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Energy & Environmental Materials 2024年第3期7卷 190-201页

作者： Sujeong Kim Boseok Seo Hyerim Park Younghwan Im Jeong Yeon Do Byung sub kwak Namgyu Son Minkyu Kim Misook Kang Department of Chemistry College of Natural SciencesYeungnam UniversityGyeongsan Gyeongbuk 38541Korea School of Chemical Engineering Yeungnam UniversityGyeongsan Gyeongbuk 38541Korea Department of Energy and Hydrocarbon Chemistry Graduate School of EngineeringKyoto UniversityKyoto 615-8510Japan Korea Evaluation Institute of Industrial Technology(Keit) Cheomdan-Ro 8-GilDong-GuDaegu 41069Korea Korea Electric Power Research Institute(KEPRI)105 Munji-ro Yooseong-guDaejeon 34056Korea

CuS is an encouraging photoelectrode candidate that meets the essential requirements for efficient solar-to-hydrogen production,but it has not been thoroughly studied.A CuS light absorber layer is grown by the self-assembly of copper and sulfur precursors on a carbon paper(CP)***,rGO is introduced as a buffer layer to control the optical and electrical properties of the *** well-ordered microstructural arrangement suppresses the recombination loss of electrons and holes owing to enhanced charge-carrier generation,separation,and *** potential reaching 10 mA cm^(-2)in 1.0 M KOH solution is significantly lowered to 0.87 V,and the photocurrent density at 1.23 V is 94.7 mA cm^(-2).The computational result reveals that the potential-determining step is sensitive to O^(*)stability;the lower stability of O^(*)in the thin layer of CuS/rGO decreases the free-energy gap between the initial and final states of the potential-determining step,resulting in a lowering of the onset *** faradaic efficiency for the photoelectrochemical oxygen evolution reaction in the optimized 2CuS/1rGO/CP photoanode is 98.60%,and the applied bias photon-to-current and the solar-to-hydrogen efficiencies are 11.2%and 15.7%,respectively,and its ultra-high performance is maintained for 250 *** record-breaking achievement indices may be a trigger for establishing a green hydrogen economy.

关键词： 15.7%-solar to hydrogen density functional theory lower photopotential p-CuS/rGO/CP photoanode photoelectrochemical oxygen evolution

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Dysphagia in patients with isolated pontine infarction

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Neural Regeneration Research 2018年第12期13卷 2156-2159页

作者： Min Cheol chang Sang Gyu kwak Min Ho Chun Department of Rehabilitation Medicine College of Medicine Yeungnam University Department of Medical Statistics College of Medicine Catholic University of Daegu Department of Rehabilitation Medicine Asan Medical Center University of Ulsan College of Medicine

Little is known about dysphagia after pontine infarction. In this study, we evaluated the incidence of dysphagia after isolated pontine infarction and identified the predictive factors for the occurrence of dysphagia. A total of 146 patients were included in this study. All patients underwent clinical testing for dysphagia within 1 day after admission and at the time of discharge. We compared the incidence of dysphagia between patients with unilateral pontine infarction and those with bilateral pontine infarction. To evaluate the functional status of patients, we investigated their initial modified Rankin Scale（mRS） score and initial National Institutes of Health Stroke Scale（NIHSS） score within 1 day of admission. Of 146 patients, 50（34.2%） had dysphagia initially within 1 day after admission. At the second evaluation at the time of discharge, dysphagia was diagnosed in 24 patients（16.4%）. Patients with bilateral pontine infarction were more likely to present with dysphagia. In addition, clinical severity（in terms of mRS and NIHSS scores） was identified as a predictor of dysphagia in patients with cerebral infarction（multiple binary logistic regression analysis, mRS： P = 0.011, NIHSS： P = 0.004）. Dysphagia frequently occurs in patients with isolated pontine infarction. Clinicians should pay particular attention to the occurrence of dysphagia, especially in patients with bilateral pontine infarction or high functional disability.

