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Unilateral versus bilateral Y-type stent-in-stent metal stent insertions in inoperable malignant hilar biliary strictures:A multicenter retrospective study

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Hepatobiliary & Pancreatic Diseases International 2021年第6期20卷 561-567页

作者： Ik Hyun Jo chang-nyol paik Dae Bum Kim Jaesin Lee Jong Yul Lee Jae Hyuck chang Kyu-Hyun paik Won-Suk Park Department of Internal Medicine College of MedicineSt.Vincent’s HospitalThe Catholic University of KoreaSeoulKorea Department of Internal Medicine College of MedicineIncheon St.Mary’s HospitalThe Catholic University of KoreaSeoulKorea Department of Internal Medicine College of MedicineBucheon St.Mary’s HospitalThe Catholic University of KoreaSeoulKorea Department of Internal Medicine College of MedicineDaejeon St.Mary’s HospitalThe Catholic University of KoreaSeoulKorea

Background:To date,there is controversy regarding unilateral versus bilateral stent placement in patients with malignant hilar biliary strictures(MHBSs).The aim of this study was to compare the clinical outcomes and complications of unilateral and bilateral(stent-in-stent method)stent placements for these ***:We conducted a multicenter retrospective analysis of patients with inoperable MHBS who underwent endoscopic self-expandable metal stent(SEMS)placement from January 2009 to December *** groups classified according to the stent procedure method were compared for demographic,procedural,and postprocedure *** analysis for patency loss and overall survival was also ***:A total of 236 subjects were included.A superior technical success rate was found in the unilateral stent group(98.8%vs.82.5%,P<0.001),whereas the clinical success rate was higher in the bilateral group(85.7%vs.70.5%,P=0.028).There was no significant difference with respect to complications or patency loss,and the bilateral group had better overall survival(P<0.01).In the Cox proportional hazard model,MHBSs from lymph node compression were associated with a higher risk of death(HR=9.803,P=0.003).In contrast,bilateral SEMS insertion showed reduced postprocedural mortality(HR=0.316,P=0.001).Conclusions:Y-type stent-in-stent bilateral SEMSs are technically difficult but demonstrated more favorable overall survival for palliative bile drainage of inoperable MHBS patients compared to unilateral insertions.

关键词： Cholestasis Extrahepatic neoplasm Cholangiopancreatography Endoscopy Self-expandable metal stents

Evaluation of non-ampullary duodenal polyps: Comparison of non-neoplastic and neoplastic lesions

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World Journal of Gastroenterology 2010年第43期16卷 5474-5480页

作者： Sung Hoon Jung Woo Chul Chung Eun Jung Kim Seol Hye Kim chang nyol paik Bo In Lee Young Seok Cho Kang-Moon Lee Department of Internal Medicine College of Medicine The Catholic University of Korea

AIM: To evaluate duodenal polyps, divided into nonneoplastic and neoplastic lesions. In addition, the clinical characteristics of duodenal hyperplastic polyps are determined. METHODS: We analyzed medical records of 50 114 consecutive patients submitted to for first diagnostic esophago-gastroduodenoscopy between January 2004 and December 2009. We excluded lesions on the ampulla of Vater and submucosal tumors. We studied 510 cases that were diagnosed endoscopically with duodenal polyps and enrolled a total of 221 cases that had undergone tissue biopsy. We analyzed the differences between non-neoplastic and neoplastic lesions, and determined the clinical features of duodenal hyperplastic polyps. RESULTS: Non-neoplastic lesions were found in 196 patients and neoplastic lesions in 25 patients. On uni-variate analysis, there were significant differences in shape, location, and size. Polyps more than 10 mm in diameter or polyps in the second portion had independent risk factors for being neoplastic lesions, as identified by multivariate analysis. In 23 cases of hyperplastic polyps (79.3%), they were accompanied by gastroduodenal pathology, which was possibly associated with Helicobacter pylori . CONCLUSION: Polyps of more than 10 mm or polyps in the second portion of the duodenum should be evaluated by histological examination.

关键词： Duodenum Polyp Helicobacter pylori

Spontaneous resolution of multiple lymphangiomas of the colon:A case report

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World Journal of Gastroenterology 2011年第11期17卷 1515-1518页

作者： Ji Min Lee Woo Chul Chung Kang-Moon Lee chang nyol paik Yeon-Ji Kim Bo-In Lee Young Seok Cho Hyun Joo Choi Department of Internal Medicine College of Medicine the Catholic University of KoreaSt.Vincent's Hospital 93-6Ji dongPaldal-guSuwonGyeonggi-do442-723South Korea

Lymphangioma of the colon is a relatively rare nonepithelial tumor and usually presents as a submucosal polypoid *** cases incidentally discovered are usually ***,they may present as abdominal pain or bleeding,and their resection is normally *** itself is generally recognized as a benign tumor and no cases of malignant transformation have yet been reported,although its natural history is currently *** the best of our knowledge,this study is the first to describe a case of spontaneous resolution in multiple colonic lymphangiomas without any specific treatment.

