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Observational Diagnosis of Cloud Phase in the Winter Antarctic Atmosphere for Parameterizations in Climate Models

Advances in Atmospheric Sciences 2010年第6期27卷 1233-1245页

作者： Yong-Sang choi Chang-Hoi HO Sang-woo KIM Richard S.LINDZEN Department of Environmental Science and Engineering Ewha Womans University Department of Earth Atmospheric and Planetary SciencesMassachusetts Institute of Technology School of Earth and Environmental Sciences Seoul National University

The cloud phase composition of cold clouds in the Antarctic atmosphere is explored using data from the Moderate Resolution Imaging Spectroradiometer （MODIS） and Cloud-Aerosol Lidar with Orthogonal Polarization （CALIOP） instruments for the period 2000-2006. We used the averaged fraction of liquid-phase clouds out of the total cloud amount at the cloud tops since the value is comparable in the two measurements. MODIS data for the winter months （June, July, and August） reveal liquid cloud fraction out of the total cloud amount significantly decreases with decreasing cloud-top temperature below 0°C. In addition, the CALIOP vertical profiles show that below the ice clouds, low-lying liquid clouds are distributed over ～20% of the area. With increasing latitude, the liquid cloud fraction decreases as a function of the local temperature. The MODIS-observed relation between the cloud-top liquid fraction and cloud-top temperature is then applied to evaluate the cloud phase parameterization in climate models, in which condensed cloud water is repartitioned between liquid water and ice on the basis of the grid point temperature. It is found that models assuming overly high cut-offs （ -40°C） for the separation of ice clouds from mixed-phase clouds may significantly underestimate the liquid cloud fraction in the winter Antarctic atmosphere. Correction of the bias in the liquid cloud fraction would serve to reduce the large uncertainty in cloud radiative effects.

关键词： cloud phase mixed-phase clouds polar cloud cloud radiative effect cloud parameterization

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Cardiac metastasis from colorectal cancer:A case report

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World Journal of Gastroenterology 2009年第21期15卷 2675-2678页

作者： Pyong Wha choi Chul Nam Kim Sun Hee Chang woo Ik Chang Chang Young Kim Hyun Min choi Department of Surgery Ilsan Paik HospitalInje University College of Medicine Department of Diagnostic Pathology Ilsan Paik HospitalInje University College of Medicine Department of Chest Surgery Ilsan Paik HospitalInje University College of Medicine Department of Internal Medicine Ilsan Paik HospitalInje University College of Medicine

The heart is an unusual site of metastasis from any malignancy. We report a case of cardiac metastasis from colorectal cancer. A 70-year-old woman was referred with a presumptive diagnosis of sigmoid colon cancer with cardiac myxoma. Two-dimensional echocardiography showed a 4 cm x 4.5 cm mobile mass on the lateral right atrial wall, and computed tomography revealed a low attenuated Iobulating mass in the right atrium. The patient underwent anterior resection for sigmoid colon cancer （T4N2）. Thereafter, she experienced progressive shortness of breath. Therefore, a cardiac operation was performed 2 wk after the colorectal operation. Histological examination revealed adenocarcinoma, which was identical to the primary lesion. Although two- dimensional echocardiography has become the diagnostic test of choice for detecting cardiac tumors, in patients with colorectal cancer showing a cardiac mass, further diagnostic evaluation such as a magnetic resonance imaging might be necessary.

关键词： Heart Cardiac metastasis Colorectalcancer Atrial myxoma Magnetic resonance imaging

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Dual-light emitting 3D encryption with printable fluorescent-phosphorescent metal-organic frameworks

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Light(Science & Applications) 2023年第10期12卷 2172-2186页

作者： Jin woo Oh Seokyeong Lee Hyowon Han Omar Allam Ji il choi Hyeokjung Lee Wei Jiang Jihye Jang Gwanho Kim Seungsoo Mun Kyuho Lee Yeonji Kim Jong woong Park Seonju Lee Seung Soon Jang Cheolmin Park Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea The George W.woodruff School of Mechanical Engineering Georgia Institute of Technology801 Ferst DriveAtlantaGA 30332-0405USA School of Materials Science and Engineering Georgia Institute of Technology771 Ferst DriveAtlantaGA 30332-0245USA Om Spin Convergence Research Center Korea Institute of Science and Technology(KIST)Seoul02792Republic of Korea

