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41.
  • Babadi, Aein S., et al. (författare)
  • Impact of doping and diameter on the electrical properties of GaSb nanowires
  • Ingår i: Applied Physics Letters. - : American Institute of Physics (AIP). - 0003-6951. ; 110:5
  • Tidskriftsartikel (refereegranskat)abstract
    • The effect of doping and diameter on the electrical properties of vapor-liquid-solid grown GaSb nanowires was characterized using long channel back-gated lateral transistors and top-gated devices. The measurements showed that increasing the doping concentration significantly increases the conductivity while reducing the control over the channel potential and shifting the threshold voltage, as expected. The highest average mobility was 85 cm2/V·s measured for an unintentionally doped GaSb nanowire with a diameter of 45 nm, whereas medium doped nanowires with large diameters (81 nm) showed a value of 153 cm2/V·s. The mobility is found to be independent of nanowire diameter in the range of 36 nm-68 nm, while the resistivity is strongly reduced with increasing diameter attributed to the surface depletion of charge carriers. The data are in good agreement with an analytical calculation of the depletion depth. A high transconductance was achieved by scaling down the channel length to 200 nm, reaching a maximum value of 80 μS/μm for a top-gated GaSb nanowires transistor with an ON-resistance of 26 kΩ corresponding to 3.9 Ω.mm. The lowest contact resistance obtained was 0.35 Ω·mm for transistors with the highest doping concentration.
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42.
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43.
  • Bengtsson, Kenneth, et al. (författare)
  • Så kan Sverige bli ledande nation i resurseffektivitet
  • 2016
  • Ingår i: Dagens Nyheter. - 1101-2447. ; :2016-04-30
  • Tidskriftsartikel (populärvet., debatt m.m.)abstract
    • Ny rapport. Det svenska näringslivet kan bli mer hållbart, resurssmart och därmed internationellt konkurrenskraftigt. Men för det behövs en tydlig politisk avsiktsförklaring och riktlinjer. Vi har listat sex områden där policyutveckling brådskar, skriver företrädare för näringsliv, forskning och myndigheter i en gemensam uppmaning.
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44.
  • Berg, Martin, et al. (författare)
  • A transmission line method for evaluation of vertical InAs nanowire contacts
  • 2015
  • Ingår i: Applied Physics Letters. - : American Institute of Physics (AIP). - 0003-6951. ; 107:23
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper, we present a method for metal contact characterization to vertical semiconductor nanowires using the transmission line method (TLM) on a cylindrical geometry. InAs nanowire resistors are fabricated on Si substrates using a hydrogen silsesquioxane (HSQ) spacer between the bottom and top contact. The thickness of the HSQ is defined by the dose of an electron beam lithography step, and by varying the separation thickness for a group of resistors, a TLM series is fabricated. Using this method, the resistivity and specific contact resistance are determined for InAs nanowires with different doping and annealing conditions. The contacts are shown to improve with annealing at temperatures up to 300 degrees C for 1min, with specific contact resistance values reaching down to below 1 Omega mu m(2). (C) 2015 AIP Publishing LLC.
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45.
  • Berg, Martin, et al. (författare)
  • Electrical Characterization and Modeling of Gate-Last Vertical InAs Nanowire MOSFETs on Si
  • Ingår i: IEEE Electron Device Letters. - : IEEE - Institute of Electrical and Electronics Engineers Inc.. - 0741-3106. ; 37:8, s. 966-969
  • Tidskriftsartikel (refereegranskat)abstract
    • Vertical InAs nanowire transistors are fabricated on Si using a gate-last method, allowing for lithography-based control of the vertical gate length. The best devices combine good ON- and OFF-performance, exhibiting an ON-current of 0.14 mA/μm, and a sub-threshold swing of 90 mV/dec at 190 nm LG. The device with the highest transconductance shows a peak value of 1.6 mS/μm. From RF measurements, the border trap densities are calculated and compared between devices fabricated using the gate-last and gate-first approaches, demonstrating no significant difference in trap densities. The results thus confirm the usefulness of implementing digital etching in thinning down the channel dimensions.
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46.
  • Berg, Martin, et al. (författare)
  • Self-aligned, gate-last process for vertical InAs nanowire MOSFETs on Si
  • Ingår i: Technical Digest - International Electron Devices Meeting, IEDM. - : Institute of Electrical and Electronics Engineers Inc.. - 9781467398930 ; 2016-February
  • Konferensbidrag (refereegranskat)abstract
    • In this work, we present a novel self-aligned gate-last fabrication process for vertical nanowire metal-oxide-semiconductor field-effect transistors. The fabrication method allows for exposure dose-defined gate lengths and a local diameter reduction of the intrinsic channel segment, while maintaining thicker highly doped access regions. Using this process, InAs nanowire transistors combining good on-and off-performance are fabricated demonstrating Q = gm,max/SS = 8.2, which is higher than any previously reported vertical nanowire MOSFET.
