6,029 research outputs found
Multivariable norm optimal iterative learning control with auxiliary optimization
No full textThe paper describes a substantial extension of Norm Optimal Iterative Learning Control (NOILC) that permits tracking of a class of finite dimensional reference signals whilst simultaneously converging to the solution of a constrained quadratic optimization problem. The theory is presented in a general functional analytical framework using operators between chosen real Hilbert spaces. This is applied to solve problems in continuous time where tracking is only required at selected intermediate points of the time interval but, simultaneously, the solution is required to minimize a specified quadratic objective function of the input signals and chosen auxiliary (state) variables. Applications to the discrete time case, including the case of multi-rate sampling, are also summarized. The algorithms are motivated by practical need and provide a methodology for reducing undesirable effects such as payload spillage, vibration tendencies and actuator wear whilst maintaining the desired tracking accuracy necessary for task completion. Solutions in terms of NOILC methodologies involving both feedforward and feedback components offer the possibilities of greater robustness than purely feedforward actions. Robustness of the feedforward implementation is discussed and the work is illustrated by experimental results from a robotic manipulator
Beth Nguyen: 47th Annual ODU Literary Festival
No full textBeth Nguyen is the author of the recent memoir Owner of a Lonely Heart, which was a New York Times Editors’ Choice Pick, as well as the memoir Stealing Buddha’s Dinner, and two novels. She has received an American Book Award and a PEN/Jerard Award and her work has appeared in publications including The New Yorker, The Paris Review, Time, and Best American Essays. She teaches at the University of Wisconsin–Madison, where she also directs the MFA Program in Creative Writing
FIGURE 1. Parahellenia trongduyii. A. Rhizome with a terminal bud. B. Leafy shoot. C. Nodes with leaf bases. D in Taxonomic studies on Parahellenia (Costaceae) in Vietnam: a new species, P. trongduyii, and a new combination, P. candida
No full textFIGURE 1. Parahellenia trongduyii. A. Rhizome with a terminal bud. B. Leafy shoot. C. Nodes with leaf bases. D. Node with an axillary bud. E. Inflorescence with flowers. F. Bract, bracteole, ovary and calyx. G. Flower. H. Flower (calyx, corolla lobes and labellum removed). I. Longitudinal section of a flower. J. Corolla lobes (abaxial and adaxial views). K. Stamen and labellum. L. Longitudinal sections of a fruit. M. Stamen (abaxial and adaxial views). N. Stamen (lateral view). O. Stigma (from left to right: lateral view, abaxial view and adaxial view). Drawn by Mr. D.H. Cui from the type V.C. Nguyen & V.K. Nguyen CD 01.Published as part of Chen, Juan, Nguyen, Van Canh, Nguyen, Van Khuong, Nguyen, Khang Sinh, Nuraliev, Maxim S. & Xia, Nianhe, 2023, Taxonomic studies on Parahellenia (Costaceae) in Vietnam: a new species, P. trongduyii, and a new combination, P. candida, pp. 72-80 in Phytotaxa 583 (1) on page 75, DOI: 10.11646/phytotaxa.583.1.7, http://zenodo.org/record/760919
Suggestions for improvement in Vietnam employment laws in the context of gender equality
No full text5 p.Improving gender equality in the workplace is an urgent task for Vietnam Communist Party and the Government. Despite the ratification of international conventions on labour, women rights, as well as amendment to relevant domestic laws, it appears that the provisions have not satisfied the requirements set forth to combat discrimination at work against women. Through this article, the author intends to propose some ideas to improve the laws on the protection of the current female workers’ rights based on the 2012 Labour Code (amended and supplemented in 2019), related laws and sub–law documents
Citizen's Satisfaction With Public Administrative Services At The One-Stop Shop Of Districts In Thai Nguyen Province, Viet Nam
No full textThe research was conducted to determine the factors affecting Citizens's satisfaction with public administrative services in the one-stop department of districts in Thai Nguyen Province. The study is based on the survey data of 324 citizens. Data analysis method through SPSS software with descriptive statistical tools, test scale with Cronbach alpha coefficients, discovery factor analysis (EFA) and Regression analysis was performed to clarify the problems related to the research hypothesis. The Regression model consisting of six variables: Capacity of civil servants, Service attitude of civil servants, Facilities, Work assignment process, Time and Cost is used to identify the factors that affect Citizens's satisfaction. The research results show that the variables in the model have a positive relationship with Citizens's satisfaction. In particular, the Capacity of civil servant factor has the highest Beta coefficient of 0.303. From the research results, the author also proposed a number of solutions to improve the satisfaction of citizens at the One-stop shop of districts in Thai Nguyen Provinc
Dendrelaphis binhi Nguyen & Nguyen & Le & Nguyen & Vo & Vo & Che & Murphy 2023, sp. nov.
