| 1. |
- Abedan Kondori, Farid, et al.
(författare)
-
3D head pose estimation using the Kinect
- 2011
-
Ingår i: 2011 International Conference on Wireless Communications and Signal Processing (WCSP). - : IEEE Press. ; , s. 1-4
-
Konferensbidrag (refereegranskat)abstract
- Head pose estimation plays an essential role for bridging the information gap between humans and computers. Conventional head pose estimation methods are mostly done in images captured by cameras. However accurate and robust pose estimation is often problematic. In this paper we present an algorithm for recovering the six degrees of freedom (DOF) of motion of a head from a sequence of range images taken by the Microsoft Kinect for Xbox 360. The proposed algorithm utilizes a least-squares minimization of the difference between the measured rate of change of depth at a point and the rate predicted by the depth rate constraint equation. We segment the human head from its surroundings and background, and then we estimate the head motion. Our system has the capability to recover the six DOF of the head motion of multiple people in one image. The proposed system is evaluated in our lab and presents superior results.
|
|
| 2. |
|
|
| 3. |
- Abedan Kondori, Farid, et al.
(författare)
-
Real 3D interaction behind mobile phones for augmented environments
- 2011
-
Ingår i: 2011 IEEE International Conference on Multimedia and Expo (ICME). - : IEEE conference proceedings. - 9781612843490 - 9781612843483 ; , s. 1-6
-
Konferensbidrag (refereegranskat)abstract
- Number of mobile devices such as mobile phones or PDAs has been dramatically increased over the recent years. New mobile devices are equipped with integrated cameras and large displays which make the interaction with device easier and more efficient. Although most of the previous works on interaction between humans and mobile devices are based on 2D touch-screen displays, camera-based interaction opens a new way to manipulate in 3D space behind the device in the camera's field of view. This paper suggests the use of particular patterns from local orientation of the image called Rotational Symmetries to detect and localize human gesture. Relative rotation and translation of human gesture between consecutive frames are estimated by means of extracting stable features. Consequently, this information can be used to facilitate the 3D manipulation of virtual objects in various applications in mobile devices.
|
|
| 4. |
- Abedan Kondori, Farid, et al.
(författare)
-
Smart Baggage in Aviation
- 2011
-
Ingår i: 2011 IEEE International Conferences on Internet of Things, and Cyber, Physical and Social Computing. - Los Alamitos : IEEE Press. - 9781457719769 ; , s. 620-623
-
Konferensbidrag (refereegranskat)abstract
- Nowadays, the Internet has dramatically changed the way people take the normal course of actions. By the recent growth of the Internet, connecting different objects to users through mobile phones and computers is no longer a dream. Aviation industry is one of the areas which have a strong potential to benefit from the Internet of Things. Among many problems related to air travel, delayed and lost luggage are the most common and irritating. Therefore, this paper suggests anew baggage control system, where users can simply track their baggage at the airport to avoid losing them. Attaching a particular pattern on the bag, which can be detected and localized from long distance by an ordinary camera, users are able to track their baggage. The proposed system is much cheaper than previous implementations and does not require sophisticated equipment.
|
|
| 5. |
- Baker-Austin, Craig, et al.
(författare)
-
Biofilm development in the extremely acidophilic archaeon 'Ferroplasma acidarmanus' Fer1
- 2010
-
Ingår i: Extremophiles. - : Springer. - 1431-0651 .- 1433-4909. ; 14:6, s. 485-491
-
Tidskriftsartikel (refereegranskat)abstract
- 'Ferroplasma acidarmanus' Fer1 is an ironoxidizing extreme acidophile isolated from the Iron Mountain mine, California, USA This archaeon is predominantly found in biofilm-associated structures in the environment, and produces two distinct biofilm morphologies Bioinformatic analysis of the acidarmanus' Fer1 genome Identified genes annotated as involved in attachment and biofilm formation No putative quorum sensing signaling genes were identified and no N-acyl homoserine lactone-like compounds were found in acidarmanus' Fer1 biofilm supernatant Scanning confocal microscopy analysis of biofilm development on the surface of pyrite demonstrated the temporal and spatial development of biofilm growth Furthermore, two-dimensional polyacrylamide gel electrophoresis was used to examine differential protein expression patterns between biofilm and planktonic populations Ten up-regulated proteins were identified that included six enzymes associated with anaerobic growth, suggesting that the dominating phenotype in the mature biofilm was associated with anaerobic modes of growth This report increases our knowledge of the genetic and proteomic basis of biofilm formation in an extreme acidophilic archaeon.
|
|
| 6. |
- Berg, Katarina, et al.
