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Reduction of Radioactive Waste from Remediation of Uranium-Contaminated Soil
김일국,김승수,김계남,Gyu-Seong Han,최종원 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.3
Great amounts of solid radioactive waste (second waste) and waste solution are generatedfrom the remediation of uranium-contaminated soil. To reduce these, we investigatedwashing with a less acidic solution and recycling the waste solution after removal of thedominant elements and uranium. Increasing the pH of the washing solution from 0.5 to 1.5would be beneficial in terms of economics. A high content of calcium in the waste solutionwas precipitated by adding sulfuric acid. The second waste can be significantly reduced byusing sorption and desorption techniques on ampholyte resin S-950 prior to the precipitationof uranium at pH 3.0.
김일국,장학 대한의사협회 2020 대한의사협회지 Vol.63 No.4
Lymphedema is a debilitating and progressive condition, which results in the accumulation of lymphatic fluid within the interstitial compartments of tissues and hypertrophy of adipose tissue due to the impairment of lymphatic circulation. The mainstay of current lymphedema treatment is nonsurgical management such as complex decongestive therapy and compression therapy. Recently, surgical treatment of lymphedema based on microsurgery has been developed to enable the functional recovery of lymphatic drainage and has complemented nonsurgical treatment. Lymphaticovenular anastomosis and vascularized lymph node transfer are representative physiologic surgeries in the treatment of lymphedema. Lymphaticovenular anastomosis is conducted to drain lymphatic fluid from obstructed lymphatic vessels to the venous circulation through surgically created lymphaticovenous shunts. Vascularized lymph node transfer involves harvesting lymph nodes with their vascular supply and transferring this vascularized tissue to the lymphedema lesion as a free flap. In addition to physiologic surgeries, ablative surgeries such as direct excision and liposuction also can be performed, especially for end-stage cases. Indications for surgical treatment vary across institutions. It is important not to delay physiologic surgery in mild to moderate cases of lymphedema.
김일국,김준현,김성만,박찬우,양희만,윤인호 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
In this study, we developed a clay separation method for cesiumcontaminated soil using polyethyleneimine (PEI)-coated magnetic nanoparticles. It is reported that radioactive cesium tends to be adsorbed on the clay minerals by ion exchange. Thus, the separation of clay minerals from soil is the key issue in remediating cesium-contaminated soil. Magnetic separation is a simple method that has been used for the contaminated soil volume reduction. Since the clay minerals have negatively charged surface, Fe<sub>3</sub>O<sub>4</sub> nanoparticles can be modified with cationic charged different agents to improve the separation efficiency. PEI, which is known for its high density of positive charge, was introduced onto the surface of Fe<sub>3</sub>O<sub>4</sub> nanoparticles to bring in cationic charge on the Fe<sub>3</sub>O<sub>4</sub>-PEI nanocomposites. These functional nanocomposites were applied to separate clay from soil particles and showed the better performance than naked magnetic nanoparticles in separation efficiency.
유방재건술에 사용된 식염수 보형물의 임상적 내구성과 누출
김일국,이준호,김용하,김태곤,이수정,강수환 대한성형외과학회 2011 Archives of Plastic Surgery Vol.38 No.6
Purpose: Despite wide clinical use of breast implants,there is continued concern about the lifespan of these devices. The causes of explantation were infection,deflation of implant and patient's want. The deflation of saline-filled breast implant was related to strength and durability of implant shell. The purpose of this study is to evaluate the clinical durability of saline-filled breast implant through the analysis of duration until deflation occurred,causes, incidence and influencing factors. Methods: Retrospective analyses were conducted on clinical records for 19 cases of deflation of saline-filled breast implant from 201 cases of breast reconstruction with saline-filled implant between May 1995 and June 2011. The authors had been analyzed the causes of deflation,survival duration, symptom, sign, nipple excision,volume of implant, saline filling, method of reoperation,breast cancer stage and combined capsular contracture. Results: The causes of deflation were attributed to the cases that cannot be evaluated the causes in 15 cases, fall down in 1 case, mammography in 2 cases, accidental needle injury in 1 case. Mean survival duration was 4 years and 5 months. The duration of survival was less than 1 year for 5 cases, 1 year to 10 years for 10 cases, more than 10years for 4 cases. The volume between 201 and 250 cc of deflated breast implant was rated as high by 14.0 percent. The deflation rate of underfilled implants was 11.4 percent,adequate filled implants was 9.3 percent. None of overfilled implant was deflated. The deflation of smooth surface implant was 5 of 152 cases. Textured implant was 14 of 49cases. The capsular contracture of non-deflated breast implant was 28 of 182 cases and that of deflated breast implant was 6 of 19 cases. Conclusion: The patients who underwent saline-filled breast implant implantation should be informed that their implant could deflate. The analysis of clinical durability and causes of deflation in breast implant was important for the prediction and prevention of reopeation. The authors could suppose the causes of deflation of saline-filled breast implant through history, duration of survival, inspection of the shell of implant.
노인의 안면골 골절: 최근 5년간 300명의 환자에 대한 통계적 고찰
김일국,김용하,김태곤,이준호 대한의사협회 2011 대한의사협회지 Vol.54 No.10
Trauma in the elderly, such as facial bone fractures, has been increasing, but there is paucity of literature examining the facial bone fractures of the elderly. Therefore, this study contributes to the prevention of facial bone fractures in the elderly and presents support from the literature for establishing a support policy for the elderly. Retrospective analyses were conducted on clinical records from January 2006 through December 2010 for facial bone fractures in 474cases; of those cases, 300 patients were 55 years old or above. The statistical analyses were conducted according to the sex, age group, occupation, area of residence, time of accident,cause of accident, site, and multiplicity of the fractures, associated injuries, combined soft tissue injuries, treatment methods, and sequelae. Two hundred twenty-five (75.0%) were male and seventy-five (25.0%) were female patients. Among the age groups, patients in the age range of 65 to 74 years old were the most common. There were 136 (45.3%) patients who were farmers and agricultural support personnel. Patients in urban areas were more commocn than those from rural areas. The number of the patients increased each year except in 2008. The most common cause of fractures was traffic accidents, followed by slip down. Zygomatic fractures were the highest among all fracture types, followed by nasal bone fractures. There were more cases undergoing conservative treatment compared to those in a study of all age groups. Gathering information on facial bone fractures in the elderly will be valuable in establishing preventive strategies and policies.