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Articles 99391 - 99420 of 198066

Full-Text Articles in Engineering

Non-Traditional Aisle Design For A Manufacturing Facility Layout, Dale T. Masel, Dean Marinchek Jan 2016

Non-Traditional Aisle Design For A Manufacturing Facility Layout, Dale T. Masel, Dean Marinchek

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Methods for designing a facility layout typically assume that the aisles for interdepartmental travel will be parallel to the exterior walls of the facility. However, by putting aisles at an angle to the exterior walls, more direct routes between departments can be created, reducing travel distance. This paper describes a method to create a facility layout that does not have orthogonal aisles and testing of the resulting layouts shows that travel distance is reduced.

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Operational-Level Optimization Of Inbound Intralogistics, Hector J. Carlo, Yeiram Martinez Jan 2016

Operational-Level Optimization Of Inbound Intralogistics, Hector J. Carlo, Yeiram Martinez

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

This study is concerned with optimizing inbound operations at distribution centers (DCs), warehouses, and cross-docks with staging areas. The objective of the problem is to minimize the makespan required to move all unit loads from the trailers to the flow racks, and from the flow racks to their respective storage locations. It is assumed that a set of inbound trailers with known composition have been assigned and sequenced to inbound dock doors. The following three inbound logistics decisions are simultaneously considered: i) unloaders’ assignment and scheduling, ii) loads-to-flow rack assignment, and iii) assignment and haulers’ scheduling. In this study we …

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Understanding Worker Blocking And The Design Process, Russell D. Meller, Lisa M. Thomas Jan 2016

Understanding Worker Blocking And The Design Process, Russell D. Meller, Lisa M. Thomas

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Designing a distribution center (DC) is a complex process that consists of answering dozens of interrelated questions. From our perspective, the penultimate question is one of which picking methodology is optimal. To answer this question requires a full evaluation of picking methodologies in terms of their ability to meet the expected throughput requirements of the system. In manual picking systems, as throughput requirements increase, worker interaction and blocking increase as well. This implies that being able to estimate the amount of worker blocking in a system is critical to a design effort. Most of the prior research in this area …

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Introducing The Concept Of Hyperconnected Mobile Production, Suzanne Marcotte, Benoit Montreuil Jan 2016

Introducing The Concept Of Hyperconnected Mobile Production, Suzanne Marcotte, Benoit Montreuil

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Many globalized businesses are trying to cope with growing competition by strategically expanding their dedicated network of production facilities so as to be able to offer and to deliver time and price competitive offers to their clients across the world. In this paper, exploiting Physical Internet principles, we introduce the concept of hyperconnected mobile production that can alternatively enable businesses to dynamically expand and contract as necessary their production capacity in regions worldwide. First, hyperconnected mobile production exploits open fabs from multiple parties readily available in those regions. Second, these fabs are to rely on plug-and-play production modules. These modules …

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A High-Density, Puzzle-Based System For Rail-Rail Container Transfers, Kevin Gue Jan 2016

A High-Density, Puzzle-Based System For Rail-Rail Container Transfers, Kevin Gue

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

We describe a high-density, puzzle-based storage and transfer system for containers in a rail-to-rail hub for the Physical Internet. The system uses a new algorithm called GridHub, which is able to transfer items in all four cardinal directions simultaneously within a grid. We show how the GridHub system might be used in a rail-rail transfer hub to transfer containers between one side of the grid and a train.

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Logistics Models To Support Order-Fulfillment From The Sea, Jennifer Pazour, Ian Shin Jan 2016

Logistics Models To Support Order-Fulfillment From The Sea, Jennifer Pazour, Ian Shin

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Sea based logistics use maritime platforms to transfer cargo stored on vessels and delivers them ashore. This chapter describes the motivations and logistical requirements of seabasing. The sea base’s organizational structure, its material handling environment, and the internal cargo flow processes of the T-AKE vessel are described. Three seabasing distribution network scenarios -- Iron Mountain, Skin-to-Skin Replenishment, and Tailored Resupply Packages -- are described and mapped to warehousing and distribution networks, characteristics, and decision problems. Finally, related literature is reviewed and open areas for logistics research to support order fulfillment from the sea are identified.

