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Design study of a radio-frequency quadrupole for high-intensity beams

Chinese Physics C 2017年第7期41卷 142-150页

作者： Jungbae Bahng Eun-San Kim Bong-hyuk Choi Department of Physics Kyungpook National University Daegu 41566 Republic of Korea Department of Accelerator Science Graduate School Korea University Sejong campus Sejong 30019 Republic of Korea Institute for Basic Science Daejeon 34047 Republic of Korea

The Rare isotope Accelerator Of Newness（RAON） heavy-ion accelerator has been designed for the Rare Isotope Science Project（RISP） in Korea. The RAON will produce heavy-ion beams from 660-MeV-proton to200-MeV/u-uranium with continuous wave（CW） power of 400 k W to support research in various scientific *** system consists of an ECR ion source, LEBTs with 10 ke V/u, CW RFQ accelerator with 81.25 MHz and 500 ke V/u, a MEBT system, and a SC linac. In detail, the driver linac system consists of a Quarter Wave Resonator（QWR） section with 81.25 MHz and a Half Wave Resonator（HWR） section with 162.5 MHz, Linac-1, and a Spoke Cavity section with 325 MHz, Linac-2. These linacs have been designed to optimize the beam parameters to meet the required design goals. At the same time, a light-heavy ion accelerator with high-intensity beam, such as proton,deuteron, and helium beams, is required for experiments. In this paper, we present the design study of the high intensity RFQ for a deuteron beam with energies from 30 ke V/u to 1.5 MeV/u and currents in the m A range. This system is composed of an Penning Ionization Gauge ion source, short LEBT with a RF deflector, and shared SC Linac. In order to increase acceleration efficiency in a short length with low cost, the 2nd harmonic of 162.5 MHz is applied as the operation frequency in the D^＋RFQ design. The D^＋RFQ is designed with 4.97 m, 1.52 bravery factor. Since it operates with 2nd harmonic frequency, the beam should be 50% of the duty factor while the cavity should be operated in CW mode, to protect the downstream linac system. We focus on avoiding emittance growth by the space-charge effect and optimizing the RFQ to achieve a high transmission and low emittance growth. Both the RFQ beam dynamics study and RFQ cavity design study for two and three dimensions will be discussed.

关键词： heavy-ion accelerator RFQ accelerator high intensity RFQ beam dynamics RFQ cavity design

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An Elliptic Nonlinear System of Two Functions with Application

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Journal of Partial Differential Equations 2023年第2期36卷 122-146页

作者： KANG Joon hyuk ROBERTSON Timothy Department of Mathematics Andrews UniversityBerrien Springs MI.49104-0350U.S.A Department of Mathematics University of TennesseeKnoxville TN.37996-1320U.S.A

The purpose of this paper is to give a sufficient conditions for the existence and uniqueness of positive solutions to a rather general type of elliptic system of the Dirichlet problem on a bounded domain Ω in R^(n).Also considered are the effects of perturbations on the coexistence state and *** techniques used in this paper are super-sub solutions method,eigenvalues of operators,maximum principles,spectrum estimates,inverse function theory,and general elliptic *** arguments also rely on some detailed properties for the solution of logistic *** results yield an algebraically computable criterion for the positive coexistence of competing species of animals in many biological models.

关键词： Competition system coexistence state

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OTS Scheme Based Secure Architecture for Energy-Efficient IoT in Edge Infrastructure

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Computers, Materials & Continua 2021年第3期66卷 2905-2922页

作者： Sushil Kumar Singh Yi Pan Jong hyuk Park Department of Computer Science and Engineering Seoul National University of Science and TechnologySeoul01811South Korea Department of Computer Science Georgia State UniversityAtlantaGA30302-5060USA

For the past few decades,the Internet of Things(IoT)has been one of the main pillars wielding significant impact on various advanced industrial applications,including smart energy,smart manufacturing,and *** applications are related to industrial plants,automation,and e-healthcare *** applications have several issues related to developing,planning,and managing the ***,IoT is transforming into G-IoT(Green Internet of Things),which realizes energy *** provides high power efficiency,enhances communication and ***,this paradigm did not resolve all smart applications’challenges in edge infrastructure,such as communication bandwidth,centralization,security,and *** this paper,we propose the OTS Scheme based Secure Architecture for Energy-Efficient IoT in Edge Infrastructure to resolve these *** OTS-based Blockchain-enabled distributed network is used at the fog layer for security and *** evaluated our proposed architecture’s performance quantitatively as well as security and *** conducted a comparative analysis with existing studies with different measures,including computing cost time and communication *** a result of the evaluation,our proposed architecture showed better performance.

