Organization:
Graduate School of Operational and Information Sciences (GSOIS)

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2022
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Publication Search Results

Now showing 1 - 10 of 2265
  • Publication
    Preliminary results concerning the improvements realizable through the use of variable thrust together with engine gimbaling for a particular interceptor missile
    (Monterey, California. Naval Postgraduate School, 1973-09) Russak, Ira Bert; Operations Research (OR); Graduate School of Operational and Information Sciences (GSOIS)
    Some interceptor missiles as presently formulated possess a programmed thrust magnitude history with a gimbaled engine to provide steering. We examine one such missile to determine whether performance can be improved if we allow a variable thrust magnitude together with engine gimbaling to provide control. Two trajectory optimization programs were written to provide an initial answer to this problem. Preliminary results indicate reductions in the time to intercept by as much as thirty percent over that obtained by the presently used guidance scheme. With tuning of the programs it seems reasonable to expect even greater improvements and further investigation seems warranted. (Author)
  • Publication
    Periodic and log periodic coupling of modes of propagation
    (Monterey, California. Naval Postgraduate School, 1971-08) Knorr, Jeffrey B.; Operations Research (OR); Graduate School of Operational and Information Sciences (GSOIS)
    The report summarizes an investigation of the applicability of the log periodic concept to coupled microwave transmission lines. It is shown that active coupling at a given frequency may be achieved between two lines supporting waves with different phase constants provided they are coupled periodically with a periodicity determined by the difference B(2)-B(1) at that frequency. Since B(2)-B(1) will, in general, vary with frequency, coupling over a broad frequency range requires a variable period. This may be realized by scaling the structure period, thereby giving rise to a log periodic mode coupler. This technique appears to hold promise for achieving the same wideband performance that has been attained with log periodic radiators. (Author)
  • Publication
    Temperature Distributions in Thin Circular Disks with Variable Thickness, Thermal Conductivity, and Heat Transfer Coefficient (A Direct Variational Approach using Rayleigh Ritz Approximation)
    (Monterey, California. Naval Postgraduate School, 1966) Clark, Larry T.; Operations Research (OR); Graduate School of Operational and Information Sciences (GSOIS); Aeronautics
    An approximate solution for the temperature distribution in a thin circular disk having variable thermal properties, variable thickness, and a variable surface heat transfer coefficient is presented. The method used was to cast the governing differential equation into the equivalent variational problem and solve using the direct method of Rayleigh Ritz . Agreement between the approximate solution and an exact solution for the case of a constant thickness disk with constant properties was excellent. A simple computer program which may be used to evaluate the temperature profiles is provided.
  • Publication
    Introduction to acoustic signal processing
    (Monterey, California. Naval Postgraduate School, 1977-11) Sackman, George L.; Davis, William O.; Donaldson, Paul H.; Operations Research (OR); Graduate School of Operational and Information Sciences (GSOIS)
    Acoustic Signal processing is a short course in electrical signal processing fundamentals and their applications in the field of underwater acoustics. It contains an introduction to Fourier transforms and their properties, sampling and quantization, filters and bandwidth requirements, random signals and noise, and an introduction to four types of processing equipment; the DELTIC, energy detectors, correlation detectors, and beamformers. Course objectives are given in terms of specific questions which a person completing the course should be able to answer. The course is designed to be presented to the personnel involved with the development, operation and employment of acoustic sensors to provide them with a better understanding of the operations accomplished by their equipment and to develop in them a better appreciation of the problems and limitations associated with signal detection in the underwater environment
  • Publication
    Investigation of the spin stability of the NPS Mini-Satellite (ORION)
    (Monterey, California. Naval Postgraduate School, 1987) Kim, Kilsoo S.; Shin, Y. S.; Operations Research (OR); Graduate School of Operational and Information Sciences (GSOIS)
    A preliminary design of the Naval Postgraduate School Mini-Satellite consists of a long cylindrical body and four radial booms and uses the single spin stabilization scheme for its attitude control. Stability conditions between design parameters for simple spinning motions of the satellite in space are investigated by applying Liapunov stability theory and using the natural modes as the admissible functions of internal coordinates. The stability diagram from this study shows that the internal stability conditions due to the flexibility of booms limit the angular velocity range of simple spins whlie the Maximum Axis Rule limit the minimum lengths of booms.
