유체로 연성된 동일한 두 직사각 평판의 고유진동 해석

유계형,정경훈,이성철 한국산업안전학회 2002 한국안전학회지 Vol.17 No.2

In order to investigate the vibration characteristics of fluid-structure interaction problem, we modeled two identical rectangular plates coupled with fluid. A commercial computer code, ANSYS was used to perform finite element analysis and FEM solutions were compared with the experimental results to verify the finite element model. As a result, comparison of FEM and experiment showed good agreement, and the transverse vibration modes, in-phase and out-of-phase, were observed alternately in the fluid-coupled system. The effect of fluid gap size on the fluid-coupled natural frequency were investigated. It was shown that the mode numbers increased, the normalized natural frequencies monotonically increased. And it was also found that an increase of the fluid gap reduced the coupled natural frequencies for the in-phase modes but increased the coupled natural frequencies for the out-of-phase modes, and eventually converged to the results of an infinite fluid gap.

유체에 잠긴 다공 직사각평판의 고유진동 해석

유계형,권대규,정경훈,이성철 한국산업안전학회 2003 한국안전학회지 Vol.18 No.1

This paper presented an experimental modal analysis of clamped perforated rectangular plates submerged in water. The penetration of holes in the plates had a triangular pattern with P/D(pitch to diameter) 1.750, 2.125, 2.500, 3.000 and 3.750. The natural frequencies of the perforated plates in air were obtained by the Rayleigh-Ritz method and compared with the experimental results. Good agreement was obtained between the analytical solution and experimental result. The experimental results in water showed that the mode shapes are not sensitive to the depth of submergence. The natural frequencies were shown to decrease drastically once the perforated plates come in contact with water. However, the natural frequencies decrease with the depth of submergence until a certain depth is reached, and become the asymptotic values beyond this depth of submergence. The depth of submergence did not affect the damping ratio greatly.

都市 住居環境의 外部空間改善을 爲한 硏究(Ⅱ) : 住居地域 담장에 대한 住居意識 및 現況分析 An Analysis of Residents' Feelings on Their Residences' Fences

嚴鵬勳,安啓福 효성여자대학교 새마을연구소 1985 새마을硏究論文集 Vol.5 No.-

In our residential areas, dull fences are one of the main factorswhich deteriorate the amenity of residential environment. The puropse of this study is to analyze the residents' fellings on thefences as a basic reference in improving the amenity of restdential environment. The analysis was performed with the data obtained by thequestionnaires. The main findings of the analysis are as follows. 1. Most of the existing fences are composed of cement blocks orbricks, reflecting that the residents regarded the purpose of fencesas a defensive aspect. 2. On the other hand, the necessity of the harmony with gardenand surrounding environment is fully appreciated. And hedges arethe most preferred materials, which are desirable in combinationwith gardens and surroundings as a greenery environment. 3. As a result of relationship study between respondents' charact-eristics and related variables, significant differences were found inmany variables by the education levels and age distribution ofrespondents. As it goes to highly educated and young respondents the satisfaction level was low and hedge type fences were preferred.This means the capability of changes in existing fences is consiaerablystrong. 4. The relationship analysis between each variables showed thatsatisfaction level has close mutual relationship with preferencein materials, type of fences ana harmony with gardens etc. Inconclusion, the open type hedges were considered to be the mostdesirable fences in our situation.

