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Experimental and Computational Studies on Coanda Nozzle Flow for the Air Knife Application

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Journal of Thermal Science 2007年第2期16卷 164-169页

作者： soon-bum kwon Dong-Won LEE Young-Doo kwon School of Mechanical Engineering Kyungpook National University1370Sankyuk-dongDaegu 702-701Korea

在连续热剧降的电镀的过程控制锌的电影厚度，它从早天被知道通过一把空气刀的煤气的擦去是最有效的。擦在电镀使用过程的气体引起为涂层的某个高速度从长带边打起浪花的一个问题。在现在的学习，喷气结构和在板表面侵犯压力的分发上的 ... 详细信息

在连续热剧降的电镀的过程控制锌的电影厚度，它从早天被知道通过一把空气刀的煤气的擦去是最有效的。擦在电镀使用过程的气体引起为涂层的某个高速度从长带边打起浪花的一个问题。在现在的学习，喷气结构和在板表面侵犯压力的分发上的 Coanda 嘴的偏转角度的效果因此数字地并且试验性地被调查。在数字分析，管理方程由三维的时间组成了依赖完整的海军司烧方程，标准 k- 吗？等等解决狂暴的应力的骚乱模型被雇用。在实验， 16 隧道压力扫描阀门和 3 轴汽车穿越单位被用来在长带表面测量侵犯的压力。作为结果，它被发现那为空气刀的一样的嘴裂缝的偏转角度越小，侵犯的压力是越多 larger。减少分离水泡的尺寸并且提高切的能力，与 Coanda 嘴使用一把空气刀是明智的。

关键词：附壁效应喷嘴流动气刀应用

Influence of Indian mustard (Brassica juncea) on rhizosphere soil solution chemistry in long-term contaminated soils:A rhizobox study

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Journal of Environmental Sciences 2010年第1期22卷 98-105页

作者： kwon-Rae Kim Gary Owens soon-lK kwon Climate Change & Agroecology Division Department of Agricultural EnvironmentNational Academy of Agricultural ScienceRDARepublic of Korea Centre for Environmental Risk Assessment and Remediation University of South Australia

This study investigated the influence of Indian mustard （Brassicajuncea） root exudation on soil solution properties （pH, dissolved organic carbon （DOC）, metal solubility） in the rhizosphere using a rhizobox. Measurement was conducted following the cultivation of Indian mustard in the rhizobox filled four different types of heavy metal contaminated soils （two alkaline soils and two acidic soils）. The growth of Indian mustard resulted in a significant increase （by 0.6 pH units） in rhizosphere soil solution pH of acidic soils and only a slight increase （〈 0.1 pH units） in alkaline soils. Furthermore, the DOC concentration increased by 17-156 mg/L in the rhizosphere regardless of soil type and the extent of contamination, demonstrating the exudation of DOC from root. Ion chromatographic determination showed a marked increase in the total dissolved organic acids （OAs） in rhizosphere. While root exudates were observed in all soils, the amount of DOC and OAs in soil solution varied considerably amongst different soils, resulting in significant changes to soil solution metals in the rhizosphere. For example, the soil solution Cd, Cu, Pb, and Zn concentrations increased in the rhizosphere of alkaline soils compared to bulk soil following plant cultivation. In contrast, the soluble concentrations of Cd, Pb, and Zn in acidic soils decreased in rhizosphere soil when compared to bulk soils. Besides the influence of pH and DOC on metal solubility, the increase of heavy metal concentration having high stability constant such as Cu and Pb resulted in a release of Cd and Zn from solid phase to liquid phase.

