• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1997.05a
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• pp.30-38
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• 1997

고속도로변에 설치된 retention pond는 drainage system의 일부분으로 우기에 빗물의 양을 조절하고 고속도로 노면에서 운반되어 retention pond에 유입된 오염된 입자를 침전, 제거시키기 위해 설치되었다. 빗물에 입자상태로 이동된 납, 아연, 카드뮴를 제거하기 위해 설치된 retention pond의 효과를 평가하기 위해 수리지질학적 연구 및 부유퇴적물의 물리화학적 특징을 규명하기 위한 연구가 수행되었다. 부유퇴적물과 비교하기 위해 심하게 오염된 roadside soil과 오염되지 않은 background soil에 대해서도 연구가 수행되었다. 부유퇴적물의 중금속함량은 background Sologne soil에 비해 원소에 따라 2-8배 높다. 그러나, roadside soil의 중금속함량은 부유퇴적물에 비해 7-26배 높다. Sequential extraction methods를 이용하여 분석한 결과 심하게 오염된 roadside soil에 존재하는 납, 아연, 카드뮴은 대부분 쉽게 용해될 수 있는 상태 (Fraction FII, FIII)로 존재하며 반면에 규산염광물과 수반되는 금속함량의 비율은 매우 낮다. 부유퇴적물에서는 규산염광물과 수반되는 금속함량이 전체 금속함량의 1/3까지 크게 증가한다. Roadside soil 과 부유퇴적물사이의 중금속함량 차이가 매우 큰 것은 중금속의 대부분이 retention pond에 이르기 전에 고속도로변과 배수로 일부에 축적되어 모두 상실하기 때문이다.

• Journal of Chest Surgery
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• v.32 no.6
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• pp.599-602
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• 1999

A 51-year-old woman was transferred from a private hospital for persistent massive left pleural effusion. Available examination methods did not reveal the cause of the disease. The pleural effusion was confirmed as chylothorax by thoracentesis and chest computed tomography. Previous tube drainage and pleurodesis had failed. Therefore we decided on an operative approach. A left thoracotomy revealed nothing abnormal except for the oozing lymph from the mediastinal pleura, which was sutured by 4-0 prolene. Decortication and pleurodesis were done at the same time. Postoperative course was uneventful and no recurrent pleural effusion was recognized for 3 months. Adult Idiopathic unilateral chylothorax with unknown etiology is rare, but this case was successfully treated with an operative method.

• Journal of Environmental Science International
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• v.19 no.11
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• pp.1315-1322
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• 2010

A membrane bioreactor (MBR) was designed using polyvinylidene fluoride(PVDF)-type hollow fiber membrane modules with a treatment capacity of 10 ton/day. A pilot plant was installed in a sewage treatment plant and was operated with an intermittent aeration method which avoids any concentration gradient of suspended solids (SS) in the MBR. For continuous operation, the pilot plant was first tested with influent (mixed liquor suspended solid:MLSS of 1000-2000 mg/L) of aeration tanks in the sewage treatment plant. The MBR was pre-treated with washing water, 10% ethanol solution, 5% NaOCl solution and finally washing water, one after another. To demonstrate the effect of the MBR on sewage treatment, compared with conventional activated sludge processes, we investigated the relationships among permeate amount (LMH), change in operation conditions, influent MLSS level and sludge production. It was found that the optimum aeration rate and suction pressure were $0.3\;m^3$/min and 30~31 cmHg, respectively. Under stable conditions in aeration, suction pressure, influent flow rate and drainage, the SS removal efficiency was more than 99.99% even when the MLSS loading rate changes. Compared with conventional activated sludge processes, the MBR was more effective in cost reduction by 27% based on permeate amount and by 51.5% on sludge production.

• Proceedings of the Korean Geotechical Society Conference
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• 2004.03b
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• pp.938-945
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• 2004

In order to cope with ever growing traffic flow and complexity in the urban area, construction demands for expanding and realigning of existing urban roads and massive development of underground space within the urban area are in its increasing trend, it is fact that, mainly due to lack of statistical data accumulation through real construction, technology and construction practice to support such demands can hardly be said to have been established enough and leave many things still to be developed. These circumstances therefore came to motivate me to get into a study for a particular subject of "Design Basics for Closely Neighbored Twin Tunnel" among others, and also to put forward subjects required to be further studied in this connection in the future as follows: 1) To make a new economical design model for closely neighbored twin tunnel not only to make a drain for center perfect but also a tunnel construction safe. 2) Further efforts should be exerted for establishment of general standards for design and construction of various types of large cross-section tunnels including Twin structure.

