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The article deals with the responsibility of the financial sector under criminal law in Germany. This question has been of special interest since the beginning of the financial crisis. The author argues that the transactions of asset-backed securities based on American subprime mortgages fulfill all legal elements of the criminal offence "breach of trust" (Untreue). From the author's point of view, the people's legal loyalty would be severely affected if there were no criminal proceedings against such bankers who purchased those toxic asset-backed securities without sufficient information on their structure and value. Refraining from criminal prosecution even in cases causing high loss would send a dangerous signal towards the investment banking industry.
The visualization of relational data is at the heart of information visualization. The prevalence of visual representations for this kind of data is based on many real world examples spread over many application domains: protein-protein interaction networks in the field of bioinformatics, hyperlinked documents in the World Wide Web, call graphs in software systems, or co-author networks are just four instances of a rich source of relational datasets. The most common visual metaphor for this kind of data is definitely the node-link approach, which typically suffers from visual clutter caused by many edge crossings. Many sophisticated algorithms have been developed to layout a graph efficiently and with respect to a list of aesthetic graph drawing criteria. Relations between objects normally change over time. Visualizing the dynamics means an additional challenge for graph visualization researchers. Applying the same layout algorithms for static graphs to intermediate states of dynamic graphs may also be a strategy to compute layouts for an animated graph sequence that shows the dynamics. The major drawback of this approach is the high cognitive effort for a viewer of the animation to preserve his mental map. To tackle this problem, a sophisticated layout algorithm has to inspect the whole graph sequence and compute a layout with as little changes as possible between subsequent graphs. The main contribution and ultimate goal of this thesis is the visualization of dynamic compound weighted multi directed graphs as a static image that targets at visual clutter reduction and at mental map preservation. To achieve this goal, we use a radial space-filling visual metaphor to represent the dynamics in relational data. As a side effect the obtained pictures are very aesthetically appealing. In this thesis we firstly describe static graph visualizations for rule sets obtained by extracting knowledge from software archives under version control. In a different work we apply animated node-link diagrams to code-developer relationships to show the dynamics in software systems. An underestimated visualization paradigm is the radial representation of data. Though this kind of data has a long history back to centuries-old statistical graphics, only little efforts have been done to fully explore the benefits of this paradigm. We evaluated a Cartesian and a radial counterpart of a visualization technique for visually encoding transaction sequences and dynamic compound digraphs with both an eyetracking and an online study. We found some interesting phenomena apart from the fact that also laymen in graph theory can understand the novel approach in a short time and apply it to datasets. The thesis is concluded by an aesthetic dimensions framework for dynamic graph drawing, future work, and currently open issues.
During and after application, pesticides enter the atmosphere by volatilisation and by wind erosion of particles on which the pesticide is sorbed. Measurements at application sites revealed that sometimes more than half of the amount applied is lost into the atmosphere within a few days. The atmosphere is an important part of the hydrologic cycle that can transport pesticides from their point of application and deposit them into aquatic and terrestrial ecosystems far from their point of use. In the region of Trier pesticides are widely used. In order to protect crops from pests and increase crop yields in the viniculture, six to eight pesticide applications take place between May and August. The impact that these applications have on the environmental pollution of the region is not yet well understood. The present study was developed to characterize the atmospheric presence, temporal patterns, transport and deposition of a variety of pesticides in the atmosphere of the area of Trier. To this purpose, rain samples were weekly collected at eight sites during the growing seasons 2000, 2001 and 2002, and air samples (gas and particle phases) were collected during the growing season 2002. Multiresidue analysis methods were developed to determine multiple classes of pesticides in rain water, particle- and gas-phase samples. Altogether 24 active ingredients and 3 metabolites were chosen as representative substances, focussing mainly on fungicides. Twenty-four of the 27 measured pesticides were detected in the rain samples; seventeen pesticides were detected in the air samples. The most frequently detected pesticides and at the highest concentrations, both in rain and air, were compounds belonging to the class of fungicides. The insecticide methyl parathion was also detected in several rain samples as well as two substances that are banned in Germany, such as the herbicides atrazine and simazine. Concentration levels varied during the growing season with the highest concentrations being measured in the late spring and summer months, coinciding with application times and warmer months. Concentration levels measured in the rain samples were, generally, in the order of rnng l-1. Though average concentrations for single substances were less than 100 ng l-1, total concentrations were considerable and in some instances well above the EU drinking water quality standard of 500 ng l-1 for total pesticides. Compared to the amounts applied for pest control, the amounts deposited by rain resulted between 0,004% and 0,10% of the maximum application rates. These low pesticide inputs from precipitation to surface-water bodies is not of concern in vinicultural areas where the impact of other sources, such as superficial runoff inputs from the treated areas and cleaning of field crop sprayers, is more important. However, the potential impacts of these aerial pesticide inputs to non-target sites, such as organic crops, and sensitive ecosystems are as yet not known. Concentration levels in the air samples were in the order of ng m-3 at sites close to the fields were pesticides were applied, while lower values, in the order of pg m-3, were detected at the site located further away from fields where applications were performed. The measured air concentration levels found in this study do not represent a concern for human health in terms of acute risk. Inhalation toxicity studies have shown that an acute potential risk only arises at air concentrations in the range of g m-3. Finally, it must be kept in mind that only a small number of chemicals that were applied in the area were analysed for in this study. In order to gain a better evaluation of the local atmospheric load of pesticides, a wider spectrum of applied substances (including metabolites) needs to be investigated.