(författare)
-
Psychometric evaluation of the post-discharge surgical recovery scale
- 2010
-
Ingår i: Journal of Evaluation In Clinical Practice. - : Blackwell Publishing Ltd. - 1356-1294 .- 1365-2753. ; 16:4, s. 794-801
-
Tidskriftsartikel (refereegranskat)abstract
- Rationale, aim and objectives Day surgery patients are discharged after a short period of postoperative surveillance, and reliable and valid instruments for assessment at home are needed. The aim of this study was to evaluate the psychometric properties of a Swedish version of the post-discharge surgical recovery (PSR) scale, an instrument to monitor the patients recovery after day surgery, in terms of data quality, internal consistency, dimensionality and responsiveness. Methods Data were collected on postoperative days 1 and 14 and included 525 patients. Data quality and internal consistency were evaluated using descriptive statistics, correlation analyses and Cronbachs alpha. The dimensionality of the scale was determined through an exploratory factor analysis. Responsiveness was evaluated using the standardized response mean and the area under the receiver operating characteristics curve (AUC). The correlation between change score in PSR and change score in self-rated health was assessed using Pearsons correlation coefficient. Patients ability to work and their self-rated health on postoperative day 14 were used as external indicators of change. Results Six items showed floor or ceiling effects. Cronbachs coefficient alpha was 0.90 and the average inter-item correlation coefficient was 0.44 after the deletion of two items. The items were closely related to each other, and a one-factor solution was decided on. A robust ability to detect changes in recovery (standardized response mean = 1.14) was shown. The AUC for the entire scale was 0.60. When initial PSR scores were categorized into three intervals, the ability to detect improved and non-improved patients varied (AUC 0.58-0.81). There was a strong correlation between change scores in PSR and health (0.63). Conclusions The Swedish version of the PSR scale demonstrates acceptable psychometric properties of data quality, internal consistency, dimensionality and responsiveness. In addition to previous findings, these results strengthen the PSR scale as a potential instrument of recovery at home.
|
|
| 7. |
- Bijmans, MFM, et al.
(författare)
-
Sulfate reduction at pH 4.0 for treatment of process and wastewaters
- 2010
-
Ingår i: Biotechnology progress (Print). - : Wiley. - 8756-7938 .- 1520-6033. ; 26:4, s. 1029-1037
-
Tidskriftsartikel (refereegranskat)abstract
- Acidic industrial process and wastewaters often contain high sulfate and metal concentrations and their direct biological treatment is thus far not possible as biological processes at pH < 5 have been neglected. Sulfate-reducing bacteria convert sulfate to sulfide that can subsequently be used to recover metals as metal-sulfides precipitate. This study reports on high-rate sulfate reduction with a mixed microbial community at pH 4.0 and 4.5 with hydrogen and/or formate as electron donors. The maximum sulfate reducing activity at pH 4.0 was sustained for over 40 days with a specific activity 500-fold greater than previously reported values: 151 mmol sulfate reduced/L reactor liquid per day with a maximum specific activity of 84 mmol sulfate per gram of volatile suspended solids per day. The biomass yield gradually decreased from 38 to 0.4 g volatile suspended solids per kilogram of sulfate when decreasing the reactor pH from pH 6 to 4. The microorganisms had a high maintenance requirement probably due maintaining pH homeostasis and the toxicity of sulfide at low pH. The microbial community diversity in the pH 4.0 membrane bioreactor decreased over time, while the diversity of the sulfate reducing community increased. Thus, a specialized microbial community containing a lower proportion of microorganisms capable of activity at pH 4 developed in the reactor compared with those present at the start of the experiment. The 16S rRNA genes identified from the pH 4.0 grown mixed culture were most similar to those of Desulfovibrio species and Desulfosporosinus sp. M1. (C) 2010 American Institute of Chemical Engineers Biotechnol. Prog., 26: 1029-1037, 2010
|
|
| 8. |
- Bonnedahl, Jonas, et al.
