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Hopf Hypersurfaces in Complex Two-Plane Grassmannians with Generalized Tanaka–Webster D-Parallel Shape Operator

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Acta Mathematica Sinica,English Series 2017年第1期33卷 61-70页

作者： Hyunjin LEE Eunmi PAK young jin suh Research Institute of Real&Complex Manifolds Kyungpook National UniversityDaegu 41566Republic of Korea Department of Mathematics Kyungpook National UniversityDaegu 41566Republic of Korea

In this paper, we consider a new notion of generalized Tanaka Webster З-parallel shape operator for a real hypersurface in a complex two-plane Grassrnannian and prove a non-existence theorem of a real hypersurface.

关键词： Complex two-plane Grassmannians real hypersurfaces generalized Tanaka-Webster con-nection parallel shape operator З-parallel shape operator

Commuting Structure Jacobi Operator for Real Hypersurfaces in Complex Two-plane Grassmannians

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Acta Mathematica Sinica,English Series 2015年第1期31卷 111-122页

作者： Carlos J.G.MACHADO Juan de Dios PREZ young jin suh Departamento de Geometria y Topologia Universidad de Granada Kyungpook National University Department of Mathematics

We classify real hypersurfaces in complex two-plane Grassmannians whose structure Jacobi operator commutes either with any other Jacobi operator or with the normal Jacobi operator.

关键词： Real hypersurfaces complex two-plane Grassmannians structure Jacobi operator normal Jacobi operator

Real Hypersurfaces in Complex Two-Plane Grassmannians Whose Jacobi Operators Corresponding to -Directions are of Codazzi Type

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Advances in Pure Mathematics 2011年第3期1卷 67-72页

作者： Carlos J. G. Machado Juan de Dios Pérez young jin suh 不详

We prove the non-existence of Hopf real hypersurfaces in complex two-plane Grassmannians whose Jacobi operators or the Jacobi corresponding to the directions in the distribution are of Codazzi type if they satisfy a further condition. We obtain that that they must be either of type (A) or of type (B) (see [2]), but no one of these satisfies our condition. As a consequence, we obtain the non-existence of Hopf real hypersurfaces in such ambient spaces whose Jacobi operators corresponding to -directions are parallel with the same further condition.

关键词： Real Hypersurfaces Complex Two-Plane Grassmannians Jacobi Operators Codazzi Type

Defining and tracing subtypes of patient-derived xenograft models in pancreatic ductal adenocarcinoma

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Cancer Communications 2024年第8期44卷 915-920页

作者： Sangyeop Hyun youngmin Han Jae Yun Moon young-Ah suh Won-Gun Yun Wooil Kwon Jong-Eun Lee Daeun Kim Ja-Lok Ku jin-young Jang Daechan Park Department of Molecular Science and Technology Ajou UniversitySuwonRepublic of Korea Department of Surgery and Cancer Research Institute Seoul National University College of MedicineSeoulRepublic of Korea Molecular Science and Technology Research Center Ajou UniversitySuwonRepublic of Korea DNA Link Inc. SeoulRepublic of Korea Korean Cell Line Bank Laboratory of Cell BiologyCancer Research InstituteSeoul National University College of MedicineSeoulRepublic of Korea

Patient-derived xenograft(PDX)models have been used to explore therapeutic opportunities for pancreatic ductal adenocarcinoma(PDAC)[1].Although original tumor characteristics are altered by cancer-stromal interactions... 详细信息

关键词： adenocarcinoma ductal xenograft

LAPAROSCOPIC SPHINCTER-SAVING PROCEDURE FOR LOW RECTAL CANCER

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LAPAROSCOPIC SPHINCTER-SAVING PROCEDURE FOR LOW RECTAL CANCE...

