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Relazioni di romanità : una corona bronzea rumena nella Colonna di Traiano
Together with other icons of Romanitas, Trajan's Column represented, and continues to represent, a pivotal symbol of Romanian identity, in some ways the most important. The laying of a bronze wreath at Trajan's Column by the Romanian Delegation at the 12th International Congress of Orientalists, on 12 October 1899, highlights in an exemplary manner the monument's iconic value for modern Romania.
Journal Article
Menschenrechtspolitik in der Zwickmühle
Die Türkei und Russland wurden in den Europarat aufgenommen, um den Aufbau eines liberalen Rechtsstaats zu unterstützen. Dies ist gescheitert. Beide Staaten werden von autoritären Regimen gelenkt, die Demokratie, Rechtsstaatlichkeit und Menschenrechte in Frage stellen. Die Entfremdung zwischen dem Europarat und den beiden Staaten wächst. Seit der Annexion der Krim hat die Parlamentarische Versammlung des Europarats der Delegation aus Russland das Stimmrecht entzogen. Russland hat seine Beitragszahlungen eingestellt, die Türkei zahlt nur noch einen Mindestbeitrag. Manche fordern, die beiden Staaten auszuschließen. Auch in Moskau und Ankara erheben manche Politiker die Forderung, ihre Staaten sollten aus dem Europarat austreten und die Unterschrift unter die Europäische Konvention zum Schutz der Menschenrechte und Grundfreiheiten zurückziehen. Doch Ausschluss oder Austritt gingen vor allem zulasten der Opfer von Menschenrechtsverletzungen in Russland und der Türkei.
When they joined the Council of Europe, neither Turkey nor Russia were constitutional states. They were accepted in order to promote their passage to liberal constitutional statehood. This strategy has failed, however. Russia and Turkey are authoritarian states, the leaders of which call the goals of the Council of Europe – democracy, constitutional statehood and human rights – into question. The distance between the Council of Europe and the two states is growing. Following Russia’s annexation of Crimea, the Parliamentary Assembly of the Council of Europe deprived the Russian delegation of its voting rights. While Turkey has reduced its level of contributions, Russia has ceased to pay them entirely. In Moscow and Ankara, some politicians are demanding a withdrawal from the Council of Europe and the European Convention for the Protection of Human Rights and Fundamental Freedoms. However, the people who would suffer most from a withdrawal or an exclusion would be the victims of human rights abuses in Russia and Turkey.
Journal Article
Dynamic Delegation of Experimentation
I study a dynamic relationship where a principal delegates experimentation to an agent Experimentation is modeled as a one-armed bandit that yields successes following a Poisson process. Its unknown intensity is high or low. The agent has private information, his type being his prior belief that the intensity is high. The agent values successes more than the principal does, so prefers more experimentation. The optimal mechanism is a cutoff rule in the belief space: the cutoff gives pessimistic types total freedom but curtails optimistic types' behavior. Pessimistic types overexperiment while the most optimistic ones underexperiment. This delegation rule is time consistent.
Journal Article
A fully flexible key delegation mechanism with efficient fine-grained access control in CP-ABE
Ciphertext Policy-Attribute Based Encryption (CP-ABE) is a secure one-to-many asymmetric encryption schemes where access control of a shared resource is defined in terms of a set of attributes possessed by a user. Key delegation service, where a user is able to temporally transfer its full or partial access rights, is an important requirement to make CP-ABE based systems practically useful. In existing CP-ABE delegation schemes, a delegator can delegate its entire or partial set of attributes such that all content accessible using those attributes becomes available to the delegatee also. Flexibility to delegate some specific content, which is a practical requirement, is not feasible with these schemes. Further, for a delegated resource, flexibility of fine grained delegation like delegating only a specific subset of read, write and update permissions is not yet available. In this work, CP-ABE key delegation has been enhanced to support specific content and specific permission delegation. The proposed scheme is fully flexible as it additionally supports limits on the number of times delegation can be done, delegatee revocation and traceability of forbidden delegation. Theoretical and practical analysis show that the proposed scheme achieves its objectives and is computationally efficient as well as secure against chosen plaintext and key abuse attacks.
Journal Article
Delegated Expertise, Authority, and Communication
A decision maker needs to reach a decision and relies on an expert to acquire information. Ideal actions of expert and decision maker are partially aligned and the expert chooses what to learn about each. The decision maker can either get advice from the expert or delegate decision making to him. Under delegation, the expert learns his privately optimal action and chooses it. Under communication, advice based on such information is discounted, resulting in losses from strategic communication. We characterize the communication problems that make the expert acquire information of equal use to expert and decision maker. In these problems, communication outperforms delegation.
Journal Article