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光子学研究:英文版 2023年第8期11卷 1465-1473页

作者： DAEHWAN AHN SUNGHAN jeon †HOYOUNG SUH SEUNGWAN WOO RAFAEL JUMAR CHU DAEHWAN JUNG WON JUN CHOI DONGHEE PARK JIN-DONG SONG WOO-YOUNG CHOI JAE-HOON HAN Center for Opto-Electronic Materials and Devices Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Electrical and Electronic Engineering Yonsei UniversitySeoul 03722Republic of Korea

Low-intensity light detection necessitates high-responsivity *** achieve this,we report In_(0.53)Ga_(0.47)As∕In As∕In_(0.53)Ga_(0.47)As quantum well(InAs QW)photo-field-effect-transistors(photo-FETs)integrated on a Si substrate using direct wafer *** of the In As QW channel was carefully designed to achieve higher effective mobility and a narrower bandgap compared with a bulk In_(0.53)Ga_(0.47)As,while suppressing the generation of defects due to lattice ***-performance 2.6 nm In As QW photo-FETs were successfully demonstrated with a high on/off ratio of 10~5 and a high effective mobility of 2370 cm^(2)∕(V·s).The outstanding transport characteristics in the InAs QW channel result in an optical responsivity 1.8 times greater than InGaAs photo-FETs and the fast rising/falling ***,we experimentally confirmed that the InAs QW photo-FET can detect light in the short-wavelength infrared(SWIR;1.0–2.5μm)near 2μm thanks to bandgap engineering through In As QW *** result suggests that the InAs QW photo-FET is promising for high-responsivity and extended-range SWIR photodetector applications.

关键词： responsivity quantum wave

An improvement of snow/cloud discrimination from machine learning using geostationary satellite data

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International Journal of Digital Earth 2022年第1期15卷 2355-2375页

作者： Donghyun Jin Kyeong-Sang Lee Sungwon Choi Noh-Hun Seong Daeseong Jung Suyoung Sim Jongho Woo Uujin jeon Yugyeong Byeon Kyung-Soo Han Division of Earth Environmental System Science (Major of Spatial Information System Engineering) Pukyong National UniversityBusanKorea Korea Institute of Ocean Science and Technology Korea Ocean Satellite CenterBusanKorea BK21 FOUR Project of the School of Integrated Science for Sustainable Earth Environmental Disaster Pukyong National UniversityBusanKorea

Snow and cloud discrimination is a main factor contributing to errors in satellite-based snow *** address the error,satellite-based snow cover performs snow reclassification tests on the cloud pixels of the cloud mask,but the error still *** Learning(ML)has recently been applied to remote sensing to calculate satellite-based meteorological data,and its utility has been *** this study,snow and cloud discrimination errors were analyzed for GK-2A/AMI snow cover,and ML models(Random Forest and Deep Neural Network)were applied to accurately distinguish snow and *** ML-based snow reclassified was integrated with the GK-2A/AMI snow cover through *** used the S-NPP/VIIRS snow cover and ASOS in situ snow observation data,which are satellite-based snow cover and ground truth data,as validation data to evaluate whether the snow/cloud discrimination is *** ML-based integrated snow cover detected 33–53%more snow compared to the GK-2A/AMI snow *** terms of performance,the F1-score and overall accuracy of the GK-2A/AMI snow cover was 73.06%and 89.99%,respectively,and those of the integrated snow cover were 76.78–78.28%and 90.93–91.26%,respectively.

关键词： Geostationary satellite GK-2A/AMI snow cover product snow/cloud discrimination machine learning remote sensing

850 nm centered wavelength-swept laser based on a wavelength selection galvo filter

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Chinese Optics Letters 2016年第1期14卷 49-52页

作者： Muhammad Faizan Shirazi Mansik jeon Jeehyun Kim School of Electronics Engineering Kyungpook National University

A wavelength-swept laser is constructed using a free space external cavity configuration coupled with a fiber- based ring cavity at the 850 nm region. The external cavity filter employs a galvo-mirror scanner with a diffraction grating for wavelength selection. The filter is connected to a ring cavity through an optical circulator. The ring cavity contains a broadband semiconductor optical amplifier with a high optical output. The perfor- mance of this laser is demonstrated with broad bandwidths and narrow linewidths. The 3 dB linewidth and the bandwidth of this source are 0.05 nm （-20 GHz） and 48 nm, respectively. The maximum output power is 26 mW at 160 mA current.

