• 한국지반공학회지:지반
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• 제12권5호
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• pp.89-102
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• 1996

지오텍스타일에 의한 압력배수 특성을 연구하기 위하여 성토하중의 증가에 따른 기초지반의 초기압밀 촉진을 유도하기 위한 수직수평 배수공의 모형을 구상하여 실험을 수행하였다. 배수재로 사용된 지오텍스타일의 압축응력이 증가함에 따라 배수공의 누적배수량은 대수함수의 형태로 증가하였다. 수두상승에 따른 각 응력단계별 배수공의 배수량은 직선적으로 증가하였으며 그 증가율은 압축응력이 클수록 작게 나타나는 경향을 보였으며 배수공의 배수량은 포설 겹 수가 많을수록, 지반재료가 세립일수록 크게 나타났다. 지오텍스타일의 전수성과 배수공의 배수량의 관계는 정의 상관관계를 나타내었으며 그 증가율은 지반재료와 수두에 관계없이 거의 동일한 것으로 나타났는바 배수공의 배수능력은 지오텍스타일의 전수성으로 결정됨이 입증되었다.

• 한국지반공학회논문집
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• 제18권4호
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• pp.147-157
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• 2002

본 연구에서는 방사방향의 배수조건을 갖는 점성토의 압밀특성을 짧은 시간에 정확하게 평가할 수 있는 방사배수 일정변형률 압밀시험을 위한 시험기와 해석이론을 개발하였다. 개발된 시험기 및 해석이론에 대한 적용성을 검토하기 위하여 성형시료 및 불교란 시료에 대하여 방사배수 일정변형률 압밀시험과 단계하중 압밀시험을 실시하였다. 압밀곡선으로부터 평가되는 압밀정수 및 압밀계수에 대한 비교, 분석을 통하여 제안된 시험기 및 이론의 신뢰성과 적용성을 평가하였고, 방사배수 시험과 더불어 수행된 연직배수 일정변형률 압밀시험과 단계하중 압밀시험을 통하여 배수방향에 따른 영향과 시험기 및 해석이론의 적용성을 분석하였다. 또한, 일정변형률 압밀시험시 발생하는 과잉간극수압에 대한 분석을 통하여 간극수압의 발생 양상 및 실험결과에 미치는 영향을 확인하였다.

• 대한기관식도과학회지
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• 제15권2호
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• pp.64-70
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• 2009

Descending necrotizing mediastinitis(DNM) can occur as a complication of oropharyngeal and cervical infections that spread to the mediastinum via the cervical spaces. Delayed diagnosis and inadequate mediastinal drainage through a cervical or minor thoracic approach are the primary causes of a high mortality rate. Therefore, We emphasize that aggressive and emergent mediastinal drainage by surgical approach is most important method of DNM treatment. We studied 5cases diagnosed as DNM from 2005 through 2007. All patients underwent emergent surgical drainage of deep neck infection combined with mediastinal drainage through a thoracic approach. Primary oropharyngeal infection lead to DNM in four cases(80%) and odontogenic abscess in one case(20%). The outcomes were favorable 5patients. Overall mortality rate was 0%. The time interval from diagnosis based on manifestation of initial symptoms(oral or pharyngolaryngeal area) to surgical intervention was $7.4{\pm}4.2$days. One patient required reoperation due to remnant mediastinal abscess and pericardial effusion. Early diagnosis and emergent combined drainage with neck and chest incisions, together with broad spectrum intravenous antibiotics, should be considered standard care for this disease. And intensive postoperative care which it is continuous mediastinal irrigation and antibiotics use can significantly reduce the mortality rate.

