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2D Spatial-Temporal Simulation of GPR Penetration in the 200-400MHz Band for Detecting Voids and Entrapped Persons in Multi-Layered Collapsed Building Structure

2D Spatial-Temporal Simulation of GPR Penetration in the 200...

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IEEE International Conference on Radar

作者： Seungeon Song Gyeongtaeg Yang Bongseok Kim Sangdong Kim Jonghun Lee Advanced Radar Technology Lab. Convergence Research Center for Future Automotive Technology DGIST(Daegu Gyengbuk Institute of Science & Technnology) Department of Interdisciplinary Engineering Graduate School DGIST

ISBN: (数字)9798350362381

ISBN: (纸本)9798350362398

This paper presents a foundational framework towards designing a portable, site-specific radar system for use in building collapse scenarios, focusing on the detection of voids beneath debris and analyzing GPR signals for locating hidden survivors. To analyze GPR signal characteristics, we employed the Finite Difference Time Domain (FDTD) method, utilizing simulation tools such as gprMax and High Frequency Structure Simulator (HFSS) to model electromagnetic wave propagation within intricate multilayered debris structures. This paper examines the GPR A-scan, B-scan(radargram) and signal propagations across various configurations of collapse site structures, ranging from solely soil compositions to those incorporating thin or thick concrete and wooden layers, each with embedded voids and entrapped persons inside *** work aims to enhance the efficiency of survivor search and rescue operations at collapse sites, laying down a theoretical basis for validating experiments designed by real-world collapse scenarios. By scrutinizing the influence of GPR's operating frequency and the structural composition of debris on detection performance, the findings serve as crucial foundational data for tailoring GPR design and understanding detection characteristics pertinent to real-world conditions.

关键词： Disasters Buildings Radar detection Focusing Soil Distance measurement High frequency Electromagnetic propagation Time-domain analysis Finite difference methods

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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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POLYELECTROLYTE-GATED VERTICAL SCHOTTKY-BARRIER TRANSISTORS

POLYELECTROLYTE-GATED VERTICAL SCHOTTKY-BARRIER TRANSISTORS

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第七届高分子化学国际学术研讨会

作者： Jeong Ho Cho Youn Sang Kim SKKU Advanced Institute of Nanotechnology (SAINT) 2School of Chemical EngineeringSungkyunkwan University Program in Nano Science and Technology Graduate School of Convergence Science and TechnologySeoul National University

We demonstrate a new device architecture for flexible vertical Schottky barrier(SB)transistors and logic gates based on graphene–organic semiconductor–metal heterostructures and ion gel gate *** vertical SB transistor structure was formed by(i)vertically sandwiching a benchmark p-type pentacene or n-type N,N’-dioctyl-3,4,9,10-perylenedicarboximide(PTCDI-C8)organic semiconductor

关键词： POLYELECTROLYTE-GATED VERTICAL SCHOTTKY-BARRIER TRANSISTORS

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Direct Anodic Electrografting of Osmium Complexes on Indium Tin Oxide

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SSRN 2024年

作者： Lee, Haeyeon Go, Su Yong Kim, Chae Yun Kim, Eun Joong Kang, Chung Mu Chung, Taek Dong Department of Chemistry Seoul National University Seoul08826 Korea Republic of Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University Suwon16229 Korea Republic of Advanced Institute of Convergence Technology Suwon16229 Korea Republic of

Indium tin oxide (ITO) is a widely used electrode material in electrochemical biosensors owing to its beneficial characteristics such as transparency and chemical inertness. The exceptionally sluggish kinetics of heterogeneous electron transfer in ITO provides an exceptionally low background current, making electron mediators essential for electrochemical sensors. However, the chemical modification of ITO with molecular mediators is still challenging. Few straightforward and credible methods are available to obtain sufficiently thin mediator films firmly anchored on the ITO without losing its inherent benefits, including low background current and transparency. This study demonstrated the anodic electrografting of three osmium complexes, which allowed the formation of molecular mediator monolayers on ITO. The densely packed monolayer of osmium complexes retained their reversible redox processes over hundreds of potential cycles. We confirmed electron mediation by the modified electrodes for aminophenol oxidation, suggesting a simple protocol for developing ITO-based biosensors functionalized with molecular mediators. © 2024, The Authors. All rights reserved.