The catechol-O-methyltransferase gene (COMT) plays a crucial role in the metabolism of catecholamines in the frontal cortex. A single nucleotide polymorphism (Val158Met SNP, rs4680) leads to either methionine (Met) or valine (Val) at codon 158, resulting in a three- to fourfold reduction in COMT activity. The aim of the present study was to assess the COMT Val158Met SNP as a risk factor for attention-deficit/hyperactivity disorder (ADHD), ADHD symptom severity and co-morbid conduct disorder (CD) in 166 children with ADHD. The main finding of the present study is that the Met allele of the COMT Val158Met SNP was associated with ADHD and increased ADHD symptom severity. No association with co-morbid CD was observed. In addition, ADHD symptom severity and early adverse familial environment were positive predictors of lifetime CD. These findings support previous results implicating COMT in ADHD symptom severity and early adverse familial environment as risk factors for co-morbid CD, emphasizing the need for early intervention to prevent aggressive and maladaptive behavior progressing into CD, reducing the overall severity of the disease burden in children with ADHD.
Although it has been demonstrated that nociceptive processing can be modulated by heterotopically and concurrently applied noxious stimuli, the nature of brain processes involved in this percept modulation in healthy subjects remains elusive. Using functional magnetic resonance imaging (fMRI) we investigated the effect of noxious counter-stimulation on pain processing. FMRI scans (1.5 T; block-design) were performed in 34 healthy subjects (median age: 23.5 years; range: 20-31 yrs.) during combined and single application (duration: 15 s; ISI=36 s incl. 6 s rating time) of noxious interdigital-web pinching (intensity range: 6-15 N) and contact-heat (45-49 -°C) presented in pseudo-randomized order during two runs separated by approx. 15 min with individually adjusted equi-intense stimuli. In order to control for attention artifacts, subjects were instructed to maintain their focus either on the mechanical or on the thermal pain stimulus. Changes in subjective pain intensity were computed as percent differences (∆%) in pain ratings between single and heterotopic stimulation for both fMRI runs, resulting in two subgroups showing a relative pain increase (subgroup P-IN, N=10) vs. decrease (subgroup P-DE, N=12). Second level and Region of Interest analysis conducted for both subgroups separately revealed that during heterotopic noxious counter-stimulation, subjects with relative pain decrease showed stronger and more widespread brain activations compared to subjects with relative pain increase in pain processing regions as well as a fronto-parietal network. Median-split regression analyses revealed a modulatory effect of prefrontal activation on connectivity between the thalamus and midbrain/pons, supporting the proposed involvement of prefrontal cortex regions in pain modulation. Furthermore, the mid-sagittal size of the total corpus callosum and five of its subareas were measured from the in vivo magnetic resonance imaging (MRI) recordings. A significantly larger relative truncus size (P=.04) was identified in participants reporting a relative decrease of subjective pain intensity during counter-stimulation, when compared to subjects experiencing a relative pain increase. The above subgroup differences observed in functional and structural imaging data are discussed with consideration of potential differences in cognitive and emotional aspects of pain modulation.
