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151. MATINEE: A Quality-of-Service-aware Event Semantics Modeling Language

Author

Wahl, Andreas M., Fischer, Thomas, and Lenz, Richard

Subjects
Domänenspezifische Programmiersprache, ddc:000, Department Informatik, Publish-Subscribe-System
Abstract

Distributed event-based systems have risen in significance over the last few years across many different application domains. Still, the configuration of available communication middleware solutions remains an elaborate task driven by technical terms and manual performance optimization. We present the M2etis Quality-of-service-aware Semantics Modeling Language (MATINEE), a domain-specific language for modeling the QoS requirements and semantic properties of event-based systems in the terminology of the application domain. No knowledge of the technical terms of the underlying middleware solution is required by the application developers to conduct the configuration. Embedded in a novel configuration methodology provided by the M2etis project, MATINEE specifications are interpreted to automatically derive optimal middleware configurations without the need for manual optimization. The purpose of MATINEE is to provide a flexible language that can easily be adapted to different application domains. We focus on the language specification of MATINEE, briefly sketch our configuration methodology and present related language approaches.

Published
2014

154. Umsatzsteuerrecht visualisiert

Author

Bader, Julia, primary, Meissner, Gabi, additional, Wahl, Andreas, additional, Bobikov, Marina, additional, Lamari, Athanasia, additional, and Ravensberg, Stefanie, additional

Published
2017
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157. A propensity score-matched comparison between Cardia and Amplatzer PFO closure devices - insights from the SOLUTION registry (Swiss percutaneOus patent foramen ovale cLosUre in recurrent clinical events prevenTION)

Author

Puricel, Serban, primary, Arroyo, Diego, additional, Goy, Jean-Jacques, additional, Praz, Fabien, additional, Palhais, Nuno, additional, Wahl, Andreas, additional, Stauffer, Jean-Christophe, additional, Togni, Mario, additional, Berger, Alexandre, additional, Meier, Bernhard, additional, and Cook, Stéphane, additional

Published
2015
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159. ' Kan du velge fysikk uten å vite hva det er?': en undersøkelse av fysikkens posisjon i naturfaget

Author

Wahl, Andreas and Norges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for fysikk

Abstract

Denne masteroppgaven tar for seg naturfaget på ungdomstrinnet og første klasse på videregående skole, med spesielt fokus på fysikkfagets stilling innen dette faget. Oppgaven tar for seg naturfaget på tre nivåer; Formål, hovedområder og kompetansemål i læreplanen analyseres med bakgrunn i et kategoriskjema med de fem fagdisiplinene biologi, fysikk, geologi, kjemi og teknologi. Det samme kategoriskjemaet danner grunnlaget for en kvantitativ innholdsanalyse av de to mest brukte læreverkene i naturfag. Til sist er elever på 8. trinn og Vg1 spurt en rekke spørsmål rundt sine holdninger til og kunnskaper om fagdisiplinene nevnt ovenfor. Disse dataene er så analysert statistisk. Læreplanen legger ingen føringer for tids- eller ressursbruk mellom emnene. Men dersom vi tillegger alle hovedområder og kompetansemål lik vekt, vil resultatet av læreplananalysen i denne oppgaven tyde på at biologi og fysikk får størst plass, etterfulgt av kjemi og teknologi. Tendensen er den samme for lærebøkene i fordeling av sider mellom fagdisiplinene, men med teknologi og geofag som de store taperne. En opptelling av ord som inneholder fagnavnene gir dog helt motsatte resultater. Kjemi- og teknologiord brukes i langt større utstrekning enn fysikkord. Elevene ser på fysikk som en del av naturfaget det er viktig å lære om, men faget kommer likevel litt i skyggen av kjemi og biologi. Mange av elevene svarer at de vet hva fysikk er, men når de bes om å kategorisere typiske fysikkemner er det likevel mange som har problemer. Med bakgrunn i resultatene anbefales dagens naturfagslærere å være ekstra oppmerksomme på å gi elevene innsikt i hvilke emner som inngår i fagdisiplinene de senere skal velge. Fremtidige lærebokforfattere anbefales å styrke koblingen mellom fysikkfaglig stoff og fagnavnet fysikk, og i større grad benytte fagspesifikke titler istedenfor det nøytrale forsker. Dette for å gi elevene innsikt i fagdisiplinene de kan velge på videregående. Først da danner naturfaget et grunnlag for videre studievalg, slik læreplanen sier.

