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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

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

Long term survivor of cerebellar glioblastoma multiforme:Case report

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Long term survivor of cerebellar glioblastoma multiforme:Cas...

Surgical outcomes for vestibular schwannoma via retrosigmoid approach

中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Seung Hwan Lee Bong Jin Park hyuk jae choi Seok Geun choi Sung Bum Kim Tae Sung Kim Bong Arm Rhee Young-Jin Lim Department of Neurosurgery School of MedicineKyung Hee University Hospital

＜正＞Objective:It is well known that the glioblastoma multiforme（GBM） is hard to cure despite aggressive treatment application such as maximal surgical removal and concurrent chemoradiotherapy（CCRT）.Furthermore,w...

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Surgical outcomes for vestibular schwannoma via retrosigmoid...

The result of long term follow up in Malignant Meningiomas

中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Seung Hwan Lee Bong Jin Park hyuk jae choi Seok Keun choi Seung Bum Kim Tae Sung Kim Bong Arm Rhee Young Jin Lim Department of Neurosurgery School of MedicineKyung Hee University Hospital

＜正＞Objective:The use of several approaches,involving different cerebello-pontine angles,has enabled vestibular schwannoma removal to be tailored to each patient’s pathology and physiological *** retrosigmoid appro...

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The result of long term follow up in Malignant Meningiomas

Variations in dynamic recrystallization behavior and mechanical properties of AZ31 alloy with extrusion temperature

中国抗癌协会神经肿瘤专业委员会第八届学术会议

作者： Seung Hwan Lee Bong Jin Park hyuk jae choi Seok Keun choi Sung Bum Kim Tae Sung Kim Bong Arm Rhee Young Jin Lim Department of Neurosurgery School of MedicineKyung Hee University Hospital

＜正＞Objective:Malignant meningiomas are rare and have worse prognosis than benign meningiomas. Moreover,postoperative radiation therapy is widely accepted to be requisite for treatment *** analyzed the therapeutic e...

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Journal of Magnesium and Alloys 2023年第7期11卷 2351-2365页

作者： jae Won Cha Sung hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea

This study investigates the effects of extrusion temperature on the dynamic recrystallization(DRX)behavior of a Mg-3Al-1Zn-0.3Mn(AZ31,wt%)alloy during hot extrusion and on the microstructural characteristics and mechanical properties of materials extruded at 350 and 450℃.An increase in the extrusion temperature causes a decrease in the amount of strain energy accumulated in the material during extrusion,because of promoted activation of pyramidalslip and dynamic *** reduced strain energy weakens the DRX behavior during extrusion,which eventually results in a decrease in the area fraction of recrystallized grains of the extruded *** material extruded at 450℃has coarser grains and a stronger basal fiber texture than that extruded at 350℃.As the extrusion temperature increases from 350 to 450℃,the tensile yield strength(TYS)of the extruded material increases from 191.8 to 201.5 MPa,whereas its compressive yield strength(CYS)decreases from 122.5 to 111.0 MPa;consequently,its tension-compression yield stress ratio(CYS/TYS)decreases from 0.64 to *** increase in the TYS is attributed mainly to the stronger texture hardening and strain hardening effects of the extruded material,and the decrease in the CYS is attributed to the reduced twinning stress resulting from grain coarsening and texture *** microstructural and textural evolutions of the materials during extrusion and the deformation and hardening mechanisms of the extruded materials are discussed in detail.

关键词： Mg-Al-Zn alloy Extrusion Dynamic recrystallization Microstructure Yield asymmetry

Role of multidetector computed tomography in patients with acute infectious colitis

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World Journal of Clinical Cases 2022年第12期10卷 3686-3697页

作者： Seung Jung Yu jae hyuk Heo Eun Jeong choi Jong hyuk Kim Hong Sub Lee Sun Young Kim jae Hoon Lim Department of Internal Medicine Inje University Busan Paik HospitalBusan 47392South Korea Department of Radiology Myongji HospitalHanyang University College of MedicineGoyang 10475South Korea Department of Cancer Control and Population Health National Cancer CenterGoyang 10408South Korea

