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Highly conducting fibrous carbon-coated silicon alloy anode for lithium ion batteries
Jang, Juyoung,Kang, Inyeong,Yi, Kyung-Woo,Cho, Young Whan Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.454 No.-
<P><B>Abstract</B></P> <P>Carbon-coated silicon/iron silicide nanocomposite anodes developed for lithium ion rechargeable batteries present a large initial irreversible capacity owing to many pores in the carbon coating layer generated from the carbonization of polyfurfuryl alcohol (PFA) resin during the heat treatment. To overcome this issue of large initial irreversible capacity loss, we attempted to fill the pores via chemical vapor deposition (CVD) of carbon using acetylene as the source. The Brunauer-Emmett-Teller surface area is reduced from 51 to 7 m<SUP>2</SUP> g<SUP>−1</SUP> and the initial irreversible capacity also decreased from 197 mA h g<SUP>−1</SUP> corresponding to a simple resin-coated sample to 164 mA h g<SUP>−1</SUP> after CVD of carbon on the resin-derived carbon coating. The rate capability tests show an excellent ability to maintain a capacity of 500 mA h g<SUP>−1</SUP> at the rate of 7 C (10.5 A g<SUP>−1</SUP>), suggesting that the carbon nanofibers (CNFs) formed by the catalytic decomposition of acetylene on iron silicide grains aid in improving the electrical connection between the active anode particles during cycling.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CVD coating reduces both the surface area and initial irreversible capacity of anode. </LI> <LI> Carbon nanofiber grown on the surface of iron silicide improves the rate capability. </LI> <LI> Electrical conductivities of anodes coated with different methods are compared. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
박지은,Park Soyeon,Kang Inyeong,Noh Gunwoo 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.5
This study analyzed the effects of implant design factors (diameter, length, and connection type) and bone quality on the long-term success of implantation via finite element (FE) analysis, considering the bone remodeling process. A total of 36 cases of the three-dimensional FE model, with an implant complex located in the mandibular bone section of the molar region, were considered. An FE analysis considering dental bone remodeling was implemented in the Abaqus UMAT subroutine. A preload of 32 N∙cm and an average biting force of 50 N were applied during the bone remodeling process as the loading conditions. After the bone remodeling process, a maximum biting force of 200 N was applied in the oblique direction. The stability of the peri-implant bone was analyzed by measuring the apparent bone density over time and the principal strain in the cancellous bone. The stability of the peri-implant bone differs depending on the host bone conditions and implant design features. The initial bone condition greatly influenced the final density and maximum principal strain distribution in the cancellous bone surrounding the implant. The need for a stability evaluation considering the bone remodeling process has increased under the conditions of placing short-length and narrow-diameter implants in poor-quality bones.
LC-MS/MS를 이용한 조피볼락 근육에서 구충제 febantel 및 그 대사체들의 정량분석을 위한 시료 전처리 방법의 비교 분석
임재웅 ( Jae-woong Lim ),권인영 ( Inyeong Kwon ),김태호 ( Taeho Kim ),김위식 ( Wi-sik Kim ),강소영 ( So Young Kang ) 한국어병학회 2021 한국어병학회지 Vol.34 No.2
This study presents the evaluation of sample extraction and purification procedure for the determination of residues of febantel and its metabolites, fenbendazole, oxfendazole and oxfendazole sulfone in rockfish (Sebastes schlegeli) muscle using liquid chromatography-tandem mass spectrometry. Residues of febantel and its metabolites in rockfish muscle were analyzed using each different sample preparation method from Korean Food Standards Codex (KFSC), Food Safety and Inspection Service (FSIS, USA), and the modified FSIS method using QuEChERS kit (FSIS-Q), respectively. Each method was compared for mean recoveries and repeatabilities. Since FSIS-Q showed higher repeatabilities (coefficient of variation, CV of 2.4%~10.9%) than those of FSIS method (CV of 4.6%~17.5%), recoveries from FSIS-Q were compared with those from KFSC method. FSIS-Q showed significantly higher recoveries of 83.1%~110.1% (P < 0.05) than those from KFSC method of 64.7%~107.4%. In addition, FSIS-Q showed a good linearity over the range of 2.5~200 μg/kg, and excellent sensitivities with limit of detection of 0.46~0.71 μg/kg and limit of quantification of 1.08~2.15 μg/kg. Although all the sample preparation methods turned out to be able to meet CODEX guideline for all the compounds, FSIS method and FSIS-Q validated in this study could be applied to screening and quantification for residues of febantel and its metabolites in rockfish muscle with efficient preparation procedures.
Finite Element Analysis of Wrist Orthosis with 3D Printing
최현우(Hyeun-Woo Choi),강인영(Inyeong Kang),노건우(Gunwoo Noh),서안나(Anna Seo),이종민(Jong-Min Lee) 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.7
임상에서 사용하는 진단 검사 장치인 전산화 단층촬영기와 자동화된 설계 소프트웨어(MediACE 3D Program), 3D 프린터로 손목 보조기를 제작하고자 하였다. 전산화단층촬영기로 상지의 Dicom 파일을 획득한 후 MediACE 3D Program을 통해 손목 보조기를 디자인하여 STL(stereolithography) 파일을 만들었고, 디자인된 손목 보조기는 3D 프린터를 이용하여 인쇄하였다. 3D 프린팅 기술로 제작된 손목보조기의 효용성 검증을 위해 뼈와 피부에 가해지는 압력 및 보조기의 스트레스 분포를 유한요소해석으로 나타내었다. 손목 보조기를 제작할 때 유한요소해석의 결과를 가지고 뼈와 피부가 압력에 의한 손상과 보조기의 파손이 자주 일어나는 부위를 보강하여 손목 보조기를 제작할 수 있을 것이라고 기대된다. The purpose of this study was to manufacture a wrist brace using a computerized tomography system, clinical design software (MediACE 3D Program), and 3D printer. After acquiring the Dicom file of the upper limb with a computed tomography, the wrist brace was designed using the MediACE 3D Program to create a stereolithography file. The designed wrist brace was printed using a 3D printer. To verify the effectiveness of wrist assistive device manufactured by 3D printing technology, the stress distribution of the pressure and orthosis applied to bone and skin is represented by finite element analysis. It is expected that the wrist brace can be manufactured by reinforcing the part where the damage caused by pressure and breakage of the brace frequently occurs with the result of finite element analysis when producing the wrist brace.