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Academic literature on the topic 'GTS model'

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Published: 4 June 2021
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Journal articles on the topic "GTS model"

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Amin, Yasmin M., and Amr T. Abdel-Hamid. "A Simulation Model of IEEE 802.15.4 GTS Mechanism and GTS Attacks in OMNeT++ / MiXiM + NETA." Computer and Information Science 11, no. 1 (January 27, 2018): 78. http://dx.doi.org/10.5539/cis.v11n1p78.

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The IEEE 802.15.4 standard defines the PHY and MAC layer specifications for Low-Rate Wireless Personal Area Networks (LR-WPANs). With the proliferation of many time-critical applications with real-time delivery, low latency, and/or specific bandwidth requirements, Guaranteed Time Slots (GTS) are increasingly being used for reliable contention-free data transmission by nodes within beacon-enabled WPANs. To evaluate the performance of the 802.15.4 GTS management scheme, this paper introduces a new GTS simulation model for OMNeT++ / MiXiM. Our GTS model considers star-topology WPANs within the 2.4 GHz frequency band, and is in full conformance with the IEEE 802.15.4 – 2006 standard. To enable thorough investigation of the behaviors and impacts of different attacks against the 802.15.4 GTS mechanism, a new GTS attacks simulation model for OMNeT++ is also introduced in this paper. Our GTS attacks model is developed for OMNeT++ / NETA, and is integrated with our GTS model to provide a single inclusive OMNeT++ simulation model for both the GTS mechanism and all known-to-date attacks against it.
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Pirumyan, Narine, and Mihran Stakyan. "Mathematical modeling of gas flow distribution process in the gas transportation system of Armenia." E3S Web of Conferences 281 (2021): 01006. http://dx.doi.org/10.1051/e3sconf/202128101006.

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The issues of enhancement the methods of calculation and design of the gas transportation system (GTS) in the Republic of Armenia and the Republic of Artsakh are considered, taking into account the analysis of loading modes and the peculiarities of the system individual nodes’ operation. To calculate the pressure distribution at the nodal points and gas flows, the matrix method for determining the material balance equations for the linear-independent and nonlinear-independent contours of the gas pipeline circuit is used as a process mathematical model. On the energy conservation law basis, the balance capacities equation of gas supply sources and its consumption, distributed among the gas transmission network elements, is proposed. A mathematical model of the gas distribution process is obtained. Calculation methods that allow increasing the economic efficiency of GTS operation under optimal terms of GTS development are proposed.
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Zhou, Ling, Yunjie Li, Yan Zhao, Chuanqi Ou, and Yue Zhao. "An accurate and efficient scheme involving unsteady friction for transient pipe flow." Journal of Hydroinformatics 23, no. 4 (June 7, 2021): 879–96. http://dx.doi.org/10.2166/hydro.2021.160.

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Abstract A robust prediction system should monitor all possible hydraulic transients, which is significant for the appropriate and safe operation of pipe systems. A second-order finite volume method (FVM) Godunov-type scheme (GTS) considering unsteady friction factors is introduced to simulate hydraulic transients, which was rarely involved in previous work. One explicit-solution source item approach developed in this work is crucial for the proposed GTS to easily incorporate various forms of the existing unsteady friction models, including original convolution-based models (Zielke model and Vardy–Brown model), simplified convolution-based model (Trikha–Vardy–Brown (TVB) model), and Brunone instantaneous acceleration-based model. Results achieved by the proposed models are compared with experimental data as well as predictions by the classic Method of Characteristics (MOC). Results show that the MOC scheme may produce severe numerical attenuation in the case of a low Courant number. The proposed second-order GTS unsteady friction models are accurate, efficient, and stable even for Courant numbers less than one and sparse grid, and only need much less grid number and computation time to reach the same numerical accuracy. The TVB convolution-based model and Brunone model in the second-order GTS are suggested for further applications in hydraulic transients due to their high accuracy and efficiency.
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Shiu, Chein-Jung, Yi-Chi Wang, Huang-Hsiung Hsu, Wei-Ting Chen, Hua-Lu Pan, Ruiyu Sun, Yi-Hsuan Chen, and Cheng-An Chen. "GTS v1.0: a macrophysics scheme for climate models based on a probability density function." Geoscientific Model Development 14, no. 1 (January 12, 2021): 177–204. http://dx.doi.org/10.5194/gmd-14-177-2021.

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Abstract. Cloud macrophysics schemes are unique parameterizations for general circulation models. We propose an approach based on a probability density function (PDF) that utilizes cloud condensates and saturation ratios to replace the assumption of critical relative humidity (RH). We test this approach, called the Global Forecast System (GFS) – Taiwan Earth System Model (TaiESM) – Sundqvist (GTS) scheme, using the macrophysics scheme within the Community Atmosphere Model version 5.3 (CAM5.3) framework. Via single-column model results, the new approach simulates the cloud fraction (CF)–RH distributions closer to those of the observations when compared to those of the default CAM5.3 scheme. We also validate the impact of the GTS scheme on global climate simulations with satellite observations. The simulated CF is comparable to CloudSat/Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data. Comparisons of the vertical distributions of CF and cloud water content (CWC), as functions of large-scale dynamic and thermodynamic parameters, with the CloudSat/CALIPSO data suggest that the GTS scheme can closely simulate observations. This is particularly noticeable for thermodynamic parameters, such as RH, upper-tropospheric temperature, and total precipitable water, implying that our scheme can simulate variation in CF associated with RH more reliably than the default scheme. Changes in CF and CWC would affect climatic fields and large-scale circulation via cloud–radiation interaction. Both climatological means and annual cycles of many of the GTS-simulated variables are improved compared with the default scheme, particularly with respect to water vapor and RH fields. Different PDF shapes in the GTS scheme also significantly affect global simulations.
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Zhong, Shao Bo, and Zhong Shi He. "The Scheduling Algorithm of Grid Task Based on PSO and Cloud Model." Key Engineering Materials 439-440 (June 2010): 1487–92. http://dx.doi.org/10.4028/www.scientific.net/kem.439-440.1487.

