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Dependable real-time systems typically consist of tasks of mixed-criticality levels with associated fault tolerance (FT) requirements and scheduling them in a fault-tolerant manner to efficiently satisfy these requirements is a challenging problem. From the designers' perspective, the most natural way to specify the task criticalities is by expressing the reliability requirements at task level, without...
Test Design -- how test specifications and test cases are created -- inherently determines the success of testing. However, test design techniques are not always properly applied, leading to poor testing. We have developed an analysis method based on identifying mistakes made when designing the test cases. Using an extended test case template and an expert review, the method provides a systematic...
Controlling the number of preemptions in real time systems is highly desirable in order to achieve an efficient system design in multiple contexts. For example, the delays due to context switches account for high preemption overheads which detrimentally impact the system schedulability. Preemption control can also be potentially used for the efficient control of critical section behaviors in multi-threaded...
The safety critical systems used in avionics, nuclear power plants and emergency medical equipments have to meet stringent reliability and temporal demands. Such demands are met with fault tolerant mechanisms, such as hardware and software redundancy. In this paper, we consider a safety critical application, the dual redundant onboard computer (OBC) system of the Indian Satellite Launch Vehicle and...
After several years of research, even today estimation of software reliability is extremely challenging. The non-deterministic nature of the factors that contribute to the reliability estimation has led to the development of numerous statistical models for this purpose. One of the important factors that contribute to software reliability is testing and the aim of this paper is to present an approach...
Dependable communication is becoming a critical factor due to the pervasive usage of networked embedded systems that increasingly interact with human lives in many real-time applications. Controller Area Network (CAN) has gained wider acceptance as a standard in a large number of industrial applications, mostly due to its efficient bandwidth utilization, ability to provide real-time guarantees, as...
The onboard computer systems used in satellite launch vehicles have stringent timing requirements due the mission critical nature of their tasks. The complete control of launch vehicles is done by onboard computers (OBC) which relate to the navigation guidance, all prelaunch operations and generation of mission critical events. A fault in these systems could lead to a mission failure and catastrophic...
Industrial real-time systems typically have to satisfy complex requirements, mapped to the task attributes, eventually guaranteed by a fixed priority scheduler in a distributed environment. These systems consist of a mix of hard and soft tasks with varying criticality, as well as associated fault tolerance requirements. Time redundancy techniques are often preferred in industrial applications and,...
Dependable real-time systems typically consist of tasks of multiple criticality levels and scheduling them in a fault tolerant manner is a challenging problem. Redundancy in the physical and temporal domains for achieving fault tolerance has been often dealt independently based on the types of errors one needs to tolerate. To our knowledge, there had been no work which tries to integrate fault tolerant...
Real-time applications typically have to satisfy high dependability requirements and require fault tolerance in both value and time domains. A widely used approach to ensure fault tolerance in dependable systems is the N-modular redundancy (NMR) which typically uses a majority voting mechanism. However, NMR primarily focuses on producing the correct value, without taking into account the time dimension...
Real-time systems typically have to satisfy complex requirements, mapped to the task attributes, eventually guaranteed by the underlying scheduler. These systems consist of a mix of hard and soft tasks with varying criticality, as well as associated fault tolerance requirements. Additionally, the relative criticality of tasks could undergo changes during the system evolution. Time redundancy techniques...
Component-based development (CBD) of software, with its successes in enterprise computing, has the promise of being a good development model due to its cost effectiveness and potential for achieving high quality of components by virtue of reuse. However, for systems with dependability concerns, such as real-time systems, a major challenge in using CBD consists of predicting dependability attributes,...
This paper presents a European Master programme on global software engineering (SE), being put forward by four leading institutions from Sweden, UK, Netherlands and Italy. The Global SE European Master (GSEEM) programme aims to provide students with an excellence in SE based on sound theoretical foundations and practical experience, as well as prepare them to participate in global development of complex...
The modeling approach is not used to its full potential in maintenance of legacy systems. Often, models do not even exist. The main reasons being that the economic implications and practical hurdles in manually maintaining models of in-use legacy systems are considered too high by the industry. In this paper, we present a method for automated validation of models automatically generated from recordings...
This work-in-progress (WIP) paper presents server-CAN and highlights its operation and possible vulnerabilities from a fault tolerance point of view. The paper extends earlier work on server-CAN by investigating the behaviour of server-CAN in faulty conditions. Different types of faults are described, and their impact on sever-CAN is discussed, which is the subject of on-going research
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