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Synthesis and electrochemical properties of dual doped spinels LiNi_xAl_yMn_(2-x-y)O_4 via facile novel chelated sol–gel method as possible cathode material for lithium rechargeable batteries

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Journal of Energy Chemistry 2017年第1期26卷 101-114页

作者： R.Thirunakaran gil hwan lew Won-Sub Yoon CSIR-Central Electrochemical Research Institute Sungkyunkwan University Department of Energy Science

LiMnOand LiNiAlyMnO（x= 0.50;y = 0.05-0.50） powders have been synthesized via facile solgel method using Behenic acid as active cheiating *** synthesized samples are subjected to physical characterizations such as thermo gravimetric analysis（TG/DTA）,X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FT-IR）,field-emission scanning electron microscopy（FESEM）,transmission electron microscopy（TEM） and electrochemical studies viz.,galvanostatic cycling properties,electrochemical impedance spectroscopy（EIS） and differential capacity curves（dQ/dE）.Finger print XRD patterns of LiMnOand LiNiAlMnOfortify the high degree of crystallinity with better phase *** images of the undoped pristine spinel illustrate uniform spherical grains surface morphology with an average particle size of 0.5 μm while Ni doped particles depict the spherical grains growth（50nm） with ice-cube surface *** images of the spinel LiMnOshows the uniform spherical morphology with particle size of（100 nm） while low level of Al-doping spinel（LiNio.5Alo.05Mn1.45O4） displaying cloudy particles with agglomerated particles of（50nm）.The LiMnOsamples calcined at 850℃ deliver the discharge capacity of 130 mAh/g in the first cycle corresponds to 94%coiumbic efficiency with capacity fade of 1.5 mAh/g/cycle over the investigated 10 *** all four dopant compositions investigated,LiNiAlMnOdelivers the maximum discharge capacity of 126 mAh/g during the first cycle and shows the stable cycling performance with low capacity fade of 1 mAh/g/cycle（capacity retention of 92%） over the investigated 10 *** impedance studies of spinel LiMnOand LiNiAlMnOdepict the high and low real polarization of 1562 and 1100 Ω.

关键词： Multi-doping Sol–gel method Behenic acid Differential capacity Spinel cathode

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Sol-Gel Synthesis Using Novel Chelating Agent and Electrochemical Characterization of Binary Doped LiMn₂O₄ Spinel as Cathode Material for Lithium Rechargeable Batteries

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World Journal of Nano Science and Engineering 2016年第1期6卷 1-19页

作者： Ramasamy Thirunakaran gil hwan lew Won-Sub Yoon CSIR-Central Electrochemical Research Institute Karaikudi India Department of Energy Science Sungkyunkwan University Suwon Republic of Korea

LiMn2O4 and LiCuxCryMn2-x-yO4 (x = 0.50;y = 0.05 - 0.50) powders have been synthesized via sol-gel method for the first time using Myristic acid as chelating agent. The synthesized samples have been taken to physical and electrochemical characterization such as thermo gravimetric analysis (TG/DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and electrochemical characterization viz., electrochemical galvanostatic cycling studies, electrochemical impedance spectroscopy (EIS) and differential capacity curves (dQ/dE). XRD patterns of LiMn2O4 and LiCuxCryMn2-x-yO4 confirm high degree of crystallinity with good phase purity. FESEM image of undoped pristine spinel lucidly depicts cauliflower morphology with good agglomerated particle size of 50 nm while 0.5-Cu doped samples depict the pebbles morphology. TEM images of the spinel LiMn2O4 and LiCu0.5Cr0.05Mn1.45O4 authenticate that all the synthesized particles via sol-gel method are nano-sized (100 nm) with spherical surface and cloudy particles morphology. The LiMn2O4 samples calcined at 850℃ deliver the high discharge capacity of 130 mA·h/g with cathodic efficiency of 88% corresponds to 94% columbic efficiency in the first cycle. Among all four compositions studied, LiCu0.5Cr0.05Mn1.45O4 delivers 124 mA·h/g during the first cycle and shows stable performance with a low capacity fade of 1.1 mA·h/g cycle over the investigated 10 cycles.

