Miami University, Ohio
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A Methodology for the Implementation and Maintenance Of a Data Warehouse
Get PDFA methodology for the implementation and maintenance of a data warehouse is described. The data warehouse forms the basis for a marketing decision support system for use by a large surgical equipment manufacturer and requires integration of multiple sources of data external to the company. A prototype system is developed based upon the methodology. Each phase of the data warehouse implementation is discussed, including the data conversion process from raw data files to the prototype and production environments. Emphasis is placed upon the selection of suitable software tools for each process. The research approach employed is action research, in which the researcher
participates with a client organization that exhibits the problems of interest to the investigator. The client organization is a large surgical equipment manufacturer,
Ethicon Endo-Surgery
HypIR: Hypertext Based Information Retrieval
Get PDFInformation Retrieval (IR), which is also known as text or document retrieval, is the process of locating and retrieving docri)nents that are relevant to the user queries. In
hypertext environments, docuinent databases are organized as a network of nodes which are interconnected by various types of links. This study introduces a hypertext-based text retrieval system, HypIR. In HypIR, the sentantic relationships ainong docuinents are obtained using a clustering algorithm. A new approach providing the advantages of system maps and history list is introduced to prevent the user fiotn being lost in the IR hivperspace. The paper presents the underlying concepts and iinplementation details. HypIR is based on the object-oriented paradigm and its execution platforin is HyperCard
Cell Programming Language Investigation of Extensions For Flow Control and Error Recovery in the Language
Get PDFThe Cell Programming Language (CPL) is a simple programming language which allows the students and faculty to easily program a workcell on a personal computer as the workcell
controller. However, the original version of CPL lacks programming flexibility and power since it does not support subroutines, flow control, error recovery and operator interface to the execution of a CPL program. The objective of the project is to design and implement a new version of CPL to overcome the shortcomings of the original CPL by extending the language to include flow control, error recovery and operator interface to the execution of a CPL program. In this report CPL is introduced. The problems in the original CPL are addressed, the extensions to the original CPL are defined, and the implementation of the extensions is described. Some future development tasks are also discussed
Analysis of Multiterm Queries in Partitioned Signature File Environments
Get PDFThe concern of this study is the signature files which are used for information storage and retrieval in both formatted and unformatted databases. The analysis combines the concerns of signature extraction and signature file organization which have usually been treated as separate issues. Both the uniform frequency and single term query assumptions are relaxed and a comprehensive analysis is presented for multiterm query environments where terms can be classified based on their query and database occurrence frequencies. The performance of three superimposed signature generation schemes is explored as they
are applied to a dynamic signature file organization based on linear hashing: Linear Hashing with Superimposed Signatures (LHSS). First scheme (SM) allows all terms set the same number of bits regardless of their discriminatory power whereas the second and third methods (MMS and MMM) emphasize the terms with high query and low database ooccurrence frequencies. Of these three schemes, only MMM takes the probability distribution of the number of query terms into account in finding the optimal mapping strategy. The main contribution of the study is the derivation of the performance evaluation formulas which is provided together with the analysis of various experimental
settings. Results indicate that MMM outperforms the other methods as the gap between the discriminatory power of the terms gets larger. The absolute value of the savings provided by MMM reaches a maximum for the high query weight case. However, the extra savings decline sharply for high weight and moderately for the low weight queries with the increase in database size. The applicability of the derivations to other partitioned signature organizations is discussed and a detailed analysis of Fixed Prefix Partitioning (FPP) is provided as an example. An approximate formula that is shown to estimate the
performance of both FPP and LHSS within an acceptable margin of error is also modified to account for the multiterm case
On Co-Existence of In-Band UWB-OFDM and GPS Signals: Tracking Performance Analysis
