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Journal of Central South University 2014年第2期21卷 646-650页

作者： kim Young-Sear SONG ji-hyun kim Sang-Kyun LEE Sangmin Department of Biomedical Engineering Eulji University Department of Electronic Engineering Inha University Institute for Information and Electronics Research Inha University

A novel approach is proposed for improving adaptive feedback cancellation using a variable step-size affine projection algorithm(VSS-APA) based on global speech absence probability(GSAP).The variable step-size of the proposed VSS-APA is adjusted according to the GSAP of the current *** weight vector of the adaptive filter is updated by the probability of the speech *** performance measure of acoustic feedback cancellation is evaluated using normalized *** results demonstrate that the proposed approach has better performance than the normalized least mean square(NLMS) and the constant step-size affine projection algorithms.

关键词： adaptive feedback cancellation affine projection global speech absence probability(GSAP)

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Variations in microstructure and bending formability of extruded Mg–Al–Zn–Ca–Y–MM alloy with precompression and subsequent annealing treatment conditions

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Journal of Magnesium and Alloys 2022年第9期10卷 2475-2490页

作者： Jong Un Lee Sang-Hoon kim Dong Hee Lee Hyun ji kim Young Min kim Sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Agency for Defense Development Daejeon 34186Republic of Korea Implementation Research Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

In this study, the bending formability of an extruded Mg–9Al–1Zn–0.3Mn–0.9Ca–0.6Y–0.5 MM(AZXWMM91100, wt%) alloy at room temperature is significantly improved through application of a combined precompression and subsequent annealing(PCA) treatment. As the amount of precompression applied along the extrusion direction(ED)(i.e., the total strain) increases from 4% to 6%, the area fraction of ED-oriented grains of the PCA-treated alloy increases, which consequently causes an improvement in its bending formability because these grains accommodate larger tensile strain along the ED during bending. As the temperature of the subsequent annealing treatment increases from 350 ℃ to 450 ℃, both the area fraction of the ED-oriented grains and the average grain size increase, and the residual dislocation density decreases owing to the promotion of boundary migration and occurrence of the recovery process at higher ***, the bending formability of both the 4%-precompressed and the 6%-precompressed samples increases with an increase in the annealing temperature. However, when the precompressed samples are annealed at 300 ℃, their bending formability is lower than that of the extruded alloy because the dislocations formed by precompression remain even after the subsequent annealing at this temperature.

关键词： Magnesium Extrusion Bending Formability Texture

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Language Model Using Differentiable Neural Computer Based on Forget Gate-Based Memory Deallocation

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Computers, Materials & Continua 2021年第7期68卷 537-551页

作者： Donghyun Lee Hosung Park Soonshin Seo Changmin kim Hyunsoo Son Gyujin kim ji-Hwan kim Department of Computer Science and Engineering Sogang UniversitySeoul04107Korea

A differentiable neural computer(DNC)is analogous to the Von Neumann machine with a neural network controller that interacts with an external memory through an attention *** DNC’s offer a generalized method for task-specific deep learning models and have demonstrated reliability with reasoning *** this study,we apply a DNC to a language model(LM)*** LM task is one of the reasoning problems,because it can predict the next word using the previous word ***,memory deallocation is a problem in DNCs as some information unrelated to the input sequence is not allocated and remains in the external memory,which degrades ***,we propose a forget gatebased memory deallocation(FMD)method,which searches for the minimum value of elements in a forget gate-based retention *** forget gatebased retention vector indicates the retention degree of information stored in each external memory *** experiments,we applied our proposed NTM architecture to LM tasks as a task-specific example and to rescoring for speech recognition as a general-purpose *** LM tasks,we evaluated DNC using the Penn Treebank and enwik8 LM *** it does not yield SOTA results in LM tasks,the FMD method exhibits relatively improved performance compared with DNC in terms of *** the speech recognition rescoring tasks,FMD again showed a relative improvement using the LibriSpeech data in terms of word error rate.

