UNIQUIMER 3D, a software system for structural DNA nanotechnology design, analysis and evaluation

In the optical fiber communication system of high-speed and large capacity, the dispersion is one of the main technical indicators. The dispersion causes the light pulse broadening, so it leads to the distortion of signal transmission and BER (bit error rate). The main research is the single-mode optical fiber dispersion compensation. The design and performance of system structure on the dispersion compensation fiber communication system is accomplished by using of the optic system optical fiber communication system simulation. Through the analysis of system structure and the research of the performance of the key components of the system, the output signal waveform is simulated and the influence of the output signal waveform by the system structure and key components performance of the receiving end is compared. The design can reduce the system dispersion.

Graphic Statics offers a geometrical framework for the design & analysis of structural systems with reciprocity between the ‘form’ and ‘force’ diagrams being a fundamental notion. In this paper we provide a detailed illustration and explanation of Maxwell’s reciprocal construction for 2-dimensional trusses through a 3-dimensional paraboloid of revolution. Even though Maxwell briefly mentions this method there is no record of the detailed construction. The main focus of this research is placed on the synthesis of Poncelet duality in projective geometry and of reciprocity in graphic statics resulting in the definition of a generalised dual statement for the construction of reciprocal diagrams (Maxwell 2D & Rankine 3D). This is based on the construction of their higher dimensional polyhedral Airy stress functions, using conic sections. We generalise the construction for other conics, such as the sphere and ellipsoid, and we extend the definition for 3-dimensional trusses and corresponding higher-dimensional conic sections.

Stochastic model updating using distance discrimination analysis

SAP2000 is well-known commercial software for analysis and design of structural systems that is equipped with an open application programming interface (OAPI). In this work, a code written in C# able to solve three-dimensional topology optimization problems is presented, where a topology optimization framework was integrated into SAP2000 taking advantage of its OAPI feature. The code is partially based on the 99 and 88 line codes written by Sigmund (Struct Multidiscip Optim 21(2):120–127, 2001) and Andreassen et al. (Struct Multidiscip Optim 43(1):1–16, 2011). The code solves the problem of minimum compliance while through OAPI it takes advantage of all modelling capabilities of SAP2000. The paper covers the theoretical aspects of topology optimization incorporated in the code and provides detailed description of their numerical implementations. Special effort was made to the latter one, describing in detail all numerical aspects of the code, in order to facilitate the reader to understand the code, and therefore being able to further enhance its capabilities. The complete code can be downloaded from GitHub ( https://github.com/nikoslagaros/TOCP ).

This chapter examines how a system developed using the Structured Systems Analysis and Design Methodology (SSADM) evolves to fit the UML and XML. As a vehicle, the chapter will consider the addition of a new user story to an existing SSADM system. SSADM developed in the early 1980’s. It is still popular. It is similar to other Structured Analysis and Design methods. Evolving SSADM to use the UML and XML is important. This chapter argues that XML is an opportunity, not a problem. It also shows that the earlier UMLs did not support SSADM but the new UML 2.0 does.

The case study described in this chapter concerns the introduction of a new computer based integrated Clinical Information System (CIS) into a British National Health Services Trust-the Sunrise Trust. At the time of the study most of the system modules had been developed and were being tested largely for technical aspects. The system was being introduced during a period when the organization was experiencing significant changes. It was an environment where new structures were being created and the existing ones changed. Indeed, the case study was selected primarily because of these factors. The analysis of these structures, formal and informal, provides insight into the management of information systems. Various stakeholders in the Hospital Trust felt that a computer based information system would facilitate the change process. However the analysis and design of the system posed its own problems. The system turned out to be inflexible with respect to the core health care delivery process. It was also nonresponsive to the needs of the key stakeholders. Analysis of the case shows that clearly the formal methods adopted by the system analysts fell short of determining the rapid changes required for care. In particular this was an important issue, since the context of the British National Health Services posed pressures on individual trusts to be cost effective. This resulted in long term patients being moved out into the community. However, this richness in the context was overlooked by the analysts. They developed “logical” models of the system, which ended up in being “tidy pictures of reality” and were prescriptive and utterly inflexible. Structured Systems Analysis and Design Method (SSADM) was used as a modelling tool, which amplified the rational view of decision making and information technology (IT) applications (for more details on SSADM see Downs et al., 1988). The interpretations identified in the case show a clear mis-match between the formal models and perceptions of the system users who inevitably reflect a more informal and pragmatic approach to their own organizational realities. The analysis of the case poses a number of interesting issues. It questions the relationship between the complexity of the social relations and systems design. Furthermore it brings to the fore the paradoxical viewpoints of different stakeholders and the emergent concerns for a system analyst. The chapter also identifies the impact of an “overformalized” information system on the integrity of an organization. In doing so it evaluates the nature and significance of social power structures in systems analysis, design and implementation.

Results of survey of use of SSADM in commercial and government sectors in United Kingdom

This research work focused on development of a model of web based virtual University Administration for Nigerian universities. This is necessary as there is still a noticeable administrative constraint in our Universities, the establishment of many University Web portals notwithstanding. More efforts are therefore needed to enhance or improve on the software that drives these portals to make them more efficient and render real time services. The model enables members of academic community to set up curriculum, register students and staff, enter exam scores, post news, view results, pay school fees, request for transcripts, obtain vital information from the university and update information on daily basis. The model has a watch-dog monitor called Web Patrol that monitors and keeps a log of the transactions by students and staff. The methodologies adopted for this work are top-down, prototyping and Structured Systems Analysis and Design Methodology (SSADM). This research work helps in bringing university administrative products and services to the door steps of people, thereby reducing administrative bottleneck witnessed in our universities today. It generates results and transcripts, thereby solving the current problems of delay in result and transcript processing and transfer in our universities.

