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低占空比高强聚焦超声在兔子耳部血管中导致的升温作用

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声学技术 2007年第5期26卷 1036-1037页

作者：屠娟 hwang joo-ha 南京大学教育部近代声学重点实验室南京210093 华盛顿大学美国西雅图98105

近年来．随着超声医学研究的发展．高强聚焦超声在临床医学方面的应用日益得到重视。研究者们发现．超声空化效应是高强聚焦超声的生物效应的重要作用机理之一（主要是超声空化效应）。超声作用在生物体上时所产生的空化效应可以在很短... 详细信息

近年来．随着超声医学研究的发展．高强聚焦超声在临床医学方面的应用日益得到重视。研究者们发现．超声空化效应是高强聚焦超声的生物效应的重要作用机理之一（主要是超声空化效应）。超声作用在生物体上时所产生的空化效应可以在很短时问内产生巨大能量，达到基因／药物输运，杀死肿瘤细胞．阻塞病变血管，止血等目的洲。然而在产生理想的治疗作用的同时，超声的空化作用也可能造成正常细胞或组织的损伤，而产生此类损伤的重要因素之一是由空化泡瞬间破裂放出巨大能量引起温度迅速上升所导致的热损伤。因此，如果在有效利用高强聚焦超声的治疗作用的同时，避免产生热损伤已经成为超声临床医学的重要课题。本文的工作旨在研究在低占空比条件下高强聚焦超声的空化效应在兔子耳部血管中所产生的升温作用。

关键词：低占空比高强聚焦超声兔子耳部血管升温作用超声空化效应超声医学

低占空比高强聚焦超声在兔子耳部血管中导致的升温作用

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低占空比高强聚焦超声在兔子耳部血管中导致的升温作用

Endoscopic resection of gastric and esophageal cancer

中国声学学会2007年青年学术会议

作者：屠娟 hwang joo-ha 南京大学教育部近代声学重点实验室华盛顿大学

＜正＞1 引言近年来,随着超声医学研究的发展,高强聚焦超声在临床医学方面的应用日益得到重视。研究者们发现,超声空化效应是高强聚焦超声的生物效应的重要作用机理之一（主要是超声空化效应）。超声作用在生物体上时所产生的空化效应... 详细信息

＜正＞1 引言近年来,随着超声医学研究的发展,高强聚焦超声在临床医学方面的应用日益得到重视。研究者们发现,超声空化效应是高强聚焦超声的生物效应的重要作用机理之一（主要是超声空化效应）。超声作用在生物体上时所产生的空化效应可以在很短时间内产生巨大能量,达到基因/药物输运,杀死肿瘤

关键词：超声医学超声疗法超声空化

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Gastroenterology Report 2015年第4期3卷 330-338,I0002页

作者： Bryan Balmadrid joo ha hwang Division of Gastroenterology University of WashingtonSeattleWAUSA

Endoscopic submucosal dissection(ESD)and endoscopic mucosal resection(EMR)techniques have reduced the need for surgery in early esophageal and gastric cancers and thus has lessened morbidity and mortality in these *** is a relatively new technique in western countries and requires rigorous training to reproduce the proficiency of Asian countries,such as Korea and Japan,which have very high complete(en bloc)resection rates and low complication *** plays a valuable role in early esophageal *** has shown better en bloc resection rates but it is easier to master and maintain proficiency in EMR;it also requires less procedural *** early esophageal adenocarcinoma arising from Barrett’s,ESD and EMR techniques are usually combined with other ablative modalities,the most common being radiofrequency ablation because it has the largest dataset to prove its *** EMR techniques have been used with some success in early gastric cancers but ESD is currently preferred for most of these *** has the added advantage of resecting into the submucosa and thus allowing for endoscopic resection of more aggressive(deeper)early gastric cancer.

