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Effectiveness of contrast-enhanced harmonic endoscopic ultrasound for the evaluation of solid pancreatic masses

World Journal of Gastroenterology 2014年第2期20卷 518-524页

作者： Jin-seok park Hyung Kil Kim Byoung Wook Bang Sang Gu Kim seok Jeong Don Haeng Lee Digestive Disease Center Department of Internal MedicineInha University School of MedicineIncheon 400-711South Korea

AIM:To evaluate the usefulness of contrast-enhanced harmonic endoscopic ultrasound(ch-EUS)in differentiating between pancreatic adenocarcinomas and other pancreatic ***:This retrospective cohort study evaluated90 patients who were seen between november 2010and May *** these patients had solid pancreatic masses that had a hypoechoic appearance on *** patients underwent ch-EUS to evaluate this diagnostic method’s *** mass lesions observed on ch-EUS were classified into three categories based on their echo intensity:hypoenhanced,isoenhanced,and hyperenhanced *** adjusted the sensitivity and the specificity of each category for detecting *** also estimated the accuracy of ch-EUS by comparing it to a pathological ***:Of the 90 patients,62 had a pancreatic ***-seven out of 62 pancreatic adenocarcinomas showed a hypoenhanced pattern on *** sensitivity was 92%,the specificity 68%and the accuracy approximately 82%.The area under the curve of the receiver operating characteristic analysis for ch-EUS was *** is a significant association between the hypoenhanced pattern on ch-EUS and pancreatic duct adenocarcinoma(χ2=35.264,Pn pathological examinations,the number of specimens for EUS-fine needle aspiration(EUS-FnA)was considered insufficient for diagnosis in three patients,and in two patients,the results were reported to be negative for *** masses in all five patients revealed a hypoenhanced pattern with *** patients were diagnosed with pancreatic adenocarcinoma based on the pathology results of a biopsy,and the remaining two patients were clinically diagnosed with ***:ch-EUS is useful for distinguishing between pancreatic adenocarcinoma and other pancreatic *** a pancreatic mass shows a hypoenhanced pattern on ch-EUS but involves either insufficient samples or negative results with EUS-FnA,clinicians might consider perfo

关键词： Pancreas neoplasm Endoscopic ultrasound SonoVue Contrast media Microbubbles

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Passivating contact-based tunnel junction Si solar cells using mach.ne learning for tandem cell applications

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Energy and AI 2023年第4期14卷 550-558页

作者： HyunJung park Audrey Morisset Munho Kim Hae-seok Lee Aicha Hessler-Wyser Franz-Josef Haug christophe Ballif Photovoltaics and Thin Film Electronics Laboratory(PV-Lab) EPFLSchool of Engineering(STI)Maladière 71bNeuchâtelCH-2000Switzerland School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang Avenue639798SingaporeSingapore Graduate School of Energy and Environment(KU-KIST Green School) Korea University145Anam-roSeongbuk-gu02841SeoulRepublic of Korea

Tandem solar cells are a key technology for exceeding the theoretical efficiency limit of single-junction *** of the most promising combinations is the silicon–perovskite tandem cells,considering their potential for high efficiency,fabrication on a large scale,and low *** most research focuses on improving each subcell,another key challenge lies in the tunnel junction that connects these subcells,significantly impacting the overall cell ***,we demonstrate the first use of tunnel junctions using a stack of p+/n+polysilicon passivating contacts deposited directly on the tunnel oxide to overcome the drawbacks of conventional metal oxide-based tunnel junctions,including low tunneling efficiency and sputter *** Random Forest analysis,we achieved high implied open circuit voltages over 700 mV and low contact resistivities of 500 mΩcm 2,suggesting fill factor losses of less than 1%abs for the operating conditions of a tandem cell.

