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Acta Geologica Sinica(English Edition) 2016年第6期90卷 1955-1975页

作者： LEE Seung-Bae LEE Dong-Chan WOO Jusun ZHANG Xingliang Geology Division Korea Institute of Geoscience and Mineral Resources Department of Earth Science Education Chungbuk National University Division of Polar Earth-System Sciences Korea Polar Research Institute Early Life Institute and State Key Laboratory of Continental Dynamics Department of GeologyNorthwest University

New morphologic information permits systematic revision of trilobites from the Middle Ordovician Klimoli Formation of the Zhuozishan area, Ordos Basin, Inner Mongolia. The new assemblage is composed of 10 species of the Raphiophoridae, Nileidae, Asaphidae, and Telephinidae.？ An asaphid, aff. Mioptychopyge lashachungensis （previously Paraptychopyge lashachungensis） displays an intermediate morphology between the Chinese nobiliasaphine genera Mioptychopyge and Zhenganites. The pygidial doublure is regarded as the most significant character to differentiate Symphysurus klimoliensis （previously Nileus klimoliensis） of the Nileidae from such closely allied taxa as Poronileus. A nileid, cf. Peraspis kujandensis displays typical nileid morphology, unlike the type species, Peraspis lineolata, which might turn out to be an asaphid. Ampyx gongwusuensis sp. nov. of the Raphiophoridae is the first record of the genus in the Zhuozishan area and reveals morphologic details that might be employed to resolve Ampyx taxonomy in China. Morphologic differences between A. gongwusuensis and Abulbaspis ordosensis might represent a case of sexual dimorphism.

关键词： Invertebrate paleontology Trilobita systematics Klimoli Formation Darriwilian Zhuozishan Inner Mongolia

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Successful endoscopic submucosal dissection of a giant polyp in a 21-month-old female

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World Journal of Gastroenterology 2014年第1期20卷 323-325页

作者： Eun-Young Jung Soon-Ok Choi Kwang Bum Cho Eun Soo Kim Kyung Sik Park Jin-Bok Hwang Department of Pediatric Surgery Division of Gastroenterology and HepatologyKeimyung University School of MedicineDaegu 700-712South Korea Department of Internal Medicine Division of Gastroenterology and HepatologyKeimyung University School of MedicineDaegu 700-712South Korea Division of Gastroenterology and Hepatology Department of PediatricsKeimyung University School of MedicineDaegu 700-712South Korea

Endoscopic submucosal dissection(ESD)is now recognized as the preferred treatment modality for gastrointestinal epithelial lesions.A 21-month-old female was admitted with a giant hyperplastic polyp causing a gastric outlet *** ESD was performed with *** post-procedural course was uneventful without a bleeding *** further study of the feasibility of ESD in early children is necessary,ESD could be applied to avoid laparotomy even in young children.

关键词： Obstruction Endoscopic submucosal dissection Infant Hyperplastic polyp

A case of Clostridium difficile infection complicated by acute respiratory distress syndrome treated with fecal microbiota transplantation

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World Journal of Gastroenterology 2014年第35期20卷 12687-12690页

作者： Ji Eun Kim Tae-Geun Gweon Chang Dong Yeo Young-Seok Cho Gi Jun Kim Jae Young Kim Jong Wook Kim Hyunho Kim Hye Won Lee Taeseok Lim Hyoju Ham Hyun Jin Oh Yeongbok Lee Jaeho Byeon Sung Soo Park Department of Internal Medicine Seoul St Mary’s hospitalThe Catholic University of KoreaCollege of Medicine Division of Gastroenterology Department of Internal MedicineSeoul St.Mary’s HospitalThe Catholic University of KoreaCollege of Medicine Division of Pulmonology Department of Internal MedicineUijeongbu St.Mary’s HospitalThe Catholic University of KoreaCollege of Medicine Division of Gastroenterology Department of Internal MedicineUijeongbu St.Mary’s HospitalThe Catholic University of KoreaCollege of Medicine

Acute respiratory distress syndrome is a life-threatening disorder caused mainly by *** difficile infection(CDI)is a common nosocomial diarrheal *** of normal intestinal flora by antibiotics is the main risk factor for *** use of broadspectrum antibiotics for serious medical conditions can make it difficult to treat CDI complicated by acute respiratory distress *** microbiota transplantation is a highly effective treatment in patients with refractory *** we report on a patient with refractory CDI and acute respiratory distress syndrome caused by pneumonia who was treated with fecal microbiota transplantation.

