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Minimal circumscribed Hermitian ellipsoid of Hartogs domains and an application to an extremal problem

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Science China Mathematics 2009年第8期52卷 1699-1716页

作者： ahn heung-ju PARK Jong-do Department of Mathematical Sciences Seoul National University School of Mathematics Korea Institute for Advanced Study Hoegiro 87 Dongdaemun-gu Seoul 130-722 Korea

In this paper we construct circumscribed Hermitian ellipsoids of Hartogs domains of least volume and as an application, we obtain the Carathéodory extremal mappings between the Hartogs domains and the unit ball, and ... 详细信息

关键词： Hartogs domain minimal circumscribed Hermitian ellipsoid extremal problem 32H02 32F45

Maximizing biomass utilization: An integrated strategy for coproducing multiple chemicals

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Journal of Energy Chemistry 2025年第1期100卷 180-191页

作者： Byeongchan ahn Sua Jo Jonggeol Na J.Jay Liu Young-ju Kim Wangyun Won Department of Chemical and Biological Engineering Korea University Department of Chemical Engineering (Integrated process) Kyung Hee University Department of Chemical Engineering and Materials Science Ewha Womans University Department of Chemical Engineering Pukyong National University Resources Engineering Plant Research Department Korea Institute of Geoscience and Mineral Resources

Lignocellulosic biomass is one of the viable solutions to alleviate the global warming. However, the limited utilization of biomass majorly focused on cellulose and hemicellulose restricts the economic and environmental feasibilities. To cope with this issue, we proposed an integrated process of co-producing 1,6-hexanediol（1,6-HDO） with tetrahydrofuran and adipic acid from biomass, referred to as Strategy A. To compare the impacts of lignin upgrading and feedstock, Strategy B, which co-produces tetrahydrofuran alone, and Strategy C, which is the traditional route to produce 1,6-HDO from fossil fuels, were used. Heat networks are also designed to reduce operating costs and indirect carbon emissions due to energy consumption, saving 87% and 83% of the heat and cooling requirements, respectively, in Strategy A. The market competitiveness of Strategy A was evaluated by determining the minimum selling price through techno-economic analysis, and sustainability was thoroughly investigated by quantifying the environmental impacts through both midpoint and endpoint life-cycle assessments（LCAs）.Strategy A was found to be the most favorable both economically（USRDSCHARDOLLAR3,402/ton） and environmentally（-26.9 kg CO2eq.）. This indicates that lignin valorization is not only economically but also environmentally preferred. Finally, changes in economic and environmental feasibilities depending on economic, process, and environmental parameters were investigated using sensitivity and uncertainty analyses. The results of these analyses provide valuable insight into bio-based chemical production.

关键词： Biorefinery Carbon mitigation Climate change Global warming Lignin utilization Bioeconomy

Microstructure and Mechanical Properties of Hybrid Laser-Friction Stir Welding between AA6061-T6 Al Alloy and AZ31 Mg Alloy

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Journal of Materials Science & Technology 2011年第3期27卷 199-204页

作者： Woong-Seong Chang S.R.Rajesh Chang-Keun Chun heung-ju Kim Welding Research Center Research Institute of Industrial Science and Technology

For the purpose of improving the strength of this dissimilarjoint, the present study was carried out to investigate the improvement in intermetallic layer by using a third material foil between the laying edges of the friction stir welded and hybrid welded AI6061-T6/AZ31 alloy plates. The difference in microstructural and mechanical characteristics of friction stir welded and hybrid welded AI6061-TO/AZ31 joint was compared. Hybrid butt- welding of aluminum alloy plate to a magnesium alloy plate was successfully achieved with Ni foil as filler material, while defect-free laser-friction stir welding （FSW） hybrid welding was achieved by using a laser power of 2 kW. Transverse tensile strength of the joint reached about 66% of the Mg base metal tensile strength in the case of hybrid welding with Ni foil and showed higher value than that of the friction stir welded joint with and without the third material foil. This may be due to the presence of less brittle Ni-based intermetallic phases instead of Al12Mg17.