关键词： endoscopic submucosal dissection endoscopic mucosal resection endoscopic ablation early gastric cancer early esophageal cancer

Learning models for endoscopic ultrasonography in gastrointestinal endoscopy

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World Journal of Gastroenterology 2015年第17期21卷 5176-5182页

作者： Gwang ha Kim Sung Jo Bang joo ha hwang Department of Internal Medicine Pusan National University School of Medicine Biomedical Research Institute Pusan National University HospitalBusan 602-739South Korea Department of Internal Medicine Ulsan University Hospital University of Ulsan College of Medicine Ulsan 682-714South Korea Division of Gastroenterology Department of MedicineUniversity of WashingtonSeattleWA 98104United States

Endoscopic ultrasonography(EUS) has become a useful diagnostic and therapeutic modality in gastrointestinal ***,EUS requires additional training since it requires simultaneous endoscopic manipulation and ultrasonographic *** adequate EUS training can be challenging since EUS is highly operator-dependent and training on actual patients can be associated with an increased risk of complications including inaccurate ***,several models have been developed to help facilitate training of *** models currently available for EUS training include computer-based simulators,phantoms,ex vivo models,and live animal *** each model has its own merits and limitations,the value of these different models is rather complementary than ***,there is a lack of objective data regarding the efficacy of each model with recommendations on the use of various training models based on expert opinion ***,objective studies evaluating the efficacy of various EUS training models on technical and clinical outcomes are still needed.

关键词： Endoscopic ultrasonography Training Phantom Computer simulation Animal model

Selective catalytic NO_x reduction on Antimony promoted V_2O_5-Sb/TiO_2 catalyst

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Rare Metals 2006年第Z2期25卷 84-88页

作者： ha Heon Phil CHUNG Soon Hyo OH Young joo Metal Processing Research Center Korea Institute of Science and Technology Cheongryang Seoul 130-650 Republic of Korea

Quantum chemical calculation was carried out to choose a promoter which can reduce the poisoning of V2O5/TiO2 catalysts by SO2. Several atoms were chosen as candidates and new catalysts were synthesized by impregnation method. The NOx conversion rate was measured at temperatures between 100 and 400 ℃ and poisoning effect was investigated. The most promising candidate promoter, Se, was excluded because of its high vapor pressure. On the other hand, Sb shows best promoting properties. Sb promoted catalyst reaches the maximum NOx conversion rate at 250 ℃. It also shows considerably enhanced resistance to poisoning of V2O5/TiO2 catalysts by SO2.

关键词： De NOx selective catalytic reduction SO2 poisoning low temperature activity

Gastric per-oral endoscopic myotomy: Current status and future directions

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World Journal of Gastroenterology 2019年第21期25卷 2581-2590页

作者： Alexander Podboy joo ha hwang Linda A Nguyen Patricia Garcia Thomas A Zikos Afrin Kamal George Triadafilopoulos John O Clarke Division of Gastroenterology and Hepatology Stanford University School of Medicine

Gastroparesis, or symptomatic delayed gastric emptying in the absence of mechanical obstruction, is a challenging and increasingly identified syndrome. Medical options are limited and the only medication approved by the Food and Drug Administration for treatment of gastroparesis is metoclopramide, although other agents are frequently used off label. With this caveat, first-line treatments for gastroparesis include dietary modifications, antiemetics and promotility agents, although these therapies are limited by suboptimal efficacy and significant medication side effects. Treatment of patients that fail first-line treatments represents a significant therapeutic challenge. Recent advances in endoscopic techniques have led to the development of a promising novel endoscopic therapy for gastroparesis via endoscopic pyloromyotomy, also referred to as gastric per-oral endoscopic myotomy or per-oral endoscopic pyloromyotomy. The aim of this article is to review the technical aspects of the per-oral endoscopic myotomy procedure for the treatment of gastroparesis, provide an overview of the currently published literature, and outline potential next directions for the field.

