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

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

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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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The H∞ Robust Stability and Performance Conditions for uncertain Robot Manipulators

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 270-272页

作者： Geun Il Song Hae Yeon Park Jung Hoon kim the Department of Electrical Engineering Pohang University of Science and Technology (POSTECH) the Department of Electrical Engineering Pohang University of Science and Technology (POSTECH) the Institute for Convergence Research and Education in Advanced Technology Yonsei University

Dear Editor,H∞This letter develops a new framework for the robust stability and performance conditions as well as the relevant controller synthesis with respect to uncertain robot *** often exist model uncertainties between the nominal model and the real robot manipulator and disturbances. Hence, dealing with their effects plays a crucial role in leading to high tracking performances, as discussed in [1]–[5].

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High-performance MoS_(2)/p^(+)-Si heterojunction field-effect transistors by interface modulation

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Nano Research 2022年第7期15卷 6500-6506页

作者： Yoonsok kim Taeyoung kim Eun Kyu kim Department of Physics and Research Institute of Natural Science Hanyang UniversitySeoul 04763Republic of Korea

Molybdenum disulfide(MoS_(2)),one of transition metal dichalcogenides,is a promising semiconductor material for electronic or optoelectronic devices due to its favorably electronic ***,in metal-oxide semiconductor field-effect transistor(MOSFET)structures using MoS_(2),electrical performances such as mobility and subthreshold swing are suppressed by the interface trap density between the channel and dielectric ***,the electrical stability of such structures is compromised due to interface traps and that can be analyzed such as current hysteresis and transient ***,we demonstrate MoS_(2) heterojunction field-effect transistors(HFET)by applying MoS_(2)/p^(+)-Si heterojunctions and achieve high performance characteristics,including a mobility of 636.19 cm^(2)/(V∙s),a subthreshold swing of 67.4 mV/dec,minimal hysteresis of 0.05 V,and minimized transient ***,the HFET devices with varying the channel length demonstrated degradation of electrical performance with increasing the overlap area of the channel and dielectric *** results regarding MoS_(2)/p^(+)-Si HFETs resulted in the structural optimization of high-performance electronic devices for practical applications.

关键词： molybdenum disulfide(MoS_(2)) transition metal dichalcogenide junction field-effect transistor dielectric layer interface trap

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An advanced integrated framework for moving object tracking

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Journal of Zhejiang university-Science C(Computers and Electronics) 2014年第10期15卷 861-877页

作者： Gwang-Min CHOE Tian-jiang WANG Fang LIU Chun-Hwa CHOE Hyo-Son SO chol-ung PAK School of Computer Science and Technology Huazhong University of Science and Technology School of Computer Science and Technology Kim Il Sung University School of Wireless Engineering Huichon Institute of Technology

This paper first introduces the concept of a geogram that captures richer features to represent the objects. The spatiogram contains some moments upon the coordinates of the pixels corresponding to each bin, while the geogram contains information about the perimeter of grouped regions in addition to features in the *** we consider that a convergence process of mean shift is divided into obvious dynamic and steady states,and introduce a hybrid technique of feature description, to control the convergence process. Also, we propose a spline resampling to control the balance between computational cost and accuracy of particle filtering. Finally, we propose a boosting-refining approach, which is boosting the particles positioned in the ill-posed condition instead of eliminating the ill-posed particles, to refine the particles. It enables the estimation of the object state to obtain high accuracy. Experimental results show that our approach has promising discriminative capability in comparison with the state-of-the-art approaches.

