scholarly journals The Reuse of SysML Behaviour Models for Creating Product Use Cases in Virtual Reality

2019 ◽  
Vol 1 (1) ◽  
pp. 2021-2030
Author(s):  
Atif Mahboob ◽  
Stephan Husung ◽  
Christian Weber ◽  
Andreas Liebal ◽  
Heidi Krömker
Keyword(s):  
Virtual Reality ◽  
Later Life ◽  
Use Cases ◽  
Use Case ◽  
Early Evaluation ◽  
Model Based ◽  
Life Phase ◽  
Behaviour Models ◽  
Definition Of ◽  
Modelling Approach

AbstractAn early evaluation of a product along with the consideration of life phase specific actor(s) and environment(s) can help greatly to gain an understanding of the product's behaviour and interactions. Virtual Reality (VR) can help designers to examine later life situations of a product by means of use case scenarios. However, preparing a VR-scene is still a time-consuming and cumbersome task. A model based approach that uses behaviour models of SysML to describe a VR-scene can reduce the preparation efforts. Such an approach is helpful if it allows the reuse of already described VR-scenes or their contents. This paper talks about the reusability of SysML behaviour models that constitute a VR-scene. This reusability can only be achieved by the generic definition of model interfaces. Therefore, a new modelling approach is presented to facilitate the reuse of SysML behaviour models to form different use cases of a product in VR. This approach also talks about the interface definitions and the management of variants of SysML models. The presented approach is elaborated by an example model that contains variants and uses instances to build different use cases.

An Approach for Building Product Use-Case Scenarios in Different Virtual Reality Systems

2018 ◽  
Author(s):  
Atif Mahboob ◽  
Stephan Husung ◽  
Christian Weber ◽  
Andreas Liebal ◽  
Heidi Krömker
Keyword(s):  
Virtual Reality ◽  
Systems Engineering ◽  
Later Life ◽  
Product Development Process ◽  
New Approach ◽  
Building Product ◽  
Early Evaluation ◽  
Head Mounted Display ◽  
Modeling Approach ◽  
Life Phase

During the product development process, it is of great importance to consider the later life phase situations of a product. This includes the interaction of the product with its environment and the human actor(s) in its different life phases. Therefore, an early evaluation of a product and its later life phase interactions are of great value. Virtual Reality (VR) technology is seen as very important at this point, as it can help the designer to realize the later life phase situations of a product inside VR. However, the preparation of VR-scenes remains a difficult task, as it requires a great amount of time and effort. Furthermore, the current methods for the preparation of such scenes offer very limited reusability. This paper will focus on an existing method that uses Model Based Systems Engineering (MBSE) to describe the VR-scene for a CAVE-type VR-system. This method will be further extended and an improvement to the existing modeling approach will be presented to achieve a faster simulation in VR and reusability of VR-scenes. Furthermore, a detailed comparison of the conventional and the new approach will be presented. The new approach enables a faster simulation that will be validated by comparing the execution speed of both approaches under the modeling approach section. The reusability perspective of the prepared VR-scene will also be discussed. A Head Mounted Display (HMD), in comparison with CAVE type VR-systems, offers a cost reduction in the use of VR technology. This paper will also provide the idea for achieving a simulation in HMD while using the same MBSE-approach used for CAVE type VR-systems. The flow of information for simulation in HMD and the idea of implementation will be presented in detail.

Migrating from ISO/IEC 9126 to SQUARE

2017 ◽  
pp. 160-178
Author(s):  
Paula Estrella ◽  
Nikos Tsourakis
Keyword(s):  
Natural Language ◽  
Potential User ◽  
Use Case ◽  
Relative Importance ◽  
Quality Model ◽  
Evaluation Methodologies ◽  
Model Based ◽  
Fair Comparison ◽  
Definition Of ◽  
Current Standards

When it comes to the evaluation of natural language systems, it is well acknowledged that there is a lack of common evaluation methodologies, making the fair comparison of such systems a difficult task. Many attempts to standardize this process have used a quality model based on the ISO/IEC 9126 standards. The authors have also used these standards for the definition of a weighted quality model for the evaluation of a medical speech translator, showing the relative importance of the system's features depending on the potential user (patient or doctor, developer). More recently, ISO/IEC 9126 has been replaced by a new series of standards, the 25000 or SQuaRE series, indicating that the model should be migrated to the new series in order to maintain compliance adherence to current standards. This chapter demonstrates how to migrate from ISO/IEC 9126 to ISO 25000 by using the authors' previous work as a use case.

scholarly journals Precarity and Aging: A Scoping Review

2019 ◽  
Vol 60 (8) ◽  
pp. e620-e632 ◽  
Author(s):  
Amanda Grenier ◽  
Stephanie Hatzifilalithis ◽  
Debbie Laliberte-Rudman ◽  
Karen Kobayashi ◽  
Patrik Marier ◽  
...  
Keyword(s):  
Phase I ◽  
Phase Ii ◽  
Cultural Context ◽  
Late Life ◽  
Later Life ◽  
Two Phase ◽  
Life Phase ◽  
Conceptual Clarity ◽  
Definition Of ◽  
Design And Methods

Abstract Background and Objective The concept of precarity holds the potential to understand insecurities and risks experienced by older people in the contemporary social, economic, political and cultural context. This study maps existing conceptualizations of precarity in relation to aging and later life, identifies key themes, and considers the use of precarity in two subfields. Research Design and Methods This article presents the findings of a two-phase scoping study of the international literature on precarity in later life. Phase I involved a review of definitions and understandings of precarity and aging. Phase II explored two emerging subthemes of disability and im/migration as related to aging and late life. Results A total of 121 published studies were reviewed across Phase I and Phase II. Findings reveal that the definition of precarity is connected with insecurity, vulnerability, and labor and that particular social locations, trajectories, or conditions may heighten the risk of precarity in late life. Implications and Discussion The article concludes by outlining the need for conceptual clarity, research on the unique multidimensional features of aging and precarity, the delineation of allied concepts and emerging applications, and the importance of linking research results with processes of theory building and the development of policy directives for change.