The present internet version which was established and consolidated over internet protocol version 4 (IPV4) in 1981, and whose amount of public addresses available is insufficient to meet the demands explosion and current internet multimedia devices, services and application intensive environment has posed serious problems of incomplete web transactions. Stakeholders and communication industry in Nigeria are unwilling and feel reluctant to migrate to IPV6 because of inhibiting factors. This needs urgent redress to overcome the tractions that are responsible for apathy to migration from IPV4 to IPV6 launched in 1994 by the Internet Engineering Task Force (IETF). If nothing is done, sometime, internet may run out of space, ARIN [1]. Users may suffer disillusionment and frustration. The objective of this study therefore is to design a model for predicting migration from IPV4 to IPV6 in Nigeria by 2027 based on growth trend developed from statistical indices. The essence is to explore and analyze the factors that can encourage migration to IPV6 in the next 10 years and use those factors to forecast growth, so that IPV6 will receive boost in terms of growth and patronage. The study also aims at designing a predictive model that simulates the behaviour of the restrictive policies on migration to 1PV6 so as to ascertain the current impact on non-motivation and unwillingness to migrate to IPV6 in Nigeria. The motivation behind this study is to identify the inhibiting factors responsible for lack of motivation to migrate from IPV4 to IPV6 in Nigeria. The methodologies that were deployed in packaging the model include the statistical methodology, Structured Systems Analysis and Design Methodology (SSADM) and prototyping. The result is indeed functional software, programmed through Visual Basic. Net. (VB.Net) that can be used to simulate the behavioural impact of any government policy formulation for Telecommunication industry and stakeholders.

I worked for a British computer company in the 1990s, and it was company policy to use SSADM (Structured Systems Analysis and Design Method) for any new projects. At the time, we were working on a part of the London Underground (also called the Tube) automation. I went to my manager with the time estimate for a new module that I was designing. The estimate was high, and he asked, “What are all these tasks for gathering requirement specifications and technical system options?” I said those were SSADM-based tasks. He replied: “We can do the documentation later. Right now, get on with the database design and front-end development.” A lot of years later, that attitude has not gone away.

This paper presents a prototype for a structural analysis and design system by using the STEP for the representation and exchange of information on steel structures, by integrating the product model of steel framed structures of AP 230, the geometric and topological information of Part 42, and the detailed Finite Element Analysis information of Part 104 into an unified system. Thus, the STEP-based system makes engineering information more clearable and exchangeable between computer applications than any other conventional methods. This system may be further extended to incorporate such computer applications as detailed engineering and manufacturing information on steel structures.

This study presents a novel hybrid surrogate-assisted optimization framework for finite element (FE) model updating of composite panels. Accurately updated FE models offer a reliable basis for design and analysis of modern structural systems and are widely employed in various industrial and engineering applications. However, model updating of composite structures remains a significant challenge due to their inherent anisotropy and complex mechanical behavior, which often limit the effectiveness of conventional updating techniques. To address these limitations, a hybrid framework is introduced for the first time, combining surrogate modeling with the Slime Mould Algorithm (SMA), a recently developed metaheuristic optimizer. For the proposed model updating strategy, a baseline FE model was initially developed, and an objective function was defined to quantify discrepancies between numerical predictions and experimental measurements. The baseline model generated training data for surrogate models constructed using Response Surface Methodology (RSM), Kriging (KRG), and Artificial Neural Networks (ANN). Among these, the ANN-based surrogates achieved superior predictive accuracy and were selected for the optimization phase. Sensitivity analysis identified the most influential parameters for model updating. Optimization was then carried out to minimize the objective function using the SMA. The resulting ANN–SMA framework substantially reduced discrepancies between experimental and numerical modal responses, yielding a high-fidelity FE model. Comparative assessments against established metaheuristic algorithms, including Particle Swarm Optimization (PSO) and Genetic Algorithm (GA), both integrated with ANN surrogates, revealed that the ANN-SMA framework exhibited enhanced convergence stability and computational efficiency, with reductions in runtime of approximately 7% and 30% relative to ANN-PSO and ANN-GA, respectively. These findings confirm that the proposed ANN–SMA hybrid framework provides a robust, efficient, and reliable tool for precise FE model updating of composite structures, with significant potential for broader applications in structural dynamics and structural health monitoring (SHM).

Wind resistant size optimization of geometrically nonlinear lattice structures using a modified optimality criterion method

Free Vibrations of Composite Shallow Circular Cylindrical Shell Panels Stiffened by A Bonded Non-Central Shell Strip

The chapter offers an overview of the effects of the research advancements in nonlinear dynamics on the evaluation of system safety. The achievements developed over the last 30 years entailed a substantial change of perspective. After recalling the outstanding contributions due to Euler and Koiter, we focus on Thompson’s intuition of global safety. This concept represents a paramount enhancement, full of theoretical and practical implications. Its relevance as a novel paradigm for evaluating the load carrying capacity of a system is highlighted. Making reference to a variety of different case studies, we emphasize that global safety has induced a deep development in the analysis, control, and design of mechanical and structural systems. Recent results are presented, and the possibility to implement effective dedicated control procedures based on global safety concepts is explored. We stress the importance of global safety for valorizing all the potential of the system and guaranteeing superior targets. The very general character of the dynamical integrity approach to design is highlighted.