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신예원 ( Yewon Shin ),이민규 ( Mingyu Lee ),이홍경 ( Hongkyung Lee ) 한국공업화학회 2022 공업화학전망 Vol.25 No.4
With the growing popularity of battery-powered mobility, battery safety and performance reliability have been prioritized by battery industries. Despite advanced manufacturing processes of large-scale commercial Li-ion cells, “latent defects” that can accidentally appear due to imbalanced battery design, invisible faults, and extreme operating conditions still threaten performance degradation and battery fire. Hence, it is urgently necessary to detect such latent defects in advance and understand the impacts of cell parameters and operating conditions on the battery failure scenario. For straightforward analysis of commercial cells, real-time, non-invasive visualizing of battery inside and diagnosing battery aging have been recognized through in-operado battery imaging technology based on X-rays, neutrons, and ultrasound which can penetrate the active materials, cell components, and external packaging. Moreover, a battery imaging technique to visualize the current distribution pattern using a magnetic field induced at batteries under external current load has also been proposed. This review will comprehensively discuss the imaging techniques inside the battery from atomic and molecular levels in electrode materials and interfaces to macro-scale battery systems, and examine qualitative case studies and recently unveiled phenomena.
접시형태양열 시스템을 이용한 2단계 열화학 싸이클의 수소 생산
신예원(Yewon Shin),김태준(Taejun Kim),오상준(Sangjun Oh),서태범(Taebeom Seo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this study, chemical reactor was designed to be used for operating with dish type solar thermal system. Scaled-up device, performance verified on hydrogen production in laboratory scale experiment, was tested by dish type solar thermal system in field. In the result, various conditions of experiment device and chemical reactor were studied for system operating in the field to cycle repetition. Lab scale ferrite-conversion rate were 24~76%. 5-times sequential 2-step water splitting cycles were performed in this experiment. Ferrite-conversion rate were formed from 4.49 to 29.97% and hydrogen production rate were formed from 0.19 to 1.54 mmol/g-ferrite.
접시형 태양열 집광 시스템을 이용한 열화학 사이클의 수소생산
권해성(Haesung Kwon),신예원(Yewon Shin),오상준(sangjune Oh),서태범(Taebeom Seo) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The two-step water splitting thermochemical cycle is composed of the T-R (Thermal Reduction) and W-D (Water Decomposition) steps. The reaction temperature necessary for this thermochemical cycle can be achieved by a dish-type solar thermal collector. The purpose of this study is to validate a water splitting device in the field. The validation results show that the foam device, when loaded with NiFe2O4/m-ZrO2 powder, was successfully achieved hydrogen production with 9 repeated cycles under field conditions. Two foam device used in this study were tested for validation before an experiment was performed. The lab scale ferrite-conversion rate was in the range of 24~76%. Two foam devices were designed to for structural stability in this study. In the results of the experiments, the hydrogen percentage of the weight of each foam device was 6.145 and 6.228 NL/(kg·h) on average, and the conversion rates 4.49~29.97 and 2.55~58.83%, respectively.
수치모델을 이용한 자동차 헤드램프 내부의 습기발생 현상 해석 연구
고만석(Manseok Ko),정영국(Youngguk Jung),조현석(Hyunseok Cho),신예원(Yewon Shin),서태범(Taebeom Seo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Increasing styling features for automotive headlamps speed up the focus of understanding condensation at inner surfaces. Water vapor condensation on the inside surface of the headlamp lens is an essential factor that affects secure front view and headlamp life. One of the headlamps of automobile which is one of the most popular in Korea was chosen for the present analysis. In the basis of the experimental data of automobile given by a manufacturer, boundary conditions were defined and free convection of the air inside the headlamp and radiation from the bulb to the other surfaces are considered. As a result, temperature distribution of the inside surface of the headlamp lens are approximately the same as the experimental result.