关键词： Tin oxides

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SU-C-BRB-06: Utilizing 3D Scanner and Printer for Dummy Eye-Shield: Artifact-Free CT Images of Tungsten Eye-Shield for Accurate Dose Calculation

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Medical Physics 2015年第6PART2期42卷 3194-3195页

作者： J Park J Lee H Kim I Kim S Ye Program in Biomedical Radiation Sciences Department of Transdisciplinary Studies Graduate School of Convergence Science and Technology Seoul National University Seoul Korea Institute of Radiation Medicine Seoul National University Medical Research Center Seoul Korea Department of Radiation Oncology Seoul National University Hospital Seoul Korea Interdisciplinary Program in Radiation Applied Life Science Seoul National University College of Medicine Seoul Korea Advanced Institutes of Convergence Technology Seoul National University Suwon Korea

Purpose: To evaluate the effect of a tungsten eye-shield on the dose distribution of a patient. Methods: A 3D scanner was used to extract the dimension and shape of a tungsten eye-shield in the STL format. Scanned data was transferred into a 3D printer. A dummy eye shield was then produced using bio-resin (3D systems, VisiJet M3 Proplast). For a patient with mucinous carcinoma, the planning CT was obtained with the dummy eye-shield placed on the patient's right eye. Field shaping of 6 MeV was performed using a patient-specific cerrobend block on the 15 × 15 cm 2 applicator. The gantry angle was 330° to cover the planning target volume near by the lens. EGS4/BEAMnrc was commissioned from our measurement data from a Varian 21EX. For the CT-based dose calculation using EGS4/DOSXYZnrc, the CT images were converted to a phantom file through the ctcreate program. The phantom file had the same resolution as the planning CT images. By assigning the CT numbers of the dummy eye-shield region to 17000, the real dose distributions below the tungsten eye-shield were calculated in EGS4/DOSXYZnrc. In the TPS, the CT number of the dummy eye-shield region was assigned to the maximum allowable CT number (3000). Results: As compared to the maximum dose, the MC dose on the right lens or below the eye shield area was less than 2%, while the corresponding RTP calculated dose was an unrealistic value of approximately 50%. Conclusion: Utilizing a 3D scanner and a 3D printer, a dummy eye-shield for electron treatment can be easily produced. The artifact-free CT images were successfully incorporated into the CT-based Monte Carlo simulations. The developed method was useful in predicting the realistic dose distributions around the lens blocked with the tungsten shield.

关键词： Computed tomography Tungsten 3D printing Image scanners Three dimensional image processing Monte Carlo methods Medical image artifacts Cancer Field shaping

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Advancing hybrid quantum-classical algorithms via mean operators

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Physical Review A 2023年第1期108卷 L010401-L010401页

作者： Donggyu Kim Pureum Noh Hyun-Yong Lee Eun-Gook Moon Department of Physics Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Korea Department of Applied Physics Graduate School Korea University Sejong 30019 Korea Division of Display and Semiconductor Physics Korea University Sejong 30019 Korea Interdisciplinary Program in E·ICT-Culture-Sports Convergence Korea University Sejong 30019 Korea

Hybrid quantum-classical algorithms have been suggested to control the quantum entanglement of many-body systems in noisy intermediate-scale quantum technology, and yet their applicability is limited by the numbers of qubits and quantum operations. Here, we propose a mean-operator theory which overcomes limitations by combining the advantages of hybrid algorithms and standard mean-field theory. We demonstrate that an introduction of a mean operator prepares an entangled target many-body state with a significantly reduced number of quantum operations. We also show that a class of mean operators is expressed as time-evolution operators, which indicates that our theory is directly applicable to quantum simulations with Rydberg atoms and trapped ions.

