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버뮤다그래스 페어웨이에 퍼레니얼라이그래스 오버시딩에 따른 두 초종의 밀도 및 품질 변화와 Trifloxysulfuron-sodium 처리에 의한 전이시기 조정
김대근,심규열,오상익,전재만 한국잔디학회 2012 Weed & Turfgrass Science Vol.26 No.2
When perennial ryegrass was overseeded in bermudagrass fairway, shoot density of perennial ryegrass was gradually increased to 88,000/m2 at the end of May, however dramatically decreased to 0 in September over the rainy season. On the other hand, that of bermudagrass increased from 2,000/m2 in March to 20,000/m2 in early June, and then decreased to 4,000/m2 at the end of July, after the rainy season, rapidly increased to 50,000/m2 in early September. Overseeding bermudagrass fairway with perennial ryegrass was maintained a good quality from mid-April to mid-June and decreased the quality over the rainy season from late June to July, and then turf quality was decrease to the worst level at the end of July. After the rainy season fairway quality was improved gradually and was the highest-level during September and early October. Trifloxysulfuron-sodium was treated to minimize the deterioration in turf quality due to early bermudgrass transition time in spring. Consequently, transition was started in mid-May and shoot density of bermudagrass treated by trifloxysulfuron-sodium was 70,000/m2 in mid-June. Even in the rainy season it was sustained as 30,000/m2, approximately three times higher than that of untreated overseeding fairway. 버뮤다그래스에 퍼레니얼라이그래스를 오버시딩 했을 때퍼레니얼라이그래스의 밀도는 3월부터 점차적으로 증가하여 5월 말에는 88,000주/m2를 유지하였다. 그러나 장마기를 거치면서 급격히 줄어들어 9월 초순경에는 0주/m2가되었다. 반면에 버뮤다그래스의 밀도는 3월경에 2,000주/m2에서 온도가 증가함에 따라 점차 증가하여 5월 중순경에 10,000주/m2, 6월 초순경에는 20,000주/m2로 증가하였으며, 장마기를 거치면서 일조량 부족으로 7월 중순경에는 4,000주/m2로 떨어졌다. 장마 후에는 밀도가 급격히 증가하여 9월 초순경에는 50,000주/m2 정도를 유지하였다. 퍼레니얼라이그래스로 오버시딩한 버뮤래스 페어웨이의품질은 4월 중순부터 6월 중순까지 좋은 품질이 유지되다가 장마기이후 7월말에 가장 나빴으나 이후 점차 향상되어9월 초순부터 10월 초순까지 좋은 품질을 나타내었다. 봄철 버뮤다그래스의 전이시기를 앞당겨 장마기의 품질저하를 최소화하기 위하여 trifloxysulfuron-sodium을 처리한 결과, 5월중순경부터 버뮤다그래스로 전이가 이루어져 6월중순경에는 70,000주/m2 정도의 밀도를 보였으며 장마기에도 약 30,000주/m2를 유지하여 무처리구에 비하여 약 3배 이상의 높은 밀도를 유지하였다.
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김대근,박선중 대한상하수도학회 2008 상하수도학회지 Vol.22 No.1
This study collected the latest 30-year (1976~2005) continuous rainfall data hourly recorded at 61 meterological observatories in Korea, and the continuous rainfall data was divided into individual rainfall events. In addition, distribution charts of average rainfall event-depth were created to facilitate the application to the overflow risk-based design of detention storage basin. This study shows that 4 hour is appropriate for SST (storm separation time) to separate individual rainfall events from the continuous rainfall data, and the one-parameter exponential distribution is suitable for the frequency distribution of rainfall event depths for the domestic rainfall data. The analysis of the domestic rainfall data using SST of 4 hour showed that the individual rainfall event was 1380 to 2031 times, the average rainfall event-depth was 19.1 to 32.4mm, and ranged between 0.877 and 0.926. Distribution charts of average rainfall event-depth were created for 4hour and 6 hour of SST, respectively. The inland Gyeongsangbuk-do, Western coastal area and inland of Jeollabuk-do had relatively lower average rainfall event-depth, whereas Southern coastal area, such as Namhae, Yeosu, and Jeju-do had relatively higher average rainfall event-depth.
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김대근,고영찬 대한상하수도학회 2009 상하수도학회지 Vol.23 No.2
In this study, a runoff hydrograph and runoff volume were calculated by using the kinetic wave theory for small urban watersheds based on the concept of low impact development(LID), and the effective imperviousness was estimated based on these calculations. The degree of sensitivity of the effective imperviousness of small watersheds to the impervious to pervious area ratio, infiltration capability, watershed slope, roughness coefficient and surface storage depth was then analyzed. From this analysis, the following conclusions were obtained: The effective imperviousness and paved area reduction factor decreased as the infiltration capability of pervious area increased. As the slope of watersheds becomes sharper, the effective imperviousness and the paved area reduction factor display an increasing trend. As the roughness coefficient of impervious areas increases, the effective imperviousness and the paved area reduction factor tend to increase. As the storage depth increases, the effective imperviousness and the paved area reduction factor show an upward trend, but the increase is minimal. Under the conditions of this study, it was found that the effective imperviousness is most sensitive to watershed slope, followed by infiltration capability and roughness coefficient, which affect the sensitivity of the effective imperviousness at a similar level, and the storage depth was found to have little influence on the effective imperviousness.
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척추암으로 오진된 척추 결핵으로 인한 흉추 병적 골절 - 1예 보고 -
김대근,조재환,김재현,하정기,이동호,이춘성 대한척추외과학회 2015 대한척추외과학회지 Vol.22 No.2
Study Design: A case report. Objectives: To report the case of a patient whose preoperative imaging results seemed to show metastatic spine tumor but who actually had a vertebral pathologic fracture caused by spine tuberculosis. Summary of Literature Review: Tuberculosis spondylitis is classified into peridiscal, central, anterior, and posterior spondylitis according to the portion involved, and central spondylitis can be mistaken as a tumor. Materials and Methods: Imaging studies were performed in a 79-year-old female with progressive lower extremity weakness. We found a T12 pathologic vertebral fracture, which was suspected to be metastatic cancer. Results: We performed surgery and found spine tuberculosis in the pathological and immunological examinations. Two weeks postoperatively, the patient could walk with crutches and underwent anti-tuberculosis therapy. Conclusions: Even when the results of imaging studies predict spinal metastasis, we should keep in mind the possibility of spinal tuberculosis. 연구 계획: 증례 보고목적: 영상검사에서 척추 전이암으로 의심되는 흉추 병적 골절이 있는 환자에서 결핵성 척추염으로 진단되는 1예를 경험하였기에 보고하고자 한다. 선행문헌 요약: 척추 결핵은 침범 부위에 따라 추간판 주위성, 중심성, 전방, 후방으로 구분되며, 중심성인 경우에는 종양으로 오인될 수도 있다. 대상 및 방법: 외상없이 내원 2주전부터 진행되는 하지 위약감을 주소로 내원한 79세 여자에게 시행한 영상 검사상 흉추 12번의 전이암이 의심되는 병적 골절이 발견되었다. 결과: 환자는 수술을 하였으며 함께 시행한 병리 및 면역학적 검사상 결핵성 척추염으로 진단되었다. 환자는 위약감이 점차 회복되어 술 후 2주째부터 목발 보행이 가능하였으며, 결핵치료도 병행하고 있다. 결론: 영상 검사의 결과 척추 전이암이라고 진단 예측되어도 척추 결핵의 가능성도 염두에 두어야 한다.
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