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  • 1
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    Computer image processing in marine resource exploration (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Pictographic data or imagery is commonly used in marine exploration. Pre-existing image processing techniques (software) similar to those used on imagery obtained from unmanned planetary exploration were used to improve marine photography and side-scan sonar imagery. Features and details not visible by conventional photo processing methods were enhanced by filtering and noise removal on selected deep-sea photographs. Information gained near the periphery of photographs allows improved interpretation and facilitates construction of bottom mosaics where overlapping frames are available. Similar processing techniques were applied to side-scan sonar imagery, including corrections for slant range distortion, and along-track scale changes. The use of digital data processing and storage techniques greatly extends the quantity of information that can be handled, stored, and processed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Annual Combined Conference on Oceans ''76; Sep 13, 1976 - Sep 15, 1976; Washington, DC
    Format: text
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  • 2
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    A model-based analysis of a display for helicopter landing approach (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A control theoretic model of the human pilot was used to analyze a baseline electronic cockpit display in a helicopter landing approach task. The head down display was created on a stroke written cathode ray tube and the vehicle was a UH-1H helicopter. The landing approach task consisted of maintaining prescribed groundspeed and glideslope in the presence of random vertical and horizontal turbulence. The pilot model was also used to generate and evaluate display quickening laws designed to improve pilot vehicle performance. A simple fixed base simulation provided comparative tracking data.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: 11th Ann. Conf. on Manual Control; p 338-355
    Format: text
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  • 3
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    Analytical display design for flight tasks conducted under instrument meteorological conditions (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A relatively straightforward, nearly algorithmic procedure for deriving model-based pilot-centered display requirements is presented. A pilot model based on modern control theory serves as the backbone of the design methodology, which is specifically directed toward the synthesis of head-down, electronic cockpit display formats. Some novel applications of the optimal pilot model are discussed, including the generation of vehicle-handling-qualities levels via numerical pilot-opinion ratings. An analytical design example is offered which aids in the definition of a format for the electronic display to be used in a UH-1H helicopter in a landing-approach task involving longitudinal and lateral degrees of freedom. It is proposed that the design procedure offers a systematic means for generating candidate display formats and flight-director laws for simulator evaluation.
    Keywords: AIRCRAFT INSTRUMENTATION
    Format: text
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  • 4
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    A rationale for human operator pulsive control behavior (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: When performing tracking tasks which involve demanding controlled elements such as those with K/s-squared dynamics, the human operator often develops discrete or pulsive control outputs. A dual-loop model of the human operator is discussed, the dominant adaptive feature of which is the explicit appearance of an internal model of the manipulator-controlled element dynamics in an inner feedback loop. Using this model, a rationale for pulsive control behavior is offered which is based upon the assumption that the human attempts to reduce the computational burden associated with time integration of sensory inputs. It is shown that such time integration is a natural consequence of having an internal representation of the K/s-squared-controlled element dynamics in the dual-loop model. A digital simulation is discussed in which a modified form of the dual-loop model is shown to be capable of producing pulsive control behavior qualitively comparable to that obtained in experiment.
    Keywords: BEHAVIORAL SCIENCES
    Type: Journal of Guidance and Control; 2; May-June
    Format: text
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  • 5
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    Prediction of pilot opinion ratings using an optimal pilot model (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A brief review of some of the more pertinent applications of analytical pilot models to the prediction of aircraft handling qualities is undertaken. The relative ease with which multiloop piloting tasks can be modeled via the optimal control formulation makes the use of optimal pilot models particularly attractive for handling qualities research. To this end, a rating hypothesis is introduced which relates the numerical pilot opinion rating assigned to a particular vehicle and task to the numerical value of the index of performance resulting from an optimal pilot modeling procedure as applied to that vehicle and task. This hypothesis is tested using data from piloted simulations and is shown to be reasonable. An example concerning a helicopter landing approach is introduced to outline the predictive capability of the rating hypothesis in multiaxis piloting tasks.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Human Factors; 19; Oct. 197
    Format: text
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  • 6
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    Broadband photoexcitation of lasers (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Existing techniques are reviewed and novel approaches for broadband photoexcitation of lasers are discussed. This subject is of interest because of the emergence of future intense near equilibrium and blackbody sources, such as the gas core reactor, and electric discharge plasma devices, which are the key to the development of intense broadband radiation sources. The possible use of radiation from solar concentrators in space also fits into this general area. The varied use of photoexcitation of lasers are discussed ranging over direct optical pumping, photodissociation, and photoreionization. In addition, the new uses of laser transitions and chemical reactions is shown. This is accomplished through multiline operation of high pressure tunable lasers which can use the broadband radiation for multiphoton excitation.
    Keywords: LASERS AND MASERS
    Type: Princeton Univ. Partially Ionized Plasmas, Including the 3rd Symp. on Uranium Plasmas; p 239-243
    Format: text
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  • 7
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    A model-based analysis of a display for helicopter landing approach (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A control theoretic model of the human pilot was used to analyze a baseline electronic cockpit display in a helicopter landing approach task and to generate display quickening laws designed to improve pilot-vehicle performance. A simple fixed base simulation provided comparative tracking data which allowed refinement of the pilot model.
    Keywords: AIRCRAFT INSTRUMENTATION
    Format: text
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  • 8
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    Dual-loop model of the human controller (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A dual-loop model of the human controller in single-axis compensatory tracking tasks is introduced. This model possesses an inner-loop closure that involves feeding back that portion of controlled element output rate that is due to control activity. A novel feature of the model is the explicit appearance of the human's internal representation of the manipulator-controlled element dynamics in the inner loop. The sensor inputs to the human controller are assumed to be system error and control force. The former can be sensed via visual, aural, or tactile displays, whereas the latter is assumed to be sensed in kinesthetic fashion. A set of general adaptive characteristics for the model is hypothesized, including a method for selecting simplified internal models of the manipulator-controlled element dynamics. It is demonstrated that the model can produce controller describing functions that closely approximate those measured in four laboratory tracking tasks in which the controlled element dynamics vary considerably in terms of ease of control. An empirically derived expression for the normalized injected error remnant spectrum is introduced.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: Journal of Guidance and Control; 1; July-Aug
    Format: text
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  • 9
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    Durability testing of advanced catalysts and catalyst supports for gas turbine engine combustors (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The paper presents new information on the durability of a CATCOM catalyst operating at low-emission combustion temperatures (about 1527 K) with a liquid fuel, No. 2 diesel. Information on the activity of No. 2 diesel after 1000 hr of aging is given. In addition, a unique in situ activity test developed for monitoring the subtle changes in the catalyst activity of the CATCOM catalyst is also detailed. The study demonstrated the feasibility of using a CATCOM catalyst in catalytically supported thermal combustion for extended operating periods
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: AIChE Symposium Series; 75; 188,; 1979
    Format: text
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  • 10
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    A dual-loop model of the human controller (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A representative model of the human controller in single-axis compensatory tracking tasks that exhibits an internal feedback loop which is not evident in single-loop models now in common use is presented. This hypothetical inner-loop involves a neuromuscular command signal derived from the time rate of change of controlled element output which is due to control activity. It is not contended that the single-loop human controller models now in use are incorrect, but that they contain an implicit but important internal loop closure, which, if explicitly considered, can account for a good deal of the adaptive nature of the human controller in a systematic manner.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: MIT Proc., 13th Ann. Conf. on Manual Control; p 44-48
    Format: application/pdf
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