关键词： Blockchain energy-efficient IoT ots scheme edge infrastructure security and privacy

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Multi-omics approach in tea polyphenol research regarding tea plant growth,development and tea processing:current technologies and perspectives

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Food Science and Human Wellness 2022年第3期11卷 524-536页

作者： Jingwen Li Yu Wang Joon hyuk Suh Department of Food Science and Human Nutrition Citrus Research and Education CenterUniversity of FloridaFL 33850USA

Polyphenols are one of the most important metabolites in tea due to their unique biological activities and health benefits,arousing great attention of researchers to investigate biochemical mechanisms of polyphenols during tea plant growth,development and tea *** omics has been used as a major analytical platform for tea polyphenol research with some proven merits,a single-omics strategy remains a considerable challenge due to the complexity of biological system and functional processes of tea in each stage of tea *** advances in multi-omics approaches and data analysis have enabled mining and mapping of enormous number of datasets at different biological scales from genotypes to phenotypes of living *** new technologies combining genomics,metagenomics,transcriptomics,proteomics and/or metabolomics can pave a new avenue to address fundamental questions regarding polyphenol formation and changes in tea plants and ***,we review recent progresses in single-and multi-omics approaches that have been used in the field of tea polyphenol *** perspectives on future research and applications for improvement of tea polyphenols as well as current challenges of multi-omics studies for tea polyphenols are also discussed.

关键词： Multi-omics Single-omics Tea polyphenols Tea breeding and processing

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Probing temperature-dependent interlayer coupling in a MoS2/h-BN heterostructure

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Nano Research 2020年第2期13卷 576-582页

作者： Hamin Park Gwang hyuk Shin Khang June Lee Sung-Yool Choi School of Electrical Engineering Centerfor Advanced Materials Discovery towards 3D Display KAISTDaejeon 34141Republic of Korea

Stacking of atomically thin layers of two-dimensional materials has revealed extraordinary physical phenomena owing to van der Waals(vdW)interaction at the ***,most of the studies focused on the transition metal dichalcogenide(TMD)/TMD heterostructure,while the interlayer coupling of the TMD/hexagonal boron nitride(h-BN)heterostructure has not been extensively explored despite its *** this study,the temperature-dependent interlayer coupling is demonstrated in a heterostructure of molybdenum disulfide(MoS2)and *** interface between MoS2 and the insulating substrate exerts a significant spectroscopic impact on MoS2 through substrate-induced local strain,charged impurity,and vdW *** non-resonant conditions,temperature-dependent peak shifts in Raman and photoluminescence(PL)spectra of MoS2 reveal the evolution of interlayer *** frequencies and PL peak energies at different temperatures demonstrate how substrate-induced strain,impurity,and vdW interactions at the interface influence phonon vibration and excitonic transition of *** resonant conditions at low temperature,anomalous Raman modes appear in the MoS2/h-BN heterostructure because of the enhanced electron-phonon coupling and vdW *** anomalous Raman modes are quantitatively investigated by the deconvolution of the resonance Raman spectra and described by interlayer coupling at low temperature,in agreement with complementary indications from the temperature-dependent evolution of non-resonant Raman and PL spectra.

