Periodic Complexes and Group Actions

In this paper we show that the cohomology of a connected CW complex is periodic if and only if it is the base space of an orientable spherical fibration with total space that is homotopically finite dimensional. As applications we characterize those discrete groups that act freely and properly on a cartesian product of euclidean space and a sphere; we construct non-standard free actions of rank two simple groups on finite complexes Y homotopy equivalent to a product of two spheres and we prove that a finite p-group P acts freely on such a complex if and only if it does not contain a subgroup isomorphic to Z/p X Z/p X Z/p.Comment: Revised versio

Grazing Alfalfa: Real Cost of Fear of Bloat

In the Southeast, including legumes like alfalfa and clover in pastures provides many advantages. It reduces the impact of fescue toxicosis, provides free nitrogen, and improves pasture quality leading to increased animal performance. Individual animal performance is greater on grass/legume pastures compared to performance on similar monoculture grass stands. Daily gains for steers grazing clover-fescue swards is improved compared to straight tall fescue pastures (Figure 1). Improved performance is partially due to greater forage intakes. This practice is sound management even though legume bloat is a risk to livestock. If one considers the number of cattle grazing pastures containing legumes worldwide, the “fear of bloat” results in far greater economic losses from low beef cattle gain than the potential losses from bloat itself. In other words, if you don’t incorporate legumes into your pastures, you are leaving money on the table

Examining the Formation of Individual\u27s Privacy Concerns: Toward an Integrative View

Numerous public opinion polls reveal that individuals are quite concerned about threats to their information privacy. However, the current understanding of privacy that emerges is fragmented and usually discipline-dependent. A systematic understanding of individuals’ privacy concerns is of increasing importance as information technologies increasingly expand the ability for organizations to store, process, and exploit personal data. Drawing on information boundary theory, we developed an integrative model suggesting that privacy concerns form because of an individual’s disposition to privacy or situational cues that enable one person to assess the consequences of information disclosure. Furthermore, a cognitive process, comprising perceived privacy risk, privacy control and privacy intrusion is proposed to shape an individual’s privacy concerns toward a specific Web site’s privacy practices. We empirically tested the research model through a survey (n=823) that was administered to users of four different types of web sites: 1) electronic commerce sites, 2) social networking sites, 3) financial sites, and 4) healthcare sites. The study reported here is novel to the extent that existing empirical research has not examined this complex set of privacy issues. Implications for theory and practice are discussed, and suggestions for future research along the directions of this study are provided

A Modified Outdoor Adventure Program Serving Individuals with Cognitive Disabilities Who Present Serious Accommodation Challenges

When inclusive programming is to be offered in an outdoor adventure context, and attempts are made to welcome individuals who present disability issues that make accommodation unusually challenging, the obstacles to program success can begin to look insurmountable. Research indicates there are a number of benefits realized through participation in inclusive outdoor adventure programs (McAvoy, Schatz, Stutz, Schleien, & Lais, 1989; Anderson, Schleien, McAvoy, Lais, & Seligman, 1997; McAvoy, 2001). There has been a paucity of research focused on persons with cognitive disabilities in outdoor programs that typically go on camping excursions into wilderness or wilderness-like natural areas rather than staying in a developed camp facility. The limited research available does show that benefits can be realized through outdoor adventure programs that include persons with cognitive disabilities (Newman, 2004). Recognizing the need for further study in this area, the primary purpose of this research was to assess participant growth in social/socialization and leisure skill functioning of persons with cognitive disabilities relative to participation in a modified inclusive outdoor adventure program. The study used the Peterson and Stumbo (2000) Leisure Ability Model as a conceptual foundation for assessing programmatic outcomes

Beyond user acceptance: The determinants of the intention to produce user created contents on the internet