关键词： Tunnel junction Tandem Passivating contact Solar cell Mach.ne learning

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Optimal band structure for thermoelectrics with realistic scattering and bands

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npj Computational Materials 2021年第1期7卷 388-396页

作者： Junsoo park Yi Xia Vidvuds Ozoliņš Anubhav Jain Energy Technologies Area Lawrence Berkeley National LaboratoryBerkeleyCAUSA Department of Materials Science and Engineering Northwestern UniversityEvanstonILUSA Department of Applied Physics Yale UniversityNew HavenCTUSA Energy Sciences Institute Yale UniversityWest HavenCTUSA

Understanding how to optimize electronic band structures for thermoelectrics is a topic of long-standing interest in the *** models have been limited to simplified bands and/or scattering *** this study,we apply more rigorous scattering treatments to more realistic model band structures—upward-parabolic bands that inflect to an inverted-parabolic behavior—including cases of multiple *** contrast to common descriptors(e.g.,quality factor and complexity factor),the degree to which multiple pockets improve thermoelectric performance is bounded by interband scattering and the relative shapes of the *** establish that extremely anisotropic“flat-and-dispersive”bands,although best-performing in theory,may not represent a promising design strategy in ***,we determine optimum bandwidth,dependent on temperature and lattice thermal conductivity,from perfect transport cutoffs that can in theory significantly boost zT beyond the values attainable through intrinsic band structures *** analysis should be widely useful as the thermoelectric research community eyes zT>3.

关键词： bands parabolic apply

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Hom-derivations in C^*-ternary Algebras

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Acta Mathematica Sinica,English Series 2020年第9期36卷 1025-1038页

作者： Yuan Feng JIn choonkil park Michael ThRASSIAS Department of Mathematics Yanbian UniversityYanji 133001P.R.China Research Institute for natural Sciences Hanyang UniversitySeoul 04763Republic of Korea Institute of Mathematics University of ZurichCH-8057ZurichSwitzerland

In this paper,we introduce and solve the following additive(ρ1,ρ2)-functional inequalities‖f(x+y+z)-f(x)-f(y)-f(z)‖≤‖ρ1(f(x+z)-f(x)-f(z))‖+‖ρ2(f(y+z)-f(y)-f(z))‖,whereρ1 andρ2 are fixed nonzero complex numbers with|ρ1|+|ρ2|nt method and the direct method,we prove the Hyers–Ulam stability of the above additive(ρ1,ρ2)-functional inequality in complex Banach ***,we prove the Hyers–Ulam stability of hom-derivations in C^*-ternary algebras.

关键词： Hyers–Ulam stability additive (ρ1 ρ2)-functional inequality fixed point method direct method hom-derivation on C^*-ternary algebra

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Effect of barley straw biochar application on greenhouse gas emissions from upland soil for ch.nese cabbage cultivation in short-term laboratory experiments

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Journal of Mountain Science 2016年第4期13卷 693-702页

作者： Se-Won KAnG Dong-cheol SEO Yong-Hwa chEOnG Ju-Wang park Jong-Hwan park Hang-Won KAnG Ki-Do park Yong Sik OK Ju-Sik chO Department of Medicinal & Industrial Crops Korea National College of Agriculture and Fisheries Division of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Sciences Gyeongsang National University Department of Bio-environmental Sciences Sunchon National University national Institute of Crop Science Rural Development Association Korea Biochar Research Center & Department of Biological Environment Kangwon National University

ch.nese cabbage was cultivated in upland soil with the addition of biochar in order to investigate the potential for reduction of greenhouse gas emissions. Barley straw biochar(BSB) was introduced in a Wagner pot(1/5000a) in amounts of 0(BSB0, control), 100(BSB100), 300(BSB300), and 500(BSB500) kg 10a^(-1). After the addition of BSB into the upland soil, carbon dioxide(CO_2) emission increased while methane(ch_4) and nitrous oxide(n_2O) emissions decreased. The highest CO2 flux was measured for the BSB500 sample,(84.6 g m^(-2)) followed by BSB300, BSB100, and BSB0 in decreasing order. Relative to those of control, the total ch_4 flux and n_2O flux for the BSB500 treatment were lower by 31.6% and 26.1%, respectively. The global warming potential(GWP) of the treatment without biochar was 281.4 g CO_2 m-2 and those for treatments with biochar were in the range from 194.1 to 224.9 g CO_2 m^(-2). Therefore, introducing BSB into upland soil to cultivate ch.nese cabbages can reduce the global warming potential.

