This paper describes the design and implementation of MATLAB*G, a parallel MATLAB on the ALiCE Grid. ALiCE (Adaptive and scaLable internet-based Computing Engine), developed at NUS, is a lightweight grid-computing middleware. Grid applications in ALiCE are written in Java and use the distributed shared memory programming model. Utilizing existing MATLAB functions, MATLAB*G provides distributed matrix computation to the user through a set of simple commands. Currently two forms of parallelism for distributed matrix computation are implemented: task parallelism and job parallelism. Experiments are carried out to investigate the performance of MATLAB*G on each type of parallelism. Results indicate that for large matrix sizes MATLAB*G can be a faster alternative to sequential MATLAB. / Singapore-MIT Alliance (SMA)

The fact is, no organization has ever become great without exceptional leadership - without leaders who can connect the efforts of their teams to the critical objectives of the organization, who can tap the full potential of each individual on their teams, who can align systems and clarify purposes, and who can inspire trust. The purpose of the study is to investigate and compare what management styles business students from Halmstad University, Sweden, will implement. Moreover, this study shows future leaders work preferences and concerns. As a tool for the findings the managerial grid (founded in 1964 by Blake and Mounton) was incorporated with situational theory (Hersey and Blanchard, 1977). The investigation was conducted applying a theoretical framework to empirical data. By analysing leadership styles and students work preferences, it illustrates the kind of leader a business student will potentially become and which direction he/she may take. Overall, the average of 130 business students from Halmstad University shows that they are going to be a Team Leader, because for them the people’s needs as well as the results of their work are important.

Hypersonic flow analysis is performed on an inflatable aerocapture device called a "Ballute" for Titan's Mission. An existing unstructured Cartesian grid methodology is used as a starting point by taking advantage of its ability to automatically generate grids over any deformed shape of the flexible ballute. The major effort for this thesis work is focused on advancing the existing unstructured Cartesian grid methodology. This includes implementing thermochemical nonequilibrium capability and porting it to a parallel computing environment using a Space-Filling-Curve (SFC) based domain decomposition technique. The implemented two temperature thermochemical nonequilibrium solver governs the finite rate chemical reactions and vibrational relaxation in the high temperature regimes of hypersonic flow. In order to avoid the stiffness problem in the explicit chemical solver, a point implicit method is adopted to calculate the chemical reaction source term. The AUSMPW+ scheme with MUSCL data reconstruction is adopted as the numerical scheme to avoid non-physical oscillations and the carbuncle phenomenon. The results for five species air model and for thirteen species N2-CH4-Ar model to simulate Titan entry are included for verification against DPLR (NASA Ames' structured grid hypersonic flow solver). The efficient parallel computation of any unstructured grid flow solver requires an adequate grid decomposition strategy because of its complex spatial data structure. The difficulties of even and block-contiguous partitioning in frequently adapting unstructured Cartesian grids are overcome by implementing the 3D Hilbert SFC. Grids constructed by the SFC for parallel environment promise short inter-CPU communication time while maintaining perfect load balancing between CPUs. The load imbalance due to the local solution adaption is simply apportioned by re-segmenting the curve into even pieces. The detailed structure of the 3D Hilbert SFC and parallel computing efficiency results based on this grid partition method are also presented. Finally, a structural dynamics tool (LS-DYNA) is loosely coupled with the present parallel thermochemical nonequilibrium flow solver to obtain the deformed surface definition of the ballute.

Workshop Mensch-Computer-Vernetzung Eine Einführung in Geschichte und Ideen des Grid-Computing. Kurze Vorstellung des 'Globus-Toolkit'.

Thèse doctorat : Informatique : Villeurbanne, INSA : 2007. / Thèse rédigée en anglais. Résumé étendu en français. Titre provenant de l'écran-titre. Bibliogr. p. 192-202.

Šis darbas aprašo pagrindinius Grid paslaugų kūrimo metodus, kurie bando pasiūlyti operacinius suderinamumus, stabilumą ir produktyvumą, nepaisant to, kad pasaulinio tinklo paslaugos yra jauna technologija su keliais standartais. Tikimės, kad Grid paslaugos sukurtos iš pasaulinio tinklo paslaugų parodys vykdymo problemas, bent jau pradžioje, ir kad eksperimentavimas ir alternatyvų kūrimas, pareikalaus efektyvesnių pasaulinio tinklo paslaugų realizacijų. Pasiūlytas modelis sukurtas Grid architektūros pagrindu, taip išvengiant rizikos perkurti visą infrastuktūrą. / This work has described an approach to building Grid Services that attempts to promote interoperability, stability and productivity, despite the fact that Web Services are a young technology with few standards. We anticipate that Grid services built from Web Services will show performance problems, at least initially, and that experimentation and development of alternate, more efficient implementations of some of these Web Services will be necessary. Proposed model is based on existing Grid architecture, without the risk of rebuilding the whole infrastructure.

