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Hepatectomy vs radiofrequency ablation for colorectal liver metastasis:A propensity score analysis

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World Journal of Gastroenterology 2015年第11期21卷 3300-3307页

作者： Huisong Lee Jin Seok Heo yong beom cho Seong Hyeon Yun Hee Cheol Kim Woo yong Lee Seong Ho choi Dong Wook choi Department of Surgery Samsung Medical CenterSungkyunkwan University School of Medicine

AIM:To compare outcomes from radiofrequency ablation(RFA) and hepatectomy for treatment of colorectal liver metastasis(CRLM).METHODS:From January 2000 to December 2009,408 patients underwent curative intent treatment for *** excluded patients using the criteria:size of CRLM > 3 cm,number of CRLM ≥ 5,percutaneous RFA,follow-up period 2 cm) CRLM(P = 0.034).However,survival curves were similar for single or small(≤ 2 cm) CRLM(P = 0.714,P = 0.740).CONCLUSION:Hepatectomy is better than RFA for the treatment of ***,RFA might be suitable for selected patients with single,small(≤ 2 cm) CRLM.

关键词： Colorectal neoplasm Metastasis Catheter ablation H

Surgical outcomes of Korean ulcerative colitis patients with and without colitis-associated cancer

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World Journal of Gastroenterology 2015年第12期21卷 3547-3553页

作者： yong Sik Yoon yong beom cho Kyu Joo Park Seung Hyuk Baik Sang Nam Yoon Seung-Bum Ryoo Kil Yeon Lee Hungdai Kim Ryung-Ah Lee Chang Sik Yu Department of Colon and Rectal Surgery University of Ulsan College of Medicine and Asan Medical Center epartment of Surgery Samsung Medical Center Sungkyunkwan University School of Medicine Department of Surgery Seoul National University College of Medicine Department of Surgery Yonsei University College of Medicine Severance Hospital Department of Surgery Kangnam Sacred Heart Hospital Hallym University College of Medicine Department of Surgery Kyung Hee University School of Medicine Department of Surgery Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine Department of Surgery Ewha Womans University School of Medicine

AIM: To determine the clinicopathologic characteristics of surgically treated ulcerative colitis(UC) patients, and to compare the characteristics of UC patients with colitis-associated cancer(CAC) to those without CAC. METHODS: Clinical data on UC patients who underwent abdominal surgery from 1980 to 2013 were collected from 11 medical institutions. Data were analyzed to compare the clinical features of patients with CAC and those of patients without ***: Among 415 UC patients, 383(92.2%) underwent total proctocolectomy, and of these, 342(89%) were subjected to ileal pouch-anal anastomosis. CAC was found in 47 patients(11.3%). Adenocarcinoma was found in 45 patients, and the others had either neuroendocrine carcinoma or lymphoma. Comparing the UC patients with and without CAC, the UC patients with CAC were characteristically older at the time of diagnosis, had longer disease duration, underwent frequent laparoscopic surgery, and were infrequently given preoperative steroid therapy(P < 0.001-0.035). During the 37 mo mean follow-up period, the 3-yearoverall survival rate was 82.2%.CONCLUSION: Most Korean UC patients experience early disease exacerbation or complications. Approximately 10% of UC patients had CAC, and UC patients with CAC had a later diagnosis, a longer disease duration, and less steroid treatment than UC patients without CAC.

关键词： Ulcerative colitis Colorectal neoplasms Colorectal

Repeat hepatic resection in patients with colorectal liver metastases

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World Journal of Gastroenterology 2015年第7期21卷 2124-2130页

作者： Huisong Lee Seong Ho choi yong beom cho Seong Hyeon Yun Hee Cheol Kim Woo yong Lee Jin Seok Heo Dong Wook choi Kyung Uk Jung Ho-Kyung Chun Department of Surgery Samsung Medical Center Sungkyunkwan University School of Medicine Department of Surgery Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine

AIM:To investigate the survival outcomes of secondaryhepatectomy for recurrent colorectal liver metastases(CRLM).METHODS:From October 1994 to December 2009,patients with CRLM who underwent surgical treatment with curative intent were *** were divided into two groups:patients who underwent primary hepatectomy(Group 1)and those who underwent secondary hepatectomy for recurrent CRLM(Group 2).RESULTS:Survival and prognostic factors were analyzed.A total of 461 patients were included:406patients in Group 1 and 55 patients in Group *** a median 39-mo(range,3-195 mo)follow-up,there was a significant difference between Groups 1 and 2in terms of disease-free survival(P=0.029)although there was no significant difference in overall survival(P=0.206).Secondary hepatectomy was less effective in patients with multiple recurrent CRLM than primary hepatectomy for initial CRLM(P=0.008).Multiple CRLM and radiofrequency ablation therapy were poor prognostic factors of secondary hepatectomy in multivariate Cox regression analysis(P=0.006,P=0.004,respectively).CONCLUSION:Secondary hepatectomy for single recurrent CRLM is as effective as primary surgical treatment for single recurrent ***,secondary hepatectomy for multiple recurrent CRLM is less effective than that for single recurrent CRLM.

