Página 31 dos resultados de 2566 itens digitais encontrados em 0.050 segundos

Minimum Grounded Component Based Voltage-Mode Quadrature Oscillator using DVCC

Mohan, J.; Maheshwari, S.; Chauhan, D. S.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 09/10/2012 Português
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In this paper, a new voltage-mode quadrature oscillator using minimum number of active and passive component is proposed. The proposed circuit employs single modified DVCC, two grounded capacitor and two grounded resistors, which is ideal for IC implementation. The active and passive sensitivity are no more than unity. The proposed circuit is verified through PSPICE simulation results.; Comment: International Journal on Recent Trends in Engineering & Technology, vol.3, issue 4, 2010

Application of polynomial vector (pv) processing to improve the estimation performance of bio diesel in variable compression ratio diesel engine

Suresh, M.; Dutta, Maheswar; Purushothaman, S.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 16/12/2012 Português
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This paper presents the implementation of polynomial vector back propagation algorithm (PVBPA) for estimating the power, torque, specific fuel consumption and presence of carbon monoxide, hydrocarbons in the emission of a direct injection diesel engine. Experimental readings were obtained using the biodiesel prepared form the waste low quality cooking oil collected from the canteen of Sri Sairam Engineering College, India.. This waste cooking oil was due to the preparation of varieties of food (vegetables fried and non vegetarian). Over more than a week, trans esterification was done in chemical lab and the biodiesel was obtained. The biodiesel was mixed in proportions of 10%, 20%, 30%, 40%, 50% with remaining combinations of the diesel supplied by the Indian government. Variable compression ratio (VCR) diesel engine with single cylinder, four stroke diesel type was used. The outputs of the engine as power, torque and specific fuel consumption were obtained from the computational facility attached to the engine. The data collected for different input conditions of the engine was further used to train (PVBPA). The trained PVBPA network was further used to predict the power, torque and brake specific fuel consumption (SFC) for different speed...

An Integrated Geographic Information System and Marketing Information System Model

Kester, Quist-Aphetsi; Koumadi; M, Koudjo; Quaynor, Nii Narku
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 29/07/2013 Português
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Maintaining competitive advantage is significant in this present day of globalization, knowledge management and enormous economic activities. An organization's future developments are influenced by its managements' decisions. Businesses today are facing a lot of challenges in terms of competition and they have to be in the lead by strengthening their research and development strategies with the aid of cutting edge technologies. Hence marketing intelligence is now a key to the success of any business in today's rapidly changing business environment. With all the technologies available in marketing research, businesses still struggle with how to gather information and make decisions in a short time and real-time about their customers' needs and purchasing patterns in various geographical areas. This paper is set out to contribute to the body of knowledge in the area of the application of Geographic Information Systems technology solutions to businesses by developing a model for integrating Geographic Information Systems into existing Marketing Information Systems for effective marketing research. This model will interconnect organizations at the highest levels, providing reassurance to enable broad scope of checks and balances as well as benefiting many business activities including operational...

Scheduling Cutting Process for Large Paper Rolls

Aydin, Mehmet E.; Taylan, Osman
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 07/04/2013 Português
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Paper cutting is a simple process of slicing large rolls of paper, jumbo-reels, into various sub-rolls with variable widths based on demands risen by customers. Since the variability is high due to collected various orders into a pool, the process turns to be production scheduling problem, which requires optimisation so as to minimise the final remaining amount of paper wasted. The problem holds characteristics similar one-dimensional bin-packing problem to some extends and differs with some respects. This paper introduces a modelling attempt as a scheduling problem with an integer programming approach for optimisation purposes. Then, a constructive heuristic algorithm revising one of well-known approaches, called Best-fit algorithm, is introduced to solve the problem. The illustrative examples provided shows the near optimum solution provided with very low complexity .; Comment: Academic Platform Journal of Engineering and Science, 2013

