This paper presents a survey of existing literature, standards, methods, and best practices for security requirements elicitation in the field of systemsengineering. Despite the abundance of research on requirements ...
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ISBN:
(数字)9798350353723
ISBN:
(纸本)9798350353730
This paper presents a survey of existing literature, standards, methods, and best practices for security requirements elicitation in the field of systemsengineering. Despite the abundance of research on requirements engineering, there is a notable scarcity of resources addressing security requirements from a systemsengineering perspective. This work integrates insights from both software centric security engineering and traditional systemsengineering to offer a consolidated reference for systems engineers. Key areas reviewed include relevant systemsengineering standards, Model-Based systemsengineering (MBSE) methods, systems Theory approaches, and software security requirements engineering practices. This survey aims to provide a valuable resource for systems engineers striving to enhance security requirements development during system design.
作者：
Jessie MaSystems Design Engineering
Faculty of Engineering School of Environment Enterprise and Development Faculty of Environment University of Waterloo Waterloo Canada
A new cross-faculty course was developed for engineering and environment students at the University of Waterloo. This offers an interdisciplinary learning experience in line with the institution’s vision for collabor...
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ISBN:
(数字)9798350371628
ISBN:
(纸本)9798350371635
A new cross-faculty course was developed for engineering and environment students at the University of Waterloo. This offers an interdisciplinary learning experience in line with the institution’s vision for collaboration in addressing the world’s most pressing challenges, including the climate catastrophe. The course aimed to equip students to better appreciate the interconnectedness and complexity of real-world energy projects. The STEEP framework was created to aid students to systematically consider social, technical, environmental, economic, and policy factors. A case study in using the STEEP model for wind power is presented. Overall, students responded with positive feedback and appreciated the structure that the STEEP framework provided. Students applied the STEEP framework in a couple of group assignments. Planned improvements for future course offerings include: more technical content; streamlined readings; short reflection papers; soft skill training; and increased interaction between engineering and environment students.
Training neural networks by using conventional supervised backpropagation algorithms is a challenging task. This is due to significant limitations, such as the risk for local minimum stagnation in the loss landscape o...
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Training neural networks by using conventional supervised backpropagation algorithms is a challenging task. This is due to significant limitations, such as the risk for local minimum stagnation in the loss landscape of neural networks. That may prevent the network from finding the global minimum of its loss function and therefore slow its convergence speed. Another challenge is the vanishing and exploding gradients that may happen when the gradients of the loss function of the model become either infinitesimally small or unmanageably large during the training. That also hinders the convergence of the neural models. On the other hand, the traditional gradient-based algorithms necessitate the pre-selection of learning parameters such as the learning rates, activation function, batch size, stopping criteria, and others. Recent research has shown the potential of evolutionary optimization algorithms to address most of those challenges in optimizing the overall performance of neural networks. In this research, we introduce and validate an evolutionary optimization framework to train multilayer perceptrons, which are simple feedforward neural networks. The suggested framework uses the recently proposed evolutionary cooperative optimization algorithm, namely, the dynamic group-based cooperative optimizer. The ability of this optimizer to solve a wide range of real optimization problems motivated our research group to benchmark its performance in training multilayer perceptron models. We validated the proposed optimization framework on a set of five datasets for engineering applications, and we compared its performance against the conventional backpropagation algorithm and other commonly used evolutionary optimization algorithms. The simulations showed the competitive performance of the proposed framework for most examined datasets in terms of overall performance and convergence. For three benchmarking datasets, the proposed framework provided increases of 2.7%, 4.83%, and
This paper systematically introduces and reviews a scientific exploration of reliability called the belief *** with the origin of reliability engineering,the problems of present theories for reliability engineering ar...
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This paper systematically introduces and reviews a scientific exploration of reliability called the belief *** with the origin of reliability engineering,the problems of present theories for reliability engineering are summarized as a query,a dilemma,and a ***,through philosophical reflection,we introduce the theoretical solutions given by belief reliability theory,including scientific principles,basic equations,reliability science experiments,and mathematical *** basic methods and technologies of belief reliability,namely,belief reliability analysis,function-oriented belief reliability design,belief reliability evaluation,and several newly developed methods and technologies are sequentially elaborated and *** on the above investigations,we summarize the significance of belief reliability theory and make some prospects about future research,aiming to promote the development of reliability science and engineering.
Animals exhibit remarkable mobility and adaptability to their *** these advantages,various types of robots have been *** achieve path tracking control for the underwater hexapod robot,a path tracking control system ha...
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Animals exhibit remarkable mobility and adaptability to their *** these advantages,various types of robots have been *** achieve path tracking control for the underwater hexapod robot,a path tracking control system has been *** this system,a Line-of-Sight(LOS)guidance system is utilized to generate the desired heading angle during the path tracking process.A heading tracking controller and a speed tracking controller are designed based on the super-twisting sliding mode *** logic is employed to establish the nonlinear relationship between the output of the upper-level controller,which includes force/torque,and the input parameters of the Central Pattern Generator(CPG)***,the effectiveness of the proposed method is verified through simulation and *** results demonstrate that the robot exhibits good tracking accuracy,as well as stability and coordination in *** designed path tracking system enables the underwater hexapod robot to rapidly and accurately track the desired path.
