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Effects of Microstructure of Aluminum Substrate on Ordered Nanopore Arrays in Anodic Alumina

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Journal of Materials Science & Technology 2015年第7期31卷 751-758页

作者： Choong-Soo Chi Jong-Ho lee Insoo Kim han-Jun Oh School of Advanced Materials Engineering Kookmin University Department of Chemistry Hanseo University Advanced Materials Science and Engineering Kumoh National Institute of Technology Department of Materials Science Hanseo University

The effects of microstructure of aluminum substrate on regular nanopore arrangement in anodic alumina layer were investigated. The dissimilar microstructure and texture on aluminum sheets were prepared by various cold rollings and heat treatments, and anodic alumina nanoporous layers were fabricated by two step anodizing method at 40 V in oxalic acid solution. For the aluminum sheets with similar surface texture and annealing condition except purity, the regularity of the nanopore arrangement on the anodic alumina layer increased with purity of aluminum substrate. The difference of surface texture on AI sheets is not critical parameter for formation of ordered nanopore array compared with purity and heat treatment of substrate aluminum. The investigation suggested that the purity and reasonable annealing temperature of aluminum substrate are very important process to obtain the highly-ordered nanopore array on anodic alumina layer.

关键词： AnodizationNanoporous structureTextureAluminum alloy

Fingerprint inspired advanced end-effector and its applications

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Friction 2022年第10期10卷 1739-1750页

作者： Sung Ho lee Hyo Sung KIM han Jun PARK Moon Kyu KWAK Department of Electrical Engineering and Computer Science University of MichiganAnn Arbor 48109USA Department of Mechanical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

The human fingertip consists of a fingerprint with many micro-grating *** main roles of the fingerprint could be divided into two purposes,namely,the enhancement of the frictional force and the effective transmittance of the *** this study,we present the fingerprint-inspired end-effector that has not only admirable frictional force but also electric *** end-effector is composed of fluorocarbon rubber,one of the famous materials to achieve high frictional force and *** various experiments,the novel performance of micro structured fluorocarbon rubber end-effector(MSFE)is characterized by comparing with a macroscale patterned sample(MPS),which has been already used in real industrial *** results are analyzed ***,as feasible applications,we suggest two applications based on the role of the *** is the conductive astronaut glove with high frictional force,and the other one is a non-slip pad for the next-generation glass transfer *** these experiments,we successfully observe the enhanced system performance and confirm the possibility of using the MSFE as feasible *** believe that the MSFE could be a useful and powerful alternative as an end-effector,not only in the aerospace industry but also in display manufacturing processes.

关键词： fingerprint end-effector fluorocarbon rubber(FKM) glass transfer system spacesuit

Lean individuals with nonalcoholic fatty liver disease,the chicken or the egg?

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Hepatobiliary Surgery and Nutrition 2024年第1期13卷 176-179页

作者： Eugene han Yong-ho lee Department of Internal Medicine Keimyung University School of MedicineDaeguKorea Department of Internal Medicine Yonsei University College of MedicineSeoulKorea Institute of Endocrine Research Yonsei University College of MedicineSeoulKorea

With the increasing obesity population,the prevalence of nonalcoholic fatty liver disease(NAFLD)has continuously grown in recent decades(1).It has recently been recognized that NAFLD can be presented in lean or non-obese *** subset of individuals,referred as“lean NAFLD”or“non-obese NAFLD”,accounts for approximately a quarter of entire NAFLD population(2).

