41 research outputs found
Knüttelversiges Disputatorium. : Eine disharmonische Introduktions-Phantasie.
No full textHandwritten 20-page manuscript by Daniel Lessmann. Also included are a typed transcript and an explanatory letter by
H.G. Reissner.Daniel Lessmann wrote this play for his student Adolf Herz and his siblings Emmy, Toni, Luise, Jette, Emanuel, and
Betty, the children of the banker Leopold Edler von Herz, in whose house in Vienna Lessmann lived from the fall of 1817 to the spring
of 1820. The entire action takes place in Herz’s house, where the children and Lessmann himself appear, as does Ignaz v. Neuwall , who
belongs to one of nine ennobled Jewish families residing in Vienna at that time.Born in Soldin, Neumark (today Myślibórz, Poland) on January 18, 1794, Lessmann was an author who took part in the
German national uprising against Napoleonic rule. He committed suicide in Wittenberg on September 1, 1831.The original German-language inventory is available in the folde
Avoiding Carbon Lock-In: Policy Options for Advancing Structural Change
No full textA major obstacle for the transformation to a low-carbon economy is the risk of a carbon lock-in: fossil fuel-based ('dirty') technologies dominate the market although their carbon-free ('clean') alternatives are dynamically more efficient. We study the interaction of learning-by-doing spillovers and the substitution elasticity between the clean and the dirty sector in an intertemporal general equilibrium model. We find that the substitution possibilities between the two sectors have an ambivalent effect: although a high substitution elasticity requires less aggressive mitigation policies than a low one, it creates a greater lock-in in the absence of regulation. The optimal policy response consists of a permanent carbon tax as well as a learning subsidy for clean technologies. A single policy instrument can also avoid high welfare losses, but a more stringent mitigation target can only be achieved at painful costs. We demonstrate that the policy implication of [Acemoglu et al. 2012] is limited in scope. Our numerical results also highlight that infrastructure provision is crucial to facilitate the low-carbon transformation.structural change, low-carbon economy, carbon lock-in, mitigation policies, learning-by-doing
Putting sustainability into sustainable human development
No full textAbating the threat climate change poses to the lives of future people clearly challenges our development models. The 2011 Human Development Report rightly focuses on the integral links between sustainability and equity. However, the human development and capabilities approach emphasizes the expansion of people's capabilities simpliciter, which is questionable in view of environmental sustainability. We argue that capabilities should be defined as triadic relations between an agent, constraints and possible functionings. This triadic syntax particularly applies to climate change: since people's lives and capabilities are dependent on the environment, sustainable human development should also include constraining human activities in order to prevent losses in future people's well-being due to the adverse effects of exacerbated climate change. On this basis, we will advocate that the goals of sustainable human development should be informed by a framework that consists of enhancing capabilities up to a threshold level, as well as constraining the functionings beyond this threshold in terms of their greenhouse gas emissions. © 2013 Copyright Human Development and Capability Association.SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Applications of Advanced Analytics to the Promotion of Freemium Goods
No full text“Freemium” (Free + Premium) hat sich zu einem führenden Preismodell für digitale Güter entwickelt. Dabei kann die Basisversion eines Produkts, z.B. von Handy-Applikationen (“Apps”), unbegrenzt kostenlos genutzt werden und Firmen bieten Premium-Erweiterungen gegen Bezahlung an. Konsumenten haben in 2018 194 Milliarden mal Apps heruntergeladen und 101 Milliarden US-Dollar für In-App-Einkäufe ausgegeben. Beinahe 80% des Umsatzes auf App-Stores wird dabei durch Handyspiele generiert. 2,4 Milliarden Menschen haben in 2019 Handyspiele gespielt, was der Hälfte aller App-Nutzer im gleichen Zeitraum entspricht.
Die Hauptthese dieser Dissertation ist, dass preisreduzierende Sonderangebote von großer Wichtigkeit für das Vermarkten von Freemium-Gütern sind: Obwohl Freemium bereits eine extreme Preis-Reduktion darstellt, indem es ein Produkt Konsumenten kostenlos zum Ausprobieren zur Verfügung stellt, können demnach Firmen durch die Nutzung weiterer Sonderangebotstaktiken höhere Profite generieren. Die Arbeit postuliert weiter (und beweist dies empirisch), dass lange angenommene Risiken in der Nutzung von Sonderangeboten, die vor allem bei klassischen Konsumgütern etabliert wurden, im Freemium-Bereich in dieser Form nicht zutreffen. Diese Perspektive entwickelt und vertieft der Autor über vier individuelle Papiere, die zusammen mit einer einleitenden Zusammenfassung die fünf Kapitel dieser Dissertation ausmachen.
