102,200 research outputs found
Using penalized spline, generalized additive model and mixed model regression techniques to examine univariate and multivariate time series and in particular business cycles
No full textTeuber T. Using penalized spline, generalized additive model and mixed model regression techniques to examine univariate and multivariate time series and in particular business cycles. Bielefeld: Universität Bielefeld; 2013
Assessment of mirror movements in children and adolescents with unilateral cerebral palsy: reliability of the Woods and Teuber scale
No full textAIM To investigate the inter- and intrarater reliability of the Woods and Teuber scale todetect mirror movements in children and adolescents with unilateral cerebral palsy (CP).METHOD A convenience sample of children and adolescents with unilateral CP (n=68; 31males, 37 females; mean age 12y 2mo, SD 3y 6mo) in Manual Ability Classification levels I toIII was recruited from Norway, Australia, and Belgium. Three therapists scored mirrormovements according to the Woods and Teuber scale from three video-recorded tasks at twoseparate time points. A two-way, mixed model regression was used to calculate intraclasscorrelation coefficients (ICCs) reflecting overall inter- and intrarater reliability. In addition,ICCs for each hand and task were calculated separately.RESULTS The overall interrater reliability ICC was 0.90 and the corresponding intraraterreliability ICC was 0.92. The ICCs for each hand ranged from 0.86 to 0.92 and for each taskfrom 0.63 to 0.89.INTERPRETATION The Woods and Teuber scale shows excellent reliability for scoring mirrormovements in children and adolescents with unilateral CP. The assessment is easy toadminister with no need for specific equipment and scoring can be determined from shortvideo recordings, making it a feasible instrument in research and clinical practice.status: Published onlin
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Recommended from our members
3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
Advanced quantum cascade laser infrared attenuated total reflection spectroscopy
No full textThe overarching topic of this cumulative thesis is the development and application of next-generation quantum cascade laser (QCL) based infrared attenuated total reflection (IR-ATR) infrared spectroscopy.
Cascade lasers (i.e., interband and quantum cascade lasers; ICLs, QCLs) are considered the most advanced mid-infrared light sources, as discussed and exemplified in the introduction section of this dissertation. The characteristic properties of quantum cascade lasers include a broad spectral coverage and tunability in the mid-infrared range (MIR; 3 – 12 µm), well-defined spectral properties, and a high energy density within the emitted spectral band. As a result, spectroscopic information can be obtained based on differentiating molecular signatures. Consequently, the remainder of this cumulative thesis focuses on a variety of analytical applications capitalizing on the unique properties of cascade lasers presented as a series of peer-reviewed research articles.
If laser light sources are combined with appropriate transducers, numerous application opportunities arise in a variety of scenarios ranging from environmental monitoring to bioanalytics. Hence, the development of innovative sensor technologies is an important yet challenging topic. The main purpose of the transducer in optical sensors is to ensure reproducible interaction between the sample and the photons, i.e., herein, light emitted by the laser light source. This is of particular interest if optical sensing technologies aim at taking advantage of inherent molecular specificity without additional chem/bio recognition architectures, as is the case for mid-infrared spectroscopic concepts. While the aforementioned scenarios – environmental vs. life science applications – clearly have their specific needs and requirements, both may capitalize on similar fundamental photonic concepts and building blocks, which are at the core of the present thesis, i.e., mid-infrared laser and mid-infrared waveguide technology.
Analyzing molecular constituents in real-world environmental scenarios requires measurement techniques that may particularly withstand harsh external conditions while providing robust and reliable analytical data. Only a few infrared spectroscopic systems have been developed for harsh environments with most devices in routine practice being deployed in appropriate research facilities providing for a constant measurement environment without the need for portable or mobile devices. Among the most robust sensing concepts in mid-infrared photonics are transducers/sampling interfaces based on single or multiple reflection waveguides facilitating IR-ATR (i.e., evanescent field absorption) spectroscopy, which are readily adaptable to harsh conditions as shown in the present thesis. To this end, conventional multi-reflection ATR concepts were augmented with substrate-integrated hollow waveguide (iHWG) technology pioneered by our research team yielding an exceedingly robust modular transducer platform. This was achieved by developing an iHWG-based invariant light coupling concept for coupling IR photons to an ATR waveguide without the need for any additional optics in a robust and compact arrangement. This innovative assembly was proven useful for conventional broadband IR spectroscopy using Fourier transform infrared spectrometers, as well as QCLs. In the course of this thesis, a robust MIR sensor system was developed for mobile measurement applications at harsh environmental or process analytical conditions. The versatility of the developed sensor technology was demonstrated by coupling to a variety of light sources, the optional use of MIR fiberoptics, and by investigating a series of relevant analytes.