Interoception - the perception of bodily processes - plays a crucial role in the subjective experience of emotion, consciousness and symptom genesis. As an alternative to interoceptive paradigms that depend on the participants" active cooperation, five studies are presented to show that startle methodology may be employed to study visceral afferent processing. Study 1 (38 volunteers) showed that startle responses to acoustic stimuli of 105 dB(A) intensity were smaller when elicited during the cardiac systole (R-wave +230 ms) as compared to the diastole (R +530 ms). In Study 2, 31 diabetic patients were divided into two groups with normal or diminished (< 6 ms/mmHg) baroreflex sensitivity (BRS) of heart rate control. Patients with normal BRS showed a startle inhibition during the cardiac systole as was found for healthy volunteers. Diabetic patients with diminished BRS did not show this pattern. Because diminished BRS is an indicator of impaired baro-afferent signal transmission, we concluded that cardiac modulation of startle is associated with intact arterial baro-afferent feedback. Thus, pre-attentive startle methodology is feasible to study visceral afferent processing. rnVisceral- and baro-afferent information has been found to be mainly processed in the right hemisphere. To explore whether cardiac modulation of startle eye blink is lateralized as well, in Study 3, 37 healthy volunteers received 160 unilateral acoustic startle stimuli presented to both ears, one at a time (R +0, 100, 230, 530 ms). Startle response magnitude was only diminished at R +230 ms and for left-ear presentation. This lateralization effect in the cardiac modulation of startle eye blink may reflect the previously described advantages of right-hemispheric brain structures in relaying viscero- and baro-afferent signal transmission. rnThis lateralization effect implies that higher cognitive processes may also play a role in the cardiac modulation of startle. To address this question, in Study 4, 25 volunteers responded first by 'fast as possible' button pushes (reaction time, RT), and second, rated perceived intensity of 60 acoustic startle stimuli (85, 95, or 105 dB; R +230, 530 ms). RT was divided into evaluation and motor response time. Increasing stimulus intensity enhanced startle eye blink, intensity ratings, and RT components. Eye blinks and intensity judgments were lower when startle was elicited at a latency of R +230 ms, but RT components were differentially affected. It is concluded that the cardiac cycle affects the attentive processing of acoustic startle stimuli. rnBeside the arterial baroreceptors, the cardiopulmonary baroreceptors represent another important system of cardiovascular perception that may have similar effects on startle responsiveness. To clarify this issue, in Study 5, Lower Body Negative Pressure at gradients of 0, -10, -20, and -30 mmHg was applied to unload cardiopulmonary baroreceptors in 12 healthy males, while acoustic startle stimuli were presented (R +230, 530 ms). Unloading of cardiopulmonary baroreceptors increased startle eye blink responsiveness. Furthermore, the effect of relative loading/unloading of arterial baroreceptors on startle eye blink responsiveness was replicated. These results demonstrate that the loading status of cardiopulmonary baroreceptors also has an impact on brainstem-based CNS processes. rnThus, the cardiac modulation of acoustic startle is feasible to reflect baro-afferent signal transmission of multiple neural sources, it represents a pre-attentive method that is independent of active cooperation, but its modulatory effects also reach higher cognitive, attentive processes.rn
In Beloved, Jazz and Paradise, Toni Morrison negotiates ways of individual and collective identity formation through figurations of space and trauma. In geographical spaces that are public and private, open and closed, inclusive and exclusive, space of the past and spaces of the present, Morrison writes discursive spaces in which to create individual and communal African American history and identity, based on the traumatic hi-stories at the core of the Black American experience: the Middle Passage, slavery, Jim Crow and the Civil Rights Movement, just to name a few. In the three novels, Toni Morrison subscribes to a postmodern notion of space and place, presenting it as relative to the individual- frame of mind. Places are used as metonymies for the protagonists" traumatized minds and their different ways of dealing with trauma. Trauma that is not worked through and transcended is presented by Morrison as impacting the protagonists- ability to fashion a home out of a vast and often hostile space. The physical and mental space of Morrison- protagonists is occupied by historical traumata that disables the protagonists to find a place in the present without revisiting the places of their troubled past. While this burdens their lives, it also opens up a historical and metahistorical discourse that allows the revision of mainstream historiography to include minority histories of oppression and trauma. Morrison reconfigures the American historical landscape by emphasizing the subjectivity of any history and offering alternatives to historical grand narratives through her historiographic metafiction. All three novels explore the possibility of reconciliation between past trauma and present life. Doing so requires Morrison to send her protagonists on strenuous journeys through time and space in order to visit the past trauma that keeps them from making a home in the here and now. The protagonists venture back to the primal scenes that bear major significance for their lives but have been suppressed for being too painful to remember. Their pain thus awakens anew, but out of it grow the possibility of a life in the present and the hope for a future. The pasts Morrison thus digs up serve as anchors to situate the African American place in the American historical landscape. Those primal places have a geographical as well as a historical and psychological quality, as places in Morrison- novels are often used as metonymies for the protagonists" traumatized minds, containing the memory of the traumatic past. By spatializing time, Morrison makes history accessible to a communal working through, thus countering the modernist