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Inter-comparison of the Infrared Channels of the Meteorological Imager Onboard COMS and Hyperspectral IASI Data

Advances in Atmospheric Sciences 2015年第7期32卷 979-990页

作者： Dohyeong kim Myoung-hwan AHN Minjin CHOI National Meteorological Satellite Center of the Korea Meteorological Administration Department of Atmospheric Science and Engineering Ewha Womans University

The successful launch and commissioning of the first geostationary meteorological satellite of Korea has the potential to enhance earth observation capability over the Asia Pacific region. Although the specifications of the payload, the mete- orological imager （MI）, have been verified during both ground and in-orbit tests, there is the possibility of variation and/or degradation of data quality due to many different reasons, such as the accumulation of contaminants, the aging of instrument components, and unexpected external disturbance. Thus, for better utilization of MI data, it is imperative to continuously monitor and maintain the data quality. As a part of such activity, this study presents an inter-calibration, based on the Global Space-based Inter-Calibration System （GSICS）, between the MI data and the high quality hyperspectral data from the In- frared Atmospheric Sounding Interferometer （IASI） of the Metop-A satellite. Both sets of data, acquired for three years from April 2011 to March 2014, are processed to prepare the matchup dataset, which is spatially collocated, temporally concurrent, angularly coincident, and spectrally comparable. The results show that the MI data are stable within the specifications and show no significant degradation during the study period. However, the water vapor channel shows a rather large bias value of -0.77 K, with a root-mean-square difference （RMSD） of around 1.1 K, which is thought to be due to the shift in the spectral response function. The shortwave channel shows a maximum RMSD of around 1.39 K, mainly due to the coarse digitization at the lower temperature. The inter-comparison results are re-checked through a sensitivity analysis with different sets of threshold values used for the matchup dataset. Based on this, we confirm that the overall quality of the MI data meets the user requirements and maintains the expected performance, although the water vapor channel requires further investigation.

关键词： meteorological imager inter-comparison instrument long-term stability water vapor channel

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Robust and Reusable Fuzzy Extractors from Non-Uniform Learning with Errors Problem

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Computers, Materials & Continua 2023年第1期74卷 1985-2003页

作者： Joo Woo Jonghyun kim Jong hwan Park Graduate School of Information Security Korea UniversitySeoul02841Korea Department of Computer Science Sangmyung UniversitySeoul03016Korea

Afuzzy extractor can extract an almost uniformrandom string from a noisy source with enough entropy such as biometric *** reproduce an identical key from repeated readings of biometric data,the fuzzy extractor generates a helper data and a random string from biometric data and uses the helper data to reproduce the random string from the second *** 2013,Fuller et *** a computational fuzzy extractor based on the learning with errors *** construction,however,can tolerate a sub-linear fraction of errors and has an inefficient decoding algorithm,which causes the reproducing time to increase *** 2016,Canetti et *** a fuzzy extractor with inputs from low-entropy distributions based on a strong primitive,which is called digital ***,their construction necessitates an excessive amount of storage space for the helper data,which is stored in authentication *** on these observations,we propose a new efficient computational fuzzy extractorwith small size of helper *** scheme supports reusability and robustness,which are security notions that must be satisfied in order to use a fuzzy extractor as a secure authentication method in real ***,it conceals no information about the biometric data and thanks to the new decoding algorithm can tolerate linear *** on the non-uniform learning with errors problem,we present a formal security proof for the proposed fuzzy ***,we analyze the performance of our fuzzy extractor scheme and provide parameter sets that meet the security *** a result of our implementation and analysis,we show that our scheme outperforms previous fuzzy extractor schemes in terms of the efficiency of the generation and reproduction algorithms,as well as the size of helper data.

