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상대정맥증후군 환자에서 발생한 안허혈에 의한 신생혈관녹내장 1예
전지훈,조경진,장기철,장무환,Ji Hoon Jeon,MD,Kyong Jin Cho,MD,Ki Cheol Chang,MD,PhD,Moo Hwan Chang,MD,PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.9
Purpose: To report a case of neovascular glaucoma (NVG) with ocular ischemia in superior vena cava syndrome (SVCS). Case summary: A 57-year old male who had been treated for small cell lung cancer (SCLC) visited our hospital because of SVCS-like symptoms and decreased visual acuity in the right eye. On the initial examination, best corrected visual acuity was 0.5, intraocular pressure (IOP) was 38 mm Hg and relative afferent papillary defect was positive in the right eye. Slit lamp examination showed mild dilatation and tortuosity of the episcleral vessels and ruobeosis iridis. Gonioscopic examination showed neovascularization of the opened angle. Fluorescein angiography showed delayed choroidal filling and nevascularization of the disc. The patient was diagnosed with NVG with ocular ischemia in SVCS and was treated with chemotherapy and steroid therapy. In addition, intravitreal bevacizumab and IOP lowering eyedrops were administered to the right eye. During follow-up, neovascularizations disappeared and IOP was well controlled. Conclusions: NVG with ocular ischemia in SVCS should be considered as a possible cause of high IOP in SCLC patients. J Korean Ophthalmol Soc 2012;53(9):1346-1351
단안 부등시성 약시의 약시 치료 전후 다국소시유발전위 검사결과
전지훈,경성은,Ji Hoon Jeon,MD,Sung Eun Kyung,MD,PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.12
before and after occlusion treatment. Methods: The mfVEP was performed using RETIscanⓇ (Roland,Brandenburg, Germany) for patients with unilateral anisometropic amblyopia before and after occlusion treatment. Amplitude and latency values of mfVEP were analyzed according to the field divided by 6 rings or 4 sectors. Results: The each amplitude of values of all 6 rings were not significantly different before treatment (p = 0.077) in amblyopic eyes. However, the value of ring 1 (p = 0.00) was significantly higher than the value of other rings after treatment. In fellow eyes, the values of ring 1 was consistently significantly higher than the value of other rings before (p = 0.014) and after (p = 0.049) occlusion treatment. Additionally, the amplitudes of ring 1 (p = 0.005) and ring 3 (p = 0.007) were significantly increased in amblyopic eyes after occlusion treatment. In fellow eyes, the values of all rings did not change significantly. The analysis of amplitudes with 4 sectors revealed no significant result. The analysis of latencies with 6 rings and 4 sectors revealed no significant result. Conclusions: The change in amplitude on the central field (ring 1) in amblyopic eyes can be a useful objective monitoring method observing the improvement progress in visual acuity.
프리마운팅 탄성구조를 적용한 고속철도 제동디스크의 열구조 해석
전지훈(Ji Hoon Jeon),이호용(Ho Yong Lee),김민수(Min Soo Kim) 한국도시철도학회 2022 한국도시철도학회논문집 Vol.10 No.1
일반적으로 제동디스크는 제동과정 동안 가열과 냉각을 반복하여 열에 의한 피로손상이 발생한다. 제동과정에서 핫 스팟 및 높은 열응력이 마찰면과 체결부 주위에 발생하고, 디스크의 상하부면에 작용하는 제동 패드의 접촉력이 달라 마모량의 차이가 발생한다. 본 논문에서는 이러한 문제점들을 개선하기 위해 일반 화물차와 같은 상용차량 제동디스크의 프리마운팅 탄성구조를 고속철도 차량 제동디스크에 적용하여 위의 문제들의 개선방안을 제안하였다. 기존 철도 차량의 솔리드(Solid) 제동디스크와 프리마운팅 탄성구조 제동디스크에 대한 유한요소모델을 구성하고, 다이나모 시험조건을 적용하여 해석 모델을 구성하여 해석을 진행하였다. 최종적으로 해석 결과를 비교분석하여 제안된 탄성구조 방법에 대해 해석적으로 검증하였다. In general, brake disks cause fatigue damage due to heat by repeating heating and cooling during the braking process. During the braking process, hot spots and high thermal stress occur around the friction surface and the fastening part. And the contact force of the braking pads acting on the upper and lower surfaces of the disk is different, resulting in a difference in the amount of wear. In this paper, a structure for improving the above problems is proposed by applying a pre-mounting elastic structure of a braking disk of a commercial vehicle to a brake disk of a high-speed railway vehicle to improve these problems. A finite element model is configured for a solid brake disk and a pre-mounting elastic brake disk of an existing railway vehicle, and an analysis model is developed in which a dynamo test method is applied as an analysis condition. Finally, the analysis results are compared and analyzed to verify the proposed structure analytically.
