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코로나 방전을 이용한 이온풍의 특성분석 및 열전달 향상
이재일,황유진,주호영,안영철,신희수,이재근 대한설비공학회 2005 설비공학 논문집 Vol.17 No.11
An experimental study is conducted to investigate the characteristics of the ion wind generated by the electric field between a needle electrode and the parallel plate electrodes. The ion wind enhances heat and mass transfer between the surface and the surrounding gas. Moreover such enhancement makes no noise or vibration. This study is conducted to develop the electronic cooling device. The measured gas velocities and heat transfer coefficients are proportional to the applied voltage. The heat transfer coefficient can be increased as compared with a natural convection. The maximum enhancement of heat transfer obtained in this system is 47% for 3W in heat transfer rate.
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적외선 영상의 Salt-Pepper 잡음제거를 위한 적응 비선형 필터
이재일,김성환 대한전기학회 2006 전기학회논문지 D Vol.55 No.9(D)
- In this paper, detection based - adaptive windowed nonlinear filter(DB-AWNF) is proposed for removing salt-pepper noise in infrared image. This filter is composed of impulse detector and window-size-variable median filters. Impulse detector checks whether current pixel is impulse or not using range function and nonlinear location estimator. If impulse is detected, current pixel is filtered according to four kinds of local masks by use of median filter. If not, current pixel is delivered to output like identity filter. In qualitative view, the proposed could have removed heavy corrupted noise up to 30 % and reserved the details of image. In quantitative view, PSNR was measured. The proposed could have about 12 - 31[dB] more improved performance than those of median (3×3) filter and 13 - 29[dB] more improved performance than those of median(5×5) filter.
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이재일,윤현중,이상화 대한치과의사협회 2015 대한치과의사협회지 Vol.53 No.8
Cyst is a closed sac, having a distinct membrane and division compared to the nearby tissue. Most cysts in the oro-maxillofacial area are odontogenic origin and found most commonly by oral and maxillofacial surgeons. Enucleation is considered as a definitive therapy in the management of these cysts. However, to select the treatment method for large cyst, consideration of position of the cyst, size and accessibility to main structure are needed. Marsupialization is a minimal invasive technique to treat large odontogenic cyst and tumor without damage to adjacent important structures. This study was undertaken to describe three cases of odontogenic cysts and tumors of jaws that were successfully treated with enucleation after marsupialization.
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이재일,Beata Bia lek 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
We present the results of the electronic structure calculations for a copper tetraazaporphyrin (CuTAP) model monolayer, both bare and interacting with oxygen. The results are compared with those obtained for copper phthalocyanine. We have found that the CuTAP ferromagnetic configuration is preferred over the paramagnetic one. The calculated value of the magnetic moment of the Cu atom in the CuTAP monolayer is 0.54 µB. It does not affect strongly the magnetic properties of the monolayer, in which all but pyrrole nitrogen atoms remain unpolarized. The presence of oxygen molecules in the vicinity of the metallic center of the CuTAP causes a decrease in the magnetic moment of Cu, but does not much influence the overall magnetic properties of the monolayer. However, it influences slightly the ground-state electronic structure of the monolayer, mainly due to the charge transfer between the tetraazaporphyrin ring and the O2 molecules.
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Acute Gastric Dilatation in Rhesus (Macaca mulatta) and Cynomolgus (Macaca fascicularis) Monkeys
이재일,강병철 한국임상수의학회 2008 한국임상수의학회지 Vol.25 No.4
Acute gastric dilatation (AGD), one of the common causes of emergency occurs in macaca monkeys that are accommodated as laboratory-housed nonhuman primates. This report introduces some cases of occurrence in raising primates. The primates revealed an acute gastric dilatation, including the histories that were trained by monkey chair, anesthetized for the study or intact case. The clinical signs were comatose condition with sever abdominal distension, dehydration, cyanosis and apnea. One case died by deterioration of systemic body condition and performed necropsy. The other cases recovered from the AGD by the emergency treatment using the gastric tube and fluid therapy. Necropsy revealed the huge stomach filled with water, gas and ingesta. This report suggests that etiologic factors of AGD may include non-specific factors like these cases, with special emphasis on the incidence and management of AGD in nonhuman primates.
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