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Omnichannel Business-­‐To-­‐Consumer Logistics And Supply Chains: Towards Hyperconnected Networks And Facilities, Benoit Montreuil Jan 2016

Omnichannel Business-­‐To-­‐Consumer Logistics And Supply Chains: Towards Hyperconnected Networks And Facilities, Benoit Montreuil

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

This paper deals with omnichannel business-­‐to-­‐consumer logistics and supply chains. Its key contribution is the conceptualization of hyperconnected network and facility design options for enabling to meet the challenges toward achieving omnichannel logistics efficiently and sustainably while meeting the timely expectations of clients. These design options exploit key Physical Internet concepts. They encompass the transportation, pickup and delivery of ordered goods, the deployment of products across territories to enable fast response to orders, as well as on-­‐demand production of products across networks of facilities while engaging multiple parties. The options range from current practice to prospective ones that are associated …

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Maritime Location Decisions For Lng Bunkering Facilities, Reinier C. Schneider, Iris F.A. Vis Jan 2016

Maritime Location Decisions For Lng Bunkering Facilities, Reinier C. Schneider, Iris F.A. Vis

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Liquefied natural gas (LNG) is one of the upcoming fuels to be used for more sustainable shipping activities in the maritime sector. For a widespread adoption by end-users, a refuelling network requiring capital intensive investments, needs to be in place. From a macro perspective of suppliers of LNG, it makes sense to develop the infrastructure at strategic locations that capture as many vessels and ships as possible. The goal of this research is to develop a facility location model that can contribute to the location selection of LNG facilities in a new fuelling network. The new model will fit the …

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Methodology For Choosing An Appropriate Inland Vessels As A Floating Distribution Centers, Andrea Seidlova, David Sourek Jan 2016

Methodology For Choosing An Appropriate Inland Vessels As A Floating Distribution Centers, Andrea Seidlova, David Sourek

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

The primary goal of this paper is to propose a methodology for the choice of an appropriate vessel type under the specific condition of floating distribution center. The right choice of the appropriate type of vessel has a fundamental influence on the long-term success of city logistic projects with water transport. In this paper, we propose a methodology for vessel choice according to its inner layout and technology of handling. The possibility of an application in practice will be defined for each option.

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Integrated Versus Sequential Scheduling And Assignment At A Unit Load Cross-Dock, Arpan Rijal, Marco Bijvank, Rene De Koster Jan 2016

Integrated Versus Sequential Scheduling And Assignment At A Unit Load Cross-Dock, Arpan Rijal, Marco Bijvank, Rene De Koster

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Within a cross-dock, the assignment of trucks to dock-doors and the scheduling of trucks to be processed are two major operational decisions. Conventionally, assignment and scheduling decisions are made sequentially. However, solving the two problems sequentially can lead to sub-optimal solutions because the objectives of the two problems are in conflict with each other. To gain further insights, we create an integrated model which is capable of simultaneously scheduling and assigning trucks at cross-docks. We contrast the integrated model with a sequential model which first schedules trucks for processing and then assigns them to dock-doors. Experiments demonstrate that the integrated …

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A Heuristic Approach To Storage System Design With Simultaneous Assignment Of Goods, Tobias Staab, Willibad A. Gunthner Jan 2016

A Heuristic Approach To Storage System Design With Simultaneous Assignment Of Goods, Tobias Staab, Willibad A. Gunthner

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

In the paper at hand, we analyze the planning of manually operated storage systems consisting of different storage areas. When solving design problems like dimensioning or equipment selection, the assignment of goods to storage areas has to be considered. Based on a general model to describe the geometry and performance calculation of a warehouse, we present a heuristic approach to assign goods to storage areas while simultaneously determining the design of the storage areas in a way that generates the lowest running costs. Our approach aims to support planners during the rough planning stage by providing a quick overview of …

