1,424 research outputs found
Interior-point methods for PDE-constrained optimization
No full textIn applied sciences PDEs model an extensive variety of phenomena. Typically the final goal of simulations is a system which is optimal in a certain sense. For instance optimal control problems identify a control to steer a system towards a desired state. Inverse problems seek PDE parameters which are most consistent with measurements. In these optimization problems PDEs appear as equality constraints. PDE-constrained optimization problems are large-scale and often nonconvex. Their numerical solution leads to large ill-conditioned linear systems. In many practical problems inequality constraints implement technical limitations or prior knowledge.
In this thesis interior-point (IP) methods are considered to solve nonconvex large-scale PDE-constrained optimization problems with inequality constraints. To cope with enormous fill-in of direct linear solvers, inexact search directions are allowed in an inexact interior-point (IIP) method. This thesis builds upon the IIP method proposed in [Curtis, Schenk, Wächter, SIAM Journal on Scientific Computing, 2010]. SMART tests cope with the lack of inertia information to control Hessian modification and also specify termination tests for the iterative linear solver.
The original IIP method needs to solve two sparse large-scale linear systems in each optimization step. This is improved to only a single linear system solution in most optimization steps. Within this improved IIP framework, two iterative linear solvers are evaluated: A general purpose algebraic multilevel incomplete L D L^T preconditioned SQMR method is applied to PDE-constrained optimization problems for optimal server room cooling in three space dimensions and to compute an ambient temperature for optimal cooling. The results show robustness and efficiency of the IIP method when compared with the exact IP method.
These advantages are even more evident for a reduced-space preconditioned (RSP) GMRES solver which takes advantage of the linear system's structure. This RSP-IIP method is studied on the basis of distributed and boundary control problems originating from superconductivity and from two-dimensional and three-dimensional parameter estimation problems in groundwater modeling. The numerical results exhibit the improved efficiency especially for multiple PDE constraints.
An inverse medium problem for the Helmholtz equation with pointwise box constraints is solved by IP methods. The ill-posedness of the problem is explored numerically and different regularization strategies are compared. The impact of box constraints and the importance of Hessian modification on the optimization algorithm is demonstrated. A real world seismic imaging problem is solved successfully by the RSP-IIP method
Berufliche Bildung aus wirtschaftspolitischer Sicht
No full textAusgehend von der aktuellen Diskussion über Bildung und der Forderung nach Verbesserung der Bildungsangebote spricht sich der Autor Erwin Huber (derzeit Bayerischer Staatsminister für Wirtschaft, Infrastruktur, Verkehr und Technologie) für eine Optimierung von Bildungsstrukturen und -methoden aus. Im Zusammenhang mit der beruflichen Bildung zeigt er Lösungsansätze auf und regt zu weiteren Diskussionen an. Die duale Berufsausbildung sieht er als „Erfolgsmodell“. Angesichts der Auswirkungen der Globalisierung und Internationalisierung betont er die Bedeutung von Aus- und Weiterbildung als „lebenslanges Lernen“. Schließlich listet er Beispiele und Projekte der Bayrischen Staatsregierung zur Förderung der beruflichen Bildung auf. (DIPF/ ssch
