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World Journal of Gastroenterology 2012年第22期18卷 2877-2880页

作者： Min Joung Kim Byoung Kuk Jang Woo Jin Chung jae seok hwang Young Hwan Kim Department of Gastroenterology Keimyung University School of Medicine Dongsan Medical Center 194 Dongsan-dong Jung-gu Daegu 700-712 South Korea Department of Diagnostic Radiology Keimyung University School of Medicine Dongsan Medical Center 194 Dongsan-dong Jung-gu Daegu 700-712 South Korea

We report a case of duodenal varix bleeding as a long term complication of balloon occluded retrograde transvenous obliteration (BRTO), which was successfully treated with a transjugular intrahepatic portosystemic shunt (TIPS). A 57-year-old man was admitted to the emergency room suffering from melena. He had under-gone BRTO to treat gastric varix bleeding 5 mo before admission. Endoscopy and a computed tomography (CT) scan showed complete obliteration of the gastric varix, but the nodular varices in the second portion of the duodenum expanded after BRTO, and spurting blood was seen. TIPS was performed for treatment of duodenal variceal bleeding, because attempts at endoscopic varix ligation were unsuccessful. The post-operative course was uneventful and the patient was discharged without complications. A follow up CT scan obtained 21 mo after TIPS revealed a patent TIPS tract and complete obliteration of duodenal varices, but multinodular hepatocellular carcinoma had developed. He died of hepatic failure 28 mo after TIPS.

关键词： Duodenal variceal bleeding Balloon occlud-ed retrograde transvenous obliteration Transjugularintrahepatic portosystemic shunt

Hemorrhagic hemangioma in the liver:A case report

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World Journal of Gastroenterology 2015年第23期21卷 7326-7330页

作者： Jeong Min Kim Woo Jin Chung Byoung Kuk Jang jae seok hwang Yong Hoon Kim Jung Hyeok Kwon Mi Sun Choi Department of Internal Medicine Keimyung University School of Medicine Department of Hepatobiliary Surgery Keimyung University School of Medicine Department of Radiology Keimyung University School of Medicine Department of Pathology Keimyung University School of Medicine

Hemangioma is the most common type of benign tumor that arises in the liver. Although rupture and hemorrhage of hepatic hemangioma are rare complications, they can be the cause of mortality. The authors report a case of hemorrhagic hepatic hemangioma: in a 54-yearold woman who was admitted with epigastric *** had taken oral contraceptives several weeks *** results of a blood examination were normal. An abdominal computed tomography scan revealed a tumor in hepatic segment 4, and a hemorrhage inside the cystic mass was suspected. The mass was removed laparoscopically to confirm the tumor properties and control the hemorrhage. The pathologic findings of the resected mass were consistent with hepatic hemangioma with intratumoral hemorrhage. The patient was discharged 8 d after the surgery, without further complications or complaints, and the patient's condition was found to have improved during follow-up.

关键词： Hemangioma Liver Hemorrhage Tumor Complication

Negative impact of sedation on esophagogastric junction evaluation during esophagogastroduodenoscopy

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World Journal of Gastroenterology 2014年第18期20卷 5527-5532页

作者： Eun Soo Kim Ho Young Lee Yoo Jin Lee Bo Ram Min jae Hyuk Choi Kyung Sik Park Kwang Bum Cho Byoung Kuk Jang Woo Jin Chung jae seok hwang Division of Gastroenterology and Hepatology Department of Internal MedicineKeimyung University School of MedicineDaegu 700-712South Korea

AIM: To compare the esophagogastric junction (EGJ) areas observed in sedated and non-sedated patients during esophagogastroduodenoscopy (EGD).

关键词： Esophagogastric junction Endoscopy Esophagus Propofol Midazolam

Comparison of a novel bedside portable endoscopy device with nasogastric aspiration for identifying upper gastrointestinal bleeding

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World Journal of Gastroenterology 2014年第25期20卷 8221-8228页

作者： Jong Hwan Choi jae Hyuk Choi Yoo Jin Lee Hyung Ki Lee Wang Yong Choi Eun Soo Kim Kyung Sik Park Kwang Bum Cho Byoung Kuk Jang Woo Jin Chung jae seok hwang Division of Gastroenterology and Hepatology Department of Internal Medicine Keimyung University School of MedicineDaegu 700-712South Korea

AIM: To compare outcomes using the novel portable endoscopy with that of nasogastric (NG) aspiration in patients with gastrointestinal bleeding.

