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J.Yoshitsugu,M.Ando,M.Rukonuzzaman,E.Hiraki,M.Nakaoka,K.Inoue 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a circuit of the quasi-resonant DC link to achieve soft-switching three phase inverter using intelligent IGBT power module. The soft-switching operation in this circuit is confirmed simulation and experimental results. Its conductive noise is measured for electrical AC motor drive as compared with that of the conventional hard switching inverter.<br/>
Resolving the long-standing enigmas of a giant ornithomimosaur Deinocheirus mirificus
Lee, Yuong-Nam,Barsbold, Rinchen,Currie, Philip J.,Kobayashi, Yoshitsugu,Lee, Hang-Jae,Godefroit, Pascal,Escuillié,, Franç,ois,Chinzorig, Tsogtbaatar Nature Publishing Group, a division of Macmillan P 2014 Nature Vol.515 No.7526
The holotype of Deinocheirus mirificus was collected by the 1965 Polish–Mongolian Palaeontological Expedition at Altan Uul III in the southern Gobi of Mongolia. Because the holotype consists mostly of giant forelimbs (2.4 m in length) with scapulocoracoids, for almost 50 years Deinocheirus has remained one of the most mysterious dinosaurs. The mosaic of ornithomimosaur and non-ornithomimosaur characters in the holotype has made it difficult to resolve the phylogenetic status of Deinocheirus. Here we describe two new specimens of Deinocheirus that were discovered in the Nemegt Formation of Altan Uul IV in 2006 and Bugiin Tsav in 2009. The Bugiin Tsav specimen (MPC-D 100/127) includes a left forelimb clearly identifiable as Deinocheirus and is 6% longer than the holotype. The Altan Uul IV specimen (MPC-D 100/128) is approximately 74% the size of MPC-D 100/127. Cladistic analysis indicates that Deinocheirus is the largest member of the Ornithomimosauria; however, it has many unique skeletal features unknown in other ornithomimosaurs, indicating that Deinocheirus was a heavily built, non-cursorial animal with an elongate snout, a deep jaw, tall neural spines, a pygostyle, a U-shaped furcula, an expanded pelvis for strong muscle attachments, a relatively short hind limb and broad-tipped pedal unguals. Ecomorphological features in the skull, more than a thousand gastroliths, and stomach contents (fish remains) suggest that Deinocheirus was a megaomnivore that lived in mesic environments.
Paulina-Carabajal, Ariana,Lee, Yuong-Nam,Kobayashi, Yoshitsugu,Lee, Hang-Jae,Currie, Philip J. Elsevier 2018 Palaeogeography, palaeoclimatology, palaeoecology Vol.494 No.-
<P><B>Abstract</B></P> <P>Ankylosaur braincase and endocranial morphologies are poorly known. Furthermore, cranial endocasts have been described for fewer than ten taxa so far. The complete inner ear morphology is known for only three species – <I>Euoplocephalus tutus</I>, <I>Kunbarrasaurus ieversi</I>, and <I>Pawpawsaurus campbelli</I>. Here, the first cranial endocast morphologies are presented for the Mongolian Cretaceous ankylosaurids <I>Talarurus plicatospineus</I> and <I>Tarchia teresae</I>. The study of paleoneurological features of these Mongolian taxa adds novel anatomical information to both species allowing the first comparison with ankylosaurids from North America. The development of a cerebellar flocculus that leaves an impression on the vestibular eminence – floccular recess – is observed in <I>Euoplocephalus</I>, <I>Talarurus</I> and <I>T</I>. <I>teresae</I>. Because this structure hasn't been identified in any nodosaurid so far, its presence in ankylosaurid cranial endocasts may represent a possible synapomorphy with unknown paleobiological implications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ankylosaur neuroanatomy is poorly known. </LI> <LI> The cranial endocasts of Talarurus and Tarchia are described by the first time. </LI> <LI> The presence of flocculus seems to be characteristic of the Ankylosauridae. </LI> <LI> Nodosaurids and ankylosaurids had different sense of hearing. </LI> </UL> </P>
Lee, Hang-Jae,Lee, Yuong-Nam,Adams, Thomas L.,Currie, Philip J.,Kobayashi, Yoshitsugu,Jacobs, Louis L.,Koppelhus, Eva B. Elsevier 2018 Palaeogeography, palaeoclimatology, palaeoecology Vol.494 No.-
<P><B>Abstract</B></P> <P>A theropod tracksite was discovered in the Nemegt Formation (Maastrichtian) at Bügiin Tsav, Mongolia by the Korea-Mongolia International Dinosaur Project in 2009. A total of 67 tracks (14 trackways [one didactylous, 13 tridactylous] and 12 isolated tracks) belonging to four ichnomorphotypes were mapped on a single horizon. This indicates at least four different theropod trackmakers lived in the same area at the same time. This tracksite consists of laminated gray mudstone-yellowish brown siltstone couplets interbedded with eolian yellowish brown sandstone deposited on a distal floodplain. Abundant footprints with V-shaped profiles (cross-section) within in the vertical section indicate that dinosaurs repeatedly walked across in this area. Before the discovery of the tracks, the site was illegally excavated by fossil poachers, a widespread problem in the Gobi Desert. During excavation of the track horizon, a clenched, inclined <I>Gallimimus</I> foot skeleton was found in the mudstone, extended down 20cm below the track-bearing sandstone layer. The occurrence of tracks closely associated with body fossils is unusual and taphonomically intriguing. It is possible that the foot skeleton represents an animal that died in its tracks. However, the depth of the foot in mud is probably too shallow for the animal to have been mired. Sedimentological and taphonomic evidence also suggests that the pes of <I>Gallimimus</I> may have passed straight through the track-bearing sandstone layer. The inclined right pes indicates that the body lay on its left side on the substrate. During decomposition in the mud, all digits were flexed but the distal phalanges were stuck and anchored in the stiff lower mud. Consequently, as more proximal phalanges were able to accommodate flexing, they were pulled away and dislocated from the anchored distal phalanges. Subsequent trampling by dinosaurs in the track-bearing sandstone would have further distorted the underlying foot.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The first report of theropod trackways from the Nemegt Formation in Bügiin Tsav, Mongolia </LI> <LI> Taphonomic interpretation of a <I>Gallimimus</I> foot skeleton associated with theropod tracks </LI> <LI> An interpretation of disarticulation and distortion of the foot skeleton is proposed. </LI> </UL> </P>