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Culture and violence
(2010)
The basic assumption of this study is that specific cultural conditions may lead to psychopathological reactions through which an increase in interpersonal violence may happen. The objective of this study was to define to what extent homicide rates across national cultures might be associated with the strength of their attitudes toward specific beliefs and values, and their scores in specific cultural dimensions. To answer this question, nine independent variables were defined six of which were related to the people- attitudes pertaining importance of religion (Religiosity), excessive feeling of choice and control (Omnipotence), clear-cut distinction between good and evil (Absolutism), proud of their nationality (Nationalism), approval of competition (Competitiveness), and high respect for authorities and emphasis on obedience (Authoritarianism). The data for these variables were collected from World Values Survey. For two cultural dimensions, Collectivism, and Power Distance, Hofstede- scores were used. The 9th variable was GNI per capita. After estimation of 7% missing values in the whole data through multiple imputation, a sample of 81 nations was used for further statistical analyses.
Results: Stepwise regression analysis indicated Omnipotence and GNI as the strongest predictors of homicide (β = .44 P = .000; β = -.27 P = .006 respectively). The 9 independent variables were loaded on two factors, socio-economic development (SED) and psycho-cultural factor (Psy-Cul), which were negatively correlated (-.47). The Psy-Cul was interpreted as an indicator of narcissism, and a mediator between SED and homicide. Hierarchical cluster analysis made a clear distinction among three main groups of Western, Developing, and post-Communist nations on the basis of the two factors.
We aim to demonstrate that automated deduction techniques, in particular those following the model computation paradigm, are very well suited for database schema/query reasoning. Specifically, we present an approach to compute completed paths for database or XPath queries. The database schema and a query are transformed to disjunctive logic programs with default negation, using a description logic as an intermediate language. Our underlying deduction system, KRHyper, then detects if a query is satisfiable or not. In case of a satisfiable query, all completed paths -- those that fulfill all given constraints -- are returned as part of the computed models. The purpose of our approach is to dramatically reduce the workload on the query processor. Without the path completion, a usual XML query processor would search the database for solutions to the query. In the paper we describe the transformation in detail and explain how to extract the solution to the original task from the computed models. We understand this paper as a first step, that covers a basic schema/query reaÂsoning task by model-based deduction. Due to the underlying expressive logic formalism we expect our approach to easily adapt to more sophisticated problem settings, like type hierarchies as they evolve within the XML world.
Hyper tableaux with equality
(2007)
In most theorem proving applications, a proper treatment of equational theories or equality is mandatory. In this paper we show how to integrate a modern treatment of equality in the hyper tableau calculus. It is based on splitting of positive clauses and an adapted version of the superposition inference rule, where equations used for paramodulation are drawn (only) from a set of positive unit clauses, the candidate model. The calculus also features a generic, semantically justified simplification rule which covers many redundancy elimination techniques known from superposition theorem proving. Our main results are soundness and completeness, but we briefly describe the implementation, too.
The Living Book is a system for the management of personalized and scenario specific teaching material. The main goal of the system is to support the active, explorative and selfdetermined learning in lectures, tutorials and self study. The Living Book includes a course on 'logic for computer scientists' with a uniform access to various tools like theorem provers and an interactive tableau editor. It is routinely used within teaching undergraduate courses at our university. This paper describes the Living Book and the use of theorem proving technology as a core component in the knowledge management system (KMS) of the Living Book. The KMS provides a scenario management component where teachers may describe those parts of given documents that are relevant in order to achieve a certain learning goal. The task of the KMS is to assemble new documents from a database of elementary units called 'slices' (definitions, theorems, and so on) in a scenario-based way (like 'I want to prepare for an exam and need to learn about resolution'). The computation of such assemblies is carried out by a model-generating theorem prover for first-order logic with a default negation principle. Its input consists of meta data that describe the dependencies between different slices, and logic-programming style rules that describe the scenario-specific composition of slices. Additionally, a user model is taken into account that contains information about topics and slices that are known or unknown to a student. A model computed by the system for such input then directly specifies the document to be assembled. This paper introduces the elearning context we are faced with, motivates our choice of logic and presents the newly developed calculus used in the KMS.
