http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Zr계 라-베상 수소저장합금의 전기화학적 충 · 방전 특성
이재명(Jae Myoung Lee),김찬중(Chan Jung Kim),김대룡(Dai Ryong Kim) 한국수소및신에너지학회 1994 한국수소 및 신에너지학회논문집 Vol.5 No.2
To develop high capacity hydrogen storage alloys for secondary Ni/MH batteries, electrochemical charge/discharge characteristics of Zr<sub>1-x</sub>Ti<sub>x</sub>Mn<sub>1-y</sub>V<sub>y</sub>Ni<sub>1-z</sub>M<sub>z</sub> (M=Al, Co, Fe) alloys were investigated, in which 0.2≤x≤0.6, 0.2≤y≤0.8, 0.2≤z≤0.4. With increasing Ti content(x) and/or decreasing V content(y), lattice constants and maximum theoretical capacities of the alloys were decreased and equilibrium pressure of hydrogen absorption were increased. Electrochemical discharge capacities were increased with increasing Ti content(x). Especially, the alloys of x=0.4-0.6 showed better charge/discharge efficiencies than those of x<0.4. Discharge capacities of Zr<sub>0.4</sub>Ti<sub>0.6</sub>Mn<sub>0.4</sub>V<sub>0.6</sub>Ni<sub>0.8</sub>Fe<sub>0.2</sub>, Zr<sub>0.4</sub>Ti<sub>0.6</sub>Mn<sub>0.4</sub>V<sub>0.6</sub>Ni<sub>0.8</sub>Al<sub>0.2</sub> and Zr<sub>0.5</sub>Ti<sub>0.5</sub>Mn<sub>0.4</sub>V<sub>0.6</sub>Ni<sub>0.6</sub>Co<sub>0.4</sub> were 385, 328 and 333mAh/g, respectively. These alloys were fully activated within five charge/discharge cycles and had a good charge and discharge rate capabilities and temperature characteristics.
혈액투석 중인 환자에서 발생한 투석-연관성 심낭염의 임상적 고찰
이재명 ( Jae Myoung Lee ),김진수 ( Jin Soo Kim ),김정권 ( Jung Kwon Kim ),양재원 ( Jae Won Yang ),김민수 ( Min Soo Kim ),한병근 ( Byoung Geun Han ),최승옥 ( Seung Ok Choi ) 대한신장학회 2002 Kidney Research and Clinical Practice Vol.21 No.6
배 경 : 말기신부전 환자에서 발생하는 심남염은 부적절한 투석, 감염, 부갑상선 호르몬 이상, 결체조직질환, 혈소판 기능손상, 심근경색, 투석시 사용되는 항용고제나 약제 그리고 면역학적 요소로 인한 순환 면역 복합체 및 보체 등과 연관되어 나타날 수 있으며, 요독성 심낭영의 발생 빈도는 약 20% 정도로 말기신부전 환자의 유병률과 사망률을 높이는 중요한 합병증의 하나로 알려져 있다. 일반적으로 심낭염의 원인과 심낭삼출책의 정도는 치료에 대한 반응과 예후에도 차이가 있으며 심낭삼출액의 진단과 추적관찰에는 심초음파촬영이 유용한 것으로 알려져 있다. 이에 저자들은 정기적 혈액투석 중 요독성 심낭염의 소견을 보여 심초음파를 시행한 환자의 임상 양상을 알아보고자 하였다. 방 법 :심초음파 검사상 요독성 심낭염이 의심된 환자 35예의 진료기록을 검토하여 심남 삼출량의 정도에 따라 미세소량군과 중등-대량군으로 나누어 두 군간의 진단 당시의 검사결과 및 심출 정도에 따른 임상적 특징을 비교하였다. 결 과 : 미세소량군과 중등-대량군은 각각 18예 (51.4%), 17예 (48.5%)이었고, 심장 탐포네이드는 후자에서 2예가 관찰되었다. 중등-대량군의 경우 미세소량군과 비교하여 요소감소율은 각각 24.3±21.2%와 42.9±20.0%으로 상대적으로 낮게 나타났으며 (p<0.05), 총 투석기간도 17.6±21.0개월과 3.6±8.3개월로 중등-대량군이 유의하게 긴 것으로 나타났다(p<0.05). 투석기간이 6개월 미만인 경우에 심낭염이 있는 경우가 총 16예 (45.7%)이었고. 12개월 이상인 경우에 모두 8예 (22.9%)가 중등-대량군으로써 미세소량군보다 많은 분포를 보였다. 미세소량군과 중등-대량군의 좌심실 직경은 이완기와 달리 수축기시에만 각각 3.84±1.1 ㎝와 4.8±0.7 ㎝을 보여 유의한 차이를 보였다.(p<0.05). 