1,725,490 research outputs found
Yang Gao, piano
No full textProgram for recital offered in partial fulfillment of the requirements for the degree of Doctor of Musical
Arts
Canonical dual solutions to nonconvex radial basis neural network optimization problem
No full textRadial Basis Functions Neural Networks (RBFNNs) are tools widely used in regression problems. One of their principal drawbacks is that the formulation corresponding to the training with the supervision of both the centers and the weights is a highly non-convex optimization problem, which leads to some fundamental difficulties for the traditional optimization theory and methods. This paper presents a generalized canonical duality theory for solving this challenging problem. We demonstrate that by using sequential canonical dual transformations, the nonconvex optimization problem of the RBFNN can be reformulated as a canonical dual problem (without duality gap). Both global optimal solution and local extrema can be classified. Several applications to one of the most used Radial Basis Functions, the Gaussian function, are illustrated. Our results show that even for a one-dimensional case, the global minimizer of the nonconvex problem may not be the best solution to the RBFNNs, and the canonical dual theory is a promising tool for solving general neural networks training problems. © 2014 Elsevier B.V.Radial Basis Functions Neural Networks (RBFNNs) are tools widely used in regression problems. One of their principal drawbacks is that the formulation corresponding to the training with the supervision of both the centers and the weights is a highly non-convex optimization problem, which leads to some fundamentally difficulties for
traditional optimization theory and methods.
This paper presents a generalized canonical duality theory for solving this
challenging problem. We demonstrate that by using sequential canonical dual transformations, the
nonconvex optimization problem of the RBFNN can be reformulated as a canonical dual problem (without duality gap).
Both global optimal solution and local extrema can be classified.
Several applications to one of the most used Radial Basis Functions, the Gaussian function, are illustrated.
Our results show that even for one-dimensional case, the global minimizer of the nonconvex problem
may not be the best solution to the RBFNNs
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Neochauliodes latus Yang, Gao & An
No full textNeochauliodes latus Yang, Gao & An (Figs. 6, 28–31) Neochauliodes latus Yang, Gao & An, 2004: 266. Diagnosis. Head and prothorax entirely yellow. Wings mostly grayish brown with large hyaline marks. Aedeagus strongly widened toward tip in lateral view. Description. Forewing length 34–36 mm, hindwing length 31–33 mm. Head entirely yellow. Compound eyes pale brown, ocelli yellow with black inner margin. Antenna black. Mouthparts yellow; maxillary palpus and labial palpus with apices black, mandible with apical half reddish brown. Prothorax yellow; meso and metanota pale brown with lateral margins black. Legs brown, with short, dense, yellowish brown setae; tarsi brown but sometimes darker; tarsal claws reddish brown. Wings grayish brown with large hyaline marks; pterostigma short, pale yellow. Forewing with two or three small spots on basal intercostal area and with entire apical half of intercostal area grayish brown; basal third of wing with spots and diffuse hyaline band; median transverse hyaline band distinct and extending from C to M; apical margin with several small subhyaline spots along longitudinal veins. Hindwing similarly marked; basal half mostly hyaline; median transverse hyaline band subquadrate, much larger than that of forewing. Veins brown. Rs 5 branched, R 2 apically 3 branched, R 3 and R 4 curved backward at tip; 3 crossveins between R 1 and Rs; M 2 branched; 1 A 2 branched. Abdomen dark. Male tenth tergum (Figs. 28, 30) in lateral view subquadrate; in dorsal view apex strongly inflated. Aedeagus (Figs. 28–29) heavily sclerotized, in ventral view suboblong, slightly widened toward tip; in lateral view with apex round and somewhat inflated. Female eighth sternum subtrapezoidal (Fig. 31) with posterior margin prominent; tenth tergum digitiform with pointed tip, obliquely directed dorsally; gonapophyses (Fig. 31) slightly longer than wide, obliquely directed dorsally. Material examined. Holotype ɗ, CHINA: Guangxi, Shangsi, Hongqilinchang, 350 m, 1999. V. 28, G.Q. Zhang (IZCAS). Paratypes: 2 ɗ, CHINA: same data as for holotype (IZCAS); 1 ɗ, CHINA: Guangxi, Shangsi, Hongqilinchang, 300 m, 1999. V. 29, X.Z. Zhang (IZCAS). 1 Ψ, CHINA: Guangxi, Jinxiu, 720 m, 1982. VI. 10, F. S. Li (CAU); 1 Ψ, CHINA: Guangxi, Jinxiu, 1982. VI. 12, C.K. Yang (CAU); 1 Ψ, CHINA: Guangxi, Jinxiu, 1982. VI. 17 (CAU). Distribution. China (Guangxi). Remarks. This species appears closely related to N. koreanus Weele in having the similar dark wings with large hyaline marks, but can be easily distinguished by the orange head, narrowed apical hyaline marks of the forewings, and the digitiform female tenth tergum. In N. koreanus, the head is brownish, the apical hyaline marks are much wider, and the female tenth tergum is thickened with a produced apical corner (Weele, 1910; Kimmins, 1954).Published as part of Liu, Xingyue & Yang, Ding, 2005, Notes on the genus Neochauliodes from Guangxi, China (Megaloptera: Corydalidae), pp. 1-24 in Zootaxa 1045 on pages 14-15, DOI: 10.5281/zenodo.16988
Sisyrina qiong Yang & Gao 2002
