scholarly journals Simulating Systems-of-Systems Dynamic Architectures

Author(s):  
Wallace Alves Esteves Manzano ◽  
Valdemar Vicente Graciano Neto ◽  
Elisa Yumi Nakagawa

Systems-of-Systems (SoS) combine heterogeneous, independent systems to offer complex functionalities for highly dynamic smart applications. Due to their critical nature, SoS should be reliable and work without interruption that could cause serious losses. SoS architectural design can facilitate the prediction of the impact of failures due to SoS behavior. However, existing approaches do not support such evaluation. The main contribution of this paper is to present Dynamic-SoS, an approach to predict, at design time, the SoS architectural behavior at runtime to evaluate whether the SoS can sustain their operation. Results of our multiple case studies reveal Dynamic-SoS is a promising approach that could contribute to the quality of SoS by reliably enabling prior assessment of their dynamic architecture.

Author(s):  
Wallace Manzano ◽  
Valdemar Vicente Graciano Neto ◽  
Elisa Yumi Nakagawa

Systems-of-Systems (SoS) combine heterogeneous, independent systems to offer complex functionalities for highly dynamic smart applications. Due to their critical nature, SoS should be reliable and work without interruption since a failure could cause serious losses. SoS architectural design can facilitate the prediction of the impact of failures due to SoS behavior. However, existing approaches do not support such evaluation. The main contribution of this paper is to present Dynamic-SoS, an approach to predict, at design time, the SoS architectural behavior at runtime to evaluate whether the SoS can sustain their operation. Results of our multiple case studies reveal Dynamic-SoS is a promising approach that could contribute to the quality of SoS by reliably enabling prior assessment of their dynamic architecture.


2019 ◽  
Vol 63 (5) ◽  
pp. 709-731
Author(s):  
Wallace Manzano ◽  
Valdemar Vicente Graciano Neto ◽  
Elisa Yumi Nakagawa

Abstract Systems-of-Systems (SoS) combine heterogeneous, independent systems to offer complex functionalities for highly dynamic smart applications. Besides their dynamic architecture with continuous changes at runtime, SoS should be reliable and work without interrupting their operation and with no failures that could cause accidents or losses. SoS architectural design should facilitate the prediction of the impact of architectural changes and potential failures due to SoS behavior. However, existing approaches do not support such evaluation. Hence, these systems have been usually built without a proper evaluation of their architecture. This article presents Dynamic-SoS, an approach to predict/anticipate at design time the SoS architectural behavior at runtime to evaluate whether the SoS can sustain their operation. The main contributions of this approach comprise: (i) characterization of the dynamic architecture changes via a set of well-defined operators; (ii) a strategy to automatically include a reconfiguration controller for SoS simulation; and (iii) a means to evaluate architectural configurations that an SoS could assume at runtime, assessing their impact on the viability of the SoS operation. Results of our case study reveal Dynamic-SoS is a promising approach that could contribute to the quality of SoS by enabling prior assessment of its dynamic architecture.


Author(s):  
Judith Jeffcoate ◽  
Caroline Chappell ◽  
Sylvie Feindt

This chapter is intended as a contribution to the establishment of a theoretical foundation for the e-commerce field. Our specific contribution to methodology is through the description of a qualitative approach based on multiple case studies across industry and country boundaries. This has enabled us to propose an analytical framework that will identify the triggers for value chain transformation that will encourage SMEs to adopt e-commerce. The chapter describes seven elements that make up this framework, including the automation of value activity interactions between partners in the value chain. These elements form the basis for a discussion of future trends.


2020 ◽  
Vol 13 (4) ◽  
pp. 107-124
Author(s):  
Francisia Seda ◽  
Lugina Setyawati ◽  
Yosef Hilarius Timu Pera ◽  
Muhammad R. Damm ◽  
Kevin Nobel

