Communications in Choreographies, Revisited

Choreographic Programming is a paradigm for developing correct-by-construction concurrent programs, by writing high-level descriptions of the desired communications and then synthesising process implementations automatically. So far, choreographic programming has been explored in the monadic setting: interaction terms express point-to-point communications of a single value. However, real-world systems often rely on interactions of polyadic nature, where multiple values are communicated among two or more parties, like multicast, scatter-gather, and atomic exchanges. We introduce a new model for choreographic programming equipped with a primitive for grouped interactions that subsumes all the above scenarios. Intuitively, grouped interactions can be thought of as being carried out as one single interaction. In practice, they are implemented by processes that carry them out in a concurrent fashion. After formalising the intuitive semantics of grouped interactions, we prove that choreographic programs and their implementations are correct and deadlock-free by construction

Immersive Participation:Futuring, Training Simulation and Dance and Virtual Reality

Dance knowledge can inform the development of scenario design in immersive digital simulation environments by strengthening a participant’s capacity to learn through the body. This study engages with processes of participatory practice that question how the transmission and transfer of dance knowledge/embodied knowledge in immersive digital environments is activated and applied in new contexts. These questions are relevant in both arts and industry and have the potential to add value and knowledge through crossdisciplinary collaboration and exchange. This thesis consists of three different research projects all focused on observation, participation, and interviews with experts on embodiment in digital simulation. The projects were chosen to provide a range of perspectives across dance, industry and futures studies. Theories of embodied cognition, in particular the notions of the extended body, distributed cognition, enactment and mindfulness, offer critical lenses through which to explore the relationship of embodied integration and participation within immersive digital environments. These areas of inquiry lead to the consideration of how language from the field of computer science can assist in describing somatic experience in digital worlds through a discussion of the emerging concepts of mindfulness, wayfinding, guided movement and digital kinship. These terms serve as an example of how the mutability of language became part of the process as terms applied in disparate disciplines were understood within varying contexts. The analytic tools focus on applying a posthuman view, speculation through a futures ethnography, and a cognitive ethnographical approach to my research project. These approaches allowed me to examine an ecology of practices in order to identify methods and processes that can facilitate the transmission and transfer of embodied knowledge within a community of practice. The ecological components include dance, healthcare, transport, education and human/computer interaction. These fields drove the data collection from a range of sources including academic papers, texts, specialists’ reports, scientific papers, interviews and conversations with experts and artists.The aim of my research is to contribute both a theoretical and a speculative understanding of processes, as well as tools applicable in the transmission of embodied knowledge in virtual dance and arts environments as well as digital simulation across industry. Processes were understood theoretically through established studies in embodied cognition applied to workbased training, reinterpreted through my own movement study. Futures methodologies paved the way for speculative processes and analysis. Tools to choreograph scenario design in immersive digital environments were identified through the recognition of cross purpose language such as mindfulness, wayfinding, guided movement and digital kinship. Put together, the major contribution of this research is a greater understanding of the value of dance knowledge applied to simulation developed through theoretical and transformational processes and creative tools

IoT Security Vulnerabilities and Predictive Signal Jamming Attack Analysis in LoRaWAN

Internet of Things (IoT) gains popularity in recent times due to its flexibility, usability, diverse applicability and ease of deployment. However, the issues related to security is less explored. The IoT devices are light weight in nature and have low computation power, low battery life and low memory. As incorporating security features are resource expensive, IoT devices are often found to be less protected and in recent times, more IoT devices have been routinely attacked due to high profile security flaws. This paper aims to explore the security vulnerabilities of IoT devices particularly that use Low Power Wide Area Networks (LPWANs). In this work, LoRaWAN based IoT security vulnerabilities are scrutinised and loopholes are identified. An attack was designed and simulated with the use of a predictive model of the device data generation. The paper demonstrated that by predicting the data generation model, jamming attack can be carried out to block devices from sending data successfully. This research will aid in the continual development of any necessary countermeasures and mitigations for LoRaWAN and LPWAN functionality of IoT networks in general

Journey of Artificial Intelligence Frontier: A Comprehensive Overview

The field of Artificial Intelligence AI is a transformational force with limitless promise in the age of fast technological growth This paper sets out on a thorough tour through the frontiers of AI providing a detailed understanding of its complex environment Starting with a historical context followed by the development of AI seeing its beginnings and growth On this journey fundamental ideas are explored looking at things like Machine Learning Neural Networks and Natural Language Processing Taking center stage are ethical issues and societal repercussions emphasising the significance of responsible AI application This voyage comes to a close by looking ahead to AI s potential for human-AI collaboration ground-breaking discoveries and the difficult obstacles that lie ahead This provides with a well-informed view on AI s past present and the unexplored regions it promises to explore by thoroughly navigating this terrai

Multiparty Languages: The Choreographic and Multitier Cases (Pearl)

