1,721,627 research outputs found
sj-docx-1-npx-10.1177_1934578X221125433 - Supplemental material for Volatile Constituents and Anti-Osteoporotic Activity of the <i>n</i>-Hexane Extract From <i>Homalomena gigantea</i> Rhizome
No full textSupplemental material, sj-docx-1-npx-10.1177_1934578X221125433 for Volatile Constituents and Anti-Osteoporotic Activity of the n-Hexane Extract From Homalomena gigantea Rhizome by Ty Viet Pham, Hang Phuong Thi Ngo, Nhan Thi Thanh Dang, Hien Khoa Nguyen, Hanh Thi Nhu Hoang and Thanh Pham in Natural Product Communications</p
Comparing Taguchi-based RSM and ANN for shredder blade geometrical parameter optimization / Trieu Khoa Nguyen and Bach Phuong Ho Thi
Get PDFIn this study, a Taguchi-based RSM in conjunction with an ANN model was utilized to ascertain optimal geometric parameters for the shredding blade employed in a plastic bottle shredder. The shredding process is pivotal in plastic recycling, involving the reduction of waste plastic into smaller fragments to facilitate subsequent transportation and processing. Despite existing research on plastic shredders, further investigations are warranted to optimize shredding blade design. Consequently, a numerical analysis, providing an in-depth insight into understanding the shredder parameters to elucidate the influence of geometric factors was conducted. Subsequent validation was carried out using experimental designs prescribed by the Taguchi-based RSM and ANN models. Both models were then evaluated based on predictive effectiveness and error against simulation data. The predictive outcomes presented that the ANN model resulted in better prediction capacity and lower prediction error than the RSM model, 0.16197 μm and 0.15567 μm, while the numerical validation value was 0.162 μm. Both the original and optimal blades were fabricated and utilized for experiments, illustrating lower wear after measurement using a microscope from ICamScope®. As a result, it is evident from this inquiry that this methodology presents a viable avenue for enhancing the efficiency of plastic recycling machinery and broader industrial applications
Zero-Knowledge Arguments for Lattice-Based Accumulators: Logarithmic-Size Ring Signatures and Group Signatures Without Trapdoors
No full textAn accumulator is a function that hashes a set of inputs into a short, constant-size string while preserving the ability to efficiently prove the inclusion of a specific input element in the hashed set. It has proved useful in the design of numerous privacy-enhancing protocols, in order to handle revocation or simply prove set membership. In the lattice setting, currently known instantiations of the primitive are based on Merkle trees, which do not interact well with zero-knowledge proofs. In order to efficiently prove the membership of some element in a zero-knowledge manner, the prover has to demonstrate knowledge of a hash chain without revealing it, which is not known to be efficiently possible under well-studied hardness assumptions. In this paper, we provide an efficient method of proving such statements using involved extensions of Stern’s protocol. Under the Small Integer Solution assumption, we provide zero-knowledge arguments showing possession of a hash chain. As an application, we describe new lattice-based group and ring signatures in the random oracle model. In particular, we obtain: (i) the first lattice-based ring signatures with logarithmic size in the cardinality of the ring and (ii) the first lattice-based group signature that does not require any GPV trapdoor and thus allows for a much more efficient choice of parameters.Ministry of Education (MOE)Published versionBenoît Libert was supported by the “Programme Avenir Lyon Saint-Etienne de l’Université de Lyon” in the framework of the programme “Investissements d’Avenir” (ANR-11-IDEX-0007), by the French ANR ALAMBIC Project (ANR-16-CE39-0006) and by the European Union PROMETHEUS Project (Horizon 2020 Research and Innovation Program, Grant 780701). San Ling, Khoa Nguyen and Huaxiong Wang were supported by the Singapore Ministry of Education under Research Grant MOE2019-T2-2-083. Khoa Nguyen was also partially supported by Vietnam National University Ho Chi Minh City (VNU-HCM) under Grant Number NCM2019-18-01. Open Access funding enabled and organized by CAUL and its Member Institutions
Optimal Algorithmic Techniques of LASIK Procedures
No full textClinical wavefront-guided corneal ablation has been now the most technologically advanced method to reduce the dependence of glasses and contact lenses. It has the potential not only to eliminate spherocylindrical errors but also to reduce higher-order aberrations (HOA). Recent statistics show that more than 96% of the patients who received laser in situ keratomileusis (LASIK) treatment reported their satisfaction about the improvement on vision, six months after the surgery. However, there are still patients complaining that their vision performance did not achieve the expectation or was even worse than before surgery. The reasons causing the unexpected post-surgical outcome include undercorrection, overcorrection, induced HOA, and other postoperative diseases, most of which are caused by inaccurate ablation besides other pathological factors. Therefore, to find out the method to optimize the LASIK procedures and provide a higher surgical precision has become increasingly important. A proper method to calculate ablation profile and an effective way to control the laser beam size and shape are key aspects in this research to resolve the problem. Here in this Master of Philosophy degree thesis, the author has performed a meticulous study on the existing methods of ablation profile calculation and investigated the efficiency of wavefront only ablation by a computer simulation applying real patient data. Finally, the concept of a refractive surgery system with dynamical beam shaping function is sketched, which can theoretically overcome the disadvantages of traditional procedures with a finite laser beam size.Thesis (Masters)Master of Philosophy (MPhil)School of EngineeringFull Tex
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
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