iCloudECG: A Mobile Cardiac Telemedicine System

With rising healthcare costs and a substantially growing number of patients 65 or over, the benefits of telemedicine and patient self-monitoring systems are becoming increasingly evident. Patients, physicians, hospitals, and even insurance providers benefit from vigilant, cost-effective patient monitoring systems. This thesis describes the development of a portable, smart-phone connected system for continuous cardiac monitoring. The system is capable of continuously monitoring the conditions of the heart, automated detection of cardiac arrhythmias, and real-time notifying patients and physicians of the detected abnormalities. The system consists of four main subsystems: 1) a Bluetooth capable chest-strap ECG, 2) an Android-enabled mobile device, 3) a cloud-based analysis, storage, and notification system, and 4) a web-application portal. Data is collected by the single-lead ECG device, and transmitted to the mobile device via Bluetooth. An application allows the patient to view their ECG output in real-time, view the last 24 hours of recordings, and receive notifications and details regarding any detected abnormalities. The mobile device transmits the ECG data to a remote server for pre-processing and analysis, and then stores the data in a database which the patient or physician can access via a web-interface. The developed system can be used as a telemedicine system for management of cardiovascular diseases

Off-surface infrared flow visualization

A method for visualizing off-surface flows is provided. The method consists of releasing a gas with infrared absorbing and emitting characteristics into a fluid flow and imaging the flow with an infrared imaging system. This method allows for visualization of off-surface fluid flow in-flight. The novelty of this method is found in providing an apparatus for flow visualization which is contained within the aircraft so as not to disrupt the airflow around the aircraft, is effective at various speeds and altitudes, and is longer-lasting than previous methods of flow visualization

FORMAL SEMANTICS FOR TIME IN DATABASES

The concept of an historical database is introduced as a tool for modelling the dynamic nature of some part of the real world. Just as first-order logic has been shown to be a useful formalism for expressing and understanding the underlying semantics of the relational database model, intensional logic is presented as an analogous formalism for expressing and understanding the temporal semantics involved in an historical database. The various components of the relational model, as extended to include historical relations, are discussed in terms of the model theory for the logic ILs, a variation of the logic IL formulated by Richard Montague. The modal concepts of intensional and extensional data constraints and queries are introduced and contrasted. Finally, the potential application of these ideas to the problem of Natural Language Database Querying is discussed.Information Systems Working Papers Serie

Managing Insects on Texas Peanuts.

7 p

THE CODE: A SHORT QUESTIONNAIRE FOR IDENTIFYING CO-DEPENDENCY AMONG UNIVERSITY STUDENTS

A paper using this instrument is found at: http://hdl.handle.net/2022/17418. Other papers on student alcohol issues can be found at: https://scholarworks.iu.edu/dspace/handle/2022/17130/browse?type=title; https://scholarworks.iu.edu/dspace/handle/2022/17127/browse?type=title and https://scholarworks.iu.edu/dspace/handle/2022/17124/browse?type=title. The CODE Manual is found at http://hdl.handle.net/2022/17418. The CODE questionnaire is found at: http://hdl.handle.net/2022/17248 . ALL QUESTIONNAIRES developed by Engs are found in the repository at: https://scholarworks.iu.edu/dspace/handle/2022/17141/browse?type=dateissuedPURPOSE: the purpose of this study was to develop an instrument to predict co-dependency problems among university students to assist psychologists, counselors, health educators, and student personnel staff to determine if a student might have a family background of alcoholism without directly asking as some students are in denial concerning family alcoholism. METHODS: A literature search revealed 63 variables associated with those who had alcoholism in their immediate families sometimes called “co-dependents.” Individuals were classified as Co-Dependent if they indicated that either a parent or grandparent had sometimes or often drank too much. Individuals were classified as non-co-dependent if all relatives had never or only sometimes drank. Content validity for questionnaire development was determined by a jury of over 30 professions in the field of alcohol and drugs. Then the instrument was administered to an undergraduate class of 100 university students who were asked to comment on the items. Next 15 self-identified co-dependents attending a seminar on co-dependency were asked to comment on the items. A four-point Likert scale was developed. The finalized version was sent to four universities who volunteered assistance. After elimination of items due to non-significant differences between co- and non-co-dependents or items with reliability less than .3, eleven items remained. For these 11 items, a mean score was determined for each individual. Factor analysis revealed two factors which accounted for 59% of the variance. Since the reliability between both factors was .8, it was decided that one factor could be used for a total score. Spearman-Brown split half technique for internal consistency found a reliability coefficient of .87 and the Cronbach alpha test for homogeneity resulted in an alpha of .89. Discriminate analysis correctly classified individuals as co-depended 69% of the time. Cross validation between two forms of the check list found no significant difference between any items. A highly significant difference was found between co- and non-co-dependents on both forms. RESULTS AND CONCLUSION: These procedures indicated that this eleven items instrument was highly reliable, had high internal consistency and could correctly predict a person’s co-dependency - or family background of alcoholism - status approximately 70% of the time. The instrument also could be used intact or embedded with other items and is useful to identify familial alcoholism