The advance in User Created Contents (UCCs) web sites like YouTube changed the role of Internet users from contents receivers to contents creators; a role which requires more pro-active user behaviour. However, the literature on user behaviour in information technology lacks theories that explain the pro-active user behaviour of producing and sharing UCCs with others on the Internet. This paper aims to reveal the major attributes of Internet users that have a positive impact on the intention to produce UCCs on the Internet. Extant related theories are reviewed to extract major factors of Internet users that lead to the production of UCCs. A questionnaire survey is administrated to 400 sampled respondents in South Korea to test the relationships among the identified factors. The results show that playfulness, self-expressiveness/sharing intention, innovativeness, computing skills and reward have a positive impact on the intention to produce UCCs. In particular, innovativeness turned out to have the biggest impact, while social participation is not a significant factor. Mediator variables such as age, gender and types of UCC also turned out to be playing a role in the causal relationships among the factors and the intention to produce UCCs. A model pertaining to the intention to produce UCCs online is developed and tested. The academic and practical implications of the study are also discussed in details

The Dynamics of IT Project Status Reporting: A Self-Reinforcing Cycle of Distrust

Accurate project status reporting is important to avoid the problem of information technology (IT) project escalation and to successfully manage and deliver IT projects. One approach that some organizations have taken is to audit their IT projects to avoid surprises that are frequently associated with inaccurate status reporting. Little is known, however, about the effects that such auditing arrangements can have on the dynamics of project status reporting. To examine the process of IT project status reporting in this context, we followed a grounded theory inspired approach in which we investigated nine IT projects in one U.S. state’s government agencies. All of the projects we studied were subject to the state’s IT oversight board. Based on 118 interviews with a variety of stakeholders including technical personnel, managers, users, and contractors, we present a grounded theory of project status reporting dynamics in which the reporting process can best be characterized as a self-reinforcing cycle of distrust between the project team and the auditors. Specifically, in some projects, we observed a pattern whereby project teams interpreted the auditor’s scrutiny as unfair and as not adding value to their projects. As a result, they responded by embracing some defensive reporting tactics. The auditors interpreted the project team’s actions as indicating either deception or incompetence, and they then increased their scrutiny of the reports, thus exacerbating the situation and further fuelling the cycle of distrust. We discuss implications for both theory and practice

Wavefront Sensing and Control Architecture for the Spherical Primary Optical Telescope (SPOT)

Testbed results are presented demonstrating high-speed image-based wavefront sensing and control for a spherical primary optical telescope (SPOT). The testbed incorporates a phase retrieval camera coupled to a 3-Mirror Vertex testbed (3MV) at the NASA Goddard Space Flight Center. Actuator calibration based on the Hough transform is discussed as well as several supercomputing archtectures for image-based wavefront sensing. Timing results are also presented based on various algorithm implementations using a cluster of 64 TigerShare TSlOl DSP's (digital-signal processors)

Information Privacy in a Globally Networked Society: Implications for IS Research

This paper presents an extended discussion of issues associated with the role of information privacy in IS research. This discussion was initiated in conjunction with a panel session at ICIS 2002. Following the conference, each of the panelists reworked and extended their position statements, and provided a commentary on the position statements of the other panelists. The paper is framed with head and tail pieces written by the panel chair. The result is a (unique and provocative) blend of opinion and commentary on a topic that is of importance to IS research in the globally networked society in which we all live. IS researchers will find research questions, research conundrums, and research advice in equal measure

High-Resolution Infrared Spectroscopy of the Brown Dwarf Epsilon Indi Ba

We report on the analysis of high-resolution infrared spectra of the newly discovered brown dwarf Epsilon Indi Ba. This is the closest known brown dwarf to the solar system, with a distance of 3.626 pc. Spectra covering the ranges of 2.308-2.317 microns and 1.553-1.559 microns were observed at a spectral resolution of R=50,000 with the Phoenix spectrometer on the Gemini South telescope. The physical paramters of effective temperature and surface gravity are derived by comparison to model spectra calculated from atmospheres computed using unified cloudy models. An accurate projected rotational velocity is also derived.Comment: 9 pages, 3 figures. Astrophysical Journal Letters, in pres