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Intermodal Hubs In The Physical Internet, Nadeepa Wickramage, Bill Ferrell Jan 2016

Intermodal Hubs In The Physical Internet, Nadeepa Wickramage, Bill Ferrell

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Distribution of finished goods is currently an effective but inefficient process that consumes significant quantities of fossil fuel to move empty assets. This results in increased costs that are passed to the consumer and unnecessarily increased carbon emissions. The Physical Internet (PI) is focused on shared logistics that could prove to be an important element of next-generation logistics systems. The idea is to store and transport goods in anonymous standard-sized containers so that transportation and warehousing can be efficiently shared by many companies including competitors. If implemented, this idea has the potential of dramatically increasing efficiency thereby reducing fuel consumption …

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Analyzing Order Throughput Times In A Milkrun Picking System, J. P. Van Der Gaast, M.B. M. De Koster, Ivo J.B.F. Adan Jan 2016

Analyzing Order Throughput Times In A Milkrun Picking System, J. P. Van Der Gaast, M.B. M. De Koster, Ivo J.B.F. Adan

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

E-commerce fulfillment competition evolves around cheap, speedy, and time-definite delivery. Milkrun order picking systems have proven to be very successful in providing handling speed for a large, but highly variable, number of orders. In this system, an order picker picks orders that arrive in real time during the picking process; by dynamically changing the stops on the picker’s current picking route. The advantage of milkrun picking is that it reduces order picking set-up time and worker travel time compared to conventional batch picking systems. This paper is the first in studying order throughput times of multi-line orders in a milkrun …

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A Lagrangian Relaxation For Capacitated Single Allocation P-Hub Median Problem With Multiple Capacity Levels, Ching-Jung Ting, Kuo-Rui Lu Jan 2016

A Lagrangian Relaxation For Capacitated Single Allocation P-Hub Median Problem With Multiple Capacity Levels, Ching-Jung Ting, Kuo-Rui Lu

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

In this paper we consider a capacitated single allocation p-hub median problem with multiple capacity levels (CSApHMPMC) in which the decisions are to determine the location of p hubs and their capacity levels, the single allocation of non-hub nodes to hubs in the logistics network. This problem is formulated as an integer programming model with the objective of minimizing the sum of total transportation cost and fixed cost of the selected p hubs with established capacity levels. A Lagrangian relaxation (LR) approach is proposed to solve the CSApHMPMC. The Lagrangian function that we formulated decomposed the original problem into smaller …

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Composite Gel Polymer Electrolyte For Lithium Ion Batteries, Roya Naderi Jan 2016

Composite Gel Polymer Electrolyte For Lithium Ion Batteries, Roya Naderi

Electronic Theses and Dissertations

Batteries have been ubiquitously utilized in enormous applications such as portable electronics, satellites, computers, medical instruments, and electric cars. The development of battery technology has been through a long journey since the 17th century, paving its way to commercialization of lithium ion batteries in 1991 by Sony. Rechargeable lithium ion batteries represent the most favorable type of batteries for portable applications due to their high energy density compared to other alkali metals. In 1997, lithium polymer batteries with solid polymer/composite electrolyte were introduced where the safety drawbacks of the liquid electrolyte were eliminated but the ionic conductivity of the batteries …

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Study Of Moisture And Water Effects In Low Temperature Crystallization Of Perovskite Film For Efficient Solar Cells, Ashish Dubey Jan 2016

Study Of Moisture And Water Effects In Low Temperature Crystallization Of Perovskite Film For Efficient Solar Cells, Ashish Dubey

