The on-going improvement of the digital imageprocess.ng technologies together with the usage of specialised hardware has lead to the development of the system we are now introducing. The system incorporates a videose...
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The on-going improvement of the digital imageprocess.ng technologies together with the usage of specialised hardware has lead to the development of the system we are now introducing. The system incorporates a videosensor with improved capabilities on nuisance alarm discrimination based on an algorithm which combines both movement detection and object tracking with the aim of providing a wide range of criteria to program and select alarm situations. A TMS320C44 digital signal process.r from Texas Instruments Inc. carries out the videosensing algorithm, being able to process.up to fourdifferent and simultaneous video sources (CCTV cameras). The algorithm allows the usage of both local and global parameters to be applied to particularimage areas or to the whole video frame. This set of parameters include: maximum speed of the moving objects; localisation of the areas of interest (alarm zones); order of intersection of the moving objects with the alarm zones or the size of the objects along their trajectories. The other basic component of the system is based on a video codec (IIT VCP) which uses the H.263 ITU-T standard on real time video coding. The high compression rates which the H.263 accomplishes allows the transmission of real time video through low bandwidth data links (28800 to 64000 bps) and the utilisation of the IP protocol makes it feasible to integrate our system in practically any data network with a minimal investment in communication equipment.
reduced manning is the process.(and the result) of removing human functions from a system while retaining or improving system operability and effectiveness. reliability and maintainability characterize a system's ...
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reduced manning is the process.(and the result) of removing human functions from a system while retaining or improving system operability and effectiveness. reliability and maintainability characterize a system's operability and effectiveness. reduced manning impacts system reliability by changing the characteristics of (1) human error associated with system operation and maintenance, (2) time to repair failed components, and (3) mean-time-between-failures (MBTF) in a reduced manning environment. Simply reducing manning without compensating for system dependence on human involvement generally has a negative impact on system maintainability. Methods to address this include (1) human-system integration design of maintenance interfaces and (2) design of operations activities that are closely related to device failures. Afterdemonstrating reliable performance through testing and operation, ship commanders can be assured that fewer people can effectively operate and maintain Navy ships and systems.
作者：
COMSTOCK, ENKEANE, rGMr. Edward N. Comstock is currently Head of the Surface Ship Hydrodynamics Section (SEA 32132) of the Hull Form Design
Performance and Stability Branch Naval Sea Systems Command. He received his B.S.E. degree in Naval Architecture and Marine Engineering in 1970 and his M.S. degree in Ship Hydrodynamics in 1974 both from the University of Michigan. Mr. Comstock began his professional career with the U.S. Navy in 1974 as a Seakeeping Specialist in the Hull Form and Fluid Dynamics Branch of the former Naval Ship Engineering Center
being involved in improving the design of naval ships through the integration of R&D technology advances into the ship design process. His efforts prior to 1980 were mainly aimed at developing and establishing Seakeeping Performance Assessment and Design Practices. Other responsibilities have included numerous ship performance investigations in still water and in the sea environment in support of ship design and specific Fleet problems. Prior to his employment by the Navy he worked in the Structural and Hydrodynamic Groups of General Dynamics' Electric Boat Division. There his activities spanned the areas of Submarine structural and Hydrodynamic Design and Construction. A member of ASNE since 1978. he is also a member of ASE and SNAME and has been active in supporting the efforts of the SNAME H-7 (Seakeeping) Panel the National Science Foundation (NSF). and the NATO Naval Armaments Group 6/Sub-Group 5 (Seakeeping). Mr. Robert G. Keane
Jr. is presently Head of the Hull Form Design. Performance and Stability Branch (SEA 3213). Ship Design and Integration Directorate (SEA 03). Naval Sea Systems Command (NAVSEA). He received his B.E.S. degree in Mechanical Engineering from The Johns Hopkins University in 1962. his M.S. degree in Mechanical Engineering from the Stevens Institute of Technology in 1967. and his M.S.E. degree in Naval Architecture from the University of Michigan in 1970. Additionally he has done graduate work in Management Science and Operations Research at The Johns Ho
“Seakeeping … is the ability of our ships to go to sea, and Successfully and safely execute their missions despite adverse environmental factors.” — VAdm. r.E. Adamson. USN In June 1975, VAdm. r.E. Adamson, USN, t...
