Sensor network web services have recently emerged as promising tools to provide remote management, data collection and querying capabilities for sensor networks. They can be utilized in a large number of elds among which Demand-Side Energy Management (DSEM) is an important application area that has become possible with the smart electrical power grid. DSEM applications generally aim to reduce the cost and the amount of power consumption. In the traditional power grid, DSEM has not been implemented widely due to the large number of households and lack of ne-grained automation tools. However by employing intelligent devices and implementing communication infrastructure among these devices, the smart grid will renovate the existing power grid and it will enable a wide variety of DSEM applications. In this thesis, we analyze various DSEM scenarios that become available with sensor network web services. We assume a smart home with a Wireless Sensor Network (WSN) where the sensors are mounted on the appliances and they are able to run web services. The web server retrieves data from the appliances via the web services running on the sensor nodes. These data can be stored in a database after processing, where the database can be accessed by the utility, as well as the inhabitants of the smart home. We showthat our implementation is e cient in terms of running time. Moreover, the message sizes and the implementation code is quite small which makes it suitable for the memory-limited sensor nodes. Furthermore, we show the application scenarios introduced in the thesis provide energy saving for the smart home.

Smart grid is an emerging technology that aims to empower the current power grid with the integration of two-way communication and computer technology. This thesis deals with energy management in smart grid with focus on the smart home and the Intelligent Transportation System (ITS). The smart home contains a network that connects home elements like smart appliances, HVAC (heating, ventilation, and air conditioning), thermostat, smart meter, sensors, solar panels and energy storage. ITS integrates computer and communication technologies for advanced traffic management and communication among road infrastructure, vehicles and users. A web service describes a collection of operations that are accessible via the Internet. Web services can also provide security and interoperability. Due to the rising cost of energy, more and more residential consumers are interested in controlling temperature or appliances in order to reduce energy consumption. In this thesis, we propose an approach that uses Web services to remotely and efficiently interact with smart home devices in order to manage energy consumption, in a smart grid environment. Consequently, the user is able to adjust the temperature, control appliances or read energy consumption values quickly, remotely and securely. A smart home with a wireless network based on ZigBee and XMPP (eXtensible Messaging and Presence Protocol) is simulated. The advantage of XMPP is that it provides near real-time communication and security. There is a central computer that can communicate with all home elements. Business Process Execution Language (BPEL) is used to implement the Web service on a central computer. Furthermore, quality of service is offered. Therefore, different levels of security and an access control mechanism are provided. An algorithm is proposed that can sell stored energy back to the grid from smart home. Another algorithm is proposed that can facilitate demand response. Moreover, dynamic programming is used to minimize energy consumption. Also, a broadcasting algorithm is presented that can be used by an electric vehicle to find the most suitable charging station in ITS. Simulation and analytical study is undertaken to demonstrate the performance and advantage of the proposed approach and algorithms.

The primary objective of this work is to investigate the potential of utilizing Hadoop and Amazon Redshift in the Amazon Web Services ("AWS") cloud, in order to design and implement a data warehouse, the efficacy of which will be tested afterwards. Contributions of this work include: documenting the technologies in the AWS cloud in Czech, demonstration of the design and performance tests of the data warehouse and the ETL part. Another considerable benefit is the added value to the company for whom the project was designed, and which is currently using the output of the project.

Web services are increasingly used to integrate heterogeneous and autonomous applications in cross-organizational cooperations. A key problem is to support a high execution quality of complex cooperative processes, e.g. in e-business or health care. One important aspect that has received little attention so far is the dynamic handling of exceptions during process execution. To address this problem, we propose a rule-based approach to automatically control and enforce quality constraints for web-service-based cooperative processes.

Der zunehmende Einsatz von Web-Technologien steigert die Notwendigkeit, kooperative Geschäftsprozesse und Workflows zwischen verschiedenen Unternehmen oder Abteilungen webbasiert abzuwickeln. Eine treibende Kraft hierfür ist die wachsende Verfügbarkeit von Web-Service-Realisierungen zur Interoperabilität. Die derzeit verfügbaren Ansätze unterstützen jedoch keine ausreichende Qualität und Flexibilität kooperativer webbasierter Workflows, insbesondere bzgl. der Ausführungsqualität von Diensten und der dynamischen Ausnahmebehandlung. Diese Defizite sollen mit dem System WEBFLOW abgebaut werden. Es ermöglicht die Definition und Überwachung von Ausführungsbedingungen für unterschiedlich mächtige Dienste verschiedener Kooperationspartner. Zudem unterstützt es eine regelbasierte dynamische Ausnahmebehandlung, mit der die Robustheit kooperativer Workflows deutlich verbessert werden soll.

