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Endoscopic retrograde cholangiopancreatography in pancreatic and biliary tract disease in Korean children

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World Journal of Gastroenterology 2010年第4期16卷 490-495页

作者： joo young jang Chong Hyun Yoon Kyung Mo Kim Department of Pediatrics Asan Medical Center Children's HospitalUniversity of Ulsan College of MedicineSeoul 138-736South Korea Department of Pediatrics Ajou University School of MedicineSuwon 443-721South Korea Department of Pediatric Radiology Asan Medical Center Children's HospitalUniversity of Ulsan College of MedicineSeoul 138-736South Korea Department of Pediatrics Asan Medical Center Children’s HospitalUniversity of Ulsan College of MedicineSeoul 138-736South Korea

AIM:To assess the indications,findings,therapeutic procedures,safety,and complications of endoscopic retrograde cholangiopancreatography(ERCP) performed in Korean ***:The demographic characteristics,indications for ERCP,findings,therapeutic procedures,and complications of 122 pediatric patients who underwent 245 ERCPs in the Asan Medical Center between June 1994 and March 2008 were ***:The mean age of the 122 patients was 8.0 ± 4.2 *** were biliary pathology in 78(64.0%),pancreatic pathology in 43(35.2%),and chronic abdominal pain in *** indications included choledochal cysts in 40,choledocholithiasis in 24,suspected sclerosing cholangitis in 8,trauma in 2,and other conditions in *** indications includedacute pancreatitis in 7,acute recurrent pancreatitis in 11,chronic pancreatitis in 20,trauma in 3,and pancreatic mass in *** the 245 ERCPs,success rate was 98.4% and 190(77.6%) were for therapeutic purposes,including endoscopic nasal drainage(51.8%),biliary sphincterotomy(38.0%),pancreatic sphincterotomy(23.3%),stent insertion(15.1%),stone extraction(18.8%),and balloon dilatation(11.0%).Complications were postERCP pancreatitis in 16(6.5%),ileus in 23(9.4%),hemorrhage in 2(0.8%),perforation in 2(0.8%),sepsis in 1(0.4%),and impacted basket in 1(0.4%).There were no procedure-related deaths,and most complications improved under supportive ***:This study showed that there is a high incidence of choledochal cyst and diagnostic and therapeutic ERCP for the management of various biliary and pancreatic diseases was safe and effective in Korean children.

关键词： Endoscopic retrograde cholangiopancreatography Pancreatic diseases Biliary tract diseases Choledochal cyst Pancreatitis Pediatrics

Plasmid DNA-loaded asymmetrically porous membrane for guided bone regeneration

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Journal of Materials Science & Technology 2021年第4期63卷 161-171页

作者： Se Heang Oh June-Ho Byun So young Chun young-joo jang Jin Ho Lee Department of Nanobiomedical Science Dankook UniversityCheonan 31116Republic of Korea Department of Oral and Maxillofacial Surgery Gyeongsang National University School of MedicineGyeongsang National University HospitalInstitute of Health SciencesGyeongsang National UniversityJinju 52727Republic of Korea BioMedical Research Institute Kyungpook National University HospitalDaegu 41404Republic of Korea Department of Advanced Materials Hannam UniversityDaejeon 34054Republic of Korea

Although bone defects can be restored spontaneously,bone reconstruction with sufficient strength and volume continues to be a challenge in clinical *** recent years,the use of a variety of biomaterials with bioactivity has been attempted to compensate for this ***,we fabricated a pDNA(encoding for BMP-2)-loaded asymmetrically porous polycaprolactone(PCL)/Pluronic F127 membrane as a bioactive guided bone regeneration(GBR)membrane,using a modified immersion-precipitation *** was observed that the GBR membrane allows continuous release of pDNA for more than20 *** pDNA was sufficiently transfected into human bone marrow stem cells(h BMSCs)without significant cytotoxicity and the gene-transfected cells showed prolonged synthesis of *** in vitro osteogenic differentiation and in vivo animal studies,the effective induction of osteogenic differentiation of h BMSCs and enhanced bone regeneration by the pDNA-loaded asymmetrically porous PCL/Pluronic F127 membrane was observed,suggesting that the pDNA-loaded membrane as a bioactive GBR membrane can be an alternative therapeutic technique for effective bone regeneration.