Being, space and time in the Web

Vafopoulos, Michalis
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
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The Web initially emerged as an "antidote" to accumulated scientific knowledge since it enables global representation and communication with minimum costs. Its gigantic scale and interdependence incommode our ability to find relevant information and develop trustworthy contexts. It is time for science to compensate by providing an epistemological "antidote" to Web issues. Philosophy should be in the front line by forming the salient questions and analysis. The scope of our research is to provide a theory about the Web being that will bridge philosophical thinking and engineering. We analyze existence and spatiotemporality in the Web and how it transforms the traditional actualities. The Web space is specified by incoming and outgoing links. The primordial role of visiting durations in Web's existence is approximated by Bergsonian time. The physical space becomes more discoverable. The human activity can be asynchronous, synchronous and continuous. Networked individuals operate in a flexible and spatially dispersed environment. The resulting issues concern the self-determination of a being and the way in which the Web could be a free and open platform for innovation and participation.

Cloud Computing For Microfinances

V, Suma.; Deshpande, Bhagavant; M, Vaidehi.; Nair, T. R. Gopalakrishnan
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 12/04/2012 Português
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Evolution of Science and Engineering has led to the growth of several commercial applications. The wide spread implementation of commercial based applications has in turn directed the emergence of advanced technologies such as cloud computing. India has well proven itself as a potential hub for advanced technologies including cloud based industrial market. Microfinance system has emerged out as a panacea to Indian economy since the population encompasses of people who come under poverty and below poverty index. However, one of the key challenges in successful operation of microfinance system in India has given rise to integration of financial services using sophisticated cloud computing model. This paper, therefore propose a fundamental cloud-based microfinance model in order to reduce high transaction risks involved during microfinance operations in an inexpensive and efficient manner.; Comment: 3 Pages, 2 Figures, International Conference On Systemics, Cybernetics and Informatics

Computer simulations reveal complex distribution of haemodynamic forces in a mouse retina model of angiogenesis

Bernabeu, Miguel O.; Jones, Martin; Nielsen, Jens H.; Krüger, Timm; Nash, Rupert W.; Groen, Derek; Schmieschek, Sebastian; Hetherington, James; Gerhardt, Holger; Franco, Claudio A.; Coveney, Peter V.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
36.776929%
There is currently limited understanding of the role played by haemodynamic forces on the processes governing vascular development. One of many obstacles to be overcome is being able to measure those forces, at the required resolution level, on vessels only a few micrometres thick. In the current paper, we present an in silico method for the computation of the haemodynamic forces experienced by murine retinal vasculature (a widely used vascular development animal model) beyond what is measurable experimentally. Our results show that it is possible to reconstruct high-resolution three-dimensional geometrical models directly from samples of retinal vasculature and that the lattice-Boltzmann algorithm can be used to obtain accurate estimates of the haemodynamics in these domains. We generate flow models from samples obtained at postnatal days (P) 5 and 6. Our simulations show important differences between the flow patterns recovered in both cases, including observations of regression occurring in areas where wall shear stress gradients exist. We propose two possible mechanisms to account for the observed increase in velocity and wall shear stress between P5 and P6: i) the measured reduction in typical vessel diameter between both time points...

Visual and Predictive Analytics on Singapore News: Experiments on GDELT, Wikipedia, and ^STI

Phua, Clifton; Feng, Yuzhang; Ji, Junyao; Soh, Timothy
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 07/04/2014 Português
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The open-source Global Database of Events, Language, and Tone (GDELT) is the most comprehensive and updated Big Data source of important terms extracted from international news articles . We focus only on GDELT's Singapore events to better understand the data quality of its news articles, accuracy of its term extraction, and potential for prediction. To test news completeness and validity, we visually compared GDELT (Singapore news articles' terms from 1979 to 2013) to Wikipedia's timeline of Singaporean history. To test term extraction accuracy, we visually compared GDELT (CAMEO codes and TABARI system of extraction from Singapore news articles' text from April to December 2013) to SAS Text Miner's term and topic extraction. To perform predictive analytics, we propose a novel feature engineering method to transform row-level GDELT from articles to a user-specified temporal resolution. For example, we apply a decision tree using daily counts of feature values from GDELT to predict Singapore stock market's Straits Times Index (^STI). Of practical interest from the above results is SAS Visual Analytics' ability to highlight the various impacts of June 2013 Southeast Asian haze and December 2013 Little India riot on Singapore. Although Singapore is unique as a sovereign city-state...