전지훈 ( Ji Hoon Jeon ),박대원 ( Dae Won Park ) 대한내과학회 2017 대한내과학회지 Vol.92 No.4
The Third International Consensus Definitions for Sepsis and Septic Shock (SEPSIS-3) task force assessed the latest pathophy-siological parameters associated with sepsis and septic shock and defined sepsis as life-threatening organ dysfunction caused by a dysregulated host response to infection. This SEPSIS-3 definition may be applied using relevant clinical and biological criteria in-cluding changes in the Sequential Organ Failure Assessment score and serum lactate levels. The new definition does not include cri-teria for systemic inflammatory response syndrome or the concept of `severe sepsis.` The SEPSIS-3 definition aims to devise more precise descriptions of sepsis and to improve clinical care. However, there are important questions relating to the clinical applica-tion of the new definition. We review the main characteristics and limitations of previous definitions and discuss some of the poten-tial controversies raised by the new framework. (Korean J Med 2017;92:342-348)
황주성,전지훈,이영규,이충민,박민지,김현희,Hwang, Ju-Seong,Jeon, Ji-Hoon,Lee, Young-Kyu,Lee, Chung-Min,Park, Min-Ji,Kim, Hyun-Hee 대한물리치료과학회 2015 대한물리치료과학회지 Vol.22 No.1
Purpose : The purpose of present study was to improve communication of pain expressing terms and pain intensity between patient and physical therapist, and initiated to objectify a measurement of subjective pain. Methods : Data were delivered to 249 people by a self-completion questionnaire, and analyzed 160 copies except for 87 mark error of the collected 247 questionnaires. The questionnaire included a question on 55 terms used to describe pain, the type of the pain, and pain intensity using VAS (visual analogue scale). Results : The results were as follows; 'Tight' was the most frequently being expressed term of muscular pain, subsequently to 'knot' and 'dull'. 'Tear' was the term representing the most strong pain of muscular pain, subsequently to 'rupture' and 'squeeze'. 'Stinging' was the most frequently being expressed term of neurologic pain, subsequently to 'get shocked' and 'wriggle'. 'Burn' was the term representing the most strong pain of neurologic pain, subsequently to 'sear' and 'get shocked'. 'Creak' was the most frequently being expressed term of joint pain, subsequently to 'peel' and 'out of joint'. 'Break' was the term representing the most strong pain of joint pain, subsequently to 'peel' and 'crack'. Conclusion : The objectification of pain terms will be used to help physical therapist to check the patient's pain.
이상민(Lee, Sang-Min),전지훈(Jeon, Ji-Hoon),이창우(Lee, Chang-Woo),서정도(Suh, Jung-Do),장훈(Chang, Hoon),김세훈(Kim, Sae-Hoon),이성호(Lee, Sung-Ho),황운봉(Hwang, Woon-Bong) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Mechanical behavior in metal bipolar plate of a fuel cell stack was studied using finite element analysis. The fuel stack is essentially composed of a metal bipolar plate (metal BP), a gasket, an end plate, a membrane electrolyte assembly (MEA), and a gas diffusion layer (GDL). It is important to maintain a suitable fastening force of Metal BP, because it influences the power efficiency of the fuel cell stack. After a gasket and a GDL are placed on the metal BP, the reaction force with the displacement is measured. The channel of metal bipolar plate is replaced by a simple geometrical plate. The results of FEM are similar to those of experiment. Therefore mechanical behavior in metal BP of a fuel cell stack can be estimated by using FEM.
강유전체 BiFeO<sub>3</sub>가 증착된 TiO<sub>2</sub> 전극을 이용한 염료감응형 태양전지의 효율 향상
주호용,홍수봉,이호상,전지훈,박배호,홍성철,최택집,Joo, Ho-Yong,Hong, Su Bong,Lee, Hosang,Jeon, Ji Hoon,Park, Bae Ho,Hong, Sung Chul,Choi, Taekjib 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.3
Dye-sensitized solar cells (DSSCs) based on titanium dioxide ($TiO_2$) have been extensively studied because of their promising low-cost alternatives to conventional semiconductor based solar cells. DSSCs consist of molecular dye at the interface between a liquid electrolyte and a mesoporous wide-bandgap semiconductor oxide. Most efforts for high conversion efficiencies have focused on dye and liquid electrolytes. However, interface engineering between dye and electrode is also important to reduce recombination and improve efficiency. In this work, for interface engineering, we deposited semiconducting ferroelectric $BiFeO_3$ with bandgap of 2.8 eV on $TiO_2$ nanoparticles and nanotubes. Photovoltaic properties of DSSCs were characterized as a function of thickness of $BiFeO_3$. We showed that ferroelectric $BiFeO_3$-coated $TiO_2$ electrodes enable to increase overall efficiency of DSSCs, which was associated with efficient electron transport due to internal electric field originating from electric polarization. It was suggested that engineering the dye-$TiO_2$ interface using ferroelectric materials as inorganic modifiers can be key parameter for enhanced photovoltaic performance of the cell.