The Experts below are selected from a list of 3141 Experts worldwide ranked by ideXlab platform

Jose Matias Rivero - One of the best experts on this subject based on the ideXlab platform.

  • improving mockup based requirement specification with end user annotations
    International Conference on Agile Software Development, 2018
    Co-Authors: Nahime Torres, Jose Matias Rivero, Matias Urbieta, Gustavo Rossi, F J Dominguezmayo
    Abstract:

    Agile approaches, one of the key methodologies used in today’s software projects, often rely on user interface Mockups for capturing the goals that the system must satisfy. Mockups, as any other requirement artifact, may suffer from ambiguity and contradiction issues when several points of view are surveyed/elicited by different analysts. This article introduces a novel approach that enhances Mockups with friendly end-user annotations that helps formalizing the requirements and reducing or identifying conflicts. We present an evaluation of the approach in order to measure how the use of annotations improves requirements quality.

  • mockup driven development providing agile support for model driven web engineering
    Information & Software Technology, 2014
    Co-Authors: Jose Matias Rivero, Gustavo Rossi, Julian Grigera, Esteban Robles Luna, Francisco Montero, Martin Gaedke
    Abstract:

    Context: Agile software development approaches are currently becoming the industry standard for Web Application development. On the other hand, Model-Driven Web Engineering (MDWE) methodologies are known to improve productivity when building this kind of applications. However, current MDWE methodologies tend to ignore important aspects of Web Applications development supported by agile processes, such as constant customer feedback or early design of user interfaces. Objective: In this paper we analyze the difficulties of supporting agile features in MDWE methodologies. Then, we propose an approach that eases the incorporation of well-known agile practices to MDWE. Method: We propose using User Interface prototypes (usually known as Mockups) as a way to start the modeling process in the context of a mixed agile-MDWE process. To assist this process, we defined a lightweight metamodel that allows modeling features over Mockups, interacting with end-users and generating MDWE models. Then, we conducted a statistical evaluation of both approaches (traditional vs. mockup-based modeling). Results: First we comment on how agile features can be added to MDWE processes using Mockups. Then, we show by means of a quantitative study that the proposed approach is faster, less error-prone and still as complete as traditional MDWE processes. Conclusion: The use of Mockups to guide the MDWE process helps in the reduction of the development cycle as well as in the incorporation of agile practices in the model-driven workflow. Complete MDWE models can be built and generated by using lightweight modeling over User Interface Mockups, and this process suggests being more efficient, in terms of errors and effort, than traditional modeling in MDWE.

Gustavo Rossi - One of the best experts on this subject based on the ideXlab platform.

  • improving mockup based requirement specification with end user annotations
    International Conference on Agile Software Development, 2018
    Co-Authors: Nahime Torres, Jose Matias Rivero, Matias Urbieta, Gustavo Rossi, F J Dominguezmayo
    Abstract:

    Agile approaches, one of the key methodologies used in today’s software projects, often rely on user interface Mockups for capturing the goals that the system must satisfy. Mockups, as any other requirement artifact, may suffer from ambiguity and contradiction issues when several points of view are surveyed/elicited by different analysts. This article introduces a novel approach that enhances Mockups with friendly end-user annotations that helps formalizing the requirements and reducing or identifying conflicts. We present an evaluation of the approach in order to measure how the use of annotations improves requirements quality.

  • mockup driven development providing agile support for model driven web engineering
    Information & Software Technology, 2014
    Co-Authors: Jose Matias Rivero, Gustavo Rossi, Julian Grigera, Esteban Robles Luna, Francisco Montero, Martin Gaedke
    Abstract:

    Context: Agile software development approaches are currently becoming the industry standard for Web Application development. On the other hand, Model-Driven Web Engineering (MDWE) methodologies are known to improve productivity when building this kind of applications. However, current MDWE methodologies tend to ignore important aspects of Web Applications development supported by agile processes, such as constant customer feedback or early design of user interfaces. Objective: In this paper we analyze the difficulties of supporting agile features in MDWE methodologies. Then, we propose an approach that eases the incorporation of well-known agile practices to MDWE. Method: We propose using User Interface prototypes (usually known as Mockups) as a way to start the modeling process in the context of a mixed agile-MDWE process. To assist this process, we defined a lightweight metamodel that allows modeling features over Mockups, interacting with end-users and generating MDWE models. Then, we conducted a statistical evaluation of both approaches (traditional vs. mockup-based modeling). Results: First we comment on how agile features can be added to MDWE processes using Mockups. Then, we show by means of a quantitative study that the proposed approach is faster, less error-prone and still as complete as traditional MDWE processes. Conclusion: The use of Mockups to guide the MDWE process helps in the reduction of the development cycle as well as in the incorporation of agile practices in the model-driven workflow. Complete MDWE models can be built and generated by using lightweight modeling over User Interface Mockups, and this process suggests being more efficient, in terms of errors and effort, than traditional modeling in MDWE.