Published
2009

165. Exaptation as Innovation Strategy? Evidence from the Medical Device Industry.

Author

Giones, Ferran, Wahl, Andreas, and Schweisfurth, Tim

Abstract

Exaptation constitutes an alternative mechanism to adaptation in a firm's diversification efforts. The intentional repurposing of existing solutions or technologies for new functions in new domains constitutes a little-understood effort in the innovation strategy of firms. We build upon Andriani et al. (2017) pioneering work on the pharmaceutical industry to uncover the exaptation dynamics in the medical device industry, known for its rapid growth and innovativeness. We study over 45,000 product registrations in the last two decades to 1) validate the existence of exaptation behavior, 2) identify the firm-level characteristics, and 3) understand the main antecedents and their effect on exaptation as a diversification innovation strategy. We contribute to the emerging literature on exaptation by suggesting how it is part of the innovation strategy of firms that use it to reinforce their position in known application domains (inwards) instead of supporting efforts to diversify building new functions for new markets. [ABSTRACT FROM AUTHOR]

Published
2023
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166. Measuring Entrepreneurial Ecosystems: A District Approach.

Author

Hess, Sophia, Wahl, Andreas, and Johnson, Alan

Abstract

Entrepreneurial Ecosystems (EEs) offer researchers and policymakers an important lens to understand new venture creation and growth. However, existing measures condition EE research because of 1) the absence of systematic scale development procedures and latent factor structure evaluation, and 2) limited data sources beyond the macro- or region-level. We focus on scale development and confirmatory factor analyses to select and evaluate measures that can zoom in and amplify our understanding of EE elements by combining survey data from founders at the firm-level with archival data sources at the city and rural district-level. The paper draws on a pilot study of 257 high-technology startups from Baden-Württemberg, Germany. Findings suggest that: 1) some measures can be trimmed where a subset of the items capture the focal construct well, and 2) other measures need to be improved where items do not load together as expected. The paper builds on previous research to find that 1) a first-order measurement model including ten EE elements has 'acceptable' model fit and 2) the measurement model at the district-level offers insights not observed on the region- or state-level. To advance the EE research program, validated measures are needed to refine predictions, test hypotheses, and monitor policy interventions. [ABSTRACT FROM AUTHOR]

Published
2023
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167. IT-baserad hemvård av djur med hjärtfel

Author

Wahl, Andreas and Wahl, Andreas

Abstract

Studiens målsättning var att utvärdera om ett internetbaserat system kan användas för att förbättra vården av hjärtsjuka hundar och katter. Detta med huvudsyfte att på ett tidigare stadium kunna upptäcka en hälsoförsämring samt visa om eftersträvad effekt uppnås vid behandling och medicinering av hjärtsvikt. Hjärtsjuka hundar och katter är vanligt förekommande patienter bland våra smådjur och hanteringen av dessa är en utmaning för veterinärer. Denna patientgrupp är ofta hemma långa perioder mellan återbesöken och akuta veterinärbesök på grund av uppkomst av hjärtsvikt är vanligt förekommande. Systemet som användes i studien fick namnet PetHeart och bygger på att djurägare i hemmamiljö, mäter och via en webbportal rapporterar in parametrar som kan förändras i samband med progrediering av hjärtsjukdom. Dessutom har djurägarna via webbportalen besvarat hälsorelaterade frågor om sitt djur och en dialogfunktion har möjliggjort kommunikation med vårdgivaren. Inrapporterad data avlästes dagligen av vårdgivaren och vid misstanke om en försämring utifrån inrapporterad data kontaktades djurägaren. Till skillnad mot på veterinärsidan där mycket lite inom området verkar vara gjort har flera studier på humansidan demonstrerat genomförbarheten och fördelarna med användandet av eHälso-lösningar som en del i uppföljningen av kroniskt hjärtsjuka patienter. Patienter som hemifrån regelbundet rapporterar in objektiva parametrar såväl som subjektiva hälsosymptom, vilka sedan granskas av vårdpersonal, har visats ha ett lägre antal sjukhusinskrivningar, sjukhusbesök och en högre livskvalitet jämfört med kontrollpatienter. Vi har under studieperioden följt totalt 26 hundar och katter, varav 17 hjärtsjuka djur och 9 friska kontroller. Vid sju olika tillfällen har vi utifrån inrapporterad data kunnat misstänka en försämring av hälsotillståndet, vilket föranlett till kontakt med djurägaren. Djurägarna var positiva till systemet i den enkät som skickades ut och flera djurägare uppgav att det, The purpose of this study was to evaluate whether an internet-based system can be used to improve the care of dogs and cats with heart disease. The aim is to detect health impairment at an earlier stage, and demonstrate whether the desired effect is achieved in the treatment and medication of heart failure. Dogs and cats suffering from heart disease are common patients among small animals and their management is a challenge for veterinarians. This group of patients often stays at home for long periods between re-visits, and emergency visits due to the onset of heart failure are common. The system used in this study is named PetHeart. It is based on the pet owners themselves, who measure and report parameters that change in the progression of heart disease, via a web portal. In addition, pet owners answer health-related questions about their animals via the web portal, and have the possibility of communicating with the veterinarian via a dialogue function. Reported data was read daily by the caregiver, who could contact the pet owner if the reported data led to a suspicion of a deterioration in the health of the patient. This is a new concept for veterinarians, as little research has been done in this area. In contrast research in human medical care demonstrates the feasibility and benefits of the use of eHealth solutions as part of the monitoring of chronically ill heart patients. In these studies, human patients report objective parameters as well as subjective health symptoms from home on a regular basis which is then examined by the medical staff. This system has been shown to have a lower number of hospitalizations, hospital visits and a higher quality of life compared with control patients. In this study we have followed a total of 26 dogs and cats, including 17 animals with heart disease and 9 healthy controls. On seven different occasions, we have suspected a deterioration of health based on data reported, which led to contact with the animal owner. Pet owner

