C-SIDE: The control-structure interaction demonstration experiment

The Control-Structure Interaction Demonstration Experiment (C-SIDE) is sponsored by the Electro-Optics and Cryogenics Division of Ball Aerospace Systems Group. Our objective is to demonstrate methods of solution to structure control problems utilizing currently available hardware in a system that is an extension of our corporate experience. The larger space structures with which Ball has been associated are the SEASAT radar antenna, Shuttle Imaging Radar (SIR) -A, -B and -C antennas and the Radarsat spacecraft. The motivation for the C-SIDE configuration is to show that integration of active figure control in the radar's system-level design can relieve antenna mechanical design constraints. This presentation is primarily an introduction to the C-SIDE testbed. Its physical and functional layouts, and major components are described. The sensor is of special interest as it enables direct surface figure measurements from a remote location. The Remote Attitude Measurement System (RAMS) makes high-rate, unobtrusive measurements of many locations, several of which may be collocated easily with actuators. The control processor is a 386/25 executing a reduced order model-based algorithm with provision for residual mode filters to compensate for structure interaction. The actuators for the ground demonstration are non-contacting, linear force devices. Results presented illustrate some basic characteristics of control-structure interaction with this hardware. The testbed will be used for evaluation of current technologies and for research in several areas. A brief indication of the evolution of the C-SIDE is given at the conclusion

Insights from a Real Options Approach to Evaluate IT Sourcing Decisions

The trend for businesses to outsource information technology (IT) resources remains a relevant topic among IS researchers (Hirschheim and Lacity 2000, Kern & Blois 2002, Yost & Harmon 2002, Dibbern et al. 2004). While much has been written about outsourcing, the literature is relatively sparse when contemplating the issue of how organizations actually make their IT sourcing decisions. These sourcing decisions present the firm with opportunities such as abandonment, expansion, and deferment, that provide management the flexibility to improve their sourcing portfolios in the future. Real options theory has proven useful for valuing investments in IT infrastructure because it assigns value to future potential (Benaroch and Kauffan 1999, Taudes et al. 2000). This real options approach (ROA) is a promising technique for obtaining insights to sourcing decisions under uncertainty. This paper will relate the benefits of using real options analysis to evaluate the 5 stages of the IS outsourcing decision identified by Dibbern et al. (2004)

Type Ia supernova diversity: Standardizing the candles

Future use of type Ia supernovae for cosmology aims not only to determine the equation of state of dark energy, but also to constrain possible variations in its value. To achieve this goal, supernovae need to become better calibrated standard candles - not only to improve the precision of the measurement, but more importantly to gain better control over systematic uncertainties in order to ensure the accuracy of the result. Here we report on a project to quantify the diversity in type Ia supernovae, and to look for trends and/or sub-types that can be used to improve their calibration as standard candles. We implement a version of principal component analysis on type Ia supernova spectra. Although the quantity of data is not sufficient to draw any firm conclusions we show that this method holds promise for, at the very least, effectively separating peculiar supernovae. Whether it can be further used to improve the calibration of normal type Ia's remains a project for future study.Comment: Conference Proceedings. Cefalu 2006, The multicoloured landscape of compact objects and their explosive origins. Six pages, three figure

State of the Art: Why do the lungs of patients with cystic fibrosis become infected and why can't they clear the infection?

Cystic Fibrosis (CF) lung disease, which is characterized by airway obstruction, chronic bacterial infection, and an excessive inflammatory response, is responsible for most of the morbidity and mortality. Early in life, CF patients become infected with a limited spectrum of bacteria, especially P. aeruginosa. New data now indicate that decreased depth of periciliary fluid and abnormal hydration of mucus, which impede mucociliary clearance, contribute to initial infection. Diminished production of the antibacterial molecule nitric oxide, increased bacterial binding sites (e.g., asialo GM-1) on CF airway epithelial cells, and adaptations made by the bacteria to the airway microenvironment, including the production of virulence factors and the ability to organize into a biofilm, contribute to susceptibility to initial bacterial infection. Once the patient is infected, an overzealous inflammatory response in the CF lung likely contributes to the host's inability to eradicate infection. In response to increased IL-8 and leukotriene B(4 )production, neutrophils infiltrate the lung where they release mediators, such as elastase, that further inhibit host defenses, cripple opsonophagocytosis, impair mucociliary clearance, and damage airway wall architecture. The combination of these events favors the persistence of bacteria in the airway. Until a cure is discovered, further investigations into therapies that relieve obstruction, control infection, and attenuate inflammation offer the best hope of limiting damage to host tissues and prolonging survival

Applicability to Assignees of Doctrine of Practical Construction of Contracts

The courts resort to established rules of interpretation for assistance in solving the doubts found in ambiguous contracts. The cardinal rule of interpretation is that the court must endeavor to ascertain and give effect to the intention of the parties to the contract at the time of the making of the contract. Intention can not be proved by direct and positive evidence. It is a question of fact to be proved like any other fact, by acts, conduct and circumstances . Thus the issue, the intention of the parties to the contract at the time of the making of the contract, is an issue of fact to be proved like any other fact. Relevant evidence is admissible—irrelevant evidence is not

The United States Chiropractic Workforce: An alternative or complement to primary care?