BACKGROUND The role of multidetector computed tomography(MDCT)in patients with acute infectious colitis is still *** To examine the usefulness of MDCT in distinguishing the etiology of acute infectious *** Overall,244 patients who met the criteria for acute infectious colitis and visited the Hospital from February 2015 to 2018 were retrospectively enrolled and divided into two groups(bacterial:204,viral:40)according to causes of acute colitis,based on stool *** MDCT parameters,including wall thickening,submucosal edema,mucosal enhancement,serosa involvement,empty colon sign,small bowel involvement,comb sign,continuous distribution,accordion sign,mucosal thickening,and lymph node enlargement,were constructed in a blinded *** MDCT parameters of wall thickening(OR:13.60;95%CI:5.80–31.88;P<0.001),submucosal edema(OR:36.08;95%CI:13.54–96.13;P<0.001),mucosal enhancement(OR:22.55;95%CI:9.28–54.81;P<0.001),serosal involvement(OR:14.50;95%CI:3.33–63.23;P<0.001),empty colon sign(OR:6.68;95%CI: 2.44–18.32;P < 0.001), continuous distribution (OR: 24.09;95%CI: 9.38–61.90;P < 0.001), accordionsign (OR: 9.02;95%CI: 1.12–72.35;P = 0.038), mucosal thickening (OR: 46.41;95%CI: 10.38–207.51;P< 0.001), and lymph node enlargement (OR: 4.39;95%CI: 1.22–15.72;P = 0.023) were significantlyassociated with bacterial colitis. At least one positive finding in four CT outcomes (submucosaledema, mucosal enhancement, continuous distribution, mucosal thickening) in summer showed ahigh probability of bacterial colitis (sensitivity, 41.67;specificity, 92.50;OR: 24.95).CONCLUSIONMDCT provides many clues that can be useful in suggesting a specific etiology of acute infectiouscolitis.

关键词： Colitis Multidetector computed tomography Differential diagnosis Bacterial infections Viral infections

Infrared-harvesting colloidal quantum dot inks for efficient photovoltaics: Impact of surface chemistry and device engineering

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Journal of Materials Science & Technology 2023年第16期147卷 224-240页

作者： Younghoon Kim Min-jae choi Jongmin choi Department of Chemistry Kookmin UniversitySeoul02707Republic of Korea Department of Chemical and Biochemical Engineering Dongguk UniversitySeoul04620Republic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu42988Republic of Korea

Colloidal quantum dots(CQDs)are promising semiconducting materials,which can be used as a photoactive layer in various optoelectronic applications,because of their size-tunable bandgap energy,solution processability,and excellent optical and optoelectronic *** particular,these features have generated great interest in the development of CQD solar cells and led to a rapid increase in their power conversion *** improvements were enabled by many innovative approaches in terms of CQD’s surface chemistry and device architecture *** this review,a critical overview of the research progress in CQD solar cells is presented with a focus on the strategies adopted for achieving record efficiency in CQD solar *** strategies include the use of organic/inorganic surface ligands,pre-and post-treatment of CQDs,and solid-state/solution-phase ligand ***,we provide an understanding of the research history to inspire the rational design of next-generation CQD optoelectronic devices,such as solar cells,light-emitting diodes,and *** research on the development of infrared CQD solar cells as complementary platforms to other solar cell technologies is also critically discussed to provide another perspective on CQD technologies.

关键词： Quantum dot Lead sulfide Ligand exchange Colloidal ink Infrared light Solar cell

Practical operating flexibility of a bifunctional freestanding membrane for efficient anion exchange membrane water electrolysis across all current ranges

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Carbon Energy 2024年第9期6卷 306-324页

作者： Hong-Jin Son Jeemin Hwang Min Young choi Seung Hee Park jae hyuk Jang Byungchan Han Sung Hoon Ahn Department of Bio-Chemical Engineering Chosun UniversityGwangjuRepublic of Korea Fuel Cell Research and Demonstration Center Hydrogen Energy Research DivisionKorea Institute of Energy Research(KIER)Buan-gunJeollabuk-doRepublic of Korea Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoulRepublic of Korea Center for Research Equipment Korea Basic Science InstituteDaejeonRepublic of Korea

This study explores a symmetric configuration approach in anion exchange membrane(AEM)water electrolysis,focusing on overcoming adaptability challenges in dynamic ***,a rapid and mild synthesis technique for fabricating fibrous membrane-type catalyst electrodes is *** method leverages the contrasting oxidation states between the sulfur-doped NiFe(OH)_(2) shell and the metallic Ni core,as revealed by electron energy loss *** evaluations confirm that the S–NiFe(OH)_(2) active sites optimize free energy for alkaline water electrolysis *** technique bypasses traditional energy-intensive processes,achieving superior bifunctional activity beyond current *** symmetric AEM water electrolyzer demonstrates a current density of 2 A cm^(-2) at 1.78 V at 60℃ in 1 M KOH electrolyte and also sustains ampere-scale water electrolysis below 2.0 V for 140 h even in ambient *** results highlight the system's operational flexibility and structural stability,marking a significant advance-ment in AEM water electrolysis technology.

关键词： AEM water electrolysis fibrous membrane iR correction free operational stability symmetric configuration