• 펄프종이기술
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• 제33권1호
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• pp.24-29
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• 2001

The base paper of corrugated board is mainly produced from Korean old corrugated container (KOCC), and thus the recycling rate of KOCC is very high. However, there is a problem that the pulp quality is very low while the recycling rate of OCC is high. The fines content in KOCC, the main source of the corrugated board, amounts to nearly the half of the total stock, and its formation increases as recycling process repeats due to the hornification of fiber. There have been attempts to improve the drainage property of OCC by increasing the headbox concentration of the paper machine or by applying drainage-promoting polymer additives. However, these conventional methods have problems of weakened paper strength and lowered converting fitness caused by paper formation hindrance. The strength of linerboard could not be increased in case KOCC is used, because hornified OCC pulp can-not be sufficiently refined due to the lowered drainage property caused by fines formation. We studied about a new technique consisting of froth-flotation for fractionating pulp stock into a long fiber portion and fines fraction. This study will be developed in order to enhance the drainage and strength properties of a recycled OCC pulp by selective treatment of flocculant on fractionated OCC Fines.

• Journal of Gastric Cancer
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• 제20권4호
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• pp.376-384
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• 2020

Purpose: The role of prophylactic abdominal drainage in total gastrectomy is not well-established. This study aimed to evaluate the efficacy of abdominal drainage in the prevention and management of major intra-abdominal complications after total gastrectomy for gastric carcinoma. Materials and Methods: We retrospectively reviewed the data of 499 patients who underwent total gastrectomy for gastric carcinoma in a high-volume institution. The patients were divided into drainage and non-drainage groups and compared for the development and management of major intra-abdominal complications, including anastomotic leak, abdominal bleeding, abdominal infection, and pancreatic fistulas. Results: The drainage group included 388 patients and the non-drainage group included 111 patients. The 2 groups showed no significant differences in clinicopathological characteristics or operative procedures, except for more frequent D2 lymphadenectomies in the drainage group. After surgery, the overall morbidity (drainage group vs. non-drainage group: 24.7% vs. 28.8%, P=0.385) and incidence of major intra-abdominal complications (6.4% vs. 6.3%, P=0.959) did not significantly differ between the two groups. The non-drainage group showed no significant increase in the incidence rate of major intra-abdominal complications in the subgroups divided by age, sex, comorbidity, operative approach, body mass index, extent of lymphadenectomy, and pathological stage. Abdominal drainage had no significant impact on early diagnosis, secondary intervention or reoperation, or recovery from major intra-abdominal complications. Conclusions: Prophylactic abdominal drainage showed little demonstrable benefit in the prevention and management of major intra-abdominal complications of total gastrectomy for gastric carcinoma.

• Asian Pacific Journal of Cancer Prevention
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• 제15권21호
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• pp.9391-9394
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• 2014

Purpose: To evaluate the effect of internal-external percutaneous transhepatic biliary drainage (IEPTBD) for patients with malignant obstructive jaundice. Methods: During the period of January 2008 and July 2013, internal-external drainage was performed in 42 patients with malignant obstructive jaundice. During the procedure, if the guide wire could pass through the occlusion and into the duodenum, IEPTBD was performed. External drainage biliary catheter was placed if the occlusion was not crossed. Newly onset of infection, degree of bilirubin decrease and the survival time of patients were selected as parameters to evaluate the effect of IEPTBD. Results: Twenty newly onset of infection were recorded after procedure and new infectious rate was 47.6%. Sixteen patients with infection (3 before, 13 after drainage) were uncontrolled after procedure, 12 of them (3 before, 9 after drainage) died within 1 month. The mean TBIL levels declined from 299.53 umol/L before drainage to 257.62 umol/L after drainage, while uninfected group decline from 274.86 umol/L to 132.34 umol/Lp (P < 0.5). The median survival time for uninfected group was 107 days, and for infection group was 43 days (P < 0.05). Conclusions: The IEPTBD drainage may increase the chance of biliary infection, reduce bile drainage efficiency and decrease the long-term prognosis, and the external drainage is a better choice for patients with malignant obstructive jaundice need to biliary drainage.

