Park's 벡터 패턴의 왜곡률을 이용한 고정자 권선 고장 자동진단

宋明現(Myung-Hyun Song),朴奎南(Kyu-Nam Park),韓東奇(Dong-Gi Han),梁哲午(Chul-Oh Yang) 대한전기학회 2008 전기학회논문지 P Vol.57 No.2

In this paper, an auto-diagnosis method of the stator winding fault for small induction motor is suggested. 3-phase stator currents are sampled, filtered, and transformed with Park's vector transformation. After then Park's vector patterns are obtained. To detect the stator winding fault automatically, a distortion ratio is newly defined and compared with the one of healthy motor, and the threshold levels of distortion ratio are suggested. The 2-turn, 4-tum, 8-turn winding fault are tested with no load, 25%, 50%, 75%, and 100% rated load. The distortion ratio of the Park's vector patterns are increased as the increase of the faulted turns. but are same as the increase of the load.

捻轉法이 竝行된 鍼刺戟 및 電鍼刺戟이 鎭痛效果에 미치는 影響

Park, Dong-Seok,Kim, Ji-Hoon,Min, Byung-Il,Oh, Soo-Myung 경희대학교 동서의학연구소 1999 INTERNATIONAL SYMPOSIUM ON EAST-WEST MEDICINE Vol.1999 No.1

Dong-Seok Park¹, Ji-Hoon Kim¹ and Byung-Il Min, Soo-Myung Oh,³¹Department of Acupuncture and Moxibustion, College of Medicine, ²Department of Physiology, College of Medicine, And ³East-West Medical Research Institute, Kyung Hee University,Seoul, Korea. Analgesic Effect of Manual Acupuncture and Electroacupuncture combined with Twirling Method. Proceeding of International Symposium on East-West Medicine Seoul. 187-200, 1999.-Twirling the needle (TN) is one of several needing methods frequently used for acupuncture in the oriental medicine. The present study was conducted to see if TN enhanced the antinociceptive effect produced by plain-or electroacupuncture in the rat tail flick test. Rats (Sprague-Dawley, 200-300g)lightly anesthetized with thiopental sodium(40mg/kg, i.p.) were used in the tail-flick test. The basal reaction time for tail-flick was 2 sec. For "plain" acupuncture(PA), a needle was inserted for 20 min into a Chock-samni (ST36) acupuncture point which (is located at the anterior tibial muscle and about 10mm below the knee joint). For electroacupuncture(EA), train-pulses(3 Hz,0.3-ms pulse width, 0.2-0.3mA) were applied to the inserted needle for the period of insertion. For combining TN with either PA or EA, TN was performed during the each acupuncture period. Two methods for TN were used; twirling 3 times for 1 second persisted for 1 min in every 5 mins(long-duration and long-interval;LDLI) and twirling 3 times for 1 second persisted for 10 sec in every 1 min(short-duration and short-interval;SDSI). PA and EA produced an increase in tail flick latency (TFL); peak increases were 21.3±5.1% and 42.1±17.3% of the pre-acupunture control, respectively, and occurred immediately after cessation of 20min-acupuncture. Performing TN combined with PA increased TFL more than PA itself by showing a greater peak increase in TFL when performed with a SDSI-TN than with a LDLI-TN(60.6±12.5% and 42.7±22.7% of the pre-acupuncture control, respectively). Performing TN combined with EA also increased TFL more than EA itself and a greater peak increase in TFL was observed with a SDSI-TN as compared to a LDLI-TN(77.5±13.8% and 67.3±14.0% of the pre-acupuncture control, respectively). These results indicate that TN enhances both PA-and EA-produced antinociception where an greater enhanced antinociception than a LDLI-TN. It is suggested that performing a SDSI-TN combined with EA seems to be one of the most effective ways to produce analgesia.

유도전동기의 고정자 권선고장 진단을 위한 팍스벡터 패턴의 왜곡률 연산에 대한 연구

양철오(Chul-Oh Yang),박규남(Kyu-Nam Park),송명현(Myung-Hyun Song) 대한전기학회 2012 전기학회논문지 Vol.61 No.4

The diagnosis technique of stator winding faults based on Motor Current Signature Analysis(MCSA) was suggested. Park"s vector pattern, the circle that is drawn by d-q transformed currents(i_d, i_q), is widely used for stator winding faults detection. The current Distortion Ratio(DR), defined by the ratio of max?axis and min?axis of ellipse of Park"s vector"s pattern, was more simple and powerful method than the Park’s vector pattern. In this study, a calculation method of distortion ratio of Park"s vector pattern was suggested for auto diagnosis of stator winding short fault and usefulness of suggested calculation method of distortion ratio was verified through simulation using LabVIEW program.