No full textSisyrina qiong Yang & Gao, 2002 (Figs. 6–8) Sisyrina qiong Yang & Gao, 2002: 288. Type locality: China (Hainan: Jiangfengling). Diagnosis. This species is characterized by the pale antenna with basal eight segments brown (Fig. 6A), the forewing with the distance between each crossvein of RP area and corresponding forking point of RP branch shorter than (about 0.7 times as long as) the length of corresponding RP fork (Fig. 7A), and the male gonocoxite 9 broad basally but rod-shaped distally and curved ventrad (Fig. 8). Re-description. Male. Body length 2.7 mm; forewing length 3.8 mm and width 1.3 mm; hindwing length 3.0 mm and width 1.3 mm. Body brown. Head (Fig. 6) mostly brown; compound eyes prominent and black. Scape brown, densely covered by long setae; swollen medially, about twice as long as wide; pedicel brown, slightly longer than flagellomere; flagellum partially damaged, remaining basal 23 flagellomeres on left antenna and 27 flagellomeres on right antenna, pale with basal six segments brown, each one densely covered by long setae. Maxillary and labial palpi pale brown; terminal segment of maxillary palpus triangular in lateral view, broadest at base, tapering distally. Thorax brown, covered by many short setae. Legs slender and pale brown, meso- and metacoxae brown; densely covered by long setae; tarsomere 1 equal to combined length of tarsomeres 2-4; pretarsal claws simple; arolium present. Forewing (Fig. 7A) oval, distally rounded; trichosors present along distal margin; dark longitudinal stripes present among longitudinal veins; pterostigma indistinct, with indistinctive crossveins; costal area with 10 crossveins proximad pterostigma; two scp-ra crossveins present basally and distally; ScP weakened distally, not running into RA; three ra-rp crossveins; RP with three main branches; MA dichotomously branched distally; two rp-ma crossveins present; MP branched into MP1 and MP2, both branches distally bifurcated or trifurcated; two ma-mp, one mp1-mp2 crossveins present; CuA with three pectinate and simple branches; three mp-cua crossveins; CuP, A1 and A2 simple; one cua-cup crossvein present; seven subapical gradates with each interrupted centrally by a rounded hyaline spot except anterior-most one and posterior-most one; distance between each crossveins of RP area and corresponding forking point of RP branch shorter than (about 0.7 times as long as) corresponding marginal RP fork; 2rp-ma, 2ma-mp and mp1-mp2 crossveins respectively connecting stem of MA, MP1 and MP2. Hindwing (Fig. 7B) oval, distally rounded; trichosors present along distal margin; pterostigma indistinct, with indistinctive crossveins; costal area with seven crossveins proximad pterostigma; ScP running into RA distally; RP with three main branches; two ra-rp crossveins; MA distally trifurcated; one rp-ma crossvein present; MP branched into MP1 and MP2, both branches distally bifurcated or trifurcated; two ma-mp and one mp1-mp2 crossveins present; CuA with four pectinate and simple branches; CuP, A1 and A2 simple; one a1-a2 crossvein present; seven subapical gradates with each interrupted centrally by a rounded hyaline spot except anterior-most one and posteriormost one. Abdomen (Fig. 8) pale brown; tergum and sternum indistinct; setae almost lost or indistinct due to the poor condition of preservation. Sternum 9 elliptical in lateral view and plate-shaped in caudal view, covered by many setae. Gonocoxite 9 broad basally, rod-shaped distally, and distinctly curved ventrad, covered by many setae. Gonocoxites 11 arcuate, dorsal and ventral margins sinuous, lateral margin angular; gonostylus 11 small and spinous, slightly bended ventrad. Ectoprocts covered by many short setae, posteromedially concaved nearly to its half-length, forming a V-shaped incision; rounded lateroventrally. Hypandrium indistinct. Female. Unknown. Type material. Holotype ♂, China: Hainan, Ledong Li Autonomous, Jianfengling Nature Reserve [18°71′N, 108°87′E], 16.XII.1974, Fasheng Li (CAU). Distribution. China (Hainan). Remarks. Sisyrina qiong has some characters greatly different from the other species of Sisyrina, i.e., the distance between each crossvein of RP area and corresponding forking point of RP branch shorter than the length of corresponding RP fork in forewing, and the 2rp-ma, 2ma-mp and mp1-mp2 crossveins respectively located on the forks of MA, MP1 and MP2 veins. In the other species of Sisyrina except S. tropica (the states of the above characters are unknown by lack of description), the distance between each crossvein of RP area and corresponding forking point of RP branch is nearly as long as or longer than the corresponding RP fork in forewing, and the 2rp-ma, 2ma-mp and mp1-mp2 crossveins are respectively located on the stems of MA, MP1 and MP2 veins. Concerning the male genital characters, the male gonocoxite 9 is broad basally but distally slenderly rod-shaped and curved ventrad in S. qiong, while this sclerite is elliptical in S. nirvana and S. tropica, and short and ovoid in S. fashengi sp. nov. Yang & Gao (2002) once doubted the generic affiliation of S. qiong based on its unique genital characters. However, we consider that the present placement of this species in Sisyrina should be correct by the presence of the combination of the following generic diagnostic character: three RP branches, seven subapical gradates, and male sternum 9 short and simple.Published as part of Yang, Ying & Liu, Xingyue, 2021, New spongillaflies of the genus Sisyrina Banks, 1939 (Neuroptera: Sisyridae) from the Oriental faunal region, pp. 552-566 in Zootaxa 5052 (4) on pages 560-563, DOI: 10.11646/zootaxa.5052.4.5, http://zenodo.org/record/557731
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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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