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Flux Optimization During Tapping in BOF Process

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Flux Optimization During Tapping in BOF Process

A Study of the Influence of Air-knife Tilting on Coating Thickness in Hot-dip Galvanizing

The 2nd International Symposium on Clean Steel(ISCS 2011)

作者： Hyun-Seo PARK Sung-Mo SEO ji-tae kwon Joo CHOI Steelmaking Research Group POSCO Technical Research Laboratories699Gumho-dongGwangyang-siJeonnam545-090Korea Technology development team plate rolling departmentGwangyang SteelworksPOSCOGumho-dongGwangyang-siJeonnam545-711Korea

An integrated Plate Mill has started it’s operation on July 7,2010 in Gwangyang Steelworks,*** production capability is about 2.5 million tons per year and the main stream consists of Blast Furnace,Hot metal pretreatment （KR）,Converter,Bubbling Station,RH/VTD and Continuous ***,it is possible to control sulfur concentration at excellent level in BOF without any further treatment in LF or VTD,which is attained by unique KR process and scrap usage strategy in *** this paper,desulfurization efficiency and steel cleanliness was introduced by optimizing flux amount during tapping in BOF *** addition,the effect of the flux addition on the refractory of ladle was investigated based on EPMA analyses with the viewpoint of phase *** cleanliness of each sample was examined using optical emission spectrometry and oxygen nitrogen determinator.

关键词： plate mill steel cleanliness flux tapping

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Journal of Thermal Science 2009年第3期18卷 262-267页

作者： tae-Seok CHO Young-Doo kwon Soon-Bum kwon School of Mechanical Engineering Kyungpook National University

Gas wiping is a decisive operation in hot-dip galvanizing process. In special, it has a crucial influence on the thickness and uniformity in coating film, but may be subsequently responsible for the problem of splashing. The progress of industry demands continuously the reduction of production costs which may relate directly with the increase of coating speed, and the speed up of coating results in the increase of stagnation pressure in gas wiping system in final. It is known that the increase of stagnation pressure may accompany a harmful problem of splashing in general. Together with these, also, from the view point of energy consumption, it is necessary to design a nozzle optimally. And there is known that the downward tilting of nozzle using in air knife system is effective to prevent in somewhat the harmful problem of splashing. In these connections, first, we design a nozzle with constant expansion rate. Next, for the case of actual coating conditions in field, the effects of tilting of the constant expansion rate nozzle are investigated by numerical analysis. Under the present numerical conditions, it was turned out that the nozzle of constant expansion rate of p = having a downward jet angle of 5^0 is the most effective to diminish the onset of splashing, while the influence of small tilting of the nozzle on impinging wall pres- sure itself is not so large.

关键词： Air-knife Constant expansion rate nozzle Impinging pressure Wall shear stress Hot-dip galvanizing Coating thickness Splashing

Prognostic implications of FGFR1 and MYC status in esophageal squamous cell carcinoma

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World Journal of Gastroenterology 2016年第44期22卷 9803-9812页

作者： Dohee kwon ji Yun Yun Bhumsuk Keam Young tae Kim Yoon Kyung Jeon Department of Pathology Seoul National University Hospital Seoul National University College of Medicine Department of Internal Medicine Seoul National University Hospital Seoul National University College of Medicine Department of Thoracic Surgery Seoul National University Hospital Cancer Research Institute Genomic Medicine Institute Seoul National University College of Medicine Seoul National University College of Medicine