FORMALIZATION OF TEXTUAL USE CASES BASED ON PETRI NETS

2010 ◽  
Vol 20 (05) ◽  
pp. 695-737 ◽  
Author(s):  
STÉPHANE S. SOMÉ
Keyword(s):  
Petri Nets ◽  
Formal Model ◽  
System Development ◽  
Use Cases ◽  
Use Case ◽  
Design Synthesis ◽  
Restricted Form ◽  
Definition Of ◽  
External Actors ◽  
Execution Semantics

A use case is a specification of interactions involving a system and external actors of that system. The intuitive, user centered nature of textual use cases is one of the reasons for the success of the use case approach. A certain level of formalization is however needed to automate use case based system development, including tasks such as design synthesis, verification and validation. In this paper, a mapping from textual use cases to a formal model (Petri nets) is proposed. Use cases are described in a restricted-form of natural language. The abstract syntax of the language is formally defined using a tuple structure. The mapping from use cases to Petri nets considers use cases sequencing constraints defined at the syntactic-level, and provides a definition of execution semantics to use cases.

scholarly journals Using Actors and Use Cases for Software Size Estimation

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 592
Author(s):  
Radek Silhavy ◽  
Petr Silhavy ◽  
Zdenka Prokopova
Keyword(s):  
Project Planning ◽  
Use Cases ◽  
New Method ◽  
Software Systems ◽  
Software Project ◽  
Use Case ◽  
Size Estimation ◽  
Software Size Estimation ◽  
Use Case Points

Software size estimation represents a complex task, which is based on data analysis or on an algorithmic estimation approach. Software size estimation is a nontrivial task, which is important for software project planning and management. In this paper, a new method called Actors and Use Cases Size Estimation is proposed. The new method is based on the number of actors and use cases only. The method is based on stepwise regression and led to a very significant reduction in errors when estimating the size of software systems compared to Use Case Points-based methods. The proposed method is independent of Use Case Points, which allows the elimination of the effect of the inaccurate determination of Use Case Points components, because such components are not used in the proposed method.

scholarly journals Cardiotoxic effects and myocardial injury: the search for a more precise definition of drug cardiotoxicity

2021 ◽  
Vol 59 (1) ◽  
pp. 51-57
Author(s):  
Daniela Maria Cardinale ◽  
Martina Zaninotto ◽  
Carlo Maria Cipolla ◽  
Claudio Passino ◽  
Mario Plebani ◽  
...  
Keyword(s):  
Early Detection ◽  
Myocardial Injury ◽  
Randomized Clinical Trials ◽  
Imaging Techniques ◽  
Left Ventricular ◽  
Left Ventricular Ejection ◽  
Cardiac Imaging Techniques ◽  
Ventricular Ejection Fraction ◽  
Early Evaluation ◽  
Definition Of

AbstractDrug-induced cardiotoxicity is a major clinical problem; cardiotoxic drugs may induce both cardiac dysfunction and myocardial injury. Several recent studies reported that cardiac troponins measured with high-sensitivity methods (hs-cTn) can enable the early detection of myocardial injury related to chemotherapy or abuse of drugs that are potentially cardiotoxic. Several authors have some concerns about the standard definition of cardiotoxicity, in particular, regarding the early evaluation of chemotherapy cardiotoxicity in cancer patients. Several recent studies using the hs-cTn assay indicate that myocardial injury may precede by some months or years the diagnosis of heart failure (HF) based on the evaluation of left ventricular ejection fraction (LVEF). Accordingly, hs-cTn assay should considered to be a reliable laboratory test for the early detection of asymptomatic or subclinical cardiotoxic damage in patients undergoing cancer chemotherapy. In accordance with the Fourth Universal Definition of Myocardial Infarction and also taking into account the recent experimental and clinical evidences, the definition of drug-cardiotoxicity should be updated considering the early evaluation of myocardial injury by means of hs-cTn assay. It is conceivable that the combined use of hs-cTn assay and cardiac imaging techniques for the evaluation of cardiotoxicity will significantly increase both diagnostic sensitivity and specificity, and also better prevent chemotherapy-related left ventricular (LV) dysfunction and other adverse cardiac events. However, large randomized clinical trials are needed to evaluate the cost/benefit ratio of standardized protocols for the early detection of cardiotoxicity using hs-cTn assay in patients receiving chemotherapy for malignant diseases.

scholarly journals Use cases of virtual reality to visualize a database

2020 ◽  
Author(s):  
Bernard Quinio ◽  
Nicolas Boulbes ◽  
Pauline De Pechpeyrou ◽  
Baptiste Kotras
Keyword(s):  
Virtual Reality ◽  
Use Cases
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