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Journal of Environmental Sciences 2017年第5期29卷 157-163页

作者： Lakshmi Pethakamsetty Kalyani Kothapenta Hanumanta Rao Nammi Lakshmi Kalyani Ruddaraju Pratap Kollu soon gil yoon Sri Venkata Narayana Pammi Department of Microbiology College of Science and Technology Andhra University Visakhapatnam 530003 India DST-PURSE Programme Advanced Analytical Laboratory Andhra University Visakhapatnam 530003 India Sri Vishnu College of Pharmacy Department of Pharmaceutical Technology Vishnupur Bhimavaram A.P. 530041 India DST-INSPIRE Faculty Department of Metallurgical Engineering & Materials Science Indian Institute of Technology Bombay Mumbai 400076 India Department of Materials Science and Engineering Chungnam National University Daeduk Science Town 305-764 Daejeon South Korea

The current research study focuses to formulate the biosynthesized silver nanoparticles for the first time from silver acetate using methanolic root extracts of Diospyros sylvatica,a member of family Ebenaceae. TEM analysis revealed the average diameter of Ag NPs around 8 nm which is in good agreement with the average crystallite size（10 nm）calculated from X-ray Diffraction（XRD）analysis. Further the study has been extended to the antimicrobial activity against test pathogenic Gram（＋）ve,Gram（-）ve bacterial and fungal strains. The bioinspired Ag-NP showed promising activity against all the tested bacterial strains and the activity was enhanced with increased dosage levels

关键词： Root extract Silver nanoparticles Antimicrobial properties

Confluence of ZnO and PTFE Binder for Enhancing Performance of Thin-Film Lithium-Ion Batteries

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Energy & Environmental Materials 2024年第5期7卷 48-56页

作者： Subhashree Behera Swathi Ippili Venkatraju Jella Na-Yeong Kim Seong Cheol Jang Ji-Won Jung soon-gil yoon Hyun-Suk Kim Department of Materials Science and Engineering Chungnam National UniversityDaejeon 34134South Korea School of Materials Science and Engineering University of UlsanUlsan 44776South Korea Department of Energy and Materials Engineering Dongguk UniversitySeoul 04620South Korea

Developing anode materials with high specific capacity and cycling stability is vital for improving thin-film lithium-ion ***-film zinc oxide(ZnO)holds promise due to its high specific capacity,but it suffers from volume changes and structural stress during cycling,leading to poor battery *** this research,we ingeniously combined polytetrafluoroethylene(PTFE)with ZnO using a radio frequency(RF)magnetron co-sputtering method,ensuring a strong bond in the thin-film composite *** effectively reduced stress on the active material and mitigated volume change effects during Li^(+)ion intercalation and *** composite thin films are thoroughly characterized using advanced techniques such as X-ray diffraction,scanning electron microscopy,and X-ray photoelectron spectroscopy for investigating correlations between material properties and electrochemical ***,the ZnO/PTFE thin-film electrode demonstrated an impressive specific capacity of 1305 mAh g^(-1)(=7116 mAh cm^(-3))at a 0.5C rate and a remarkable capacity retention of 82%from the 1st to the 100th cycle,surpassing the bare ZnO thin film(50%).This study provides valuable insights into using binders to stabilize active materials in thin-film batteries,enhancing battery performance.

关键词： li-ion batteries metal oxides anodes polytetrafluoroethylene(PTFE) thin films

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

Characterization of Wollastonite Glass-ceramics Made from Waste Glass and Coal Fly Ash

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Journal of Materials Science & Technology 2013年第2期29卷 149-153页

作者： soon-Do yoon Jong-Un Lee Jeong-Hwan Lee Yeon-Hum Yun Wang-Jung yoon School of Biotechnology and Chemical Engineering Chonnam National University Department of Energy & Resources Engineering Chonnam National University

The crystallization behavior of wollastonite glass-ceramics was investigated by means of X-ray diffraction （XRD） analysis and surface morphological observations, and the chemical compositions were evaluated by field emission-scanning electron microscopy （FE-SEM） and energy dispersive X-ray spectroscopy （EDS）. Various heat treatment temperatures （850, 900, 950, 1000 and 1050 ℃） were used to obtain glass-ceramics of the ideal wollastonite crystal phase as well as optimum mechanical properties and chemical durability. From XRD, FE-SEM and EDS, the crystallization of acicular crystal phase in the matrix was achieved at heat treatment temperature of 1000 and 1050 ℃, and wollastonite （CaSiO3） was found in the acicular type main crystal phase in the glass-ceramics. Various properties, such as density, compressive strength, bending strength and chemical durability were also examined. The mechanical properties of glass-ceramics obtained at the heat treatment temperature of 1000 and 1050 ℃ were superior to those obtained at the heat treatment temperature of 850 ℃.

