KAERI 부지 주변의 환경선량 측정을 위한 온라인 감마선량 감시시스템

이정호,박두원,이원윤,이현덕,최용호,김삼랑,홍광희,이창우 대한방사선 방어학회 1994 방사선방어학회지 Vol.19 No.2

환경감마선량 변동을 감시하기 위해 한국원자력연구소 부지 주변에 온라인 감마선량 감시망을 구성하였다. 모니터링 포스트에 설치된 전리함 검출기에 의해 측정된 자료는 무선전송방식으로 중앙통제소에 전송되어 실시간으로 감시된다. 무선전송 방식은 자료의 전송, 처리 및 자자에 신뢰도가 높고 경제적이었다. 감시시스템은 급격한 선량증가시 조기경보체제와 연결할 수 있게 하였다. On-line gamma monitoring system around KSERI-site was set up to monitor the radiation fluctuations in environment. Data on gamma exposure rates measured by the ionication chamber in the monitoring posts are transmitted to a computer of central control station with radio telemetry transmission and reliable on handing and storing of data. This monitroing system can triger an early warning system in the event of abnormal radiation levels.

급성 심근허혈에 의해 윤발된 승모판 폐쇄부전의 기전에 관한 실험적 연구

강덕현,송현,송재관,김현숙,이재환,임희영,이재원,박성욱,박승정,송명근 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.8

열적 변화를 이용한 실내환경 가스의 분류

최낙진,심창현,송갑득,주병수,이윤수,이상문,이덕동,허증수 한국센서학회 2002 센서학회지 Vol.11 No.5

단일 기판위에 온도측정용 Pt 박막과 Pt 히터 그리고 가스 감지를 위하여 순수한 SnO_2 박막과 Pt가 첨가된 SnO_2박막을 설계하고 제작하였다. 제작된 소자는 실내환경가스인 이산화탄소, 프로판 그리고 부탄의 분류에 응용되었다. 동작 온도를 가변하기 위하여 히터의 입력 전압을 사다리꼴로 인가하면서 SnO_2 감지막의 반응특성과 실내환경가스들에 대한 분류여부를 조사하였다. 감지막 반응특성곡선에서 여러 변수들을 추출한 후 주성분분석(principal component analysis : PCA)을 통하여 가스 분류 특성을 검증하였다. Two SnO_2 based sensing films(pure SnO_2 and SnO_2/Pt) and a Pt thin film for temperature sensor on an alumina substrate were designed and fabricated for classifying the indoor environmental gases. By controlling the heating power in the shape of trapezoid, unique four sensing response curves created from both SnO_2 film and SnO_2/Pt film. Then, various parameters were extracted from sensing response curves and carried out principal component analysis(PCA). The results confirm that a sensor array with the proposed operating mode was extremely effective in classifying indoor environmental gases such as CO_2, C_3H_8, C_4H_10.

조구등(釣鉤藤)의 4-VO로 유발한 흰쥐뇌허혈에 대한 신경방어효과

李仁煥,林康鉉,李鍾錫,石庚浩,安德均,朴虎君,김頀哲 대한본초학회 1999 大韓本草學會誌 Vol.14 No.2

Uncariae Ramulus et Uncus(UR, ???) has sweet in flavour and slightly cold in property, acting on the liver and pericardium channels. This drug was described in a medical classic as having the ability to remove "heat", check hyperfunction of the liver and relieve dizziness, tremors, and convulsion, and subdue "endogenous wind". So this study was planned to check the neuroprotective effect of UR on the global ischemia induced by 4-vessel occlusion in Wistar rats. and UR extract was lyophilized after extraction with 70% methanol. We induced 4-vessel occlusion for 10 minutes and reperfused again. The number of CA1 pyramidal neurons were counted after 7 days of reperfusion under the cresyl violet staining. In 4-VO ischemia model, UR showed significantly neuroprotective effects(1,000 and 500 ㎎/㎏ of UR extracts, p<0.05) compared with control group. Each neuroprotective ratio was about 23.0%, 19.0% respectively. Consequently, Uncariae Ramulus et Uncus has neuroprotective effects on the global ischermia induced by 4-vessel occlusion in Wistar rats. So we expect that Uncariae Ramulus et Uncus can be used as a drug for neurodegenerative disease.

방해석의 복굴절에 의한 편광

李原鎭,成德鏞,全永基,申再鉉 대구산업정보대학 1998 논문집 Vol.12 No.2

It was investigated the variation of polarization by the double refraction of light for a calcite crystal. In a calcite there is a single direction called the optics axis, which is an axis of symmetry with respect to both the crystal form and the arrangement of atoms. For a point in calcite, there are three principal sections, one for each pair of opposite crystal faces. A principal section always cuts the surfaces of a calcite crystal in a parallelogram withe angles of 71˚ and 109˚. When a beam of plane-polrized light is directed along the optic axis of calcite crystal, the plane of polarization turns steadily about the direction of the beam and emerges vibrating in some other plane than that at which it entered. The law of Malus is ralationship how the intensity transmitted by the analyzer varies with the angle that its plane of transmission makes with that of the polarizer. The pane polarization, θ was obtained from the law of Malus was 20.2˚