  • Publication
    A Conceptual Level Design for a Static Scheduler for Hard Real-Time Systems
    (Naval Postgraduate School, 1988) Luqi; O'Hern, J.; Computer Science (CS); Graduate School of Operational and Information Sciences (GSOIS); Computer Science (CS)
    This report builds upon work previously done in the development of the Computer Aided Prototyping System (CAPS) and the Prototype System Description Language (PSDL) and presents a conceptual design for the pioneer prototype of the static scheduler which is part of the CAPS execution support system. The design of hard real-time systems is gaining a great deal of attention in the software engineering field as more and more realworld processes are becoming automated. This increase in automation identified a need for the advancement of software design technology to meet the design requirements for these hard real-time systems. The CAPS and PSDL are tools being developed to aid the software designer in the rapid prototyping of hard real-time systems. PSDL, as an executable design language, is supported by an execution support system consisting of a static scheduler, dynamic scheduler, and translator. The static scheduler design ineludes the scheduling algorithms required to schedule time critical time critical operators contained in a PSDL prototype in such a way that all operator timing constraints and precedence relationships are met to produce a feasible static schedule if one is possible. Implementation of the conceptual design will be the basis for further work in this area.
  • Publication
    SEA Environment for CARA Software
    (Monterey, California. Naval Postgraduate School, 2002-09) Luqi; Shing, M.; Berzins, V.; Puett, J.; Guan, Z.; Qiao, Y.; Zhang, L.; Chaki, N.; Liang, X.; Ray, W.; Brown, M.; Floodeen, D.; Drusinsky, D.; Computer Science (CS); Graduate School of Operational and Information Sciences (GSOIS); Computer Science (CS)
    This report summarizes our prototyping effort for the Infusion Pump Computer Assisted Resuscitation Algorithm (CARA) software. Computer aided prototyping (CAP) shows promise that one system under development frees designers from implementation details by executing specifications via reusable components. In constructing distributed embedded real-time systems, the formal specifications can facilitate recording and enforcing timing constraints by providing underlying compositional architecture, restricted real-time scheduling and reusable execution base. This effort takes the computer assisted resuscitation algorithm (CARA) software for the infusion pump as the studying case, and presents different versions that model the CARA with specific focuses, such as simplicity of the design, safety-aspects, requirements coverage, enabling architecture, and so forth. Finally the evaluation on CARA requirements and on the language for prototyping complex systems and its associated tools is also provided.
  • Publication
    Lines of Effort COL John Crisafulli
    (Monterey, California: Naval Postgraduate School, 2020-03) Crisafulli, John; Defense Analysis (DA); Graduate School of Operational and Information Sciences (GSOIS); Defense Analysis (DA)
  • Publication
    War In Chechnya: Implications for Russian Security Policy
    (Monterey, California. Naval Postgraduate School, 1996-07) Tsypkin, Mikhail; Arutiunov, Sergei A.; Belkin, Alexander A.; Felgenhauer, Pavel; Shlykov, Vitaly V.; Averchev, Vladimir P.; Operations Research (OR); Graduate School of Operational and Information Sciences (GSOIS); National Security Affairs
    Features papers from the War in Chechnya Conference, which was held at the Naval Postgraduate School in Monterey, California on November 7 and 8, 1995. Includes discussions on the consequences of the war, the impact on civil-military relations, and the implications for military reform. Introductions and acknowledgements Mikhail Tsypkin. -- Ch. 1. Possible consequences of the Chechnya War for the general situation in the Caucasus. Sergei A. Arutiunov. -- Ch. 2. War in Chechnya: the impact on civil-military relations in Russia. Alexander A. Belkin. -- Ch. 3. The Chechen campaign. Pavel Felgenhauer. -- Ch. 4. The war in Chechnya: the implications for military reform and the creation of mobile forces. Vitaly V. Shlykov. -- Ch. 5. The Chechnya War and a crisis of Russian statehood. Vladimir P. Averchev.
  • Publication
    A Game Theoretic Model of Strategic Conflict in Cyberspace
    (2012-01) Schramm, Harrison; Alderson, David L.; Carlyle, W. Matthew; Dimitrov, Nedialko B.; Operations Research (OR); Graduate School of Operational and Information Sciences (GSOIS); Operations Research