消渴屬腎에 關한 文獻的 考察

金聖勳,郭桂豪 大田大學校 1991 論文集 Vol.10 No.1

실업고등학교와의 교육과정 연계운영이 전문대 입시경쟁력에 미칠 영향에 관한 연구

崔桂浩,徐東薰 대구산업정보대학 1998 논문집 Vol.12 No.1

Educational courses at a vocational high school in connection with a junior college, effective on February 9, 1996 under the second educational reform bill, has been analysed to have great influence on junior college entrance examination competition. 1. This is shown from the analysis of target school's educational progress in connection with junior college courses and investigation into its current situation. According to the results, 4 model junior colleges and 79 curriculums at 13 self-regulated junior colleges expressed to take part in it. And 77 curriculums at 52 vocational high schools also built up a closer connection with it. The number of students, whom junior college will admit through a preferential selection test, amount to 2227. 2. According to a poll investigation, only 29.6% of vocational high school students answered they went there because of academic records. Among them, no more than 46.6% talked of school satisfaction. As for the educational courses linked with a junior college, 85.6% replyed they felt it is necessary. Only 4.5% felt it unnecessary. 95.5% of school personnel, who are working with a vocational high school or a junior college put emphasis on its necessity. 80.2% of them also answered that educational courses linking a vocational high school with a junior college would exert a great influence on a vocational high school. In conclusion, the educational at a vocational high school in connection with a junior college will exercise great influence on junior college entrance examiantion competition.

보행속력과 동작의 부드러움과의 상관관계에 관한 연구

탁계래,한영민,최진승,이정한,임영태,전재훈,박상균,박승하,Stefanyshin Darren 한국운동역학회 2006 한국운동역학회지 Vol.16 No.1