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Grid task scheduling (GTS) is a NP-hard problem. This paper proposes an optimized GTS algorithm which combines with the advantages of cloud model based on the particle swarm optimization algorithm. This algorithm iterates tasks utilizing the advantages of particle swarm optimization algorithm and then gets a set of candidate solutions quickly. In addition, this algorithm modifies the value of entropy and excess entropy using the characteristics of cloud model and implements the transformation between qualitative variables and quantity of uncertain events. And this algorithm makes particles fly to the global optimal solutions by exact searching in local areas. Theoretical analysis and simulation results show that this algorithm makes load balance of resource efficiently. It also avoids the problems of genetic algorithm and basic particle swarm optimization algorithm, which would easily fall into local optimal solutions and premature convergence caused by too much selected pressure. This algorithm has the advantages of high precision and faster convergence and can be applied in task scheduling on computing grid.
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Tong, Barry, Hala Borno, Eric Jay Small, Fern Alagala, Amie Blanco, and Mallika Sachdev Dhawan. "Streamlining the genetics pipeline to increase testing for patients at risk for hereditary prostate cancer." Journal of Clinical Oncology 38, no. 15_suppl (May 20, 2020): 1590. http://dx.doi.org/10.1200/jco.2020.38.15_suppl.1590.

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1590 Background: Metastatic prostate Cancer (mPCa) is increasingly recognized as a heritable disease and germline genetic testing has increasingly become a part of standard of care. At the University of California at San Francisco (UCSF) Genitourinary (GU) Medical Oncology clinic, approximately 850 new patients with mPCa are seen annually. A feasibility pilot Genetic Testing Station (GTS) was developed to expand access to genetic testing among this high-risk population. GTS is facilitated by Genetic Counselor Assistants (GCA) under the supervision of genetic counselors. Methods: This is a feasibility pilot of a GTS model among patients with mPCa. In this model, all patients with mPCa are offered a same day GTS visit with a GCA. At the GTS, the patient receives pre-test education via videos developed by genetic counselors. The patient provides informed consent, a family history, and a saliva sample for Invitae’s 87-gene panel. All positive results trigger a genetic counselor visit while non-positive results either receive a letter or a genetic counselor visit (in person or via telehealth). To evaluate the model, testing frequency and laboratory turnaround time (TAT) was assessed before and after the pilot. Results: In the first four months of the GTS pilot (10/14/2019 – 02/10/2020), 94 patients were referred and received genetic testing. Eight germline positives were identified (BRCA2, CHEK2, HOXB13 MSH6, RECQL4). The average TAT was 8 days. 9.3% of patients were found to have pathogenic mutations through the prostate GTS which is comparable to previously published rates of germline mutations in metastatic prostate cancer patients. In a 4-month time frame the prior to the intervention (10/01/2018-1/31/2019), 26 genetic testing orders were placed. The average laboratory TAT in this prior process was 17 days. Rates of positive germline mutations in the prior model was 8.6%. Conclusions: The GTS is a feasible method to increase access to germline genetic testing among a high-risk population. It may reduce barriers to testing and facilitate real-time discussion of treatment and prevention strategies with patients and family members. As a result, we will continue to operate the GTS. This model provides a framework for scaling access for and cascade testing in other high-risk patient groups.
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Smith, Tegan, John Laurie, Lisa Hall, Robert Nicoll, Andrew Kelman, and James Ogg. "The times they are a-changin': Australian biozones, petroleum basins, and the international geologic time scale (GTS) 2012." APPEA Journal 54, no. 2 (2014): 473. http://dx.doi.org/10.1071/aj13046.

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The international Geologic Time Scale (GTS) continually evolves due to refinements in age dating and the addition of more defined stages. The GTS 2012 has replaced GTS 2004 as the global standard timescale, resulting in changes to the age and duration of most chronological stages. These revisions have implications for interpreted ages and durations of sedimentary rocks in Australian basins, with ramifications for petroleum systems modelling. Accurate stratigraphic ages are required to reliably model the burial history of a basin, hence kerogen maturation and hydrocarbon expulsion and migration. When the resolution of the time scale is increased, models that utilise updated ages will better reflect the true basin history. The international GTS is largely built around northern hemisphere datasets. At APPEA 2009, Laurie et al. announced a program to tie Australian biozones to GTS 2004. Now, with the implementation of GTS 2012, these ties are being updated and refined, requiring a comprehensive review of the correlations between Australian and International biozonation schemes. The use of Geoscience Australia’s Timescales Database and a customised ‘Australian Datapack’ for the visualisation software package TimeScale Creator has greatly facilitated the transition from GTS 2004 to GTS 2012, as anticipated in the design of the program in 2009. Geoscience Australia’s basin biozonation and stratigraphy charts (e.g. Northern Carnarvon and Browse basins) are being reproduced to reflect the GTS 2012 and modified stratigraphic ages. Additionally, new charts are being added to the series, including a set of onshore basin charts, such as the Georgina and Canning basins.
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Tong, Barry, Hala Borno, Fern Alagala, Kelly Gordon, Eric Jay Small, Amy M. Lin, Amie Blanco, and Mallika Sachdev Dhawan. "Streamlining the genetics pipeline to increase testing for patients at risk for hereditary prostate cancer." Journal of Clinical Oncology 39, no. 6_suppl (February 20, 2021): 66. http://dx.doi.org/10.1200/jco.2021.39.6_suppl.66.

