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Spatial Hole Burning 모델에 기초한 매립형 Laser Diode의 Kink에 대한 연구
임종형,한영수,김상배 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.6
A kink due to the lasing of the first transverse mode in laser diodes is investigated using rate equations based on the spatial hole burning model. An analytic expression for the kink power is derived and the result agrees well with experimental results. It is also shown that the position of a kink can be identified in the electrical derivative characteristics as well as in light output vs, current characteristics.
Recent Development of Transition Metal Oxide Based Aqueous Supercapacitor Electrode Materials
임종형(Jong Hyeong Lim),조혁래(Hyeokrae Cho),정용재(Yong-jae Jung),노종욱(Jong Wook Roh),신원호(Weon Ho Shin) 한국세라믹학회 2021 세라미스트 Vol.24 No.2
With the development of electric devices such as smart phones or electric vehicles, energy storage systems with high energy/power density and stable operation need to be developed together. The supercapacitors using aqueous electrolyte have great potential for electrochemical energy storage system due to their high power densities and long cyclic performances. The state-of-the-art materials for supercapacitors are carbon based porous materials having high specific surface areas and electrical conductivities. However, they have relatively low energy density that still need to enhance specific capacitance by using the nanostructure of transition metal oxide (TMO) materials. The TMOs store charge through redox reactions like battery systems and their rates are comparable to those of conventional electrochemical double-layer capacitors. In this review, we describe the fundamental principle of TMO based supercapacitors and the recent progress for realizing high performance of TMO based supercapacitors. In addition, we categorize the TMO system as single cation and mixed cations and suggest the prospects for electrochemical energy storage fields.