2,084 research outputs found

    Interoperability: A Desert Storm Case Study

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    McNair Paper 18, National Defense University, 1993

    Improvi ng Federal Informati on Systems Management: Technological Opportunityes and Social Constraints

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    The management of data processing systems in the Federal government is rapidly approaching a state of crisis.1 The Federal information systems inventory is a collection of outdated hardware as well as software techniques and systems which were abandoned 1 ong ago in the private sector. Projects have such long lead times that when systems are finally devel oped they are outmoded or no 1 onger meet current requi rements. A number of sol uti ons have been proposed which range from new rul es and procedures to i ncreased use of private contractors in delivering EDP resources. Many of the proposed solutions have more to do with the political philosophy of the proposers than with the realities of data processing management or the underlying political processes which make EDP management so complex in the government sector. This paper examines the causes of Federal FDP management problems and the political questions that must be resolved for any proposed solutions to succeed

    A model of a systems analysis study

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    The paper is concerned with a governmental decision-maker who chooses among alternatives whose costs and benefits have been illuminated analytically. The decision-maker is considered to be involved in a planning, programming and budgeting system and to be responsible for at least some area where cost-benefit studies can be helpful. The decision maker's study team is envisaged as being given an assignment to develop the alternatives and their costs and benefits. The output of the study team is some representation of a cost-benefit surface. (Author)http://archive.org/details/modelofsystemsan00joneN

    Implementation and Validation of an Impedance Eduction Technique

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    Implementation of a pressure gradient method of impedance eduction in two NASA Langley flow ducts is described. The Grazing Flow Impedance Tube only supports plane-wave sources, while the Curved Duct Test Rig supports sources that contain higher-order modes. Multiple exercises are used to validate this new impedance eduction method. First, synthesized data for a hard wall insert and a conventional liner mounted in the Grazing Flow Impedance Tube are used as input to the two impedance eduction methods, the pressure gradient method and a previously validated wall pressure method. Comparisons between the two results are excellent. Next, data measured in the Grazing Flow Impedance Tube are used as input to both methods. Results from the two methods compare quite favorably for sufficiently low Mach numbers but this comparison degrades at Mach 0.5, especially when the hard wall insert is used. Finally, data measured with a hard wall insert mounted in the Curved Duct Test Rig are used as input to the pressure gradient method. Significant deviation from the known solution is observed, which is believed to be largely due to 3-D effects in this flow duct. Potential solutions to this issue are currently being explored

    Use of virtual consultations in an orthopaedic rehabilitation setting: how do changes in the work of being a patient influence patient preferences? A systematic review and qualitative synthesis.

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    OBJECTIVES: To systematically review qualitative studies reporting the use of virtual consultations within an orthopaedic rehabilitation setting and to understand how its use changes the work required of patients. METHODS: Following the Preferred Reporting Items for Systematic Reviews and Meta-Analysis statement, we conducted a systematic review of papers to answer the research question 'How do changes in the work of being a patient when using communication technology influence patient preferences?' Electronic databases were searched for studies meeting the inclusion criteria in April 2020. RESULTS: The search strategy identified 2057 research articles from the database search. A review of titles and abstracts using the inclusion criteria yielded 21 articles for full-text review. Nine studies were included in the final analysis. Six studies explored real-time video conferencing and three explored telephone consultations. The use of communication technology changes the work required of patients. Such changes will impact on expectations for care, resources required of patients, the environment of receiving care and patient-clinician interactions. This adjustment of the work required of patients who access orthopaedic rehabilitation using communication technology will impact on their experience of receiving care. It is proposed that changes in the work of being a patient will influence preferences for or against the use of communication technology consultations for orthopaedic rehabilitation. CONCLUSION: We found that the use of communication technology changes the work of being a patient. The change in work required of patients can be both burdensome (it makes it harder for patients to access their care) and beneficial (it makes it easier for patients to access their care). This change will likely to influence preferences. Keeping the concept of patient work at the heart of pathway redesign is likely to be a key consideration to ensure successful implementation. PROSPERO REGISTRATION NUMBER: CRD42018100896

    Investigation of Liner Characteristics in the NASA Langley Curved Duct Test Rig

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    The Curved Duct Test Rig (CDTR), which is designed to investigate propagation of sound in a duct with flow, has been developed at NASA Langley Research Center. The duct incorporates an adaptive control system to generate a tone in the duct at a specific frequency with a target Sound Pressure Level and a target mode shape. The size of the duct, the ability to isolate higher order modes, and the ability to modify the duct configuration make this rig unique among experimental duct acoustics facilities. An experiment is described in which the facility performance is evaluated by measuring the sound attenuation by a sample duct liner. The liner sample comprises one wall of the liner test section. Sound in tones from 500 to 2400 Hz, with modes that are parallel to the liner surface of order 0 to 5, and that are normal to the liner surface of order 0 to 2, can be generated incident on the liner test section. Tests are performed in which sound is generated without axial flow in the duct and with flow at a Mach number of 0.275. The attenuation of the liner is determined by comparing the sound power in a hard wall section downstream of the liner test section to the sound power in a hard wall section upstream of the liner test section. These experimentally determined attenuations are compared to numerically determined attenuations calculated by means of a finite element analysis code. The code incorporates liner impedance values educed from measured data from the NASA Langley Grazing Incidence Tube, a test rig that is used for investigating liner performance with flow and with (0,0) mode incident grazing. The analytical and experimental results compare favorably, indicating the validity of the finite element method and demonstrating that finite element prediction tools can be used together with experiment to characterize the liner attenuation
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