through the Institute's web site through searchable web pages, which allows the easy retrieval of small amounts of information stored on the servers at a time, but only for a specific type of data (e.g. sensor). Although they serve their main purpose, these interfaces present limited usability: if an user needs to create a composite query involving different sensors or even different temporal/spatial slices of the data, this user will need to perform several queries while storing the intermediate results. In this paper we present a framework to access data and metadata stored in CPTEC's server that allows composition of complex queries through web services. These web services cover several different data sources, allowing the exploration of the data in ways not considered by the institute. Some simple case studies and first results are demonstrated. View full abstract»

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  • Ad-Hoc Buffering in Neighbor Nodes for Burst Data Transmissions in Wireless Sensor Networks

    Publication Year: 2012 , Page(s): 14 - 19
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (645 KB) |  | HTML iconHTML  

    In sensor networks, burst sensor messages are required to be transmitted along a wireless multihop routes to a sink node with no lost sensor messages and with shorter transmission delay. However, due to congestions, buffers in intermediate sensor nodes around the sink node overflow. In addition, buffers in other intermediate sensor nodes are also overflow since an intermediate node Ni is an exposed node of a next-hop node Ni+1, a previous-hop node Ni-1 is an exposed node of Ni and Ni-2 and Ni+2 are hidden nodes of Ni. Thus, contentions among these nodes cause less transmission opportunities and buffers in Ni may overflow. In order to reduce such buffer overflow, this paper proposes (1) a method for notification of a filled buffer to the previous-hop node and (2) a method for forwarding sensor messages to a pseudo next-hop node Ni+1 which is a neighbor node of Ni and Ni+2 for reduction of lost sensor messages and for shorter transmission delay. View full abstract»

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  • Towards an Adaptive Workflow with Multi-Agents in a Semantic Grid

    Publication Year: 2012 , Page(s): 20 - 25
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (324 KB) |  | HTML iconHTML  

    Semantic grid computing provides a shared computing environment with geographically distributed resources. These resources status changes dynamically and the type of applications to be executed also changes in time. In this paper, we proposed an adaptive mechanism in the semantic grid environment to reduce the efforts to configure and enact application workflows. Some applications were used to describe the proposed mechanism and as a proof-of-concept. Preliminary results provide insights on workflow verification issues and applications workflow. View full abstract»

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  • A Survey: Soft Computing in Intelligent Information Retrieval Systems

    Publication Year: 2012 , Page(s): 26 - 34
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (289 KB) |  | HTML iconHTML  

    This paper provides an in-depth survey of challenges in the design of intelligent information retrieval systems, pointing out some similarities and differences in the core data mining and web based search operations. The procedures for evaluation of search engine performance and implicit feedback of the user with respect to a search result are studied with references to the different algorithms. We have proposed a novel neural satisfaction based feedback vector in contrast to the existing activity pattern based feedback as a future research direction in Intelligent IR. We addressed the select research work in the area of soft information retrieval using fuzzy sets, artificial neural networks, genetic algorithms and probabilistic information retrieval. As an instance of information retrieval, web mining is a set of operations to retrieve relevant documents from preprocessed, crawled and indexed web, and it can be categorized into more specialized tasks of web content mining, web structure mining and web usage mining. We have given a survey of the important reviews on topic of web mining and its associated tasks. On the basis of Identified challenges in information retrieval in general, and web mining in particular, we have concentrated on applicability of soft computing techniques and their hybrids in web mining, the performance related issues of select solutions, future of web mining and the next generation user's expectations from a search engine. View full abstract»

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  • High-Level Specification and Code Generation for Service-Oriented Tool Adapters

    Publication Year: 2012 , Page(s): 35 - 42
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (178 KB) |  | HTML iconHTML  

    The development of complex systems requires tool support for the different phases of the system life cycle. To allow for an efficient development process, the involved tools need to be integrated, e.g. by exchanging tool data or providing trace ability between the data. Despite the availability of tool integration platforms and frameworks, it is labor-intensive and costly to build tool integration solutions. Industrial tool integration initiatives such as OSLC (Open Services for Lifecycle Collaboration) demand complex configurations and the adherence to integration standards. This further complicates building an integration solution. We propose an approach that uses formalized specifications to systematize tool integration and specialized code generators to automate the process of building tool adapters. We evaluate our approach with the implementation of a code generator that creates service-oriented tool adapters conforming to the OSLC industry initiative. View full abstract»

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  • Indexing Structured Documents with Suffix Arrays

    Publication Year: 2012 , Page(s): 43 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (207 KB) |  | HTML iconHTML  