The model evolution calculus
(2004)
The DPLL procedure is the basis of some of the most successful propositional satisfiability solvers to date. Although originally devised as a proof procedure for first-order logic, it has been used almost exclusively for propositional logic so far because of its highly inefficient treatment of quantifiers, based on instantiation into ground formulas. The recent FDPLL calculus by Baumgartner was the first successful attempt to lift the procedure to the first-order level without resorting to ground instantiations. FDPLL lifts to the first-order case the core of the DPLL procedure, the splitting rule, but ignores other aspects of the procedure that, although not necessary for completeness, are crucial for its effectiveness in practice. In this paper, we present a new calculus loosely based on FDPLL that lifts these aspects as well. In addition to being a more faithful litfing of the DPLL procedure, the new calculus contains a more systematic treatment of universal literals, one of FDPLL's optimizations, and so has the potential of leading to much faster implementations.
The goal of this master thesis was to develop a CRM system for the Assist team of CompuGroup Medical that is aiding in integrating open innovation into the development of the Minerva 2.0 software. To achieve this, CRM methodology has been combined with Social Networking Systems, following the research of Lin and Chen (2010, pp. 11 – 30). To achieve the predefined goals literature has been analyzed on how to successfully im- plement a CRM system as well as an online community. Subsequently the results have been applied to the development of the Minerva Community according to the guidelines of Design Science suggested by Hevner et al. (2004, pp. 75 – 104). The finished product is designed based on customer and management requirements and evaluated from a customer and company perspective.
The implementation of physiological indicators reflecting the response of organisms to changes in their environment is assumed to provide potential benefits for ecological studies. By analysing the physiological condition of organisms in freshwater ecological studies rather than their ultimate effects, physiological indicators can contribute to a faster assessment of effects than using traditional ecological indicators, such as the evaluation of the benthic community structure or the determination of the reproductive success of organisms. This can increase the effectiveness of environmental health assessment and experimental ecology. In this respect the thesis focuses on physiological measures characterizing the energetic condition and energy consumption (the concentration of energy storage compounds, the adenylate energy charge, the energy consumption in vivo), as well as individual growth (RNA:DNA ratio) of organisms. Although these sub-individual indicators are commonly applied in marine ecology and more recently in ecotoxicology, they have been rarely applied in freshwater ecology to date. With respect to an increased use of physiological indicators in freshwater ecological studies, the objectives of the present thesis are twofold. First, it highlights the potential of assessing the individual fitness by means of physiological indicators in freshwater ecological studies. For that reason, Chapter 2 provides the basic assumptions as well as the theoretical and methodological fundamentals necessary for the application of physiological indicators within freshwater ecology and, furthermore, points out their applicability by several case studies. As second objective, the thesis addresses selected ecophysiological aspects of native and non-native freshwater amphipods, which are considered suitable candidates for the determination of physiological indicators in ecological studies due to their function as keystone species within aquatic habitats. The studies presented in Chapters 3−5 of the thesis provide information on (i) species- and sex-specific seasonal variations within the energetic condition of natural Gammarus populations (G. fossarum, G. pulex), (ii) differences in metabolic activity and behaviour between different amphipod species (G fossarum, G. roeselii and D. villosus), as well as (iii) the direct effects of ambient ammonia on the physiology and behaviour of D. villosus. The fundamental conclusions drawn from the conducted field and laboratory studies, as well as their relevance and general implications for the application of physiological indicators in freshwater ecological research are discussed in Chapter 6.
SUMMARY
Buildings and infrastructures characterize the appearance of our cultural landscapes and provide essential services for the human society. However, they inevitably impact the natural environment e.g. by the structural change of habitats. Additionally, they potentially cause further negative environmental impacts due to the release of chemical substances from construction materials. Galvanic anodes and organic coatings regularly used for corrosion protection of steel structures are building materials of particular importance for the transport infrastructure. In direct contact with a water body or indirectly via the runoff after rainfall, numerous chemicals can be released into the environment and pose a risk to aquatic organisms. Up to now, there is no uniform investigation and evaluation approach for the assessment of the environmental compatibility of building products. Furthermore, galvanic anodes and organic coatings pose particular challenges for their ecotoxicological characterization due to their composition. Therefore, the objective of the presented thesis was the ecotoxicological assessment of emissions from galvanic anodes and protective coatings as well as the development of standardized assessment procedures for these materials.