关键词： van der Waals heterostructures interlayer coupling Raman spectroscopy excitonic resonance photoluminescence

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Evaluation of the relationship between dietary factors,CagA-positive Helicobacter pylori infection,and RUNX3 promoter hypermethylation in gastric cancer tissue

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World Journal of Gastroenterology 2013年第11期19卷 1778-1787页

作者： Yan-Wei Zhang Sang-Yong Eom Dong-hyuk Yim Young-Jin Song Hyo-Yung Yun Joo-Seung Park Sei-Jin Youn Byung-Sik Kim Yong-dae Kim Heon Kim Department of Preventive Medicine and Medical Research Institute College of MedicineChungbuk National UniversityCheongju 361-763South Korea Department of Surgery College of MedicineChungbuk National UniversityCheongju 361-763South Korea Department of Surgery College of MedicineEulji UniversityDaejon 461-713South Korea Department of Internal Medicine College of MedicineChungbuk National UniversityCheongju 361-763South Korea Department of Surgery Asan Medical CenterCollege of MedicineUlsan UniversitySeoul 138-736South Korea

AIM:To evaluate the relationship among Helicobacter pylori(***) infection,CagA status,and dietary factors with RUNX3 promoter ***:Gastric cancer tissue samples were collected from 184 South Korean *** patients were interviewed following a semi-quantitative food frequency *** average frequencies of intake and portion sizes of 89 common food items were documented,and total intakes of calories,nutrients,vitamins,and minerals were calculated for each *** was extracted from gastric cancer tissue samples,and amplification of the HSP60 gene was performed to detect *** *** polymerase chain reaction(PCR) was used to detect the presence of the CagA ***3 gene expression was measured by reverse transcription-PCR,and RUNX3 methylation status was evaluated by methylation-specific *** odds ratios(ORs) and 95%CI associated with RUNX3 promoter hypermethylation status were estimated for each of the food groups,lifestyle factors,and the interaction between dietary and lifestyle factors with CagA status of *** ***:Overall,164 patients(89.1%) were positive for *** DNA,with the CagA gene detected in 59(36%) of these ***-positive *** all,106(57.6%) patients with gastric cancer demonstrated CpG island hypermethylation at the RUNX3 ***3 expression was undetectable in 52(43.7%) of the 119 gastric cancer tissues sampled.A high consumption of eggs may increase the risk of RUNX3 methylation in gastric cancer patients,having a mean OR of 2.15(range,1.14-4.08).A significantly increased OR of 4.28(range,1.19-15.49) was observed with a high consumption of nuts in patients with CagA-positive *** *** intakes of carbohydrate,vitamin B1,and vitamin E may decrease the risk of RUNX3 methylation in gastric cancer tissue,particularly in CagA-or ***-negative infection,with OR of 0.41(0.19-0.90),0.42(0.20-0.89),and 0.29(0.13-0.62),respectively.A high consumpt

关键词： Gastric cancer RUNX3 Helicobacter pylori CagA Dietary factors

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Recent advances in soft electronic materials for intrinsically stretchable optoelectronic systems

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Opto-Electronic Advances 2022年第8期5卷 21-49页

作者： Ja Hoon Koo Huiwon Yun Woongchan Lee Sung-hyuk Sunwoo Hyung Joon Shim dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea School of Chemical and Biological Engineering Institute of Chemical ProcessesSeoul National UniversitySeoul 08826Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea.

In recent years,significant progress has been achieved in the design and fabrication of stretchable optoelectronic *** general,stretchability has been achieved through geometrical modifications of device components,such as with serpentine interconnects or buckled ***,the local stiffness of individual pixels and the limited pixel density of the array have impeded further advancements in stretchable ***,intrinsically stretch-able optoelectronics have been proposed as an alternative ***,we review the recent advances in soft elec-tronic materials for application in intrinsically stretchable optoelectronic ***,we introduce various intrinsically stretchable electronic materials,comprised of electronic fillers,elastomers,and surfactants,and exemplify different in-trinsically stretchable conducting and semiconducting *** also describe the processing methods used to fabricate the electrodes,interconnections,charge transport layers,and optically active layers used in intrinsically stretch-able optoelectronic ***,we review representative examples of intrinsically stretchable optoelectronic devices,including light-emitting capacitors,light-emitting diodes,photodetectors,and ***,we briefly discuss intrinsically stretchable integrated optoelectronic systems.

