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Density Dependence of Electron Spin Relaxation Time in GaA

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Open Journal of Applied Sciences 2016年第6期6卷 365-371页

作者： nam lyong kang Department of Nanomechatronics Engineering Pusan National University Miryang Korea

The electron density dependence of the electron spin relaxation time in a system of electrons interacting with phonons through phonon-modulated spin-orbit coupling was calculated using the formula for electron spin resonance derived by the projection-reduction method. The electron spin relaxation time in GaAs increased with increasing electron density, and the electron density was found to affect the electron spin relaxation differently according to temperature. The electron spin in GaAs was relaxed mainly by optical phonon scattering at high electron densities and piezoelectric phonon scattering at relatively low electron densities.

关键词： Spintronics Electron-Phonon Interaction Projection-Reduction Method

A Loop Diagram Approach to the Nonlinear Optical Conductivity for an Electron-Phonon System

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Journal of Modern Physics 2011年第11期2卷 1410-1414页

作者： nam lyong kang Sang Don Choi 不详

A loop diagram approach to the nonlinear optical conductivity of an electron-phonon system is introduced. This approach can be categorized as another Feynman-like scheme because all contributions to the self-energy terms can be grouped into topologically-distinct loop diagrams. The results for up to the first order nonlinear conductivity are identical to those derived using the KC reduction identity (KCRI) and the state- dependent projection operator (SDPO) introduced by the present authors. The result satisfies the “population criterion” in that the population of electrons and phonons appear independently or the Fermi distributions are multiplied by the Planck distributions in the formalism. Therefore it is possible, in an organized manner, to present the phonon emissions and absorptions as well as photon absorptions in all electron transition processes. In additions, the calculation needed to obtain the line shape function appearing in the energy denominator of the conductivity can be reduced using this diagram method. This method shall be called the “KC loop diagram method”, since it originates from proper application of KCRI’s and SDPO’s.

关键词： Optical Conductivity Projection Operator KC Reduction Identity Electron-Phononinteraction

Advancements in Passive Wireless Sensing Systems in Monitoring Harsh Environment and Healthcare Applications

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Nano-Micro Letters 2025年第5期17卷 145-192页

作者： Wei Yue Yunjian Guo Jong‐Chul Lee Enkhzaya Ganbold Jia-kang Wu Yang Li Cong Wang Hyun Soo Kim Young-Kee Shin Jun-Ge Liang Eun-Seong Kim nam-Young Kim RFIC Bio Centre Kwangwoon UniversitySeoul 01897South Korea Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897South Korea Department of Electronic Engineering Jiangnan UniversityWuxi 214122People’s Republic of China School of Microelectronics Shandong UniversityJinan 250101People’s Republic of China School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China Department of Electronics Engineering Kwangwoon UniversitySeoul 01897South Korea Laboratory of Molecular Pathology and Cancer Genomics Department of Molecular Medicine and Biopharmaceutical SciencesGraduate School of Convergence Science and TechnologySeoul National UniversitySeoul 08826South Korea

Recent advancements in passive wireless sensor technology have significantly extended the application scope of sensing,particularly in challenging environments for monitoring industry and healthcare *** systems are equipped with battery-free operation,wireless connectivity,and are designed to be both miniaturized and *** features enable the safe,real-time monitoring of industrial environments and support high-precision physiological measurements in confined internal body spaces and on wearable epidermal *** the exploration into diverse application environments,the development of a systematic and comprehensive research framework for system architecture remains elusive,which hampers further optimization of these *** review,therefore,begins with an examination of application scenarios,progresses to evaluate current system architectures,and discusses the function of each component—specifically,the passive sensor module,the wireless communication model,and the readout module—within the context of key implementations in target sensing ***,we present case studies that demonstrate the feasibility of proposed classified components for sensing scenarios,derived from this systematic *** outlining a research trajectory for the application of passive wireless systems in sensing technologies,this paper aims to establish a foundation for more advanced,user-friendly applications.

关键词： Wireless sensing Passive detection Harsh environment Biomedical monitoring Flexible sensors

Uniaxially crumpled graphene as a platform for guided myotube formation

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Microsystems & Nanoengineering 2019年第1期5卷 144-153页

作者： Junghoon Kim Juyoung Leem Hong nam Kim Pilgyu kang Jonghyun Choi Md Farhadul Haque Daeshik kang SungWoo nam Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Center for BioMicrosystems Brain Science InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea Department of Mechanical Engineering George Mason UniversityFairfaxVA 22030USA Department of Mechanical Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA

Graphene,owing to its inherent chemical inertness,biocompatibility,and mechanical flexibility,has great potential in guiding cell behaviors such as adhesion and ***,due to the two-dimensional(2D)nature of graphene,the microfabrication of graphene into micro/nanoscale patterns has been widely adopted for guiding cellular *** this study,we report crumpled graphene,i.e.,monolithically defined graphene with a nanoscale wavy surface texture,as a tissue engineering platform that can efficiently promote aligned C2C12 mouse myoblast cell *** imparted out-of-plane,nanoscale crumpled morphologies to flat graphene via compressive straininduced *** C2C12 mouse myoblast cells were seeded on the uniaxially crumpled graphene,not only were the alignment and elongation promoted at a single-cell level but also the differentiation and maturation of myotubes were enhanced compared to that on flat *** results demonstrate the utility of the crumpled graphene platform for tissue engineering and regenerative medicine for skeletal muscle tissues.

