64,282 research outputs found
Hommage à M. Choi Seung-Un
No full textIl y a un an jour pour jour, le 13 octobre 2013, M. Choi Seung-Un nous quittait. Le jour anniversaire de sa disparition est l’occasion pour le Réseau des études sur la Corée de lui rendre un modeste hommage. Nous exprimons à sa veuve notre profonde sympathie en ce jour de souvenir. J’ai eu personnellement la chance et l’honneur de côtoyer M. Choi en tant qu’étudiant, puis en tant que collègue pendant dix ans à l’université Paris Diderot. M. Choi a connu et accompagné presque tous les stades d..
Franny Choi, 41st Annual ODU Literary Festival
No full textFranny Choi is a queer, Korean-American poet, playwright, teacher, organizer, pottymouth, GryffinClaw, and general overachiever. She is the author of Floating, Brilliant, Gone (2014), and a chapbook, Death by Sex Machine (2017). She has received awards from the Poetry Foundation and the Helen Zell Writers Program, as well as fellowships from the Vermont Studio Center and the Rhode Island State Council on the Arts. Her poems have appeared in journals including Poetry magazine, American Poetry Review, New England Review, and her work has been featured by the Huffington Post, PBS NewsHour, and Angry Asian Man
ACS AMI data - surface topography
No full textChoi, Changhyun, Yuan Ma, Xinyi Li, Xuezhi Ma, and M. Cynthia Hipwell. "Finger pad topography beyond fingerprints: understanding the heterogeneity effect of finger topography for human–machine interface modeling." ACS Applied Materials & Interfaces 13, no. 2 (2021): 3303-3310
SR paper data - thermal friction modulation
No full textChoi, Changhyun, Yuan Ma, Xinyi Li, Sitangshu Chatterjee, Sneha Sequeira, Rebecca F. Friesen, Jonathan R. Felts, and M. Cynthia Hipwell. "Surface haptic rendering of virtual shapes through change in surface temperature." Science Robotics 7, no. 63 (2022): eabl4543
Variations on the Choi-Jamiolkowski isomorphism
No full textThe Choi-Jamiolkowski isomorphism is an essential component in every quantum information theorist's toolkit: it allows to identify linear maps between two quantum systems with linear operators on the composite system. Here, we analyse this widely used gadget from a new perspective. Namely, we explicitly distinguish between its kinematical and dynamical properties, that is, we study the isomorphism on two different levels: Jordan algebras and the different C∗-algebras they arise from, which are distinguished by their order of composition.
A number of important and novel insights stem from our analysis. We find that Choi's theorem, which asserts that Choi's version of the isomorphism [M.-D. Choi, Lin. Alg. Appl., 10, 285 (1975)] further maps the positive cone of completely positive linear maps (such as quantum channels) to the cone of positive linear operators (such as quantum states) on the composite system, crucially
depends on the dynamical (compositional) structure in C∗-algebras. This in turn lies at the heart of the mismatch between the basis-dependence of Choi's version of the isomorphism, and the basis-independent version by Jamiolkowski [A. Jamiolkowski, Rep. Math. Phys., 3, 275 (1972)]. Here, we overcome this subtle but pervasive issue in a number of ways: first, we prove a version
of Choi's theorem for Jamiolkowski's isomorphism, second, we define a basis-independent variant of Choi's isomorphism and, third, by making explicit the dynamical distinction between Jordan and C∗-algebras, we combine the different variants of the isomorphism into a unified description, that subsumes their individual features. We also embed and interpret our results in the graphical calculus of categorical quantum mechanics.Full Tex
Biodistribution of <sup>177</sup>Lu-CHOI-3.1 in mice bearing OHS xenografts.