The possible environmental hazard posed by the use of anodes on offshore installations was investigated on three trophic levels. To ensure a realistic and reliable evaluation, the experiments were carried out in natural seawater and under natural pH conditions. Moreover, the anode material and its main components zinc and aluminum were exposed while simulating a worst-case scenario. The anode material examined caused a weak inhibition of algae growth; no acute toxicity was observed on the luminescent bacteria and amphipods. However, an increase of aluminum and indium levels in the crustacean species was found. On the basis of these results, no direct threat has been identified for marine organisms from the use of galvanic aluminum anodes. However, an accumulation of metals in crustaceans and a resulting entry into the marine food web cannot be excluded.
The environmental compatibility of organic coating systems was exemplarily evaluated using a selection of relevant products based on epoxy resins (EP) and polyurethanes. For this purpose, coated test plates were dynamically leached over 64 days. The eluates obtained were systematically analyzed for their ecotoxicological effects (acute toxicity to algae and luminescent bacteria, mutagenic and estrogenic effects) and their chemical composition. In particular, the EP-based coatings caused significant bacterial toxicity and estrogen-like effects. The continuously released 4-tert-butylphenol was identified as a main contributor to these effects and was quantified in concentrations exceeding the predicted no effect concentration for freshwater in all samples. Interestingly, the overall toxicity was not governed by the content of 4-tert-butylphenol in the products but rather by the release mechanism of this compound from the investigated polymers. This finding indicates that an optimization of the composition can result in the reduction of emissions and thus of environmental impacts - possibly due to a better polymerization of the compounds.
Coatings for corrosion protection are exposed to rain, changes in temperature and sun light leading to a weathering of the polymer. To determine the influence of light-induced aging on the ecotoxicity of top coatings, the emissions and associated adverse effects of UV-irradiated and untreated EP-based products were compared. To that end, the investigation of static leachates was focused on estrogenicity and bacterial toxicity, which were detected in the classic microtiter plate format and in combination with thin-layer plates. Both materials examined showed a significant decrease of the ecotoxicological effects after irradiation with a simultaneous reduction of the 4-tert-butylphenol emission. However, bisphenol A and various structural analogues were detected as photolytic degradation products of the polymers, which also contributed to the observed effects. In this context, the identification of bioactive compounds was supported by the successful combination of in-vitro bioassays with chemical analysis by means of an effect-directed analysis. The presented findings provide important information to assess the general suitability of top coatings based on epoxy resins.
Within the scope of the present study, an investigation concept was developed and successfully applied to a selection of relevant construction materials. The adaptation of single standard methods allowed an individual evaluation of these products. At the same time, the suitability of the ecotoxicological methods used for the investigation of materials of unknown and complex composition was confirmed and the basis for a systematic assessment of the environmental compatibility of corrosion protection products was created. Against the background of the European Construction Products Regulation, the chosen approach can facilitate the selection of environmentally friendly products and contributes to the optimization of individual formulations by the simple comparison of different building materials e.g. within a product group.
This minor thesis shows a way to optimise a generated oracle to achieve shorter runtimes. Shorter runtimes of test cases allows the execution of more test cases in the same time. The execution of more test cases leads to a higher confidence in the software-quality. Oracles can be derived from specifications. However specifications are used for different purposes and therefore are not necessarily executable. Even if the are executable it might be with only a high runtime. Those two facts come mostly from the use of quantifiers in the logic. If the quantifier-range is not bounded, respectively if the bounds are outside the target language-datatype-limits, the specification is too expressive to be exported into a program. Even if the bounds inside the used datatype-limits, the quantification is represented as a loop which leads to a runtime blowup, especially if quantifiers are nested. This work explains four different possibilities to reduce the execution time of the oracle by manipulating the quantified formular whereas this approach is only applicable if the quantified variables are of type Integer.
