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THE SURFACE EFFECT CATAMARAN - PROGRESS IN CONCEPT ASSESSMENT

NAVAL ENGINEERS JOURNAL 1983年第3期95卷 301-311页

作者： WILSON, FW VIARS, PR ADAMS, JD Fred W. Wilson:received his B.A. degree from the Virginia Polytechnic Institute and State University in 1967 and his M.A. degree from the University of Tennessee in 1971. Mr. Wilson has been involved with air-supported vehicle technology at the Aviation and Surface Effects Department of the David Taylor Naval Ship Research and Development Center since 1967. Until 1979 Mr. Wilson was with the Surface Effect Ship Division and participated in early SES development the SES-100A and -100B trials and in the 3000-ton SES program. Since 1979 Mr. Wilson has been in the Program Development Office participating in aircraft programs as well as the current twin-cushion surface effect ship (Surface Effect Catamaran) program. Philip R. Viars:graduated from the University of Cincinnati with a B.S. in Aerospace Engineering in 1974. He received his M.S. in Ocean and Marine Engineering from George Washington University in 1980. Since 1972 Mr. Viars has worked in the Aviation and Surface Effects Department at the David Taylor Naval Ship Research and Development Center (DTNSRDC). While at DTNSRDC Mr. Viars has participated in model and full-scale experimental programs focused on simulation. Mr. Viars is recognized as the Center expert in SES stability and performance having participated in most of the manned Navy SES testcraft evaluations. Since 1981 Mr. Viars has been in the Program Development Office where he has worked on the twin-cushion surface effect ship (SECAT) and other programs. John D. Adams:received his B.S.E. in 1972 from the University of Michigan School of Naval Architecture and Marine Engineering. He has spent seven years in Marine engineering research Marine systems design and development and dynamic tow tank testing and data analysis. Mr. Adams is currently responsible for the Maritime Dynamics Inc. field operation at the U.S. NavySES Test Facility (SESTF) Patuxent River Maryland. On-site responsibility has been the design development and manned testing of active ride control systems for the U.S. NavyXR-

The surface effect catamaran incorporates twin high length-to-beam cushions to support a low length-to-beam platform. The performance characteristics of the resulting vehicle, i.e., the resistance and head sea motions, are equivalent to a higher length-to-beam surface effect ship. The high lateral stability which results from the widely spaced hulls and cushions of the surface effect catamaran provides several advantages not inherent in conventional surface effect ship configurations. These advantages are manifested by high cross-structure height and reduced structural loads without reduction in static or dynamic roll stability. For an 800-ton ship the widely spaced cushions provide a capability of controlling off-head sea types of motions and the virtual elimination of green water over the deck up through Sea State 6. Model tests have validated cushionborne and hullborne resistance computer prediction programs. Head sea motions tests have justified the use of high cross-structure height to minimize high slam types of structural loads. Preliminary design and model tests indicate the potential for the surface effect catamaran to operate as an open ocean ship in smaller sizes than heretofore thought possible. In addition, its planform and large volume provides pay-load capabilities of much larger ships.

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AN OVERVIEW OF THE ROLE OF THE NAVSEA HUMAN-FACTORS engineering program IN SHIP DESIGN

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NAVAL ENGINEERS JOURNAL 1983年第4期95卷 139-152页

作者： STEIN, NI BENEL, RA MALONE, TB Mr. Norman I. Stein:received his degree in mechanical engineering from the University of Iowa in 1943. MK Stein began his career with the Bureau of Ships Department of the Navy. After his military service with the Army of Occupation in Japan he has held positions with the Corps of Engineering Atomic Energy Commission Walter Reed Army General Hospital and the Protective Structures Development Center Department of the Army. He returned to the Naval Sea Systems Command in 1967 and is currently with the Manning and Controls Integration Branch SEA 55 W16. Mr. Stein is a registered professional engineer in New York state and also is a certified fallout shelter analyst with the Department of the Army. He has authored a comprehensive study on air distribution studies in multi-room shelters presentedpapers on human factors engineering to the Association of Scientists and Engineers and recently contributed a chapter on human factors engineering which will be incorporated in the proposed Naval Sea Systems Handbook on Surface Ship Design. Russell A. Benel:received his Ph. D. in engineering psychology from the University of Illinois at Urbana-Champaign. He is currently a Senior Research Scientist with Essex Corporation where he is the manager of the Man-Machine Systems Department. He has been responsible f o r scientific studies associated with the Human Factors Engineering f o r ships program under contract to the Naval Sea Systems Command specifically the development application and validation of human factors engineering technology f o r surface ship systems such as aircraft launch and recovery propulsion engineering combat direction weapons and total ship systems. He is currently providing Human Factors Engineering Support on the DDG-51. His other activities include a variety of research development test and evaluation activities for military systems. He had been with the Crew Performance Branch of the Crew Technology Division at the USAF School of Aerospace Medicine as a National Research Council Postd