No full textBiodistribution of 177Lu-labeled chimeric OI-3 IgG1 isotype antibody (CHOI-3.1) in tissues of interest in OHS xenograft-carrying nude mice. At each time point from three to six animals were used, with number of tumors ranging from five to twelve per group. Straight lines have been drawn to connect the data points. The error bars correspond to the standard error of the mean.</p
Perceived instability of virtual haptic texture. II. Effect of collision-detection algorithm
No full textThis article reports the second study in a series that investigates perceived instability-unrealistic sensations associated with virtual objects-of virtual haptic texture. Our first study quantified the maximum stiffness values under which virtual haptic textures were perceived to be stable (Choi & Tan, 2004). The present study investigated the effect of the collision-detection algorithm by removing the step changes in force magnitude that could have contributed to perceived instability in the first study. Our results demonstrate a significant increase in the maximum stiffness for stable haptic texture rendering. We also report a new type of perceived instability, aliveness, that is characterized by a pulsating sensation. We discuss the possible cause of aliveness and show that it is not always associated with control instability. Our results underscore the important roles played by environment modeling and human haptic perception, as well as control stability, in ensuring a perceptually stable virtual haptic environment.X1118sciescopu
Andesipolis Whitfield & Choi, New
No full textAndesipolis Whitfield & Choi, New Genus Type species: Andesipolis masoni Choi & Suh, n. sp. (described below). Etymology: The generic name comes from the superficial resemblance to Rhysipolis, and from the Andean distribution of the genus. Diagnosis: Antennae 27–34 segmented, slightly longer than fore wing (Fig. 26). Malar suture present (Fig.18, 23). Ocelli in equilateral triangle, occipital carina complete, remaining separate from hypostomal carina to mandibular base (Fig. 12, 23). Maxillary palps 6 (sometimes appearing 7)segmented; labial palps 3 segmented. Pronope absent. Notauli short, covering only anterior part of mesonotum (Fig 6, 13, 14), shallow and narrowly elliptical midpit present (Fig 6, 13, 14). Epicnemial carina present (Fig. 5, 16, 20). Sternaulus present as a short groove on the posterior portion of mesopleuron (Fig. 5, 16, 20. Fore wing 2 a vein present (Fig. 1 3). Hind tibia without a fringe (comb) of spines on inner side of apex, or with a very poorly developed group of spines. Propodeum with (Figs. 7, 13, 21) or without (Fig. 15) welldefined areola, but when welldefined, usually elongate with a transverse carina dividing it into anterior and posterior portions. First tergite with distinct dorsope; dorsal carinae converging posteriorly (Fig. 7, 11, 15, 21). Ovipositor sheaths long and setose (Fig. 9, 17, 22). Distribution: Chile (Neotropical). Biology: Unknown. Comments: The new genus superficially resembles some species of Rhysipolis Förster in habitus (hence the name we have given it), and in addition in many details of the mesopleuron, wing venation and metasomal tergites. Unlike Rhysipolis, the forewing (Figs. 13) has a distinctly visible vein 2 a (not common within Braconidae yet found more basally within Hymenoptera). In addition the mesonotum has a longitudinal posterior groove as in many Hormiini and Rhyssalini (perhaps represented in an often less welldemarcated form in Pseudorhysipolis Scatilini, PenteadoDias and Achterberg), while the propodeum has a “double areola” pattern of carinae resembling especially Rhyssalini (figs. 7, 13, 21). The latter character has been proposed as likely to be plesiomorphic within Braconidae (Whitfield, 1988); some Rhysipolini also have a double areola, but of a different form (Spencer & Whitfield, 1999). Unlike typical Hormiini and Rhyssalini vein mcu meets RS + M before RS splits from M (in this respect resembling Rhysipolis, Exothecini and Rogadinae). Thus, the new