Optical encryption technologies based on room-temperature light-emitting materials are of considerable ***,we present three-dimensional(3D)printable dual-light-emitting materials for high-performance optical pattern *** are based on fluorescent perovskite nanocrystals(NCs)embedded in metal-organic frameworks(MOFs)designed for phosphorescent host-guest ***,perovskite-containing MOFs emit a highly efficient blue phosphorescence,and perovskite NCs embedded in the MOFs emit characteristic green or red fluorescence under ultraviolet(UV)*** dual-light-emitting MOFs with independent fluorescence and phosphorescence emissions are employed in pochoir pattern encryption,wherein actual information with transient phosphorescence is efficiently concealed behind fake information with fluorescence under UV ***,a 3D cubic skeleton is developed with the dual-light-emitting MOF powder dispersed in 3D-printable polymer filaments for 3D dual-pattern *** article outlines a universal principle for developing MOF-based room-temperature multi-light-emitting materials and a strategy for multidimensional information encryption with enhanced capacity and security.

关键词： perovskite light pattern

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Paradoxical vocal fold motion masquerading as post-anesthetic respiratory distress:A case report

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World Journal of Clinical Cases 2023年第10期11卷 2349-2354页

作者： Jongyoon Baek Dae-Lim Jee Yoon Seok choi Sang woo Kim Eun Kyung choi Department of Anesthesiology and Pain Medicine Yeungnam University College of MedicineDaegu 42415South Korea Department of Otorhinolaryngology-Head and Neck Surgery Yeungnam University College of MedicineDaegu 42415South Korea Department of Neurosurgery Yeungnam University College of MedicineDaegu 42415South Korea

BACKGROUND Functional vocal cord disorders can be a differential diagnosis for postoperative upper airway obstruction requiring urgent ***,this may be unfamiliar to anesthesiologists who would favor inappropriate airway intervention and increased *** SUMMARY A 61-year-old woman underwent cervical laminectomy,followed by laparoscopic cholecystectomy 10 mo *** adequate reversal of neuromuscular blockade,the patient experienced repetitive respiratory difficulty with inspiratory stridor after *** the second operation,the patient was diagnosed with paradoxical vocal fold motion(PVFM)by an otolaryngologist based on the clinical features and fiberoptic bronchoscopy results,and the patient was successfully *** PVFM should be considered a differential diagnosis if a patient presents with stridor after general anesthesia.

关键词： Anesthesiology Vocal fold Paradoxical motion Postoperative respiratory distress Case report

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Heterostructures in two-dimensional colloidal metal chalcogenides:Synthetic fundamentals and applications

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Nano Research 2019年第8期12卷 1750-1769页

作者： Yuho Min Eunmi Im Geon-Tae Hwang Jong-woo Kim Cheol-woo Ahn Jong-Jin choi Byung-Dong Hahn Joon-Hwan choi woon-Ha Yoon Dong-Soo Park Dong Choon Hyun Geon Dae Moon Functional Ceramics Department Powder & Ceramics DivisionKorea Institute of Materials Science (KIMS)ChangwonGyeongnam51508Republic of Korea Department of Polymer Science and Engineering Kyungpook National UniversityDaegu41566Republic of Korea Dongrtam Regional Division Korea Institute of Industrial TechnologyBusan46938Republic of Korea

As a new class of two-dimensional materials, two-dimensional (2D) heterostructures constructed from metal chalcogenides (MCs) have been gaining tremendous attention due to their unprecedented physical and chemical phenomena, mainly originated from their distinct structural features such as composition, architecture type, spatial arrangement of each component, crystal structure, exposed facet and interface, dimensionality in their heterostructures. Towards the realization of practical applications, synthetic approaches need a rational design with a variety of architecture types including laterally-combined, vertically-aligned, and conformally-coated 2D MC heterostructures. Among various synthetic routes, solution-based synthesis is thought of as an alternative to fabrication through high-cost setups since it can control those structural features in a cheap fashion. This review presents recent progress on solution-based synthesis to produce various 2D MC heterostructures with a focus on the synthetic fundamentals in terms of thermodynamic and kinetic aspects related to the growth mechanism. Four different synthetic approaches are reviewed: seeded growth, cation exchange reaction, colloidal atomic layer deposition, direct synthesis including one-step process and modified electrochemical method. We also provide some representative applications of 2D MC heterostructures and their hybrid composites in various fields including optoelectronics, thermoelectrics, catalysis, and battery. Finally, we offer an insight into challenges and future directions in a synthetic improvement of 2D MC heterostructures.

