Expert systems for security trend analysis of transient-voltage-limited power systems

In this dissertation, we apply expert system techniques and Transient Energy Function (TEF) method results for dynamic system security assessment (DSSA). The concept of power system vulnerability combines the effect of contingencies on the security level and its rate of change with the changing system conditions and/or parameters. Vulnerability of a power system can be computed using the results of the sensitivity analysis program of the TEF method. The computation of vulnerability requires a large amount of data obtained from the results of stability analysis programs and this data needs to be organized into a structured knowledge base for DSSA. Further, the power system operators combine the above stability results with their experience and understanding of the power system in deciding the necessary corrective actions. This decision making process, which is based on heuristic rules, can be better solved using expert system techniques than algorithmic techniques;This dissertation describes an implementation of an expert system for DSSA which uses data from the Northern States Power Company (NSP) in Minnesota under certain operating conditions. The NSP system is transient-voltage-limited, and the security index used by NSP is the Twin City Export Margin (TCEM). The TCEM is the difference in MW between the actual export of power from Twin Cities and its allowable limit computed from stability results. This security index is correlated to the normalized energy margin [delta] V of the TEF method. The expert system finds the NSP loading trend and uses this trend to predict the trend of the security index, TCEM. The expert system also adjusts the trend of the controlling parameters so that the security index can be kept at a predefined safe and economic level. The expert system primarily uses a supervised learning scheme and has an interactive user interface with graphic output. The TEF method is used for calculating stability information and the sensitivities of the control parameters on the security index. The knowledge base of the expert system is updated using the results of the TEF method

Literature Review For Networking And Communication Technology

Report documents the results of a literature search performed in the area of networking and communication technology

UBIDEV: a homogeneous service framework for pervasive computing environments

This dissertation studies the heterogeneity problem of pervasive computing system from the viewpoint of an infrastructure aiming to provide a service-oriented application model. From Distributed System passing through mobile computing, pervasive computing is presented as a step forward in ubiquitous availability of services and proliferation of interacting autonomous entities. To better understand the problems related to the heterogeneous and dynamic nature of pervasive computing environments, we need to analyze the structure of a pervasive computing system from its physical and service dimension. The physical dimension describes the physical environment together wit the technology infrastructure that characterizes the interactions and the relations within the environment; the service dimension represents the services (being them software or not) the environment is able to provide [Nor99]. To better separate the constrains and the functionalities of a pervasive computing system, this dissertation classifies it in terms of resources, context, classification, services, coordination and application. UBIDEV, as the key result of this dissertation, introduces a unified model helping the design and the implementation of applications for heterogeneous and dynamic environments. This model is composed of the following concepts: • Resource: all elements of the environment that are manipulated by the application, they are the atomic abstraction unit of the model. • Context: all information coming from the environment that is used by the application to adapts its behavior. Context contains resources and services and defines their role in the application. • Classification: the environment is classified according to the application ontology in order to ground the generic conceptual model of the application to the specific environment. It defines the basic semantic level of interoperability. • Service: the functionalities supported by the system; each service manipulates one or more resources. Applications are defined as a coordination and adaptation of services. • Coordination: all aspects related to service composition and execution as well as the use of the contextual information are captured by the coordination concept. • Application Ontology: represents the viewpoint of the application on the specific context; it defines the high level semantic of resources, services and context. Applying the design paradigm proposed by UBIDEV, allows to describe applications according to a Service Oriented Architecture[Bie02], and to focus on application functionalities rather than their relations with the physical devices. Keywords: pervasive computing, homogenous environment, service-oriented, heterogeneity problem, coordination model, context model, resource management, service management, application interfaces, ontology, semantic services, interaction logic, description logic.Questa dissertazione studia il problema della eterogeneit`a nei sistemi pervasivi proponendo una infrastruttura basata su un modello orientato ai servizi. I sistemi pervasivi sono presentati come un’evoluzione naturale dei sistemi distribuiti, passando attraverso mobile computing, grazie ad una disponibilit`a ubiqua di servizi (sempre, ovunque ed in qualunque modo) e ad loro e con l’ambiente stesso. Al fine di meglio comprendere i problemi legati allintrinseca eterogeneit`a dei sistemi pervasivi, dobbiamo prima descrivere la struttura fondamentale di questi sistemi classificandoli attraverso la loro dimensione fisica e quella dei loro servizi. La dimensione fisica descrive l’ambiente fisico e tutti i dispositivi che fanno parte del contesto della applicazione. La dimensione dei servizi descrive le funzionalit`a (siano esse software o no) che l’ambiente `e in grado di fornire [Nor99]. I sistemi pervasivi vengono cos`ı classificati attraverso una metrica pi `u formale del tipo risorse, contesto, servizi, coordinazione ed applicazione. UBIDEV, come risultato di questa dissertazione, introduce un modello uniforme per la descrizione e lo sviluppo di applicazioni in ambienti dinamici ed eterogenei. Il modello `e composto dai seguenti concetti di base: • Risorse: gli elementi dell’ambiente fisico che fanno parte del modello dellapplicazione. Questi rappresentano l’unit`a di astrazione atomica di tutto il modello UBIDEV. • Contesto: le informazioni sullo stato dell’ambiente che il sistema utilizza per adattare il comportamento dell’applicazione. Il contesto include informazioni legate alle risorse, ai servizi ed alle relazioni che li legano. • Classificazione: l’ambiente viene classificato sulla base di una ontologia che rappresenta il punto di accordo a cui tutti i moduli di sistema fanno riferimento. Questa classificazione rappresenta il modello concettuale dell’applicazione che si riflette sull’intero ambiente. Si definisce cos`ı la semantica di base per tutto il sistema. • Servizi: le funzionalit`a che il sistema `e in grado di fornire; ogni servizio `e descritto in termini di trasformazione di una o pi `u risorse. Le applicazioni sono cos`ı definite in termini di cooperazione tra servizi autonomi. • Coordinazione: tutti gli aspetti legati alla composizione ed alla esecuzione di servizi cos`ı come l’elaborazione dell’informazione contestuale. • Ontologia dell’Applicazione: rappresenta il punto di vista dell’applicazione; definisce la semantica delle risorse, dei servizi e dell’informazione contestuale. Applicando il paradigma proposto da UBIDEV, si possono descrivere applicazioni in accordo con un modello Service-oriented [Bie02] ed, al tempo stesso, ridurre l’applicazione stessa alle sue funzionalit`a di alto livello senza intervenire troppo su come queste funzionalit` a devono essere realizzate dalle singole componenti fisiche

