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축대칭 물체의 경계층 유동소음에 대한 실험적 연구(II) - 전두부 천이제어 및 방사소음 -
이승배,김휘중,권오섭,이상권,Lee, Seung-Bae,Kim, Hooi-Joong,Kwon, O-Sup,Lee, Sang-Kwon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.10
The oscillatory excitation with a Strouhal number of 2.65 ncar the stagnation zone of hemispherical nose model was employed to control the laminar separation bubble and the transition to turbulence. The effects of oscillatory excitation upon the separation bubble and the transition were addressed in terms of kurtosis/skewness and time-frequency analyses. The measured noise spectrum of radiated sound from the turbulent boundary layer on the axi-symmetric infinite cylinder is compared with that by Sevik's wave-number white approximations. The noise sources in TBL on axi-symmetric cylinder and the caling of their far-field sound are also discussed.
Duplex PCR을 이용한 유제품 안에 있는 산양유와 우유의 신속한 동정에 대한 연구
이승배,최석호,Lee, Seung-Bae,Choi, Suk-Ho 한국축산식품학회 2009 한국축산식품학회지 Vol.29 No.5
A duplex PCR technique was applied for specific identification of cow and goat milk in milk products by using primers targeting the mitochondrial 12S rRNA gene. Duplex PCR using primers specific for cow and goat generated specific fragments of 223bp and 326bp from cow and goat milk DNA, respectively. Duplex PCR was applied to 15 milk products purchased from the market to verify label statements. The labeling statements of four market milk products, three yoghurt products, and one whole milk powder product were confirmed in the duplex PCR. The labeling statements of five of seven infant milk powder products were also confirmed by duplex PCR but the other two products were shown to be contaminated with either cow or goat milk. The proposed duplex PCR provides a rapid and sensitive approach to detection of as little as 0.1% cow milk in goat milk and one-step detection of cow or goat milk in milk products.
Birnessite와 Hydroxyapatite에 의한 납과 카드뮴 오염퇴적토의 독성저감 평가
이승배,정재웅,김영진,남경필,Lee, Seung-Bae,Jung, Jae-Woong,Kim, Young-Jin,Nam, Kyoung-Phile 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.4
The success of stabilization treatment in heavy metal contaminated sediment depends on the heavy metal bioavailability reduction through the sequestration of the heavy metals. This study was performed to assess the changes in the bioavailability of Pb or Cd in the Pb or Cd contaminated sediments by using birnessite and hydroxyapatite as stabilizing agents. The toxicity tests were carried out using a microorganism (Vibrio fischeri), an amphipod (Hyalella azteca) and an earthworm (Eisenia foetida). With Vibrio fischeri, the toxicities of both Pb and Cd were reduced by more than ten times in the presence of birnessite and hydroxyapatite compared to that of in the absence of birnessite and hydroxyapatite. The concentrations of Pb and Cd in the contaminated sediments were lethal to Hyalella azteca, however, in the presence of birnessite and hydroxyapatite more than 90%, on average, of Hyalella azteca survived. With Eisenia foetida, the bioaccumulated concentrations of both Pb and Cd were reduced by more than 75%, on average, lower with the addition of birnessite and hydroxyapatite to the contaminated sediments. These results show that the addition of birnessite and hydroxyapatite can reduce the bioavailability of Pb and Cd in contaminated sediments. In addition, the in situ and ex situ performance of birnessite and hydroxyapatite as stabilizing agents can be verified using the toxicity tests with Hyalella azteca and Eisenia foetida, respectively.
축대칭 물체의 경계층 유동소음에 대한 실험적 연구 ( I ) - 축대칭 물체 전두부 및 실린더 벽면 섭동압력 -
이승배,김휘중,권오섭,이상권,Lee, Seung-Bae,Kim, Hooi-Joong,Kwon, O-Sup,Lee, Sang-Kwon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7
The axisymmetric bodies considered in this study have hemispherical and ellipsoidal noses. The near-field pressure fluctuations over each nose model at $Re_D=2.43{\times}10^5$ were investigated in the laminar separation region and developing turbulent boundary layers using a 1/8' pin-holed microphone sensor. The wall pressure fluctuations were also measured in an axisymmetric boundary layer on a cylinder parallel to mean flow at a momentum thickness Reynolds number of 850 and a boundary layer thickness to cylinder radius ratio of 1.88.