Technology For Information Engineering (TIE): A New Way of Storing, Retrieving and Analyzing Information

Lewak, Jerzy
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 16/04/2002 Português
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The theoretical foundations of a new model and paradigm (called TIE) for data storage and access are introduced. Associations between data elements are stored in a single Matrix table, which is usually kept entirely in RAM for quick access. The model ties together a very intuitive "guided" GUI to the Matrix structure, allowing extremely easy complex searches through the data. Although it is an "Associative Model" in that it stores the data associations separately from the data itself, in contrast to other implementations of that model TIE guides the user to only the available information ensuring that every search is always fruitful. Very many diverse applications of the technology are reviewed.; Comment: 32 pages. Introduces the theoretical foundation for associative information

Scalable, Robust and Real Time Communication Architecture For Wireless Sensor Networks

Virmani, Deepali; Jain, Satbir
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 22/04/2013 Português
Relevância na Pesquisa
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In this paper we propose wireless sensor network architecture with layered protocols, targeting different aspects of the awareness requirements in wireless sensor networks. Under such a unified framework, we pay special attention to the most important awareness issues in wireless sensor networks: namely dynamic awareness, energy awareness and spatiotemporal awareness. First, we propose the spatiotemporal aware routing protocol for wireless sensor networks, which maintains a constant delivery speed for soft real-time communication. Second, we introduce the time-energy aware aggregation scheme, which increases the degree of aggregation and reduces energy consumption without jeopardizing the end-to-end delay. It is the data aggregation scheme to take the timely delivery of messages as well as protocol overhead into account to adjust aggregation strategies adaptively in accordance with assessed traffic conditions and expected wireless sensor network requirements. Third, we also deal with dynamic awareness by proposing a new communication category based on a lazy-binding concept. The evaluation of this integrated architecture demonstrates its performance composability and its capability to be tailored for applications with different awareness requirements. We believe that the integrated architecture...

Analysis of SVN Repositories for Remote Access

Sadaf; Soomro, Safeeullah; Abbasi, Suhni
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 20/11/2015 Português
Relevância na Pesquisa
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Software Evolution is considered to be essential and challenging characteristic in the field of software engineering. Version control system is an incremental versions tracking system, introduced to avoid unnecessary overwriting of files such as programming code, web pages and records. It also helps to decrease the confusion affected by duplicate or outdated data. In this proposed research SVN repository is maintained and analyzed for msitone.wikispaces.com to minimize the efforts as well as resources for the future users. We have used two semester data for the analysis purpose that is observed SVN repository. The result shows that, implementing the SVN repositories are helpful for maintenance of the Wikispaces as it also reduce the cost, time and efforts for their evolution. Whereas without implementing the SVN repositories Wikispaces were just supposed to be building the house by putting each brick from start.

Distributed Transformer Monitoring System Based On Zigbee Technology

Pandey, Rakesh Kumar; Kumar, Dilip
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 14/03/2014 Português
Relevância na Pesquisa
36.776929%
A Distributed transformer networks remote monitoring system is developed and constructed,for monitor and record the parameters like temperature, oil level status, of a distribution transformer.The system consists of a micro controller based circuit,with solid-state components for handling sensors,power back-up,real time clock and data communication module which based on ZigBee protocol.; Comment: 3 Pages, 5 Figures, International Journal of Engineering Trends and Technology (IJETT)-Volume4 Issue5-May (2013)

A Novel Hybrid Algorithm for Permutation Flow Shop Scheduling

Kumar, Sandeep; Jadon, Pooja
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 21/07/2014 Português
Relevância na Pesquisa
36.776929%
In the present scenario the recent engineering and industrial built-up units are facing hodgepodge of problems in a lot of aspects such as machining time, electricity, man power, raw material and customers constraints. The job-shop scheduling is one of the most significant industrial behaviours, particularly in manufacturing planning. This paper proposes the permutation flow shop sequencing problem with the objective of makespan minimization using the new modified proposed method of johnsons algorithm as well as the guptas heuristic algorithm. This paper involves the determination of the order of processing of n jobs in m machines. Although since the problem is known to be np-hard for three or more machines, that produces near optimal solution of the given problem. The proposed method is very simple and easy to understand followed by a numerical illustration is given.