• Pediatric Infection and Vaccine
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• v.5 no.2
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• pp.276-282
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• 1998

Staphylococcal pneumonia caused by staphylococcus aureus can be characterized by its severity and rapid progress as a bacterial infection. The disease shows a high mortality in younger patients, especially in infants unless early and appropriate treatment is carried out. Treatment can be made of medical method alone but in cases of surgical interventions are needed, immediate surgical methods such as closed or open drainage of pleural fluid, lobectomy and decortication should be followed with combination of medical therapy. The choice of antibiotic should be made by proper antibiotic sensitivities tests. For a methicillin sensitive S. areus(MSSA), the penicillase resistant penicillin would be the first choice and for a methicillin resistant S. aureus (MRSA), the glycopeptides such as vancomycin would be the first one. Other drugs can also be used if the bacterial agents show any sensitivities to these drugs. Commonly, the chest roentgenographic findings reveal infiltrations, empyema, pneumothorax, pleural effusion, atelectasis or pneumatoceles in staphylococcal pneumonia and this fact easily can lead the physicians to its diagnosis as soon as possible. We experienced 5 cases of staphylococcal pneumonia in infants, proven by through bacterial cultures and report them with brief review of the related literatures.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2006.06a
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• pp.1-18
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• 2006

A novel transmission electron microscopy technique for the visualization of polymers adsorbed on secondary fines has been developed. This technique has been utilized in observing the adsorption behavior of various wet-end additives. The technique is sensitive enough not only to allow differentiation between linear and branched polymers, but also to observe differences in the adsorption behavior and conformational characteristics of particular polymeric derivatives. Conformational changes of a cationic polyacrylamide (CPAM) were examined in response to variations in wet-end conditions, such as mixing time and system conductivity. The molecular conformations of cationic starch and cationic guar gum were also examined by this technique. The technique has been employed to observe the effects of silica microparticles on the conformational characteristics of CPAM (drainage/retention aid) pre-adsorbed on secondary fines. The transmission electron microscopy method is a viable tool for investigating the macromolecular events that make up a large part of wet end chemistry in papermaking.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.31 no.2
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• pp.15-24
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• 1999

A new technique for recycling of white water was developed in order to reduce the calcium hardness in a closed OCC recycling system. Calcium ions present in the white water were precipitated as calcium carbonate by reacting with sodium carbonate, and the precipitated $CaCO_3$ was removed from the system using a flotation fractionation method, which has been commonly used in deinking process. In the flotation stage, a mixed gas of $CO_2$-air was purged into the flotation cell because the pH of $Na_2CO_3$-treated white water was reduced to neutral by $CO_2$ gas. Since $CaCO_3$ precipitate tends to stick onto fine fiber surface and then selectively removed from the white water, a proper amount of suspended solid in white water acts as an important factor for deciding the removal efficiency. By the application of $Na_2CO_3$ addition-$CO_2$ flotation to the short circulated white water, the calcium hardness was significantly reduced by 87% and more. Removal of calcium ions with fine fibers led to a drainage improvement, reduction of fresh water consumption, and enhanced efficiency of wet-end chemicals.

• KCID journal
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• v.17 no.2
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• pp.71-81
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• 2010

Stream Pilot Project, which began in May 2003 and finished in December 2003, was selected to develop effective methods applicable to nature-like streams. Stream restoration projects aim to maintain or increase ecosystem goods and services while protecting downstream and coastal ecosystems. Fields environmental monitoring such as flow discharge and precipitation were conducted along the Idong stream for amount of channel zone change in 2007. This study selected three monitoring positions to measure the water level and discharge of flowing water. A stage-discharge relation is obtained from direct discharge measurements for three stations by fitting an empirical relationship to the data set. Since discharge measures are made only for low flow conditions, a curve of discharge against stage can then be built by fitting these data with a power curve. And this study used data obtained from floodmark checkup as well as HEC-RAS model to analyze the hydrodynamic characteristics of monitoring sites. Reach-averaged hydraulic parameters for the supply reach were calculated from the small area's HEC-RAS model for Idong stream, and a HEC-RAS model used to analyze hydraulics for a period in 2007, after the stream was considered bank stabilization.

• Journal of Chest Surgery
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• v.33 no.4
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• pp.306-309
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• 2000

Background: The purpose of this study was to evalute the diagnostic value of 2mm video thoracoscopy for primary spontaneous penumothorax. Material and Method: During the period of March to June 1999, we prospectively analyzed 33 consecutive patients suffering from primary spontaneous pneumothorax. 2mm video-assisted thoracoscopy was compared with the operative finding. We observed recurrence during the mean follow-up of 3months. Result: Blebs were present in 24 patient(73%: 24/33). These were treated by 10mm video-assised thoracoscopic stapling. Nine pateints with no bleb were treated with pleural drainage. There were no significant differences in the bleb finding. No recurrence occurred during the follow-up period. Conclusion: A 2mm video thoracoscopic examination for primary spontaneous pnumothorax is a useful alternative in deciding the operative indication.

• Archives of Plastic Surgery
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• v.36 no.6
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• pp.795-798
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• 2009

Purpose: The repair of complex chest wall defects presents a challenging problem for the reconstructive surgeon. In particular, a free flap is often required when the defect is large, in which case suitable recipient vessels must be found to insure revascularization. The authors report a case of persistent bronchopleural - cutaneous fistula developed after undergoing lobectomy for lung cancer. Methods: The defect area was repaired using a free vertical rectus abdominis muscle flap revascularized by microvascular anastomosis to the 6th intercostal pedicle. The flap obliterated the right chest cavity, closed the site of empyema drainage, and aided healing of a bronchopleural - cutaneous fistula. Results: The patient has remained healed for 14 months without any postoperative complications and recurrent infection or fistula. Conclusion: We suggest that a rectus abdominis musculocutaneus free flap and intercostal pedicle as a recipient could be a useful method for repair of chest defects.