Test Set Generation for Pairwise Testing Using Genetic Algorithms

Sabharwal, Sangeeta,Aggarwal, Manuj Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.5

In software systems, it has been observed that a fault is often caused by an interaction between a small number of input parameters. Even for moderately sized software systems, exhaustive testing is practically impossible to achieve. This is either due to time or cost constraints. Combinatorial (t-way) testing provides a technique to select a subset of exhaustive test cases covering all of the t-way interactions, without much of a loss to the fault detection capability. In this paper, an approach is proposed to generate 2-way (pairwise) test sets using genetic algorithms. The performance of the algorithm is improved by creating an initial solution using the overlap coefficient (a similarity matrix). Two mutation strategies have also been modified to improve their efficiency. Furthermore, the mutation operator is improved by using a combination of three mutation strategies. A comparative survey of the techniques to generate t-way test sets using genetic algorithms was also conducted. It has been shown experimentally that the proposed approach generates faster results by achieving higher percentage coverage in a fewer number of generations. Additionally, the size of the mixed covering arrays was reduced in one of the six benchmark problems examined.

Initiatives in Expanding Horizons of Nuclear Science in Secondary Education: The Critical Support of the IAEA Technical Cooperation Programme

Sabharwal, Sunil,Gerardo-Abaya, Jane The Korean Association for Radiation Protection 2019 방사선방어학회지 Vol.44 No.3

The contributions of nuclear science and technology in enhancing prosperity and quality of life all over the world and its potential to achieve many important Sustainable Developments Goals (SDGs) of the United Nations are well recognized. It also is now recognized that with fewer students getting attracted to Science, Technology, Engineering and Mathematics (STEM) in general and nuclear science and technology (NST) in particular; hence, there is a vital need to reach out to young students to provide the crucial human resources needed for these endeavours to continue in this highly specialized area. The success of a recently completed IAEA project related to introducing NST during 2012-2016 in secondary schools in the Asia-Pacific region countries encouraged the formulation of a new IAEA TC project RAS0079 entitled "Educating Secondary Students and Science Teachers on Nuclear Science and Technology" for 2018-2021, focusing on enhancing existing educational approaches through training and development opportunities both for teachers and students. The project aims at reaching a million students during the project duration while keeping the depth of learning between teacher and student. The strategy of executing the project, implementation status and its impact so far is presented in this paper.

Test Set Generation for Pairwise Testing Using Genetic Algorithms

Sangeeta Sabharwal,Manuj Aggarwal 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.5

In software systems, it has been observed that a fault is often caused by an interaction between a small numberof input parameters. Even for moderately sized software systems, exhaustive testing is practically impossibleto achieve. This is either due to time or cost constraints. Combinatorial (t-way) testing provides a techniqueto select a subset of exhaustive test cases covering all of the t-way interactions, without much of a loss to thefault detection capability. In this paper, an approach is proposed to generate 2-way (pairwise) test sets usinggenetic algorithms. The performance of the algorithm is improved by creating an initial solution using theoverlap coefficient (a similarity matrix). Two mutation strategies have also been modified to improve theirefficiency. Furthermore, the mutation operator is improved by using a combination of three mutationstrategies. A comparative survey of the techniques to generate t-way test sets using genetic algorithms was alsoconducted. It has been shown experimentally that the proposed approach generates faster results by achievinghigher percentage coverage in a fewer number of generations. Additionally, the size of the mixed coveringarrays was reduced in one of the six benchmark problems examined.

