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Use of Machine Learning for modelling the wear of MgO-C refractories in Basic Oxygen Furnace
Sebastian Sado,Wiesław Zelik,Ryszard Lech 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.4
Basic Oxygen Furnace (BOF), TBM type (Thyssen – Blas – Metallurgie) is one of the heat units occurring in a steel productionprocess. The refractory lining of BOF consists of several zones and is lined with MgO-C bricks. For the above mentioned zonesrefractories with different properties are selected due to the different factors influencing the corrosion process. Intense wearof refractories is observed mainly at the slag spout zone in accordance to the influence of thermochemical, thermomechanicalfactors (including the oxidizing atmosphere). The aim of this paper is to find the regression formula with satisfactory forecastmeasure of fit, which will make it possible to predict the refractory material wear in the slag spout zone of BOF dependingon the real wear measurement made during the BOF operation. Calculations were conducted with the use of regression treeswith CART algorithm (Classification and Regression Trees), Multivariate Adaptive Regression Splines (MARS), Boosted Treesalgorithm and Multilayer Neural Networks MLP type (Multilayer Perceptron). Selected metallurgical parameters registeredduring the BOF campaign are the independent variables discussed in refractory material wear models, whereas the wear rateof refractory materials calculated per one heat is set as a dependent variable.
Reima Sado Al-Jarf 한국영어어문교육학회 2005 영어어문교육 Vol.11 No.2
Thirty six EFL freshman students at the College of Languages and Translation, King Saud University, Riyadh, Saudi Arabia were given a dictation, a listening comprehension test and a decoding test. The purpose of the study was to find out whether EFL freshmen students' spelling ability correlates with their listening comprehension and decoding skills. Data analysis showed that the typical EFL freshman student misspelled 41.5% of the words on the dictation, gave 49.5% correct responses on the listening comprehension test, and 52% correct responses on the decoding test. The median and mean scores showed that the subjects' spelling, listening and decoding achievement is low, which implied that the subjects were having spelling, listening comprehension and decoding difficulties. The students' spelling errors and correct listening comprehension and decoding responses revealed strong correlations between spelling ability, listening comprehension and decoding skills. This means that good spelling ability in EFL is related to good listening comprehension and good decoding skills. The better the listening comprehension and decoding abilities, the fewer the spelling errors. When listening comprehension and decoding skills are poor, spelling ability is also poor. Recommendations for spelling, listening and decoding instruction are given.
공정거래위원회의 현장조사의 법적 성질과 한계에 대한 실무적 고찰
신사도 ( Sado Shin ),김영석 ( Youngseok Kim ) 한국경쟁법학회 2021 競爭法硏究 Vol.44 No.-
Although dawn raids have become a primary investigation tool of the Korea Fair Trade Commission (“KFTC”), there still remain uncertainties over their legal nature as well as their workings and limitations when employed in practice. Against this backdrop, this study aims to define the legal nature of the KFTC’s dawn raids and their procedures and limitations from the perspective of a legal professional. First, KFTC’s investigations, including dawn raids are an administrative procedure that should governed by different rules from those for criminal investigation. Second, a voluntary consent by a company under investigation should be a prerequisite for the KFTC’s investigation whichout which an investigation cannot be initiated. Next, a decision of the KFTC to initiate a dawn raid should be a matter contestable through an administrative litigation. Lastly, the KFTC’s dawn raids should strictly comply with an applicable due process. In light of the foregoing, this study proposes that the KFTC’s dawn raids should abide by the following procedures given their legal nature. First, the KFTC should specify the purpose and scope of the investigation in an official inspection notice that is presented to the investigated company at the beginning of a dawn raid. Second, the right to counsel and attorney-client privilege should be protected throughout the investigation to ensure due process of law. Moreover, this study discusses specific ways to inspect materials of the company and o get voluntary consent. To summarize, this study analyzes the legal nature of the KFTC’s investigation and recommends procedural improvements for dawn raids, which are expected to contribute to elaborating legal standards for the KFTC’s investigation and preventing disputes that may arise from a regulatory gap.
