| 1. |
- Johansson, Victoria, et al.
(författare)
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Tala läsa skriva
- 2013
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Ingår i: Johansson, V., Carling, G., & Holmer A. (red.) Språket, människan och världen. Människans språk 1-2.. - Lund : Studentlitteratur. - 9789144083391 ; , s. 53-72
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 2. |
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| 3. |
- Wilson, Christopher, 1974, et al.
(författare)
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Observation of the dynamical Casimir effect in a superconducting circuit
- 2011
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 479:7373, s. 376-9
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Tidskriftsartikel (refereegranskat)abstract
- One of the most surprising predictions of modern quantum theory is that the vacuum of space is not empty. In fact, quantum theory predicts that it teems with virtual particles flitting in and out of existence. Although initially a curiosity, it was quickly realized that these vacuum fluctuations had measurable consequences-for instance, producing the Lamb shift of atomic spectra and modifying the magnetic moment of the electron. This type of renormalization due to vacuum fluctuations is now central to our understanding of nature. However, these effects provide indirect evidence for the existence of vacuum fluctuations. From early on, it was discussed whether it might be possible to more directly observe the virtual particles that compose the quantum vacuum. Forty years ago, it was suggested that a mirror undergoing relativistic motion could convert virtual photons into directly observable real photons. The phenomenon, later termed the dynamical Casimir effect, has not been demonstrated previously. Here we observe the dynamical Casimir effect in a superconducting circuit consisting of a coplanar transmission line with a tunable electrical length. The rate of change of the electrical length can be made very fast (a substantial fraction of the speed of light) by modulating the inductance of a superconducting quantum interference device at high frequencies (>10 gigahertz). In addition to observing the creation of real photons, we detect two-mode squeezing in the emitted radiation, which is a signature of the quantum character of the generation process.
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| 4. |
- Ayatolahi, Fatemeh, 1984, et al.
(författare)
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A study of the impact of single bit-flip and double bit-flip errors on program execution
- 2013
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Ingår i: Lect. Notes Comput. Sci.. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 9783642407925 ; , s. 265-276
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Konferensbidrag (refereegranskat)abstract
- This paper presents the results of an extensive experimental study of bit-flip errors in instruction set architecture registers and main memory locations. Comprising more than two million fault injection experiments conducted with thirteen benchmark programs, the study provides insights on whether it is necessary to consider double bit-flip errors in dependability benchmarking experiments. The results show that the proportion of silent data corruptions in the program output, is almost the same for single and double bit errors. In addition, we present detailed statistics about the error sensitivity of different target registers and memory locations, including bit positions within registers and memory words. These show that the error sensitivity varies significantly between different bit positions and registers. An important observation is that injections in certain bit positions always have the same impact regardless of when the error is injected.
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| 5. |
- Di Leo, D., et al.
(författare)
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On the impact of hardware faults - An investigation of the relationship between workload inputs and failure mode distributions
- 2012
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Ingår i: Lect. Notes Comput. Sci.. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 1611-3349 .- 0302-9743. - 9783642336775 ; , s. 198-209
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Konferensbidrag (refereegranskat)abstract
- Technology scaling of integrated circuits is making transistors increasingly sensitive to process variations, wear-out effects and ionizing particles. This may lead to an increasing rate of transient and intermittent errors in future microprocessors. In order to assess the risk such errors pose to safety critical systems, it is essential to investigate how temporary errors in the instruction set architecture (ISA) registers and main memory locations influence the behaviour of executing programs. To this end, we investigate - by means of extensive fault injection experiments - how such errors affect the execution of four target programs. The paper makes three contributions. First, we investigate how the failure modes of the target programs vary for different input sets. Second, we evaluate the error coverage of a software-implemented hardware fault tolerant technique that relies on triple-time redundant execution, majority voting and forward recovery. Third, we propose an approach based on assembly language metrics which can be used to correlate the dynamic fault-free behaviour of a program with its failure mode distribution obtained by fault injection.
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| 6. |
- Roupé, Mattias, 1975, et al.
(författare)
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Virtuell produktionsplanering med BIM och visualisering
- 2014
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Denna rapport presenterar resultatet från en genomförd förstudie som undersöker möjligheten med en ny planeringsmetodik dvs. Virtuell Produktions Planering (VPP). Avsikten med planeringsmetodiken är att få olika delaktiga aktörer i projektet att samarbeta och utnyttja varandras kunskap och erfarenheter genom att gemensamt virtuellt bygga och planera produktionen av byggobjektet innan det verkställs i verklig produktion. VPP utnyttjar 3D-visualisering (interaktiv visualisering/Virtual Reality) och BIM-modellen under denna process. Arbetsordningen för denna planeringsprocess är följande:1.BIM-modell och dess komponenter från projektering grupperas efter yrkesgrupper dvs. vem som har ansvaret att installera/bygga dessa under byggproduktionen.2.De olika ansvariga yrkesgrupperna får sina tilldelade komponenter som de tid- och resurssätter. 3.Modellen och dess komponenter byggs sedan ihop i rätt ordning gemensamt av de olika involverade yrkesgrupperna och resultatet är en tidplan som visualiseras i 4D.Vad denna förstudie rapporterar så finns stora möjligheter till en effektivare planeringsprocess med VPP. De framtagna VPP-prototyperna under förstudien har visat att det är tekniskt möjligt att implementera ett VPP-system. Vidare visade observationsstudien från en strukturplaneringsworkshop på utvecklingspotential av den befintliga processen. Observationsstudien visade även att denna typ av workshop ger bättre: • granskning och identifiering av felkällor i projekteringen• testning och granskning av byggbarhet av projektet• sammanförande av kunskap och erfarenheter från projektering och produktion• laganda och Team Building för projektet• gemensam målbild och målplanI slutändan skulle VPP med största sannolikhet tillföra ökad tillförlitlighet och effektivitet i produktionen.
