检索结果-南通市图书馆

Graphene Bridge Heterostructure Devices for Negative Differential Transconductance Circuit Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2023年第2期15卷 161-171页

作者： Minjong Lee Tae wook kim Chang yong Park kimoon Lee Takashi Taniguchi Kenji Watanabe Min‑gu kim Do Kyung Hwang Young Tack Lee Department of Electrical and Computer Engineering Inha UniversityIncheon 22212Republic of Korea Department of Materials Science and Engineering The University of Texas at DallasRichardsonTX 75080USA Center for Opto‑Electronic Materials and Devices Post‑Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Physics Kunsan National UniversityGunsan 54150Republic of Korea Advanced Materials Laboratory National Institute for Materials ScienceTsukuba 305‑0044Japan Department of Information and Communication Engineering Inha UniversityIncheon 22212Republic of Korea Division of Nanoscience and Technology KIST SchoolUniversity of Science and Technology(UST)Seoul 02792Republic of Korea Department of Electronic Engineering Inha UniversityIncheon 22212Republic of Korea

Two-dimensional van der Waals(2D vdW)material-based heterostructure devices have been widely studied for high-end electronic applications owing to their heterojunction *** this study,we demonstrate graphene(Gr)-bridge heterostructure devices consisting of laterally series-connected ambipolar semiconductor/Gr-bridge/n-type molybdenum disulfide as a channel material for field-effect transistors(FET).Unlike conventional FET operation,our Gr-bridge devices exhibit nonclassical transfer characteristics(humped transfer curve),thus possessing a negative differential *** phenomena are interpreted as the operating behavior in two series-connected FETs,and they result from the gate-tunable contact capacity of the Gr-bridge ***-value logic inverters and frequency tripler circuits are successfully demonstrated using ambipolar semiconductors with narrow-and wide-bandgap materials as more advanced circuit applications based on non-classical transfer ***,we believe that our innovative and straightforward device structure engineering will be a promising technique for future multi-functional circuit applications of 2D nanoelectronics.

关键词： Graphene bridge Heterostructure device Non-classical transfer characteristics Multi-value logic inverter Frequency tripler

Incorporation of Ionic Conductive Polymers into Sulfide Electrolyte-Based Solid-State Batteries to Enhance Electrochemical Stability and Cycle Life

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第6期7卷 4-12页

作者： Juhyoung kim Woonghee Choi Seong-Ju Hwang Dong wook kim Advanced Materials Division Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Korea Department of Material Science and Engineering Yonsei UniversitySeoul 03722Korea Department of Material Science and Engineering Seoul National UniversitySeoul 08826Korea Advanced Materials and Chemical Engineering University of Science and Technology(UST)Daejeon 34113Korea

Sulfide-based inorganic solid electrolytes are promising materials for high-performance safe solid-state *** high ion conductivity,mechanical characteristics,and good processability of sulfide-based inorganic solid electrolytes are desirable properties for realizing high-performance safe solid-state batteries by replacing conventional liquid ***,the low chemical and electrochemical stability of sulfide-based inorganic solid electrolytes hinder the commercialization of sulfide-based safe solid-state ***,the instability of sulfide-based inorganic solid electrolytes is intensified in the cathode,comprising various *** this study,carbonate-based ionic conductive polymers are introduced to the cathode to protect cathode materials and suppress the reactivity of sulfide *** instruments,including electrochemical spectroscopy,X-ray photoelectron spectroscopy,and scanning electron microscopy,confirm the chemical and electrochemical stability of the polymer electrolytes in contact with sulfide-based inorganic solid ***-based solid-state cells show stable electrochemical performance over 100 cycles when the ionic conductive polymers were applied to the cathode.

