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Asian Herpetological Research 2012年第2期3卷 133-140页

作者： Il-Hun KIM nam-yong ra Daesik PARK Department of Biology Kangwon National University Division of Science Education Kangwon National University

Information on habitat use is critical in sizing protected areas for endangered reptile species. To investigate habitat use, home range, and hibernaculum of the endangered Mongolian racerunner(Eremias argus), we radio-tracked 40 specimens in a coastal sand dune in South Korea. Of the 163 locations recorded during the breeding season, 150(92.0%) were in grass sand dunes, and the rest(8.0%), all associated with the same lizard, were in shrub sand dunes. All of the 123 locations recorded during the non-breeding season were in grass sand dunes. No lizards were found in the grasslands abutting the dunes. The four lizards with identifiable hibernation sites were found under an average of 17.8 cm of sand and were all located in grass sand dunes. The lizards moved approximately 5 m daily and used 162 m2of home range(computed by minimum convex polygon, MCP) during the breeding season, and they moved approximately 2 m and used 68 m2of home range during the non-breeding season. However, the mean daily moved distances and MCP home ranges were not statistically significantly different between the seasons or between males and females. Our results suggest that in coastal sand dunes, E. argus uses grass sand dunes as its main habitat throughout the year. This finding could be used to determine the appropriate habitat size and to designate for the conservation of this endangered species.

关键词： coastal sand dune spatial ecology Eremias argus lizard radio-telemetry

Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun Lee yong nam Ahn Seongjoon So Chanwoo Park Jong-Seong Bae Taehyun Park Il Tae Kim Jaehyun Hur School of Chemical Biological and Battery Engineering Gachon University Seongnam Busan Center Korea Basic Science Institute

Aqueous Zn-ion batteries （AZIBs） have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction （HER） from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO3（CTO） protective layer on Zn（CTO@Zn） as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant （εr=180） and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn2+ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and HER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential （～68 m V） for 1500 h at 1 mA cm-2/0.5 mA h cm-2,excelling bare ***,when paired with the V2O5-C cathode,the CTO@Zn//V2O5-C full battery delivers 148.4 mA h g-1（based on the mass of the cathode） after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： Artificial layer Dielectric constant Zn metal anode Zinc aqueous battery

SUPPRESSION OF DEFECTIVE DATA ARTIFACTS FOR DEBLURRING IMAGES CORRUPTED BY raNDOM VALUED NOISE

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Journal of Computational Mathematics 2015年第3期33卷 263-282页

作者： nam-yong Lee Department of Applied Mathematics Inje University Gimhae Gyeongnam 621-749 Korea

For deblurring images corrupted by random valued noise, two-phase methods first select likely-to-be reliables （data that are not corrupted by random valued noise） and then deblur images only with selected data. Two-phase methods, however, often cause defective data artifacts, which are mixed results of missing data artifacts caused by the lack of data and noisy data artifacts caused mainly by falsely selected outliers （data that are corrupted by random valued noise）. In this paper, to suppress these defective data artifacts, we propose a blurring model based reliable-selection technique to select reliables as many as possible to make all of to-be-recovered pixel values to contribute to selected data, while excluding outliers as accurately as possible. We also propose a normalization technique to compensate for non-uniform rates in recovering pixel values. We conducted simulation studies on Gaussian and diagonal deblurring to evaluate the performance of proposed techniques. Simulation results showed that proposed techniques improved the performance of two-phase methods, by suppressing defective data artifacts effectively.

关键词： Missing data artifacts Normalization Two-phase methods.

Evaluation of Pencil Lead Based Electrodes for Electrocardiogram Monitoring in Hot Spring

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Computers, Materials & Continua 2021年第2期66卷 1411-1425页

作者： ratha Yeu namhui ra Seong-A Lee Yunyoung nam Department of ICT Convergence Rehabilitation Engineering Soonchunhyang UniversityAsan31538Korea Department of ICT Convergence Soonchunhyang UniversityAsan31538Korea Department of Occupational Therapy Soonchunhyang UniversityAsan31538Korea Department of Computer Science and Engineering Soonchunhyang UniversityAsan31538Korea

Electrocardiogram(ECG)electrodes are conductive pads applied to the skin to measure cardiac ***/AgCl electrodes are the commercial product which widely used to obtain *** monitoring the ECG in a hot spring,Ag/AgCl electrodes must be waterproofed;however,this is time-consuming,and the adhesive may tear the skin on *** solving the problem,we developed the carbon pencil lead(CPL)electrodes for use in hot *** CPL and Ag/AgCl electrodes were connected to ECG100C’s *** Performance was evaluated in three conditions as following:hot spring water with and without bubble,and in cold *** each environment,the procedure was followed by three different protocols that are recording from the dry condition,hot spring water immersion with and without movement,post hot spring water *** dry and wet conditions,both electrodes can obtain the waveform of the ECG signal in which all PQRST waves were ***,the signal quality of both types of electrodes was different in water immersion with and without *** overall morphology obtained by Ag/AgCl electrodes was unstable higher than that of CPL electrodes in immersion without movement *** CPL electrodes provided better ECG waveform quality compared to Ag/AgCl electrodes in which the ECG signal had high waveforms distortion in water immersion with movement condition.