Al-Jarf, Reima Sado The English Teachers Association in Korea 2005 영어어문교육 Vol.11 No.2
Thirty six EFL freshman students at the College of Languages and Translation, King Saud University, Riyadh, Saudi Arabia were given a dictation, a listening comprehension test and a decoding test. The purpose of the study was to find out whether EFL freshmen students' spelling ability correlates with their listening comprehension and decoding skills. Data analysis showed that the typical EFL freshman student misspelled 41.5% of the words on the dictation, gave 49.5% correct responses on the listening comprehension test, and 52% correct responses on the decoding test. The median and mean scores showed that the subjects' spelling, listening and decoding achievement is low, which implied that the subjects were having spelling, listening comprehension and decoding difficulties. The students' spelling errors and correct listening comprehension and decoding responses revealed strong correlations between spelling ability, listening comprehension and decoding skills. This means that good spelling ability in EFL is related to good listening comprehension and good decoding skills. The better the listening comprehension and decoding abilities, the fewer the spelling errors. When listening comprehension and decoding skills are poor, spelling ability is also poor. Recommendations for spelling, listening and decoding instruction are given.
Paulo Schiavom Duarte,Luciana Audi de Castroneves,Heitor Naoki Sado,Marcelo Tatit Sapienza,Ana Amélia Fialho de Oliveira Hoff,Carlos Alberto Buchpiguel 대한핵의학회 2018 핵의학 분자영상 Vol.52 No.4
Herein, we report a case of a 19-year-old man with multiple endocrine neoplasia type 2B (MEN2B) and medullary thyroidcarcinoma (MTC) diagnosed when he was 12 years of age. The patient had previously undergone total thyroidectomy, cervicalradiotherapy, and chemotherapy. He progressed with known bone, pulmonary, and lymph node metastases and was scanned with18F-fluoride (18F-NaF) and 68Ga-dotatate whole-body positron emission tomography/computed tomography (PET/CT) for metastaticdisease monitoring.We found that the MTC bone metastases and soft tissue calcified metastases were better characterizedon 18F-NaF PET/CT than on 68Ga-dotatate PET/CT. This case illustrates that the 18F-NaF PET/CT could be helpful not only tothe detection of bone metastases but also to the detection of calcified soft tissue metastases in patients with MTC.
Ueda Cristina Emiko,Duarte Paulo Schiavom,Castroneves Luciana Audi,Coura-Filho George Barbério,Sado Heitor Naoki,Sapienza Marcelo Tatit,Ana Oliveira Hoff,Buchpiguel Carlos Alberto 대한핵의학회 2020 핵의학 분자영상 Vol.54 No.6
Purpose To compare the 18F-NaF PET/CT studies (18F-NaF) with other imaging methods in the detection of skeletal metastases (SM) in patients with medullary thyroid cancer (MTC). Methods We retrospectively analyzed 31 patients with MTC who performed 18F-NaF to assess SM. The results of the 18F-NaF were compared with other imaging methods performed for metastasis detection: 99Tc-MDP bone scan (BS), magnetic resonance imaging (MRI), contrast-enhanced CT (CT), and 68Ga-Dotatate and 18F-FDG PET/CT studies. A qualitative analysis comparing the 18F-NaF findings with the ones of the other methods was performed, and the results were classified as superior (>), equal (=), and inferior (<). Results Eleven patients had no bone metastases detected on any of the imaging methods used. Twenty patients presented SM depicted on 18F-NaF. Of these 20 patients, 12 performed bone scan (in 9 18F-NaF > BS and in 3 18F-NaF = BS), 1 performed 18F-FDG (18F-NaF > 18F-FDG), 4 performed 68Ga-Dotatate (in 2 18F-NaF > 68Ga-Dotatate and in 2 18F-NaF = 68Ga-Dotatate), 20 performed CT of at least one body segment (in 15 18F-NaF = CT and in 5 18F-NaF > CT), and 16 performed MRI of at least one body segment, and in all of them, the 18F-NaF was equal to the MRI. Beside this, the 18F-NaF detected SMin body segments not routinely scanned in MRI and CT. Conclusion In patients with MTC, the 18F-NaF seems to be equal or superior to other imaging modalities in the detection of SM and allows the analysis of the whole skeletal in a single study.