51 research outputs found
Appendix: Glish Syntax and Grammar
No full textthis paper. For the curious, the Glish language was named by the second author so that when upper management types ask, "What language is this stuff written in?" we can reply, "In Glish, of course!" Reference
Characteristics of Offshore Wind Farm Wakes and their Impact on Wind Power Production from Long-term Modelling and Measurements
No full textAs the penetration of offshore wind farms continues to increase in Western Europe, the North Sea in particular is becoming more densely populated by offshore wind farms. Wind turbine wakes have been a topic of great research in the field of wind energy for some time, however the industry now seeks an understanding of the in- fluence of the wake from one wind farm on the performance of a downstream wind farm. Few studies have been conducted to this end. This project will contribute to the greater work of the DTU OffshoreWake project. This master thesis will use 2018 SCADA data provided by the project partner, Vattenfall, meteorological mast data provided by BMWi and PTJ, and the author will conduct and analyse simulations using the Weather Research and Forecasting (WRF) model for the same time period. Additionally, this project will comment on the validity of the wind farm param- eterization sub-models within WRF, and investigate the dependance of wakes on climatological variables and offer a longer term study than previously conducted, therefore giving the possibility of conclusions with greater certainty based on this body of work. It is found that both of the wind farm parameterization schemes (Fitch and EWP) used in this project can reasonable replicate the trends seen in the measured data. The EWP scheme tends to over-predict both gross power produc- tion and mean wind speed, while the Fitch scheme tends to underpredict the same. However, for both schemes, good agreement is found with measurements when the wind speed is accurately predicted. Wind farm wakes are observed in SCADA data and WRF simulations. The magnitude of velocity deficit tends to increase for sea- sons in which atmospherically stable conditions are most frequent. In the region of study, these stable conditions are accompanied by generally lower wind speeds and winds which prevail from the east.DTU Wind Energy-M-0315OffshoreWakeAerospace Engineering | Aerodynamics and Wind Energ
[[alternative]]The study on the component analysis of number series completion test
No full text[[abstract]]The purposes of this study were to decompose the difficulty level of number se
ries completion task, and to examine if the constructs for detecting regular n
umber series and irregular number series are different. Two studies were condu
cted, studyⅠwith the pretest data of the math test in the Youth Intelligence
Test, and studyⅡwith the number series completion test developed by the autho
r. Both studies focused on the test component analysis and the component param
eter estimation that were calculated by using stepwise regression model and th
e Linear Logistic Latent Trait Model.The major findings of this study are as f
ollows:1. The constructs to solve both regular number series items and irregul
ar number series items are of the same dimension.1. In studyⅠ, the major diff
iculty accountability of number series completion task comes from three compon
ents: if the series is moving or not, period of the series, and if the series
is spurious identity or not. These three components significantly and positive
ly related to the difficulty level of number series completion task.3. In stud
yⅡ, the difficulty accountability of number series completion task comes from
four components: if the same figures of the series are adjacent or not, if th
e series is regular or not, if the number of the same figures equals to the pe
riod of the string or not, and if the series is spurious identity or not. The
first three components negatively related to difficulty level of number series
completion task, while the last component positively related to the difficult
y level of number series completion task.4. In several cases, the interaction
term among the components is able to account for the difficulty level of numbe
r series completion task.5. More components are needed to increase the account
ability of items' difficulty of number series completion task according to the
result, especially when the test size is getting large.6. The result shows th
at both stepwise regression and LLTM methods for estimation of component param
eter are similar.
