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Comparative study for predictability of type 1 gastric variceal rebleeding after endoscopic variceal ligation:High-frequency intraluminal ultrasound study

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World Journal of Clinical Cases 2021年第34期9卷 10566-10575页

作者： jeong Hwan Kim Won Hyeok Choe Sun-Young Lee so Young Kwon In-Kyung Sung Hyung Seok park Department of Internal Medicine Konkuk University School of MedicineKonkuk University Medical CenterSeoul 05030South Korea Department of Internal Medicine Konkuk University Medical CenterSeoul 143729South Korea Department of Internal Medicine Konkuk University School of MedicineSeoul 05030South Korea Department of Internal Medicine Digestive Disease CenterKonkuk University School of MedicineSeoul 05030South Korea

BACKGROUND The efficacy of endoscopic ultrasonography for the follow-up of gastric varices treated with endoscopic variceal ligation(EVL)has not been *** To evaluate the diagnostic correlation of esophagogastroduodenoscopy(EGD)and high-frequency intraluminal ultrasound(HFIUS)for type 1 gastric varices(GOV1)after EVL and to identify the predictability for rebleeding of EGD and *** In liver cirrhosis patients with GOV1,we performed endoscopic follow-up using EGD and HFIUS synchronously after EVL for hemorrhage from *** grading and red color signs were analyzed using EGD,and the largest variceal cross-sectional areas were measured using *** addition,1-year follow-up was *** rebleeding was defined as the presence of hematemesis,hematochezia,or melena without other evidence of bleeding on endoscopic *** In 26 patients with GOV1,variceal cross-sectional areas on HFIUS of GOV1 was poorly correlated with EGD grading of GOV1(r=0.36).In 17 patients who completed the 1-year follow-up,variceal cross-sectional areas on HFIUS was a good predictor of subsequent rebleeding,whereas EGD grading was not a predictor of subsequent *** HFIUS measurement is more predictive of GOV1 rebleeding than EGD grading,so HFIUS measurement may be necessary for endoscopic follow-up after EVL in patients with GOV1.

关键词： Endoscopic variceal ligation Esophagogastroduodenoscopy High-frequency intraluminal ultrasound Rebleeding Type 1 gastric varices

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Complete resection of large-cell neuroendocrine and hepatocellular carcinoma of the liver: A case report

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World Journal of Clinical Cases 2022年第23期10卷 8277-8283页

作者： Byeong Gwan Noh Hyung-Il Seo Young Mok park Suk Kim Seung Baek Hong so jeong Lee Division of HBP Surgery and Transplantation Department of SurgeryPusan National University School of MedicineBiomedical Research InstitutePusan National University HospitalBusan 49241South Korea Department of Radiology Pusan National University School of MedicineBiomedical Research InstitutePusan National University HospitalBusan 49241South Korea Department of Pathology Pusan National University School of MedicineBiomedical Research InstitutePusan National University HospitalBusan 49241South Korea

BACKGROUND Combined tumors comprising large-cell neuroendocrine carcinoma and hepatocellular carcinoma have been rarely reported in the *** SUMMARY We report a case of a 73-year-old woman with chronic hepatitis B suspected to have a malignant hepatic mass(segment 3;size,4.5 cm)and lymph node metastasis based on computed tomography and magnetic resonance *** being Child-Pugh class A,esophageal varices were *** underwent left lateral sectionectomy and lymph node *** examination revealed a collision tumor consisting of large-cell neuroendocrine(90%)and hepatocellular(10%)*** combined carcinoma had metastasized to one of the three lymph nodes *** patient recovered without any postoperative complications and was discharged in good condition on postoperative day *** chemotherapy was not *** recurrence occurred during a follow-up period of 24 *** To improve the therapeutic management of combined tumors in the liver,it is necessary to discuss each clinical experience and consider an appropriate method for the preoperative diagnosis and treatment.

关键词： Hepatocellular carcinoma Neuroendocrine carcinoma Chronic hepatitis B Case report

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Effect of pulse time on surface characteristics and corrosion resistance during pulse electrochemical polishing

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中国有色金属学会会刊：英文版 2012年第S3期22卷 876-880页

作者： Young-Bin KIM jeong-Woo park Department of Advanced Parts and Materials Engineering Chosun University Department of Mechanical Design Engineering Chosun University

Pulse electrochemical polishing (PECP) was used to improve the mechanical properties,such as surface roughness and corrosion resistance,of conductive metallic *** can provide a smooth,bright,reflective,and deburred surface that exhibits superior corrosion *** this work,stainless steel was used as the anode,and copper was used as the cathode due to their low electrical *** surface roughness of the PECP sample was measured by atomic force microscopy (AFM).A scanning electron microscope (SEM) was used to observe surface characteristics,and an Auger electron spectroscope (AES) was used to analyze the metallurgical composition and thickness of the passive *** aim of this research was to compare the corrosion resistance rates of the unprocessed and PECP-processed stainless steel.