사료 첨가용 생균제를 위한 Probiotics 유산간균의 분리 및 동정
이승배,최석호,Lee Seung-Bae,Choi Suk-Ho 한국축산식품학회 2006 한국축산식품학회지 Vol.26 No.1
한우와 홀스타인의 분변으로부터 MRS 배지와 LAPT 배지를 이용하여 무작위 선발법으로 54균주의 유산균을 1차로 분리하였다. 1차로 분리된 54균주에 대해 내담즙성이 우수한 10균주를 분리한 다음 내산성을 조사한 결과 인공위액 pH 2.5에서 LS1, LS15 및 LL6 균주가 각각 66.5%, 82.6% 및 80.7%의 생존율을 나타내었다. Sal. typhimurium, Sta. aureus 및 Cl. perfringens의 병원균에 대해 가장 큰 항균력을 보인 균주는 LL6와 LL7이었다. API CHL kit로 동정한 결과 LS1, LS2 및 LMI 균주는 모두 L. fermentum, LL6와 LL7 균주는 L. acidophilus, LS3 균주는 L. plantarum으로 각각 동정되었고, 나머지 4균주는 Lactobacillus spp. 로 동정되어 분리된 10균주 모두 안전성 있는 유산간균임을 확인하였다. 10종류의 항생제에 대한 내성을 조사한 결과 ampicillin, amoxicillin과 erythromycin에 대해서는 감수성이 있으나 colistin과 ciprofloxacin에 대해 모두 내성을 나타내었다. LB1, LL6 및 LL7 균주는 gentamicin과 neomycin에 대해 내성을 보여 주었다. 분리 동정된 균주 중에 내산성, 내담즙성 및 병원성 균에 대한 특성을 기준으로 판단할 경우 probiotic 유산균으로 사용 가능성이 높은 것은 LL6인 L. acidophilus로 나타났다. Fifty four acid-resistant and bile-resistant isolates of lactic acid bacteria were initially isolated from the faces of Korea native cattle and Holstein using MRS agar and LAPT agar, and ten strains with superior activity against bile salt were finally selected LS1, LS15, and LL6 isolates showed survival of 66.5%, 82.6% and 80.7% against the simulated stomach liquid(pH 2.5), respectively. LL6 and LL7 isolates had the highest inhibitory activities against the pathogenic bacteria such as Salmonella typhimurium, Staphylococcus aureus, and Clostridium perfringens. By using API 50 CHL kit LS1, LS2 and LM1 isolates were identified as a L. fermentum. LL6 and LL7 isolates as a L. acidophilus, and LS3 isolate as a L. plantarum. The other four isolates belong to genus Lactobacillus. All the isolates tested were sensitive to some antibiotics such as ampicillin, amoxicillin and erythromycin, but resistant to colistin and ciprofloxacin. LB1, LL6 and LL7 isolates were resistant to gentamicin and neomycin. Especially, the LL6 isolate showed the highest resistance to both of the simulated stomach liquid and bile salt, in addition to the highest inhibitory activities against Sal. typhimurium, Staph. aureus and Cl. perfringens.
태백산 분지 태백층군에서 산출된 전기 고생대 스타일로포란 극피동물
이승배(Seung-bae Lee),최덕근(Duck K. Choi) 한국고생물학회 2006 고생물학회지 Vol.22 No.2
태백산분지 하부 고생대층에서는 삼엽충, 코노돈트, 완족동물, 두족류, 해면동물, 필석 등 다양한 화석이 산출된다. 이 논문에서는 그동안 우리나라에서 그 존재가 알려지지 않았던 극피동물의 일종인 스타일로포라의 산출을 소개한다. 스타일로포라는 태백층군의 동점층과 두무골층에서 산출되었으며, 동점층에서는 캄브리아기 최후기에 해당하는Sokkaejaecystis serrata Lee et al., 2005, 속명과 종명이 정해지지 않은 form A와 form B 등 3종을 그리고 두무골층에서는 트레마독 후기 화석인 Taebaekocystis cocaban (Kobayashi, 1960), Anatifopsis sp. 그리고 이름을 정하지 못한 많은 표본을 발견하였다. The lower Paleozoic strata of the Taebaeksan Basin have been well known to yield diverse fossils including trilobites, conodonts, brachiopods, molluscs, sponges, graptolites among others. This study reports the occurrence of stylophoran echinoderms from the Dongjeom and Dumugol formations of the Taebaek Group in Korea. The Dongjeom Formation exclusively yields cornute stylophorans such as Sokkaejaecystis serrata Lee et al., 2005 and genus and species indeterminate forms A and B. The Dumugol Formation comprises both cornute and mitrate stylophorans: Taebaekocystis cocaban (Kobayashi, 1960), Anatifopsis sp., and diverse skeletal elements of uncertain affinity.
중소벤처기업 창업자의 사회적 자본이 창업성과에 미치는 영향에 관한 연구: 초기창업자 행동을 매개로
이승배 ( Lee Seung-bae ) 한국경영공학회 2022 한국경영공학회지 Vol.27 No.1
Purpose This study is to analyze the effect of entrepreneur’s social capital, which accumulates through entrepreneur’s external network, trust and shared vision among members of the start-up team on entrepreneurial intention and opportunity recognition at the nascent entrepreneurship stage. Methods For empirical analysis, successful entrepreneurs of smaller ventures were surveyed online A total of 253 samples were obtained and IBM AMOS 20 was used for statistical testing. Results First, external bridging social capital and internal bonding social capital directly influence nascent entrepreneurship, Second, nascent entrepreneur's behaviors directly influences start-up performance, and it is to say that nascent entrepreneur's behaviors, which is a process of entrepreneurial intention and opportunity recognition, influences start-up performance. Third, external bridging and internal bonding social capital have a significant impact on start-up performance mediated by nascent entrepreneur's behaviors. Fourth, analysis of indirect effect of social capital revealed that external bridging social capital not only influences entrepreneurial intention and opportunity recognition but also the start-up performance significantly. Conclusion This study has provided theoretical grounds that support that preliminary or potential entrepreneurs can achieve successful entrepreneurship by recognizing the importance of social capital and overcoming the initial challenges of start-up such as lack of resources and anxiety about failure through strategic allocation of social capital.