genus Andesipolis has a unique combination of features that make it difficult to place to tribe or subfamily. This difficulty is largely due to the tribes and subfamilies not being very well defined in the first place. Its biology is unknown, but the typically long ovipositor (Figs. 9, 17, 22) resembles that of groups that attack hosts within shelters of leaf (Rhysipolis Shaw, 1983; Whitfield, 1992; Spencer & Whitfield, 1999) or stem tissue (Doryctine Marsh, 1997, or plant galls (Hydrangeocolini Oda et al., 2001; Belshaw et al., 2003). Andesipolis masoni Choi & Suh, n. sp. (Fig. 1, 4– 9) Female. Body length 2.6–2.9 mm; forewing length 3.5 mm. Head 1.1–1.2 X wider than mesoscutum. Face 1.6 X as broad at midheight as long medially, smooth and polished with scattered setae. Clypeus 2.6 X as broad as its height. Malar space 0.4 X eye height in frontal view. Eyes 1.2–1.3 X higher than width; eyes 1.6– 1.8 X longer than temple in lateral view. Vertex smooth and polished, with scattered setae. Occipital and hypostomal carinae remaining separate to mandibular base. Antennae slightly longer than forewing; 27–29 segmented. Maxillary and labial palps 6 and 3 segmented respectively. Mesosoma 1.8 1.9 X longer than high; 2.2–2.3 X longer than width between tegulae. Pronotum rugose dorsally; mostly polished laterally. Mesonotum weakly punctate with scattered setae; Notauli short, presenting only anterior onethird of mesonotum; midpit shallow and long, 0.4 0.6 X as long as mesonotum. Scutellum 1.2 X as long as width, smooth to weakly punctate and polished; scutellar sulcus 0.3 X as long as width. Propodeum with roughly pentagonal shape areola and distinct areolar crossbridge with irregular ridges arising inside of areola; median carina present; with irregular ridges around median carina and transverse carinae; polished anteriorlaterally. Hind coxa 2.0X as long as width, slightly shorter than first abdominal tergum, smooth and polished; hind tibial spur short, 0.24 X as long as basitarsus; hind tarsal claw simple. Wing Forewing: Stigma about 4.3 X longer than broad; vein r arising from middle of stigma; Vein r 0.5 X as long as vein 3 RSa. Vein 2 RS 0.8 X as long as vein 3 RSa. Vein 3 RSa 0.5 X as long as vein 3 RSb. Vein rm spectral, 0.6 X as long as vein 3 RSa. Vein 1 CUb 1.9 X as long as vein 1 CUa. Vein (RS+M)b present, short and spectral. Vein 1 1 AC 0.4 X as long as vein 2 1 A. Hindwing: Vein M+CU 1.9 X as long as vein 1 M. Vein cua 0.5 X as long as vein 1 M, slightly curved. Vein rm 0.6 X as long as vein 1 M. Metasoma Length of tergite I 0.8 X its apical width, distinctly sclerotized, reticulaterugose except granulate posteriordorsolateral portion; dorsal carinae converging but not jointed; dorsope rather large and deep. Tergite II and III smooth to granulate and polished, tergite II 1.9 X as long as tergite III. Hypopigium small. Ovipositor 0.8–0.9 X shorter than hind tibia, straight; ovipositor sheath 0.6 X shorter than ovipositor. Color Body generally orangebrown or brown; maxillary and labial palps pale yellow; antenna brown; mesosoma yellowish brown except brown scutellar sulcus; propodeum brown; legs orangebrown to brown. Male Unknown. Biology Unknown. Diagnosis This species can be distinguished from other Andesipolis species by the relatively short and straight ovipositor (the ovipositor is always shorter than the hind tibia). Material examined. Holotype. Female: Chile: Carelmapu, Llonquihue, 21–28.ii. 1957, L. E. Pena (CNC) Paratypes: 1 female, Chile: Pucotrihue, Valdivia, 11–13.iii. 1955, L. E. Pena (CNC); 1 female, Chepu, I. De Chiloé, 3.ii. 1952, Peña (CNC). Etymology. This species is named for the late W.R. M. Mason, who contributed a great deal to this work, as detailed above.Published as part of Whitfield, James B., Choi, Won-Young & Suh, Kyong-In, 2004, Andesipolis, a puzzling new genus of cyclostome Braconidae (Hymenoptera) from the Chilean Andes, with descriptions of three new species, pp. 1-15 in Zootaxa 438 on pages 3-5, DOI: 10.5281/zenodo.15724
Discochiton bambusae Choi & Lee 2023, sp. n.