关键词： Fuzzy extractor reusability robustness biometric authentication non-uniform learning with errors

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Electrochemical characteristics of Al-Mg and Al-Mg-Si alloy in sea water

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中国有色金属学会会刊：英文版 2012年第S3期22卷 881-886页

作者： Seong-jong kim Seung-jun LEE Jae-yong JEONG Kyu-hwan kim Division of Marine Engineering Mokpo Maritime University

Among Al alloys,particularly 5000 series Al Mg and 6000 series Al Mg Si often used as marine materials have excellent corrosion resistance,low melting point,and thereby showing recycling availability when compared to other *** experiments were conducted to select the most suitable material for marine *** electrochemical experiments were conducted in natural *** corrosion test was performed in many methods such as anodic/cathodic polarization and Tafel analysis using multi-channel potentio/galvanostat WMPG *** results,anodic and cathodic polarization behaviors indicate the characteristics of passive state and concentration polarization by reduction reaction in dissolved oxygen,which shows excellent electrochemical *** analysis results show no significant difference but 5052-O alloy of various alloy materials indicates the lowest corrosion current ***,5052-O Al alloy presents most anti-corrosion material in marine environment.

关键词： Al alloy ship electrochemical characteristics corrosion

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Multi-Bandgap Monolithic Metal Nanowire Percolation Network Sensor Integration by Reversible Selective Laser-Induced Redox

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Nano-Micro Letters 2022年第3期14卷 216-228页

作者： Junhyuk Bang Yeongju Jung Hyungjun kim Dongkwan kim Maenghyo Cho Seung hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National University1 Gwanak‑roGwanak‑guSeoul 151‑742Republic of Korea Department of Mechanical Engineering Seoul National University1 Gwanak‑roGwanak‑guSeoul 08826Republic of Korea Institute of Advanced Machines and Design Institute of Engineering ResearchSeoul National UniversitySeoul 08826Republic of Korea

Active electronics are usually composed of semiconductor and metal electrodes which are connected by multiple vacuum deposition steps and photolithography ***,the presence of interface of dissimilar material between semiconductor and metal electrode makes various problems in electrical contacts and mechanical *** ideal electronics should not have defective interfaces of dissimilar *** this study,we developed a novel method to fabricate active electronic components in a monolithic seamless fashion where both metal and semiconductor can be prepared from the same monolith material without creating a semiconductor-metal interface by reversible selective laser-induced redox(rSLIR)***,rSLIR can control the oxidation state of transition metal(Cu)to yield semiconductors with two different bandgap states(Cu_(2)O and CuO with bandgaps of 2.1 and 1.2 eV,respectively),which may allow multifunctional sensors with multiple bandgaps from the same *** novel method enables the seamless integration of single-phase Cu,Cu_(2)O,and CuO,simultaneously while allowing reversible,selec-tive conversion between oxidation states by simply shining laser ***,we fabricated a flexible monolithic metal-semiconduc-tor-metal multispectral photodetector that can detect multiple *** unique monolithic characteristics of rSLIR process can provide next-generation electronics fabrication method overcoming the limitation of conventional photolithography methods.

关键词： Monolithic integration Seamless interface Multi-bandgap nanowire Laser-induced redox Multispectral photodetector

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Functional Materials and Innovative Strategies for Wearable Thermal Management Applications

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Nano-Micro Letters 2023年第9期15卷 562-603页

作者： Yeongju Jung Minwoo kim Taegyeom kim Jiyong Ahn Jinwoo Lee Seung hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Department of Mechanical Roboticsand Energy EngineeringDongguk University30 Pildong-ro 1-gilJung-guSeoul 04620South Korea Institute of Advanced Machinery and Design(SNU-IAMD) Seoul National UniversityGwanak-roGwanak-guSeoul 08826South Korea Institute of Engineering Research Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea

Thermal management is essential in our body as it affects various bodily functions,ranging from thermal discomfort to serious organ failures,as an example of the worst-case *** have been extensive studies about wearable materials and devices that augment thermoregulatory functionalities in our body,employing diverse materials and systematic approaches to attaining thermal *** paper reviews the recent progress of functional materials and devices that contribute to thermoregulatory wearables,particularly emphasizing the strategic methodology to regulate body *** exist several methods to promote personal thermal management in a wearable *** instance,we can impede heat transfer using a thermally insulating material with extremely low thermal conductivity or directly cool and heat the skin ***,we classify many studies into two branches,passive and active thermal management modes,which are further subdivided into specific *** from discussing the strategies and their mechanisms,we also identify the weaknesses of each strategy and scrutinize its potential direction that studies should follow to make substantial contributions to future thermal regulatory wearable industries.