2020 ◽  
pp. 136216882096177
Author(s):  
Michael Yeldham

Instruction in second language (L2) English phoneme pronunciation almost invariably includes a focus on improving the learners’ use of their articulatory organs to pronounce the relevant sounds. However, the pronunciation of many English sounds also relies on effort from the abdominal region, and under-utilization of this region can often contribute to pronunciation difficulties. For Chinese-speaking learners of English, such relevant sounds include the long vowel and diphthong sounds, particularly the phonemes /iː/, /uː/ and /eɪ/, and also the voiced fricative consonants, /z/, /ð/, /v/ and /ʒ/. Consequently, this study examined the impact of teaching adult Chinese-speaking English learners to enhance the use of their abdomen when pronouncing these sounds. The main focus of the research was a quasi-experimental component, where both an experimental and control group were taught the same way in all aspects, with the only point of difference being that the experimental group was taught the abdominal techniques. Longitudinal multiple-case studies of learners from the experimental group were also employed to examine for any post-course maintenance of the phonemes as well as possible reasons for this. Results from the quasi-experimental component showed that it was advantageous to teach learners the abdominal techniques. Also, there were some discernible trends in the learners’ post-course maintenance of the sounds. This article then discusses pedagogical implications of the study, and provides suggestions for future research of the abdominal techniques.


2021 ◽  
Vol 13 (9) ◽  
pp. 4632
Author(s):  
Varun Gupta ◽  
Luis Rubalcaba

Context: The coronavirus disease 2019 (COVID-19) pandemic led to a turbulent business environment, resulting in market uncertainties, frustrations, and rumors. Wrongly held beliefs—or myths—can hinder startups from turning new market opportunities into their favor (for example, by failing at diversification decisions) or undertaking wrong business decisions, e.g., diversifying in industries that have products of no real market value). Objectives: The objective of the paper is to identify the beliefs that drive the business decisions of startups in a pandemic and to isolate those beliefs that are merely myths. Further, this paper proposes strategic guidelines in the form of a framework to help startups make sound decisions that can lead to market success. Method: The two-step research method involved multiple case studies with five startups based in India, France, Italy, and Switzerland, to identify perceptual beliefs that drove strategic business decisions, followed by a case study of 36 COVID-19-solution focused startups, funded by the European Union (EU). The findings were validated through a survey that involved 102 entrepreneurs. The comparative analysis of two multiple case studies helped identify beliefs that were merely “myths”; myths that drove irrational strategic decisions, resulting in business failures. Results: The results indicate that startups make decisions in pandemic situations that are driven by seven myths, pertaining to human, intellectual, and financial resources. The decision on whether to diversify or continue in the same business operation can be divided into four strategic options of the Competency-Industry Relatedness (C-IR) framework: ignore, delay, phase-in, and diversify. Diversification in the same (or different industry) is less risky for startups if they have the skills, as needed, to diversify in related industries. Diversification in related industries helps startups leverage their experiences and learning curves (those associated with existing product lines) to adapt their existing products in new markets, or utilize their technologies to solve new problems via new products. The desired outcome for these startups should be sustainable business growth—to meet sustainability goals by contributing to the society and the economy. Conclusion: The C-IR framework is a strategic guide for startups to make business decisions based on internal factors, rather than myths. Accurately assessing skill diversity and the nature of new industries (or markets) will help startups leverage their existing resources optimally, without the need for (pricey) external funding. This will foster sustained business growth resulting in a nation economic development. Knowledge transfer from the Innovation ecosystem will further strengthen the C-IR framework effectiveness.


Author(s):  
Tom Yoon ◽  
Bong-Keun Jeong

Using a multiple case studies and surveys, this article finds that factors essential to successful Service Oriented Architecture (SOA) implementations include establishing effective SOA governance, establishing SOA registries, starting with a small project, collaboration between business and IT units, strengthening trust among business units, and training. This article also explores business and IT motivations for SOA implementation and the benefits realized from this implementation. The findings from this article can provide a guidance for practitioners on the successful implementation of SOA.


2021 ◽  
Author(s):  
Huseyin Unlu ◽  
Ali Gorkem Yalcin ◽  
Dilek Ozturk ◽  
Guliz Akkaya ◽  
Mert Kalecik ◽  
...  

2017 ◽  
Vol 06 (02) ◽  
pp. 1740005 ◽  
Author(s):  
Y. Shoji ◽  
H. Fuke ◽  
K. Hamada ◽  
I. Iijima ◽  
C. Ikeda ◽  
...  

Stratospheric balloons have been used worldwide for more than half a century for various scientific missions. However such balloon operations are facing safety issues due to the reduction in appropriate sites for landing. Instead of landing on the ground, landing and recovering on the sea can be a radical solution to this problem. Marine search-and-recovery operations for balloons are not conducted commonly; however, such the operation has been uniquely developed in Japan for more than 40 years. This study describes the methodology for such search-and-recovery of balloons and gondolas through examination of multiple case studies.


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