This paper provides an overview of the Internet of Things (IoT) with emphasis on enabling technologies, protocols, and application issues. The IoT is enabled by the latest developments in RFID, smart sensors, communication technologies, and Internet protocols. The basic premise is to have smart sensors collaborate directly without human involvement to deliver a new class of applications. The current revolution in Internet, mobile, and machine-to-machine (M2M) technologies can be seen as the first phase of the IoT. In the coming years, the IoT is expected to bridge diverse technologies to enable new applications by connecting physical objects together in support of intelligent decision making. This paper starts by providing a horizontal overview of the IoT. Then, we give an overview of some technical details that pertain to the IoT enabling technologies, protocols, and applications. Compared to other survey papers in the field, our objective is to provide a more thorough summary of the most relevant protocols and application issues to enable researchers and application developers to get up to speed quickly on how the different protocols fit together to deliver desired functionalities without having to go through RFCs and the standards specifications. We also provide an overview of some of the key IoT challenges presented in the recent literature and provide a summary of related research work. Moreover, we explore the relation between the IoT and other emerging technologies including big data analytics and cloud and fog computing. We also present the need for better horizontal integration among IoT services. Finally, we present detailed service use-cases to illustrate how the different protocols presented in the paper fit together to deliver desired IoT services.

Internet of Things: A Survey on Enabling Technologies, Protocols, and Applications

物件導向軟體之架構(Object-Oriented Software Construction)探討

As we are moving towards the Internet of Things (IoT), the number of sensors deployed around the world is growing at a rapid pace. Market research has shown a significant growth of sensor deployments over the past decade and has predicted a significant increment of the growth rate in the future. These sensors continuously generate enormous amounts of data. However, in order to add value to raw sensor data we need to understand it. Collection, modelling, reasoning, and distribution of context in relation to sensor data plays critical role in this challenge. Context-aware computing has proven to be successful in understanding sensor data. In this paper, we survey context awareness from an IoT perspective. We present the necessary background by introducing the IoT paradigm and context-aware fundamentals at the beginning. Then we provide an in-depth analysis of context life cycle. We evaluate a subset of projects (50) which represent the majority of research and commercial solutions proposed in the field of context-aware computing conducted over the last decade (2001-2011) based on our own taxonomy. Finally, based on our evaluation, we highlight the lessons to be learnt from the past and some possible directions for future research. The survey addresses a broad range of techniques, methods, models, functionalities, systems, applications, and middleware solutions related to context awareness and IoT. Our goal is not only to analyse, compare and consolidate past research work but also to appreciate their findings and discuss their applicability towards the IoT.

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Context Aware Computing for The Internet of Things: A Survey

This paper discusses the concept of Cloud Computing to achieve a complete definition of what a Cloud is, using the main characteristics typically associated with this paradigm in the literature. More than 20 definitions have been studied allowing for the extraction of a consensus definition as well as a minimum definition containing the essential characteristics. This paper pays much attention to the Grid paradigm, as it is often confused with Cloud technologies. We also describe the relationships and distinctions between the Grid and Cloud approaches.

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A break in the clouds: towards a cloud definition

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A Break in the Clouds: Towards a Cloud Definition

Mobile computing devices, such as personal digital assistants and mobile phones, are becoming increasingly popular, smaller, and more capable. We argue that mobile systems should be able to adapt to changing requirements and execution environments. Adaptation requires the ability-to reconfigure the deployed code base on a mobile device. Such reconfiguration is considerably simplified if mobile applications are component-oriented rather than monolithic blocks of code. We present the SATIN (system adaptation targeting integrated networks) component metamodel, a lightweight local component metamodel that offers the flexible use of logical mobility primitives to reconfigure the software system by dynamically transferring code. The metamodel is implemented in the SATIN middleware system, a component-based mobile computing middleware that uses the mobility primitives defined in the metamodel to reconfigure both itself and applications that it hosts. We demonstrate the suitability of SATIN in terms of lightweightedness, flexibility, and reusability for the creation of adaptable mobile systems by using it to implement, port, and evaluate a number of existing and new applications, including an active network platform developed for satellite communication at the European space agency. These applications exhibit different aspects of adaptation and demonstrate the flexibility of the approach and the advantages gained

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The SATIN Component System-A Metamodel for Engineering Adaptable Mobile Systems

Summary form only given. We survey seminal work on software architecture evaluation methods. We then look at an emerging class of methods that explicates evaluating software architectures for stability and evolution. We define architectural stability and formulate the problem of evaluating software architectures for stability and evolution. We draw attention to the use of Architectures Description Languages (ADLs) for supporting the evaluation of software architectures in general and for architectural stability specifically.

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Evaluating software architectures: development, stability, and evolution

Summary form only given. Middleware solutions for wired distributed systems cannot be used in a mobile setting, as mobile applications impose new requirements that run counter to the principle of transparency on which current middleware systems have been built. We propose the use of reflection capabilities and meta-data to pave the way for a new generation of middleware platforms designed to support mobility.

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Middleware for mobile computing: awareness vs. transparency

For the majority of front-end e-business systems, the assumption of a coherent and homogeneous set of interfaces is highly unrealistic. Problems start in the back-end, with systems characterised by heterogeneous mix of applications and business processes. Integration can be complex and expensive, as systems evolve more in accordance with business needs then with technical architectures. E-business systems are faced with the challenge to give a coherent image of a diversified reality. Web Services make business interfaces more efficient, but effectiveness is a business requirement of at least comparable importance.In this paper, we propose a technique for automatic reconciliation of the Web Service interfaces involved in inter-organisational business processes. The working assumption is that the Web Service front-end of each company, is represented by a set of WSDL and WSCL interfaces. The result of our reconciliation method is a common interface that all the parties can effectively enforce. Indications are also given on ways to adapt individual interfaces to the common one. The technique was embodied in a prototype that we also present.

Web service interfaces for inter-organisational business processes an infrastructure for automated reconciliation

The behaviour of a distributed system is largely determined by the use of synchronization primitives and threading policies of the underlying middleware. The inherent parallel nature of distributed systems may cause liveness problems, such as deadlocks and livelocks. An increasing number of distributed systems is built using object middleware. We exploit the fact that modern object middleware offers only a few built-in synchronization and threading primitives by suggesting UML stereotypes to represent each of these primitives in distributed object design. We define the semantics of the stereotypes using a process algebra. We use that semantics to translate UML diagrams into behaviourally equivalent process algebra representations and can then use model checking techniques to find potential deadlocks. The paper also shows how the model checking results can be related back to the original UML diagrams.

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Wolfgang Emmerich

Papers

The SATIN Component System-A Metamodel for Engineering Adaptable Mobile Systems

Evaluating software architectures: development, stability, and evolution

Middleware for mobile computing: awareness vs. transparency

Web service interfaces for inter-organisational business processes an infrastructure for automated reconciliation

Deadlock detection in distributed object systems