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66 Background: At UCSF, ~850 men with metastatic prostate cancer are seen annually, all of whom should receive germline genetic testing. Prior to our study, the GU medical oncology program offered a self-pay, take-home genetic testing kit (30-gene panel) to patients with metastatic prostate cancer. Patients with positive test results were referred for genetic counseling. For this study, the UCSF Cancer Genetics and Prevention program partnered with the GU medical oncology program, adapting a Genetic Testing Station (GTS) to expand access and accommodate testing needs. At Prostate GTS, a genetic counselor assistant (GCA) facilitates cancer genetics education by video, enrolls patient in a research registry, collects a family history and saliva sample sent for an 87-gene panel. Our study evaluates the effectiveness of the GTS by comparing prospective performance metrics and testing outcomes of Prostate GTS with retrospective data obtained from the take-home method (“Before GTS”). Methods: Men were ascertained by their treating oncologist and referred for GTS. Indications for genetic testing include: all metastatic prostate cancer, or under age 50 at diagnosis, or with family history, or at clinician discretion. GTS metrics were prospectively collected by clinical staff. “Before GTS” metrics were retrospectively collected through data reporting from commercial lab analysis (test orders dated 01/2017 to 09/2019) and patient chart review. Results: In the first 6 months of Prostate GTS (10/2019-3/2020), 139 patients received testing at the GTS and 91% (127) had received results at censoring. GTS results were distributed as follows: 10% (13) positives, 33% (42) negative no VUS, and 57% (72) negative w/VUS. In the 33 months, “Before GTS”, 218 genetic testing orders had been placed, with 78% (196) reported at censoring, distributed as 11% (22) positive, 68% (134) negative no VUS, and 20% (40) negative w/VUS. The rate of incomplete tests decreased significantly with the GTS, (22% down to 9%, p = 0.0008). "Before GTS", of patients with a positive result, 15/22 (68%) were referred for genetic counseling, of which 8 completed a visit (36% of all positives). In the GTS model, all patients with positive results were seen by a genetic counselor for results disclosure and counseling. Comparing result rates across similar timeframes, 127 results were reported from GTS compared to 40 results from “Before GTS” in the same calendar months the year prior, representing a 218% increase in returned results. Median turnaround time decreased from 16 days to 9 days with GTS. Conclusions: GTS efficiently increased access to genetic testing and counseling for patients with prostate cancer. By leveraging GCAs and video education, this model involves cancer genetics at each step of the process, decreases turnaround time, and increases rates of returned results that can be used by patients to inform treatment and prevention strategies.
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Veselý, Štěpán, and Mirko Dohnal. "Decision making in goverment tenders: A formalized qualitative model." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 60, no. 4 (2012): 397–406. http://dx.doi.org/10.11118/actaun201260040397.

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The paper presents a simple formalized qualitative model of government tenders (GTs). Qualitative models use just three values: Positive/Increasing, Zero/Constant and Negative/Decreasing. Such quantifiers of trends are the least information intensive. Qualitative models can be useful, since GT evaluation often includes such goals as e.g. efficiency of public purchasing, and variables as e.g. availability of relevant information or subjectivity of judgment, that are difficult to quantify. Hence, a significant fraction of available information about GTs is not of numerical nature, e.g.if availability of relevant information is decreasing then efficiency of public purchasing is decreasing as well. Such equationless relations are studied in this paper. A qualitative model of the function F(Goals, Variables) is developed. The model has four goal functions, eight variables, and 39 equationless relations. The model is solved and seven solutions, i.e. scenarios are obtained. All qualitative states, including first and second qualitative derivatives with respect to time, of all variables are specified for each scenario. Any unsteady state behavior of the GT model is described by its transitional oriented graph. There are eight possible transitions among seven scenarios. No a priori knowledge of qualitative modeling is required on the reader’s part.
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Moriarty, J., H. A. Ring, and M. M. Robertson. "An idiot savant calendrical calculator with Gilles de la Tourette syndrome: implications for an understanding of the savant syndrome." Psychological Medicine 23, no. 4 (November 1993): 1019–21. http://dx.doi.org/10.1017/s0033291700026477.

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SynopsisWe describe the existence of the savant syndrome in association with Gilles de la Tourette's Syndrome (GTS). The presentation of savant abilities is typical of that previously described. Similarities between autism, the disorder most characteristically associated with savants, and GTS in terms of obsessionality are noted. Previously reported psychological studies of autistic savants are briefly reviewed and, together with evidence from neuroimaging in GTS, obsessive compulsive disorder (OCD), and autism, used to support a model of the underpinnings of savant skills.
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Dissertations / Theses on the topic "GTS model"

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McIntosh, Cecilia A. "Structure and Function of Flavonoid Glucosyltransferases: Using a Specific Grapefruit Enzyme as a Model." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/etsu-works/355.

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Glucosyltransferases (GTs) are enzymes that enable transfer of glucose from an activated donor (UDP-glucose) to the acceptor substrates. A flavonol specific glucosyltransferase cloned from Citrus paradisi has strict substrate and regiospecificity (Cp3OGT). The amino acid sequence of Cp3OGT was aligned with a purported anthocyanin GT from Clitorea ternatea and a GT from Vitis vinifera that can glucosylate both flavonols and anthocyanidins. Using homology modeling to identify candidate regions followed by site directed mutagenesis, three double mutations of Cp3OGT were made. Biochemical analysis of the three mutant proteins was performed. S20G+T21S protein retained activity similar to the wildtype (WT- Kmapp-80 µM; Vmax = 16.5 pkat/µg, Mutant- Kmapp-83 µM; Vmax -11 pkat/µg) but the mutant was more thermostable compared to the WT and this mutation broadened its substrate acceptance to include the flavanone, naringenin. S290C+S319A mutant protein retained 40% activity relative to wildtype, had an optimum pH shift, but had no change in substrate specificity (Kmapp-18 µM; Vmax-0.5 pkat/µg). H154Y+Q87I protein was inactive with every class of flavonoid tested. Product identification revealed that the S20G+T21S mutant protein widened the substrate and regio-specificity of CP3OGT. Docking analysis revealed that H154 and Q87 could be involved in orienting the ligand molecules within the acceptor binding site. H363, S20, and S150 were also found to make close contact with the 7-OH, 4-OH and 3’-OH groups, respectively.
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McIntosh, Cecilia A. "Structure and Function of Flavonoid Glucosyltransferases: Using a specific Grapefruit Enzyme as a Model." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/369.