This paper provides a context within which the role of human factors engineering (HFE) for Naval ship design may be understood. HFE is defined and its history as part of engineering design teams is traced. The role of HFE in ship systems design is defined, and the HFE Technology for Ships program, managed by SEA 061R, is described. The rationale for inclusion of HFE in the design process is presented, the methodology whereby it is incorporated into the design process is detailed, methodology to assess the application of HFE is outlined, and the benefits that will accrue as a result of inclusion of HFE considerations in the design process are documented. The counterpoint to inclusion is illustrated through instances of design-induced human errors. A specific application of HFE in the acquisition process is illustrated through use of the Landing Craft, Air Cushion HFE program plan. The difficulties which may be encountered as the size of the target system expands are described. Potential roadblocks to the required incorporation of HFE are examined for their source and possible ameliorative steps.

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BLUE-GREEN LASERS FOR SUBMARINE COMMUNICATIONS

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NAVAL ENGINEERS JOURNAL 1983年第3期95卷 173-177页

作者： WRIGHT, WE LCDR. WILLIAM E. WRIGHT USN:is an Engineering Duty Officer with surface warfare experience. He served in the Weapons and Combat Systems departments of USS Harwood (DD-861)USS William V. Pratt (DDG-44) andUSS Henry B. Wilson (DDG-7). He received a Ph.D. in physics from the California Institute of Technology in 1973 as an NSF Fellow under the NavyScholarship Program and was later assigned as a Military Research Associate at Lawrence Livermore National Laboratory. In his current assignment at the Defense Advanced Research Projects Agency he is the program manager for Submarine Laser Communications and the founding director of the Joint Space Nuclear Power Technology Office at NASA.

Blue-green light has long been known to penetrate sea water to substantial depths. Moreover, the same light will propagate through clouds in a fairly predictable fashion. With narrow-band laser light signals in the blue-green and appropriately matched optical filters to block sunlight and other interfering light sources we should be able to communicate from space or aircraft to submerged objects. Three questions then arise: First, what are the characteristics of this communication channel and how do clouds, water turbidity, and their global statistics affect our ability to communicate? Second, in N avy use of any new technology there is a complex interplay between technical features and limits, employment strategies and tactics, and the value of a new technology system to N avy mission performance. How might a Submarine Laser Communications capability be useful to the N avy and what are the unique features of such a capability? Finally, what are the technical and engineering obstacles to exploiting this capability and how might it be transformed from a scientist's dream to a fleet reality? This paper examines each of these questions from the viewpoint of directing technology and engineering development. The tentative conclusion is that as the technology matures, the uniquely useful and affordable capabilities may become available to the N avy .

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PUTTING AN OIL-SPILL CLEANUP COMPUTER-MODEL TO WORK FOR THE NAVY

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NAVAL ENGINEERS JOURNAL 1983年第3期95卷 165-172页

