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한국개비자(Cephalotaxus koreana)의 Harringtonine 과 Homoharringtonine에 관한 연구
이연,박두천,박호일,주우홍,이현채,신동수 昌原大學校 基礎科學硏究所 1996 基礎科學硏究所論文集 Vol.8 No.-
한국산 개비자로부터 alkaloid계통의 성분인 harringtonine과 homoharringtonine의 혼합물을 추출하여 한국산 개비자의 잎, 줄기, 뿌리에서의 harringtonine과 homoharringtonine의 함량은 고속 액체 크래마토그래피에 의해 결정하였다. 두물질의 함량은 서식지, 식물의 부위에 따라 상이하였다. Harringtonine의 함량은 줄기보다 잎과 뿌리에서 높았고, homoharringtonine의 함량은 harringtonin 함량보다 낮았다. 팔공산, 덕유산, 백양산, 지리산 및 남해에서의 잎의 homoharringtonine 함량은 줄기와 뿌리에서 높게 나왔으며, 조계산과 진도에서는 잎의 함량이 뿌리와 줄기에서 보다 낮았다. Harringtonine and homoharringtonine known as anti-cancer agents were isolated from Korean native plumyew (Cephalotaxus koreana). The contents of harringtonine and homoharringtonine in the needles, stems, and roots of Korean native plumyew were determined by high performance liquid chromatography (HPLC). The contents of both compounds varied with the site of location and the part of plant. The content of harringtonine was higher in needles and roots than in stems, whereas the content of homoharringtonine was lower than harringtonine. Homoharringtonine contents in needles at Mt. Palgong, Mt. Dukyu, Mt. Baekyang, Mt. Jiri, and Namhae were higher than in stems and roots. But homoharringtonine contents in needles at Mt. Jokye and Jindo were lower than in stems and roots.
誘導電動機의 驅動을 위한 負荷轉流型 인버터에 관한 硏究
소용철,이우춘,정연택 明知大學校 産業技術硏究所 1991 産業技術硏究所論文集 Vol.10 No.-
Investigation of the driving range of the induction motor which is operated by using a load commutated inverter has been carried out in this paper. It is shown that capacitance of the commutation capacitor can be reduced by the forced-com-mutation driving up to a half range of normal frequency in the low frequency in the low frequency range when to start the motor drive.
문상돈,김연직,임익태,박찬우 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
As a technology to machine the 3-dimensional shapes of general metal material more flexibly, machining technologies such as metal cutting, grinding, etc have been steadily improved in their accuracy as well. However, the working method using machining technologies are restricted in terms of surface roughness, metal working accuracy and working hours, if a workpiece has an irregular 3-dimensional shape. Magnetic abrasive finishing process is also one of the super-precision machining technologies which proceed with the finishing metal working of precision working piece using the action of magnetic field and the mixed type magnetic abrasive. However, such studies only focus on the improvement of machining accuracy but are still incomplete in investigating the roundness. This study aims to realize the high accuracy finishing machining focusing on the roundness after magnetic abrasive finishing process of circular workpiece and the surface roughness of precision machining surface.
진정법을 이용한 치과치료 시 편도선의 크기가 행동에 미치는 영향
김현지,백광우,마연주,정영정 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.3
본 연구에서는 진정법을 이용한 치과치료에서 소아환자의 편도선 크기가 진정법 중 환자의 행동에 미치는 영향을 평가하기 위해 진정법으로 치과치료를 받은 소아환자 35명의 진정기록지를 분석하였다. 진정법은 chloral hydrate 50 mg/kg, hydroxyzine 1 mg/kg를 경구투여하고, 치료 중 50% 아산화질소-산소 흡입 진정 및 필요에 따라 midazolam의 점막하투여(0~0.3 mg/kg)를 병행하는 방법으로 시행되었으며, 편도선의 크기는 Brodsky 분류법을 이용하여 4그룹으로 분류하였다. 환자의 진정 기록지를 분석하여 다음과 같은 결과를 얻었다. 1. 진정법 중 행동 반응은 수면, 움직임, 울음, 전반적 행동 모두에서 편도선 크기가 클수록 낮은 지수(negative behavior)를 보였다(p<0.05). 2. 편도선의 크기는 진정법 중 구호흡과 유의한 연관성을 보였으나(p<0.05), 진정법 중 코골이, 기침과는 유의한 연관성을 보이지 않았다(p>0.05). 3. 편도선의 크기가 큰 환자일수록 midazolam의 점막하투여량이 유의하게 증가하였다(p<0.05). The purpose of this study was to evaluate the effect of children's tonsil size on the behavior during pediatric dental sedation. The sedation records of thirty five children were examined in this study. All the sedations had been performed using chloral hydrate/hydroxyzine, nitrous oxide/oxygen or/and submucosal midazolam, and the subjects were divided into 4 groups according to their tonsil size using Brodsky's tonsil classification. The results were as follows: 1. The patients with enlarged tonsils showed negative behaviors in all behavior rating aspects(sleep, movement, crying, overall behavior) during sedation than those with normal tonsils(p<0.05). 2. Enlarged tonsils were correlated with mouth breathing(p<0.05) but not with snoring and coughing(p>0.05) during sedation. 3. For the patients with enlarged tonsils, significantly higher doses of midazolam were administered during sedation than for those with normal tonsils(p<0.05).
[P426] Hair follicle nevus developed on the toe
( Yong-yon Won ),( Seung-hee Loh ),( Dong-woo Suh ),( Bark-lynn Lew ),( Woo-young Sim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Hair follicle nevus(HFN) is a rare, congenital hamartoma typically presents as a solitary, asymptomatic, nondescript papule, plaque, or nodule frequently on the face in the distribution of the first branchial arch. HFN shows follicular differentiation characterized by numerous tiny mature hair follicles with thickening of the perifollicular fibrous sheath set in a fibrotic stroma histologically. An admixture of eccrine, sebaceous and muscular components is occasionally seen. A 65-year-old male visited our clinic for longitudinal nail ridge with slight brownish colored pigmentation on the right great toe nail without any history of trauma. After nail plate extraction of his toe nail, we found a rice-head sized skin-colored, subcutaneous nodule spanning nail bed and matrix. A complete excision of the tumor was performed. Histopathological examination revealed numerous tiny vellus hairs with several keratin filled cysts. A slight deformity of the nail plate occurred after the operation, but the longitudinal ridge disappeared and there was no recurrence of the lesion even after 6 months. HFN usually occurs at birth and in areas with a lot of hair follicles, especially on the face. However, the lesion of this case was found in adult, although the onset of the lesion is not clear, and developed over nail bed and matrix that had never been reported. Therefore, we report a case of HFN occurred on the toe in adult for these interesting points.