关键词： dysphagia pons infarction stroke prediction NIHSS score MRS score

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Stabilization of the Anatase Phase of Ti_(1-x)Sn_(x)O_(2) (x < 0.5) Nanofibers

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Nano Research 2010年第4期3卷 256-263页

作者： Kandasami Asokan Jae Young Park Sunwoo Choi changhwan chang Sang sub Kim School of Materials Science and Engineering Inha UniversityIncheon 402-751Republic of Korea Inter-University Accelerator Centre Aruna Asaf Ali MargNew Delhi 110067India Department of Materials Test and Analysis Research Institute of Industrial Science and TechnologyPohang 790-600Republic of Korea

We experimentally investigate the stabilization of the anatase phase of Ti_(1-x)Sn_(x)O_(2)(x<0.5)nanofibers when synthesized by an electrospinning *** as-spun nanofibers became nano-grained,polycrystalline nanofibers after calcination and the diameters of the nanofibers depend on Sn *** of the anatase phase in Ti-rich compositions and incorporation of Sn ions were confirmed by X-ray diffraction,Raman,X-ray absorption near-edge structure,and photoluminescence(PL)*** from the PL study also demonstrated the tunable nature of the optical properties,with the emission maximum shifting towards higher wavelength with increasing Sn concentration.

关键词： Electrospinning nanofiber Ti_(1-x)Sn_(x)O_(2) X-ray absorption near-edge structure(XANES)

Spatial distribution and comparative evaluation of phosphorus release rate in benthic sediments of an estuary dam

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International Journal of Sediment Research 2022年第3期37卷 355-369页

作者： Yongsik Song Yong-Hoon Jeong chang-Min Shin Dong-Heui kwak Geosystem Research Corporation Department of Civil Engineering Jeonbuk National University Department of Bio-Convergence Science Jeonbuk National University Water Quality Assessment Research Division National Institute of Environmental Research Department of Bioactive Materials Science Jeonbuk National University

A series of experiments and simulations were performed to ascertain the rate at which phosphorus is released using a water quality model in Saemangeum Lake, an artificially constructed lake located in an estuary. The general inflow of seawater once a day contributed to the formation of a halocline in the lake water, which caused variation in the vertical concentration of dissolved oxygen. The halocline was mainly observed in the deep downstream regions of Saemangeum Lake that are close to the open sea. In contrast, the shallower regions upstream, which are under the influence of pollutant-loading from upstream rivers, exhibited high concentrations of chemical oxygen demand, total phosphorus, and Chl-a,resulting in lower water quality than the downstream regions. Laboratory experiments investigating the release of phosphorus at five representative locations showed that the upstream release flux, where the halocline was weaker, was higher than that downstream, where the initial level of phosphorus sedimentation was high. In particular, a need for an accurate evaluation method for the release of phosphorus at each site was suggested as slight differences were obtained depending on the estimation method used at each representative location. The results of the phosphorus release experiments led to the use of time-weighted integration(TWI), terminated time evaluation, and statistical mean value; the Environmental Fluid Dynamics Code-National Institute of Environment Research model, a widely used water quality model for studying retention watersheds, was applied to the simulation of hydraulic and water quality characteristics for the Saemangeum Lake and its surrounding waters. The result of the water quality simulation indicated the highest reproducibility for release-time TWI so that TWI values were more useful in predicting phosphorus concentrations and the subsequent management of water quality.

关键词： Eutrophication Phosphorus release Salinity Sediments Water quality simulation Environmental Fluid Dynamics Code–National Institute of Environment Research model (EFDC-NIER)

Aligned Ion Conduction Pathway of Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic Chains for Solid‑State Lithium–Oxygen Batteries

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Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram Kim Myeong‑chang Sung Gwang‑Hee Lee Byoungjoon Hwang Sojung Seo Ji‑Hun Seo Dong‑Wan Kim Department of Materials Science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials Science and Chemical Engineering Center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and safety *** study addresses these problems by proposing a modified polyrotaxane(mPR)-based solid polymer electrolyte(SPE)design that simultaneously mitigates solvent-related problems and improves ***-SPE exhibits high ion conductivity(2.8×10^(−3)S cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-SPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray diffraction confirm the ability of the SPE to hinder the permeation of oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial for restricting the sub-reactions of solid-state LOBs.