关键词： metal chalcogenide heterostructure anisotropic nanomaterials two-dimensional (2D) nanomaterials solution-based synthesis

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Smart Proactive Caching Scheme for Fast Authenticated Handoff in Wireless LAN

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Journal of Computer Science & Technology 2007年第3期22卷 476-480页

作者： Sin-Kyu Kim Jae-woo choi Dae-Hun Nyang Gene-Beck Hahn Joo-Seok Song Electronics Telecommunications Research Institute Daejeon Korea Graduate School of Information Technology and Telecommunications Inha University IncheonKorea Mobile Communication Technology Research Lab LG Electronics AnyangKorea Department of Computer Science Yonsei University SeoulKorea

Handoff in IEEE 802.11 requires the repeated authentication and key exchange procedures, which will make the provision of seamless services in wireless LAN more difficult. To reduce the overhead, the proactive caching schemes have been proposed. However, they require too many control packets delivering the security context information to neighbor access points. Our contribution＇ is made in two-fold： one is a significant decrease in the number of control packets for proactive caching and the other is a superior cache replacement algorithm.

关键词： wireless local area network (LAN) security authentication simulation

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Nanocomposite quasi-solid-state electrolyte for high-safety lithium batteries

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Nano Research 2017年第9期10卷 3092-3102页

作者： Hyunji choi Hyun woo Kim Jae-Kwang Kim Young Jun Lim Youngsik Kim Jou-Hyeon Ahn School of Energy & Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan 689-798 Republic of Korea Department of Solar & Energy Engineering Cheongju University Cheongju Chungbuk 28503 Republic of Korea School of Energy & Chemical Engineering and Research Institute for Green Energy Convergence Technology Gyeongsang National University 900 Gajwa-dong Jinju 660-70 I Republic of Korea

Rechargeable lithium batteries are attractive power sources for electronic devices and are being aggressively developed for vehicular use. Nevertheless, problems with their safety and reliability must be solved for the large-scale use of lithium batteries in transportation and grid-storage applications. In this study, a unique hybrid solid-state electrolyte composed of an ionic liquid electrolyte (LiTFSI/Pyr14TFSI) and BaTiO3 nanosize ceramic particles was prepared without a polymer. The electrolyte exhibited high thermal stability, a wide electrochemical window, good ionic conductivity of 1.3 × 10−3 S·cm−1 at 30 °C, and a remarkably high lithium-ion transference number of 0.35. The solid-state LiFePO4 cell exhibited the best electrochemical properties among the reported solid-state batteries, along with a reasonable rate capability. Li/LiCoO2 cells prepared using this nanocomposite solid electrolyte exhibited high performance at both room temperature and a high temperature, confirming their potential as lithium batteries with enhanced safety and a wide range of operating temperatures.

关键词： nanocomposition solidified ionic liquid shell charge space safety lithium battery

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Application of 3D bioprinting in the prevention and the therapy for human diseases

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Signal Transduction and Targeted Therapy 2021年第6期6卷 1681-1697页

作者： Hee-Gyeong Yi Hyeonji Kim Junyoung Kwon Yeong-Jin choi Jinah Jang Dong-woo Cho Department of Rural and Biosystems Engineering College of Agriculture and Life SciencesChonnam National University77 Yongbong-RoGwangju 61186Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-RoPohangKyungbuk 37673Korea Department of Advanced Biomaterials Research Korea Institute of Materials Science(KIMS)797 ChangwondaeroChangwonKyungnam 51508Korea Department of Convergence IT Engineering POSTECH77 Cheongam-RoPohangKyungbuk 37673Korea Institute of Convergence Science Yonsei University50 Yonsei-RoSeoul 03722Korea