Electronic Theses and Dissertations

Organic-inorganic perovskite solar cells have become a promising alternative to fossil fuel based energy sources due to their unique properties such as tunable low bandgap, long charge diffusion length, low exciton binding energy and balanced charge transport. The semiconducting perovskite films are typically prepared from low temperature solution processing and the corresponding solar cells have exhibited power conversion efficiency (PCE) of more than 20%. However, perovskite solar cells suffer from poor stability in presence of moisture and use of toxic element (Pb). Understanding the crystallization process and the effects of moisture and water is important to obtain high quality perovskite …

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Precast Full-Depth Deck Panels Supported On Inverted Bulb-Tee Bridge Girders, Michael James Mingo Jan 2016

Precast Full-Depth Deck Panels Supported On Inverted Bulb-Tee Bridge Girders, Michael James Mingo

Electronic Theses and Dissertations

The South Dakota Department of Transportation (SDDOT) currently uses precast double-tee bridge deck systems for many of its county bridges because they are economical and fast in construction. Current bridges are designed for a service life of 75 years. However, many double-tee girder bridges are deteriorating and some need total replacement after 40 years in service. Furthermore, the double-tee bridge system only has one supplier in South Dakota. Alternative durable precast or prefabricated bridge systems are needed to provide more options to local governments when designing a new bridge. Different alternatives will also give local governments more flexibility to select …

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Reflectance-Based Calibration And Validation Of The Landsat Satellite Archive, Sandeep Kumar Chittimalli Jan 2016

Reflectance-Based Calibration And Validation Of The Landsat Satellite Archive, Sandeep Kumar Chittimalli

Electronic Theses and Dissertations

The primary objective of this project was to consistently calibrate the entire Landsat series to a common reflectance scale by performing cross-calibration corrections from Landsat-8 OLI to Landsat- 1 MSS. A consistent radiance-based calibration was already performed from Landsat-8 OLI through Landsat-1 MSS using bright targets and dark targets. The MSS radiance-based calibration results showed an uncertainty of about ±5%. Typically to convert from radiance to reflectance a solar model is used. Unfortunately, there are numerous solar models, all with various levels of accuracies. It was also seen that there is a data format inconsistency for different types of MSS …

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Reuse Of Aqueous Waste Streams For Transportation-Related Applications, Gregory L. Hansen Jan 2016

Reuse Of Aqueous Waste Streams For Transportation-Related Applications, Gregory L. Hansen

Electronic Theses and Dissertations

Aqueous waste streams produced from commercial, industrial, and municipal processes may be potentially reused for transportation applications. The objectives of this project were to identify potential transportation-related applications for aqueous waste streams available in South Dakota, develop guidance for the beneficial reuse of aqueous waste streams, and evaluate the reuse of MIEX® brine generated by the Watertown Municipal Water Treatment Plant (WMWTP). This study identified many aqueous wastes from municipal water and wastewater treatment facilities, industrial and agricultural processes in South Dakota that can be potentially used for ice and dust control. Beneficial reuse of these waste streams requires a …

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Bidirectional Distribution Reflection Function Of Algodones Dunes, Mahesh Shrestha Jan 2016

Bidirectional Distribution Reflection Function Of Algodones Dunes, Mahesh Shrestha

Electronic Theses and Dissertations

The primary objective of this project was to develop the Algodones Dunes as a pseudo-invariant calibration site (PICS) suitable for absolute calibration of satellite sensors based on a surface reflectance model. Two approaches were taken during this research: a field campaign and laboratory measurements. The first approach, the field campaign, was accomplished with a trip to the Algodones Dunes from the 8th to the 13th of March, 2015. During the field campaign, several test points from spatially different regions of the Algodones Dunes were studied. Reflectance of the sand at each test point was observed from different view angles. The …

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Behavior Of Light In A Photobioreactor And Design Of Light Guides, Anand Rajendran Jan 2016

Behavior Of Light In A Photobioreactor And Design Of Light Guides, Anand Rajendran