关键词： Uniaxial graphene alignment

Impact of nonalcoholic fatty liver disease on the risk of gallbladder polyps in lean and non-obese individuals:A cohort study

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Hepatobiliary & Pancreatic Diseases International 2024年第6期23卷 573-578页

作者： nam Hee Kim Ji Hun kang Hong Joo Kim Division of Gastroenterology Department of Internal MedicineKangbuk Samsung HospitalSungkyunkwan University School of MedicineSeoulKorea Department of Radiology Hanyang University Guri HospitalHanyang University College of MedicineGuriKorea

Background:The association between non-obese or lean nonalcoholic fatty liver disease(NAFLD)and gallbladder polyps(GBPs)has not yet been *** aimed to determine whether NAFLD is an independent risk factor for the development of GBPs,even in non-obese and lean ***:We analyzed a cohort of 331208 asymptomatic adults who underwent abdominal ultrasonography(US).The risk of GBP development was evaluated according to the obesity and NAFLD ***:The overall prevalence of NAFLD and GBPs≥5 mm was 28.5%and 2.9%,*** prevalence of NAFLD among 160276 lean,77676 overweight and 93256 obese participants was 8.2%,31.2%,and 61.1%,*** with NAFLD had a significantly higher incidence of GBPs with a size of≥5 mm[adjusted odds ratio(OR)=1.18;95%confidence interval(CI):1.11–1.25].A higher body mass index and its categories were also significantly associated with an increased risk of GBPs≥5 ***,risk of GBPs≥5 mm was significantly increased even in NAFLD individuals who are not obese(lean:adjusted OR=1.36,95%CI:1.19-1.54;overweight:adjusted OR=1.14,95%CI:1.03–1.26,respectively).Conclusions:Non-obese/lean NAFLD is an independent risk factor for GBP development,suggesting that NAFLD may play an important role in the pathogenesis of GBPs regardless of the obesity ***,a more thorough evaluation for GBPs may be necessary when hepatic steatosis is detected on abdominal US,even in non-obese or lean individuals.

关键词： Nonalcoholic fatty liver disease Non-obese Lean Gallbladder polyps

Apocrine hidrocystoma of the conjunctiva

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International Journal of Ophthalmology(English edition) 2012年第2期5卷 247-248页

作者： Boyun Kim nam Yeo kang Department of Ophthalmology Bucheon St. Mary's Hospital College of Medicine The Catholic University of Korea Bucheon Kyunggi-do 420-717 Korea

Dear Sir, I am Dr. Boyun Kim, form the Department of Ophthalmology, Bucheon St. Mary’s Hospital, Bucheon, Korea. I write to present a case report of apocrine hidrocystoma on temporal bulbar conjunctiva. Apocrine hidrocystoma (AH) is a benign cutaneous cystic nodule arising from apocrine glands of Moll [1]. This lesion usually occurs on eyelids and canthus [1,2], ears, chest, shoulders in adults but its occurrence in conjunctiva [3] is

关键词： Figure Apocrine hidrocystoma of the conjunctiva

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

Rice ONAC005-OsMADS50-OsMADS56 interaction downregulates OsLFL1 in promoting long-day-dependent flowering

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The Crop Journal 2024年第6期12卷 1607-1618页

作者： Jinku kang Kiyoon kang Sang-Ji Lee Yejin Shim Sung-Hwan Cho nam-Chon Paek Department of Agriculture Forestry and BioresourcesPlant Genomics and Breeding InstituteResearch Institute of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Republic of Korea Division of Life Sciences Incheon National UniversityIncheon 22012Republic of Korea

The transition from the vegetative to reproductive stage(flowering)is a critical stage in the life cycle of *** to flowering is controlled by a complex photoperiod-dependent ***,we report the functional analysis of NAC transcription factor ONAC005 as a positive regulator of flowering in *** onac005-1 T-DNA insertion mutant showed late flowering only under long-day(LD)conditions,indicating that ONAC005 is an LD-dependent flowering *** analysis of flowering time genes revealed that ONAC005 negatively regulates expression of OsLFL1,which is a LD-specific repressor of flowering in ***,ONAC005 up-regulates expression of downstream genes Ehd1,Hd3a,and RFT1 under LD ***005 physically interacts with previously reported upstream regulators of OsLFL1,OsMADS50 and *** assays showed that ONAC005 binds to the promoter regions of *** further found that the ONAC005-OsMADS50-OsMADS56 complex weakly repressed OsLFL1 at the early vegetative stage and then gradually repressed it at the transcriptional level as the plant *** together,our results suggest that ONAC005 specifically affects flowering under LD-dependent conditions by interacting with an antagonistic protein complex.

关键词： Rice NAC transcription factor Flowering time ONAC005

Mechanically reconfigurable architectured graphene for tunable plasmonic resonances

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Light(Science & Applications) 2018年第1期7卷 895-903页

作者： Pilgyu kang Kyoung-Ho Kim Hong-Gyu Park SungWoo nam Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Mechanical Engineering George Mason UniversityFairfaxVA 22030USA Department of Physics Korea UniversitySeoul 02841Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Graphene nanostructures with complex geometries have been widely explored for plasmonic applications,as their plasmonic resonances exhibit high spatial confinement and gate ***,edge effects in graphene and the narrow range over which plasmonic resonances can be tuned have limited the use of graphene in optical and optoelectronic *** we present a novel approach to achieve mechanically reconfigurable and strongly resonant plasmonic structures based on crumpled *** calculations show that mechanical reconfiguration of crumpled graphene structures enables broad spectral tunability for plasmonic resonances from mid-to nearinfrared,acting as a new tuning knob combined with conventional electrostatic ***,a continuous sheet of crumpled graphene shows strong confinement of plasmons,with a high near-field intensity enhancement of~1×10^(4).Finally,decay rates for a dipole emitter are significantly enhanced in the proximity of finite-area biaxially crumpled graphene *** findings indicate that crumpled graphene provides a platform to engineer graphenebased plasmonics through broadband manipulation of strong plasmonic resonances.

关键词： plasmon figuration proximity