关键词： Endoscopy Gastrointestinal bleeding Nasogastric aspiration

Risk factors for local recurrence after en bloc endoscopic submucosal dissection for early gastric cancer

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World Journal of Gastrointestinal Endoscopy 2016年第7期8卷 330-337页

作者： Ju Yup Lee Kwang Bum Cho Eun Soo Kim Kyung Sik Park Yoo Jin Lee Yoon Suk Lee Byoung Kuk Jang Woo Jin Chung jae seok hwang Department of Internal Medicine Keimyung University School of Medicine

AIM: To investigate factors related to recurrence following en bloc resection using endoscopic submucosal dissection(ESD) in patients with early gastric cancer(EGC). METHODS: A total of 1121 patients(1215 lesions) who had undergone ESD for gastric neoplasia between April 2003 and May 2010 were retrospectively reviewed. Data from 401 patients(415 lesions) were analyzed, following the exclusion of those who underwent piecemeal resection, with deep resection margin invasion or lateral margin infiltration, and diagnosed with benign lesions. RESULTS: Local recurrence after en bloc ESD was found in 36 cases(8.7%). Unclear resection margins, long procedure times, and narrow safety margins were identified as risk factors for recurrence. Lesions located in the upper third of the stomach showed a higher rate of recurrence than those located in the lower third of the stomach(OR = 2.9, P = 0.03). The probability of no recurrence for up to 24 mo was 79.9% in those with a safety resection margin ≤ 1 mm and 89.5% in those with a margin > 1 mm(log-rank test, P = 0.03). CONCLUSION: Even in cases in which en bloc ESD is performed for EGC, local recurrence still occurs. To reduce local recurrences, more careful assessment will be needed prior to the implementation of ESD in casesin which the tumor is located in the upper third of the stomach. In addition, clear identification of tumor boundaries as well as the securing of sufficient safety resection margins will be important.

关键词： Early gastric cancer Endoscopic mucosal resection Recurrence En bloc resection Endoscopic submucosal dissection

Geometric-phase intraocular lenses with multifocality

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Light(Science & Applications) 2022年第11期11卷 2805-2816页

作者： Seungmin Lee Gayeon Park Senho Kim Yeonghwa Ryu jae Woong Yoon Ho Sk hwang In seok Song Chang Sun Lee seok Ho Song Department of Physics Hanyang UniversitySeoul 04763Republic of Korea Department of Ophthalmology Catholic University of KoreaSeoul 07345Republic of Korea Seoul Ophthalmic Clinic Goyang 10463Republic of Korea Koryoeyetech In.Seoul 06093Republic of Korea Tigernics IncSeoul 04763Republic of Korea

We demonstrate a new type of multifocal and extended depth of focus(EDOF)intraocular lenses(IOLs)embeddingμm-thin geometric phase(GP)lens *** an emerging approach for lens phase design,the GP modulated IOLs outperform conventional diffractive IOLs in multifocality while completely avoiding the clinically undesirable demand for additional surface patterns to standard monofocal IOL *** number of foci and light splitting ratio of the GP IOLs are adjusted by changing the number of stacked GP layers and the thickness of each *** and trifocal GP IOLs are fabricated by radial alignment of anisotropic orientation in UV-curable liquid crystal *** characterizing the defocus image and modulation transfer function of the GP IOLs,it is expected that GP IOLs will alleviate the most common problems associated with multifocal and EDOF IOLs,blurred vision and photic phenomena caused by light scattering and posterior capsule opacification.

关键词： layer phase alignment

Adaptive Electrospinning System Based on Reinforcement Learning for Uniform‑Thickness Nanofiber Air Filters

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Advanced Fiber Materials 2023年第2期5卷 617-631页

作者： seok Hyeon hwang Jin Yeong Song Hyun Il Ryu jae Hee Oh Seungwook Lee Donggeun Lee Dong Yong Park Sang Min Park School of Mechanical Engineering Pusan National University63‑2 Busan University‑roGeumjeong‑guBusan 46241South Korea Smart Manufacturing Technology R&D Group Korea Institute of Industrial Technology320 Techno Sunhwan‑roYuga‑eupDalseong‑gunDaegu 42994Republic of Korea