关键词： Forget gate-based memory deallocation differentiable neural computer language model forget gate-based retention vector

Impact of Fusobacterium nucleatum in the gastrointestinal tract on natural killer cells

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World Journal of Gastroenterology 2021年第29期27卷 4879-4889页

作者： Yeon ji kim Bu Kyung kim Seun Ja Park Jae Hyun kim Institute of Gastroenterology Kosin University College of MedicineBusan 49267Spain Department of Internal Medicine Kosin University College of MedicineBusan 49267South Korea

BACKGROUND Gut microbial dysbiosis contributes to the development and progression of colorectal cancer(CRC).Natural killer(NK)cells are involved in early defense mechanisms to kill infective pathogens and tumor cells by releasing chemokines and *** better understand the relationship between the gut microbiome and CRC,it was hypothesized here that a high abundance of Fusobacterium nucleatum(***)in the gastrointestinal tract could cause reduced NK cell *** To identify associations between gastrointestinal tract *** levels and NK cell *** In vitro experiments were performed on NK cells treated with ***,Peptostreptococcus anaerobius,and Parvimonas micra to identify the effects of gut microbiome species on NK *** 24 and 48 h of treatment,NK cell counts were *** parallel studies,C57BL/6 mice were given broadspectrum antibiotics in their drinking water to reduce resident gut *** 3 wk,the mice received the various bacterial species or phosphate-buffered saline(PBS)via oral gavage every 2 d for 6 *** the study end,blood samples were acquired to perform NK cell activity assessment and cytokine *** tissues were collected and analyzed via immunohistochemistry(IHC).RESULTS The data show that after 3 wk of broad-spectrum antibiotic treatment,levels of total bacteria and *** were markedly decreased in *** of *** significantly decreased NK cell activity relative to the activities of cells from mice treated with antibiotics only and *** administration of *** decreased the proportion of NK46+cells based on IHC staining and increased the production of interleukin-1βand tumor necrosis factor-α.CONCLUSION High levels of *** in the gastrointestinal tract reduced NK cell activity in mice,and the decrease in NK cell activity might be affected by increased proinflammatory cytokines after *** treatment.

关键词： Fusobacterium nucleatum Natural killer cells Colorectal cancer

Traumatic neuroma of remnant cystic duct mimicking duodenal subepithelial tumor:A case report

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World Journal of Clinical Cases 2020年第17期8卷 3821-3827页

作者： Dong-Hwan kim ji-Ho Park jin-Kyu Cho Jung-Wook Yang Tae-Han kim Sang-Ho Jeong Young-hye kim Young-Joon Lee Soon-Chan Hong Eun-Jung Jung Young-Tae Ju Chi-Young Jeong Ju-Yeon kim Department of Surgery Gyeongsang National University College of MedicineGyeongsang National University HospitalJinju 52727South Korea Department of Pathology Gyeongsang National University College of MedicineGyeongsang National University HospitalJinju 52727South Korea

BACKGROUND Gastrointestinal subepithelial tumors(GSTs),incidentally detected during upper gastrointestinal(GI)endoscopy,may be lesions derived from the GI wall or may be caused by compression from external *** general,traumatic neuroma is a benign nerve tumor that results from postoperative nerve injury,occurring in the bile duct as one of the complications after *** is the first case report demonstrating that neuroma of the cystic duct can be incorrectly perceived as a duodenal subepithelial tumor by compressing the duodenal *** SUMMARY We report the case of a 72-year-old man with traumatic neuroma of the cystic duct after *** tumor was mistaken for a duodenal subepithelial tumor on preoperative upper GI endoscopy and endoscopic ultrasonography due to external compression of the GI *** patient had no symptoms,and his laboratory test results were ***,in a series of follow-up endoscopies,the tumor was found to have grown in size,so it was surgically *** lesion was completely removed by laparoscopic endoscopic cooperative *** patient was discharged on postoperative day 7 without *** Traumatic neuroma of the cystic duct can be mistaken for GSTs in GI endoscopy.

关键词： Case report Neuroma Tumor Endoscopy Laparoscopy Cholecystectomy

Cystic metastasis from a mucinous adenocarcinoma of duodenum mimicking type Ⅱ choledochal cyst: A case report

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World Journal of Gastrointestinal Oncology 2017年第12期9卷 492-496页

作者： Yo Na kim ji Soo Song Department of Pathology Chonbuk National University Medical School Research Institute for Endocrine Sciences Department of Radiology Chonbuk National University Medical School and Hospital Research Institute of Clinical Medicine of Chonbuk National University Biomedical Research Institute of Chonbuk National University Hospital

A 51-year-old male patient was referred to our hospital because of an incidentally detected cystic mass near the common bile duct(CBD). Imaging studies demonstrated a cystic mass that was suspected to communicate with the CBD. Gastroscopy showed irregular mucosal thickening with hyperemic change in the second portion of the duodenum. A type Ⅱ choledochal cyst combined with duodenal malignancy was suspected. The patient underwent surgical resection and the histological diagnosis was mucinous adenocarcinoma of the duodenum with cystic metastasis. Although its incidence is extremely rare, care should be taken to check for other sites of malignancy when a pericholedochal cystic mass is detected.