关键词：淋巴管瘤病例报告结肠良性肿瘤膜下腹痛

InIncidence and clinical features of endoscopic ulcers developing after gastrectomy

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World Journal of Gastroenterology 2012年第25期18卷 3260-3266页

作者： Woo Chul Chung Eun Jung Jeon Kang-Moon Lee chang nyol paik Sung Hoon Jung Jung Hwan Oh Ji Hyun Kim Kyong-Hwa Jun Hyung Min Chin Department of Internal Medicine The Catholic University of KoreaSeoul 130-709South Korea Department of Surgery The Catholic University of Korea College of MedicineSeoul 130-709South Korea

AIM:To determine the precise incidence and clinical features of endoscopic ulcers following ***:A consecutive series of patients who underwent endoscopic examination following gastrectomy between 2005 and 2010 was retrospectively analyzed.A total of 78 patients with endoscopic ulcers and 759 without ulcers following gastrectomy were *** analyzed differences in patient age,sex,size of the lesions,method of operation,indications for gastric resection,and infection rates of Helicobacter pylori(***) between the nonulcer and ulcer ***:The incidence of endoscopic ulcers after gastrectomy was 9.3% and that of marginal ulcers was 8.6%.Ulcers were more common in patients with Billroth Ⅱ anastomosis and pre-existing conditions forpeptic ulcer disease(PUD).Infection rates of *** not differ significantly between the two *** patients who underwent operations to treat PUD had lower initial levels of hemoglobin and higher rates of hospital ***:*** was not an important factor in ulcerogenesis following *** patients who underwent surgery for PUD,clinical course of marginal ulcers was more severe.

关键词：溃疡性临床特点切除术发病率内镜胃幽门螺旋杆菌手术治疗

Machine-Learning Based Packet Switching Method for Providing Stable High-Quality Video Streaming in Multi-Stream Transmission

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Computers, Materials & Continua 2024年第3期78卷 4153-4176页

作者： Yumin Jo Jongho paik Major in Software Fusion Department of ComputerSeoulWomen’s UniversitySeoul01797South Korea Department of Software Convergence Seoul Women’s UniversitySeoul01797South Korea

Broadcasting gateway equipment generally uses a method of simply switching to a spare input stream when a failure occurs in a main input ***,when the transmission environment is unstable,problems such as reduction in the lifespan of equipment due to frequent switching and interruption,delay,and stoppage of services may ***,applying a machine learning(ML)method,which is possible to automatically judge and classify network-related service anomaly,and switch multi-input signals without dropping or changing signals by predicting or quickly determining the time of error occurrence for smooth stream switching when there are problems such as transmission errors,is *** this paper,we propose an intelligent packet switching method based on the ML method of classification,which is one of the supervised learning methods,that presents the risk level of abnormal multi-stream occurring in broadcasting gateway equipment based on ***,we subdivide the risk levels obtained from classification techniques into probabilities and then derive vectorized representative values for each attribute value of the collected input data and continuously update *** obtained reference vector value is used for switching judgment through the cosine similarity value between input data obtained when a dangerous situation *** the broadcasting gateway equipment to which the proposed method is applied,it is possible to perform more stable and smarter switching than before by solving problems of reliability and broadcasting accidents of the equipment and can maintain stable video streaming as well.

关键词： Broadcasting and communication convergence multi-stream packet switching advanced television systems committee standard 3.0(ATSC 3.0) data pre-processing machine learning cosine similarity

Ischemic colitis associated with intestinal vasculitis: Histological proof in systemic lupus erythematosus

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World Journal of Gastroenterology 2008年第22期14卷 3591-3593页

作者： Jeong Rok Lee chang nyol paik Jin Dong Kim Woo Chul Chung Kang-Moon Lee Department of Internal Medicine College of Medicine The Catholic University of Korea St. Vincent's Hospital Suwon Si Paldal-gu Gyeonggi-Do 442-723 South Korea

I schemic colitis is an uncommon complication in patients with systemic lupus erythematosus (SLE). In previously reported cases of colitis caused by SLE, intestinal vasculitis is implicated as the causative process, but is rarely confirmed histologically. We described a case of a 32-year-old man with increased activity of SLE, who presented with hematochezia and abdominal pain due to ischemic colitis with small vessel vasculitis which was proven by sigmoidoscopic biopsy. The clinical course of the patient was improved after steroid and conservative management.