作者： NYHART, JD PSARAFTIS, HN YAROSCHAK, PJ Mr. J. D. Nyhart:is professor of management at the Sloan School of Management and the Department of Ocean Engineering at the Massachusetts Institute of Technology. His current research and writing focus on the use of scientific and technical material in formal judicial and administrative proceedings as well as the development of economic and regulatory models appropriate for deep ocean mining and oil-spill control. Harilaos N. Psaraftis:is Assistant Professor of Marine Systems at the Department of Ocean Engineering at the Operations Research Center at M.I.T. Professor Psaraftis received two M.Sc. degrees in 1977 (in Naval Architecture and Marine Engineering and in Shipping and Shipbuilding Management) and a Ph.D. in 1979 (in Ocean Systems Operations Research) all from M.I.T. Professor Psaraftis has been conducting research in problem areas such as the probabilistic modeling of underwater detection and optimal sensor allocation (project sponsored by ONR) the optimization of oil spill cleanup operations (project sponsored by a consortium of government and industry organizations) the development of routing and scheduling algorithms in transportation problems (project sponsored by DOT) and the analysis and solution algorithms of sealift routing and scheduling problems (project sponsored by ONR and the Military Sealift Command). Professor Psaraftis has published in various journals and is currently the Chairman of the Ocean Systems Management Program at M.I.T. Mr. Paul J. Yaroschak:received his Bachelors Degree in Civil Engineering from Villanova University and his Masters Degree in Environmental Engineering from Northeastern University. He has served in the Civil Engineer Corps U.S. Navy in Public Works and Construction Management and as a Project Engineer for Navy-wide Water and Wastewater Treatment Projects for the Naval Facilities Engineering Command. He is currently Head of the Environmental Engineering Branch of the Naval Facilities Engineering Command. Mr. Yaroschak is a Registered Professional Engineer i

A research group at the Massachusetts Institute of Technology has completed the first phase of the development of a computer assisted model for analyzing complex decisions and policies regarding oil spill cleanup. The model is the product of an ongoing MIT Sea Grant project, sponsored by a consortium of government and industry organizations, including the National Oceanic and Atmospheric Administration, the U.S. C oast G uard , the U.S. N avy , the Commonwealth of Massachusetts, the Spill Control Association of America, JFB Scientific Corporation, the Doherty Foundation, Petro-Canada and Texaco. The model can be used, among other things, in strategic planning for the long-term oil spill response needs of a region, in assisting On Scene Coordinators in responding to a specific spill (tactical/operational setting), in evaluating the environmental and economic damages of a spill versus the cost of cleanup, in simulation and training, and in the analysis of various policy and regulatory issues such as the effects of delays, the use of dispersants and the investigation of liability and compensation issues. The paper describes the model in detail, focuses on its potential uses and presents experience with its application in conjunction with pollution control efforts of the U.S. Navy. Specifically, we outline the application of the model in the Port of Charleston, South Carolina, an ongoing project sponsored by the Naval Facilities engineering Command. The difficulty of gathering data for such an application is discussed.

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Book reviews

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Water, Air, and Soil Pollution 1983年第3期20卷 347-359页

作者： A. Price Emilio Astolfi S. M. Siegel B. Z. Siegel Brian Lamb D. E. Elrick Frank L. Tábrah Stanley Batkin Eduard H. Adema Elmer Robinson Michel Bernarie G. F. Humphrey S. N. Linzon Clarence Golueke Commission of the European Communities Brussels Belgium Ecotoxicology Dept. School of Medicine Buenos Aires Argentina Department of Botany Pacific Biomedical Research Center USA University of Hawaii Honolulu USA Air Pollution Research Section Department of Chemical Engineering Washington State University Pullman USA Department of Land Resource Science University of Guelph Guelph Ontario Canada University of Hawaii at Manoa Cancer Center of Hawaii Basic Science Program Honolulu USA Department of Air Pollution Agricultural University EV Wageningen The Netherlands Washington State University Pulman USA Bréigny-sur-Orge France Sydney University CSIRO Australia Supervisor Phytotoxicology Section Air Resources Branch Ontario Ministry of the Environment Toronto Ontario Canada Cal Recovery Systems Richmond USA

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A TIME FOR SHIPBUILDING RENAISSANCE

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NAVAL ENGINEERS JOURNAL 1983年第5期95卷 33-63页