No full text<i>Dendrelaphis binhi</i> sp. nov. <p> <b>Holotype.</b> ITBCZ 6663, adult male, collected from Tuy Phong, Binh Thuan Province, Vietnam; coordinates 11 o 12’36.2”N, 108 o 41’43.2”E; elevation 34 m a.s.l. by S.N. Nguyen and L. T. Nguyen, on 23 July 2018 (Figs. 3 & 4).</p> <p> <b>Paratypes.</b> Seven specimens: ITBCZ 6664, ITBCZ 6666 (adult females), ITBCZ 6665 (subadult male), collected by the same collectors, on the same date and site as the holotype; ITBCZ 6681 (adult male), collected from Tuy Phong, Binh Thuan Province, Vietnam, coordinates 11 o 13’03.3”N, 108 o 39’10.2”E, elevation 39 m a.s.l. by S.N. Nguyen and L. T. Nguyen, on 26 July 2018; ITBCZ 5944-6 (adult females), collected from Thuan Nam, Ninh Thuan Province, Vietnam; coordinates 11 o 19’18.4”N, 108 o 56’46.6”E; elevation 105 m a.s.l. by S.N. Nguyen and D.H. V. Nguyen, on 13 April 2017 (Figs. 3–5).</p> <p> <b>Diagnosis.</b> <i>Dendrelaphis binhi</i> <b>sp. nov.</b> is distinguished from all of its congeners by a combination of the following morphological characters: medium sized bronzeback snake (largest TL 936 mm in female); one long supralabial entering orbit; body scale smooth, 13 rows on neck and midbody, 9–11 before vent; vertebral scale row slightly enlarged; ventrals 154–158 in males and 161–170 in females; subcaudals 105 or 106 in males and 95–102 in females; 18 or 19 maxillary teeth, posterior teeth shorter than the others; hemipenis spinose, reaching 10 th or 11 th SC, with a tiny papilla; cloacal plate divided; dorsum bright brown with a white stripe along the lower flank.</p> <p> <b>Description of holotype</b>. Adult male; head elongate (HL/HW = 1.99), distinct from neck; body elongate, SVL 495 mm; tail long (TaL/TL = 0.305), 217 mm in length; eye quite large with round pupil, eye diameter shorter than snout length (ED/SnL: 0.76) (Table 3).</p> <p> <i>Head scalation</i>. Dorsal head scales smooth, abutting along midline rather than overlapping; rostral broader than high, visible from above, touching nasals, internasals and 1 st supralabial on both sides; supralabials 8/8, first fours small, the 5 th bordering eye on both sides, the 6 th small and triangle shaped, the 7 th and 8 th distinct larger than the 6 th and the first fours; 1/1 loreal, much longer than high (2.0 mm length vs. 0.8 mm height), touching nasal, internasal, prefrontal, preocular and the 2 nd and 3 rd supralabials; 1/1 preocular; 2/2 postoculars; 2+2/2+2 temporals; suture between internasals as long as that between prefrontals; frontal bell-shaped, widened anteriorly and much narrowed posteriorly (5.6 mm length, 3.6 mm width); parietals longer than frontal (6.5 mm vs. 5.6 mm length), bordered laterally by upper temporals and postocular and anteriorly by frontal and supraoculars; 10/10 infralabials, first pair medially in contact with each other, first five in contact with anterior chin shield, the 6 th largest and touching posterior chin shield; posterior chin shields slightly longer than anterior ones (5.1 mm vs. 4.9 mm) (Fig. 4A).</p> <p> <i>Body scalation.</i> Dorsal scales smooth, in 13-13-9 rows; lateral scales, except for the outer row, disposed obliquely; vertebral scale row slightly enlarged, narrower than the outer row of scales; scale row reductions from 13 to 11 at ventrals 89 and 90 and from 11 to 9 at ventrals 96 and 99; ventrals 158, with a suture-like lateral keel; cloacal plate divided; subcaudals 106, all paired; terminal caudal scale forming a pointed cap.</p> <p> <i>Dentition.</i> Maxillary teeth 18, continuously, the posterior teeth slightly smaller than the others.</p> <p> <i>Hemipenis.