关键词： dissolved organic carbon heavy metals root exudates solubility rhizosphere chemistry

Predictors and prognostic impact of post-operative atrial fibrillation in patients with hip fracture surgery

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World Journal of Clinical Cases 2022年第11期10卷 3379-3388页

作者： Seong Jun Bae Chang Hee kwon Tae-Young Kim Haseong Chang bum Sung Kim Sung Hea Kim Hyun-Joong Kim Department of Internal Medicine Konkuk University Medical CenterSeoul 05030South Korea Department of Orthopaedic Surgery Konkuk University Medical CenterSeoul 05030South Korea

BACKGROUND Atrial fibrillation(AF)is the most common arrhythmia developing in postoperative *** data are available regarding pre-operative risk factors and prognostic impact of post-operative AF(POAF)following hip fracture surgery(HFS)in Korean *** We aimed to investigate the incidence,predictors,and hospital prognosis of POAF in HFS *** This study included 245 patients without history of AF who underwent HFS between August 2014 and November *** was defined as new-onset AF that occurred during hospitalization after *** Twenty patients(8.2%)experienced POAF after *** developed on median post-operative day 2(interquartile range,1–3).Multivariable logistic regression analysis showed that age[odds ratio(OR),1.111;95%confidence interval(CI),1.022–1.209],chronic obstructive pulmonary disease(COPD)(OR,6.352;95%CI,1.561–25.841)and E/e’ratio(OR,1.174;95%CI,1.002–1.376)were significant predictors of *** with POAF had a significantly higher intensive care unit admission rate(55.0%vs 14.7%,P<0.001)and incidence of congestive heart failure(45.0%vs 10.7%,P<0.001).In multivariable logistic regression analysis,POAF was significantly associated with increased incidence of congestive heart failure(OR,4.856;95%CI,1.437–16.411)and intensive care unit admission(OR,6.615;95%CI,2.112–20.718).CONCLUSION POAF was frequently developed in elderly patients following ***,COPD and elevated E/e’ratio were found as significant predictors of POAF in HFS *** with POAF significantly experienced intensive care unit admission and incident congestive heart failure during hospitalization.

关键词： Atrial fibrillation Post-operative Predictor Prognosis Hip fracture surgery

Rapid determination of lithium-ion battery degradation: High C-rate LAM and calculated limiting LLI

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Journal of Energy Chemistry 2022年第4期31卷 663-671页

作者： Gyuwon Seo Jaeyun Ha Moonsu Kim Jihyeon Park Jaewon Lee Eunoak Park Sungyool Bong Kiyoung Lee soon Jong kwon Seung-pil Moon Jinsub Choi Jaeyoung Lee Electrochemical Reaction and Technology Laboratory School of Earth Sciences and Environmental EngineeringGwangju Institute of Science and Technology(GIST)Gwangju 61005South Korea Department of Chemistry and Chemical Engineering Inha UniversityIncheon 22212South Korea Ertl Center for Electrochemistry and Catalysis GISTGwangju 61005South Korea Korea Electric Power Corporation Research Institute Daejeon 34056South Korea International Future Research Center of Chemical Energy Storage and Conversion Processes(ifRC-CHESS) GISTGwangju 61005South Korea

Herein,incremental capacity-differential voltage (IC-DV) at a high C-rate (HC) is used as a non-invasive diagnostic tool in lithium-ion batteries,which inevitably exhibit capacity fading caused by multiple mechanisms during charge/discharge *** battery degradation modes are complex,the simple output of capacity fading does not yield any useful data in that *** IC and DV curves obtained under restricted conditions (<0.1C,25℃) were applied in non-invasive analysis for accurate observation of degradation symptoms,a facile,rapid diagnostic approach without intricate,complex calculations is critical in on-board ***,Li Ni_(0.5)Mn_(0.3)Co_(0.2)O_(2)(NMC532)/graphite pouch cells were cycled at 4 and 6C and the degradation characteristics,i.e.,loss of active materials (LAM) and loss of lithium inventory (LLI),were parameterized using the IC-DV *** the incremental current cycling,the initial steep LAM and LLI slopes underwent gradual transitions to gentle states and revealed the gap between low-and high-current measurements.A quantitative comparison of LAM at high and low C-rate showed that a IC;revealed the relative amount of available reaction region limited by cell ***,this did not provide a direct relationship for estimating the LAM at a low ***,the limiting LLI,which is calculated at a C-rate approaching 0,was obtained by extrapolating the LLI through more than two points measured at high C-rate,and therefore,the LLI at 0.1C was accurately determined using rapid cycling.