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Luo, Hongwei, and Hongwei luo@rmit edu au. "Modelling and simulation of large-scale complex networks." RMIT University. Mathematical and Geospatial Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080506.142224.

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Real-world large-scale complex networks such as the Internet, social networks and biological networks have increasingly attracted the interest of researchers from many areas. Accurate modelling of the statistical regularities of these large-scale networks is critical to understand their global evolving structures and local dynamical patterns. Traditionally, the Erdos and Renyi random graph model has helped the investigation of various homogeneous networks. During the past decade, a special computational methodology has emerged to study complex networks, the outcome of which is identified by two models: the Watts and Strogatz small-world model and the Barabasi-Albert scale-free model. At the core of the complex network modelling process is the extraction of characteristics of real-world networks. I have developed computer simulation algorithms for study of the properties of current theoretical models as well as for the measurement of two real-world complex networks, which lead to the isolation of three complex network modelling essentials. The main contribution of the thesis is the introduction and study of a new General Two-Stage growth model (GTS Model), which aims to describe and analyze many common-featured real-world complex networks. The tools we use to create the model and later perform many measurements on it consist of computer simulations, numerical analysis and mathematical derivations. In particular, two major cases of this GTS model have been studied. One is named the U-P model, which employs a new functional form of the network growth rule: a linear combination of preferential attachment and uniform attachment. The degree distribution of the model is first studied by computer simulation, while the exact solution is also obtained analytically. Two other important properties of complex networks: the characteristic path length and the clustering coefficient are also extensively investigated, obtaining either analytically derived solutions or numerical results by computer simulations. Furthermore, I demonstrate that the hub-hub interaction behaves in effect as the link between a network's topology and resilience property. The other is called the Hybrid model, which incorporates two stages of growth and studies the transition behaviour between the Erdos and Renyi random graph model and the Barabasi-Albert scale-free model. The Hybrid model is measured by extensive numerical simulations focusing on its degree distribution, characteristic path length and clustering coefficient. Although either of the two cases serves as a new approach to modelling real-world large-scale complex networks, perhaps more importantly, the general two-stage model provides a new theoretical framework for complex network modelling, which can be extended in many ways besides the two studied in this thesis.
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Bachman, William Hendricks. "Towards a GIS-based modal model of automobile exhaust emissions." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/21762.

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Santos, Pedro Miguel Matos dos. "Investment in new HUB for Oil & Gas Engineering Centres by Oil & Gas Services Companies." Master's thesis, Instituto Superior de Economia e Gestão, 2014. http://hdl.handle.net/10400.5/7882.

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Mestrado em Finanças
O renovado interesse na indústria petrolífera coloca-a no topo da lista de prioridades de investimento estrangeiro para alguns países. A competitividade empresarial é um factor bastante importante numa Sociedade global e, como tal, um factor que não pode ser descurado a este nível. O objectivo deste trabalho assenta no estudo de uma decisão de investimento referente à possível expansão da actividade de empresas prestadoras de serviços na indústria petrolífera. Além da definição do enunciado da situação, uma resolução é apresentada. Esta resolução assenta em três metodologias distintas: - Modelo Free Cash-Flow; - Análise Strengths, Weaknesses, Opportunities e Threats (SWOT); - Modelo Matriz Híbrida. O modelo de Free Cash-Flow permitiu considerar os custos de capital de cada empresa e chegar a uma conclusão sobre o país/local que apresenta as métricas financeiras mais apelativas. A análise SWOT oferece-nos uma visão mais generalista acerca dos países considerados sobre a perspectiva de investimento.. Com o intuito de analisar factores estratégicos induzidos por parâmetros externos (de forma a não considerar apenas métricas financeiras), foi criada uma Matriz Híbrida e foi realizada a respectiva análise. Neste seguimento, os resultados apresentados pelo Modelo de Matriz Híbrida deverão ser considerados aquando da decisão de expansão. Foi possível concluir que a melhor opção base é a criação de um escritório em Portugal. Apesar desta conclusão, a solução óptima é observada quando contabilizamos os custos de abrir um escritório em Portugal e quando, simultaneamente, consideramos os impostos que são pagos na Holanda (devido à sua política de impostos mais atractiva).
The renewed interest in the Oil & Gas sector places this Industry at the top of the list of priorities for some countries in order to attract foreign investment. Corporate competitiveness is, therefore, an extremely important vehicle for a globalized Society. The aim of the present work was to study the possible investment contemplated by an expansion decision taken by some Oil & Gas Services companies. Besides the definition of the problem, an adequate resolution is also presented. This resolution is sustained by three distinct methodologies: - Free Cash-Flow Model; - Strengths, Weaknesses, Opportunities and Threats (SWOT) analysis; - Hybrid Matrix Model. The Free Cash-Flow Model enabled us to consider costs of capital and come to a decision regarding the country that presented the best financial results. The SWOT analysis provided a more generalist view over the several analysed countries. With the purpose of analysing strategic factors induced by external parameters (besides the financial field), the Hybrid Matrix Model was created and a study was carried out. Subsequently, the results presented by the Hybrid Matrix Model shall be taken into account when choosing a location for an international expansion. It was possible to conclude that the best base scenario is observed when opening an Office in Portugal. However, the optimal solution would be opening an Office in Portugal and account the profits/losses in the Netherlands, mixing the country that presents the lowest costs with the country that has the best taxation policies.
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HURD, JOHN K. JR. "A GIS MODEL TO ESTIMATE SNOW DEPTH USING DIFFERENTIAL GPS AND HIGH-RESOLUTION DIGITAL ELEVATION DATA." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1177640172.

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Veronez, Maurício Roberto. "Proposta de um modelo regional para a redução do efeito sistemático da ionosfera através do método seqüencial de ajustamento." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-28092015-095816/.