Tracking the History of Romani Publications: Challenges Presented by Flawed Data
No full textThis is the preprint of the published version, identical except for the correction of one typo.Romani is a language of northern Indic origin spoken natively by an estimated 2.5 million people, primarily in Eurasia but also in North America. The history of publication patterns in Romani has not been well documented. Extracting data about this history based on available information in large bibliographic databases such as OCLC WorldCat has been hampered by unfortunate misap- plication of certain language codes, making it all but impossible to filter search results efficiently using Romani language as a param- eter. The author discusses how he was able to correct much of this inaccurate data in OCLC WorldCat
A metric and mixed-integerprogramming-based approach for resource allocation in dynamic real-time systems
No full textDynamic real-time systems such as embedded sys-tems operate in environments in which several param-eters vary at run time. These systems must satisfy several performance requirements. Resource allocation on these systems becomes challenging because varia-tions of run-time parameters may cause violations of the performance requirements. Performance violations result in the need for dynamic re-allocation, which is a costly operation. In this paper, a method for allo-cating resources such that the allocation can sustain the system in the light of a continuously changing en-vironment is developed. We introduce a novel perfor-mance metric called MAIL (maximum allowable in-crease in load) to capture the eectiveness of a resource allocation. Given a resource allocation, MAIL quan-ti es the amount of additional load that can be sus-tained by the system without any performance viola-tions. A Mixed-Integer-Programming-based approach (MIP) is developed to determine a resource allocation that has the highest MAIL value. Using simulations, several sets of experiments are conducted to evaluate our heuristics in various scenarios of machine an
Experiments in the generation of high expansion foam/ experiences sur la production de mousse a haute expansion/ experimente zur erzeugung von stark blahendem schaum
No full textThe author describes a method developed to determine the effectiveness of various high expansion foaming agents based on the rate of foam production and film stability. Three foaming agents were studied in detail. The parameters governing the foam production, such as the nature and concentration of the foaming agents were investigated as a basis for the design of a foam generator.L'auteur a mis au point un essai de d\ue9termination de l'efficience des agents producteurs de mousse se basant sur les crit\ue8res de rapidit\ue9 de formation de la mousse et de son taux d'affaissement. Il a entrepris des \ue9tudes en vue d'\ue9laborer des agents actifs. Il a utilis\ue9 un mat\ue9riel de type habituel pour l'\ue9tude des param\ue8tres r\ue9gissant la production de mousse, tels la nature de l'agent, la forme et les mat\ue9riaux constitutifs du r\ue9seau formateur.Peer reviewed: NoNRC publication: Ye
Designing role-based view for object-relational databases
No full textIn a federated database system, a view mechanism is crucial since it is used to define exportable subsets of data ; to perform a virtual restructuring d ataset; and to construct the integrated schema. The view service in federated databa se systems must be capable of retaining as much semantic information as possible. The object-oriented ( 0 - 0 ) model was considered the suitable canonical data model since it meets the original criteria for canonical model selection. However, with the emergence of stronger object-relational (0 -R ) model, the re is a clear argument for using an 0 - R canonical model in the federation. Hence, research should now focus on th e development of semantically powerful view mechanism for th e newer model. Meanwhile, the availability of real 0 -R technologies offers researchers the opportunity to develop different forms of view mechanisms.
The concept of roles has been widely studied in 0 - 0 modelling and development. The role model represents some characteristics that the traditional 0-0 model lacked, such as object migration, multiple occurrences and context-dependent access. While many forms of 0-0 views were designed for the 0-0 canonical model, one option was to extend the 0-0 model to incorporate a role model. In a role model, the real entity is modelled in the form of a role rather than an object. An object represents the permanent properties of an entity is a root object; and an object represents the temporary properties of an entity is a role object.