关键词： Solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

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Repeatedly elevatedγ-glutamyltransferase levels are associated with an increased incidence of digestive cancers:A population-based cohort study

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World Journal of Gastroenterology 2021年第2期27卷 176-188页

作者： chang-Hoon Lee Kyungdo Han Da Hye Kim Min-Sun kwak Department of Internal Medicine Seoul National University HospitalSeoul 03080South Korea Department of Statistics and Actuarial Science Soongsil UniversitySeoul 06978South Korea Department of Biostatistics College of MedicineCatholic University of KoreaSeoul 06591South Korea Department of Internal Medicine Healthcare Research InstituteHealthcare System Gangnam CenterSeoul National University HospitalSeoul 06236South Korea

BACKGROUND The association between elevatedγ-glutamyltransferase(GGT)at a certain point and incident cancer has been suggested;however,no study has evaluated the association between repeatedly elevated GGT and cancer *** To investigate the effects of repeatedly elevated GGT on the incidence of digestive *** Participants who had undergone health screening from 2009 to 2012 and 4 consecutive previous examinations were *** points were calculated as the number of times participants met the criteria of quartile 4 of GGT in four serial measurements(0-4 points).Multivariable Cox proportional hazard regression models were *** In total,3559109 participants were included;among them,43574 digestive cancers developed during a median of 6.8 years of *** incidence of total digestive cancers increased in a dose-response manner in men[adjusted hazard ratio(aHR)compared with those with 0 GGT points=1.28 and 95%confidence interval(CI)=1.24-1.33 in those with 1 point;aHR=1.40 and 95%CI=1.35-1.46 in those with 2 points;aHR=1.52 and 95%CI=1.46-1.58 in those with 3 points;aHR=1.88 and 95%CI=1.83-1.94 in those with 4 points;P for trend<0.001].This trend was more prominent in men than in women and those with healthy habits(no smoking,no alcohol consumption,and a low body mass index)than in those with unhealthy *** Repeatedly elevated GGT levels were associated with an increased risk of incident digestive cancer in a dose-responsive manner,particularly in men and those with healthy *** GGT measurements may be a good biomarker of incident digestive cancer and could help physicians identify high-risk populations.

关键词： Gamma-glutamyltransferase Cancer Digestive organ Serial exam Incident cancer Biomarker

Postoperative adjuvant chemoradiotherapy in D2-dissected gastric cancer: Is radiotherapy necessary after D2-dissection?

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World Journal of Gastroenterology 2014年第36期20卷 12900-12907页

作者： Jee Suk chang Woong sub Koom Youngin Lee Hong In Yoon Hyung Sik Lee Department of Radiation Oncology Yonsei University College of Medicine Seoul 120-752 South Korea Department of Radiation Oncology Dong-A University Hospital Busan 602-715 South Korea

Studies from the Far East have demonstrated that D2-dissection is superior to D0/1-dissection. The effect of postoperative chemoradiotherapy(CRT) after D2-dissection has not been accepted due to the lack of D2-dissection in Western countries, as well as the potential harmful effect of radiotherapy. In the current NCCN guideline, adjuvant chemotherapy alone is recommended in D2-dissected patients. However, three recent prospective randomized controlled trials in South Korea and China(ARTIST, NCC and Multicenter IMRT Trials) demonstrated that adjuvant CRT can be safely administered to D2-dissected patients with notable benefits. To identify the role of radiotherapy(RT) in the D2-dissected postoperative setting, clinical research attempts should include(1) identification of high-risk patients for loco-regional recurrence who might benefit from CRT;(2) modification of RT target volume based on the findings that failure patterns should be different after D1- and D2-dissection; and(3) integration of new RT techniques to decrease treatment-related toxicity. The present paper is a review of recent studies addressing these fields. Well-designed prospective randomized studies are needed to clearly define the role of adjuvant CRT in D2-dissected gastric cancer, however, future clinical studies should also focus on answering these questions.