作者：
Yin WuYan SunDepartment of Biochemical Engineering
School of Chemical Engineering and Technology and Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology(Ministry of Education)Tianjin UniversityTianjin 300350China
Biocatalysis in organic solvents(OSs)has numerous important applications,but native enzymes in OSs often exhibit limited catalytic ***,we proposed a computation-aided surface charge engineering strategy to improve the...
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Biocatalysis in organic solvents(OSs)has numerous important applications,but native enzymes in OSs often exhibit limited catalytic ***,we proposed a computation-aided surface charge engineering strategy to improve the catalytic performance of haloalkane dehalogenase DhaA in OSs based on the energetic analysis of substrate binding to the DhaA *** variants with enhanced OS resistance were obtained by replacing negative charged residues on the surface with positive charged residue(Arg).Particularly,a four-substitution variant E16R/E93R/E121R/E257R exhibited the best catalytic performance(five-fold improvement in OS resistance and seven-fold half-life increase in 40%(vol)dimethylsulfoxide).As a result,the overall catalytic performance of the variant could be at least 26 times higher than the wild-type *** spectroscopy and molecular dynamics simulation studies revealed that the residue substitution mainly enhanced OS resistance from four aspects:(a)improved the overall structural stability,(b)increased the hydrophobicity of the local microenvironment around the catalytic triad,(c)enriched the hydrophobic substrate around the enzyme molecule,and(d)lowered the contact frequency between OS molecules and the catalytic *** findings validate that computationaided surface charge engineering is an effective and ingenious rational strategy for tailoring enzyme performance in OSs.
In agile Cyber-physical Production System (CPPS) engineering, multi-disciplinary teams work concurrently and iteratively on various CPPS engineering artifacts, based on engineering models and Product-Process-Resource ...
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Unmanned Aerial systems (UASs) have become essential for targeting high-value assets due to their low cost and operational versatility, posing significant battlefield challenges. This study addresses the need for a lo...
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ISBN:
(数字)9798331508180
ISBN:
(纸本)9798331508197
Unmanned Aerial systems (UASs) have become essential for targeting high-value assets due to their low cost and operational versatility, posing significant battlefield challenges. This study addresses the need for a low-cost, lightweight counterUAS (C-UAS) system that integrates seamlessly into infantry platoons. Using a model-based systemsengineering (MBSE) approach, stakeholder feedback informed use cases and operational requirements, allowing for the development of the system's logical architecture. The study incorporated prototyping to support the development of the system's physical architecture. The prototype featured a Raspberry Pi and a software-defined radio capable of detecting drones and emitting a jamming signal. Soldiers interfaced with the prototype via the Android Tactical Assault Kit (ATAK), a system already deployed on the battlefield. Power was sourced from the conformal batteries worn by soldiers. The prototyping effort yielded critical insights into technical requirements, which were incorporated into the system's design. The lightweight, compact prototype demonstrates significant potential for field deployment, offering infantry units a costeffective, reliable solution for detecting and countering UAS threats. This study provides a foundation for future C-UAS development, addressing the urgent need for enhanced counterUAS capabilities in modern military operations.
Shaped charge warhead is important for enhancing the damage performance of underwater *** paper used finite element analysis software and based on JPC water penetration experiments to examine the influence of liner pa...
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Shaped charge warhead is important for enhancing the damage performance of underwater *** paper used finite element analysis software and based on JPC water penetration experiments to examine the influence of liner parameters(wall thickness,material),charge aspect ratio,and stand-off distance on the movement characteristics of JPC in *** findings reveal that the head diameter of the JPC increases and experiences significant erosion after entering the water,the effective length of the JPC in water undergoes two distinct phases:a growth phase and a decrease phase,with the velocity of the JPC decaying *** the liner thickness,stand-off distance and the charge aspect ratio can improve the erosion resistance and the velocity retention capacity of the *** optimal ranges for liner thickness and stand-off distance are 0.0363D_(k) to 0.0545D_(k)(D_(k) is the charge diameter),the stand-off distance should be within 1.0D_(k).After the charge aspect ratio higher than 1.25,the charge structure exerts minimal influence the movement characteristics of the JPC in *** density plays a crucial role in the velocity decay pattern of the JPC during *** with higher densities exhibit superior velocity retention capabilities in water,with the velocity decay pattern converging if the densities are ***,copper,tantalum and tungsten liners are deemed appropriate for underwater shaped charge ***,the results will provide an important reference for the design of underwater shaped charge warhead.
Since the first use of the term "systemsengineering" in the 1940’s, the discipline has progressed significantly as the complexity of systems and the development of technology continue to increase. This pap...
Since the first use of the term "systemsengineering" in the 1940’s, the discipline has progressed significantly as the complexity of systems and the development of technology continue to increase. This paper examines the current state and evolution of systemsengineering and systemsengineering education. The paper first identifies the current state of systemsengineering by recognizing systems engineers' roles, responsibilities, and expectations. Following the current state of systemsengineering, the changes needed are addressed through multiple frameworks and skill sets that will be critical to the evolving industry. The paper also explores the future of systems education focusing on content, content delivery, cost, and student cooperation. The analysis suggests that universities could adjust their curriculum to better align with the demands of the industry. The paper concludes with an overview of potential solutions designed to meet the needs of systems engineers by preparing them for the growing and multifaceted industry demands of the future.
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