| 1. |
- Dahm, Christina C., et al.
(författare)
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Fatty acid patterns and risk of prostate cancer in a case-control study nested within the European Prospective Investigation into Cancer and Nutrition
- 2012
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Ingår i: American Journal of Clinical Nutrition. - : Elsevier BV. - 0002-9165 .- 1938-3207. ; 96:6, s. 1354-1361
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Tidskriftsartikel (refereegranskat)abstract
- Background: Fatty acids in blood may be related to the risk of prostate cancer, but epidemiologic evidence is inconsistent. Blood fatty acids are correlated through shared food sources and common endogenous desaturation and elongation pathways. Studies of individual fatty acids cannot take this into account, but pattern analysis can. Treelet transform (TT) is a novel method that uses data correlation structures to derive sparse factors that explain variation. Objective: The objective was to gain further insight in the association between plasma fatty acids and risk of prostate cancer by applying TT to take data correlations into account. Design: We reanalyzed previously published data from a case-control study of prostate cancer nested within the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort. TT was used to derive factors explaining the variation in 26 plasma phospholipid fatty acids of 962 incident prostate cancer cases matched to 1061 controls. Multiple imputation was used to deal with missing data in covariates. ORs of prostate cancer according to factor scores were determined by using multivariable conditional logistic regression. Results: Four simple factors explained 38% of the variation in plasma fatty acids. A high score on a factor reflecting a long-chain n-3 PUFA pattern was associated with greater risk of prostate cancer (OR for highest compared with lowest quintile: 1.36; 95% CI: 0.99, 1.86; P-trend = 0.041). Conclusion: Pattern analyses using TT groupings of correlated fatty acids indicate that intake or metabolism of long-chain n-3 PUFAs may be relevant to prostate cancer etiology. Am J Clin Nutr 2012;96:1354-61.
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| 2. |
- Fahlquist, Karin, et al.
(författare)
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Human animal machine interaction : Animal behavior awareness and digital experience
- 2010
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Ingår i: Proceedings of ACM Multimedia 2010 - Brave New Ideas, 25-29 October 2010, Firenze, Italy.. - New York, NY, USA : ACM. - 9781605589336 ; , s. 1269-1274
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Konferensbidrag (refereegranskat)abstract
- This paper proposes an intuitive wireless sensor/actuator based communication network for human animal interaction for a digital zoo. In order to enhance effective observation and control over wild life, we have built a wireless sensor network. 25 video transmitting nodes are installed for animal behavior observation and experimental vibrotactile collars have been designed for effective control in an animal park. The goal of our research is two-folded. Firstly, to provide an interaction between digital users and animals, and monitor the animal behavior for safety purposes. Secondly, we investigate how animals can be controlled or trained based on vibrotactile stimuli instead of electric stimuli. We have designed a multimedia sensor network for human animal machine interaction. We have evaluated the effect of human animal machine state communication model in field experiments.
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| 3. |
- Karlsson, Johannes, 1977-, et al.
(författare)
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Applications of wireless visual sensor networks : the digital zoo
- 2010
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Ingår i: Visual information processing in wireless sensor networks. - : IGI Global.
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- In this chapter we will describe our work to set up a large scale wireless visual sensor network in a Swedish zoo. It is located close to the Arctic Circle making the environment very hard for this type of deployment. The goal is to make the zoo digitally enhanced, leading to a more attractive and interactive zoo. To reach this goal the sensed data will be processed and semantic information will be used to support interaction design, which is a key component to provide a new type of experience for the visitors. In this chapter we will describe our research work related to the various aspects of a digital zoo
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| 4. |
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| 5. |
- Karlsson, Johannes, et al.
(författare)
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Demonstration of Wyner-Ziv video compression in a wireless camera sensor network
- 2009
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Ingår i: The Sixth Swedish National Computer Networking Workshop and Ninth Scandinavian Workshop on Wireless Adhoc Networks (SNCNW+Adhoc 2009).
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Wyner-Ziv video coding can provide low complexity encoding and high complexity decoding and is therefore a promising approach for video coding in wireless sensor networks. We will demonstrate our practical implementation of a wyner-ziv video codec. The hardware platform used in our camera sensor network is the Fleck camera developed by CSIRO ASL in Brisbane, Australia.
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| 6. |
- Karlsson, Johannes, 1977-, et al.
(författare)
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Demonstration of Wyner-Ziv video compression in a wireless camera sensor network
- 2009
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Ingår i: The 9th Scandinavian Workshop on Wireless Ad-hoc & Sensor Networks (ADHOC'09 ). 4-5 May 2009, Uppsala, Sweden.. - Uppsala.
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Konferensbidrag (refereegranskat)abstract
- Sending video over wireless sensor networks is a challenging task. The encoding and transmission of video is very resource hungry and the sensor nodes have very limited resources in terms of communication bandwidth,memory, computation and typically 5-10 times. In this paper we will present a practical implementation of a Wyner-Ziv video codec where the reversed asymmetry in complexity between encoder and decoder can be achieved. We will also present our sensor network platform used in this demonstration known as Fleck TM-3 as well as two different co-processor daughterboards for image processing. The different daughterboards are then compared in terms of speed and energy consumption.
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| 7. |
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| 8. |
- Karlsson, Johannes, 1977-, et al.
(författare)
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The digital zoo : a testbed for wireless video sensor networks
- 2011
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Konferensbidrag (refereegranskat)abstract
- In this paper we describe our work on building a large scale testbed for wireless video sensor networks. The site for this testbed is a zoo located in north Sweden, Lycksele djurpark. The zoo covers an area of about 47 hectares and is home to more than 400 animals, divided into 30 spieces. This gives us the possibility to build a large scale deployment rich of events to detect. The site is located in nothern Sweden where the winters are dark and cold and the summers have a lot of sunshine. This is an challanging environment for the sensor network deployment where the solar powered sensor nodes needs to be highly adaptive.
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| 9. |
- Wark, Tim, et al.
(författare)
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Real-time image streaming over a low-bandwidth wireless camera network
- 2007
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Ingår i: Proceedings of the Third International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP 2007). 3-6 December 2007, Melbourne, Australia.. ; , s. 113-118
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Konferensbidrag (refereegranskat)abstract
- In this paper we describe the recent development of a low- bandwidth wireless camera sensor network. We propose a simple, yet effective, network architecture which allows multiple cameras to be connected to the network and synchronize their communication schedules. Image compression of greater than 90% is performed at each node running on a local DSP coprocessor, resulting in nodes using 1/8th the energy compared to streaming uncompressed images. We briefly introduce the Fleck wireless node and the DSP/camera sensor, and then outline the network architecture and compression algorithm. The system is able to stream color QVGA images over the network to a base station at up to 2 frames per second.
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