No full text<i>Discochiton bambusae</i> Choi & Lee sp. n. <p>(Figs 1–4)</p> <p> <b>Material examined.</b> <b>Holotype:</b> 1 adult female mounted on a slide, Myanmar, Shan State / Ywangan / 21°22′48″N 96°47′87″E / coll. Jinyeong Choi / 25.v.2018 / <i>Bambusa tulda</i> (Poaceae) (SNU). <b>Paratypes:</b> 9 adult females mounted singly on slides, same data as holotype (SNU); 5 first-instar nymphs mounted together on 1 slide, same data as holotype (SNU).</p> <p> <b>Diagnosis.</b> Legs with all segments much reduced in length. Sclerotized plates present on venter, forming bands or patches submedially on body. Dorsal abdominal clear areas present in 4 pairs. Antenna 5–7 segmented. Each stigmatic cleft with 10–16 stigmatic spines. Dorsal marginal radial lines numbering about 22 around anterior margin of head, and each side with about 6 between stigmatic clefts and 18 on abdomen.</p> Description <p> <b>Unmounted material</b> (Fig. 1). Body of adult female flat and broadly oval. Body camouflaged on bamboo, greenish or yellowish (Fig. 1B, C). Dorsal surface sclerotized, translucent and reticulated, with many indentations (Fig. 1C). Ventral surface also slightly sclerotized, almost transparent but with white translucent areas submedially on body (Fig. 1D); central concave brood space also present (Fig. 1D). First-instar nymphs reddish, elongated oval (Fig. 1E, F, G).</p> <p> <b>Slide-mounted adult female</b> (Figs 2 and 3). Body circular to oval (broadest across abdomen), 10.1–14.5 mm long and 7.9–11.9 mm wide.</p> <p> <i>Dorsum</i>. Derm uniformly lightly to heavily sclerotized, with abundant areolations and small pale spots, some forming a polygonal pattern medially. Stigmatic rays broad, extending medially from each stigmatic cleft. Marginal radial lines indistinct, indicated by distribution of pores and setae; with about 22 on head between anterior stigmatic clefts, and on each side with about 6 between stigmatic clefts and about 18 on abdomen. Dorsal setae mostly flagellate but also rarely spinose, variable in length, each 6–57 μm long, with a broad basal socket 7–10 μm wide; sparsely present. Abdomen with 4 pairs of grouped clear areas (CA) submedially, numbered from anterior to posterior (Fig. 2K), each group surrounded by preopercular pores, each pore roundly convex, 3–6 μm wide, present as follows (number of clear areas in each group in brackets): CA1 with 22–40 (1–4), CA2 25–48 (1–3), CA3 31–43 (2–4) and CA4 with 29–40 pores (1–3). Other dorsal pores each 2–3 μm wide, each consisting of a ductule associated with an unsclerotized pale area, these pores forming a polygonal pattern medially and present in marginal radial lines with setae. Anal plates rather elongate, together quadrate, length of plates 251–293 μm, combined width 216–290 μm; each plate with anterior margin usually shorter than posterior margin, with 4 minute setae near posterior apex and 5 or 6 small pores medially. Anogenital fold with 3 or 4 minute setae at each corner with anterior margin, and each lateral margin with 1 seta anteriorly.</p> <p> <i>Margin</i>. Outer margins of stigmatic clefts with distinct irregular protrusions. Sclerotized ridges present submarginally, shallow, parallel with margin or extending inwards. Marginal setae broadly fan-shaped, each fan-shaped seta wider than long, about 28–53 μm wide and 18–39 μm long; numbering about 189–283 setae anteriorly on head between anterior stigmatic clefts, and each side with 87–107 between stigmatic clefts and 177–230 along abdominal margin. Stigmatic clefts quite deep, each with a narrow entrance, a highly sclerotized inner margin and 10–16 (usually 11–14) elongate, parallel-sided, blunt stigmatic spines. Eyespots displaced some distance from margin, each situated in a socket 41–68 μm wide, each lens 21–37 μm in diameter.