关键词： Multi-Doping Sol-Gel Method Myristic Acid Differential Capacity Spinel Cathode

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Carbon nanotube-reinforced elastomeric nanocomposites: a review

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International Journal of Smart and Nano Materials 2015年第4期6卷 211-238页

作者： Bismark Mensah Han gil Kim Jong-hwan Lee Sivaram Arepalli Changwoon Nah BK21 Haptic Polymer Composite Research Team Department of Polymer-Nano Science and TechnologyChonbuk National UniversityJeonju 561-756Republic of Korea Nano Science Consultants LLC HamptonVA 23666-6701USA

This review is focused on carbon nanotube(CNT)-elastomeric polymer nanocom-posites,which have attracted industrial and academic interest over the years due to their enhanced *** factors notably CNT type,surface modifica-tion,dispersion of CNT,and processing techniques that affect the physical properties of CNT-elastomeric polymer nanocomposites are reviewed,and several key physical properties,including tensile,electrical,and thermal properties,were also included in this *** of the key challenges that undermine the effectiveness of CNTs and their composites with elastomeric polymers,and the potential applications of CNT-elastomeric composites are also captured.

关键词： carbon nanotubes elastomeric polymers nanocomposites surface mod-ification physical properties

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Salvage living donor liver transplantation for recurrent hepatocellular carcinoma after prior laparoscopic hepatectomy

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Hepatobiliary & Pancreatic Diseases International 2018年第5期17卷 473-476页

作者： Seok-hwan Kim Ki-Hun Kim Tae-Yong Ha Dong-hwan Jung gil-Chun Park Sung-Gyu Lee Division of Hepatobiliary Surgery and Liver Transplantation Department of SurgeryAsan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea Department of Surgery Chungnam National University HospitalChungnam National University School of MedicineDaejeonKorea

Salvage liver transplantation(LT)is frequently performed on patients who experience recurrent hepatocellular carcinoma(HCC)after primary hepatectomy for HCC[1,2].The main concern in these patients is the technical feasibility of salvage LT,especially as prior hepatectomy may result in heavy adhesions[3,4].Salvage living donor LT(LDLT)is a more demanding procedure than salvage deceased donor LT(DDLT)using an entire donor graft with a long vascular pedicle[5,6].Because less than optimal dissection of perihepatic adhesions could result in uncontrollable pinpoint bleedings at the dissection surface[1,5],many transplant surgeons avoid performing salvage *** invasive laparoscopic hepatectomy(LH)results in fewer intraperitoneal adhesions than the open method,reducing the difficulty of surgical dissection during future LT[7–10].To date,however,no study has compared salvage LDLT for recurrent HCC after LH to that after open hepatectomy(OH).

关键词： LDLT experience recurrent

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Long Short-Term Memory Recurrent Neural Network-Based Acoustic Model Using Connectionist Temporal Classification on a Large-Scale Training Corpus

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China Communications 2017年第9期14卷 23-31页

作者： Donghyun Lee Minkyu Lim Hosung Park Yoseb Kang Jeong-Sik Park gil-Jin Jang Ji-hwan Kim Department of Computer Science and Engineering Sogang University Department of Information and Communication Engineering Yeungnam University School of Electronics Engineering Kyungpook National University

A Long Short-Term Memory(LSTM) Recurrent Neural Network(RNN) has driven tremendous improvements on an acoustic model based on Gaussian Mixture Model(GMM). However, these models based on a hybrid method require a forced aligned Hidden Markov Model(HMM) state sequence obtained from the GMM-based acoustic model. Therefore, it requires a long computation time for training both the GMM-based acoustic model and a deep learning-based acoustic model. In order to solve this problem, an acoustic model using CTC algorithm is proposed. CTC algorithm does not require the GMM-based acoustic model because it does not use the forced aligned HMM state sequence. However, previous works on a LSTM RNN-based acoustic model using CTC used a small-scale training corpus. In this paper, the LSTM RNN-based acoustic model using CTC is trained on a large-scale training corpus and its performance is evaluated. The implemented acoustic model has a performance of 6.18% and 15.01% in terms of Word Error Rate(WER) for clean speech and noisy speech, respectively. This is similar to a performance of the acoustic model based on the hybrid method.