关键词： Colorectal neoplasm Metastasis Recurrence Hepatect

Finite Group Action and Gromov-Witten Invariants in Symplectic Four-Manifolds

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Acta Mathematica Sinica,English Series 2010年第12期26卷 2325-2334页

作者： yong Seung cho Department of Mathematics Ewha Womans University

Let a finite group act semi-freely on a closed symplectic four-manifold with a 2-dimensional fixed point set. Then we show that the relative Gromov-Witten invariants are the same as the invariants on the quotient set-... 详细信息

关键词： Finite group action Gromov-Witten invariant symplectic four-manifold

Thermodynamic model for deoxidation of liquid steel considering strong metal-oxygen interaction in the quasichemical model framework

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 988-1002页

作者： yong-Min cho Youn-Bae Kang Graduate Institute of Ferrous and Eco Materials Technology Pohang University of Science and TechnologyPohangKyungbuk37673Rep.of Korea N.EX.T Hub POSCO HoldingsPohangKyungbuk37673Rep.of Korea Department of Materials Science and Engineering Pohang University of Science and TechnologyPohangKyungbuk37673Rep.of Korea

Herein,a thermodynamic model aimed at describing deoxidation equilibria in liquid steel was *** model provides explicit forms of the activity coefficient of solutes in liquid steel,eliminating the need for the minimization of internal Gibbs energy preliminarily when solving deoxidation *** elimination of internal Gibbs energy minimization is particularly advantageous during the coupling of deoxidation equilibrium calculations with computationally intensive approaches,such as computational fluid *** model enables efficient calculations through direct embedment of the explicit forms of activity coefficient in the computing *** proposed thermodynamic model was developed using a quasichemical approach with two key approximations:random mixing of metallic elements(Fe and oxidizing metal) and strong nonrandom pairing of metal and oxygen as nearest *** these approximations,the quasichemical approach yielded the activity coefficients of solutes as explicit functions of composition and temperature without requiring the minimization of internal Gibbs energy or the coupling of separate *** model was successfully applied in the calculation of deoxidation equilibria of various elements(Al,B,C,Ca,Ce,Cr,La,Mg,Mn,Nb,Si,Ti,V,and Zr).The limitations of the model arising from these assumptions were also discussed.

关键词： deoxidation equilibria thermodynamics quasichemical approach computational fluid dynamics

Flexible highly-effective energy harvester via crystallographic and computational control of nanointerfacial morphotropic piezoelectric thin film

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Nano Research 2017年第2期10卷 437-455页

作者： Chang Kyu Jeong Sung beom cho Jae Hyun Han Dae yong Park Suyoung Yang Kwi-II Park Jungho Ryu Hoon Sohn yong-Chae Chung Keon Jae Lee Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea KAISTInstitute for the NanoCentury (KINC) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea Division of Materials Science and Engineering Hanyang University 222 Wangsimni-ro Seongdong-gu Seou104763 Republic of Korea Department of Civil and Environmental Engineering KAIST 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea Department of Energy Engineering Gyeongnam National University of Science and Technology 33 Dongjin-ro Jinju Gyeongnam 52725 Republic of Korea Functional Ceramic Group Korea Institute of Materials Science (KIMS) 797 Changwon-daero Seongsan-gu Changwon Gyeongnam.51508 Republic of Korea

Controlling the properties of piezoelectric thin films is a key aspect for designing highly efficient flexible electromechanical devices. In this stud）~ the crystallographic phenomena of PbZr1-xTixO3 （PZT） thin films caused by distinguished interfacial effects are deeply investigated by overlooking views, including not only an experimental demonstration but also ab initio modeling. The polymorphic phase balance and crystallinity, as well as the crystal orientation of PZT thin films at the morphotropic phase boundary （MPB）, can be stably modulated using interfacial crystal structures. Here, interactions with MgO stabilize the PZT crystallographic system well and induce the texturing influences, while the PZT film remains quasi-stable on a conventional A1203 wafer. On the basis of this fundamental understanding, a high-output flexible energy harvester is developed using the controlled-PZT system, which shows significantly higher performance than the unmodified PZT generator. The voltage, current, and power densities are improved by 556%, 503%, and 822%, respectively, in comparison with the previous flexional single-crystalline piezoelectric device. Finally, the improved flexible generator is applied to harvest tiny vibrational energy from a real traffic system, and it is used to operate a commercial electronic unit. These results clearly indicate that atomic-scale designs can produce significant impacts on macroscopic applications.

