An open platform for rapid-prototyping protection and control schemes with IEC 61850

Communications is becoming increasingly important to the operation of protection and control schemes. Although offering many benefits, using standards-based communications, particularly IEC 61850, in the course of the research and development of novel schemes can be complex. This paper describes an open-source platform which enables the rapid prototyping of communications-enhanced schemes. The platform automatically generates the data model and communications code required for an intelligent electronic device to implement a publisher-subscriber generic object-oriented substation event and sampled-value messaging. The generated code is tailored to a particular system configuration description (SCD) file, and is therefore extremely efficient at runtime. It is shown here how a model-centric tool, such as the open-source Eclipse Modeling Framework, can be used to manage the complexity of the IEC 61850 standard, by providing a framework for validating SCD files and by automating parts of the code generation process. The flexibility and convenience of the platform are demonstrated through a prototype of a real-time, fast-acting load-shedding scheme for a low-voltage microgrid network. The platform is the first open-source implementation of IEC 61850 which is suitable for real-time applications, such as protection, and is therefore readily available for research and education

On the conditions for efficient interoperability with threads: An experience with PGAS languages using Cray communication domains

Today's high performance systems are typically built from shared memory nodes connected by a high speed network. That architecture, combined with the trend towards less memory per core, encourages programmers to use a mixture of message passing and multithreaded programming. Unfortunately, the advantages of using threads for in-node programming are hindered by their inability to efficiently communicate between nodes. In this work, we identify some of the performance problems that arise in such hybrid programming environments and characterize conditions needed to achieve high communication performance for multiple threads: addressability of targets, separability of communication paths, and full direct reachability to targets. Using the GASNet communication layer on the Cray XC30 as our experimental platform, we show how to satisfy these conditions. We also discuss how satisfying these conditions is influenced by the communication abstraction, implementation constraints, and the interconnect messaging capabilities. To evaluate these ideas, we compare the communication performance of a thread-based node runtime to a process-based runtime. Without our GASNet extensions, thread communication is significantly slower than processes - up to 21x slower. Once the implementation is modified to address each of our conditions, the two runtimes have comparable communication performance. This allows programmers to more easily mix models like OpenMP, CILK, or pthreads with a GASNet-based model like UPC, with the associated performance, convenience and interoperability advantages that come from using threads within a node. © 2014 ACM

Creation of Flexible Data Structure for an Emerging Network Control Protocol

Due to increasing number of versions of OpenFlow protocol, it is getting harder day by day to use isolated data structure support of OpenFlow protocol. There is high degree of variability between each versions of OpenFlow protocol. Each version of OpenFlow specifies an interface and the collection of abstractions present in a switch that can be manipulated. So our focus of this thesis is to use the data structure (Avro) which supports OpenFlow protocol through software infrastructure proposed by Warp development group. Using this we have developed the OpenFlow version 1.2 support to Warp controller. Warp architecture uses Avro data structure which has advantages like easy integration of new version, update existing version and apply run time changes, version control, data exchange and easy schema processing which heavily impact on performance and flexibility of OpenFlow controller. These mentioned factors are compared against other OpenFlow controller architectures such as Floodlight, Ryu etc. Comparing obtained observations with different architectures conclude that Warp is more flexible architecture as compared to Floodlight and Ryu.Engineering Technology, Department o

End-to-end security for mobile devices

Thesis (Master)--Izmir Institute of Technology, Computer Engineering, Izmir, 2004Includes bibliographical references (leaves: 120)Text in English; Abstract: Turkish and Englishix, 133 leavesEnd-to-end security has been an emerging need for mobile devices with the widespread use of personal digital assistants and mobile phones. Transport Layer Security Protocol (TLS) is an end-to-end security protocol that is commonly used in Internet, together with its predecessor, SSL protocol. By using TLS protocol in mobile world, the advantage of the proven security model of this protocol can be taken.J2ME (Java 2 Micro Edition) has been the de facto application platform used in mobile devices. This thesis aims to provide an end-to-end security protocol implementation based on TLS 1.0 specification and that can run on J2ME MIDP (Mobile Information Device Profile) environment. Because of the resource intensive public-key operations used in TLS, this protocol needs high resources and has low performance. Another motivation for the thesis is to adapt the protocol for mobile environment and to show that it is possible to use the protocol implementation in both client and server modes. An alternative serialization mechanism is used instead of the standard Java object serialization that is lacking in MIDP. In this architecture, XML is used to transmit object data.The mobile end-to-end security protocol has the main design issues of maintainability and extensibility. Cryptographic operations are performed with a free library, Bouncy Castle Cryptography Package. The object-oriented architecture of the protocol implementation makes the replacement of this library with another cryptography package easier.Mobile end-to-end security protocol is tested with a mobile hospital reservation system application. Test cases are prepared to measure the performance of the protocol implementation with different cipher suites and platforms. Measured values of all handshake operation and defined time spans are given in tables and compared with graphs

Synchronization of hierarchical data

Synchronizace a přenos komplexních dat po síti může být náročným problémem. Společnost Pocket Virtuality potřebovala řešení pro svou platformu pro vzdálenou přítomnost, která by poskytovala synchronizační služby mezi zařízeními v této platformě. Tato zařízení musí mít možnost rychle a snadno vyměňovat velká a komplexní hierarchická data ve formě grafů scén obsahujících 3D modely, textury a další binární data a synchronizovat kopie těchto struktur na jiných zařízeních. Tato práce se zabývá analýzou stávajícího prostředí platformy Fata Morgana a jejích požadavků. Tato analýza je pak základem pro seznam funkčních a nefunkčních požadavků na síťové řešení. Knihovna FMLink je výsledkem fáze návrhu a implementace této práce. Jedná se o síťovou knihovnu navrženou pro více platforem, vysoce efektivní a odolnou vůči zhoršeným síťovým podmínkám. Pro splnění bezpečnostních požadavků poskytuje FMLink podporu kryptografického protokolu TLS. Tato knihovna je testována proti mnoha možným degradacím sítě a testována v různých emulovaných síťových podmínkách. Testy prokázaly, že knihovna může být nasazena a použita mnoha aplikacemi v platormě Fata Morgana.Synchronization and transfer of complex data over the network can be a challenging problem. The company Pocket Virtuality needed a solution for its remote-presence platform, which would provide synchronization services between the devices in this platform. These devices need to quickly and easily exchange large and complex hierarchical data in the form of the scene graphs containing 3D models, textures, and other binary data and synchronize copies of these structures on other devices. \par This thesis revolves around the analysis of the existing environment of the Fata Morgana platform and its requirements. This analysis is then the basis for the list of functional and non-functional requirements of the networking solution. \par The FMLink library is the result of the design and implementation phase of this thesis. It is a networking library designed to be multi-platform, highly efficient, and resistant to degraded network conditions. To satisfy the security requirements, FMLink provides support for the TLS cryptographic protocol. \par This library is tested against multiple possible network degradations and tested in various emulated network conditions. The tests proved the library can be deployed and used by many Fata Morgana applications