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Microstructure of porous Cu fabricated by freeze-drying process of CuO/camphene slurry

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中国有色金属学会会刊：英文版 2012年第S3期22卷 688-691页

作者： Sung-tag OH Si-young CHANG myung-jin suk Department of Materials Science and Engineering Seoul National University of Science and Technology Department of Materials Engineering Korea Aerospace University Department of Materials and Metallurgical Engineering Kangwon National University

Porous Cu with macroscopically aligned channels was synthesized using a freeze-drying ***-based CuO slurry was prepared by milling at 60 °C with a small amount of *** of a slurry was done at 25 °C while unidirectionally controlling the growth direction of the *** were generated subsequently by sublimation of the camphene during *** green body was hydrogen-reduced at 300 °C for 30 min,and sintered in the furnace at 700 °C for 1 h under a hydrogen *** observation reveals that all of the sintered samples are composed of only Cu phase and show macroscopic open pores with an average size of 100 μm which are aligned along its macroscopic growth *** internal wall of the macroscopic aligned pore shows relatively small pores due to the traces of the camphene left between the concentrated Cu particles on the internal *** in the porosity and pore size with increasing camphene content was explained by the change of the growth behavior of the camphene crystals.

关键词： porous Cu CuO-camphene slurry freeze-drying hydrogen reduction sintering

SUBic:A Scalable Unsupervised Framework for Discovering High Quality Biclusters

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Journal of Computer Science & Technology 2013年第4期28卷 636-646页

作者： Jooil Lee Yanhua jin Won suk Lee Department of Computer Science Yonsei University

A biclustering algorithm extends conventional clustering techniques to extract all of the meaningful subgroups of genes and conditions in the expression matrix of a microarray dataset. However, such algorithms are very sensitive to input parameters and show poor scalability. This paper proposes a scalable unsupervised biclustering framework, SUBic, to find high quality constant-row biclusters in an expression matrix effectively. A one-dimensional clustering algorithm is proposed to partition the attributes, that is, columns of an expression matrix into disjoint groups based on the similarity of expression values. These groups form a set of short transactions and are used to discover a set of frequent itemsets each of which corresponds to a bicluster. However, a bicluster may include any attribute whose expression value is not similar enough to others, so a bicluster refinement is used to enhance the quality of a bicluster by removing those attributes based on its distribution of expression values. The performance of the proposed method is comparatively analyzed through a series of experiments on synthetic and real datasets.

关键词： biclustering clustering expression matrix frequent itemset sub-matrix

Impact of Spectral Nudging on the Downscaling of Tropical Cyclones in Regional Climate Simulations

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Advances in Atmospheric Sciences 2016年第6期33卷 730-742页

作者： suk-jin CHOI Dong-Kyou LEE Atmospheric Sciences Program School of Earth and Environmental SciencesKorea-USA Weather and Climate Research Center Seoul National University

This study investigated the simulations of three months of seasonal tropical cyclone （TC） activity over the western North Pacific using the Advanced Research WRF Model. In the control experiment （CTL）, the TC frequency was considerably overestimated. Additionally, the tracks of some TCs tended to have larger radii of curvature and were shifted eastward. The large-scale environments of westerly monsoon flows and subtropical Pacific highs were unreasonably simulated. The overestimated frequency of TC formation was attributed to a strengthened westerly wind field in the southern quadrants of the TC center. In comparison with the experiment with the spectral nudging method, the strengthened wind speed was mainly modulated by large-scale flow that was greater than approximately 1000 km in the model domain. The spurious formation and undesirable tracks of TCs in the CTL were considerably improved by reproducing realistic large-scale atmospheric monsoon circulation with substantial adjustment between large-scale flow in the model domain and large-scale boundary forcing modified by the spectral nudging method. The realistic monsoon circulation took a vital role in simulating realistic TCs. It revealed that, in the downscaling from large-scale fields for regional climate simulations, scale interaction between model-generated regional features and forced large-scale fields should be considered, and spectral nudging is a desirable method in the downscaling method.