AIM To investigate the clinicopathological features and prognostic implications of combined MYC and fibroblast growth factor receptor 1(FGFR1) status in esophageal squamous cell carcinomas(ESCCs). METHODS All patients with ESCC(n = 180) underwent surgical resection at Seoul National University Hospital sometime between 2000 and 2013. A tissue microarray was constructed using cores obtained from representative tumor areas of formalin-fixed, paraffin-embedded tissue blocks. FGFR1 and MYC copy numbers were quantified using fluorescence in situ hybridization. The level of MYC expression was determined using immunohistochemistry. FGFR1 and MYC amplification status was compared between primary and metastatic lymph nodes. Univariate and multivariate survival analyses were performed according to adjuvant therapy *** FGFR1 and MYC amplifications were observed in 21.4%(37/173) and 54.2%(91/168) of patients, respectively, while MYC expression was observed in 58.9%(106/180) of patients. There was a positive correlation between MYC amplification and overexpression(P = 0.002). Although FGFR1 amplification was not associated with MYC amplification or expression, 12.3%(20/163) of patients exhibited both FGFR1 amplification and MYC expression. There was also a correlation in FGFR1 amplification status between matched primary tumors and metastatic lymph nodes(P < 0.001). MYC expression was higher in ESCCs with p T1(P < 0.001) and in those with no lymph node metastasis(P = 0.023). MYC expression was associated with prolonged diseasefree survival(P = 0.036) and overall survival(OS)(P = 0.017) but was not an independent prognostic factor. FGFR1 amplification was an independent predictor for prolonged OS in all patients(P = 0.029) and in those who did not receive adjuvant therapy(P = 0.013). Combined FGFR1 amplification and MYC expression predicted better OS in patients who did not receive adjuvant therapy(P = 0.034) but not in those who did receive adjuvant ***

关键词： Receptor tyrosine kinase Fibroblast growth factor receptor 1 MYC Esophageal squamous cell carcinoma Gene amplification Prognosis Fluorescent in situ hybridization

New Spam Filtering Method with Hadoop Tuning-Based MapReduce Naïve Bayes

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Computer Systems Science & Engineering 2023年第4期45卷 201-214页

作者： Keungyeup ji Youngmi kwon Department of Radio and Information Communications Engineering Chungnam National UniversityDaejeon34134Korea

As the importance of email increases,the amount of malicious email is also increasing,so the need for malicious email filtering is *** it is more economical to combine commodity hardware consisting of a medium server or PC with a virtual environment to use as a single server resource and filter malicious email using machine learning techniques,we used a Hadoop MapReduce framework and Naïve Bayes among machine learning methods for malicious email ***ïve Bayes was selected because it is one of the top machine learning methods(Support Vector Machine(SVM),Naïve Bayes,K-Nearest Neighbor(KNN),and Decision Tree)in terms of execution time and *** email was filtered with MapReduce programming using the Naïve Bayes technique,which is a supervised machine learning method,in a Hadoop framework with optimized performance and also with the Python program technique with the Naïve Bayes technique applied in a bare metal server environment with the Hadoop environment not *** to the results of a comparison of the accuracy and predictive error rates of the two methods,the Hadoop MapReduce Naïve Bayes method improved the accuracy of spam and ham email identification 1.11 times and the prediction error rate 14.13 times compared to the non-Hadoop Python Naïve Bayes method.

关键词： Hadoop hadoop distributed file system(HDFS) MapReduce configuration parameter malicious email filtering Naïve Bayes

Graphical interface for motion editing using procedure visualization

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Science China(Information Sciences) 2011年第6期54卷 1227-1237页

作者： kwon ji-Yong LEE In-kwon Department of Computer Science Yonsei University

In this paper, we introduce an interface for motion editing that visualizes editing procedures. For intuitive understanding and construction of motion editing procedures, our system represents an editing element that produces modified motion from a given input motion as a graphical node, and enables user to construct a whole motion editing procedure by connecting the nodes with a few mouse interactions. The system provides both the 3D transform manipulator and the time-line slider for intuitive controlling of the parameters of each node. The user evaluation results show that our system is easy and intuitive to be used by users for editing of motion sequences.

关键词： motion editing procedural visualization graphical development environment animation system character animation

Influence of the preparation method on the catalytic activity of Mg-Al hydrotalcites as solid base catalysts

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Green Energy & Environment 2019年第3期4卷 287-292页

作者： Sungjae Park Dahye kwon ji Yeon Kang ji Chul Jung Department of Chemical Engineering Myongji University

Mg-Al hydrotalcites were synthesized using different preparation methods(a co-precipitation method, a urea method, and a simple one) to analyze their effect on the catalytic activity of these solid base catalysts. The method strongly affected the structure of their layers(e.g., the growth and stacking of the layers, and the type of intercalated anions) and, accordingly, their catalytic activity. The Mg-Al hydrotalcite prepared by co-precipitation showed the best catalytic performance in the isomerization of glucose into fructose, due to the small crystallite size and sand rose morphology enhancing the exposure of surface active sites to reactants.

