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Selected Works

2012

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Articles 421 - 432 of 432

Full-Text Articles in Engineering

What Is Your Intention? Communicating Routes In Electronic Nautical Charts, Thomas Porathe, Margareta Lützhöft, Gesa Praetorius Dec 2011

What Is Your Intention? Communicating Routes In Electronic Nautical Charts, Thomas Porathe, Margareta Lützhöft, Gesa Praetorius

Gesa Praetorius

This paper reports preliminary findings on a simulator study looking for unintended consequences of letting ships exchange routs by use of the Electronic Chart Display and Information System (ECDIS). In a prototype system tested ship's intended routes are visible to other ships, and the Vessel Traffic Service (VTS) has the ability to send suggested routes to addressed ships. Preliminary findings show positive response from professional participants in the study although some concerns were also raised.

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Integrated Methods For Optimization, 2nd Ed, John Hooker Dec 2011

Integrated Methods For Optimization, 2nd Ed, John Hooker

John Hooker

No abstract provided.

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Decision Support For Vessel Traffic Service (Vts): User Needs For Dynamic Risk Management In The Vts, Gesa Praetorius Dec 2011

Decision Support For Vessel Traffic Service (Vts): User Needs For Dynamic Risk Management In The Vts, Gesa Praetorius

Gesa Praetorius

Vessel Traffic Service (VTS) is a shore-side service implemented by a “Competent Authority to improve the safety and efficiency of vessel traffic and to protect the environment”. It is a service that operates through VTS centers, from which VTS operators monitor traffic, assist in navigational matters and provide information to all ships in a designated area. As VTS is provided by operators located on shore, they usually make use of several decision support systems to be able to monitor the traffic and to provide information to the vessels. Although several new tools and approaches have been introduced in the VTS …

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Survivable Smart Grid Communication: Smart-Meters Meshes To The Rescue, Arjun Athreya, Patrick Tague Dec 2011

Survivable Smart Grid Communication: Smart-Meters Meshes To The Rescue, Arjun Athreya, Patrick Tague

Patrick Tague

Smart grids are critical cyber-physical infrastructures in the world now. Since these infrastructures are prone to large scale outages due to disasters or faults, a resilient and survivable communication architecture is desired. In this work, we propose a resilient and survivable hierarchical communication architecture for the smart grid that mirrors the hierarchy of the existing power grid. Post-disaster resilience in grid communication is achieved through the grid flattening process. This process involves smart-meters and other disaster surviving elements of higher system levels of the grid forming a wireless mesh network. The flattened network of grid elements with one-hop communication links …

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Inventory Planning And Coordination In Disaster Relief Efforts, Lauren Davis, Funda Samanlioglu, Xiuli Qu, Sarah Root Dec 2011

Inventory Planning And Coordination In Disaster Relief Efforts, Lauren Davis, Funda Samanlioglu, Xiuli Qu, Sarah Root

Dr. Lauren B Davis

This research proposes a stochastic programming model to determine how supplies should be positioned and distributed among a network of cooperative warehouses. The model incorporates constraints that enforce equity in service while also considering traffic congestion resulting from possible evacuation behavior and time constraints for providing effective response. We make use of short-term information (e.g., hurricane forecasts) to more effectively preposition supplies in preparation for their distribution at an operational level. Through an extensive computational study, we characterize the conditions under which prepositioning is beneficial, as well as discuss the relationship between inventory placement, capacity and coordination within the network.

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A Hybrid Tabu Search And Constraint Programming Algorithm For The Dynamic Dial-A-Ride Problem, Gerardo Berbeglia Dec 2011

A Hybrid Tabu Search And Constraint Programming Algorithm For The Dynamic Dial-A-Ride Problem, Gerardo Berbeglia

Gerardo Berbeglia

No abstract provided.

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Production Of Granola Breakfast Cereal By Fluidised Bed Granulation, Pankaj Pathare Dec 2011

Production Of Granola Breakfast Cereal By Fluidised Bed Granulation, Pankaj Pathare

Pankaj B Pathare

In the fluidised bed granulation process the effect of nozzle air pressure and binder spray rate on key aggregate quality attributes were studied. The experimental results show that a decrease in nozzle air pressure leads to larger mean granule size. The combination of lowest nozzle air pressure and lowest binder spray rate results in granules with the highest levels of hardness and crispness. The combination of low nozzle air pressure and low binder spray rate results in the least distribution span. Granola hardness was affected by nozzle air pressure. Nozzle air pressure and binder spray rate did not have significant …

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Toward Unification Of Exact And Heuristic Optimization Methods, John Hooker Dec 2011

Toward Unification Of Exact And Heuristic Optimization Methods, John Hooker

John Hooker

No abstract provided.

