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- Fukui, Kazuhiro, et al.
(author)
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Difference subspace and its generalization for subspace-based methods
- 2015
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In: IEEE Transactions on Pattern Analysis and Machine Intelligence. - 0162-8828 .- 1939-3539. ; 37:11, s. 2164-2177
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Journal article (peer-reviewed)abstract
- Subspace-based methods are known to provide a practical solution for image set-based object recognition. Based on the insight that local shape differences between objects offer a sensitive cue for recognition, this paper addresses the problem of extracting a subspace representing the difference components between class subspaces generated from each set of object images independently of each other. We first introduce the difference subspace (DS), a novel geometric concept between two subspaces as an extension of a difference vector between two vectors, and describe its effectiveness in analyzing shape differences. We then generalize it to the generalized difference subspace (GDS) for multi-class subspaces, and show the benefit of applying this to subspace and mutual subspace methods, in terms of recognition capability. Furthermore, we extend these methods to kernel DS (KDS) and kernel GDS (KGDS) by a nonlinear kernel mapping to deal with cases involving larger changes in viewing direction. In summary, the contributions of this paper are as follows: 1) a DS/KDS between two class subspaces characterizes shape differences between the two respectively corresponding objects, 2) the projection of an input vector onto a DS/KDS realizes selective visualization of shape differences between objects, and 3) the projection of an input vector or subspace onto a GDS/KGDS is extremely effective at extracting differences between multiple subspaces, and therefore improves object recognition performance. We demonstrate validity through shape analysis on synthetic and real images of 3D objects as well as extensive comparison of performance on classification tests with several related methods; we study the performance in face image classification on the Yale face database B+ and the CMU Multi-PIE database, and hand shape classification of multi-view images.
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- Brauckhoff, M., et al.
(author)
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Limitations of intraoperative adrenal remnant volume measurement in patients undergoing subtotal adrenalectomy
- 2008
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In: World Journal of Surgery. - : Springer Science and Business Media LLC. - 0364-2313 .- 1432-2323. ; 32:5, s. 863-872
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Journal article (peer-reviewed)abstract
- Background: Recent studies have shown that a minimum of approximately one-third of one normal adrenal gland is required for sufficient adrenocortical stress capacity. Correlation between intraoperative measurement, determination of remnant size by computed tomography (CT), and adrenocortical stress capacity has not been examined so far. Methods: Twenty-two patients with familial pheochromocytoma (n = 13), sporadic pheochromocytoma (n = 3), and adrenocortical tumors (n = 6) who underwent unilateral or bilateral subtotal adrenalectomy (STAE, 28 adrenal remnants) were prospectively studied. Patients were examined in a multi-slice CT to determine residual adrenal tissue and by ACTH test 4 days and 3 months postoperatively. Results: There was a slight significant correlation between intraoperative and CT calculated volumes (r = 0.77, p < 0.001). However, volumes assessed by CT were almost doubled compared with intraoperative determination (p < 0.001). Although recovery of adrenal function could be observed, no significant changes of remnant volumes could be detected within 3 months. In patients with familial pheochromocytoma, there was a significant correlation between residual adrenal volume and stimulated cortisol levels (P < 0.001). A distinct minimum of adrenal volume for intact adrenocortical stress capacity could not be exactly determined, however, in one patient with only 10% residual adrenal tissue intact stress capacity was found. Conclusions: Residual adrenal tissue of approximately 10-15% offers intact stress capacity. However, an exact determination of the size of an adrenal remnant after STAE has limitations. CT gives larger volumes compared with intraoperative determination. For calculation of a volume-function correlation of residual adrenal tissue, in clinical practice, the determination of relative adrenal residual volume is acceptable. © 2008 Société Internationale de Chirurgie.