Factors Influencing Willingness-to-Pay for the Energy Star Label

In the United States, nearly 17 percent of greenhouse gas emissions come from residential energy use. Increases in energy efficiency for the residential sector can generate significant energy savings and emissions reductions. Consumer labels, such as USEPA’s Energy Star, promote conservation by providing consumers with information on energy usage for household appliances. This study examines how the Energy Star label affects consumer preferences for refrigerators. An online survey of a national sample of adults suggest that consumers are, on average, willing to pay an extra $249.82 to$349.30 for a refrigerator that has been awarded the Energy Star label. Furthermore, the results provide evidence that willingness to pay was motivated by both private (energy cost savings) and public (environmental) benefits.Energy Star, willingness-to-pay, eco-label, Consumer/Household Economics, Demand and Price Analysis, Environmental Economics and Policy,

Stellar Dynamics of Extreme-Mass-Ratio Inspirals

Inspiral of compact stellar remnants into massive black holes (MBHs) is accompanied by the emission of gravitational waves at frequencies that are potentially detectable by space-based interferometers. Event rates computed from statistical (Fokker-Planck, Monte-Carlo) approaches span a wide range due to uncertaintities about the rate coefficients. Here we present results from direct integration of the post-Newtonian N-body equations of motion descrbing dense clusters of compact stars around Schwarzschild MBHs. These simulations embody an essentially exact (at the post-Newtonian level) treatment of the interplay between stellar dynamical relaxation, relativistic precession, and gravitational-wave energy loss. The rate of capture of stars by the MBH is found to be greatly reduced by relativistic precession, which limits the ability of torques from the stellar potential to change orbital angular momenta. Penetration of this "Schwarzschild barrier" does occasionally occur, resulting in capture of stars onto orbits that gradually inspiral due to gravitational wave emission; we discuss two mechanisms for barrier penetration and find evidence for both in the simulations. We derive an approximate formula for the capture rate, which predicts that captures would be strongly disfavored from orbits with semi-major axes below a certain value; this prediction, as well as the predicted rate, are verified in the N-body integrations. We discuss the implications of our results for the detection of extreme-mass-ratio inspirals from galactic nuclei with a range of physical properties.Comment: 28 pages, 16 figures. Version 2 is significantly revised to reflect new insights into J and Q effects, to be published late

Non-equilibrium microtubule fluctuations in a model cytoskeleton

Biological activity gives rise to non-equilibrium fluctuations in the cytoplasm of cells; however, there are few methods to directly measure these fluctuations. Using a reconstituted actin cytoskeleton, we show that the bending dynamics of embedded microtubules can be used to probe local stress fluctuations. We add myosin motors that drive the network out of equilibrium, resulting in an increased amplitude and modified time-dependence of microtubule bending fluctuations. We show that this behavior results from step-like forces on the order of 10 pN driven by collective motor dynamics

Intelligent chilled mirror humidity sensor

A new, intelligent, chilled mirror humidity instrument has been designed for use on buoys and ships. The design goal is to make high quality dew point temperature measurements for a period of up to one year from an unattended platform, while consuming as little power as possible. Nominal system accuracy is 0.3°C, and a measure of data quality is provided to indicate possible drift in calibration. Energy consumption is typically 800 Joules per measurement; standby power consumption is 0.05 watts. Control of the instrument is managed by an onboard central processing unit which is programmable in BASIC, and communication to an external data logger is provided through an RS232 compatible interface. This report describes the preliminary sensor tests that led to this new design and provides the complete technical description required for fabrication.Funding was provided by the Office of Naval Research under contract Number N00014-84-C-0134, and the National Science Foundation through grant Number OCE87- 09614

Mixing of Multiple Jets with a Confined Subsonic Crossflow in a Cylindrical Duct

This paper summarizes NASA-supported experimental and computational results on the mixing of a row of jets with a confined subsonic crossflow in a cylindrical duct. The studies from which these results were derived investigated flow and geometric variations typical of the complex 3-D flowfield in the combustion chambers in gas turbine engines. The principal observations were that the momentum-flux ratio and the number of orifices were significant variables. Jet penetration was critical, and jet penetration decreased as either the number of orifices increased or the momentum-flux ratio decreased. It also appeared that jet penetration remained similar with variations in orifice size, shape, spacing, and momentum-flux ratio when the number of orifices was proportional to the square-root of the momentum-flux ratio. In the cylindrical geometry, planar variances are very sensitive to events in the near wall region, so planar averages must be considered in context with the distributions. The mass-flow ratios and orifices investigated were often very large (mass-flow ratio greater than 1 and ratio of orifice area-to-mainstream cross-sectional area up to 0.5), and the axial planes of interest were sometimes near the orifice trailing edge. Three-dimensional flow was a key part of efficient mixing and was observed for all configurations. The results shown also seem to indicate that non-reacting dimensionless scalar profiles can emulate the reacting flow equivalence ratio distribution reasonably well. The results cited suggest that further study may not necessarily lead to a universal 'rule of thumb' for mixer design for lowest emissions, because optimization will likely require an assessment for a specific application