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이봉훈,하영숙,Lee, Bong Hun,Ha, Young Sook 대한화학회 1999 대한화학회지 Vol.43 No.2
4종의 중학교 과학 교과서의 화학 단원을 중심으로 이에 수록된 탐구 활동의 내용을 교과서 및 학년별로 비교, 분석하였다. 과학 교과서의 단원별 쪽수와 비율 분석 결과, 전체 평균 290.2쪽에서 화학 분야가 차지하는 쪽수는 64.8쪽(22.3%)으로 과학 4개 분야 중 최소를 나타내었고 화학 분야의 총 탐구 활동 수 171회중 1학년은 59회, 2학년은 47회, 3학년은 65회이었으며, 탐구 활동 중 관찰 수가 29회, 측정 수가 20회, 실험수가 113회, 자료 해석 수가 9회, 조사 및 토의 수는 0회로 탐구 활동 중 실험 활동이 66.7%나 되어 화학 분야의 탐구 활동이 실험 활동에만 치우쳐 있으므로 이를 개선할 필요가 있으리라 생각되었다. The inquiry activities closely related to chemistry which were presented in the 4 middle school science textbooks were compared and analyzed. The total volume of chemistry part was 64.8 pages (22.3%), which were the smallest one in the four categories of science. The total numbers of inquiry activities related to chemistry were 171; 59 for the first grade, 47 for the second, and 65 for the third grade and those were composed of 29 observations, 20 measurements, 113 experiments, 9 data explanations, no investigation and discussion. Therefore, the major inquiry activity was experiment (66.7%) and this maldistribution will need to be improved.
A12024-T4의 프레팅 피로균열거동에 관한 실험적 연구
이봉훈,이순복,Lee, Bong-Hun,Lee, Sun-Bok 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.3
The technique of fretting fatigue test was developed and fretting fatigue tests of A12024-T4 were conducted under several conditions. The newly developed calibration methods for measuring surface contact tractions showed good linearity and repeatability. The plate type specimen to which tow bridge type pads were attached and vision system was used to observe the crack behaviour. The oblieque cracks appeared in the early stage of crack growth and they became mode I cracks as they grow about 1 mm. The mode I transition points were found to be longer when surface tractions are higher or bulk stress is lower. Before the crack becomes mode I crack, 'well point' where crack grow about rate is minimum, was detected under every experimental condition. The crack behaviour was found to be affected by surface tractions, contact area, bulk stress. It was also found that partial slip and stick condition is most detrimental and the crack starts from the boundary of stick and slip. For gross slip crack started at the outside edge of pad. After crack mode transition, fretting fatigue cracks showed almost same behaviour of plain mode I fatigue cracks. Equivalent stress intensity factor was used to analyze the behaviour of fretting fatigue cracks and it was found that stress intensity factors can be applied to fretting fatigue cracks.
박현,이봉훈,박원철,Park, Hyun,Lee, Bong-Hun,Bak, Won-Chull 한국버섯학회 2005 한국버섯학회지 Vol.3 No.2
차가는 배양균사로부터 위염, 위궤양 및 여러 가지 암에 효력을 나타내는 것으로 알려진 베풍긴(befungin) 약제의 생산을 위하여 사용되고 있다. 차가는 자작나무 줄기에서 주로 생산되는 것으로 알려져 있는데, 우리나라의 경우 자작나무 자생지는 해발고도 1,100m 이상에만 나타난다. 하지만, 우리는 점봉산의 거제수나무에서 차가버섯을 채집할 수 있었으며, 스트렙토마이신을 첨가한 PDA 배지를 이용하여 균주를 분리할 수 있었다. 차가 균은 5개 부위 중 차가 균으로 만연된 나무조직에서 분리될 뿐 다른 부분에서는 분리가 어려웠다. 균핵에서 확인한 포자는 $6.0{\sim}10.0{\times}4.5{\sim}6.0{\mu}m$ 크기를 나타내었고, 균사 굵기는 $2.5{\sim}5.0{\mu}m$ 이었다. 실내 배양에서 균총은 불규칙한 모양을 띄며, 시간이 경과할수록 균총의 중간 중간이 노란색으로 변색되었다. 약 20일이 경과하면 노란색으로 변색된 부분에서 적갈색의 강모(setae)를 확인할 수 있으며, 강모의 크기는 $4{\sim}6{\times}100{\sim}420{\mu}m$ 이었다. 차가의 균사생장에 가장 좋은 배지는 OA(oatmeal agar)이었다. 적합한 온도 범위는 $25{\sim}30^{\circ}C$이었으며, 균사생장에 적합한 pH는 8.0~9.5로 비교적 높은 산도를 좋아하는 것으로 나타났다. The sterile form of Inonotus obliquus is used for preparation of the medicine befungin that is effective in the treatment of gastritis, gastric ulcers, and several tumors. The fungus is known to be produced mainly on the stems of Betula platyphylla var. japonica that grows at high altitudinal (above 1,100 m) region in Korea. But, we found the mushroom on the stem of Betula costata at Mt. Jumbong in Korea. We isolated a pure culture of the fungus from the stem of B. costata by use of potato dextrose agar (PDA) medium with streptomycin. We could isolate the fungus from plant's tissue filled with hyphae, but not from other parts. The spore collected from the sclerotia showed $6.0{\sim}10.0{\times}4.5{\sim}6.0{\mu}m$ in diameter, and the hypha was $2.5{\sim}5.0{\mu}m$ in thickness. The colony showed irregular features and scattered yellow color at the center as the culture ages. We could find brownish setae at the yellow region of colony at 20 days of culture, and the size ranged $4{\sim}6{\times}100{\sim}420{\mu}m$. The oatmeal agar (OA) provided best growth for I. obliquus among five media (CDA, CMA, MA, OA and PDA). Optimum temperature ranged $25{\sim}30^{\circ}C$, and optimum pH was relatively alkaline with the range of pH 8.0~9.5.