의회의 청원처리 기능에 관한 일고찰

이계훈 한국외국어대학교 사회과학연구소 2001 社會科學論集 Vol.18 No.2

腫瘍의 화학요법과 放射線療法의 副作用에 대한 韓方藥物療法

곽계호,김성훈,임낙철 대한동의병리학회 1995 동의생리병리학회지 Vol.9 No.2

연구배경 : 국내 질병에 의한 사망률중 암에 의한 것이 최상위를 차지하고 있으며 또한 그 비율이 점차 증가추세에 있다. 지금까지 국내외에서 암의 예방과 치료법에 대하여 대규모 연구가 진행되어 많은 함암제가 개발되었으나 여러 부작용이 나타나면서 최근에는 암의 치료를 극대화하면서 여러 항암치료의 부작용을 감소시키기 위한 생약 및 한약에 대한 연 구가 활발히 진행되고 있어, 저자는 향후한약을 이용한 실험연구와 임상에 기여하고자 제 관련 문헌을 정리 조사하여 보고하게 되었다. 방법 : 한의학에서의 연구동향과 암치료에 널리 활용되고 있는 화학료법 및 방사선료법의 부작용감소를 위한 한방약물료법에 관해 한의학의 중요서적과 잡지를 중심으로 정리하고 비교 고찰하였다. 결과 : 종양치료에 활용된 치법으로는 부정법(扶正法)과 거사법(祛邪法)으로 크게 나눌수 있는데 부정법에 활용된 약물로는 삼류와 백출, 황기, 복령, 감초, 자감초, 당귀, 백작약, 생지황, 숙지황 등의 약물이 선용되었으며, 거사약물로는 백화사설초, 반지련, 석상백외 18종 이 주로사용되었고, 종양치료에 실험 및 임상에서 유효하였던 처방은 화류탕등을 비롯 다 양한 처방이 면역 기능을 증강시켜 부작용감소 및 병용투여에서 상승효과를 나타냈다. To be helpful to the treatment of cancer with oriental medicine, we got clinical report together and analyzed the data. The results were obtained as follows; 1. The treating methods could be summarized as two methods that were reinforcing vital energy and eliminating harmful Qi; The methods of reinforcing vital energy were reinforcing spleen and increasing Qi; reinforcing spleen and harmonize stomach, aid virility and nourishing blood, nourishing stomach and incresing body fluid, reinforcing kidney and strength the basic energy, warmth kidney and aid virility. The other methods of eliminating poison were transforming pathological fluid and softening activating blood, transforming pathological blood, guiding Qi, take off and harmonize harmful body fluid, disperse Qi and dry the dampness, transforming pathological blood and harmonize moisture. 2. The oriental herbs used for reinforcing vital energy were Radix Ginseng, Codonops is Pilosulae Radix, Radix Pseudostellariae, Adenophorae Radix, Scrophulariae Radix, Astractylodis Macrocephalae Rhizoma, Astragali Radix, Poria, Gylcyrrhizae Radix, Angelicae Gigantis Radix, Paeonilae Radix Alba, Rehmanniae Radix and used for eliminating harmful Qi were Oldenlindiae Diffusae Herba, Herba Scutellariae Barbatae, Paridis Rhizoma, Verbenae Herba, Smilacis Chlnae Rhizoma, Radix Semiaquilegiae, Houttuynae Herba et. 3.The useful prescriptions used for cancer therapy were Hwalyutang Yukmijihwangtang, Yonghosinchonghwan, Bokbangkyokolamtang, Yikki-sojeungbang, Samchobujeonhangamchungjye and Bokbangkyokolamtang, Yikksojeungbang were reported to be effective in immunodulatory reaction and Bokbangsamsahapjye, Sibjeondaeboang, Gagyulpijukyeotang, Hwayebokwontang showed the combined treatment with anticancer drug was effective and Hangamlyeong(抗癌靈) was effective for pain caused by cancer. 4.The useful antitumor effective prescriptions in experimental investi-sation were Yikikeonbihabjye, Keon biiksinchungjye, Bisinbang, Sankyeol pyeolpyeon, Hangamdanhyeokkeombokbang, Janglyupyeong, HangamIIho, Keonbiyikitang, Yikkiisojingbang, Sakunjatang, Bokbanggyongkyejusayek, Bujeonghangambang, Bokbangjungyakjusayek, Yukmijihwangtang, Samchobujeonghangamchungjae, Samkijusayek, Yikkiyanghyeolbowonkyonang, Samyongtang-Bojungikkitang, Soyinibo-jungikang among them Bisinbang, keonbiiksinchungjye, Janglyup-yeong, Keonbiyikitang, Yikkisojingbang, Yukmijihwangtang, Keumku-esinkihwan were showed antitumor effect by regulate immunity function. 5. The main treatment for the side effect by chemotheraphy was reinforcing Qi, spleen and harmonize stomach and Omisodokyeum, Hyangsaynkkunjatang, Yijintang, Kamlosodokdan, Silbiyeum, Hageojye-johwan, Sibjeondaebotang, Olyeongsan, Sobanhakaboklyeongtang, seung-baektang, Bisinbang, Keonbiyiksinbang, Sambaekdangjang, Bokbang-samsahabjye, Keonbiyikitang, Janganseungbaekchungjye, Kobonkeoe I ho, Bokihwawejikubang, Bokbangsaenghyeolyeng, Keonbiyikkibosinbang, Hwangbaekhabjye, Yukkunjatang, Seonbokdaejatang, Bangdoktang, Hwangjeongomibang, seunghyeoltang, Kilpijukyetang, Sakunjatang, Yikkibohy-eolkeonbitang, Kangyeoktang,Samkijusayaek, Bujeongseungbaektang, Yukmijihwanghwan, were suggested for the side effect by chemotheraphy. 6. The main treatment for the side effect by radiotheraphy was increasing Yin and clarifying heat, Sasammaekmundongtang, Boyeum-jeon, Maekmundongyeum, Dangkwibohyeltang, Paljintang, Bowontang, Yukkunjatang, Pyeongwesan, samintang, Kwakrakhalywongtang, Cheon-keumwekyeongtang, Sohamhamhyungtang, Paljeongsan, Sokyeoyeumja, Kalkeunkeumlyeongtang, Yeonlitang, Yilkwanjeon Oklyeojeon, Yukmijihwangtang, Hwangiyeontang, Hwanglyeonhaedoktang, Yangyeumcheongpyeoko, Yidongko, Chuliko, Cheongpyeotang, Jayeumkanghwatang, Hangbiyinam I ho, Hangbiyinam II ho, Hangbiyinam III ho, Hangbyinam IV ho, Jukyeoseokkotang, Samsatang I ho, Samsatang II ho, Samsatang, Bokbanggsaenghyeollyeng, Bujeongsaengjintang, Yikkiyangyeumbang, Sinlibpyeon, Sakunjatang, Sakunjatang, Kobonyik-kitang, keoehaedoktang, Bujeongjeunghyohabjye, were suggested for the side effect by radiotheraphy. 7. The useful prescription for the side effect by chemotheraphy and radiotherapy in experimental investigation were Hwangbaekhabjye, Sakunjatang, Yikkibohyeolkeonbitang, Bujeongsaengjintang, Samchobu

