한강의 Microflora 에 관한 연구 (제2보 ) - 춘천 및 청평저수지를 중심으로 한 한강의 식물성 plankton 과 그 계절적 소장

정영호(Yung Ho Chung),계응서(Eung Suh Kay),박덕환(Duck Whan Park) 한국식물학회 1968 Journal of Plant Biology Vol.11 No.2

The Han River was investigated monthly from April through Septemher, 1967 at Chunchon reservoir, Shin-yean, So-yang, Chung-pyong reservoir, Yang-soo-ri and Gi-doo-won to clarify the phytoplankton and to study its seasonal variation. At the same time, vertical distribution of phytoplankton was also studied from June through September at Chun-chon and Chung-pyong reservoir. The results obtained are as follows: As the environmental conditions, water temperature, dissolved oxygen, pH, and transparency were determined. The plankton samples collected from six stations were identified and classified by Engler`s classification system. It resulted in 4 phyla, 4 classes, 3 subclasses, 13 orders, 27 families, 5 tribes, 71 genera, 222 species, 1 subspecies, 51 varieties and 2 forms. The total number of Phytoplankton identified was 276. Of them, 84 species, 1 subspecies 26 varieties, 2 forms were recorded in this paper for the first time. Considering with the habitat of the total number of phytoplanktons, the highest percentage of Limnoplankton existed in the Chung-pyong reservoir. It suggests that the Chung-pyong reservoir is becoming to have the character of lake. The planktons appeared comnonly during six months at six stations belong to Chrysophyta including 22 species in 11 genera. Among these 22 species. Navicula, consists of 6 species, was the most abundant. The number of species identified uniquely at each station were 5 species in the Chun-chon reservoir, 6 in Chung-pyong and Yang-soo-ri, 8 at Shin-yean, 11 at So-yang, and 18 at Gi-doo-won. The number of species occurred at all stations were 29 in spring, 42 in Autumn and during investigation period. The maximum production of total phytoplankton was generally shown in the late spring and the early fall with differences in quantity at six collecting stations. In the Chun-chon reservoir, the high concentration of approximately 1,190,000 cells per litter in the months of August and September was due to the increase of Chrysophyte genus, Melosira and the highest concentration of approximately 2,000,000 in July at Gi-doo-won was caused Chlorophyte genus, Secenedesmus. The Chun-chon reservoir of three years old was different from the Chung-pyong reservoir of 25 years old with respect to increase in Melosira genus in August and September. After the completion of the Ui-am reservoir, though there was an increase in total density, the number of species of phytoplankton was not changed. It suggests that Ui-am reservoir is similar to the Chun-chon reservoir under the influence of the latter. The density of total phytoplankton was generally high at the depth of 2m to 5m for the two reservoirs.

패러글라이딩 사고에 대한 분석

김승환,김인병,정순미,정성필,장석준 대한외상학회 1999 大韓外傷學會誌 Vol.12 No.1

$quot;Background: Paragliding injuries are increasing recently due to the growing popularity of this sport. This topic has been discussed in numerous journals in the European countries with large mountains, such as Austria, Germany and Switzerland, Those studies gave information regarding the flight phase during which an injury ocurred, the type and site of injury, and suspected reasons for the accidents. This study was done to compare our data to those of other nations and give preventive advices to reduce injuries occurring during paragliding. Method: Nineteen paragliders documented as having injuries during paragliding at Chung-Ju, Korea from 1990 to 1997 were included in the study. Their accident reports including medical records, were analyzed retrospectively. Result: Eighteen of the injured were male with one female and their mean age was 25.6 years old. Five injuries were suffered during take-off, of which technical error was the cause in most cases. Also, 5 injuries occurred during flight due to a sudden change of thermal and wind condi- tions. The majority of injuries were suffered during the landing period, affecting 9 paragliders. They were mostly due to forced landings, unexpected obstacles, and sudden change of wind conditions. Thirty-three percent suffered spine trauma and 29% were involved in injuries of the lower extremities. Upper limb injuries occurred in 19%, and 19% also suffered cerebral concussion or contusion. Conclusion: We have found that spine and ankle injuries were commonly occur during paragliding, especially the landing phase. Proper knowledge of the procedures, adequate training and appropriate foot wear could help in reducing injuries while paragliding.$quot;

林土의 有機物의 分解速度와 無機養料의 垂直分布에 關한 考察

金遵敏,張楠基,鄭玩鎬 서울대학교 교육대학원 학술연구회 1966 論文集 - 서울대학교 교육대학원 Vol.3 No.-

Kim Choon Min, Chang Nam Kee and Chung Whan Ho: Decomposition rate of plant residue and the vertical distibution of mineral nutrients in the woodland soil. The relationship between decomposition rate of litter and the amount of mineral nutrients dispersed to the soil horizons were studied on the oak and pine forest stand. The results are as follows: 1. Decomposition rate of litter was highest in the F horizon of the oak stand, however in the pine stand it was highest in H horizon. 2. The correlation coefficients between decomposition rate and humus, organic carbon, moisture content, calcium, phosphorus, and nitrogen in the pine stand are; 0.90, 0.98, 0.76, 0.98, and 0.88, in oak stand; 0.97, 0.93, 0.92, 0.97, 0.74 and 0.73. 3. Factors which affect the decomposition rate of litter are humus, organic carbon, moisture content, calcium, phosphorus and nitrogen. 4. Among the variables, PH, moisture content and phosphorus under the oak and pine forest showed significant differences in each horizon. 5. C/N ratio of pine stands is higher than that of oak stands studied. 6. The vertical distribution of mineral nutrients is highly related with the amount of humus accumulated on top soil.

