检索结果-南通市图书馆

Duodenal obstruction after successful embolization for duodenal diverticular hemorrhage: A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第30期15卷 3819-3822页

作者： Yu jin Kwon Ji Hun kim Seung Hyoung kim Bong soo kim Heung Up kim Eun Kwang Choi In Ho Jeong Department of Surgery Seoul National University College of Medicine28 Yeongeon-dongSeoul 110-744South Korea Department of Surgery Ajou University School of MedicineSan-5WonchondongYeongtongguSuwon 442-749South Korea Department of radiology Jeju National University School of Medicine1753-3Ara 1-DongJeju 690-121South Korea Department of internal medicine Jeju National University School of Medicine1753-3Ara 1-DongJeju 690-121South Korea Department of surgery Jeju National University School of Medicine1753-3Ara 1-DongJeju 690-121South Korea

We present a 69-year-old woman with a duodenal obstruction after successful selective transcatheter arterial embolization (TAE) for a duodenal diverticular hemorrhage. Two weeks after TAE, the patient showed abrupt symptoms of duodenal obstruction. Resolving hematomas after successful selective transcatheter arterial embolization should be thoroughly observed because they might result in duodenal fibrotic encasement featuring inflammatory duodenal wall thickening, duodenal deformity, dysmotility, and fi nally obstruction.

关键词： Diverticulum Gastrointestinal hemorrhage Therapeutic embolization Duodenal obstruction

Stud welding for fixation of cryogenic insulation of membrane tanks in LNG ship building

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2009年第B9期19卷 271-275页

作者： Jeong-soo LEE Young-soo RYU Nam-In kim Bong-Joon kim Yoo-Kyung kim Myung-Hyun kim Hanjin Heavy Industries & Construction Co. Ltd Department of Naval Architecture and Ocean Engineering Pusan National University

The support plates including all of the inner hulls such as E grade steel, weld seams and SUS304L were considered to establish the optimal stud welding condition in LNG ship building. The stainless steel plate was especially applied to the bracket on the liquid dome. The polished and etched surfaces of the welded stud and support plate were examined if the bead was properly formed. With the micrographic examination, the fusion boundary of metal weld zone formed by stud welding was analyzed to optimize the welding parameters. And also the analysis of the unacceptable welding faults such as cold and hot weld were performed. The mechanical tests such as tensile tests and bending tests were carried out to reveal any abnormal variation in the relationship of process parameters and the strength.

关键词：螺柱焊接 LNG船绝缘膜优化工艺参数低温坦克不锈钢板最佳条件

Expression of Ki-67,p53,and K-ras in chronic pancreatitis and pancreatic ductal adenocarcinoma

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第43期11卷 6765-6769页

作者： Seok Jeong Don Haeng Lee Jung Il Lee jin-Woo Lee Kye sook Kwon Pum-soo kim Hyung Gil kim Yong Woon Shin Young soo kim Young Bae kim Division of Gastroenterology Department of Pathology

AIM： To examine surgical specimens of pancreas with either chronic pancreatitis or pancreatic cancer in order to study whether ductal hyperplasia and dysplasia in pancreas represent precursor lesions for pancreatic cancer. METHODS： We examined expression of Ki-67, CEA, p53, and K-ras, in the surgical specimens of pancreas with adenocarcinomas （n = 11） and chronic pancreatitis （n = 12）. Cellular proliferation was assessed by Ki-67 proliferation index using the proliferation marker Ki-67. In specimens with pancreas cancer, we divided pancreas epithelium into normal （n = 7）, ductal hyperplasia （n = 3）, dysplasia （n = 4）, and cancerous lesion （n = 11） after hematoxylin and eosin staining, Ki-67, and CEA immunohistochemical staining. In cases with chronic pancreatitis, the specimen was pathologically examined as in cases with pancreas cancer, and they were also determined as normal （n = 10）, ductal hyperplasia （n = 4）, or dysplasia （n = 5）. p53 and K-ras expression were also studied by immunohistochemical staining. RESULTS： In pancreatic cancer, the Ki-67 index was 3.73±3.58 in normal site, 6.62±4.39 in ductal hyperplasia, 13.47：1：4.02 in dysplasia and 37.03±10.05 in cancer tissue, respectively. Overall, p53 was positive in normal ducts, ductal hyperplasia, dysplasia, and carcinoma cells in 0 of 14 （0%）, 0 of 7 （0%）, 7 of 9 （78%）, and 10 of 11 （91%）, respectively, and K-ras was positive in 0 of 8 （0%）, 1 of 3 （33%）, 4 of 6 （67%）, 4 of 5 （80%）, respectively. CONCLUSION： Our results favorably support the hypothesis that ductal hyperplasia and dysplasia of the pancreas might be precursor lesions for pancreas cancer. Further evaluation of oncogenes by the molecular study is needed.