Informatics Perspectives on Decision Taking, a Case Study on Resolving Process Product Ambiguity

Bergstra, J. A.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
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A decision is an act or event of decision taking. Decision making always includes decision taking, the latter not involving significant exchanges with non-deciding agents. A decision outcome is a piece of storable information constituting the result of a decision. Decision outcomes are typed, for instance: plan, command, assertion, or boolean reply to a question. Decision outcomes are seen by an audience and autonomous actions from the audience is supposed to realize the putting into effect of a decision outcome, thus leading to so-called decision effects. Decision outcomes are supposedly expected by the decider. Using a model or a theory concerning the causal chain leading from a decision outcome to one or more decision effects may support a decision taker decision taker in predicting plausible decision effects for candidate decision outcomes. Decision taking is positioned amidst many related notions including: decision making, decision process, decision making process, decision process making, decision engineering, decision progression, and decision progression production.; Comment: First revision; many minior improvements have been made, concluding section has been replaced

Integrated Design and Implementation of Embedded Control Systems with Scilab

Ma, Longhua; Xia, Feng; Peng, Zhe
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 29/09/2008 Português
Relevância na Pesquisa
36.776929%
Embedded systems are playing an increasingly important role in control engineering. Despite their popularity, embedded systems are generally subject to resource constraints and it is therefore difficult to build complex control systems on embedded platforms. Traditionally, the design and implementation of control systems are often separated, which causes the development of embedded control systems to be highly time-consuming and costly. To address these problems, this paper presents a low-cost, reusable, reconfigurable platform that enables integrated design and implementation of embedded control systems. To minimize the cost, free and open source software packages such as Linux and Scilab are used. Scilab is ported to the embedded ARM-Linux system. The drivers for interfacing Scilab with several communication protocols including serial, Ethernet, and Modbus are developed. Experiments are conducted to test the developed embedded platform. The use of Scilab enables implementation of complex control algorithms on embedded platforms. With the developed platform, it is possible to perform all phases of the development cycle of embedded control systems in a unified environment, thus facilitating the reduction of development time and cost.; Comment: 15 pages...

An embedded system for real-time feedback neuroscience experiments

de Almeida, Lirio Onofre Baptista; Matias, Paulo; Guariento, Rafael Tuma
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 03/04/2015 Português
Relevância na Pesquisa
36.776929%
A complete data acquisition and signal output control system for synchronous stimuli generation, geared towards in vivo neuroscience experiments, was developed using the Terasic DE2i-150 board. All emotions and thoughts are an emergent property of the chemical and electrical activity of neurons. Most of these cells are regarded as excitable cells (spiking neurons), which produce temporally localized electric patterns (spikes). Researchers usually consider that only the instant of occurrence (timestamp) of these spikes encodes information. Registering neural activity evoked by stimuli demands timing determinism and data storage capabilities that cannot be met without dedicated hardware and a hard real-time operational system (RTOS). Indeed, research in neuroscience usually requires dedicated electronic instrumentation for studies in neural coding, brain machine interfaces and closed loop in vivo or in vitro experiments. We developed a complete embedded system solution consisting of a hardware/software co-design with the Intel Atom processor running a free RTOS and a FPGA communicating via a PCIe-to-Avalon bridge. Our system is capable of registering input event timestamps with 1{\mu}s precision and digitally generating stimuli output in hard real-time. The whole system is controlled by a Linux-based Graphical User Interface (GUI). Collected results are simultaneously saved in a local file and broadcasted wirelessly to mobile device web-browsers in an user-friendly graphic format...

