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International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： P.T. Antonov D.G. Razsadov Computer Science and Engineering Dpt. TU Vama Bulgaria

In the majority of analytical and imitation models analyzing the processes of communication networks functioning, input streams are associated with the well known Poisson's model, describing the most unfavorable case of stationary random streams. In practice the input streams are characterized mainly with strong nonstationary processes, impacting the final results of modeling to a significant degree. Having this in mind this report presents an input stream model for simulation modeling and analysis of communication networks.

关键词： Communication networks Analytical models Telecommunication traffic Traffic control computer science Fractals Page description languages

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Context-sensitive content representation for static document

Context-sensitive content representation for static document

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Asia-Pacific Conference on Software engineering

作者： W.C. Chu Y.W. Chen J.N. Chen Dpt. of Computer Science and Information Engineering Tunghai University Taiwan Dpt. of Engineering Science National Cheng Kung University Taiwan

Due to the convenience of pervasive information environment, many people use various computing devices to perform plenty kinds of tasks. In the field of education, there are various applications to facilitate learner, especially for e-learning. However, some computing devices suffer from the limited resources and cannot accept rich information content. Therefore, the information content has to be tailored into different kinds of presentation depending on the types of computing devices. Context sensitivity is an application software system's ability to sense and analyze context from various sources. In this paper, we aim to customize static documents using context-sensitive middleware (CSM) to sense the computing device, and then using the agent-based parser to provide suitable content representation dynamically.

关键词： Application software Electronic learning Personal digital assistants Pervasive computing Middleware Embedded computing Web pages computer science computer science education Mobile computing

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Semantic web access prediction using WordNet

Semantic web access prediction using WordNet

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International Conference on Web engineering, ICWE 2009 Doctoral Consortium - In Conjunction with ICWE 2009

作者： Hapalova, Lenka Dpt. of Computer Science and Engineering Faculty of Electrical Engineering Czech Technical University in Prague Karlovo nám. 13 121 35 Prague 2 CZ Czech Republic

The user observed latency of retrieving Web documents is one of limiting factors while using the Internet as an information data source. Prefetching became important technique to reduce the average Web access latency. Existing prefetching methods are based predominantly on URL graphs. They use the graphical nature of HTTP links to determine the possible paths through a hypertext system. Although the URL graph-based approaches are effective in the prefetching of frequently accessed documents, few of them can pre-fetch those URLs that are rarely visited. In our paper we aim to propose a new prefetching algorithm that would increase the efficiency of Web prefetching and that will embody the new demands for Web personalisation and Web search assistance. The aim of the research is to design a system for web page prefetching. The system should use user's link path history in combination with the semantic path history. To enable this, semantically annotated web pages are necessary. We cannot rely on the web documents' creators thus one part of the work must be the design and implementation of simple annotator based on WordNet just for purposes of our research.

关键词： Hypertext systems

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A Probability Model for the Size of Investment Projects

A Probability Model for the Size of Investment Projects

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computer Modeling and Simulation, EMS, UKSIM European Symposium on FLAGGED

作者： Maurizio Naldi Dpt. of Computer Science and Civil Engineering Università di Roma Tor Vergata Rome Italy

ISBN: (纸本)9781509002078

Project size, as measured by the amount of investment required, is a relevant parameter to be used in project selection. The evaluation of a project portfolio must consider the variety of project sizes that may be met, so that a proper model should be adopted to describe that variety, especially for its use in simulation. In this paper, a log-normal probability model is suggested to describe the dispersion of project sizes within a project portfolio. The model is obtained on the basis of two real datasets spanning over ten years of observations, and after comparison with competing Gamma and Pareto models. The parameters of the log-normal model are provided as resulting from the best-fit procedure, and indications are also given for the values to use in a simulation study.

关键词： Portfolios Computational modeling Predictive models Data models Investment Probability density function Companies

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Develop a new mobile-optimized remote experiment application for mobile learning 123

Develop a new mobile-optimized remote experiment application...

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123rd ASEE Annual Conference and Exposition

作者： Lan, Qianlong Wang, Ning Chen, Xuemin Song, Gangbing Parsaei, Hamid R. Texas Southern University Dpt. of Computer Science United States Texas Southern University Department of Electrical and Computer Engineering United States United States Texas A and M University Department of Mechanical Engineering United States

As Mobile Learning (M-Learning) has had a great impact on online education, more and more mobile applications are designed and developed for the M-Learning. In this paper, a novel mobile-optimized application architecture is proposed to integrate the remote laboratory into mobile environment for the M-Learning. With this mobile optimized application architecture, the remote experiment applications can use a common codebase to deploy native-like applications on many different mobile platforms (such as, iOS, Android, Window Mobile, etc.). To demonstrate the effectiveness of proposed new architecture for M-Learning, an innovative remote networked Smart Vibration Platform (SVP) experiment is successfully implemented based on this new application architecture. This remote SVP experiment has been used in several engineering courses. © American Society for engineering Education, 2016.

关键词： E-learning

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When free riding is the best choice: The case of network charges for content providers

When free riding is the best choice: The case of network cha...