</i> Hemipenis unforked, reaching 11 th SC, spinose throughout, except for the apical naked area. The spines in the terminal half of the organ are largest. Sulcus spermaticus single, extending to tip, the sulcus lip prominent. On the apical naked area, there is a tiny lobule with small spines (Fig. 4B&C).</p> <p> <i>Coloration</i>. In life, dorsal and lateral parts of the body and tail bronze-brown, laterally this color extends to the upper half of the second scale row; upper part of head olive, lip and lower parts of the head and neck yellow; iris orange on the upper part and black on anterior, posterior, and lower parts of the eye; concealed parts of lateral scales light blue; a black temporal streak extending from eye to neck; a bright vertebral stripe on the anterior part of dorsum; two lateral stripes: a white one on the lower half of the second scale row and the upper half of the outer row and the second stripe is pale brown occurring on the lower half of the outer row and the edge of ventral scale; anterior part of the body with a series of black blotches at the suture between the lateral edge of ventral and the outer row, these blotches are less distinct or absent on the middle and posterior parts of the body; ventral white. In preservation, color faded but the pattern remained, all yellow parts becoming white.</p> <p> <b>Variation.</b> Paratypes ITBCZ 6665 and ITBCZ 5945 have 7 and 9 supralabials on the right side, respectively; paratypes ITBCZ 5945 and ITBCZ 5946 have 11 dorsal scale rows before vent; paratype ITBCZ 5946 has a short suture on the lower margin of the 5 th supralabial on both sides; paratype ITBCZ 5945 has the upper half of the second dorsal row black forming a black longitudinal line (Fig. 3E); lip and lower parts of head and neck yellow in all specimens collected in July in Tuy Phong, Binh Thuan Province but white in all snakes collected in April in Thuan Nam, Ninh Thuan Province. Table 3 summarizes variation in size and scalation of type series.</p> <p> <b>Sexual dimorphism.</b> Male has fewer ventral scales (V 154–158 in 3 males, 161–170 in 5 females) and slightly longer relative tail (TaL/TL 0.305–0.309 in 2 adult males; 0.277–0.297 in 5 adult females).</p> <p> <b>Etymology.</b> We name the new species in honor of Dr. Ngô Văn Bὶnh, a Vietnamese herpetologist who passed away suddenly in 2023 at the age of 49 by a serious stroke. We recommend “Binh’s Bronzeback Snake” and “Rắn leo cây bὶnh” as the common English and Vietnamese names of the new species, respectively.</p> <p> <b>Distribution.</b> The new species is currently known from Thuan Nam, Ninh Thuan Province and Tuy Phong, Binh Thuan Province, Vietnam (Fig. 1).</p> <p> <b>Field notes.</b> All specimens were collected at night, between 7:00 PM and 11:00 PM, while sleeping on brushes at about 1–2 m above ground. The habitat in Thuan Nam, Ninh Thuan Province is a coastal hill with brushes and granite outcrops (Fig. 5B) and the habitat in Tuy Phong, Binh Thuan Province is an agricultural area with scattered large brushes. The holotype was collected on a large brush group together with paratypes ITBCZ 6664 and ITBCZ 6665 and with two other individuals of <i>Ahaetulla fusca</i> (Dumeril, Bibron & Dumeril). Gravid paratype ITBCZ 5946 has three eggs.</p> <p> <b>Comparisons.</b> <i>Dendrelaphis binhi</i> <b>sp. nov.