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Large-scale software systems like Amazon and healthcare.gov are used by thousands or millions of people every day. To ensure the quality of these systems, load testing is a required testing procedure in addition to the conventional functional testing techniques like unit and system integration testing. One of the important requirements of load testing is to create a field-like test environment. Unfortunately,...
We describe a framework for model identification and model order reduction (MOR) of highly dynamic microgrids based on a high fidelity hardware-in-the-loop (HIL) platform. A synchronous generator that is connected in different configurations is analyzed to analytically obtain small-signal linearized models which are compared against HIL-obtained data. The framework is applied to a small microgrid...
In the healthcare context, decisions are crucial. Therefore Decision Support Systems must ensure a high level of dependability. In order to justify the required dependability level, its requirements must be addressed seriously during the system life cycle. To overcome this issue, our approach is based on Model Driven Architecture to model dependability requirements from the earlier stages of decision...
This study applies competency theory to project management. The purpose of this study is to test for multi-group invariance of ICT project managers' competencies across two groups (low and high experience). The baseline model consisted of four latent variables: knowledge areas, technical and managerial skill, personal attributes, and efficiency of project management. The survey sample consisted of...
Multi-tiered transactional web applications are frequently used in enterprise based systems. Due to their inherent distributed nature, pre-deployment testing for high-availability and varying concurrency are important for post-deployment performance. Accurate performance modeling of such applications can help estimate values for future deployment variations as well as validate experimental results...
The research community has broadly recognized the importance of the validation of non-functional properties including performance and dependability requirements. However, the results of a systematic survey we carried out evidenced the lack of a standard notation for designing non-functional test cases. For some time, the greatest attention of Model-Based Testing (MBT) research has focused on functional...
The response of silicon-based MEMS diaphragms to applied pressure was studied to determine their ability to effectively measure the extent of blast overpressure. Different pressures (0–100 psi) were applied to silicon diaphragms of different diameters (1200, 1500, and 2200 ) to study their mechanical response under both static and dynamic conditions using experimental and finite element...
The aim of this paper is to describe a general methodology for testing the mobile network core with traffic generated from a simulated access-segment. A main element of this methodology is to derive load models and mobility models from real-life traffic patterns, and use these — as well as prerecorded protocol messages — in the process. The Evolved Packet Core (EPC) of Long Term Evolution (LTE) provides...
Unit testing(UT) is an important step in ensuring the quality of software. Considerable effort is spent in unit testing. There are several frameworks to help with UT. Some common frameworks are Cunit, Junit, Nunit etc. All of these have very similar capabilities. They provide capabilities for organizing and registering tests, registration of test initializers and finalizers, test execution and asserting...
Load testing of IT applications is fraught with the challenges of time to market, quality of results, high cost of commercial tools, and accurately representing production like scenarios. It would help IT projects to be able to test with a small number of users and extrapolate to scenarios with much larger number of users. This in turn will cut down cycle times and costs and allow for a variety of...
The study aimed at optimizing the anti-whiplash performance of the seat in rear impact by using orthogonal experimental design (OED) and comprehensive equilibrium methods. Firstly, according to the Euro NCAP evaluation procedure for whiplash injury, a rear impact model was developed with BioRID II dummy, sled system, seat and seat belt by using MADYMO code. Then, the anti-whiplash performance of the...
Based on Analytic Hierarchy Process Method and the consistency check, the article constructs the quantitative model for sport training classes' quality evaluation. The evaluation model includes 3 levels of indicators. The first level indicators of quantitative evaluation model are the training effect, training process, training load, preparation before class and training attitude; the second level...
In the practice of process-centric systems implementations, business process modeling is becoming more crucial. This paper introduces an approach to automatically generate test suites for the process paths to check the consistency, which is very important, between the business process model and the implementation of Enterprise System. The paper also presents a supporting tool to apply this approach...
In this paper, a new formulation at the small time scale is proposed for multi-scale fatigue crack growth analysis and an in-situ SEM testing methodology is used to verify the basic hypotheses of the model.Very high resolution imaging analysis is performed to quantify the crack tip deformation behaviour and crack growth kinetics. In the in-situ SEM testing, the crack closure phenomenon is observed...
The article constructs the quantitative model for sport training quality monitor by using Analytic Hierarchy Process method. The first level indicators of quantitative monitor model are the training effect, training process, training load, preparation before class and training attitude, the second level indicators are 17 items in total. By testing the construction of quantitative model to prove that...
User interface testing is a very important but time consuming activity. To automate and systematize the testing process, models can be used to derive test cases automatically-a technique known as model-based testing. Given a model representing the intended system behavior and a test suite derived from the model or produced manually, the coverage of the test suite over the model is an important early...
In this paper, a model of the large crane lifting system has been developed in the AMESim environment. The comparison between the simulation results and the experimental data shows good agreement in both time and frequency domains, indicating the correctness of the model. Furthermore, the causes of pressure pulsations of the lifting system are described by means of dynamic simulation and experimental...
Although organizational slack research posits various relationships between a firm's slack resources and innovation, findings to date have been ambiguous. To provide insight into this relationship, this paper studies the impact of organizational slack on technological innovation by using empirical analysis based on the data get from 283 firms in Henan Province by questionnaire. The result shows that...
The paper introduces the concept of model-based performance testing, which we plan to pursue in our research. The underlying idea is to describe various performance aspects as well as functional aspects of a software system using modeling languages like UML, and from the resulting models to automatically design tests that can be used for performance testing. In our research, we also plan to focus...
One of the key components of the tire testing machine is the loading mechanism, ability to accurately simulate the gesture and loaded situation of tire work is the main point of the design. One model for loading mechanism is presented in this paper, better implementation of the simulation of the attitude of the tires movement of leaning and deviation. Define the drive mode and drive functions of the...
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