关键词： stretchable optoelectronics light-emitting capacitors light-emitting diodes photodetectors photovoltaics intrinsically stretchable devices

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Microstructural characteristics of AZ31 alloys rolled at room and cryogenic temperatures and their variation during annealing

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Journal of Magnesium and Alloys 2020年第2期8卷 537-545页

作者： Sang Won Lee Sang-Hoon Kim Sung hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

This study investigates the microstructural characteristics of AZ31 Mg alloys rolled at room temperature(RT)and cryogenic temperature(CT)and the variation in their microstructure and hardness during subsequent *** induces the formation of more side cracks than does RT rolling,because of the reduction in the ability of the material to accommodate deformation at ***{10-11}contraction and{10-11}-{10-12}double twins are formed in both the material rolled at RT and that rolled at CT,because the grains of the initial material are favorably oriented for{10-11}twinning under *** RT-rolled material has a higher dislocation density than the cryorolled material,and more twins are uniformly distributed throughout the former *** a result,static recrystallization during subsequent annealing is more pronounced in the RT-rolled material,which results in the formation of a highly recrystallized homogeneous microstructure after *** contrast,the formed twins are predominantly present along the shear bands in the cryorolled material,as a result of which this material has an inhomogeneous bi modal structure containing a large amount of coarse unrecrystallized grains after *** hardness of the annealed RT-rolled material is higher than that of the annealed cryorolled material owing to the finer grain structure of the former.

关键词： Magnesium Rolling Cryogenic temperature Annealing Microstructure

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Recovery of an injured corticospinal tract by subcortical peri-lesional reorganization in a patient with intracerebral hemorrhage

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Neural Regeneration Research 2016年第7期11卷 1191-1192页

作者： Sung Ho Jang Woo hyuk Jang Department of Physical Medicine and Rehabilitation College of MedicineYeungnam UniversityDaemyungdong

The corticospinal tract （CST） is a neural tract responsible for motor function in the human brain. It is mainly related to hand movements （Iang, 2014）. Therefore, recovery of an injured CST contributes to good recovery in stroke patients and a thorough knowledge of the recovery mechanism regarding an injured CST is required for successful brain rehabilitation.

关键词： reorganization subcortical intracerebral injured radiata cortex rehabilitation ganglia corona ventricle

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Schottky barrier modulation of bottom contact SnO_(2) thin-film transistors via chloride-based combustion synthesis

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Journal of Materials Science & Technology 2023年第17期148卷 199-208页

作者： Bongho Jang Junhee Lee Hongki Kang Jaewon Jang hyuk-Jun Kwon Department of Electrical Engineering and Computer Science DGISTDaegu 42988South Korea School of Electronic and Electrical Engineering Kyungpook National UniversityDaegu 41566South Korea School of Electronics Engineering Kyungpook National UniversityDaegu 41566South Korea Convergence Research Advanced Centre for Olfaction DGISTDaegu 42988South Korea

The enhanced carrier flow at the interface between Au and SnO_(2)semiconductors,which initially form Schottky contacts,is realized using chloride-based combustion ***-based combustion sys-tems can achieve chlorine(Cl)doping effects as well as conversion to crystalline SnO_(2)films at clearly lower temperatures(∼250℃)than conventional *** to the Cl doping effect,the high carrier concentration can induce thin potential barriers at the metal/semiconductor(MS)junctions,resulting in carrier injection by *** a result,compared to conventional SnO_(2)thin-film transistors,the de-vices fabricated by combustion synthesis exhibit significantly improved electrical performance with field-effect mobility of 6.52 cm 2/Vs(∼13 times),subthreshold swing of 0.74 V/dec,and on/offratio of∼10^(7)below 300℃.Furthermore,because of the enhanced tunneling carriers induced by the narrowed barrier width,the Schottky barriers are significantly reduced from 0.83 to 0.29 eV(65%decrease)at 250℃and from 0.42 to 0.17 eV(60%decrease)at 400℃.Therefore,chloride-based combustion synthesis can con-tribute to developing SnO_(2)-based electronics and flexible devices by achieving both high-quality oxide films and improved current flow at the MS interface with low-temperature annealing.

关键词： SnO_(2) Combustion Sol-gel Schottky contact Thin-film transistors

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