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The Effects Of An Interactive Software Agent On Student Affective Dynamics While Using An Intelligent Tutoring System, Ryan Baker, Ma.Mercedes Rodrigo, Jenilyn Agapito, Julieta Nabos, Ma.Concepcion Repalam, Salvador Reyes, Maria Ofelia San Pedro Dec 2011

The Effects Of An Interactive Software Agent On Student Affective Dynamics While Using An Intelligent Tutoring System, Ryan Baker, Ma.Mercedes Rodrigo, Jenilyn Agapito, Julieta Nabos, Ma.Concepcion Repalam, Salvador Reyes, Maria Ofelia San Pedro

Ryan S.J.d. Baker

We study the affective states exhibited by students using an intelligent tutoring system for Scatterplots with and without an interactive software agent, Scooter the Tutor. Scooter the Tutor had been previously shown to lead to improved learning outcomes as compared to the same tutoring system without Scooter. We found that affective states and transitions between affective states were very similar among students in both conditions. With the exception of the “neutral state”, no affective state occurred significantly more in one condition over the other. Boredom, confusion, and engaged concentration persisted in both conditions, representing both “virtuous cycles” and “vicious cycles” …

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Impact Of Batch Appointments On No-Show Rates: A Public Versus Private Clinic Perspective, Husniyah Abdus-Salaam, Lauren Davis Dec 2011

Impact Of Batch Appointments On No-Show Rates: A Public Versus Private Clinic Perspective, Husniyah Abdus-Salaam, Lauren Davis

Dr. Lauren B Davis

Much of the appointment scheduling literature has characterized the impact of no-show rates with respect to individual appointment requests. However, little is known about the impact of appointments that are grouped by household. This study is concerned with understanding the prevalence of these family group appointments and identifying the appointment characteristics that significantly influence no-show rates. Using historical data from a public and private pediatric clinic, Multiway Frequency Analysis is used to characterize the association between appointment characteristics and appointment size. A logistic regression model is also developed to identify the factors that contribute to no-show rates for both clinics. …

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A Heuristic Approach For Allocation Of Data To Rfid Tags: A Data Allocation Knapsack Problem, Lauren Davis, Funda Samanlioglu, Xiaochun Jiang, Daniel Mota, Paul Stanfield Dec 2011

A Heuristic Approach For Allocation Of Data To Rfid Tags: A Data Allocation Knapsack Problem, Lauren Davis, Funda Samanlioglu, Xiaochun Jiang, Daniel Mota, Paul Stanfield

Dr. Lauren B Davis

Durable products and their components are increasingly being equipped with one of several forms of automatic identification technology such as radio frequency identification (RFID). This technology enables data collection, storage, and transmission of product information throughout its life cycle. Ideally all available relevant information could be stored on RFID tags with new information being added to the tags as it becomes available. However, because of the finite memory capacity of RFID tags along with the magnitude of potential lifecycle data, users need to be more selective in data allocation. In this research, the data allocation problem is modeled as a …

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Evaluating The Impact Of Ehr On Clinical Reasoning Performance: A Ttf Perspective, Matthew Wills, Omar El-Gayar, Amit Deokar Dec 2011

Evaluating The Impact Of Ehr On Clinical Reasoning Performance: A Ttf Perspective, Matthew Wills, Omar El-Gayar, Amit Deokar

Amit Deokar

The proliferation of Electronic Health Records (EHR) as a backbone for healthcare delivery necessitates adequate tools for evaluating and improving the efficacy of such investments particularly as it relates to clinical reasoning performance. However, a thorough review of the literature indicates lack of a tested, validated instrument for evaluating and predicting the impact of EHR use on clinical reasoning performance. Despite successful application to a variety of other industries, TTF has not been adequately adapted to healthcare, EHR technology or the clinical reasoning task. Accordingly, the objectives of this research are to: 1) produce a valid instrument with diagnostic and …

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