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ECNU Review of Education 2024年第1期7卷 12-41页

作者： sang hoon bae Kee Ho Choi Sungkyunkwan University Seoul National University

Purpose:In Korea,private tutoring is considered a social evil that damages the capacity of public schooling and undermines social *** the government has implemented various policies to reduce private tutoring,ranging from improving the quality of education to providing"quasi-private tutoring"programs and regulating the shadow education market,total spending on private tutoring has continued to *** study examines a little noticed but important cause of institutionalized private tutoring in ***/Approach/Methods:The study employed a socio-ecological perspective to analyze both education and socio-structural *** extensive review of the government's private tutoring reduction policies and related literature was ***:Private tutoring functions as a means by which parents can help their children compete for admission to prestigious universities and pass on wealth and social status to their *** in private tutoring has become a social norm that is taken for *** root causes of institutionalized private tutoring lie in both educational and socio-structural ***/Nalue:The study suggests that government policies,when ignoring the long-established"grammar"of parents about children's education,may either end in failure or produce unintended consequences.

关键词： Private tutoring social reproduction unintended consequences upward mobility

Uncovering material deformations via machine learning combined with four-dimensional scanning transmission electron microscopy

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npj Computational Materials 2022年第1期8卷 1072-1080页

作者： Chuqiao Shi Michael C.Cao Sarah M.Rehn sang-hoon bae Jeehwan Kim Matthew RJones David A.Muller Yimo Han Department of Materials Science and NanoEngineering Rice UniversityHoustonTXUSA School of Applied and Engineering Physics Cornell UniversityIthacaNYUSA Department of Chemistry Rice UniversityHoustonTXUSA Department of Mechanical Engineering and Materials Science Washington University in Saint LouisSaint LouisMOUSA Institute of Materials Science and Engineering Washington University in Saint LouisSaint LouisMOUSA Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMAUSA Kavli Institute for Nanoscale Science Cornell UniversityIthacaNYUSA

Understanding lattice deformations is crucial in determining the properties of nanomaterials,which can become more prominent in future applications ranging from energy harvesting to electronic ***,it remains challenging to reveal unexpected deformations that crucially affect material properties across a large sample ***,we demonstrate a rapid and semi-automated unsupervised machine learning approach to uncover lattice deformations in *** method utilizes divisive hierarchical clustering to automatically unveil multi-scale deformations in the entire sample flake from the diffraction data using four-dimensional scanning transmission electron microscopy(4D-STEM).Our approach overcomes the current barriers of large 4D data analysis without a priori knowledge of the *** this purely data-driven analysis,we have uncovered different types of material deformations,such as strain,lattice distortion,bending contour,etc.,which can significantly impact the band structure and subsequent performance of nanomaterials-based *** envision that this data-driven procedure will provide insight into materials’intrinsic structures and accelerate the discovery of materials.

关键词： utilize purely overcome

Self-supported VO_(2)on polydopamine-derived pyroprotein-based fibers for ultrastable and flexible aqueous zinc-ion batteries

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Carbon Energy 2024年第7期6卷 1-13页

作者： Jeong Seok Yeon Sul Ki Park Shinik Kim Santosh VMohite Won Il Kim Gun Jang Hyun-Seok Jang Jiyoung bae sang Moon Lee Won GHong Byung hoon Kim Yeonho Kim Ho Seok Park School of Chemical Engineering College of EngineeringSungkyunkwan UniversityGyeonggi-doRepublic of Korea Department of Engineering University of CambridgeCambridgeUK Department of Applied Chemistry Konkuk UniversityChungjuRepublic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)College of Natural SciencesUlsanRepublic of Korea Department of Physics Incheon National UniversityIncheonRepublic of Korea Intelligent Sensor Convergence Research Center Incheon National UniversityIncheonRepublic of Korea Institute of Basic Science Incheon National UniversityIncheonRepublic of Korea Division of Material Analysis and Research Korea Basic Science InstituteDaejeonRepublic of Korea

A conventional electrode composite for rechargeable zinc-ion batteries(ZIBs)includes a binder for strong adhesion between the electrode material and the current ***,the introduction of a binder leads to electrochemical inactivity and low electrical conductivity,resulting in the decay of the capacity and a low rate *** present a binder-and conducting agent-free VO_(2)composite electrode using in situ polymerization of dopamine on a flexible current collector of pyroprotein-based *** as-fabricated composite electrode was used as a substrate for the direct growth of VO_(2)as a self-supported form on polydopamine-derived pyroprotein-based fibers(pp-fibers@VO_(2)(B)).It has a high conductivity and flexible nature as a current collector and moderate binding without conventional binders and conducting agents for the VO_(2)(B)*** addition,their electrochemical mechanism was *** energy storage is induced by Zn^(2+)/H^(+)coinsertion during discharging,which can be confirmed by the lattice expansion,the formation of by-products including Zn_(x)(OTf)_(y)(OH)_(2x−y)·nH_(2)O,and the reduction of V^(4+)to V^(3+).Furthermore,the assembled Zn//pp-fibers@VO_(2)(B)pouch cells have excellent flexibility and stable electrochemical performance under various bending states,showing application possibilities for portable and wearable power sources.

