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지/단락실증시험에서 MW급 계통연계형 ESS 절연/보호시스템 성능 분석에 관한 연구
김진태,이승용,박상진,차한주,김수열,Kim, Jin-Tae,Lee, Seung-Yong,Park, Sang-Jin,Cha, Han-Ju,Kim, Soo-Yeol 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.2
With recent ESS (Energy Storage System) fire accident, the fault protection performance is becoming more important. However, there has never been any experiments with the protection performance on the faults in the ESS system level. In this study, the effect of AC ground fault and IGBT (Insulated Gate Bipolar mode Transistor) short-circuit failure on MW class ESS was performed experimentally for the first time in the world. First of all, the effect of the AC single line ground fault on battery was analyzed. Moreover, the transient voltage was investigated as a function of the battery capacity and the power level. Finally, the breaking capability and insulation performance of ESS were examined under PCS short-circuit fault condition. Through the tests, it was found that ESS protection system safely blocked the faulty current regardless of the faults, whereas the electronic parts such as IGBT and MC (Magnetic Contactor) were broken by the fault current. Also, the electrical breakdown in ESS resulted from the transient voltage during the protection process.
Divinyl Sulfone으로 가교된 히알루론산 마이크로비드의 특성평가
김진태,이득용,장주웅,김태형,장용운,Kim, Jin-Tae,Lee, Deuk Yong,Jang, Ju-Woong,Kim, Tae-Hyung,Jang, Yong-Wun 대한의용생체공학회 2013 의공학회지 Vol.34 No.3
Hyaluronic acid(HA) microbeads were synthesized by dropping the sodium hyaluronate(Streptococcus) solutions in NaOH into a solution mixture of divinyl sulfone(DVS) in 2-methyl-1-propanol, followed by stirring, cleaning and drying process at room temperature. The initial experimental conditions are crosslinking time(CLTi) of 5 h, crosslinking temperature(CLTe) of room temperature, injection air pressure(IAPr) of 5 psi, and DVS concentration( DVSc) of 0.2 vol%, respectively. Then, parametric studies were performed by varying the parameters to investigate the morphology, the porosity, the swelling ratio and the size of the beads. The microbead size pattern was not regular to function of the degree of crosslink. It was observed that the swelling ratio, the degree of crosslink, and the pore size can be controlled by adjusting the CLTi, CLTe and DVSc. Among the parameters investigated, the smallest bead size can be achieved by varying the CLTi parameter. The lowest swelling ratio, as an indication of the highest degree of crosslink, can be obtained by varying CLTe.
웅예선숙 식물인 갯기름나물(식방풍)의 개화 특성 및 세대촉진 방법
김진태,조호준,유홍섭,박영상,김지석,정용혁,양태진,Jin Tae Kim,Ho Jun Joh,Hong Seob Yu,Young Sang Park,Ji-Seok Kim,Yong Hyeok Jeong,Tae-Jin Yang 한국자원식물학회 2023 한국자원식물학회지 Vol.36 No.4
본 연구는 갯기름나물의 개화특성 및 수정능력을 파악하여 육종의 기초자료로 이용하고자 수행되었다. 개화기 관찰 결과, 소화서 내 소화들은 바깥쪽에서부터 중앙쪽 방향으로 5일의 시차를 두고 개화하였다. 단일 소화는 웅예선숙형 특성을 가지며 개화와 더불어 화분은 5일간 유지되었고, 자예는 개화후 8일차 부터 발달하여 13일까지 임성을 유지하였다. 화분은 웅예출현 직후 2일째에 활력이 대폭 증가하였지만 하루만에 급감하였다. 동일화서 내 자가수정능력을 확인한 결과, 일부에서 자식성종자를 결실하였고, DNA 마커에 의해 자가수정 개체임이 확인되었다. 개체내 분지는 주경을 기점으로 영양상태에 따라 최대 4차지경까지 분지되며, 지경 화서 간 평균 8일 동안 자예 활성, 화분 활력시기가 중복되어 다른 가지의 화서간 자가수정이 가능하다고 판단된다. 노지에서 생육 후 12월 말까지 춘화처리 된 개체들을 12월 말에 온실내에서 생식생장을 유도하고 5월에 채종함으로써 개화시기를 약 4개월정도 단축시킬 수 있었다. 채종한 종자는 5~6월에 파종하고 영양생장 후 12월 말까지 춘화처리 후 5월에 채종할 수 있어 기존2년 1세대 육종기간을 1년 1세대로 단축할 수 있었다.
김진태,조명철,전국진,박광호,허종기,Kim, Jin-Tae,Cho, Myung-Chul,Jeon, Kug-Jin,Park, Kwang-Ho,Huh, Jong-Ki 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.2
Impacted third molars of the mandible are generally found at or close to the second molar. If the third molar is impacted far distant from its original site, it may be affected by cysts or tumors. Ectopic impaction of third molar in the condyle area is very rare. Furthermore, impaction without cystic lesion is even less common. The etiology of migration of the mandibular third molar without cystic lesion is unknown. So periodical X-ray taking is essential.
