检索结果-南通市图书馆

npj Computational Materials 2023年第1期9卷 2066-2073页

作者： Panithan Sriboriboon Huimin Qiao Owoong Kwon Rama K.Vasudevan Stephen Jesse Yunseok kim School of Advanced Materials and Engineering Sungkyunkwan University(SKKU)SuwonRepublic of Korea Research Center for Advanced Materials Technology Core Research InstituteSuwonRepublic of Korea Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTNUSA

Hafnium oxide-based ferroelectrics have been extensively studied because of their existing ferroelectricity,even in ultra-thin film ***,studying the weak response from ultra-thin film requires improved measurement *** general,resonance-enhanced piezoresponse force microscopy(PFM)has been used to characterize ferroelectricity by fitting a simple harmonic oscillation model with the resonance ***,an iterative approach,such as traditional least squares(ls)fitting,is sensitive to noise and can result in the misunderstanding of weak *** this study,we developed the deep neural network(DNN)hybrid with deep denoising autoencoder(DDA)and principal component analysis(PCA)to extract resonance *** DDA/PCA-DNN improves the PFM sensitivity down to 0.3 pm,allowing measurement of weak piezoresponse with low excitation voltage in 10-nm-thick Hf_(0.5)Zr_(0.5)O_(2) thin *** hybrid approaches could provide more chances to explore the low piezoresponse of the ultra-thin ferroelectrics and could be applied to other microscopic techniques.

关键词： spectrum ferroelectric excitation

Optimal Center-of-Mass Pivot Effect of Spinal Motion in Feline Galloping

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第5期17卷 970-977页

作者： Young Kook kim Dongwon Yun LV R&D team Electro-technology R&D CenterLS ELECTRIC Co.LtdCheongju 28437South Korea Department of Robotics Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988South Korea

In this paper,we studied the acceleration behavior of a quadruped animal during a galloping *** the development of many quadruped robotic systems has been focused on dynamic movements,it is obvious that guidance from the dynamic behavior of quadruped animals is needed for robotics *** fulfill this demand,this paper deals with analysis of the galloping motions of a domestic cat,which is well known for its excellent acceleration performance among four-legged *** on the planar motion capture environment,the movement data of a galloping feline was acquired and the dynamic motions were estimated using a spring-mass *** particular,the effects of the position and angle of the center-of-mass of the cat,angular displacement of the spine,and angular velocity of the spine were analyzed and are discussed *** this process,it was possible to understand the dynamic movement characteristics of the cat,and to understand the relationships between,and the influences of,these *** this analysis,we provide significant data applicable to the design of joint movements in quadruped robot systems.

关键词： quadrupedalism feline galloping domestic cat center-of-mass

Biomimetic Quadruped Robot with a Spinal Joint and Optimal Spinal Motion via Reinforcement Learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2021年第6期18卷 1280-1290页

作者： Young Kook kim Woojin Seol Jihyuk Park LV R&D Team Electro-technology R&D CenterLS Electric Co.LtdCheongju28437Republic of Korea Digital Innovation Unit Korea Hydro&Nuclear Power Co.Ltd1312-gil YuseongdaeroYusung-guDaejeon34101Republic of Korea Department of Automotive Engineering College of Mechanical and IT EngineeringYeungnam University280 Daehak-roGyeongsanGyeongbuk38541Republic of Korea

Feline animals can run quickly using spinal joints as well as the joints that make up their four *** paper describes the development of a quadruped robot including a spinal joint that biomimics feline *** developed robot platform consists of four legs with a double 4-bar linkage type and one simplified rotary *** addition,Q-learning,a type of machine learning,was used to find the optimal motion profile of the spinal *** bounding gait was implemented on the robot system using the motion profile of the spinal joint,and it was confirmed that using the spinal joint can achieve a faster Center of Mass(CoM)forward speed than not using the spinal *** the motion profile obtained through Q-learning did not exactly match the spinal angle of a feline animal,which is more multiarticular than that of the developed robot,the tendency of the actual feline animal spinal motion profile,which is sinusoidal,was similar.