关键词： Duodenal cancer Choledochal cyst Cystic metastasis Mucinous adenocarcinoma

Phase-controlled synthesis of thermally stable nitrogen-doped carbon supported iron catalysts for highly efficient Fischer-Tropsch synthesis

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Nano Research 2019年第10期12卷 2568-2575页

作者： jin Hee Lee Hack-Keun Lee Dong Hyun Chun Hyunkyung Choi Geun Bae Rhim Min hye Youn Heondo Jeong Shin Wook Kang Jung-ll Yang Heon Jung Chui Sung kim ji Chan Park Clean Fuel Laboratory Korea Institute of Energy ResearchDaejeon 34129Republic of Korea Department of Chemical Engineering University of SeoulSeoul 02504Republic of Korea Advanced Energy and System Technology University of Science and TechnologyDaejeon 34113Republic of Korea Department of Physics Kookmin UniversitySeoul 02707Republic of Korea

Iron-based nan oparticles with un iform and high particle dispersi on,which are supported on carb on structures,have been used for various ***,their preparation still suffers from complicated synthesis involving multiple steps and from the high price of precursors and solve *** the prese nt work,a new carbon en capsulated iron-carbide nano particle supported on n itroge rvdoped porous carbon(Fe5C2@C/NPC)structure was *** was made using a simple solid-state reaction with sequential thermal ***5C2@C/NPC is a highly active and stable catalyst for the high-temperature Fischer-Tropsch synthesis *** showed very high hydrocarbon productivity(4.71 gHc gcat^-1·h^-1)with high CO conversions(up to 96%).

关键词： iron-carbide one-pot synthesis nitrogen-doped graphene Fischer-Tropsch synthesis Mdssbauer spectroscopy

Stable Zn Metal Anodes with Limited Zn-Doping in MgF_(2) Interphase for Fast and Uniformly Ionic Flux

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Nano-Micro Letters 2022年第3期14卷 169-183页

作者： ji Young kim Guicheng Liu Ryanda Enggar Anugrah Ardhi jihun Park Hansung kim Joong Kee Lee Energy Storage Research Center Korea Institute of Science and TechnologyHwarang‑ro 14‑gil 5Seongbuk‑guSeoul 02792Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei‑roSeodaemun‑guSeoul 03722Republic of Korea Department of Physics Dongguk UniversitySeoul 04620Republic of Korea APC Technology 10868 Gangbyeonyeok‑ro‑4‑gilGwangjin‑guSeoul 05116Republic of Korea Department of Energy and Environmental Engineering KIST SchoolKorea University of Science and TechnologyHwarang‑ro 14‑gil 5Seongbuk‑guSeoul 02792Republic of Korea

The practical applications of aqueous Zn metal batteries are currently restricted by the inherent drawbacks of Zn such as the hydrogen evolution reaction,sluggish kinetics,and dendrite *** address these problems,herein,a limitedly Zn-doped MgF_(2)interphase comprising an upper region of pure,porous MgF_(2)and a lower region of gradient Zn-doped MgF_(2)is achieved via radio frequency sputtering *** porous MgF_(2)region is a polar insulator whose high corrosion resistance facilitates the de-solvation of the solvated Zn ions and suppression of hydrogen evolution,resulting in Zn metal electrodes with a low interfacial *** Zn-doped MgF_(2)region facilitates fast transfer kinetics and homogeneous deposition of Zn ions owing to the interfacial polarization between the Zn dopant and MgF_(2)matrix,and the high concentration of the Zn dopant on the surface of the metal substrate as fine ***,a symmetric cell incorporating the proposed Zn metal exhibits low overpotentials of~27.2 and~99.7 mV without Zn dendrites over 250 to 8000 cycles at current densities of 1.0 and 10.0 mA cm−2,*** developed Zn/MnO2 full cell exhibits superior capacity retentions of 97.5%and 84.0%with average Coulombic efficiencies of 99.96%after 1000 and 3000 cycles,respectively.

