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Propylene Polymerization by TiCl_4 Supported on Mg(OEt)_2 Activating with Ethanol/CO_2 System

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应用化学 2001年第5期18卷 310-315页

作者： Dong-hoLEE kwang-soo kim Department of Polymer Science Kyungpook UniversityTaegu 702-701Korea

In the preparation of catalyst for propylene polymerization, the Mg(OEt) 2 support was activated with ethanol/CO 2 system followed by solidification, and treated with TiCl 4 in the presence of ethylbenzoate as an internal donor(ID). The chemical compositions of the activated support and the prepared catalyst were examined in detail. During the dissolution of Mg(OEt) 2 support in ethanol medium with CO 2 bubbling, the structure of support changed to magnesium hydrocarbyl carbonate, (CH 3CH 2O) 2- x Mg(O (C O) OCH 2CH 3) x ( x = 1,2). The content of carbonated CO 2 in the activated support was dependent on the heat treatment in the solidification of support. In the preparation procedure of polymerization catalyst, the activated support was treated with TiCl 4 so that the structure of support was converted to MgCl 2 with the incorporation of ID. The polymerization behavior of the pre-pared catalyst was also studied in the presence of phenyltriethoxysilane as an external donor.

关键词：丙烯催化聚合聚丙烯乙醇镁四氯化钛负载型催化剂催化活性

Apolipoprotein A-I binding protein-mediated neuroprotection in glaucomatous neuroinflammation and neurodegeneration

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Neural Regeneration Research 2025年第5期20卷 1414-1415页

作者： Sinwoo Hwang Seunghwan Choi soo-Ho Choi Keun-Young kim Yury I.Miller Won-Kyu Ju Hamilton Glaucoma Center and Shiley Eye Institute The Viterbi Family Department of OphthalmologyUniversity of California San DiegoLa JollaCAUSA Department of Medicine University of California San DiegoLa JollaCAUSA National Center for Microscopy and Imaging Research Department of NeurosciencesUniversity of California San DiegoLa JollaCAUSA

Glaucoma is a multifactorial eye disorder that can cause vision loss and irreversible blindness,affecting individ uals aged 40 to 80 yea rs *** to the aging population,it is expected that the number of people affected by glaucoma will surpass 111 million by 2040 as the disease becomes more *** primarily contributes to optic nerve axon loss and the progressive degeneration of retinal ganglion cells (RGCs),subsequently leading to vision impairment.

关键词： irreversible pass primarily

Microstructure evolution and mechanical properties of Ti-B-N coatings deposited by plasma-enhanced chemical vapor deposition

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中国有色金属学会会刊：英文版 2012年第S3期22卷 722-728页

作者： Jung Ho SHIN kwang soo CHOI Tie-gang WANG kwang Ho kim Roman NOWAK National Core Research Center for Hybrid Materials Solution Pusan National University School of Materials Science and Engineering Pusan National University State Key Laboratory of Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences School of Chemical Technology Aalto University

Ternary Ti-B-N coatings were synthesized on AISI 304 and Si wafer by plasma-enhanced chemical vapor deposition (PECVD) technique using a gaseous mixture of TiCl4,BCl3,H2,N2,and *** virtue of X-ray diffraction analysis,X-ray photoelectron spectroscopy,scanning electron microscope,and high-resolution transmission electron microscope,the influences of B content on the microstructure and properties of Ti B N coatings were investigated *** results indicated that the microstructure and mechanical properties of Ti-B-N coatings largely depend on the transformation from FCC-TiN phase to HCP-TiB2 *** increasing B content and decreasing N content in the coatings,the coating microstructure evolves gradually from FCC-TiN/a-BN to HCP-TiB2 /a-BN via FCC-TiN+HCP-TiB2/*** highest microhardness of about 34 GPa is achieved,which corresponds to the nanocomposite Ti-63%B-N (mole fraction) coating consisting of the HCP-TiB2 nano-crystallites and amorphous BN *** lowest friction-coefficient was observed for the nanocomposite Ti-41%B-N (mole fraction) coating consisting of the FCC-TiN nanocrystallites and amorphous BN

关键词： Ti-B-N coating plasma-enhanced chemical vapor deposition (PECVD) nanocomposite coating hardness friction coefficient