“Seakeeping … is the ability of our ships to go to sea, and Successfully and safely execute their missions despite adverse environmental factors.” — VAdm. r.E. Adamson. USN In June 1975, VAdm. r.E. Adamson, USN, then Commander Naval Surface Forces, U.S. Atlantic Fleet, addressed the participants of the Seakeeping Workshop [1] and established what has come to be a most profounddefinition of seakeeping as it relates to the U.S. Navy. In those few words he identified the two major issues facing the operator today and provided the focus for all subsequent seakeeping efforts within the design community at the Naval Sea Systems Command (NAVSEA). For it is these two hues of mission sum and safety at sea which are addressed within NAVSEA, for each new ship design and for ships in the Fleet, in terms of: SEAKEEPING PErFOrMANCE — Ability to execute mission in a sea environment, and SEAWOrTHINESS — Ability to survive in an extreme sea environment. In the past, the design of ships exhibiting superior seakeeping performance and seaworthiness and seaworthiness has been looked upon by many as an art or an academic exercise. The objective of this paper then is to demonstrate clearly that the ability of our ships to execute their missions successfully and safely in a sea environment is not by chance but by design.
作者：
JOHNSON, rACArACOSTAS, NPCOMSTOCK, ENMr. Robert A. Johnson is currently a Naval Architect in the Hull Group (SEA 32)
Ship Design and Integration Directorate Naval Sea Systems Command. He received his Associate in Engineering degree in Drafting and Design Technology in 1959 his B.S. degree in Aerospace Engineering in 1965 and his M.S. degree in Engineering Mechanics in 1970 all from Pennsylvania State University. In 1973
he was selected for the Navy's Long-Term Training Program at the University of Michigan from which he received his M.S.E. degree in Naval Architecture in 1974. Mr. Johnson began his professional career at the Ordnance Research Laboratory Pennsylvania State University in 1959 where he was involved in the design of hydroelastic submarine models and conducted research in the area of flow-induced structural vibrations. Subsequently he joined HRB-Singer at State College Pennsylvania in 1967 as a Research Engineer and in 1969 joined the former Naval Ship Engineering Center (NAVSEC) where he was employed in the Submarine Structures Branch Surface Ship Structures Branch and the Performance and Stability Branch of the Hull Division. Currently he is the CASDAC Hull System Technical Director and also Head of the Surface Ship Hydrodynamics Section (SEA 32133) Naval Architecture Division Naval Sea Systems Command a member of ASE
SNAME and Tau Beta Pi and one of the Navy Subcommittee Members of the Ship Structures Committee.Mr. Nicholas P. Casacostas is currently a Section Chief for Naval Architecture in the Washington
D.C. office of M. Rosenblatt & Son Inc. His professional career has been in both Navy and commercially related fields and he has had published several technical papers dealing with the subjects of Ship Propulsion and Hydrodynamics as well as Shipping Economics and Operations. A member of ASNE since 1977 he also is a member of the Royal Institute of Naval Architects and SNAME and presently serving on the latter's H-2 (Resistance and Propulsion) Panel. Mr. Edward N. Comstock is currently a Seakeeping Speciali
The recent trend in Naval Forces has been a shrinking Fleet in both numbers and ship size. This dictates that our ships must have greater operational effectiveness if the Navy is to continue to carry out its mission i...
The recent trend in Naval Forces has been a shrinking Fleet in both numbers and ship size. This dictates that our ships must have greater operational effectiveness if the Navy is to continue to carry out its mission in the future as it has done in the past. The seakeeping performance of a ship is a majordeterminant of its overall operational effectiveness. The methodology presented in this paper is a comprehensive approach to the evaluation of a ship's seakeeping performance. The scope of this methodology encompasses the assessment of ship mission scenarios and the relative importance of associated mission requirements as well as the probabilistic description of the uncertainties imposed by the variable ocean environment. The methodology is presented in a general sense so that the seakeeping performance of a ship's configuration can be evaluated as a function of mission scenario, mission area, sea state, ship heading, and speed. In order to utilize the full potential of the methodology, more refined scenario descriptions and more accurate environment specifications must be obtained. A simplified example is presented in which a comparison of the operational effectiveness of two small hull forms is made, using information now available to the designer. It is anticipated that the methodology presented can be used not only as a powerful tool in the decision-making process.of practical ship design, but also as the basis for parametric studies of mission strategies.
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