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O posicionamento de pontos, com o sistema GPS, tornou-se uma ferramenta importante, aplicável nas mais diferentes áreas do conhecimento. No entanto, em algumas situações, a exigência de elevadas precisões trouxe a inconveniência de um custo elevado na aquisição de receptores de dupla freqüência. Mesmo com os avanços tecnológicos, a ionosfera é uma das fontes de erro que mais afetam o posicionamento de pontos. Para os usuários que possuem equipamentos de dupla freqüência, este erro é modelado com grande eficiência através do processamento de dados com solução iono free. No Brasil, a maioria dos usuários possui equipamentos que captam informações apenas do código C/A e/ou código C/A e portadora L1. Neste caso faz-se uso de alguns modelos, como, por exemplo, o de Klobuchar, com redução do erro nos posicionamentos absolutos de, aproximadamente, 50%. Nos posicionamentos relativos, com bases superiores a 20 Km, a utilização deste modelo não é a mais indicada. Neste contexto, este trabalho consiste no desenvolvimento de um método que possibilite modelar o atraso ionosférico através de um polinômio do segundo grau, baseado no ajustamento seqüencial de observações. As informações necessárias para esta modelagem são advindas das estações GPS da Rede Brasileira de Monitoramento Contínuo. Isto possibilita, em posicionamentos absolutos, determinar o atraso ionosférico de uma forma mais eficiente que o obtido pelo modelo de Klobuchar. Em posicionamentos relativos, para os usuários de equipamentos de simples freqüência, tal modelagem permite a geração de um código com características semelhantes ao código P2. Assim, com os dados gerados por receptores de uma freqüência, é possível processar vetores de bases longas por meio da solução iono free code. Os resultados obtidos indicam que tal metodologia pode ser uma alternativa eficiente para minimizar o efeito ionosférico no posicionamento de pontos com o sistema GPS. Horizontalmente, através dos métodos de posicionamento Single Point e relativo, respectivamente, o modelo ionosférico proposto proporcionou uma melhoria de 39% e 26% se comparado com o modelo de Klobuchar.
Point positioning, with GPS, became an important tool applicable to the most different areas of the knowledge. However, in some situations, the requirement of high precisions brought the inconvenience of a high cost in the acquisition of dual receivers frequency. Despite of the technological advances, the ionosphere is one of the error sources that affect most point positioning. For users who have dual equipment frequency, this error is modeled with great efficiency through data processing with the ionosphere free solution. In Brazil the majority of the users has equipments that process C/A code information only and/or C/A code and L1 carrier. In this case it is necessary to use some models, for example the Klobuchar model, with error reduction of approximately 50% in absolute point positioning. In the relative positioning, with baselines longer than 20 Km, the use of this model is not indicated. Thus, this work consists in developing a method that makes possible to model the ionospheric delay using a second degree polynomial, based on sequential adjustment of observations. The necessary information for this modeling is obtained from GPS stations that compose the RBMC (Brazilian Network for Continuous Monitoring of GPS). Thus it is possible to determine the ionospheric delay in a more efficient way in absolute positioning than when using the Klobuchar model. In relative positioning, for single frequency users, such modeling allows the generation of a code, with similar characteristics to the P2 code. Hence, with data generated by single frequencies, it is possible to process long base line vectors, using the iono free code solution. The results obtained indicate that such methodology can be an efficient alternative to minimize the ionospheric effect in the GPS point positioning. Horizontally, through the methods of positioning Single Point and relative, respectively, the ionospheric model considered provided an improvement of 39% and 26% if compared with the Klobuchar model.
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Clark, Alexandra Lynn, and Alexandra Lynn Clark. "A groundwater flow model of Indian Wells Valley, California, Utilizing GMS with GIS applications." Thesis, The University of Arizona, 1999. http://hdl.handle.net/10150/626875.

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The sustainability of a potable groundwater supply in the regional aquifer of Indian Wells Valley, California, is threatened by overdraft and by induction of contaminated upper aquifer waters into the lower, regional aquifer. A three layer MODFLOW groundwater model is developed in GMS (Groundwater Modeling System) to enhance understanding of the hydro logic flow regime and to serve as a groundwater management tool. The steady-state model is calibrated with water level measurements collected during 1920 and 1921. Water level data spanning several decades are used in transient model calibration. Calibration is by trial and error adjustment of the transmissivity with subsequent recharge refinement. Model simulated heads agree with observed heads in most regions within ten feet, except for the southwest, which may require additional field investigation. The model suggests that less than 5000 acre feet/year of recharge may supply the valley, compared with previous model estimates of 9840 acre-feet/year.
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Bandreddy, Naga Abhiram. "Defining Correlation Between Radon, Uranium Deposits, and Oil and Gas Wells Using GIS Regression Methods." University of Toledo / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1564687565423414.

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Yongqian, Wang, Li Xianliang, and Zhang Qishan. "A Vehicle Tracking System Based on GPS." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/611591.

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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada
Vehicle tracking system based on GPS has been paid more and more attention. The system consists of GIS (Geological Information System), master station, movable station and communication network. Movable stations installed on automobiles transmit their position and status messages to the master station. All vehicles' tracks are drawn on the electrical map displayed by the master station's computer screen in real time. Vehicles' alarming signals can also be transmitted to the master station simultaneously. This paper presents a whole designing scheme of the vehicle tracking system, then it makes a thorough introduction to the system's performance and working procedure. The key technologies employed by the system and the relations between them are also discussed in details in the paper.
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Books on the topic "GTS model"

1

Krichene, Noureddine. An oil and gas model. [Washington, D.C.]: International Monetary Fund, African Dept., 2007.

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Spindizzies, gas-powered model racers. San Francisco, Calif: E-Z Spindizzy Collection, 1998.

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Srinivasan, Shankari. Gazprom's new upstream--downstream model. Cambridge, MA: CERA, 2007.

