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Institute
- WeltTrends e.V. Potsdam (43)
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Because software development is increasingly expensive and timeconsuming, software reuse gains importance. Aspect-oriented software development modularizes crosscutting concerns which enables their systematic reuse. Literature provides a number of AOP patterns and best practices for developing reusable aspects based on compelling examples for concerns like tracing, transactions and persistence. However, such best practices are lacking for systematically reusing invasive aspects. In this paper, we present the ‘callback mismatch problem’. This problem arises in the context of abstraction mismatch, in which the aspect is required to issue a callback to the base application. As a consequence, the composition of invasive aspects is cumbersome to implement, difficult to maintain and impossible to reuse. We motivate this problem in a real-world example, show that it persists in the current state-of-the-art, and outline the need for advanced aspectual composition mechanisms to deal with this.
The correctness of model transformations is a crucial element for the model-driven engineering of high quality software. A prerequisite to verify model transformations at the level of the model transformation specification is that an unambiguous formal semantics exists and that the employed implementation of the model transformation language adheres to this semantics. However, for existing relational model transformation approaches it is usually not really clear under which constraints particular implementations are really conform to the formal semantics. In this paper, we will bridge this gap for the formal semantics of triple graph grammars (TGG) and an existing efficient implementation. Whereas the formal semantics assumes backtracking and ignores non-determinism, practical implementations do not support backtracking, require rule sets that ensure determinism, and include further optimizations. Therefore, we capture how the considered TGG implementation realizes the transformation by means of operational rules, define required criteria and show conformance to the formal semantics if these criteria are fulfilled. We further outline how static analysis can be employed to guarantee these criteria.
Tolerierter Schmuggel
(2010)
Grenzen sind soziale Tatsachen, die sich räumlich manifestieren – etwa wenn Schmuggler und Grenzschützer an Grenzübergängen aufeinandertreffen und in ritualisierter Form Bedingungen und Möglichkeiten des Grenzübertritts aushandeln. Das Grenzgeschehen wird in diesem Beitrag in soziologisch-ethnologischer Perspektive am Beispiel des Kaliningrader Grenzgebiets betrachtet.
This paper studies the persistence of daily returns of 21 German stocks from 1960 to 2008. We apply a widely used test based upon the modified R/S-Method by Lo [1991]. As an extension to Lux [1996] and Carbone et al. [2004] and in analogy to moving average or moving volatility, the statistics is calculated for moving windows of length 4, 8, and 16 years for every time series. Periods of persistence or long memory in returns can be found in some but not all time series. Robustness of results is verified by investigating stationarity and short memory effects.
Think local sell global
(2010)
With the rise of nanotechnology in the last decade, nanofluidics has been established as a research field and gained increased interest in science and industry. Natural aqueous nanofluidic systems are very complex, there is often a predominance of liquid interfaces or the fluid contains charged or differently shaped colloids. The effects, promoted by these additives, are far from being completely understood and interesting questions arise with regards to the confinement of such complex fluidic systems. A systematic study of nanofluidic processes requires designing suitable experimental model nano – channels with required characteristics. The present work employed thin liquid films (TLFs) as experimental models. They have proven to be useful experimental tools because of their simple geometry, reproducible preparation, and controllable liquid interfaces. The thickness of the channels can be adjusted easily by the concentration of electrolyte in the film forming solution. This way, channel dimensions from 5 – 100 nm are possible, a high flexibility for an experimental system. TLFs have liquid IFs of different charge and properties and they offer the possibility to confine differently shaped ions and molecules to very small spaces, or to subject them to controlled forces. This makes the foam films a unique “device” available to obtain information about fluidic systems in nanometer dimensions. The main goal of this thesis was to study nanofluidic processes using TLFs as models, or tools, and to subtract information about natural systems plus deepen the understanding on physical chemical conditions. The presented work showed that foam films can be used as experimental models to understand the behavior of liquids in nano – sized confinement. In the first part of the thesis, we studied the process of thinning of thin liquid films stabilized with the non – ionic surfactant n – dodecyl – β – maltoside (β – C₁₂G₂) with primary interest in interfacial diffusion processes during the thinning process dependent on surfactant concentration 64. The surfactant concentration in the film forming solutions was varied at constant electrolyte (NaCl) concentration. The velocity of thinning was analyzed combining previously developed theoretical approaches. Qualitative information about the mobility of the surfactant molecules at the film surfaces was obtained. We found that above a certain limiting surfactant concentration the film surfaces were completely immobile and they behaved as non – deformable, which decelerated the thinning process. This follows the predictions for Reynolds flow of liquid between two non – deformable disks. In the second part of the thesis, we designed a TLF nanofluidic system containing rod – like multivalent ions and compared this system to films containing monovalent ions. We presented first results which recognized for the first time the existence of an additional attractive force in the foam films based on the electrostatic interaction between rod – like ions and oppositely charged surfaces. We may speculate that this is an ion bridging component of the disjoining pressure. The results show that for films prepared in presence of spermidine the transformation of the thicker CF to the thinnest NBF is more probable as films prepared with NaCl at similar conditions of electrostatic interaction. This effect is not a result of specific adsorption of any of the ions at the fluid surfaces and it does not lead to any changes in the equilibrium properties of the CF and NBF. Our hypothesis was proven using the trivalent ion Y3+ which does not show ion bridging. The experimental results are compared to theoretical predictions and a quantitative agreement on the system’s energy gain for the change from CF to NBF could be obtained. In the third part of the work, the behavior of nanoparticles in confinement was investigated with respect to their impact on the fluid flow velocity. The particles altered the flow velocity by an unexpected high amount, so that the resulting changes in the dynamic viscosity could not be explained by a realistic change of the fluid viscosity. Only aggregation, flocculation and plug formation can explain the experimental results. The particle systems in the presented thesis had a great impact on the film interfaces due to the stabilizer molecules present in the bulk solution. Finally, the location of the particles with respect to their lateral and vertical arrangement in the film was studied with advanced reflectivity and scattering methods. Neutron Reflectometry studies were performed to investigate the location of nanoparticles in the TLF perpendicular to the IF. For the first time, we study TLFs using grazing incidence small angle X – ray scattering (GISAXS), which is a technique sensitive to the lateral arrangement of particles in confined volumes. This work provides preliminary data on a lateral ordering of particles in the film.