    Path indexes based on suffix trees have shown to be highly efficient structures when dealing with digital collection that consists of structured documents, since they provide a fast response to queries including structural requirements. Nevertheless, when the collection consists of highly heterogeneous documents, suffix trees may be too memory demanding. In such cases, the use of a suffix array as the underlying data storage permits a considerable reduction in space requirements, partially because suffix arrays are a remarkably light data structure and partially because they do not store redundant information regarding the textual content. We describe how a suffix array can be used as the data structure which stores the structural index in a retrieval system and provides a virtual index of all sub paths in the digital collection. We also show how an auxiliary ternary search tree can accelerate the resolution of structural queries with only a marginal increase in memory usage. View full abstract»

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  • Parallelism as a Concern in Java through Fork-join Synchronization Patterns

    Publication Year: 2012 , Page(s): 49 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    We are facing a hardware revolution given by the increasing availability of multicore computers, clusters, Grids, and combinations of these. Consequently, there is plenty of computational power, but today's programmers are not fully prepared to exploit parallelism and distribution. Particularly, Java has helped in handling the heterogeneity of such environments, but there is a lack of facilities to easily and elegantly parallelizing applications. One path to this end seems to be the synthesis of semi-automatic parallelism and Parallelism as a Concern (PaaC). We briefly survey relevant Java-based parallel development tools, identify their drawbacks, and discuss some insights of an ongoing approach for mitigating them. View full abstract»

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  • An Extensive Theoretical Study for the CN + C2H4 Reaction

    Publication Year: 2012 , Page(s): 57 - 62
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (335 KB) |  | HTML iconHTML  

    An extensive quantum chemical study of the potential energy surface (PES) for the different pathways of the reaction of CN + C2H4 is reported. Critical geometries of this reaction were optimized at M06L and CCSD/Aug-cc-pVDZ levels of theory. The theoretical rate constants are also calculated for the main reaction pathway using the transition state theory. The predicted values are in good agreement with the experimental results. View full abstract»

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  • Bio-Inspired Diffusion Based Molecular Communication in Long-range

    Publication Year: 2012 , Page(s): 63 - 66
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (519 KB) |  | HTML iconHTML  

    The scale limitations of conventional silicon based electromagnetic systems and the potential benefits of nanoscale devices, have spurred significant interest in studying nano-scale computation, electronics and communication. Nanonetworks, the interconnection of nanomachines, provide the means for cooperation and information sharing among tiny nanomachines, allowing them to fulfill more complex tasks. The ability to create communication networks of biological nanoscale devices has the potential to open up new opportunities and applications, particularly in areas such as health care. Inspired by recent developments in molecular communication and biomolecular computing, we present in this paper a biological pheromone based molecular communication transmitting platform. We investigated the communication process of this long-range channel and simulate its performance with real human body parameters to illustrate the functionality and performance of this biological communication technique. View full abstract»

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  • A SAPT Study of the H2O X2 Complexes; X = H, N and F

    Publication Year: 2012 , Page(s): 67 - 76
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (274 KB) |  | HTML iconHTML  

    The interaction energy of the H2O⋯X2 complexes, with X = H, N and F has been analyzed by using the SAPT (Symmetry Adapted Perturbation Theory) methodology. The decomposition of the interaction energy into distinct physical components is a unique feature of SAPT which distinguishes this method from the super molecular approach. In SAPT, the interaction energy is expressed as a sum of perturbative corrections, each correction resulting from different physical effect. SAPT results show that the above systems possess quite different features, while the complex with hydrogen is dominated by dispersion, a subtle balance of dispersion and induction is effective in stabilizing the complex H2O⋯N2, and induction (due to the strong electro negativity of fluorine) is the leading term in the pre-reactive vdW complex H2O⋯F2. View full abstract»

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  • Umbrella Inversion Processes. Disentanglement of the Vibration-rotation Problem and Eigenfunctions

    Publication Year: 2012 , Page(s): 77 - 82
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (184 KB) |  | HTML iconHTML  

    The umbrella inversion mode is a large amplitude motion characteristic of four atom molecules of type AB3 (such as ammonia and the hydronium ion) and is a mechanism for chirality inversion of pyramidal molecules. A reduced dimension approach to the modelling of the umbrella inversion can be obtained by enforcing C3v symmetry, that is the minimum symmetry group of the equilibrium configuration of the AB3 systems. The conservation of the C3v symmetry along the inversion path, is obtained working with a particular hyper spherical representation. View full abstract»

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  • Method for Counting Microorganisms and Colonies in Microscopic Images

    Publication Year: 2012 , Page(s): 83 - 87
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1085 KB) |  | HTML iconHTML  

    This paper presents a method to count microorganisms and colonies in microscopic images. The method uses a series of morphological operations to create a representation in which the objects of interest are easily isolated and counted. The proposal is successful in most cases, properly dealing with some difficult situations like when the sizes of the objects vary strongly and when there is low contrast between the objects and the background. Studies are underway in order to improve the performance of the method when dealing with strongly merged objects. View full abstract»

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