김진태,이준하,Kim, Jin-Tae,Lee, Jun-Ha 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.1
짧은 바깥쪽 탄소 나노튜브를 가진 이중벽 탄소 나노튜브 공진기의 경우, 자유로운 끝은 긴 안쪽 벽의 진동에 중요한 역할을 한다. 짧은 안쪽 탄소 나노튜브를 가진 이중벽 카본 나노튜브 공진기의 경우, 안쪽은 부드러운 코어로 작동하여 기본 주파수가 이들의 길이에 의해 영향을 받는다. 본 논문에서는 서로 다른 길이를 가지고 나노튜브로 구성된 이중벽 탄소 나노튜브 공진기의 주파수 변화를 분석한다. 분석 결과, 안쪽 혹은 바깥쪽 탄소 나노튜브 길이를 제어하는 다양한 주파수 소자를 구현하는데 널리 응용될 수 있을 것으로 판단된다. For a double-walled carbon nanotube resonator with a short outer nanotube, the free edge of the short outer wall plays an important role in the vibration of the long inner nanotube. For a double-walled carbon nanotube resonator with a short inner nanotube, the short inner nanotube can be considered as a flexible core, thus, the fundamental frequency is influenced by its length. In this paper, we analysis frequency variation in ultrahigh frequency nanomechanical resonators based on double-walled carbon nanotubes with different wall length. This results will widely apply to the realization of frequency devices controlling the length of the inner or outer nanotube.
김진태,이계한,Kim, Jin-Tae,Lee, Gye-Han 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.5
Flow visualization technique incorporating photochromic dye is used to study the flow characteristics of the gravity driven laminar wavy film. The film thickness and wave speed are successfully measured by flow visualization. As the inclination angle increases, the waves have higher peaks and lower substrate thickness. The measured cross stream velocity at the free surface is up to 10% of stream wise velocity, which shows enhanced mixing in the lump of the film. The measured stream wise velocity profiles are close to parabolic profile near the substrate and the peak but show significant velocity defect near the rear side of the wave. The measured wall shear rate distributions show good agreement with the previous workers' numerical results.
알루미노 실리케이트계 지오폴리머의 압축강도에 미치는 알카리 활성화제의 영향
김진태,서동석,김갑중,이종국,Kim, Jin-Tae,Seo, Dong-Seok,Kim, Gab-Joong,Lee, Jong-Kook 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.3
Portland cement has been restricted in applications to ecological area because of its environmental harmfulness and the $CO_2$ emission during a production process. Geopolymer materials attract some attention as an inorganic binder due to their superior mechanical and eco-friendly properties. In this study, geopolymer-based cement was prepared by using aluminosilicate minerals (flyash, meta-kaolin) with alkaline-activators and its compressive strength with concentration of alkaline-activators was investigated. Aluminosilicate-based geopolymers were obtained by mixing aluminosilicate minerals, alkaline solution (NaOH or KOH with different concentration) and water-glass under the vigorous stirring for 20 min. Compressive strength after curing at $30^{\circ}C$ for 3 days increased with the concentration of alkaline-activator due to the enhanced polymerization of the aluminosilicate materials and dense microstructure. Aluminosilicate-based geopolymer cement using KOH as an alkaline-activator showed high compressive strength compared with NaOH activator. In addition, geopolymer cement using fly-ash as a raw material showed higher compressive strength than that of meta-kaolin.
알루미노실리케이트계 지오폴리머의 압축강도에 미치는 물유리의 영향
김진태,서동석,김갑중,이종국,Kim, Jin-Tae,Seo, Dong-Seok,Kim, Gab-Joong,Lee, Jong-Kook 한국재료학회 2010 한국재료학회지 Vol.20 No.9
Geopolymer is a term covering a class of synthetic aluminosilicate materials with potential use in a number of areas, but mainly as a replacement for Portland cement. In this study, geopolymers with fly ash and meta kaolin were prepared using KOH as an alkali activator and water glass. The effect of water glass on the microstructures and the compressive strength of the geopolymer was investigated. As the amount of water glass increased, the dissolved inorganic binder particles in the geopolymers increased due to polymerization, resulting in a dense microstructure. The meta kaolin-based geopolymer showed a better extent of polymerization and densification than that of the fly ash-based geopolymer. XRD data also suggested that polymerization in meta kaolin-based geopolymers should be active resulting in the formation of an amorphous phase with an increasing amount of water glass. The compressive strength of the geopolymer was also dependent on the amount of water glass. The compressive strength of the geopolymers from both fly ash and meta kaolin increased with an increasing amount of water glass because water glass improved the extent of polymerization of the inorganic binder and resulted in a dense microstructure. However, the addition of water glass to the geopolymer did not seem to be effective for the improvement of compressive strength because the meta kaolin-based geopolymer mainly consisted of a clay component. For this reason, the fly ash-based geopolymer showed a higher value of compressive strength than the meta-kaolin geopolymer.