关键词： Coal fly ash Waste glass Mechanical properties Glass-ceramics

An Advanced Probabilistic Neural Network for the Design of Breakwater Armor Blocks

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China Ocean Engineering 2007年第4期21卷 597-610页

作者： Dookie KIM Dong Hyawn KIM Seongkyu CHANG gil Lim yoon Department of Civil and Environmental Engineering Kunsan National UniversityKunsanJeonbukKorea Department of Ocean System Engineering Kunsan National UniversityKunsanJeonbukKorea Coastal Engineering Research Department KORDIAnsanGyeonggiKorea

In this study, an advanced probabilistic neural network （APNN） method is proposed to reflect the global probability density function （PDF） by summing up the heterogeneous local PDF which is automatically determined in the individual standard deviation of variables. The APNN is applied to predict the stability number of armor blocks of breakwaters using the experimental data of＇ van der Meet, and the estimated results of the APNN are compared with those of an empirical formula and a previous artificial neural network （ANN） model. The APNN shows better results in predicting the stability number of armor bilks of breakwater and it provided the promising probabilistic viewpoints by using the individual standard deviation in a variable.

关键词： breakwater armor block stability number multivariate gaussian distribution classigication artificial neural network (ANN) advanced probabilistic neural network (APNN)

Callus proliferation-induced hypoxic microenvironment decreases shoot regeneration competence in Arabidopsis

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Molecular Plant 2024年第3期17卷 395-408页

作者： Dohee Koo Hong gil Lee soon Hyung Bae Kyounghee Lee Pil Joon Seo Department of Chemistry Seoul National UniversitySeoul 08826Korea Plant Genomics and Breeding Institute Seoul National UniversitySeoul 08826Korea Research Institute of Basic Sciences Seoul National UniversitySeoul 08826Korea

Plants are aerobic organisms that rely on molecular oxygen for respiratory energy *** conditions,with oxygen levels ranging between 1%and 5%,usually limit aerobic respiration and affect plant growth and ***,we demonstrate that the hypoxic microenvironment induced by active cell proliferation during the two-step plant regeneration process intrinsically represses the regener-ation competence of the callus in Arabidopsis *** showed that hypoxia-repressed plant regener-ation is mediated by the RELATED TO APETALA2.12(RAP2.12)protein,a memberof the Ethylene Response Factor VIl(ERF-Vll)*** found that the hypoxia-activated RAP2.12 protein promotes salicylic acid(SA)biosynthesis and defense responses,thereby inhibiting pluripotency acquisition and de novo shoot regeneration in *** and genetic analyses revealed that RAP2.12 could bind directly to the SALICYLIC ACID INDUCTION DEFICIENT 2(SID2)gene promoter and activate SA biosynthesis,repressing plant regeneration possibly via a PLETHORA(PLT)-dependent ***,the rap2.12 mutant calli exhibits enhanced shoot regeneration,which is impaired by SA *** together,these find-ings uncover that the cell proliferation-dependent hypoxic microenvironment reduces cellular pluripotency and plant regeneration through the RAP2.12-SID2 module.

关键词： callus cell proliferation-induced hypoxia SID2 plant regeneration salicylic acid RAP2.12

Successful treatment of basaloid squamous cell carcinoma in the rectosigmoid colon: A case report and review of literature

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World Journal of Clinical Cases 2020年第14期8卷 3057-3063页

作者： Taek-Gu Lee soon Man yoon Myung Jo Kim Department of Surgery Chungbuk National University HospitalChungbuk National University College of MedicineCheongju 28644South Korea Department of Internal Medicine Chungbuk National University HospitalChungbuk National University College of MedicineCheongju 28644South Korea

BACKGROUND Compared with colorectal adenocarcinoma,basaloid squamous cell carcinomas(BSCCs)arising in the colorectum are rare and have very poor *** date,only nine cases have been *** BSCCs are extensively involved in metastasis to the lymph node,liver,and lung at *** many clinicians attempting to effectively treat BSCCs,therapeutic consensus has not been established due to lack of *** SUMMARY A 58-year-old woman presented with abdominal pain,diarrhea,fever,and *** was referred from a department of gynecology and was diagnosed with a suspicious leiomyosarcoma of the rectum or a pedunculated myoma of the *** exophytic growing mass at the right lateral wall of the rectum with an internal cystic portion and hemorrhage was observed on magnetic resonance *** patient underwent low anterior resection and total hysterectomy with bilateral *** findings revealed a cellular mass with a solid growth pattern and few glandular structures,many foci of intratumoral necrosis,and a palisading *** pathologist diagnosed tumor as a BSCC,and the patient received chemotherapy with fluorouracil/leucovorin without *** patient is currently alive 8 years after the surgery with no manifestations of metastatic colon *** Our case suggest that curative resection and chemotherapy play important roles in improving survival,and radiotherapy may be an option to avoid radiationassociated enteritis.