关键词： Nonalcoholic fatty liver disease(NAFLD) body mass index(BMI) obesity sarcopenia muscle

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

A comparative study of totally laparoscopic distal gastrectomy versus laparoscopic-assisted distal gastrectomy in gastric cancer patients: Short-term operative outcomes at a high-volume center

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Chinese Journal of Cancer Research 2018年第5期30卷 537-545页

作者： Won Ho han Amir Ben Yehuda Deok-Hee Kim Seung Geun Yang Bang wool Eom Hong Man Yoon Young-Woo Kim Keun Won Ryu Center for Gastric Cancer National Cancer Center Department of Surgery Assaf Harofeh Medical Center

Objective： Laparoscopic gastrectomy has been established as a standard treatment for early gastric cancer, and its use is increasing recently. Compared with the conventional laparoscopy-assisted distal gastrectomy （LADG）, totally laparoscopic distal gastrectomy （TLDG） involves intracorporeal reconstruction, which can avoid the additional incision, resulting in pain reduction and early recovery. This study aimed to compare the short-term postoperative outcomes of TLDG vs. LADG in gastric cancer in a high-volume ***： A retrospective cohort study was conducted on 1,322 patients who underwent laparoscopic distal gastrectomy from June 2012 to June 2017 at the National Cancer Center, Korea. LAD G was performed in the early period before July 2015, and TLDG was applied in the later period. Postoperative short-term outcomes were compared in terms of complication and clinical course between the two groups. Pain score was measured by rating the pain intensity from 0 to 10 points on postoperative day （POD） 1 and 3. Results： A total of 667 patients underwent LADG and 655 patients underwent TLDG. Clinieopathologic characteristics were not different in both groups. Intraoperative estimated blood loss （EBL） was significantly lower in the TLDG group （P〈0.001）. Postoperative pain scores were significantly lower in the TLDG group than in the LADG group on POD 1 （5.1±1.5 vs. 4.8±1.4, P=0.015）. First flatus passage after operation was significantly earlier in the TLDG group （3.4±0.8 d vs. 3.2±0.6 d, P〈0.001）. There were no differences in postoperative complications and hospital stay between the two groups. Conclusions： Based on the reported short-term postoperative outcomes, TLDG is safe and feasible as well as LADG. Moreover, compared with LADG, TLDG can reduce intraoperative EBL and postoperative pain and enhance the bowel motility in gastric cancer surgery.

关键词： Distal gastrectomy gastric cancer intracorporeal anastomosis laparoscopic surgery

Effects of mother-child interaction on school adaptation of children according to maternal depression

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Frontiers of Nursing 2021年第1期8卷 33-42页

作者： hanna lee Jeong-Won han Department of Nursing Gangneung-Wonju National UniversityGangwon-do 26403Korea College of Nursing Science Kyunghee UniversitySeoul 1240Kore

Objective:Factors influencing school adaptation of school-aged children include both executive function(EF)and parent–child *** study aims to investigate the developmental trajectory of mother–child interaction longitudinally using latent growth model ***:A longitudinal descriptive survey study was *** par ticipants comprised of 1,614 mothers and school-aged children,who participated in the Panel Study on Korean Children(6 th–8 th panel surveys).A model was designed and analyzed using latent growth modeling to estimate the pattern of change over ***:In the group where the maternal depression was within the normal range,only the path by which the change rate of mother–child interaction affected school adaptation of children was statistically nonsignificant(t=1.007,p=0.314).In the group where maternal depression was mild or higher,only the paths by which the initial value of mother–child interaction affected EF difficulty(t=-2.75,p=0.032)and EF difficulty affected school adaptation(t=-7.876,p<0.001)were statistically ***:This study confirms the research models developed by dividing mother–child interaction into two groups according to depression levels(i.e.,normal range and mild or higher-level depression).The findings provide a basis for construction of individualized interventions.

关键词： child depression interactions school

Compact magneto-optical traps using planar optics

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Chinese Physics B 2024年第9期33卷 93-108页

作者： Zhi Tan Bo Lu Chengyin han Chaohong lee Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous IntegrationCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen 518045China

Magneto-optical traps (MOTs) composed of magnetic fields and light fields have been widely utilized to cool andconfine microscopic particles. Practical technology applications require miniaturized MOTs. The advancement of planaroptics has promoted the development of compact MOTs. In this article, we review the development of compact MOTs basedon planar optics. First, we introduce the standardMOTs. We then introduce the gratingMOTs with micron structures, whichhave been used to build cold atomic clocks, cold atomic interferometers, and ultra-cold sources. Further, we introducethe integrated MOTs based on nano-scale metasurfaces. These new compact MOTs greatly reduce volume and powerconsumption, and provide new opportunities for fundamental research and practical applications.

