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Analysis of demand-supply interaction and inventory build-up strategies for products with short life cycles

Analysis of demand-supply interaction and inventory build-up...

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作者： Solis, Adriano O. Pan, Rong Paul, Bixler Nicoletti, Letizia School of Administrative Studies York University Toronto ON M3J 1P3 Canada School of Computing Informatics and Decision Systems Engineering Arizona State University Tempe AZ 85287-8809 United States Global Program Management Dell Inc. Austin TX 78753 United States Department of Mechanical Energy and Management Engineering University of Calabria 87036 Rende Cosenza Italy

Revenues and profits from short life cycle products will depend upon careful formulation and execution of production plans in response to demands in the marketplace. This research contributes to the development of the production and inventory build-up strategies for short life cycle products under different demand-supply scenarios. A modified Bass diffusion model is used to characterise the product demand pattern with consideration of demand-sales interaction. We develop cost models based on production costs, inventory carrying costs, backlog costs, and cost of lost sales for a number of different production scenarios. The optimal production rate is obtained by minimising the total cost. We also investigate the benefit of an initial build-up of inventory before the product's sales period starts. © 2013 Inderscience Enterprises Ltd.

关键词： Costs

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Indoor scene knowledge acquisition using a natural language interface

Indoor scene knowledge acquisition using a natural language ...

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Workshop on Spatial Knowledge Acquisition with Limited Information Displays 2012, SKALID 2012

作者： Kesavan, Saranya Giudice, Nicholas A. School of Computing and Information Science Spatial Informatics Program University of Maine United States

This paper proposes an interface that uses automatically-generated Natural Language (NL) descriptions to describe indoor scenes based on photos taken of that scene from smartphones or other portable camera-equipped mobile devices. The goal is to develop a non-visual interface based on spatio-linguistic descriptions which could assist blind people in knowing the contents of an indoor scene (e.g., room structure, furniture, landmarks, etc.) and supporting efficient navigation of this space based on these descriptions. In this paper, we concentrate on understanding the most salient content of a stereotypic indoor scene that is described by an observer, categorizing the description strategies employed in this process, and evaluating the best presentation of directional information using NL descriptions in order to support the most accurate spatial behaviors and mental representations of these scenes by means of human behavioral experiments. This knowledge will then be used to develop a domain specific indoor scene ontology, which in turn will be used to generate automated NL descriptions of indoor scenes based on their photographs, which will finally be integrated into a real-time non-visual scene description system.

关键词： Ontology

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Using equivalence classes for testing programs for safety instrumented systems

Using equivalence classes for testing programs for safety in...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Kézia de Vasconcelos Oliveira Angelo Perkusich Kyller Costa Gorgônio Leandro Dias da Silva Aldenor Falcão Martins Center of Electrical Engineering and Informatics Federal University of Campina Grande Campina Grande Paraiba Brazil Computing Institute Federal University of Alagoas Maceio Alagoas Brazil Graduate Program in Electrical Engineering Federal University of Campina Grande Campina Grande Paraiba Brazil

The reliability on Safety Instrumented Systems (SIS) is critical for the safe operation of many industrial applications. In particular, SIS play an important role in oil and gas processing plants. SIS are responsible not only for the continuous operation of the plant, it also keeps the plant in a safe state, avoiding damages to the environment and minimizing risks to employees. Therefore, the correct behavior of such systems is an important goal to achieve when building industrial plants. Verification and testing of SIS programs is a very hard task to accomplish. This happens mainly for two reasons. First, testing the real system is very expensive and sometimes it may take a huge amount of time, weeks or even months. Second, those systems deal with a huge number of variables. It is not always possible for a human tester to check if all of them are correct when performing tests. Providing an automatic and formal testing approach for such systems is an important contribution for the development of such systems. In this work we introduce a new method for generating test cases for SIS programs running on programable Logic Controller (PLC). As we did on previous work, ISA 5.2 diagrams are used as specification of the systems, but now we are using a hardware-in-the-loop technique, and the target artifact is a software running on a PLC. To avoid the execution of redundant tests, we introduced a new test case generation algorithm that is based on equivalence classes. Finally, we discussed a study case in which our method is used to detect error, that were introduced on purpose, on a simple system.

关键词： Automata Testing Safety Valves Input variables Computational modeling Instruments

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The effects of visual granularity on indoor spatial learning assisted by mobile 3D information displays

The effects of visual granularity on indoor spatial learning...

