http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
민형식,양인호,정상조,김한승,Min, Hyeong-Sik,Yang, In-Ho,Jeon, Sang-Jo,Kim, Han-S. 한국지하수토양환경학회 2009 지하수토양환경 Vol.14 No.5
본 연구에서는 lab-scale의 열탈착 장치를 설계 및 제작하고 실제 유류오염 토양을 대상으로 다양한 운전조건에 따른 오염토양정화성능을 비교하였다. 대상 토양은 군부대로 사용되던 부지 내 유류저장소 부근 고농도 오염토로 선정하였고, 10 L 용적의 원통형 batch 형태의 직접 가열식 열탈착기를 사용하여 초기 TPH 농도 4476 ppm의 고농도 오염 토양시료를 다양한 운전조건에서 열탈착하여 처리효율 분석을 수행하였다. 열중량 분석을 통해 열탈착 실험에서 대상 오염물질을 제거하기 위한 토양 시료의 평균 가열온도는 $200-300^{\circ}C$가 적합한 것으로 확인하였다. Batch 형식의 운전을 통한 처리효율 분석 결과 토양 내 오염물질을 90% 이상 제거하기 위해서는 약 $200^{\circ}C$에서는 10분, 약 $300^{\circ}C$에서는 5분 이상의 처리 시간이 요구되었다. 함수율이 높고 덩어리진 토양일수록 처리효율, 특히 고분자 오염물질의 처리효율이 크게 감소함을 보였다. 따라서 풍건을 통하여 오염토양 내 수분을 저하시킨 후 분쇄 처리하여 열탈착기에 주입하는 것이 효과적이라 판단된다. 또한 처리 전 토양과 처리 후 토양의 물리화학적 특성 비교한 결과 고온에 의해 증발된 수분함량을 제외하고 나머지 특성들은 거의 변화가 없어 실제 복원현장에서 오염토양을 열탈착 공정을 이용하여 오염물질을 제거한 후 추가적인 후처리 과정 없이 처리토양을 원래 위치에 복원하는 것이 가능함을 확인하였다. 본 연구결과는 현장운전에서 오염물질의 제거 효율을 극대화하기위한 인자 결정 및 검증을 위한 기초자료로 활용될 수 있을 것으로 사료된다. A field soil highly contaminated with petroleum hydrocarbons (JP-8 and diesel fuels) was employed for its remediation by a lab-scale thermal desorption process. The soil was collected in the vicinity of an underground storage tank in a closed military base and its contamination level was as high as 4,476 ppm as total petroleum hydrocarbon (TPH). A lab scale directly-heated low temperature thermal desorption (LTTD) system of 10-L capacity was developed and operated for the thermal treatment of TPH contaminated soils in this study. The desired operation temperature was found to be approximately $200-300^{\circ}C$ from the thermal gravimetric analysis of the contaminated field soils. The removal efficiencies higher than 90% were achieved by the LTTD treatment at $200^{\circ}C$ for 10 min as well as at $300^{\circ}C$ for 5 min. As the water content in the soils increased and therefore they were likely to be present as lumps, the removal efficiency noticeably decreased, indicating that a pre-treatment such as field drying should be required. The analysis of physical and chemical properties of soils before and after the LTTD treatment demonstrated that no significant changes occurred during the thermal treatment, supporting no needs for additional post-treatments for the soils treated by LTTD. The results presented in this study are expected to provide useful information for the field application and verification of LTTD for the highly contaminated geo-environment.
CT 지표를 이용한 두정-후두부 뇌실 도관의 정확한 삽입
민형식,송준혁,Min, Hyung-Sik,Song, Jun-Hyeok 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.7
Objective : placement of ventricular catheter is important to achieve long-term patency of the shunt system. We describe a method of calculating the insertion site, trajectory, and the length of the ventricular catheter using CT parameters in shunt surgery. Patients and Methods : These can be rapidly obtained using a caliper from a scout cut and two axial scans at lateral ventricular and upper 3rd ventricular level. To compare this technique with traditional one, we analyzed 40 consecutive patients who underwent shunt surgery. Results : Of 20 patients undergoing ventriculoperitoneal shunt insertion using this technique, none had poor location of the proximal catheter. In the counterpart, 9 patients had poor location(p=0.001). The number of patients who required revision surgery were also lower in the group using this technique, but it was not statistically significant (4 versus 2, p=0.422). Mean follow-up period was shorter in this technique group. Conclusion : This technique provides an accurate placement of the proximal catheter without special instrument or additional expenses.