Get PDFThe problem of in-band co-existence between GPS and other potential interfering signals is viewed from the following angle in this paper: Is there a coding or modulation technique which would permit simultaneous use of GPS and other RF services occupying same bandwidth? Very low interference between the UWB radar and GPS signals can be achieved by shaping radar pulses using orthogonal frequency division multiplexing (OFDM) coding, which is a multi-carrier modulation technique targeted for commercial UWB communications. The paper shows that we can, in fact, expect a very good degree of interoperability of a system used for GPS reception and UWB-OFDM radar purposes. The benefits of using UWB sensor in conjunction with GPS can be for example, to supplement positioning algorithms with radar-collected data, as well as to perform general reconnaissance of the surrounding area. The paper includes detailed analysis of the proposed multiple-use UWB-OFDM radar/GPS receiver concept, the effect of co-existing UWB-OFDM signals on GPS receiver tracking loop carrier noise level, and the impact on the quality of GPS solution in weak GPS signal environment. A brief discussion of MATLAB implementation of the modeled scenarios is presented as well
Miami University Technical Report: Dynamic Resource Allocation in Integrated Optical Wireless Access Architectures (Version 1, October 2008)
Get PDFWe consider integrated optical-wireless access network architectures. We propose and evaluate dynamic resource allocation algorithms for such architectures with an explicit incorporation of the reconfiguration delays. Algorithmic complexity results are also presented
Developing Specifications for the Competitive Bidding of Intake, Assessment & Case Management Services
Get PDFThis report provides information about the elements of case management, intake, and assessment programs that are often specified in current standards or bid specifications. Observation of current practices, a literature review, and key informant interviews were used to develop recommendations for the Council on Aging of Southwestern Ohio to develop bid specifications for the Butler County ESP
Carrion - It's what's for dinner: Wolves reduce the impact of climate change.
Get PDFHumans have viewed wolves as competitors, threats to personal safety, and symbols of evil throughout history. By the early part of the 20th century, grey wolves (Canis lupus) had been eradicated from 42% of their historic range in North America (Laliberte & Ripple, 2004). In Yellowstone National Park, grey wolves were hunted to local extinction by 1926, but were reintroduced in 1995 after a decades-long process involving biologists, politicians, ranchers and the general public. By the end of 2006, the wolf population in the park was at least 136 wolves in 13 packs (Smith et al., 2007). In this activity, high school students use mathematical models to explore how the presence of wolves buffers other carnivores and scavengers from the effects of climate change. By the end of the lesson, students should be able to:
Define and give examples of keystone species,
Demonstrate, using mathematical models, that ecosystems are more resilient to environmental change, when they contain a full complement of species, including top carnivores,
Recognize that math is a vital tool in scientific investigations
Location-Allocation Analysis of Retailing Using Microsoft Windows
Get PDFThe chief objective of this research project is to provide a user-friendly graphical interface for location-allocation analysis of retailing. An application program named Loc is developed with Microsoft Windows. The application program allows a user to interactively supply the paramters for a location-allocation algorithm. It also presents maps and reports to assist users to analyze the results. The program serves very well as an instructional tool for the concepts of location-allocation analysis. It is also a tool for decision makers for conducting quick visual comparison of location plans.
This paper is a description of the research project. The next secion introduces the basic concepts of location-allocation analysis in general and the application of such analysis to retailing. The third section describes the characteristics and functionalitites of the Loc program. Since the secondary objective of this research project is to explore the programming features of Microsoft Windows, the fourth section is a detailed discussion of the Windows programming environment and its object-oriented nature in particular. Some future enhancements of the application program are suggested in the last section
Gravity Wave Propagation in a Nonisothermal Atmosphere with height Varying Background Wind
Get PDFWe derive a gravity wave propagation equation for a compressible and non-isothermal atmosphere with a variable background wind profile. Impact of all the gradient terms on the vertical wavenumber depends only on the intrinsic horizontal phase velocity and the background atmosphere. For the background wind variation, any one of the linear first order derivative, second order derivative and the square of the first order derivative terms can be the dominant term under different conditions. For temperature variation, only the linear first order derivative is important for waves having a slow intrinsic horizontal phase velocity. Our equation indicates that the effect of wind shear on the vertical wavenumber is opposite to that predicted by the Taylor-Goldstein equation, which assumes an incompressible fluid. We also derive an expression for the amplitude of the vertical wind perturbation. Citation: Zhou, Q., and Y. T. Morton (2007), Gravity wave propagation in a nonisothermal atmosphere with height varying background wind, Geophys. Res. Lett., 34, L23803, doi:10.1029/2007GL031061