关键词： composite cathode electrochemical stability ionic conductive polymer solid-state battery sulfide solid electrolyte

Strangulated small bowel hernia through the port site:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第44期14卷 6881-6883页

作者： Jun Hyun Lee wook kim Department of Surgery Holy Family HospitalCollege of MedicineThe Catholic University of KoreaBucheon 420-717South Korea

Port site hernia develops through a fascial or peritoneal layer that was inadequate or not repaired. It is a rare complication of laparoscopic surgery which may lead to serious problems. Here,we present a 77-year-old female,diagnosed with a small bowel hernia through a 10-mm port site. We had performed ten cases of laparoscopy-assisted distal gastrectomy before this case. The patient complained of left lower abdominal pain with a palpable mass. Abdominal CT showed an incarcerated small bowel hernia and the patient underwent segmental resection of the strangulated small bowel through a minimally extended port site incision.

关键词： Port site hernia Strangulated small bowel Minimally extended port site incision

Low skeletal muscle mass is associated with non-alcoholic fatty liver disease in Korean adults： the Fifth Korea National Health and Nutrition Examination Survey

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2016年第1期15卷 39-47页

作者： hee yeon kim chang wook kim chung-hwa park jong young choi kyungdo han anwar t merchant yong-moon park division of hepatology department of internal medicinecollege of medicinethe catholic university of korea222Banpo-daeroSeocho-guSeou1 06591Republic of Korea department of biostatistics college of medicinethe catholic university of korea222Banpo-daeroSeocho-guSeou1 06591Republic of Korea department of epidemiology and biostatistics arnold school of public healthuniversity of south carolinaColumbiaSC 29208USA epidemiology branch national institute of environmental health sciencesnational institutes of healthdepartment of health and human servicesResearch Triangle ParkNC 27709USA

BACKGROUND： Sarcopenia and non-alcoholic fatty liver dis- ease （NAFLD） share similar pathophysiological mechanisms, and the relationship between sarcopenia and NAFLD has been recently investigated. The study investigated whether low skel- etal muscle mass is differentially associated with NAFLD by gender in Korean adults. METHODS： We conducted a cross-sectional analysis of the data from the Fifth Korea National Health and Nutrition Examination Survey. The skeletal muscle index （SMI） was obtained by the appendicular skeletal muscle mass divided by the weight. NAFLD was defined as a fatty liver index （FLI）〉60 in the absence of other chronic liver disease. RESULTS： Among the included subjects, 18.3% （SE： 1.4%） in men and 7.0% （SE： 0.7%） in women were classified as having FLI-defined NAFLD. Most of the risk factors for FLI-defined NAFLD showed a significant negative correlation with the SMI in both genders. Multiple logistic regression analysis showed that low SMI was associated with FLI-defined NAFLD, inde- pendent of other metabolic and lifestyle parameters in both genders [males： odds ratio （OR）=1.35; 95% confidence inter- val （CI）： 1.17-1.54; females： OR=1.36; 95% CI： 1.18-1.55]. The magnitude of the association between FLI-defined NAFLD and low SMI was higher in middle aged to elderly males （OR-1.50; 95% CI： 1.22-1.84） than in males less than 45 years of age （OR=1.25; 95% CI： 1.02-1.52） and in premenopausal females （OR=l.50; 95% CI： 1.12-2.03） than in postmenopausal females （OR-1.36; 95% CI： 1.20-1.54）.CONCLUSIONS： Low SMI is associated with the risk of FLI- defined NAFLD independent of other well-known metabolic risk factors in both genders. This association may differ ac- cording to age group or menopausal status. Further studies are warranted to confirm this relationship.

关键词： Korea National Health and Nutrition Examination Survey non-alcoholic fatty liver disease sarcopenia skeletal muscle

Effect of itopride, a new prokinetic, in patients with mild GERD: A pilot study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第27期11卷 4210-4214页

作者： yong Sung kim Tae Hyeon kim Chang Soo Choi Young Woo Shon Sang wook kim Geom Seog Seo yong Ho Nah Myung Gyu Choi Suck Chei Choi Department of Internal Medicine