关键词： magneto-optical trap (MOT) planar optics grating MOT metasurface MOT

Mutation of Oryza sativa CORONATINE INSENSITIVE 1b(OsCOI1b) delays leaf senescence

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Journal of Integrative Plant Biology 2015年第6期57卷 562-576页

作者： Sang-Hwa lee Yasuhito Sakuraba Taeyoung lee Kyu-Won Kim Gynheung An han Yong lee Nam-Chon Paek Department of Plant Science Plant Genomics and Breeding InstituteResearch Institute of Agriculture and Life SciencesSeoul National University Interdisciplinary Program in Bioinformatics Seoul National University Department of Plant Molecular Systems Biotechnology Crop Biotech InstituteKyung Hee University Department of Agricultural Biotechnology Seoul National University

Jasmonic acid （JA） functions in plant development, including senescence and immunity. Arabidopsis thaliana CORONATINE INSENSITIVE 1 encodes a JA receptor and functions in the JA‐responsive signaling pathway. The Arabidopsis genome harbors a single COI gene, but the rice （Oryza sativa） genome harbors three COI homologs, OsCOI1a, OsCOI1b, and OsCOI2. Thus, it remains unclear whether each OsCOI has distinct, additive, synergistic, or redundant func-tions in development. Here, we use the oscoi1b‐1 knockout mutants to show that OsCOI1b mainly affects leaf senescence under senescence‐promoting conditions. oscoi1b‐1 mutants stayed green during dark‐induced and natural senescence, with substantial retention of chlorophylls and photosyn-thetic capacity. Furthermore, several senescence‐associated genes were downregulated in oscoi1b‐1 mutants, including homologs of Arabidopsis thaliana ETHYLENE INSENSITIVE 3 and ORESARA 1, important regulators of leaf senescence. These results suggest that crosstalk between JA signaling and ethylene signaling affects leaf senescence. The Arabidopsis coi1‐1 plants containing 35S：OsCOI1a or 35S：OsCOI1b rescued the delayed leaf senescence during dark incubation, sug-gesting that both OsCOI1a and OsCOI1b are required for promoting leaf senescence in rice. oscoi1b‐1 mutants showed significant decreases in spikelet fertility and grain weight, leading to severe reduction of grain yield, indicating that OsCOI1‐mediated JA signaling affects spikelet fertility and grain filling.

关键词： Jasmonic acid leaf senescence OsCOI1b rice stay-green

Relationship between decreased visual acuity and physical activity time in school age children

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Frontiers of Nursing 2021年第2期8卷 113-120页

作者： hanna lee Jeong-Won han Department of Nursing Gangneung-Wonju National UniversityGangwon-do 25457Korea College of Nursing Science Kyung Hee UniversityKyunghee-daeroDongdaemun-guSeoul 02453Korea

Objective:This study aimed to investigate the physical activity of children with decreased visual acuity,thereby providing basic data for developing strategies to enhance the physical activity of school-age ***:The participants were 1,194 children and 1,194 parents who participated in the 10th Korean Children Panel *** regression analysis was conducted to examine the status of the physical activity of children with decreased visual acuity according to the accessibility of community ***:The mother perceived the accessibility of community facilities as low,children with decreased visual acuity reported 1.20 times shorter over-the-weekend leisure activity time compared with vision-typical children,and they spent 1.41 and 1.33 times shorter on caring for pets and religious activity,***:To increase the physical activity of children with decreased visual acuity,family-oriented interventions should be *** is also important to establish a community environment with enhanced accessibility of community facilities by examining the level of accessibility perceived by parents.

关键词： activity child community physical school