关键词： acoustic model connectionisttemporal classification large-scale trainingcorpus long short-term memory recurrentneural network

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冷加工过程中Zr-1Nb板材组织演化研究(英文)

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稀有金属材料与工程 2013年第4期42卷 667-672页

作者：刘彦章 Hyun-gil Kim Jeong-Yong Park Yong-hwan Jeong 深圳中广核工程设计有限公司广东深圳518057 Korea Atomic Energy Research Institute Daejeon 305-353Republic of Korea

对热轧的Zr-1Nb板材进行了不同变形量的冷加工,利用背散射电子衍射(EBSD)以及透射电子显微镜(TEM)研究了冷加工及热处理对其组织的影响。结果表明,随着冷加工变形量从30%增加到70%,晶粒尺寸逐渐从双态分布变为均匀分布。各种变形下的织... 详细信息

对热轧的Zr-1Nb板材进行了不同变形量的冷加工,利用背散射电子衍射(EBSD)以及透射电子显微镜(TEM)研究了冷加工及热处理对其组织的影响。结果表明,随着冷加工变形量从30%增加到70%,晶粒尺寸逐渐从双态分布变为均匀分布。各种变形下的织构主要为(0001),且随着变形道次的增加强度逐渐增大。

关键词： Zr-1Nb 冷轧和退火组织演化背散射电子衍射

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Effect of tellurium on the microstructure and mechanical properties of Fe-14Cr oxide-dispersion-strengthened steels produced by additive manufacturing

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Journal of Materials Science & Technology 2021年第36期95卷 114-126页

作者： Barton Mensah Arkhurst Jee hwan Bae Min Young Na Hye Jung Chang Hyun gil Kim Il Hyun Kim Ho Jin Ryu Jeoung Han Kim School of Materials Science and Engineering University of New South Wales SydneyNSW 2052Australia Advanced Analysis Center Korea Institute of Science and Technology SeoulSeongbuk-guRepublic of Korea LWR Fuel Technology Division Korea Atomic Energy Research InstituteDaejeonYuseong-guRepublic of Korea Department of Nuclear and Quantum Engineering KAISTDaejeonYuseong-guRepublic of Korea Department of Materials Science&Engineering Hanbat National UniversityRepublic of Korea

Conventionally,Te has primarily been used to improve the machinability of steel and its *** this work,Te was used to refine the grains of an oxide-dispersion-strengthened(ODS)steel produced by additive manufacturing(AM)with fixed processing *** of Te to the raw powder produced an ODS steel with a fine-grained microstructure,in contrast to the ODS steel manufactured without ***,the addition of Te resulted in superior yield strength and ultimate tensile strength,which was attributed to the combined effects of grain refinement and the finer nanoparticles(NPs)composed of Terich composite NPs and Cr-rich *** the first time,the AM technique was used to obtain grain and nanoparticle sizes of~3.4μm and 6 nm,respectively,from the Te-added ODS steel.

关键词： Additive manufacturing Directed energy deposition Oxide-dispersion-strengthened steel Nanoparticle Tellurium

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Sequential transcatheter arterial chemoembolization and portal vein embolization before right hemihepatectomy in patients with hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2020年第3期19卷 244-251页

作者： gil Chun Park Sung Gyu Lee Young In Yoon Kyu Bo Sung Gi Young Ko Dong Il Gwon Dong hwan Jung Yong Kyu Jung Division of Hepatobiliary Surgery and Liver Transplantation Department of SurgeryAsan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea Department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea

Background:Recent studies showed that sequential selective transcatheter arterial chemoembolization(TACE)and portal vein embolization(PVE)provided better future liver remnant(FLR)regeneration rate and disease-free survival following surgery compared with PVE *** present study aimed to clarify whether preoperative sequential TACE and PVE before right hemihepatectomy can reduce postoperative hepatocellular carcinoma(HCC)recurrence and improve long-term disease-free and overall ***:Recurrence and survival outcomes were retrospectively evaluated in 205 patients with HCC who underwent right hemihepatectomy by a single surgeon from November 1993 to November *** were divided into four groups according to the procedure performed before the surgery:sequential TACE and PVE(TACE-PVE),PVE-only,TACE-only,or na?ve control *** baseline patient and tumor characteristics,postoperative outcomes,recurrence-free survival and overall survival were ***:Baseline patient and tumor characteristics upon diagnosis were similar in all four groups,while sequential TACE and PVE were well *** TACE-PVE group had a higher mean increase in percentage FLR volume compared with that of the PVE-only group(17.46%±6.63%vs.12.14%±5.93%;P=0.001).The TACE-PVE group had significantly better overall and disease-free survival rates compared with the other groups(both P<0.001).Conclusions:Sequential TACE and PVE prior to surgery can be an effective therapeutic strategy for patients with HCC scheduled for major hepatic *** active application of preoperative sequential TACE and PVE for HCC would allow more patients with marginal FLR volume to become candidates for major hepatic resection by promoting compensatory FLR hypertrophy without the deterioration of basal hepatic functional reserve or tumor progression.