关键词： Frictions stir welding Laser welding Dissimilar metal joint Hybrid welding Magnesium alloy Aluminum alloy

Postpartum hemophagocytic lymphohistiocytosis:A case report

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World Journal of Clinical Cases 2023年第26期11卷 6183-6188页

作者： ju Ho An jung Hwan ahn Department of Emergency Medicine Ajou University School of MedicineSuwon 16499Gyeonggi-doSouth Korea

BACKGROUND Postpartum hemophagocytic lymphohistiocytosis(HLH)is a rare disease with unclear *** is a secondary HLH diagnosed using the pediatric diagnostic criteria;however,the clinical diagnosis of postpartum HLH remains ***,HLH may remain undiagnosed,leading to poor patient ***,improvements in the accuracy of postpartum HLH diagnoses and treatments are *** SUMMARY We report the case of a 40-year-old female with postpartum *** patient attended the postpartum care center for 3 wk after giving birth and underwent needle aspiration due to thyroid gland enlargement 11 d before an emergency department visit precipitated by fever and abdominal *** no abnormal emergency room findings were noted,the patient was discharged with a prescription for broad-spectrum *** days later,she returned to the emergency room in a hemodynamically unstable state and was admitted to the intensive care unit with suspected sepsis or hematologic *** patient was treated,without effect,for sepsis using broad-spectrum antibiotics,and for suspected hematologic disease with steroid ***,she died due to rapidly worsening *** Rapid recognition and appropriate treatment of postpartum HLH are needed to improve the prognosis.

关键词： Bone marrow Pregnancy Lymphohistiocytosis Infection Steroids Case report

Tailoring of Mechanical Properties of Indirect Hot Stamping Steel Tubes by Laser Assisted Local Rapid Heating

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Journal of Iron and Steel Research International 2016年第9期23卷 949-954页

作者： Mahmudun Nabi CHOWDHURY ju-ri KIM Sung-tae HONG Jin-wook juNG heung-nam HAN Sang-woo SO Schoolof Mechanical Engineering University of Ulsan Ulsan44610 South Korea Department of Materials Science & Engineering and Centre for Iron & Steel Research RIAM Seoul National University Seoul 08826 South Korea Automotive Parts Institute & Centre Ulsan Technopark Ulsan 44412 South Korea

The effect of laser assisted local heating on the mechanical properties of a hot stamping steel tube was in vestigated. A heated region with a spiral shape was generated on the surface of the tube by combining the linear movement of the laser and the rotation of the tube. The results of axial crush tests show that the laser assisted local heating can be effectively used to modify the mechanical performance of the tube. A microstructural analysis confirms that the laser locally induces a martensitic phase transformation in the heated region and results in inhomogeneous microstructures alon- the length of the tube.

关键词： local heating laser hot stamping steel tube

MYB46-Mediated Transcriptional Regulation of Secondary Wall Biosynthesis

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Molecular Plant 2012年第5期5卷 961-963页

作者： Jae-heung Ko Won-Chan Kim Joo-Yeol Kim Sung-ju ahn Kyung-Hwan Han Department of Plant and Environmental New Resources Kyung Hee University Yongin Korea Bioenergy Center Kyung Hee University Yongin Korea Department of Horticulture and Department of Forestry Michigan State University East Lansing MI 48824-1222 USA DOE-Great Lakes Bioenergy Research Center Michigan State University East Lansing MI 48824-1222 USA Department of Bioenergy Science and Technology (WCU) Chonnam National University 333 Yongbongro Buk-gu Gwangju 500-757 Korea

Formation of secondary wall requires coordinated transcrip- tional regulation of the genes involved in the biosynthesis of major secondary wall components （e.g. cellulose, hemicellu- lose, and lignin）. Even though many aspects of plant biology have been extensively elucidated using various model spe- cies, our current understanding of secondary wall formation is limited.

关键词：基因理解力木素社会控制正式生物学纤维素胰岛素

Alopecia treatment using minimally manipulated human umbilical cord-derived mesenchymal stem cells:Three case reports and review of literature

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World Journal of Clinical Cases 2021年第15期9卷 3741-3751页

作者： Hyunjun ahn Sang Yeon Lee Won ju jung Kye-Ho Lee bio Beauty&Health Company(bBHC)-Stem Cell Treatment&Research Institute(STRI) Seoul 04420South Korea Department of Functional Genomics University of Science and Technology KRIBB SchoolDeajeon 34113South Korea 97.7 Beauty&Health(B&H)Clinics Seoul 04420South Korea

