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Spectrum of mucin-producing neoplastic conditions of the abdomen and pelvis:Cross-sectional imaging evaluation

World Journal of Gastroenterology 2011年第43期17卷 4757-4771页

作者： Nam Kyung Lee Suk kim Hyun Sung kim tae Yong Jeon Gwang Ha kim Dong Uk kim Do Youn Park tae un kim Dae Hwan Kang Department of Radiology Pusan National University Hospital Medical Research Institute Pusan National University School of Medicine Pusan National university Department of Surgery Pusan National University Hospital Department of Internal Medicine Pusan National University Hospital Department of Pathology Pusan National University Hospital Department of Radiology Yangsan Pusan National University Hospital Medical Research Institute Pusan National University School of Medicine Department of Internal Medicine Yangsan Pusan National University Hospital

Various mucin-producing neoplasms originate in different abdominal and pelvic *** neoplasms differ from non-mucinous neoplasms because of the differences in clinical outcome and imaging *** carcinoma,in which at least 50%of the tumor is composed of large pools of extracellular mucin and columns of malignant cells,is associated with a worse *** ring cell carcinoma is characterized by large intracytoplasmic mucin vacuoles that expand in the malignant cells with the nucleus displaced to the *** prognosis is also generally *** contrast,intraductal papillary mucinous neoplasm of the bile duct and pancreas,which is characterized by proliferation of ductal epithelium and variable mucin production,has a better prognosis than other malignancies in the pancreaticobiliary *** modalities play a critical role in differentiating mucinous from non-mucinous *** to high water content,mucin has a similar appearance to water on ultrasound(US) ,computed tomography(CT) ,and magnetic resonance imaging,except when thick and proteinaceous,and then it tends to be hypoechoic with fine internal echoes or have complex echogenicity on US,hyperdense on CT,and hyperintense on T1and hypointense on T2-weighted images,compared to ***,knowledge of characteristic mucin imaging features is helpful to diagnose various mucinproducing neoplastic conditions and to facilitate appropriate treatment.

关键词： Mucin Neoplasm Ultrasound Computed tomography Magnetic resonance Abdomen and pelvis

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Diffusion-weighted imaging of biliopancreatic disorders:Correlation with conventional magnetic resonance imaging

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World Journal of Gastroenterology 2012年第31期18卷 4102-4117页

作者： Nam Kyung Lee Suk kim Gwang Ha kim Dong Uk kim Hyung Il Seo tae un kim Dae Hwan Kang Ho Jin Jang Department of Radiology Biomedical Research InstitutePusan National University HospitalSchool of MedicinePusan National UniversityBusan 602-739South Korea Department of Internal Medicine Biomedical Research InstitutePusan National University HospitalSchool of MedicinePusan National UniversityBusan 602-739South Korea Department of Surgery Biomedical Research InstitutePusan National University HospitalSchool of MedicinePusan National UniversityBusan 602-739South Korea Department of Radiology Yangsan Pusan National University HospitalSchool of MedicinePusan National UniversityYangsan 626-770South Korea Department of Internal Medicine Yangsan Pusan National University HospitalSchool of MedicinePusan National UniversityYangsan 626-770South Korea Department of Obstetrics and Gynecology Armed Forces Seoul HospitalSeoul 110-200South Korea

Diffusion-weighted magnetic resonance imaging(DWI)is a well established method for the evaluation of intracranial diseases,such as acute *** for extracranial application is more difficult due to physiological motion artifacts and the heterogeneous composition of the ***,thanks to the newer technical development of DWI,DWI has become increasingly used over the past few years in extracranial organs including the abdomen and *** previous studies of DWI have been limited to the evaluation of diffuse parenchymal abnormalities and focal lesions in abdominal organs,whereas there are few studies about DWI for the evaluation of the biliopancreatic *** further studies are needed to determine its performance in evaluating bile duct,gallbladder and pancreas diseases,DWI has potential in the assessment of the functional information on the biliopancreatic tract concerning the status of tissue cellularity,because increased cellularity is associated with impeded diffusion,as indicated by a reduction in the apparent diffusion *** detection of malignant lesions and their differentiation from benign tumor-like lesions in the biliopancreatic tract could be improved using DWI in conjunction with findings obtained with conventional magnetic resonance ***,DWI can be useful for the assessment of the biliopancreatic tract in patients with renal impairment because contrast-enhanced computed tomography or magnetic resonance scans should be avoided in these patients.