关键词： aqueous battery binder free conducting agent‐free flexible electrode zinc‐ion battery

Versatile on-chip light coupling and(de)multiplexing from arbitrary polarizations to controlled waveguide modes using an integrated dielectric metasurface

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Photonics Research 2020年第4期8卷 564-576页

作者： YUAN MENG ZHOUTIAN LIU ZHENWEI XIE RIDE WANG TIANCHENG QI FUTAI HU HYUNSEOK KIM QIRONG XIAO XING FU QIANG WU sang-hoon bae MALI GONG XIAOCONG YUAN State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua UniversityBeijing 100084China Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Weak-Light Nonlinear Photonics Ministry of EducationTEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

Metasurfaces have found broad applicability in free-space optics,while its potential to tailor guided waves remains barely *** synergizing the Jones matrix model with generalized Snell’s law under the phase-matching condition,we propose a universal design strategy for versatile on-chip mode-selective coupling with polarization sensitivity,multiple working wavelengths,and high efficiency *** coupling direction,operation frequency,and excited mode type can be designed at will for arbitrary incident polarizations,outperforming previous technology that only works for specific polarizations and lacks versatile mode ***,using silicon-nanoantenna-patterned silicon-nitride photonic waveguides,we numerically demonstrate a set of chip-scale optical couplers around 1.55μm,including mode-selective directional couplers with high coupling efficiency over 57%and directivity about 23 d *** and wavelength demultiplexer scenarios are also proposed with 67%maximum efficiency and an extinction ratio of 20 d ***,a chip-integrated twisted light generator,coupling free-space linear polarization into an optical vortex carrying 1 h orbital angular momentum(OAM),is also reported to validate the mode-control *** comprehensive method may motivate compact wavelength/polarization(de)multiplexers,multifunctional mode converters,on-chip OAM generators for photonic integrated circuits,and high-speed optical telecommunications.

关键词： Versatile on-chip light arbitrary polarizations waveguide modes an integrated dielectric metasurface

Highly Elastic,Bioresorbable Polymeric Materials for Stretchable,Transient Electronic Systems

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Nano-Micro Letters 2024年第6期16卷 1-13页

作者： Jeong‑Woong Shin Dong‑Je Kim Tae‑Min Jang Won bae Han Joong hoon Lee Gwan‑Jin Ko Seung Min Yang Kaveti Rajaram Sungkeun Han Heeseok Kang Jun Hyeon Lim Chan‑Hwi Eom Amay J.Bandodkar Hanul Min Suk‑Won Hwang KU‑KIST Graduate School of Converging Science and Technology Korea University145 Anam‑roSeongbuk‑guSeoul 02841Republic of Korea SK Hynix 2091Gyeongchung‑daeroBubal‑eupIcheon‑siGyeonggi‑do 17336Republic of Korea Hanwha Systems Co. Ltd.188Pangyoyeok‑roBundang‑guSeongnam‑siGyeonggi‑do 13524Republic of Korea Department of Electrical and Computer Engineering North Carolina State UniversityRaleighNC 27606USA Center for Advanced Self‑Powered Systems of Integrated Sensors and Technologies(ASSIST) North Carolina State UniversityRaleighNC 27606USA Department of Integrative Energy Engineering Korea University145 Anam‑roSeongbuk‑guSeoul 02841Republic of Korea Biomaterials Research Center Korea Institute of Science and Technology(KIST)5 Hwarang‑ro 14‑gilSeongbuk‑guSeoul 02792Republic of Korea Semiconductor R&D Center Samsung Electronics Co.Ltd.Hwaseong‑siGyeonggi‑do 18448Republic of Korea Center for Advanced Biomolecular Recognition Biomedical Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea

Substrates or encapsulants in soft and stretchable formats are key components for transient,bioresorbable electronic systems;however,elastomeric polymers with desired mechanical and biochemical properties are very limited compared to nontransient ***,we introduce a bioresorbable elastomer,poly(glycolide-co-ε-caprolactone)(PGCL),that contains excellent material properties including high elongation-at-break(<1300%),resilience and toughness,and tunable dissolution *** of PGCLs as polymer matrices,in combination with conducing polymers,yields stretchable,conductive composites for degradable interconnects,sensors,and actuators,which can reliably function under external *** of device components with wireless modules demonstrates elastic,transient electronic suture system with on-demand drug delivery for rapid recovery of postsurgical wounds in soft,time-dynamic tissues.

