Comparison of a Simplified Vessel Response Estimation With a State of the Art Vessel Response Prediction Computer Tool

2017 ◽  
Author(s):  
Jens B. Ildstad ◽  
Thomas M. Kolstad ◽  
Karl H. Halse
Keyword(s):  
Design Process ◽  
State Of The Art ◽  
Early Stage ◽  
Main Idea ◽  
Response Prediction ◽  
Hydrodynamic Characteristics ◽  
Detail Design ◽  
Simplified Method ◽  
Vessel Response ◽  
Definition Of

Within ship design it is of great importance to predict the vessels movement while at sea so the designer can ensure safety and comfort of passengers and crew. In early stages of the design process, where main dimensions are not yet set, it is useful to have a qualified estimate of what the vessel behavior will be. In 2004 Jensen et.al proposed a series of closed form expressions to calculate the wave induced motions for a monohull ship. Jensen’s formulas were based on a semi analytical approach and the input data is restricted to main dimensions together with forward speed and heading. The main idea behind a simplified vessel response estimate is to be able to make qualified evaluations of a vessel’s hydrodynamic characteristics at an early stage in the design process. Recently, several applications have been developed based on Jensen’s method. An independent comparison of the method was therefore sought after, in order to increase the understanding of the accuracy level of the simplified method. In this paper we compare the ship motion estimated with Jensen’s simplified method with the vessel prediction from a state-of-the-art linear hydrodynamic vessel prediction module in ShipX. J.J. Jensen’s simplified method delivers significant differences in response amplitude and resonance range. While more general trends seem to be well captured. The differences originate mainly from Jensen’s assumptions about constant added mass, the definition of the damping coefficient and that the ship is considered box-shaped. These differences give that the simplified method is not suitable as a tool for detail design of ships, but more suitable as support during concept development of ship designs.

DSM-Based Product Representation for Design Process Modularity

2008 ◽  
Author(s):  
Xiaoxia Lai ◽  
John K. Gershenson
Keyword(s):  
Product Design ◽  
Design Process ◽  
Modular Design ◽  
Early Stage ◽  
Modular Architecture ◽  
Product Representation ◽  
Stage Design ◽  
Design Efficiency ◽  
Product Modularity ◽  
Definition Of

An appropriate modularity representation is of critical importance in modular design. Without an appropriate representation, modular design cannot realize its benefits. In this paper, a representation for DSM-based modular product design is developed that facilitates product modularization with respect to the design process. The representation is based upon previous work presented in this venue that details representations for the assembly and manufacturing processes (Lai and Gershenson, 2007a; Lai and Gershenson, 2007b). The representation for the design process includes a design process similarity matrix and a design process dependency matrix. The definition of design process similarity uses information available in early stage design and is based on the similarity of the design tools and resources required for later stage design. Design process similarity within a module leads to increased design efficiency from the sharing of functional and geometric analyses and possibly the savings of not needing to “un-immerse” from a particular design task to “re-immerse” in the design of the next component. The definition of design process dependency is based on the connectivity caused by components’ design process attributes with the goal of fewer design interactions between different modules. With zero dependencies between modules, we hope to contain the cascade of design changes within each module, and prevent the need to redesign other modules. In this paper, we first present which design process elements we should consider for defining design process similarity and dependency, and then construct respective similarity and dependency factors tables. These tables include similarity and dependency factors, which, along with their values, are important in determining a product’s modular architecture at the early stages of design. Finally, a computer mouse is used to illustrate how to apply these factors tables to generate the similarity and dependency matrices that represent product modularity for the product design process. Using these representations as input to the DSM-based modular design methods, we can achieve a design with a modular architecture that improves design efficiency in the later stages of design. In the future, we hope to extend and generalize the process for developing product modularity representations so that it is applicable across all life-cycle processes.

scholarly journals User involvement in building design – a state-of-the-art review

2019 ◽  
Vol 26 (48) ◽  
pp. e151752
Author(s):  
Michele Caroline Bueno Ferrari Caixeta ◽  
Patrícia Tzortzopoulos ◽  
Márcio Minto Fabricio
Keyword(s):  
Literature Review ◽  
Design Process ◽  
Systematic Literature Review ◽  
Architectural Design ◽  
State Of The Art ◽  
User Involvement ◽  
Building Design ◽  
Clear Definition ◽  
Definition Of

This paper reports results of a systematic literature review on the definitions and levels of user involvement in the design process. Although many studies have highlighted the importance of user involvement for the quality of both process and final product, the term still lacks a clear definition and different models describe diverse involvement levels, which are detrimental to the advancement of knowledge in the area. The present study focused on the mapping of definitions of user involvement and comparisons of the different proposals of involvement levels for outlining a clear definition of the term, based on the levels of involvement, and contributing to the consolidation of the theory of user involvement in the field of architectural design.  Moreover, this research assists architects to find the most appropriate level of user involvement for the design they are developing, improving the practice of involving users in the design process.