Rapid development of vaccines and therapeutics is necessary to tackle the emergence of new pathogens and infectious *** speed up the drug discovery process,the conventional development pipeline can be retooled by introducing advanced in vitro models as alternatives to conventional infectious disease models and by employing advanced technology for the production of medicine and cell/drug delivery *** this regard,layer-by-layer construction with a 3D bioprinting system or other technologies provides a beneficial method for developing highly biomimetic and reliable in vitro models for infectious disease *** addition,the high flexibility and versatility of 3D bioprinting offer advantages in the effective production of vaccines,therapeutics,and relevant delivery ***,we discuss the potential of 3D bioprinting technologies for the control of infectious *** also suggest that 3D bioprinting in infectious disease research and drug development could be a significant platform technology for the rapid and automated production of tissue/organ models and medicines in the near future.

关键词： printing prevention introducing

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A Self‑Regenerable Fiber Sloughing Its Heavy Metal Skin for Ultrahigh Separation Capability

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Advanced Fiber Materials 2023年第6期5卷 2127-2142页

作者： Youngkyun Jung Ji Su Park Kyung‑Won Jung Young Gun Ko Jae‑woo choi Center for Water Cycle Research Korea Institute of Science and TechnologySeoul 02792Republic of Korea Center for Bionics Korea Institute of Science and TechnologySeoul 02792Republic of Korea Department of Chemical Engineering and Materials Science Sangmyung UniversitySeoul 03016Republic of Korea Division of Energy&Environment Technology KIST SchoolKorea University of Science and Technology(UST)Seoul 02792Republic of Korea

Developing efficient separation materials for recovering metal resources from aqueous environments is crucial for the sustainable water–food–energy nexus,which addresses the interdependence between energy production,water production,and energy *** material-based separation processes have demonstrated outstanding ***,electric energy and chemicals are used to frequently replace the separation materials used in such processes owing to their short life *** study presents a methodology for designing the self-regenerable fiber(SRF)according to the types of metals through a self-regeneration *** SRF can semi-permanently recover the metal resources from water through a repetitive adsorption–crystallization–detachment process of metal ions on its *** ionic metal resources are adsorbed and crystallized with the counter-anions on the SRF ***,the metal crystals are self-detached from the SRF surface by the collision between the crystals and curvature and non-sticky surface of the ***,a module containing the SRF maintains its metal recovery capability even during continuous injection of the metal solution without its *** findings highlight the significance of interfacial engineering and further guide the rational design of energy/environmentally friendly resource recovery modules.

关键词： Self-regeneration model Self-regenerable fiber Semi-permanent adsorption capability Metal crystal growth-detachment

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Individual having a parent with early-onset gastric cancer may need screening at younger age

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World Journal of Gastroenterology 2015年第15期21卷 4592-4598页

作者： Hee-Won Kwak il Ju choi Chan Gyoo Kim Jong Yeul Lee Soo-Jeong Cho Bang wool Eom Hong Man Yoon Jungnam Joo Keun Won Ryu Young-woo Kim Center for Gastric Cancer National Cancer Center Biometric Research Branch National Cancer Center

AIM: To evaluate whether individuals with gastric cancer(GC) are diagnosed earlier if they have firstdegree relatives with ***: A total of 4282 patients diagnosed with GC at National Cancer Center Hospital from 2002 to 2012 were enrolled in this retrospective study. We classified the patients according to presence or absence of first-degree family history of GC and compared age at diagnosis and clinicopathologic characteristics. In addition, we further classified patients according to specific family member with GC(father, mother, sibling, or offspring) and compared age at GC diagnosis among these patient groups. Baseline characteristics were obtained from a prospectively collected database. Information about the family member's age at GC diagnosis was obtained by ***: A total of 924 patients(21.6%) had a firstdegree family history of GC. The mean age at GC diagnosis in patients having paternal history of GC was 54.4 ± 10.4 years and was significantly younger than in those without a first-degree family history(58.1 ± 12.0 years, P ily member having early-onset GC(ily history of GC(both P ily history need to start screening earlier.

关键词： Gastric cancer Family history Family member Age at diagnosis Screening

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