| 61. |
- Aamir, Syed Ahmed, 1980-, et al.
(författare)
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A 1.2-V pseudo-differential OTA with common-mode feedforward in 65-nm CMOS
- 2010
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Ingår i: Proceedings of the 17th IEEE International Conference on Electronics, Circuits, and Systems. - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 29-32
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Konferensbidrag (refereegranskat)abstract
- In this work, we describe the implementation of a 1. 2-V pseudo-differential operational transconductance amplifier (OTA) with common-mode feedforward (CMFF) and inherent common-mode feedback (CMFB) in a 65-nm, digital CMOS process. The OTA architecture provides an inherent CMFB when cascaded OTA structures are utilized andthis work has studied a cascaded amplifier consisting of fourstages. Due to the low-gain using core 65-nm circuit devices, the overall gain must be distributed on all four stages to acquire a gain of more than 60 dB, while maintaining a-3-dB bandwidth of 200 MHz. To achieve high gain, we propose using a modified, positive-feedback, cross-coupled input differential stage. The modified OTA achieves a high output swing of ± 0.85 V due to only two stacked transistors, 88 dB DC gain and a third-order harmonic of -60 dB for 800 mVpp at 30 MHz. Further on, in a capacitive buffer configuration, we achieve a high slew rate of 1240 V/µS, -3-dB bandwidth of 509 MHz, signal-to-noise ratio of 63 dB while consuming 10.4 mW power.
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| 62. |
- Aamir, Syed Ahmed, 1980-, et al.
(författare)
-
A 500-MHz low-voltage programmable gain amplifier for HD video in 65-nm CMOS
- 2010
-
Ingår i: Proceedings of 28th IEEE Norchip Conference., NORCHIP'10. - Tampere : www.ieee.org. - 9781424489718 - 9781424489725 ; , s. 1-4
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Konferensbidrag (refereegranskat)abstract
- This work describes the implementation of a 1.2-V programmable gain amplifier (PGA) for high-definition (HD) video digitizers in a 65-nm digital CMOS process. The “pseudo” switched-capacitor (SC) PGA architecture buffers the video signal, without switching, during the active video. The SC circuitry is used for setup of DC operating point during horizontal and vertical blanking periods. Additionally, it compensates for the `sync-tip' of analog video signals to an equal blanking level for increased dynamic range to the digitizer following the PGA. The operational transconductance amplifier (OTA) employed as main amplifier in the PGA is a pseudo-differential, positive-feedback input stage architecture with a common-mode feedforward (CMFF) technique. The common-mode feedback (CMFB) is provided once two OTAs are cascaded. Schematic-level simulation results show that the OTA maintains a -3-dB bandwidth of 550 MHz, while keeping the distortion HD3 at -60 dB for a 30-MHz, 850 mVpp high definition video signal. The 88 dB DC gain is distributed among four OTA stages and the overall, combined PGA achieves a signal-to-noise ratio of 63 dB. Due to only two stacked transistors, it achieves high output swing of ±0.85 V, 1240 V/μs slew rate while consuming 10.4 mW power.
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| 63. |
- Aamodt, A., et al.
(författare)
-
Case-based reasoning for assessment and diagnosis of depression in palliative care
- 2010
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Ingår i: Proceedings - IEEE Symposium on Computer-Based Medical Systems. ; , s. 480-485
-
Konferensbidrag (refereegranskat)abstract
- The goal of the research presented is to create a computational framework and system architecture for clinical decision support in palliative care. The application focused is the classification of depression. The method under investigation is case-based reasoning, motivated by the complexity of the domain and a lack of generalized principles of sufficient coverage and strength for diagnosis and treatment. A system architecture is described and exemplified through an implemented prototype. The outcome of the research so far is a system that captures the properties intended, and for which a clinical test set-up has been defined. © 2010 IEEE.
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| 64. |
- Aamodt, Edvard, et al.
(författare)
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LEARNING FROM FIRE INCIDENTS : Analysis of a devastating fire in a building with municipal housing in Norway
- 2022
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Ingår i: Proceedings of the 32nd European Safety and Reliability Conference (ESREL 2022). ; , s. 1156-
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Konferensbidrag (refereegranskat)abstract
- This article presents an analysis of a fire in a municipal apartment building used as housing for people with challenges connected to drug addiction. The fire took place in Norway 7th of August 2021. The incident happened during the night and the fire was spreading quickly and intensely via the external wooden balconies. The combination of risk factors both connected to the fire development and the characteristics of the occupants raises the potential for fire fatalities. This analysis seeks to understand why the fire spread with such a speed, and how everyone in the building survived without injuries. The analysis identified both technical and human factors that may help to answer these questions. The findings suggest that there were deficiencies connected to the technical fire safety design that if improved could have reduced the fire damage. Factors promoting the fire spread and fire intensity include the choice of wood material used in the construction of the balconies, no sprinkler system installed on the balconies and a large fire load on the balconies caused by the occupants’ tendency to accumulate possessions on the balconies. Factors contributing to the outcome of no injuries or fatalities included occupants being awake during these late hours, and the strong social network between them. Such a network should be seen as a positive factor regarding robustness against fire and should be encouraged.