关键词： Battery degradation Rapid degradation diagnosis Loss of active materials(LAM) Loss of lithium inventory(LLI) Incremental capacity(IC) Differential voltage(DV)

Different oncological features of colorectal cancer codon-specific KRAS mutations:Not codon 13 but codon 12 have prognostic value

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World Journal of Gastroenterology 2023年第32期29卷 4883-4899页

作者： Hong-Min Ahn Duck-Woo Kim Tae Gyun Lee Hye-Rim Shin In Jun Yang Jeehye Lee Jung Wook Suh Heung-kwon Oh Sung-bum Kang Department of Surgery Seoul National University Bundang HospitalSeongnam 13620South Korea Department of Pathology Seoul National University Bundang HospitalSeongnam 13620South Korea Department of Pathology Seoul National University HospitalSeoul 03080South Korea

BACKGROUND Approximately 40%of colorectal cancer(CRC)cases are linked to Kirsten rat sarcoma viral oncogene homolog(KRAS)*** mutations are associated with poor CRC prognosis,especially KRAS codon 12 mutation,which is associated with metastasis and poorer ***,the clinicopathological characteristics and prognosis of KRAS codon 13 mutation in CRC remain *** To evaluate the clinicopathological characteristics and prognostic value of codonspecific KRAS mutations,especially in codon *** This retrospective,single-center,observational cohort study included patients who underwent surgery for stage I-III CRC between January 2009 and December *** with KRAS mutation status confirmed by molecular pathology reports were *** relationships between clinicopathological characteristics and individual codon-specific KRAS mutations were *** data were analyzed to identify codon-specific KRAS mutations as recurrence-related factors using the Cox proportional hazards regression *** Among the 2203 patients,the incidence of KRAS codons 12,13,and 61 mutations was 27.7%,9.1%,and 1.3%,*** KARS codons 12 and 13 mutations showed a tendency to be associated with clinical characteristics,but only codon 12 was associated with pathological features,such as stage of primary tumor(T stage),lymph node involvement(N stage),vascular invasion,perineural invasion,tumor size,and microsatellite *** codon 13 mutation showed no associations(77.2%vs 85.3%,P=0.159),whereas codon 12 was associated with a lower 5-year recurrence-free survival rate(78.9%vs 75.5%,P=0.025).In multivariable analysis,along with T and N stages and vascular and perineural invasion,only codon 12(hazard ratio:1.399;95%confidence interval:1.034-1.894;P=0.030)among KRAS mutations was an independent risk factor for *** This study provides evidence that KRAS codon 13 mutation is less likely to serve as a prognostic biom

关键词： Genes Ras Codon Colonic neoplasms Rectal neoplasms

Study of material removal behavior on R-plane of sapphire during ultra-precision machining based on modified slip-fracture model

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Nanotechnology and Precision Engineering 2020年第3期3卷 141-155页

作者： Suk bum kwon Aditya Nagaraj Hae-Sung Yoon Sangkee Min Department of Mechanical Engineering University of Wisconsin-Madison1513 University AvenueMadisonWI 53706United States of America School of Aerospace and Mechanical Engineering Korea Aerospace University76 Hanggongdaehak-roDeogyang-guGoyang-siGyeonggi-do 10540Republic of Korea

In this paper, the modified slip/fracture activation model has been used in order to understand the mechanism of ductile-brittle transition on the R-plane of sapphire during ultra-precision machining by reflecting direction of resultant force. Anisotropic characteristics of crack morphology and ductility of machining depending on cutting direction were explained in detail with modified fracture cleavage and plastic deformation parameters. Through the analysis, it was concluded that crack morphologies were mainly determined by the interaction of multiple fracture systems activated while, critical depth of cut was determined by the dominant plastic deformation parameter. In addition to this, by using proportionality relationship between magnitude of resultant force and depth of cut in the ductile region, an empirical model for critical depth of cut was developed.

