2,783 research outputs found
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Computer crimes: Taxonomy and prevention strategies
Computer and communications networks have greatly enhanced the effectiveness and efficiencies of organizations. They have, however, also created an opportunity for computer criminals. Computer crimes are committed for many reasons: 1) revenge by disgruntled employees, 2) desire for a challenge, 3) to cause mischief, and 4) money. In order to better understand the nature of computer crimes, a comprehensive taxonomy of computer crimes is developed in this paper. Strategies to effectively combat the various computer crimes are then presented. It is hoped that the information provided in this paper makes the readers more knowledgeable on this important topic and motivates them to deploy strategies to secure their organizational information resource from computer criminals
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A multidimensional framework for group decision support system research and design
Groups are a fundamental and essential part of organizational decision making. A group decision support system (GDSS) attempts to use computer and communications technology to help a group make better decisions. In this paper, previous GDSS research is extended to develop a better framework for future GDSS research and design. Six situational factors are identified; group size, member proximity, task type, group environment, and group development stage; so that a given group decision making situation can be accurately described. To standardize the features across different GDSS, six different levels of GDSS features are also identified. The paper then presents a multidimensional framework for conducting future GDSS research, and argues that future GDSS research needs to identify the appropriate GDSS features for the appropriate group decision situation. It is also suggested that researchers take a long-term, holistic approach while analyzing the results of using a GDSS
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Enhancing organizational performance via electronic customer relationship management
An Electronic Customer Relationship Management system or eCRM helps organizations shift from mass marketing of goods and services to customized marketing of personalized offers. As consumers are constantly getting more technologically savvy and sophisticated, eCRM systems allow businesses to tune-in to their customers\u27 needs and design appropriate personalized marketing campaigns. They not only allow more intelligent customer interactions and responses, but also do it in a cost effective manner. The primary purpose of this paper is to explain the eCRM concept and describe the major organizational benefits of eCRM
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Telecommuting: A new business work style
Advances in computer and networking technologies now permit organizations to allow employees to work from home and thus relieve them of the daily commute. This new work style is known as telecommuting. This paper introduces the concept of telecommuting, and discusses its advantages and disadvantages to both employees and organizations. We finally suggest methods by which an employer can develop and manage a successful telecommuting program
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Web-Services - The Next Evolutionary Stage of E-Business
Web-Services are a set of new technologies that promise to take service-oriented distributed computing to a whole new level, and eventually take e-business to the next evolutionary stage. Web-Services, in a nutshell, let organizations bridge communication gaps among their information systems, and build new software applications by stitching together existing ones. It is capable of integrating applications written in different programming languages, developed by different vendors, and running on different servers with dissimilar operating systems. Web- Services would enable companies to seamlessly connect their information systems and business processes with those of their partners and customers - thus ushering in a new service oriented distributed computing architecture. The purpose of this paper is to explore the nature of Web-Services, explain the essential concepts that enable Web- Services, and understand its major benefits and point out its shortcomings
A Faster Circular Binary Segmentation Algorithm for the Analysis of Array CGH Data
Motivation: Array CGH technologies enable the simultaneous measurement of DNA copy number for thousands of sites on a genome. We developed the circular binary segmentation (CBS) algorithm to divide the genome into regions of equal copy number (Olshen {\it et~al}, 2004). The algorithm tests for change-points using a maximal -statistic with a permutation reference distribution to obtain the corresponding -value. The number of computations required for the maximal test statistic is where is the number of markers. This makes the full permutation approach computationally prohibitive for the newer arrays that contain tens of thousands markers and highlights the need for a faster. algorithm.
Results: We present a hybrid approach to obtain the -value of the test statistic in linear time. We also introduce a rule for stopping early when there is strong evidence for the presence of a change. We show through simulations that the hybrid approach provides a substantial gain in speed with only a negligible loss in accuracy and that the stopping rule further increases speed. We also present the analysis of array CGH data from a breast cancer cell line to show the impact of the new approaches on the analysis of real data.
Availability: An R (R Development Core Team, 2006) version of the CBS algorithm has been implemented in the ``DNAcopy\u27\u27 package of the Bioconductor project (Gentleman {\it et~al}, 2004). The proposed hybrid method for the -value is available in version 1.2.1 or higher and the stopping rule for declaring a change early is available in version 1.5.1 or higher
Effect of the Intrinsic Width on the Piezoelectric Force Microscopy of a Single Ferroelectric Domain Wall
Intrinsic domain wall width is a fundamental parameter that reflects bulk
ferroelectric properties and governs the performance of ferroelectric memory
devices. We present closed-form analytical expressions for vertical and lateral
piezoelectric force microscopy (PFM) profiles for the conical and disc models
of the tip, beyond point charge and sphere approximations. The analysis takes
into account the finite intrinsic width of the domain wall, and dielectric
anisotropy of the material. These analytical expressions provide insight into
the mechanisms of PFM image formation and can be used for quantitative analysis
of the PFM domain wall profiles. PFM profile of a realistic domain wall is
shown to be the convolution of its intrinsic profile and resolution function of
PFM.Comment: 25 pages, 5 figures, 3 tables, 3 Appendices, To be submitted to J.
Appl. Phy
PAC-learning is Undecidable
The problem of attempting to learn the mapping between data and labels is the
crux of any machine learning task. It is, therefore, of interest to the machine
learning community on practical as well as theoretical counts to consider the
existence of a test or criterion for deciding the feasibility of attempting to
learn. We investigate the existence of such a criterion in the setting of
PAC-learning, basing the feasibility solely on whether the mapping to be learnt
lends itself to approximation by a given class of hypothesis functions. We show
that no such criterion exists, exposing a fundamental limitation in the
decidability of learning. In other words, we prove that testing for
PAC-learnability is undecidable in the Turing sense. We also briefly discuss
some of the probable implications of this result to the current practice of
machine learning
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