@misc{IlgenfritzKerlerMuellerPreusskeretal.2003, author = {Ilgenfritz, Ernst-Michael and Kerler, Werner and M{\"u}ller-Preussker, Michael and Sternbeck, Andr{\´e} and St{\"u}ben, Hinnerk}, title = {A numerical reinvestigation of the Aoki phase with \$N_f=2\$ Wilson fermions at zero temperature}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-7492}, number = {03-27}, year = {2003}, abstract = {We report on a numerical reinvestigation of the Aoki phase in lattice QCD with two flavors of Wilson fermions where the parity-flavor symmetry is spontaneously broken. For this purpose the Hybrid Monte Carlo algorithm was used and an explicit symmetry-breaking source term \$h\bar{\psi} i \gamma_{5} \tau^{3}\psi\$ was added to the Wilson fermion action. The order parameter \$\langle\bar{\psi}i\gamma_{5}\tau^{3}\psi\rangle\$ was studied at several values of \$(\beta,\kappa,h)\$ on lattices of sizes \$4^4\$ to \$12^4\$. Our largest lattices can be considered as infintely large allowing to extrapolate to \$h=0\$. The existence of a parity-flavor-breaking phase can be confirmed at \$\beta=4.0\$ and \$\beta=4.3\$ while we find no sign of parity-flavor-breaking at \$\beta=4.6\$ and \$\beta=5.0\$.}, language = {en} } @misc{BaumannHegeSchwarzetal.1996, author = {Baumann, Wolfgang and Hege, Hans-Christian and Schwarz, Uwe and St{\"u}ben, Hinnerk}, title = {Netzverteilte Visualisierung und Simulation}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-5379}, number = {TR-96-08}, year = {1996}, abstract = {Dieser Bericht beschreibt die Ergebnisse eines Anwendungsprojektes, das parallel zum Aufbau des Berliner Hochgeschwindigkeitsdatennetzes (Berlin Regional Testbed) am ZIB durchgef{\"u}hrt wurde. Es werden allgemeine Werkzeuge und anwendungsspezifische Arbeitsumgebungen zur netzverteilten Visualisierung und Simulation vorgestellt. Die allgemeinen Werkzeuge unterst{\"u}tzen folgende Aufgaben: Kopplung von Simulationen auf (Hochleistungs-)Rechnern an lokale Grafikarbeitspl{\"a}tze, objektorientierte und verteilte Visualisierung, Remote-Videoaufzeichnung, Bilddatenkompression und digitaler Filmschnitt. Die spezifischen Arbeitsumgebungen wurden f{\"u}r Aufgaben aus den Bereichen Numerische Mathematik, Astrophysik, Strukturforschung, Chemie, Polymerphysik und Str{\"o}mungsmechanik entwickelt.}, language = {de} } @misc{BaumannBuschGottschewskietal.1997, author = {Baumann, Wolfgang and Busch, Hubert and Gottschewski, J{\"u}rgen and Steinke, Thomas and St{\"u}ben, Hinnerk}, title = {Berliner Landesh{\"o}chstleistungsrechner Parallelrechner Cray T3D/T3E: Betrieb, Nutzung, Projekte, Perspektiven f{\"u}r den Ausbau}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-5504}, number = {TR-97-08}, year = {1997}, abstract = {Seit fast drei Jahren betreibt das Konrad-Zuse-Zentrum f{\"u}r Informationstechnik Berlin (ZIB) Parallelrechner der h{\"o}chsten Leistungsklasse im normalen Rechenzentrumsbetrieb. Bereits im Mai 1995 hat das ZIB {\"u}ber seine Erfahrungen mit dem damals leistungsst{\"a}rksten Parallelrechner Deutschlands berichtet. Das Gesamtkonzept des ZIB sieht weiterhin einen H{\"o}chstleistungsrechner als unabdingbaren Bestandteil des High Performance Scientific Computing (HPSC) im ZIB vor. Der vorliegende Bericht beschreibt die aktuelle Konfiguration, Betriebserfahrungen und die Rechnernutzung sowie typische Rechenleistungen, die f{\"u}r einzelne Anwendungsprogramme erzielt wurden. Beschreibungen der Forschungsgebiete mit den Forschungsgruppen, die den Rechner nutzen und die Anforderungen an den Rechnerausbau, die sich aus deren Arbeiten herleiten, beschließen den Bericht.}, language = {de} } @misc{IlgenfritzKerlerStueben1999, author = {Ilgenfritz, Ernst-Michael and Kerler, Werner and St{\"u}ben, Hinnerk}, title = {Decorrelation of the topological charge in tempered Hybrid Monte Carlo simulations of QCD}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-4168}, number = {SC-99-28}, year = {1999}, abstract = {We study the improvement of simulations of QCD with dynamical Wilson fermions by combining the Hybrid Monte Carlo algorithm with parallel tempering. As an indicator for decorrelation we use the topological charge.