BACKGROUND Alopecia areata(AA)is a common autoimmune disease characterized by hair *** appears in extensive forms,such as progressive and diffusing hair loss(diffuse AA),a total loss of scalp hair(alopecia totalis),and complete loss of hair over the entire body(alopecia universalis).Recently,mesenchymal stem cells(MSCs)have been identified as a therapeutic alternative for autoimmune *** this reason,preclinical and case studies of AA and related diseases using MSCs have been *** SUMMARY Case 1:A 55-year-old woman suffered from AA in two areas of the *** was given 15 rounds of minimally manipulated umbilical cord-MSCs(MM-UC-MSCs)over 6 *** AA gradually improved 3 mo after the first *** patient was cured,and AA did not *** 2:A 30-year-old woman,with history of local steroid hormone injections,suffered from AA in one area on the *** was given two rounds of MM-UC-MSCs over 1 *** AA immediately improved after the first *** patient was cured,and AA did not *** 3:A 20-year-old woman,who was diagnosed with alopecia universalis at the age of 12,was given 14 rounds of MM-UC-MSCs over 12 *** hair began to grow about 3 mo after the first *** patient was cured,and alopecia universalis did not *** MM-UC-MSC transplantation potentially treats patients who suffer from AA and related diseases.

关键词： Alopecia areata Umbilical cord-derived mesenchymal stem cells Allogenic Cell therapy Minimal manipulation Case report

Treatment of syringomyelia using uncultured umbilical cord mesenchymal stem cells: A case report and review of literature

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World Journal of Stem Cells 2022年第4期14卷 303-309页

作者： Hyunjun ahn Sang Yeon Lee Won-ju jung Kye-Ho Lee Stem Cell Treatment and Research Institute(STRI) bio Beauty and Health Company(bBHC)Seoul 04420South Korea Stem Cell Treatment 97.7 Beauty and Health ClinicSeoul 04420South Korea

BACKGROUND Syringomyelia is a disease caused by the formation of a cavity inside the spinal cord and is accompanied by such symptoms as pain,paresthesia,and urination and defecation disorders,and in severe cases causes various ***,there are only surgical methods for the treatment of syringomyelia,but these methods carry the possibility of failure,recurrence,and side *** SUMMARY The patient was a 59-year-old woman who suffered from pain due to *** treatment,the patient received transplant of uncultured umbilical cord-derived mesenchymal stem *** intended,the patient's pain was relieved after ***,an additional benefit was found in that the size of the cavity also *** 2 years from the last treatment,the patient's cavity had almost completely disappeared and her syringomyelia was deemed *** Using uncultured umbilical cord-derived mesenchymal stem cells may be a new treatment alternative for syringomyelia.

关键词： Syringomyelia Umbilical cord mesenchymal stem cells Cell therapy Allogenic stem cells Chiari malformations Case report

Super-resolution morphological dissemination of intercalating dye in single DNA molecules via binding activated localization microscopy

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Chinese Chemical Letters 2018年第3期29卷 505-508页

作者： Guenyoung Park Suresh Kumar Chakkarapani Soyeong ju Sujin ahn Seong Ho Kang Department of Chemistry Graduate School Kyung Hee University Department of Applied Chemistry and Institute of Natural Sciences Kyung Hee University

Fluorescent dye （YOYO-I） intercalated with single DNA molecules were investigated via bindingactivated localization microscopy （BALM） at sub-diffraction limit resolutions. Various dye-to-DNA base pair （bp） ratios were imaged using the blinking property of YOYO-1 dye under optimum BALM switching buffer conditions. Individual DNA molecules exhibited regular/irregular intercalating phenomena with respect to dye-to-DNA bp ratio. The acquired images were reconstructed into super-resolution images by applying a Gaussian fit to the centroid of the point spread function. The YOYO-1 intercalated with λ-DNA possessed a non-homogeneous region due to the different binding modes of YOYO-1 with λ-DNA. Each binding mode was imaged at the sub-diffraction limit super-resolution. The distance between homogenously localized intercalating dyes within the DNA molecules was measured to be 34nm （n= 10; dye：DNAbp= 1：100） without photocleavage in 50mmol/L β-mercaptoethylamine buffer. The results were similar to those of the theoretical values without photocleavage in the base pairs of single DNA molecules below the diffraction limit. The results paved the way for an in-depth microscopic analysis of molecular variation with single λ-DNA molecules. With this method, it should be possible to analyze the exact base pair breakdown during various stages of cell apoptosis.

关键词： λ-DNA Intercalating dye Morphological dissemination Sub-diffraction limit resolution Binding-activated localization microscopy