关键词： stainless stell pulse electrochemical polishing corrosion resistance

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Appendectomy in patient with suspected COVID-19 with negative COVID-19 results: A case report

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World Journal of Clinical Cases 2020年第10期8卷 1944-1949页

作者： Changho Kim Jong Kun Kim In Hwan Yeo Jae Young Choe jeong Eun Lee so jeong Kang Chan Sub park Ki Tae Kwon soyoon Hwang Department of Emergency Medicine School of MedicineKyungpook National UniversityDaegu 41944South Korea Department of Anesthesiology and Pain Medicine School of MedicineKyungpook National UniversityKyungpook National University HospitalDaegu 41944South Korea Department of Surgery School of MedicineKyungpook National UniversityKyungpook National University HospitalDaegu 41944South Korea Department of Internal Medicine School of MedicineKyungpook National UniversityDaeguKoreaDepartment of Infection ControlKyungpook National University Chilgok HospitalDaegu 41944South Korea

BACKGROUND Even at present,we are in the middle of the novel coronavirus disease 2019(COVID-19)pandemic and are facing challenges in trial and ***,emergency surgery for patients with suspected COVID-19 is burdensome not only for patients but also for healthcare ***,we established a surveillance system in the emergency room and established principles for managing patients suspected of COVID-19 who require emergency *** SUMMARY A 67-year-old man was diagnosed with appendicitis in March *** wife was diagnosed with COVID-1910 d earlier,and the patient was in close contact with *** patient tested negative twice on an upper respiratory COVID-19 reverse transcription–polymerase chain reaction screening test,but chest X-ray and chest computed tomography revealed patchy ground-glass opacity in both upper lobes of the patient’s *** same emergency surgery procedure for patients with confirmed COVID-19 was applied to this patient suspected of having the disease to ensure that surgery was not delayed while waiting for the reverse transcription–polymerase chain reaction results.A few hours after surgery,the upper respiratory tract specimen taken in the emergency room was negative for COVID-19 but the lower respiratory tract specimen was found to be positive for the *** When COVID-19 is suspected,emergency surgery should be performed as for confirmed COVID-19 without delay.

关键词： COVID-19 Appendicitis Appendectomy Emergency room Infection control Case report

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Evaluation of Heavy Rainfall Model Forecasts over the Korean Peninsula Using Different Physical Parameterization Schemes and Horizontal Resolution

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Advances in Atmospheric Sciences 2011年第6期28卷 1233-1245页

作者： jeong-Gyun park Dong-Kyou LEE Atmospheric Sciences Program School of Earth and Environmental Sciences Seoul National University Seoul 151-747 Korea

In this study, the accuracy of a Pennsylvania State University–National Center for Atmospheric Research mesoscale model （PSU/NCAR MM5） for predicting heavy summer precipitation over the Korean Peninsula was investigated. A total of 1800 simulations were performed using this model for 30 heavy rainfall events employing four cumulus parameterization schemes （CPS）, two grid-scale resolvable precipitation schemes （GRS）, and two planetary boundary layer （PBL） schemes in three model resolutions （90 km, 30 km, and 10 km）. The heavy rainfall events were mesoscale convective systems developed under the influence of mid-latitude baroclinic systems with low-level moisture transport from the ocean. The predictive accuracy for maximum rainfall was approximately 80% for 10-km resolution and was 60% for 30-km resolution. The predictive accuracy for rainfall position extended to ～150 km from the observed position for both resolutions. Simulated rainfall was most sensitive to CPS, then to PBL schemes, and then to GRS. In general, the Grell （GR） scheme and the Anthes and Kuo （AK） scheme showed a better prediction capability for heavy rainfall than did the Betts-Miller （BM） scheme and the Kain-Fritsch （KF） scheme. The GR scheme also performed well in the 24-h and 12-h precipitation predictions： the parameterized convective rainfall in GR is directly related to synoptic-scale forcing. The models without CPS performed better for rainfall amounts but worse for rainfall position than those with CPS. The MM5 model demonstrated substantial predictive capacity using synoptic-scale initial conditions and lateral boundary data because heavy summer rainfall in Korea occurs in a strong synoptic-scale environment.

