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FEM과 CFD 연동을 통한 스택 체결 시 압력에 의해 변형된 단위 전지 해석
유빈,임기성,주현철 한국수소및신에너지학회 2021 한국수소 및 신에너지학회논문집 Vol.32 No.4
Polymer electrolyte membrane fuel cells (PEMFC) are currently being used in various transport applications such as drones, unmanned aerial vehicles, and automobiles. The power required is different according to the type of use, purpose, and the conditions adjusted using a cell stack. The fuel cell stack is compressed to reduce the size and prevent fuel leakage. The unit cells that make up the cell stack are subjected to compression by clamping force, which makes geometrical changes in the porous media and it impacts on cell performance. In this study, finite elements method (FEM) and computational fluid dynamics (CFD) analysis for the deformed unit cell considering the effects of clamping force is performed. First, structural analysis using the FEM technique over the deformed gas diffusion layer (GDL) considering compression is carried out, and the resulting porosity changed in the GDL is calculated. The PEMFC model is then verified by a three-dimensional, two-phase fuel cell simulation applying the physical properties and geometry obtained before and after compression. The detailed simulation results showed different concentration distributions of fuel between the original and deformed geometry, resulting in the difference in the distribution of current density is represented at compressed GDL region with low oxygen concentration.
공황 장애 환자에서 Venlafaxine Extended-release의 치료 효과와 안전성
유빈,김찬형,Ryu, Vin,Kim, Chan-Hyung 대한불안의학회 2006 대한불안의학회지 Vol.2 No.1
SSRIs have been considered as the first line of treatment for patients with panic disorder since 1990s along with cognitive behavioral treatments. High potency benzodiazepines (e.g. alprazolam, clonazepam) have had advantages in anti-panic effects. However, these drugs have limitations of treating panic disorder because of their dependency, tolerance and withdrawal. Serotonin and noradrenaline reuptake inhibitors (SNRIs) such as venlafaxine were introduced as antidepressants since 1990s. Recently, it is confirmed that SNRIs have the remarkable anti-panic effects although some concerns about its cost, tolerance, withdrawal, side effects such as dry mouth, constipation, and hypertension have emerged. In this regard, further study is required to confirm the efficacy of long term treatment of panic disorder. Despite these concerns, venla-faxine extended-release is an effective treatment in patients with panic disorder.
유빈,김진이,조현상 대한우울조울병학회 2008 우울조울병 Vol.6 No.1
Objectives:Pharmacotherapy is efficacious for acute treatment of bipolar disorder, but still limited for the relapse prevention. Early detection of relapse and its management have been included as one of major strategies in recent psychosocial treatments of patients with bipolar disorder. The detection of manic prodromes can be useful for the early intervention. The aim of this study was to interview and report on prodromal symptoms in a recent manic episode. Method:43 euthymic bipolar patients were interviewed about a variety of their prodromes of manic states, with open questions and a prodrome checklist. Results:All of the subjects could detect the prodromes of mania and their prodromal symptoms were diverse. Most common manic prodromes were the symptom of decreased need for sleep and more talkative observed in 75% of the bipolar subjects. Some patients reported depressive symptoms in the initial prodromal period. Conclusion:Bipolar subjects reported a variety of and diverse prodromal symptoms of manic episode. Psychosocial treatments, especially including education for early detection of manic prodromes and programs for their proper management will be needed for relapse prevention.