关键词： Atom & ion trapping & guiding Quantum algorithms Quantum phase transitions Quantum simulation Strongly correlated systems Ultracold gases Symmetries in condensed matter Tensor network methods Variational wave functional methods

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Wearable Resonator for In-Vivo Electron Paramagnetic Resonance Tooth Dosimetry

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SSRN 2024年

作者： Ye, Sung-Joon Koo, Chang Uk Oh, Jeonghun Choi, Kwon Program in Biomedical Radiation Sciences Department of Transdisciplinary Studies Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Research Institute for Convergence Science Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Department of Applied Bioengineering Graduate School of Convergence Science and Technology Seoul National University Seoul08826 Korea Republic of Advanced Institutes of Convergence Technology Seoul National University Suwon16229 Korea Republic of Biomedical Research Institute Seoul National University Hospital Seoul03080 Korea Republic of

Tooth radiation dosimetry using an in-vivo electron paramagnetic resonance (EPR) spectrometer serves as a triage method for victims in large-scale radiation emergencies, such as the Fukushima and Chernobyl accidents. However, the victim’s breathing and movement during in-vivo measurements cause signal loss and uncertainty in the radiation-induced signal (RIS). This study aims to address these issues by developing a wearable resonator for a tooth. Using ANSYS HFSS, the dimensions and configuration of an attachable surface coil were optimized by calculating the magnetic field distribution in the enamel volume of a 3D incisor model. The magnetic energy concentration on the tooth enamel was maximized by the attachable surface coil, which had a 5 mm inner diameter and a 0.7 mm trace width at a given microwave power. The configured wearable resonator produced a constant RIS amplitude with a ±2.0% variation from an exposed tooth sample, even with a 2 mm movement along the central axis. Additionally, secure fixation of the wearable resonator resulted in significant stability, showing a relatively low uncertainty of 1.2% in the RIS amplitude. The wearable resonator also achieved an ~8.4% increase in RIS amplitude by concentrating more magnetic energy on the tooth sample compared to a conventional rigid resonator. This enhancement improved the accuracy and sensitivity of in-vivo tooth dosimetry. In conjunction with an automatic control circuit (ACC), the wearable resonator acquired undistorted in-vivo EPR spectra, thereby significantly reducing the need for manual intervention to reset the device due to the in-vivo motion. This combination of the wearable resonator and ACC effectively established a motion compensation system for in-vivo EPR tooth *** in Biomedical Radiation sciences, Department of Transdisciplinary Studies, graduate School of convergence science and technology, Seoul National University, Seoul 08826, Republic of KoreabResearch Institute for Con

关键词： Dosimetry

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Experimental selection and verification of maximum-heart-rate formulas for use with karvonen formula

Experimental selection and verification of maximum-heart-rat...

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10th International Conference on Informatics in Control, Automation and Robotics, ICINCO 2013

作者： She, Jinhua Nakamura, Hitoshi Makino, Koji Ohyama, Yasuhiro Hashimoto, Hiroshi Wu, Min Graduate School of Bionics Computer and Media Sciences Tokyo University of Technology 1404-1 Katakura Hachioji Tokyo 192-0982 Japan Interdisciplinary Graduate School of Medical and Engineering University of Yamanashi 4-3-11 Takeda Kofu 400-8511 Japan Master Program of Innovation for Design and Engineering Advanced Institute of Industrial Technology Shinagawa Tokyo 140-0011 Japan School of Information Science and Engineering Central South University Changsha 410083 China

ISBN: (纸本)9789898565716

Maximum heart rate (MHR) is commonly used to estimate exercise intensity with the Karvonen formula, and there are several methods of calculating it. In this study, we used pedaling experiments on a cycle ergometer to evaluate methods of determining MHR in order to select the ones most suitable for the Karvonen formula. In the experiments, 43 subjects rode an aerobike. The results show that, for people in their 20s, two methods are suitable for estimating exercise intensity with the Karvonen formula. The main physical parameters affecting exercise intensity were also extracted, based on the experimental results.