关键词： Magnetic resonance imaging Diffusion-weighted imaging Biliary tract Gallbladder Pancreas

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Rosai-Dorfman disease in the spleen of a pediatric patient:A case report

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World Journal of Clinical Cases 2021年第21期9卷 6032-6040页

作者： Hwaseong Ryu Jae-Yeon Hwang Yong-Woo kim tae-un kim Joo-Yeon Jang Su-Eun Park Eu-Jeen Yang Dong-Hoon Shin Department of Radiology Pusan National University Yangsan HospitalYangsan 50612South Korea Department of Pediatrics Pusan National University Children’s HospitalYangsan 50612South Korea Department of Pathology Pusan National University Yangsan HospitalYangsan 50612South Korea

BACKGROunD Rosai–Dorfman disease(RDD)is a rare histiocytic proliferation of unknown etiology commonly found in children and *** common manifestation of RDD is massive and painless bilateral cervical lymphadenopathy with extranodal *** extranodal involvement in RDD is common,the spleen is an infrequent site of *** SUMMARY We report a 10-mo-old female infant with RDD presenting multiple splenic masses without cervical *** had fever,and blood tests showed leukocytosis,anemia,and elevated erythrocyte sedimentation rate and Creactive ***,computed tomography,and magnetic resonance images demonstrated multiple splenic *** antibiotic therapy,her symptoms were not *** underwent diagnostic splenectomy and was discharged with *** In pediatric patients with refractory infectious symptoms or hematological abnormalities,clinicians should suspect RDD,even in patients without significant lymphadenopathy.

关键词： Rosai–Dorfman disease Sinus histiocytosis with massive lymphadenopathy Ultrasonography Computed tomography Magnetic resonance imaging Case report

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Therapeutic efficacy and stent patency of transhepatic portal vein stenting after surgery

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World Journal of Gastroenterology 2016年第44期22卷 9822-9828页

作者： ung Bae Jeon Chang Won kim tae un kim Ki Seok Choo Joo Yeon Jang Kyung Jin Nam Chong Woo Chu Je Ho Ryu Department of Radiology Pusan National University Yangsan Hospital Department of Radiology Medical Research Institute Pusan National University School of Medicine and Research Institute for Convergence of Biomedical Science and Technology Pusan National University Hospital Department of Surgery Pusan National University Yangsan Hospital

AIM To evaluate portal vein(PV) stenosis and stent patency after hepatobiliary and pancreatic surgery, using abdominal computed tomography(CT).METHODS Percutaneous portal venous stenting was attempted in 22 patients with significant PV stenosis(> 50%)-after hepatobiliary or pancreatic surgery- diagnosed by abdominal CT. Stents were placed in various stenotic lesions after percutaneous transhepatic portography. Pressure gradient across the stenotic segment was measured in 14 patients. Stents were placed when the pressure gradient across the stenotic segment was > 5 mm Hg or PV stenosis was > 50%, as observed on transhepatic portography. Patients underwent followup abdominal CT and technical and clinical success, complications, and stent patency were *** Stent placement was successful in 21 patients(technical success rate: 95.5%). Stents were positioned through the main PV and superior mesenteric vein(n = 13), main PV(n = 2), right and main PV(n = 1), left and main PV(n = 4), or main PV and splenic vein(n = 1). Patients showed no complications after stent placement. The time between procedure and final follow-up CT was 41-761 d(mean: 374.5 d). Twenty stents remained patent during the entire follow-up. Stent obstruction-caused by invasion of the PV stent by a recurrent tumor- was observed in 1 patient in a follow-up CT performed after 155 d after the procedure. The cumulative stent patency rate was 95.7%. Small in-stent low-density areas were found in 11(55%) patients; however, during successive follow-up CT, the extent of these areas had *** Percutaneous transhepatic stent placement can be safe and effective in cases of PV stenosis after hepatobiliary and pancreatic surgery. Stents show excellent patency in follow-up abdominal CT, despite development of small in-stent low-density areas.