关键词： Ductile-brittle transition Crack morphology Single crystal sapphire Deformation mechanism Orthogonal cutting Ultra-precision machining

Evaluation of particle growth systems for sampling and analysis of atmospheric fine particles

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Particuology 2011年第6期9卷 606-610页

作者： Dae Seong Kim Sang bum Hong Jung-Taek kwon Kihong Park Department of Environmental Science and Engineering Gwangju Institute of Science and Technology Korea Polar Research Institute Laboratory of Toxicology College of Veterinary Medicine Seoul National University

Three types of water-based condensational growth systems, which can enable particles to grow in size to facilitate sampling and subsequent chemical analysis, were evaluated. The first one is a mixing type growth system where aerosols are mixed with saturated water vapor, the second one is a thermal diffusive growth system where warm flow enters cold-walled tube, and the third one is a laminar flow type where cold flow enters a warm wet-wall tube. Hygroscopic sodium chloride （NaCl）, ammonium sulfate （（NH4）2SO4） and ammonium nitrate （NH4N03）, and non-hygroscopic polystyrene latex （PSL） particles, in the size range of 50-400 nm, were used to determine their growth factors through the growth systems. Our data showed that the third-type growth system could enable particles to grow most efficiently regardless of their hygroscopic property. Collection efficiency of particles in the size range of 0.05-2.5 μm, in a continuous aerosol sampler after they passed through the third-type growth system was about 100%, suggesting that the third-type growth system would he the most useful among the tested growth systems for sampling and subsequent chemical analysis of fine and ultrafine particles.

关键词： Particle growth chamber Condensational growth Particle sampler Hygroscopic particles

Speed vernalization to accelerate generation advance in winter cereal crops

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Molecular Plant 2022年第8期15卷 1300-1309页

作者： Jin-Kyung Cha Kathryn O'Connor Samir Alahmad Jong-Hee Lee Eric Dinglasan Hyeonjin Park So-Myeong Lee Dominique Hirsz soon-Wook kwon Youngho kwon Kyeong-Min Kim Jong-Min Ko Lee T.Hickey Dongjin Shin Laura E.Dixon National Institute of Crop Science RDAMiryang 50424Korea School of Biology Faculty of Biological SciencesUniversity of LeedsLeeds LS29JTUK Queensland Alliance for Agriculture and Food Innovation The University of QueenslandSt.LuciaQLDAustralia Department of Plant Bioscience Pusan National UniversityMiryang 60463Korea

There are many challenges facing the development of high-yielding,nutritious crops for future *** limiting factor is generation time,which prolongs research and plant breeding *** advances in speed breeding protocols have dramatically reduced generation time for many short-day and long-day species by optimizing lightand temperature conditions during plant ***,winter crops with a vernalization requirement stillrequire upto 6-10weeks in low-temperature conditions before thetransition to ***,we tested a suite of environmental conditions and protocols to investigate whether the vernalization process can be *** identified a vernalization method consisting of exposing seeds at the soil surface to an extended photoperiod of 22 h day:2 h night at 10°C with transfer to speed breeding conditions that dramatically reduces generation time in both winter wheat(Triticum aestivum)and winter barley(Hordeum vulgare).Implementation of the speedvernalization protocolfollowed byspeedbreedingallowed the completion ofuptofivegenerations per yearforwinter wheat or barley,whereas only two generations can be typically completed under standard vernalization and plant growth *** speed vernalization protocol developed in this study has great potential to accelerate biological research and breeding outcomes for winter crops.

关键词： speed breeding photoperiod temperature wheat barley breeding

Optimal rotor wear design in hypotrochoidal gear pump using genetic algorithm

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Journal of Central South University 2011年第3期18卷 718-725页

作者： kwon soon-man KIM Chang-Hyun SHIN Joong-ho Department of Mechanical Design and Manufacturing Engineering Changwon National University

The wear rate between the rotors of a hypotrochoidal gear pump is *** the knowledge of shape design on the rotors,the contact stresses without hydrodynamic effect between the rotor teeth were evaluated through the calculation of the Hertzian contact *** on the above results and the sliding velocity between the rotors,a genetic algorithm (GA) was used as an optimization technique forminimizing the wear rate proportional factor (WRPF).The result shows that the wear rate or the WRPF can be reduced considerably,*** 12.8%,throughout the optimization using GA.

关键词：遗传算法形状设计磨损率齿轮泵转子 GA优化水动力作用接触应力