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PREPARATION AND PROPERTIES OF MMA/1-PROPYLMETHACRYLATE-POSS COPOLYMER WITH ATOM TRANSFER RADICAL POLYMERIZATION

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Chinese Journal of Polymer Science 2008年第5期26卷 533-537页

作者： He-xin Zhang Ho-young Lee Young-jun Shin Dong-ho Lee seok kyun noh Department of Polymer Science and Engineering Kyungpook National UniversityDaegu 702-701Korea School of Display and Chemical Engineering Yeungnam UniversityGyeongsan 712-749Korea

The methyl methacrylate(MMA)/1-propylmethacrylate-polyhedral oligomeric silsesquioxane(PM-POSS) copolymers were synthesized via atom transfer radical polymerization with CuBr as *** unreacted PM-POSS monomer could be removed completely by washing the copolymerization product with *** copolymers were characterized with ~1H-NMR,X-ray diffraction,differential scanning calorimetry,thermogravimetric analysis and gel permeation *** increasing PM-POSS feed ratio,the total conversi...

关键词： Methyl methacrylate(MMA) Polyhedral oligomeric silsesquioxane(POSS) Copolymer ATRP

含亚甲基桥的新型双核锆配合物的合成及其对乙烯聚合活性研究

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兰州大学学报（自然科学版） 2005年第6期41卷 138-140页

作者：卞凤玲于炜何侃侃 seok kyun noh 兰州大学化学化工学院甘肃兰州730000 School of Chemical Engineering and Technology Yeungnam University KyungsanKorea

新一代第4族茂金属配合物的发展对聚合催化剂的改进产生了深远的影响.茂金属催化体系不仅有高的催化活性,而且可以合成具有靶向特性(如分子量,分子量分布和立体化学)的聚合物[1].第4族控制几何构型催化剂(CGC)是单中心聚合催化剂,在特... 详细信息

新一代第4族茂金属配合物的发展对聚合催化剂的改进产生了深远的影响.茂金属催化体系不仅有高的催化活性,而且可以合成具有靶向特性(如分子量,分子量分布和立体化学)的聚合物[1].第4族控制几何构型催化剂(CGC)是单中心聚合催化剂,在特定条件下可通过乙烯终止及在相邻催化活性中心的再插入链转移反应键入聚合物链合成接枝聚乙烯[2],生成的含少量接枝链的聚乙烯具有优异的材料特性.近年来,大量研究[3～7]表明桥型双核茂金属聚合催化剂不仅具有单核茂金属聚合催化剂的优异性质,而且可由桥配体调节聚合特性.

关键词：乙烯聚合活性研究合成锆配合物亚甲基茂金属配合物催化活性中心聚合催化剂分子量分布双核

Comparative analysis on homogeneity of Pb and Cd in epoxy molding compounds

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 160-164页

作者： kyun-Gmee LEE Yong-Keun SON Jin-Sook LEE Tai-Min noh Hee-Soo LEE Department of Chemistry Sungkyunkwan University Department of Chemistry Yonsei University School of Materials Science and Engineering Pusan National University

Reference materials for quantitative determination of regulated heavy metals, such as Pb and Cd in electronic components, were designed and investigated in terms of stability and homogeneity. Reference materials with two concentration levels of heavy metals were prepared by spiking Pb and Cd compounds to epoxy molding compounds made by mixing silica powders and epoxy resin. The concentration changes of the reference materials during stability test for 1 a were not observed. In the homogeneity assessment, the as-prepared reference materials were studied by using three different analytical tools, inductively coupled plasma atomic emission spectrometry (ICP-AES), X-ray fluoroescence spectrometry (XRF) and laser ablation ICP mass. The results show different homogeneities by the characteristics of analytical tools and the materials.

关键词： epoxy molding compound Pb Cd reference materials homogeneity

Carbon and nitrogen dynamics in a Pinus densiflora forest with low and high stand densities

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Journal of Plant Ecology 2013年第5期6卷 368-379页

作者： Nam Jin noh Choonsig Kim Sang Won Bae Woo kyun Lee Tae kyung Yoon Hiroyuki Muraoka Yowhan Son Division of Environmental Science and Ecological Engineering Korea UniversitySeoul 136-713Republic of Korea River Basin Research Center Gifu UniversityGifu 501-1193Japan Department of Forest Resources Gyeongnam National University of Science and TechnologyJinju 660-758Republic of Korea Department of Forest Conservation Korea Forest Research InstituteSeoul 130-712Republic of Korea