关键词： heavy rainfall mesoscale convection mesoscale model evaluation convective parameterization

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Steam activation of Fe-N-C catalyst for advanced power performance of alkaline hydrazine fuel cells

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Journal of Energy Chemistry 2022年第1期31卷 276-285,I0008页

作者： sooan Bae Jihyeon park Yuna Hwang Jin-soo park Jaeyoung Lee Beomgyun jeong Research Center for Materials Analysis Korea Basic Science Institute169-14&Gwahak-roDaejeon 34133Republic of Korea School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology123 Cheomdangwagi-ro.Buk-guGwangju 61005Republic of Korea Department of Green Chemical Engineering Sangmyung University31 Sangmyungdae-gilDongnam-gu.CheonanChungnam Province 31066Republic of Korea Ertl Center for Electrochemistry and Catalysis Gwangju Institute of Science and Technology123 Cheomdangwagi-roBuk-giiGwangju 61005Republic of Korea

Alkaline hydrazine liquid fuel cells(AHFC) have been highlighted in terms of high power performance with non-precious metal *** Fe-N-C is a promising non-Pt electrocatalyst for oxygen reduction reaction(ORR),the surface density of the active site is very low and the catalyst layer should be thick to acquire the necessary number of catalytic active *** this thick catalyst layer,it is important to have an optimum pore structure for effective reactant conveyance to active sites and an interface structure for faster charge ***,we prepare a Fe-N-C catalyst with magnetite particles and hierarchical pore structure by steam *** steam activation process significantly improves the power performance of the AHFC as indicated by the lower IR and activation voltage *** on a systematic characterization,we found that hierarchical pore structures improve the catalyst utilization efficiency of the AHFCs,and magnetite nanoparticles act as surface modifiers to reduce the interracial resistance between the electrode and the ion-exchange membrane.

关键词： Alkaline hydrazine fuel cell Oxygen reduction reaction Electrocatalyst Steam activation Ohmic loss Interfacial resistance Surface modifier

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Adjuncts to colonic cleansing before colonoscopy

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World Journal of Gastroenterology 2014年第11期20卷 2735-2740页

作者： Sanghoon park Yun jeong Lim Department of Internal Medicine KEPCO Medical CenterKEPCO Medical FoundationSeoul 132-703South Korea Department of Internal Medicine Dongguk University Ilsan HospitalGoyang 411-773South Korea

Pre-procedural cleansing of the bowel can maximize the effectiveness and efficiency of ***,efficacy of the current gold standard colonic preparation method-high-volume oral administration of purgative agents 12-24 h prior to the procedure-is limited by several factors,such as patient compliance(due to poor palatability and inconvenience of the dosing regimen)and risks of complications(due to drug interactions or intolerance).Attempts to resolve these limitations have included providing adjunctive agents and methods to promote the colonic cleansing ability of the principal purgative agent,with the aim of lessening unpleasant side effects(such as bloating)and reducing the large ingested volume *** promising adjunctive agents are bisacodyl,magnesium citrate,senna,simethicone,metoclopramide,and prokinetics,and each are being investigated for their *** review provides an up to date summary of the reported investigations into the potencies and weaknesses of the key adjuncts currently being applied in clinic as supplements to the traditional bowel preparation *** the comparative analysis ofthese adjuncts showed that no single agent or method has yet achieved the goal of completely overcoming the limitations of the current gold standard preparation method,they at least provide endoscopists with an array of alternatives to help improve the suboptimal efficacy of the main cleansing solutions when used *** aid in this clinical endeavor,a subjective grade was assigned to each adjunct to indicate its practical *** addition,the systematic review of the currently available agents and methods provides insight into the features of each that may be overcome or exploited to create novel drugs and strategies that may become adopted as effective bowel cleansing adjuncts or alternatives.

关键词： Colonoscopy Cathartics Adjuncts Purgative agents Bowel preparation

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Poly adenosine diphosphate-ribosylation, a promising target for colorectal cancer treatment

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World Journal of Gastrointestinal Oncology 2021年第6期13卷 574-588页

作者： Keun-Yeong jeong Minhee park Research and Development Metimedi PharmaceuticalsIncheon 22006South Korea