impulse to treat memory as a private faculty embedded in the individual- psyche. This makes it difficult, for African Americans with individual recollections of slavery and racist oppression for example, to use traumatic memory as the basis for a common sense of identity. Morrison uses spatialized time as a forum to discover this basis, to allow for the establishment of a common historical bond. At the same time, she warns against instrumentalizing a common history to exclude those who do not share it. Any history, for Morrison, should be open and flexible enough to accommodate different perspectives. Essentially, Morrison suggests that western historiography is a discursive construct. By allowing, in all three novels, a polyphonic weaving of different equal histories to destablize a single, authoritative, hegemonic historiography, Morrison gives African Americans the power to construct her own past, her own present, and thereby claim back her identity. Moreover, Morrison destabilizes the duality of private space and public space that has long served to distinguish subjective individual memory from objective communal history and thus to legitimize certain accounts of history at the expense of others. The gendered as well as the racial other, by virtue of being excluded from the public sphere, have been excluded from their own historicization. By opening up the private sphere of personal trauma and loss, Morrison spatializes personal memory in a way that it forms a parallel public sphere in which African Americans may negotiate their historicity, move out of the timelessness of the private into the historicized public. By opening up the traditionally private sphere of the home to the public and turning it into a deeply political place, Morrison redefines home in a way that it does not necessarily conform to the classic view of a closed-off shelter but rather a transient place with flexible boundaries that allows for the formation of liberated individual and communal identities out of (hi)stories of pain and trauma.
One mechanism underlying the acquisition of interpersonal attitudes is the formation of an association between a valenced unconditioned stimulus (US) and an affectively neutral conditioned stimulus (CS). However, a stimulus (e.g., a person) is not always and necessarily perceived to be unambiguously positive or negative. An individual can be negative regarding abstract (trait) information but at the same time display a positive (concrete) behavior. The present research deals with the question of whether the valence of abstract or concrete information about a US is encoded and subsequently transferred to an associated CS. The central assumptions are that the valence of the concrete information is more important for the evaluation of the US, whereas the abstract information is more important for the evaluation of the CS. The rationale behind these assumptions is that the US is a psychologically proximal stimulus because it elicits a more direct affective reaction. The CS, however, is psychologically more distal because it is merely associated with the US and is therefore only experienced indirectly. It is postulated that the associative relation between US and CS constitutes a dimension of psychological distance. In four studies, the valence of abstract and concrete information about a number of USs was manipulated. Within an evaluative learning paradigm, these stimuli were associated with affectively neutral CSs. As predicted, ambivalent USs were evaluated according to the valence of the concrete information. The evaluation of CSs, however, was influenced more strongly by the valence of the abstract information. Moreover, in a subsequent lexical decision task, participants were faster to categorize abstract (vs. concrete) stimuli when the stimuli were preceded by a CS prime as compared to a US prime. The results provide first evidence that perceived psychological distance influences the evaluations of US and CS in an associative evaluative learning paradigm.
The reduction of information contained in model time series through the use of aggregating statistical performance measures is very high compared to the amount of information that one would like to draw from it for model identification and calibration purposes. It is readily known that this loss imposes important limitations on model identification and -diagnostics and thus constitutes an element of the overall model uncertainty as essentially different model realizations with almost identical performance measures (e.g. r-² or RMSE) can be generated. In three consecutive studies the present work proposes an alternative approach towards hydrological model evaluation based on the application of Self-Organizing Maps (SOM; Kohonen, 2001). The Self-Organizing Map is a type of artificial neural network and unsupervised learning algorithm that is used for clustering, visualization and abstraction of multidimensional data. It maps vectorial input data items with similar patterns onto contiguous locations of a discrete low-dimensional grid of neurons. The iterative training of the SOM causes the neurons to form a discrete, data-compressed representation of the high-dimensional input data. Using appropriate visualization techniques, information on distributions, patterns and relationships in complex data sets can be extracted. Irrespective of their potential, SOM applications have earned very little attention in hydrological modelling compared to other artificial neural network techniques. Therefore, the aim of the present work is to demonstrate that the application of Self-Organizing Maps has very high potential to address fundamental issues of model evaluation: It is shown that the clustering and classification of model time series by means of SOM can provide useful insights into model behaviour. In combination with the diagnostic properties of Signature Indices (Gupta et al., 2008; Yilmaz et al., 2008) SOM provides a novel tool for interpreting the model parameters in the hydrological context and identifying parameter sets that simultaneously meet multiple objectives, even if the corresponding model realizations belong to different models. Moreover, the presented studies and reviews also encourage further studies on the application of SOM in hydrological modelling.