scholarly journals Development and Validation of a Roadmap to Assist the Performance-Based Early-Stage Design Process of Adaptive Opaque Facades

2020 ◽  
Vol 12 (23) ◽  
pp. 10118
Author(s):  
Miren Juaristi ◽  
Thaleia Konstantinou ◽  
Tomás Gómez-Acebo ◽  
Aurora Monge-Barrio
Keyword(s):  
Design Process ◽  
Thermal Performance ◽  
Early Stage ◽  
Methodological Approach ◽  
Low Carbon ◽  
Stage Design ◽  
Technology Applications ◽  
Early Stage Design ◽  
Definition Of ◽  
Low Carbon Energy

Adaptive Opaque Facades (AOF) is an innovative concept with potential to achieve low carbon energy buildings. However, so far AOF are not integrated in the construction industry. One remarkable issue that designers have when dealing with alternative low-carbon technologies, such as AOF, is the absence of previous built experiences and the lack of specialised technical knowledge. Design roadmaps can be convenient solutions to guide pioneer low carbon technology applications. This work presents a roadmap to assist the performance-based early-stage design process of Adaptive Opaque Facades. Previous research developed new approaches and tools to assist on the construction definition of AOF, so that their adaptive thermal performance was considered when specific design decisions needed to be made. The roadmap presented in this paper organises the implementation sequence of each methodological approach and tools in different design stages, which aims to provide a holistic design approach for AOF. The usability of the roadmap was validated in a workshop called “Performance-based Design and Assessment of Adaptive Facades” with master students representing the target group of this roadmap. Even though these students had never heard about AOF before, they could successfully design, define the early-stage characteristics of an AOF and quantify the thermal performance of their AOF designs. The roadmap was proven to be a useful support, which might make the implementation of AOF more approachable in the future.

Queer-Sensible Designing

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Silas DENZ ◽  
Wouter EGGINK
Keyword(s):  
Queer Theory ◽  
Design Process ◽  
Industrial Design ◽  
Gender Norms ◽  
Design Practice ◽  
Gender Scripts ◽  
Femininity And Masculinity ◽  
Design Workshop ◽  
Definition Of ◽  
Design Style

Conventional design practices regard gender as a given precondition defined by femininity and masculinity. To shift these strategies to include non-heteronormative or queer users, queer theory served as a source of inspiration as well as user sensitive design techniques. As a result, a co-design workshop was developed and executed. Participants supported claims that gender scripts in designed artefacts uphold gender norms. The practice did not specify a definition of a queer design style. However, the co-design practice opened up the design process to non-normative gender scripts by unmasking binary gender dichotomies in industrial design.

scholarly journals Improved design criterion for frictionally engaged contacts in overrunning clutches

2021 ◽  
Author(s):  
Nadine Nagler ◽  
Armin Lohrengel
Keyword(s):  
Design Process ◽  
Contact Area ◽  
Axial Load ◽  
State Of The Art ◽  
Tangential Force ◽  
Design Criterion ◽  
Hertzian Contact ◽  
Loss Of Function ◽  
Axial Loads ◽  
Improved Design

AbstractOverrunning clutches, also known as freewheel clutches, are frictionally engaged, directional clutches; they transmit torque depending on the Freewheel clutch rings’ rotation directions. The torque causes a tangential force in the Hertzian contact area. The hitherto “state-of-the-art design criterion” bases on this load situation. In practice, axial loads additionally act on the frictionally engaged Hertzian contact area. This additional axial load can cause the loss of the friction connection and so the freewheel clutch slips. This publication presents an improved design criterion for frictionally engaged contacts in freewheel clutches. It allows to consider tangential as well as axial loads during the design process. Additionally, it offers the possibility to estimate the probability of frictional engagement loss and gross slip based on the freewheel clutch’s application scenario. This publication points out how to use the improved design criterion to design freewheel clutches that are more robust against a loss of function.

scholarly journals REVIEW OF DESIGN HEURISTICS AND DESIGN PRINCIPLES IN DESIGN FOR ADDITIVE MANUFACTURING

2021 ◽  
Vol 1 ◽  
pp. 2571-2580
Author(s):  
Filip Valjak ◽  
Angelica Lindwall
Keyword(s):  
Additive Manufacturing ◽  
Design Process ◽  
Research Question ◽  
Design Principles ◽  
Current Status ◽  
Design For Additive Manufacturing ◽  
Design Heuristics ◽  
Similarities And Differences ◽  
Definition Of ◽  
Support Methods

AbstractThe advent of additive manufacturing (AM) in recent years have had a significant impact on the design process. Because of new manufacturing technology, a new area of research emerged – Design for Additive Manufacturing (DfAM) with newly developed design support methods and tools. This paper looks into the current status of the field regarding the conceptual design of AM products, with the focus on how literature sources treat design heuristics and design principles in the context of DfAM. To answer the research question, a systematic literature review was conducted. The results are analysed, compared and discussed on three main points: the definition of the design heuristics and the design principles, level of support they provide, as well as where and how they are used inside the design process. The paper highlights the similarities and differences between design heuristics and design principles in the context of DfAM.