</b> differs morphologically from all congeners in Indochina as follows: from <i>D. biloreatus</i> (Wall, 1908) by having fewer ventrals (154–170 vs. 187–199), fewer subcaudals (95–106 vs. 139–145), one (vs. two) supralabial entering the eye, and vertebral scale row slightly enlarged (vs. strongly enlarged) (Smith 1943); from <i>D. caudolineatus</i> by having fewer ventrals in males (154–158 vs. 171–180), fewer ventrals in females (161–170 vs. 171–185), one (vs. two) supralabial entering the eye, and absence (vs. presence) of black longitudinal stripes along the entire length of the body (Rooijen & Vogel 2012); from <i>D. cyanochloris</i> (Wall, 1921) by having fewer midbody scale rows (13 vs. 15), fewer ventrals (154–170 vs. 181–206), fewer subcaudals (95–106 vs. 135–157), one (vs. two) supralabial entering the eye, and vertebral scale row slightly enlarged (vs. strongly enlarged) (Rooijen & Vogel 2008; Jiang <i>et al</i>. 2020); from <i>D. formosus</i> by having fewer midbody scale rows (13 vs. 15), fewer ventrals (154–170 vs. 172–194), fewer subcaudals (95–106 vs. 142–162), and one (vs. two) supralabial entering the eye (Jiang <i>et al</i>. 2020); from <i>D. haasi</i> by having fewer midbody scale rows (13 vs. 15), one (vs. two) supralabial entering the eye, and vertebral scale row slightly enlarged (vs. strongly enlarged) (Das 2015); from <i>D. kopsteini</i> Vogel & Van Rooijen, 2007 by having fewer midbody scale rows (13 vs. 15), one (vs. two) supralabial entering the eye, and vertebral scale row slightly enlarged (vs. strongly enlarged) (Vogel & Rooijen 2007); from <i>D. ngansonensis</i> by having fewer subcaudals (95–106 vs. 117–153), one (vs. two or three) supralabial entering the eye, vertebral scale row slightly enlarged (vs. strongly enlarged), fewer maxillary teeth (18 or 19 vs. 24 or 25), and shorter hemipenis (extending to SC 10 or 11 vs. SC 18) (Ziegler & Vogel 1999; Jiang <i>et al</i>. 2020); from <i>D. nigroserratus</i> Vogel, Rooijen & Hauser, 2012 by having fewer midbody scale rows (13 vs. 15), fewer ventrals (154–170 vs. 197– 204), fewer subcaudals (95–106 vs. 148–152), one (vs. three) supralabial entering the eye, and vertebral scale row slightly enlarged (vs. strongly enlarged) (Vogel <i>et al</i>. 2012); from <i>D. pictus</i> by having fewer midbody scale rows (13 vs. 15), fewer subcaudals (95–106 vs. 113–148), fewer maxillary teeth (18 or 19 vs. 23–28), one (vs. two or three) supralabial entering the eye, and vertebral scale row slightly enlarged (vs. strongly enlarged) (Smith 1943; Vogel & Rooijen 2008); from <i>D. striatus</i> by having fewer midbody scale rows (13 vs. 15), one (vs. two or three) supralabial entering the eye, and absence (vs. presence) of black oblique bars laterally on the body (Ziegler & Vogel 1999; Vogel & Rooijen 2007); from <i>D. subocularis</i> by having fewer dorsal scale rows at neck (13 vs. 15) and at midbody (13 vs. 15), and fewer maxillary teeth (18 or 19 vs. 21–23) (Smith 1943; Rooijen & Vogel 2010); from <i>D. tristis</i> by having fewer midbody scale rows (13 vs. 15), fewer subcaudals (95–106 vs. 108–145), one (vs. two) supralabial entering the eye, and longer hemipenis (extending to SC 10 or 11 vs. SC 8) (Smith 1943); from <i>D. vogeli</i> by having fewer midbody scale rows (13 vs. 15), one (vs. two) supralabial entering the eye, fewer ventrals (154–170 vs. 193–197), fewer subcaudals (95–106 vs. 130–135), and vertebral scale row slightly enlarged (vs. strongly enlarged) (Jiang <i>et al</i>. 2020); and from <i>D. walli</i> Vogel & Rooijen, 2011 by having fewer ventrals (154–170 vs. 193–197), fewer subcaudals (95–106 vs. 130–135), one (vs. two) supralabial entering the eye, and vertebral scale row slightly enlarged (vs. strongly enlarged) (Vogel & Rooijen 2011).</p>Published as part of <i>Nguyen, Sang Ngoc, Nguyen, Vu Dang Hoang, Le, Manh Van, Nguyen, Luan Thanh, Vo, Thi-Dieu-Hien, Vo, Ba Dinh, Che, Jing & Murphy, Robert W., 2023, A new snake of the genus Dendrelaphis Boulenger, 1890 (Squamata: Colubridae) from the coastal area of southern Vietnam, pp. 130-144 in Zootaxa 5318 (1)</i> on pages 136-139, DOI: 10.11646/zootaxa.5318.1.6, <a href="http://zenodo.org/record/8158335">http://zenodo.org/record/8158335</a>
