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SSRN 2024年

作者： Lee, Hyunseok Ye, Sung-Joon Kim, Hong Suk Kim, Ah Reum Yu, Hyungjoon Kim, Myung-Jin Korea Institute of Nuclear Safety Daejeon Korea Republic of Program in Biomedical Radiation Sciences Department of Transdisciplinary Studies Graduate School of Convergence Science and Technology Seoul National University Seoul Korea Republic of Research Institute for Convergence Science Seoul National University Seoul Korea Republic of Advanced Institute of Convergence Technology Seoul National University Suwon Korea Republic of RADPION Inc. Daejeon Korea Republic of

A study on retrospective dosimetry was performed using electronic personal dosimeters (EPDs) for reconstructing doses received by radiographic testing workers. The dosimetric properties of the thermoluminescence (TL) peak in the temperature range of 100-200 °C were investigated by measuring the TL of the resistor extracted from the EPDs in a darkroom environment. Results showed that this TL peak exhibited optimal dosimetric properties, with a minimum detectable dose as low as 13 mGy. To calculate the absorbed dose using the resistor, a simplified single aliquot regenerative (SAR) dose method using the TL peak was employed. The zero dose of the commercial EPD (model CLOVER) was determined to be 58 ± 72 mGy through the random selection of six EPDs. Additionally, a dose overestimation correction factor of 1.73 ± 0.09 was calculated. Furthermore, it was observed that the TL signal faded exponentially to approximately 60% over a period of 12 weeks. Subsequently, retrospective dosimetry was performed by irradiating EPDs with a standard gamma ray dose of 1 Gy. The radiation exposure dose calculated from the TL peak of the resistor was found to be approximately 10% lower. These findings showed that the retrospective dosimetry with EPD can be utilized for accurately estimating the radiation exposure dose. © 2024, The Authors. All rights reserved.

关键词： Thermoluminescence

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Role of Direct Plasma Irradiation, Plasma-Activated Liquid, and Plasma-Treated Soil in Plasma Agriculture

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Plasma Medicine 2023年第3期13卷 33-52页

作者： Attri, Pankaj Okumura, Takamasa Takeuchi, Nozomi Razzokov, Jamoliddin Zhang, Quanzhi Kamataki, Kunihiro Shiratani, Masaharu Koga, Kazunori Center of Plasma Nano-Interface Engineering Kyushu University Fukuoka819-0395 Japan Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka819-0395 Japan Faculty of Information Science and Electrical Engineering Kyushu University Fukuoka819-0395 Japan Department of Electrical and Electronic Engineering Tokyo Institute of Technology Tokyo152-8552 Japan Institute of Material Sciences Academy of Sciences Chingiz Aytmatov 2b Tashkent100084 Uzbekistan School of Physics Dalian University of Technology Dalian China Quantum and Photonics Technology Research Center Kyushu University Fukuoka819-0395 Japan Institute for Advanced Study Kyushu University Fukuoka819-0395 Japan

Seed treatment with non-thermal plasma has seen a tremendous increase in both direct and indirect applications recently. In this review, we examined the effects of direct plasma irradiation, plasma-activated water (PAW), plasma-activated Ringer’s lactate solution, and plasma-treated soil on seeds, resulting in positive, negative, and neutral changes. Furthermore, we will compare the impact of pressure and feed gases on seed germination and seedling growth. Addition-ally, we focused on the types of reactive oxygen and nitrogen species (RONS) and their concentrations produced in the gas and liquid phases, as these play a crucial role in germination percentage and seedling growth. In conclusion, we find that plasma agriculture’s success is contingent on seed morphology, the types and concentrations of reactive species, and specific plasma characteristics. © 2023 by Begell House, Inc.

关键词： Atmospheric pressure

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Facile access to β-hydroxyl ketones via a cobalt-catalyzed ring-opening/hydroxylation cascade of cyclopropanols

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Chinese Chemical Letters 2023年第3期34卷 322-325页

作者： Shengxian Zhai Shuxian Qiu Shuangtao Yang Xingyuan Gao Xinyu Feng Chenzhe Yun Ning Han Yongsheng Niu Jing Wang Hongbin Zhai College of Chemistry&Environmental Engineering Anyang Institute of TechnologyAnyang 455000China Department of Chemistry and Material Science Engineering Technology Development Center of Advanced Materials&Energy Saving and Emission Reduction in Guangdong Colleges and UniversitiesGuangdong University of EducationGuangzhou 510303China State Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical Genomics Shenzhen Engineering Laboratory of Nano Drug Slow-ReleaseShenzhen Graduate School of Peking UniversityShenzhen 518055China Shenzhen Bay Laboratory Shenzhen 518055China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300071China

A cobalt-catalyzed ring-opening/hydroxylation cascade of highly strained cyclopropanols has been developed for the first time. The reaction was conducted under open-air atmosphere to afford a broad series of structurally diverse β-hydroxy ketones in moderate to good yields with high *** protocol features mild reaction conditions, simple operation, high-functional-group tolerance, facile scalability, and heterocycle compatibility.