토마토 엽 절편으로부터 식물체 재분화

오명규,이영만,박문수 全南大學校 農業科學技術硏究所 1997 農業科學技術硏究 Vol.32 No.-

조직배양에 의한 토마토의 효율적인 재분화 체계를 밝히고저 토마토 엽절편을 재료로 하여 배지 조성 및 품종간의 차이가 재분화에 미치는 영향을 조사하였다. 토마토 엽절편으로 부터 유기된 shoot수는 Calypso에서 27∼79개로 PI 134417에서의 1∼30개에 비하여 현저히 높았으며, MS배지에 IAA 0.02 ㎎/ℓ와 zeatin 2.0㎎/ℓ가 첨가된 배지에서 Calypso가 79개, PI 134417이 30개로 가장 양호하였다. 토마토의 재분화식물체 shoot의 발근은 MS기본배지에 IAA 0.02 ㎎/ℓ+ GA₃ 0.05㎎/ℓ+ AgNO₃ 10㎎/ℓ를 첨가한 배지가 40%로 가장 양호하였다. Effects of culture medium on the plant regeneration of tomato (Lycopersicon esculentum L.) using leaf segments were investigated to establish the efficient in vitro regeneration systems. Numbers of shoot differentiated from leaf explants were remarkably higher cv. Calypso of 275079 compared to that observed in PI 134417 of 1 to 30. Among tested culture media, MS medium supplimented with 2.0 ㎎/ℓ zeatin and 0.02㎎/ℓ IAA was the best resulting in with 79 shoots for cv. Calypso and 30 shoots for PI 134417. Among rooting media tested, MS basal medium added with 0.02㎎/ℓIAA, 0.05㎎/ℓ GA₃, and 10.0㎎/ℓ AgNO₃ gave rise to the best rooting frequency in vitro tomato roots.

GSIS를 이용한 소하천 경계경보 발령기준 설정 및 관리방안에 관한 연구

오명진,박재훈 경복대학 2004 京福論叢 Vol.8 No.-

최근 홍수피해의 문제점을 분석해 보면 기상 이변으로 집중호우가 발생하고 특히, 국지적인 호우에 의한 돌발홍수(flash flood)로 인한 피해가 빈번하게 발생하고 있다. 대하천의 경우에는 각 홍수 통제소에 의한 홍수 예·경보시스템(flood warning system)을 통하여 인명 혹은 재산피해는 과거에 비하여 상당히 감소하였으나 소하천에서는 반대로 피해가 증가하고 있는 실정이다. 본 연구에서는 하천 지역의 돌발홍수의 특성을 밝혀 보고자 지형공간정보(GSIS, Geo-Spatial Information System)기법을 이용하였으며, 하천 유역의 수문학적 돌발홍수 예측모형을 GIUH(geomorphoclimatic instantaneous unit hydrograph) 기법으로 구축하였다. 본 연구를 통하여 구축된 돌발홍수 예·경보 시스템을 통하여 하천 지역에 있어서의 인명 및 재산피해를 상당부분 감소시킬 수 있을 것이며, 다른 지역의 돌발홍수 예·경보 시스템구축을 위한 기초 자료를 제공할 수 있을 것이다. Recently, local heavy rain for a short term is caused by unusual changing in the weather. This phenomenon has, several times, caused an extensive flash flood, casualties, and material damage. In case of large river, the extent of loss of lives and properties has been decreased through the flood warning system by flood control stations. However, the extent of damages in other small rivers has increased to the contrary. This study is aimed at calculating the characteristics of flash floods in streams. For this purpose, the anslysis of topographical characteristics of water basin through applying GSlS techniques will be conducted. The flash flood prediction model we used is made with GIUH(geomorphoclimatic instantaneous unit hydrograph). As a result, we can suggest a rational warning criteria for the mitigation of flash flood damage and the reduction of the casualties as well as those for the decrease of property damage. Therefore, it will provide basic materials to establish a new flash food warning system, which can replace current system for other places.