关键词： tropical cyclone spectral nudging technique dynamic downscaling regional climate simulation

Enterovenous fistulization: A rare complication of Crohn's disease

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World Journal of Gastroenterology 2011年第47期17卷 5227-5230页

作者： Jeong Woo Lim Kyung-Jo Kim Byong Duk Ye Jeong-Sik Byeon Seung-Jae myung suk-Kyun Yang jin Ho Kim Division of Gastroenterology Department of Internal Medicine University of Ulsan College of Medicine Asan Medical Center

The presence of hepatic portal venous gas (HPVG) is associated with numerous diseases, and has been regarded as a serious, even catastrophic condition. However, anecdotal reports mention that some patients with inflammatory bowel disease (IBD), who developed HPVG after diagnostic examinations of the colon, were successfully managed with antibiotic therapy and have followed benign courses. In contrast, among IBD patients, the development of HPVG is rarely caused by enterovenous fistula. We describe a 32-year-old man with Crohn's ileocolitis who presented with hypotension and fever associated with HPVG, as well as superior mesenteric vein thrombosis, possibly caused by enterovenous fistula, who was successfully managed by surgery. We also review the literature concerning portal venous gas associated with Crohn's disease.

关键词： Crohn's disease Enterovenous fistula Portal venous gas

Addition of cerium and yttrium to ferritic steel weld metal to improve hydrogen trapping efficiency

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International Journal of Minerals,Metallurgy and Materials 2017年第4期24卷 415-422页

作者： Sung jin Kim Kang Mook Ryu Min-suk Oh Department of Advanced Materials Engineering Sunchon National University Jungang-ro Suncheon 540-742 Republic of Korea POSCO Steel Solution Marketing Division Geidong-Dong Pohang 790-704 Republic of Korea Automotive Components & Materials R&D Group Korea Institute of Industrial Technology 6 Cheomdan-gwagiro 208 beon-gil Gwangju 61012 Republic of Korea

The applicability of Ce and Y as promising candidate elements to form irreversible traps in weld metal was investigated by thermal desorption spectroscopy(TDS) with gas chromatography(GC). The precise nature of the precipitate particles newly formed in the weld metal by the addition of Ce and Y to a certain alloy system was characterized. Moreover,the hydrogen trapping efficiency expressed as the reduction of the diffusible hydrogen in the weld metal was analyzed. The results showed that the addition of Ce and/or Y to this alloy system led to the formation of a mixed type of(Ce,Ti)-based oxide,(Y,Ni)-based carbide,or(Ce,Y,Ti)-based oxide particles. Because of the high activation energy of the mixed type of particles(≥ 150 k J/mol),the trapping efficiency for hydrogen was considered to be sufficiently high to effectively reduce the diffusible hydrogen content.

关键词： hydrogen trapping weld rare earth metals cerium yttrium activation energy

Wear characteristics of Ⅴ shape diamond tool for micro prism pattern with Al alloys

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中国有色金属学会会刊：英文版 2012年第S3期22卷 769-774页

作者： Eun-suk PARK Tae-jin JE Hwan-jin CHOI Eun-Chae JEON myung-Chang KANG Nano-Mechatronics University of Science & Technology Division of Nano-Mechanical Systems Korea Institute of Machinery and Materials National Core Research Center for Hybrid Materials Solution Pusan National University

The ultra-precision machining process using a single crystal diamond tool has been mainly used for machining molds of optical *** the micro patterns of various shapes having excellent surface roughness can be machined by using ultra-precision machine tools,the micro pattern on a large light guide plate (LGP) is mainly machined using a diamond *** tool wear occurs due to long machining distances and time while machining a large-area LGP *** deformation and dimensional error of micro pattern are caused by tool wear,as a result,the light efficiency of LGP *** characteristics of tool wear should be analyzed in order to precisely machine large-area LGP mold from all sorts of *** experiments were performed in order to compare wear characteristics of a V90° diamond tool using Al3003,5052,6061 and *** prism pattern of depth 10 μm was machined in order to analyze characteristics of tool wear according to machining distances (0.5,1 and 1.5 km).The effects of tool wear on pattern shape were analyzed by applying overlapped cutting depths (Rough machining is (10+8+7) μm and Finish machining is (5+3+2+1) μm) by continuously machining a prism pattern of W shape of 25 μm in depth.