关键词： Geogram Mean shift Hybrid gradient descent algorithm Particle filter Spline resampling Matrix condition number

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Evaluation of the k-nearest neighbor method for forecasting the influent characteristics of wastewater treatment plant

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Frontiers of Environmental Science & Engineering 2016年第2期10卷 299-310页

作者： Minsoo kim Yejin kim Hyosoo kim Wenhua PIAO Changwon kim Department of Civil and Environmental Engineering Pusan National University Busan 609-735 Republic of Korea Department of Civil and Environmental Engineering Catholic University of Pusan Busan 609-757 Republic of Korea EnvironSoft Co. Ltd. #511 Industry-University Co.Bld. Pusan Nationai University Busan 609-735 Republic of Korea

The k-nearest neighbor （k-NN） method was evaluated to predict the influent flow rate and four water qualities, namely chemical oxygen demand （COD）, suspended solid （SS）, total nitrogen （T-N） and total phosphorus （T-P） at a wastewater treatment plant （WWTP）. The search range and approach for determining the number of nearest neighbors （NNs） under dry and wet weather conditions were initially optimized based on the root mean square error （RMSE）. The optimum search range for considering data size was one year. The square root-based （SR） approach was superior to the distance factor-based （DF） approach in determining the appropriate number of NNs. However, the results for both approaches varied slightly depending on the water quality and the weather conditions. The influent flow rate was accurately predicted within one standard deviation of measured values. Influent water qualities were well predicted with the mean absolute percentage error （MAPE） under both wet and dry weather conditions. For the seven-day prediction, the difference in predictive accuracy was less than 5% in dry weather conditions and slightly worse in wet weather conditions. Overall, the k-NN method was verified to be useful for predicting WWTP influent characteristics.

关键词： influent wastewater prediction data-drivenmodel k-nearest neighbor method (k-NN)

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Grasping Force Estimation by sEMG Signals and Arm Posture: Tensor Decomposition Approach

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Journal of Bionic Engineering 2019年第3期16卷 455-467页

作者： Sanghyun kim Joowan kim Mingon kim Seungyeon kim Jaeheung Park Department of Transdisciplinary Studies Seoul National University Suwon 16229 Korea Advanced Institutes of Convergence Technology Suwon 16229 Korea

Grasping force estimation using surface Electromyography (sEMG) has been actively investigated as it can increase the manipulability and dexterity of prosthetic hands and robotic hands. Most of the current studies in this area only focus on finding the relationship between sEMG signals and the grasping force without considering the arm posture. Therefore, regression models are not suitable to predict grasping force in various arm postures. In this paper, a method to predict the grasping force from sEMG signals and various grasping postures is developed. The proposed algorithm uses a tensor algebra to train a multi-factor model relevant to sEMG signals corresponding to various grasping forces and postures of the wrist and forearm in multiple dimensions. The multi-factor model is then decomposed into four independent factor spaces of the grasping force, sEMG signals, wrist posture, and forearm posture. Moreover, when a participant executes a new posture, new factors for the wrist and forearm are interpolated in the factor spaces. Thus, the grasping force with various postures can be predicted by combining these factors. The effectiveness of the proposed method is verified through experiments with ten healthy subjects, demonstrating the higher performance of proposed grasping force prediction method than the previous algorithm.

关键词： surface Electromyography (sEMG) grasping force force estimation tensor decomposition

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Characterization of lattice parameters gradient of Cu(In1-xGax)Se2 absorbing layer in thin-film solar cell by glancing incidence X-ray diffraction technique

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Journal of Materials Science & Technology 2020年第16期47卷 193-201页

作者： Yong-Il kim Ki-Bok kim Miso kim Department of Nano Science University of Science and Technology217GajeongYuseongDaejeon34113Republic of Korea Korea Research Institute of Standards and Science 267GajeongYuseongDaejseon34113Republic of Korea

In or Ga gradients in the Cu(In1-xGax)Se2(CIGS)absorbing layer lead to change the lattice parameters of the absorbing layer,giving rise to the bandgap grading in the absorbing layer which is directly associated with the degree of absorbing ability of the CIGS solar *** tried to characterize the depth profile of the lattice parameters of the CIGS absorbing layer using a glancing incidence X-ray diffraction(GIXRD)technique,and then investigate the bandgap grading of the CIGS absorbing *** the glancing incident angle increased from 0.50 to 5.00°,the a and c lattice parameters of the CIGS absorbing layer gradually decreased from 5.7776(3)to 5.6905(2)?,and 11.3917(3)to 11.2114(2)?,*** depth profile of the lattice parameters as a function of the incident angle was consistent with vertical variation in the compositionof In or Ga with depth in the absorbing *** variation of the lattice parameters was due to the difference between the ionic radius of In and Ga co-occupying at the same crystallographic *** to the results of the depth profile of the refined parameters using GIXRD data,the bandgap of the CIGS absorber layer was graded over a range of 1.222-1.532 *** approach allows to determine the In or Ga gradients in the CIGS absorbing layer,and to nondestructively guess the bandgap depth profile through the refinement of the lattice parameters using GIXRD data on the assumption that the changes of the lattice parameters or unit-cell volume follow a good approximation to Vegard’s law.