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- Krantz, Gunnar
(author)
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The hitchhikers guide to post-war Europe : Re-enacting travels on paper
- 2019
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Conference paper (other academic/artistic)abstract
- The hitchhikers guide to post-war EuropeRe-enactments on paper Hitchhiking is “an Americas contribution to world civilization which has been largely unexamined by historians” (Schlebecker 1957, 305). Dependent on automobile transportation it originated in the U. S., increased during the great depression and spread throughout Europe after the second world war, possibly inspired by American soldiers. (ibid, 321). In the early 50s begging for rides in Europe became popular among people looking for adventure and freedom. “Students, idealists, ex-soldiers and boy-scouts” as Hassner put it (1953, 28), travelled along routes that were often defined by a network of affordable youth-hostel where the travelers could make new acquaintances and meet friends along the way. In 1951 my father, then 19 years old went out on the road for the first time. His meticulously written diary, photographs and stamps in his passport tells the story of a young man thumbing his way through Germany, still in ruins, to a small island near Cannes where a group of mostly young people had formed a kind of collective. It also tells us something about both drivers and hitchhikers, were they came from and their occupations and motifs.To better understand my father’s experiences, I decided to edit his archival material by combining maps of each days route with selected excerpts from diaries and photographs on a chronological timeline. What I soon found out was that the result of this treatment became rather uninteresting and did not convey neither the sense of adventure nor the interaction with hitchhikers, drivers and locals. By creating (drawn) characters and using excerpts from the diary where action, interaction or reflection took place as script for additional comics pages, another narrative layer was added to the timeline, hence resulting in a fuller, more communicative story. Except from Schlebeckers article, published in 1958 (one year after Kerouac’s On the Road) to my knowledge, little is to be found on the history of hitchhiking, especially regarding these early years in Europe.The presentation focus on how the additional comics pages (the second layer of narration) which for the most part lacked photographic references, were made and how they might have helped to form a better understanding of this history.Link to the comic: Cykelfärden som blev en lift 1951 (in Swedish): http://www.seriekonst.se/?page_id=1709
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- Aad, G., et al.
(author)
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- 2012
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swepub:Mat__t (peer-reviewed)
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- Galkin, Maxim V., et al.
(author)
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Mild Heterogeneous Palladium-Catalyzed Cleavage of beta-O-4 '-Ether Linkages of Lignin Model Compounds and Native Lignin in Air
- 2014
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In: ChemCatChem. - : Wiley. - 1867-3880 .- 1867-3899. ; 6:1, s. 179-184
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Journal article (peer-reviewed)abstract
- A mild and robust heterogeneous palladium-catalyzed CO bond cleavage of 2-aryloxy-1-arylethanols using formic acid as reducing agent in air was developed. The cleaved products were isolated in 92-98% yield; and by slightly varying the reaction conditions, a ketone, an alcohol, or an alkane can be generated in near-quantitative yield. This reaction is applicable to cleaving the -O-4-ether bond found in lignin polymers of different origin. The reaction was performed on a lignin polymer model to generate either the monomeric aryl ketone or alkane in a quantitative yield. Moderate depolymerization was achieved with native lignin at similar reaction conditions. Mechanistic studies under kinetic control indicate that an initial palladium-catalyzed dehydrogenation of the alcohol is followed by insertion of palladium to an enol equivalent. A palladium-formato complex reductively cleaves the palladium-enolate complex to generate the ketone.
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- Eriksson, Jonnie, 1978-, et al.
(author)
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Figures of Postwar Sliding : Utopia and Violence in the Extreme Sport Performances of James Bond
- 2020
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In: Social Sciences. - Basel : MDPI. - 2076-0760. ; 9:12
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Journal article (peer-reviewed)abstract
- This article investigates the utopian visions of extreme sports as a postwar phenomenon by contrasting it to the violence of the extreme sport practitioner par excellence in postwar/cold war cinema: James Bond. Continental philosophy and cultural studies furnish extreme sport as a manifold of wholesome, meaningful, sustainable, life-enhancing, and environmentally intimate practices, less orientated toward human rivalry than its traditional namesake. Certain attention is thus paid to the movement of sliding in extreme sports that thrive on powerful natural forces such as air, wind, snowy slopes, and big waves, creating an ambivalent field between mastery and letting oneself go. Sliding, or glissade, is treated as a “figure of thought” that Bond is mustered to embody and enact with his extreme athletic repertoire. The analysis of James Bond’s extreme sport sliding is contrasted to the musings of glissade philosophers such as Jean-Paul Sartre, Gilles Deleuze, and Michel Serres. It is concluded that if there is utopianism in James Bond’s extreme sport performances, it is in the sliding itself, while the attaining of that state is paved with violence towards everything material. The article reinforces the concept of the extreme in relation to sport as a processual tool, rather than a category describing a fixed set of characteristics adhering to a certain practice.© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
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