关键词： diamond tool wear Al alloys micro prism pattern planer

Graphene quantum dots/Ni(OH)_(2) nanocomposites on carbon cloth as a binder-free electrode for supercapacitors

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Journal of Materials Science & Technology 2020年第23期58卷 73-79页

作者： Yiwen Hong jingli Xu jin suk Chung Won Mook Choi School of Chemical Engineering University of Ulsan93 Daehak-ro Nam-guUlsan44610Republic of Korea College of Chemistry and Chemical Engineering Shanghai University of Engineering ScienceLongTeng Road 333201620ShanghaiPR China

Graphene quantum dots(GQDs)/Ni(OH)_(2) composites on carbon cloth(G-NH//CC) are prepared through simple hydrothermal reactions. The resulting G-NH//CC is employed as a binder-free electrode of supercapacitors. Due to the enhanced electrical conductivity and efficient ion transport by the addition of GQDs, the G-NH//CC electrode exhibits enhanced electrochemical performances. Specifically, the GNH//CC delivers a maximum specific capacitance of 1825 F g^(-1) at a current density of 1 A g^(-1) as well as a good cycle stability of 83.5 % capacity retention after 8000 cycles. Additionally, all-solid-state symmetric supercapacitor(SSC) is assembled with G-NH//CC composites as both positive and negative *** fabricated SSC exhibits a high energy density of 80.8 Wh kg^(-1)at a power density of 2021 W kg^(-1). The present study provides a facile and efficient strategy to prepare high-performance electrode materials for advanced electrochemical energy storage devices.

关键词： Graphene quantum dots Ni(OH)_(2) Carbon clothes Symmetric supercapacitors

Distribution of Chancelloriids in a Middle Cambrian Carbonate Platform Deposit, Taebaek Group, Korea

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Acta Geologica Sinica(English Edition) 2016年第3期90卷 783-795页

作者： HONG Jongsun CHOH suk-Joo LEE Dong-jin Department of Earth and Environmental Sciences Korea University Department of Earth and Environmental Sciences Andong National University

The onset of the Cambrian witnessed the diversification of ＂small shelly fossils （SSF）＂, which affected carbonate depositional system. One of the problematic SSF, chancelloriids, are common components of the early to middle Cambrian carbonate and shale, and their contributions toward Cambrian carbonates are not yet fully understood. This study assesses distribution patterns of chancelloriid sclerites in the Cambrian Series 3 Daegi Formation based on microfacies analysis and discusses their sedimentologic implications. In the lower part of the formation, partially articulated chancelloriid sclerites occur mainly in bioclastic packstone and grainstone facies, with isolated sclerite rays in nodular packstone to grainstone facies. In the middle part of the formation, chancelloriid fragments occur only sporadically in bioclastic wackestone to packstone, bioclastic grainstone and oolitic packstone to grainstone facies, whereas boundstone facies are nearly devoid of their fragments. There are no chancelloriid fragments in the upper part of the formation, which consists of oolitic packstone to grainstone facies. Chancelloriids are interpreted to have primarily occupied platform margin shoal environments, shedding their sclerites to surrounding areas, and thus contributed as sediment producers. The distribution of Daegi chancelloriid sclerites is similar to other Cambrian examples, with the exception of common chancelloriids in Cambrian Series 2 reefs and their apparent near absence in the Daegi and other Cambrian Series 3 reefs. This disparity resulted from changes in the ecologic niche of chancelloriids after the end-Cambrian Series 2 reef crisis, coupled with an overall decline of chancelloriids in the middle Cambrian.

关键词： Cambrian Series 3 chancelloriid shoal carbonate platform reef

Pseudomembranous conjunctivitis in a patient with DRESS syndrome

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International Journal of Ophthalmology(English edition) 2023年第2期16卷 309-311页

作者： Young Joo Lee Youngsub Eom Seo Yeon Park Jung jin Shin Young Choi Jong suk Song Hyo myung Kim Department of Ophthalmology Korea University Ansan HospitalGyeonggi-do 15535Republic of Korea Department of Ophthalmology Korea University College of MedicineSeoul 02841Republic of Korea Department of Ophthalmology Emory University School of MedicineAtlantaGA 30322USA BGN Jamsil Lotte Tower Eye Clinic Seoul 05551Republic of Korea Department of Dermatology Korea University Ansan HospitalGyeonggi-do 15355Republic of Korea Shin’s Eye Clinic Chungcheongnam-do 31513Republic of Korea

Dear Editor,Drug rash with eosinophilia and systemic symptoms(DRESS)syndrome is a drug reaction featuring high fever,eosinophilia,skin rashes,and multi-organ involvement that may be *** manifestations,including cicatrizing conjunctivitis,corneal infiltration,and anterior uveitis,are rarely reported[1-6]but may cause serious complications if ***,it is important to diagnose DRESS syndrome in patients with ocular features promptly with appropriate *** article reports a case diagnosed with DRESS syndrome associated with pseudomembranous conjunctivitis secondary to carfilzomib.

关键词： membranous conjunctivitis involvement