Bioanalytical sensing technologies frequently require addressing exceedingly small sample volumes/quantities or directly addressing live biological specimens or systems. This requires biocompatible and chemically inert transducers when probing samples in life science applications. To this end, diamond is an ideal waveguide material that next to its inertness and biocompatibility provides a broad spectral transmission window that extends well into the MIR regime, which is of particular interest for the present thesis. While conventional diamond ATR crystals with only a few internal reflections readily exist, the present thesis was focused on optimizing frequency-matched thin-film diamond waveguide technology ideally combining with QCL light sources. Using nanocrystalline diamond layers with a thickness of around 20 µm, near single-mode waveguiding behavior has been achieved yielding a homogeneous evanescent field at the waveguide surface rather than hotspots, as encountered via discrete internal reflections using macroscopic ATR waveguides. Thereby, highly miniaturized sensing concepts are facilitated without trading off size against sensitivity. The performance and quantitative analytical capabilities of QCL-based MIR sensors combined with thin-film diamond waveguides were compared to conventional IR-ATR technology for the exemplary analyte caffeine, which is among the most commonly ingested psychoactive substances found in simulating beverages such as tea, coffee, or energy drinks.
The utility of the developed sensing concepts was also shown for the analysis of live biological specimens, i.e., model bacteria, whereby biofilm formation processes were studied in molecular detail using QCLs combined with diamond thin-film waveguide technology for the first time. Different growth phases of bacteria were analyzed and compared with conventional IR spectroscopic data confirming the feasibility of IR laser spectroscopy for complex bioanalytical application scenarios.
Finally, even though QCLs combined with diamond thin-film waveguide technology gave rise to adequately sensitive measurement concepts, there are analytical scenarios where even more sensitivity is required. Hence, it was shown that the strategy of surface-enhanced infrared absorption (SEIRA) spectroscopy may be readily adapted for harnessing the MIR sensing technologies developed in this thesis, especially by using graphene for amplifying selected infrared signatures.
In summary, the results of this cumulative thesis were published within ten peer-reviewed contributions in leading international journals, including seven of them as a first author. A review contribution introduces the fundamentals of cascade lasers and their applications providing selected highlight examples published as a book chapter. The obtained research results address two main areas – environmental/process analytical scenarios and bioanalytics – demonstrating the versatility of waveguide-based laser spectroscopy in the mid-infrared contributing three publications each to robust IR-ATR concepts suitable for harsh environments, and to advanced thin-film diamond waveguide technology for bioanalytical scenarios
The Right to Strike under the United States Constitution: Theory, Practice, and Possible Implications for Canada
No full textAnswering critics of the Canadian Supreme Court's judgment in B.C. Health, the author argues that the Court laid the foundation for a principled and durable doctrine protecting constitutional labour rights, one that goes directly to the heart of the matter — the inequality of workers’ power in the employment relation. In the author’s view, two paths could lead from B.C. Health to the recognition of Charter protec- tion for a right to strike: one that treats the right as an accessory to col- lective bargaining, and one that upholds the right directly on the basis of the Charter values of equality and participation. The author supports the latter approach, contending that constitutional rights should be defined in relation to fundamental values, in a way that is not contingent on time-bound or fact-sensitive assessments about the role of strikes within a particular collective bargaining regime. Although a Charter right to strike may involve the courts in difficult choices about when to defer to legislative policy decisions, and courts may lack the institutional capac- ity to deal effectively with labour law issues, the author points out that judges can look to ILO standards for expert guidance. Noting that the U.S. experience in this area might be of considerable use to Canadians, the author concludes by providing an overview of American case law concerning a constitutional right to strike.Peer reviewe
G-Rank: Unsupervised Continuous Learn-to-Rank for Edge Devices in a P2P Network
No full textRanking algorithms in traditional search engines are powered by enormous training data sets that are meticulously engineered and curated by a centralized entity. Decentralized peer-to-peer (p2p) networks such as torrenting applications and Web3 protocols deliberately eschew centralized databases and computational architectures when designing services and features. As such, robust search-and-rank algorithms designed for such domains must be engineered specifically for decentralized networks, and must be lightweight enough to operate on consumer-grade personal devices such as a smartphone or laptop computer. We introduce G-Rank, an unsupervised ranking algorithm designed exclusively for decentralized networks. We demonstrate that accurate, relevant ranking results can be achieved in fully decentralized networks without any centralized data aggregation, feature engineering, or model training. Furthermore, we show that such results are obtainable with minimal data preprocessing and computational overhead, and can still return highly relevant results even when a user’s device is disconnected from the network. G-Rank is highly modular in design, is not limited to categorical data, and can be implemented in a variety of domains with minimal modification. The results herein show that unsupervised ranking models designed for decentralized p2p networks are not only viable, but worthy of further research.https://github.com/awrgold/G-RankComputer Scienc
- …