关键词： Ki-67 p53 K-ras Chronic pancreatitis Pancreatic ductal adenocarcinoma

A New FIR Filter for State Estimation and Its Application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2007年第5期22卷 779-784页

作者： Pyung-soo kim Myung-Eui Lee Department of Electronics Engineering Korea Polytechnic University Shiheung CityKgunggi-DoKorea School of Information Technology Korea University of Technology and Education Cheonan City Chungnam-DoKorea

This paper proposes a new FIR （finite impulse response） filter under a least squares criterion using a forgetting factor. The proposed FIR filter does not require information of the noise covariances as well as the initial state, and has some inherent properties such as time-invariance, unbiasedness and deadbeat. The proposed FIR filter is represented in a batch form and then a recursive form as an alternative form. Prom discussions about the choice of a forgetting factor and a window length, it is shown that they can be considered as useful parameters to make the estimation performance of the proposed FIR filter as good as possible. It is shown that the proposed FIR filter can outperform the existing FIR filter with incorrect noise covariances via computer simulations. Finally, as a useful application, an image sequence stabilization problem is considered. Through this application, the FIR filtering based approach is shown to be superior to the Kalman filtering based approach.

关键词： state estimation FIR (finite impulse response) filter Kalman filter least squares forgetting factor

Biomass-derived bifunctional electrocatalysts for oxygen reduction and evolution reaction: A review

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第2期31卷 149-172页

作者： Satpal Singh Sekhon Jaeyoung Lee jin-soo Park Future Environment and Energy Research Institute Sangmyung UniversityCheonan 31066Republic of Korea Department of Physics Guru Nanak Dev UniversityAmritsar 143005India Ertl Center for Electrochemistry and Catalysis Gwangju Institute of Science and Technology123 Cheomdangwagi-roBuk-guGwangju 61005Republic of Korea Department of Green Chemical Engineering College of EngineeringSangmyung UniversityCheonan 31066Republic of Korea

Oxygen electrode catalysts are important as inter-conversion of O_(2) and H_(2)O is crucial for energy ***,the sluggish kinetics of oxygen reduction and evolution reactions(ORR and OER)are a hindrance to their scalable production,whereas scarce and costly Pt and Ir/Ru-based catalysts with the highest electrocatalytic activity are commercially *** good ORR catalysts are not always efficient for OER and vice versa,so bifunctional catalysts on which OER and ORR occurs on the same electrode are very *** catalysts based on heteroatom-doped carbon nanomaterials,though showed good electrocatalytic activity yet their high cost and complex synthesis is not viable for scalable *** overcome these drawbacks,biomass-derived heteroatom-doped porous carbons have recently emerged as low-cost,earth-abundant,renewable and sustainable environment-friendly materials for bifunctional oxygen *** tunable morphology,mesoporous structure and high concentration of catalytic active sites of these materials due to heteroatom(N)-doping could further enhance their ORR and OER activity,along with tolerance to methanol crossover and good ***,biomassderived heteroatom-doped porous carbons with large surface area,rich edge defects,numerous micropores and thin 2 D nanoarchitecture could be suitable as efficient bifunctional oxygen *** the present article,synthesis,N-doping,ORR/OER mechanism and electrocatalytic performance of biomassderived bifunctional catalysts has been *** selected biomass(chitin,eggs,euonymus japonicas,tobacco,lysine and plant residue)except wood,act as both C and N precursor,resulting in N selfdoping of porous carbons that avoids the use of toxic chemicals,thus making the synthesis a facile and environment-friendly green *** synthetic strategy could be further optimized to develop future biomass-based N self-doped porous carbons as metal-free high performance bifunctional oxy

关键词： Bifunctional catalysts Biomass ORR OER N-doping Porous carbons

Microfluidic dual loops reactor for conducting a multistep reaction

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2018年第2期12卷 239-246页

作者： Si Hyung jin Jae-Hoon Jung Seong-Geun Jeong Jongmin kim Tae Jung Park Chang-soo Lee Department of Chemical Engineering Chungnam National University Daejeon 34134 Korea Lotte Chemical R&D Center Daejeon 34110 Korea Department of Chemistry Chung-Ang University Seoul 06974 Korea

Precise control of each individual reaction that constitutes a multistep reaction must be performed to obtain the desired reaction product efficiently. In this work, we present a microfluidic dual loops reactor that enables multistep reaction by integrating two identical loop reactors. Specifically, reactants A and B are synthesized in the first loop reactor and transferred to the second loop reactor to synthesize with reactant C to form the final product. These individual reactions have nano-liter volumes and are carded out in a stepwise manner in each reactor without any cross-contamination issue. To pre- cisely control the mixing efficiency in each loop reactor, we investigate the operating pressure and the operating frequency on the mixing valves for rotary mixing. This microfluidic dual loops reactor is integrated with several valves to realize the fully automated unit operation of a multistep reaction, such as metering the reactants, rotary mixing, transportation, and collecting the product. For proof of concept, CdSeZn nanopartieles are successfully synthesized in a microfluidic dual loops reactor through a fully automated mukistep reaction. Taking all of these features together, this microfluidic dual loops reactor is a general microfluidic screening platform that can synthesize various materials through a multistep reaction.