关键词：大肠炎血管炎组织学狼疮

In-situ isothermal aging TEM analysis of a micro Cu/ENIG/Sn solder joint for flexible interconnects

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Journal of Materials Science & Technology 2024年第2期169卷 42-52页

作者： Jinhong Liu Jianhao Xu Kyung-Wook paik Peng He Shuye Zhang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China Department of materials science and engineering KAIST291 Daehak-roYuseong-guDaejeon305-338Republic of Korea

Sn/ENIG has recently been used in flexible interconnects to form a more stable micron-sized metallurgical joint,due to high power capability which causes solder joints to heat up to 200℃.However,Cu_(6)Sn_(5)which is critical for a microelectronic interconnection,will go through a phase transition at temperatures between 186 and 189℃.This research conducted an in-situ TEM study of a micro Cu/ENIG/Sn solder joint under isothermal aging test and proposed a model to illustrate the mechanism of the microstructural *** results showed that part of the Sn solder reacted with Cu diffused from the electrode to formη´-Cu_(6)Sn_(5)during the ultrasonic bonding process,while the rest of Sn was left and enriched in a region in the solder *** the enriched Sn quickly diffused to both sides when the temperature reached 100℃,reacting with the ENIG coating and Cu to form(Ni_(x)Cu_(1-x))_(3)Sn_(4),AuSn_(4),and Cu_(6)Sn_(5)*** entering the heat preservation process,the diffusion of Cu from the electrode to the joint became more intense,resulting in the formation of Cu_(3)*** scallop-type Cu_(6)Sn_(5)and the seahorse-type Cu_(3)Sn constituted a typical two-layered structure in the solder *** importantly,the transition betweenηandη’was captured near the phase transition temperature for Cu_(6)Sn_(5)during both the heating and cooling process,which was accompanied by a volume shifting,and the transition process was further *** research is expected to serve as a reference for the service of micro Cu/ENIG/Sn solder joints in the electronic industry.

关键词： In-situ TEM observation Isothermal aging Micro Cu/ENIG/Sn solder joint Cu_(6)Sn_(5)phase transition

Ischemic colitis due to obstruction of mesenteric and splenic veins: A case report

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World Journal of Gastroenterology 2008年第14期14卷 2272-2276页

作者： Seong-Su Hwang Woo-Chul Chung Kang-Moon Lee Hyun-Jin Kim chang-nyol paik Jin-Mo Yang Department of Radiology St. Vincent Hospital the Catholic University Suwon-si Gyeonggi-do 442-723 Korea Department of Internal Medicine St. Vincent Hospital the Catholic University Suwon-si Gyeonggi-do 442-723 Korea

Ischemic injury to the bowel is a well known disease entity that has a wide spectrum of pathological and clinical findings. A sudden drop in the colonic blood supply is essential to its development. We encountered a 41-year-old male patient, who presented with abdominal pain and bloody diarrhea. A colonoscopy showed markedly edematous mucosa with tortuous dilatation of the veins and a deep ulceration at the rectosigmoid junction. On an abdominal computed tomography (CT) scan and CT angiography, the mesenteric and splenic veins were absent with numerous venous collaterals for drainage. The patient gradually responded to oral aminosalicylate therapy, and was in remission after nine months. In most cases, non-occlusive ischemic injury is caused by idiopathic form and occlusive ischemia is caused by abnormalities of arteries and acute venous thrombosis. However, chronic venous insufficiency due to obstruction of macrovascular mesenteric vein rarely causes ischemia of the bowel. This report describes the first case of ischemic colitis caused by obstruction of the mesenteric and splenic veins.

关键词：缺血性大肠炎肠系膜静脉治疗方法病例报告

Colonic lymphangiomatosis associated with anemia

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World Journal of Gastroenterology 2008年第37期14卷 5760-5762页

作者： Woo Chul Chung Hye-Kang Kim Jin Young Yoo Jeong Rok Lee Kang-Moon Lee chang nyol paik U-Im Jang Jin Mo Yang Department of Internal Medicine College of Medicine the Catholic University of KoreaSeoul 137-701 South Korea Department of Pathology College of Medicine the Catholic University of KoreaSeoul 137-701 South Korea

Lymphangioma is an uncommon malformation of lymphatic system. Multiple colonic lymphangioma named as lymphangiomatosis is considered an extremely rare disease. Although lymphangioma is a benign tumor and most colonic lymphangiomas do not cause symptoms and do not require treatment, resection of lymphangioma is necessary in the presence of symptoms such as abdominal pain, bleeding, intussusceptions. We report a case of colonic lymphangiomatosis in a man who presented with abdominal discomfort and anemia, which was diagnosed and treated with endoscopic snare polypectomy.

关键词：淋巴管瘤贫血息肉切除术淋巴系统