Arsen Krikor Melikov - One of the best experts on this subject based on the ideXlab platform.

Qingyan Chen - One of the best experts on this subject based on the ideXlab platform.

  • predicting airflow distribution and contaminant transport in aircraft cabins with a simplified gasper model
    Journal of Building Performance Simulation, 2016
    Co-Authors: Ruoyu You, Daniel Wei, Chao-hsin Lin, Jun Chen, Wei Liu, Qingyan Chen
    Abstract:

    This study investigated the air distribution and contaminant transport in aircraft cabins with gaspers by using computational fluid dynamics (CFD). If the detailed gasper geometry were used in the CFD simulations, the grid number would be unacceptably high. To reduce the grid number, this investigation proposed a method for simplifying the gasper geometry. The method was then validated by two sets of experimental data obtained from a cabin mockup and a real aircraft cabin. It was found that for the cabin mockup, the CFD simulation with the simplified gasper model reduced the grid number from 1.58 to 0.3 million and the computing cost from 2 days to 1 hour without compromising the accuracy. In the five-row economy-class cabin of the MD-82 airplane, the CFD simulation with the simplified gasper model was acceptable in predicting the distribution of air velocity, air temperature, and contaminant concentration.

  • determination of particle deposition in enclosed spaces by detached eddy simulation with the lagrangian method
    Atmospheric Environment, 2011
    Co-Authors: Miao Wang, Chao-hsin Lin, Qingyan Chen
    Abstract:

    Abstract Accurate prediction of particle deposition in airliner cabins is important for estimating the exposure risk of passengers to infectious diseases. This study developed a Detached Eddy Simulation (DES) model with a modified Lagrangian method. The computer model was validated with experimental data for particle deposition in a cavity with natural convection and with air velocity, air temperature, and particle concentration data from a four-row, twin-aisle cabin mockup. The validation showed that the model performed well for the two cases. Then the model was further used to study particle deposition in the cabin mockup with seven sizes of particles. The particles were assumed to be released from an index passenger due to breathing or talking at zero velocity and due to coughing at a suitable jet velocity. This study can provide quantitative particle deposition distributions for different surfaces and particles removed by cabin ventilation.

Chikara Konno - One of the best experts on this subject based on the ideXlab platform.

  • development of a low activation concrete shielding wall by multi layered structure for a fusion reactor
    Journal of Nuclear Materials, 2011
    Co-Authors: Satoshi Sato, Kentaro Ochiai, Toshio Maegawa, Kenji Yoshimatsu, K Sato, Akira Nonaka, Kosuke Takakura, Chikara Konno
    Abstract:

    Abstract A multi-layered concrete structure has been developed to reduce induced activity in the shielding for neutron generating facilities such as a fusion reactor. The multi-layered concrete structure is composed of: (1) an inner low activation concrete, (2) a boron-doped low activation concrete as the second layer, and (3) ordinary concrete as the outer layer of the neutron shield. With the multi-layered concrete structure the volume of boron is drastically decreased compared to a monolithic boron-doped concrete. A 14 MeV neutron shielding experiment with multi-layered concrete structure Mockups was performed at FNS and several reaction rates and induced activity in the Mockups were measured. This demonstrated that the multi-layered concrete effectively reduced low energy neutrons and induced activity.

  • measurement of tritium production rate in water cooled pebble bed multi layered blanket mockup by dt neutron irradiation experiment
    Nuclear Fusion, 2007
    Co-Authors: Satoshi Sato, Kentaro Ochiai, Yury Verzilov, Masayuki Wada, Naoyoshi Kubota, Keitaro Kondo, M Yamauchi, T Nishitani, Chikara Konno
    Abstract:

    For the first time, tritium production rates in the water cooled pebble bed blanket are experimentally examined by using DT neutrons with two partial Mockups; multi-layered mockup with water and pebble bed mockup. Tritium production rates (TPRs) are calculated by numerical analyses using Monte Carlo code MCNP-4C with nuclear data libraries FENDL-2.1 and JENDL-3.3. For experimental analysis on the pebble bed mockup, precise modelling method is proposed using the hexagonal close-packed heterogeneous geometry. Prediction uncertainties of TPRs are clarified through the experimental analyses. Ratios of the calculation results to the experimental results on local TPRs are 0.89–1.10 in the multi-layered mockup, and 0.95–1.13 in the pebble bed mockup. The calculation results on integrated tritium productions agree well with the experimental ones in both Mockups. It is clarified that integrated tritium productions can be accurately evaluated.