Choreographic languages aim to express multiparty communication protocols, by providing primitives that make interaction manifest. Multitier languages enable programming computation that spans across several tiers of a distributed system, by supporting primitives that allow computation to change the location of execution. Rooted into different theoretical underpinnings - respectively process calculi and lambda calculus - the two paradigms have been investigated independently by different research communities with little or no contact. As a result, the link between the two paradigms has remained hidden for long. In this paper, we show that choreographic languages and multitier languages are surprisingly similar. We substantiate our claim by isolating the core abstractions that differentiate the two approaches and by providing algorithms that translate one into the other in a straightforward way. We believe that this work paves the way for joint research and cross-fertilisation among the two communities

Now It Compiles! Certified Automatic Repair of Uncompilable Protocols

Choreographic programming is a paradigm where developers write the global specification (called choreography) of a communicating system, and then a correct-by-construction distributed implementation is compiled automatically. Unfortunately, it is possible to write choreographies that cannot be compiled, because of issues related to an agreement property known as knowledge of choice. This forces programmers to reason manually about implementation details that may be orthogonal to the protocol that they are writing. Amendment is an automatic procedure for repairing uncompilable choreographies. We present a formalisation of amendment from the literature, built upon an existing formalisation of choreographic programming. However, in the process of formalising the expected properties of this procedure, we discovered a subtle counterexample that invalidates the original published and peer-reviewed pen-and-paper theory. We discuss how using a theorem prover led us to both finding the issue, and stating and proving a correct formulation of the properties of amendment

Functional Choreographic Programming

Choreographic programming is an emerging programming paradigm for concurrent and distributed systems, whereby developers write the communications that should be enacted and then a distributed implementation is automatically obtained by means of a compiler. Theories of choreographic programming typically come with strong theoretical guarantees about the compilation process, most notably: the generated implementations operationally correspond to their source choreographies and are deadlock-free. Currently, the most advanced incarnation of the paradigm is Choral, an object-oriented choreographic programming language that targets Java. Choral deviated significantly from known theories of choreographies, and introduced the possibility of expressing higher-order choreographies (choreographies parameterised over choreographies) that are fully distributed. As a consequence, it is unclear if the usual guarantees of choreographies can still hold in the more general setting of higher-order ones. We introduce Chor{\lambda}, the first functional choreographic programming language: it introduces a new formulation of the standard communication primitive found in choreographies as a function, and it is based upon the {\lambda}-calculus. Chor{\lambda} is the first theory that explains the core ideas of higher-order choreographic programming (as in Choral). Bridging the gap between practice and theory requires developing a new evaluation strategy and typing discipline for {\lambda} terms that accounts for the distributed nature of computation in choreographies. We illustrate the expressivity of Chor{\lambda} with a series of examples, which include reconstructions of the key examples from the original presentation of Choral. Our theory supports the expected properties of choreographic programming and bridges the gap between the communities of functional and choreographic programming

Choral: Object-Oriented Choreographic Programming

We present Choral, the first choreographic programming language based on mainstream abstractions. The key idea in Choral is a new notion of data type, which allows for expressing that data is distributed over different roles. We use this idea to reconstruct the paradigm of choreographic programming through object-oriented abstractions. Choreographies are classes, and instances of choreographies are objects with states and behaviours implemented collaboratively by roles. Choral comes with a compiler that, given a choreography, generates an implementation for each of its roles. These implementations are libraries in pure Java, whose types are under the control of the Choral programmer. Developers can then modularly compose these libraries in their own programs, in order to participate correctly in choreographies. Choral is the first incarnation of choreographic programming offering such modularity, which finally connects more than a decade of research on the paradigm to practical software development. The integration of choreographic and object-oriented programming yields other powerful advantages, where the features of one paradigm benefit the other in ways that go beyond the sum of the parts. The high-level abstractions and static checks from the world of choreographies can be used to write concurrent and distributed object-oriented software more concisely and correctly. We obtain a much more expressive choreographic language from object-oriented abstractions than in previous work. For example, object passing makes Choral the first higher-order choreographic programming language, whereby choreographies can be parameterised over other choreographies without any need for central coordination. Together with subtyping and generics, this allows Choral to elegantly support user-defined communication mechanisms and middleware

Developing tools and evidence to deliver prosperity: optimising for prosperity with a meta-framework for change

Change is persistent, and provisioning for prosperity in this complex dynamic world is not a simple task. Sustaining the conditions which enable certain prosperities can come at the expense of others whilst undermining the biophysical foundations required for all. In this paper I explore the tension between this need for sustainment and the inevitability of change by examining several conceptualisations and formalised frameworks for change which range from the holistic to the mechanistic. I find that both prosperity and resilience in human systems are contingent on the skilful nurturing of the novelty emergent from the great diversity of knowledges at our collective disposal. With this assertion in hand, I attempt to design and assemble a meta-framework for change that can describe our dynamic world and gesture it towards a future of equitably co-existing prosperities through a craft of emergence. Following this and a hypothetical example of the meta-framework in action, I conclude that it can indeed be a useful tool provided it can bare the weight of further scrutiny and integration with other approaches