杜仲과 木瓜의 混合 煎湯液이 흰쥐의 卵巢摘出로 유발한 骨多孔症에 미치는 影響

李鍾安,盧昇鉉,安德均,崔湖榮 대한본초학회 2001 大韓本草學會誌 Vol.16 No.1

The purpose of this study is to examine the effects of Eucommiae Cortex and Chaenomelis Fructus on the aged ovariectomized rat, similar model with postmenopausal osteoporosis. The results of the experiment are as follows, 1. The body weight in OVX/ECCF group showed a increase.. 2. The level of S-AST and S-ALT in OVX/ECCF group significantly reduced. 3. Urinary volume and creatinine in OVX/ECCF group reduced.. The level of urinary deoxypyridinoline in OVX/ECCF group fignificantly reduced. According to the above results, this experiment indicates that OVX/ECCF group stimulated born formation and diminished the loss of born marrow, then recovered the failure of liver function on ovariectomized rat. In conclusion, an extract of Eucommiae Cortex and Chaenomelis Fructus showed preventive and curing effects in treating osteoporosis of ovariectomized rats. This result suggests that it can be used in preventing senile and postmenopausal osteoporosis. As for its effects, continuous clinical study is needed.

급성 심근경색후 생존심근 진단에서 Dobutamine 심초음파도와 Thallium 심근스캔의 정확성 비교

이근,강덕현,송재관,이철환,최기준,홍명기,김재중,박성욱,박종훈,박승정 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.2

고에너지 전자빔투사방법으로 제조된 (CrB, MoB)/탄소강 표면복합재료의 경도와 내마모성

이규홍,남덕현,이성학 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.3

The present study is concerned with the improvement of hardness and wear resistance in (CrB, MoB)/ carbon steel surface composites fabricated by high-energy electron beam irradiation. Three kinds of powder mixtures, i.e., 5OCrB-50MgF₂(flux), 5OMoB-50MgF₂, 25CrB-25MoB-50MgF₂ (wt.%), were placed on a plain carbon steel substrate, which was then irradiated with electron beam. In the specimens fabricated with flux powders, the surface composite layer of 0.8-1.3 mm in thickness was successfully formed without defects, and contained a large amount (up to 48 vol.%) of Cr_(1.65)Fe_(0.35)B_(0.9) or Mo₂FeB₂ in the martensitic matrix. The hardness and wear resistance of the surface composite layer were directly influenced by hard borides, and thus were about 3 to 7 times greater than those of the steel substrate. Particularly in the surface composite fabricated with CrB and MoB powders, the wear resistance was most excellent because the hardness of the cell boundary region and martensitic matrix was very high and because borides were connected to form a network structure along cell boundaries. (Received January 19, 2005)

SnO₂/TiO₂후막형 습도센서의 제조 및 특성

이건동,이재현,박효덕,이덕동,최흥문 경북대학교 센서기술연구소 1991 센서技術學術大會論文集 Vol.2 No.1

SnO_(2) doped with TiO_(2) and other activating agents, is used as a raw material to prepare humidity sensors. SnO_(2) is an n-type semiconductor whose resistance is described as a function of relative humidity. SnO_(2)/TiO_(2) thick film humidity sensors have been fabricated by using typical silk screen printing techniques. The humidity sensitivity of SnO_(2)/TiO_(2) thick film has been investigated. And the sensing characteristics of the fabricated SnO_(2)/TiO_(2) sensors such as resistance change and response time, has been investigated from R.H.20 % to 90 %. Experimental results show that the impedance-humidity characteristics of the humidity sensors depend on the microstructure of surface roughness and pore size distribution.

황금(黃芩)의 4-VO로 유발한 흰쥐뇌허혈에 대한 신경방어효과

李秉哲,林康鉉,金榮玉,金善礪,安德均,朴虎君,金護哲 대한본초학회 1999 大韓本草學會誌 Vol.14 No.2

Scutellariae Radix(SR), the root of Scutellaria baicalensis G_EORGI, whose property, flavour and channel tropism is bitter in flavour, cold in property(寒), acting on the lung, gallbladder, stomach and large intestine channels(歸?,?,?,大??), has the effects of clearing away heat and dampness(淸熱??), purging fire, detoxicating(?火解?), stopping bleeding(止血) and preventing miscarriage(安?). This drug is one of the popular drugs in traditional Korean medicine, which has been used to antipyretic, antibacterial, antitoxic and antihypersensitive effects. So this study was planned to check the neuroprotective effect of SR on the global ischemia induced by 4-vessel occlusion in Wister rats. and SR extract was lyophilized after extraction with 70% methanol. We induced 4-vessel occlusion for 10 minutes and reperfused again. The number of CA1 pyramidal neurons were counted after 7 days of reperfusion under the cresyl violet staining. The result obtained that in 4-VO ischemia, SR showed significantly neuroprotective effects(1,000 and 500 ㎎/㎏ of SR extracts, p<0.05) compared with control group. Each neuroprotective ratio was about 27.4 %, 23.2 % respectively. Consequently, Scutellariae Radix has neuroprotective effects on the global ischemia induced by 4-vessel occlusion in Wistar rats.