关键词： Clostridium difficile infection Acute respiratory distress syndrome Fecal microbiota transplantation

A BPR-CNN Based Hand Motion Classifier Using Electric Field Sensors

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Computers, Materials & Continua 2022年第6期71卷 5413-5425页

作者： Hunmin Lee Inseop Na Kamoliddin Bultakov Youngchul Kim Department of Computer Science Georgia State UniversityAtlanta30302USA Nat’l Program of Excellence in Software Centre Chosun UniversityGwangju61452Korea Department of Computer Inf.&Communication Eng. Chonnam Nat’l Univ.Gwangju61186Korea

In this paper,we propose a BPR-CNN(Biometric Pattern Recognition-Convolution Neural Network)classifier for hand motion classification as well as a dynamic threshold algorithm for motion signal detection and extraction by EF(Electric Field)***,an EF sensor or EPS(Electric Potential Sensor)system is attracting attention as a next-generationmotion sensing technology due to low computation and price,high sensitivity and recognition speed compared to other sensor ***,it remains as a challenging problem to accurately detect and locate the authentic motion signal frame automatically in real-time when sensing body-motions such as hand motion,due to the variance of the electric-charge state by heterogeneous surroundings and operational *** hinders the further utilization of the EF sensing;thus,it is critical to design the robust and credible methodology for detecting and extracting signals derived from the motion movement in order to make use and apply the EF sensor technology to electric consumer products such as mobile *** this study,we propose a motion detection algorithm using a dynamic offset-threshold method to overcome uncertainty in the initial electrostatic charge state of the sensor affected by a user and the surrounding environment of the *** method is designed to detect hand motions and extract its genuine motion signal frame successfully with high *** setting motion frames,we normalize the signals and then apply them to our proposed BPR-CNN motion classifier to recognize their motion *** experiment and analysis show that our proposed dynamic threshold method combined with a BPR-CNN classifier can detect the hand motions and extract the actual frames effectively with 97.1%accuracy,99.25%detection rate,98.4%motion frame matching rate and 97.7%detection&extraction success rate.

关键词： BPR-CNN dynamic offset-threshold method electric potential sensor electric field sensor multiple convolution neural network motion classification

Polygon formation of multiple nonholonomic mobile robots with double-level-control collision avoidance scheme

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Journal of Control and Decision 2023年第3期10卷 301-313页

作者： A.Widyotriatmo E.Joelianto A.M.Burohman J.J.Damanik Y.Y.Nazaruddin Instrumentation and control research group faculty of industrial technologyinstitut teknologi bandungbandungindonesia engineering and technology institute groningen university of groningengroningenthe netherlands caerospace engineering korea advanced institute of science and technologydaejeonsouth korea

This paper considers a polygon formation control of multiple robots with nonholonomic constraintsenclosing a goal target and double-level-control collision avoidance scheme. Doublelevel-control scheme consisted of upper-level and lower-level controls are proposed for trajectorygeneration and tracking control of multi-robot systems. Both upper-level and lower-levelcontrols operate collision avoidance mechanisms based on potential functions. The proposedcontrol scheme guarantees that the group of robots are kept in the polygon formation and drivento a goal, while avoiding collisions during the travel. Moreover, the designed interaction betweenthe upper- and lower-level controls guarantees that the mobile robots are not trapped in localminima or deadlock case. Experiments of the formation of three-robots are conducted to showthe performance of the mobile robots in accomplishing a polygon formation while achieving thegoal without any collision and no local minima.

关键词： Artificial potential function collision avoidance formation control multi-robot systems polygon formation

Creep damage characterization of Ni-based superalloy by acoustic nonlinearity

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Progress in Natural Science:Materials International 2012年第4期22卷 303-310页

作者： Chungseok Kim Automotive Engineering Hanyang UniversityHangdang-dongSeongdong-guSeoul133-791South Korea

The creep damage of Ni-based superalloy has been experimentally investigated by acoustic nonlinearity measured by the finite amplitude method. The creep test is conducted and interrupted after a specified fraction of creep life time. The cuboidal γ precipitates coarsen preferentially in the direction perpendicular to the applied stress axis. The aspect ratio (a/b) of the γ precipitate increases monotonously with creep duration. The increase in acoustic nonlinearity is discussed in relation to the directional coarsening of the γ precipitates, which proves to be closely related to the scattering and distortion of the ultrasonic waves. We have determined that acoustic nonlinearity is a potential diagnostic method for determining creep damage in Ni-based superalloys.

关键词： Acoustic nonlinearity Creep Superalloy Precipitate Diagnosis

Microstructural tailoring,mechanical and thermal properties of SiC composites fabricated by selective laser sintering and reactive melt infiltration

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Journal of Advanced Ceramics 2023年第4期12卷 830-847页

作者： Xiao Chen Jie Yin Longzhi Huang Sea-Hoon Lee Xuejan Liu Zhengren Huang State Key Lab of High Performance Ceramics and Superfine Microstructures Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Extreme Materials Institute Korea Institute of Materials ScienceChangwon 51508Republic of Korea

