3-D Model System

The purpose of the 3-D Model System Integrative Project is to recommend an alternative to the 2-D Drawing System. The satellite industry uses 2-D drawings to illustrate the mechanical design of spacecraft hardware. The 3-D Model System Integrative Project analyzes the use of 3-D models to illustrate the spacecraft mechanical architecture. The project compares the currently used 2-D Drawing System against the 3-D Model System. The project begins by defining twelve requirements and performing a trade study analysis. Six mission requirements and six top level requirements are defined. The trade study analyzes how the 3-D Model System and 2-D Drawing System satisfy the six mission requirements. The project showcases the lean principles and quality methods carried out in the 3-D Model System. An assessment of software used and an evaluation of risks associated with the 3-D Model System are performed. A requirements verification plan, ethics review, cost estimation, and lessons learned from similar systems are included in the project analysis. The project analysis concludes that the 3-D Model System exceeds the capabilities of the 2-D Drawing System. The 3-D Model System assists concurrent engineering, provides infinite viewpoints, identifies interference fits and accessibility limitations, reduces costs, and improves quality. The research results imply that satellite system manufactures shall implement the 3-D Model System into their system engineering design process

On Evidence-based Risk Management in Requirements Engineering

Background: The sensitivity of Requirements Engineering (RE) to the context makes it difficult to efficiently control problems therein, thus, hampering an effective risk management devoted to allow for early corrective or even preventive measures. Problem: There is still little empirical knowledge about context-specific RE phenomena which would be necessary for an effective context- sensitive risk management in RE. Goal: We propose and validate an evidence-based approach to assess risks in RE using cross-company data about problems, causes and effects. Research Method: We use survey data from 228 companies and build a probabilistic network that supports the forecast of context-specific RE phenomena. We implement this approach using spreadsheets to support a light-weight risk assessment. Results: Our results from an initial validation in 6 companies strengthen our confidence that the approach increases the awareness for individual risk factors in RE, and the feedback further allows for disseminating our approach into practice.Comment: 20 pages, submitted to 10th Software Quality Days conference, 201

Using software development progress data to understand threats to project outcomes

Peer reviewe

DDG-1000 missile integration: a case study

This thesis is a case study that examines missile development and integration for the DDG-1000 program. In particular, it analyzes various programmatic decisions through the lens of systems engineering standards, articles in scholarly journals, established government acquisition guidelines, and case studies of government and commercial engineering projects. Four risks were identified. First, failure to establish top-level requirements that reflect DDG- 1000 specific needs introduces the potential for the missiles to fail performance or safety evaluations. Second, late requirement changes imposed by the government increase the potential for costly rework and schedule delays if integration issues surface during testing. Third, a use as is decision (meaning that legacy missile requirements were applied to the DDG-1000 missile effort) could result in an inadequate system architecture and/or late identification of system incompatibilities. Finally, organizational and funding issues have hampered the establishment and efficiency of engineering change control and integration management. The thesis recommends: that DOD acquisitions continue to emphasize and enable rigorous application of system engineering early in the acquisitions process; that all programs perform a thorough flow-down of requirements even if utilizing legacy systems; and that all funding for weapon development be placed in the control of the Program Executive Office for Integrated Warfare Systems.http://archive.org/details/ddgmissileintegr1094541425Lieutenant Commander, United States NavyApproved for public release; distribution is unlimited

Maunakea Spectroscopic Explorer Advancing from Conceptual Design

The Maunakea Spectroscopic Explorer (MSE) project has completed its Conceptual Design Phase. This paper is a status report of the MSE project regarding its technical and programmatic progress. The technical status includes its conceptual design and system performance, and highlights findings and recommendations from the System and various subsystems design reviews. The programmatic status includes the project organization and management plan for the Preliminary Design Phase. In addition, this paper provides the latest information related to the permitting process for Maunakea construction.Comment: 15 pages; Proceedings of SPIE Astronomical Telescopes + Instrumentation 2018; Ground-based and Airborne Telescopes VI

Applying tropos to socio-technical system design and runtime configuration

Recent trends in Software Engineering have introduced the importance of reconsidering the traditional idea of software design as a socio-tecnical problem, where human agents are integral part of the system along with hardware and software components. Design and runtime support for Socio-Technical Systems (STSs) requires appropriate modeling techniques and non-traditional infrastructures. Agent-oriented software methodologies are natural solutions to the development of STSs, both humans and technical components are conceptualized and analyzed as part of the same system. In this paper, we illustrate a number of Tropos features that we believe fundamental to support the development and runtime reconfiguration of STSs. Particularly, we focus on two critical design issues: risk analysis and location variability. We show how they are integrated and used into a planning-based approach to support the designer in evaluating and choosing the best design alternative. Finally, we present a generic framework to develop self-reconfigurable STSs