시험관내에서 Superoxide Radical 생성과 Catalase 및 Superoxide Dismutase 활성도에 미치는 카드뮴의 영향

오명호,박정덕,정규철 중앙대학교 의과대학 의과학연구소 1987 中央醫大誌 Vol.14 No.2

Effect of cadmium on production of superoxide radical and activities of catalase and superoxide dismutase (SOD) in homogenates, cytosolic and mitochondrial fractions of liver, kidney and testis of rats was studied. Inhibition dose (I_50), concentration.of cadmium required for inhibition of the enzyme activity to 50% level, was calculated by probit method. Cadmium enhanced the production of superoxide radical in homogenate as much as 10.6, 1.3 and 2.8 times than control value in liver, kidney and testis, respectively, when cadmium concentrations ranged from 0.05 to 0.50 mM. Activity of catalase in homogenates was inhibited by addition of cadmium ranging from 0.1 to 50.0 mM. The I_50 of cadmium for catalase in homogenates of liver, kidney and testis were 18.86, 34.59 and 0.79 mM, respectively. Cadmium also inhibited the activities of Cu, Zn-SOD in cytosol fractions and Mn-SOD in mitochondrial fractions. The I_50 for Cu, Zn-SOD activity in cytosol fractions of liver, kidney and testis were 0.049, 0.118 and 0.030 mM, respectively, and for Mn-SOD activity in mitochondrial fractions were 0.905, 0.713 and 0.510 mM, respectively. In vitro inhibition of the enzyme activities by cadmium was dose-dependent. The inhibitory effect of cadmium on enzyme activities was most potent in testis suggesting that testis would be one of the most sensitive organs to cadmium.

金屬薄膜導波管을 利用한 I/O Mode Filter

박한규,오한솔,김명수 연세대학교 산업기술연구소 1981 논문집 Vol.13 No.2

代表的인 3종류의 金屬薄膜導波管의 TEo-Mode와 TMo-Mode의 특성을 Computer Simulation에 의하여 비교 고찰하였다. 非對稱型平板薄膜導波管으로된 금속박막도파관은 TEo-Mode Filtering이 不可能하였다. 對稱型平板薄膜導波管으로된 금속박막도파관에서는 Film층과 그 외의 층과 굴절율 차이가 0.02 이하가 되면 TEo-Mode Filtering이 가능하며 TMo-Mode 의 損失이 10dB/cm이하가 되어 Mode Filter로서 使用可能함이 밝혀졌다. The typical three kinds of the Metal-Clad waveguides have been chosen, and the characteristics of TEo-Mode and TMo-Mode in them are investigated and compared with each other by computer simulation. TEo-Mode filtering has been impossible in the Metal-Clad waveguide made of the symmetric thin film slab waveguide. In the Metal-Clad waveguide made of the symmetric thin film slab waveguide, if the refraction index difference between the film layer and the other layers is below 0.02, it has made TEo-Mode filtering possible and has had TMo-Mode loss below 10dB/㎝. Therefore it has been improved that it can be used practically as a Mode Filter.

Flowable Composite Resin의 미세변연누출 및 전단결합강도

박성준,오명환,김오영,이광원,엄정문,권혁춘,손호현 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.4

쌀밥 통조림의 製造工程에 따른 營養成分의 變動에 關한 硏究

朴性五,李明煥,李相圭 서울여자대학교 1980 서울여자대학논문집 Vol.- No.9

The average losses of nutrients during washing of three pure strains of rice prior to cooking on the process for production of canned rice have been found to be about thiamine 5%, riboflavin 17%, niacin 10%, calcium 9%, phosphorus 5%, phytin phosphorus 3%, iron 22%, available iron 29%, and nitrogen 2%. The average losses(over the loss during washing) of these nutrients in gruel of rice cooked with six volumes of water are thiamine 25%, riboflavin 28%, calcium 20%, phosphorus 13%, phytin phosphorus 11%, iron 24%, available iron 24%, and nitrogen 4%. These losses increase when the rice is cooked with 8 volumes of water and are 35%, 37%, 35%, 27%, 15%, 15%, 32%, 29% and 6% respectively. The retention of the nutrients in rice corresponds well with the values as calculated from loss of nutrients in the gruel. The loss of nutrients in rice cooked with just sufficient water is negligible.

소엽의 가용성 부탄을 분획이 인체 구강유상피암종세포에 미치는 항암효과

박명오,한두석 원광대학교 생체재료·매식연구소 1998 원광생체재료·매식 Vol.7 No.1

This study was evaluated to the antitumor effects of the n-butanol soluble fraction of methanolic extract of perilla frutescens on human oral epitheloid carcinoma cells(KB cells). The antitumor activity of various fraction obtained from n-butanol soluble fraction of perilla frutescens was evaluated in KB cells. The antitumor of the n-butanol soluble fraction in KB cells was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT assay), neutral red(NR assay) and sulforhodamine B protein (SRB assay) of colormetric assay methods. The light microscopic study was carried out to observe morphological changes of cultured KB cells. These results were obtained as follows; 1. MTT and NR quantities of fraction 4 were significantly decreased by MTT and NR assay. 2. SRB quantities of fraction 4 were significantly decreased (p<0.01) by SRB assay. 3. The number of cells were decreased, cell shapes were converted to round type. 4. The fraction 4 of the n-butanol soluble fraction of perilla frutescens showed the highest antitumor activity on perilla frutescens. It has been selected as a lead fraction for further examinations.