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First report of the microgastropod Ammonicera japonica (Omalogyridae Habe, 1972) in Korea
Tsukasa Waki,이희정,박상률,박진순,권혁준,최광식 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.2
The intertidal zone of Jeju Island, Korea, is characterized by well-developed volcanic rocks with high wave action. During low tide, numerous small tidal pools are formed on the rocky intertidal zone, which provide shelter and habitats for benthic organisms. Previous investigation indicated that many species of micromolluscans inhabit the tidal pools; however, only a few studies have reported the ecology and identification of these microshells. In this study, we have identified a microgastropod, Ammonicera japonica Habe, 1972 (Omalogyridae), from a tidal pool on the southern coast of Jeju Island. Morphological identification of the species was based on scanning electron microscopy (SEM) of the protoconch and teleoconch. A. japonica was found to be associated with encrusting coralline algae distributed on the bottom of the tidal pools. This is the first report of A. japonica from Korea, and the specimen was registered at the National Marine Biodiversity Institute of Korea (MABIK MO00157413).
Tsukasa Waki,Emilio Rolán,Ronald. G. Noseworthy,강현실,최광식 한국해양과학기술원 2017 Ocean science journal Vol.52 No.4
A species of the genus Ammonicera Vayssière, 1893 collected from coralline algae communities in Jeju Island, South Korea, is described as a new species, A. aurea, for science. Its morphological characters are described and illustrated by SEM micrographs. This new species can be clearly distinguished from other Ammonicera species from the Pacific Ocean by the presence of a spiral cord and about 25 slightly-elevated axial ribs, resulting in about 25 nodules at intersecting points of the cord and ribs on the last whorl of the teleoconch.
First report of Vexillum zelotypum Reeve 1845 (Costellariidae: Neogastropoda) in Korea
Tsukasa Waki,Ronald G. Noseworthy,최광식 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.1
The costellariid gastropod Vexillum zelotypum Reeve 1845a is reported for the first time on Jeju Island. Four Costellariidae species are now part of the island's mollusk fauna. Comparisons are made with the original description and descriptions in the literature; some taxonomic comments are also made. The addition of new record to the island's fauna may be the result of previous insufficient sampling, global warming, and possible changes in the warm currents flowing northward to Japan and Korea.
Recovering 3-D Shape of a Non-rigid Object by a Single Mobile Camera
Tsukasa Horinouchi,Joo Kooi Tan,Hyoungseop Kim,Seiji Ishikawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper describes a technique for recovering 3-D shape of a non rigid object employing a single camera. 3-D modeling of a non-rigid object has been studied employing multiple cameras. However it can be realized even by a single camera on condition that the object concerned is composed of a set of rigid objects. Experimental results show effectiveness of the proposed technique.
Application of Large Eddy Simulation to Diesel Spray
Tsukasa Hori,Jiro Senda,Tanaka Hiroshi,Kyosuke Irie,Kazuya Machida,Yasuo Moriyoshi,Hajime Fujimoto 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The validation of an evaporative spray simulation with LES has been conducted using Rayleigh scattering method. Rayleigh scattering method is able to measure the instantaneous equivalence ratio on the spray cross section, assuming adiabatic mixture between ambient gas and fuel to estimate the mixture temperature. It is used to validate an evaporative spray simulation with LES. The results showed that the LES simulation was possible to reproduce the evaporative spray development in the quasi-steady condition, using the finer computational grid. In order to improve the computational accuracy, the radial development of the gas velocity from the spray upstream should be reproduced by the improvement of the computational scheme and the spray modeling.
Development of millimeter wave radar front-end for car collision avoidance using NRD guide
Tsukasa Yoneyama,신천우 에스케이텔레콤 (주) 1999 Telecommunications Review Vol.9 No.4
We've succeeded in developing a millimeter wave FM-CW radar that has a power of 10 mW at a frequency of 60 GHz. With the use of the radar, a vehicle which is 150m away from it, can be detected and even a small sized obstacle can also be detected. Since the radar adopts an NRD guide to propagate a millimeter wave, it can be produced at a low production cost. we can also, fabricate a millimeter wave radar of high quality in a convenient way because it is small in size and has a simple circuit. With those great capabilities, the radar is expected to fully function as a car collision avoidance radar. In addition, owing to its high quality of reproduction, it can be produced in large numbers and before long, it would be put into practical use.
Tsukasa Ishida,Harold Jacob,Takashi Toyonaga 대한상부위장관ㆍ헬리코박터학회 2014 Korean Journal of Helicobacter Upper Gastrointesti Vol.14 No.3
Endoscopic submucosal dissection (ESD) has enabled en-bloc resection of superficial gastrointestinal tumors regardless of the size or location of the tumor. However ESD still poses a number of challenges for the experienced endoscopist. These challenges include the adaptation of a demanding technique, the higher incidence of complications, and a longer procedure time compared to standard endoscopic procedures. In this article, we describe the performance of ESD using the Flush Knife technique. We emphasize that the most important factor in the performance of ESD using the Flush Knife technique is maintaining the appropriate depth of dissection. Appropriate dissection of the branched vascular network at the mid-submucosal layer is required to reach the avascular stratum just above the muscle layer. This should be accomplished using the horizontal approach, such that the dissection plane remains as horizontal as possible with respect to the muscle layer. This approach will enable the interventional endoscopist to treat difficult cases with large vessels and severe fibrosis. And at the same time will secure high-quality resected specimens with excellent basal margins so that depth of invasion can be assessed very accurately. Endoscopic submucosal dissection (ESD) has enabled en-bloc resection of superficial gastrointestinal tumors regardless of the size or location of the tumor. However ESD still poses a number of challenges for the experienced endoscopist. These challenges include the adaptation of a demanding technique, the higher incidence of complications, and a longer procedure time compared to standard endoscopic procedures. In this article, we describe the performance of ESD using the Flush Knife technique. We emphasize that the most important factor in the performance of ESD using the Flush Knife technique is maintaining the appropriate depth of dissection. Appropriate dissection of the branched vascular network at the mid-submucosal layer is required to reach the avascular stratum just above the muscle layer. This should be accomplished using the horizontal approach, such that the dissection plane re-mains as horizontal as possible with respect to the muscle layer. This approach will enable the interventional endoscopist to treat difficult cases with large vessels and severe fibrosis. And at the same time will secure high-quality resected specimens with excellent basal margins so that depth of invasion can be assessed very accurately. (Korean J Helicobacter Up Gastrointest Res 2014;14:163- 173)