고려 엉겅퀴(Cirsium setidens Nakai) 잎 조직을 이용한 callus 배양 및 항산화 활성 검증

박정훈,심예지,박기임,이인순,문혜연 대구대학교 특수교육재활과학연구소 2010 産業技術硏究 Vol.21 No.1

We described the effects of antioxidant activity on the extracts of tissue and callus formation by Cirsium setidens Nakai. The callus culture were induced from leaf tissue of Cirsium setidens in both MS and B5 medium with IAA or/and kinetin (0∼5.0 ㎎/ℓ). As medium for callus culture induced from Cirsium setidens, B5 medium showed better condition than MS media. MS medium brought to decrease callus differentiation after formation, on the other hand B5 medium induced to accelerate callus differentiation. Among phytohormones is required 0.5 ㎎/ℓ of IAA and between 2.0 ㎎/ℓ and 1.0 ㎎/ℓ of Kinetin for formation of callus. In order to extract functional material from natural leaf and callus tissue of Cirsium setidens used distilled water and 75% ethanol as solvent and those extract used to determine antioxidant activity as alpha-diphenyl-2-picryl-hydrozyl (DPPH) radicals scavenging effect and TBA(thiobarbituric acid) activity. In result, the effect of DPPH and TBA had high activity more natural leaf extract than callus tissue and 75% ethanol was solvent better than distilled water. The 75% ethanol extract of natural leaf showed an excellent antioxidant activity because that particularly had highest concentration of vitamin C and total phenol among those extracts

O-링 테스터의 측정팁 구조개선

최기훈,여인철,김영탁 중앙대학교 미래신기술연구소 2001 미래신기술연구소 논문집 Vol.10 No.2

It is usual that the medical examination of human body need special knowledge and equipments. Thus we have to spend time and energy on going to special place such as hospital where doctors and equipment are. Which often cause missing a good chance of medical treatment as well as giving us inconvenience. However may simple and convenient equipments were developed for checking our health conditions recently. O-ring test is accepted as one of useful methods to examine our health conditions. Also the test is recognized as a useful means to judge if some medical substances or foods are beneficial or harmful to our health without any special equipment and medical knowledge. An automatic O-ring test machine has been developed[11]. However the tester have a problem that the pattern of applied force to the O-ring is different from that of manual case. In this study, the reaction force tip is modified and the validity of the tip is verified through experiments.

L - NAME 주입시 신 교감신경이 신혈류량 변화에 미치는 영향

민영기,양훈모,이석호,김종규 순천향의학연구소 2000 Journal of Soonchunhyang Medical Science Vol.6 No.2

Recently it is known renal medullar will be play a important role of blood pressure control and pressure natriuresis. Renomedullary antihypertensive mechanism is activated by increasing perfusion pressure of kidney and can be inhibited by sympathetic nerve stimulation or blockade of nitric oxide(NO) formation. It is important to know what is affect on renal regional blood flow, especially renal medullary blood flow(MBF). For the purpose of investigating the effect of the renal sympathetic nerve on regional blood flow during infusion of blocking NO synthesis(by N^(ω)-nitro-L-arginine methylester:L-NAME) in spontaneous hypertensive rat(SHR) and Wistar rats normal control, Mean arterial pressure(MAP), total renal blood flow(TRBF), midcortical blood flow(CBF), inner medullary blood flow were measured in innervated or denervated renal sympathetic nerve group of SHR and Wister rats. All group that received the L-NAME were seen increasing MAP while TRBF, CBF and MBF decreased and the decrease of TRBF in SHR is more marked than in Wistar rat. In spite of increasing the MAP, MBF in all four group decreased, respectively C: 220 ± 3 U, 205 ± 2 U Wi : 215 ± 4 U, 165 ± 12 U Wd :218 ± 3 U, 170 ± 10 U Si :195 ± 4 U, 98 ± 15 U Sd : 200 ± 3 U, 120 ± 14 U, especially the most remarkable decrease about 50 % in SHR innervated group. Thus, according to these result, NO seems to maintain the MBF and the partial interaction between renal sympathetic nerve and NO in medullary blood flow can be suggested in innervated SHR.