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International Conference on Spatial Cognition, SC 2012

作者： Giudice, Nicholas A. Li, Hengshan Spatial Informatics Program School of Computing and Information Science University of Maine Orono ME 04469 United States

ISBN: (纸本)9783642327315

There is growing interest in improving indoor navigation using 3D spatial visualizations rendered on mobile devices. However, the level of information conveyed by these visualization interfaces in order to best support indoor spatial learning has been poorly studied. This experiment investigates how learning of multi-level virtual buildings assisted by mobile 3D displays rendered at different levels of visual granularity effect subsequent unaided navigation tasks. The visual granularity levels include: a high fidelity model, low fidelity model, wireframe model and sparse model. Results showed that using the sparse model during learning led to the most accurate and efficient overall pointing and navigation performance and that between-floor judgments were less accurate when assistance during learning was unavailable. These findings demonstrate that more information is not necessarily better and provide new insights into the optimal information content to be included in mobile 3D visualization interfaces supporting indoor spatial learning and cognitive map development. © 2012 Springer-Verlag.

关键词： Visualization

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Using mobile 3D visualization techniques to facilitate multi-level cognitive map development of complex indoor spaces

Using mobile 3D visualization techniques to facilitate multi...

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Workshop on Spatial Knowledge Acquisition with Limited Information Displays 2012, SKALID 2012

作者： Li, Hengshan Giudice, Nicholas A. Spatial Informatics Program School of Computing and Information Science University of Maine Orono ME 04469 USA United States

Several studies have verified that multi-level floors are an obstacle for indoor wayfinding (e.g., navigators show greater angular error when making inter-level pointing judgments and experience more disorientation when wayfinding between floors). Previous literature has also suggested that a multi-level cognitive map could be a set of vertically super-imposed 2D cognitive maps and each level could be viewed as a region. However, little research has studied how one mentally connects / integrates the different levels of the 3D cognitive map. This paper provides new insight into how people may integrate multi-level cognitive maps based on the concept of a "transition point", a term used to represent the abstract point that connects different levels of the building. Based on transition points, we proposed the concept of simulated global indoor landmarks which are displayed on mobile devices. We predict that users can develop multi-level cognitive maps more efficiently when assisted by these global indoor landmarks. An ongoing behavioral experiment is briefly described aimed at providing empirical verification for these predictions.

关键词： Floors

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Improved malware classification through sensor fusion using disjoint union

Improved malware classification through sensor fusion using ...

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6th International Conference on Information Systems, Management and Technology, ICISTM 2012

作者： LeDoux, Charles Walenstein, Andrew Lakhotia, Arun Center for Advanced Computer Studies University of Louisiana at Lafayette Lafayette LA United States School of Computing and Informatics Computer Science Program University of Louisiana at Lafayette Lafayette LA United States

ISBN: (纸本)9783642291654

In classifying malware, an open research question is how to combine similar extracted data from program analyzers in such a way that the advantages of the analyzers accrue and the errors are minimized. We propose an approach to fusing multiple program analysis outputs by abstracting the features to a common form and utilizing a disjoint union fusion function. The approach is evaluated in an experiment measuring classification accuracy on fused dynamic trace data on over 18,000 malware files. The results indicate that a naïve fusion approach can yield improvements over non-fused results, but the disjoint union fusion function outperforms naïve union by a statistically significant amount in three of four classification methods applied. © 2012 Springer-Verlag.

关键词： Malware

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Evaluation of process variability on current for nanotechnologies devices

Evaluation of process variability on current for nanotechnol...

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2012 IEEE 3rd Latin American Symposium on Circuits and Systems, LASCAS 2012

作者： Meinhardt, Cristina Reis, Ricardo Computer Science Center - C3 Federal University of Rio Grande - FURG Rio Grande Brazil Graduate Program in Computing Institute of Informatics Federal University of Rio Grande Do Sul - UFRGS Porto Alegre Brazil

ISBN: (纸本)9781467312080

The continuous shrinking of devices has introduced new challenges to integrated circuit design, mainly to deal with the parametric variations in process parameters. This paper presents an evaluation of the process variability on the current Ids of nanotechnologies devices, individually and simultaneously, taking into account the correlation among them. The results show that the deviation from mean value is quite significant ≈ 16% for high performance models. The variation of L has the dominant effect on the overall variation of the device in high performance models while the dominant effect on the overall variation of the device in low power models still being due to Vth variations. Lastly, the effect of process parameter variations deteriorates with technology scaling, with a considerable increase in the deviation from the 22nm to 16nm technology. © 2012 IEEE.

