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공랭식 VRF시스템을 적용한 다중 수조의 온도 정밀 제어
정광주(Kwang Ju Jeong),장규상(Kyu Sang Jang),김기원(Ki Won Kim),최동규(Dong Kyoo Choi),김평진(Pyeong Jin Kim),김영일(Young Il Kim),김선혜(Sean Hay Kim) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
In this study, we applied the multiple control technique to the constant temperature water control, effectively cooling the two constant temperature water baths and controlling them with the final electric heater. The temperature difference of the water bath with VRF and electric heater can be maintained within the same small range as the conventional water bath with a water cooling chiller and electric heater. One VRF system using multiple control technique can not only operate two water baths simultaneously, but also reduce the power consumption by 85.7% at the SP 15℃, 20℃, 25℃.
3D BiVO<sub>4</sub>/ZnO photoanode for solar water splitting at low bias potential
정민재,남성경,김기원,문준혁 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Here, we prepare the photoanode of the BiVO<sub>4</sub>/ZnO three-dimensional (3D) structure. ZnO has a relatively cathodic flat-band potential, which leads to low turn-on potential. We achieve remarkably high charge separation efficiency at low bias potential. As a result, the BiVO<sub>4</sub>/ZnO 3D photoanode generates a high water oxidation photocurrent of up to 3.4 ± 0.2 mA cm<sup>-2</sup>. We observe that the photocurrent-to-O<sub>2</sub> conversion efficiency is over 90%.
권영배,정영찬,권중기,손지선,김기원 대한약리학회 2009 The Korean Journal of Physiology & Pharmacology Vol.13 No.6
Intracranial headaches, including migraines, are mediated by nociceptive activation of the trigeminal nucleus caudalis (TNC), but the precise mechanisms are poorly understood. We previously demonstrated that selective blockage of spinal sigma-1 receptors (Sig-1R) produces a prominent antinociceptive effect in several types of pain models. This study evaluates whether the Sig-1R antagonist (BD1047) has an antinociceptive effect on capsaicin (a potent C-fiber activator) induced headache models in rats. Intracisternal infusion of capsaicin evoked pain behavior (face grooming), which was significantly attenuated by BD1047 pretreatment. BD1047 consistently reduced capsaicin-induced Fos-like immunoreactivity (Fos-LI), a neuronal activator, in the TNC in a dose-dependent manner. Moreover, capsaicin- induced phosphorylation of N-methyl-D-aspartate receptor subunit 1 was reversed by BD1047 pretreatment in the TNC. These results indicate that the Sig-1R antagonist has an inhibitory effect on nociceptive activation of the TNC in the capsaicin-induced headache animal model.