급성 바이러스간염의 간침생검조직소견

정환국 대한의학협회 1973 대한의학협회지 Vol.16 No.12

K 강선 및 긴장대 강선을 이용한 원위 쇄골 제 2형 골절의 치료

정환용,이우석,전택수,김대환,김광균,임재우 대한골절학회 2003 대한골절학회지 Vol.16 No.2

목 적: 쇄골 윈위부 제 Ⅱ형 골절의 치료에 있어 견봉 쇄골 관절을 통과하지 않고 직접 골편을 고정시키는 K 강선 및 긴장대 강선을 이용한 고정술로 치료한 환자에서 임상 결과를 후향적으로 분석하여 보고하고자 한다. 대상 및 방법: 2000년 5월부터 2001년 5월까지 쇄골 원위부 제 Ⅱ형 골절로 관혈적 정복술 및 K 강선 및 긴장대 강선을 이용한 고정술을 실시한 12례 중 최소 1년 이상 추시가 가능한 11례를 대상으로 하였다. 임상적 평가를 위해 최종 추시에서 변형된 견관절 기능 평가법을 사용하여 결과를 분석하였고 골유합 상태, 합병증, 견관절 운동범위를 측정하였다. 결 과: 전례에서 골유합을 얻었으며, 수술 후 골 유합까지의 기간은 평균 10주 (8~12주)였다. 최종 추시 상 견관절의 운동범위는 모두 정상 소견이었고, 변형된 견관절 기능 평가상 우수 9례, 양호 2례였다. 결 론: 쇄골 원위부 제 Ⅱ형 골절에서 K 강선 및 긴장대 강선을 이용한 고정술은 좋은 치료 방법 중 하나로 사료된다. Purpose: This is retrospective study to analyze the clinical results of the usefulness of K-wires and tension band wiring that fix the fracture fragment directly without passing the acromioclavicular joint in distal clacivle type Ⅱ fractures. Materials and Methods: From May 2000 to May 2001, eleven patients with distal clavicle type Ⅱ fracture were treated by open reduction and internal fixation with K-wires and tension band wiring. The clinical results were analyzed according to modified shoulder rating scale for distal clavicle freacture. Radiological union, complication, and range of motion of the shoulder were assessed. Results: All fractures were united at 10 weeks (8~12 weeks) in average. Finally, full range of motion of the shoulder joint was achieved in all patients. No complication was found and the modified shoulder rating scale for distal clavicle fracture were as follows: excellent 9 and good 2. Conclusion: K-wires and tension band wiring can be a good treatment method for distal clavicle type Ⅱ fractures.

굽은 경골 교합성 골수강내 금속정 : 1예 보고 A Case Report

정환용,이우석,김대환 대한골절학회 2003 대한골절학회지 Vol.16 No.1

경골 골절에서 골수강내 금속정 치료 후 이차적인 수상으로 발생한 파손된 골수강내 금속정에 관한 보고는 간간히 있었으나, 굽은 골수강내 금속정에 대한 보고는 극히 드물었다. 저자들은 이전에 경골 골절로 골수강내 금속정으로 수술한 후 교통사고로 발생한 굽은 골수강내 금속정 환자 1예를 치험하였기에 보고하는 바이다. Broken tibial intramedullary nails caused by secondary trauma have been infrequently reported, but bent intramedullary tibial nail was extremely rare. We describe a rare case of a bent intramedullary tibial nail due to a traffic accident who had previously operated with intramedullary tibial nail

비감염성 설사

정환국,유재영 대한감염학회 1978 감염 Vol.10 No.1

一般人의 볼링에 관한 實態調査硏究

申定勳,노형철,박인환 조선대학교 스포츠과학연구소 1995 스포츠科學硏究 Vol.7 No.-

로케트 工學에 관한 硏究 : 第1報 : 亞音速 亂流流動에서 飛行翼模型의 剝離現象 Ⅰst Report : Separation of Airfoils in Subsonic Turbulent Flow

朴煥奎,金鍾一,金鎭興,李茂錫,朴吉文,鄭洛奎,李行男,李東起 조선대학교 동력자원연구소 1984 動力資源硏究所誌 Vol.6 No.2

Separation, pressure and velocity distributions were studied fully developed two dimensinonal, incompressible flow over a flat airfoil in subsonic wind tunnel. Velocity and turbulence were measured with a two channel constant temperature hot wire anemometer and pressure with a pitot tube and pressure tranducer system. The experimental results were obtained as follow: (1) Turbulent intensity of shear layer just outside the separation point is considered to affect the size of separation bubble. (2) Static pressure coefficient is separated into three regions according to its value change. (3) Separation point is varied with the change of attack angle. (4) Velocity distributions and boundary layers normal to airfoil surface are changed as variation of attack angle of airfoil.

페스탈로찌의 수학교육론과 그 현대적 의의

金丁煥 東國大學校 敎育問題硏究所 1988 교육문제연구 Vol.5 No.-