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| 7. |
- Sangchoolie, Behrooz, et al.
(författare)
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A study of the impact of bit-flip errors on programs compiled with different optimization levels
- 2014
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Ingår i: Proceedings - 2014 10th European Dependable Computing Conference, EDCC 2014. - : IEEE Computer Society. - 9781479938032 ; , s. 146-157
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Konferensbidrag (refereegranskat)abstract
- In this paper we study the impact of compiler optimizations on the error sensitivity of twelve benchmark programs. We conducted extensive fault injection experiments where bit-flip errors were injected in instruction set architecture registers and main memory locations. The results show that the percentage of silent data corruptions (SDCs) in the output of the optimized programs is only marginally higher compare to that observed for the non-optimized programs. This suggests that compiler optimizations can be used in safety- and mission-critical systems without increasing the risk that the system produces undetected erroneous outputs. In addition, we investigate to what extent the source code implementation of a program affects the error sensitivity of a program. To this end, we perform experiments with five implementations of a bit count algorithm. In this investigation, we consider the impact of the implementation as well as compiler optimizations. The results of these experiments give valuable insights into how compiler optimizations can be used to reduce error sensitive of registers and main memory sections. They also show how sensitive locations requiring additional protection, e.g., by the use of software-based fault tolerance techniques, can be identified.
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| 8. |
- Sangchoolie, Behrooz, 1986, et al.
(författare)
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Benchmarking the Hardware Error Sensitivity of Machine Instructions
- 2013
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Ingår i: Proceedings of the 2013 IEEE Workshop on Silicon Errors in Logic - System Effects (SELSE 9).
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Konferensbidrag (refereegranskat)abstract
- This paper presents the results of an extensive fault injection study of the impact of processor faults that manifest as bit flip errors in instruction set architecture registers and main memory locations. The aim is to investigate if bit errors that propagate to the source registers or memory locations of a given class of machine instructions have a similar probability of generating undetected value failures (i.e., silent data corruptions) for different programs. The results show a fairly large variation in the error sensitivity over different programs for all classes of machine instructions, which indicates that the effectiveness of error mitigation techniques that target specific machine instructions may vary significantly for different programs.
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| 9. |
- Staudt, Matthias, 1977, et al.
(författare)
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Coupling of an erbium spin ensemble to a superconducting resonator
- 2012
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Ingår i: Journal of Physics B: Atomic, Molecular and Optical Physics. - : IOP Publishing. - 1361-6455 .- 0953-4075. ; 45:12, s. Art. no. 124019-
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Tidskriftsartikel (refereegranskat)abstract
- A quantum coherent interface between optical and microwave photons can be used as a basic building block within a future quantum information network. The interface is envisioned as an ensemble of rare-earth ions coupled to a superconducting resonator, allowing for coherent transfer between optical and microwave photons. Towards this end, we have realized a hybrid device coupling a Er3+-doped Y2SiO5 crystal in a superconducting coplanar waveguide cavity. We observe a collective spin coupling of 4 MHz and a spin linewidth of down to 75 MHz.
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| 10. |
- Strandroth, Johan, 1978, et al.
(författare)
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A New Method to Evaluate Future Impact of Vehicle Safety Technology in Sweden
- 2012
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Ingår i: SAE Technical Papers. - 400 Commonwealth Drive, Warrendale, PA, United States : SAE International. - 0148-7191 .- 2688-3627. ; 56, s. 497-509
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Tidskriftsartikel (refereegranskat)abstract
- In the design of a safe road transport system there is a need to better understand the safety challenges lying ahead. One way of doing that is to evaluate safety technology with retrospective analysis of crashes. However, by using retrospective data there is the risk of adapting safety innovations to scenarios irrelevant in the future. Also, challenges arise as safety interventions do not act alone but are rather interacting components in a complex road transport system. The objective of this study was therefore to facilitate the prioritizing of road safety measures by developing and applying a new method to consider possible impact of future vehicle safety technology. The key point was to project the chain of events leading to a crash today into the crashes for a given time in the future. Assumptions on implementation on safety technologies were made and these assumptions were applied on the crashes of today. It was estimated which crashes would be prevented and the residual was analyzed to identify the characteristics of future crashes. The Swedish Transport Administration's in-depth studies of fatal crashes from 2010 involving car passengers (n=156) were used. This study estimated that the number of killed car occupant would be reduced with 53 percent from the year 2010 to 2020. Through this new method, valuable information regarding the characteristic of the future crashes was found. The results of this study showed that it was possible to evaluate future impact of vehicle safety technology if detailed and representative crash data is available.
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