Novel Approach for Deriving Test Scenarios and Test Cases from Events

Sandeep K Singh,Sangeeta Sabharwal,J P Gupta 한국정보처리학회 2012 Journal of information processing systems Vol.8 No.2

A Novel Approach for Deriving Test Scenarios and Test Cases from Events

Singh, Sandeep K.,Sabharwal, Sangeeta,Gupta, J.P. Korea Information Processing Society 2012 Journal of information processing systems Vol.8 No.2

Safety critical systems, real time systems, and event-based systems have a complex set of events and their own interdependency, which makes them difficult to test ma Safety critic Safety critical systems, real time systems, and event-based systems have a complex set of events and their own interdependency, which makes them difficult to test manually. In order to cut down on costs, save time, and increase reliability, the model based testing approach is the best solution. Such an approach does not require applications or codes prior to generating test cases, so it leads to the early detection of faults, which helps in reducing the development time. Several model-based testing approaches have used different UML models but very few works have been reported to show the generation of test cases that use events. Test cases that use events are an apt choice for these types of systems. However, these works have considered events that happen at a user interface level in a system while other events that happen in a system are not considered. Such works have limited applications in testing the GUI of a system. In this paper, a novel model-based testing approach is presented using business events, state events, and control events that have been captured directly from requirement specifications. The proposed approach documents events in event templates and then builds an event-flow model and a fault model for a system. Test coverage criterion and an algorithm are designed using these models to generate event sequence based test scenarios and test cases. Unlike other event based approaches, our approach is able to detect the proposed faults in a system. A prototype tool is developed to automate and evaluate the applicability of the entire process. Results have shown that the proposed approach and supportive tool is able to successfully derive test scenarios and test cases from the requirement specifications of safety critical systems, real time systems, and event based systems.

Control of Advanced Reactor-coupled Heat Exchanger System: Incorporation of Reactor Dynamics in System Response to Load Disturbances

Isaac Skavdahl,Vivek Utgikar,Richard Christensen,Minghui Chen,Xiaodong Sun,Piyush Sabharwall 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.6

Alternative control schemes for an Advanced High Temperature Reactor system consisting of a reactor, an intermediate heat exchanger, and a secondary heat exchanger (SHX) are presented in this paper. One scheme is designed to control the cold outlet temperature of the SHX (Tco) and the hot outlet temperature of the intermediate heat exchanger (Tho2) by manipulating the hot-side flow rates of the heat exchangers (Fh/Fh2) responding to the flow rate and temperature disturbances. The flow rate disturbances typically require a larger manipulation of the flow rates than temperature disturbances. An alternate strategy examines the control of the cold outlet temperature of the SHX (Tco) only, since this temperature provides the driving force for energy production in the power conversion unit or the process application. The control can be achieved by three options: (1) flow rate manipulation; (2) reactor power manipulation; or (3) a combination of the two. The first option has a quicker response but requires a large flow rate change. The second option is the slowest but does not involve any change in the flow rates of streams. The third option appears preferable as it has an intermediate response time and requires only a minimal flow rate change.

Capture of Volatile Organic Iodine Species Using Mordenites

Tejaswini Vaidya,John P. Stanford,Nicolene van Rooyen,Krishnan Raja,Vivek Utgikar,Piyush Sabharwall 한국방사성폐기물학회 2023 방사성폐기물학회지 Vol.21 No.2

The emission of off-gas streams from used fuel recycling is a concern in nuclear energy usage as they contain radioactive compounds, such as, 3H, 14C, 85Kr, 131I, and 129I that can be harmful to human health and environment. Radioactive iodine, 129I, is particularly troublesome as it has a half-life of more than 15 million years and is prone to accumulate in human thyroid glands. Organic iodides are hazardous even at very low concentrations, and hence the capture of 129I is extremely important. Dynamic adsorption experiments were conducted to determine the efficiency of sodium mordenite, partially exchanged silver mordenite, and fully exchanged silver mordenite for the removal of methyl iodide present at parts per billion concentrations in a simulated off-gas stream. Kinetic analysis of the system was conducted incorporating the effects of diffusion and mass transfer. The possible reaction mechanism is postulated and the order of the reaction and the values of the rate constants were determined from the experimental data. Adsorbent characterization is performed to investigate the nature of the adsorbent before and after iodine loading. This paper will offer a comprehensive understanding of the methyl iodide behavior when in contact with the mordenites.