The development of colorectal cancer(CRC)can result from changes in a variety of cellular systems within the tumor ***,it is primarily associated with genomic instability that is the gradual accumulation of genetic and epigenetic changes consisting of a characteristic set of mutations crucial for pathways in CRC *** on this background,the potential to focus on poly[adenosine diphosphate(ADP)-ribose]polymerase(PARP)-1 and poly-ADP ribosylation(PARylation)as the main causes of malignant formation of CRC may be *** of the important functions of PARP-1 and PARylation is its deoxyribonucleic acid(DNA)repair function,which plays a pivotal role in the DNA damage response and prevention of DNA damage maintaining the redox homeostasis involved in the regulation of oxidation and ***-1 and PARylation can also alter epigenetic markers and chromatin structure involved in transcriptional regulation for the oncogenes or tumor suppressor genes by remodeling histone and chromatin *** the high importance of these processes in CRC,it can be considered that PARP-1 and PARylation are at the forefront of the pathological changes required for CRC ***,this review addresses the current molecular biological features for understanding the multifactorial function of PARP-1 and PARylation in CRC related to the aforementioned roles;furthermore,it presents a summary of recent approaches with PARP-1 inhibition in non-clinical and clinical studies targeting *** understanding could help embrace the importance of targeting PARP-1 and PARylation in the treatment of CRC,which may present the potential to identify various research topics that can be challenged both nonclinically and clinically.

关键词： Colorectal cancer Poly adenosine diphosphate-ribose polymerase-1 Poly adenosine diphosphate-ribose Poly-adenosine diphosphate ribosylation

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Multidimensional Hybrid Architecture Encapsulating Cobalt Oxide Nanoparticles into Carbon Nanotube Branched Nitrogen-Doped Reduced Graphene Oxide Networks for Lithium–Sulfur Batteries

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Energy & Environmental Materials 2022年第2期5卷 555-564页

作者： jeong Seok Yeon Young Hun Ko Tae Ho park Hyunyoung park Jongsoon Kim Ho Seok park School of Chemical Engineering College of EngineeringSungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Korea Advanced Batteries Research Center Korea Electronics Technology Institute25Saenari-roBundang-guSeongnam-si Gyeonggi-do 13509Korea Department of Energy Science Sungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

Lithium–sulfur batteries(LSBs)are regarded as promising candidates for the next-generation energy storage devices owing to their high-theoretical capacity(1675 mAh g^(−1))and affordable ***,several limitations of LSBs such as the lithium polysulfide shuttle,large volume expansion,and low electrical conductivity of sulfur need to be resolved for practical *** address these limitations,herein,a multidimensional architectured hybrid(Co@CNT/nG),where Co_(3)O_(4) nanoparticles are encapsulated into threedimensional(3D)porous N-doped reduced graphene oxide interconnected with carbon nanotube(CNT)branches,is synthesized through a simple pyrolysis *** synergistic effect achieved through the homogeneously distributed and encapsulated Co_(3)O_(4) nanoparticles,the interconnected CNT branches,and the 3D hierarchical porous structure and N-doping of Co@CNT/nG significantly suppresses the shuttle effect of lithium polysulfides and enhances the conversion redox kinetics for the improved sulfur *** validate this effect through various measurements including symmetric cells,Li_(2)S nucleation,shuttle currents,Tafel slopes,diffusion coefficients,and post-mortem ***,Co@CNT/nG-70S-based LSB cells achieve a high-specific capacity of 1193.1 mAh g^(−1) at 0.1 C and a low capacity decay rate of 0.030%per cycle for 700 cycles at 5 C,delivering a high areal capacity of 5.62 mAh cm^(−2) even with a loading of 6.5 mg cm^(−2).

关键词： graphene/CNT hybrid lithium-sulfur batteries multidimensional architecture nanoparticle encapsulation redox promoter

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Optimal design of V-type ultrasonic motor

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Journal of Central south University 2010年第6期17卷 1247-1250页

作者： jeong S S park C H park T G School of Mechatronics Changwon National UniversityChangwon 641773Korea

V-type ultrasonic linear motor fabricated using a simple punching technique was proposed to utilize as an actuator of small precision *** stator of the motor is composed of a thin elastic body and four ceramics attached to the upper and bottom areas of the *** ceramics have each direction of *** two harmonic voltages with a 90° phase difference are applied to the ceramics,symmetric and anti-symmetric displacements will generate at the tip to produce an elliptical motion.A finite element analysis(ATILA) was conducted to simulate the motion pattern for the contact tip of the *** develop a model that generates the maximum displacement at contact tip,the FEM program was used for various *** addition,an optimal model was chosen by considering the magnitude and shape of the displacement according to changes in *** maximum elliptical displacement is shown by W2L11 model,which has a ratio of ceramic width to length of 1:***,the displacement of the contact tip is reduced by the bucking phenomenon if the ratio is larger than 1:6.

关键词： ultrasonic motor piezo-actuator finite element method optimal design elliptical motion

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