Electronic Theses and Dissertations

The purposes of the thesis is to explain the microalgae cultivation in a photobioreactor system; demonstrate the light activity in a flat-plate photobioreactor; and design the light channeling system. Generally, microalgae are cultivated in open ponds and in closed photobioreactor systems. In open ponds, the productivity of microalgal biomass is very low, due to lack and improper use of carbon and energy sources. In photobioreactor systems, all required inputs can be supplied effectively to the microalgae which in turn increases the biomass productivity. However, these systems are expensive to build and to maintain in a largescale basis. In a photobioreactor, …

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Induction Local Softening Of Advanced High Strength Steel, Jorge Saul Cisneros Jan 2016

Induction Local Softening Of Advanced High Strength Steel, Jorge Saul Cisneros

Wayne State University Theses

This study was to determine the important parameters regarding induction local softening of dual phase steel with improved manufacturability for autobody stamping. Samples were inductively heat-treated, and then tested using micro hardness test, tensile test, microstructure analysis, and x-ray diffraction analysis. It was found that above 800oC there was a significant reduction in hardness. The cooling rate was found to be the most important parameter affecting the final properties of the steel. The tensile test showed a significant increase in total elongation with a small reduction in ultimate tensile strength. These factors led to the ultimate increase in formability. X-ray …

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Battery Energy Storage System (Bess) Based Photovoltaic Charging Station (Pv-Cs) For A Green University Transportation, Ayda Esfandyari, Agata Świerc, Brian Norton, Michael Conlon, Sarah Mccormack Jan 2016

Battery Energy Storage System (Bess) Based Photovoltaic Charging Station (Pv-Cs) For A Green University Transportation, Ayda Esfandyari, Agata Świerc, Brian Norton, Michael Conlon, Sarah Mccormack

Conference Papers

With the trends encouraged by governments and political parties to increase the adoption of Renewable Energy Sources (RES); solar energy, and in particular photovoltaics (PV), is poised as an excellent candidate to offset the energy requirements of charging stations (PV-CS) for Electric Vehicles (BEV). This work presents a 10.5 kW Transient System Simulation (TRNSYS) model of a university campus PV-CS to determine sizing as well to determine the best operating strategies for a Battery Energy Storage System (BESS). The economical optimization model is formulated via theoretical approach adopting the Simple Payback Period (SPP) indicator. The optimization takes into account the …

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Equi-Biaxial Fatigue Behaviour Of Magnetorheological Elastomers In Magnetic Fields, Yanfen Zhou, Mark Johnson, Shipeng Wen, Tony Betts, Stephen Jerrams Jan 2016

Equi-Biaxial Fatigue Behaviour Of Magnetorheological Elastomers In Magnetic Fields, Yanfen Zhou, Mark Johnson, Shipeng Wen, Tony Betts, Stephen Jerrams

Articles

The equi-biaxial fatigue behaviour of silicone based magnetorheological elastomers (MREs) in external magnetic fields was studied. Wöhler curves relating fatigue life to stress amplitude and dynamic stored energy for MREs with a range of magnetic particle contents were derived. It was found that the fatigue life of MREs in magnetic fields was higher than that without magnetic fields. Under constant stress amplitude conditions, the presence of magnetic fields resulted in longer times for the samples to undergo large deformations and thus complex modulus (E*) decreased at a slower rate during the fatigue process, especially for low stress amplitudes. MRE samples …

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Esprit Based Robust Anti-Islanding Algorithm For Grid-Tied Inverter, Sandipan Patra Jan 2016

Esprit Based Robust Anti-Islanding Algorithm For Grid-Tied Inverter, Sandipan Patra

Conference papers

Abstract—This paper presents an anti-islanding protection scheme for a grid tied inverter. In this scheme, the oscillation variation in frequency is estimated by Estimation of Signal Parameters via Rotational Invariant Technique (ESPRIT). The proposed system is implemented in MATLAB and real time in OPAL-RT. Series of simulation results demonstrate that nondetection zone of proposed algorithm is negligible, and the scheme is also free from nuisance tripping to other transient events.