关键词： Biochar Carbon dioxide Methane nitrous oxide Global warming

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Rumen methanogens and mitigation of methane emission by anti-methanogenic compounds and substances

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Journal of Animal Science and Biotechnology 2017年第2期8卷 271-288页

作者： Amlan Patra Tansol park Minseok Kim Zhongtang Yu Department of Animal Sciences The Ohio State University2029 Fyffe RoadColumbusOH 43210USA Department of Animal nutrition West Bengal University of Animal and Fishery Sciences37 K.B.SaraniBelgachiaKolkata 700037India Animal nutrition and Physiology Team National Institute ofAnimal ScienceRural Development AdministrationWanju 55365Republicof Korea

Methanogenic archaea reside primarily in the rumen and the lower segments of the intestines of ruminants, where they utilize the reducing equivalents derived from rumen fermentation to reduce carbon dioxide, formic acid, or methylamines to methane（ch_4）. Research on methanogens in the rumen has attracted great interest in the last decade because ch_4 emission from ruminants contributes to global greenhouse gas emission and represents a loss of feed energy. Some DnA-based phylogenetic studies have depicted a diverse and dynamic community of methanogens in the rumen. In the past decade, researchers have focused on elucidating the underpinning that determines and affects the diversity, composition, structure, and dynamics of methanogen community of the rumen. Concurrently, many researchers have attempted to develop and evaluate interventions to mitigate enteric ch_4 emission. Although much work has been done using plant secondary metabolites, other approaches such as using nitrate and 3-nitrooxy propanol have also yielded promising results. Most of these antimethanogenic compounds or substances often show inconsistent results among studies and also lead to adverse effects on feed intake and digestion and other aspects of rumen fermentation when fed at doses high enough to achieve effective mitigation. This review provides a brief overview of the rumen methanogens and then an appraisal of most of the antimethanogenic compounds and substances that have been evaluated both in vitro and in vivo. Knowledge gaps and future research.needs are also discussed with a focus on methanogens and methane mitigation.

关键词： Anti-methanogenic compound Methanogen Mitigation Protozoa Rumen

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Comparative analysis of greenhouse gas emission inventory for Pakistan: Part Ⅱ agriculture, forestry and other land use and waste

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Advances in Climate ch.nge Research 2021年第1期12卷 132-144页

作者： Kaleem Anwar MIR ch.nkyoo park Pallav PUROHIT Seungdo KIM Research Centre for Climate ch.nge and Energy Department of Environmental Sciences and BiotechnologyHallym UniversityChuncheon24252Republic of Korea Ministry of Environment Government Complex-SejongSejong-si30103Republic of Korea International Institute for Applied Systems Analysis LaxenburgA-2361Austria Global ch.nge Impact Studies Centre Ministry of Climate ChangeGovernment of PakistanIslamabad44000Pakistan

Understanding Pakistan's greenhouse gas(GHG)emission status is critical for identifying the national targets for GHG mitigation with respect to the nationally determined contributions(nDCs).This study focuses on the development of Pakistan's GHG(C0_(2),ch_(4),and n20)inventories for agriculture,forestry and other land use(AFOLU)and waste sectors using 2006 IPCC *** study should be seen as a direct continuation of the preceding one(Part I[Available online at:https://***/10.1016/***.2020.05.002])which discusses energy and industrial processes and product use in compliance with the 2006 and 1996 IPCC *** also provides sector-specific comparative time series(1994-2017)analysis of GHG inventories,identification of key categories,and national GHG emissions trend for *** results indicate an average relative difference(on average for time series 1994-2017)of 19%and 6%in total GHG emissions(C0_(2)-eq)from AFOLU and waste sector respectively between 2006 and 1996 IPCC *** absolute difference over the entire time series for AFOLU and waste sector was in the range of 3-67 Mt C0_(2)-eq and 1-7 Mt CQ2-eq *** further reveal that the quantity of national GHG emissions by 2006 IPCC Guidelines is 10%lower on average for complete time series compared to 1996 IPCC *** average relative difference for total national emissions of C0_(2),ch_(4) and n20 is-1%,9%,and 48%*** category analysis based on 2006 IPCC Guidelines estimates identified three categories,each contributing>10%to the level assessment in the latest year 2017 and accounting for approximately half of the national GHG *** order to further improve the reliability of GHG inventories,Pakistan needs to move from 1996 to 2006 IPCC Guidelines under a higher Tier approach particularly for identified key categories.