关键词： Biodegradable elastomer Conductive polymer composites Biomedical device Transient electronics

Accelerated precipitation behavior of cast Mg-Al-Zn alloy by grain refinement

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Journal of Materials Science & Technology 2018年第2期34卷 265-276页

作者： sang-hoon Kim Jong Un Lee Ye Jin Kim Jun Ho bae Bong Sun You Sung Hyuk Park School of Materials Science and Engineering Kyungpook National University Implementation Research Division Korea Institute of Materials Science

This study demonstrates that the precipitation behavior of 13-Mg17Al12 phase during aging and the resultant variation in hardness and mechanical properties of cast Mg-Al-Zn alloy are strongly dependent on initial grain size. Grain size reduction accelerates discontinuous precipitation at the early stage of aging treatment by increasing the area fraction of grain boundaries that can act as nucleation sites for discontinuous precipitates （DP）, but it does not influence DP growth rate. Grain refinement also prematurely terminates continuous precipitation because the formation of a large number of DP reduces the amount of AI dissolved in the matrix, which is required for the formation of continuous precipitates （CP）. This promotion of DP formation and early termination of CP formation significantly decrease the peak-aging time to one-third. The enhanced precipitation behavior also leads to an additional hardness improvement in the aged alloy, along with an increase in hardness owing to grain boundary strengthening by grain refinement. The amount of increase in hardness changes with aging time, which is determined by the variation of three variables with aging time： DP fraction difference between refined and nonrefined alloys, hardness difference between DP and matrix, and matrix hardness difference between the two alloys. Grain refinement improves both tensile strength and ductility of the homogenized alloy owing to grain boundary strengthening and suppression of twinning activation, respectively. However, the loss of ductility after peak-aging treatment is greater in the refined alloy because of the larger amount of DP acting as a crack source in this alloy.

关键词： Magnesium Grain refinement Aging Precipitation Tensile properties

Stress-induced cardiomyopathy with electrocardiographic ST-segment elevation in a patient with pneumothorax

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World Journal of Emergency Medicine 2020年第4期11卷 260-262页

作者： Jun Woo Cho Chi hoon bae Department of Thoracic and Cardiovascular Surgery School of MedicineCatholic University of DaeguDaeguRepublic of Korea

Dear editor,In many cases,S T-segment changes on electrocardiogram(ECG)are suggestive of acute coronary syndrome,but there may be other causes,[12]such as stress induced ***,reports of such changes in patients with pneumothorax are very rare.[3-1]Here,we report a case of ST-segment elevation due to stress-induced cardiomyopathy in a patient with pneumothorax.

关键词： cardiomyopathy acute patient

Unveiling anomalous lattice shrinkage induced by Pi-backbonding in Prussian blue analogues

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Journal of Energy Chemistry 2022年第7期31卷 121-128,I0004页

作者： Ju-Hyeon Lee Jin-Gyu bae Hyeon Jeong Lee Ji hoon Lee School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials University of OxfordOxford OX13PHUnited Kingdom

Transition-metal(TM)-based Prussian blue and its analogues(TM-PBAs) have attracted considerable attention as cathode materials owing to their versatile ion storage capability with tunable working voltages. TM-PBAs with different crystal structures, morphologies, and TM combinations can exhibit excellent electrochemical properties because of their unique and robust host frameworks with well-defined ionic diffusion channels. Nonetheless, there is still a lack of understanding regarding the performance dependence of TM-PBAs on structural changes during charging/discharging processes. In this study, in situ X-ray diffraction and X-ray absorption fine structure analyses elucidate the TMdependent structural changes in a series of TM-PBAs during the charging and discharging *** the discharging process, the lattice volume of Fe-PBA increased while those of Ni-and Cu-PBAs decreased. This discrepancy is attributed to the extent of size reduction of the cyanometallate complex([Fe(CN)_(6)]) via pi-backbonding from Fe to C due to redox flips of the low-spin Fe^(3+/2+) ion. This study presents a comprehensive understanding of how TM selection affects capacity acquisition and phase transition in TM-PBAs, a promising class of cathode materials.