}, language = {en} } @misc{Stueben1999, author = {St{\"u}ben, Hinnerk}, title = {Decorrelation of the Topological Charge in Tempered Simulations of Full QCD}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-4369}, number = {SC-99-47}, year = {1999}, abstract = {The improvement of simulations of QCD with dynamical Wilson fermions by combining the Hybrid Monte Carlo algorithm with parallel tempering is studied. As an indicator for decorrelation the topological charge is used.}, language = {en} } @article{ReinefeldStuebenSchintkeetal.2002, author = {Reinefeld, Alexander and St{\"u}ben, Hinnerk and Schintke, Florian and Din, George}, title = {GuiGen: a toolset for creating customized interfaces for Grid user communities}, volume = {18}, journal = {Future Generation Comp. Syst.}, number = {8}, doi = {10.1016/S0167-739X(02)00086-9}, pages = {1075 -- 1084}, year = {2002}, language = {en} } @misc{DeuflhardKleinReinefeldetal.1999, author = {Deuflhard, Peter and Klein, Rupert and Reinefeld, Alexander and St{\"u}ben, Hinnerk}, title = {Power-User und Supercomputer}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-4070}, number = {SC-99-19}, year = {1999}, abstract = {Abstract-Sammlung zum gleichnamigen Workshop am ZIB vom 19.--20. Mai 1999}, language = {de} } @misc{IlgenfritzKerlerMuellerPreusskeretal.2000, author = {Ilgenfritz, Ernst-Michael and Kerler, Werner and M{\"u}ller-Preussker, Michael and St{\"u}ben, Hinnerk}, title = {Parallel tempering and decorrelation of topological charge in full QCD}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-5930}, number = {00-25}, year = {2000}, abstract = {The improvement of simulations of QCD with dynamical Wilson fermions by combining the Hybrid Monte Carlo algorithm with parallel tempering is studied on \$10^4\$ and \$12^4\$ lattices. As an indicator for decorrelation the topological charge is used.}, language = {en} } @misc{Stueben2000, author = {St{\"u}ben, Hinnerk}, title = {Hadron masses from dynamical, non-perturbatively O(a) improved Wilson fermions}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-6205}, number = {00-52}, year = {2000}, abstract = {We present results on light hadron masses from simulations of full QCD and report on experiences in running such simulations on a Hitachi SR8000-F1 supercomputer.}, language = {en} } @misc{IlgenfritzKerlerMuellerPreusskeretal.2001, author = {Ilgenfritz, Ernst-Michael and Kerler, Werner and M{\"u}ller-Preussker, Michael and St{\"u}ben, Hinnerk}, title = {Parallel tempering in full QCD with Wilson fermions}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-6593}, number = {01-33}, year = {2001}, abstract = {We study the performance of QCD simulations with dynamical Wilson fermions by combining the Hybrid Monte Carlo algorithm with parallel tempering on \$10^4\$ and \$12^4\$ lattices. In order to compare tempered with standard simulations, covariance matrices between sub-ensembles have to be formulated and evaluated using the general properties of autocorrelations of the parallel tempering algorithm. We find that rendering the hopping parameter \$\kappa\$ dynamical does not lead to an essential improvement. We point out possible reasons for this observation and discuss more suitable ways of applying parallel tempering to QCD.}, language = {en} } @misc{ReinefeldStuebenSchintkeetal.2002, author = {Reinefeld, Alexander and St{\"u}ben, Hinnerk and Schintke, Florian and Din, George}, title = {GuiGen: A Toolset for Creating Customized Interfaces for Grid User Communities}, url = {http://nbn-resolving.de/urn:nbn:de:0297-zib-6737}, number = {02-06}, year = {2002}, abstract = {\textsf{\itshape{GuiGen}} is a comprehensive set of tools for creating customized graphical user interfaces (GUIs). It draws from the concept of computing portals, which are here seen as interfaces to application-specific computing services for user communities. While \textsf{\itshape{GuiGen}} was originally designed for the use in computational grids, it can be used in client/server environments as well. Compared to other GUI generators, \textsf{\itshape{GuiGen}} is more versatile and more portable. It can be employed in many different application domains and on different target platforms. With \textsf{\itshape{GuiGen}}, application experts (rather than computer scientists) are able to create their own individually tailored GUIs.}, language = {en} }