关键词： Gastric cancer D2-dissection Recurrence Radiotherapy Chemotherapy

Investigation of operation and degradation mechanisms in ZnTeSe blue quantum-dot light-emitting diodes by identifying recombination zone

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Nano Research 2024年第7期17卷 6527-6533页

作者： Oul Cho Sujin Park Hogeun chang Jiwhan Kim Jaekwon Kim Sungwoo Kim Taehyung Kim Jeonghun kwak Department of Electrical and Computer Engineering Inter-university Semiconductor Research Centerand Soft Foundry InstituteSeoul National UniversitySeoul 08826Republic of Korea Material Research Center Samsung Advanced Institute of TechnologySuwonGyeonggi-do 16419Republic of Korea

ZnTeSe quantum dots(QDs),recognized as promising eco-friendly blue electroluminescent emitters,remain under-explored in light-emitting diode(LED)***,to elucidate the operation and degradation mechanisms of ZnTeSe blue QD-LEDs,stacked ZnTeSe QD layers with discernable luminescence are designed by varying Te doping concentrations,and the recombination zones(RZs)of the blue QD-LEDs are *** RZs are identified near the hole-transport layer(HTL),confirmed by angular-dependent electroluminescence measurements and optical *** addition,in order to investigate carrier dynamics in the process of recombination,the transient electroluminescence(tr-EL)signals of the dichromatic QD-LEDs are *** a result,it is inferred that the RZ initially formed near the electron-transport layer(ETL)due to the high injection barriers of ***,due to the fast electron mobility,the RZ shifts toward the HTL as the operating current *** the device lifetime tests,the RZ remains stationary while the photoluminescence(PL)corresponding to the RZ undergoes a substantial decrease,indicating that the degradation is accelerated by the concentrated *** this study contributes to a deeper understanding of the operational mechanisms of ZnTeSe blue QD-LEDs.

关键词： quantum dots light-emitting diodes degradation recombination zones carrier dynamics

Disseminated soft tissue diffuse large B-cell lymphoma involving multiple abdominal wall muscles:A case report

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World Journal of Clinical Cases 2021年第28期9卷 8557-8562页

作者： chang-Hoon Lee So-Yeon Jeon Ho-Young Yhim Jae-Yong kwak Department of Internal Medicine Jeonbuk National University Medical SchoolJeonju 54907South Korea

BACKGROUND Diffuse large B-cell lymphoma(DLBCL)is the most common subtype of non�Hodgkin lymphoma,and patients with DLBCL typically present rapidly growing *** involving muscle is rare and accounts for only 5%;furthermore,multiple muscles and soft tissue involvement of DLBCL is *** to unusual clinical manifestation,accurate diagnosis could be *** SUMMARY A 61-year-old man complained of swelling,pain and erythematous changes in the lower ***,soft tissue infection was suspected,however,skin lesion did not respond to antibiotics.18Fluoro-2-deoxy-D-glucose(18F-FDG)positron emission tomography-computed tomography demonstrated FDG uptake not only in the skin and subcutaneous tissue of the abdomen but also in the abdominal wall muscles,peritoneum,perineum,penis and *** was confirmed by biopsy of the abdominal wall muscle and subcutaneous *** intensive treatment including chemotherapy with rituximab,cyclophosphamide,doxorubicin,vincristine and prednisolone,central nervous system prophylaxis(intrathecal injection of methotrexate,cytarabine and hydrocortisone)and orchiectomy,he underwent peripheral blood stem cell mobilization for an autologous hematopoietic stem cell *** intensive treatment,the disease progressed rapidly and the patient showed poor outcome(overall survival,9 mo;disease free survival,3 mo).CONCLUSION The first clinical manifestation of soft tissue DLBCL involving multiple muscles was similar to the infection of the soft tissue.

关键词： Primary extranodal diffuse large B-cell lymphoma Soft tissue lymphoma Disseminated muscles and soft tissue invasion Atypical presentation of diffuse large B�cell lymphoma Central nervous system relapse Case report