AIM： Itopride is a newly developed prokinetic agent, which enhances gastric motility through both antidopaminergic and anti-acetylcholinesterasic actions. The importance of esophageal motor dysfunction in the pathogenesis of gastro-esophageal reflux disease （GERD） makes it interesting to examine the effect of itopride on esophageal acid ***： The effect of itopride on esophageal acid reflux variables for 24 h was studied in 26 patients with GERD symptoms, pre-entry total acid exposure time （pH〈4） of more than 5% and mild esophagitis （SavaryMiller grades I, II） proven by endoscopy. Ambulatory 24hpH-metry and symptom assessment were performed after treatments with 150 or 300 mg itopride thrice a day （t.i.d.） for 30 d in random order, using an open label *** evaluating the safety of itopride, blood biochemical laboratory test was performed and the serum prolactin level was also examined before and after ***： Total symptom score was significantly decreased after treatment in 150- or 300-mg group. Itopride 300 mg was significantly effective than 150 mg on decreasing the total per cent time with pH〈4, total time with pH〈4 and DeMeester score. No serious adverse effects were observed with administration of itopride in both ***： Itopride 100 mg t.i.d, is effective on decreasing pathologic reflux in patient with GERD and therefore it has the potential to be effective in the treatment of this disease.

关键词： Gastro-esophageal reflux disease Itopride

Recurrent gastric neuroendocrine tumors treated with total gastrectomy

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 2015年第46期21卷 13195-13200页

作者： Myounghwa Jung Jung-wook kim Jae-Young Jang Young Woon Chang Sun Hee Park yong Ho kim Youn Wha kim Department of Internal Medicine College of MedicineKyung Hee University Department of Surgery College of MedicineKyung Hee University Department of Pathology College of MedicineKyung Hee University

Gastric neuroendocrine tumors are rare; however,the incidence has recently increased due to the increasing use of upper endoscopy. Neuroendocrine tumors arise from the excess proliferation of enterochromaffinlike(ECL) cells. The proliferative changes of enterochromaffin cells evolve through a hyperplasiadysplasia-neoplasia sequence that is believed to underlie the pathogenesis of gastric neuroendocrine tumors. Endoscopic resection is recommended as the initial treatment if the tumor is not in an advanced stage. However,there is no definite guideline for the treatment of recurrent gastric neuroendocrine tumors following endoscopic resection. Here,we report a rare case of gastric neuroendocrine tumors in a 56-yearold male who experienced two recurrences within 11 years after endoscopic resection. The patient finally underwent a total gastrectomy. The pathological features of the resected stomach exhibited the full hyperplasia-dysplasia-neoplasia sequence of the ECL cells in a single specimen.

关键词： Neuroendocrine tumor Hyperplasia of neuroendocrine

Simple reactor for the synthesis of silver nanoparticles with the assistance of ethanol by gas-liquid discharge plasma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2019年第4期21卷 34-43页

作者： Pan LU Dong-wook kim Dong-Wha PARK Department of Chemistry and Chemical Engineering Inha University100 Inha-Ro.Michuhol-guIncheon 22212Republic of Korea Regional Innovation Center for Environmental Technology of Thermal Plasma(RIC-ETTP: Inha University100 Inha-RoMichuhol-gu.Incheon 22212.Republic of Korea

Atmospheric pressure plasma technology is gaining increasing importance because it is a simple and tunable synthesis process for the production of metallic *** addition to the development of the power supply,improving the reactor is also one of the main strategies to enhanee the *** this study,a simple reactor for the gas-liquid discharge plasma induced by argon gas was applied to synthesize silver nanopailicles from silver nitrate(AgNO3)in *** AC power supply with a peak voltage of 3.5 kV was *** frequency and on-time were set to 50 kHz and 2.5“s,*** oscilloscope showed that the rising time was approximately 2“*** ethanol was used as the source for the reactive reducing *** more additional comp on ents existed in the solution during the discharge and neither of the electrodes was in contact with the treated *** temperature in creased by 10°C within 1 min without a cooling *** was the main impurity and was expected to be produced from the decomposition of the organics under the *** elevated temperature decreased the organic by-products by evaporation and could also decrease the production of *** electron microscopy showed that the spherical silver nanoparticles with a size of approximately 10 nm were synthesized with a crystal structure and that a low concentration of ethanol prefers the production of the mono-dispersed colloid.