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Barns, D. W. Use of the Edmonds-Reilly model to model energy-related greenhouse gas emissions. Paris: Organisation for Economic Co-opertion and Development, 1992.

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Organisation for Economic Co-operation and Development. Dept. of Economics and Statistics. Use of the Edmonds-Reilly model to model energy-related greenhouse gas emissions. Paris: Organisation for Economic Co-operation and Development, 1992.

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Barns, D. W. Use of the Edmonds-Reilly model to model energy-related greenhouse gas emissions. Paris: OECD, 1992.

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Barns, David W. Use of the Edmonds-Reilly model to model energy-related greenhouse gas emissions. Paris: Organisation for Economic Co-operation and Development, 1992.

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Sudhoff, F. A. Shawnee flue gas desulfurization computer model users manual. Research Triangle Park, NC: U.S. Environmental Protection Agency, Industrial Environmental Research Laboratory, 1985.

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Stoppard, Michael. The new gas purchasing model: Exploring international partnerships. Cambridge, MA: CERA, 2008.

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Paxson, Daniel E. A general numerical model for wave rotor analysis. [Washington, DC: National Aeronautics and Space Administration, 1992.

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Book chapters on the topic "GTS model"

1

Mao, Rubai, Zhe Han, Zitu Liu, Yong Liu, Xingfeng Lv, and Ping Xuan. "PRME-GTS: A New Successive POI Recommendation Model with Temporal and Social Influences." In Advanced Data Mining and Applications, 266–74. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-35231-8_19.

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Shekhar, Shashi, and Hui Xiong. "Conceptual Model." In Encyclopedia of GIS, 123. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_170.

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Shekhar, Shashi, and Hui Xiong. "Process Model." In Encyclopedia of GIS, 913. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_1031.

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Shekhar, Shashi, and Hui Xiong. "Camera Model." In Encyclopedia of GIS, 70. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_114.

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Shekhar, Shashi, and Hui Xiong. "Object Model." In Encyclopedia of GIS, 793. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_890.

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Shekhar, Shashi, and Hui Xiong. "Parametric Model." In Encyclopedia of GIS, 843. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_951.

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Shekhar, Shashi, and Hui Xiong. "Model Generalization." In Encyclopedia of GIS, 682. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_804.

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Shekhar, Shashi, and Hui Xiong. "Digital Elevation Model." In Encyclopedia of GIS, 240. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_288.

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Shekhar, Shashi, and Hui Xiong. "Digital Surface Model." In Encyclopedia of GIS, 240. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_294.

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Shekhar, Shashi, and Hui Xiong. "Document Object Model." In Encyclopedia of GIS, 254. Boston, MA: Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-35973-1_323.

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Conference papers on the topic "GTS model"

1

Sitlani, Manish P., and Kendrick Aung. "Numerical Simulations on Aerodynamic Drag of Ground Transportation System (GTS) Model." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16368.

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The aerodynamic drag characteristics of a heavy-duty truck with two configurations, a tractor and a single trailer, and a tractor and a tandem-trailer (two trailers), have been studied. The aerodynamic drag of a truck depends on geometry, frontal area and shape, and the speed of the truck. The basic geometry used in the simulation is a 1:8 scale Ground Transportation System (GTS). The effects of vehicle geometry, frontal shape, vehicle speed, and the gap size were investigated and the drag coefficients were computed. The effect of add-on devices such as aerodynamic boat-tail plates at the rear of the trailer on the aerodynamic drag of the truck has also been analyzed. In particular, the effects of the gap between tractor and trailer, and the gap between trailers on the aerodynamic drag of tractor and two trailers configuration were determined. The feasibility of Reynolds-Average Navier-Stokes (RANS) κ-ε model in the prediction of aerodynamic drag at various Reynolds numbers has also been studied. The CFD software from CD-adapco together with an expert tool, es-aero, was used for all the analyses reported in this paper. CFD simulations for tractor and single trailer configuration were performed for various Reynolds numbers. The simulation results were validated with available experimental data and good agreements were found. Validation of numerical results for tractor and single trailer with the experimental data formed the basis for analyzing tractor and double trailer configuration. The tractor and two trailers configuration for different gap sizes between the trailers at various speeds were analyzed. The results showed that closing the gaps and incorporating boat-tails at the rear of the trailer could reduce the drag by as much as 33 percent. Drag coefficient also reduced by 46 percent by introducing smooth frontal fillets in case of tractor and single trailer. The study also emphasizes flow structures around the vehicle that contribute to the total drag.
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Zhang, Baoliang, Dahua Li, and Xianfeng Shao. "Mountain Area Based on MIDAS/GTS Model Earthwork Excavation Slope Stability Analysis." In 2017 2nd International Conference on Advances in Materials, Mechatronics and Civil Engineering (ICAMMCE 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icammce-17.2017.28.

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Shrestha, Bharat, Ekram Hossain, and Sergio Camorlinga. "A Markov model for IEEE 802.15.4 MAC with GTS transmissions and heterogeneous traffic in non-saturation mode." In 2010 IEEE International Conference on Communication Systems (ICCS). IEEE, 2010. http://dx.doi.org/10.1109/iccs.2010.5685906.

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Jinyong, Yao, Zhen Jiangyun, and Sheng Tao. "Based on GTS Formal Model Research on Reliability Test Profile Method of Hardsoftware System." In Proceedings of the 29th European Safety and Reliability Conference (ESREL). Singapore: Research Publishing Services, 2019. http://dx.doi.org/10.3850/978-981-11-2724-3_0866-cd.

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Jurcik, P., A. Koubaa, M. Alves, E. Tovar, and Z. Hanzálek. "A Simulation Model for the IEEE 802.15.4 protocol: Delay/Throughput Evaluation of the GTS Mechanism." In 2007 15th International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems. IEEE, 2007. http://dx.doi.org/10.1109/mascots.2007.4.