Writers Talk Featuring Sonya Huber
No full textSonya Huber, 2004 graduate of OSU's MFA Creative Writing Program, currently an assistant professor at Georgia Southern University. Author of "The Backwards Research Guide for Writers," "Opa Nobody," and most recently "Cover Me: A Health Insurance Memoir."The media can be accessed here: http://streaming.osu.edu/knowledgebank/cstw12/WT_WCRS_11-08-10_SonyaHuber.mp3Ohio State University. Center for the Study and Teaching of Writin
Odontocheila yunga Huber 1999
No full text28. Odontocheila yunga Huber, 1999 (Fig. 30) Odontocheila yunga: Pearson et al. 1999: 453; Cassola and Pearson 2001: 14; Erwin and Pearson 2008: 289. Distribution (Fig. 132).? Argentina (Jujuy), Bolivia (Tarija). Localities. ? Jujuy: (Erwin and Pearson 2008: 289). Remarks. No specimens known from Argentina as of yet.Published as part of Wiesner, Jürgen & Bandinelli, Aligi, 2014, Notes on the tiger beetles (Coleoptera: Cicindelidae) of Argentina. 117. Contribution towards the knowledge of Cicindelidae, pp. 1-66 in Insecta Mundi 2014 (377) on page 17, DOI: 10.5281/zenodo.517936
Mesabolivar huambisa Huber 2000
No full text<i>Mesabolivar huambisa</i> Huber, 2000 <p>Figs 5–6, 26–31, 42–47</p> <p> <i>Mesabolivar huambisa</i> Huber, 2000: 191, figs 738–747 (♂ ♀, Peru, Ecuador). [Machado 2007: 88; see Notes below].</p> <p> <b>Diagnosis.</b> Easily distinguished from similar congeners (<i>M. acrensis</i>, <i>M. maraba</i>, <i>M. pseudoblechroscelis</i>) by screw-shaped sclerite prolaterally on bulbal process (Figs 29–31); also by shape of procursus (Figs 26–28; distinctive distal elements) and by shape of epigynum (Figs 42–47; median cavity very wide, not reaching anterior epigynal margin; lateral pair of processes directed towards ventral) (female of <i>M. pseudoblechroscelis</i> unknown).</p> <p> <b>Type material.</b> PERU: <i>Loreto</i>: ♂ holotype, 21♂ 18♀ paratypes, MUSM, Rio Samiria (4°43’S, 74°18’W), v– vi.1990 (T. Erwin <i>et al.</i>), examined (Huber 2000; 1♂ 1♀ paratypes reexamined for present study).</p> <p> <b>Other material examined</b> (all assigned tentatively; see Notes below). BRAZIL: <i>Amazonas</i>: 3♂ 1♀, ZFMK (Ar 18950), forest near Tabatinga (4.244°S, 69.92– 69.93°W), 90 m a.s.l., 2–4.xi.2016 (B.A. Huber, L.S. Carvalho); 1♀ in pure ethanol, ZFMK (Br 16-321), same data.</p> <p> <i>Pará</i>: 2♂ (and 1♀ abdomen transferred from Br 16-226a), ZFMK (Ar 18951), Belém, Parque Estadual do Utinga, ‘site 1’ (1.424°S, 48.429°W), 25 m a.s.l., 6.x.2016 (B.A. Huber, L.S. Carvalho); 1♂ 1♀ (♀ abdomen transferred to ZFMK Ar 18951) in pure ethanol, ZFMK (Br 16-226a), same data.</p> <p> <b>Description</b> (amendments; see Huber 2000). Males and females with pair of small brown marks behind ocular area. Male clypeus swollen and with sclerotized rim as in putative close relatives; male palpal tarsus with some bent hairs, one of them thicker than others; ventral membranous structure on bulbal process highly expandable (Fig. 29); femur 3 thicker than other femora (reexamined ♂ paratype with tibia 1 length 12.0, diameters of femora at half length: 0.20, 0.22, 0.30, 0.20).</p> <p> <b>Natural history.</b> Both in Tabatinga and in Belém, the spiders were found on tree trunks, usually at about 0.5– 2 m above the ground. They built small domed webs with a diameter of only ~ 10–15 cm, with one side of the dome attached to the tree bark; here the spiders sat with the fontal side facing down. Males and females were sometimes seen to sit side by side.