http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김길정,손종식,류우석,Kim, Kil-Jeong,Shon, Jong-Sik,Ryu, Woo-Seog 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.3
Fenton's reagent is applied to directly decompose the ion-exchange resins, IRN-78 and the mixed resin with IRN-77. The newly applied procedures is to dry the resin first and the catalyst solution is completely absorbed into the resin, then a limited dose of $H_2O_2$ is introduced for an effective reaction between the reagents within the resin. As a characteristic on the decomposition of IRN-78, the resin mixture should be heated to $40^{\circ}C$ to induce the initial reaction and lag time is also needed for about 20 minutes until the main reaction occurs. The effectiveness of the decomposition is investigated using $CuSO_4,\;Cu(NO_3)_2\;and\;FeSO_4$ as a catalyst and the decomposition rate is compared depending on the concentration of each catalyst and the amount of $H_2O_2$. The most effective catalyst was found to be $FeSO_4$ for IRN-78 alone and the mixed resin with IRN-77, and $FeSO_4$ showed a special effect that the reaction was initiated without heating and a lag time. Furthermore, the optimum concentration of the catalyst for each resin and the mixed one is suggested in the view point of the amount of $H_2O_2$ needed and the stability of the decomposition reaction.
위암환자에서 전산화단층촬영술에 의한 수술전 병기결정의 의의
김길정 대한영상의학회 1987 대한영상의학회지 Vol.23 No.5
Most gastric malignancies are advanced at the time of detection, so accurate diagnosis and staging are important for treatment planning and evaluation of the prognosis. Computed tomography is one of the most simple, rapid, non-invasive method of accurate diagnosis and staging of gastric malignancy. Authors anaysed significance of preoperative CT staging in 38 cases of pathologically confirmed gastric malignancies and the CT staging is compared with that of 20 cases who underwent surgery. RESULTS : 1. In a total of 18 cases who underwent surgery, resectability was 77.8% and false negative was 38.9%. 2. Causes of false negative interpretation are microinvasion to adjacent organs or metastatic micronodules, hidden regional lymphnode metastasis, misiterpretation to reactive hyperplasia of enlarged lymphnodes and indistint fat plane owing to severe emaciation. 3. Even a small localized mass without gastric wall thickening, there was extensive distant metastases, so accurate preoper tive CT staging would prevent unnecessar surgiacal exploration and will result in less complication, decreased mortality and expenses and allow more accurate treatment planning.
김길정,손종식,홍권표,Kim Kil-Jeong,Shon Jong-Sik,Hong Kwon-Pyo 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.2
Chemical wastes are generated from nuclear facilities and R&D laboratories, but the uranium concentration in the final dried cake is evaluated into 11.2 Bq/g, which exceeds the exemption level of 10 Bq/g for each U isotopes, so the cake is categorized into a radioactive waste. Acid dissolution was applied to extract uranium from the waste sludge, and uranium adsorption on the dissolved solution was experimented by using IRN-77 and Diphosil bead. A large amount of resin was required to get above 80% of uranium removal, which was found to be due to a large amount of metal ions simultaneously dissolved from the precipitates with uranium. As an alternative method, acid dissolution is applied to the dewatered wet cake of the sludge, and the natural evaporation method is adopted for the dissolved solution. The uranium concentration of the dissolved solution was estimated to be 6.97E-01 Bq/ml, and the specific activity of the final waste sheets is evaluated to be 4.3 Bq/g. These results lead to the suggestion that the application of acid dissolution to the wet cake and the natural evaporation for the dissolved solution is an effective treatment method for chemical wastes containing uranium.
하수처리장 바이오가스 플랜트의 가스엔진 최적 운영 방안
김길정,김래현 한국에너지학회 2019 에너지공학 Vol.28 No.2
한국지역난방공사에서 난지 물재생센터의 하수처리 설비로 부터 발생하는 45,300 m3/일의 바이오가스를 연료로1,500 kW, 2대 규모의 엔진 발전기를 운영하고 있다. 그러나 바이오가스 발전 플랜트의 실제 운영 경험이 미미하고, 축적된 기술 및 노하우 부족으로 가스엔진의 잦은 고장과 정지로 많은 경제적 손실이 발생하고 있다. 따라서이 발전 플랜트의 안정적인 운영을 위한 기술적 근본 대책 마련이 필요한 실정이다본 연구에서는 난지 물재생센터의 하수처리장에서 발생하는 바이오가스를 이용한 가스엔진 플랜트의 일련의공정상의 문제점을 확인하고, 각 단계별 문제점을 최소화 하여 실제 운전의 최적화 방안을 마련하였다. 먼저 고장정지의 주요 원인인 발생가스의 정제를 위해 현재 사용 중인 활성탄에 대한 성분분석 및 흡착실험을 통해 활성탄의흡착능력 품질 기준 마련을 위한 여건을 조성하였다. 또한, 불순물을 최소화하기 위한 활성탄의 교체주기의 기준수립, 황화수소 측정주기 강화, 활성탄 국산화, 설비개선 등 바이오플랜트 운영기준 강화 및 개선방안을 적용하여실제운전에 적용하였다. 그 결과 가스엔진 1호기는 530%, 2호기는 250%의 정상운전 가동시간이 증가되는 운영실적을 보였다. 또한통풍구의 설비개선을 통해 작업공정을 줄이고, 정상 운전시간과 가동률을 높일 수 있었다. 경제적으로도 77,000천원/년의 매출증대 효과를 나타냈다, 이와 같이 운영기준의 강화 및 개선방안을 적용하여, 바이오가스 플랜트의고장 정지를 줄이고 가동률을 높여, 안정적인 운영을 하는 것이 현실적인 바이오가스 플랜트의 최적 운영방안으로판단된다.