关键词： Gastroparesis Gastric per-oral endoscopic myotomy Per-oral endoscopic pyloromyotomy Myotomy Endoscopic myotomy Peroral endoscopic myotomy Gastric emptying

Choroidal and skin metastases from colorectal cancer

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World Journal of Gastroenterology 2016年第43期22卷 9650-9653页

作者： joo Young ha Edward Hynseung Oh Moon Ki Jung Song Ee Park Ji Tak Kim In Gyu hwang Department of Internal Medicine Chung-Ang University College of Medicine Department of Internal Medicine Division of Hemato-oncology Chung-Ang University College of Medicine Department of Ophthalmology Chung-Ang University College of Medicine

Choroidal and skin metastasis of colon cancer is rare. In women, the frequency of cutaneous metastasis from colon cancer as the primary lesion in is 9% and skin metastasis occurs in 0.81% of all colorectal cancers. We report a patient with colonic adenocarcinoma who presented with visual disorder in her right eye and scalp pain as her initial symptoms. Contrast-enhance orbital magnetic resonance imaging with fat suppression revealed an infrabulbar mass, and skin biopsy of the posterior parietal scalp confirmed adenocarcinoma. These symptoms were diagnosed as being caused by choroidal and skin metastases of colonic adenocarcinoma. We started palliative chemotherapy with oral capecitabine(1000 mg/m2, twice a day, on days 1-14) every 3 wk, which was effective at shrinking the brain masses and improving the visual disorder. This is the first report that capecitabine is effective at reducing a choroidal and cutaneous metastatic lesion from rightsided colorectal cancer.

关键词： Colon cancer Choroid cancer Skin cancer Capecitabine

Surface properties of Al-doped ZnO thin film before and after CF_4/Ar plasma etching

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Plasma Science and Technology 2022年第7期24卷 194-200页

作者： Young-Hee joo Gwan-ha KIM Doo-Seung UM Chang-Il KIM School of Electrical and Electronics Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Semiconductor Materials and Applications Korea PolytechnicSeongnam 13122Republic of Korea Department of Electrical Engineering Sejong UniversitySeoul 05006Republic of Korea

Al-doped ZnO(AZO) is considered as an alternative to transparent conductive oxide *** and achieving a stable surface are important challenges in the development and optimization of dry etching processes, which must be overcome for the application of AZO in various devices. Therefore, in this study, the etch rate and surface properties of an AZO thin film after plasma etching using the adaptive coupled plasma system were investigated. The fastest etch rate was achieved with a CF_(4)/Ar ratio of 50:50 sccm. Regardless of the ratio of CF_(4) to Ar,the transmittance of the film in the visible region exceeded 80%. X-ray photoelectron spectroscopy analysis of the AZO thin film confirmed that metal-F bonding persists on the surface after plasma etching. It was also shown that F eliminates O vacancies. Consequently, the work function and bandgap energy increased as the ratio of CF-4 increased. This study not only provides information on the effect of plasma on AZO thin film, but identifies the cause of changes in the device characteristics during device fabrication.

关键词： Al-doped ZnO plasma etching F-based plasma surface characteristics X-ray photoelectron spectroscopy ultraviolet photoelectron spectroscopy

Cavernous mesenteric lymphangiomatosis mimicking metastasis in a patient with rectal cancer:A case report

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World Journal of Gastroenterology 2009年第31期15卷 3947-3949页

作者： Seong Su hwang Hyun joo Choi Soo Youn Park Department of Radiology St.Vincent's HospitalCollege of MedicineThe Catholic University of Korea Department of Pathology St.Vincent's HospitalCollege of MedicineThe Catholic University of Korea

Lymphangioma usually occurs in children and usually involves the skin. Mesenteric lymphangioma is extremely rare in adults. Typically, lymphangioma appears on computed tomography (CT) as a lower attenuation of a cystic mass, however, some cases appear to be a solid mass. We describe the CT and 18F-FDG positron emission tomography/CT appearance in a case of jejunal and mesenteric cavernous lymphangi-omatosis mimicking metastasis in an adult patient with rectal cancer.

关键词： Lymphangioma Lymphangiomatosis Mesentern/ Small intestine Computed tomography 18F-FDG positron emission tomography/computed tomography