Published
2013

168. Reversing (Inter)national policy : Germanyïs response to transboundary air pollution

Author

Sprinz, Detlef F. and Wahl, Andreas

Subjects
Sozialwissenschaften
Abstract

Perhaps like no other country, Germany has radically changed its policies towards regulating air pollution in the European context. Acting originally as a dragger in the 1970s to regulate transboundary air pollutants due to pessimism about the relationship between causes and effects, Germany responded very decisively to its own damage assessment in the early 1980s. In particular the adverse effects to forests (Waldsterben" or forest decline) led to the formulation of strict air pollution regulations in the domestic context, efforts to spread the regulatory system within the European Union, and activities within the United Nations Economic Commission for Europe to foster stronger, continent-wide emission reductions. Using three conceptual models (rational actor, domestic politics, and social learning), we show that Germany deviated strongly from the ideal policy cycle consisting of (i) domestic policy formulation, (ii) international negotiations, as well as (iii) implementation and compliance with the provisions of international environmental agreements. Both national policy-making as well as partial implementation have been well on the way towards compliance even before Germany entered international negotiations on substantive protocols. Therefore, one may conclude from this country study that push countries may use the results of their national policy processes to influence the policy of other countries.

Published
2000

169. Intracoronary Injection of Bone Marrow–Derived Mononuclear Cells Early or Late After Acute Myocardial Infarction

Author

Sürder, Daniel, primary, Manka, Robert, additional, Lo Cicero, Viviana, additional, Moccetti, Tiziano, additional, Rufibach, Kaspar, additional, Soncin, Sabrina, additional, Turchetto, Lucia, additional, Radrizzani, Marina, additional, Astori, Giuseppe, additional, Schwitter, Juerg, additional, Erne, Paul, additional, Zuber, Michel, additional, Auf der Maur, Christoph, additional, Jamshidi, Peiman, additional, Gaemperli, Oliver, additional, Windecker, Stephan, additional, Moschovitis, Aris, additional, Wahl, Andreas, additional, Bühler, Ines, additional, Wyss, Christophe, additional, Kozerke, Sebastian, additional, Landmesser, Ulf, additional, Lüscher, Thomas F., additional, and Corti, Roberto, additional

Published
2013
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170. Recent Developments of Pump Stations for Longwall Hydraulics.

Author

Wahl, Andreas and Sprakel, Jan

Subjects
HYDRAULICS, PUMPING stations, VARIABLE speed drives
Abstract

Copyright of Mining Report is the property of GVSt,GesamtverbandSteinkohlee.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2016

171. An Architecture for Continuous Data Quality Monitoring in Medical Centers.

Author

Endler, Gregor, Schwab, Peter K., Wahl, Andreas M., Tenschert, Johannes, and Lenz, Richard

Subjects
DATA corruption, MEDICAL centers, HEALTH facilities, MEDICAL care, DATA analysis
Abstract