关键词： length SOA nm centered wavelength-swept laser based on a wavelength selection galvo filter

Serial blood concentration of polyethoxylated tallow amine and clinical presentations in acute herbicide poisoning

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World Journal of Emergency Medicine 2022年第4期13卷 305-308页

作者： Jungsoo Park Sun Cheun Kim Youngjoon jeon Yong Chul Cho Changshin Kang Yeonho You Hong Joon Ahn Seung Ryu Jihan Lee Wonjoon jeong Department of Emergency Medicine Chungnam National University HospitalDaejeon 35015South Korea Department of Emergency Medicine College of MedicineChungnam National UniversityDaejeon 35015South Korea Forensic Toxicology Division National Forensic ServiceDaejeon 34054South Korea Department of Emergency Medicine Chungbuk National University HospitalCheongju 28644South Korea

Most commercially available herbicides contain surfactants as co-formulants to increase adhesion and absorption by plant *** amines,one of the most used surfactants,are non-ionic and derived from animal *** represent a class of surfactants with similar structural features,including polyethoxylated tallow amine(POEA).POEA is widely used in glyphosate,glufosinate-containing *** 2015,the European Food Safety Society(EFSA)concluded that POEA was more toxic than glyphosate when tested in glyphosate-based formulations.[1]They also attributed the poisoning following ingestion by humans to the presence of POEA.

关键词： attributed formulation ethoxy

Amine axial ligand-coordinated cobalt phthalocyanine-based catalyst for flow-type membraneless hydrogen peroxide fuel cell or enzymatic biofuel cell

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Journal of Energy Chemistry 2021年第7期30卷 463-471页

作者： Heeyeon An Hyewon jeon Jungyeon Ji Yongchai Kwon Yongjin Chung Department of Chemical and Biological Engineering Korea National University of Transportation50 Daehak-roChungjuChungbuk 27469Republic of Korea Graduate School of Energy and Environment Seoul National University of Science and Technology 232 Gongneung-roNowon-guSeoul 01811Republic of Korea Department of Chemical and Biomolecular Engineering Seoul National University of Science and Technology232 Gongneung-roNowon-guSeoul 01811Republic of Korea Department of ITÁEnergy Convergence(BK21 FOUR) Korea National University of Transportation50 Daehak-roChungjuChungbuk 27469Republic of Korea

In this study,an amine-coordinated cobalt phthalocyanine(CoPc)-based anodic catalyst was fabricated by a facile process,to enhance the performance of hydrogen peroxide fuel cells(HPFCs) and enzymatic biofuel cells(EBCs).For this purpose,polyethyleneimine(PEI) was added onto the reduced graphene oxide and CoPc composite(RGO/CoPc) to create abundant NH2 axial ligand groups,for anchoring the Co core within the *** to the PEI addition,the onset potential of the hydrogen peroxide oxidation reaction was shifted by 0.13 V in the negative direction(0.02 V) and the current density was improved by 1.92 times(1.297 mA cm^(-2)),compared to those for RGO/CoPc(0.15 V and 0.676 mA cm^(-2),respectively),due to the formation of donor-acceptor dyads and the prevention of CoPc from leaching *** biocatalyst using glucose oxidase(GOx)([RGO/CoPc]/PEI/GOx) showed a better onset potential and catalytic activity(0.15 V and 318.7 μA cm^(-2)) than comparable structures,as well as significantly improved operational durability and long-term *** is also attributed to PEI,which created a favorable microenvironment for the *** maximum power densities(MPDs) and open-circuit voltages(OCVs) obtained for HPFCs and EBCs using the suggested catalyst were 105.2±1.3 μW cm^(-2)(0.317±0.003 V) and 25.4±0.9 μW cm^(-2)(0.283±0.007 V),*** shows that the amine axial ligand effectively improves the performance of the actual driving HPFCs and EBCs.