关键词： microfluidics multistep reaction rotary mixing nanoparticle

Generation of mesenchymal stem-like cells for producing extracellular vesicles

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Stem Cells 2019年第5期11卷 270-280页

作者： soo kim Tae Min kim Brexogen Research Center Brexogen Inc. Seoul Songpa-gu 05718 South Korea Graduate School of International Agricultural Technology and Institute of Green- Bio Science and Technology Seoul National University Gangwon-do Pyeongchang 25354 South Korea

Mesenchymal stem cells (MSCs) are multipotent progenitor cells with therapeutic potential against autoimmune diseases, inflammation, ischemia, and metabolic disorders. Contrary to the previous conceptions, recent studies have revealed that the tissue repair and immunomodulatory functions of MSCs are largely attributed to their secretome, rather than their potential to differentiate into desired cell types. The composition of MSC secretome encompasses cytokines and growth factors, in addition to the cell-derived structures known as extracellular vesicles (EVs). EVs are membrane-enclosed nanoparticles that are capable of delivering biomolecules, and it is now believed that MSC-derived EVs are the major players that induce biological changes in the target tissues. Based on these EVs’ characteristics, the potential of EVs derived from MSC (MSC-EV) in terms of tissue regeneration and immune modulation has grown during the last decade. However, the use of MSCs for producing sufficient amount of EVs has not been satisfactory due to limitations in the cell growth and large variations among the donor cell types. In this regard, pluripotent stem cells (PSCs)-derived MSC-like cells, which can be robustly induced and expanded in vitro, have emerged as more accessible cell source that can overcome current limitations of using MSCs for EV production. In this review, we have highlighted the methods of generating MSC-like cells from PSCs and their therapeutic outcome in preclinical studies. Finally, we have also discussed future requirements for making this cell-free therapy clinically feasible.

关键词： Mesenchymal stem cells Extracellular vesicles Preclinical studies Exosomes

Benzydamine inhibits osteoclast differentiation and bone resorption via down-regulation of interleukin-1β expression

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2020年第3期10卷 462-474页

作者： Han Saem Son Jiae Lee Hye In Lee Narae kim You-jin Jo Gong-Rak Lee Seong-Eun Hong Minjeong Kwon Nam Young kim Hyun jin kim jin Ha Park soo Young Lee Woojin Jeong Department of Life Science and the Research Center for Cellular Homeostasis Ewha Womans UniversitySeoul 03760South Korea

Bone diseases such as osteoporosis and periodontitis are induced by excessive osteoclastic activity,which is closely associated with ***(BA)has been used as a cytokine-suppressive or non-steroidal anti-inflammatory drug that inhibits the production of proinflammatory cytokines or ***,its role in osteoclast differentiation and function remains ***,we explored the role of BA in regulating osteoclast differentiation and elucidated the underlying *** inhibited osteoclast differentiation and strongly suppressed interleukin-1β(IL-1β)*** inhibited osteoclast formation and bone resorption when added to bone marrowderived macrophages and differentiated osteoclasts,and the inhibitory effect was reversed by IL-1β*** reporter assay and the inhibitor study of IL-1βtranscription suggested that BA inhibited nuclear factor-κB and activator protein-1 by regulating IκB kinase,extracellular signal regulated kinase and P38,resulting in the down-regulation of IL-1β*** also promoted osteoblast ***,BA protected lipopolysaccharide-and ovariectomy-induced bone loss in mice,suggesting therapeutic potential against inflammation-induced bone diseases and postmenopausal osteoporosis.

关键词： Benzydamine Osteoclast Bone Interleukin-1β Nuclear factor-κB Activator protein-1

Engaging in sports via the metaverse? An examination through analysis of metaverse research trends in sports

在线全文

学校读者我要写书评

暂无评论

Data Science and Management

Data Science and Management 2024年第3期7卷 181-188页

作者： Ahyun kim Sang-soo kim Department of Business Administration Dongyang Mirae UniversitySeoul08221South Korea Department of Business Administration Yong in UniversityGyeonggi-do17092South Korea

In sports, virtual spaces are sometimes utilized to enhance performance or user experience. In this study, we conducted a frequency analysis, semantic network analysis, and topic modeling using 134 abstracts obtained through keyword searches focusing on “sport(s)” in combination with “metaverse”, “augmented reality”, “virtual reality”, “lifelogging”, and “mixed reality”. First, the top 20 words were extracted through frequency analysis, and then each type of extracted word was retained to select seven words. The analysis revealed the emergence of key themes such as “user(s)”, “game(s)”, “technolog(y/ies)”, “experience(d)”, “physical”, “training”, and “video”, with variations in intensity depending on the type of metaverse. Second, the relationships between the words were reconfirmed using semantic networks based on the seven selected words. Finally, topic modeling analysis was conducted to uncover themes specific to each type of metaverse. We also found that “performance/scoring” was a prominent word across all types of metaverses. This suggests that in addition to providing enjoyment through sports, there is a high possibility that all users (both general users and athletes) utilize the metaverse to achieve positive outcomes and success. The importance of “performance/scoring” in sports may seem obvious;however, it also provides significant insights for practitioners when combined with metaverse-related keywords. Ultimately, this study has managerial implications for enhancing the performance of specialized users in the sports industry.

关键词： Sport Metaverse Frequency analysis Topic modeling Semantic network analysis