Search results for " system design"
showing 10 items of 30 documents
ECO-design of solar driven systems: A performance comparison between the Italian and the Brazilian context
2013
The paper shows a comparative analysis of the performances of two typologies of solar assisted cooling systems for building applications. In particular, Life Cycle Assessment (LCA) methodology is applied to assess the energy and environmental impacts of solar-assisted, heat-driven chillers and conventional compression chillers driven by grid-connected and stand-alone photovoltaic configurations. LCA is applied in compliance with the international standards of ISO 14040. System boundaries are defined following a “cradle to grave” approach, taking into account all the life-cycle phases including the raw materials supply, the production of the components of the plant, the operation and mainten…
A simple and accurate model of photovoltaic modules for power system design
2014
Membrane distillation: Solar and waste heat driven demonstration plants for desalination
2013
Abstract The development of small to medium size, autonomous and robust desalination units is needed to establish an independent water supply in remote areas. This is the motivation for research on alternative desalination processes. Membrane distillation (MD) seems to meet the specific requirements very well. This work is focused on experimental studies on full scale demonstration systems, utilizing a parallel multi MD-module setup. Three different plant concepts are introduced, one of them is waste heat driven and two of them are powered by solar thermal collectors. Design parameters and system design are presented. After the analysis of plant operation a comparison among the plants as we…
On-body to on-body channel characterization
2011
Interest in on-body communication channels is growing as the use of wireless devices increases in medical, consumer and military sensor applications. This paper presents an experimental investigation and analysis of the narrowband on-body propagation channel. This analysis considers each of the factors affecting the channel during a range of stationary and motion activities in different environments with actual wireless mote devices on the body. Use of such motes allows greater freedom in the subject's movements and the inclusion of real-world indoor and outdoor environments in a test sequence. This paper identifies and analyses the effect of the different components of the signal propagati…
Direct lookup and hash-based metadata placement for local file systems
2013
New challenges to file systems' metadata performance are imposed by the continuously growing number of files existing in file systems. The total amount of metadata can become too big to be cached, potentially leading to multiple storage device accesses for a single metadata lookup operation. This paper takes a look at the limitations of traditional file system designs and discusses an alternative metadata handling approach, using hash-based concepts already established for metadata and data placement in distributed storage systems. Furthermore, a POSIX compliant prototype implementation based on these concepts is introduced and benchmarked. A variety of file system metadata and data operati…
Analysis of the use of a workflow engine for OTRUM system software
2007
Masteroppgave i informasjons- og kommunikasjonsteknologi 2007 – Høgskolen i Agder, Grimstad Workflow engines are attracting more and more attention. Applications based on workflow engine technology are currently developed and deployed by many companies, such as OTRUM Company. In this project, we focus on the analysis and development of an efficient workflow engine for interactive TV. The research project will realize workflow engine solutions based on three choices including commercial workflow engine, open source workflow engine, and a workflow engine implemented from scratch. In this project, we go through all mentioned solutions. In the literature, many proposed workflow engines are invo…
Stochastic Learning-Based Estimation Methods for Pattern Recognition and Its Application to Topic Detection and Tracking
2008
Masteroppgave i informasjons- og kommunikasjonsteknologi 2008 – Universitetet i Agder, Grimstad Every Pattern Recognition (PR) problem involves a training and a testing phase. In the training phase, the system is presented with samples, using which the distribution (also called the classconditional distribution), of the features, is estimated. Traditional PR systems assume that the class-conditional distributions are stationary, and thus that they do not change with time. Recently Oommen and his co-authors have presented a strategy by which the parameters of a binomial/- multinomial distribution can be estimated when the distribution is non-stationary. In this thesis, we propose a selection…
Mutual Backup System
2007
Masteroppgave i informasjons- og kommunikasjonsteknologi 2007 – Høgskolen i Agder, Grimstad I de senere årene har det kommet nye teknologier for backup og behovet for sikkerhetskopiering er i økende vekst. Både privatbrukere og bedrifter har viktige data som må tas kopier av på en sikker måte og oppbevares på et sikret sted. De fleste bedrifter har gode nok ressurser til å lagre sine data via online backup eller andre løsninger som for eksempel SAN. Privatbrukere har ikke de samme lagringsbehovene, og derfor kan online backup være kostbart for lagring av små mengder data. Vår oppgave går ut på å forske på eksisterende løsninger for sikkerhetskopiering og teknologier som kan benyttes for å u…
A Generic Model of Project Management with Dynaplan smia
2008
Masteroppgave i informasjons- og kommunikasjonsteknologi 2008 – Universitetet i Agder, Grimstad Projects are hard to be managed due to the reason of complexity, non -linear relationship and high dynamic. System dynamics has been proven a powerful and efficient way to manage projects. In this research, a generic system dynamics model applying to project management has been made. Through studying the model, the system behaviours have been analyzed and policies to deal with the problems of project management have been established. In addition, an object-oriented feature has been added into the model. The attempt is new to system dynamics modelling, and the outcome is satisfying since it makes …
A generic model of project management with Vensim
2008
Masteroppgave i informasjons- og kommunikasjonsteknologi 2008 – Universitetet i Agder, Grimstad Large projects without good management will often cause cost and deadline overruns, missing the project scope and insufficient quality. The construction of the channel tunnel which link between England and France was budgeted at $7 billion, but it entered service in the second half of 1994 with a price tag of $13 billion. The Disneyland in Paris initially planned to cost $2.25 billion in the project, but finally cost $4 billion. Some projects are even never finished, typically software projects System dynamics has proven to be an effective methodology to explain the reasons of project failure and…