关键词： Cu(In1-xGax)Se2 absorbing layer Depth profile Glancing incidence X-ray diffraction technique Bandgap grading Vegard’s law

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Meso-Cenozoic basin evolution in northern Korean Peninsula

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Global Geology 2009年第2期12卷 80-86页

作者： PAK Hyon Uk LYANG To Jun LIU Yongjiang HYON Yun Su kim Gyong chol Institute of Geology State Academy of Science Pyongyang DPR of Korea Department of Geology Kim ll Song University Pyongyang DPR of Korea College of Earth Sciences Jilin University Changchun 130061 China

In the Korean Peninsula the Meso-Cenozoic basins were mainly formed due to fault block and block movement. The Mesozoic fracture structures correspond basically to modem large rivers in direction. Such faults were usually developed to rift and formed lake-type tectonic basin, such as the Amrokgang-, Taedonggang-, Ryesonggang-, Hochongang-, Jangphari-, Susongchon-, Pujon-, and Nampho basins. The Mesozoic strata are considered to be divided into the Lower Jurassic Taedong System, Upper Jurassic Jasong System, Upper Jurassic-early Lower Cretaceous Taebo System, and the Upper Cretaceous-Paleocene （ Chonjaebong, Hongwon, Jaedok Series）. The Cenozoic block movement succeeded the Mesozoic fault block movement. The Kilju-Myongchon Graben and Tumangang Basin, etc, are the basins related to the fault zones developed from the Oligocene to Miocene. In addition, the Tertiary basins were formed in many areas in the Miocene （e. g. Sinhung, Oro, Hamhung, Yonghung, Anbyon, cholwon, etc）. The Cenozoic sedimentation occurred mainly from the late Oligocene to Miocene. The Kilju-Myongchon Graben was the fore deep connected to the sea and the basins inclined in the Chugaryong Fault Zone are intramountain basins. Therefore, coal-beating beds and clastic rocks in the intramountain basins and rare marine strata and terrigenous clastic rocks are main sedimentary sequences in the Cenozoic.

关键词： Korean Peninsula Meso-Cenozoic basins tectonic movement

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Silicone-coated polyimide films deposited by surface dielectric barrier discharges

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Plasma Science and Technology 2019年第1期21卷 93-99页

作者： Junggil kim Yunjung kim Sangjin kim Guangsup CHO Department of Electrical and Biological Physics Kwangwoon University

Hybrid dielectric barrier discharges are investigated for plasma generated on the surface of a dielectric layer, where two conducting electrodes of high voltage and ground are formulated on the upper and bottom surfaces. Using a flexible thin polyimide-film of a thickness ranging from 25 to 125 μm, a plasma is generated with a voltage of about 1 kV and a frequency of 40 ***, the surface of the dielectric layer was etched through a chemical reaction involving plasma oxygen radical species, and thus the polyimide films failed readily, resulting in dielectric breakdown within short operating time ranging from a few minutes to several tens of minutes,based on the film thicknesses of 25 μm and 125 μm, respectively. These plasma erosions were prevented by coating the polyimide surface with a 25 μm thick silicone paste. The siliconecoated film surface was then reinforced remarkably against plasma erosion as the organic polymer was vulnerable to chemical reaction of the plasma species, while the inorganic silicone exhibited a high chemical resistance against plasma erosion.

关键词： plasma discharge atmospheric pressure nonthermal plasma polyimide film plasma erosion

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