결 론 : 혈액투석 중인 환자의 심혈관계질환에 대한 추적검사 중 심비대의 소견이 있는 경우에 심초음파 검사는 심낭염과 심장의 기저질환 등을 감별할 수 있는 유용한 진단적 수단이 되며, 처음 투석을 시행하고 6개월내에 다수의 심낭염이 나타나므로 이에 대한 주의가 필요하고 총 투석기간이 1년 이상 되는 환자에서 심낭 삼출액의 양이 많은 것으로 나타나 심초음파 검사를 통한 심장기능에 대한 정확한 평가 및 투석 적절도에 대한 세심한 평가가 투석-연관성 심낭염의 합병증을 줄이는데 도움을 주리라 생각된다. Background : The accurate pathogenetic mechanism of dialysis associated pericarditis remain uncertain, but its clinical significance is very important from a therapeutic and prognostic point view. Clinical features of the disease weren`t reported well in Korea. So, we analyzed the clinical characteristics of the dialysis associated pericarditis. Methods : Thirty-five patients were included in this study. The study group was divided into two groups (a minimal group and moderate to large group) according to the amount of the pericardial effusion on echocardiogram. We reviewed and compared the clinical appearance, laboratory data and echocardiogram findings. Results : There were 18 cases (51,4%) of minimal amount pericardial effusion and 17 cases (48.5%) of moderate to large amount. Cardiac tamponade developed in 2 patients. There was a significant difference in urea reduction rate between minimal group (42±20 and moderate to large group (24.3±21.2%) (P<0.05). A time to pericardial effusion development from dialysis initiation was 3.6±8.3 months, 17.6 21.0 months, respectively and the difference showed statistical significance (p<0.05). The Left ventricular dimension at systole was 4.8±0.7 ㎝, 3.8±1.1 ㎝, respectively. This difference is statistically significant (p<0.05). In the minimal amount group, 16 (89.9%) cases were treated conservatively and 2 cases (10.1%) were treated surgically. In the moderate to large amount group, 10 cases (58.8%) were treated surgically. Conclusion : These results show that the dialysis associated pericarditis with moderate to large amount of pericardial effusion have lesser urea reduction rate, longer dialysis treatment period and require further surgical approach than minimal amount group. We suggest that the sufficient and adequate dialysis and the regular echocardiogra needed. This need is more eminent as the duration of dialysis become longer. It is possible to prevent the development of pericarditis and its complication.
축전지용 수소저장합금 전극의 전기화학적 특성에 관한 연구
김찬중(Chan Jung Kim),이재명(Jae Myoung Lee),최병진(Byung Jin Choi),김대룡(Dai Ryong Kim) 한국수소및신에너지학회 1993 한국수소 및 신에너지학회논문집 Vol.4 No.2
Intensive studies on the electrochemical characteristics of TiFe type alloy electrodes have been carried out to clarify the mechanism of electrochemical hydrogen absorption and desorption. It was found that electrochemical activation of the TiFe type alloys is difficult and that charge efficiencies are very low even after a decade of activation cycles. However, by the pretreatment of the powders such as gas activation and/or Ni chemical plating, charge efficiencies fairly increased, especially for the TiFe<sub>0.8</sub>Ni<sub>0.2</sub> alloy. It was considered that difficulties to activation and lower charge efficies of the alloys are due to the presence of the passivation films, which prohibit inward diffusion of hydrogen and promote the combination of adsorbed hydrogen atom to gas bubbles during the electrochemical charge. In addition, lower diffusivity of hydrogen in the alloys may be played an important role lowering the charge efficiencies.