Alleviatory effect of isoquercetin on benign prostatic hyperplasia via IGF-1/PI3K/Akt/mTOR pathway

第六次全国大肠癌会议暨中日韩大肠癌会议

作者： Jun-Gi Kim young-jin suh Ki-Won suh Yong-Sung Won Yun-Bok Lee Woo-Bae Park Chung-Soo Chun Dept. of Surg. St. Vincent’s Hospital The Catholic University of KoreaSuwon Republic of Korea Dept. of Surg. St. Vincent’s Hospital The Catholic University of KoreaSuwon Republic of Korea Dept. of Surg. St. Vincent’s Hospital The Catholic University of KoreaSuwon Republic of Korea Dept. of Surg. St. Vincent’s Hospital The Catholic University of KoreaSuwon Republic of Korea Dept. of Surg. St. Vincent’s Hospital The Catholic University of KoreaSuwon Republic of Korea Dept. of Surg. St. Vincent’s Hospital The Catholic University of KoreaSuwon Republic of Korea Dept. of Surg. St. Vincent’s Hospital The Catholic University of KoreaSuwon Republic of Korea

＜正＞PURPOSE: High-dose preoperative radiotherapy has shown promising results in the treatment of low rectal cancer（LRC）. Laparoscopic procedure provides an enhanced view of the pelvic cavity that is not available by conventional method. We developed a sphincter-saving procedure combining the advantages of preoperative radiotherapy and laparoscopy for preserving anatomic and physiologic anal function. Our purpose is to show detailed information regarding procedure and early results. METHODS: From February 1996 to August 1997, eleven patients with LRC underwent the operation. Mean age was 56.1 years. Tumor located 4～8 cm from anal verge. All patients were treated with high-dose preoperative irradiation （4500～5040 cGy） over a period of 5 weeks. All were given our procedure four and a half to eight weeks after completion of radiation. Left colon and rectum were mobilized by laparoscopic oncologic dissection down to puborectalis muscle, after which specimen retrieval and coloanal anastomosis were performed transanally. We concluded with temporary transverse colostomy for fecal diversion. Careful follow-up of 4 to 21 months has so far been given. RESULTS: Every case was successful without any significant complication, and all revealed advantages of laparoscopy. There was one case of complete remission following radiation, and "five were stage Ⅰ, four stage Ⅱ, and one stage Ⅲ. Margin from the tumor was 1～5 cm distally, 19～32 cm proximally, 0.3～3.5 cm laterally. We had one local recurrence 11 months after operating. CONCLUSION: We have termed our procedure ’Laparoscopic Abdominal Transanal （LATA） Proctosigmoidectomy with coloanal anastomosis （LATA resection）’, and propose it as a functional and curative alternative for LRC while continuing to evaluate its efficacy.

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Food Science and Human Wellness 2024年第3期13卷 1698-1710页

作者： young-jin Choi Meiqi Fan Nishala Erandi Wedamulla Yujiao Tang Eun-Kyung Kim Department of Food Science and Nutrition Dong-A UniversityBusan 49315Republic of Korea Center for Silver-targeted Biomaterials Brain Busan 21 Plus programDong-A UniversityBusan 49315Republic of Korea Department of Health Sciences the Graduate School of Dong-A UniversityBusan 49315Republic of Korea Division of Food Bioscience College of Biomedical and Health SciencesKonkuk UniversityChungju 27478Republic of Korea Department of Export Agriculture Faculty of Animal Science and Export AgricultureUva Wellassa UniversityBadulla 90000Sri Lanka School of Bio-Science and Food Engineering Changchun University of Science and TechnologyChangchun 130600China Nutritional Education Major Graduate School of EducationDong-A UniversityBusan 49315Republic of Korea Nutrinomics Lab.Co. Ltd.Busan 49315Republic of Korea