关键词： Basaloid squamous cell carcinomas Rectosigmoid colon Colorectal cancer Adjuvant chemotherapy Curative resection Case report

Endoscopic radial incision and cutting technique for treatment-naive stricture of colorectal anastomosis:Two case reports

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World Journal of Gastrointestinal Surgery 2020年第11期12卷 460-467页

作者： Taek-Gu Lee soon Man yoon Sang-Jeon Lee Department of Surgery Chungbuk National University HospitalChungbuk National University College of MedicineCheongju-si 28644Chungcheongbuk-doSouth Korea Department of Internal medicine Chungbuk National University HospitalChungbuk National University College of MedicineCheongju-si 28644Chungcheongbuk-doSouth Korea

BACKGROUND Anastomotic stenosis(AS)after colorectal surgery was treated with balloon dilation,endoscopic procedure or *** endoscopic procedures including dilation,electrocautery incision,or radial incision and cutting(RIC)were preferred because of lower complication rates than surgery and are less *** RIC has a greater success rate than dilation *** reports showed that repeated RICs were needed to maintain patency of the *** report that single session RIC was applied only to treatment-naive patients with *** SUMMARY Two female patients presented with *** patient had advanced rectal cancer and the other had a refractory stenosis following surgery for endometriosis at sigmoid *** endoscopic RIC procedure was performed as follows.A single small incision was carefully made to increase the view of the proximal colon and the incision was expanded until the surgical stapling ***,we made a further circumferential excision with endoscopic knife along the inner border of the surgical staple *** the end of the procedure,the standard colonoscope was able to pass freely through the widened *** patients showed improved AS after a single session of RIC without immediate or delayed procedure-related ***-up colonoscopy at 7 and 8 mo after endoscopic RIC revealed intact anastomotic sites in both *** treatment-related adverse events or recurrence of the stenosis was demonstrated during follow-up periods of 20 and 23 *** The endoscopic RIC may play a role as one of treatment options for treatmentnaive AS with short stenotic lengths.

关键词： Colorectal surgery Anastomosis Stenosis Endoscopy Radial incision Case report

Effects of Mg Enhancement and Heat Treatment on Microstructures and Tensile Properties of Al2Ca-Added ADC12 Die Casting Alloys

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Journal of Materials Science & Technology 2016年第10期32卷 1043-1048页

作者： gil-Yong Yeom Hyun Kyu Lim Shae K.Kim soong-Keun Hyun Young-Ok yoon Korea Institute of Industrial Technology lncheon 406-840 South Korea Department of Materials Science and Engineering Inha University lncheon 402-751 South Korea

The effects of Mg enhancement and heat treatment on the microstructures and tensile properties of Al_2Ca-added ADC12 die casting alloys were investigated. 0.3% and 0.5% Mg in the form of a master alloy including a trace amount of Al_2Ca were added to conventional ADC12（383 and AlSi10Cu2Fe） alloy with an initial Mg-content of 0.3% to increase the Mg content to 0.6% and 0.8%, respectively. To avoid heat treatmentinduced surface blisters, shortened solution treatment for 15 min at 490 ℃ and artificial aging for 6 h at 150 ℃ was undertaken. The results show that a 10% improvement in the shape factor of eutectic Si particles was achieved for Al_2Ca-added ADC12 with 0.8% Mg compared to the conventional ADC12 in the as-aged condition. Al_2Ca-added ADC12 with 0.8% Mg exhibited a yield strength of 289 MPa, a tensile strength of 407 MPa, and an elongation of 4.22%.

关键词： Al2Ca ADC12 alloy Heat treatment Die casting Inclusion

A case of unsuspected trans-orbital-cranial penetrating injury by a wooden chopstick in a one-year-old infant

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International Journal of Ophthalmology(English edition) 2022年第3期15卷 523-526页

作者： Yeon Woong Chung soon Young Lee Tae yoon La Department of Ophthalmology St.Vincent’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 16247Korea

Dear Editor,Transorbital penetrating injury is one emergency faced by ophthalmologists during primary care that requires special attention because it can lead to serious ophthalmic and neurological *** all head injuries, intracranial penetrating injuries occur at a low rate of 0.4%[1], and transorbital-cranial penetrating injuries are even more rare, but do occur more frequently in young children than in adults[2-3].

关键词： injuries infant orbital