关键词： loaded porous attempted

Laser surface hardening of AISI H13 tool steel

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中国有色金属学会会刊：英文版 2009年第4期19卷 917-920页

作者： Jae-Ho LEE Jeong-Hwan jang Byeong-Don joo young-Myung SON young-Hoon MOON School of Mechanical Engineering Pusan National University

An attempt was made to improve the surface hardness and wear properties of AISI H13 tool steel through solid solution hardening and refinement of microstructures using a 200 W fiber laser as a heat generating *** hardness of laser melted zone was *** order to identify the effect of heat input on the laser melting zone,scanning conditions were *** results show that,the hardness of as-received AISI H13 tool steel is approximately Hv 240,and the hardness after laser surface heat treatment is around Hv *** hardening depth and width are increased with the increase in the heat input *** of experimental results will be considered in tooling industry.

关键词：激光表面硬化工具钢 H13 激光表面热处理表面硬度信息社会光纤激光器固溶强化

Effect of Laser Parameters on Sintered Powder Morphology

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Journal of Materials Science & Technology 2010年第4期26卷 375-378页

作者： Byeong-Don joo Jeong-Hwan jang Jae-Ho Lee young-Myung Son young-Hoon Moon Engineering Research Center for Net Shape and Die Manufacturing School of Mechanical EngineeringPusan National University

Selective laser sintering is a kind of rapid prototyping process whereby a three-dimensional part is built layerwise by laser scanning a powder. This process is highly inffuenced by powder and laser parameters such as laser power, scan rate, spot size and layer thickness. Therefore a study on fabricating a line with Fe-Ni-Cr powder on AISI H13 tool steel has been performed by selective laser sintering. In this study, fabrication was performed by experimental facilities consisting of a 200W fiber laser which can be focused to 0.08 mm and atmospheric chamber which can control atmospheric pressure with argon. The line was fabricated with various laser power, scan rate and layer thickness. Line width and surface quality were investigated. With power increase or layer thickness decrease, line width was decreased and line surface quality was improved with scan rate optimization.

关键词： Selective laser sintering Direct fabrication Fiber laser

Selective laser melting of Fe-Ni-Cr layer on AISI H13 tool steel

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中国有色金属学会会刊：英文版 2009年第4期19卷 921-924页

作者： Byeong-Don joo Jeong-Hwan jang Jae-Ho LEE young-Myung SON young-Hoon MOON School of Mechanical Engineering Pusan National University

An attempt to fabricate Fe-Ni-Cr coating on AISI H13 tool steel was performed with selective laser ***-Ni-Cr coating was produced by experimental facilities consisting of a 200 W fiber laser which can be focused to 80 μm and atmospheric chamber which can control atmospheric pressure with N2 or *** layer was fabricated with various process parameters such as laser power,scan rate and fill *** quality and coating thickness were measured and *** different surface patterns,such as typeⅠ,typeⅡand type Ⅲ,are shown with various test conditions and smooth regular pattern is obtained under the conditions as 10 μm of fill spacing,50-350 mm/s of scan rate and 40 μm of fill spacing,10-150 mm/s of scan *** maximum coating thickness is increased with power elevation or scan rate drop,and average thickness of 10 μm fill spacing is lower than that of 40 μm fill spacing.

关键词：镍铬涂层工具钢激光熔融社会扫描速度铁涂层厚度光纤激光器

Flow characteristics of aluminum coated boron steel in hot press forming

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中国有色金属学会会刊：英文版 2009年第4期19卷 913-916页

作者： Jeong-Hwan jang Jae-Ho LEE Bye ong-Don joo young-Hoon MOON School of Mechanical Engineering Pusan National University

The flow characteristics of aluminum coated boron steel in hot press forming were ***,the effects of aluminum coated layer on press forming were analyzed during deep *** results show that aluminum coated boron steel exhibits a high sensitivity on temperature and strain *** coating layer appears in surface flaking in a temperature range of 700-800 ℃,but smooth surface is formed above 900 ℃.