关键词： Quadruped robot system Bioinspired methods Legged robots Machine learning Q-learning

Secondary Cell Wall Deposition in Developing Secondary Xylem of Poplar

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2010年第2期52卷 234-243页

作者： Minako Kaneda kim Rensing Lacey Samuels Department of Botany University of British ColumbiaVancouverBritish Columbia V6T 1Z4Canada Leica Microsystems BannockburnIllinoisUSA

Although poplar is widely used for genomic and biotechnological manipulations of wood, the cellular basis of wood development in poplar has not been accurately documented at an ultrastructural level. Developing secondary xylem cells from hybrid poplar （Populus deltoides x P. trichocarpa）, which were actively making secondary cell walls, were preserved with high pressure freezing/freeze substitution for light and electron microscopy. The distribution of xylans and mannans in the different cell types of developing secondary xylem were detected with immunofluorescence and immuno-gold labeling. While xylans, detected with the monoclonal antibody LM10, had a general distribution across the secondary xylem, mannans were enriched in the S2 secondary cell wall layer of fibers. To observe the cellular structures associated with secondary wall production, cryofixed fibers were examined with transmission electron microscopy during differentiation. There were abundant cortical microtubules and endomembrane activity in cells during the intense phase of secondary cell wall synthesis. Microtubuleassociated small membrane compartments were commonly observed, as well as Golgi and secretory vesicles fusing with the plasma membrane.

关键词： cell Secondary Cell Wall Deposition in Developing Secondary Xylem of Poplar

Predicting thermal conductivity of liquid suspensions of nanoparticles (nanofluids) based on rheology

在线全文

学校读者我要写书评

暂无评论

Particuology 2009年第2期7卷 151-157页

作者： Haisheng Chen Sanjeeva Witharanaa Yi Jin Chongyoup kim Yulong Ding Institute of Particle Science andEngineering University of Leeds Leeds LS2 9JT UK Institute of Engineering Thermophysics Chinese Academy of Science Beijing 100190 China Institute of Environmental Engineering University of Science and Technology Beijing 100083 China Department of Chemical and Biological Engineering Korea University Seoul Republic of Korea

A methodology is proposed for predicting the effective thermal conductivity of dilute suspensions of nanoparticles （nanofluids） based on rheology. The methodology uses the rheological data to infer microstructures of nanoparticles quantitatively, which is then incorporated into the conventional Hamilton-Crosser equation to predict the effective thermal conductivity of nanofluids. The methodology is experimentally validated using four types of nanofluids made of titania nanoparticles and titanate nanotubes dispersed in water and ethylene glycol. And the modified Hamilton-Zrosser equation successfully predicted the effective thermal conductivity of the nanofluids.

关键词： Nanofluids Thermal conductivity Rheology Viscosity Microstructure

Comparison and Analysis of QTls, Epistatic Effects and QTLx Environment Interactions for Yield Traits Using DH and RIls Populations in Rice

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第2期12卷 198-208页

作者： ZHAO Xin-hua QIN Yang JIA Bao-yan Suk-Man kim Hyun-Suk Lee Moo-Young Eun Kyung-Min kim Jae-Keun Sohn Department of Agronomy Shenyang Agricultural University School of Applied Biosciences College of Agriculture & Life Science Kyungpook National University Bio Safety Division Department of Agricultural Biotechnology National Academy of Agricultural Sciences Rural Development Administration C/O IRRI-Korea office National Institute of Crop Science Rural Development Administration

Two genetic linkage maps, constructed by DH and RIls populations derived from the same parents, were carried out for the identification and comparison of QTls controlling yield traits across different years in rice （Oryza sativa L.）. A total of 194 SSR and STS markers were used in two maps, of which 114 markers were same. The distribution of Samgang allele was higher in RIls population than it in DH population. Comparing with DH population, RIls population has more lines with higher yield and wider phenotypic transgressive segression for yield traits. Although most of QTls for the same trait were different in two populations across different years, 8 QTls （including gwp 11.1, spp5.1, spp 10.1, spp 11.2, ssrl. 1, ssrl 1.1, tgw9.1 and tgwl 1.1） were detected over 2 yr. It is important to note that pppl0.1, sppl0.1 and tgw9.1 were identified in two populations, while sppl 0.1 and tgw9.1 were simultaneity observed across different years. Epistatic effects were more important than additive effects for PPP, SPP, yield in DH population and TGW, yield in R/ls population. Epistatic effects of DH and RIls populations were different on the same genetic background in the present study, which illuminated the QE interaction played an important role on epistatic effect. Identification and comparison of QTls for yield traits in DH and RIls populations should provide various and more precise information. The QTls identified in present study would be valuable in marker-assisted selection program for improving rice yield.