关键词： Cobalt catalysis Ring-opening Cyclopropanol β-Hydroxy ketone Cascade reaction

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Monte Carlo-Based Identification of Electron and Proton Edges for Calibration of Miniaturized Tissue Equivalent Proportional Counter

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SSRN 2022年

作者： Eom, Mingi Youn, Sukwon Ye, Sung-Joon Program in Biomedical Radiation Sciences Department of Transdisciplinary Studies Graduate School of Convergence Science and Technology Seoul National University Seoul Korea Republic of Department of Applied Bioengineering Research Institute of Convergence Science Graduate School of Convergence Science and Technology Seoul National University Seoul Korea Republic of Advanced Institutes of Convergence Technology Seoul National University Suwon Korea Republic of

A miniaturized tissue equivalent proportional counter (mini-TEPC) cannot accommodate an internal alpha source for calibration. Instead, electron and proton edges on Monte Carlo (MC)-generated lineal energy spectra can be identified as makers for this purpose. A mini-TEPC of 1 mm-diameter and-length cylinder was assumed to be irradiated with 137Cs or 252Cf source and to have the tissue size of 1 or 2 µm. The electron edge marker, yδδ (maximum of second derivative of the fitted function) from Geant4 and MCNP6 was close to each other and comparable to the analytical values. The proton edges from the two codes were comparable, especially in yδδ but showed a difference from the analytical values. The lineal energy spectra from Geant4 and MCNP6 simulations were somewhat different in their peak locations. However, MC simulations of realistic detector and source geometry would provide practical channel positions of electron and proton edges for calibration of mini-TEPC. © 2022, The Authors. All rights reserved.

关键词： Electrons

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Surface Modification of 3D Printed Biomedical Scaffolds Through an Electron Beam Processe

Surface Modification of 3D Printed Biomedical Scaffolds Thro...

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IEEE International Conference on nano/Molecular Medicine and Engineering (nanoMED)

作者： Goeun Cha Jonghyeon Woo Jeongsik Noh Jongsung Park School of Advanced Science and Technology Convergence Graduate School Kyungpook National University Sangju Republic of Korea Department of Precision Mechanical Engineering Kyungpook National University Sangju Republic of Korea

ISBN: (数字)9798331516994

ISBN: (纸本)9798331517007

This study introduces a method for employing electron beam processing to effectuate both physical and chemical modifications to the surface of 3D printed biomedical scaffolds. Generally, 3D printed scaffolds exhibit certain limitations, including rough surface textures and dimensional inaccuracies, which hinder their applicability in medical contexts. To mitigate these issues, we implemented the electron beam technique to enhance surface smoothness and facilitate chemical alterations. The proposed method is not only efficient in polishing the surfaces of the printed scaffolds but also capable of processing a substantial number of samples within a brief timeframe. This technique holds potential for various biomedical implant devices and can be adapted for use with a range of metallic materials and polymer printing. Notably, the electron beam process described herein relies solely on heat treatment via electron application, thereby ensuring the complete elimination of any potential adverse effects that may arise during clinical trials related to the materials used.

关键词： Electric potential Electron beams Three-dimensional printing Surface roughness Rough surfaces Surface texture Reliability Surface finishing Surface treatment Chemicals

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Real-time monitoring of fast gas dynamics with a single-molecule resolution by frequency-comb-referenced plasmonic phase spectroscopy

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PhotoniX 2024年第1期5卷 357-372页

作者： Duy-Anh Nguyen Dae Hee Kim Geon Ho Lee San Kim Dong-Chel Shin Jongkyoon Park Hak-Jong Choi Seung-Woo Kim Seungchul Kim Young-Jin Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Science TownDaejeon 34141South Korea Department of Mechatronic Engineering Faculty of Mechanical EngineeringHo Chi Minh City University of Technology(HCMUT)Vietnam National UniversityHo Chi Minh CityVietnam Department of Cogno-Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241South Korea Department of Optics and Mechatronics Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241South Korea School of Mechanical and Aerospace Engineering Nanyang Technological University(NTU)50 Nanyang AvenueSingapore 639798Singapore Institute of Machinery and Materials Nano-Convergence Mechanical Systems Research DivisionKorea156Gajeongbuk-RoYuseong-GuDaejeon 34103South Korea