Unifying Access and Resource Usage Control over Standard Client-Server Interactions
No full textWe propose a novel framework for integrated access and resource usage control over standard clientserver interactions. Historically, access control has been developed without considering resource usage. Resource control has thus developed as an ad hoc server-centric set of mechanisms (e.g., file system quota, network bandwidth quote, etc.). We believe that resource usage control is strongly related to access control and so should be implemented using a unified, global enforcement framework. We introduce such a framework, where services have resource usage constraints and principals have resource usage histories. To access and use a service, a principal must have the appropriate access and sufficient resource usage rights when considering its usage history. Our framework is able to enforce global stateful policies, yet do not require changes to existing message-passing applications. We have built a prototype and used it to specify and enforce an example policy that includes role-based control and delegation. We applied our system to control access and resource usage for three different services, network, DNS, and SMB file systems, to demonstrate its effectiveness and wide applicability.Technical report DCS-TR-67
Litinium quangi Tchesunov, Nguyen Dinh Tu & Nguyen Vu Thanh, sp. n.
No full textLitinium quangi Tchesunov, Nguyen Dinh Tu & Nguyen Vu Thanh sp. n. Figs 1, 2, Table 1 Material. Holotype male, three paratype males, allotype female and paratype female. All the specimens are deposited in the Vietnam National Museum of Nature (18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam) with slide numbers VNMN.0011 (holotype male, paratype male 3 and allotype female), VNMN.0012 (paratype male 1 and paratype female 1) and VNMN.0013 (paratype male 2). Locality. South Vietnam coast, Dong Nai River Delta, Can Gio National Reserve, 10 ° 32 ' 176 ''N and 106 ° 45 ' 919 ''E, 0.5 m deep. Sediment consisted of silt and clay (80.5 %) and sand (19.5 %). NaCl content 13.5 ‰. Description. Body very long and slender, filiform. Cuticle thick, smooth over entire body. Head slightly separated off by a very slight narrowing at the level of the cephalic setae. Cuticle anterior to the amphideal fovea 1–1.3 µ m thick, posterior to the amphideal fovea 1.6–2 µ m, posterior to the cardia 2–3.4 µ m, tail terminal cuticle 3.9–4.2 µ m. Six inner labial and six outer labial sensilla equal in length and shape. Both circles united in a joint crown of twelve short setae where outer labial setae situated just posterior to inner labial setae. Four equally short cephalic setae situated separately just posterior to the amphideal foveas in area of postcephalic narrowing. Amphideal fovea large, longitudinally ovoid, with distinct cuticularised horseshoe-shaped fringe; aperture round, with very fine rim, located at anterior end of fovea. A few short ventral, subventral and lateral papillae and tiny setae situated posterior to the amphideal fovea, anterior to the excretory pore, at 62–67 µ m from anterior end. A very minute midventral seta about 1 Μ m long present 10–12 Μ m anterior to the ventral pore. No metanemes found. Mouth opening tiny. Buccal cavity not developed as such and its walls not differentiated from the cuticular lining of the pharynx. Pharynx evenly muscular and slender throughout its length but widening gradually to the posterior end. Cardia widely conical and surrounded by intestinal tissue. Midgut lumen is partially filled with mass of fine granular