关键词： Thermal management Passive heat transfer Active heat transfer Wearable materials Wearable device

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Effect of soil pH on the sorption capacity of soil organic matter for polycyclic aromatic hydrocarbons in unsaturated soils

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Pedosphere 2023年第2期33卷 365-371页

作者： Pil-Gon kim Abhrajyoti TARAFDAR Jung-hwan KWON Division of Environmental Science and Ecological Engineering Korea University145 Anam-roSeongbuk-guSeoul 02841(Korea)

Sorption by soil organic matter(SOM)is considered the most important process affecting the bioavailability of hydrophobic organic chemicals(HOCs)in *** sorption capacity of SOM for HOCs is affected by many environmental *** this study,we investigated the effects of soil pH and water saturation level on HOC sorption capacity of SOM using batch sorption *** of soil organic carbon-water partition coefficient(K_(OC))of six selected polycyclic aromatic hydrocarbons(PAHs)were measured in an artificial soil under various soil pH and water saturation *** sampling was used to measure K_(OC)with polydimethylsiloxane as the sampling *** of soil pH,K_(OC)increased with increasing soil water saturation level for lower-molecular-weight *** contrast,K_(OC)decreased with increasing soil water saturation level for higher-molecular-weight *** some fluctuations,K_(OC)tended to decrease with increasing soil pH at all water saturation *** indicates that earlier studies on the effects of soil pH on K_(OC)under saturated conditions could be extended to unsaturated *** K_(OC)tendencies were reproduced in three different natural soils,suggesting that the effects of soil water saturation level and pH might be generalized,at least for *** PAH sorption capacity of SOM was found to be resilient under dynamic soil pH conditions,which can be used to adjust the effects of soil pH.

关键词： contaminated soil hydrophobic organic chemical partition coefficient passive sampling pollutant soil water saturation level

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RADIALLY SYMMETRIC SOLUTIONS FOR QUASILINEAR ELLIPTIC EQUATIONS INVOLVING NONHOMOGENEOUS OPERATORS IN AN ORLICZ-SOBOLEV SPACE SETTING

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Acta Mathematica Scientia 2020年第6期40卷 1679-1699页

作者： Jae-Myoung kim yun-Ho kim Jongrak LEE Department of Mathematics Education Andong National UniversityAndong 36729Republic of Korea Department of Mathematics Education Sangmyung UniversitySeoul 03016Republic of Korea Department of Mathematics Jeju National UniversityJeju 63243Republic of Korea

We investigate the following elliptic equations:⎧⎩⎨−M(∫R Nϕ(|∇u|2)dx)div(ϕ′(|∇u|2)∇u)+|u|α−2 u=λh(x,u),u(x)→0,as|x|→∞,in R N,where N≥2,1 详细信息

We investigate the following elliptic equations:⎧⎩⎨−M(∫R Nϕ(|∇u|2)dx)div(ϕ′(|∇u|2)∇u)+|u|α−2 u=λh(x,u),u(x)→0,as|x|→∞,in R N,where N≥2,1

关键词： radial solution quasilinear elliptic equations variational methods Orlicz-Sobolev spaces

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URANS simulations for a free-running container ship:Part 2. Added power

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Journal of Hydrodynamics 2021年第3期33卷 448-467页

作者： Dong-hwan kim Yugo Sanada Hamid Sadat-Hosseini Frederick Stern IIHR-Hydroscience and Engineering The University of IowaIowa CityUSA Costal Development and Ocean Energy Research Center Korea Institute of Ocean Science and TechnologyBusanKorea Mechanical Engineering University of North TexasDentonUSA