State-of-the-art Assessment For Simulated Forces

Summary of the review of the state of the art in simulated forces conducted to support the research objectives of Research and Development for Intelligent Simulated Forces

Towards the application of artificial intelligence techniques for discrete event simulation

The possibility of incorporating Artificial Intelligence (A.I) techniques into Visual Interactive Discrete Event Simulation was examined. After a study the current state of the art, work was undertaken to investigate the usefulness of PROLOG as a simulation language. This led to the development of a working Simulation Engine, allowing simulations to be developed quickly. The way PROLOG facilitated development of the engine indicated a possible usefulness as a medium for controlling external simulations. Tests on the feasibility of this were made resulting in the development of an assembler link which allows PROLOG to remotely communicate with and control procedural language programs resident on a separate microcomputer. Experiments using this link were then made to test the application of A.I. techniques to current visual simulations. Studies were carried out on the controlling of the simulation, the monitoring and learning from a simulation, the use of simulation as a window to expert system performance, and on the manipulation of the simulation. This study represents a practical attempt to understand and develop the possible uses of A.I. techniques within visual interactive simulation. The thesis concludes with a discussion of the advantages attainable through such a merger of techniques, followed by areas in which the research may be expanded

Engineering an Advanced Location-Based Augmented Reality Engine for Smart Mobile Devices

Daily business routines more and more require to access information systems in a mobile manner, while preserving a desktop-like feeling at the same time. The goal of this work is to outline the engineering process of a sophisticated mobile service running on a smartphone. More precisely, we show how to develop the core of a location-based augmented reality engine for the iPhone 4S based on the operating system iOS 5.1 (or higher). We denote this engine as AREA. In particular, we develop concepts for coping with limited resources on a mobile device, while providing a smooth user augmented reality experience at the same time. We further present and develop a suitable application architecture in this context, which easily allows integrating augmented reality with a wide range of applications

Real Islamic Logic

Four options for assigning a meaning to Islamic Logic are surveyed including a new proposal for an option named "Real Islamic Logic" (RIL). That approach to Islamic Logic should serve modern Islamic objectives in a way comparable to the functionality of Islamic Finance. The prospective role of RIL is analyzed from several perspectives: (i) parallel distributed systems design, (ii) reception by a community structured audience, (iii) informal logic and applied non-classical logics, and (iv) (in)tractability and artificial intelligence

Eliciting and understanding commonsense reasoning about motion.

The focus of the present research is on children's commonsense reasoning in mechanics. The important effect of pre-instructional ideas on children's learning is now widely recognised and much effort has gone into investigating what these ideas are like in various domain areas in science in the past few years. Early researches in this area have provided us with a comprehensive catalog of phenomenological descriptions of various aspects of children's reasoning about forces and motion. A related line of research has grown over recent years, which attempts to probe into whether there are deeper explanations underlying these misconceptions. If we take scientific theories and commonsense reasoning as two ends of a dichotomy, then early researches in this field have predominantly started from the scientific end, looking towards the intuitive end, trying to find out where the intuitive ideas go astray. To look for deeper levels of analysis, some have since turned to looking from the opposite end, trying to take children's ideas seriously, in their own right and not as a distortion of the scientific view. This latter perspective is the one taken by the present research and is believed to be appropriate if an understanding of the phenomenological descriptions of children's intuitive ideas is to be attained. The present research sets out to investigate the possible cognitive models used in the spontaneous interpretation of and reasoning about motion by students with varying amounts of Physics instruction. It is hoped that the resulting models will not only provide a context for interpreting children's misconceptions, but also provide insight into the evolution of naive cognitive models to more scientific ones. The research consists of two tasks. The first is a classification task asking students to categorize comic strip pictures about motion and to explain their underlying reasoning. The second is a programming task, asking students to write expert systems about motion in the language PROLOG. The second task is in fact one of self elicitation of knowledge by the students themselves under the assistance of the researcher. The advantage of such an exercise is that the representation is not only open for inspection by the students but is also explorable. The results from both tasks will be analysed and synthesized in the thesis