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Carbon Nanotube-based Flexible Thermoelectric Materials and Devices
Kwang-Suk Jang(장광석) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Flexible thermoelectric devices can be potentially used for flexible cooling and energy harvesting from nonflat heat sources and human body heat. However, the development of flexible thermoelectric materials with excellent thermoelectric performances is still very challenging. In this presentation, a simple, cost-effective, and scalable solution process is reported for the fabrication of flexible high-performance thermoelectric carbon nanotube-based hybrid films. Flexible thermoelectric generators with the hybrid films for an efficient energy harvesting from the vertical temperature difference are also reported.
장운용(Un-Yong Jang),정광석(Kwang-Seok Jung),박대원(Dae-Won Park),길경석(Gyung-Suk Kil),박성주(Sung-Ju Park) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
This paper presented surge protective method and devices for shipboard electrical and electronics devices. Parallel type surge protective devices (SPD) for the 440 [V] and a series type SPD for the 220 [V] rated voltage were designed and fabricated. The performance were evaluated by an un-powered test which applies the 8/20 [㎲] surge current Lip to 10 [㎄]. The maximum clamping voltage of the parallel and the series type SPD were 1,032 [V] and 875 [V], respectively.
장운용(Un-Yong Jang),김선재(Sun-Jae Kim),정광석(Kwang-Seok Jung),차현규(Hyeon-Kyu Cha),길경석(Gyung-Suk Kil),류길수(Keel-Soo Rhyu) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
This paper described the application and the field test of Light emitting diode (LED) lamp to shipboard. LED is a good light source especially for shipboard lighting because of its compact structure which makes water a kind explosion proof, anti-vibration. Also, LED has many advantages such as high efficiency, low power consumption, fast response, environment-friendly, and longer lifetime in comparison with the conventional lamps. In this study, a 40 [W] LED light panel which replace a 20 [W]~40 [W] fluorescent lamp (FL), and a 8.5 [W] LED lamp which replace a 20 [W] fluorescent and a 60 [W] incandescent lamp (IL) were installed in rooms of a ship. The installation effect showed an energy saving of 56 [%]~86 [%] and an illumination increase of 150 [%]~290 [%] compared with the existing light.
장광석(Kwang-Seok Jang),심기철(Ki-Chul Sim),이재욱(Jae-Uk Lee),이홍표(Hong-Pyo Lee),조명석(Myung-Suk Cho) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
The purpose of this study is to reduce the quantities of the isolators for optimization of nuclear power plants base isolation system. To solve this problem, increase the horizontal stiffness of the device over the performance improvement of the existing low hardness rubber, and decreases the quantity of devices through the division of lead-core. In order to optimize the APR1400’s base isolation system, finite element analysis was performed to examine the multi-lead rubber bearing which is improved the single lead rubber bearing. The proposed division of lead plug can reduce the quantity of devices through in this study. Accordingly possible to secure economic efficiency of the seismic isolation system, and is also expected to be effectively managed in the maintenance.
슬라이딩 소재의 마찰 특성 분석 및 면진받침 적용성에 관한 실험적 연구
박진영 ( Park Jin Young ),이종석 ( Lee Jong Suk ),이봉춘 ( Lee Bong Chun ),장광석 ( Jang Kwang Seok ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
The sliding materials for bridge supports are used to ensure the seismic performance or to absorb thermal deformation of bridge decks. The sliding plates in the bridge-bearings directly transfer vertical loads and horizontal displacements to piers. To construct bridge economically, bridge-bearings are required to endure higher vertical load capacity. Therefore, smaller and stiffer sliding materials have been being developed to improve vertical loading capacity of bearings. In this study, friction coefficient tests were accomplished with the sliding materials applied for bridge bearings. Three different types of friction materials (PTFE, C-Lube, and UHMWPE) were tested with equivalent compressive stress, velocity, and displacement respectively. Based on the experimental results of each material, the horizontal stiffness and energy dissipation capacities of bearings were compared and analyzed through the design of the friction pendulum bearing as well.