关键词： Heart

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Silicone breast implant modification review: Overcoming capsular contracture

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Biomaterials Research 2018年第1期22卷 319-327页

作者： Shin, Byung Ho Kim, Byung Hwi Kim, Sujin Lee, Kangwon Choy, Young Bin Heo, Chan Yeong Seoul National University College of Medicine Department of Biomedical Engineering Seoul 03080 South Korea Seoul National University Department of Transdisciplinary Studies Graduate School of Convergence Science and Technology Seoul 08826 South Korea Seoul National University Interdisciplinary Program for Bioengineering College of Engineering Seoul 08826 South Korea Seoul National University Department of Plastic and Reconstructive Surgery College of Medicine Seoul 03080 South Korea Seoul National University Bundang Hospital Department of Plastic and Reconstructive Surgery Seongnam 13620 South Korea Seoul National University Institute of Medical and Biological Engineering Medical Research Center Seoul 03080 South Korea Advanced Institutes of Convergence Technology Suwon Gyeonggi-do 16229 South Korea

Background: Silicone implants are biomaterials that are frequently used in the medical industry due to their physiological inertness and low toxicity. However, capsular contracture remains a concern in long-term transplantation. To date, several studies have been conducted to overcome this problem. This review summarizes and explores these trends. Main body: First, we examined the overall foreign body response from initial inflammation to fibrosis capsule formation in detail and introduced various studies to overcome capsular contracture. Secondly, we introduced that the main research approaches are to inhibit fibrosis with anti-inflammatory drugs or antibiotics, to control the topography of the surface of silicone implants, and to administer plasma treatment. Each study examined aspects of the various mechanisms by which capsular contracture could occur, and addressed the effects of inhibiting fibrosis. Conclusion: This review introduces various silicone surface modification methods to date and examines their limitations. This review will help identify new directions in inhibiting the fibrosis of silicone implants. © 2018 The Author(s).

关键词： Capsular contracture Fibrosis Foreign body reaction Inflammation Modification Silicone implant

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Application of CT simulation technique for virtual ultra-low-dose trial in CT colonography

Application of CT simulation technique for virtual ultra-low...

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4th International Workshop on Computational and Clinical Applications in Abdominal Imaging, Held in Conjunction with the 15th International Conference on Medical Image Computing and Computer-Assisted Intervention, MICCAI 2012

作者： Kim, Chang Won Kim, Jong Hyo Interdisciplinary Program of Bioengineering Seoul National University College of Engineering San 56-1 Sillim-dong Gwanak-gu Seoul 151-742 Korea Republic of Department of Radiology Seoul National University College of Medicine Seoul 110-744 Korea Republic of Interdisciplinary Program in Radiation Applied Life Science Seoul National University College of Medicine Seoul 110-744 Korea Republic of Institute of Radiation Medicine Seoul National University Medical Research Center 101 Daehangno Jongno-gu Seoul 110-744 Korea Republic of Department of Intelligent Convergence Systems Graduate School of Convergence Science and Technology Seoul National University 864-1 Iui-dong Yeongtong-gu Suwon-si Gyeonggi-do 443-270 Korea Republic of

ISBN: (纸本)9783642336119

A low-dose CT simulation technique is presented which might allow for a virtual ultra-low-dose trial in CT colonography without requiring raw sinogram data. A virtual sinogram is generated by performing the line integral of the CT number-based attenuation value with use of the CT scan parameters available in the DICOM header and in the literature. A separate noise sinogram is generated with use of a noise model, which incorporates the X-ray photon flux depending on the mAs, system electronic noise, and virtual sinogram. A synthetic noise CT image is generated by application of the filtered back projection of the noise sinogram with use of an appropriate filter that depends on the reconstruction kernel of the original CT. Finally, a simulated low-dose CT image is generated by addition of the CT data for the synthetic noise to the original CT data. Clinical CT colonography images with and without fecal tagging were used as simulation input and 50%, 25%, and 12.5% dose images were generated and evaluated. Our results suggest that the proposed CT simulation technique has potential for application in virtual ultra-low-dose trial in CT colonography in which an unlimited number of scan protocols could be performed without repetition of the real CT exposure to the patients. © 2012 Springer-Verlag.

关键词： Computerized tomography

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