Part 2 reports the validation,local force and local flow study results for the free-running added power simulations whose conditions are the same as the self-propulsion test except for the increased propeller rotational speed and the presence of *** targeting the same mean Froude number in the wave condition,the propeller requires the increased propeller rotational speed for the operation at the low advance ratio due to the added *** test is performed at five different wavelengths in head waves and four different headings in the oblique *** the validation study,the time series of the validation variables is decomposed with discrete Fourier transform to extract the harmonic *** variables are global parameters,including motions,propeller thrust,and torque coefficients,added power variables,and self-propulsion factors which show reasonable agreement against the experiment results and produces a similar error from the self-propulsion *** local force study shows that the added resistance mostly appears at the bow due to the bow plunging during the short head wave and resonance *** contributions of the gravitational force and the buoyant force are found to increase as the stern motion exceeds the bow motion during the long head wave *** oscillation of the propeller performances shows correlation with the first harmonic amplitude of the propeller ***,pitch,and roll decay tests are performed prior to the main test to assess the natural frequencies of the *** as Part 1,a discretized propeller is used.

关键词： Added power unsteady Reynolds-averaged Navier-Stokes(URANS) KRISO Container Ship(KCS) CFDShip-IOWA

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Essentials of thoracic outlet syndrome:A narrative review

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World Journal of Clinical Cases 2021年第21期9卷 5804-5811页

作者： Min Cheol Chang Du hwan kim Department of Rehabilitation Medicine College of MedicineYeungnam UniversityDaegu 42415South Korea Department of Physical Medicine and Rehabilitation College of MedicineChung-Ang UniversitySeoul 06973South Korea

Thoracic outlet syndrome(TOS)is a group of diverse disorders involving compression of the nerves and/or blood vessels in the thoracic outlet *** results in pain,numbness,paresthesia,and motor weakness in the affected upper *** reviewed the pathophysiology,clinical evaluation,differential diagnoses,and treatment of *** is usually classified into three types,neurogenic,venous,and arterial,according to the primarily affected *** true neurogenic and disputed TOS are considered neurogenic *** identifying the causative lesions is complex,detailed history taking and thorough clinical investigation are *** and imaging studies are helpful for excluding other possible disorders and confirming the diagnosis of true neurogenic *** existence of a disputed TOS remains *** physicians tend to be skeptical about the existence of disputed TOS,but thoracic surgeons argue that disputed TOS is *** who encounter patients with TOS need to understand its key features to avoid misdiagnosis and provide appropriate treatment.

关键词： Brachial plexus Diagnosis Review Thoracic outlet syndrome Treatment Neuromuscular lesions

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Unified deep learning model for El Niño/Southern Oscillation forecasts by incorporating seasonality in climate data

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Science Bulletin 2021年第13期66卷 1358-1366,M0004页

作者： Yoo-Geun Ham Jeong-hwan kim Eun-Sol kim Kyung-yun On Department of Oceanography Chonnam National UniversityGwangju 61186South Korea Kakao Brain Bundang-guSeongnam-siGyeonggi-do 13494South Korea

Although deep learning has achieved a milestone in forecasting the El Niño-Southern Oscillation(ENSO),the current models are insufficient to simulate diverse characteristics of the ENSO,which depends on the calendar ***,a model was generated for specific seasons which indicates these models did not consider physical constraints between different target seasons and forecast lead times,thereby leading to arbitrary fluctuations in the predicted time *** overcome this problem and account for ENSO seasonality,we developed an all-season convolutional neural network(A_CNN)*** correlation skill of the ENSO index was particularly improved for forecasts of the boreal spring,which is the most challenging season to ***,activation map values indicated a clear time evolution with increasing forecast lead *** study findings reveal the comprehensive role of various climate precursors of ENSO events that act differently over time,thus indicating the potential of the A_CNN model as a diagnostic tool.

关键词： Deep learning ENSO forecasts Seasonality of the ENSO

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