关键词： RIls epistics effect QE interaction yield

Development of large acceptance multi-purpose spectrometer in Korea for symmetry energy

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2018年第12期29卷 6-14页

作者： Byungsik Hong Jung Keun Ahn Gyeonghwan Bak Jamin Jo Minho kim Eun Joo kim Young Jin kim Young Jun kim Minjung Kweon Hanseul Lee Hyo Sang Lee Jong-Won Lee Jung Woo Lee Kyong Sei Lee Byul Moon Dong Ho Moon Benard Mulilo Jaebeom Park Min Sang Ryu Hyunha Shim LAMPS Collaboration Department of Physics Korea University Seoul 02841Republic of Korea Department of Physics Chonnam National UniversityGwangju 61186 Republic of Korea Division of Science Education Chonbuk National UniversityJeonju 54896 Republic of Korea Rare Isotope Science Project Institute for Basic ScienceDaejeon 34047 Republic of Korea Department of Physics Inha University Incheon 22212Republic of Korea

The Rare Isotope Accelerator complex for ONline experiments(RAON) is a new radioactive ion beam accelerator facility under construction in Korea. The large acceptance multi-purpose spectrometer(LAMPS) is one of the experimental devices for nuclear physics at RAON. It focuses on the nuclear symmetry energy at supra-saturation densities. The LAMPS Collaboration has developed and constructed various detector elements, including a time projection chamber(TPC) and a forward neutron detector array. From the positron beam test, the drift velocity of the secondary electrons in the TPC is 5:3±0:2 cm/ls with P10 gas mixture, and the position resolution for pads with dimensions of 4×15 mm^2 is in the range of$ 0.6–0.8 mm, depending on the beam position. From the neutron beam test, the energy resolution of the prototype neutron detector module is determined to be 3.4%, and theposition resolution is estimated to be better than 5.28 *** present, the construction of the LAMPS neutron detector system is in progress.

关键词：分光计精力用途朝鲜对称开发核物理学合作发展

Dual cycloid gear mechanism for automobile safety pretensioners

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2012年第2期19卷 365-373页

作者： SHIN Joong-ho kim Chang-hyun YUN Pyeong-hwa KWON Soon-man Department of Mechanical Design and Manufacturing Changwon National University

The most conventional vehicle pretensioner system consists of an internal gear pair with involute teeth. However, it has been well known that the corresponding gear pairs are relatively weak under the situation of impact loadings. To improve this phenomenon, a new pretensioning gear system with cycloid teeth rather than the involute ones was proposed, and dual cycloidal gear mechanisms were designed for satisfying geometric constraints and dynamic loading conditions. The simulations of the prototypes were conducted by ls-DYNA program and the experiments for a prototype were performed for a dynamic model with impact loading devices. The results show that the better operation and the smoother motion are confirmed in the proposed cycloidal gear system rather than the conventional one without interferences between gear teeth under the impact of a crash.

关键词： seat belt pretensioner internal gear pairs involute gear dual cycloid gear

Speed vernalization to accelerate generation advance in winter cereal crops

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2022年第8期15卷 1300-1309页

作者： Jin-Kyung Cha Kathryn O'Connor Samir Alahmad Jong-Hee Lee Eric Dinglasan Hyeonjin Park So-Myeong Lee Dominique Hirsz Soon-Wook Kwon Youngho Kwon Kyeong-Min kim Jong-Min Ko Lee T.Hickey Dongjin Shin Laura E.Dixon National Institute of Crop Science RDAMiryang 50424Korea School of Biology Faculty of Biological SciencesUniversity of LeedsLeeds LS29JTUK Queensland Alliance for Agriculture and Food Innovation The University of QueenslandSt.LuciaQLDAustralia Department of Plant Bioscience Pusan National UniversityMiryang 60463Korea

There are many challenges facing the development of high-yielding,nutritious crops for future *** limiting factor is generation time,which prolongs research and plant breeding *** advances in speed breeding protocols have dramatically reduced generation time for many short-day and long-day species by optimizing lightand temperature conditions during plant ***,winter crops with a vernalization requirement stillrequire upto 6-10weeks in low-temperature conditions before thetransition to ***,we tested a suite of environmental conditions and protocols to investigate whether the vernalization process can be *** identified a vernalization method consisting of exposing seeds at the soil surface to an extended photoperiod of 22 h day:2 h night at 10°C with transfer to speed breeding conditions that dramatically reduces generation time in both winter wheat(Triticum aestivum)and winter barley(Hordeum vulgare).Implementation of the speedvernalization protocolfollowed byspeedbreedingallowed the completion ofuptofivegenerations per yearforwinter wheat or barley,whereas only two generations can be typically completed under standard vernalization and plant growth *** speed vernalization protocol developed in this study has great potential to accelerate biological research and breeding outcomes for winter crops.

关键词： speed breeding photoperiod temperature wheat barley breeding