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- Agarwal, PK, et al.
(författare)
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Box-trees and R-trees with near-optimal query time
- 2002
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Ingår i: Discrete & Computational Geometry. - : Springer Science and Business Media LLC. - 0179-5376 .- 1432-0444. ; 28:3, s. 291-312
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Tidskriftsartikel (refereegranskat)abstract
- A box-tree is a bounding-volume hierarchy that uses axis-aligned boxes as bounding volumes. The query complexity of a box-tree with respect to a given type of query is the maximum number of nodes visited when answering such a query. We describe several new algorithms for constructing box-trees with small worst-case query complexity with respect to queries with axis-parallel boxes and with points. We also prove lower bounds on the Worst-case query complexity for box-trees, which show that our results are optimal or close to optimal. Finally, we present algorithms to convert box-trees to R-trees, resulting in R-trees with (almost) optimal query complexity.
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| 2. |
- Johansson, Klas, et al.
(författare)
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Integrating User Deployed Local Access Points in a Mobile Operator´s Network
- 2004
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Konferensbidrag (refereegranskat)abstract
- A concept is outlined for how privately deployed local access points can be integrated in a mobile operator's network. By letting the users deploy multi-radio access points, reusing already installed broadband for `last-mile'-access, we can expect significant cost savings in particular for high data rate services with low QoS requirements. The concept is presented both from a technical perspective as well as from a business point of view, where the network franchise model is introduced.
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| 3. |
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| 4. |
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| 5. |
- Postgård, Per, et al.
(författare)
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Stunning of iodide transport by (131)I irradiation in cultured thyroid epithelial cells.
- 2002
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Ingår i: Journal of nuclear medicine : official publication, Society of Nuclear Medicine. - 0161-5505. ; 43:6, s. 828-34
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Tidskriftsartikel (refereegranskat)abstract
- The existence of thyroid stunning (i.e., inhibited thyroidal iodide uptake after administration of diagnostic amounts of (131)I) is controversial and is currently a subject of debate. To our knowledge, the stunning phenomenon has not been investigated previously in vitro. METHODS: Growth-arrested porcine thyroid cells that formed a tight and polarized monolayer in a bicameral chamber were irradiated with 3-80 Gy (131)I present in the surrounding culture medium for 48 h. The iodide transport capacity after irradiation was evaluated 3 d later by measuring the transepithelial (basal to apical) flux of trace amounts of (125)I. RESULTS: The basal-to-apical (125)I transport decreased with increasing absorbed dose acquired from (131)I; a nearly 50% reduction was observed already at 3 Gy. Stable iodide at the same molarity as (131)I (10(-8) mol/L) had no effect on the (125)I transport. Cell number and epithelial integrity were not affected by irradiation. CONCLUSION: Stunning of iodide transport is detected after (131)I irradiation of cultured thyroid cells. The degree of inhibition of transport is dependent on the absorbed dose.
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