Sedimentation Rate and Transport Features of Suspended Matter in the Changjiang Estuary and Adjacent Continental Shelf

윤정수,박상운,고윤영,오윤근 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-

The study area is situated between 31˚00' ~ 33˚30' N and 122˚30' ~126˚00' E as a part of the East China Sea continental shelf. The distribution of sediment in the study area can be classified three sedimentary types. Modern land derived muddy sediments consisting of silt and mud are distributed at mouth of the Changjiang River. and are also observed the southwest offshore of the Cheju Island. The sandsilt-clay miadre sediments are presented in the outer shelf area. The relict sand are distributed between the mordern and mixture sediment. The inner-shelf mud consisted of 8.89% sand. 59.05% silt. 32.06% clay and mean size of 6.90Φ. The offshore mud composed of 5.83% sand. 34.54% silt. 59.63% clay and mean size of 8.32). and also have higher water content and organic carbon. The C/N ratio showed higher in the inner-shelf mud (10.14) rather than that of the offshore mud (8.68). Most of the Changiiang River suspended matter is entrapped in the area around the Changjiang Estuary to the west of 123˚30' E. Only a small part of the suspended matter can be moved by Changjiang Diluted Plume to the southeastern and northeastern middle shelf. The higher suspended matter concentration gradient zone are observed in the northwest central region, and this plume zone separated from Changjiang Estuary by a low oncentration of less than 5 mg/ l or 15 mg/ l. The sediment accumulation rate in the inner shelf mud deposit near the mouth of the Changjiang River is 1.70 cm/yr and characterized by physical stratified mud. The sedimentation rate in the offshore mud deposit to the southwest of Cheju Island shows 0.28 cm/yr and characterized by homogenous mud. The difference in fine-scale stratigraphy is explained by the ratio of mixing rate to accumulation rate, which is much larger for the offshore mud deposit (27.34) than for the inner shelf mud deposit (1.65). these larger ratio allows biological mixing to destroy physical stratification.

형질전환 담배 식물체에서 개똥쑥 Terpene Synthase의 발현

박성길,홍성현,최근원,이윤형,정인식 경희대학교 생명자원과학연구원 2002 硏究論文集 Vol.22 No.-

Expression of Artemisia annua terpene synthase in transgenic tobacco plants was examined. A full length cDNA encoding terpene synthase was cloned into pILTAB357 vector and transgenic tobacco plants were generated. The integration of this gene was analyzed by genomic DNA PCR and Southern blot analysis. The transcription of the terpene synthase gene in tobacco was confirmed by RT-PCR and northern blot analysis.

前腕部 經穴 取穴에서 骨度分寸法과 一夫法의 比較 硏究

박히준,채윤병,차웅석,박종배,이혜정,이향숙,인창식,고형균,김수영,최일환,김강식,문정배,배기태,유경환,육근영,정병주,손인철,임사비나 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2004 東西醫學硏究所 論文集 Vol.2004 No.-

Background : The cun measurement System, an essential and convenient method in locating acupoints, has been widely used in the practice of acupuncture. However, traditional cun measurement has been criticized for its lack of reliability. Objectives : The purposes of this study are to determine if one cun measured by the directional methods have a consistency with that of proportional methods and to investigate which factors are related with these differences, especially in forearm. Methods : The distance between the elbow crease and the wrist crease of forearm was compared to a reference value of one cun obtained by the directional method. In this method, one cun is one third of the distance between index finger and Small finger of a subject, measured at proximal interphalangeal joint. In addition, to investigate the factors influencing the differences between these two methods, we measured the height and body weight and calculated body mass index (BMI). Finally we analyzed the factors correlated with these lengths by linear regression test. Results : The results showed that one cun obtained by the directional methods were significantly different from one cun by the proportional methods in forearm. It was demonstrated that the length acquired with the directional method was more correlated with body weight and body mass index, while the length obtained by the proportional method was more correlated with the height.

유도초음파를 이용한 2.25Cr-1Mo재의 열화도 평가

박익근,박은수,이상용,권숙인,조윤호,윤승현 한국비파괴검사학회 2001 한국비파괴검사학회지 Vol.21 No.4

고온에서 장시간 사용으로 인하여 발생되는 경년열화 평가에는 파괴적인 방법이 신뢰성이 높지만 시험편 채취의 어려움이 있다. 그러므로 비파괴적인 방법에 의한 열화도 평가가 바람직하다. 본 연구에서는 2.25Cr-1Mo강에 대하여 장시간 등온열처리로 모의 열화시험편을 제작하여 고온설비부재에서 발생되는 탄화물의 석출 및 조대화, 불순물의 입계편석 등 금속학적 미세조직을 관찰하고, 미세조직의 변화와 유도 초음파의 전파특성과의 상관관계를 규명하고, 파괴시험치와 그 결과를 비교하여 초음파 비파괴평가에 의한 고온부재의 열화도 평가의 가능성을 실험적으로 검증하고자 한다. The destructive method is reliable and widely used for the estimation of material degradation but, it have time-consuming and a great difficulty in preparing specimens from in-service industrial facilities. Therefore, the etimation of degraded structural materials by nondestructive evaluation is strongly desired. In this paper, the use of guided wave was suggested for the evaluation of thermally damaged 2.25Cr-1Mo steel as an alternative way to compensate for limitations of fracture tests. The observation of microstructure variations of the material including carbide precipitation increase and spheroidization near gain boundary was conducted and the correlation with the guided wave features such as energy loss ratio and group velocity changes was investigated. Through this study the feasibility of ultrasonic guided wave evaluation for thermally damaged materials was explored.