This thesis presents a study of tsunami deposits created by the 2004 Indian Ocean tsunami at the Thai Andaman coast. The outcomes of a study are the characteristics of tsunami deposit for paleo-tsunami database, the identification of major sediment layers in tsunami deposit and the reconstructing tsunami run-ups from the characteristics of tsunami deposit for a coastal development program. The investigations of tsunami deposit are made almost 3 years after the event. Field investigations characterize the tsunami deposit as a distinct sediment layer variable in thickness of gray sand deposited with an erosional basis on a pre-existing soil. The best location for the observation of recent tsunami deposit is the area located about 50-200 m inland from the coastline. In most cases, the deposit layer is normally graded. In some cases, the deposit contains rip-up clasts of muddy soils and/or organic matters. The tsunami deposits are compared with three deposits from coastal sub-environments. The mean grain-size and standard deviation of deposits show that the shoreface deposits are fine to very fine sand, poorly to moderately well sorted; the swash zone deposits are coarse to fine sand, poorly to well sorted; the berm/dune deposits are medium to fine sand, poorly to well sorted; and the tsunami deposits are coarse to very fine sand, poorly to moderately well sorted. The plots of deposit mean grain-size versus sorting indicate that the tsunami deposits are composed of shoreface deposits, swash zone deposits and berm/dune deposits as well. The vertical variation of the texture of tsunami deposit shows that the mean grain-size fines upward and fining landward. The analysis and interpretation of the run-up numbers from the characteristics of tsunami deposits get three run-ups for the 2004 Indian Ocean tsunami at the Thai Andaman coast. It corresponds to field observations from the eye-witness reports and local people- affirmations. The total deposition is a major transportation pattern of onshore tsunami sediments. The sediments must fine in the direction of transport. In general, the major origins of the sediment are the swash zone and berm/dune zone where coarse to medium sand is a significant material, the minor origin of tsunami sediment is a shoreface where a significant material is fine to very fine sand. Only at an area with flat slope shorface, the major origin of tsunami sediment is the shoreface. The thicknesses, the mean grain-sizes, and the standard deviations of tsunami deposits are used to evaluate the influences of coastal morphology on the sediment characteristics. The evaluations show that the tsunami affected areas were attacked by the variable energy waves. Wave energies at the direct tsunami wave affected areas are higher than at the indirect tsunami wave affected areas. Tsunami wave energy is highly dissipated at an area with steep slope shoreface. In the same way, tsunami run-up energy is highly dissipated at an area with steep slope onshore. A channel paralleled to the coastline decreases the run-up velocity, slightly dissipates run-up energy. The road and pond highly influence the characteristics of tsunami deposit and tsunami run-up. A road obstructs the run-up velocity, dissipates run-up energy. A pond decreases run-up velocity, dissipates run-up energy. The characteristics of tsunami deposit can be interpreted for reconstructing the characteristics of tsunami run-up such as a run-up height and a flow velocity. Soulsby et al.(2007)- model is applied for reconstructing tsunami run-up at the study areas. The input parameters are sediment grain-size and sediment inundation distance. Ao Kheuy beach and Khuk Khak beach, Phang Nga province, Thailand are the areas listed for reconstructing tsunami run-up. The evaluated run-up heights are 4.2-4.9 m at Ao Kheuy beach, and 5.4-9.4 m at Khuk Khak beach. The evaluated run-up velocities are 12.8-19.2 m/s (maximum) and 0.2-1.9 m/s (mean) at the coastline and onshore, respectively. Hence, a reasonably good agreement between the evaluated and observed run-up is found. Tsunami run-up height and velocity can be used for coastal development and risk management in the tsunami affected areas. The case studies from the Thai Andaman coast suggest that in the area from coastline to about 70-140 m inland was flooded by the high velocity (high energy) run-ups, and those run-up energies were dissipated there. That area ought to be a non-residential area or a physical protection construction area (flood barrier, forest planting, etc.).