关键词： Mg-Al hydrotalcite Preparation method Base catalyst Glucose isomerization Fructose

Tuning the base properties of Mg–Al hydrotalcite catalysts using their memory effect

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Journal of Energy Chemistry 2020年第7期29卷 229-236,I0008页

作者： Dahye kwon ji Yeon Kang Suna An Inchan Yang ji Chul Jung Department of Chemical Engineering Myongji UniversityYongin 17058Republic of Korea

Herein,the relationship between the structure and base properties of Mg–Al hydrotalcite catalysts was comprehensively investigated in relation to heat treatment and rehydration processes,which are well known as memory effects of *** structure of Mg–Al hydrotalcites changed from layered double hydroxide(LDH)to mixed metal oxide and subsequently to a spinel structure during heat treatment,and it was returned from mixed metal oxide to a LDH structure by *** on various characterizations,we successfully proposed a detailed mechanism of memory *** also confirmed that the Mg–Al hydrotalcites had weak or strong base sites and that their base properties could be systematically tuned by heat treatment and *** prepared Mg–Al hydrotalcites were applied to a model reaction,isomerization of glucose to fructose,as base *** the catalysts tested,the rehydrated Mg–Al hydrotalcite efficiently produced fructose due to its appropriate base and structure *** finally concluded that the base sites of Mg–Al hydrotalcites can be designed as desired by heat treatment and ***,through systematic design of the base sites of Mg–Al hydrotalcites,these can be promising catalysts for various heterogeneous reactions over base catalysts,giving excellent catalytic performances.

关键词： Mg–Al hydrotalcite Structure Base properties Heat treatment Rehydration

A taxonomic review of the genus Miaenia Pascoe, 1864(Coleoptera: Cerambycidae) from South Korea with a new record of M. tonsa(Bates)

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Journal of Forestry Research 2018年第3期29卷 822-829页

作者： Ik Je Choi tae Sung kwon Jongok Lim Silkworm and Insect Management Center Gyeongsangbuk-do Agricultural Resource Management Institute Forest Insect Pests and Disease Division Korea Forest Research Institute Division of Forest Biodiversity Korea National Arboretum

The cerambycid genus Miaenia Pascoe(Coleoptera: Cerambycoidea) of South Korea is taxonomically reviewed. Two species, Miaenia fasciata fasciata(Matsushita) and Miaenia maritima Tsherepanov have been recorded. In this paper, M. tonsa(Bates) is added to the Korean cerambycid fauna for the first time. A key to Korean Miaenia species, re-description and diagnostic illustrations, including male genitalia for each species, are provided.

关键词： Acanthocinini Cerambycidae Miaenia New species South Korea Taxonomy

Scratch formation and its mechanism in chemical mechanical planarization (CMP)

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Friction 2013年第4期1卷 279-305页

作者： tae-Young kwon Manivannan RAMACHANDRAN jin-Goo PARK Department of Materials Engineering Hanyang UniversityAnsan 426-791Korea

Chemical mechanical planarization(CMP)has become one of the most critical processes in semiconductor device fabrication to achieve global *** achieve an efficient global planarization for device node dimensions of less than 32 nm,a comprehensive understanding of the physical,chemical,and tribo-mechanical/chemical action at the interface between the pad and wafer in the presence of a slurry medium is *** the CMP process,some issues such as film delamination,scratching,dishing,erosion,and corrosion can generate defects which can adversely affect the yield and *** this article,an overview of material removal mechanism of CMP process,investigation of the scratch formation behavior based on polishing process conditions and consumables,scratch formation mechanism and the scratch inspection tools were extensively *** advantages of adopting the filtration unit and the jet spraying of water to reduce the scratch formation have been *** current research trends in the scratch formation,based on modeling perspective were also discussed.

关键词： Chemical mechanical planarization(CMP) defects,scratch post-CMP cleaning defect source