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International Conference on Network and Service Management

作者： Maurizio Naldi Giuseppe D'Acquisto Università di Roma Tor Vergata Dpt. of Computer Science and Civil Engineering Roma Italy

Content providers are often accused of free riding by exploiting the network to distribute their content without sharing their revenues with the network providers. In order to assess the correctness of such an accusation, we set up a game-theoretical model, where content providers releasing their contents for free and under the payment of a usage-based charge are both present. In this model, the network provider charges both content providers a usage-based charge (network charge) as well. The network provider and the paid content provider act as the players, using the respective retail prices as strategic leverages. Both the cases where network charges are set by the network provider and by a regulatory authority are examined. The Nash equilibrium is determined in a closed form. In a typical scenario, the solution represented by zero network charges maximizes both the network provider's revenues and the social welfare: free riding for content providers appears as the best choice under both the viewpoints of the selfish network provider and the regulatory authority.

关键词： Games Advertising Equations Network neutrality Conferences Nash equilibrium

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Camera calibration method for an automotive safety driving system

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Journal of Institute of Control, Robotics and Systems 2015年第7期21卷 621-626页

作者： Park, Jong-Seop Kim, Gi-Seok Roh, Soo-Jang Cho, Jae-Soo Dpt. of Computer Science and Engineering Korea University of Technology and Education Korea Republic of

This paper presents a camera calibration method in order to estimate the lane detection and inter-vehicle distance estimation system for an automotive safety driving system. In order to implement the lane detection and vision-based inter-vehicle distance estimation to the embedded navigations or black box systems, it is necessary to consider the computation time and algorithm complexity. The process of camera calibration estimates the horizon, the position of the car's hood and the lane width for extraction of region of interest (ROI) from input image sequences. The precision of the calibration method is very important to the lane detection and inter-vehicle distance estimation. The proposed calibration method consists of three main steps: 1) horizon area determination;2) estimation of the car's hood area;and 3) estimation of initial lane width. Various experimental results show the effectiveness of the proposed method. © ICROS 2015.

关键词： Vehicle safety

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Forecast Uncertainty in Procurement Decisions for Cloud Storage

Forecast Uncertainty in Procurement Decisions for Cloud Stor...

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International Conference on computer Modeling and Simulation, UKSIM

作者： Maurizio Naldi Dpt. of Computer Science and Civil Engineering Università di Roma Tor Vergata Roma Italy

In public vs. private solutions (i.e. Cloud vs. In-house, or leased vs. Owned) for storage, both alternatives have their pros and cons. Cloud storage can easily adapt to the company needs, but exhibits a higher unit cost than in-house solutions. On the other hand, if the company relies on its own storage equipment, it must periodically purchase it on the basis of forecasts, which may prove imprecise and lead to idle equipment. In this paper, we propose a comparative evaluation tool for the two procurement approaches, where the cloud can play the role of either exclusive storage medium or supplement to in-house equipment (in the case of underestimation of storage needs). The tool considers the impact of equipment acquisition intervals and forecast accuracy over a long time horizon, adopting a Geometric Brownian Motion model for the evolution of storage capacity needs, it can be employed as a decision support tool for procurement decisions.

关键词： Cloud computing Companies Procurement Market research Stochastic processes Mathematical model Computational modeling

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Deployment of a LoRa-based Network and Web Monitoring Application for a Smart Farm

Deployment of a LoRa-based Network and Web Monitoring Applic...

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Workshop on Metrology for Industry 4.0 and IoT

作者： Mohamed Saban Otman Aghzout Alfredo Rosado-Muñ oz Dpt. Electronic Engineering ETSE School of Engineering Burjassot Spain Dpt. Computer Science ENSA School of Engineering Tetouan Morocco

The integration of Industry 4.0 technologies in agriculture will reduce the increasing challenges of agricultural process around the globe. The real-time farm management with high degree of automation will greatly improve productivity, agri-food supply chain efficiency and food safety. This paper describes a fully customized LoRa-based IoT system that aims for a low-cost, low power and wide range wireless sensor network targeted for smart farms. The presented system integrates already existing Programmable Logic Controllers (PLC) typically used to control multiple processes and devices such as water pumps, certain machinery, etc. along with a newly developed network of wireless LoRA sensors distributed over the farm. A Telegram bot is also included as novelty for automated user communication via this mobile phone messaging application. The network structure was deployed and tested. The developed integrated system also includes a cloud-based monitoring application to provide remote visualization and control for all the farming environment.

关键词： Smart agriculture Wireless communication Temperature sensors Temperature measurement Wireless sensor networks Process control Water pumps

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A robust Carrier Frequency and Timing Offset Estimation in Inter-UAV OFDM Communication Links

A robust Carrier Frequency and Timing Offset Estimation in I...

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International Multi-Topic ICT Conference (IMTIC)

作者： Farzana Kulsoom Iraj Fatima Hassan Nazeer Chaudhry Aneeqa Gul Adeel Akram Telecommunication Engineering Dpt. University of Engineering and Technology Taxila Pakistan Computer Science Dpt. Barani Institute of Technology Rawalpindi Pakistan

The UAV-mounted base station has been integrated into 5G and beyond to provide communication in an emergency when conventional systems fail due to some reason. Moreover, it is also used in coverage enhancement and for other strategic purposes. In this work, we have considered a MIMO-OFDM based UAV system that is inclined to fast-fading channels due to the continuous motion of UAVs. Due to the mobility of UAVs, there is a frequency and timing offset which must be estimated for proper and seamless communication. For that purpose, we have proposed a data-aided maximum likelihood-based scheme that efficiently estimates the carrier frequency and timing offset. Results show that our algorithm outperforms the state-of-the-art system in terms of MSE.

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