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리튬이차전지용 Li1.05CoO2 음극재료의 전기화학적 특성 연구
김정식,우선기,류호진,이학로,김인석 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.7
A Li_(1.05)CoO₂ powder has been prepared by the solid state reaction of Li₂CO₃ and Co₃O₄ at 1000℃. Li_(1.05)CoO₂ powder was characterized a layered structure with space group of R3 ̄m by XRD analysis. But Li_(1.05)CoO₂ has a shorter c-axis than LiCoO₂ because, in the former case, a coulombic interaction is more dominent than elastic strain energy effect. In this experiment, electrochemical properties about porous Li_(1.05)CoO₂ were investigated by galvanostatic, CV(Cyclic Voltammetry) and GITT(Galvanostatic Intermittent Transient Technique) method.
이성호,김광락,안도희,이한수,정흥석,강희석,백승우 한국공업화학회 1999 응용화학 Vol.3 No.2
A hydrogen absorption apparatus was installed for the experiment of hydrogen absorption as a basic procedure for the tritium immobilization. The basic experiment on the hydrogen absorption was conducted by using the zircaloy scrap and the sponge. The surface of the zircaloy scrap was activated and the equilibrium time on hydrogen absorption was determined. Morphology change of the zircaloy scrap was observed according to the progress of activation. The value of H/M measured under the hydrogen condition of 46 atm showed about 2.04 at 600℃ in case of the zircaloy scrap and about 2.01 at 400℃ in case of the zirconium sponge, respectively. These values were maximum allowable hydrogen storage capacity in zirconium.
기체 크로마토그래피를 이용한 수소동위원소 혼합물의 분리 특성
이성호,김광락,안도희,이한수,유재형,정흥석,강희석,백승우 한국공업화학회 1999 응용화학 Vol.3 No.2
Gas chromatography has been used as one of the practical methods for separation and enrichment of hydrogen isotopes in filds of operation or handling a hydorgen isotope facility. Chromatographic separation experiments of a mixture of hydorgen isotopes including with hydorgen, hydrogen deutride and deuterium. The complete separation of hydrogen isotopes was observed with an alumina adsorbent partially deactivated by coating with 10% manganese chloride(MnCl₂).
수소동위원소 교환반응 촉매 지지체의 경도에 대한 용매의 효과
이성호,김광락,안도희,이한수,정흥석,강희석,백승우,최희주 한국공업화학회 2000 응용화학 Vol.4 No.1
Polymeric catalyst supports for hydrogen isotope exchange reaction were prepared by using the various good and poor solvents. Effect of solvent was investigated experimentally on the hardness of these polymeric supports. P55OE1 showed the highest hardness and low ratio of micro pore area to total pore area. P55TE2 showed high hardness and ratio of micro pore area to total pore area. Therefore P55TE2 was expected to be the best polymeric support with regard to the performance and the hardness of the catalyst.
이성호,김광락,안도희,유재형,백승우,손종식,임성팔,정홍석 한국공업화학회 2001 응용화학 Vol.5 No.2
Hydrogen absorption experiments were carried out by the titanium(Ti) sponge for investigating the characteristics of hydrogen absorption. From experimental results, Ti sponges showed the high hydrogen absorption capacity inspite of low reaction temperature. The H/M which mean the capacity of hydrogen absorption was measured 2.0 for Ti sponge in the experimental condition of 25℃. The effects of the reaction temperature, activation conditions, and the presence of helium in the hydrogen were investigated.
경막외마취 확산의 비교관찰 제 1 보 Bupivacaine-Lidocaine
김영석,김완식,김인규,김흥대,안기량,김교상 대한마취과학회 1980 Korean Journal of Anesthesiology Vol.13 No.1
Epidural anesthesia is widely practiced for lower abdominal operation and delivery in many hospital and its complication in minimal compared with spinal anesthesia. Lidocaine has been used extensively for epidural anesthesia with very satisfactory results. It has a very rapid onset of action, producing complete analgesia and has a reasonable duration of action(about 1-1½hr). A concentration of 1. 5% lidocaine causes effective sensory and autonomic blockade but it is unlikely to produce motor paralysis. More recently, bupivacaine(0.5%) has tended to supplement lidocaine as the drug of choice of epidural anesthesia. Firstly, the duration of action is longer. Secondly, it has better affinity for the tissue so that less will be absorbed into the circulation, thus reducing the risk of a toxic reaction. Thirdly, when used with a continuous technique, there is much chance of tachyphylaxis. Using a standardized anesthesia technic, we compared level of sensory anesthesia with a 0. 5% bupivacaine and 1. 5% lidocaine uder elective and emergency surgery. When equal volume of local anesthetic solution were injected(20 ml of 0.5% bupivacaine and l. 5% lidocaine) there were no statistically significant differences in sensory level in bupivacaine and lidocaine, but the duration of anesthesia in bupivacaine from 2 to 3 times longer than lidocaine.