E-KRHyper is a versatile theorem prover and model generator for firstorder logic that natively supports equality. Inequality of constants, however, has to be given by explicitly adding facts. As the amount of these facts grows quadratically in the number of these distinct constants, the knowledge base is blown up. This makes it harder for a human reader to focus on the actual problem, and impairs the reasoning process. We extend E-Hyper- underlying E-KRhyper tableau calculus to avoid this blow-up by implementing a native handling for inequality of constants. This is done by introducing the unique name assumption for a subset of the constants (the so called distinct object identifiers). The obtained calculus is shown to be sound and complete and is implemented into the E-KRHyper system. Synthetic benchmarks, situated in the theory of arrays, are used to back up the benefits of the new calculus.
In automated theorem proving, there are some problems that need information on the inequality of certain constants. In most cases this information is provided by adding facts which explicitly state that two constants are unequal. Depending on the number of constants, a huge amount of this facts can clutter the knowledge base and distract the author and readers of the problem from its actual proposition. For most cases it is save to assume that a larger knowledge base reduces the performance of a theorem prover, which is another drawback of explicit inequality facts. Using the unique name assumption in those reasoning tasks renders the introduction of inequality facts obsolete as the unique name assumptions states that two constants are identical iff their interpretation is identical. Implicit handling of non-identical constants makes the problems easier to comprehend and reduces the execution time of reasoning. In this thesis we will show how to integrate the unique name assumption into the E-hyper tableau calculus and that the modified calculus is sound and complete. The calculus will be implemented into the E-KRHyper theorem prover and we will show, by empiric evaluation, that the changed implementation, which is able to use the unique name assumption, is superior to the traditional version of E-KRHyper.
Many pharmaceuticals (e.g. antibiotics, contrast media, beta blockers) are excreted unmetabolized and enter wastewater treatment plants (WWTPs) through the domestic sewage system. Research has shown that many of them are not effectively removed by conventional wastewater treatment and therefore are detected in surface waters. Reverse osmosis (RO) is one of the most effective means for removing a wide range of micropollutants in water recycling. However, one significant disadvantage is the need to dispose the resultant RO concentrate. Due to the fact that there are elevated concentrations of micropollutants in the concentrate, a direct disposal to surface water could be hazardous to aquatic organisms. As a consequence, further treatment of the concentrate is necessary. In this study, ozonation was investigated as a possible treatment option for RO concentrates. Concentrate samples were obtained from a RO-membrane system which uses municipal WWTP effluents as feeding water to produce infiltration water for artificial groundwater recharge. In this study it could be shown that ozonation is efficient in the attenuation of selected pharmaceuticals, even in samples with high TOC levels (46 mg C/L). Tests with chlorinated and non-chlorinated WWTP effluent showed an increase of ozone stability, but a decrease of hydroxyl radical exposure in the samples after chlorination. This may shift the oxidation processes towards direct ozone reactions and favors the degradation of compounds with high apparent second order rate constants. Additionally it might inhibit an oxidation of compound predominantly reacting with OH radicals. Ozone reaction kinetics were investigated for beta blockers (acebutolol, atenolol, metoprolol and propranolol) which are permanently present in WWTP effluents. For beta blockers two moieties are common which are reactive towards ozone, a secondary amine group and an activated aromatic ring. The secondary amine is responsible for a pH dependence of the direct ozone reaction rate, since only the deprotonated amine reacts very quickly. At pH 7 acebutolol, atenolol and metoprolol reacted with ozone with an apparent second order rate constant of about 2000 M-1 s-1, whereas propranolol reacted at ~1.0 105 M-1 s-1. The rate constants for the reaction of the selected compounds with OH radicals were determined to be 0.5-1.0 x 1010 M-1 s-1. Oxidation products (OPs) formed during ozonation of metoprolol and propranolol were identified via liquid chromatography (LC) tandem mass spectrometry. Ozonation led to a high number of OPs being formed. Experiments were carried out in MilliQ-water at pH 3 and pH 8 as well as with and without the radical scavenger tertiary butanol (t-BuOH). This revealed the influence of pH and the OH radical exposure on OP formation. The OH radical exposure was determined by adding the probe compound para-chlorobenzoic acid (pCBA). Metoprolol: To define the impacts of the protonated and non protonated metoprolol species on OH radical formation, the measured pCBA attenuation was compared to modeled values obtained by a simplified kinetic model (Acuchem). A better agreement with the measured results was obtained, when the model was based on a stoichiometric formation of OH radical precursors (O2-) during the primary ozone reaction of metoprolol. However, for reaction of a deprotonated molecule (attack of the aromatic ring) a formation of O2- could be confirmed, but an assumed stoichiometric O2- formation over-estimated the formation of OH radicals in the system. Analysis of ozonated raw wastewater and municipal WWTP effluent spiked with 10 μM metoprolol exhibited a similar OP formation pattern as detected in the reaction system at pH 8 without adding radical scavenger. This indicated a significant impact of OH radical exposure on the formation of OPs in real wastewater matrices. Propranolol: The primary ozonation product of propranolol (OP-291) was formed by an ozone attack of the naphthalene ring, which resulted in a ring opening and two aldehyde moieties being formed. OP-291 was further oxidized to OP-307, presumably by an OH radical attack, which was then further oxidized to OP-281. Reaction pathways via ozone as well as OH radicals were proposed and confirmed by the chemical structures identified with MS2 and MS3 data. It can be concluded that ozonation of WWTP effluent results in the formation of a high number of OPs with an elevated toxic potential (i.e. formation of aldehydes).
Fate and effects of insecticides in vegetated agricultural drainage ditches and constructed wetlands
(2006)
Studies have shown that runoff and spray-drift are important sources of nonpoint-source pesticide pollution of surface waters. Owing to this, public concern over the presence of pesticides in surface and ground water has resulted in intensive scientific efforts to find economical, yet environmentally sound solutions to the problem. The primary objective of this research was to assess the effectiveness of vegetated aquatic systems in providing buffering between natural aquatic ecosystems and agricultural landscape following insecticide associated runoff and spray-drift events. The first set of studies were implemented using vegetated agricultural ditches, one in Mississippi, USA, using pyrethroids (bifenthrin, lambda-cyhalothrin) under simulated runoff conditions and the other in the Western Cape, South Africa using the organophosphate insecticide, azinphos-methyl (AZP), under natural runoff and spray-drift conditions. The second set of studies were implemented using constructed wetlands, one in the Western Cape using AZP under natural spray-drift conditions and the other in Mississippi, USA using the organophosphate MeP under simulated runoff conditions. Results from the Mississippi-ditch study indicated that ditch lengths of less than 300 m would be sufficient to mitigate bifenthrin and lambda-cyhalothrin. In addition, data from mass balance calculations determined that the ditch plants were the major sink (generally > 90%) and/or sorption site for the rapid dissipation of the above pyrethroids from the water column. Similarly, results from the ditch study in South Africa showed that a 180 m vegetated system was effective in mitigating AZP after natural spray drift and low flow runoff events. Analytical results from the first wetland study show that the vegetated wetland was more effective than the non-vegetated wetland in reducing loadings of MeP. Mass balance calculations indicated approximately 90% of MeP mass was associated with the plant compartment. Ninety-six hours after the contamination, a significant negative acute effect of contamination on abundances was found in 8 out of the 15 macroinvertebrate species in both wetland systems. Even with these toxic effects, the overall reaction of macroinvertebrates clearly demonstrated that the impact of MeP in the vegetated wetland was considerably lower than in the non-vegetated wetland. Results from the constructed wetland study in South Africa revealed that concentrations of AZP at the inlet of the 134 m wetland system were reduced by 90% at the outlet. Overall, results from all of the studies in this thesis indicate that the presence of the plant compartment was essential for the effective mitigation of insecticide contamination introduced after both simulated and natural runoff or spray-drift events. Finally, both the vegetated agricultural drainage ditch and vegetated constructed wetland systems studied would be effective in mitigating pesticide loadings introduced from either runoff or spray-drift, in turn lowering or eliminating potential pesticide associated toxic effects in receiving aquatic ecosystems. Data produced in this research provide important information to reduce insecticide risk in exposure assessment scenarios. It should be noted that incorporating these types of best management practices (BMPs) will decrease the risk of acute toxicity, but chronic exposure may still be an apparent overall risk.
