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Im Gyu Byun 한국환경과학회 2012 한국환경과학회지 Vol.21 No.12
The ion selective microelectrodes (ISME) have been applied to observe the continuous profiles of NO3 N and NH4 N in bulk solutions or biofilms. In order to evaluate the performance and applicability of ion concentration measuring system, the characteristics, such as slope of calibration curve, detection limit and potentiometric selectivity coefficient were investigated. The slopes of calibration curve showed high degree of correspondence for each target ion concentrations. And the detection limits of nitrate and ammonia ion selective microelectrode were 10 4.7 M and 10 4.4 M, respectively. These ion selective microelectrodes were proved that their own performance could be maintained for 16 days after making. NO3 N and NH4 N selective microelectrodes were also adapted to detect the continuous ion profiles of cilia media packed MLE (Modified Ludzack Ettinger) process. And the monitored nitrate and ammonia ion profiles with the ion selective microelectrode were stable and well corresponded to the results with conventional ion chromatograph. However, the electric potential was unstable until 8 hr because of the unknown noise. The tip shape and performance of the ion selective microelectrode was stably kept over 2 days continuous monitoring.
음폐수의 중온 및 고온 산발효에서 초기 pH가 VFAs 생성에 미치는 영향
변임규 ( Im Gyu Byun ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.10
Batch cultivations were performed to evaluate the influences of the initial pH condition on mesophilic and thermophilic acidogenic fermentation with food waste recycling wastewater. In both conditions of mesophilic and thermophilic fermentation, TVFAs production rates were maximized at the initial pH 7 condition as 0.15 and 0.23 g TVFAs/L?hr, respectively. And pH was also maintained stably between 6 and 7 during 72hr acidogenic cultivation at both conditions. However, predominant VFA components were different according to reaction temperature conditions. In mesophilic condition, propionic acid which has low conversion efficiency to methane was accumulated up to 1,348 mg/L while acetic and butyric acid were predominant in thermophilic condition. Therefore, thermophilic acidogenic fermentation was superior for the effective VFAs production than mesophilic condition. From the DGGE analysis, the band patterns were different according to the initial pH conditions but the correlations of the each band were increased in similar pH conditions. These results mean that microbial communities were certainly affected by the initial pH condition. Consequently, the adjustment of the initial pH to neutral region and thermophilic operation are needed to enhance acidogenic fermentation of food waste recycling wastewater.
임수빈,윤일규,이경석,배학근,변박장 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.9
The author investigated whether there were clear seasonal variations in the incidence of both spontaneous intracerebral hemorrhages(SICH) and subarachnoid hemorrhage(SSAH), and which climatic factor affected on the occurrence rate. From January 1988 to December 1994, 787 patients with SICHs and 556 patients with SSAHs were admitted to our hospital. The author compared the occurrence rate of spontaneous cerebral hemorrhages and the meteorological data on each date, such as daily temperatures(average, maximum, and minimum), temperature change(intradiurnal and daily), precipitation, average wind speed, average relative humidity, duration of sunshine, mean sea level barometric pressure, daily barometric pressure difference and wind-chilling effect. There was a clear seasonal variation in the occurrence rate of SICHs. It was high in early spring(February, March, and Aprll) and early winter(October and December)(P<0.05). In SSAHs, there was no statistically significant differences in the occurrence rate, however. Daily temperatures(average, maximum, and minimum) and mean sea-level barometric pressure were the important climatic factors influencing the occurrence rate of SICHs(P<0.05). The lower daily temperatures(average, maximum, and minimum), and the higher mean sea-level barometric pressure, the more SICHs occurred. In SSAHs, daily average temperature and intradiurnal temperature affected on the occurrence rate(P<0.05), however, there was no climatic factors with a statistically significant correlation. These results suggested that SSAHs differed from SICHs in its pathogenic mechanism. In any events, the dry(high barometric pressure)and cold(low temperature) weather might be a risk factor for the hypertensive patients. To reduce or prevent SICHs, such a hypertensive patient should not go out in dry and cold weather.
신경학적 손상이 없는 흉추의 전위골절 2예 : 증례보고 Report of Two Cases
임수빈,도재원,배학근,이경석,윤일규,변박장 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.1
This is a report of two cases of thoracic spine fracture-dislocation without consequential neurological deficit in each case, the disruption between vertebral body and the posterior column renders spontaneous decompression of the spinal canal as a result of anatomical peculiarity of the thoracic spine such anatomical peculiarity explains the preservation of neurologic function. Diagnosis and management should be carried out with great care in such cases. The two patients underwent posterior approach with instrumentation and eventually recovered without any evidence of neurologic sequelae.
Park, Jeung-Jin,Byun, Im-Gyu,Park, So-Ra,Lee, Jae-Ho,Park, Seung-Han,Park, Tae-Joo,Lee, Tae-Ho Elsevier 2009 Journal of industrial and engineering chemistry Vol.15 No.3
<P><B>Abstract</B></P><P>Caustic is utilized in petrochemical plants for the removal of hydrogen sulfide (H<SUB>2</SUB>S) from a variety of hydrocarbon streams. Because spent sulfidic caustic (SSC) harbors a high level of H<SUB>2</SUB>S and high alkalinity, it was injected into the anoxic zones of the biological nitrogen removal process as the electron donor and buffering agent for sulfur-based autotrophic denitrificaton. In order to determine the optimal SSC dosage, a modified Ludzack–Ettinger (MLE) process was first conducted at laboratory scale. As the result of the lab-scale experiments, the chemical oxygen demand (COD) increment of effluent and nitrification failure were observed, because SSC harbors barely biodegradable matter, and the caustic content was high, in accordance with the requirements. Thus, during the pilot-scale experiments, a hybrid Bardenpho process was designed and the SSC was neutralized from pH 13.3 to 11.5. These strategies were successful because no COD increment of effluent was observed and the pH of the unit process was stable. The heterotrophic and autotrophic denitrification ratios at each condition were calculated and, as the end product of sulfur-based autotrophic denitrification, the sulfate concentration was monitored.</P>