http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A case of foreign body granuloma from its own hair as a foreign body
( Jaewon Lee ),( Eunjin Doh ),( Hyun Sun Yoon ),( Soyun Cho ),( Hyun Sun Park ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Hair is usually growing outward to the hair follicle. However, it is known that the hairs sometimes grows inwardly and causes some problems such as inflammatory skin diseases. A 21-year-old Korean female presented with a painful lump on her left axilla arising a month ago. She denied any trauma on the area and also denied any history of receiving invasive procedures or implantation of prosthetic materials. Ultrasonographic study of the lesion was done and we found a linear curly hyperechogenic material inside the mass. Then punch biopsy was done and we found the axillary hair inside the lesion during the biopsy procedure. Histopathologic finding showed a feature of foreign body granuloma. Therefore, the patient was diagnosed with foreign body granuloma formed by her own hair. There are previous case reports about ingrowing hair, so-called cutaneous pili migrans or creeping hair. But there are few cases about ones`` own hair acting as a foreign body. Herein we report a case of foreign body granuloma from her own axillary hair for its rarity and educational values.
Analysis and Experimental Evaluation of Normal Force of Linear Induction Motor for Maglev Vehicle
Lim, Jaewon,Jeong, Jae-Hoon,Kim, Chang-Hyun,Ha, Chang-Wan,Park, Doh-Young IEEE 2017 IEEE transactions on magnetics Vol.53 No.11
<P>This paper presents the analysis and experimental of the effective normal force and power consumption in a maglev vehicle. A maglev vehicle employs the electromagnets as suspension and linear motors for propulsion. These components give the higher ride comfort but suffered from energy efficiency. Therefore, a vector control-based algorithm and various air gaps are employed to increase the propulsion efficiency and lower the system energy consumption. The effective levitation load according to the levitation gap and normal force of a linear induction motor is calculated by power consumption in a levitation system and compared with finite-element analysis results. The experiment is carried out with the full-scaled train in test line and the efficiency of a propulsion system is also presented.</P>
임재원(Jaewon Lim),정재훈(Jaehoon Jung),박도영(Doh-young Park) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
자기부상열차는 뛰어난 승차감과 비 접촉 추진 방식에 따른 분진발생의 저감, 저소음의 특징 등에 차세대 교통수단으로 많은 관심을 받아왔다. 특히 도시형 자기부상열차의 실용화에 이어 초고속, 중고속 영역의 자기부상연구도 활발하게 진행되고 있다. 중고속 자기부상열차를 구현하는데 있어서 도시형 자기부상열차와 차별화 되는 점은 도시형자기부상열차에서 수동적으로 제어되었던 측 방향 변위 제어 시스템이라 할 수 있다. 열차가 고속화 될수록 곡선구간 주행 및 측면 외란에 의해 측방향 변위가 더 많이 발생하게 되고 이는 부상력 저하와 같은 외란으로 작용하여 부상안정성에도 직접적으로 영향을 미치게 된다. 본 논문에서는 중고속 자기부상열차용 안내 시스템을 제안하며 안내 시스템과 부상 시스템을 동시에 적용, 해석하여 자기적인 상호 작용을 검토하고 부상 시스템과 결합한 안내 제어 가능성을 검토하고자 한다. Maglev vehicle has received lots of attention as next generation transportation due to superb driving comfort and non-contact characteristic. Researches on super high and medium high speed maglev train have been carried out after commercialization project of urban maglev transit. The major distinction of urban maglev transit and medium speed maglev is the passive lateral guidance system. The higher speed train receives the more side disturbance and displacement. This paper deals the lateral guidance system of medium high speed maglev vehicle. The interactions of levitation and guidance system with guidance control feasibility are also presented.