关键词： silver nanoparticles synthesis nonthermal plasma ethanol reduction gas-liquid discharge

Improved corrosion resistance of Mg alloy AZ31B induced by selective evaporation of Mg using large pulsed electron beam irradiation

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第5期35卷 891-901页

作者： Woo Jin Lee Jisoo kim Hyung wook Park Department of Mechanical Aerospace and Nuclear Engineering Ulsan National Institute of Science and Technology

Large pulsed electron beam(LPEB) irradiation was employed as a surface treatment of magnesium(Mg)alloy AZ31B to enhance its corrosion and wear resistance. Selective evaporation of Mg induced by LPEB irradiation at an energy density of 5J/cm^2 for 40 cycles has led to the formation of an Al-enriched resolidified layer with nano-grained structure consisting of Mg3.1 Al0.9 metastable phase. The formation of such a re-solidified layer after LPEB irradiation has enabled a decrease in corrosion rate of Mg alloy AZ31B in 3.5% NaCl solution. Different equivalent electrical circuit models were proposed to account for the corrosion behavior of untreated Mg alloy AZ31B and those subjected to LPEB irradiation. A decrease in wear depth when compared to that of the untreated alloy suggests an increase in wear resistance of LPEB-irradiated Mg alloy AZ31B. Adhesive wear is the predominant mechanism of untreated Mg alloy AZ31B while abrasive wear mechanism dominates for LPEB-irradiated Mg alloy AZ31B.

关键词： Magnesium alloys Electron beam treatment Corrosion resistance Microstructure Rapid re-solidification Wear resistance

Patient-reported ejaculatory function and satisfaction in men with lower urinary tract symptoms/benign prostatic hyperplasia

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2018年第1期20卷 69-74页

作者： Min Chul Cho Jung Kwon kim Sang Hoon Song Sung yong Cho Sang wook Lee Soo Woong kim Jae-Seung Paick Department of Urology Seoul National University Boramae Medical Center Seou107061 Korea Department of Urology Seoul National University College of Medicine Seoul 03080 Korea Department of Urology Asan Medical Center Seou105505 Korea Department of Urology Kangwon National University College of Medicine Chuncheon 24289 Korea

This study aimed to investigate perceived ejaculatory function/satisfaction before treatment for lower urinary tract symptoms （LUTS）/benign prostatic hyperplasia （BPH） and to identify associations between specific categories of ejaculatory dysfunctions （EjDs） and LUTS. A total of 1574 treatment-naive men with LUTS/BPH were included in this study. All patients underwent routine evaluation for LUTS/BPH including the International Index of Erectile Function and a 5-item questionnaire developed to assess ejaculatory volume/force/pain/satisfaction/latency time. Patients who had sexual intercourse over the past 4 weeks were classified as sexually active group. A total of 783 patients were categorized as sexually active group. Decreased ejaculatory volume and force were reported by 53.4% and 55.7% of 783 sexually active men, respectively, There was a strong correlation between ejaculatory volume and force. Ejaculatory pain/discomfort, premature ejaculation （PE）, and delayed ejaculation （DE） were reported in 41,0%, 16.3%, and 41.4% of the patients, respectively. Over 40.0% of men without decreased ejaculation volume/force were satisfied with ejaculatory function, whereas approximately 6.0% of men with decreased volume/force were satisfied with ejaculatory function. About 30.0% of men with decreased volume/force had orgasmic dysfunction, while approximately 10.0% of men without decreased volume/force did. Decreased ejaculatory volume or force was associated with LUTS severity after adjusting for other influential factors including testosterone level, erectile function, and prostate size on ultrasonography, but PE or DE or ejaculatory pain/discomfort was not. In conclusion, a considerable portion of men with LUTS/BPH appear to have a variety of EjDs. Ejaculatory volume/force and satisfaction/orgasm do not always appear to be concordant. Ejaculatory volume or force is independently associated with LUTS severity, whereas PE or DE or ejaculatory pain/discomfort is not.

关键词： dysfunction ejaculation lower urinary tract symptoms (LUTS) satisfaction