The contribution of this research is to design a view system that employees the concept of roles for the 0 -R canonical model in a federated database system. In this thesis, an examination of the current 0 -R metamodel is provided first in order to provide an environment for recognising the roleview metadata and measuring the view performance; then a Roleview Definition Language (RDL) is introduced, along with the semantics for defining virtual classes and generating virtua l extents; finally, a working prototype is provided to prove th e role-based view system is implementable and the syntax is semantically correct
Evolutionary Computation and Parametric Pattern Generation for Airport Terminal Design
No full textIt is without doubt that airport terminals are some of the most com- plex building types in existence. Their scale, the nature of their func- tions, the strict security measures as well as the function-specific components and building equipment that is present in such build- ings are all factors that increase their level of complexity as a build- ing type. In a real design situation, dealing with the variety of design param- eters that the design of an airport terminal incorporates can be a dif- ficult task to manage and may sometimes become an impediment to the design process. Furthermore, solely because of the enormous amount of possible design solutions that exists even for a relatively small set of design parameters1, the discovery of optimal or near optimal solutions through a traditional design approach is not guar- anteed to happen. Given these assumptions, it has been proposed within the con- text of this project that the design of layouts for airport terminals be addressed by the use of computation-based design methods, specifically Parametric Modelling in combination with evolutionary algorithms, The combination of parametric modelling and evolutionary algorithms has been used consecutively in two scales: First in order to search for optimality regarding the layout of the terminal, and with regard to multiple design goals (accessibility, cost, sustainability, re- tail performance). A Multi Objective Evolutionary Algorithm (MOEA) is used to produce a series of Pareto Optimal solutions, out of which one is selected. Second, a parametric envelope system is applied to the selected layout, and it’s defining parameters are once again optimized, this time with regard to view, sunshading and material usage. Within the context of the project a case study has been performed which focuses on the design of a new terminal at the new Inter- national Airport site in Doha, Qatar. The flexibility of the proposed method allowed for the incorporation of site-specific evaluation cri- teria into the parametric model, allowing for an optimal site-specific solution to be generated, both in terms of layout and of building envelope.Computation & PerformanceBuilding TechnologyArchitectur
'Real-life experience':recurrence rate at 3 years with Hexvix(®) photodynamic diagnosis-assisted TURBT compared with good quality white light TURBT in new NMIBC-a prospective controlled study
No full textPURPOSE: To compare the recurrence rate at 3 years (RR-3y) for non-muscle invasive bladder cancer (NMIBC) between good quality (GQ) PDD-TURBT and GQWL-TURBT where PDD is used in routine practice for all new tumours.METHODS: All new, consecutive, NMIBC that received "good quality" criteria first TURBT across a university hospital service were prospectively recruited to this study over a 4-year period. Data were prospectively collected on all WL-TURBTs performed in 2007/8 and compared with PDD-TURBT from 2009/10. Only resection meeting strict "good quality criteria" were included from each cohort to control for resection quality, then cases were further matched 1:1 based on demographic and pathological criteria. The primary outcome was overall and risk group-specific recurrence rate at 3 years.RESULTS: Of 808 patients recruited, 345 had GQ-TURBT for NMIBC and were included. RR-3y was significantly less for GQ-PDD overall [RR-3y: GQ-PDD: 57/146 (39.0%), GQ-WL: 72/135 (53.3%) OR = 0.56 (0.35-0.90) p = 0.02] and on a 1:1 matched pair basis [RR GQ-PDD: 29/118 (24.6) vs. 59/118 (50.0) OR 0.33 (0.19-0.57) p < 0.001)]. Benefit was most marked in high-risk patients: RR-3y in high-risk patients treated with GQ-PDD was 25/48 (52.1%) vs. 28/35 (80%) for GQ-WL [OR 0.27 (0.10-0.74) p = 0.01].CONCLUSION: When adopted for all new bladder tumour resections in routine practice, PDD appears to be associated with significantly reduced recurrence rates at 3 years in our "real life" experience, particularly in high-risk patients.</p
Wavelet Estimators, Global Error Measures: Revisited
No full text: In the paper minimax rates of convergence for wavelet estimators are studied. For the problems of density estimation and non-parametric regression we establish upper bounds over a large range of functional classes and global error measures. The constructed estimate is simultaneously minimax (up to constant) for all L ß error measures, 0 ! ß 1. Key-words: minimax estimation, density estimation, non-parametric regression, Besov spaces, wavelet estimators. (R'esum'e : tsvp) This is the author to whom correspondence should be sent ; e-mail: [email protected]. Centre National de la Recherche Scientifique Institut National de Recherche en Informatique (URA 227) Universit e de Rennes 1 -- Insa de Rennes et en Automatique -- unit e de recherche de Rennes Estimateurs par Ondelettes, Majorations d'Erreur Globale R'esum'e : On 'etudie dans cet article la vitesse de convergence des estimateurs par ondelettes. Pour les probl`emes d'estimation de densit'e et de r'egression non-param'etrique..
- …