</p> <p> <i>Venter</i>. Derm membranous only in medial area; rest of derm lightly to heavily sclerotized, with sclerotized plates forming a band submedially; with a cluster of plates just laterad to each antenna, a similar-sized cluster of plates just laterad to each mesothoracic leg, and a much longer band of plates on abdomen, extending from area laterad to each metacoxa to anal cleft (these plates larger and more distinct on older specimens)); sclerotized band on each side of thorax about 1–3 mm wide. Multilocular disc-pores abundant on either side of genital opening and on preceding segment only, each side with 61–104 on segment VII and 74–150 on segment VI. Spiracular disc-pores present between margin and each spiracle in a narrow band 1–5 pores wide, with 109–150 pores in each anterior band and 98–168 pores in each posterior band. Ventral microducts each 2–3 μm wide, densely present just posterior to and on either side of labium, along with several setae; also, sparsely present elsewhere. Ventral setae: a pair of long setae present medially on segment VII, each seta 68–90 μm long; and short to long setae frequently present on medial areas of abdominal segments VI–V, each 8–71 μm long; otherwise, setae short and very sparse; interantennal setae absent. Antennae reduced, each with 5–7 segments but occasionally with a pseudo-articulation in segment III; total length 231–350 μm. Clypeolabral shield 291–397 μm long. Spiracles: width of each anterior peritreme 99–112 μm and posterior peritreme 96–119 μm. Legs present but very small, each with 5 segments much reduced in length, each segment unclearly divided, claw denticles absent; claw digitules and tarsal digitules narrow; total length of prothoracic leg 167–206 μm, mesothoracic leg 115–243 μm and metathoracic leg 137–227 μm.</p> <p> <b>Comment.</b> The adult female of <i>D. bambusae</i> <b>sp. n.</b> differs from all other known <i>Discochiton</i> species in having: (i) a much larger body; (ii) a ventral band of sclerotisations in submedial areas of body; (iii) many stigmatic setae in each stigmatic cleft; and (iv) many marginal setae. While the morphology of the new species agrees with most character-states of <i>Discochiton</i>, the adult female displays a greater number of marginal radial lines and more stigmatic spines than are found on other <i>Discochiton</i> species. This may be due to the large body size of <i>D. bambusae</i>, which is the largest species in the genus, reaching approximately 15 mm long. In addition, the legs of <i>D. bambusae</i> are much reduced (similar to those of <i>D. paucipedis</i> (Hodgson)), whereas other species of <i>Discochiton</i> show only fully developed or completely reduced legs. Moreover, the sclerotized plate-like areas on the venter of <i>D. bambusae</i>, which extend in a submedial band from the antennae to the anal cleft, are unique and have not been recorded previously in other species of <i>Discochiton</i> (Hodgson & Williams, 2018).</p>Published as part of <i>Choi, Jinyeong & Lee, Seunghwan, 2023, A new species of Discochiton Hodgson & Williams (Hemiptera: Coccomorpha: Coccidae) on bamboo from Myanmar, pp. 479-487 in Zootaxa 5353 (5)</i> on pages 480-484, DOI: 10.11646/zootaxa.5353.5.6, <a href="http://zenodo.org/record/10010328">http://zenodo.org/record/10010328</a>
Classes of analytic functions associated with the Choi–Saigo–Srivastava operator
No full textAbstractWe investigate several properties of the linear Choi–Saigo–Srivastava operator and associated classes of analytic functions which were introduced and studied by J.H. Choi, M. Saigo and H.M. Srivastava [J.H. Choi, M. Saigo, H.M. Srivastava, Some inclusion properties of a certain family of integral operators, J. Math. Anal. Appl. 276 (2002) 432–445]. Several theorems are an extension of earlier results of the above paper
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