关键词： Liver Vein Stent Computed tomography Surveillance Efficace

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Wearable Triboelectric Nanogenerators Based on Printed Polyvinylidene Fluoride Films Incorporated with Cobalt-Based Metal-Organic Framework for Self-Powered Mobile Electronics

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Energy & Environmental Materials 2024年第4期7卷 396-403页

作者： Myeong-Hyeon kim Sang-Joon Park tae-Jun Ha Department of Electronic Materials Engineering Kwangwoon University

In this study,wearable triboelectric nanogenerators comprising bar-printed polyvinylidene fluoride (PVDF) films incorporated with cobalt-based metalorganic framework (Co-MOF) were *** enhanced output performance of the TENCs was attributed to the phase transition of PVDF from α-crystals to β-crystals,as facilitated by the incorporation of the MOF.

关键词： bar printing phase transition polyvinylidene fluoride incorporated with cobalt-based metal–organic framework self-powered mobile electronics wearable triboelectric nanogenerators

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ROS-induced metabolic reprogramming to one-carbon metabolism and S-adenosylmethionine-mediated epigenetic modification in IL-10-producing B cells for the resolution of pneumonia

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Cellular & Molecular Immunology 2024年第2期21卷 203-204页

作者： Sujin Lee tae Jin kim Department of Immunology Sungkyunkwan University School of MedicineSuwon16419Republic of Korea

B cells have an essential immunoregulatory function,which is mediated by the secretion of IL-10 and TGFβand interaction with activated CD4^(+)T *** antibody-independent function of B cells contributes to ameliorating autoimmune diseases or infection-induced tissue *** this Cellular and Molecular Immunology issue,Fu et *** that regulatory B(Breg)cells play a critical role in resolving Pseudomonas aeruginosa-induced pneumonia[1].

关键词： metabolism pneumonia Immunology

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Ag-GST/HfO_(x)-based unidirectional threshold switching selector with low leakage current and threshold voltage distribution for high-density cross-point arrays

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Rare Metals 2024年第1期43卷 280-288页

作者： Kyoung-Joung Yoo Dae-Yun Kang Nahyun kim Ho-Jin Lee Ta-Hyeong kim taeho kim tae Geun kim School of Electrical Engineering Korea UniversitySeoul 02841Republic of Korea

The use of electrochemical-metallization-based volatile threshold switching selectors in cross-point arrays has been widely explored owing to their high on-off ratios and simple ***,these devices are unsuitable for cross-point architectures because of the difficulty in controlling the random filament formation that results in large fluctuations in the threshold voltage during *** this study,we investigated the unidirectional threshold transition characteristics associated with an Ag/GST/HfO_(x)/Pt-based bilayer selector and demonstrated the occurrence of a low leakage current(unneling *** stacking a bilayer selector with NiO_(x)based resistive random-access memory,the leakage and programming currents of the device could be significantly *** the crossbar array configuration,we performed equivalent circuit analysis of a one-selector oneresistor(1S1R) devices and estimated the optimal array size to demonstrate the applicability of the proposed *** maximum acceptable crossbar array size of the 1S1R device with the Ag/GST/HfO_(x)/Pt/Ti/NiO_(x)/Pt structure was 5.29×10^(14)(N^(2),N=2.3×10^(7)).

关键词： Selector device Tunneling barrier Threshold switching Sputtering 1S1R Cross-point array

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Two-stage dynamic recrystallization and texture evolution in Al-7Mg alloy during hot torsion

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1900-1911页

作者： Kwang tae Son Chang Hee Cho Myoung Gyun kim Ji Woon Lee School of Mechanical Industrialand Manufacturing EngineeringOregon State UniversityCorvallis OR 97331USA Department of Materials Science Engineering Northwestern UniversityEvanston IL 60208USA Research Institute of Industrial Science and Technology(RIST) Pohang 37673Rep.of Korea Division of Advanced Materials Engineering Kongju National UniversityCheonan 31080Rep.of Korea Center for Advanced Materials and Parts of Powders Kongju National UniversityCheonan 31080Rep.of Korea