Jeong, Jaewon,Kim, Soojin,Lim, Da-Sol,Kim, Seo-Hea,Doh, Heeju,Kim, So-Dam,Song, Yun Seon The Korean Society for Brain and Neural Science 2017 Experimental Neurobiology Vol.26 No.4
<P>Postconditioning has been shown to protect the mouse brain from ischemic injury. However, the neuroprotective mechanisms of postconditioning remain elusive. We have found that toll-like receptor 5 (TLR5) plays an integral role in postconditioning-induced neuroprotection through Akt/nuclear factor kappa B (NF-κB) activation in cerebral ischemia. Compared to animals that received 30 min of transient middle cerebral artery occlusion (tMCAO) group, animals that also underwent postconditioning showed a significant reduction of up to 60.51% in infarct volume. Postconditioning increased phospho-Akt (p-Akt) levels and NF-κB translocation to the nucleus as early as 1 h after tMCAO and oxygen-glucose deprivation. Furthermore, inhibition of Akt by Akt inhibitor IV decreased NF-κB promoter activity after postconditioning. Immunoprecipitation showed that interactions between TLR5, MyD88, and p-Akt were increased from postconditioning both <I>in vivo</I> and <I>in vitro</I>. Similar to postconditioning, flagellin, an agonist of TLR5, increased NF-κB nuclear translocation and Akt phosphorylation. Our results suggest that postconditioning has neuroprotective effects by activating NF-κB and Akt survival pathways via TLR5 after cerebral ischemia. Additionally, the TLR5 agonist flagellin can simulate the neuroprotective mechanism of postconditioning in cerebral ischemia.</P>
Lim, Jaewon,Park, Doh-Young,Jeong, Jae-Hoon IEEE 2018 IEEE transactions on magnetics Vol.54 No.11
<P>This paper presents the electromagnetic characteristics of a linear induction motor (LIM) for a semi-high-speed magnetic levitation or maglev vehicle. The propulsion system of the maglev train provides excellent ride quality, but still has a disadvantage in that the propulsion efficiency is low owing to its inherent characteristics. In particular, in the propulsion system of maglev trains with a relatively large air gap, the increase in the propulsion efficiency remains an important issue. The propulsion system generates a vertical force during propulsion control. To ensure the stability of the propulsion system, the electromagnetic characteristics of the propulsion system’s vertical force need to be interpreted accurately. The normal force and thrust are analyzed with the finite-element method considering the varying speed and slip. To improve the propulsion efficiency, variable slip-frequency operation is proposed without deteriorating the levitation performance. The thrust map of the LIM with allowable slip frequency is also presented.</P>
자기부상용 공극 센서의 필터 설계에 따른 부상 안정성 비교
김민(Min Kim),임재원(Jaewon Lim),김창현(Chang-Hyun Kim),하창완(Chang-Wan Ha),원문철(Mooncheol Won),박도영(Doh Young Park) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10
자기부상 열차와 같이 일정 곡극을 기준으로 부상을 유지하는 시스템의 경우, 부상 안정성 구현을 위해서는 부상 공극을 측정하는 센서의 정확성이 필수적으로 확보되어야한다. 하지만 시스템의 구성에 있어서 전자석 구동에 필요한 전원 및 전류 제어기에 의해 센서에 고주파 노이즈가 발생하게 되며, 이는 직접적으로 부상 제어에 악영향을 준다. 본 논문에서는 부상 정밀도 향상을 위해 네 가지 디지털 필터를 이용한 센서 신호의 노이즈 저감 효과를 확인한다. 또한, MATLAB/Simulink 해석 모델 개발 및 시뮬레이션을 통해 부상에 미치는 영향을 분석하고자 한다. Magnetic levitation system travels with a constant gap. High resolution and low noise sensor system is key factor for stable levitation control. However, power source and current controller have noise component that cause the vibration and levitation failure. In this paper, four digital filters are applied for gap sensor noise reduction. Levitation simulation results with each filter are compared to evaluate the noise reduction performance. MATLAB/Simulink software is used to analyze the levitation stability and system modeling.
김영학,도재원,Kim, Young-Hak,Doh, JaeWon 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.8
함정의 탈자결과 평가를 위한 자계신호의 분리방법에 대한 이론적 근거와 해저 면에 설치되는 사각코일로부터 발생하는 불균일한 자계가 분리결과에 미치는 영향을 측정 신호와 FEM해석을 통해 검토하였다. 측정신호는 제작된 모델함에서 발생하는 자계를 자계센서로 측정한 것이며 FEM 계산은 제작된 모델함과 동일한 형상으로 수행되었다. ILM(induced longitudinal magnetization) 신호와 IVM(induced vertical magnetization) 신호는 함정이 가지는 투자율과 지자계의 수평과 수직방향 성분에 의해 각각 발생하는 자화에 의한 것이며, PLM(permanent longitudinal magnetization) 신호와 PVM(permanent vertical magnetization) 신호는 함정의 영구자화의 수평성분과 수직성분에 의한 것임이 확인되었다. 또한 사각 코일의 수직방향의 자계는 균일한 지자계를 완전히 상쇄할 수 없어 사각코일의 면적에 가까운 크기를 가지는 함정 일수록 사각코일의 자계 불균일성의 영향을 크게 받게 됨을 알았다. This paper investigated the separation of magnetic signal from a ferro-magnetic object. The magnetic signals were ILM(induced longitudinal magnetization) and IVM(induced vertical magnetization), which were induced by earth magnetic field and PLM(permanent longitudinal magnetization) and PVM(permanent vertical magnetization), which were due to a permanent magnetization of the object, respectively. Magnetic signal separation was based on the fact that magnetization vector could be analyzed according to longitudinal and vertical directions. Also the influence of non-uniform magnetic field from a rectangular coil on the separation was examined. A military vessel with a size close to rectangular coil has more errors on the magnetic signal separation.
Lee, Noho,Choi, Il Yong,Doh, Kyung-Yeon,Kim, Jaewon,Sim, Hyeji,Lee, Donghwa,Choi, Si-Young,Kim, Jong Kyu The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.46
<P>A hierarchical electrode consisting of edge-exposed 1T phase WS2, grown on an array of surface-modified WO3 nanohelixes (NHs), and its enhanced catalytic performance in the hydrogen evolution reaction (HER) are presented. The oxygen-deficient WO3 NH surface modified by controlled annealing facilitates the formation of a rich edge-exposed WS2 during sulfurization. In addition, metallic 1T phase WS2 is preferentially grown on the WO3 NHs owing to the strain induced between WS2 and curved WO3 NHs. Such desirable structural properties, metallic 1T phase and a rich edge-exposed morphology of the catalytic electrode directly resulted in an enhanced HER performance in water splitting.</P>