Electrospinning is a simple and versatile method to produce nanofiber ***,owing to bending instability that occurs during the electrospinning process,electrospinning has frequently produced a non-uniform-thickness nanofiber filter,which deteriorates its air ***,an adaptive electrospinning system based on reinforcement learning(E-RL)was developed to produce uniform-thickness nanofiber *** E-RL accomplished a real-time thickness measurement of an electrospun nanofiber filter by measuring the transmitted light through the nanofiber filter using a camera placed at the bottom of the collector and converting it into thickness using the Beer–Lambert *** on the measured thickness,the E-RL detected the non-uniformity of the nanofiber filter thickness and manipulated the movable collector to alleviate the non-uniformity of the thickness by a pre-trained reinforcement learning(RL)*** the training of the RL algo-rithm,the nanofiber production simulation software based on the empirical model of the deposition of the nanofiber filter was developed,and the training process of the RL algorithm was repeated until the optimal policy was *** the training process with the simulation software,the trained model was transferred to the adaptive electrospinning *** the movement of the collector under the optimal strategy of RL algorithm,the non-uniformity of such nanofiber filters was significantly reduced by approximately five times in standard deviation and error for both simulation and *** finding has great potential in improving the reliability of electrospinning process and nanofiber filters used in research and industrial fields such as environment,energy,and biomedicine.

关键词： Electrospinning Nanofiber filter Uniform thickness Reinforcement learning Deep Q-network

In situ total strain measurements revealing the strain mechanism of Pb(Mg_(1/3)Nb_(2/3))O_(3)ePbTiO_(3) single crystals

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Journal of Materiomics 2021年第4期7卷 693-698页

作者： hwang-Pill Kim Geon-Ju Lee jae-Hyeon Cho Woo-seok Kang Sang-Goo Lee Ho-Yong Lee Wook Jo School of Materials Science and Engineering&Jülich-UNIST Joint Leading Institute for Advanced Energy Research Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea IBULe Photonics Inc.7-39Songdo-dongYeonsu-guIncheon21999Republic of Korea Department of Materials Science and Engineering Sun Moon UniversityAsan31460Republic of Korea

The strain behavior of 0.71 Pb(Mg_(1/3)Nb_(2/3))O_(3)ePbTiO_(3)(PMN-PT)single crystal prepared by a solidstate single crystal growth method was investigated on two most widely used orientations,i.e.,(001)-and(011)-oriented.A special emphasis was put on the correlation among longitudinal and transverse strains and the consequent volume *** show that seemingly different strain behavior of(001)-and(011)-oriented crystals has the same origin,and the underlying mechanism excludes possible contribution from the frequently cited polarization *** situ monitoring of electric field induced Poisson’s ratio further suggested that the polarization vectors contributing to the strain properties in PMN-PT are not confined to a unique direction forced by the crystallographic symmetry but possess a span of angular range.

关键词： Piezoelectricity Single crystal PMN-PT Radial strain Poisson’s ratio

W-translated Schubert divisors and transversal intersections

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Science China Mathematics 2022年第10期65卷 1997-2018页

作者： DongSeon hwang Hwayoung Lee jae-Hyouk Lee Changzheng Li Department of Mathematics Ajou UniversitySuwon 443-749Republic of Korea Department of Mathematics University of CaliforniaRiversideRiversideCA 92521USA Department of Mathematics Ewha Womans UniversitySeoul 120-750Republic of Korea School of Mathematics Sun Yat-sen UniversityGuangzhou 510275China

We study the toric degeneration of Weyl group translated Schubert divisors of a partial flag variety F?_(n1,...,nk;n) via Gelfand-Cetlin polytopes. We propose a conjecture that Schubert varieties of appropriate dimensions intersect transversally up to translation by Weyl group elements, and verify it in various cases,including the complex Grassmannian Gr(2, n) and the complete flag variety F?_(1,2,3;4).

关键词： W-translated Schubert varieties transversal intersection Gelfand-Cetlin polytope toric degeneration flag varieties

Numerical evaluation of buckling behavior in space structure considering geometrical parameters with joint rigidity

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Journal of Central South University 2014年第3期21卷 1115-1124页

作者： Su-Deok Shon Kyung-Ju hwang Seung-jae Lee School of Architectural Engineering Korea University of Technology and Education School of Architecture University of Seoul

The buckling behavior of single layer space structure is very sensitive. The joint rigidity, moreover, is one of the main factors of stability which may determine the entire failure behavior. Thus, the reasonable stiffness of joint system, which is neither total pin assumption nor perfect fix condition, is very important to apply to the real single layer space one. Therefore, the purpose of this work was to investigate the buckling behavior of single layer space structure, using the development of the upgraded stiffness matrix for the joint rigidity. To derive tangential stiffness matrix, a displacement function was assumed using translational and rotational displacement at the node. The geometrical nonlinear analysis was simulated not only with perfect model but also with imperfect one. As a result, the one and two free nodal numerical models were investigated using derived stiffness matrix. It was figured out that the buckling load increases in proportion to joint rigidity with rise-span ratio. The stability of numerical model is very sensitive with the initial imperfection, responding of bifurcation in the structure.

关键词： space frame geometric nonlinearity snap-through bifurcation initial imperfection joint rigidity