An Application Framework for Loosely Coupled Networked Cyber-Physical Systems

Gehani

Proceedings of the 28th Annual ACM Symposium on Applied Computing

et al. 2013

Self Cite

Emerging applications such as search-and-rescue operations, CNS (communication, navigation, surveillance), smart spaces, vehicular networks, mission-critical infrastructure, and disaster control require reliable content distribution under harsh network conditions and all kinds of component failures. In such scenarios, potentially heterogeneous networked components -where the networks lack reliable connectionsneed to be managed to improve scalability, performance, and availability of the overall system. Inspired by delayand disruption-tolerant networking, this paper presents a distributed cross-layer monitoring and optimization method for secure content delivery as a first step toward decentralized content-based mobile ad hoc networking. In particular, we address the availability maximization problem by embedding monitoring and optimization within an existing content-distribution framework. The implications of policies at security, caching, and hardware layers that control in-network storage and hop-by-hop dissemination of content then are analyzed to maximize the content availability in disruptive environments. Additional benefits can be obtained by optimizing the control based on continuously observing the response to anomalies caused by cyber-attacks. For example, if excessive (potentially fraudulent) content is injected, the content distribution system can adapt without significantly compromising the availability.

Section: Discussionmentioning

confidence: 99%

Maximizing availability of content in disruptive environments by cross-layer optimization

Gehani

Proceedings of the 28th Annual ACM Symposium on Applied Computing

et al. 2013

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Lecture Notes in Computer Science

“…Another caching strategy inspired by our earlier work [23] is order-based replacement. While the concept is very general, the most common use is to keep only the freshest piece of content, while staler content is discarded from the data store.…”

Section: Content-and Utility-based Cachingmentioning

confidence: 99%

ICEMAN: A Practical Architecture for Situational Awareness at the Network Edge

Wood

Mathewson

Joy

et al. 2015

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Abstract. Situational awareness applications used in disaster response and tactical scenarios require efficient communication without support from a fixed infrastructure. As commercial off-the-shelf mobile phones and tablets become cheaper, they are increasingly deployed in volatile ad-hoc environments. Despite wide use, networking in an efficient and distributed way remains as an active research area, and few implementation results on mobile devices exist. In these scenarios, where users both produce and consume sensed content, the network should efficiently match content to user interests without making any fixed infrastructure assumptions. We propose the ICEMAN (Information CEntric Mobile Adhoc Networking) architecture which is designed to support distributed situational awareness applications in tactical scenarios. We describe the motivation, features, and implementation of our architecture and briefly summarize the performance of this novel architecture. and UCSC in the scope of the DARPA Disruption-Tolerant Networking (DTN) Program, which also funded a subsequent collaboration between SRI and PARC Palo Alto Research Center. The underlying idea that delay-/disruption-tolerant and content-based networking should be treated on an equal footing was already advocated by our team, especially J.J. Garcia-Luna-Aceves, at that time, but in our view not satisfactorily realized until now. From a theoretical perspective, we are concerned with an extreme and hence interesting case of a loosely coupled distributed system that requires new decentralized approaches to content-access, dissemination, reliability, and security. Hence, the ENCODERS project also benefits from a good amount of theoretical research that is mostly hidden from the user. In addition to network coding and attribute-based encryption, it implements a version of the partially-ordered knowledge sharing model at the content level that we already used as the basis of our DTN

Proceedings of the 2015 European Conference on Software Architecture Workshops

“…Kim et al [113] propose an application framework for loosely coupled networked CPS. A key point of interest of this approach is the knowledge handling between multiple distributed nodes.…”

Section: Framework With Special Focusmentioning

confidence: 99%

“…Furthermore, patterns highlight to advantages and known issues by applying it, which facilitates design decisions during the development and might lead to a better system respectively software design. Choi et al [59] introduce application patterns of the beforehand mentioned cyber framework from Kim et al [113]. The patterns focus on the handling and distribution of the common, unified knowledge base of the underlying distributed networked CPS.…”

Section: Patterns For Adaptive Systemsmentioning

confidence: 99%

Modeling Collaborations in Adaptive Systems of Systems

Wätzoldt

Giese

2015

Recently, due to an increasing demand on functionality and flexibility, beforehand isolated systems have become interconnected to gain powerful adaptive System of Systems (SoS) solutions with an overall robust, flexible and emergent behavior. The adaptive SoS comprises a variety of different system types ranging from small embedded to adaptive cyber-physical systems. On the one hand, each system is independent, follows a local strategy and optimizes its behavior to reach its goals. On the other hand, systems must cooperate with each other to enrich the overall functionality to jointly perform on the SoS level reaching global goals, which cannot be satisfied by one system alone. Due to difficulties of local and global behavior optimizations conflicts may arise between systems that have to be solved by the adaptive SoS.This thesis proposes a modeling language that facilitates the description of an adaptive SoS by considering the adaptation capabilities in form of feedback loops as first class entities. Moreover, this thesis adopts the Models@runtime approach to integrate the available knowledge in the systems as runtime models into the modeled adaptation logic. Furthermore, the modeling language focuses on the description of system interactions within the adaptive SoS to reason about individual system functionality and how it emerges via collaborations to an overall joint SoS behavior. Therefore, the modeling language approach enables the specification of local adaptive system behavior, the integration of knowledge in form of runtime models and the joint interactions via collaboration to place the available adaptive behavior in an overall layered, adaptive SoS architecture.Beside the modeling language, this thesis proposes analysis rules to investigate the modeled adaptive SoS, which enables the detection of architectural patterns as well as design flaws and pinpoints to possible system threats. Moreover, a simulation framework is presented, which allows the direct execution of the modeled SoS architecture. Therefore, the analysis rules and the simulation framework can be used to verify the interplay between systems as well as the modeled adaptation effects within the SoS. This thesis realizes the proposed concepts of the modeling language by mapping them to a state of the art standard from the automotive domain and thus, showing their applicability to actual systems. Finally, the modeling language approach is evaluated by remodeling up to date research scenarios from different domains, which demonstrates that the modeling language concepts are powerful enough to cope with a broad range of existing research problems.-I - Zusammenfassung