1,720,965 research outputs found
ASNET – A simulation framework to support the early stage design of naval ships
No full textDesigning warships to operate effectively and affordably within a system-of-systems perspective is a complex task. It requires timely insight into: 1. How requirements and technical solutions influence operation effectiveness and costs at the single ship level. 2. A broader view of how individual system performance parameters, environment, and tactics in a system-of-systems context, influence the overall effectiveness and affordability of a whole fleet of naval platforms in larger operations. The capability to increase and deepen understanding of the relationship between requirements, mission effectiveness and ship size and cost could have a profound impact on how future naval ships will be developed. The potential benefits could also include a reduction in total ship development time and cost. CETENA is defining and developing a collaborative multi-disciplinary software environment capable of fully supporting the preliminary design phases of a military ship. This paper aims at underlining the Italian innovative approach, named ASNET. NOMENCLATURE DSD Design Support Dashboard DSM Design Synthesis Model ESSD Early Stage Ship Design LCC Life Cycle Cost Methods OEM Operational Evaluation Model
Unified Trade-Off Environment: A Listening To Experts Opinion In The Preliminary Warship Design
No full textThe concept phase of the naval ship design process is traditionally based on experience, balanced application of project constraints, prescriptive rules and experimental information. In the so-called early-stage design it’s advisable a close interaction between client (usually MoDs), designers and experts of naval weapon systems and equipment C4I (Command, Control, Communications, Computers, and Intelligence). The goal of this project is to develop a tool for a multi-dimensional evaluation of the operational effectiveness of a combatant ship. It is based on experts knowledge elicitation in order to specify, in a structured way, the level of significance of different solutions and possible configurations characterizing a naval unit with respect to the operational scenarios of interest. In this perspective, in the present paper the tool for knowledge elicitation will be described and discussed with specific attention to the ship technical characteristics able to describe consistently the naval unit under investigation in terms of operational capabilities, through the use of systems functional decomposition. A methodology and a tool will be therefore identified with the aim to rationally link the main ship design characteristics to operational effectiveness through systems functions
Optimization of drugs delivery routes through location routing problem (Lrp): A case study
No full textThe location-routing problem (LRP) plays a critical role in logistics system optimization where companies need to set up a proper design of operation strategies to fulfil the demand for product delivery. This paper analysed an efficient products distribution of a delivery drugs Italian company through the development of LRP analysis. Thus, due to a reduction of company sales volume, a delivery routes re-planning was investigated moving from a logistics plan that involved the use of the main warehouse with replenishment at intermediate one to a new configuration with only the main warehouse. The analysis is based on the identification of the ideal location of the main warehouse by optimizing the delivery routes of goods to meet customers’ demands. Optimal solutions are found according to the integration of the facility location and the vehicle-routing problems (VRP) aimed at minimizing the total logistic system cost
System Modeling and Performance Assessment for Naval ships Design: an Application for an Offshore Patrol Vessel
No full textIn the proposed paper, a Ship Synthesis Model (SSM) code is presented. It basically consists of a sequence of logically-integrated parametric formulations provided by a statistical analysis derived from existing ships. The code is integrated into a wider numerical architecture, developed by Orizzonte Sistemi
Navali S.p.A. and called ASNET (Application System for Naval ship design Evaluation and Testing), which also includes an Operational Evaluation Model (OEM) aiming at evaluating the measure of effectiveness of a certain ship design when different naval tasks have to be complied with. This way, ship design characteristics are linked to operational aspects.
A test case concerning an Offshore Patrol Vessel (OPV) is reported as well, in order to assess the capability of
the SSM code to evaluate the feasibility of different design configurations, obtained considering different ship
requirements
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The Application of a Ship Synthesis Model (SSM) for the Trade-off Study of Offshore Patrol Vessel
No full textIn the naval ship design and acquisition process, especially at an early stage, is increasingly crucial the application of computational tools, able to tackle the main ship characteristics and their interactions for the assessment of different design solutions in a reasonable time. The most comprehensive use of such computational tools is, undeniably, the possible interface with a cost estimating module and a performance evaluator with the aim to better lead the concept exploration process.
The Ship Synthesis Model (SSM) can be an useful computational tools/approach in this exploration process: it allows to select a subset of feasible ship configurations which satisfy the settled requirement, evidencing the balancing of different functions, often affected by conflicting constraints.
In fact, beside design requirements (speed, endurance, crew members, payload...), it permits to identify several design parameters (L,B, form coefficients, propulsion and diesel enerator plants,...), together with their functional relations and functional constraints. Then different balances in terms of propulsion and electric power, weights, volumes and areas are worked out.
In the proposed paper an SSM code is presented together with an application case, in terms of trade off analysis for an offshore patrol vessel design. The sensitivity analysis of the SSM tool has been performed in relation with different ship requirements
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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