A evaluation of Ruby on Rails regarding performance.

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Unique customizations (options) of features in forklifts are often requested by customers. When new options are created or existing options have to be modified in the main software the complexity increases, the firmware revision pool gets large and with the increasing code size the memory limit is threatened. This affects the software development since the frequent modification of the option handler software is very resource consuming. Therefore it is desirable to have a highly modular system for the option handler to simplify the development process. Although the market value of this improvement is negligible the possible long term savings is the desirable effect. This thesis explores the possibility of migrating the option handling software to a dedicated hardware module. This helps the development process by increasing the modularity of the system architecture and thus reducing the development scope. The tools and the approach to accomplish this option handler is analyzed. A system model of the resulting approach is designed and a prototype is developed to validate the result.

The Open Systems Interconnect Model (OSI) is a conceptual model of networking thatcategorizes network functions into seven layers. It is defined in this model that how layerscommunicate with each other. In this thesis, we address common Layer 2 attacks and theirsolutions. Layer 2 is considered a very weak link in a secure network. If the data is compromisedat Layer 2, it cannot be detected at other layers because each layer works without the knowledgeof other layers. We discuss Layer 2 weakness and vulnerability exploitation tools briefly. It isexplained how an attacker can exploit network by using different attack tools. Our results showthat these attacks are very productive if a network administrator does not implement propersecurity at Layer 2 in the OSI model. We propose solutions to secure Layer 2 devices and thesesolutions are implemented by using attack tools. Security configurations are deployed to combatagainst attacks and protect the integrity, confidentiality, and availability of the network traffic.

I dagens samhälle har telefonerna gått ifrån att bara vara ett kommunikationsmedel till så mycket mer. Idag finns miljontals applikationer till telefonerna som gör dom mer lik en nöjesenhet än en telefon. Syftet med projektet har varit att med hjälp av förundersökningar skapa en mobilapplikation till operativsystemet Android. I applikationen är syftet att lägga vikt på användarvänlig design, snabb och effektiv funktionalitet. Målet med projektet är att få kunskap hur syftet ska kunna uppnås. Förundersökningenhar som uppgift att ge svar på hur en applikation blir populär och framgångsrik. Applikationen som har skapats i projektet är en kasinoapplikation som kommer innehålla speciella funktioner baserat på svaren från förundersökningen. Utöverapplikationen har en server skapats som klienten ska kommunicera med vid inloggning och vid lagring av information. I projektet har utvecklingsmetoden Extremprogrammering använts och applikationen har utvecklats i miljön Eclipse med hjälp av verktygen Android SDK och Facebook SDK. För att enklare kunna skriva programkod ritades skisser på applikationen och UML-diagram för de mest komplicerade funktionerna. De mål som sattes upp för projektet har uppfyllts och de problem som fanns innan projektet har lösts. Det finns stora säkerhetsrisker just nu som kommer att behövas fixas i framtiden. Det finns även andra förbättringar att göra i framtiden, t.ex. snyggare design och fler funktioner och spel i applikationen. / In modern day, the cellphones have gone from being a simple communicationunit to something so much more. Today there are millions of appliatins for yourphone which makes them more like an entertainmet unit than just a phone. Thepurpose of this project is, with help of reaearch, make a cellphone application tothe operating system Android. The purpose of the application is to make adesign which is clean and has high usability, fast and effective software and tomake the application able to be successful. The projects goal is to gainknowledge in how to achieve that purpose. The goal with the research is to gainknowledge about what makes an application desirable and popular. The application created in this project is a casino application that will includecertain functions depending on the results of the research. Besides theapplication there was also a server created with the purpose of storing userinformation and communication between server and client. The developmentmethod used in this project is Extremeprogramming and has been developed inthe Eclipse IDE. There has been modules for Android SDK and Facebook SDKadded to the Eclipse IDE. There was scetches and UML-diagrams drawn tomake the programming easier and to gain better understanding of the mostcomplicated functions. The goal overall with the project has ben fullfilled.Although there is a huge problem with the security risks that will have besolved in future work. Besides working on the security there could also be somefixes made on the design and add more functions and games to the applicationin the future.

The Cholesky factorisation is an efficient tool that, when used correctly, significantlycan reduce the computational complexity in many applications. This thesiscontains an in-depth study of the factorisation, some of its applications andan implementation on the Coresonic SIMT DSP architecture. / Choleskyfaktoriseringen är ett effektivt verktyg som, när det används korrekt, signifikantkan minska beräkningskomplexiteten i många applikationer. Detta examensarbeteinnehåller en ingående studie av faktoriseringen, några av dess applikationersamt en implementation på Coresonic SIMT DSP architecture.