Surface plasmon resonance(SPR)sensors are based on photon-excited surface charge density oscillations confined at metal-dielectric interfaces,which makes them highly sensitive to biological or chemical molecular bindings to functional metallic *** nanostructures further concentrate surface plasmons into a smaller area than the diffraction limit,thus strengthening photon-sample ***,plasmonic sensors based on intensity detection provide limited resolution with long acquisition time owing to their high vulnerability to environmental and instrumental ***,we demonstrate fast and precise detection of noble gas dynamics at single molecular resolution via frequency-comb-referenced plasmonic phase *** photon-sample interaction was enhanced by a factor of 3,852 than the physical sample thickness owing to plasmon resonance and thermophoresis-assisted optical confinement *** utilizing a sharp plasmonic phase slope and a high heterodyne information carrier,a small atomic-density modulation was clearly resolved at 5 Hz with a resolution of 0.06 Ar atoms per nano-hole(in 10^(11)RIU)in Allan deviation at 0.2 s;a faster motion up to 200 Hz was clearly *** fast and precise sensing technique can enable the in-depth analysis of fast fluid dynamics with the utmost resolution for a better understanding of biomedical,chemical,and physical events and interactions.

关键词： Frequency comb nanohole array Single molecule detection Refractive index High resolution High speed Traceability to time standard

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Real-Time, AI-Guided Photodynamic Laparoscopy Enhances Detection in a Rabbit Model of Peritoneal Cancer Metastasis

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Cancer science 2025年第4期116卷 966-975页

作者： Rivera-Piza, Adriana Lee, Sung-Ho Lee, Hannah HeeJung Lee, Seungho Shin, Su-Jin Kim, Jaehyuk Park, Jong-Hyun Yu, Jae Eun Lee, Sang Won Park, Gyuri Wilson, Brian C. Kim, Hyoung-Il Yonsei-Dongsung Photodynamic Therapy Research Center Avison Biomedical Research Center Yonsei University College of Medicine Seoul South Korea Department of Surgery Yonsei University College of Medicine Seoul South Korea Department of Pathology Gangnam Severance Hospital Seoul South Korea CAE Group Health and Medical Equipment Business Samsung Electronics Co. Ltd. Seoul South Korea Department of Nano-Science and Technology Graduate School of Convergence Science and Technology of Seoul National University Seoul South Korea Yonsei Biomedical Research Institute Yonsei University College of Medicine Seoul South Korea Princess Margaret Cancer Centre University Health Network Toronto ON Canada Department of Medical Biophysics Faculty of Medicine University of Toronto Toronto ON Canada

Accurate diagnosis is essential for effective cancer treatment, particularly in peritoneal surface malignancies, where failure to detect metastatic lesions can mislead the treatment plan. This study assessed the diagnostic accuracy of staging laparoscopy using the integration of artificial intelligence (AI)-guided photodynamic diagnosis (PDD) with the photosensitizer Phonozen, activated at 405 nm in a rabbit model. To create peritoneal carcinomatosis, VX2 cells were inoculated laparoscopically into the peritoneum of female white New Zealand rabbits. Conventional and PDD-guided laparoscopy utilized a customized light source that emitted broad-spectrum white light or 405-nm blue light, respectively. The surgical procedure comprised a tripartite approach: exploration and labeling of suspected nodules under white-light visualization, identification of additional metastatic tumors under blue-excitation fluorescent light, and confirmatory open laparotomy to locate overlooked nodules by palpation. Our results showed that the initial experimental data from 371 nodules in 14 rabbits, comparing conventional diagnostic laparoscopy and PDD, showed increased detection sensitivity from 67% ± 1.9% (conventional) to 98% ± 0.7% (PDD) in the small-size nodule. In the second experimental data set from 265 nodules in 10 rabbits, the addition of a real-time AI algorithm further increased the sensitivity to 100% ± 0.0%. Combining PDD with AI enhances the detection of peritoneal cancer metastasis in staging laparoscopy. © 2025 The Author(s). Cancer science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association.

关键词： artificial intelligence laparoscopy peritoneal metastasis photodynamic diagnosis VX2 sarcoma

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Influence of conformational change of chain unit on the intrinsic negative thermal expansion of polymers

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Chinese Chemical Letters 2021年第4期32卷 1515-1518页

作者： Qiangsheng Sun Ke Jin Yuhui Huang Jia Guo Thanyada Rungrotmongkol Phornphimon Maitarad Changchun Wang State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science Fudan UniversityShanghai 200433.China Biocatalyst and Environmental Biotechnology Research Unit Department of BiochemistryFaculty of Science and Program in Bioinformatics and Computational BiologyGraduate SchoolChulalongkom UniversityBangkok 10330Thailand Research Center of Nano Science and Technology Shanghai UniversityShanghai 200444China