Hot torsion tests were performed on the Al-7Mg alloy at the temperature ranging from 300 to 500℃ and strain rates between 0.05 and 5 s^(-1) to explore the progressive dynamic recrystallization(DRX)and texture *** DRX behavior of the alloy manifested two distinct stages:Stage 1 at strain of≤2 and Stage 2 at strains of≥*** Stage 1,there was a slight increase in the DRXed grain fraction(X_(DRX))with predominance of discontinuous DRX(DDRX),followed by a modest change in X_(DRX) until the transition to Stage *** 2 was marked by an accelerated rate of DRX,culminating in a substantial final X_(DRX) of~*** backscattered diffraction(EBSD)analysis on a sample in Stage 2 revealed that continuous DRX(CDRX)predominantly occurred within the(121)[001]grains,whereas the(111)[110]grains underwent a geometric DRX(GDRX)evolution without a noticeable sub-grain ***,a modified Avrami’s DRX kinetics model was utilized to predict the microstructural refinement in the Al-7Mg alloy during the DRX *** this kinetics model did not accurately capture the DDRX behavior in Stage 1,it effectively simulated the DRX rate in Stage *** texture index was employed to assess the evolution of the texture isotropy during hot-torsion test,demonstrating significant improvement(>75%)in texture randomness before the commencement of Stage *** initial texture evolution is attributed to the rotation of parent grains and the substructure evolution,rather than to an increase in X_(DRX).

关键词： Al-7Mg alloys hot deformation hot torsion tests dynamic recrystazlliation microstructure texture

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A Framework for Enhancing Privacy and Anonymity in Blockchain-Enabled IoT Devices

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Computers, Materials & Continua 2024年第3期78卷 4263-4282页

作者： Muhammad Saad Muhammad Raheel Bhutta Jongik kim tae-Sun Chung Department of Artificial Intelligence Ajou UniversitySuwon443-749Korea Department of Electrical and Computer Engineering University of Utah Asia CampusIncheon21985Korea Department of Artificial Intelligence Chungnam National UniversityDaejeon34134Korea

With the increase in IoT(Internet of Things)devices comes an inherent challenge of *** the world today,privacy is the prime concern of every *** one’s privacy and keeping anonymity throughout the system is a desired functionality that does not come without inevitable trade-offs like scalability and increased complexity and is always exceedingly difficult to *** challenge is keeping confidentiality and continuing to make the person innominate throughout the *** address this,we present our proposed architecture where we manage IoT devices using blockchain *** proposed architecture works on and off blockchain integrated with the closed-circuit television(CCTV)security camera fixed at the rental *** this framework,the CCTV security camera feed is redirected towards the owner and renter based on the smart contract *** entity(owner or renter)can see the CCTV security camera feed at one *** is no third-party dependence except for the CCTV security camera deployment *** contributions include the proposition of framework architecture,a novel smart contract algorithm,and the modification to the ring signatures leveraging an existing cryptographic *** are made based on different systems’security and key management *** an empirical study,our proposed algorithm performed better in key generation,proof generation,and verification *** comparing similar existing schemes,we have shown the proposed architectures’*** now,we have developed this system for a specific area in the real ***,this system is scalable and applicable to other areas like healthcare monitoring systems,which is part of our future work.

关键词： Privacy anonymity blockchain IoT smart contracts

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Tribological behavior of TiN,AlTiN,and AlTiCrN coatings in atmospheric and vacuum environments

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Friction 2024年第11期12卷 2611-2626页

作者： Youn-Hoo HWANG Kuk-Jin SEO tae-Hyeong kim You Jin MIN Yuzhen LIU Dae-Eun kim Department of Mechanical Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Mechatronics and Energy Engineering Ningbo Tech UniversityNingbo 315211China

In this study,the tribological characteristics of TiN,AlTiN,and AlTiCrN coatings sliding against a SUS420J1 stainless steel pin were investigated in atmospheric and vacuum *** coatings were deposited on SUS440C substrates using the arc-physical vapor deposition *** friction and wear behavior of the coatings were evaluated based on the systematic analyses of the friction coefficient data as well as the physical and chemical state of the wear *** results revealed that the friction coefficients of the SUS440C specimen and AlTiCrN coatings increased,whereas those of the TiN and AlTiN coatings decreased when the environment was changed from atmospheric to *** was confirmed that the formation of an oxide layer and adsorption of oxides on the surface were dominant factors that influenced the tribological behavior in the atmospheric *** the other hand,the compatibility,oxidation inhibition,and droplets of the surface mainly affected the frictional characteristics in the vacuum *** results of this work are expected to aid in the selection of proper coating materials for tribological systems operating in a vacuum.

关键词： friction wear coating vacuum TiN

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