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Palme´, Thomas, Peter Breuhaus, Mohsen Assadi, Albert Klein, and Minkyo Kim. "New Alstom Monitoring Tools Leveraging Artificial Neural Network Technologies." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45990.

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This study presents a methodology to improve monitoring of gas turbines (GTs) while not having the specific engine characteristics available by applying a nonparametric statistical modeling based on operational data. The goal is to quantify the relationship between the operational conditions and the GT performance parameters during normal operation. In this study, the Multi-Layer Perceptron (MLP) Neural Network (NN) model is used to develop so called baseline models of the GTs. To verify the generic applicability, two different GTs and several units for each GT type are evaluated. A methodology to both, selecting the appropriate models with regard to input and output parameters as well as validating the selection of the parameters is reported. The key result can be summarized as: MLPs can be used for statistical modeling of GTs with very high accuracy, which permits an accurate prediction of the performance parameters during different operational conditions. It is also shown that under certain conditions, a developed NN model can be transferred to a similar GT. In summary, this study shows that NN can be used to improve on-line monitoring of a GT, making it possible to detect trends in the measured data indicating a change in the health status of the engine, requiring operational data only for model development.
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Branchini, L., and H. Perez-Blanco. "Handling Wind Variability Using Gas Turbines." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68045.

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A significant amount of energy is expected to come from wind in the upcoming years. The variability and uncertainty of this power source needs to be managed by the grid operator. Electricity networks with wind energy need extra reserves to deal with the extra uncertainty associated with the presence of wind. This paper evaluates the possibility to couple a 1000 MW wind farm with gas turbines (GTs) to provide firm capacity to the grid with a reasonable investment. Taking into account two different days of wind production with one minute data, the study analyzes the possibility of integrating the wind power output with two different types of GTs (heavy duty and aeroderivative). GTs operational constrains are included in the model in order to correctly demonstrate how the wind variability stresses turbine performance, as it probably would in extreme cases. Limitations on GTs ramps rates and start–up time are considered for both, heavy duty and aeroderivatives. GTs power output profiles, ramp rates and fuel consumption for the selected days of analysis are shown. The results show that the integration between wind and gas turbines could be a viable solution to compensate wind variability and to accommodate the increasing wind penetration into the electrical grid.
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Li, Zhen, Lifeng Zhao, Bo Wang, Jinling Chi, Shijie Zhang, and Yunhan Xiao. "A Thermodynamic Evaluation of GTCC/IGCC Based on a Quasi-One-Dimensional Turbine Cooling Model." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26534.

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Developing an advanced gas turbine (GT) can have a significant impact on the thermodynamic performance of the GT combined cycle (GTCC) and the integrated gasification combined cycle (IGCC). Owing to the importance of system evaluation, it is essential to find ways to accurately predict the performance of state-of-the-art GTs through an accurate and reliable turbine cooling model. Thus, a quasi-one-dimensional (quasi-1D) turbine cooling model, which considers the film cooling and thermal barrier coating (TBC), is established and verified in this work. The model parameters, ηc,∞, ηt,∞, Z, rfc, Bitbc and Tbmx, which represent compressor and turbine efficiencies, convective cooling technology level, film cooling coefficient, Biot number of TBC and allowed maximal temperature of turbine blade, respectively, are confirmed. Reference is made to current advanced GTs during the modeling process. More importantly, the impacts of combustor exit temperature (Tcot), pressure ratio (PR), and cooling approaches on the thermodynamic performance of GTCC are all evaluated based on the quasi-1D turbine cooling model. Results show that the GTCC net efficiency does not always increase along with the increase of Tcot, under the premise of maintaining the cooling technology. The optimal PR, when the GTCC efficiency peaks, exists at each Tcot. In addition, the net efficiency of GTCC, which adopts a closed-loop steam cooling, is improved by about 2 to 3 percentage points compared with that of the conventional open-loop air cooling approach. Furthermore, the IGCC thermodynamic performance potential is greatly affected by GTCC. It is estimated that the net efficiency of IGCC integrated with 1700 °C-class GT has a total improvement of about 6 percentage points relative to that of IGCC integrated with a GE PG9351FA GT.
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Maggiani, Gianluca, Matthew J. Roy, Simone Colantoni, and Philip J. Withers. "Improved Life Assessment for Ni-Based Gas Turbine First Stage High Pressure Turbine Nozzles." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14763.

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Abstract Industrial gas turbines (GTs) have advanced and numerous changes in both use, materials employed and design boundaries have occurred. The constraints aimed at lowering NOx emissions for improving the footprint, have driven designers to increase the firing temperatures and to look for improved cooling systems of GTs nozzles. These factors led to more severe operating conditions for hot gas path components and to the need for more accurate and comprehensive thermo-mechanical models for life assessment purposes. Within this context, a Lemaitre-Chaboche viscoplastic model has been coupled with a modified θ-projection creep model for MAR-M-247 material to account for steady-state creep effects in a finite element transient analysis (FEA). These material models have been applied on a cooled, first stage nozzle for a recently developed high-efficiency gas turbine. A verification assessment has been performed on a overfired, off-design transient analysis. The viscoplastic model developed showed the capability of predicting an accurate initiation zone of cracking. The FEA employing the captured inelastic behaviour predicted a high stress state in the location where an experimental crack nucleated. Furthermore, the model demonstrates the capability of using the Lemaitre-Chaboche plastic model coupled with the θ-projection creep model to predict reasonable inelastic strains for the entire lifetime of a gas turbine.
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Sitlani, M., and K. Aung. "Numerical Simulations on the Aerodynamics Drag of a Tractor With a Tandem-Trailer." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98396.