</p> <p> <b>Distribution.</b> Possibly widely distributed from Peru and Ecuador (maybe Bolivia) to the estuary of the Amazon River (Fig. 723), but see Notes below.</p> <p> <b>Notes.</b> The newly examined specimens differ slightly from the reexamined paratypes, but the significance of this variation is unclear. In males from Belém the tip of the procursus is less curved and the dorsal process is larger (Fig. 28); in males from both Belém and Tabatinga, the proximal part of the procursus is less curved ventrally (Figs 27, 28); in males from Belém, the screw-shaped sclerite on the bulbal process is smaller (Fig. 31); in females from both Belém and Tabatinga, the epigynal processes are more pointed (Figs 45, 47). In general, palps, chelicerae, and epigyna are smaller in specimens from both Belém and Tabatinga than in the paratypes, but sample sizes are small and leg length seems to be similar: tibia 1 in five newly examined males: 11.5–13.2 (mean 12.2); in one female: 6.7. Newly examined males tend to have thinner legs and less thickened femora 3 (diameters of femora at halflength in one male: 0.17, 0.18, 0.20, 0.17).</p> <p> The specimens from Brazil (Acre) and Bolivia assigned to <i>M. huambisa</i> in Machado (2007) are also problematic. They were later considered to represent two new undescribed species (Machado 2011, “sp. 05” and “sp. 09”), but the drawings (I did not examine the specimens) of the Bolivian specimens strongly resemble the specimens from Belém.</p> <p>In sum, species limits appear difficult to establish in this group, and future studies should aim at large scale geographic sampling and inclusion of molecular data.</p> <p>In the original description of the female internal genitalia, “large membranous structures of unknown function reaching into lateral apophyses” were illustrated (Huber 2000: 194, fig. 745). These structures are silk glands and have no relation with the female genitalia (except for filling the available space in the epigynal processes).</p>Published as part of <i>Huber, Bernhard A., 2018, The South American spider genera Mesabolivar and Carapoia (Araneae, Pholcidae): new species and a framework for redrawing generic limits, pp. 1-178 in Zootaxa 4395 (1)</i> on pages 17-18, DOI: 10.11646/zootaxa.4395.1.1, <a href="http://zenodo.org/record/1202519">http://zenodo.org/record/1202519</a>
Huber, Erwin (Birth, 1888-10-18)
No full textAddress: Western Ave5555/Pg 136/1888/M. W./Amer/Amer/Mrs. M. Eichler MfOriginal record filed in drawer labeled 'HUBER-HUHN'
Robust Linear and Support Vector Regression
No full textThe robust Huber M-estimator, a differentiable cost function that is quadratic for small errors and linear otherwise, is
modeled exactly, in the original primal space of the problem, by an easily solvable simple convex quadratic program for both linear and
nonlinear support vector estimators. Previous models were significantly more complex or formulated in the dual space and most
involved specialized numerical algorithms for solving the robust Huber linear estimator [3], [6], [12], [13], [14], [23], [28]. Numerical test
comparisons with these algorithms indicate the computational effectiveness of the new quadratic programming model for both linear
and nonlinear support vector problems. Results are shown on problems with as many as 20,000 data points, with considerably faster
running times on larger problems
Mesabolivar amadoi Huber 2018, sp. n.