Carcinoma in situ arising in a tubulovillous adenoma of the distal common bile duct: A case report

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World Journal of Gastroenterology 2008年第29期14卷 4705-4708页

作者： Bum-soo kim Sun-Hyung Joo kwang-Ro Joo Department of Surgery East-West Neo Medical Center University of KyungHee College of Medicine149 Sangil-dong Gangdong-gu Seoul 134-727 Korea Department of Internal Medicine East-West Neo Medical Center University of KyungHee College of Medicine149 Sangil-dong Gangdong-gu Seoul 134-727 Korea

Tubulovillous adenomas are common in the colon and rectum, but are rare in the common bile duct. Biliary adenomas may produce obstructive jaundice, which can be easily confused with a malignant neoplasm or stone. We report a case of a carcinoma in situ arising in a tubulovillous adenoma of the distal common bile duct causing obstructive jaundice. A 55-year-old male presented with a 10-d history of pruritus and progressive jaundice. Abdominal sonography and computed tomography showed a mass in the distal common bile duct. Endoscopic retrograde cholangiopancreatography showed luminal narrowing of the bile duct due to a polypoid mass. Positron emission tomography demonstrated no abnormal uptake. It was thought that this mass was a malignant tumor, thus a pylorus-preserving panceaticoduodenectomy was performed. The final pathology showed a tubulovillous adenoma with carcinoma in situ of the distal common bile duct. At follow-up 8 mo later, endoscopy showed multiple polyps in the rectum, colon and stomach. The polyps were removed by endoscopic mucosal resection and shown to be tubular adenomas with high grade dysplasia. Biliary adenomas require careful follow-up for early detection of recurrence and malignant transformation.

关键词： Common bile duct Adenoma Carcinomain situ

Distribution of electric field for carbon nanotube assembly: Experiments (II)

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 121-125页

作者： soongeun KWON soo-Hyun kim kwang-ho kim Myung-chang KANG Hyung-woo LEE Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

The distribution effect of electric field on the alignment and attachment of carbon nanotubes （CNTs） were investigated. The experimental results were compared with the simulation results according to three different shaped electrodes. In previous simulation, the round shaped electrodes were expected to be more effective for aligning and attaching a single CNT between two electrodes than conical or rectangular shaped electrodes. To verify the simulation results, three different shaped electrodes were introduced and a single multi-walled carbon nanotube （MWNT） was attached. The optimal conditions for aligning and attaching MWNTs such as the frequency, applied voltage and concentration of MWNTs solution were investigated. Through repeated experiments, frequency of 100 kHz-10 MHz, applied voltage of 0.3-1.3 V^s/~m, concentration of 5 ktg/mL in MWNTs solution were obtained as a possible condition range to attach MWNTs. Under these conditions, the yield of MWNTs attachment between two electrodes was up to 70%. In previous simulation, furthermore, it was verified that the size of the stable or quasi-stable region made CNTs aligned and attached on different shaped electrodes from the comparison of the experimental and simulation results. Most single MWNT attachment was accomplished on the round shaped electrodes.

关键词： carbon nanotubes dielectrophoresis round shaped electrode simulation

单向复合材料单搭接粘结节点的破坏预测及增强

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钢结构 2008年第7期23卷 85-85页

作者： kwang-soo kim Yeong-Moo Yi Gwang-Rae Cho Chun-Gon kim

提出了一种预测复合材料单搭接粘结节点在复合材料本体和粘结界面上破坏的方法。该方法采用了粘结剂和分层破坏判断的一个完全弹塑性模型,采用有限元方法和本文方法进行破坏预测。预测结果显示:破坏模式和强度都与各种粘结方法和参数下... 详细信息

提出了一种预测复合材料单搭接粘结节点在复合材料本体和粘结界面上破坏的方法。该方法采用了粘结剂和分层破坏判断的一个完全弹塑性模型,采用有限元方法和本文方法进行破坏预测。预测结果显示:破坏模式和强度都与各种粘结方法和参数下进行的节点模型试验结果吻合很好。基于数值分析,建立最佳节点强度条件,并提出一种新的提高节点强度的方法。验证结果表明:该方法可显著提高节点强度。

关键词：复合材料粘结节点破坏预测粘结破坏单搭接

Distribution of electric field for carbon nanotube assembly: Simulation (I)