关键词： energy harvesting morphotropic phaseboundary (MPB) piezoelectric first-principles calculation lead zirconium titanate(PZT)

Friction stir welding of 5052 aluminum alloy plates

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中国有色金属学会会刊：英文版 2009年第B9期19卷 23-27页

作者： yong-Jai KWON Seong-beom SHIM Dong-Hwan PARK School of Materials Science and Engineering University of Ulsan Institute of E-Vehicle Technology University of Ulsan

Friction stir welding between 5052 aluminum alloy plates with a thickness of 2 mm was performed. The tool for welding was rotated at speeds ranging from 500 to 3000 r/min under a constant traverse speed of 100 mm/min. The results show that at all tool rotation speeds, defect-free welds are successfully obtained. Especially at 1000, 2000 and 3000 r/min, the welds exhibit very smooth surface morphologies. At 500, 1000, and 2000 r/min, onion ring structure is clearly observed in the friction-stir-welded zone (SZ). In addition, the onion ring structure region becomes wider as the tool rotation speed is increased. The gain size in the SZ is smaller than that in the base metal, and is decreased with a decrease of the tool rotation speed. In all tool rotation speeds, the SZ exhibits higher average hardness than the base metal. Especially at 500 r/min, the average hardness of the SZ reaches a level about 33% greater than that of the base metal. At 500, 1 000 and 2 000 r/min, the tensile strength of the friction stir welded (FSWed) plates is similar to that of the base metal (about 204 MPa). The elongation of the FSWed plates is lower than that of the base metal (about 22%). However, it is noticeable that the maximum elongation of about 21% is obtained at 1 000 r/min.

关键词：搅拌摩擦焊接铝合金板旋转速度焊接工具表面形貌环形结构抗拉强度伸长率

Simultaneous bilateral acromial base fractures after staged reverse total shoulder arthroplasty: A case report

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World Journal of Clinical Cases 2021年第1期9卷 284-290页

作者： Du-Han Kim beom-Soo Kim Chul-Hyun cho Department of Orthopedic Surgery Keimyung University Dongsan HospitalKeimyung University School of MedicineDaegu 42601South Korea

BACKGROUND Acromial and scapular spine fractures after reverse total shoulder arthroplasty(RTSA)are a well-known complication that may negatively impact the effects of long-term ***,to the best of our knowledge,there has been no report of simultaneous bilateral fractures of the acromion or scapular spine that occurred following staged *** SUMMARY A 79-year-old right-handed male visited our outpatient clinic with a chief complaint of pain and limited motion of both shoulder joints for a one-year *** on plain radiographs and magnetic resonance images,the preoperative diagnosis was bilateral cuff tear arthropathy with failed rotator cuff *** patient was treated with staged bilateral RTSA at a two-month *** 5 and 3 mo after right and left side surgery,the patient returned to the outpatient clinic with severe pain and limited motion of both shoulder joints for 2 wk without a traumatic event.A computed tomography scan revealed nondisplaced acromial base fractures of both *** bilateral involvement,fracture location,and patient’s demand,open reduction and internal fixation(ORIF)using plate for bilateral acromial base fractures were *** 2 years after ORIF,the fracture was completely healed,and the patient was satisfied with shoulder *** This report describes an extremely rare case of simultaneous bilateral acromial base fractures after staged RTSA managed successfully by ORIF with a precontoured plate designed for distal clavicle *** acromial fracture after RTSA can be treated conservatively,simultaneous bilateral fractures may warrant surgical intervention as a means of addressing difficulties in activities of daily living.

关键词： Acromion Fracture Arthroplasty Shoulder Reverse total shoulder arthroplasty Case report Complication

Discreteness of Flux Groups

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Acta Mathematica Sinica,English Series 2006年第1期22卷 115-122页

作者： yong Seung cho Myung Im LIM Department of Mathematics Ewha Women's-University Seoul 120-750 Korea

Let （M, ω） be a closed symplectic 2n-dimensional manifold. Donaldson in his paper showed that there exist 2m-dimensional symplectie submanifolds （V^2m,ω） of （M,ω）, 1 ≤m ≤ n - 1, with （m - 1）-equivalent inclusions. On the basis of this fact we obtain isomorphic relations between kernel of Lefschetz map of M and kernels of Lefschetz maps of Donaldson submanifolds V^2m, 2 ≤ m ≤ n - 1. Then, using this relation, we show that the flux group of M is discrete if the action of π1 （M） on π2（M） is trivial and there exists a retraction r ： M→ V, where V is a 4-dimensional Donaldson submanifold. And, in the symplectically aspherical case, we investigate the flux groups of the manifolds.

关键词： Symplectic diffeomorphisms Flux Symplectically aspherical manifold Donaldson submanifold