Gray-scale포토마스크를 사용한 마이크로구조물의 제작

성기훈 한양대학교 이학기술연구소 2003 이학기술연구지 Vol.6 No.-

본 연구에서는 포토마스크에 사용되어진 gray의 정도를 다르게 하여 쬐어주는 UV의 투과정도를 조절함으로써 multi-layer나 gradient를 가지는 마이크로구조물의 제작방법에 대하여 연구하였다. 이러한 방법은 multi-layer를 가지는 구조물을 제작하기 위한 여러 번의 마스크 얼라이먼트 과정을 거치지 않고 한번의 photolithography 작업으로 간단히 제작할 수 있을 뿐만 아니라 일반적인 photolithography에 의해 제작이 불가능한 연속적인 높이를 가지는 마이크로구조물을 제작할 수 있는 장점을 가지고 있다. I report a one-step fabrication method of 3D microstructure with multi-layer and continuous gradient using gray scale photomasks, which modulate the lights intensity according to their levels of gray. This method is very simple and flexible, and uses a mormal photo-film material as photomask, leaking to a very low cost mask technology.

설갑상선 : 1 예 보고 A Case Report

한기석,배일헌,차상훈,김성진,박길선 충북대학교 의과대학 충북대학교 의학연구소 2003 忠北醫大學術誌 Vol.13 No.2

갑상선 조직 전체가 설기저부에 발생한 이소성 설갑상선 증례를 경험하였기에 그 방사선학적 소견을 문헌고찰과 함께 보고하고자 한다. 증례는 59세 여자 환자로 40 일전부터 발생한 음성 변화를 주소로 내원하였다. 이학적 검사에서 설 기지부 중앙에 회백색의 격막에 둘러 쌓인 3 cm 가량의 종괴가 있었으며, 종괴는 내장으로 돌출하여 구인두를 막고 있었다. 경부 전산화 단층촬영 측면 정찰 촬영에서, 설 기저부에 후방으로 돌출하여 구인두를 막고 있는 경계가 분명한 연부조직 종괴가 보였으며, 전산화 단층촬영 동맥기와 정맥기에 주변의 혈관과 비슷한 강하고 균일한 조영증강을 보이는 장경 2.5 cm의 원형 종괴가 있었다. 또한 갑상선이 있어야 할 경부 전방 공간에서 정상 갑상선 조직은 전혀 보이지 않았다. 설 기저부의 종괴에서 생검을 시행하였으며 병리 검사에서 갑상선 조직으로 진단되어 설갑상선으로 확진되었다. The authors report a case of ectopic thyroid that whole thyroid tissue was replaced by lingual thyroid. A 59-year-old female presented with dysphonia duration of 40 days. On physical examination, there was a 3 cm sized well encapsulated whitish mass protruding to oral cavity in milline of tongue to base. Computerized tomography of neck revealed homogeneously enhancing well marginated 2.5 cm sized round mass in the cecum of tongue base on arterial and venous phase. And there was no normal thyroid gland in lower anterior neck.

침전법에 의한 알루미나 분말제조 Ⅲ. 소결체의 열적·기계적 특성

임헌진,이홍림,이형직,홍기곤 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.1

A precipitation method was adopted in order to prepare high-tech Al₂O₃ceramics. Al₂(SO₄)₃·18H₂O was used as a starting materials and alumimum hydroxides were obtained by single precipitation method at the pH condition 7 and 11, using NH₄OH as a precipitation agent. Fine Al₂O₃powders were prepared at optimum calcination condition and were sintered at 1650℃ for 4 h in air. Microstructures and mechhanical properties of Al₂O₃ceramics were investigated. Doped MgO limited the grain growth of Al₂O₃and increased grain size homogeneity of Al₂O₃Flexural stregth values were 340∼430 MPa. Critical temperature difference?? was 175 K showing rapid strength degradation by thermal shock.

