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Dietrich C.F.,Medizinische Klinik 2 | Riemer-Hommel P.,University of Applied Sciences of Saarlandes
Zeitschrift fur Gastroenterologie | Year: 2012

The German Health Care System (GHCS) faces many challenges among which an aging population and economic problems are just a few. The GHCS traditionally emphasised equity, universal coverage, ready access, free choice, high numbers of providers and technological equipment; however, real competition among health-care providers and insurance companies is lacking. Mainly in response to demographic changes and economic challenges, health-care reforms have focused on cost containment and to a lesser degree also quality issues. In contrast, generational accounting, priorisation and rationing issues have thus far been completely neglected. The paper discusses three important areas of health care in Germany, namely the funding process, hospital management and ambulatory care, with a focus on cost control mechanisms and quality improving measures as the variables of interest. Health Information Technology (HIT) has been identified as an important quality improvement tool. Health Indicators have been introduced as possible instruments for the priorisation debate. © Georg Thieme Verlag KG Stuttgart · New York. Source

Schroeder J.P.,Leibniz Institute of Marine Science | Gartner A.,Leibniz Institute of Marine Science | Waller U.,University of Applied Sciences of Saarlandes | Hanel R.,Leibniz Institute of Marine Science | Hanel R.,Johann Heinrich Von Thunen Institute
Aquaculture | Year: 2010

In marine recirculating aquaculture systems ozone, as a strong oxidant, is often used to improve water quality by reducing the pathogen load and removing inorganic and organic wastes. However, mainly when disinfection of recirculating water is desired, high ozone dosage is required, which may lead to toxicity problems for the cultured species. Acute toxicity of ozone-produced oxidants (OPO) to juvenile Pacific white shrimp, Litopenaeus vannamei, was assessed by determining the medium lethal concentration (LC50). Shrimp were exposed to a series of OPO concentrations for 96h. Toxicity was analysed using standard probit regression. The 24, 48, 72 and 96h LC50 values were 0.84, 0.61, 0.54 and 0.50mg/l chlorine equivalent, respectively. A safe level for residual oxidant concentration was calculated and further verified by chronic exposure experiments. While long-term exposure of juvenile white shrimp to an OPO concentration of 0.06mg/l revealed no observable effect, long-term exposures to 0.10 and 0.15mg/l induced incidence of soft shell syndrome which led to mortalities due to cannibalism. Thus, an OPO concentration of 0.06mg/l is suggested to be the maximum safe exposure level for rearing juvenile L. vannamei. Furthermore, we proved this safe level to be sufficient to control and reduce bacterial biomass in the recirculating process water. © 2010 Elsevier B.V. Source

Papageorgiou A.,NEC Laboratories Europe | Miede A.,University of Applied Sciences of Saarlandes | Schulte S.,Vienna University of Technology | Schuller D.,TU Darmstadt | Steinmetz R.,TU Darmstadt
Pervasive and Mobile Computing | Year: 2014

With the Internet of Services, Web services from all areas of life and business will be offered to service consumers. Even though Web service technologies make it easy to consume services on arbitrary devices due to their platform independence, service messaging is heavyweight. This may cause problems if services are invoked using devices with limited resources, e.g., smartphones. To overcome this issue, several adaptation mechanisms to decrease service messaging have been proposed. However, none of these are the best-performing under all possible system contexts. In this paper, we present a decision support system that aims at helping an operator to apply appropriate adaptation mechanisms based on the system context. We formulate the corresponding decision problem and present two scoring algorithms - one Quality of Service-based and one Quality of Experience-based. Missing data and, thus, an incomplete system context is a serious challenge for scoring algorithms. Regarding the problem at hand, missing data may lead to errors with respect to the recommended adaptation mechanisms. To address this challenge, we apply the statistical concept of imputation, i.e., substituting missing data. Based on the evaluation of different imputation algorithms used for one of our scoring algorithms, we show which imputation algorithms significantly decrease the error imposed by the missing data and decide whether imputation algorithms tailored to our scenario should be investigated. © 2013 Elsevier B.V. All rights reserved. Source

Orellana J.,Pontifical Catholic University of Valparaiso | Waller U.,University of Applied Sciences of Saarlandes | Wecker B.,Neomar GmbH
Aquacultural Engineering | Year: 2014

The development of new species is a high priority for the diversification of the Chilean aquaculture sector. The yellowtail kingfish (Seriola lalandi) is a promising candidate for commercial production in recirculating aquaculture systems (RAS). This paper presents data on the culture of yellowtail kingfish in a marine RAS working for 488 days using artificial sea water. Growth performance, feed conversion, feeding rate, condition factor and mortality were determined for fish having an average initial weight (±S.D.) of 0.7 ± 0.2. g up to a final average weight of 2006. ±. 339.0. g. The RAS configuration (drum filter, protein skimmer with ozone, biological nitrification and denitrification, carbon dioxide removal and oxygenation) showed performance stability under the conditions assayed (low water renewal rate). Total ammonia nitrogen and nitrite-nitrogen concentration averaged 0.74. ±. 0.42. mg/L and 0.21. ±. 0.24. mg/L respectively. After installation, the denitrification reactor kept nitrate-nitrogen concentrations below 40. mg/L. Nitrate-nitrogen was totally reduced at oxidation reduction potential values between -150 and -250. mV. Water temperature averaged 22.6. ±. 1.4. °C and oxygen was maintained close to saturation levels. Carbon dioxide concentration was in average 8.3. ±. 2.47. mg/L and pH 7.5. ±. 0.1. Water renewal rate was 0.45% of the total system volume per day. The system proved the capability to maintain optimal water quality and secured animal welfare. © 2013 Elsevier B.V. Source

Pohl G.,University of Applied Sciences of Saarlandes
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

In architecture, shell construction is used for the most efficient, large spatial structures. Until now the use of wood rather played a marginal role, implementing those examples of architecture, although this material offers manifold advantages, especially against the background of accelerating shortage of resources and increasing requirements concerning the energy balance. Regarding the implementation of shells, nature offers a wide range of suggestions. The focus of the examinations is on the shells of marine plankton, especially of diatoms, whose richness in species promises the discovery of entirely new construction principles. The project is targeting at transferring advantageous features of these organisms on industrial produced, modular wood shell structures. Currently a transfer of these structures in CAD - models is taking place, helping to perform stress analysis by computational methods. Micro as well as macro structures are the subject of diverse consideration, allowing to draw the necessary conclusions for an architectural design. The insights of these tests are the basis for the development of physical models on different scales, which are used to verify the different approaches. Another important aim which is promoted in the project is to enhance the competitiveness of timber construction. Downsizing of the prefabricated structural elements leads to considerable lower transportation costs as abnormal loads can be avoided as far as possible and means of transportation can be loaded with higher efficiency so that an important contribution to the sustainability in the field of architecture can also be made. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE). Source

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