(författare)
-
Characterization, and comparison, of human clinical and black-headed gull (Larus ridibundus) extended-spectrum beta-lactamase-producing bacterial isolates from Kalmar, on the southeast coast of Sweden
- 2010
-
Ingår i: Journal of Antimicrobial Chemotherapy. - : Oxford University Press (OUP). - 0305-7453 .- 1460-2091. ; 65:9, s. 1939-1944
-
Tidskriftsartikel (refereegranskat)abstract
- Antibiotic resistance is one of the great challenges for modern healthcare. In Gram-negative bacteria, CTX-M-type extended-spectrum beta-lactamases (ESBLs) have been rapidly spreading through Europe since the early 2000s. In Sweden, ESBL-producing Escherichia coli are still rare, but a 3-fold increase has been seen from 2004 to 2007. Enterobacteria and normal flora of wild animals, with or without antibiotic resistance traits, constitute a potential source of human infection and colonization. We studied wild birds with the aim to understand the environmental dissemination of antibiotic resistance and, focusing on clinically relevant resistance types, we made comparisons with human clinical samples. In this study, ESBL-producing human clinical isolates and isolates from juvenile black-headed gulls from Kalmar County hospital and the city of Kalmar, respectively, on the southeast coast of Sweden, were characterized and compared. Despite a low frequency of antibiotic resistance among the isolates from gulls, ESBL-producing E. coli isolates were found, two with bla(CTX-M-14) and one with bla(CTX-M-15). The same CTX-M types were dominant among human ESBL isolates. In addition, gull isolates were dispersed among the human samples in the PhenePlate (TM) clustering system, indicating that they neither differ from the human isolates nor form any separate clonal clustering. The finding of CTX-M-type ESBLs in E. coli isolated from black-headed gulls in Sweden, where 'background resistance' is low, is consistent with an ongoing environmental spread of these plasmid-borne resistance genes. The results indicate that a potential for transfer between the human population and environment exists even in countries with a low level of antibiotic resistance.
|
|
| 9. |
- Bratteteig, Tone, et al.
(författare)
-
Research practices in digital design
- 2010
-
Ingår i: Exploring digital design. - London : Springer London. - 9781849962223 - 9781849962230 ; , s. 17-54
-
Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- In the twenty-first century, we are literally surrounded by digital things and things that turn out to be digital – or have some digital parts or are parts of a larger system in which there are digital elements. We carry around mobile phones and watches; many also have additional music players, PDAs or PCs. We live in houses filled with digital networks and artefacts; we depend on infrastructures that are partly digital and have digital systems attached to them; we use public and private services that are digital, are based on digital infrastructures and have other digital systems attached to them; and we experience embedded, ubiquitous computing as we live in digitally enhanced environments that support our activities with or without our conscious control. The digital layer(s) in the world constitute a real world.
|
|
| 10. |
- Brutemark, Andreas, et al.
(författare)
-
Role of mixotrophy and light for growth and survival of the toxic haptophyte Prymnesium parvum
- 2011
-
Ingår i: Harmful Algae. - : Elsevier BV. - 1568-9883 .- 1878-1470. ; 10, s. 388-394
-
Tidskriftsartikel (refereegranskat)abstract
- Mixotrophy in Prymnesium parvum was investigated using carbon (δ13C) and nitrogen (δ15N) stable isotopes. The experiment was performed in light and dark. In the dark treatment we expected that the mixotrophic P. parvum would rely solely on its prey and therefore reflect the prey isotopic signatures. In the light treatment P. parvum can perform photosynthesis as well as utilize its prey, thus we expect the isotopic signatures to be between the dark mixed cultures and the monocultures, depending on how much prey was utilized. In the light treatment, addition of the ciliate Myrionecta rubra resulted in higher P. parvum cell numbers compared to monocultures. During the experiment, cell numbers in the dark monocultures and the mixed dark cultures did not increase. P. parvum had 2.5-3 times higher cellular phosphorus and nitrogen content in the dark compared to the cultures in the light whereas no difference in carbon content between treatments could be observed. This suggests that P. parvum can utilize nitrogen and phosphorus but not carbon in the dark. It thus seems as if P. parvum relies on photosynthesis to meet the carbon and energy demand required for growth. The expected isotopic signatures “become what you eat…plus a few per mil” were not observed. In the dark treatment, the δ13C did not differ between monocultures and mixed cultures. In the light treatments P. parvum δ13C became less negative then the corresponding dark treatments indicating that P. parvum used CO2 rather than carbon from the added prey. No difference in δ15N between monocultures and mixed cultures could be observed during the experiment. We argue that light is necessary for P. parvum growth and that the ability to utilize nutrients originating from their prey may be important in bloom formation.
|
|