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47.
  • Bertilsson, Erik, et al. (författare)
  • Use of digital human modelling and consideration of anthropometric diversity in Swedish industry
  • 2010
  • Ingår i: Proceedings of the 42nd annual Nordic Ergonomic Society Conference. - 9788299574723
  • Konferensbidrag (refereegranskat)abstract
    • This  paper  study  and  clarify  problems,  needs  and  opportunities  when  working  with anthropometric  diversity  in  digital  human  modelling  (DHM)  systems.  A  comparison between  product  development  and  production  development  in  Swedish  automotive industry is made. Interviews with DHM users and ergonomics specialists about their way of working with anthropometric diversity confirmed that simulations are often done with only one or  a  few  human models.  The reason for  this  is  claimed  to  be  time  consuming processes, both at the creation of the human model but mainly when correctly positioning the model in the CAD environment.
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48.
  • Billing, E. A., et al. (författare)
  • Finding Your Way from the Bed to the Kitchen: Reenacting and Recombining Sensorimotor Episodes Learned from Human Demonstration
  • 2016
  • Ingår i: Frontiers in Robotics and Ai. - Lausanne, Switzerland : Frontiers Research Foundation. - 2296-9144. ; 3
  • Tidskriftsartikel (refereegranskat)abstract
    • Several simulation theories have been proposed as an explanation for how humans and other agents internalize an "inner world" that allows them to simulate interactions with the external real world - prospectively and retrospectively. Such internal simulation of interaction with the environment has been argued to be a key mechanism behind mentalizing and planning. In the present work, we study internal simulations in a robot acting in a simulated human environment. A model of sensory-motor interactions with the environment is generated from human demonstrations and tested on a Robosoft Kompai robot. The model is used as a controller for the robot, reproducing the demonstrated behavior. Information from several different demonstrations is mixed, allowing the robot to produce novel paths through the environment, toward a goal specified by top-down contextual information. The robot model is also used in a covert mode, where the execution of actions is inhibited and perceptions are generated by a forward model. As a result, the robot generates an internal simulation of the sensory-motor interactions with the environment. Similar to the overt mode, the model is able to reproduce the demonstrated behavior as internal simulations. When experiences from several demonstrations are combined with a top-down goal signal, the system produces internal simulations of novel paths through the environment. These results can be understood as the robot imagining an "inner world" generated from previous experience, allowing it to try out different possible futures without executing actions overtly. We found that the success rate in terms of reaching the specified goal was higher during internal simulation, compared to overt action. These results are linked to a reduction in prediction errors generated during covert action. Despite the fact that the model is quite successful in terms of generating covert behavior toward specified goals, internal simulations display different temporal distributions compared to their overt counterparts. Links to human cognition and specifically mental imagery are discussed.
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49.
  • Björklund, Erik, et al. (författare)
  • Pre-hospital thrombolysis delivered by paramedics is associated with reduced time delay and mortality in ambulance-transported real-life patients with ST-elevation myocardial infarction
  • 2006
  • Ingår i: European Heart Journal. - 0195-668X .- 1522-9645. ; 27:10, s. 1146-1152
  • Tidskriftsartikel (refereegranskat)abstract
    • AIMS: There are sparse data on the impact of pre-hospital thrombolysis (PHT) in real-life patients. We therefore evaluated treatment delays and outcome in a large cohort of ambulance-transported real-life patients with ST-elevation myocardial infarction (STEMI) according to PHT delivered by paramedics or in-hospital thrombolysis. METHODS AND RESULTS: Prospective cohort study used data from the Swedish Register of Cardiac intensive care on patients admitted to the coronary care units of 75 Swedish hospitals in 2001-2004. Ambulance-transported thrombolytic-treated patients younger than age 80 with a diagnosis of acute myocardial infarction were included. Patients with PHT (n=1690) were younger, had a lower prevalence of co-morbid conditions, fewer complications, and a higher ejection fraction (EF) than in-hospital-treated patients (n=3685). Median time from symptom onset to treatment was 113 min for PHT and 165 min for in-hospital thrombolysis. One-year mortality was 7.2 vs. 11.8% for PHT and in-hospital thrombolysis, respectively. In a multivariable analysis, after adjusting for baseline characteristics and rescue angioplasty, PHT was associated with lower 1-year mortality (odds ratio 0.71, 0.55-0.92, P=0.008). CONCLUSION: When compared with regular in-hospital thrombolysis, pre-hospital diagnosis and thrombolysis with trained paramedics in the ambulances are associated with reduced time to thrombolysis by almost 1 h and reduced adjusted 1-year mortality by 30% in real-life STEMI patients.
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50.
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