O-링 테스트의 정량화에 관한 연구

최기훈,여인철,김영탁 중앙대학교 생산공학연구소 2000 생산공학연구소 논문집 Vol.9 No.2

신체의 건강진단을 위해서는 값비싼 장치의 전문지식이 요구된다. 따라서 장비를 갖춘 병원과 같은 특정 장소에서 전문지식을 가진 의사를 만나기 위해 시간과 노력을 들여 이동해야만 한다. 그러나 최근에는 간단하게 진단을 할 수 있는 장치가 개발되어 있다. 0-링 테스트는 특별한 장치가 없이도 간단한 지식으로 건강진단 및 약물이나 음식물의 이해 여부를 판단할 수 있는 유효한 진단방법으로 인식되고 있다. 하지만 이 테스트 법은 검사자의 경험과 주관에 의존하므로 결과에 대한 신뢰성과 객관성이 문제시되고 있다. 본 연구에서는 0-링 테스트 시스템을 고안하여 테스트결과가 객관적이고 정량적으로 나타나도록 하여, 손쉽게 결과를 판단 할 수 있게 하고자 한다. It is usual that the medical examination of human body need special knowledge and equipments. Thus we have to spend time and energy on going to special place such as hospital where doctors and equipments are. Which often cause missing a good chance of medical treatment as well as giving us inconvenience. However many simple and convenient equipments were developed for checking our health conditions recently. 0-ring test is accepted as one of useful methods to examine our health conditions. Also the test is recognized as a useful means to judge, without any special equipment and medical knowledge, if some medical substances or foods are beneficial or harmful to our health. However, the judgement may be incorrect because it depend on doctor's subjective point of view. In this study, we developed an automatic 0-ring test machine which enable us to check our health conditions objectively and quantitatively. The validity of the idea to develope the machine was proved by experiments.

기흉 후 발생한 뇌동맥 공기 색전증 : 1예 보고

배일헌,한기석,차상훈,김성진,박길선,홍장수 충북대학교 의과대학 충북대학교 의학연구소 2003 忠北醫大學術誌 Vol.13 No.2

뇌혈관내 공기 색전증은 뇌혈관 조영술, 혈관내 도자술 시행시 발생하여 매우 심각한 합병증을 유발할 수 있다. 그러나 기흉의 합병증으로 발생한 경우는 보고된 적이 없다. 저자들은 기흉에 의하여 발생한 뇌혈관내 공기 색전증 1예를 경험하였기에 보고한다. Cerebral arterial air embolism is a potentially fatal event that may occur during the cerebral angiography and intravascular catheterization. The CT findings of cerebral arterial air embolism following pneumothorax have not been reported. We report a case of cerebral arterial air embolism following pneumothorax, and describe the CT findings.

폐혈관상이 유지된 선천성 낭성 선종양 기형

배일헌,한기석,차상훈,김성진,박길선,이건국,홍장수 충북대학교 의과대학 충북대학교 의학연구소 2003 忠北醫大學術誌 Vol.13 No.2

선천성 낭성 선종양 기형은 태생 16주 이후 말단세기관지의 형성이 중단되어 미성숙기관지들과 중배엽성분들이 과도하게 증식하여 발생하는 드문 선천성 폐질환이다. CT소견은 낭종의 크기 숫자, 내용물 등에 따라 다양하나, 병변내에 정상적인 폐혈관이 보인 예는 전세계적으로 보고된 적이 없었다. 저자들은 역동적 흉부 CT상 균일한 저음영의 병변내에 정상 폐혈관상이 유지된 선천성 낭성 선종양 기형 1예를 경험하였기에 보고한다. Congenital cystic adenomatoid malformation(CCAM) is a rare pulmonary disease that is thought to be developed by abnormal proliferation of immature alveoli and other mesenchymal component from the abrupt halting of the terminal alveoli formation after 16 weeks of gestation. On CT scan, there are no consistencies regarding to size, numbers, and its contents but no cases were reported in past showing normal pulmonary vascularities. We reports a case of CCAM that showed normal pulmonary vascularities within the hypodense lesions on a dynamic chest CT

비등방성 확산 필터와 형태학적 처리를 이용한 역하프토닝

고기영,주동현,염동훈,김두영 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.8 No.2

Digital Halftoning convert a continuous-tone images to a binary images. Inverse halftoning addresses the problem of recovering a continuous image from a halftoned binary image. Simple low pass filtering can remove the high frequency noise but it also removes the edge information. Thus the edge information should be separated from the halftoning noise. As a result, the edge of result image is blurring. This paper present that we obtain continuous-tone-image which using Anisotropic diffusion filter. To reduce noise without blurring the edges of reconstructed image use edge map. The experimental result show that proposed method gives a higher PSNR and better subjective quality than conventional methods. As a result, the edge information of reconstructed image reduce blurring.