Negative thermal expansion(NTE) behavior has roused wide interest for the control of thermomechanical properties of functional *** NTE behaviors have been found in kinds of compounds,it remains challenging for polymers to achieve intrinsic NTE *** this work,we systematically studied the conformational change of dibenzocyclooctadiene(DBCOD) derivatives between chair(C) and twist-boat(TB) forms based on density-functional theo ry(DFT) calculations,and found clear evidence of the relationship between the structure of DBCOD units and the thermal contraction behavior of the related *** order to obtain the polymer with NTE property,two conditions should be met for the thermal contracting DBCOD related units as follows:(i) the TB conformation can turn into C conformation as the temperature increases,and(ii) the volume of C conformation is smaller than that of TB *** rule should offer a guidance to exploration of the new intrinsic NTE polymers in the future.

关键词： Negative thermal expansion Conformational change Polyarylamides Density-functional theory Dibenzocyclooctadiene

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Effect of molybdenum on interfacial properties of titanium carbide reinforced Fe composite

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Journal of Materials science & technology 2022年第12期107卷 252-258页

作者： Seungchan Cho Junghwan Kim Ilguk Jo Jae Hyun Park Jaekwang Lee Hyun-Uk Hong Bong Ho Lee Wook Ryol Hwang Dong-Woo Suh Sang-Kwan Lee Sang-Bok Lee Composites Research Division Korea Institute of Materials Science(KIMS)Changwon 51508South Korea Advanced Materials Engineering Dong-Eui UniversityBusan 47340South Korea Department of Aerospace and Software Engineering Gyeongsang National UniversityJinju 52828South Korea Department of Physics Pusan National UniversityBusan 46241South Korea Department of Materials Convergence and System Engineering Changwon National UniversityChangwon 51140South Korea Center for Core Research Facilities Daegu Gyeongbuk Institute of Science and TechnologyDaegu 42988South Korea School of Mechanical Engineering Gyeongsang National UniversityJinju 52828South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyGyeongbuk 37673South Korea

This study shows that the mechanical strength of the composite of Fe matrix and titanium carbide(Ti C)ceramic particles is significantly enhanced with addition of molybdenum(Mo) atoms. Ti C reinforced Fe(Fe-0.2C-7Mn) composites with and without Mo were fabricated by a liquid pressing infiltration(LPI)process and the effect of Mo on interfacial properties of TiC–Fe composite was investigated using atomic probe tomography(APT) analysis, molecular dynamics(MD) simulations, first-principle density functional theory(DFT), and thermodynamic calculations. First, DFT calculations showed that total energies of the Mo-doped Ti C–Fe superlattices strongly depend on the position of Mo defects, and are minimized when the Mo atom is located at the TiC/Fe interface, supporting the probable formation of MoC-like interphase at the TiC/Fe interface region. Then, APT analysis confirmed the DFT predictions by finding that about6.5 wt.% Mo is incorporated in the Ti C–Fe(Mo) composite and that sub-micrometer thick(Ti,Mo)C interphase is indeed formed near the interface. The MD simulations show that Mo atoms migrate to the Mo-free TiC–Fe interface at elevated temperatures and the mechanical strength of the interface is considerably enhanced, which is in good agreement with experimental observations.

关键词： Metal matrix composites(MMCs) Titanium carbide Fe matrix composite Infiltration Molybdenum Interfacial property

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SUV39H1-driven NFATc1 methylation is essential for the c-Cbl-mediated degradation of NFATc1 in an osteoclast lineage

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Genes & Diseases 2024年第4期11卷 86-89页

作者： Do-Won Jeong Hye-Jin Kim Jong-Wan Park Seulbee Lee Hyeryeon Jung Eugene C.Yi Nacksung Kime Yang-Sook Chun Department of Biomedical Sciences Seoul National University College of MedicineSeoul 03080Republic of Korea Department of Physiology Seoul National University College of MedicineSeoul 03080Republic of Korea Ischemic/Hypoxic Disease Institute Seoul National University College of MedicineSeoul 03080Republic of Korea Department of Molecular Medicine and Biopharmaceutical Sciences Graduate School of Convergence Science and Technology and College of Medicine Or College of PharmacySeoul National UniversitySeoul 03080Republic of Korea Department of Pharmacology Chonnam National University Medical SchoolGwangju 61469Republic of Korea

Bone undergoes continuous remodeling by tightly-coordinated actions of bone-resorbing osteoclasts and boneforming osteoblasts.1 Recent studies document that the dysregulation of histone methylation profiles is associated with the progression of ***,the specific epigenetic modifiers are incompletely *** this study,we demonstrate an inhibitory role of a variegation 3-9 homolog 1(SUV39H1)in osteoclast formation.

关键词： osteoclast remodeling incomplete

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