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 117-120页

作者： soon-Geun KWON soo-Hyun kim kwang-Ho kim Myung-Chang KANG Hyung-Woo LEE Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon 305-701 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

The distribution of electric field for the alignment and attachment of carbon nanotubes (CNTs) was simulated. To be attached at the desired place, the aligned and attracted CNTs should be stayed in the desired area called the stable region or the quasi-stable region for an instant where the change of electric field is minimized. Since the conical electrode has the very narrow sized quasi-stable region, few CNTs can be attached. The rectangular electrodes have a wide stable region, so lots of CNTs can be attached. The results indicate that the round electrode which has a proper sized quasi-stable region is more effective for aligning and attaching a single CNT than the conical or rectangular shaped electrodes.

关键词： carbon nanotubes (CNTs) dielectrophoresis (DEP) round shaped electrode simulation

Obesity is an important determinant of severity in newly defined metabolic dysfunction-associated fatty liver disease

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Hepatobiliary & Pancreatic Diseases International 2022年第3期21卷 241-247页

作者： Ji Hye Huh kwang Joon kim Seung Up kim Bong-soo Cha Byung-Wan Lee Division of Endocrinology and Metabolism Department of Internal MedicineHallym University Sacred Heart HospitalAnyang 14068Korea Division of Geriatrics Department of Internal MedicineYonsei University College of MedicineSeoul 03722Korea Division of Endocrinology and Metabolism Department of Internal MedicineYonsei University College of MedicineSeoul 03722Korea Institute of Gastroenterology Department of Internal MedicineYonsei University College of MedicineSeoul 03722Korea

Background: The recently proposed definition of metabolic dysfunction-associated fatty liver disease(MAFLD) is based on the co-existence of hepatic steatosis with other metabolic disorders, including obesity and metabolic risk abnormalities such as hyperglycemia, high blood pressure and dyslipidemia. This study aimed to assess MAFLD severity according to the presence of metabolic abnormalities and obesity. Methods: Using transient elastography, hepatic steatosis and fibrosis severity were assessed by measuring the controlled attenuation parameter and liver stiffness measurement. A total of 1163 patients with MAFLD were categorized into the following four groups according to metabolic risk abnormalities and obesity presence: non-obese without metabolic risk abnormality group(Group 1;reference group);nonobese with metabolic risk abnormality group(Group 2);obese without metabolic risk abnormality group(Group 3);and obese with metabolic risk abnormality group(Group 4). A multiple logistic regression analysis was performed to determine severe hepatic steatosis and fibrosis risk in each group in both unadjusted and adjusted models. Results: In the adjusted model, the odds ratios(ORs) [95% confidence interval(CI)] for severe hepatic steatosis in Groups 2, 3, and 4 were 1.07(0.61-1.88), 2.43(1.44-4.08), and 4.07(2.56-6.48), respectively( P trend < 0.001). For liver fibrosis, compared with Group 1, Group 2 showed no significant increases in OR, whereas Groups 3 and 4(obese groups) showed significant increases(OR = 4.70, 95% CI: 1.24-17.82 and OR = 6.43, 95% CI: 1.88-22.02, respectively). Conclusions: Obesity, rather than metabolic abnormality, is the principal determinant of severe hepatic steatosis and fibrosis in patients with MAFLD.

关键词： Metabolic dysfunction-associated fatty liver disease Metabolically-healthy obesity Liver fibrosis

Expert recommendation system based on analyzing expertise and networks of human resources in National Science & Technology Information Service

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Journal of Central South University 2013年第8期20卷 2212-2218页

作者： YANG Myung-seok KANG Nam-kyu kim Yun-jeong kim Jae-soo CHOI kwang-nam kim Young-kuk NTIS Center Korea Institute of Science and Technology Information Department Of Computer Science and Engineering Chungnam National University

This work aims to implement expert and collaborative group recommendation services through an analysis of expertise and network relations NTIS. First of all, expertise database has been constructed by extracting keywords after indexing national R＆D information in Korea （human resources, project and outcome） and applying expertise calculation algorithm. In consideration of the characteristics of national R＆D information, weight values have been selected. Then, expertise points were calculated by applying weighted values. In addition, joint research and collaborative relations were implemented in a knowledge map format through network analysis using national R＆D information.

关键词： human networks network analysis NTIS R&D information