이갑래(Kap-Rai Lee),김삼수(Sam-Soo Kim),이재명(Jae-Myoung Lee),박성희(Song-Hui Park) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
The problem of robust control of a underwater vehicle subject to variation of a real parameter and velocity is considered. The controller set which stabilized perturbed plant is chosen using numerical gradient method, and the controller is used for nominal performance and robust performance. Simullation results are presented to show that the precise montion control of the controller is accomplished under perturbation in the system.
수소용기내에서 수소저장합금 분말 성형체의 수소 흡수 및 방출 거동
김찬중(Chan Jung Kim),이재명(Jae Myoung Lee),김대룡(Dai Ryong Kim) 한국수소및신에너지학회 1995 한국수소 및 신에너지학회논문집 Vol.6 No.1
Hydrogen storage alloy powder compacts were prepared by using automatic press, with PTFE as a binder. Hydrogen absorption and desorption characteristics and thermal conducting property of the compacts were studied using test hydrogen cylinder, comparing with bare alloy powder. The compacts showed better rate capability and activation characteristics than bare powder. Effective thermal conductivity and diffusivity of the compact bed were 1.0X10<sup>-2</sup>W/cmK and 2.0X10<sup>-2</sup>cm²/s, respectively, which were similar to that of bare powder bed. A good rate capability of the compacts was interpreted in terms of hydrogen permeation rather than thermal conductivity in the beds.
단일 기관에서 지방유제 단독 제형 투여 처방의 적절성 평가
정혜련 ( Hye Ryun Jung ),은명온 ( Myoung On Eun ),방은숙 ( Eun Sook Bang ),이지현 ( Ji Hyun Lee ),김미향 ( Mi Hyang Kim ),홍정 ( Jeong Hong ),박은정 ( Eun Jung Park ),이재명 ( Jae Myeong Lee ) 한국정맥경장영양학회 2014 한국정맥경장영양학회지 Vol.6 No.3
Purpose: IV-lipid emulsion can be a nutritional supplement to provide essential fatty acids and energy for patients who need total parenteral nutrition support. The recommended administration dose of lipid emulsion is less than 2.5 g/kg/d and the rate should not exceed 0.15 g/kg/h for adult patients. The purpose of this study is to evaluate the adequacy of the currently prescribed administration rate of IV-lipid emulsion in a single center. Methods: We analyzed 1,739 lipid emulsion administration prescriptions in 1,095 patients over 18 years old at Ajou University Hospital from January 1, 2014 to March 31. Results: The median prescription rate of total lipid emulsion was 0.134 (0.012∼1.125) g/kg/h, and the exceeding portion of maximum recommended infusion rate was 36.9%. The median administration prescription rate of lipid emulsion was faster in 500 mL emulsions, compared to 250 mL emulsion (0.146 g/kg/h vs. 0.075 g/kg/h; P<0.001) and at emergency room (ER), compared to general ward (0.154 g/kg/h vs. 0.123; P<0.001). The exceeding portion of maximum recommended infusion rate of lipid emulsion was also higher in 500 mL emulsion, compared to 250 mL emulsion (52.2% vs. 30.4%; P<0.001) and at ER, compared to general ward (52.1% vs. 30.4%; P<0.001). Triglyceride level was higher in exceeding recommended infusion rate compared to less, but not statistically significant (119 mg/dL vs. 261 mg/dL; P=0.202). Conclusion: Administration prescription rate of lipid emulsion exceeded the recommended rate and this feature was dominant in 500 mL emulsion and at ER. Education and monitoring of lipid emulsion prescription is needed for appropriate lipid administration and prevention of fat overload syndrome.