Introduction:
In March 2012 a secessionist-Islamist insurgency gained momentum in Mali and quickly took control of two-thirds of the state territory. Within weeks radical Islamists, drug smugglers and rebels suddenly ruled over a territory bigger than Germany. News of the abuse of the population and the introduction of harsh Sharia law spread soon, and word got out that the Malian Army had simply abandoned the land. The general echo of the IC was surprise, a reaction that was, as this research will show, as unfunded as it was unconstructive*. When Malian state structures collapsed, the world watched in shock, even though the developments couldhave been anticipated –and prevented. Ultimately, the situation had to be resolved by international forces (most notably French troops), who are still in Mali at the time of writing (Arieff 2013a: 5; Lohmann 2012: 3; Walther and Christopoulos 2015: 514f.; Shaw 2013: 204; Qantara, Interview, 2012;L’Express, Mali, 2015; Deutscher Bundestag, MINUSMA und EUTM Mali, 2016; UN, MUNISMA, 2016; Boeke and Schuurmann 2015: 801; Chivvis 2016: 93f.).
This research will show that the developments in Mali in 2012 have been developing for a long time and could have been avoided. In doing so, it will also show why state security can never be analyzed or consolidated in an isolated manner. Instead, it is necessary to take into account regional dynamics and developments in order to find a comprehensive approach to security in individual states. Once state failure occurs, not only does the state itself fail, but the surrounding region equally failed to prevent the failure.
Weak states are a growing concern in many world regions, particularly in Africa. As international intervention often proves unsustainable for various reasons*, the author believes that states which cannot stabilize themselves need a regional agent to support them. This regional agent should be a Regional Security Complex (RSC) asdefined by Barry Buzan and Ole Waever (Buzan and Waever 2003). As the following analysis will show, Mali is a case in point. The hope is that this study will help avoid similar failures in the future by making a strong case for the establishment of RSC’s.
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This dissertation introduces a methodology for formal specification and verification of user interfaces under security aspects. The methodology allows to use formal methods pervasively in the specification and verification of human-computer interaction. This work consists of three parts. In the first part, a formal methodology for the description of human-computer interaction is developed. In the second part, existing definitions of computer security are adapted for human-computer interaction and formalized. A generic formal model of human-computer interaction is developed. In the third part, the methodology is applied to the specification and verification of a secure email client.
In scientific data visualization huge amounts of data are generated, which implies the task of analyzing these in an efficient way. This includes the reliable detection of important parts and a low expenditure of time and effort. This is especially important for the big-sized seismic volume datasets, that are required for the exploration of oil and gas deposits. Since the generated data is complex and a manual analysis is very time-intensive, a semi-automatic approach could on one hand reduce the time required for the analysis and on the other hand offer more flexibility, than a fully automatic approach.
This master's thesis introduces an algorithm, which is capable of locating regions of interest in seismic volume data automatically by detecting anomalies in local histograms. Furthermore the results are visualized and a variety of tools for the exploration and interpretation of the detected regions are developed. The approach is evaluated by experiments with synthetic data and in interviews with domain experts on the basis of real-world data. Conclusively further improvements to integrate the algorithm into the seismic interpretation workflow are suggested.