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| 65. |
- Aamodt, K., et al.
(författare)
-
Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
- 2010
-
Ingår i: Journal of Instrumentation. - 1748-0221. ; 5
-
Konferensbidrag (refereegranskat)abstract
- ALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 mu m in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from proton-proton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10(5) charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.
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| 66. |
- Aangenendt, Gijs, et al.
(författare)
-
Curating a historical source corpus of 20th century patient organization periodicals.
- 2024
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Ingår i: Proceedings of the Huminfra Conference (HiC 2024).
-
Konferensbidrag (refereegranskat)abstract
- Acting out Disease: How Patient Organizations Shaped Modern Medicine (ActDisease) explores the history of patient organizations in 20th century Europe. By combining traditional historiographic methods with text mining techniques, the project aims to shed light on how patient organizations co-constructed concepts of and management of disease. Part of the project is to digitize print sources and build a digital corpus for historical text mining. The corpus consists of periodical publications from selected British, French, German and Swedish patient organizations, a type of material that poses a number of challenges in scan quality, layout, and lack of consistency. This paper discusses the technical process of building the ActDisease corpus from digitizing patient organization periodicals to OCR post-processing. It touches upon the methodological questions and challenges of curating a corpus of fragmented and heterogeneous historical source material tailored to a specific project.
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| 67. |
- Aapaoja, Aki, et al.
(författare)
-
MaaS service combinations for different geographical areas
- 2017
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Ingår i: 24th World Congress on Intelligent Transportation Systems, Montreal, October 29-November 2, 2017.
-
Konferensbidrag (refereegranskat)abstract
- A more efficient use of transport in urban areas and promoting a more sustainable way of living along with ever-accelerating urbanization and digitalization are the main drivers for MaaS. MaaS is needed to solve mobility challenges in cities and new business and service concepts can be easily tested in more densely populated environments first. However, a huge number of people with various demands for mobility services live in smaller communities and rural areas where the availability of and accessibility to mobility services is usually entirely different and more limited than in urban areas. In this paper, MaaS service combinations for four different contexts and geographic areas are identified: 1) MaaS in urban areas; 2) MaaS in suburban areas; 3) MaaS in rural areas; and 4) national and international MaaS. The characteristics of MaaS services in these different geographical areas regarding objectives and included services are also presented.
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| 68. |
- Aare, Kätlin, et al.
(författare)
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Backchannels and breathing
- 2014
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Ingår i: Proceedings from FONETIK 2014. - Stockholm : Department of Linguistics, Stockholm University. - 9789163756627 - 9789163756634 ; , s. 47-52
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The present study investigated the timing of backchannel onsets within speaker’s own and dialogue partner’s breathing cycle in two spontaneous conversations in Estonian. Results indicate that backchannels are mainly produced near the beginning, but also in the second half of the speaker’s exhalation phase. A similar tendency was observed in short non-backchannel utterances, indicating that timing of backchannels might be determined by their duration rather than their pragmatic function. By contrast, longer non-backchannel utterances were initiated almost exclusively right at the beginning of the exhalation. As expected, backchannels in the conversation partner’s breathing cycle occurred predominantly towards the end of the exhalation or at the beginning of the inhalation.
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| 69. |
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| 70. |
- Aare, Kätlin, et al.
(författare)
-
Creak in the respiratory cycle
- 2018
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Ingår i: Proceedings of Interspeech 2018. - : The International Speech Communication Association (ISCA). ; , s. 1408-1412
-
Konferensbidrag (refereegranskat)abstract
- Creakiness is a well-known turn-taking cue and has been observed to systematically accompany phrase and turn ends in several languages. In Estonian, creaky voice is frequently used by all speakers without any obvious evidence for its systematic use as a turn-taking cue. Rather, it signals a lack of prominence and is favored by lengthening and later timing in phrases. In this paper, we analyze the occurrence of creak with respect to properties of the respiratory cycle. We show that creak is more likely to accompany longer exhalations. Furthermore, the results suggest there is little difference in lung volume values regardless of the presence of creak, indicating that creaky voice might be employed to preserve air over the course of longer utterances. We discuss the results in connection to processes of speech planning in spontaneous speech.
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