关键词： Carbon pencil lea ECG electrodes ECG monitoring hot spring water cold water hot spring water bubble

Circadian fluctuations in three types of sensory modules in healthy subjects

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Neural Regeneration Research 2014年第4期9卷 436-439页

作者： yong Hyun Kwon Ki Seok nam Department of Physical Therapy Yeungnam University College of Science and TechnologyHyunchung-roNam-guDaeguRepublic of Korea

This study was designed to observe and compare the circadian fluctuations in tactile sense, joint reposition sense and two-point discrimination in healthy subjects. Twenty-one healthy adult subjects received perceptual ability tests through these three different sensory modules at approximately 9：00, 13：00 and 18：00 in a day. The distribution of ranking for perceptual ability was significantly different among the three different time points in each individual, with highest perceptual ability in the evening compared with noon and morning, in terms of tactile sense and two-point discrimination. These findings suggest that the perceptual ability of healthy subjects fluctuates according to the time points in a day.

关键词： nerve regeneration circadian pattern biological rhythm circadian fluctuations perceptual ability tactile sensory joint reposition sense two-point discrimination Basic Science ResearchProgram through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology neural regeneration

Multiaxially-stretchable kirigami-patterned mesh design for graphene sensor devices

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Nano Research 2020年第5期13卷 1406-1412页

作者： Hyo Chan Lee Ezekiel YHsieh Keong yong SungWoo nam Department of Mechanical Science and Engineering University of Illinois at Urbana–ChampaignUrbanaIllinois 61801USA Department of Materials Science and Engineering University of Illinois at Urbana–ChampaignUrbanaIllinois 61801USA Materials Research Laboratory University of Illinois at Urbana–ChampaignUrbanaIllinois 61801USA Micro and Nanotechnology Laboratory University of Illinois at Urbana–ChampaignUrbanaIllinois 61801USA Carle Illinois College of Medicine University of Illinois at Urbana–ChampaignChampaignIllinois 61820USA

In wearable electronics,significant research has gone into imparting stretchability and flexibility to otherwise rigid electronic components while maintaining their electrical *** far,this has been achieved through various geometric modifications of the rigid conductive components themselves,such as with microcracked,buckled,or planar meander ***,strategic placement of these resulting components within the overall devices,such as embedding them at the neutral plane,has been found to further enhance mechanical stability under ***,these strategies are still limited in performance,failing to achieve fully strain-insensitive electrical performance under biaxial stretching,twisting,and mixed strain ***,we developed a new platform for wearable,motion artifact-free sensors using a graphene-based multiaxially stretchable kirigami-patterned mesh *** normalized resistance change of the electrodes and graphene embedded in the structure is smaller than 0.5%and 0.23%under 180°torsion and 100%biaxial strain,***,the resistance change is limited to 5%under repeated stretching-releasing cycles from 0%to 100%biaxial *** addition,we investigated the deformation mechanisms of the structure with finite element *** on the simulation results,we derived a dimensionless geometric parameter that enables prediction of stretchability of the structure with high ***,as a proof-of-concept,we demonstrated a biaxially-stretchable graphene-based sensor array capable of monitoring of temperature and glucose level with minimized motion-artifacts.

关键词： kirigami mesh strain-insensitive wearable graphene glucose

Direct dynamic-simulation approach to trajectory optimization

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Chinese Journal of Aeronautics 2021年第10期34卷 6-19页

作者： Sung Wook HUR Seong Han LEE yong Hyeon nam Chang-Joo KIM Department of Aerospace Information Engineering Konkuk UniversitySeoul 05029Republic of Korea

This paper proposes a new direct method for an efficient trajectory optimization using the point that the dynamics of a deterministic system are uniquely determined by initial states and controls imposed over the time horizon of *** effectively implement this concept,the Hermite spline is adopted to interpolate the continuous controls and the system dynamics are integrated with corresponding control parameters in *** a result,the optimal control problem can be transcribed into a nonlinear programming problem which has no dynamic equality constraints and no intermediate states in its design *** addition,the paper proposes an efficient recursive Jacobian estimation technique and introduces a Jacobian transformation matrix to straightforwardly handle the general state *** properties of the present method are thoroughly investigated through its applications to the trajectory optimization for a soft lunar landing from a parking orbit,including the detailed analyses for the de-orbiting *** computed results are compared with those using the pseudo-spectral method to demonstrate an extreme outperformance of the proposed method in the aerospace applications over the traditional direct method.