No full textMesabolivar amadoi sp. n. Figs 306–314 Diagnosis. Easily distinguished from most known congeners by armature of male chelicerae (Figs 310–311; two pairs of frontal apophyses), tip of procursus (Figs 308–309; distinctive shape of prolateral process), and shape of epigynum (Figs 312–313; anterior plate with large central whitish depression and pair of apophyses); from most similar known species (M. bonita) by apophyses on epigynum (absent in M. bonita) and by positions and sizes of male cheliceral apophyses (proximal apophyses smaller; distal apophyses in more proximal position). Etymology. Named for Jorge Amado (1912–2001), Brazilian writer, author of Gabriela, Cravo e Canela. Type material. BRAZIL: Bahia: ♂ holotype, 1♀ paratype, MNRJ (14319), 14♂ 10♀ paratypes, ZFMK (Ar 19147–48), Reserva Particular do Patrimônio Natural Serra Bonita (15°23.3’–23.4’S, 39°33.7’–34.0’W), ~ 750– 850 m a.s.l., 2–3.x.2011 (B.A. Huber, A. Pérez-González, M. Alves Dias). Other material examined. BRAZIL: Bahia: 1♂ 9♀ in pure ethanol, ZFMK (Br11-161), same data as types. Espírito Santo: 3♂ 16♀ 1 juv., ZFMK (Ar 19149–50), Reserva Biológica de Sooretama, ‘site 1’ (19°03.3’S, 40°08.8’W), ~ 90 m a.s.l., 27.ix.2011 (B.A. Huber, A. Pérez-González); 6♀ in pure ethanol, ZFMK (Br 11-126), same data. Description. Male (holotype) MEASUREMENTS. Total body length 3.3, carapace width 1.3. Distance PME-PME 130 µm, diameter PME 120 µm, distance PME-ALE 100 µm, distance AME-AME 30 µm, diameter AME 50 µm. Sternum width/length: 0.95/ 0.55. Leg 1: 38.7 (11.0 + 0.5 + 10.8 + 14.6 + 1.8), tibia 2: 7.6, tibia 3: 4.9, tibia 4: 7.3; tibia 1 L/d: 94. Femora 1–4 width (at half length): 0.14, 0.15, 0.22, 0.15. COLOR (in ethanol). Prosoma and legs light brown, carapace with large dark median mark, clypeus not darker; tips of femora and tibiae lighter yellowish, legs without dark rings; abdomen greenish gray, dorsally and laterally densely covered with dark marks, ventrally with light brown area in front of gonopore. BODY. Habitus as in putative close relatives (M. bonita, M. pau; cf. Huber 2015: figs 12–13); ocular area raised; carapace with distinct median furrow; clypeus unmodified; sternum unmodified. CHELICERAE. With two pairs of frontal apophyses (Figs 310–311), both pointed in lateral view, distal pair rounded in frontal view. PALPS. As in Figs 306–307; apparently indistinguishable from M. bonita (direct comparison with M. bonita paratype); even details of procursus tip (Figs 308–309) apparently identical. LEGS. Without spines, without curved hairs, few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%; prolateral trichobothrium present on tibia 1; tarsus 1 with>30 pseudosegments, distally fairly distinct. Male (variation). Tibia 1 in 15 other males: 9.4–11.2 (mean 10.2). Female. In general similar to male. Tibia 1 in 25 females: 5.9–8.5 (mean 7.0). Epigynum as in Figs 312–313; anterior plate with large central whitish depression bordered by posterior ridge and pair of apophyses near posterior margin; simple posterior plate. Internal genitalia as in Fig. 314, with pair of large pore-plates in tent-shaped lateral position, converging anteriorly. Natural history. The spiders were found in domed webs built in sheltered spaces close to the ground. Distribution. Known from two localities in Bahia and Espírito Santo states (Brazil) (Fig. 734).Published as part of Huber, Bernhard A., 2018, The South American spider genera Mesabolivar and Carapoia (Araneae, Pholcidae): new species and a framework for redrawing generic limits, pp. 1-178 in Zootaxa 4395 (1) on pages 76-79, DOI: 10.11646/zootaxa.4395.1.1, http://zenodo.org/record/120251
Mesabolivar claricae Huber 2018, sp. n.