关键词： Prussian blue analogues X-ray diffraction X-ray absorption fine structure Pi-backdonation Cyanides

Complete response of metastatic BRAF V600-mutant anaplastic thyroid cancer following adjuvant dabrafenib and trametinib treatment:A case report

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世界临床病例杂志 2023年第27期11卷 6664-6669页

作者： sang Jae Lee Si-Youn Song Min Kyoung Kim Hyung Gyun Na Chang hoon bae Yong-Dae Kim Yoon Seok Choi Department of Otorhinolaryngology-Head and Neck Surgery College of MedicineYeungnam UniversityDaegu 42415South Korea Division of Hematology-Oncology Department of Internal MedicineCollege of MedicineYeungnam UniversityDaegu 42415South Korea Regional Center for Respiratory Diseases Yeungnam University Medical CenterDaegu 42415South Korea

BACKGROUND Anaplastic thyroid cancer(ATC)is a rare but aggressive type of thyroid *** V600E-mutation,which is found in 10%-50%of ATCs,is associated with poor prognosis.A recent clinical trial reported a substantial clinical benefit of concomitant treatment of dabrafenib(BRAF inhibitor)and trametinib(MEK inhibitor)for treating BRAF V600E-mutant ***,reports on patients with ATC treated with this regimen following surgery are *** SUMMARY We report the case of a 63-year-old female patient diagnosed with BRAF V600Emutant *** three surgeries—total thyroidectomy,total laryngectomy,and neck dissection—she was diagnosed with lung metastasis during *** metastatic ATC was successfully treated with dabrafenib and *** patient achieved a complete response at the 32-mo *** Adjuvant chemotherapy with dabrafenib plus trametinib is efficacious for treatment and prevention of recurrent ATC with BRAF mutation following surgery.

关键词： Thyroid carcinoma Anaplastic BRAF Dabrafenib Trametinib Chemotherapy Adjuvant Case report

Bee venom phospholipase A2 ameliorates amyloidogenesis and neuroinflammation through inhibition of signal transducer and activator of transcription-3 pathway in Tg2576 mice

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Translational Neurodegeneration 2019年第1期8卷 317-332页

作者： Hyeon Joo Ham sang-bae Han Jaesuk Yun In Jun Yeo Young Wan Ham Se Hyun Kim Pil-hoon Park Dong-Young Choi Jin Tae Hong College of Pharmacy and Medical Research Center Chungbuk National UniversityOsongsaengmyeong 1-roOsong-eupHeungdeok-guCheongjuChungbuk 28160Republic of Korea Department of Chemistry Utah Valley University800 W University PkwyOremUT 84058USA INISTst Co. LTD767Sinsu-roSuji-guYongin-si 16827Gyeonggi-doRepublic of Korea College of Pharmacy Yeungnam University280 Daehak RoadGyeonsanGyeongbuk 38541Republic of Korea

Background:Neuroinflammation and accumulation ofβ-amyloid(Aβ)play a significant role in the onset and progression of Alzheimer’s disease(AD).Our previous study demonstrated that signal transducer and activator of transcription-3(STAT3)plays a major role in neuroinflammation and ***:In the present study,we investigated the inhibitory effect of bee venom phospholipase A2(bvPLA2)on memory deficiency in Tg2576 mice,which demonstrate genetic characteristics of AD and the mechanism of its action at the cellular and animal *** in vivo study,we examined the effect of bvPLA2 on improving memory by conducting several behavioral tests with the administration of bvPLA2(1 mg/kg)to Tg2576 *** in vitro study,we examined the effect of bvPLA2 on amyloidogenesis and neuroinflammation by treating bvPLA2 on LPSactivated BV2 ***:We found that bvPLA2 alleviated memory impairment in Tg2576 mice,as demonstrated in the behavioral tests assessing *** the bvPLA2-treated group,Aβ,amyloid precursor protein(APP),and β-secretase 1(BACE1)levels and β-secretase activity were significantly *** of pro-inflammatory cytokines and inflammation-related proteins decreased in the brain of bvPLA2-treated group,whereas anti-inflammatory cytokines *** addition,bvPLA2 reduced STAT3 phosphorylation in the brains of the bvPLA2-treated *** the cellular level,bvPLA2 inhibits production of nitric oxide,pro-inflammatory cytokines,and inflammation-related proteins including ***,bvPLA2 inhibits the production of Aβin cultured BV-2 *** from the docking experiment,pull-down assay,and the luciferase assay show that bvPLA2 directly binds STAT3 and,thus,regulates gene expression ***,when the STAT3 inhibitor and bvPLA2 were administered together,the anti-amyloidogenic and anti-inflammatory effects were further enhanced than when they were administered ***:These results suggest that bvPLA2 could r

关键词： Bee venom phospholipase A2 Alzheimer’s disease Amyloidogenesis Neuroinflammation STAT3