关键词： Nanotechnology

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Learning non-visual graphical information using a touch-based vibro-audio interface 12

Learning non-visual graphical information using a touch-base...

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14th International ACM SIGACCESS Conference on Computers and Accessibility, ASSETS 2012

作者： Giudice, Nicholas A. Palani, Hari Prasath Brenner, Eric Kramer, Kevin M. Spatial Informatics Program School of Computing and Information Science University of Maine 5711 Boardman Hall Orono ME 04469 United States Advanced Medical Electronics 6901 East Fish Lake Road Maple Grove MN 55368 United States

ISBN: (纸本)9781450313216

This paper evaluates an inexpensive and intuitive approach for providing non-visual access to graphic material, called a vibro-audio interface. The system works by allowing users to freely explore graphical information on the touchscreen of a commercially available tablet and synchronously triggering vibration patterns and auditory information whenever an on-screen visual element is touched. Three studies were conducted that assessed legibility and comprehension of the relative relations and global structure of a bar graph Exp 1 Pattern recognition via a letter identification task Exp 2 and orientation discrimination of geometric shapes Exp 3). Performance with the touch-based device was compared to the same tasks performed using standard hardcopy tactile graphics. Results showed similar error performance between modes for all measures, indicating that the vibro-audio interface is a viable multimodal solution for providing access to dynamic visual information and supporting accurate spatial learning and the development of mental representations of graphical material.

关键词： Pattern recognition

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Prioritization of applications for software-As-A-service migration using total life cycle costs and the analytic network process

Prioritization of applications for software-As-A-service mig...

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2012 World Congress on Engineering, WCE 2012

作者： Jalao, Eugene Rex L. Shunk, Dan L Wu, Teresa Department of Industrial Engineering from Arizona State University University of the Philippines Industrial Engineering Department Philippines Arizona State University United States Industrial Engineering Program at School of Computing Informatics Decision Systems Engineering of Arizona State University United States

ISBN: (纸本)9789881925220

The current state of the world economy has made Software-As-A-Service (SaaS) an appealing concept for organizations with a small budget for IT infrastructure investment. In a SaaS setup, companies subscribe software applications on a pay-per-use system from external service providers over the internet. However, these companies are looking for a decision framework that can be used to prioritize business software applications for SaaS migration. This paper attempts to fill in this gap by proposing a hybrid methodology which is composed of a total system life cycle (SLC) cost analysis for cost estimation and the analytic network process (ANP) for prioritization. Real test case data is used to validate the decision making capability of the framework. Sensitivity analysis was done to determine the robustness of the recommendations using Monte Carlo simulation. Results show that the proposed methodology could aid managers prioritizes software application projects for SaaS migration. © 2012 Newswood Limited. All rights reserved.

关键词： Sensitivity analysis

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On region-based fault tolerant design of distributed file storage in networks

On region-based fault tolerant design of distributed file st...

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： Sujogya Banerjee Shahrzad Shirazipourazad Arunabha Sen Computer Science and Engineering Program School of Computing Informatics and Decision System Engineering Arizona State University Tempe AZ USA

ISBN: (纸本)9781467307734;9781467307758

Distributed storage of data files in different nodes of a network enhances the reliability of the data by offering protection against node failure. In the (N,K),N ≥ K file distribution scheme, from a file F of size |F|, N segments of size |F|/K are created in such a way that it is possible to reconstruct the entire file, just by accessing any K segments. For the reconstruction scheme to work it is essential that the K segments of the file are stored in nodes that are connected in the network. However in case of node failures the network might become disconnected (i.e., split into several connected components). We focus on node failures that are spatially-correlated or region-based. Such failures are often encountered in disaster situations or natural calamities where only the nodes in the disaster zone are affected. The goal of this research is to devise a file segment distribution scheme so that, even if the network becomes disconnected due to any region fault, at least one of the largest connected components will have at least K distinct file segments with which to reconstruct the entire file. The distribution scheme will also ensure that the total storage requirement is minimized. We provide an optimal solution through Integer Linear programming and an approximation solution with a guaranteed performance bound of O(ln n) to solve the problem for any arbitrary network. The performance of the approximation algorithm is evaluated by simulation on two real networks.

关键词： Image color analysis Color Approximation algorithms Robustness Approximation methods Layout Encoding

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