By Topic

Oceanic Engineering, IEEE Journal of

Issue 4 • Date October 1986

Filter Results

Displaying Results 1 - 12 of 12
  • [Front cover and table of contents]

    Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (170 KB)  
    Freely Available from IEEE
  • Editor's Note

    Page(s): 441
    Save to Project icon | Request Permissions | PDF file iconPDF (91 KB)  
    Freely Available from IEEE
  • Surface acoustic wave devices

    Page(s): 487 - 488
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (214 KB)  

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Page(s): c4
    Save to Project icon | Request Permissions | PDF file iconPDF (1693 KB)  
    Freely Available from IEEE
  • Lisp: An AI programming language

    Page(s): 468 - 473
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB)  

    Lisp has been the programming language of choice of most artificial intelligence (AI) researchers since the very early days of AI research. There are many reasons why this is so, some of which will be examined later in this paper, but perhaps the simplest reason is functional crispness. Every language has arbitrary features, and most languages have been overloaded with them in order to support diverse constituencies. Lisp is built around a kernel of mathematical principles which makes it far more flexible than most other (perhaps all) computer programming languages. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Expert systems: An overview

    Page(s): 442 - 448
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB)  

    "Expert systems" is a phrase that is widely used in today's literature to describe a technology that provides for emulating human reasoning processes in a computer. This paper attempts to clarify what the phrase expert systems means and briefly describes the underlying technology that is used to implement expert systems. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Guidance and control architecture for the EAVE vehicle

    Page(s): 449 - 461
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1216 KB)  

    For the past several years the Marine Systems Engineering Laboratory (MSEL) has directed its efforts towards the development of the technologies required for unmanned untethered submersible vehicles. The current focus of those efforts is to develop a system architecture that will allow the implementation of a knowledge-based guidance and control system. The goal of this effort is to implement a simple system which has addressed the basic problems and will allow for expansion as insight is gained from field testing the concepts using the Experimental Autonomous Vehicle (EAVE) system at MSEL. This paper considers those factors that have driven the development of an architecture which is being implemented in the EAVE vehicle system. Its intent is to focus on those issues that have guided the application of artificial intelligence (AI) techniques to meet the requirements of the system and its mission. The architecture being implemented is outlined and some of its features detailed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • National defense applications of autonomous underwater vehicles

    Page(s): 462 - 467
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (616 KB)  

    During the 1982 invasion of southern Lebanon, the Israeli Air Force faced the problem of neutralizing the massive Syrian air defense network in the Bekka Valley as a step in gaining air control in the area. They accomplished this, in a matter of days, without the loss of a single aircraft, while inflicting a loss of over 80 aircraft on the Syrian Air Force. The key to this smashing tactical success was the tactic used to suppress the extensive air defense network. The Israelis used remotely piloted vehicles (RPV's) for the high-risk elements of their tactical plan. RPV's conducted in-depth reconnaissance to spot and fingerprint the search and fire control radars in the valley and on adjacent mountainsides and to locate surface-to-air missile (SAM) launch sites. When the attack started, the first waves were RPV's configured to appear as attack aircraft and draw first fire. As the engagement started, manned attack fighter-bombers used antiradiation missiles (ARM's) and other smart ordnance to destroy enemy radars and launch sites as they were engaging the RPV's. While there was some loss of the low-cost RPV's, there were no losses to the Israeli aircraft. A "hornet's nest" of weapons and radars had been effectively neutralized without loss and in a period of a few hours. Recent statements of current U.S. Naval doctrine [1] emphasize a forward area strategy of naval action in or near enemy waters. The Soviet Navy in turn has been attributed as having a "bastion" strategy [2] to operate their SLBM force in Arctic waters and heavily defend the sea approaches to these waters. In other words, we postulate that they will create a "hornet's nest" and the U.S. Navy would intend to attack it, a Naval "Bekka Valley." This article examines the potential need for unmanned systems in the execution of the forward-area strategy. Emphasis is upon medium- and long-range submersibles capable of autonomous operation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Measurement of seabed topography by multibeam sonar using CFFT

    Page(s): 474 - 479
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (568 KB)  

    A precise ocean bottom map for ocean surveying and dredging is desired. Especially in dredging, it is essential to know the seabed topography in real time without being affected by scatterers (for example floating sand and mud) in the seawater during work. To meet these requirements, the multi-narrow-beam sonar system (MBSS) has been developed. The MBSS forms beams with the use of the complex fast Fourier transform (CFFT) algorithm. In the MBSS, arithmetic mean processing is employed to eliminate echo from scatterers and the measurement error due to the oblique incident angle is reduced by peak value detection processing. By using these processes, an ocean bottom map can be accurately obtained. It is both theoretically and experimentally shown that the distribution of echo intensity from scatterers is approximated by the Rayleigh probability density function. The arithmetic mean of four to eight successively received echoes from scatterers reduces the variance of the echo intensity distribution by 6 to 12 dB. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A comparison of the temperature coefficients of electrical conductivity of Atlantic and Pacific seawaters

    Page(s): 485 - 486
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    The Practical Salinity Scale 1978 (PSS) defines the relationship among salinity, electrical conductivity, temperature, and pressure. Strictly speaking, the PSS is only applicable to waters with the same relative chemical composition as standard seawater. We have tested the predictions of the PSS for samples of Atlantic and Pacific waters. The results indicate that the PSS is valid for these natural seawaters over the defined temperature range of the scale. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Near-neutral drag coefficients over open-ocean waves

    Page(s): 480 - 484
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    Reanalysis of open-ocean eddy-correlation drag coefficients observed at Argus Island Tower near Bermuda indicates that near-neutral drag coefficients decrease with increasing mean horizontal wind velocity when the dominant (spectral peak) ocean wave phase velocity is much greater than the mean wind velocity. Near-neutral drag coefficients attain constant values when the dominant wave phase velocity approaches mean wind velocity, and increase again when mean wind velocity is greater than or equal to dominant wave phase velocity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

The IEEE Journal of Oceanic Engineering (ISSN 0364-9059) is published quarterly by the IEEE Oceanic Engineering Society (IEEE OES). The scope of the Journal is the field of interest of the IEEE OES, which encompasses all aspects of science, engineering, and technology that address research, development, and operations pertaining to all bodies of water. This includes the creation of new capabilities and technologies from concept design through prototypes, testing, and operational systems to sense, explore, understand, develop, use, and responsibly manage natural resources.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
N. Ross Chapman
School of Earth & Ocean Sciences
University of Victoria
3800 Finnerty Road
Victoria, BC V8P 5C2 Canada
chapman@uvic.ca