Mathematical Models in Danube Water Quality

Antohe, Valerian; Stanciu, Constantin
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 27/05/2009 Português
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The mathematical shaping in the study of water quality has become a branch of environmental engineering. The comprehension and effective application of mathematical models in studying environmental phenomena keep up with the results in the domain of mathematics and the development of specialized software as well. Integrated software programs simulate and predict extreme events, propose solutions, analyzing and processing data in due time. This paper presents a browsing through some mathematical categories of processing the statistical data, examples and their analysis concerning the degree of water pollution downstream the river Danube.; Comment: 10 pages, exposed on 5th International Conference "Actualities and Perspectives on Hardware and Software" - APHS2009, Timisoara, Romania

Web application for size and topology optimization of trusses and gusset plates

Krishnamoorthi, Shankarjee; Srivastava, Gaurav; Mandhyan, Amar
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 08/12/2015 Português
Relevância na Pesquisa
36.776929%
With its ever growing popularity, providing Internet based applications tuned towards practical applications is on the rise. Advantages such as no external plugins and additional software, ease of use, updating and maintenance have increased the popularity of web applications. In this work, a web-based application has been developed which can perform size optimization of truss structure as a whole as well as topology optimization of individual gusset plate of each joint based on specified joint displacements and load conditions. This application is developed using cutting-edge web technologies such as Three.js and HTML5. The client side boasts of an intuitive interface which in addition to its modeling capabilities also recommends configurations based on user input, provides analysis options and finally displays the results. The server side, using a combination of Scilab and DAKOTA, computes solution and also provides the user with comparisons of the optimal design with that conforming to Indian Standard (IS 800-2007). It is a freely available one-stop web-based application to perform optimal and/or code based design of trusses.; Comment: 17 pages, 8 figures, submitted to Structural Engineering and Mechanics

Universal Regular Autonomous Asynchronous Systems: Fixed Points, Equivalencies and Dynamic Bifurcations

Vlad, Serban E.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
36.776929%
The asynchronous systems are the non-deterministic models of the asynchronous circuits from the digital electrical engineering. In the autonomous version, such a system is a set of functions x:R{\to}{0,1}^{n} called states (R is the time set). If an asynchronous system is defined by making use of a so called generator function {\Phi}:{0,1}^{n}{\to}{0,1}^{n}, then it is called regular. The property of universality means the greatest in the sense of the inclusion. The purpose of the paper is that of defining and of characterizing the fixed points, the equivalencies and the dynamical bifurcations of the universal regular autonomous asynchronous systems. We use analogies with the dynamical systems theory.; Comment: 21 pages, 11 figures, ROMAI Journal, Vol. 5, Nr. 1, 2009

The decomposition of the regular asynchronous systems as parallel connection of regular asynchronous systems

Vlad, Serban E.
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 20/06/2012 Português
Relevância na Pesquisa
36.776929%
The asynchronous systems are the non-deterministic models of the asynchronous circuits from the digital electrical engineering, where non-determinism is a consequence of the fact that modelling is made in the presence of unknown and variable parameters. Such a system is a multi-valued function f that assigns to an (admissible) input u:R{\to}{0,1}^{m} a set f(u) of (possible) states x:R{\to}{0,1}^{n}. When this assignment is defined by making use of a so-called generator function {\Phi}:{0,1}^{n}{\times}{0,1}^{m}{\to}{0,1}^{n}, then the asynchronous system f is called regular. The generator function {\Phi} acts in this asynchronous framework similarly with the next state function from a synchronous framework. The parallel connection of the asynchronous systems f' and f" is the asynchronous system (f'||f")(u)=f'(u){\times}f"(u). The purpose of the paper is to give the circumstances under which a regular asynchronous system f may be written as a parallel connection of regular asynchronous systems.; Comment: 13 pages, the Proceedings of ICTAMI, Alba Iulia, September 3-6, 2009