关键词： Zinc metal battery MgF_(2)layer Limited zinc doping Ion-transfer kinetic Deposition guidance

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Proton pump inhibitors as a risk factor for recurrence of Clostridium-difficile-associated diarrhea

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World Journal of Gastroenterology 2010年第28期16卷 3573-3577页

作者： ji Won kim Kook Lae Lee ji Bong Jeong Byeong Gwan kim Sue Shin Joo Sung kim Hyun Chae Jung In Sung Song Division of Gastroenterology and Hepatology Department of Internal MedicineSeoul National University Boramae Hospital Seoul National University College of Medicine Seoul 156-707South Korea Department of Laboratory Medicine Seoul National University Boramae Hospital Division of Gastroenterology and Hepatology Department of Internal MedicineSeoul National University Hospital Seoul National University College of Medicine Seoul 110-744South Korea

AIM:To investigate the risk factors for Clostridiumdifficile-associated diarrhea(CDAD)recurrence,and its relationship with proton pump inhibitors(PPIs). METHODS:Retrospective data of 125 consecutive hospitalized patients diagnosed with CDAD between January 2006 and December 2007 were collected by medical chart *** data included patient characteristics at baseline,underlying medical disease, antibiotic history before receiving a diagnosis of CDAD, duration of hospital stay,severity of CDAD,concurrenttreatment with PPIs,laboratory parameters,response to CDAD therapy,and recurrence of disease within 90 d of successful *** clinical and laboratory parameters were compared in patients in whom CDAD did or did not recur. RESULTS:Of the 125 patients(mean age,67.6± 13.9 years)that developed CDAD,98(78.4%)did not experience recurrence(non-recurrent group)and 27 (21.6%)experienced one or more recurrences(recurrent group).Prior to the development of CDAD,96% of the 125 patients were prescribed antibiotics,and 56(44.8%)of the patients received *** older than 65 years(P=0.021),feeding via nasogastric tube(NGT)(P=0.045),low serum albumin level(P =0.025),and concurrent use of PPIs(P=0.014) were found to be risk factors for CDAD recurrence by univariate ***,sex,length of hospital stay,duration and type of antibiotics used,severity of disease,leukocyte count and C-reactive protein(CRP) were not associated with risk of CDAD *** multivariate analysis,the important risk factors were advanced age(>65 years,adjusted OR:1.32,95% CI:1.12-3.87,P=0.031),low serum albumin level(< 2.5 g/dL,adjusted OR:1.85,95%CI:1.35-4.91,P= 0.028),and concurrent use of PPIs(adjusted OR:3.48, 95%CI:1.64-7.69,P=0.016). CONCLUSION:Advanced age,serum albumin level< 2.5 g/dL,and concomitant use of PPIs were found to be significant risk factors for CDAD recurrence.

关键词： Clostridium difficile Diarrhea Recurrence Risk factors Proton pump inhibitors

Numerical modeling of sedimentation control scenarios in the approach channel of the Nakdong River Estuary Barrage,South Korea

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International Journal of Sediment Research 2016年第3期31卷 257-263页

作者： Un ji Eun-Kyung Jang Gwonhan kim Hydro Science and Engineering Research Institute Korea Institute of Civil Engineering and Building Technology

The effects of sedimentation reduction at the Nakdong River Estuary Barrage(NREB) in Korea were quantitatively analyzed with respect to different sediment control methods using the calibrated and validated two-dimensional *** countermeasures of sediment dredging,sediment flushing,channel geometry change,and a combination of flushing and channel geometry change were examined for the approach channel of the *** flood event and channel geometries of the 3.8 km section upstream of the NREB surveyed before and after dredging in 2007 were used for modeling *** a result,the half of sediments dredged in 2007 could be eliminated naturally by floods without *** numerical simulation of sediment flushing indicated that the deposition height decreased in the entire simulation section with the minimum and maximum reductions from 0.3 in to1.3 m in deposition *** channel contraction method produced quantitatively the largest amount of sedimentation reduction and sediment flushing and dredging *** reduction by a combination of flushing and channel contraction was up 10%compared to the individual method of channel contraction.

关键词： Channel contraction Nakdong River Estuary Barrage Sediment dredging Sediment flushing Sedimentation reduction