关键词： Hydrogen peroxide fuel cell Enzymatic biofuel cell Amine axial ligand Hydrogen peroxide oxidation reaction Membraneless

An Effective Threat Detection Framework for Advanced Persistent Cyberattacks

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Computers, Materials & Continua 2023年第5期75卷 4231-4253页

作者： So-Eun jeon Sun-Jin Lee Eun-Young Lee Yeon-Ji Lee Jung-Hwa Ryu Jung-Hyun Moon Sun-Min Yi Il-Gu Lee Department of Future Convergence Technology Engineering Sungshin Women’s UniversitySeoul02844Korea Department of Convergence Security Engineering Sungshin Women’s UniversitySeoul02844Korea

Recently,with the normalization of non-face-to-face online environments in response to the COVID-19 pandemic,the possibility of cyberattacks through endpoints has *** endpoint devices are managed meticulously to prevent cyberattacks and ensure timely responses to potential security *** particular,because telecommuting,telemedicine,and teleeducation are implemented in uncontrolled environments,attackers typically target vulnerable endpoints to acquire administrator rights or steal authentication information,and reports of endpoint attacks have been increasing *** persistent threats(APTs)using various novel variant malicious codes are a form of a sophisticated ***,conventional commercial antivirus and anti-malware systems that use signature-based attack detectionmethods cannot satisfactorily respond to such *** this paper,we propose a method that expands the detection coverage inAPT attack *** this model,an open-source threat detector and log collector are used synergistically to improve threat detection *** the scope of attack log collection through interworking between highly accessible open-source tools can efficiently increase the detection coverage of tactics and techniques used to deal with APT attacks,as defined by MITRE Adversarial Tactics,Techniques,and Common Knowledge(ATT&CK).We implemented an attack environment using an APT attack scenario emulator called Carbanak and analyzed the detection coverage of Google Rapid Response(GRR),an open-source threat detection tool,and Graylog,an open-source log *** proposed method expanded the detection coverage against MITRE ATT&CK by approximately 11%compared with that conventional methods.

关键词： Advanced persistent threat cybersecurity endpoint security MITRE ATT&CK open-source threat detector threat log collector

Stochastic rules for predator and prey hunting and escape behavior in a lattice-based model

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International Journal of Biomathematics 2016年第6期9卷 181-190页

作者： Wonju jeon Sang-Hee Lee Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Republic of Korea Division of Integrated Mathematics National Institute for Mathematical Sciences Daejeon 34047 Republic of Korea

Understanding of ecosystem resilience and stability requires comprehending predator–prey dynamics because ecosystems consist of dynamically interacting subsystems that include predator–prey relationships. This relationship is closely related to the hunting–escaping strategies employed by the predator and prey. Therefore, understanding the effects of hunting and escaping strategies on ecosystems will lead to a better understanding of these systems. As an approach for describing the predator–prey interaction, lattice-based models have been adopted because this approach has strong advantages for simulating various dynamical processes of individual–individual interaction. In the models, each lattice cell is either considered as an attractive/repulsive cell, or an individual cell, or else it is empty. The attractive (or repulsive cell) can be interpreted as the prey (or predator) of the individual. These states allow us to incorporate the ecological processes of local antagonistic interactions, namely the spread of disturbances (by the predator) and regrowth or recovery (by the prey). These processes are directly related to the strategic behavior of individuals, such as hunting and escaping. In this study, we suggest a simple and effective mapping formula as a stochastic rule to describe the hunting and escaping behavior. This formula could be widely used not only in the behavior but also in competitive and cooperative relationships.

关键词：捕食与被捕食格子模型随机规则行为逃逸被捕食者相互作用生态系统

Lower risk of subarachnoid haemorrhage in diabetes:a nationwide population-based cohort study

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Stroke & Vascular Neurology 2021年第3期6卷 402-409页

作者： Jang Hoon Kim Jimin jeon Jinkwon Kim Department of Neurosurgery Yongin Severance HospitalYonsei University College of MedicineSeoulSouth Korea Department of Neurology Yongin Severance HospitalYonsei University College of MedicineSeoulSouth Korea