There is an international effort to develop smart grids to overcome the problems caused by aging power grids. However, to immigrate to the new grid, the IT infrastructure has to be integrated with the current power grid. There is currently an ongoing debate surrounding what would be the best choice for smart grid communication technology. One of the promising communication technologies for smart grid realization is powerline communication (PLC). PLC provides utilities the opportunity of managing their own network infrastructure. Power cables are everywhere; even rural areas are covered with power cables. However, because of its noisy environment and the low capacity of narrowband powerline communication (NBPLC), its viability for smart grid realization is being questioned. To investigate this issue, smart grid communication network requirements and powerline communication technologies and channel models are studied. Then, using MATLAB and Network Simulator-2, powerline communication and a smart grid communication network (SGCN) are simulated. The performance of different powerline channels for smart grid realization is investigated and a viable PLC infrastructure for smart grid communication network is proposed. Furthermore, to have a better understanding of the viability of powerline communication for the smart grid, some future smart grid advanced applications are investigated and integrated to the system. It is shown that although two types of powerline channels do not perform well, the proposed powerline communication infrastructure, even under advanced traffic, is capable of providing the smart grid with its communication prerequisites. / Thesis (Master, Electrical & Computer Engineering) -- Queen's University, 2012-04-30 15:31:43.471

Den Europeiska unionen har sina medlemsländer genom direktivet Energy Performance of Buildings Directive (EPBD) gett i uppdrag att minska energiåtgången för byggnader. Detta ingår i satsningen för att minska klimatpåverkan i hela EU. Nybyggda hus innebär bäst förutsättningar för att minska energiförbrukningen genom att den senaste tekniken kan utnyttjas ihop med utformning enligt de nyaste forskningsrönen. Syftet med det här arbetet är att undersöka om det är möjligt att bygga ett hus som är självförsörjande på el i Sverige genom att använda beprövad teknik. Undersökningen görs genom att bygga en datormodell av ett hus i Simulink för att beräkna energibehov under januari 2010 till december 2013. Huset är 160 m2 stort och står i Karlstad, Värmland. Den använda tekniken i huset är omfattande. De viktigaste komponenterna är en ackumulatortank på 9,3 m3, litium-jon batteri på 58 kWh vid 48 volt, ett vindkraftverk på 2 kWp, solceller på 58 m2och solfångare på 46 m2. Modellhuset liknar i sina egenskaper ett hus som har byggts i Tyskland och jämförs också mot detta avseende energiförbrukning och kostnader. För att kunna bedöma ekonomin jämförs modellhuset även med fem energieffektiva småhus från olika svenska hustillverkare. Modellen använder sig av mätdata som Sveriges meteorologiska och hydrologiska institut (SMHI) ställer allmänheten till förfogande. Data finns för varje timme under beräkningsperioden. Beräkningarna visar att 100 % självförsörjningsgrad på el är möjligt med den valda tekniska utrustningen genom att begränsa elanvändningen till ungefär 2 000 kWh/år. Värmeförsörjning görs med hjälp av solfångarna och ackumulatortanken. Självförsörjningsgraden på solvärme visar sig hamna omkring 58 % av värmebehovet. Den resterande värmen kommer från 4,6 m3 stjälpt björkved som eldas i en vattenmantlad vedpanna och motsvarar ungefär 5 400 kWh. Denna mängd ved kostar i dagsläget mindre än 3 000 kr/år. Datormodellhuset använder sig av mycket teknik vilket medför att priset ligger på ungefär 3,5 miljoner kr. Ett, i storlek och energibehov, jämförbart småhus koster i snitt 3,1 miljoner kr. Ett sådant småhus är dock inte självförsörjande på el. När man bygger ett hus som ligger långt från närmaste elanslutningspunkt behöver även kostnaden för anslutningsarbete beaktas. Ligger den närmaste anslutningspunkt 1 800 meter eller mer från den tänkta byggplatsen blir enbart kostnaderna för att ansluta huset till elnätet över 313 000 kr. Husbyggaren som vill bli oberoende av tillgängligheten av elnätet eller planerar att bygga ett hus som ligger långt ifrån en anslutningspunkt till elnätet har med resultatet från undersökningen ett verktyg för att ta fram planer för sitt bygge. Den undersökta husmodellen sänker de framtida kostnaderna för att driva huset och håller arbetsinsatsen nere för att förse huset med värme och varmvatten. / The European Union has through the Directive Energy Performance of Buildings Directive (EPBD) given a mandate to its members to reduce energy consumption of buildings. This is part of the effort to reduce the carbon footprint across Europe. New houses have the best conditions to reduce their energy consumption by utilizing the latest technologies. This work examines whether it is possible to build a house that is self-sufficient in electricity in Sweden using proven technology. The survey is done by building a computer aided model of a house in Simulink to calculate energy requirements during January 2010 December 2013. The modelhouse is 160 m2 and use climatedata from Karlstad, Värmland. The calculations show that a self-sufficiency rate of 100 % of electricity is possible with the selected technical equipment by limiting the power consumption to 2 000 kWh per year. Heat supply is done by using solar collectors and a storage tank. Self-sufficiency for the heating is up to 58 %, wooden heating supplies the rest.

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