Aims Understanding carbon(C)and nitrogen(N)dynamics and their dependence on the stand density of an even-aged,mature forest provides knowledge that is important for forest *** study investigated the differences in ecosystem total C and N storage and flux between a low-density stand(LD)and a high-density stand(HD)and examined the effects of stand density on aboveground net primary productivity(ANPP),total belowground C allocation(TBCA)and net ecosystem production(NEP)in a naturally regenerated,65-to 75-year-old Pinus densiflora *** *** LD(450 trees ha^(−1))and HD(842 trees ha^(−1))were established in an even-aged,mature *** forest in September *** forest had been naturally regenerated following harvesting,and the stand density was naturally maintained without any artificial management such as *** diameter at breast height(DBH≥5.0cm)of all live stems within the stands was measured yearly from 2007 to *** compare C and N storage and fluxes in LD and HD,C and N pools in aboveground and belowground biomass,the forest floor,coarse woody debris(CWD)and soil;soil CO_(2) efflux(R_(S));autotrophic respiration(R_(A));litter production;and soil N availability were ***,ANPP,TBCA and NEP were estimated from plot-based measurement *** Findings Ecosystem C(Mg C ha^(−1))and N(Mg N ha^(−1))storage was,respectively,173.0±7.3(mean±SE)and 4.69±0.30 for LD and 162±11.8 and 4.08±0.18 for *** were no significant differences in C and N storage in the ecosystem components,except for soils,between the two *** contrast,there were significant differences in aboveground ANPP and TBCA between the two stands(P<0.05).Litterfall,biomass increment and R_(S) were major C flux components with values of,respectively,3.89,3.74 and 9.07 Mg C ha^(−1) year^(−1) in LD and 3.15,2.94 and 7.06 Mg C ha^(−1) year^(−1) in ***-based NEP(Mg C ha^(−1) year^(−1))was 4.18 in LD and 5.50 in *** the even-aged,mature P

关键词： aboveground net primary productivity net ecosystem production Japanese red pine stand density total belowground carbon allocation

Long-term outcomes of endoscopic submucosal dissection and surgery for undifferentiated intramucosal gastric cancer regardless of size

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World Journal of Gastroenterology 2022年第8期28卷 840-852页

作者： Gil Ho Lee Eunyoung Lee Bumhee Park Jin Roh Sun Gyo Lim Sung Jae Shin Kee Myung Lee Choong-kyun noh Department of Gastroenterology Ajou University School of MedicineSuwon 16499South Korea Department of Biomedical Informatics Ajou University School of MedicineSuwon 16499South Korea Department of Pathology Ajou University School of MedicineSuwon 16499South Korea

BACKGROUND The clinical outcomes of endoscopic submucosal dissection(ESD)for undifferentiated(UD)intramucosal early gastric cancer(EGC)compared with those of surgery,regardless of lesion size,are not well ***,there is a concern regarding the treatment plan before and after ESD in cases of UD intramucosal EGC within expanded *** To evaluate clinical outcomes of ESD compared with those of surgery in UD intramucosal EGC patients regardless of tumor *** We enrolled patients with UD intramucosal EGC after ESD with complete resection or surgery from January 2005 to August 2020 who met the within or beyond expanded indications with lesion size>2 cm(the only non-curative factor).Overall,123 and 562 patients underwent ESD and surgery,*** propensity-score matching,clinical and long-term outcomes,i.e.,recurrencefree survival(RFS)and overall survival(OS),were *** multivariable Cox proportional hazard model with treatment modality and ESD indication was used to evaluate the recurrence *** After matching,119 patients each were finally enrolled in the ESD and surgery *** median length of hospital stay was shorter in the ESD group than surgery group(4.0 vs 9.0 days,P<0.001).Four cases of recurrence after ESD were local recurrences,all of which occurred within 1 *** recurrence was seven(5.9%)and two(1.7%)in the ESD and surgery groups,*** difference was observed between the two groups with respect to OS(P=0.948).However,the ESD group had inferior RFS compared with the surgery group(P=0.031).ESD was associated with the risk of recurrence after initial treatment in all enrolled patients(hazard ratio,5.2;95%confidence interval:1.0-25.8,P=0.045).CONCLUSION Although OS was similar between the two groups,surveillance endoscopy was important for the ESD than for the surgery group because RFS was inferior and local recurrence was an issue.