Poor flowability of printable powders and long preparation cycles are the main challenges in the selective laser sintering(SLS)of chopped carbon fiber(C_(f))reinforced silicon carbide(SiC)composites with complex *** this study,we develop an efficient and novel processing route in the fabrication of lightweight SiC composites via the SLS of phenolic resin(PR)and Cr powders with the addition of a-SiC particles combined with the one-step reactive melt infiltration(RMI).The effects of a-SiC addition on the microstructural evolution of the C_(f)/SiC/PR printed bodies,C_(f)/SiC/C green bodies,and derived SiC composites were *** results indicate that the added a-SiC particles play an important role in enhancing the flowability of raw powders,reducing the *** the reliability of the C/SiC/C green bodies,and contributing to improving the microstructure homogeneity and mechanical properties of the SiC *** maximum density,flexural strength,and fracture toughness(Kic)of the SiC composites are 2.749±0.006 g·cm^(3),266±5 MPa,and 3.30±0.06 MPa-m,*** coefficient of thermal expansion(CTE,a)of the SiC composites is approximately 4.29×10^(-6)K^(-1)from room temperature(RT)to 900℃,and the thermal conductivity(x)is in the range of 80.15-92.48 W·m^(-1)·K^(-1)at *** high-temperature strength of the SiC composites increase to 287±18 MPa up to 1200℃.This study provides a novel as well as feasible tactic for the preparation of high-quality printable powders as well as lightweight,high-strength,and high-x SiC composites with complex structures by the SLS and RMI.

关键词： chopped carbon fiber(C_(f)) microstructural tailoring selective laser sintering(SLS) mechanical properties thermal properties

Unlocking the future of optical security with metasurfaces

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Light(Science & Applications) 2021年第8期10卷 1398-1400页

作者： Jaehyuck Jang Trevon Badloe Junsuk Rho Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea P05C0-P0STECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea

The complex degrees of freedom of light,such as amplitude,phase,polarization,and orbital angular momentum,make it a prime candidate for use in optical security and *** exploiting the unique characteristics of metasurf... 详细信息

关键词： locking surfaces optical

Effects of displacement boundary conditions on thermal deformation in thermal stress problems

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China Foundry 2013年第3期10卷 187-194页

作者： S.Y.Kwak C.H.Lim J.H.Nam e-Design Center Korea Institute of Industrial Technology Department of Virtual Engineering University of Science and Technology

Most computational structural engineers are paying more attention to applying loads rather than to DBCs （Displacement Boundary Conditions） because most static stable mechanical structures are working under already prescribed displacement boundary conditions. In all of the computational analysis of solving a system of algebraic equations, such as FEM （Finite Element Method）, three translational and three rotational degrees of freedom （DOF） should be constrained （by applying DBCs） before solving the system of algebraic equation in order to prevent rigid body motions of the analysis results （singular problem）. However, it is very difficult for an inexperienced engineer or designer to apply proper DBCs in the case of thermal stress analysis where no prescribed DBCs or constraints exist, for example in water quenching for heat treatment. Moreover, improper DBCs cause incorrect solutions in thermal stress analysis, such as stress concentration or unreasonable deformation phases. To avoid these problems, we studied a technique which performs the thermal stress analysis without any DBCs; and then removes rigid body motions from the deformation results in a post process step as the need arises. The proposed technique makes it easy to apply DBCs and prevent the error caused by improper DBCs. We proved it was mathematically possible to solve a system of algebraic equations without a step of applying DBCs. We also compared the analysis results with those of a traditional procedure for real castings.

关键词： thermal stress analysis displacement boundary conditions rigid body motion singular problem

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Pseudoconformal equation of state in compact-star matter from topology change and hidden symmetries of QCD

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Science China(Physics,Mechanics & Astronomy) 2019年第11期62卷 87-92页

作者： Yong-Liang Ma Hyun Kyu Lee Won-Gi Paeng Mannque Rho Center for Theoretical Physics and College of Physics Jilin UniversityChangchun 130012China Department of Physics Hanyang UniversitySeoul 133-791Korea Rare Isotope Science Project Institute for Basic ScienceDaejeon 305-811Korea Institut de Physique Theorique CEA Saclay91191 Gif-sur-Yvette cedexFrance

We construct a new effective field theory approach to the equation of state(EoS), dubbed pseudo-confomal model 'PCM', for nuclear and compact star matter entirely in terms of effective hadron degrees of freedom. The possible transition at n ^(2-4)n0(where n0 is the normal nuclear matter density) from hadron degrees of freedom to strongly-coupled quark degrees of freedom,giving rise to a soft-to-hard changeover in the EoS that can accommodate the massive stars observed, is effectuated by the topology change at n1/2>~ 2n0 from skyrmions to half-skyrmions without involving local order-parameter fields. The mechanism exploits possible emergence of hidden scale and local symmetries of QCD at high density, leading to a precocious 'pseudo-conformal'sound velocity vs2= 1/3(in unit of c = 1) for n>~ 3n0. The resulting prediction signals a drastic departure from standard nuclear many-body theory in the density regime involved in the massive stars. We suggest that the tidal deformability implemented in gravitational waves coming from coalescing neutron stars in LIGO/Virgo-type observations could pin down the location of the topology change density n1/2.

关键词： equation of state compact star tidal deformability conformal sound velocity

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