김완식,박동호,황영희,김흥대,안기량,석민호,김지영,장경덕,서병태 대한마취과학회 1982 Korean Journal of Anesthesiology Vol.15 No.1
Midazolam maleate, a water soluble banzodiazepine unlike diazepam, was synthetized by Walser and Fryer in 1975. In order to ealuate the effectiveness as an induction agent for general anesthesia, 22 elective surgical patients belonging to ASA classification 1 and 2 were selected. And ten patients (male 7, female 3, average 33.5 years old) were induced with midazolam maleate 0.2mg/kg and twelve patients (mdale 7, female 5, average 32.5 years old) with diazepam 0.3mg/kg. The results were summarized as follows. 1) Anesthesia was induced in all of midazolam group by one intravenous injection, but only 6 patients of diazepam group could induced by one injection and the other 6 patients needed 2 or more injections. 2) The changes of blood pressure and pulse rate after induction and intubation were almost similar in the two groups, but greater individual variation was seen in diazepam group. 3) A buring sensation following intravenous injection was noted in 11 cases of diazepam group, but none in midazolam group and no phlebitis in either group. From the above results, diazepam and midazolam are almost similar in nature but midazolam is definitely effective as an induction agent and has less side effects. Therefore midazolam maleate is regarded as a more effective agent than diazepam as an induction for general anesthesia.
유동층 연소로 안전조업을 위한 진동 공급기내의 고체입자 혼합특성에 관한 연구
김미영,조병렬,박상찬,이동규,김의식 한국산업안전학회 1998 한국안전학회지 Vol.13 No.3
This work has been carried out to study the mixing characteristics of solid in vibrating feeder for stable operations of fluidized bed combustion. The system consisted of two particles such that fine particles were located on the top of the coarse particles before vibratory mixing had started. Effect of particle size, particle densities, vibration amplitude and vibration frequency were experimentally obtained. Also, a diffusion model was applied in interpreting the experimental results. From these results, the following empirical equation for the diffusivity was obtained. 수식
건축현장작업의 Human Factors 적용에 관한 연구
김상렬,박일철,박종권,박종근,이영섭 한국산업안전학회 1998 한국안전학회지 Vol.13 No.1
In current domestic constriction field, several factors influencing the safety for field workers are various due to the size and complexity of construction works involved. Among the factors, the age is the important one, because the average age of workers is getting older due to the 3D phenomena in construction fields. The safety for workers of all ages is important, but especially safety for the old, is more important. Thus, the fundamental techniques for placement of field workers with adequate safety corresponding to complexity and hard works are investigated through analyzing fatigue and heart rate of individual worker, especially for the old.
김병호,권상운,정경채,김광락,황성태 한국산업안전학회 1998 한국안전학회지 Vol.13 No.3
Analysis on the study for the sodium fire mitigation was carried out using the CONTAIN-LMR code. Sodium loop building was partitioned into the many cells, in which the safety venting systems were installed for the purpose of improving the sodium fire safety and minimizing its effect on the sodium loop building. The effects of sodium fire on sodium loop building partitioned into the many cells and not partitioned were investigated. The peak pressure and temperature of each cell accompanied by sodium fire in sodium loop building partitioned were lower than those of sodium loop building not partitioned. In the case of partitioning sodium loop building, the pressures, temperatures and aerosols into cells were transferred through propagation path of CONTAIN-LMR sodium fire model simulated by this study, and the effect of sodium spray fire on sodium loop building was mitigated by partitioning building. In addition, the excessive rise of pressure into cells was prevented by installing the over-pressure exhaust valve and under-pressure exhaust valve on the flow path between cells.