Die vorliegende Arbeit ist empirischer Natur und wendet “Advanced Analytics”, insbesondere Feldexperimente und maschinelles Lernen, in Zusammenarbeit mit Firmen an. Als repräsentativer Forschungsgrund dienen dabei Freemium-Handyspiele, in denen Firmen detaillierte Daten über Interaktionen mit Kunden sammeln. Anhand dieser Daten leitet der Autor neue Kenntnisse über Kundenverhalten ab und entwickelt Entscheidungsunterstützungssysteme, die es Firmen ermöglichen, höhere Gewinne beim Verkauf von Freemium-Gütern zu erzielen.“Freemium” (free + premium) has become a workhorse pricing model in the digital economy: A basic version of a product or service, e.g., mobile applications (“apps”), can be used for free in perpetuity and premium upgrades are available against payment of a fee. Consumers downloaded apps 194 billion times in 2018 and spent $101 billion on in-app purchases in the same time period. Accounting for almost 80% of that revenue, gaming in particular has seen an unparalleled expansion of demand. It is estimated that 50% of mobile app users play games regularly and that a global total of 2.4 billion people will play mobile games in 2019.
The core thesis of this dissertation is that promotions are essential to the marketing of freemium goods such as mobile apps and games. While freemium already represents a promotional pricing tactic in using a zero price for free sampling, the author conjectures that firms can operate their freemium offerings more profitably by using further promotional tactics, especially targeted and personalized promotions, to sell premium upgrades. The author also argues (and shows) that widespread concerns around the use of promotions, particularly developed in the setting of consumer packaged goods, do not apply in the same way in this setting. This thinking is qualified and developed across four chapters that represent individual papers after providing an introduction to the work in the first chapter.
The work is empirical in nature and applies advanced analytics, in particular field experimentation and machine learning, in collaboration with firms. As representative of the freemium app economy, the collaborating firms observe dense user data that enable the author to both derive insights on consumer behavior that extend existing conceptual thinking in the field of marketing and to devise decision support and expert systems that allow firms to operate more profitably in this setting
Challenge-Aware Traffic Protection in Wireless Mobile Backhaul Networks
No full textTo protect active traffic against link or node failures in multi-hop communications networks, several so-called protection schemes have been introduced in the past. The most established ones are path, segment, node and link protection. However, these schemes are limited as challenges are modelled abstractly whereas challenges in real networks can have very different characteristics. Thus, we propose to explicitly take the high impact challenges by introducing a risk-group concept into the multi-path placement scheme, which provides an evaluation of the likelihood of a challenge to simultaneously affect two network elements. We have implemented and evaluated this new methodology in simulations and show that it outperforms the original scheme.Network Architectures and Services Group (NAS)Electrical Engineering, Mathematics and Computer Scienc
Calculus using proximities: a mathematical approach in which students can actually prove theorems
No full textAbstract
Teaching and learning calculus are notoriously difficult and the didactic solutions may involve resorting to intuitive but vague definitions or informal gestures offered as proofs. The teaching literature is rife with examples of metaphors, adverb manipulations and descriptions of what happens “just before” the limit. It is then difficult to leave the domain of the mental image, thus losing the training in rigour. The author (with Karel Hrbacek and Olivier Lessmann) has endeavoured a radically different approach with the objective of training students to prove theorems while preserving both intuition and mathematical rigour. Hence we change the mathematical setting rather than the didactic setting. The result (which is a by-product of nonstandard analysis) has been used in several high schools in Geneva – Switzerland – for over ten years.</jats:p
Calculus using proximities: a mathematical approach in which students can actually prove theorems
No full textTeaching and learning calculus are notoriously difficult and the didactic solutions may involve resorting to intuitive but vague definitions or informal gestures offered as proofs. The teaching literature is rife with examples of metaphors, adverb manipulations and descriptions of what happens “just before” the limit. It is then difficult to leave the domain of the mental image, thus losing the training in rigour. The author (with Karel Hrbacek and Olivier Lessmann) has endeavoured a radically different approach with the objective of training students to prove theorems while preserving both intuition and mathematical rigour. Hence we change the mathematical setting rather than the didactic setting. The result (which is a by-product of nonstandard analysis) has been used in several high schools in Geneva – Switzerland – for over ten years
Intelligent Agents Living in Social Virtual Environments – Bringing Max into Second Life
No full textWeitnauer E, Thomas N, Rabe F, Kopp S. Intelligent Agents Living in Social Virtual Environments – Bringing Max into Second Life. In: Proc. of Intelligent Virtual Agents (IVA 2008). LNAI, 5208. Berlin/Heidelberg, Germany: Springer; 2008: 552-553
On the Legitimacy of Coercion for the Financing of Public Goods
No full textThe literature on public goods has shown that efficient outcomes are impossible if participation constraints have to be respected. This paper addresses the question whether they should be imposed. It asks under what conditions efficiency considerations justify that individuals are forced to pay for public goods that they do not value. It is shown that participation constraints are desirable if public goods are provided by a malevolent Leviathan. By contrast, with a Pigouvian planner, efficiency can be achieved. Finally, the paper studies the delegation of public goods provision to a profit-maximizing firm. This also makes participation constraints desirable.public goods, mechanism design, incomplete contracts, regulations