作者： RAMSAY, R is the Director of the Office of Maritime Affairs and Shipbuilding Technology Naval Sea Systems Command (NA VSEA 90M) a position he has held since June 1981. Mr. Ramsay was trained as a Naval architect in England (1947–1952) with Furness Shipbuilding Company and served with the British Army. He also holds an MSc Administration (Management Engineering) degree from George Washington University. In 1956 he was employed as a naval architect with Davie Shipbuilding Company P. Quebec. Upon entry to the United States (1958) he served as a naval architect with the Great Lakes Engineering Works Detroit a company engaged in the design and construction of Great Lakes supercarriers. When the company was disbanded (1959) Mr. Ramsay became a member of the Chrysler Corporation engineering management staff where his responsibilities included long-range planning and oversight of the total vehicle design. When granted citizenship (1962) Mr. Ramsay elected to enter the naval ship design field and was employed by General Dynamics/Electric Boat Division (1963–1967) where he held various lead naval architect positions on projects for submarines submersibles the Fast Deployment Ship (FDLS) Surface Effect Ship (SES) and a high-speed containership. Mr. Ramsay commenced government service (1967) with the Naval Ship Engineering Center in the Ship Concept Design Division and he also served with the Naval Sea Systems Command Submarine Logistics Division (SEA 921) as Program Management PERA (SS) and Project Manager SSN 637 Class Submarines. In 1975 he transferred to the Auxiliary and Special Mission Ship Acquisition Project (PMS 383) to gain ship acquisition experience with the ASR 21 Class and the T-ARC 7. Prior to selection for his present position Mr. Ramsay was assigned to the Department of Commerce National Oceanic and Atmospheric Agency (NOAA) Office of Ocean Engineering as Technical Manager for the Development of an Oceanlab research submarine. Other duties were permformed as a Science Systems Analyst responsible fo

This paper provides an overview of the U.S. shipbuilding and repair industry vitality, and its past and present capability to support new ship construction programs in the national interest. The capabilities of the shipbuilding industrial base are also examined at the primary, secondary, and tertiary levels of supplier support in relation to an expanded naval shipbuilding program. The aspects of technological improvements and the humane use of human beings, in the ship production process, are discussed with particular reference to the workforce management practices in foreign countries. An optimistic conclusion provides a prognosis regarding the prosecution of expanded naval shipbuilding programs within the capacity and capability of the U.S. industry.

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THE APPLICATION OF A PLANNING CONTRACT CONCEPT TO A complex NAVY SURFACE SHIP OVERHAUL

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NAVAL ENGINEERS JOURNAL 1983年第2期95卷 51-65页

作者： NODELL, WR SIAS, PM William R. Nodell USCG (Ret.):graduated from the U. S. COAST GUARD Academy in 1950 receiving a B.S. degree and earned his Master of Sciences and Naval Engineer degrees from the Massachusetts Institute of Technology in 1957. He has served in various line and engineering capacities on board COAST GUARD Cutters in Atlantic Pacific and Alaskan waters. He served in the production department of the COAST GUARD Yard in Curtis Bay Maryland and later was Chief of the Naval Engineering Branches of the 13th COAST GUARD District in Seattle Washington and the 3rd COAST GUARD District New York New York. After retirement he held a position as Manager of the Marine Engineering Department at Atlantic Research Corporation Costa Mesa California and joined Lockheed Shipbuilding and Construction Company in 1973. He was Project Engineer for the Polar Class Icebreakers the AS-41 and the LSD-41 in various stages. He has contributed technical papers to several professional societies. He is currently a member of the Society of Naval Architects and Marine Engineers the American Society of Naval Engineers where he served as a past chairman of the Puget Sound Chapter and the National Management Association where he served as a Past President of the local chapter. He is a senior systems engineer at Lockheed. Peter M. Sias:received his B.S. degree in Marine Engineering from Maine Maritime Academy in 1950. Subsequently he completed a NAVY sponsored program in Naval Architecture at the University of California and Department of Defense courses in program management and contract administration at the Air Force Institute of Technology. He served on active duty with the United States Navy during the Korean emergency with assignments as Engineering Officer for a minesweeper and collateral staff duty assignments with the Commander Mineforce U.S. Pacific Fleet for reserve ship activation. Upon release from active duty in 1952 he joined United States Steel Corporation as an Industrial Engineer. In 1955 he accepted a position in the Eng

Early in 1979, the Commander in Chief, United States Pacific Fleet requested that alternate procedures be explored for overhaul of the USS Sacramento (AOE-1). Of particular concern was the availability of the ship to accomplish alterations and repair planning prior to the start of the overhaul and the history of AOE Class ships not being completed in the private sector within the scheduled availability time. The planning type contract concept wherein pre-overhaul tests and inspections, preparation of drawings, procurement of long lead time material and detailed overhauling planning and scheduling would be accomplished by the successful Contractor was one approach requested for major consideration. In July 1979, the decision was made to proceed with the planning contract concept for overhaul of the USS Sacramento. The Request for Proposals (RFP's) were issued to industry in November 1979 with contract award to Lockheed Ship building and Construction Company (LSCC) on 4 February 1980. In September 1980, the overhaul for USS Sacramento was classified by the Navy as “complex”, confirming specific management action and attention to be given during the planning and overhaul phases. This technical paper describes the application of the planning contract concept to the planning and overhaul of USS Sacramento. Actual experiences including issue of the negotiated Request for Proposals (RFP's), performing pre-overhaul test and inspections (POT & I) procedures, accomplishing ship check and drawing preparation, and scheduling, including proper phasing of all elements and critical path analysis, will be reviewed in detail. Comparisons to conventional procedures will be made, along with concepts for modifying the methods employed to custom fit the characteristics of future overhauls. The closure will include a summary of “lessons learned” to date with specific recommendations for application of procedures to future overhauls.