In the medical domain, data quality is very important. Since requirements and data change frequently, continuous and sustainable monitoring and improvement of data quality is necessary. Working together with managers of medical centers, we developed an architecture for a data quality monitoring system. The architecture enables domain experts to adapt the system during runtime to match their specifications using a built-in rule system. It also allows arbitrarily complex analyses to be integrated into the monitoring cycle. We evaluate our architecture by matching its components to the well-known data quality methodology TDQM. [ABSTRACT FROM AUTHOR]

Published
2015
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174. Long-Term Propensity Score–Matched Comparison of Percutaneous Closure of Patent Foramen Ovale With Medical Treatment After Paradoxical Embolism

Author

Wahl, Andreas, primary, Jüni, Peter, additional, Mono, Marie-Luise, additional, Kalesan, Bindu, additional, Praz, Fabien, additional, Geister, Laura, additional, Räber, Lorenz, additional, Nedeltchev, Krassen, additional, Mattle, Heinrich P., additional, Windecker, Stephan, additional, and Meier, Bernhard, additional

Published
2012
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177. Randomized clinical trial comparing percutaneous closure of patent foramen ovale (PFO) using the Amplatzer PFO Occluder with medical treatment in patients with cryptogenic embolism (PC-Trial): rationale and design

Author

Khattab, Ahmed A, primary, Windecker, Stephan, additional, Jüni, Peter, additional, Hildick-Smith, David, additional, Dudek, Dariusz, additional, Andersen, Henning R, additional, Ibrahim, Reda, additional, Schuler, Gerhard, additional, Walton, Antony S, additional, Wahl, Andreas, additional, Mattle, Heinrich P, additional, and Meier, Bernhard, additional

Published
2011
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181. Coronary collateral flow in response to endurance exercise training

Author

Zbinden, Rainer, primary, Zbinden, Stephan, additional, Meier, Pascal, additional, Hutter, Damian, additional, Billinger, Michael, additional, Wahl, Andreas, additional, Schmid, Jean-Paul, additional, Windecker, Stephan, additional, Meier, Bernhard, additional, and Seiler, Christian, additional

Published
2007
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182. Transcatheter treatment of atrial septal aneurysm associated with patent foramen ovale for prevention of recurrent paradoxical embolism in high-risk patients

Author

Wahl, Andreas, primary, Meier, Bernhard, additional, Schwerzmann, Markus, additional, Becker, Ulf, additional, Seiler, Christian, additional, Arnold, Marcel, additional, Mattle, Heinrich P., additional, Krumsdorf, Ulrike, additional, Sievert, Horst, additional, Ostermayer, Stephan, additional, Billinger, Kai, additional, and Windecker, Stephan, additional

Published
2005
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183. Clinical relevance of imaging proliferative activity in lung nodules

Author

Buck, Andreas K., primary, Hetzel, Martin, additional, Schirrmeister, Holger, additional, Halter, Gisela, additional, Möller, Peter, additional, Kratochwil, Clemens, additional, Wahl, Andreas, additional, Glatting, Gerhard, additional, Mottaghy, Felix M., additional, Mattfeldt, Torsten, additional, Neumaier, Bernd, additional, and Reske, Sven N., additional

Published
2004
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193. Percutaneous Closure of Patent Foramen Ovale with the Amplatzer PFO Occluder.

Author

Cannon, Christopher P., Herrmann, Howard C., Wahl, Andreas, Windecker, Stephan, and Meier, Bernhard

Abstract

The foramen ovale, which remains probe-patent throughout adulthood in approximately one-fourth of the general population (1), has increasingly been recognized as potential mediator of several disease manifestations, including paradoxical embolism, refractory hypoxemia as a result of right-to-left shunt in patients with right ventricular infarction or severe pulmonary disease, orthostatic desaturation in the setting of the rare platypnea-orthodeoxia syndrome, neurological decompression illness in divers, and, more recently, migraine with aura. Percutaneous closure of the patent foramen ovale (PFO) has been shown safe and feasible using a variety of transseptal occlusion devices in previous reports (2- 10). Initial device-related complications inflicted by large delivery systems, device dislodgment and embolization, structural failure, thrombus formation, and inability to reposition or remove the device have been reduced by recent improvements in device design. In particular, the appreciation of anatomic and physiologic differences between PFOs and atrial-septal defects (ASDs), led to the development of devices specifically designed for percutaneous PFO closure. The Amplatzer PFO Occluder® (AGA Medical, Golden Valley, MN, USA) is a self-expanding device manufactured from nitinol wire with polyester fabric, which is fully removable and repositionable as long as it remains screwed to the delivery cable (11,12). In particular, the differences in design in contrast to the Amplatzer ASD Occluder are a smaller left than right atrial disk (except for the smallest model) and a slightly elongated, thin, and flexible waist connecting the two retention disks. In this chapter, the anatomy of the PFO, the currently available diagnostic techniques, the rationale for PFO closure, and the technique and the results of PFO closure using the Amplatzer PFO Occluder will be reviewed. [ABSTRACT FROM AUTHOR]

