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활성탄/폴리우레탄 복합 담체를 충전한 Biofilter에서 기상 Toluene의 제거
이민규 ( Lee Min Gyu ),전평조 ( Jeon Pyeong Jo ),이동환 ( Lee Dong Hwan ),감상규 ( Gam Sang Gyu ) 한국공업화학회 2003 공업화학 Vol.14 No.7
활성탄/폴리우레탄 복합담체를 충전한 바이오필터를 사용하여 기상톨루엔의 처리 실험을 약 120일간 수행하였다. 미생물 균주는 Bacillus sp.를 사용하였다. 톨루엔의 유입 농도 및 공탑접촉시간(EBCT)과 같은 운전인자가 제거효율에 미치는 영향을 검토하였다. 120일 동안 운전 중 바이오필터 컬럼내의 압력손실과 pH의 변화 등을 살펴보았다. 또한, 유입되는 톨루엔 가스, nutrient 및 톨루엔 가스와 nutrient가 동시에 12 h 간격으로 공급/중단되는 경우에 바이오필터의 제거능을 조사하였다. The treatment of toluene vapor was carried out using the biofilter packed with activated carbon/polyurethane composite during 120 days. Bacillus sp. was used as a toluene oxidizer. The effects fo operating conditions such as the influent toluene concentration and the empty bed contact time (EBCT) on the removal efficiency of toluene were investigated. During 1% days operation the pressure drop through the biofilter column and the pH change in the drains water were observed. When toluene vapor, nutricnt, and both toluene vapor and nutrient were supplied and stopped at 12 h interval, the performance of the biofilter was also studied.
Kim Jeon-Ha,Lee Gam-Gyu,Kang Ik-Soo,Kang Myung-Chang,Kim Jeong-Suk Korean Society for Precision Engineering 2006 International Journal of Precision Engineering and Vol.7 No.3
To diagnosis abnormal compressor conditions in an air-conditioner, the acoustic emission (AE) signal, which is derived from wear condition, compressed air, and assembly error, was analyzed experimentally. Burst and continuous type AE signals resulted from metal contact and compressed air, and the raw AE signal of compressors was acquired in the production line. After extracting samples using waveforms, the Early Life Test (ELT) was conducted and the waveform was classified as normal or abnormal. Efficient parameters in the waveform pattern were investigated in time and frequency domains and a diagnosis algorithm for air-conditioners using Neural Network estimation is suggested.
Jeon-Ha Kim,Gam-Gyu Lee,Ik-Soo Kang,Myung-Chang Kang,Jeong-Suk Kim 한국정밀공학회 2006 International Journal of Precision Engineering and Vol.7 No.3
To diagnosis abnormal compressor conditions in an air-conditioner, the acoustic emission (AE) signal, which is derived from wear condition, compressed air, and assembly error, was analyzed experimentally. Burst and continuous type AE signals resulted from metal contact and compressed air, and the raw AE signal of compressors was acquired in the production line. After extracting samples using wave forms, the Early Life Test (ELT) was conducted and the waveform was classified as normal or abnormal. Efficient parameters in the waveform pattern were investigated in time and frequency domains and a diagnosis algorithm for air-conditioners using Neural Network estimation is suggested.
송희선,이상귀,윤용주,홍기환,최현규,신감진,권삼현 대한마취과학회 1991 Korean Journal of Anesthesiology Vol.24 No.6
N₂O can diffuse in and/or out the middle ear cavities and it may alter the middle ear pres-sure. This study was performed to investigate the effect of N₂O discontinuation on the changes in middle ear pressure during general endotracheal anesthesia. We measured middle ear pres-sures and end-tidal NO concentrations at preanesthesia, immediately after N₂O discontinuation and then at every five minutes for 60 minutes under either halothane or enflurane an- esthesia in two groups(group 1=50% administration of N₂O in O₂; group 2=60% administration of N₂O in O₂). The middle ear pressures after N₂O discontinuation decreased slowly but they did not returned to the preanesthetic value in both groups. The end-tidal N₂O concentrations decreased rapidly until five minutes and then they decresed slowly to the zero leve1 until 30 minutes after N₂O discontinuation in both groups. The expected time of the middle ear pres-sure of preanesthesia value was 89.4 minutes in group 1 and 80.9 minutes in group 2 respectively. The middle ear pressure do not return to the level of preanesthesia at 60 minutes after N₂O discontinuation while the end-tidal N₂O concentration decrease to the zero level via 30 minutes after its discontinuation. Thus it is recommended that N₂O administration should be discontinued at least 30 minutes before an application of tympanic membrane patch on the ear drum and N₂O is carefully administered in patients with middle ear and/or upper airway disesses.
Epinephrine 과 Clonidine 에 의한 T-Cain 척수마취의 연장 효과
송희선,한영진,이상귀,최현규,신감진 대한마취과학회 1991 Korean Journal of Anesthesiology Vol.24 No.3
Vasoconstrictors such as epinephrine or phenylephrine have been used as an adjunct to local anesthetics to prolong the duration of spinal anesthesia. Recently, clonidine, an areceptor agonist, has been proved to have analgesic effect and to prolong epidural and spinal anesthesia. We used 0.3mg of epinephrine, 75 μg and 150 μg of clonidine in spinal anesthesia with 12 mg of T-Cain respectively and compared hemodynamic and analgesic effects of each drug. Heart rate and blood pressure were checked before, during and after anesthesia. Sensory level was checked by pin-prick method and motor blockade was measured by Bromages scale. The results were as follows. 1) Heart rate changed little in the epinephrine group and decreased significantly in all other groups. 2) Systolic blood pressure decreased significantly in all groups except the epinephrine group. Both 75 μg and 150 μg of clonidine caused a significant fall in diastolic pressure. 3) The onset time for sensory and motor blockade varied little among all gro 4) Sensory blockade was significantly higher in the 150 μg of clonidine group than the control group. Time to achieve the maximum level of sensory blockade was significantly faster in control group than 150 μg of clonidine group. 5) The duration of sensory and motor blockade was significantly prolonged in epinephrine and clonidine group than control group. The results indicate that clonidine, when used as an adjunct to T-Cain spinal anesthesia, is as effective as epinephrine in prolongation of motor and sensory blockade.