关键词： Greenhouse gas Emission inventory Agriculture Forestry and other land use Waste sector Time series analysis Key categories Pakistan

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用直接涂片检查快速诊断弯曲菌性肠炎

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微生物学免疫学进展 1985年第1期 65-67页

作者： park ch 周正良

空肠弯曲菌是急性胃肠炎常见的病原体。最近已证实,空肠弯曲菌引起的感染多见于夏季,其发生率甚至多于常见的诸如沙门氏菌属和志贺氏菌属的肠道致病菌。常规诊断方法需要2～4天才能出结果。粪便标本立即接种选择培养基(如弯曲菌血平板... 详细信息

空肠弯曲菌是急性胃肠炎常见的病原体。最近已证实,空肠弯曲菌引起的感染多见于夏季,其发生率甚至多于常见的诸如沙门氏菌属和志贺氏菌属的肠道致病菌。常规诊断方法需要2～4天才能出结果。粪便标本立即接种选择培养基(如弯曲菌血平板——Campy-BAP)上或接种含抗生素的巯基醋酸盐培养基中,中加有CO的37℃温箱中培育24～48小时,挑取可疑菌落作鉴别试验后才能确诊。过去,粪便标本涂片企图用革兰氏染色法给弯曲菌性肠炎作快速诊断,但敏感性较低。

关键词：碱性复红快速诊断涂片检查弯曲菌性肠炎粪便标本空肠弯曲菌

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Comparative analysis of greenhouse gas emission inventory for Pakistan:Part I energy and industrial processes and product use

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Advances in Climate ch.nge Research 2020年第1期11卷 40-51页

In order to further improve the accuracy and reliability and reduce uncertainties in the national GHG inventories for Pakistan,this study call for using 2006 IPCC Guidelines,to help to identify the national targets for GHG mitigation with respect to the nationally determined contributions(nDCs).GHG(CO2,ch4,and n20)inventories for Pakistan have been developed by conducting a detailed sectoral assessment of IPCC source sectors,energy,industrial processes and product use(IPPU),agriculture,forestry and other land use(AFOLU),and the waste ***,sector wise comparative analysis of GHG inventories(1994-2017)based on the 2006 and 1996 IPCC Guidelines have also been *** indicated an average relative difference of 4%in total GHG emissions(CO2 equivalent)from energy sector between 2006 and 1996 IPCC *** 3.6%average annual growth rate based on 2006 IPCC Guidelines,CO2 from energy sector remained the most abundant GHG emitted,followed by ch4 and *** the average absolute difference in emissions of ch4 and n20 from the energy sector is notable,the total estimated GHG emissions by 2006 IPCC Guidelines duplicate those by 1996 IPCC *** the mineral industry with 2006 IPCC Guidelines,an average annual growth rate of 6.7%is observed,contributing 64%of total IPPU sector CO2 ***,the relative difference between the two Guidelines in overall IPPU sector emissions remained *** might be a need for switch.ng to 2006 IPCC Guidelines to consider more parameters such as additional source sectors and new default emission factors that fit into national circumstances.

关键词： Greenhouse gas Emission inventory Energy sector Industrial processes and product use Pakistan

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Scale-invariant mach.ne-learning model accelerates the discovery of quaternary chalcogenides with ultralow lattice thermal conductivity

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npj Computational Materials 2022年第1期8卷 455-466页

作者： Koushik Pal cheol Woo park Yi Xia Jiahong Shen chris Wolverton Department of Materials Science and Engineering Northwestern UniversityEvanstonIL60208USA

We design an advanced mach.ne-learning(ML)model based on crystal graph convolutional neural network that is insensitive to volumes(i.e.,scale)of the input crystal structures to discover novel quaternary chalcogenides,AMM′Q3(A/M/M'=alkali,alkaline earth,post-transition metals,lanthanides,and Q=chalcogens).These compounds are shown to possess ultralow lattice thermal conductivity(κ_(l)),a desired requirement for thermal-barrier coatings and *** screening the thermodynamic stability of~1 million compounds using the ML model iteratively and performing density-functional theory(DFT)calculations for a small fraction of compounds,we discover 99 compounds that are validated to be stable in *** several DFT-stable compounds,we calculate theirκl using Peierls–Boltzmann transport equation,which reveals ultralowκ_(l)(nd strong phonon *** work demonstrates the high efficiency of scale-invariant ML model in predicting novel compounds and presents experimental-research opportunities with these new compounds.

关键词： ultralow thermal invariant

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