关键词： Early gastric cancer Undifferentiated cancer Expanded indication Endoscopic submucosal dissection Surgery

Impact of guideline adherence on the prognosis of Barcelona clinic liver cancer stage B hepatocellular carcinoma

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World Journal of Gastroenterology 2023年第47期29卷 6122-6137页

作者： Ji Eun Han Hyo Jung Cho Jae Youn Cheong Sun Gyo Lim Min Jae Yang Choong-kyun noh Gil Ho Lee Soon Sun Kim Department of Gastroenterology Ajou University School of MedicineSuwon 16499Gyeonggi-doSouth Korea

BACKGROUND Patients with Barcelona clinic liver cancer(BCLC)stage B hepatocellular carcinoma(HCC)are considerably heterogeneous in terms of tumor burden,liver function,and performance *** improve the poor survival outcomes of these patients,treatment approaches other than transarterial chemoembolization(TACE),which is recommended by HCC guidelines,have been adopted in realworld clinical *** hypothesize that this non-adherence to treatment guidelines,particularly with respect to the use of liver resection,improves survival in patients with stage B *** To assess guideline adherence in South Korean patients with stage B HCC and study its impact on *** A retrospective analysis was conducted using data from 2008 to 2016 obtained from the Korea Central Cancer *** with stage B HCC were categorized into three treatment groups,guideline-adherent,upward,and downward,based on HCC guidelines recommended by the Asian Pacific Association for the Study of the Liver(APASL),the European Association for the Study of the Liver(EASL),and the American Association for the Study of Liver Diseases(AASLD).The primary outcome was HCC-related deaths;tumor recurrence served as the secondary *** among the groups was compared using the Kaplan-Meier method and the log-rank *** of survival outcomes were identified using multivariable Cox regression *** In South Korea, over the study period from 2008 to 2016, a notable trend was observed in adherence to HCCguidelines. Adherence to the EASL guidelines started relatively high, ranging from 77% to 80% between 2008 and2012, but it gradually declined to 58.8% to 71.6% from 2013 to 2016. Adherence to the AASLD guidelines began at71.7% to 75.9% from 2008 to 2010, and then it fluctuated between 49.2% and 73.8% from 2011 to 2016. In contrast,adherence to the APASL guidelines remained consistently high, staying within the range of 90.14% to 94.5%throughout the entire study per

关键词： Hepatocellular carcinoma Barcelona clinic liver cancer stage B Guideline adherence Liver neoplasms Transarterial chemoembolization Liver resection

Successful resolution of gastric perforation caused by a severe complication of pancreatic walled-off necrosis:A case report

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世界临床病例杂志 2023年第26期11卷 6298-6303页

作者： Byeong Gwan noh Myunghee Yoon Young Mok Park Hyung-Il Seo Suk Kim Seung Baek Hong Jae kyun Park Moon Won Lee Department of Surgery Pusan National University School of MedicineBiomedical Research InstitutePusan National University HospitalBusan 49241South Korea Department of Radiology Pusan National University School of MedicineBiomedical Research InstitutePusan National University HospitalBusan 49241South Korea Department of Internal Medicine Pusan National University School of MedicineBiomedical Research InstitutePusan National University HospitalBusan 49241South Korea

BACKGROUND Pancreatic walled-off necrosis(WON)rarely causes critical gastric necrosis and perforation,which may develop when pancreatic WON squashes against the *** Atlanta 2012 guidelines were introduced for acute pancreatitis and its related clinical ***,there are few reported cases describing the clinical course and resolution of pancreatic *** SUMMARY We report the case of a 45-year-old man who presented to the urgent emergency department with gastric perforation caused by a severe complication of pancreatic WON on computed *** patient underwent an emergency distal pancreatectomy,splenectomy,and gastric wedge *** findings showed re-perforation of the gastric wall at a previously resected ***,endoscopic examination revealed an ulcerative area with a defect in the *** diagnostic endoscopy,endoscopic vacuum-assisted closure was performed,and continuous suction was transferred over all tissues in contact with the sponge *** patient recovered without any further complications and was discharged in good condition at postoperative week *** recurrence occurred during the 6-mo follow-up *** When managing a patient with serious gastric perforation complicated by pancreatic WON,a multidisciplinary treatment approach should be considered.

关键词： Acute necrotizing pancreatitis Endoscopy Vacuum assisted closure Gastric rupture Surgery Case report

Development of High Strength Steel in Hot Rolled Strip for Oil well Casing

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Development of High Strength Steel in Hot Rolled Strip for O...