Model-Based Verification of Embedded Software

Current advances in model-based develop-­ ment technology indicate that embedded- software developers can expect more tool support for the whole embedded-software spectrum, from applications to system software.     

Model-Based Design, Development and Validation for UAS Critical Software

This paper focuses on the major phases present in the development of critical software for UAS: design, development, testing and validation with flying experiments. A model-based approach is the backbone of all these development phases. The presented approach enables the researchers or engineers to work over the whole development cycle with the same tools, and produces an improvement over the classical design cycle. The model-based approach is illustrated with the development of guidance, navigation and control algorithms applied to rotary-wing UAVs. The paper discusses several implementation issues, including the integration of a hardware in the loop (HWIL) test environment within the model-based development cycle. Finally, several simulations and experimental results for this application are shown.     

Verification and Validation of Simulations Against Holism

Minds and Machines - It has been argued that the Duhem problem is renewed with computational models since model assumptions having a representational aim and computational assumptions cannot be...     

Model-Based Verification of a Security Protocol for Conditional Access to Services

We use the formal language LOTOS to specify and verify the robustness of the Equicrypt protocol under design in the European OKAPI project for conditional access to multimedia services. We state some desired security properties and formalize them. We describe a generic intruder process and its modelling, and show that some properties are falsified in the presence of this intruder. The diagnostic sequences can be used almost directly to exhibit the scenarios of possible attacks on the protocol. Finally, we propose an improvement of the protocol which satisfies our properties.     

Experimental Validation of a Helicopter Autopilot Design using Model-Based PID Control

Autonomous helicopter flight provides a challenging control problem. In order to evaluate control designs, an experimental platform must be developed in order to conduct flight tests. However, the literature describing existing platforms focuses on the hardware details, while little information is given regarding software design and control algorithm implementation. This paper presents the design, implementation, and validation of an experimental helicopter platform with a primary focus on a software framework optimized for controller development. In order to validate the operation of this platform and provide a basis for comparison with more sophisticated nonlinear designs, a PID controller with feedforward gravity compensation is derived using the generally accepted small helicopter model and tested experimentally.     

Tutorial Series 7 Software Project Verification and Validation

From prototype techniques presently used, new directions are emerging that lead to improved management and earlier detection of errors.     

建模与仿真的校核与验证技术综述

系统建模与仿真是人类认识世界的三大方法之一。随着系统仿真技术的不断发展,建模与仿真在军事、经济等方面发挥着日益重要的作用。与此同时,人们也逐步认识到建模与仿真的可信度问题,对模型与仿真正确性和可信度的要求也越来越高。校核与验证（V＆V）技术是系统仿真技术的关键技术之一,用于评价模型与仿真的可信度。首先介绍建模与仿真（M＆S）的VV＆A的基本概念和重要作用,然后详细介绍非正规的、静态的和正规的校核与验证技术并分析各自的特点,最后论述M＆S生命周期中V＆V活动的实施及V＆V技术的适用范围。     

联邦开发过程中的校核、验证与确认（VV＆A）

对联邦的VV＆A不仅能够使每一步的工作得到跟踪和衡量,还使每一步能够减少多余的工作量,巩固需要加强的工作,明确开发人员的角色和职责,从而使人力、时间、资金等资源得到更加有效率的利用,仿真的结果变得更加可预测和准确,在很大程度上减少了编程的风险.联邦成员描述了仿真模型的各对象类、交互类、相关的属性、参数等信息,而联邦是各联邦成员的有机集成,构成具有特定功能的仿真系统.因此,联邦成员的正确性是联邦正确性的前提,决定了仿真系统的成败.在VV＆A的过程中,最好采用一些自动化工具以便于工作,同时要根据具体仿真系统的实际情况来确定VV＆A所需要作的工作.     

系统建模与仿真应用的校验、确认与验收

以美国国防部（DoD）近年来对建模与仿真（M＆S）应用所做的校验、确认与验收（VV＆A）研究工作为基础,介绍了关于M＆S应用的校验、确认、验收、鉴定等概念;结合软件工程的3P指标提出一种通用的形式化表示的M＆S应用VV＆A框架;讨论了M＆S应用可信度指标的层次化体系的建立与评价方法,引入了Kiviat图;最后介绍了一个用于M＆S可信度评价的计算机软件平台——EE（Evaluation Environment,评价环境）。     

Validation, Verification, and Testing for the Individual Programmer

Good programming demands sound testing, verification, and validation techniques throughout the life cycle–even if the development environment has limited support and resources.     

分布仿真的建模与验模研究

分布仿真技术正在成为影响国防事业发展的关键技术之一。仿真技术将应用于对武器装备的全寿命、全系统、全方位管理 ,建模与仿真的对象将是复杂的大系统。因此 ,建模与仿真必须满足高层体系结构HLA及任务空间概念模型CMMS ,它是建立仿真的一致性与权威性表达的基础 ,同时采用新的VV&A工具     

建模与仿真中数据VV＆C的研究

在建模的过程中，数据在一定程度上决定了我们建立的模型能否真实地反映实际；因此，所用的数据是不是正确就是建模成功与否的关键。该文首先介绍了建模与仿真过程中数据的概念和分类；接着讨论了数据校核、验证和确认的概念，并简要地介绍了数据校核、验证和确认的一般过程和方法。最后，给出了数据校核、验证和确认的一个实例。     

基于虚拟样机的仿真系统校核、验证与确认研究

虚拟样机模型的正确性和精确度直接影响到仿真的置信度,如何保证建立的计算机仿真模型的正确性是虚拟样机建模的一个重要问题。首先对虚拟样机技术的特点及其仿真步骤进行了描述;然后,在介绍仿真系统校核、验证与确认概念的基础上,讨论了分布交互仿真系统校核、验证与确认的原则;根据虚拟样机的特点,研究制定了虚拟样机仿真系统的校核、验证与确认的七步过程,重点对虚拟样机仿真系统的模型验证方法进行分析;最后,提出了的虚拟样机校核、验证与确认过程中应该遵循的原则。