关键词： Trajectory optimization Direct method Hermite spline interpolation Pseudo-spectral integrator Soft lunar landing

Extended X-ray absorption fine structure (EXAFS) of FAPbI_(3) for understanding local structure-stability relation in perovskite solar cells

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Journal of Energy Chemistry 2022年第4期31卷 549-554页

作者： Dong-Ho Kang yong-Jun Park Yun-Sung Jeon nam-Gyu Park School of Chemical Engineering and Center for Antibonding Regulated Crystals Sungkyunkwan UniversitySuwon 16419Korea

Perovskite solar cells (PSCs) employing formamidinium lead iodide (FAPbI_(3)) have shown high ***,operational stability has been issued due to phase instability of α phase FAPbI_(3) at ambient *** precursors in the perovskite precursor solution has been proposed to improve not only power conversion efficiency (PCE) but also device ***,there is a controversial issue on the beneficial effect on PCE and/or stability between excess FAI and excess PbI_(2).We report here extended X-ray absorption fine structure (EXAFS) of FAPbI_(3) to study local structural change and explain the effect of excess precursors on photovoltaic performance and *** films prepared from the precursor solution with excess PbI_(2)shows better stability than those from the one with excess FAI,despite similar PCE.A rapid phase transition from α phase to non-perovskite δ phase is observed from the perovskite film formed by excess ***,the (Pb-I) bond distance evaluated by the Pb L_(III)-edge EXAFS study is increased by excess FAI,which is responsible for the phase transition and poor device *** work can provide important insight into local structure-stability relation in the FAPbI_(3)-based PSCs.

关键词： Extended X-ray absorption fine structure EXAFS Excess precursor Local structure Stability Perovskite solar cells

Sexual dimorphism and sex-differential migration of Little Buntings(Emberiza pusilla)at an East Asian stopover site

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Avian Research 2022年第1期13卷 87-93页

作者： Sook-Young Cho Hyun-Young nam Se-Young Park Chang-yong Choi Bird Research Center Korea National Park Research InstituteJeonnam58863Republic of Korea Division of Zoology Honam National Institute of Biological ResourcesMokpo58762Republic of Korea School of Biological Sciences College of Natural SciencesSeoul National UniversitySeoul08826Republic of Korea Department of Agriculture Forestry and BioresourcesCollege of Agriculture and Life SciencesSeoul National UniversitySeoul08826Republic of Korea

Sex differences in morphology provide key information for understanding a species'morphological adaptations in relation to the evolution of sexual *** migratory birds,morphological traits have adapted to long-distance travel,and sexual dimorphism is typically related to sex-differential migration *** Buntings(Emberiza pusilla)have one of the longest migrations and are the least dichromatic species among the Emberiza *** this study,we measured sexual size dimorphism and sexual dichromatism of Little Buntings in relation to the spring arrival dates at a stopover site in *** length was the most important predictor for identifying sex;the wings of males were longer than those of *** also had a significantly stronger chestnut color of the head feathers than females,but this color difference was more prominent in the spring than in the *** arrived earlier than females by four *** dates correlated with both size and color,but unlike other bunting species previously studied in the same area,there was no clear sex-differential trend in the relationship between arrival date and morphological *** differences in the degree of sexual dichromatism suggest that chestnut plumage coloration can be used as a social or sexual signal of males in the breeding *** correlation of size and color to early arrival regardless of sex may indicate that a preference for assortative mating exists or that a sex-differential migration strategy is not clearly defined in the early stages of northward *** findings on the sexual dimorphism of Little Buntings provide insight into the evolution of the sex-differential migration of buntings in the East Asian Flyway.

关键词： Digital photography Emberiza pusilla Little Bunting Protandrous migration Sexual dichromatism Sexual dimorphism

On extensions of matrix rings with skew Hochschild 2-cocycles

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Frontiers of Mathematics in China 2016年第4期11卷 869-900页

作者： Chan yong HONG nam Kyun KIM Tai Keun KWAK Yang LEE Department of Mathematics and Research Institute for Basic Sciences Kyung Hee University Seoul 02447 Korea School of Basic Sciences Hanbat National University Daejeon 34158 Korea Department of Mathematics Daejin University Pocheon 11159 Korea Department of Mathematics Pusan National University Pusan 46241 Korea

We study structures of endomorphisms and introduce a skew Hochschild 2-cocycles related to Hochschild 2-cocycle. We moreover define skew Hochschild extensions equipped with skew Hochschild 2-cocycles, and then we examine uniquely clean, Abelian, directly finite, symmetric, and reversible ring properties of skew Hochschild extensions and related ring systems. The results obtained here provide various kinds of examples of such rings. Especially, we give an answer negatively to the question of H. Lin and C. Xi for the corresponding Hochschild extensions of reversible （or semicommutative） rings. Finally, we establish three kinds of Hochschild extensions with Hochschild 2-cocycles and skew Hochschild 2-cocycles.

关键词： Skew Hochschild extensions matrix rings skew triangular matrix rings (uniquely) clean rings symmetric rings