관동정맥기형 파열로 인한 경추강내의 경막외 혈종 - 증례보고 -
민형식,송준혁,김명현,박향권,김성학,신규만,박동빈,Min, Hyung-Sik,Song, Jun-Hyeok,Kim, Myung-Hyun,Park, Hyang-Kwon,Kim, Sung-Hak,Shin, Kyu-Man,Park, Dong-Been 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.3
We report a case of spontaneous cervical epidural hematoma caused by a pure epidural arteriovenous malformation. A 22-year-old woman developed a sudden quadriplegia after a vigourous physical therapy including multiple acupunctures for her neck pain. Emergency cervical magnetic resonance image showed an epidural hematoma in her cervicothoracic junction. Emergent decompressive laminectomy and an evacuation of the hematoma were performed. A soft tissue mass found in the hematoma was proven to be an arteriovenous malformation. Postoperatively, the patient experienced some complications. However, she recovered completely from the motor weakness.
측정 불확도 표현 지침서(GUM)와 Monte-Carlo Simulation에 의한 불확도 전파 결과의 비교 연구
서정기,민형식,박민수,우진춘,김종상,Jungkee Shu,Hyungsik Min,Minsu Park,Jin-Chun Woo,Jongsang Kim 대한화학회 2003 대한화학회지 Vol.47 No.1
측정 및 화학분석에 많이 이용되는 한 점 교정식에 대하여 측정 불확도 표기 지침서(GUM)의 근사법과 Monte-Carlo Simulation에 의해 계산된 각각의 확장불확도를 비교하였다. 이 비교를 위하여 임의의 자료들을 여러 농도 수준에서 정규 분포 또는 t-분포로 가정하여 계산하였다. 나눗셈에 의한 한 점 교정식의 비선형성과 t-분포 형식을 함에 따른 입력량의 과도한 퍼짐으로 인하여, 경우에 따라서, GUM의 근사법으로 계산된 불확도가 Monte-Carlo Simulation에 의해 계산된 것보다 약 50% 이상의 오류가 있다는 것이 확인되었다. 그러나, 검출 하한을 계산하기 위하여 한 점 교정식을 이용하는 경우, 반응량의 표준불확도가 상대적으로 매우 크고 비선형성에 희한 계산 오류가 상대적으로 무시되므로 근사식에 따른 계산 오류가 발생하지 않았다. The expanded uncertainties calculated by the application of GUM -approximation and Monte-Carlo simulation were compared about the model equation of one-point calibration which is widely used for the measurements and chemical analysis. For the comparisons, we assumed a set of artificial data at the various level of concentration and dispersion of t or normal distribution. Mistakes of more then 50 % was revealed at the values calculated by GUM-approximation in comparison with those of Monte-Carlo simulation because of the excess dispersion from t-distribution and non-linearity by division in the equation. In contrary, the mistake of calculation due to non-linearity of the equation was not observed in the level of detection limits with the equation of one-point calibration, because of the relatively large values of uncertainty in response.
Li / MnO2 전지 ( CR15400 ) 양극 활물질의 물리 화학적 성질과 전지의 성능 1 . 저온 특성에 관하여
김유미,민형식,방부길,이진복 ( You Mee Kim,Hyung Sik Min,Bu Kil Bang,Jin Bok Lee ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.1
In the process optimization of CR15400 Li/MnO₂ cell the effects of cathode active material and electrolyte have been investigated. A sample each of typical EMD(Electrolytic Manganese Dioxide) and CMD (Chemical Manganese Dioxide) were chosen to be tested. It was found that cells with EMD was superior in the capacity at room temperature, while the one with CMD gave better performance at high rate or low temperature discharge. These results were explained in terms of physicochemical properties of manganese dioxide. Mixtures of EMD and CMD were used in a successful attempt to obtain good rate capability and low temperature characteristics without losing capacity. Far improvement of low temperature performance, the concentration of Li salt in the electrolyte was changed with good result. The CR15400 cells made using the improved cathode prepared in this work met the performance requirement for the power source of all automatic cameras.