UnlabelledBackgroundIn the United States (US) a shortage of primary care physicians has become evident. Other health care providers such as chiropractors might help address some of the nation's primary care needs simply by being located in areas of lesser primary care resources. Therefore, the purpose of this study was to examine the distribution of the chiropractic workforce across the country and compare it to that of primary care physicians.MethodsWe used nationally representative data to estimate the per 100,000 capita supply of chiropractors and primary care physicians according to the 306 predefined Hospital Referral Regions. Multiple variable Poisson regression was used to examine the influence of population characteristics on the supply of both practitioner-types.ResultsAccording to these data, there are 74,623 US chiropractors and the per capita supply of chiropractors varies more than 10-fold across the nation. Chiropractors practice in areas with greater supply of primary care physicians (Pearson's correlation 0.17, p-value < 0.001) and appear to be more responsive to market conditions (i.e. more heavily influenced by population characteristics) in regards to practice location than primary care physicians.ConclusionThese findings suggest that chiropractors practice in areas of greater primary care physician supply. Therefore chiropractors may be functioning in more complementary roles to primary care as opposed to an alternative point of access

Strategic transformation process: Toward purpose, people, process and power

Across the world, public and non-profit sector leaders face an extremely turbulent socio-political-economic environment. This environment creates additional risks and uncertainties for organizations and may hinder a leader’s ability to act strategically. Addressing these complex, constantly evolving conditions requires leaders to develop processes that involve the organization’s stakeholders and that create organizational conditions for self-generation, creativity, resilience and action planning. In this paper we provide an organizational-level, integrative framework for the strategic transformation of public and non-profit organizations to assist leaders who are committed to effective stewardship of their organizations. The Strategic Transformation Process involves an intense dialogue among organizational stakeholders designed to create a new vision, negotiate priorities, minimize risk, and create action plans and a commitment for change

Expectations and Experiences of Short-Term Study Abroad Leadership Teams

This paper explores the expectations and experiences of faculty, academic advisors, and graduate students leading a study abroad experience for first-year engineering students. In the current age of globalization, engineering students require a global understanding of engineering to be competent in the global workforce. In response, undergraduate engineering programs have created various programs to fill this student need. The research surrounding these initiatives focuses on the student experience but is limited when describing that of program leaders. This qualitative study draws from track leader journals that were completed during and shortly after the international program as well as semi-structured interviews in the following semester. The findings suggest that the majority of leaders expected their role to be that of an educator on the study abroad experience, but upon reflection, realized that their definition of what it means to be an educator expanded to encompass facilitation of learning. Many of the student learning instances leaders pointed to had to do with facilitating a learning environment rather than delivering content or answering technical questions. The roles described by leaders varied from troubleshooter to behavioral manager to informer. Leaders reflected that their roles developed as they met students where they were in their learning within the dynamic international context of the program. Overall, leaders saw their roles evolve over the course of the trip. The findings shed light on emergent power dynamics that leadership teams engage in outside of the formal learning environment and provide a unique insight into the types of learning program leaders can experience through leading study abroad programs. The multiple forms of data collection provide deeper insights into the experiences of the leaders while encouraging them to also reflect in real-time. This study has implications for the development of intentionally designed, condensed study-abroad experiences that draws from understanding the program leaders’ experience

Augmenting the Human Capital Earnings Equation with Measures of Where People Work

We augment standard log earnings equations for workers in US manufacturing with variables reflecting measured and unmeasured attributes of their employer. Using panel employee-establishment data, we find that establishment-level employment, education of coworkers, capital equipment per worker, and firm-level R&D intensity affects earnings substantially. Unobserved characteristics of employers captured by employer fixed effects also contribute to the variance of log earnings, although less than unobserved characteristics of individuals captured by individual fixed effects. The observed and unobserved measures of employers mediate the effects of individual characteristics on earnings and increase earnings inequality through sorting of workers among establishments