• Journal of Chest Surgery
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• 제56권4호
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• pp.240-243
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• 2023

Background: Although there is no obvious recommendation for the management of pneumothorax recurrence after surgery, chemical pleurodesis with tetracycline has been applied as a significant treatment approach. The objective of this study was to evaluate the effectiveness of chemical pleurodesis with tetracycline for the management of postoperative recurrence of primary spontaneous pneumothorax (PSP). Methods: We retrospectively analyzed patients who underwent video-assisted thoracic surgery (VATS) as therapy for PSP at Hallym University Sacred Heart Hospital from January 2010 to December 2016. Patients who had ipsilateral recurrence after surgery were included in this study. Patients who underwent pleural drainage with chemical pleurodesis were compared with patients who only underwent pleural drainage. Results: In total, 932 patients who underwent VATS for PSP were analyzed, and ipsilateral recurrence after surgery occurred in 67 patients (7.1%). The treatment modalities for recurrence after surgery were observation (n=12), pleural drainage alone (n=16), pleural drainage with chemical pleurodesis (n=34), and repeated VATS (n=5). Eight of the 16 patients (50 %) treated with pleural drainage alone had recurrence again, while 15 of the 34 patients (44.1%) treated with pleural drainage and chemical pleurodesis experienced further recurrence. Chemical pleurodesis with tetracycline did not show a meaningful difference in the re-recurrence rate in comparison with pleural drainage alone (p=0.332). Conclusion: Chemical pleurodesis with tetracycline for the management of postoperative recurrence of PSP was not effective. Further research is required to identify alternative drugs that can significantly decrease the re-recurrence rate.

• 한국지반환경공학회 논문집
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• 제24권11호
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• pp.25-31
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• 2023

대표적인 비탈면 배수공법인 수평배수공은 비탈면 내 간극수압을 감소시키기 위해 국내외에서 다수 활용하고 있다. 이에 따라 다양한 연구들이 선행되어 왔으나, 수평배수공의 수량을 산정하기 위한 명확한 설계기준이 없어 획일적으로 시공되고 있다. 따라서 본 논문에서는 다양한 수평배수공의 배수성능과 영향인자에 대한 메커니즘을 규명하고자 현장토를 이용하여 모형토조실험을 수행하였다. 또한, 배수재 형상이나 크기에 따른 배수성능을 비교하고자 입도분포가 다른 시료에서의 유출량 결과를 비교 및 검토하였다. 정상류 상태에서 배수실험을 확인하기 위해 유출량을 측정한 결과, 모든 시료에서 최소 3분에서 최대 15분 뒤 일정한 속도로 배수되는 것을 확인하였다. 조립질 지반에서 단일 시간당 유출되는 양(단위 유출량)으로 비교한 경우, 배수재 형상과 크기에 따른 배수효과가 상이하여 배수성능에 영향을 미치는 것을 확인하였다. 향후 세립질 지반에서의 배수 성능실험과 수량을 결정하기 위한 기초자료로 충분히 활용될 수 있을 것으로 기대된다.

• 한국관개배수논문집
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• 제9권2호
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• pp.68-77
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• 2002

Return flow rate of agricultural irrigation for rice culture was investigated in the North Han river basin, Two small paddy watersheds were chosen and irrigation, drainage, infiltration and evapotranspiration were monitored and estimated during the irriga

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 추계학술발표회
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• pp.422-425
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• 2003

This study was carried out to apprehend the variation of quality of mine drainage in the abandoned Samtan coal mine. After closure of coal mine, although still pumping, water level in underground was raised to loom and the concentration of some elements such as Fe and Mn was elevated. At present, the worst pollution source in this area is too the acidic leachate drained from uncovered mine waste impoundment. The flow rate of mine drainage from the adit is ave. about 20,000t/d. If water were flooded and deteriorated due to stopping pumping, the impact of the mine drainage on the stream around the abandoned mine would be more severe. Therefore, It is considered that the prediction of water quality of mine drainage from the adit after stopping pumping will be very important with a view to establishing countermeasures.