357 research outputs found

    Computer simulation of on-orbit manned maneuvering unit operations

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    Simulation of spacecraft on-orbit operations is discussed in reference to Martin Marietta's Space Operations Simulation laboratory's use of computer software models to drive a six-degree-of-freedom moving base carriage and two target gimbal systems. In particular, key simulation issues and related computer software models associated with providing real-time, man-in-the-loop simulations of the Manned Maneuvering Unit (MMU) are addressed with special attention given to how effectively these models and motion systems simulate the MMU's actual on-orbit operations. The weightless effects of the space environment require the development of entirely new devices for locomotion. Since the access to space is very limited, it is necessary to design, build, and test these new devices within the physical constraints of earth using simulators. The simulation method that is discussed here is the technique of using computer software models to drive a Moving Base Carriage (MBC) that is capable of providing simultaneous six-degree-of-freedom motions. This method, utilized at Martin Marietta's Space Operations Simulation (SOS) laboratory, provides the ability to simulate the operation of manned spacecraft, provides the pilot with proper three-dimensional visual cues, and allows training of on-orbit operations. The purpose here is to discuss significant MMU simulation issues, the related models that were developed in response to these issues and how effectively these models simulate the MMU's actual on-orbiter operations

    Beyond rules: The next generation of expert systems

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    The PARAGON Representation, Management, and Manipulation system is introduced. The concepts of knowledge representation, knowledge management, and knowledge manipulation are combined in a comprehensive system for solving real world problems requiring high levels of expertise in a real time environment. In most applications the complexity of the problem and the representation used to describe the domain knowledge tend to obscure the information from which solutions are derived. This inhibits the acquisition of domain knowledge verification/validation, places severe constraints on the ability to extend and maintain a knowledge base while making generic problem solving strategies difficult to develop. A unique hybrid system was developed to overcome these traditional limitations

    Klinik ilaç araştırmalarından doğan sorumluluk

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    Klinik ilaç araştırmaları, yeni tedavi yöntemlerinin bulunabilmesi için, bir zorunluluktur. Ancak doğuracağı sakıncalar gözden uzak tutulmamalıdır. Zira araştırmanın uygulandığı kişi, bu araştırmalar sebebiyle, birçok zarara uğrayacaktır. Dolayısı ile ilaç araştırması ve gönüllünün hakları arasında ince bir çizgi vardır. Bu ince çizginin aşılmaması, bir takım sıkı koşulların gerçekleşmesi ile mümkündür. Aksi takdirde, gönüllüye karşı araştırmayı yapanların hukuki ve cezai sorumlulukları gündeme gelecektir. Çalışmamız ise, yalnızca ilaç araştırmasından doğan hukuki sorumluluğu konu edinmektedir

    UA12/2/66 Sigma Kappa

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    Records created by and about Sigma Kappa sorority

    La socialisation aux valeurs spirituelles religieuses et civiques : du civique au spirituel

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    Toward A Multidimensional Model Of Social Interaction As Related To Conflict Resolution Theory

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    One of the themes in the study of social theory, throughout its history, has been the examination of the social forces of agency and structure

    International bean trials : Broad classification of CIAT international bean trials

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    Senate Minutes 9-17-92

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