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What Do We Know About Eesd And How Do We Know It?, Eddie Conlon, Iacovos Nicolaou, Brian Bowe Jan 2016

What Do We Know About Eesd And How Do We Know It?, Eddie Conlon, Iacovos Nicolaou, Brian Bowe

Conference papers

Huckle (2004) has argued that critical realism (CR) can provide a philosophical framework for higher education for sustainability. This paper reflects on the process of researching EESD in the Irish context and the usefulness of our approach which used mixed methods and drew on CR as its guiding philosophy. We will argue that aspects of the CR approach: its emphasis on a depth ontology, the search for causal mechanisms, its model of agency/structure relations and its emphasis on the combination of extensive and intensive methods provide tools for exploring EESD as a system. CR requires us to focus on “deeper …

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An Implantable Microstrip Antenna Design For Mics-Band Biomedical Applications, Adnan Sondaş, Mustafa Hi̇kmet Bi̇lgehan Uçar Jan 2016

An Implantable Microstrip Antenna Design For Mics-Band Biomedical Applications, Adnan Sondaş, Mustafa Hi̇kmet Bi̇lgehan Uçar

Turkish Journal of Electrical Engineering and Computer Sciences

In this paper, an implantable microstrip antenna design is introduced to cover the Medical Implant Communications Service (MICS, 402$-$405 MHz) band for biomedical telemetry systems. The radiating layer of the antenna comprises two concentric square split-ring elements and a metallic pad placed between them. A shorting pin is also used for miniaturization purposes, directly connecting the outer ring element to the ground plane. It is numerically demonstrated that the proposed antenna offers approximately 7{\%} impedance bandwidth and gains of 1.9 dBi at the designated frequency band. In addition, effects of some critical design parameters on the antenna performance are numerically …

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Fetal Electrocardiogram Estimation Using Polynomial Eigenvalue Decomposition, Soydan Redif Jan 2016

Fetal Electrocardiogram Estimation Using Polynomial Eigenvalue Decomposition, Soydan Redif

Turkish Journal of Electrical Engineering and Computer Sciences

decomposition (PEVD) to the problem of fetal electrocardiogram (ECG) extraction from real ECG recordings obtained from abdominal leads. We model the fetal ECG extraction problem as a broadband sensor array signal processing problem in order to account for the broadband nature of the ECG noise present in the recordings. An algorithm for providing an approximate PEVD is used in order to estimate the broadband noise subspace. Suppression of the broadband noise and maternal ECG is achieved by carrying out an orthonormal projection of the recordings onto the estimated fetal subspace. The proposed scheme was evaluated with multichannel synthetic ECG signals …

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Heart Sound Signal Classification Using Fast Independent Component Analysis, Yücel Koçyi̇ği̇t Jan 2016

Heart Sound Signal Classification Using Fast Independent Component Analysis, Yücel Koçyi̇ği̇t

Turkish Journal of Electrical Engineering and Computer Sciences

No abstract provided.

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Control Of A Ternary Voltage Progression Based Cascaded Multilevel Inverter Using Classy Split Multicarrier Pulse Width Modulation, Gayathri Monicka Subarnan, Jamuna Venugopal Jan 2016

Control Of A Ternary Voltage Progression Based Cascaded Multilevel Inverter Using Classy Split Multicarrier Pulse Width Modulation, Gayathri Monicka Subarnan, Jamuna Venugopal

Turkish Journal of Electrical Engineering and Computer Sciences

In this paper, a new hybrid pulse width modulation technique is proposed to enhance the performance of output voltage from a ternary progression based multilevel inverter. For high power applications, the multilevel inverter can appropriately replace the traditional converter without a transformer and the separate DC sources will be indispensable for various renewable energy sources. The classy split switching technique for the multicarrier pulse width modulation technique is adopted and the concept about new topology is presented in this paper. An arm controller has been chosen to implement the modulation due to its superior features, easy software, and hardware design. …

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