In the new epoch of Anthropocene, global freshwater resources are experiencing extensive degradation from a multitude of stressors. Consequently, freshwater ecosystems are threatened by a considerable loss of biodiversity as well as substantial decrease in adequate and secured freshwater supply for human usage, not only on local scales, but also on regional to global scales. Large scale assessments of human and ecological impacts of freshwater degradation enable an integrated freshwater management as well as complement small scale approaches. Geographic information systems (GIS) and spatial statistics (SS) have shown considerable potential in ecological and ecotoxicological research to quantify stressor impacts on humans and ecological entitles, and disentangle the relationships between drivers and ecological entities on large scales through an integrated spatial-ecological approach. However, integration of GIS and SS with ecological and ecotoxicological models are scarce and hence the large scale spatial picture of the extent and magnitude of freshwater stressors as well as their human and ecological impacts is still opaque. This Ph.D. thesis contributes novel GIS and SS tools as well as adapts and advances available spatial models and integrates them with ecological models to enable large scale human and ecological impacts identification from freshwater degradation. The main aim was to identify and quantify the effects of stressors, i.e climate change and trace metals, on the freshwater assemblage structure and trait composition, and human health, respectively, on large scales, i.e. European and Asian freshwater networks. The thesis starts with an introduction to the conceptual framework and objectives (chapter 1). It proceeds with outlining two novel open-source algorithms for quantification of the magnitude and effects of catchment scale stressors (chapter 2). The algorithms, i.e. jointly called ATRIC, automatically select an accumulation threshold for stream network extraction from digital elevation models (DEM) by assuring the highest concordance between DEM-derived and traditionally mapped stream networks. Moreover, they delineate catchments and upstream riparian corridors for given stream sampling points after snapping them to the DEM-derived stream network. ATRIC showed similar or better performance than the available comparable algorithms, and is capable of processing large scale datasets. It enables an integrated and transboundary management of freshwater resources by quantifying the magnitude of effects of catchment scale stressors. Spatially shifting temporal points (SSTP), outlined in chapter 3, estimates pooled within-time series (PTS) variograms by spatializing temporal data points and shifting them. Data were pooled by ensuring consistency of spatial structure and temporal stationarity within a time series, while pooling sufficient number of data points and increasing data density for a reliable variogram estimation. SSTP estimated PTS variograms showed higher precision than the available method. The method enables regional scale stressors quantification by filling spatial data gaps integrating temporal information in data scarce regions. In chapter 4, responses of the assumed climate-associated traits from six grouping features to 35 bioclimatic indices for five insect orders were compared, their potential for changing distribution pattern under future climate change was evaluated and the most influential climatic aspects were identified (chapter 4). Traits of temperature preference grouping feature and the insect order Ephemeroptera exhibited the strongest response to climate as well as the highest potential for changing distribution pattern, while seasonal radiation and moisture were the most influential climatic aspects that may drive a change in insect distribution pattern. The results contribute to the trait based freshwater monitoring and change prediction. In chapter 5, the concentrations of 10 trace metals in the drinking water sources were predicted and were compared with guideline values. In more than 53% of the total area of Pakistan, inhabited by more than 74 million people, the drinking water was predicted to be at risk from multiple trace metal contamination. The results inform freshwater management by identifying potential hot spots. The last chapter (6) synthesizes the results and provides a comprehensive discussion on the four studies and on their relevance for freshwater resources conservation and management.
Artificial intelligence (AI) is of rising importance in these days. AI is increasingly used in various company fields. Nonetheless, no high-quality scientific sources could be found stating the use of AI in the field of leadership. This research gap is addressed with this elaboration by performing expert interviews with leaders. In total seventeen companies could be questioned. The results indicate that AI is not widely used in leadership yet since only one company uses it currently and just about 10% of the participants plan the implementation in the closer feature. While the following items ex- plain why companies want to use AI in leadership: Chances for automation, time and cost savings, many important disadvantages and issues prevent companies from actively using it now: No areas of application are known, no need justifies the use, human interactions as a key aspect of leadership is reduced and it is hard to collect all necessary data. Beyond that, it was aimed to identify changes in the field of leadership through the use of AI. This objective could not be addressed due to the limited number of participants using AI in leadership.
Keywords: Leadership, artificial intelligence, transformation, state-of-use
The industry standard Decision Model and Notation (DMN) has enabled a new way for the formalization of business rules since 2015. Here, rules are modeled in so-called decision tables, which are defined by input columns and output columns. Furthermore, decisions are arranged in a graph-like structure (DRD level), which creates dependencies between them. With a given input, the decisions now can be requested by appropriate systems. Thereby, activated rules produce output for future use. However, modeling mistakes produces erroneous models, which can occur in the decision tables as well as at the DRD level. According to the Design Science Research Methodology, this thesis introduces an implementation of a verification prototype for the detection and resolution of these errors while the modeling phase. Therefore, presented basics provide the needed theoretical foundation for the development of the tool. This thesis further presents the architecture of the tool and the implemented verification capabilities. Finally, the created prototype is evaluated.