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THE STRUCTURAL SYNTHESIS DESIGN program - ITS IMPACT ON THE FLEET

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NAVAL ENGINEERS JOURNAL 1983年第3期95卷 87-99页

作者： WIERNICKI, CJ GOODING, TG NAPPI, NS Mr. Christopher J. Wiernicki:graduated from Vanderbilt University in 1980 with a B.E. degree in Structural Engineering. Upon graduation he began his professional career at the David Taylor Naval Ship Research and Development Center. As a structural engineer in the Surface Ship Structures Division Mr. Wiernicki was responsible for developing improved methods and procedures for designing and evaluating structural systems for surf ace combatants. Specific projects included design for producibility development and evaluation of automated ship structural design methods and participation in the structural design of the CG 49 Cruiser and the current DDG 51 Destroyer. In 1982 Mr. Wiernicki received his M.S. degree in Ocean Engineering from George Washington University. Mr. Wiernicki is a recipient of the SNAME 1982-82 Graduate Scholarship and is currently doing post graduate work in Naval Architecture at Massachusetts Institute of Technology he is a member of ASNE SNAME ASCE and Chi Epsilon. Mr. Thomas G. Gooding:graduated in 1975 from the University of Michigan with B.S. degrees in Oceanography and Naval Architecture. After graduation he began his professional career at the Naval Ship Engineering Center (NA VSEC) as a structural engineer. From 1975 till 1978 Mr. Gooding worked in the area of ship dry docking and was the structural task leader on the complex overhaul ofUSS Long Beach (CGN-9). Mr. Gooding returned to the University of Michigan to receive a M.S. in Naval Architecture in 1979. Currently Mr. Gooding is the structural task leader on the DDGX/DDG 51 program at the Naval Sea Systems Command (NAVSEA). Mr. Gooding is a member of SNAME and the Naval Institute. Mr. Natale S. Nappi:graduated from City College of New York in 1954 with a Bachelor of Civil Engineering and received his M.S. in Civil Engineering from Polytechnic Institute of Brooklyn in 1959. He began his professional career in 1964 at the New York Naval Shipyard as a Naval Architect (Structure) performing detail structural design and fabrication s

The structural design of a ship's section is a complicated, repetitive and time consuming task. With the advent of new technology, high speed computers have enabled the ship designer to accomplish in a matter of seconds what would formerly take days to accomplish by hand. The Structural Synthesis Design program (SSDP) is a N avy developed computer-aided design tool which is used to design (or to analyze) the longitudinal scantlings for a variety of ship cross sections, consisting of any practical combinations of decks, platforms, bulkheads and materials, i.e., various steel and aluminum alloys. The final hull section design will have the lowest practical weight for the chosen geometric configuration, structural arrangements, and imposed loadings. The scantling developed by the program will satisfy all U.S. N avy ship structural design criteria. An explanation of the objective and design elements of N avy ship structures is included. The rationale behind the SSDP design philosophy is developed along with the significant program capabilities. In an attempt to highlight the influence of automated design procedures on the current naval ship design process, the effect of the SSDP on the DDG 51 destroyer structural development is addressed.