제주해안에서의 지하해수의 수질특성에 관한 연구

박관석,오윤근 제주대학교 환경연구소 1995 환경연구논문집 : 제주대 Vol.3 No.1

This study was performed about some major items such as Water Temperature, Salinity, pH, COD, T-N and PO_(4)^(3-)-P on to examine the water quality characteristics of ground-seawater in the eastern and the southern coasts of Cheju island from May to September in 1994. The water temperature in ground-seawater was about 17±1℃ in two coasts, but that in natual-seawater changed greatly amrclmg to season. COD in natual-seawater was 0.79-0.82mg/l. and was higher than that of ground-seawater bemg 0.53-0.54mg/l. The concentration of T-N and PO_(4)^(3-)-P in ground-seawater were hgher than those of natual-seawater: Average concentrations of T-N and PO_(4)^(3-)-P in ground-seawater were 24.72~26.79 ㎍-at/l and 1.15-1.16 ㎍-at/l respectively, whde those in natual-seawater were 3.54~3.65 ㎍-at/I and 0.32-0.34 ㎍-at/l respectively.

Masserman 방법에 의한 뇌척수액 생성률 측정의 새로운 변형

박윤관,정용구,정흥섭,서중근,이훈갑,주정화,이기찬 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.8

Two modifications of the Masserman method for the measurement of cerebrospinal fluid (CSF) formation have been designed and compared with the Pappenheimer technique, the Masserman method and its old form of modification in animal experiment. Among the theoretical limitations of the Masserman method, resorption of CSF during the period of measurement was taken into account with two modifications of its integration in this study. The first one was calculated by reduced formula for a simple integration and the second one was produced by Simpson's formula of integration. Twenty adult cats were used for the experiment. Mean CSF production rate calculated by the Pappenheimer method, the Masserman method, the modified Masserman method and newly designed two modifications were 0.0207±0.0018㎖/min, 0.0128±0.0031㎖/min, 0.0166±0.0027㎖/min, 0.0183±0.003㎖/min and 0.0197±0.0033㎖/min respectively. When compared with the Pappenheimer method, data obtained from the Masserman method were significantly underestimated(p<0.01). All modifications have well correlated with the Pappenheimer method, and newly modified Masserman methods showed better cerrespondence.

제주도 남부해안에서의 지하해수에 대한 화학적 특성에 관한 연구

박관석,오윤근 제주대학교 환경연구소 1995 환경연구논문집 : 제주대 Vol.3 No.1

Geochemical characteristics of ground-seawater have been studed in the souterncoast areas(F'yose0n) of Cheju Island from July to Sptember 1994. The results are summarizedas fobws. 1) The water temperature of the ground-seawater was approximately 17±1℃ and remained almost constant. 2) As to the chemical compositiOn of standard-seawater contained 38.7% of Na^(+) and ground-seawater contained 39.5%, on the other hand the etandard-seawater contained 8.8% Mg^(2+) the ground-seawater contained 7.9%. 3) The chemical charadexistics of ground-seawater seem to be determined by Na^(+) and Mg^(2+) contents, therefore these two elements are considered to be important for detemmmg the chemical composition.

Erwinia rhapontici와 Burkholderia cepacia에 의한 저장 중 양파의 무름병

이영근,박윤문 安東大學校 農業科學技術硏究所 1999 農業科學技術 硏究論文集 Vol.6 No.-

경남 창녕 농산물저온저장고에서 무름증상을 보인 양파의 조직으로부터 2종의 병원세균을 분리하였다. 이 병원세균들의 특성을 조사한 결과, 양파의 무름병균인 Erwinia rhapontici 및 Burkholderia cepacia로 동정되었다. 이 두 종의 병원세균을 접종한 양파는 모두 5C에서는 물론이고 0C에서도 무름병이 발생되었다. Two species of the pathogenic bacteria were isolated from soft-rotten onion bulbs stored in agro-product storage house at Changnyeong, Korea. The pathogenic bacteria were identified as Erwinia rhapontici and Burkholderia cepacia based on the morphological and physiological characteristics. Soft rot symptoms occurred on onion bulbs when the bulbs were inoculated with the bacteria and stored not only at 5C but also at 0C.

제주도 동부해안에서의 지하해수에 대한 화학적 특성에 관한 연구

오윤근,박관석 제주대학교 환경연구소 1994 환경연구논문집 : 제주대 Vol.2 No.1

Hydrographic conditions (temperature, salinity, precipitation) and geochemical characteristics of ground-seawater have been studied in the easterncoast areas (Kimnyoung) of Cheju Island during July to September 1994. The results are summarized as follows. 1) The water temperature of the ground-seawater was approximately 17 ±1℃ and remained constant. 2) standard-seawater contained 38.69% of Na^(+), and 8.82% of M^(++), while ground-seawater contained 39.33%, of Na^(+) and 7.78% of M^(++). 3) The chemical characteristics of ground-seawater seemed to be determined by the component rates of Na^(+) and Mg^(++), therefore these two elements are considered to be important for determining the chemical composition. of ground-seawater.

만정 뇌경막하혈종에서 술전 CT음영 및 천두폐쇄배액술후 배액량과 재발과의 상관관계에 대한 연구

임동준,박윤관,정용구,김봉룡,정흥섭,이기찬,이훈갑,서중근 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.10