Systematic Literature Review on Smart Mobility: A Framework for Future “Quantitative” Developments

2021 ◽  
pp. 088541222199424
Author(s):  
Mauro Francini ◽  
Lucia Chieffallo ◽  
Annunziata Palermo ◽  
Maria Francesca Viapiana
Keyword(s):  
Cluster Analysis ◽  
Literature Review ◽  
Systematic Literature Review ◽  
Performance Indicators ◽  
State Of The Art ◽  
Measurement Model ◽  
Broader Impacts ◽  
Research Goal ◽  
Smart Mobility ◽  
Definition Of

This work aims to reorganize theoretical and empirical research on smart mobility through the systematic literature review approach. The research goal is to reach an extended and shared definition of smart mobility using the cluster analysis. The article provides a summary of the state of the art that can have broader impacts in determining new angles for approaching research. In particular, the results will be a reference for future quantitative developments for the authors who are working on the construction of a territorial measurement model of the smartness degree, helping them in identifying performance indicators consistent with the definition proposed.

scholarly journals New polyp image classification technique using transfer learning of network-in-network structure in endoscopic images

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Young Jae Kim ◽  
Jang Pyo Bae ◽  
Jun-Won Chung ◽  
Dong Kyun Park ◽  
Kwang Gi Kim ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Transfer Learning ◽  
Test Data ◽  
State Of The Art ◽  
Early Stage ◽  
Statistical Significance ◽  
Recall Rate ◽  
Training Data ◽  
Fine Tuning ◽  
Accuracy Evaluation

AbstractWhile colorectal cancer is known to occur in the gastrointestinal tract. It is the third most common form of cancer of 27 major types of cancer in South Korea and worldwide. Colorectal polyps are known to increase the potential of developing colorectal cancer. Detected polyps need to be resected to reduce the risk of developing cancer. This research improved the performance of polyp classification through the fine-tuning of Network-in-Network (NIN) after applying a pre-trained model of the ImageNet database. Random shuffling is performed 20 times on 1000 colonoscopy images. Each set of data are divided into 800 images of training data and 200 images of test data. An accuracy evaluation is performed on 200 images of test data in 20 experiments. Three compared methods were constructed from AlexNet by transferring the weights trained by three different state-of-the-art databases. A normal AlexNet based method without transfer learning was also compared. The accuracy of the proposed method was higher in statistical significance than the accuracy of four other state-of-the-art methods, and showed an 18.9% improvement over the normal AlexNet based method. The area under the curve was approximately 0.930 ± 0.020, and the recall rate was 0.929 ± 0.029. An automatic algorithm can assist endoscopists in identifying polyps that are adenomatous by considering a high recall rate and accuracy. This system can enable the timely resection of polyps at an early stage.

scholarly journals State-of-the-Art Management of Germ Cell Tumors

2018 ◽  
pp. 319-323 ◽  
Author(s):  
Darren R. Feldman
Keyword(s):  
Germ Cell ◽  
State Of The Art ◽  
Early Stage ◽  
Germ Cell Tumors ◽  
High Stakes ◽  
Inappropriate Use ◽  
Common Mistake ◽  
Relative Rarity ◽  
Cure Rates ◽  
Perfect Storm

The state of the art management of germ cell tumors (GCT) in 2018 does not include novel agents targeting genomic alterations or exciting immunologic-based approaches but rather the avoidance of pitfalls in everyday practice. The relative rarity of GCT and high curability with correct management create the "perfect storm" for high-stakes errors to occur. This review focuses on several common pitfalls that should be avoided in staging and management of early-stage and advanced GCT in order to maximize patient outcomes. A particularly frequent misstep is to base treatment decisions on pre- rather than postorchiectomy tumor markers that, depending on marker directionality, can lead to either undertreatment with potentially inferior outcomes or overtreatment with excess toxicity. Another common mistake is the failure to consider the unique ability of GCT to differentiate and the distinct biology of teratoma (chemoresistance and lack of increased glucose uptake compared with normal tissue), which exerts a pervasive influence on nonseminoma management. This may lead to inappropriate use of PET scan to evaluate the postchemotherapy residual mass and, if negative, the conclusion that surgery is not needed whereas (FDG-negative) teratoma should be removed. It could also result in administration of additional unnecessary chemotherapy to patients with marker normalization but without robust radiographic response after 3 to 4 cycles of BEP. Finally, oncologists should strive to maintain standard chemotherapy doses, not substitute carboplatin for cisplatin, and refer to expert centers when expertise (e.g., RPLND) is not available locally in order to achieve optimal cure rates in advanced disease.

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