Background and purpose Diabetes mellitus(DM)is a common metabolic disorder with increased risk of cardiovascular and cerebrovascular ***,its relationship with risk of subarachnoid haemorrhage(SAH),the most devastating form of stroke,remains *** To evaluate the relationship between DM and risk of SAH,we performed a retrospective cohort study using a nationwide,population‐based,health screening database in *** included participants without history of stroke who underwent a nationwide health screening programme between 2003 and *** outcome was occurrence of *** were followed up until development of SAH or December *** Cox proportional hazards regression analysis was performed with adjustments for age,sex,systolic blood pressure,total cholesterol,body mass index,physical activity,smoking status,alcohol habit,household income and treatment with antihypertensive agents and *** Among 421768 study participants,prevalence of DM was 9.6%.During a mean follow-up period of 11.6±1.9 years,1039 patients developed *** of DM was significantly associated with decreased risk of SAH(adjusted HR 0.68;95%CI 0.53 to 0.86;p<0.001).Elevated level of fasting blood glucose was also negatively associated with risk of SAH(adjusted HR per 1 mmol/L increase 0.90;95%CI 0.86 to 0.95;p<0.001).Conclusion DM and elevated level of fasting blood glucose were inversely associated with risk of *** studies may elucidate the possibly protective,pathophysiological role played by hyperglycaemia in patients at risk of SAH.

关键词： protective nationwide elevated

The role of quercetin on the survival of neuron-like PC12 cells and the expression of α-synuclein

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Neural Regeneration Research 2015年第7期10卷 1113-1119页

作者： Tae-Beom Ahn Beom S.jeon Department of Neurology School of Medicine Kyung Hee University Department of Neurology College of Medicine Seoul National University Department of Neurology Movement Disorder Center Parkinson Study Group and Neuroscience Research Institute Seoul National University Hospital

Both genetic and environmental factors are important in the pathogenesis of Parkinson＇s disease. As α-synuclein is a major constituent of Lewy bodies, a pathologic hallmark of Parkinson＇s disease, genetic aspects of α-synuclein is widely studied. However, the influence of dietary factors such as quercetin on α-synuclein was rarely studied. Herein we aimed to study the neuroprotective role of quercetin against various toxins affecting apoptosis, autophagy and aggresome, and the role of quercetin on α-synuclein expression. PC12 cells were pre-treated with quercetin（100, 500, 1,000 μM） and then together with various drugs such as 1-methyl-4-phenylpyridinium（MPP＋; a free radical generator）, 6-hydroxydopamine（6-OHDA; a free radical generator）, ammonium chloride（an autophagy inhibitor）, and nocodazole（an aggresome inhibitor）. Cell viability was determined using a 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltertazolium bromide（MTT） assay. Apoptosis was detected by annexin V-fluorescein isothiocyanate and propidium iodide through the use of fluorescence activated cell sorter. α-Synuclein expression was detected by western blot assay and immunohistochemistry. The role of α-synuclein was further studied by knocking out α-synuclein using RNA interference. Cell viability increased at lower concentrations（100 and 500 μM） of quercetin but decreased at higher concentration（1,000 μM）. Quercetin exerted neuroprotective effect against MPP＋, ammonium chloride and nocodazole at 100 μM. MPP＋ induced apoptosis was decreased by 100 μM quercetin. Quercetin treatment increased α-synuclein expression. However, knocking out α-synuclein exerted no significant effect on cell survival. In conclusion, quercetin is neuroprotective against toxic agents via affecting various mechanisms such as apoptosis, autophagy and aggresome. Because α-synuclein expression is increased by quercetin, the role of quercetin as an environmental factor in Parkinson＇s disease pathogenesis needs further investigation.

关键词： quercetin Parkinson's disease α-synuclein Lewy body PC12 cells cell viability cell death neuroprotection

Dwindling in the mountains: Description of a critically endangered and microendemic Onychodactylus species(Amphibia, Hynobiidae) from the Korean Peninsula

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Zoological Research 2022年第5期43卷 750-755页

作者： Amael Borzee Yucheol Shin Nikolay APoyarkov Jong Yoon jeon Hae Jun Baek Chang Hoon Lee Junghwa An Yoon Jee Hong Mi-Sook Min Laboratory of Animal Behaviour and Conservation College of Biology and the EnvironmentNanjing Forestry UniversityNanjingJiangsu 210037China Department of Biological Sciences School of Natural ScienceKangwon National UniversityChuncheon 24341Republic of Korea Department of Vertebrate Zoology Biological FacultyM.V.Lomonosov Moscow State UniversityMoscow 119234Russia Research Institute for Veterinary Science College of Veterinary MedicineSeoul National UniversitySeoul 08826Republic of Korea Animal Resources Division National Institute for Biological ResourcesIncheon 22689Republic of Korea

DEAR EDITOR,Species that are not formally described are generally not targets for conservation,regardless of their threatened *** habitat degradation has increased over the past several decades in the Republic of Kore... 详细信息

关键词： habitat endangered mountains