The goal of this research is to make it easier to design and create web services for relational databases. A web service is a software service for providing data over computer networks. Web services provide data endpoints for many web applications. We adopt a plug-and-play approach for web service creation whereby a designer constructs a “plug,” which is a simple specification of the output produced by the service. If the plug can be “played” on the database then the web service is generated. Our plug-and-play approach has three advantages. First, a plug is portable. You can take the plug to any data source and generate a web service. Second, a plug-and-play service is more reliable. The web service generation checks the database to determine if the service can be safely and correctly generated. Third, plug-and-play web services are easier to code for complex data since a service designer can write a simple plug, abstracting away the data’s real complexity. We describe how to build a system for plug-and-play web services, and experimentally evaluate the system. The software produced by this research will make life easier for web service designers.

Mobile device technology with the influence of the Internet is creating a lot of Webbased services so that people can have easy and 24-hour access to the services. Recently, the Google’s Android has revolutionized applications development for the mobile platform. As there is an increasing number of companies exposing their services as Web services, enabling flexible mobile access to distributed Web resources is a relevant challenge. However, the current Web is a collection of human readable pages that are unintelligible to computer programs. Semantic Web and Web services have the potential of overcoming this limitation. For this, a standard ontology called Ontology Web Language for Services (OWL-S) is employed. The vision is to automatically discover services like Sensor Web services from mobile. In this thesis, a mobile framework is developed for the automatic discovery of services. The application is implemented for the Coastal Sensor Web and the Semantic Web service.

No description available.

No description available.

Idag går utvecklingen mot alltmer distribuerade IT-system där en grupp datorer kommunicerar med varandra. Detta gäller för sökmotorer, beräkningsintensiva miljöer och även för den svenska försvarsmaktens ledningssystem. För att systemen ska kunna kommunicera så flexibelt som möjligt vill man ofta att kommunikationen ska ske enligt standardiserade protokoll vilka är oberoende av datorplattform, programmeringsspråk och transportprotokoll. Ett koncept som kan användas för denna sorts kommunikation är Web Services vilket är ett koncept där meddelanden skickas XML-formaterade över valfritt kommunikationsprotokoll. För att möjliggöra utbyte av känsligt data som inte får nås av obehöriga måste kommunikationen stöttas av ett flertal viktiga säkerhetsfunktioner. En av dessa funktioner är användarautentisering vilket innebär att användarens identitet kan verifieras. För att möjliggöra användarautentisering kan digitala certifikat och asymmetriska kryptooperationer användas, denna typ av operationer är prestandakrävande varför ”Single Sign On” eftersträvas. SSO innebär att användaren endast autentiserar sig en gång under ett visst tidsintervall för att underlätta för både system och användare. När användarautentiseringen är genomförd kan en symmetrisk nyckel utbytas för fortsatt kommunikation. Den fortsatta kommunikationen kan skyddas på olika nivåer såsom transportnivå och meddelandenivå. Författaren av detta examensarbete har undersökt och implementerat en lösning för användarautentisering och meddelandeskydd för Web Services. Dessutom utreds några verktyg som finns tillgängliga för Web Services idag och några som förväntas komma inom kort. / Today, the technical development goes towards distributed computer systems where a group of computers communicate with each other. This applies for search engines, calculation intensive environments and also for the Swedish defence management systems. In order for the systems to communicate as flexible as possible one often wants the communication to take place according to standardized protocols which are independently of computer platform, programming language and transport protocol. A concept that can be used for this type of communication is Web Services which is a concept where information is sent as XML formatted messages over optional communication protocol. In order to make it possible to exchange sensitive data that must be out of reach of unauthorized use, the communication must be supported of several important security functions. One of these functions is user authentication which incorporates that the member's identity is verified. In order to make user authentication possible, digital certificates and asymmetric crypto operations may be used. These types of operations are performance requiring why Single Sign On is sought. SSO means that the member only authenticates itself once during a certain time interval in order to facilitate for both systems and members. When the user authentication is completed a symmetric key can be exchanged for continued communication. The continued communication can be protected on various levels such as transport level and message level. The author of this master thesis has examined and implemented a solution for user authentication and message protection for Web Services. Moreover, different existing tools are investigated that are available for Web service's today and some that are expected to come shortly.