Joustava höyrykammion simulointimalli mobiililaitteiden lämpösimulaatioihin

Heat loads produced by electronics inside a mobile device are increasing as more computing power is packed into them. During the design phase of a product, these loads have to be taken into account. Simulations provides a way to try different designs more quickly, and built-in optimization tools help to find the most suitable solution. Vapor chambers are thin heat spreaders that offer very high spreading capabilities without adding too much thickness to a low profile device. They work by evaporating water to steam, which transfers heat away from a heat source to the cooler regions of the chamber. This means that to simulate a vapor chamber correctly it would require simulating phase changes and rapid mass flows in very thin volume. This would consume a lot of computing time, which makes it unusable in detailed simulation in the system level models. Therefore, a simpler model has to be developed. A few of these exist, but they were considered to be too complex for the current application. The goal of this thesis was to develop a behavioral model, which would model the vapor chamber as one domain in the CFD simulation model. Experimental data was taken as the basis of the behavioral model. The measurements were done with a 0.6 mm vapor chamber and a 3 mm copper reference sample. The experimental setup was replicated into a commercial CFD simulation software and the model was tuned to match with the calibration sample. Then, using the tuned model, the thin vapor chamber was simulated by assuming various thermal conductivity values. Data from the simulations were compared to the experiments by using RMSE minimization. It produced a function that described how the vapor chamber’s effective conductivity changes with temperature. To use the algorithm built into the CFD software, a linear approximation was applied to the function. The linearization provided parameters that enabled to create a temperature dependent material model that was used in the one cuboid behavioral model of the vapor chamber

Systematic search for enhancer elements and somatic allelic imbalance at seven low-penetrance colorectal cancer predisposition loci

Peer reviewe

Joustava höyrykammion simulointimalli mobiililaitteiden lämpösimulaatioihin

Heat loads produced by electronics inside a mobile device are increasing as more computing power is packed into them. During the design phase of a product, these loads have to be taken into account. Simulations provides a way to try different designs more quickly, and built-in optimization tools help to find the most suitable solution. Vapor chambers are thin heat spreaders that offer very high spreading capabilities without adding too much thickness to a low profile device. They work by evaporating water to steam, which transfers heat away from a heat source to the cooler regions of the chamber. This means that to simulate a vapor chamber correctly it would require simulating phase changes and rapid mass flows in very thin volume. This would consume a lot of computing time, which makes it unusable in detailed simulation in the system level models. Therefore, a simpler model has to be developed. A few of these exist, but they were considered to be too complex for the current application. The goal of this thesis was to develop a behavioral model, which would model the vapor chamber as one domain in the CFD simulation model. Experimental data was taken as the basis of the behavioral model. The measurements were done with a 0.6 mm vapor chamber and a 3 mm copper reference sample. The experimental setup was replicated into a commercial CFD simulation software and the model was tuned to match with the calibration sample. Then, using the tuned model, the thin vapor chamber was simulated by assuming various thermal conductivity values. Data from the simulations were compared to the experiments by using RMSE minimization. It produced a function that described how the vapor chamber’s effective conductivity changes with temperature. To use the algorithm built into the CFD software, a linear approximation was applied to the function. The linearization provided parameters that enabled to create a temperature dependent material model that was used in the one cuboid behavioral model of the vapor chamber