위상배열 초음파를 이용한 터빈 블레이드 루트부내 결함평가 기법 연구

조용상,정계조,박상기,김재훈 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.2

초음파검사는 재료의 표면 또는 내부에 존재하는 불 연속부를 검출하기 위해, 초음파를 재료에 전달시켜 검사하는 비파괴검사법의 일종이다. 이러한 일반 초음파검사 방법 및 일반 결함평가 방법은 복잡한 현상에서 반사되는 신호로부터 결함을 구분하기가 어려워 결함의 평가 및 검사결과에 신뢰성이 떨어지고 있는 실정이다. 따라서 이러한 crack성 결함의 발생 가능성이 높으나 기존의 초음파검사 방법으로는 결함 판별에 어려움이 있는 설비에서의 검사방법 및 결함평가 방법의 제고가 필수 불가결한 실정이다. 본 연구에서는 위상배열 초음파를 사용하여 크랙 검출능력이 높고 길이 평가가 가장 정확한 방사각도를 규명하고, 주요발전설비중 하나인 터빈에 적용하였다. 기존의 초음파 검사 방식이 아닌 위상배열 초음파를 이용하여 결함의 크기를 평가할 수 있는 신 기법 및 이를 이용하여 터빈 블레이드 루트부 내에 존재하는 미세 결함에 대하여 크기평가 방법 및 결함탐지 방법에 대하여 고찰하였다. Ultrasonic testing is a kind of nondestructive test to detect a crack or discontinuity in materials or on material surfaces by sending ultrasound to it. This conventional ultrasonic technique has some limitations in reliably detecting crack or accurately assessing materials in the case of complex-shaped power plant components such as a turbine blade root. An alternative method for such a difficult inspection is highly needed. In this study, application of a phased array ultrasonic testing (UT) system to a turbine blade, one of the critical power plant components, has been considered, and the particular incident angle has been determined so that the greatest crack detectability and the most accurate crack length evaluation may be achieved. The response of ultrasonic phased array was also analyzed to establish a special method to determine the crack length without moving the transducer. The result showed that the developed method for crack length assessment is a more accurate and effective method, compared with the conventional method.

GIS를 위한 홍수유출해석에 관한 연구

박준일,함계운,성오경,장영태,김경훈 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-

In the rainfall-runoff simulation, it is crucial problem to extract the hydrologic topographical factors that are used as the model input parameters. Those factors are drawn out from DEM(Digit a1 Elevation Model) along with GIS(Geographic Information System) techniques represent a wide range of topographical informations. GIS is employed to estimate the parameters and examine application. Also, the results from different GIS data and analysis methods are examined. In the study, spatial data are calculated using WMS(Watershed Modeling System) v.6.1, which is hydrologic analysis software coupled with GIS, and flood analysis is accomplished by HEC-1 included in WMS, and applied to Dukchon River basin. To calculate the effective rainfall CN values of NRCS are used. Clark, Snyder and NRCS methods are selected to derive unit hydrograph respectively. In addition, the characteristics of runoff responses according to the selection of GIS spatial data for NRCS CN, TIN or Grid used to extract hydrologic topographical informations. and the number of partitioning sub-basin are investigated.