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강섬유를 사용한 철근콘크리트 보-기둥 접합부의 내진 성능
허민욱(Heo Min-Wook),김우석(Kim Woo-Suk),권우현(Kwon Woo-Hyun),김성기(Kim Sung-Ki),신종학(Shin Jong-Hack),곽윤근(Kwak Yoon-Keun) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
This paper deals with the earthquake-resistant capacity of reinforced concrete beam-column joints with steel fiber. Eight beam-column joint specimens (including control specimen) were experimentally evaluated to determine improvements in earthquake-resistant capacity. Test parameters in this experimental study are concrete compressive strength (24, 59 MPa) and volume ratio of steel fiber (0, 0.3, 0.6, 1%). RC beam-column joint specimens were tested under reversed lateral cyclic load. Considering concrete compressive strength and volume ratio of steel fiber, maximum strength, initial stiffness, shear strength and energy dissipation capacity of test specimens were evaluated. The results show that the earthquake-resistant capacity of specimens with steel fiber improve than that of specimen without steel fiber. and we did compare experiment results with ACI352R-02 and Tang`s equation.
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김근욱,이경석,윤석만,도재원,배학근,윤일규,최순관,변박장,Kim, Keun-Wook,Lee, Kyeong-Seok,Yoon, Suk-Man,Doh, Jae-Won,Bae, Hack-Gun,Yun, Il-Gyu,Choi, Soon-Gwan,Byun, Bark-Jang 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.2
Objectives : Head injury is one of the common causes of death in the industrialized countries, and it is a common cause of subarachnoid hemorrhage. Recently, traumatic subarachnoid hemorrhage(TSAH) has been considered as a major prognostic factor. Some suggested that a certain vasodilating agent may be effective to treat or prevent the secondary brain injury due to vasospasm from TSAH. The role of TSAH is not yet fully solved. The prognosis and clinical significance of the TSAH was evaluated. Methods : A retrospective study was performed. A total of 573 consecutive patients with head injury admitted to our institute from January 1996 to December 1997 were examined with respect to outcome and clinical features. In all patients, computerized tomographic scanning was done within 2 days after the injury. Results : TSAH was found in 68 patients(11.9%). The outcome at discharge of the patients without TSAH was favorable(good recovery and moderate disability) in 84.8%, unfavorable(severe disability and vegetative state) in 8.6%, and the mortality rate 6.7%. However, the outcome was favorable in 51.5%, unfavorable in 20.6%, and the mortality rate 27.9% in patients with TSAH. Although the outcome of the patients with thick TSAH was worse than that of the patients with scanty TSAH, the difference was not statistically significant. The difference of the outcome in patients with TSAH according to the location also lacked statistical significance. TSAH was more common in patients with age of 40 years or more, and patients with low Glasgow coma scores. Patients with TSAH had abnormal pupillary responses, diffuse axonal injuries, intubations and operative interventions more frequently than patients without TSAH. Conclusion : These results strongly suggest that the TSAH per se did not worsen the prognosis. However, it represented the injury to be more severe.
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탈질능을 가진 Pseudoomonas sp.의 분리 및 특성
김현국,김성구,이병헌,서근학,공인수,Kim, Hyun-Kuk,Kim, Sung-Koo,Lee, Byung-Hun,Suk, Keun-Hack,Kong, In-Soo 한국생명과학회 1998 생명과학회지 Vol.8 No.1
양어장에서 어류의 배설물이나 사료에 의해 생성된 암모니아성 질소 제거를 위한 수처리 공법의 하나로써 질산화 세균 및 탈질화 세균을 고정화 방법의 개잘리 필요한 실정이다. 이를 위해서는 우수한 고정화 방법의 개발이 필요한 실정이다. 이를 위해서는 우수한 질산능과 탈질능을 가지는 미생물의 분리가 선행되어야 하므로 denitifier consortium으로부터 여러 균주를 선별, 동정하여 이를 Pseudomonas sp. KH2-2으로 명명하였다. 분리된 균의 탈질능은 최적의 생육을 보일 때 가장 강하게 나타났다. $30{\circ}C보다는 40{\circ}C$에서 배양하였을 때 최적의 성장을 보여주었고, 탈질능도 현저히 높았다. pH에 있어서는 pH7에서 가장 강한 탈질능을 나타내었다. pH5에서는 균의 성장이 이루어지지 않았고 pH9에서는 $NO_3$^-환원능은 높았으나 $NO_2$^-환원능은 낮았다. Pseudomonas sp. KH2-2 had the denitrifying ability adn was isolated from the denitrifier consortium in order to remove nitrogen compounds from waste water in aquaculture system. When this strain was reached stationary phase, it has the maxium denitrification activity. Denitrification activity of the isolated strain was shown the growth associated pattern. Optimal temperature for cell growth and denitrification activity was 40$\circ$C and optimal pH was 7.
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