We evaluated the effect of isoquercetin(quercetin-O-3-glucoside-quercetin,IQ)as a functional component of Abeliophyllum disistichum Nakai ethanol extract(ADLE)on prostate cell proliferation and apoptosis and its effects on the IGF-1/PI3K/Akt/mTOR pathway in benign prostatic hyperplasia(BPH).Metabolites in ADLE were analyzed using UHPLC-qTOF-MS and *** was orally administered(1 or 10 mg/kg)to a testosterone propionate-induced BPH rat model,and its effects on the prostate weight were *** effect of IQ on androgen receptor(AR)signaling was analyzed in LNCaP *** IGF-1 and IQ affect the IGF-1/PI3K/Akt/mTOR pathway in BPH-1 cells was also *** metabolites in ADLE were identified and quantified,which confirmed that ADLE contained abundant IQ(20.88 mg/g).IQ significantly reduced the prostate size in a concentration-dependent manner in a BPH rat model,and significantly decreased the expression of AR signaling factors in the rat prostate tissue and LNCaP cells in a concentration-dependent *** also inhibited the PI3K/AKT/mTOR pathway activated by IGF-1 treatment in BPH-1 *** BPH-1 cells,IQ led to G0/G1 arrest and suppressed the expression of proliferation factors while inducing ***,IQ shows potential for use as a pharmaceutical and nutraceutical for BPH.

关键词： Isoquercetin Benign prostatic hyperplasia Androgen receptor signaling PI3K/Akt/mtor pathway

Transparent high-performance piezoceramics through pressureless sintering

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Journal of Advanced Ceramics 2024年第5期13卷 561-567页

作者： Hye-Lim Yu Woo-Seok Kang Ju-Hyeon Lee Temesgen Tadeyos Zate young-jin Lee Bo-Kun Koo Dong-jin Shin Min-Soo Kim Soon-Jong Jeong young Ghyu Ahn Wook Jo Department of Material Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Energy Conversion Research Center Korea Electrotechnology Research InstituteChangwon 51543Republic of Korea MLCC Development Team Component Biz.UnitSamsung Electro-Mechanics Co.Ltd.Suwon 16674Republic of Korea

Piezoelectricity offers an electromechanical coupling that is widely utilized in transducer *** has been a consistent demand for transparent piezoelectric materials for optoelectrical ***,despite the inherent tradeoff between the transparency and the piezoelectricity,numerous strategies have been explored to develop the transparent piezoelectric ***,the most transparent piezoelectric materials developed to date is either a single crystal or materials that achieve transparency via hot-press sintering,limiting its industrial ***,we introduce a novel piezoelectric material that ensures transparency through co-doping and pressureless sintering of polycrystalline *** this study,we employed a compositional optimization approach to enhance the synergistic effect between the transparency and the piezoelectric properties of 0.71Pb(Mg_(1/3)Nb_(2/3))O_(3)–0.29PbTiO_(3)(PMN–0.29PT)*** utilizing the tape casting process for mass production and large-area manufacturing,our Pb_(0.913)La_(0.0145)Sm_(0.0145)(Mg_(1/3)Nb_(2/3))_(0.71)Ti_(0.29)O_(3)(TP2.9)ceramics exhibited over 60%transparency and large piezoelectric coefficient(d33)of 1104 pC/*** material holds considerable promise for a wide range of industrial applications in both the optical and electronic domains.

关键词： piezoelectric ceramics transparency pressureless sintering co-doping tape casting

The CUL3A–LFH1–UBC15 ubiquitin ligase complex mediates SHORT VEGETATIVE PHASE degradation to accelerate flowering at high ambient temperature

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Plant Communications 2024年第4期5卷 224-238页

作者： suhyun jin Geummin Youn Sun young Kim Taewook Kang Hyun-young Shin Ji-Yul Jung Pil Joon Seo Ji Hoon Ahn Department of Life Sciences Korea UniversitySeoul 02841Republic of Korea Department of Chemistry Seoul National UniversitySeoul 08826Republic of Korea These authors contributed equally to this article.