material. Ventral pore at about half distance from anterior end to the nerve ring, and posterior to the midventral seta. Only anterior portion of ventral gland duct discernible. Vulva situated at ~ one fifth of body length from anterior end. Single posterior antidromously reflected ovary disposed ventrally and slightly to the left of the intestine. Uterus elongate and voluminous; uterus empty in both females examined. A short spermatheca just posterior to the uterus filled densely with minute round spermatozoa. Only anterior male gonad present, situated ventrally to the intestine. Spicules short, flat, arcuate, with internal cuticular linear longitudinal stripes, with posterior ends pointed and anterior ends slightly narrowed. One short (0.8–2, µ m long) midventral precloacal seta present, just anterior to the anterior ends of the spicules, 32–35 µ m from the cloacal opening. Tail very short, rounded. Terminal pore and canal well developed, slightly subterminal. A pair of short subventral seta mid-tail length in both males and females; one ventral papilloid sensilla situated at mid-tail length discernible in some specimens. Diagnosis. Litinium. Body length 2523–2918 µ m; a 81–118; c 72.1–97.2; c' 1.12–1.63. Inner labial, outer labial, cephalic setae very short, 1.4–2.6 µ m. Amphideal fovea ovoid in outline, with horseshoe-shaped cuticular rim. Cephalic setae at level of posterior end of the amphideal fovea. One precloacal midventral supplementary seta at level of anterior endof the spicules. Character Specimens Differential diagnosis. Litinium quangi sp. n. shares the ovoid shape of the amphideal fovea having a small round aperture with L. aequale, L. curticauda, L. parmatum, L. subterraneum and Litinium sp. 1 of Quang et al. (2008) but other known species have a fovea shaped as a half moon. Litinium quangi differs from all species by having only one midventral preanal seta instead of two or more setae. The female of L. quangi differs from L. parmatum with unknown males by having smaller anterior sensilla (1.1–2.5 vs 18 µ m) and a shorter rounded tail (c' 1.12 vs 4.2, conical tail). Litinium quangi differs from the most similar and sympatric species L. sp. 1 of Quang et al. (2008) by having shorter outer labial and cephalic setae (respectively, 2.1–2.6 µ m and 1.4–2.2 µ m vs 5.2 µ m and 4.4 µ m) and one vs two midventral precloacal setae. Litinium guangi differs from L. curticauda in the number of precloacal supplementary setae and by the greater distance from the head apex to the ventral pore (68–75 µ m vs 39.5–48 µ m), shorter spicules (30–33 µ m vs 43–49 µ m), slightly longer tail (c 72.1–94.1 and c ' 1.36–1.63 vs 110–119 and 0.83–0.94, respectively). Etymology. Species name is given in honour of Dr. Quang Ngo Xuan, the first author of the paper describing several Oxystominidae species from the Can Gio mangrove forest where two unnamed Litinium species were collected.Published as part of Tchesunov, Alexei V., Thanh, Nguyen Vu & Tu, Nguyen Dinh, 2014, A review of the genus Litinium Cobb, 1920 (Nematoda: Enoplida: Oxystominidae) with descriptions of four new species from two contrasting habitats, pp. 57-74 in Zootaxa 3872 (1) on pages 60-64, DOI: 10.11646/zootaxa.3872.1.5, http://zenodo.org/record/28722
Nouvelle méthode syntagmatique de vectorisation appliquée au self-organizing map des textes vietnamiens
No full text@inproceedings{CN-NGUYEN-2004, author = {Nguyen D.T.}, title = {Nouvelle méthode syntagmatique de vectorisation appliquée au self-organizing map des textes vietnamiens}, booktitle = {RECIRAL'04}, year = {2004}, address = {Fès, Maroc}, month = {avril} }National audienc
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