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The aerodynamic drag characteristics of a heavy duty truck with two configurations, a tractor and a single trailer, and a tractor and a tandem-trailer (two trailers), have been studied. The aerodynamic drag of a truck depends on geometry, frontal area, and the speed of the truck. The basic geometry used in the simulation is 1:8 scale Ground Transportation System (GTS). The present simulation model has a simplified geometry of GTS with a cab-over engine design with either one or two trailers. In particular, the effects of the gap between the tractor and the trailer, and the gap between the tandem trailers on the aerodynamic drag were determined. The effects of vehicle geometry, vehicle speed, and the gap size were investigated and the drag coefficients were computed. CFD software STAR-CD with an expert tool, es-aero, was used for all the analyses reported in this paper. The simulation results were validated with available experimental data and good agreements were found for vehicle speeds at highway and city limits. The results showed that closing the gaps and incorporating boat-tails at the rear of the trailer could reduce the drag by as much as 40 percent.
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Reports on the topic "GTS model"

1

Veronica J. Rutledge. Adsorption Model for Off-Gas Separation. Office of Scientific and Technical Information (OSTI), March 2011. http://dx.doi.org/10.2172/1017866.

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Ruosteenoja, Kimmo. Applicability of CMIP6 models for building climate projections for northern Europe. Finnish Meteorological Institute, September 2021. http://dx.doi.org/10.35614/isbn.9789523361416.

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In this report, we have evaluated the performance of nearly 40 global climate models (GCMs) participating in Phase 6 of the Coupled Model Intercomparison Project (CMIP6). The focus is on the northern European area, but the ability to simulate southern European and global climate is discussed as well. Model evaluation was started with a technical control; completely unrealistic values in the GCM output files were identified by seeking the absolute minimum and maximum values. In this stage, one GCM was rejected totally, and furthermore individual output files from two other GCMs. In evaluating the remaining GCMs, the primary tool was the Model Climate Performance Index (MCPI) that combines RMS errors calculated for the different climate variables into one index. The index takes into account both the seasonal and spatial variations in climatological means. Here, MCPI was calculated for the period 1981—2010 by comparing GCM output with the ERA-Interim reanalyses. Climate variables explored in the evaluation were the surface air temperature, precipitation, sea level air pressure and incoming solar radiation at the surface. Besides MCPI, we studied RMS errors in the seasonal course of the spatial means by examining each climate variable separately. Furthermore, the evaluation procedure considered model performance in simulating past trends in the global-mean temperature, the compatibility of future responses to different greenhouse-gas scenarios and the number of available scenario runs. Daily minimum and maximum temperatures were likewise explored in a qualitative sense, but owing to the non-existence of data from multiple GCMs, these variables were not incorporated in the quantitative validation. Four of the 37 GCMs that had passed the initial technical check were regarded as wholly unusable for scenario calculations: in two GCMs the responses to the different greenhouse gas scenarios were contradictory and in two other GCMs data were missing from one of the four key climate variables. Moreover, to reduce inter-GCM dependencies, no more than two variants of any individual GCM were included; this led to an abandonment of one GCM. The remaining 32 GCMs were divided into three quality classes according to the assessed performance. The users of model data can utilize this grading to select a subset of GCMs to be used in elaborating climate projections for Finland or adjacent areas. Annual-mean temperature and precipitation projections for Finland proved to be nearly identical regardless of whether they were derived from the entire ensemble or by ignoring models that had obtained the lowest scores. Solar radiation projections were somewhat more sensitive.
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Gault, K. A., R. S. Lillo, D. J. Temple, and P. K. Weathersby. Multispecies Decompression Model Using Asymmetrical Gas Kinetics. Fort Belvoir, VA: Defense Technical Information Center, January 2003. http://dx.doi.org/10.21236/ada444048.

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Lyon, Kevin L., Amy K. Welty, Jack Law, Austin Ladshaw, Sotira Yiacoumi, and Costas Tsouris. Off-Gas Adsorption Model Capabilities and Recommendations. Office of Scientific and Technical Information (OSTI), March 2016. http://dx.doi.org/10.2172/1260462.

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Veronica J. Rutledge. Dynamic Absorption Model for Off-Gas Separation. Office of Scientific and Technical Information (OSTI), July 2011. http://dx.doi.org/10.2172/1027923.

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Saltus, Christina, Todd Swannack, and S. McKay. Geospatial Suitability Indices Toolbox (GSI Toolbox). Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41881.

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Habitat suitability models are widely adopted in ecosystem management and restoration, where these index models are used to assess environmental impacts and benefits based on the quantity and quality of a given habitat. Many spatially distributed ecological processes require application of suitability models within a geographic information system (GIS). Here, we present a geospatial toolbox for assessing habitat suitability. The Geospatial Suitability Indices (GSI) toolbox was developed in ArcGIS Pro 2.7 using the Python® 3.7 programming language and is available for use on the local desktop in the Windows 10 environment. Two main tools comprise the GSI toolbox. First, the Suitability Index Calculator tool uses thematic or continuous geospatial raster layers to calculate parameter suitability indices based on user-specified habitat relationships. Second, the Overall Suitability Index Calculator combines multiple parameter suitability indices into one overarching index using one or more options, including: arithmetic mean, weighted arithmetic mean, geometric mean, and minimum limiting factor. The resultant output is a raster layer representing habitat suitability values from 0.0 to 1.0, where zero is unsuitable habitat and one is ideal suitability. This report documents the model purpose and development as well as provides a user’s guide for the GSI toolbox.
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Yafimava, Katja. The EU Third Package for Gas and the Gas Target Model. Oxford Institute for Energy Studies, April 2013. http://dx.doi.org/10.26889/9781907555718.

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Barns, D. W., J. A. Edmonds, and J. M. Reillyn. Use of the Edmonds-Reilly Model to model energy-related greenhouse gas emissions. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/5535767.

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Barns, D. W., J. A. Edmonds, and J. M. Reillyn. Use of the Edmonds-Reilly Model to model energy-related greenhouse gas emissions. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/10131971.

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Jerrell, J. W. Revisions to the hydrogen gas generation computer model. Office of Scientific and Technical Information (OSTI), August 1992. http://dx.doi.org/10.2172/10156465.

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