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RISS 인기검색어
- 검색키워드
- 저자 : Vaas, Franz (검색결과 7 건)
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Error Analysis of Measure-Correlate-Predict Methods for Long-Term Correction of Wind Data
Franz Vaas,Hyun-Goo Kim,Hyun-Soo Seo,Seok-Woo Kim 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
In these days the installation of wind turbines or wind parks includes a high financial risk. So for the planning and the constructing of wind farms, long?term data of wind speed and wind direction is required. However, in most cases only few data are available at the designated places. Traditional Measure?Correlate?Predict (MCP) can extend this data by using data of nearby meteorological stations. But also Neural Networks can create such long?term predictions. The key issue of this paper is to demonstrate the possibility and the quality of predictions using Neural Networks. Thereto this paper compares the results of different MCP Models and Neural Networks for creating long?term data with various indexes.
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Application of Neural Network for Long-Term Correction of Wind Data
김현구(Kim, Hyun-Goo),Vaas, Franz 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.4
Wind farm development project contains high business risks because that a wind farm, which is to be operating for 20 years, has to be designed and assessed only relying on a year or little more in-situ wind data. Accordingly, long-term correction of short-term measurement data is one of most important process in wind resource assessment for project feasibility investigation. This paper shows comparison of general Measure-Correlate-Prediction models and neural network, and presents new method using neural network for increasing prediction accuracy by accommodating multiple reference data. The proposed method would be interim step to complete long-term correction methodology for Korea, complicated Monsoon country where seasonal and diurnal variation of local meteorology is very wide.
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서현수(Hyunsoo Seo),경남호(Nam-Ho Kyong),Franz Vaas,김현구(Hyun-Goo Kim) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
The long-term wind data are reconstructed from the short-term meteorological data to design the 4 MW offshore wind park which will be constructed at Woljeong-ri, Jeju island, Korea. Using two MCP (Measure-Correlate-Predict) models, the relative deviation of wind speed and direction from two neighboring reference weather stations can be regressed at each azimuth sector. The validation of the present method is checked about linear and matrix MCP models for the sets of measured data, and the characteristic wind turbulence is estimated from the ninety-percent percentile of standard deviation in the probability distribution. Using the Gumbel's model, the extreme wind speed of fifty-year return period is predicted by the reconstructed long-term data. The predicted results of this analysis concerning turbulence intensity and extreme wind speed are used for the calculation of fatigue life and extreme load in the design procedure of wind turbine structures at offshore wind farms.
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Fernando, I.P. Shanura,Jayawardena, Thilina U.,Kim, Hyun-Soo,Vaas, A.P.J.P.,De Silva, H.I.C.,Nanayakkara, C.M.,Abeytunga, D.T.U.,Lee, WonWoo,Ahn, Ginnae,Lee, Dae-Sung,Yeo, In-Kyu,Jeon, You-Jin Elsevier 2019 Life sciences Vol.233 No.-
<P><B>Abstract</B></P> <P>Increased levels of particulate matter (PM) air pollutants in East Asia have resulted in detrimental health impacts increasing morbidity and mortality. Epidemiological studies suggest a possible relation between the cutaneous exposure of PM and increased oxidative stress and inflammation which lead to skin lesions. The present study utilizes an integrated cell culture model of keratinocytes and fibroblasts to mimic viable skin layers and investigate the possible effects of PM exposure after penetration through corneocytes. The skin perfection is upheld by homeostatic functionality of epidermal cells and the integrity of connective tissues. Exposure to xenobiotics could alter the skin cell homeostasis aggravating premature skin aging. Stimulation of HaCaT keratinocytes by PM collected from Beijing, China (CPM) increased the intracellular ROS levels triggering a cascade of events aggravating inflammatory responses and connective tissue degradation. In HDF fibroblasts, treatment with preconditioned keratinocyte culture media augmented inflammatory responses, cellular differentiation, and connective tissue degradation. Above events were marked by the increased intracellular ROS, inflammatory mediators, pro-inflammatory cytokines, matrix metalloproteinases (MMP)-1 and -2 levels, collagenase, and elastase activity. Fucosterol treatment of keratinocytes dose-dependently attenuated the detrimental effects both in keratinocytes and fibroblasts restoring the conditions near to physiological levels. Further evaluations could be advanced on developing fucosterol, in forms such as rejuvenating cosmeceuticals which could attenuate detrimental responses of CPM exposure.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Fernando, I.P. Shanura,Jayawardena, Thilina U.,Kim, Hyun-Soo,Lee, Won Woo,Vaas, A.P.J.P.,De Silva, H.I.C.,Abayaweera, G.S.,Nanayakkara, C.M.,Abeytunga, D.T.U.,Lee, Dae-Sung,Jeon, You-Jin Academic Press 2019 Environmental research Vol.172 No.-
<P><B>Abstract</B></P> <P>Particulate matter (PM) air pollution has gradually become a widespread problem in East Asia. PM may cause unfamiliar inflammatory responses, oxidative stress, and pulmonary tissue damage, and a comprehensive understanding of the underlying mechanisms is required in order to develop effective anti-inflammatory agents. In this study, fine dust collected from Beijing, China (CPM) (size < PM13 with majority < PM2.5) was evaluated for its oxidative stress- and inflammation-inducing effects, which cause cell damage, in A459 human lung epithelial cells. Oxidative stress was marked by an increase in intracellular ROS levels and the production of antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), and heme oxygenase-1 (HO-1). Upon induction of oxidative stress, a marked increase was observed in the expression of key inflammatory mediators such as COX-2 and PGE<SUB>2</SUB> and the pro-inflammatory cytokines TNF-α and IL-6 via NF-kB and MAPK pathways. Cellular damage was marked by a reduction in viability, increased lactate dehydrogenase (LDH) release, formation of apoptotic and necrotic bodies, accumulation of sub-G1 phase cells, and DNA damage. Apoptosis was found to be mediated via the activation of caspases through the mitochondria-mediated pathway. Fucosterol, purified from the brown alga <I>Sargassum binderi</I> (Sonder ex J. Agardh) by bio-assay-guided fractionation and purification, exhibited potential therapeutic effects against CPM-induced detrimental effects. Further studies could focus on developing fucosterol, in forms such as steroidal inhalers, against PM-induced pulmonary tissue inflammation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fine dust air pollution is a major reason of pulmonary complications in East Asia. </LI> <LI> Dust particles induce oxidative stress and inflammation damaging the lung epithelial cells. </LI> <LI> Fucosterol suppressed the dust induced cell damage by inhibiting oxidative stress and inflammation. </LI> <LI> Fucosterol may have beneficial effects in alleviating adverse respiratory effects of air pollution. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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