关键词：热压成型流动特性铝涂层硼钢表面剥落温度范围冲压成形高灵敏度

Stable carbon and nitrogen isotopic composition of gas hydrate-bearing sediment from Hydrate Ridge,Cascadia Margin

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Science China Earth Sciences 2006年第8期49卷 872-880页

作者： young-joo Lee Petroleum and Marine Resources Research Division Korea Institute of Geoscience and Mineral Resources Daejon 305-350South Korea

54 sediments were sampled at 5 sites, 1244, 1245, 1246,1250 and 1251 from ODPLeg 204, Hydrate Ridge, Cascadia Margin. The stable carbon and nitrogen isotopic composition,δ^(13)C of organic matter and δ^(15)N, have been used to characterize the depositional variationof sediments with gas hydrate bearing. Values of δ^(13)C of bulk organic matter range between-22.37 per thousand and -24.72 per thousand PDB, with a mean value of -23.54 ± 1.17 per thousandPDB; δ^(15)N of the same sedimentary samples range from 3.30 per thousand to 5.68 per thousand,with a mean value of 4.49 ± 1.19 per thousand; Values of C/N ratio range from 4.53 to 9.26, with amean value of 6.90 ± 2.37. The occurrence of gas hydrate changed the diagenetic evolution trend ofthe carbon and nitrogen in organic matter. The δ^(15)N and C/N ratio depletion suggest that thenitrogen fixation related with the bacteria/archaea maybe occurred in the sediments near thehydrate. The stable carbon and nitrogen isotopic composition could be used to evaluate thedepositional environment in the study area.

关键词： gas hydrate, carbon isotopes, nitrogen isotopes, C/N ratio, nitrogen fixation.

Application of direct laser metal tooling for AISI H13 tool stee

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中国有色金属学会会刊：英文版 2009年第B9期19卷 284-287页

作者： Jae-Ho LEE Jeong-Hwan jang Byeong-Don joo Hong-Sup YIM young-Hoon MOON School of Mechanical Engineering Pusan National University

In the die industry, it is commonly agreed that residual tool life can be successfully extended by timely repair of damaged surfaces. Traditionally, the main repair process is tungsten inert gas (TIG) welding, but a new process called direct laser metal tooling (DLMT) emerges. DLMT is a manual process, of which results depend on the materials of the powders and tools, the laser process and parameters. This technology is a direct-metal freeform fabrication technique in which a 200 W fiber laser is used. AISI H13 tool steel is a suitable material for die casting tools because of the high resistance to thermal fatigue and dimensional stability. In this research, AISI H13 tool steel was melted with metal powder by fiber laser. Before melting AISI H13, the powders were analyzed with XRF equipment. Then, hardness distribution of laser melted zone was investigated. The microstructure in laser melted zone was discussed. In order to identify the effect of particle size of powder on the melted zone, two types of particle sizes of powders were used. Experimental results show that the mold repair process using DLMT can be applied in the mold repair industry.

关键词：金属模具应用激光工具钢 H13 社会光纤激光器粉末材料修复过程

SUMS OF DUAL TOEPLITZ PRODUCTS ON THE ORTHOGONAL COMPLEMENTS OF FOCK-SOBOLEV SPACES

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Acta Mathematica Scientia 2024年第3期44卷 810-822页

作者：陈泳 young joo Lee Department of Mathematics Hangzhou Normal UniversityHangzhou311121China Department of Mathematics Chonnam National UniversityGwangju61186Korea

We consider dual Toeplitz operators on the orthogonal complements of the FockSobolev spaces of all nonnegative real ***,for symbols in a certain class containing all bounded functions,we study the problem of when an operator which is finite sums of the dual Toeplitz products is compact or ***,for bounded symbols,we construct a symbol map and exhibit a short exact sequence associated with the C^(*)-algebra generated by all dual Toeplitz operators with bounded symbols.

关键词： dual Toeplitz operators Fock-Sobolev spaces symbol map