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THE SYSTEM engineering ANALYSIS - A STRUCTURED APPROACH FOR IMPROVING SHIP MAINTENANCE

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NAVAL ENGINEERS JOURNAL 1982年第2期94卷 118-126页

作者： BEYERS, CP The authoris a member of the technical staff in the Ships Systems Program of ARINC Research Corporation's Ships and Ordnance Division. He is currently applying the System Engineering Analysis (SEA) methodology to systems installed on auxiliary class ships. He is the coauthor ofAmphibious Ship Engineering Operating Cycle (PEOC) Program Engineering Analysis Requirements which documents the SEA methodology. He has been instrumental in the development and improvement of the procedures and analytical techniques for the SEA methodology and the application of those procedures and techniques in the analyses of various ship systems and equipments. He has applied the SEA methodology to propulsion plant systems and equipments auxiliary systems and equipments and some electronic systems and equipments for the FF 1052 DDG 37 CG 16 CG 26 DD 963 AOE 1 AFS 1 and AOR 1 Classes. Prior to joining ARINC Research Mr. Beyers was responsible for test program development and data analysis for wind tunnel temperature testing of cars at Chrysler Corporation. He also solved mechanical and production problems with shock absorbers affecting car ride shock absorber life and parts costs. Mr. Beyers received his BS in Engineering from Oakland University (Rochester Michigan) in 1972.

This paper describes the System engineering Analysis (SEA), a methodology developed to objectively define and improve ship maintenance using Navy historical maintenance data. The methodology is based on the analysis of recurring failures and maintenance actions as exhibited in the maintenance data and the use of reliability-centered maintenance concepts for defining maintenance requirements. Failure modes and effects analyses (FMEAs) are limited to historically recurring failures; FMEAs are not conducted for all possible failure modes because of the likelihood of limited payback coupled with increased analysis cost. Results of a SEA provide (1) information for the Class Maintenance Plan, which defines the intermediate and depot-level maintenance requirements for a ship class, and (2) supporting information for the design review process and for improvements in the integrated logistics support of the selected system or equipment. The SEA also recommends design studies, design improvements, and maintenance strategy and support improvements.

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SEALIFT CAPABILITIES AND SEA SHED

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NAVAL ENGINEERS JOURNAL 1982年第2期94卷 61-67页

作者： ROCHE, JJ CORKREY, R BENEN, L Mr. John Roche:graduated from the State University of New York Maritime College with a bachelors degree in marine engineering and received an M.B.A. from the Wharton School. He worked as a Designer in the Engineering Technical Department of Newport News Shipbuilding and Drydock Co. and he sailed with a number of U.S. flag companies as an Engineering Officer. He joined the Maritime Administration in 1967 and is currently the Assistant for Program Development and Control in the Office of Research and Development. He is a member of ASNE and SNAME. Mr. Ron Corkrey:received B.B.A and M.B.A degrees from the Golden Gate University and was later a guest lecturer there and at other universities. From 1955 to 1969 he held various positions with the Matson Navigation Company ranging from Systems Analyst to Pier Superintendent. From 1969 to 1971 he was the Northern California District Manager for Signal Trucking Service Ltd. He joined the Maritime Administration in 1971 as a Transportation Specialist in the Western Region Office and he is now in Washington D. C. as Program Manager for Cargo Systems R&D. He is a member of the SNAME D31 (Cargo Handling) Panel. Mr. Larry Benen:received his B.S. degree from the U.S. Merchant Marine Academy and a M.S. degree from George Washington University. He is a graduate of the Industrial College of the Armed Forces (ICAF). He has been employed as a research program manager for the Naval Sea Systems Command since 1967 in the areas of Hydromotions and Logistics. He is presently the Program Manager for the Merchant Ship Naval Augmentation Program Exploratory Logistics Experimental Ships and Strategic Sealift Procurement Program.

Projecting our power to far corners of the earth depends on a strategic mobility triad composed of: airlift, prepositioned equipment, and sealift. Airlift can move personnel effectively and limited supplies quickly over great distances. Prepositioned equipment and supplies can extend the effectiveness of those personnel if the circumstances are right, and if we have chosen our positioning sites well. Sealift will provision the lion's share of any protracted engagement, and the ships of the Merchant Marine are a key element in our sealift resources. This paper describes various ways that the Merchant Fleet is being made more responsive to its possible role as a naval auxiliary, and it describes a new concept called SEA SHED which can quickly expand the versatility of Containerships. Containerships have revolutionized marine transportation and they now represent a large and growing portion of the Commercial Fleet. They are limited in the types of cargo they can carry, however, excluding much of the larger equipment required by military units. SEA SHED is a cargo module which fits into the cell guides of a Containership and effectively converts it to a 'tween deck, break-bulk ship which can carry almost all military equipment.

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