Die Möglichkeiten sich zu informieren, am Leben der vielen Anderen teilzunehmen ist durch das Internet mit seinen Tweets, Google-Angeboten und sozialen Netzwerken wie Facebook ins Unermessliche gewachsen. Zugleich fühlen sich viele Nutzer überfordert und meinen, im Meer der Informationen zu ertrinken. So bekennt Frank Schirrmacher in seinem Buch Payback, dass er den geistigen Anforderungen unserer Zeit nicht mehr gewachsen ist. Sein Kopf komme nicht mehr mit. Er sei unkonzentriert, vergesslich und ständig abgelenkt. Das, was vielen zum Problem geworden ist, sehen viele Studierende eher pragmatisch. Der Wissenserwerb in Zeiten von Internet und E-Learning läuft an Hochschulen häufig nach der Helene-Hegemann-Methode ab: Zunächst machen sich die Studierenden, z.B. im Rahmen einer Studien- oder Hausarbeit, bei Wikipedia „schlau“, ein Einstieg ist geschafft. Anschließend wird dieses Wissen mit Google angereichert. Damit ist Überblickswissen vorhanden. Mit geschickter copy-and-paste-Komposition lässt sich daraus schon ein „Werk“ erstellen. Der ein oder andere Studierende gibt sich mit diesem Wissenserwerb zufrieden und bricht seinen Lernprozess hier bereits ab. Nun ist zwar am Ende jeder Studierende für seinen Wissenserwerb selbst verantwortlich. Die erkennbar unbefriedigende Situation sollte die Hochschulen aber herausfordern, das Internet in Vorlesungen und Seminaren auszuprobieren und sinnvolle Anwendungen zu entwickeln. Beispiele gibt es durchaus. Unter der Metapher E-Learning hat sich ein umfangreicher Forschungsschwerpunkt an den Universitäten entwickelt. Einige Beispiele von vielen: So hat der Osnabrücker Informatik-Professor Oliver Vornberger seine Vorlesungen als Video ins Netz gestellt. Per RSS ist es möglich, Sequenzen aufs iPod zu laden. Die übliche Dozentenangst, dann würden sie ja vor leeren Bänken sitzen, scheint unbegründet. Sie werden von den Studierenden vor allem zur Prüfungsvorbereitung genutzt. Wie ist das Internet, das für die junge Generation zu einem alles andere verdrängenden Universalmedium geworden ist, didaktisch in die Hochschullehre einzubinden? Wie also ist konkret mit diesen Herausforderungen umzugehen? Dies soll uns im Folgenden beschäftigen.
Between 2002 and 2006 the Colombian government of Álvaro Uribe counted with great international support to hand a demobilization process of right-wing paramilitary groups, along with the implementation of transitional justice policies such as penal prosecutions and the creation of a National Commission for Reparation and Reconciliation (NCRR) to address justice, truth and reparation for victims of paramilitary violence. The demobilization process began when in 2002 the United Self Defence Forces of Colombia (Autodefensas Unidas de Colombia, AUC) agreed to participate in a government-sponsored demobilization process. Paramilitary groups were responsible for the vast majority of human rights violations for a period of over 30 years. The government designed a special legal framework that envisaged great leniency for paramilitaries who committed serious crimes and reparations for victims of paramilitary violence. More than 30,000 paramilitaries have demobilized under this process between January 2003 and August 2006. Law 975, also known as the “Justice and Peace Law”, and Decree 128 have served as the legal framework for the demobilization and prosecutions of paramilitaries. It has offered the prospect of reduced sentences to demobilized paramilitaries who committed crimes against humanity in exchange for full confessions of crimes, restitution for illegally obtained assets, the release of child soldiers, the release of kidnapped victims and has also provided reparations for victims of paramilitary violence. The Colombian demobilization process presents an atypical case of transitional justice. Many observers have even questioned whether Colombia can be considered a case of transitional justice. Transitional justice measures are often taken up after the change of an authoritarian regime or at a post-conflict stage. However, the particularity of the Colombian case is that transitional justice policies were introduced while the conflict still raged. In this sense, the Colombian case expresses one of the key elements to be addressed which is the tension between offering incentives to perpetrators to disarm and demobilize to prevent future crimes and providing an adequate response to the human rights violations perpetrated throughout the course of an internal conflict. In particular, disarmament, demobilization and reintegration processes require a fine balance between the immunity guarantees offered to ex-combatants and the sought of accountability for their crimes. International law provides the legal framework defining the rights to justice, truth and reparations for victims and the corresponding obligations of the State, but the peace negotiations and conflicted political structures do not always allow for the fulfillment of those rights. Thus, the aim of this article is to analyze what kind of transition may be occurring in Colombia by focusing on the role that transitional justice mechanisms may play in political negotiations between the Colombian government and paramilitary groups. In particular, it seeks to address to what extent such processes contribute to or hinder the achievement of the balance between peacebuilding and accountability, and thus facilitate a real transitional process.