Ambient temperature affects flowering time in plants,and the MADS-box transcription factor SHORT VEGETATIVE PHASE(SVP)plays a crucial role in the response to changes in ambient *** protein stability is regulated by the 26S proteasome pathway and decreases at high ambient temperature,but the details of SVP degradation are ***,we show that SVP degradation at high ambient temperature is mediated by the CULLIN3–RING E3 ubiquitin ligase(CRL3)complex in Arabidopsis *** identified a previously uncharacterized protein that interacts with SVP at high ambient temperature and contains a BTB/POZ *** named this protein LATE FLOWERING AT HIGH TEMPERATURE 1(LFH1).Single mutants of LFH1 or CULLIN3A(CUL3A)showed late flowering specifically at 27***1 protein levels increased at high ambient *** found that LFH1 interacts with CUL3A in the cytoplasm and is important for SVP–CUL3A complex *** in CUL3A and/or LFH1 led to increased SVP protein stability at high ambient temperature,suggesting that the CUL3–LFH1 complex functions in SVP *** E2 ubiquitin-conjugating enzymes(UBCs)using RING-BOX PROTEIN 1(RBX1),a component of the CRL3 complex,as bait identified ***15 mutants also showed late flowering at high ambient *** vitro and in vivo ubiquitination assays using recombinant CUL3A,LFH1,RBX1,and UBC15 showed that SVP is highly ubiquitinated in an ATP-dependent ***,these results indicate that the degradation of SVP at high ambient temperature is mediated by a CRL3 complex comprising CUL3A,LFH1,and UBC15.

关键词： temperature-responsiveflowering SVP CUL3 proteasomal degradation ubiquitination

Chemical and mechanical properties of stainless, environment-friendly, and nonflammable Mg alloys (SEN alloys): A review

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Journal of Magnesium and Alloys 2024年第3期12卷 841-872页

作者： Jong Un Lee Hyun Ji Kim Sang-Cheol jin Ye jin Kim young Min Kim Bong Sun You Jun Ho Bae Sung Hyuk Park Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Metallurgical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Missile Research Institute Agency for Defense DevelopmentDaejeon 34060Republic of Korea

This review article provides overall understanding of stainless,environment-friendly,and nonflammable Mg alloys(SEN alloys)recently developed at the Korea Institute of Materials *** alloys are produced by adding small amounts of Ca and Y(each<1 wt%)into commercial Mg–Al based alloys,resulting in exceptional ignition and corrosion resistances and impressive mechanical *** main advantages of SEN alloys are as follows.(1)A dense multi-oxide layer of SEN alloys comprising MgO,CaO,and Y_(2)O_(3) impedes the outward dispersion of Mg vapor and the inward penetration of O_(2) during oxidation,thereby enhancing the oxidation and ignition resistances.(2)The presence of Ca-and Y-based second-phase particles in SEN alloys can enhance their corrosion resistance because Ca-containing particles prevent the spread of corrosion,and the replacement of Al-containing particles with less noble ones containing Y(e.g.,Al–Mn–Y or Al–Y particles)retards corrosion.(3)The addition of minor amounts of Ca and Y renders excellent mechanical properties due to improved strengthening *** enhanced properties are attributed to more pronounced dynamic recrystallization and grain refining behaviors caused by the second-phase particles during extrusion.(4)Despite the presence of various types of second-phase particles,the fatigue properties of SEN9 alloys are similar to those of commercial AZ91 alloys.(5)Simultaneous introduction of Ca and Y suppresses the formation of Mg17Al12 discontinuous precipitates during aging,leading to the enhanced elongation of aged SEN alloys.(6)Adding mischmetal into the SEN9 alloy leads to a six-fold enhancement in ***,the studies conducted on SEN alloys demonstrate their excellent ignition and corrosion resistances and mechanical properties,which broaden the industrial applications of Mg alloys by addressing their inherent weaknesses.

关键词： SEN magnesium alloy Corrosion resistance Ignition resistance Mechanical properties Extrudability.