关键词： Sequential selective transcatheter Arterial chemoembolization Portal vein embolization Hepatocellular carcinoma Future liver remnant

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Portal vein stenting as a significant risk factor for biliary stricture in adult living donor liver transplantation

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Hepatobiliary & Pancreatic Diseases International 2016年第5期15卷 480-486页

作者： Min-Ho Shin Deok-Bog Moon Sung-Gyu Lee Shin hwang Ki-Hun Kim Chul-Soo Ahn Tae-Yong Ha Gi-Won Song Dong-hwan Jung gil-Chun Park Young-In Yun Wan-Jun Kim Woo-Hyoung Kang Seok-hwan Kim Gi-Young Ko Division of Hepatobiliary Surgery and Liver Transplantation Department of SurgeryAsan Medical CenterUniversity of Ulsan College of Medicine88 0lympic-ro 43 gilSongpa-guSeoul 05505Korea Department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of Medicine88 0lympic-ro 43 gilSongpa-guSeoul 05505Korea

BACKGROUND: Although perioperative portal vein (PV) stent implantation is an effective treatment for steno-occlusive disease in adult living donor liver transplantation (LDLT) re-cipients, we experienced high incidence of biliary anastomotic strictures (BAS) after PV stenting. In this study, we sought to clarify the relation between BAS and PV stenting and to suggest the possible mechanism of BAS and measures to reduce its in-cidence. METHODS: We retrospectively analyzed 44 LDLT recipients who underwent PV stent implantation across the line of PV anastomosis regardless of the location of steno-occlusion (stent group) and their matched controls (non-stented LDLT recipients, n=131). RESULTS: The incidence of BAS was higher in patients in the stent group than that in the control group (43.2% vs 17.6%, P=0.001). Cumulative 6-month and 1-, 2- and 5-year BAS rates were 31.8%, 34.1%, 41.4% and 43.2%, respectively, in the stent group and 13.0%, 13.8%, 16.1% and 17.8%, respectively, in the control group (P=0.001). Multivariate analysis revealed that PV stenting was an independent risk factor for BAS. CONCLUSIONS: Although PV stent implantation is a reliable treatment modality for steno-occlusive PV in adult LDLT recipients, innovative methods to prevent the PV stent from crossing the line of PV anastomosis may be necessary to reduce the incidence of postoperative BAS.

关键词： portal vein stenting biliary stricture living donor liver transplantation

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Functional Materials and Innovative Strategies for Wearable Thermal Management Applications

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Nano-Micro Letters 2023年第9期15卷 562-603页

作者： Yeongju Jung Minwoo Kim Taegyeom Kim Jiyong Ahn Jinwoo Lee Seung hwan Ko Applied Nano and Thermal Science Lab Department of Mechanical EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea Department of Mechanical Roboticsand Energy EngineeringDongguk University30 Pildong-ro 1-gilJung-guSeoul 04620South Korea Institute of Advanced Machinery and Design(SNU-IAMD) Seoul National UniversityGwanak-roGwanak-guSeoul 08826South Korea Institute of Engineering Research Seoul National University1 Gwanak-roGwanak-guSeoul 08826South Korea

Thermal management is essential in our body as it affects various bodily functions,ranging from thermal discomfort to serious organ failures,as an example of the worst-case *** have been extensive studies about wearable materials and devices that augment thermoregulatory functionalities in our body,employing diverse materials and systematic approaches to attaining thermal *** paper reviews the recent progress of functional materials and devices that contribute to thermoregulatory wearables,particularly emphasizing the strategic methodology to regulate body *** exist several methods to promote personal thermal management in a wearable *** instance,we can impede heat transfer using a thermally insulating material with extremely low thermal conductivity or directly cool and heat the skin ***,we classify many studies into two branches,passive and active thermal management modes,which are further subdivided into specific *** from discussing the strategies and their mechanisms,we also identify the weaknesses of each strategy and scrutinize its potential direction that studies should follow to make substantial contributions to future thermal regulatory wearable industries.

关键词： Thermal management Passive heat transfer Active heat transfer Wearable materials Wearable device

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