Christoph G. Schütz

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Regular use of illegal drugs is suspected to cause cognitive impairments. Two substances have received heightened attention: 3,4-methylenedioxymethamphetamine (MDMA or 'ecstasy') and delta-9-tetrahydrocannabinol (THC or 'cannabis'). Preclinical evidence, as well as human studies examining regular ecstasy consumers, indicated that ecstasy use may have(More)
Application integration requires the consideration of instance data and schema data. Instance data in one application may be schema data for another application, which gives rise to multiple instantiation levels. Using deep instantiation, an object may be deeply characterized by representing schema data about objects several instantiation levels below. Deep(More)
There is evidence that the use of inhalants might prove to be a modifiable risk factor for intravenous (IV) drug use, or possibly an important vulnerability marker. However, this evidence has come from studies using samples of convenience, such as a mixture of psychiatric patients, felons, and their relatives. If there is a link between these two different(More)
Secure Multi-party Computation (SMC) enables secure distributed computation of arbitrary functions of private inputs. Multiple techniques for SMC have been well studied and can be applied within cryptographic protocols, leading to large and complex protocols. Their implementation is difficult for an average programmer to understand, time consuming and(More)
As organizations grow, decision support systems face a surging demand for information; information that must be integrated into the corporate data warehouse. Incremental integration allows for a gradual evolution of data warehouse schemas. Heterogeneous schemas complicate the integration task. Traditional modeling approaches require heterogeneities in the(More)
Conceptual models organize the data as well as the processes from a business domain using a human-readable, yet formal representation language. For static data models, various modeling approaches have been proposed to represent complex multilevel abstraction hierarchies. For process models, though, current modeling approaches do not provide a flexible and(More)
Today's dynamic business environment demands from companies variable and flexible processes. Rather than imposing a single fixed process, process models must account for the variability of real-world business problems. Many companies are hierarchically organized with top-down decision making processes. On the one hand, company policies and legal regulations(More)