No full textMesabolivar claricae sp. n. Figs 233–240, 251–252 Diagnosis. Distinguished from most known congeners by armature of male chelicerae (Figs 238–239; one pair of frontal apophyses near median line), shape of procursus (Figs 233–235; widely curved, distinctive distal structures, without prolateral apophysis), and shape of epigynum (Figs 236–237, 251; trapezoidal anterior plate with pair of apophyses and median pocket); from the very similar to M. cyaneomaculatus by shorter and wider procursus with different distal elements (compare Figs 227–229 and 233–235), and by smaller epigynum without anterior pair of low humps (compare Figs 230–232 and 236–237). Etymology. Named for Clarice Lispector (1920–1977), Brazilian writer, daughter of Russian-Jewish immigrants, author of Perto do coração selvagem. Type material. BRAZIL: Rio de Janeiro: ♂ holotype, 1♀ paratype, MNRJ (14315), 6♂ 19♀ paratypes, ZFMK (Ar 19082–83), Santa Maria Madalena, forest fragment (21°58.9’–59.1’S, 41°57.2’–57.6’W), 480–590 m a.s.l., 30.ix.–1.x.2010 (B.A. Huber, A. Pérez-González). Other material examined. BRAZIL: Rio de Janeiro: 4♀ in pure ethanol, ZFMK (Br 10-78), same data as types. 3♂ 4♀, ZFMK (Ar 19084), Cachoeiras de Macacu, Reserva Ecológica de Guapiaçú (22°24.4’–25.3’S, 42°44.2’–44.3’W), 140–280 m a.s.l., 23.ix.2009 (B.A. Huber, A. Giupponi); 1♂ in pure ethanol, ZFMK (Br 09- 101), same data but 23–24.ix.2009 (B.A. Huber); 2♂, ZFMK (Ar 19085), same data but 25.ix.2009 (B.A. Huber); 2♂ 2♀, ZFMK (Ar 19086), same locality at 22°24.3’S, 42°44.1’W, ~ 300–400 m a.s.l., 24.ix.2009 (B.A. Huber, A. Giupponi). Description. Male (holotype) MEASUREMENTS. Total body length 3.7, carapace width 1.35. Distance PME-PME 110 µm, diameter PME 150 µm, distance PME-ALE 100 µm, distance AME-AME 40 µm, diameter AME 45 µm. Sternum width/length: 1.0/ 0.65. Leg 1: 57.6 (13.7 + 0.5 + 13.5 + 26.8 + 3.1), tibia 2: 8.7, tibia 3: 5.5, tibia 4: 8.3; tibia 1 L/d: 104. Femora 1– 4 width (at half length): 0.17, 0.23, 0.23, 0.17. COLOR (in ethanol). Carapace ochre-orange with large brown median mark including posterior part of ocular area, with pair of light marks laterally behind ocular area; sternum orange-brown; legs brown, tips of femora and tibiae lighter yellowish, without dark rings; abdomen greenish gray, dorsally and laterally densely covered with dark marks, ventrally with orange-brown area in front of gonopore, very indistinct plate in front of spinnerets. BODY. Habitus very similar to M. cyaneomaculatus (cf. Figs 148–149); ocular area raised; carapace with distinct median furrow; clypeus unmodified; sternum unmodified. CHELICERAE. With one pair of frontal apophyses close to median line (Figs 238–239). PALPS. In general very similar to M. cyaneomaculatus (cf. Huber 2000: figs 813, 816), proximal segments apparently identical in shape but slightly smaller (see Variation below); procursus distal part (after bend) clearly shorter and wider, with different distal elements (Figs 233–235); bulbal process in general very similar to M. cyaneomaculatus but clearly shorter (length about 0.4 vs. 0.6). LEGS. Without spines, without curved hairs, few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%; prolateral trichobothrium present on tibia 1; tarsus 1 with>40 pseudosegments, distally fairly distinct. Male (variation). Tibia 1 in nine other males: 12.4–14.1 (mean 13.2). Palpal femur length 0.60–0.62 (vs. 0.67– 0.73 in M. cyaneomaculatus). Female. In general similar to male but all leg femora approximately same width. Tibia 1 in 14 females: 8.7– 10.3 (mean 9.5). Epigynum as in Figs 236–237, 251; anterior plate trapezoidal, with pair of short processes (slightly variable in size even within localities) and median pocket near posterior margin; simple posterior plate. Internal genitalia as in Figs 240, 252, with V-shaped (or U-shaped) sclerite and pair of large pore-plates in tentshaped lateral position, converging anteriorly. Distribution. Known from two localities in Rio de Janeiro state (Brazil) (Fig. 728).Published as part of Huber, Bernhard A., 2018, The South American spider genera Mesabolivar and Carapoia (Araneae, Pholcidae): new species and a framework for redrawing generic limits, pp. 1-178 in Zootaxa 4395 (1) on pages 62-63, DOI: 10.11646/zootaxa.4395.1.1, http://zenodo.org/record/120251
- …