Patientövervakningssystem (eng., Patient data management systems) måste hantera olika datakällor som patientmonitorer, ventilatorer och pumpar. Målet med detta arbete var att utveckla ett generellt och underhållsbart medicinskt protokoll samt ett databassystem för att hantera patientdata från olika medicintekniska instrument inom intensivvården. Ett prototypsystem med databas och experimentellt kommunikationsprotokoll skapades och utvärderades tekniskt mot övervakningsmonitorn Philips MP30. Systemet utvecklades i programmeringsspråket C# och använder sig av en MySQL-databas. Studien visar att det är möjligt att skapa ett protokoll som hanterar olika medicinska datakällor. Rapporten beskriver det framtagna protokollet, datastrukturer, arkitektur samt förekommande relaterade kommunikationsstandarder som används inom sjukvården. / Patient data management systems (PDMS) have to handle various data sources such as patient monitors, ventilators and pumps. The objective of this work was to develop a general and maintainable medical protocol and a database system to manage patient data from various medical instruments in intensive care. A prototype system with an experimental communication protocol and a database was created and evaluated technically with a Philips MP30 patient monitor system. The system was developed in the programming language C# with a MySQL database. The study shows that it is possible to create a protocol that handles various medical data sources. The report describes the developed protocol, data structures, architecture and related communication standards used in healthcare.

Context. It is very common today that e-commerce systems store sensitiveclient information. The database administrators of these typesof systems have access to this sensitive client information and are ableto manipulate it. Therefore, data integrity is of core importance inthese systems and methods to detect fraudulent behavior need to beimplemented. Objectives. The objective of this thesis is to implement and evaluatethe features and performance impact of different methods for achievingdata integrity in a database, Oracle to be more exact.Methods. Five methods for achieving data integrity were tested.The methods were tested in a controlled environment. Three of themwas tested and performance evaluated by a tool emulating a real lifee-commerce scenario. The focus of this thesis is to evaluate the performanceimpact and the fraud detection ability of the implementedmethods. Results. This paper evaluates traditional Digital signature, Linkedtimestamping applied to a Merkle hash tree and Auditing performanceimpact and feature impact wise. Two more methods were implementedand tested in a controlled environment, Merkle hash tree and Digitalwatermarking. We showed results from the empirical analysis, dataverification and transaction performance. In our evaluation we provedour hypothesis that traditional Digital signature is faster than Linkedtimestamping. Conclusions. In this thesis we conclude that when choosing a dataintegrity method to implement it is of great importance to know whichtype of operation is more frequently used. Our experiments show thatthe Digital signature method performed better than Linked timestampingand Auditing. Our experiments did also conclude that applicationof Digital signature, Linked timestamping and Auditing decreasedthe performance by 4%, 12% and 27% respectively, which is arelatively small price to pay for data integrity.

Vid högvolymsproduktion av konsumentelektronik är testtid, mätnogrannhet och fabriksgolvsutrymme synonymt med kostnader. Detta har gjort att man på sektionen Test Engineering vid Ericsson Mobile Communications fabrik i Linköping tagit fram ett testkoncept, kallat Pelle-konceptet, där datorkraft och mätutrustning flyttas in i små utrymmessnåla testfixturer anpassade för både robotiserade produktionslinor och manuella. Det nya testkonceptet saknade på våren 1998 ett generellt mät- och stimulikort för mobiltelefoner vilket specificerades och konstruerades  under sommren och hösten 1998 av författaren och Stefan Lantz. I rapporten beskrivs arbetet med att specificera kortets funktionsblock samt detaljkonstruktion av de funktionsblock som författaren ansvarat för. Rapporten ger även en inblick i designarbetet och dess svårigheter för ett mät- och stimulikort med många olika funktionsblock på en mycket begränsad yta, samt de problem som uppstår i många projekt till följd av förändrade krav, missupfattningar, kommunikationsmissar och saknad dokumentation. / In high volume production of consumer electronics are test time, measurement accuracy, and factory floor space synonymous with costs. This has led to that the Test Engineering department at Ericsson Mobile Communication factory in Linköping has developed a new test concept, called the Pelle-concept, where computation power and measurement equipment is placed in compact test fixtures adapted for both automated and manual production lines. In the spring of 1998 the new test concept was lacking a printed circuit board for generalized measurement and stimuli of mobile phones, which was specified and designed during the summer and fall of 1998 by the author and Stefan Lantz. The report describes the specification of the functional blocks as well as the detailed design of the blocks designed by the author. The report also gives insight into the design work and its difficulties when designing a measurement and stimuli board with many different functional blocks in a very limited space, as well as problems common in many project resulting from changed requirements, misconceptions, communication glitches and missing documentation.

In today's society there is a significant focus on energy efficiency. Despite this, people leave lamps, televisions and computer screens etc. powered on unnecessarily. The goal of this project is to build a simple prototype for home automation where a user, via an application on a mobile phone, can switch on and off the power of an electrical products in the home and as well as being able to check whether such products are switched on or off. The prototype will also collect data on power consumption for these electrical products. This thesis describes the development of the prototype and addresses the choices made during the project. The project resulted in a prototype which after tests showed that there is potential to save energy by using home automation. / Sammanfattning I dagens samhälle är det stor fokus på energieffektivisering. Trots detta låter många människor lampor, tv-apparater och datorskärmar med mera, stå påslagna helt i onödan. Målet med detta projekt är att bygga en enkel prototyp för hemautomation där en användare via en applikation på en mobiltelefon kan slå på och av strömmen för elektriska produkter i hemmet, samt se om dessa produkter är på eller avslagna. Prototypen ska också samla in data om strömförbrukningen för dessa elektriska produkter. Denna uppsats beskriver utvecklingen av prototypen och tar upp de val som har gjorts under projektets gång. Projektet resulterade i en prototyp som efter test visade att det finns potential att använda hemautomation till att spara ström.