Published
2005
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199. Late Results After Percutaneous Closure of Patent Foramen Ovale for Secondary Prevention of Paradoxical Embolism Using the Amplatzer PFO Occluder Without Intraprocedural Echocardiography: Effect of Device Size.

Author

Wahl, Andreas, Tai, Tony, Praz, Fabien, Schwerzmann, Markus, Seiler, Christian, Nedeltchev, Krassen, Windecker, Stephan, Mattle, Heinrich P., and Meier, Bernhard

Subjects
ECHOCARDIOGRAPHY, ARTERIOVENOUS fistula, ARTERIAL occlusions, EMBOLISMS
Abstract

Objectives: We sought to assess the safety and clinical efficacy of patent foramen ovale (PFO) closure under fluoroscopic guidance only, without intraprocedural echocardiography. Background: Percutaneous PFO closure has been shown to be safe and feasible using several devices. It is generally performed using simultaneously fluoroscopic and transesophageal or intracardiac echocardiographic guidance. Transesophageal echocardiography requires sedation or general anesthesia and intubation to avoid aspiration. Intracardiac echocardiography is costly and has inherent risks. Both lengthen the procedure. The Amplatzer PFO Occluder (AGA Medical Corporation, Golden Valley, Minnesota) can be safely implanted without echocardiographic guidance. Methods: A total of 620 patients (51 ± 12 years; 66% male) underwent PFO closure using the Amplatzer PFO Occluder for secondary prevention of presumed paradoxical embolism. Based on size and mobility of the PFO and the interatrial septum, an 18-mm device was used in 50 patients, a 25-mm device in 492, and a 35-mm device in 78. Results: All procedures were successful, with 5 procedural complications (0.8%): 4 arteriovenous fistulae requiring elective surgical correction, and 1 transient ischemic attack. Contrast transesophageal echocardiography at 6 months showed complete closure in 91% of patients, whereas a minimal, moderate, or large residual shunt persisted in 6%, 2%, and 1%, respectively. During a mean follow-up period of 3.0 ± 1.9 years (median: 2.6 years; total patient-years: 1,871), 5 ischemic strokes, 8 transient ischemic attacks, and no peripheral emboli were reported. Freedom from recurrent ischemic stroke, transient ischemic attack, or peripheral embolism was 99% at 1 year, 99% at 2 years, and 97% at 5 years. Conclusions: The Amplatzer PFO Occluder affords excellent safety and long-term clinical efficacy of percutaneous PFO closure without intraprocedural echocardiography. [Copyright &y& Elsevier]

Published
2009
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200. Heat transfer correlation for sCO2 cooling in a 2 mm tube.

Author

Wahl, Andreas, Mertz, Rainer, Laurien, Eckart, and Starflinger, Jörg

Subjects
*HEAT transfer, *HEAT transfer coefficient, *HEAT flux, *HEAT transfer fluids, *COOLING, *PROPERTIES of fluids, *STEAM generators
Abstract

• Heat transfer of sCO 2 depends strongly on the fluid temperature and pressure. • Cooling water temperature leads to a trade-off in heat transfer performance. • CO 2 mass flux influences the heat transfer much stronger near the pseudocritical temperature. • The wall fluid properties are most appropriate for sCO 2 cooling Nusselt correlation. [Display omitted] The heat transfer of carbon dioxide near the critical point cooled in a horizontal tube with 2 mm inner diameter was investigated experimentally. The local heat transfer coefficients (htc) were determined by temperature measurements inside the tube wall along the 1.2 m cooled length. The effects of the CO 2 mass fluxes in the range of 400–1300 kg/m2s, CO 2 inlet pressures between 77 and 85 bar, CO 2 bulk fluid temperatures between 10 and 85 °C and cooling water temperatures between 10 and 40 °C on the heat transfer were examined. The experimental results are compared with existing correlations for sCO 2 heat transfer in small diameter tubes. A modified Dittus-Boelter equation was developed to predict the heat transfer coefficients with an accuracy of 20%. [ABSTRACT FROM AUTHOR]

Published
2021
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