Liiketoimintaverkostojen johtaminen Venäjällä : STROI-hankkeen loppuraportti

STROI-hankkeen loppuraportt

Yhteistyöllä menestykseen : BOAT-hankkeen tulosraportti

BOAT-hanketta toteutettavat HAMK, Kyamk, Laurea ja TuAMK. Toteutuksen kansainvälisenä yhteistyöverkostona on METNET -verkosto ja eräät venäläiset, ukrainalaiset ja valkovenäläiset korkeakoulut. Hankkeen päärahoittaja on Hämeen ELY-keskus ESR-rahoituksella. BOAT-hankkeen tavoitteena on kehittää kuhunkin Itämeren maahan suomalaisille yrityksille ja julkisille toimijoille niiden toimintaa edistävä verkosto, jonka avulla voidaan ratkaista kansainvälistä toimintaa haittaavia ongelmia ja löytää uusia toimintamahdollisuuksia kansainväliseen yhteistyöhön ja liiketoimintaan. Yhteistyön aloittaminen on vaatinut ja vaatii Itä-Euroopan maissa edelleen hyviä henkilökohtaisia verkostoja, suhteita ja vastavuoroisuutta. Hanke on jaettu kahteen pääosioon: 1) korkeakoulu- ja yritysyhteistyön sekä politiikan tekijöiden (viranomaisten) yhteistyön toimintamallit ja verkostojen luominen. 2) Euroopan Unionin Small Business Act (SBA) periaatteiden toteutumisen arviointi ja kehittämiskohteet eri maissa. Tässä raportissa kuvataan osion 1 keskeiset tulokset; SBA:sta on laadittu erillinen raportti. Tulosraportissa esitetään kunkin tutkijaryhmän saamat tulokset omina kappaleinaan

STROI-network - Busineess Networks in Russia : Final report 2009

HAMK University of Applied Sciences, Tampere University of Technology and VTT Technical Research Centre of Finland are carrying out a common research project STROI Network together with Russian universities. The Russian universities are State University Higher School of Economics from Moscow and State University Graduate School of Management from St Petersburg. The objective of the project is to find out or fit present management and leadership models suitable for the Russian business environment and context

STROI-network - Business Netwoks in Russia : Intermediate Report 2008

HAMK University of Applied Sciences, Tampere University of Technology and VTT Technical Research Centre of Finland are carrying out a common research project STROI Network together with Russian universities. The Russian universities are State University Higher School of Economics from Moscow and State University Graduate School of Management from St Petersburg. The objective of the project is to find out or fit present management and leadership models suitable for the Russian business environment and context

ROCKET-hankkeen loppuraportti, osio 1

ROCKET – hanketta toteutettavat HAMK, KyAMK, Laurea, LUT Lahti, Metropolia, Saimaan AMK ja TuAMK. Toteutuksen kansainvälisenä yhteistyöverkostona on METNET -verkosto ja eräät kiinalaiset ja venäläiset sekä intialaiset korkeakoulut. Hankkeen päärahoittaja on Päijät-Hämeen liitto EAKR-rahoituksella. Rocket-hankkeen tavoitteena on kehittää suomalaisiin korkeakouluihin sellaisia verkottuneita rakenteita, jotka pysyvästi tukevat suomalaisten metalli- ja koneteknologia-alan yritysten innovaatiotoimintaa ja kansainvälistymistä CEE-maihin ja valittuihin Aasian maihin

Small Business Act in Practice in the Baltic Sea States

The role of Small and Medium Sized Enterprises (SMEs) in Europe has been repeatedly acknowledged at the highest political level. In the year 2008 the European Council expressed strong support for an initiative to strengthen SMEs’ sustainable growth and competitiveness, by publishing a declaration called “Small Business Act” (SBA). This report has been done to help the decision makers and administrators in European Countries to better serve smaller companies. We hope that the practical results collected into this publication will point out the most important things to arrange in the Baltic Sea States in the long run. This publication has been done with the resources of BOAT project, which is partly financed by the European Social Fund (ESF)

ROCKET-hanke väliraportti 2

ROCKET – hanketta toteutettavat HAMK, KyAMK, Laurea, LUT Lahti, Metropolia, Saimaan AMK ja TuAMK. Toteutuksen kansainvälisenä yhteistyöverkostona on METNET -verkosto ja eräät kiinalaiset ja venäläiset korkeakoulut. Hankkeen päärahoittaja on Päijät-Hämeen liitto EAKR-rahoituksella. Rocket – hankkeen tavoitteena on kehittää suomalaisiin korkeakouluihin sellaisia verkottuneita rakenteita, jotka pysyvästi tukevat suomalaisten metalli- ja koneteknologia-alan yritysten innovaatiotoimintaa ja kansainvälistymistä erityisesti CEE-maiden ja Aasian maihin suuntaan